channel layer cleanup: merge header files and split .c files

19 files changed, 3219 insertions, 3111 deletions

diff --git a/usr.bin/ssh/auth-options.c b/usr.bin/ssh/auth-options.c
index 443f5414ad1..d6258ab1ad1 100644
--- a/usr.bin/ssh/auth-options.c
+++ b/usr.bin/ssh/auth-options.c
@@ -10,14 +10,14 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: auth-options.c,v 1.16 2001/03/18 12:07:52 markus Exp $");
+RCSID("$OpenBSD: auth-options.c,v 1.17 2001/05/30 12:55:06 markus Exp $");
 
 #include "packet.h"
 #include "xmalloc.h"
 #include "match.h"
 #include "log.h"
 #include "canohost.h"
-#include "channels.h"
+#include "channel.h"
 #include "auth-options.h"
 #include "servconf.h"
 
diff --git a/usr.bin/ssh/auth2.c b/usr.bin/ssh/auth2.c
index abfe0325ecd..8a011e5e5f4 100644
--- a/usr.bin/ssh/auth2.c
+++ b/usr.bin/ssh/auth2.c
@@ -23,7 +23,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: auth2.c,v 1.58 2001/05/20 17:20:35 markus Exp $");
+RCSID("$OpenBSD: auth2.c,v 1.59 2001/05/30 12:55:06 markus Exp $");
 
 #include <openssl/evp.h>
 
@@ -36,7 +36,7 @@ RCSID("$OpenBSD: auth2.c,v 1.58 2001/05/20 17:20:35 markus Exp $");
 #include "log.h"
 #include "servconf.h"
 #include "compat.h"
-#include "channels.h"
+#include "channel.h"
 #include "bufaux.h"
 #include "auth.h"
 #include "session.h"
diff --git a/usr.bin/ssh/channel-auth.c b/usr.bin/ssh/channel-auth.c
new file mode 100644
index 00000000000..f9079735647
--- /dev/null
+++ b/usr.bin/ssh/channel-auth.c
@@ -0,0 +1,212 @@
+/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ *                    All rights reserved
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose.  Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ *
+ *
+ * Copyright (c) 2001 Markus Friedl.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "includes.h"
+RCSID("$OpenBSD: channel-auth.c,v 1.1 2001/05/30 12:55:07 markus Exp $");
+
+#include "ssh1.h"
+#include "packet.h"
+#include "xmalloc.h"
+#include "log.h"
+#include "channel.h"
+#include "key.h"
+#include "authfd.h"
+#include "uidswap.h"
+
+
+/* Name and directory of socket for authentication agent forwarding. */
+static char *auth_sock_name = NULL;
+static char *auth_sock_dir = NULL;
+
+/* Sends a message to the server to request authentication fd forwarding. */
+
+void
+auth_request_forwarding()
+{
+	packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
+	packet_send();
+	packet_write_wait();
+}
+
+/*
+ * Returns the name of the forwarded authentication socket.  Returns NULL if
+ * there is no forwarded authentication socket.  The returned value points to
+ * a static buffer.
+ */
+
+char *
+auth_get_socket_name()
+{
+	return auth_sock_name;
+}
+
+/* removes the agent forwarding socket */
+
+void
+cleanup_socket(void)
+{
+	unlink(auth_sock_name);
+	rmdir(auth_sock_dir);
+}
+
+/*
+ * This is called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server.
+ * This starts forwarding authentication requests.
+ */
+
+int
+auth_input_request_forwarding(struct passwd * pw)
+{
+	Channel *nc;
+	int sock;
+	struct sockaddr_un sunaddr;
+
+	if (auth_get_socket_name() != NULL) {
+		error("authentication forwarding requested twice.");
+		return 0;
+	}
+
+	/* Temporarily drop privileged uid for mkdir/bind. */
+	temporarily_use_uid(pw);
+
+	/* Allocate a buffer for the socket name, and format the name. */
+	auth_sock_name = xmalloc(MAXPATHLEN);
+	auth_sock_dir = xmalloc(MAXPATHLEN);
+	strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
+
+	/* Create private directory for socket */
+	if (mkdtemp(auth_sock_dir) == NULL) {
+		packet_send_debug("Agent forwarding disabled: "
+		    "mkdtemp() failed: %.100s", strerror(errno));
+		restore_uid();
+		xfree(auth_sock_name);
+		xfree(auth_sock_dir);
+		auth_sock_name = NULL;
+		auth_sock_dir = NULL;
+		return 0;
+	}
+	snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%d",
+		 auth_sock_dir, (int) getpid());
+
+	if (atexit(cleanup_socket) < 0) {
+		int saved = errno;
+		cleanup_socket();
+		packet_disconnect("socket: %.100s", strerror(saved));
+	}
+	/* Create the socket. */
+	sock = socket(AF_UNIX, SOCK_STREAM, 0);
+	if (sock < 0)
+		packet_disconnect("socket: %.100s", strerror(errno));
+
+	/* Bind it to the name. */
+	memset(&sunaddr, 0, sizeof(sunaddr));
+	sunaddr.sun_family = AF_UNIX;
+	strncpy(sunaddr.sun_path, auth_sock_name,
+		sizeof(sunaddr.sun_path));
+
+	if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0)
+		packet_disconnect("bind: %.100s", strerror(errno));
+
+	/* Restore the privileged uid. */
+	restore_uid();
+
+	/* Start listening on the socket. */
+	if (listen(sock, 5) < 0)
+		packet_disconnect("listen: %.100s", strerror(errno));
+
+	/* Allocate a channel for the authentication agent socket. */
+	nc = channel_new("auth socket",
+	    SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
+	    CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
+	    0, xstrdup("auth socket"), 1);
+	if (nc == NULL) {
+		error("auth_input_request_forwarding: channel_new failed");
+		close(sock);
+		return 0;
+	}
+	strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
+	return 1;
+}
+
+/* This is called to process an SSH_SMSG_AGENT_OPEN message. */
+
+void
+auth_input_open_request(int type, int plen, void *ctxt)
+{
+	Channel *c = NULL;
+	int remote_id, sock;
+	char *name;
+
+	packet_integrity_check(plen, 4, type);
+
+	/* Read the remote channel number from the message. */
+	remote_id = packet_get_int();
+
+	/*
+	 * Get a connection to the local authentication agent (this may again
+	 * get forwarded).
+	 */
+	sock = ssh_get_authentication_socket();
+
+	/*
+	 * If we could not connect the agent, send an error message back to
+	 * the server. This should never happen unless the agent dies,
+	 * because authentication forwarding is only enabled if we have an
+	 * agent.
+	 */
+	if (sock >= 0) {
+		name = xstrdup("authentication agent connection");
+		c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
+		    -1, 0, 0, 0, name, 1);
+		if (c == NULL) {
+			error("auth_input_open_request: channel_new failed");
+			xfree(name);
+			close(sock);
+		} else {
+			c->remote_id = remote_id;
+		}
+	}
+	if (c == NULL) {
+		packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
+		packet_put_int(remote_id);
+	} else {
+		/* Send a confirmation to the remote host. */
+		debug("Forwarding authentication connection.");
+		packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
+		packet_put_int(remote_id);
+		packet_put_int(c->self);
+	}
+	packet_send();
+}
diff --git a/usr.bin/ssh/nchan.c b/usr.bin/ssh/channel-close.c
index bb349ebb50a..eb978791d7b 100644
--- a/usr.bin/ssh/nchan.c
+++ b/usr.bin/ssh/channel-close.c
@@ -23,17 +23,42 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: nchan.c,v 1.26 2001/05/28 23:14:49 markus Exp $");
+RCSID("$OpenBSD: channel-close.c,v 1.1 2001/05/30 12:55:07 markus Exp $");
 
 #include "ssh1.h"
 #include "ssh2.h"
 #include "buffer.h"
 #include "packet.h"
-#include "channels.h"
-#include "nchan.h"
+#include "channel.h"
 #include "compat.h"
 #include "log.h"
 
+/*
+ * SSH Protocol 1.5 aka New Channel Protocol
+ * Thanks to Martina, Axel and everyone who left Erlangen, leaving me bored.
+ * Written by Markus Friedl in October 1999
+ *
+ * Protocol versions 1.3 and 1.5 differ in the handshake protocol used for the
+ * tear down of channels:
+ *
+ * 1.3:	strict request-ack-protocol:
+ * 	CLOSE	->
+ * 		<-  CLOSE_CONFIRM
+ *
+ * 1.5:	uses variations of:
+ * 	IEOF	->
+ * 		<-  OCLOSE
+ * 		<-  IEOF
+ * 	OCLOSE	->
+ * 	i.e. both sides have to close the channel
+ *
+ * 2.0: the EOF messages are optional
+ *
+ * See the debugging output from 'ssh -v' and 'sshd -d' of
+ * ssh-1.2.27 as an example.
+ *
+ */
+
 /* functions manipulating channel states */
 /*
  * EVENTS update channel input/output states execute ACTIONS
@@ -84,7 +109,7 @@ chan_rcvd_oclose1(Channel *c)
 		c->istate = CHAN_INPUT_CLOSED;
 		break;
 	default:
-		error("channel %d: protocol error: chan_rcvd_oclose for istate %d",
+		error("channel %d: protocol error: rcvd_oclose for istate %d",
 		    c->self, c->istate);
 		return;
 	}
@@ -98,13 +123,15 @@ chan_read_failed_12(Channel *c)
 		debug("channel %d: input open -> drain", c->self);
 		chan_shutdown_read(c);
 		c->istate = CHAN_INPUT_WAIT_DRAIN;
+#if 0
 		if (buffer_len(&c->input) == 0) {
 			debug("channel %d: input: no drain shortcut", c->self);
 			chan_ibuf_empty(c);
 		}
+#endif
 		break;
 	default:
-		error("channel %d: internal error: we do not read, but chan_read_failed for istate %d",
+		error("channel %d: chan_read_failed for istate %d",
 		    c->self, c->istate);
 		break;
 	}
@@ -114,7 +141,7 @@ chan_ibuf_empty1(Channel *c)
 {
 	debug("channel %d: ibuf empty", c->self);
 	if (buffer_len(&c->input)) {
-		error("channel %d: internal error: chan_ibuf_empty for non empty buffer",
+		error("channel %d: chan_ibuf_empty for non empty buffer",
 		    c->self);
 		return;
 	}
@@ -125,7 +152,7 @@ chan_ibuf_empty1(Channel *c)
 		c->istate = CHAN_INPUT_WAIT_OCLOSE;
 		break;
 	default:
-		error("channel %d: internal error: chan_ibuf_empty for istate %d",
+		error("channel %d: chan_ibuf_empty for istate %d",
 		    c->self, c->istate);
 		break;
 	}
@@ -137,19 +164,23 @@ chan_rcvd_ieof1(Channel *c)
 	if (c->type != SSH_CHANNEL_OPEN) {
 		debug("channel %d: non-open", c->self);
 		if (c->istate == CHAN_INPUT_OPEN) {
-			debug("channel %d: non-open: input open -> wait_oclose", c->self);
+			debug("channel %d: non-open: input open -> wait_oclose",
+			    c->self);
 			chan_shutdown_read(c);
 			chan_send_ieof1(c);
 			c->istate = CHAN_INPUT_WAIT_OCLOSE;
 		} else {
-			error("channel %d: istate %d != open", c->self, c->istate);
+			error("channel %d: non-open: istate %d != open",
+			    c->self, c->istate);
 		}
 		if (c->ostate == CHAN_OUTPUT_OPEN) {
-			debug("channel %d: non-open: output open -> closed", c->self);
+			debug("channel %d: non-open: output open -> closed",
+			    c->self);
 			chan_send_oclose1(c);
 			c->ostate = CHAN_OUTPUT_CLOSED;
 		} else {
-			error("channel %d: ostate %d != open", c->self, c->ostate);
+			error("channel %d: non-open: ostate %d != open",
+			    c->self, c->ostate);
 		}
 		return;
 	}
@@ -163,7 +194,7 @@ chan_rcvd_ieof1(Channel *c)
 		c->ostate = CHAN_OUTPUT_CLOSED;
 		break;
 	default:
-		error("channel %d: protocol error: chan_rcvd_ieof for ostate %d",
+		error("channel %d: protocol error: rcvd_ieof for ostate %d",
 		    c->self, c->ostate);
 		break;
 	}
@@ -184,7 +215,7 @@ chan_write_failed1(Channel *c)
 		c->ostate = CHAN_OUTPUT_CLOSED;
 		break;
 	default:
-		error("channel %d: internal error: chan_write_failed for ostate %d",
+		error("channel %d: chan_write_failed for ostate %d",
 		    c->self, c->ostate);
 		break;
 	}
@@ -194,7 +225,7 @@ chan_obuf_empty1(Channel *c)
 {
 	debug("channel %d: obuf empty", c->self);
 	if (buffer_len(&c->output)) {
-		error("channel %d: internal error: chan_obuf_empty for non empty buffer",
+		error("channel %d: chan_obuf_empty for non empty buffer",
 		    c->self);
 		return;
 	}
@@ -205,7 +236,7 @@ chan_obuf_empty1(Channel *c)
 		c->ostate = CHAN_OUTPUT_CLOSED;
 		break;
 	default:
-		error("channel %d: internal error: chan_obuf_empty for ostate %d",
+		error("channel %d: internal error: obuf_empty for ostate %d",
 		    c->self, c->ostate);
 		break;
 	}
@@ -222,7 +253,7 @@ chan_send_ieof1(Channel *c)
 		packet_send();
 		break;
 	default:
-		error("channel %d: internal error: cannot send ieof for istate %d",
+		error("channel %d: cannot send ieof for istate %d",
 		    c->self, c->istate);
 		break;
 	}
@@ -241,7 +272,7 @@ chan_send_oclose1(Channel *c)
 		packet_send();
 		break;
 	default:
-		error("channel %d: internal error: cannot send oclose for ostate %d",
+		error("channel %d: cannot send oclose for ostate %d",
 		     c->self, c->ostate);
 		break;
 	}
@@ -265,7 +296,10 @@ chan_rcvd_oclose2(Channel *c)
 	}
 	switch (c->ostate) {
 	case CHAN_OUTPUT_OPEN:
-		/* wait until a data from the channel is consumed if a CLOSE is received */
+		/*
+		 * wait until a data from the channel is consumed if a CLOSE
+		 * is received
+		 */
 		debug("channel %d: output open -> drain", c->self);
 		c->ostate = CHAN_OUTPUT_WAIT_DRAIN;
 		break;
@@ -287,7 +321,7 @@ chan_ibuf_empty2(Channel *c)
 {
 	debug("channel %d: ibuf empty", c->self);
 	if (buffer_len(&c->input)) {
-		error("channel %d: internal error: chan_ibuf_empty for non empty buffer",
+		error("channel %d: chan_ibuf_empty for non empty buffer",
 		     c->self);
 		return;
 	}
@@ -299,7 +333,7 @@ chan_ibuf_empty2(Channel *c)
 		c->istate = CHAN_INPUT_CLOSED;
 		break;
 	default:
-		error("channel %d: internal error: chan_ibuf_empty for istate %d",
+		error("channel %d: chan_ibuf_empty for istate %d",
 		     c->self, c->istate);
 		break;
 	}
@@ -329,7 +363,7 @@ chan_write_failed2(Channel *c)
 		c->ostate = CHAN_OUTPUT_CLOSED;
 		break;
 	default:
-		error("channel %d: internal error: chan_write_failed for ostate %d",
+		error("channel %d: chan_write_failed for ostate %d",
 		    c->self, c->ostate);
 		break;
 	}
@@ -339,7 +373,7 @@ chan_obuf_empty2(Channel *c)
 {
 	debug("channel %d: obuf empty", c->self);
 	if (buffer_len(&c->output)) {
-		error("internal error: chan_obuf_empty %d for non empty buffer",
+		error("channel %d: chan_obuf_empty for non empty buffer",
 		    c->self);
 		return;
 	}
@@ -350,7 +384,7 @@ chan_obuf_empty2(Channel *c)
 		c->ostate = CHAN_OUTPUT_CLOSED;
 		break;
 	default:
-		error("channel %d: internal error: chan_obuf_empty for ostate %d",
+		error("channel %d: chan_obuf_empty for ostate %d",
 		    c->self, c->ostate);
 		break;
 	}
@@ -366,7 +400,7 @@ chan_send_eof2(Channel *c)
 		packet_send();
 		break;
 	default:
-		error("channel %d: internal error: cannot send eof for istate %d",
+		error("channel %d: cannot send eof for istate %d",
 		    c->self, c->istate);
 		break;
 	}
@@ -377,10 +411,10 @@ chan_send_close2(Channel *c)
 	debug("channel %d: send close", c->self);
 	if (c->ostate != CHAN_OUTPUT_CLOSED ||
 	    c->istate != CHAN_INPUT_CLOSED) {
-		error("channel %d: internal error: cannot send close for istate/ostate %d/%d",
+		error("channel %d: cannot send close for istate/ostate %d/%d",
 		    c->self, c->istate, c->ostate);
 	} else if (c->flags & CHAN_CLOSE_SENT) {
-		error("channel %d: internal error: already sent close", c->self);
+		error("channel %d: already sent close", c->self);
 	} else {
 		packet_start(SSH2_MSG_CHANNEL_CLOSE);
 		packet_put_int(c->remote_id);
@@ -480,11 +514,13 @@ chan_shutdown_write(Channel *c)
 	debug("channel %d: close_write", c->self);
 	if (c->sock != -1) {
 		if (shutdown(c->sock, SHUT_WR) < 0)
-			debug("channel %d: chan_shutdown_write: shutdown() failed for fd%d: %.100s",
+			debug("channel %d: chan_shutdown_write: "
+			    "shutdown() failed for fd%d: %.100s",
 			    c->self, c->sock, strerror(errno));
 	} else {
 		if (close(c->wfd) < 0)
-			log("channel %d: chan_shutdown_write: close() failed for fd%d: %.100s",
+			log("channel %d: chan_shutdown_write: "
+			    "close() failed for fd%d: %.100s",
 			    c->self, c->wfd, strerror(errno));
 		c->wfd = -1;
 	}
@@ -497,11 +533,14 @@ chan_shutdown_read(Channel *c)
 	debug("channel %d: close_read", c->self);
 	if (c->sock != -1) {
 		if (shutdown(c->sock, SHUT_RD) < 0)
-			error("channel %d: chan_shutdown_read: shutdown() failed for fd%d [i%d o%d]: %.100s",
-			    c->self, c->sock, c->istate, c->ostate, strerror(errno));
+			error("channel %d: chan_shutdown_read: "
+			    "shutdown() failed for fd%d [i%d o%d]: %.100s",
+			    c->self, c->sock, c->istate, c->ostate,
+			    strerror(errno));
 	} else {
 		if (close(c->rfd) < 0)
-			log("channel %d: chan_shutdown_read: close() failed for fd%d: %.100s",
+			log("channel %d: chan_shutdown_read: "
+			    "close() failed for fd%d: %.100s",
 			    c->self, c->rfd, strerror(errno));
 		c->rfd = -1;
 	}
diff --git a/usr.bin/ssh/channel-core.c b/usr.bin/ssh/channel-core.c
new file mode 100644
index 00000000000..74b242e6aa2
--- /dev/null
+++ b/usr.bin/ssh/channel-core.c
@@ -0,0 +1,988 @@
+/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ *                    All rights reserved
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose.  Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ *
+ *
+ * Copyright (c) 2001 Markus Friedl.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "includes.h"
+RCSID("$OpenBSD: channel-core.c,v 1.1 2001/05/30 12:55:07 markus Exp $");
+
+#include "ssh1.h"
+#include "ssh2.h"
+#include "packet.h"
+#include "xmalloc.h"
+#include "log.h"
+#include "channel.h"
+#include "compat.h"
+#include "canohost.h"
+
+extern int channels_alloc;
+extern int channel_max_fd;
+extern Channel **channels;
+
+void	 port_open_helper(Channel *c, char *rtype);
+
+/*
+ * 'channel_pre*' are called just before select() to add any bits relevant to
+ * channels in the select bitmasks.
+ */
+/*
+ * 'channel_post*': perform any appropriate operations for channels which
+ * have events pending.
+ */
+typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset);
+chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
+chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
+
+void
+channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset)
+{
+	FD_SET(c->sock, readset);
+}
+
+void
+channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset)
+{
+	debug3("channel %d: waiting for connection", c->self);
+	FD_SET(c->sock, writeset);
+}
+
+void
+channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset)
+{
+	if (buffer_len(&c->input) < packet_get_maxsize())
+		FD_SET(c->sock, readset);
+	if (buffer_len(&c->output) > 0)
+		FD_SET(c->sock, writeset);
+}
+
+void
+channel_pre_open_15(Channel *c, fd_set * readset, fd_set * writeset)
+{
+	/* test whether sockets are 'alive' for read/write */
+	if (c->istate == CHAN_INPUT_OPEN)
+		if (buffer_len(&c->input) < packet_get_maxsize())
+			FD_SET(c->sock, readset);
+	if (c->ostate == CHAN_OUTPUT_OPEN ||
+	    c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
+		if (buffer_len(&c->output) > 0) {
+			FD_SET(c->sock, writeset);
+		} else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
+			chan_obuf_empty(c);
+		}
+	}
+}
+
+void
+channel_pre_open_20(Channel *c, fd_set * readset, fd_set * writeset)
+{
+	if (c->istate == CHAN_INPUT_OPEN &&
+	    c->remote_window > 0 &&
+	    buffer_len(&c->input) < c->remote_window)
+		FD_SET(c->rfd, readset);
+	if (c->ostate == CHAN_OUTPUT_OPEN ||
+	    c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
+		if (buffer_len(&c->output) > 0) {
+			FD_SET(c->wfd, writeset);
+		} else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
+			chan_obuf_empty(c);
+		}
+	}
+	/** XXX check close conditions, too */
+	if (c->efd != -1) {
+		if (c->extended_usage == CHAN_EXTENDED_WRITE &&
+		    buffer_len(&c->extended) > 0)
+			FD_SET(c->efd, writeset);
+		else if (c->extended_usage == CHAN_EXTENDED_READ &&
+		    buffer_len(&c->extended) < c->remote_window)
+			FD_SET(c->efd, readset);
+	}
+}
+
+void
+channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset)
+{
+	if (buffer_len(&c->input) == 0) {
+		packet_start(SSH_MSG_CHANNEL_CLOSE);
+		packet_put_int(c->remote_id);
+		packet_send();
+		c->type = SSH_CHANNEL_CLOSED;
+		debug("channel %d: closing after input drain.", c->self);
+	}
+}
+
+void
+channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset)
+{
+	if (buffer_len(&c->output) == 0)
+		chan_mark_dead(c);
+	else
+		FD_SET(c->sock, writeset);
+}
+
+void
+channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset)
+{
+	int ret = x11_check_cookie(&c->output);
+	if (ret == 1) {
+		/* Start normal processing for the channel. */
+		c->type = SSH_CHANNEL_OPEN;
+		channel_pre_open_13(c, readset, writeset);
+	} else if (ret == -1) {
+		/*
+		 * We have received an X11 connection that has bad
+		 * authentication information.
+		 */
+		log("X11 connection rejected because of wrong authentication.");
+		buffer_clear(&c->input);
+		buffer_clear(&c->output);
+		close(c->sock);
+		c->sock = -1;
+		c->type = SSH_CHANNEL_CLOSED;
+		packet_start(SSH_MSG_CHANNEL_CLOSE);
+		packet_put_int(c->remote_id);
+		packet_send();
+	}
+}
+
+void
+channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset)
+{
+	int ret = x11_check_cookie(&c->output);
+	if (ret == 1) {
+		c->type = SSH_CHANNEL_OPEN;
+		if (compat20)
+			channel_pre_open_20(c, readset, writeset);
+		else
+			channel_pre_open_15(c, readset, writeset);
+	} else if (ret == -1) {
+		debug("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
+		chan_read_failed(c);	/** force close? */
+		chan_write_failed(c);
+		debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
+	}
+}
+
+/* try to decode a socks4 header */
+int
+channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset)
+{
+	u_char *p, *host;
+	int len, have, i, found;
+	char username[256];	
+	struct {
+		u_int8_t version;
+		u_int8_t command;
+		u_int16_t dest_port;
+		struct in_addr dest_addr;
+	} s4_req, s4_rsp;
+
+	debug2("channel %d: decode socks4", c->self);
+
+	have = buffer_len(&c->input);
+	len = sizeof(s4_req);
+	if (have < len)
+		return 0;
+	p = buffer_ptr(&c->input);
+	for (found = 0, i = len; i < have; i++) {
+		if (p[i] == '\0') {
+			found = 1;
+			break;
+		}
+		if (i > 1024) {
+			/* the peer is probably sending garbage */
+			debug("channel %d: decode socks4: too long",
+			    c->self);
+			return -1;
+		}
+	}
+	if (!found)
+		return 0;
+	buffer_get(&c->input, (char *)&s4_req.version, 1);
+	buffer_get(&c->input, (char *)&s4_req.command, 1);
+	buffer_get(&c->input, (char *)&s4_req.dest_port, 2);
+	buffer_get(&c->input, (char *)&s4_req.dest_addr, 4);
+	have = buffer_len(&c->input);
+	p = buffer_ptr(&c->input);
+	len = strlen(p);
+	debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
+	if (len > have)
+		fatal("channel %d: decode socks4: len %d > have %d",
+		    c->self, len, have);
+	strlcpy(username, p, sizeof(username));
+	buffer_consume(&c->input, len);
+	buffer_consume(&c->input, 1);		/* trailing '\0' */
+
+	host = inet_ntoa(s4_req.dest_addr);
+	strlcpy(c->path, host, sizeof(c->path));
+	c->host_port = ntohs(s4_req.dest_port);
+	
+	debug("channel %d: dynamic request: socks4 host %s port %u command %u",
+	    c->self, host, c->host_port, s4_req.command);
+
+	if (s4_req.command != 1) {
+		debug("channel %d: cannot handle: socks4 cn %d",
+		    c->self, s4_req.command);
+		return -1;
+	}
+	s4_rsp.version = 0;			/* vn: 0 for reply */
+	s4_rsp.command = 90;			/* cd: req granted */
+	s4_rsp.dest_port = 0;			/* ignored */
+	s4_rsp.dest_addr.s_addr = INADDR_ANY;	/* ignored */
+	buffer_append(&c->output, (char *)&s4_rsp, sizeof(s4_rsp));
+	return 1;
+}
+
+/* dynamic port forwarding */
+void
+channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset)
+{
+	u_char *p;
+	int have, ret;
+
+	have = buffer_len(&c->input);
+
+	debug2("channel %d: pre_dynamic: have %d", c->self, have);
+	/* buffer_dump(&c->input); */
+	/* check if the fixed size part of the packet is in buffer. */
+	if (have < 4) {
+		/* need more */
+		FD_SET(c->sock, readset);
+		return;
+	}
+	/* try to guess the protocol */
+	p = buffer_ptr(&c->input);
+	switch (p[0]) {
+	case 0x04:
+		ret = channel_decode_socks4(c, readset, writeset);
+		break;
+	default:
+		ret = -1;
+		break;
+	}
+	if (ret < 0) {
+		chan_mark_dead(c);
+	} else if (ret == 0) {
+		debug2("channel %d: pre_dynamic: need more", c->self);
+		/* need more */
+		FD_SET(c->sock, readset);
+	} else {
+		/* switch to the next state */
+		c->type = SSH_CHANNEL_OPENING;
+		port_open_helper(c, "direct-tcpip");
+	}
+}
+
+/* This is our fake X11 server socket. */
+void
+channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset)
+{
+	Channel *nc;
+	struct sockaddr addr;
+	int newsock;
+	socklen_t addrlen;
+	char buf[16384], *remote_ipaddr;
+	int remote_port;
+
+	if (FD_ISSET(c->sock, readset)) {
+		debug("X11 connection requested.");
+		addrlen = sizeof(addr);
+		newsock = accept(c->sock, &addr, &addrlen);
+		if (newsock < 0) {
+			error("accept: %.100s", strerror(errno));
+			return;
+		}
+		remote_ipaddr = get_peer_ipaddr(newsock);
+		remote_port = get_peer_port(newsock);
+		snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
+		    remote_ipaddr, remote_port);
+
+		nc = channel_new("accepted x11 socket",
+		    SSH_CHANNEL_OPENING, newsock, newsock, -1,
+		    c->local_window_max, c->local_maxpacket,
+		    0, xstrdup(buf), 1);
+		if (nc == NULL) {
+			close(newsock);
+			xfree(remote_ipaddr);
+			return;
+		}
+		if (compat20) {
+			packet_start(SSH2_MSG_CHANNEL_OPEN);
+			packet_put_cstring("x11");
+			packet_put_int(nc->self);
+			packet_put_int(c->local_window_max);
+			packet_put_int(c->local_maxpacket);
+			/* originator ipaddr and port */
+			packet_put_cstring(remote_ipaddr);
+			if (datafellows & SSH_BUG_X11FWD) {
+				debug("ssh2 x11 bug compat mode");
+			} else {
+				packet_put_int(remote_port);
+			}
+			packet_send();
+		} else {
+			packet_start(SSH_SMSG_X11_OPEN);
+			packet_put_int(nc->self);
+			if (packet_get_protocol_flags() &
+			    SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
+				packet_put_string(buf, strlen(buf));
+			packet_send();
+		}
+		xfree(remote_ipaddr);
+	}
+}
+
+void
+port_open_helper(Channel *c, char *rtype)
+{
+	int direct;
+	char buf[1024];
+	char *remote_ipaddr = get_peer_ipaddr(c->sock);
+	u_short remote_port = get_peer_port(c->sock);
+
+	direct = (strcmp(rtype, "direct-tcpip") == 0);
+
+	snprintf(buf, sizeof buf,
+	    "%s: listening port %d for %.100s port %d, "
+	    "connect from %.200s port %d",
+	    rtype, c->listening_port, c->path, c->host_port,
+	    remote_ipaddr, remote_port);
+
+	xfree(c->remote_name);
+	c->remote_name = xstrdup(buf);
+
+	if (compat20) {
+		packet_start(SSH2_MSG_CHANNEL_OPEN);
+		packet_put_cstring(rtype);
+		packet_put_int(c->self);
+		packet_put_int(c->local_window_max);
+		packet_put_int(c->local_maxpacket);
+		if (direct) {
+			/* target host, port */
+			packet_put_cstring(c->path);
+			packet_put_int(c->host_port);
+		} else {
+			/* listen address, port */
+			packet_put_cstring(c->path);
+			packet_put_int(c->listening_port);
+		}
+		/* originator host and port */
+		packet_put_cstring(remote_ipaddr);
+		packet_put_int(remote_port);
+		packet_send();
+	} else {
+		packet_start(SSH_MSG_PORT_OPEN);
+		packet_put_int(c->self);
+		packet_put_cstring(c->path);
+		packet_put_int(c->host_port);
+		if (packet_get_protocol_flags() &
+		    SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
+			packet_put_cstring(c->remote_name);
+		packet_send();
+	}
+	xfree(remote_ipaddr);
+}
+
+/*
+ * This socket is listening for connections to a forwarded TCP/IP port.
+ */
+void
+channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset)
+{
+	Channel *nc;
+	struct sockaddr addr;
+	int newsock, nextstate;
+	socklen_t addrlen;
+	char *rtype;
+
+	if (FD_ISSET(c->sock, readset)) {
+		debug("Connection to port %d forwarding "
+		    "to %.100s port %d requested.",
+		    c->listening_port, c->path, c->host_port);
+
+		rtype = (c->type == SSH_CHANNEL_RPORT_LISTENER) ?
+		    "forwarded-tcpip" : "direct-tcpip";
+		nextstate = (c->host_port == 0 &&
+		    c->type != SSH_CHANNEL_RPORT_LISTENER) ?
+		    SSH_CHANNEL_DYNAMIC : SSH_CHANNEL_OPENING;
+
+		addrlen = sizeof(addr);
+		newsock = accept(c->sock, &addr, &addrlen);
+		if (newsock < 0) {
+			error("accept: %.100s", strerror(errno));
+			return;
+		}
+		nc = channel_new(rtype,
+		    nextstate, newsock, newsock, -1,
+		    c->local_window_max, c->local_maxpacket,
+		    0, xstrdup(rtype), 1);
+		if (nc == NULL) {
+			error("channel_post_port_listener: no new channel:");
+			close(newsock);
+			return;
+		}
+		nc->listening_port = c->listening_port;
+		nc->host_port = c->host_port;
+		strlcpy(nc->path, c->path, sizeof(nc->path));
+
+		if (nextstate != SSH_CHANNEL_DYNAMIC)
+			port_open_helper(nc, rtype);
+	}
+}
+
+/*
+ * This is the authentication agent socket listening for connections from
+ * clients.
+ */
+void
+channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset)
+{
+	Channel *nc;
+	char *name;
+	int newsock;
+	struct sockaddr addr;
+	socklen_t addrlen;
+
+	if (FD_ISSET(c->sock, readset)) {
+		addrlen = sizeof(addr);
+		newsock = accept(c->sock, &addr, &addrlen);
+		if (newsock < 0) {
+			error("accept from auth socket: %.100s", strerror(errno));
+			return;
+		}
+		name = xstrdup("accepted auth socket");
+		nc = channel_new("accepted auth socket",
+		    SSH_CHANNEL_OPENING, newsock, newsock, -1,
+		    c->local_window_max, c->local_maxpacket,
+		    0, name, 1);
+		if (nc == NULL) {
+			error("channel_post_auth_listener: channel_new failed");
+			xfree(name);
+			close(newsock);
+		}
+		if (compat20) {
+			packet_start(SSH2_MSG_CHANNEL_OPEN);
+			packet_put_cstring("auth-agent@openssh.com");
+			packet_put_int(nc->self);
+			packet_put_int(c->local_window_max);
+			packet_put_int(c->local_maxpacket);
+		} else {
+			packet_start(SSH_SMSG_AGENT_OPEN);
+			packet_put_int(nc->self);
+		}
+		packet_send();
+	}
+}
+
+void
+channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset)
+{
+	int err = 0;
+	int sz = sizeof(err);
+
+	if (FD_ISSET(c->sock, writeset)) {
+		if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, (char *)&err,
+		    &sz) < 0) {
+			err = errno;
+			error("getsockopt SO_ERROR failed");
+		}
+		if (err == 0) {
+			debug("channel %d: connected", c->self);
+			c->type = SSH_CHANNEL_OPEN;
+			if (compat20) {
+				packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
+				packet_put_int(c->remote_id);
+				packet_put_int(c->self);
+				packet_put_int(c->local_window);
+				packet_put_int(c->local_maxpacket);
+			} else {
+				packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
+				packet_put_int(c->remote_id);
+				packet_put_int(c->self);
+			}
+		} else {
+			debug("channel %d: not connected: %s",
+			    c->self, strerror(err));
+			if (compat20) {
+				packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
+				packet_put_int(c->remote_id);
+				packet_put_int(SSH2_OPEN_CONNECT_FAILED);
+				if (!(datafellows & SSH_BUG_OPENFAILURE)) {
+					packet_put_cstring(strerror(err));
+					packet_put_cstring("");
+				}
+			} else {
+				packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
+				packet_put_int(c->remote_id);
+			}
+			chan_mark_dead(c);
+		}
+		packet_send();
+	}
+}
+
+int
+channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset)
+{
+	char buf[16*1024];
+	int len;
+
+	if (c->rfd != -1 &&
+	    FD_ISSET(c->rfd, readset)) {
+		len = read(c->rfd, buf, sizeof(buf));
+		if (len < 0 && (errno == EINTR || errno == EAGAIN))
+			return 1;
+		if (len <= 0) {
+			debug("channel %d: read<=0 rfd %d len %d",
+			    c->self, c->rfd, len);
+			if (c->type != SSH_CHANNEL_OPEN) {
+				debug("channel %d: not open", c->self);
+				chan_mark_dead(c);
+				return -1;
+			} else if (compat13) {
+				buffer_consume(&c->output, buffer_len(&c->output));
+				c->type = SSH_CHANNEL_INPUT_DRAINING;
+				debug("channel %d: input draining.", c->self);
+			} else {
+				chan_read_failed(c);
+			}
+			return -1;
+		}
+		if(c->input_filter != NULL) {
+			if (c->input_filter(c, buf, len) == -1) {
+				debug("channel %d: filter stops", c->self);
+				chan_read_failed(c);
+			}
+		} else {
+			buffer_append(&c->input, buf, len);
+		}
+	}
+	return 1;
+}
+int
+channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset)
+{
+	struct termios tio;
+	int len;
+
+	/* Send buffered output data to the socket. */
+	if (c->wfd != -1 &&
+	    FD_ISSET(c->wfd, writeset) &&
+	    buffer_len(&c->output) > 0) {
+		len = write(c->wfd, buffer_ptr(&c->output),
+		    buffer_len(&c->output));
+		if (len < 0 && (errno == EINTR || errno == EAGAIN))
+			return 1;
+		if (len <= 0) {
+			if (c->type != SSH_CHANNEL_OPEN) {
+				debug("channel %d: not open", c->self);
+				chan_mark_dead(c);
+				return -1;
+			} else if (compat13) {
+				buffer_consume(&c->output, buffer_len(&c->output));
+				debug("channel %d: input draining.", c->self);
+				c->type = SSH_CHANNEL_INPUT_DRAINING;
+			} else {
+				chan_write_failed(c);
+			}
+			return -1;
+		}
+		if (compat20 && c->isatty) {
+			if (tcgetattr(c->wfd, &tio) == 0 &&
+			    !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
+				/*
+				 * Simulate echo to reduce the impact of
+				 * traffic analysis. We need to match the
+				 * size of a SSH2_MSG_CHANNEL_DATA message
+				 * (4 byte channel id + data)
+				 */
+				packet_send_ignore(4 + len);
+				packet_send();
+			}
+		}
+		buffer_consume(&c->output, len);
+		if (compat20 && len > 0) {
+			c->local_consumed += len;
+		}
+	}
+	return 1;
+}
+int
+channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset)
+{
+	char buf[16*1024];
+	int len;
+
+/** XXX handle drain efd, too */
+	if (c->efd != -1) {
+		if (c->extended_usage == CHAN_EXTENDED_WRITE &&
+		    FD_ISSET(c->efd, writeset) &&
+		    buffer_len(&c->extended) > 0) {
+			len = write(c->efd, buffer_ptr(&c->extended),
+			    buffer_len(&c->extended));
+			debug2("channel %d: written %d to efd %d",
+			    c->self, len, c->efd);
+			if (len < 0 && (errno == EINTR || errno == EAGAIN))
+				return 1;
+			if (len <= 0) {
+				debug2("channel %d: closing write-efd %d",
+				    c->self, c->efd);
+				close(c->efd);
+				c->efd = -1;
+			} else {
+				buffer_consume(&c->extended, len);
+				c->local_consumed += len;
+			}
+		} else if (c->extended_usage == CHAN_EXTENDED_READ &&
+		    FD_ISSET(c->efd, readset)) {
+			len = read(c->efd, buf, sizeof(buf));
+			debug2("channel %d: read %d from efd %d",
+			     c->self, len, c->efd);
+			if (len < 0 && (errno == EINTR || errno == EAGAIN))
+				return 1;
+			if (len <= 0) {
+				debug2("channel %d: closing read-efd %d",
+				    c->self, c->efd);
+				close(c->efd);
+				c->efd = -1;
+			} else {
+				buffer_append(&c->extended, buf, len);
+			}
+		}
+	}
+	return 1;
+}
+int
+channel_check_window(Channel *c)
+{
+	if (c->type == SSH_CHANNEL_OPEN &&
+	    !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
+	    c->local_window < c->local_window_max/2 &&
+	    c->local_consumed > 0) {
+		packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
+		packet_put_int(c->remote_id);
+		packet_put_int(c->local_consumed);
+		packet_send();
+		debug2("channel %d: window %d sent adjust %d",
+		    c->self, c->local_window,
+		    c->local_consumed);
+		c->local_window += c->local_consumed;
+		c->local_consumed = 0;
+	}
+	return 1;
+}
+
+void
+channel_post_open_1(Channel *c, fd_set * readset, fd_set * writeset)
+{
+	channel_handle_rfd(c, readset, writeset);
+	channel_handle_wfd(c, readset, writeset);
+}
+
+void
+channel_post_open_2(Channel *c, fd_set * readset, fd_set * writeset)
+{
+	channel_handle_rfd(c, readset, writeset);
+	channel_handle_wfd(c, readset, writeset);
+	channel_handle_efd(c, readset, writeset);
+
+	channel_check_window(c);
+}
+
+void
+channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset)
+{
+	int len;
+	/* Send buffered output data to the socket. */
+	if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
+		len = write(c->sock, buffer_ptr(&c->output),
+			    buffer_len(&c->output));
+		if (len <= 0)
+			buffer_consume(&c->output, buffer_len(&c->output));
+		else
+			buffer_consume(&c->output, len);
+	}
+}
+
+void
+channel_handler_init_20(void)
+{
+	channel_pre[SSH_CHANNEL_OPEN] =			&channel_pre_open_20;
+	channel_pre[SSH_CHANNEL_X11_OPEN] =		&channel_pre_x11_open;
+	channel_pre[SSH_CHANNEL_PORT_LISTENER] =	&channel_pre_listener;
+	channel_pre[SSH_CHANNEL_RPORT_LISTENER] =	&channel_pre_listener;
+	channel_pre[SSH_CHANNEL_X11_LISTENER] =		&channel_pre_listener;
+	channel_pre[SSH_CHANNEL_AUTH_SOCKET] =		&channel_pre_listener;
+	channel_pre[SSH_CHANNEL_CONNECTING] =		&channel_pre_connecting;
+	channel_pre[SSH_CHANNEL_DYNAMIC] =		&channel_pre_dynamic;
+
+	channel_post[SSH_CHANNEL_OPEN] =		&channel_post_open_2;
+	channel_post[SSH_CHANNEL_PORT_LISTENER] =	&channel_post_port_listener;
+	channel_post[SSH_CHANNEL_RPORT_LISTENER] =	&channel_post_port_listener;
+	channel_post[SSH_CHANNEL_X11_LISTENER] =	&channel_post_x11_listener;
+	channel_post[SSH_CHANNEL_AUTH_SOCKET] =		&channel_post_auth_listener;
+	channel_post[SSH_CHANNEL_CONNECTING] =		&channel_post_connecting;
+	channel_post[SSH_CHANNEL_DYNAMIC] =		&channel_post_open_2;
+}
+
+void
+channel_handler_init_13(void)
+{
+	channel_pre[SSH_CHANNEL_OPEN] =			&channel_pre_open_13;
+	channel_pre[SSH_CHANNEL_X11_OPEN] =		&channel_pre_x11_open_13;
+	channel_pre[SSH_CHANNEL_X11_LISTENER] =		&channel_pre_listener;
+	channel_pre[SSH_CHANNEL_PORT_LISTENER] =	&channel_pre_listener;
+	channel_pre[SSH_CHANNEL_AUTH_SOCKET] =		&channel_pre_listener;
+	channel_pre[SSH_CHANNEL_INPUT_DRAINING] =	&channel_pre_input_draining;
+	channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] =	&channel_pre_output_draining;
+	channel_pre[SSH_CHANNEL_CONNECTING] =		&channel_pre_connecting;
+	channel_pre[SSH_CHANNEL_DYNAMIC] =		&channel_pre_dynamic;
+
+	channel_post[SSH_CHANNEL_OPEN] =		&channel_post_open_1;
+	channel_post[SSH_CHANNEL_X11_LISTENER] =	&channel_post_x11_listener;
+	channel_post[SSH_CHANNEL_PORT_LISTENER] =	&channel_post_port_listener;
+	channel_post[SSH_CHANNEL_AUTH_SOCKET] =		&channel_post_auth_listener;
+	channel_post[SSH_CHANNEL_OUTPUT_DRAINING] =	&channel_post_output_drain_13;
+	channel_post[SSH_CHANNEL_CONNECTING] =		&channel_post_connecting;
+	channel_post[SSH_CHANNEL_DYNAMIC] =		&channel_post_open_1;
+}
+
+void
+channel_handler_init_15(void)
+{
+	channel_pre[SSH_CHANNEL_OPEN] =			&channel_pre_open_15;
+	channel_pre[SSH_CHANNEL_X11_OPEN] =		&channel_pre_x11_open;
+	channel_pre[SSH_CHANNEL_X11_LISTENER] =		&channel_pre_listener;
+	channel_pre[SSH_CHANNEL_PORT_LISTENER] =	&channel_pre_listener;
+	channel_pre[SSH_CHANNEL_AUTH_SOCKET] =		&channel_pre_listener;
+	channel_pre[SSH_CHANNEL_CONNECTING] =		&channel_pre_connecting;
+	channel_pre[SSH_CHANNEL_DYNAMIC] =		&channel_pre_dynamic;
+
+	channel_post[SSH_CHANNEL_X11_LISTENER] =	&channel_post_x11_listener;
+	channel_post[SSH_CHANNEL_PORT_LISTENER] =	&channel_post_port_listener;
+	channel_post[SSH_CHANNEL_AUTH_SOCKET] =		&channel_post_auth_listener;
+	channel_post[SSH_CHANNEL_OPEN] =		&channel_post_open_1;
+	channel_post[SSH_CHANNEL_CONNECTING] =		&channel_post_connecting;
+	channel_post[SSH_CHANNEL_DYNAMIC] =		&channel_post_open_1;
+}
+
+void
+channel_handler_init(void)
+{
+	int i;
+	for(i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
+		channel_pre[i] = NULL;
+		channel_post[i] = NULL;
+	}
+	if (compat20)
+		channel_handler_init_20();
+	else if (compat13)
+		channel_handler_init_13();
+	else
+		channel_handler_init_15();
+}
+
+void
+channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset)
+{
+	static int did_init = 0;
+	int i;
+	Channel *c;
+
+	if (!did_init) {
+		channel_handler_init();
+		did_init = 1;
+	}
+	for (i = 0; i < channels_alloc; i++) {
+		c = channels[i];
+		if (c == NULL)
+			continue;
+		if (ftab[c->type] != NULL)
+			(*ftab[c->type])(c, readset, writeset);
+		if (chan_is_dead(c)) {
+			/*
+			 * we have to remove the fd's from the select mask
+			 * before the channels are free'd and the fd's are
+			 * closed
+			 */
+			if (c->wfd != -1)
+				FD_CLR(c->wfd, writeset);
+			if (c->rfd != -1)
+				FD_CLR(c->rfd, readset);
+			if (c->efd != -1) {
+				if (c->extended_usage == CHAN_EXTENDED_READ)
+					FD_CLR(c->efd, readset);
+				if (c->extended_usage == CHAN_EXTENDED_WRITE)
+					FD_CLR(c->efd, writeset);
+			}
+			channel_free(c);
+		}
+	}
+}
+
+/*
+ * Allocate/update select bitmasks and add any bits relevant to channels in
+ * select bitmasks.
+ */
+void
+channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
+    int rekeying)
+{
+	int n;
+	u_int sz;
+
+	n = MAX(*maxfdp, channel_max_fd);
+
+	sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
+	if (*readsetp == NULL || n > *maxfdp) {
+		if (*readsetp)
+			xfree(*readsetp);
+		if (*writesetp)
+			xfree(*writesetp);
+		*readsetp = xmalloc(sz);
+		*writesetp = xmalloc(sz);
+		*maxfdp = n;
+	}
+	memset(*readsetp, 0, sz);
+	memset(*writesetp, 0, sz);
+
+	if (!rekeying)
+		channel_handler(channel_pre, *readsetp, *writesetp);
+}
+
+/*
+ * After select, perform any appropriate operations for channels which have
+ * events pending.
+ */
+void
+channel_after_select(fd_set * readset, fd_set * writeset)
+{
+	channel_handler(channel_post, readset, writeset);
+}
+
+
+/* If there is data to send to the connection, enqueue some of it now. */
+
+void
+channel_output_poll()
+{
+	int len, i;
+	Channel *c;
+
+	for (i = 0; i < channels_alloc; i++) {
+		c = channels[i];
+		if (c == NULL)
+			continue;
+
+		/*
+		 * We are only interested in channels that can have buffered
+		 * incoming data.
+		 */
+		if (compat13) {
+			if (c->type != SSH_CHANNEL_OPEN &&
+			    c->type != SSH_CHANNEL_INPUT_DRAINING)
+				continue;
+		} else {
+			if (c->type != SSH_CHANNEL_OPEN)
+				continue;
+		}
+		if (compat20 &&
+		    (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
+			/* XXX is this true? */
+			debug2("channel %d: no data after CLOSE", c->self);
+			continue;
+		}
+
+		/* Get the amount of buffered data for this channel. */
+		if ((c->istate == CHAN_INPUT_OPEN ||
+		    c->istate == CHAN_INPUT_WAIT_DRAIN) &&
+		    (len = buffer_len(&c->input)) > 0) {
+			/*
+			 * Send some data for the other side over the secure
+			 * connection.
+			 */
+			if (compat20) {
+				if (len > c->remote_window)
+					len = c->remote_window;
+				if (len > c->remote_maxpacket)
+					len = c->remote_maxpacket;
+			} else {
+				if (packet_is_interactive()) {
+					if (len > 1024)
+						len = 512;
+				} else {
+					/* Keep the packets at reasonable size. */
+					if (len > packet_get_maxsize()/2)
+						len = packet_get_maxsize()/2;
+				}
+			}
+			if (len > 0) {
+				packet_start(compat20 ?
+				    SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
+				packet_put_int(c->remote_id);
+				packet_put_string(buffer_ptr(&c->input), len);
+				packet_send();
+				buffer_consume(&c->input, len);
+				c->remote_window -= len;
+			}
+		} else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
+			if (compat13)
+				fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
+			/*
+			 * input-buffer is empty and read-socket shutdown:
+			 * tell peer, that we will not send more data: send IEOF
+			 */
+			chan_ibuf_empty(c);
+		}
+		/* Send extended data, i.e. stderr */
+		if (compat20 &&
+		    c->remote_window > 0 &&
+		    (len = buffer_len(&c->extended)) > 0 &&
+		    c->extended_usage == CHAN_EXTENDED_READ) {
+			debug2("channel %d: rwin %d elen %d euse %d",
+			    c->self, c->remote_window, buffer_len(&c->extended),
+			    c->extended_usage);
+			if (len > c->remote_window)
+				len = c->remote_window;
+			if (len > c->remote_maxpacket)
+				len = c->remote_maxpacket;
+			packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
+			packet_put_int(c->remote_id);
+			packet_put_int(SSH2_EXTENDED_DATA_STDERR);
+			packet_put_string(buffer_ptr(&c->extended), len);
+			packet_send();
+			buffer_consume(&c->extended, len);
+			c->remote_window -= len;
+			debug2("channel %d: sent ext data %d", c->self, len);
+		}
+	}
+}
diff --git a/usr.bin/ssh/channel-input.c b/usr.bin/ssh/channel-input.c
new file mode 100644
index 00000000000..59b42bb6af4
--- /dev/null
+++ b/usr.bin/ssh/channel-input.c
@@ -0,0 +1,384 @@
+/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ *                    All rights reserved
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose.  Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ *
+ *
+ * Copyright (c) 2001 Markus Friedl.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "includes.h"
+RCSID("$OpenBSD: channel-input.c,v 1.1 2001/05/30 12:55:07 markus Exp $");
+
+#include "ssh1.h"
+#include "ssh2.h"
+#include "packet.h"
+#include "xmalloc.h"
+#include "log.h"
+#include "channel.h"
+#include "compat.h"
+
+
+void
+channel_input_data(int type, int plen, void *ctxt)
+{
+	int id;
+	char *data;
+	u_int data_len;
+	Channel *c;
+
+	/* Get the channel number and verify it. */
+	id = packet_get_int();
+	c = channel_lookup(id);
+	if (c == NULL)
+		packet_disconnect("Received data for nonexistent channel %d.", id);
+
+	/* Ignore any data for non-open channels (might happen on close) */
+	if (c->type != SSH_CHANNEL_OPEN &&
+	    c->type != SSH_CHANNEL_X11_OPEN)
+		return;
+
+	/* same for protocol 1.5 if output end is no longer open */
+	if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN)
+		return;
+
+	/* Get the data. */
+	data = packet_get_string(&data_len);
+	packet_done();
+
+	if (compat20){
+		if (data_len > c->local_maxpacket) {
+			log("channel %d: rcvd big packet %d, maxpack %d",
+			    c->self, data_len, c->local_maxpacket);
+		}
+		if (data_len > c->local_window) {
+			log("channel %d: rcvd too much data %d, win %d",
+			    c->self, data_len, c->local_window);
+			xfree(data);
+			return;
+		}
+		c->local_window -= data_len;
+	}else{
+		packet_integrity_check(plen, 4 + 4 + data_len, type);
+	}
+	buffer_append(&c->output, data, data_len);
+	xfree(data);
+}
+
+void
+channel_input_extended_data(int type, int plen, void *ctxt)
+{
+	int id;
+	int tcode;
+	char *data;
+	u_int data_len;
+	Channel *c;
+
+	/* Get the channel number and verify it. */
+	id = packet_get_int();
+	c = channel_lookup(id);
+
+	if (c == NULL)
+		packet_disconnect("Received extended_data for bad channel %d.", id);
+	if (c->type != SSH_CHANNEL_OPEN) {
+		log("channel %d: ext data for non open", id);
+		return;
+	}
+	tcode = packet_get_int();
+	if (c->efd == -1 ||
+	    c->extended_usage != CHAN_EXTENDED_WRITE ||
+	    tcode != SSH2_EXTENDED_DATA_STDERR) {
+		log("channel %d: bad ext data", c->self);
+		return;
+	}
+	data = packet_get_string(&data_len);
+	packet_done();
+	if (data_len > c->local_window) {
+		log("channel %d: rcvd too much extended_data %d, win %d",
+		    c->self, data_len, c->local_window);
+		xfree(data);
+		return;
+	}
+	debug2("channel %d: rcvd ext data %d", c->self, data_len);
+	c->local_window -= data_len;
+	buffer_append(&c->extended, data, data_len);
+	xfree(data);
+}
+
+void
+channel_input_ieof(int type, int plen, void *ctxt)
+{
+	int id;
+	Channel *c;
+
+	packet_integrity_check(plen, 4, type);
+
+	id = packet_get_int();
+	c = channel_lookup(id);
+	if (c == NULL)
+		packet_disconnect("Received ieof for nonexistent channel %d.", id);
+	chan_rcvd_ieof(c);
+}
+
+void
+channel_input_close(int type, int plen, void *ctxt)
+{
+	int id;
+	Channel *c;
+
+	packet_integrity_check(plen, 4, type);
+
+	id = packet_get_int();
+	c = channel_lookup(id);
+	if (c == NULL)
+		packet_disconnect("Received close for nonexistent channel %d.", id);
+
+	/*
+	 * Send a confirmation that we have closed the channel and no more
+	 * data is coming for it.
+	 */
+	packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
+	packet_put_int(c->remote_id);
+	packet_send();
+
+	/*
+	 * If the channel is in closed state, we have sent a close request,
+	 * and the other side will eventually respond with a confirmation.
+	 * Thus, we cannot free the channel here, because then there would be
+	 * no-one to receive the confirmation.  The channel gets freed when
+	 * the confirmation arrives.
+	 */
+	if (c->type != SSH_CHANNEL_CLOSED) {
+		/*
+		 * Not a closed channel - mark it as draining, which will
+		 * cause it to be freed later.
+		 */
+		buffer_consume(&c->input, buffer_len(&c->input));
+		c->type = SSH_CHANNEL_OUTPUT_DRAINING;
+	}
+}
+
+/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
+void
+channel_input_oclose(int type, int plen, void *ctxt)
+{
+	int id = packet_get_int();
+	Channel *c = channel_lookup(id);
+	packet_integrity_check(plen, 4, type);
+	if (c == NULL)
+		packet_disconnect("Received oclose for nonexistent channel %d.", id);
+	chan_rcvd_oclose(c);
+}
+
+void
+channel_input_close_confirmation(int type, int plen, void *ctxt)
+{
+	int id = packet_get_int();
+	Channel *c = channel_lookup(id);
+
+	packet_done();
+	if (c == NULL)
+		packet_disconnect("Received close confirmation for "
+		    "out-of-range channel %d.", id);
+	if (c->type != SSH_CHANNEL_CLOSED)
+		packet_disconnect("Received close confirmation for "
+		    "non-closed channel %d (type %d).", id, c->type);
+	channel_free(c);
+}
+
+void
+channel_input_open_confirmation(int type, int plen, void *ctxt)
+{
+	int id, remote_id;
+	Channel *c;
+
+	if (!compat20)
+		packet_integrity_check(plen, 4 + 4, type);
+
+	id = packet_get_int();
+	c = channel_lookup(id);
+
+	if (c==NULL || c->type != SSH_CHANNEL_OPENING)
+		packet_disconnect("Received open confirmation for "
+		    "non-opening channel %d.", id);
+	remote_id = packet_get_int();
+	/* Record the remote channel number and mark that the channel is now open. */
+	c->remote_id = remote_id;
+	c->type = SSH_CHANNEL_OPEN;
+
+	if (compat20) {
+		c->remote_window = packet_get_int();
+		c->remote_maxpacket = packet_get_int();
+		packet_done();
+		if (c->cb_fn != NULL && c->cb_event == type) {
+			debug2("callback start");
+			c->cb_fn(c->self, c->cb_arg);
+			debug2("callback done");
+		}
+		debug("channel %d: open confirm rwindow %d rmax %d", c->self,
+		    c->remote_window, c->remote_maxpacket);
+	}
+}
+
+char *
+reason2txt(int reason)
+{
+	switch(reason) {
+	case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
+		return "administratively prohibited";
+	case SSH2_OPEN_CONNECT_FAILED:
+		return "connect failed";
+	case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
+		return "unknown channel type";
+	case SSH2_OPEN_RESOURCE_SHORTAGE:
+		return "resource shortage";
+	}
+	return "unknown reason";
+}
+
+void
+channel_input_open_failure(int type, int plen, void *ctxt)
+{
+	int id, reason;
+	char *msg = NULL, *lang = NULL;
+	Channel *c;
+
+	if (!compat20)
+		packet_integrity_check(plen, 4, type);
+
+	id = packet_get_int();
+	c = channel_lookup(id);
+
+	if (c==NULL || c->type != SSH_CHANNEL_OPENING)
+		packet_disconnect("Received open failure for "
+		    "non-opening channel %d.", id);
+	if (compat20) {
+		reason = packet_get_int();
+		if (!(datafellows & SSH_BUG_OPENFAILURE)) {
+			msg  = packet_get_string(NULL);
+			lang = packet_get_string(NULL);
+		}
+		packet_done();
+		log("channel %d: open failed: %s%s%s", id,
+		    reason2txt(reason), msg ? ": ": "", msg ? msg : "");
+		if (msg != NULL)
+			xfree(msg);
+		if (lang != NULL)
+			xfree(lang);
+	}
+	/* Free the channel.  This will also close the socket. */
+	channel_free(c);
+}
+
+void
+channel_input_channel_request(int type, int plen, void *ctxt)
+{
+	int id;
+	Channel *c;
+
+	id = packet_get_int();
+	c = channel_lookup(id);
+
+	if (c == NULL ||
+	    (c->type != SSH_CHANNEL_OPEN && c->type != SSH_CHANNEL_LARVAL))
+		packet_disconnect("Received request for "
+		    "non-open channel %d.", id);
+	if (c->cb_fn != NULL && c->cb_event == type) {
+		debug2("callback start");
+		c->cb_fn(c->self, c->cb_arg);
+		debug2("callback done");
+	} else {
+		char *service = packet_get_string(NULL);
+		debug("channel %d: rcvd request for %s", c->self, service);
+		debug("cb_fn %p cb_event %d", c->cb_fn , c->cb_event);
+		xfree(service);
+	}
+}
+
+void
+channel_input_window_adjust(int type, int plen, void *ctxt)
+{
+	Channel *c;
+	int id, adjust;
+
+	if (!compat20)
+		return;
+
+	/* Get the channel number and verify it. */
+	id = packet_get_int();
+	c = channel_lookup(id);
+
+	if (c == NULL || c->type != SSH_CHANNEL_OPEN) {
+		log("Received window adjust for "
+		    "non-open channel %d.", id);
+		return;
+	}
+	adjust = packet_get_int();
+	packet_done();
+	debug2("channel %d: rcvd adjust %d", id, adjust);
+	c->remote_window += adjust;
+}
+
+void
+channel_input_port_open(int type, int plen, void *ctxt)
+{
+	Channel *c = NULL;
+	u_short host_port;
+	char *host, *originator_string;
+	int remote_id, sock = -1;
+
+	remote_id = packet_get_int();
+	host = packet_get_string(NULL);
+	host_port = packet_get_int();
+
+	if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
+		originator_string = packet_get_string(NULL);
+	} else {
+		originator_string = xstrdup("unknown (remote did not supply name)");
+	}
+	packet_done();
+	sock = channel_connect_to(host, host_port);
+	if (sock != -1) {
+		c = channel_new("connected socket",
+		    SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0,
+		    originator_string, 1);
+		if (c == NULL) {
+			error("channel_input_port_open: channel_new failed");
+			close(sock);
+		} else {
+			c->remote_id = remote_id;
+		}
+	}
+	if (c == NULL) {
+		packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
+		packet_put_int(remote_id);
+		packet_send();
+	}
+	xfree(host);
+}
diff --git a/usr.bin/ssh/channel-tcpfwd.c b/usr.bin/ssh/channel-tcpfwd.c
new file mode 100644
index 00000000000..6bc03fa8e39
--- /dev/null
+++ b/usr.bin/ssh/channel-tcpfwd.c
@@ -0,0 +1,407 @@
+/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ *                    All rights reserved
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose.  Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ *
+ *
+ * Copyright (c) 2001 Markus Friedl.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "includes.h"
+RCSID("$OpenBSD: channel-tcpfwd.c,v 1.1 2001/05/30 12:55:08 markus Exp $");
+
+#include "ssh.h"
+#include "ssh1.h"
+#include "ssh2.h"
+#include "packet.h"
+#include "xmalloc.h"
+#include "log.h"
+#include "channel.h"
+#include "compat.h"
+
+/*
+ * Data structure for storing which hosts are permitted for forward requests.
+ * The local sides of any remote forwards are stored in this array to prevent
+ * a corrupt remote server from accessing arbitrary TCP/IP ports on our local
+ * network (which might be behind a firewall).
+ */
+typedef struct {
+	char *host_to_connect;		/* Connect to 'host'. */
+	u_short port_to_connect;	/* Connect to 'port'. */
+	u_short listen_port;		/* Remote side should listen port number. */
+} ForwardPermission;
+
+/* List of all permitted host/port pairs to connect. */
+static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION];
+
+/* Number of permitted host/port pairs in the array. */
+static int num_permitted_opens = 0;
+/*
+ * If this is true, all opens are permitted.  This is the case on the server
+ * on which we have to trust the client anyway, and the user could do
+ * anything after logging in anyway.
+ */
+static int all_opens_permitted = 0;
+
+/* AF_UNSPEC or AF_INET or AF_INET6 */
+extern int IPv4or6;
+
+/*
+ * Initiate forwarding of connections to local port "port" through the secure
+ * channel to host:port from remote side.
+ */
+int
+channel_request_local_forwarding(u_short listen_port, const char *host_to_connect,
+    u_short port_to_connect, int gateway_ports)
+{
+	return channel_request_forwarding(
+	    NULL, listen_port,
+	    host_to_connect, port_to_connect,
+	    gateway_ports, /*remote_fwd*/ 0);
+}
+
+/*
+ * If 'remote_fwd' is true we have a '-R style' listener for protocol 2
+ * (SSH_CHANNEL_RPORT_LISTENER).
+ */
+int
+channel_request_forwarding(
+    const char *listen_address, u_short listen_port,
+    const char *host_to_connect, u_short port_to_connect,
+    int gateway_ports, int remote_fwd)
+{
+	Channel *c;
+	int success, sock, on = 1, ctype;
+	struct addrinfo hints, *ai, *aitop;
+	char ntop[NI_MAXHOST], strport[NI_MAXSERV];
+	const char *host;
+	struct linger linger;
+
+	success = 0;
+
+	if (remote_fwd) {
+		host = listen_address;
+		ctype = SSH_CHANNEL_RPORT_LISTENER;
+	} else {
+		host = host_to_connect;
+		ctype  =SSH_CHANNEL_PORT_LISTENER;
+	}
+
+	if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) {
+		error("Forward host name too long.");
+		return success;
+	}
+
+	/* XXX listen_address is currently ignored */
+	/*
+	 * getaddrinfo returns a loopback address if the hostname is
+	 * set to NULL and hints.ai_flags is not AI_PASSIVE
+	 */
+	memset(&hints, 0, sizeof(hints));
+	hints.ai_family = IPv4or6;
+	hints.ai_flags = gateway_ports ? AI_PASSIVE : 0;
+	hints.ai_socktype = SOCK_STREAM;
+	snprintf(strport, sizeof strport, "%d", listen_port);
+	if (getaddrinfo(NULL, strport, &hints, &aitop) != 0)
+		packet_disconnect("getaddrinfo: fatal error");
+
+	for (ai = aitop; ai; ai = ai->ai_next) {
+		if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
+			continue;
+		if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
+		    strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
+			error("channel_request_forwarding: getnameinfo failed");
+			continue;
+		}
+		/* Create a port to listen for the host. */
+		sock = socket(ai->ai_family, SOCK_STREAM, 0);
+		if (sock < 0) {
+			/* this is no error since kernel may not support ipv6 */
+			verbose("socket: %.100s", strerror(errno));
+			continue;
+		}
+		/*
+		 * Set socket options.  We would like the socket to disappear
+		 * as soon as it has been closed for whatever reason.
+		 */
+		setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on));
+		linger.l_onoff = 1;
+		linger.l_linger = 5;
+		setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&linger, sizeof(linger));
+		debug("Local forwarding listening on %s port %s.", ntop, strport);
+
+		/* Bind the socket to the address. */
+		if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
+			/* address can be in use ipv6 address is already bound */
+			verbose("bind: %.100s", strerror(errno));
+			close(sock);
+			continue;
+		}
+		/* Start listening for connections on the socket. */
+		if (listen(sock, 5) < 0) {
+			error("listen: %.100s", strerror(errno));
+			close(sock);
+			continue;
+		}
+		/* Allocate a channel number for the socket. */
+		c = channel_new("port listener", ctype, sock, sock, -1,
+		    CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
+		    0, xstrdup("port listener"), 1);
+		if (c == NULL) {
+			error("channel_request_forwarding: channel_new failed");
+			close(sock);
+			continue;
+		}
+		strlcpy(c->path, host, sizeof(c->path));
+		c->host_port = port_to_connect;
+		c->listening_port = listen_port;
+		success = 1;
+	}
+	if (success == 0)
+		error("channel_request_forwarding: cannot listen to port: %d",
+		    listen_port);
+	freeaddrinfo(aitop);
+	return success;
+}
+
+/*
+ * Initiate forwarding of connections to port "port" on remote host through
+ * the secure channel to host:port from local side.
+ */
+
+void
+channel_request_remote_forwarding(u_short listen_port,
+    const char *host_to_connect, u_short port_to_connect)
+{
+	int payload_len, type, success = 0;
+
+	/* Record locally that connection to this host/port is permitted. */
+	if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
+		fatal("channel_request_remote_forwarding: too many forwards");
+
+	/* Send the forward request to the remote side. */
+	if (compat20) {
+		const char *address_to_bind = "0.0.0.0";
+		packet_start(SSH2_MSG_GLOBAL_REQUEST);
+		packet_put_cstring("tcpip-forward");
+		packet_put_char(0);			/* boolean: want reply */
+		packet_put_cstring(address_to_bind);
+		packet_put_int(listen_port);
+		packet_send();
+		packet_write_wait();
+		/* Assume that server accepts the request */
+		success = 1;
+	} else {
+		packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
+		packet_put_int(listen_port);
+		packet_put_cstring(host_to_connect);
+		packet_put_int(port_to_connect);
+		packet_send();
+		packet_write_wait();
+
+		/* Wait for response from the remote side. */
+		type = packet_read(&payload_len);
+		switch (type) {
+		case SSH_SMSG_SUCCESS:
+			success = 1;
+			break;
+		case SSH_SMSG_FAILURE:
+			log("Warning: Server denied remote port forwarding.");
+			break;
+		default:
+			/* Unknown packet */
+			packet_disconnect("Protocol error for port forward request:"
+			    "received packet type %d.", type);
+		}
+	}
+	if (success) {
+		permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect);
+		permitted_opens[num_permitted_opens].port_to_connect = port_to_connect;
+		permitted_opens[num_permitted_opens].listen_port = listen_port;
+		num_permitted_opens++;
+	}
+}
+
+/*
+ * This is called after receiving CHANNEL_FORWARDING_REQUEST.  This initates
+ * listening for the port, and sends back a success reply (or disconnect
+ * message if there was an error).  This never returns if there was an error.
+ */
+
+void
+channel_input_port_forward_request(int is_root, int gateway_ports)
+{
+	u_short port, host_port;
+	char *hostname;
+
+	/* Get arguments from the packet. */
+	port = packet_get_int();
+	hostname = packet_get_string(NULL);
+	host_port = packet_get_int();
+
+	/*
+	 * Check that an unprivileged user is not trying to forward a
+	 * privileged port.
+	 */
+	if (port < IPPORT_RESERVED && !is_root)
+		packet_disconnect("Requested forwarding of port %d but user is not root.",
+				  port);
+	/* Initiate forwarding */
+	channel_request_local_forwarding(port, hostname, host_port, gateway_ports);
+
+	/* Free the argument string. */
+	xfree(hostname);
+}
+
+/*
+ * Permits opening to any host/port if permitted_opens[] is empty.  This is
+ * usually called by the server, because the user could connect to any port
+ * anyway, and the server has no way to know but to trust the client anyway.
+ */
+void
+channel_permit_all_opens()
+{
+	if (num_permitted_opens == 0)
+		all_opens_permitted = 1;
+}
+
+void
+channel_add_permitted_opens(char *host, int port)
+{
+	if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
+		fatal("channel_request_remote_forwarding: too many forwards");
+	debug("allow port forwarding to host %s port %d", host, port);
+
+	permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
+	permitted_opens[num_permitted_opens].port_to_connect = port;
+	num_permitted_opens++;
+
+	all_opens_permitted = 0;
+}
+
+void
+channel_clear_permitted_opens(void)
+{
+	int i;
+
+	for (i = 0; i < num_permitted_opens; i++)
+		xfree(permitted_opens[i].host_to_connect);
+	num_permitted_opens = 0;
+
+}
+
+
+/* return socket to remote host, port */
+int
+connect_to(const char *host, u_short port)
+{
+	struct addrinfo hints, *ai, *aitop;
+	char ntop[NI_MAXHOST], strport[NI_MAXSERV];
+	int gaierr;
+	int sock = -1;
+
+	memset(&hints, 0, sizeof(hints));
+	hints.ai_family = IPv4or6;
+	hints.ai_socktype = SOCK_STREAM;
+	snprintf(strport, sizeof strport, "%d", port);
+	if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
+		error("connect_to %.100s: unknown host (%s)", host,
+		    gai_strerror(gaierr));
+		return -1;
+	}
+	for (ai = aitop; ai; ai = ai->ai_next) {
+		if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
+			continue;
+		if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
+		    strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
+			error("connect_to: getnameinfo failed");
+			continue;
+		}
+		sock = socket(ai->ai_family, SOCK_STREAM, 0);
+		if (sock < 0) {
+			error("socket: %.100s", strerror(errno));
+			continue;
+		}
+		if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0)
+			fatal("connect_to: F_SETFL: %s", strerror(errno));
+		if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 &&
+		    errno != EINPROGRESS) {
+			error("connect_to %.100s port %s: %.100s", ntop, strport,
+			    strerror(errno));
+			close(sock);
+			continue;	/* fail -- try next */
+		}
+		break; /* success */
+
+	}
+	freeaddrinfo(aitop);
+	if (!ai) {
+		error("connect_to %.100s port %d: failed.", host, port);
+		return -1;
+	}
+	/* success */
+	return sock;
+}
+
+int
+channel_connect_by_listen_adress(u_short listen_port)
+{
+	int i;
+
+	for (i = 0; i < num_permitted_opens; i++)
+		if (permitted_opens[i].listen_port == listen_port)
+			return connect_to(
+			    permitted_opens[i].host_to_connect,
+			    permitted_opens[i].port_to_connect);
+	error("WARNING: Server requests forwarding for unknown listen_port %d",
+	    listen_port);
+	return -1;
+}
+
+/* Check if connecting to that port is permitted and connect. */
+int
+channel_connect_to(const char *host, u_short port)
+{
+	int i, permit;
+
+	permit = all_opens_permitted;
+	if (!permit) {
+		for (i = 0; i < num_permitted_opens; i++)
+			if (permitted_opens[i].port_to_connect == port &&
+			    strcmp(permitted_opens[i].host_to_connect, host) == 0)
+				permit = 1;
+
+	}
+	if (!permit) {
+		log("Received request to connect to host %.100s port %d, "
+		    "but the request was denied.", host, port);
+		return -1;
+	}
+	return connect_to(host, port);
+}
diff --git a/usr.bin/ssh/channel-x11.c b/usr.bin/ssh/channel-x11.c
new file mode 100644
index 00000000000..349a4a82072
--- /dev/null
+++ b/usr.bin/ssh/channel-x11.c
@@ -0,0 +1,492 @@
+/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ *                    All rights reserved
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose.  Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ *
+ *
+ * Copyright (c) 2001 Markus Friedl.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "includes.h"
+RCSID("$OpenBSD: channel-x11.c,v 1.1 2001/05/30 12:55:08 markus Exp $");
+
+#include "ssh1.h"
+#include "packet.h"
+#include "xmalloc.h"
+#include "log.h"
+#include "compat.h"
+#include "channel.h"
+
+/* Maximum number of fake X11 displays to try. */
+#define MAX_DISPLAYS  1000
+
+/* Saved X11 authentication protocol name. */
+char *x11_saved_proto = NULL;
+
+/* Saved X11 authentication data.  This is the real data. */
+char *x11_saved_data = NULL;
+u_int x11_saved_data_len = 0;
+
+/*
+ * Fake X11 authentication data.  This is what the server will be sending us;
+ * we should replace any occurrences of this by the real data.
+ */
+char *x11_fake_data = NULL;
+u_int x11_fake_data_len;
+
+extern int IPv4or6;
+
+#define	NUM_SOCKS	10
+
+/*
+ * This is a special state for X11 authentication spoofing.  An opened X11
+ * connection (when authentication spoofing is being done) remains in this
+ * state until the first packet has been completely read.  The authentication
+ * data in that packet is then substituted by the real data if it matches the
+ * fake data, and the channel is put into normal mode.
+ * XXX All this happens at the client side.
+ * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
+ */
+int
+x11_check_cookie(Buffer *b)
+{
+	u_char *ucp;
+	u_int proto_len, data_len;
+
+	/* Check if the fixed size part of the packet is in buffer. */
+	if (buffer_len(b) < 12)
+		return 0;
+
+	/* Parse the lengths of variable-length fields. */
+	ucp = (u_char *) buffer_ptr(b);
+	if (ucp[0] == 0x42) {	/* Byte order MSB first. */
+		proto_len = 256 * ucp[6] + ucp[7];
+		data_len = 256 * ucp[8] + ucp[9];
+	} else if (ucp[0] == 0x6c) {	/* Byte order LSB first. */
+		proto_len = ucp[6] + 256 * ucp[7];
+		data_len = ucp[8] + 256 * ucp[9];
+	} else {
+		debug("Initial X11 packet contains bad byte order byte: 0x%x",
+		      ucp[0]);
+		return -1;
+	}
+
+	/* Check if the whole packet is in buffer. */
+	if (buffer_len(b) <
+	    12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
+		return 0;
+
+	/* Check if authentication protocol matches. */
+	if (proto_len != strlen(x11_saved_proto) ||
+	    memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
+		debug("X11 connection uses different authentication protocol.");
+		return -1;
+	}
+	/* Check if authentication data matches our fake data. */
+	if (data_len != x11_fake_data_len ||
+	    memcmp(ucp + 12 + ((proto_len + 3) & ~3),
+		x11_fake_data, x11_fake_data_len) != 0) {
+		debug("X11 auth data does not match fake data.");
+		return -1;
+	}
+	/* Check fake data length */
+	if (x11_fake_data_len != x11_saved_data_len) {
+		error("X11 fake_data_len %d != saved_data_len %d",
+		    x11_fake_data_len, x11_saved_data_len);
+		return -1;
+	}
+	/*
+	 * Received authentication protocol and data match
+	 * our fake data. Substitute the fake data with real
+	 * data.
+	 */
+	memcpy(ucp + 12 + ((proto_len + 3) & ~3),
+	    x11_saved_data, x11_saved_data_len);
+	return 1;
+}
+
+/*
+ * Creates an internet domain socket for listening for X11 connections.
+ * Returns a suitable value for the DISPLAY variable, or NULL if an error
+ * occurs.
+ */
+char *
+x11_create_display_inet(int screen_number, int x11_display_offset)
+{
+	int display_number, sock;
+	u_short port;
+	struct addrinfo hints, *ai, *aitop;
+	char strport[NI_MAXSERV];
+	int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
+	char display[512];
+	char hostname[MAXHOSTNAMELEN];
+
+	for (display_number = x11_display_offset;
+	     display_number < MAX_DISPLAYS;
+	     display_number++) {
+		port = 6000 + display_number;
+		memset(&hints, 0, sizeof(hints));
+		hints.ai_family = IPv4or6;
+		hints.ai_flags = AI_PASSIVE;		/* XXX loopback only ? */
+		hints.ai_socktype = SOCK_STREAM;
+		snprintf(strport, sizeof strport, "%d", port);
+		if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
+			error("getaddrinfo: %.100s", gai_strerror(gaierr));
+			return NULL;
+		}
+		for (ai = aitop; ai; ai = ai->ai_next) {
+			if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
+				continue;
+			sock = socket(ai->ai_family, SOCK_STREAM, 0);
+			if (sock < 0) {
+				error("socket: %.100s", strerror(errno));
+				return NULL;
+			}
+			if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
+				debug("bind port %d: %.100s", port, strerror(errno));
+				shutdown(sock, SHUT_RDWR);
+				close(sock);
+				for (n = 0; n < num_socks; n++) {
+					shutdown(socks[n], SHUT_RDWR);
+					close(socks[n]);
+				}
+				num_socks = 0;
+				break;
+			}
+			socks[num_socks++] = sock;
+			if (num_socks == NUM_SOCKS)
+				break;
+		}
+		freeaddrinfo(aitop);
+		if (num_socks > 0)
+			break;
+	}
+	if (display_number >= MAX_DISPLAYS) {
+		error("Failed to allocate internet-domain X11 display socket.");
+		return NULL;
+	}
+	/* Start listening for connections on the socket. */
+	for (n = 0; n < num_socks; n++) {
+		sock = socks[n];
+		if (listen(sock, 5) < 0) {
+			error("listen: %.100s", strerror(errno));
+			shutdown(sock, SHUT_RDWR);
+			close(sock);
+			return NULL;
+		}
+	}
+
+	/* Set up a suitable value for the DISPLAY variable. */
+	if (gethostname(hostname, sizeof(hostname)) < 0)
+		fatal("gethostname: %.100s", strerror(errno));
+	snprintf(display, sizeof display, "%.400s:%d.%d", hostname,
+		 display_number, screen_number);
+
+	/* Allocate a channel for each socket. */
+	for (n = 0; n < num_socks; n++) {
+		sock = socks[n];
+		(void) channel_new("x11 listener",
+		    SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
+		    CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
+		    0, xstrdup("X11 inet listener"), 1);
+	}
+
+	/* Return a suitable value for the DISPLAY environment variable. */
+	return xstrdup(display);
+}
+
+#ifndef X_UNIX_PATH
+#define X_UNIX_PATH "/tmp/.X11-unix/X"
+#endif
+
+static
+int
+connect_local_xsocket(u_int dnr)
+{
+	static const char *const x_sockets[] = {
+		X_UNIX_PATH "%u",
+		"/var/X/.X11-unix/X" "%u",
+		"/usr/spool/sockets/X11/" "%u",
+		NULL
+	};
+	int sock;
+	struct sockaddr_un addr;
+	const char *const * path;
+
+	for (path = x_sockets; *path; ++path) {
+		sock = socket(AF_UNIX, SOCK_STREAM, 0);
+		if (sock < 0)
+			error("socket: %.100s", strerror(errno));
+		memset(&addr, 0, sizeof(addr));
+		addr.sun_family = AF_UNIX;
+		snprintf(addr.sun_path, sizeof addr.sun_path, *path, dnr);
+		if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0)
+			return sock;
+		close(sock);
+	}
+	error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
+	return -1;
+}
+
+int
+x11_connect_display(void)
+{
+	int display_number, sock = 0;
+	const char *display;
+	char buf[1024], *cp;
+	struct addrinfo hints, *ai, *aitop;
+	char strport[NI_MAXSERV];
+	int gaierr;
+
+	/* Try to open a socket for the local X server. */
+	display = getenv("DISPLAY");
+	if (!display) {
+		error("DISPLAY not set.");
+		return -1;
+	}
+	/*
+	 * Now we decode the value of the DISPLAY variable and make a
+	 * connection to the real X server.
+	 */
+
+	/*
+	 * Check if it is a unix domain socket.  Unix domain displays are in
+	 * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
+	 */
+	if (strncmp(display, "unix:", 5) == 0 ||
+	    display[0] == ':') {
+		/* Connect to the unix domain socket. */
+		if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) {
+			error("Could not parse display number from DISPLAY: %.100s",
+			      display);
+			return -1;
+		}
+		/* Create a socket. */
+		sock = connect_local_xsocket(display_number);
+		if (sock < 0)
+			return -1;
+
+		/* OK, we now have a connection to the display. */
+		return sock;
+	}
+	/*
+	 * Connect to an inet socket.  The DISPLAY value is supposedly
+	 * hostname:d[.s], where hostname may also be numeric IP address.
+	 */
+	strncpy(buf, display, sizeof(buf));
+	buf[sizeof(buf) - 1] = 0;
+	cp = strchr(buf, ':');
+	if (!cp) {
+		error("Could not find ':' in DISPLAY: %.100s", display);
+		return -1;
+	}
+	*cp = 0;
+	/* buf now contains the host name.  But first we parse the display number. */
+	if (sscanf(cp + 1, "%d", &display_number) != 1) {
+		error("Could not parse display number from DISPLAY: %.100s",
+		      display);
+		return -1;
+	}
+
+	/* Look up the host address */
+	memset(&hints, 0, sizeof(hints));
+	hints.ai_family = IPv4or6;
+	hints.ai_socktype = SOCK_STREAM;
+	snprintf(strport, sizeof strport, "%d", 6000 + display_number);
+	if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
+		error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr));
+		return -1;
+	}
+	for (ai = aitop; ai; ai = ai->ai_next) {
+		/* Create a socket. */
+		sock = socket(ai->ai_family, SOCK_STREAM, 0);
+		if (sock < 0) {
+			debug("socket: %.100s", strerror(errno));
+			continue;
+		}
+		/* Connect it to the display. */
+		if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
+			debug("connect %.100s port %d: %.100s", buf,
+			    6000 + display_number, strerror(errno));
+			close(sock);
+			continue;
+		}
+		/* Success */
+		break;
+	}
+	freeaddrinfo(aitop);
+	if (!ai) {
+		error("connect %.100s port %d: %.100s", buf, 6000 + display_number,
+		    strerror(errno));
+		return -1;
+	}
+	return sock;
+}
+
+/*
+ * This is called when SSH_SMSG_X11_OPEN is received.  The packet contains
+ * the remote channel number.  We should do whatever we want, and respond
+ * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
+ */
+
+void
+x11_input_open(int type, int plen, void *ctxt)
+{
+	Channel *c = NULL;
+	int remote_id, sock = 0;
+	char *remote_host;
+
+	debug("Received X11 open request.");
+
+	remote_id = packet_get_int();
+
+	if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
+		remote_host = packet_get_string(NULL);
+	} else {
+		remote_host = xstrdup("unknown (remote did not supply name)");
+	}
+	packet_done();
+
+	/* Obtain a connection to the real X display. */
+	sock = x11_connect_display();
+	if (sock != -1) {
+		/* Allocate a channel for this connection. */
+		c = channel_new("connected x11 socket",
+		    SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
+		    remote_host, 1);
+		if (c == NULL) {
+			error("x11_input_open: channel_new failed");
+			close(sock);
+		} else {
+			c->remote_id = remote_id;
+		}
+	}
+	if (c == NULL) {
+		/* Send refusal to the remote host. */
+		packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
+		packet_put_int(remote_id);
+	} else {
+		/* Send a confirmation to the remote host. */
+		packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
+		packet_put_int(remote_id);
+		packet_put_int(c->self);
+	}
+	packet_send();
+}
+
+/* dummy protocol handler that denies SSH-1 requests (agent/x11) */
+void
+deny_input_open(int type, int plen, void *ctxt)
+{
+	int rchan = packet_get_int();
+	switch(type){
+	case SSH_SMSG_AGENT_OPEN:
+		error("Warning: ssh server tried agent forwarding.");
+		break;
+	case SSH_SMSG_X11_OPEN:
+		error("Warning: ssh server tried X11 forwarding.");
+		break;
+	default:
+		error("deny_input_open: type %d plen %d", type, plen);
+		break;
+	}
+	error("Warning: this is probably a break in attempt by a malicious server.");
+	packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
+	packet_put_int(rchan);
+	packet_send();
+}
+
+/*
+ * Requests forwarding of X11 connections, generates fake authentication
+ * data, and enables authentication spoofing.
+ * This should be called in the client only.
+ */
+void
+x11_request_forwarding_with_spoofing(int client_session_id,
+    const char *proto, const char *data)
+{
+	u_int data_len = (u_int) strlen(data) / 2;
+	u_int i, value, len;
+	char *new_data;
+	int screen_number;
+	const char *cp;
+	u_int32_t rand = 0;
+
+	cp = getenv("DISPLAY");
+	if (cp)
+		cp = strchr(cp, ':');
+	if (cp)
+		cp = strchr(cp, '.');
+	if (cp)
+		screen_number = atoi(cp + 1);
+	else
+		screen_number = 0;
+
+	/* Save protocol name. */
+	x11_saved_proto = xstrdup(proto);
+
+	/*
+	 * Extract real authentication data and generate fake data of the
+	 * same length.
+	 */
+	x11_saved_data = xmalloc(data_len);
+	x11_fake_data = xmalloc(data_len);
+	for (i = 0; i < data_len; i++) {
+		if (sscanf(data + 2 * i, "%2x", &value) != 1)
+			fatal("x11_request_forwarding: bad authentication data: %.100s", data);
+		if (i % 4 == 0)
+			rand = arc4random();
+		x11_saved_data[i] = value;
+		x11_fake_data[i] = rand & 0xff;
+		rand >>= 8;
+	}
+	x11_saved_data_len = data_len;
+	x11_fake_data_len = data_len;
+
+	/* Convert the fake data into hex. */
+	len = 2 * data_len + 1;
+	new_data = xmalloc(len);
+	for (i = 0; i < data_len; i++)
+		snprintf(new_data + 2 * i, len - 2 * i,
+		    "%02x", (u_char) x11_fake_data[i]);
+
+	/* Send the request packet. */
+	if (compat20) {
+		channel_request_start(client_session_id, "x11-req", 0);
+		packet_put_char(0);	/* XXX bool single connection */
+	} else {
+		packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
+	}
+	packet_put_cstring(proto);
+	packet_put_cstring(new_data);
+	packet_put_int(screen_number);
+	packet_send();
+	packet_write_wait();
+	xfree(new_data);
+}
diff --git a/usr.bin/ssh/channel.c b/usr.bin/ssh/channel.c
new file mode 100644
index 00000000000..ddacf0bf89d
--- /dev/null
+++ b/usr.bin/ssh/channel.c
@@ -0,0 +1,582 @@
+/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ *                    All rights reserved
+ * This file contains functions for generic socket connection forwarding.
+ * There is also code for initiating connection forwarding for X11 connections,
+ * arbitrary tcp/ip connections, and the authentication agent connection.
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose.  Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ *
+ *
+ * SSH2 support added by Markus Friedl.
+ * Copyright (c) 1999,2000 Markus Friedl.  All rights reserved.
+ * Copyright (c) 1999 Dug Song.  All rights reserved.
+ * Copyright (c) 1999 Theo de Raadt.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "includes.h"
+RCSID("$OpenBSD: channel.c,v 1.1 2001/05/30 12:55:08 markus Exp $");
+
+#include "ssh2.h"
+#include "packet.h"
+#include "xmalloc.h"
+#include "log.h"
+#include "misc.h"
+#include "channel.h"
+#include "compat.h"
+
+/*
+ * Pointer to an array containing all allocated channels.  The array is
+ * dynamically extended as needed.
+ */
+Channel **channels = NULL;
+
+/*
+ * Size of the channel array.  All slots of the array must always be
+ * initialized (at least the type field); unused slots set to NULL
+ */
+int channels_alloc = 0;
+
+/*
+ * Maximum file descriptor value used in any of the channels.  This is
+ * updated in channel_new.
+ */
+int channel_max_fd = 0;
+
+
+Channel *
+channel_lookup(int id)
+{
+	Channel *c;
+
+	if (id < 0 || id > channels_alloc) {
+		log("channel_lookup: %d: bad id", id);
+		return NULL;
+	}
+	c = channels[id];
+	if (c == NULL) {
+		log("channel_lookup: %d: bad id: channel free", id);
+		return NULL;
+	}
+	return c;
+}
+
+/*
+ * Register filedescriptors for a channel, used when allocating a channel or
+ * when the channel consumer/producer is ready, e.g. shell exec'd
+ */
+
+void
+channel_register_fds(Channel *c, int rfd, int wfd, int efd,
+    int extusage, int nonblock)
+{
+	/* Update the maximum file descriptor value. */
+	channel_max_fd = MAX(channel_max_fd, rfd);
+	channel_max_fd = MAX(channel_max_fd, wfd);
+	channel_max_fd = MAX(channel_max_fd, efd);
+
+	/* XXX set close-on-exec -markus */
+
+	c->rfd = rfd;
+	c->wfd = wfd;
+	c->sock = (rfd == wfd) ? rfd : -1;
+	c->efd = efd;
+	c->extended_usage = extusage;
+
+	/* XXX ugly hack: nonblock is only set by the server */
+	if (nonblock && isatty(c->rfd)) {
+		debug("channel %d: rfd %d isatty", c->self, c->rfd);
+		c->isatty = 1;
+		if (!isatty(c->wfd)) {
+			error("channel %d: wfd %d is not a tty?",
+			    c->self, c->wfd);
+		}
+	} else {
+		c->isatty = 0;
+	}
+
+	/* enable nonblocking mode */
+	if (nonblock) {
+		if (rfd != -1)
+			set_nonblock(rfd);
+		if (wfd != -1)
+			set_nonblock(wfd);
+		if (efd != -1)
+			set_nonblock(efd);
+	}
+}
+
+/*
+ * Allocate a new channel object and set its type and socket. This will cause
+ * remote_name to be freed.
+ */
+
+Channel *
+channel_new(char *ctype, int type, int rfd, int wfd, int efd,
+    int window, int maxpack, int extusage, char *remote_name, int nonblock)
+{
+	int i, found;
+	Channel *c;
+
+	/* Do initial allocation if this is the first call. */
+	if (channels_alloc == 0) {
+		chan_init();
+		channels_alloc = 10;
+		channels = xmalloc(channels_alloc * sizeof(Channel *));
+		for (i = 0; i < channels_alloc; i++)
+			channels[i] = NULL;
+		/*
+		 * Kludge: arrange a call to channel_stop_listening if we
+		 * terminate with fatal().
+		 */
+		fatal_add_cleanup((void (*) (void *)) channel_stop_listening, NULL);
+	}
+	/* Try to find a free slot where to put the new channel. */
+	for (found = -1, i = 0; i < channels_alloc; i++)
+		if (channels[i] == NULL) {
+			/* Found a free slot. */
+			found = i;
+			break;
+		}
+	if (found == -1) {
+		/* There are no free slots.  Take last+1 slot and expand the array.  */
+		found = channels_alloc;
+		channels_alloc += 10;
+		debug2("channel: expanding %d", channels_alloc);
+		channels = xrealloc(channels, channels_alloc * sizeof(Channel *));
+		for (i = found; i < channels_alloc; i++)
+			channels[i] = NULL;
+	}
+	/* Initialize and return new channel. */
+	c = channels[found] = xmalloc(sizeof(Channel));
+	buffer_init(&c->input);
+	buffer_init(&c->output);
+	buffer_init(&c->extended);
+	chan_init_iostates(c);
+	channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
+	c->self = found;
+	c->type = type;
+	c->ctype = ctype;
+	c->local_window = window;
+	c->local_window_max = window;
+	c->local_consumed = 0;
+	c->local_maxpacket = maxpack;
+	c->remote_id = -1;
+	c->remote_name = remote_name;
+	c->remote_window = 0;
+	c->remote_maxpacket = 0;
+	c->cb_fn = NULL;
+	c->cb_arg = NULL;
+	c->cb_event = 0;
+	c->dettach_user = NULL;
+	c->input_filter = NULL;
+	debug("channel %d: new [%s]", found, remote_name);
+	return c;
+}
+
+/* Close all channel fd/socket. */
+
+void
+channel_close_fds(Channel *c)
+{
+	debug3("channel_close_fds: channel %d: r %d w %d e %d",
+	    c->self, c->rfd, c->wfd, c->efd);
+
+	if (c->sock != -1) {
+		close(c->sock);
+		c->sock = -1;
+	}
+	if (c->rfd != -1) {
+		close(c->rfd);
+		c->rfd = -1;
+	}
+	if (c->wfd != -1) {
+		close(c->wfd);
+		c->wfd = -1;
+	}
+	if (c->efd != -1) {
+		close(c->efd);
+		c->efd = -1;
+	}
+}
+
+/* Free the channel and close its fd/socket. */
+
+void
+channel_free(Channel *c)
+{
+	char *s;
+	int i, n;
+
+	for (n = 0, i = 0; i < channels_alloc; i++)
+		if (channels[i])
+			n++;
+	debug("channel_free: channel %d: %s, nchannels %d", c->self,
+	    c->remote_name ? c->remote_name : "???", n);
+
+	s = channel_open_message();
+	debug3("channel_free: status: %s", s);
+	xfree(s);
+
+	if (c->dettach_user != NULL) {
+		debug("channel_free: channel %d: dettaching channel user", c->self);
+		c->dettach_user(c->self, NULL);
+	}
+	if (c->sock != -1)
+		shutdown(c->sock, SHUT_RDWR);
+	channel_close_fds(c);
+	buffer_free(&c->input);
+	buffer_free(&c->output);
+	buffer_free(&c->extended);
+	if (c->remote_name) {
+		xfree(c->remote_name);
+		c->remote_name = NULL;
+	}
+	channels[c->self] = NULL;
+	xfree(c);
+}
+
+
+/*
+ * Stops listening for channels, and removes any unix domain sockets that we
+ * might have.
+ */
+
+void
+channel_stop_listening()
+{
+	int i;
+	Channel *c;
+
+	for (i = 0; i < channels_alloc; i++) {
+		c = channels[i];
+		if (c != NULL) {
+			switch (c->type) {
+			case SSH_CHANNEL_AUTH_SOCKET:
+				close(c->sock);
+				unlink(c->path);
+				channel_free(c);
+				break;
+			case SSH_CHANNEL_PORT_LISTENER:
+			case SSH_CHANNEL_RPORT_LISTENER:
+			case SSH_CHANNEL_X11_LISTENER:
+				close(c->sock);
+				channel_free(c);
+				break;
+			default:
+				break;
+			}
+		}
+	}
+}
+
+/*
+ * Closes the sockets/fds of all channels.  This is used to close extra file
+ * descriptors after a fork.
+ */
+
+void
+channel_close_all()
+{
+	int i;
+
+	for (i = 0; i < channels_alloc; i++)
+		if (channels[i] != NULL)
+			channel_close_fds(channels[i]);
+}
+
+/*
+ * Returns true if no channel has too much buffered data, and false if one or
+ * more channel is overfull.
+ */
+
+int
+channel_not_very_much_buffered_data()
+{
+	u_int i;
+	Channel *c;
+
+	for (i = 0; i < channels_alloc; i++) {
+		c = channels[i];
+		if (c != NULL && c->type == SSH_CHANNEL_OPEN) {
+			if (!compat20 && buffer_len(&c->input) > packet_get_maxsize()) {
+				debug("channel %d: big input buffer %d",
+				    c->self, buffer_len(&c->input));
+				return 0;
+			}
+			if (buffer_len(&c->output) > packet_get_maxsize()) {
+				debug("channel %d: big output buffer %d",
+				    c->self, buffer_len(&c->output));
+				return 0;
+			}
+		}
+	}
+	return 1;
+}
+
+/* Returns true if any channel is still open. */
+
+int
+channel_still_open()
+{
+	int i;
+	Channel *c;
+
+	for (i = 0; i < channels_alloc; i++) {
+		c = channels[i];
+		if (c == NULL)
+			continue;
+		switch (c->type) {
+		case SSH_CHANNEL_X11_LISTENER:
+		case SSH_CHANNEL_PORT_LISTENER:
+		case SSH_CHANNEL_RPORT_LISTENER:
+		case SSH_CHANNEL_CLOSED:
+		case SSH_CHANNEL_AUTH_SOCKET:
+		case SSH_CHANNEL_DYNAMIC:
+		case SSH_CHANNEL_CONNECTING:
+		case SSH_CHANNEL_ZOMBIE:
+			continue;
+		case SSH_CHANNEL_LARVAL:
+			if (!compat20)
+				fatal("cannot happen: SSH_CHANNEL_LARVAL");
+			continue;
+		case SSH_CHANNEL_OPENING:
+		case SSH_CHANNEL_OPEN:
+		case SSH_CHANNEL_X11_OPEN:
+			return 1;
+		case SSH_CHANNEL_INPUT_DRAINING:
+		case SSH_CHANNEL_OUTPUT_DRAINING:
+			if (!compat13)
+				fatal("cannot happen: OUT_DRAIN");
+			return 1;
+		default:
+			fatal("channel_still_open: bad channel type %d", c->type);
+			/* NOTREACHED */
+		}
+	}
+	return 0;
+}
+
+/* Returns the id of an open channel suitable for keepaliving */
+
+int
+channel_find_open()
+{
+	int i;
+	Channel *c;
+
+	for (i = 0; i < channels_alloc; i++) {
+		c = channels[i];
+		if (c == NULL)
+			continue;
+		switch (c->type) {
+		case SSH_CHANNEL_CLOSED:
+		case SSH_CHANNEL_DYNAMIC:
+		case SSH_CHANNEL_X11_LISTENER:
+		case SSH_CHANNEL_PORT_LISTENER:
+		case SSH_CHANNEL_RPORT_LISTENER:
+		case SSH_CHANNEL_OPENING:
+		case SSH_CHANNEL_CONNECTING:
+		case SSH_CHANNEL_ZOMBIE:
+			continue;
+		case SSH_CHANNEL_LARVAL:
+		case SSH_CHANNEL_AUTH_SOCKET:
+		case SSH_CHANNEL_OPEN:
+		case SSH_CHANNEL_X11_OPEN:
+			return i;
+		case SSH_CHANNEL_INPUT_DRAINING:
+		case SSH_CHANNEL_OUTPUT_DRAINING:
+			if (!compat13)
+				fatal("cannot happen: OUT_DRAIN");
+			return i;
+		default:
+			fatal("channel_find_open: bad channel type %d", c->type);
+			/* NOTREACHED */
+		}
+	}
+	return -1;
+}
+
+
+/*
+ * Returns a message describing the currently open forwarded connections,
+ * suitable for sending to the client.  The message contains crlf pairs for
+ * newlines.
+ */
+
+char *
+channel_open_message()
+{
+	Buffer buffer;
+	Channel *c;
+	char buf[1024], *cp;
+	int i;
+
+	buffer_init(&buffer);
+	snprintf(buf, sizeof buf, "The following connections are open:\r\n");
+	buffer_append(&buffer, buf, strlen(buf));
+	for (i = 0; i < channels_alloc; i++) {
+		c = channels[i];
+		if (c == NULL)
+			continue;
+		switch (c->type) {
+		case SSH_CHANNEL_X11_LISTENER:
+		case SSH_CHANNEL_PORT_LISTENER:
+		case SSH_CHANNEL_RPORT_LISTENER:
+		case SSH_CHANNEL_CLOSED:
+		case SSH_CHANNEL_AUTH_SOCKET:
+		case SSH_CHANNEL_ZOMBIE:
+			continue;
+		case SSH_CHANNEL_LARVAL:
+		case SSH_CHANNEL_OPENING:
+		case SSH_CHANNEL_CONNECTING:
+		case SSH_CHANNEL_DYNAMIC:
+		case SSH_CHANNEL_OPEN:
+		case SSH_CHANNEL_X11_OPEN:
+		case SSH_CHANNEL_INPUT_DRAINING:
+		case SSH_CHANNEL_OUTPUT_DRAINING:
+			snprintf(buf, sizeof buf, "  #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d)\r\n",
+			    c->self, c->remote_name,
+			    c->type, c->remote_id,
+			    c->istate, buffer_len(&c->input),
+			    c->ostate, buffer_len(&c->output),
+			    c->rfd, c->wfd);
+			buffer_append(&buffer, buf, strlen(buf));
+			continue;
+		default:
+			fatal("channel_open_message: bad channel type %d", c->type);
+			/* NOTREACHED */
+		}
+	}
+	buffer_append(&buffer, "\0", 1);
+	cp = xstrdup(buffer_ptr(&buffer));
+	buffer_free(&buffer);
+	return cp;
+}
+
+void
+channel_start_open(int id)
+{
+	Channel *c = channel_lookup(id);
+	if (c == NULL) {
+		log("channel_open: %d: bad id", id);
+		return;
+	}
+	debug("send channel open %d", id);
+	packet_start(SSH2_MSG_CHANNEL_OPEN);
+	packet_put_cstring(c->ctype);
+	packet_put_int(c->self);
+	packet_put_int(c->local_window);
+	packet_put_int(c->local_maxpacket);
+}
+void
+channel_open(int id)
+{
+	/* XXX REMOVE ME */
+	channel_start_open(id);
+	packet_send();
+}
+void
+channel_request(int id, char *service, int wantconfirm)
+{
+	channel_request_start(id, service, wantconfirm);
+	packet_send();
+	debug("channel request %d: %s", id, service) ;
+}
+void
+channel_request_start(int id, char *service, int wantconfirm)
+{
+	Channel *c = channel_lookup(id);
+	if (c == NULL) {
+		log("channel_request: %d: bad id", id);
+		return;
+	}
+	packet_start(SSH2_MSG_CHANNEL_REQUEST);
+	packet_put_int(c->remote_id);
+	packet_put_cstring(service);
+	packet_put_char(wantconfirm);
+}
+void
+channel_register_callback(int id, int mtype, channel_callback_fn *fn, void *arg)
+{
+	Channel *c = channel_lookup(id);
+	if (c == NULL) {
+		log("channel_register_callback: %d: bad id", id);
+		return;
+	}
+	c->cb_event = mtype;
+	c->cb_fn = fn;
+	c->cb_arg = arg;
+}
+void
+channel_register_cleanup(int id, channel_callback_fn *fn)
+{
+	Channel *c = channel_lookup(id);
+	if (c == NULL) {
+		log("channel_register_cleanup: %d: bad id", id);
+		return;
+	}
+	c->dettach_user = fn;
+}
+void
+channel_cancel_cleanup(int id)
+{
+	Channel *c = channel_lookup(id);
+	if (c == NULL) {
+		log("channel_cancel_cleanup: %d: bad id", id);
+		return;
+	}
+	c->dettach_user = NULL;
+}
+void
+channel_register_filter(int id, channel_filter_fn *fn)
+{
+	Channel *c = channel_lookup(id);
+	if (c == NULL) {
+		log("channel_register_filter: %d: bad id", id);
+		return;
+	}
+	c->input_filter = fn;
+}
+
+void
+channel_set_fds(int id, int rfd, int wfd, int efd,
+    int extusage, int nonblock)
+{
+	Channel *c = channel_lookup(id);
+	if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
+		fatal("channel_activate for non-larval channel %d.", id);
+	channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
+	c->type = SSH_CHANNEL_OPEN;
+	/* XXX window size? */
+	c->local_window = c->local_window_max = c->local_maxpacket * 2;
+	packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
+	packet_put_int(c->remote_id);
+	packet_put_int(c->local_window);
+	packet_send();
+}
diff --git a/usr.bin/ssh/channels.h b/usr.bin/ssh/channel.h
index 55d31854e2b..b7e57c0760e 100644
--- a/usr.bin/ssh/channels.h
+++ b/usr.bin/ssh/channel.h
@@ -32,10 +32,10 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
-/* RCSID("$OpenBSD: channels.h,v 1.33 2001/05/28 23:14:49 markus Exp $"); */
+/* RCSID("$OpenBSD: channel.h,v 1.1 2001/05/30 12:55:08 markus Exp $"); */
 
-#ifndef CHANNELS_H
-#define CHANNELS_H
+#ifndef CHANNEL_H
+#define CHANNEL_H
 
 #include "buffer.h"
 
@@ -124,6 +124,32 @@ struct Channel {
 #define CHAN_X11_WINDOW_DEFAULT	(4*1024)
 #define CHAN_X11_PACKET_DEFAULT	(CHAN_X11_WINDOW_DEFAULT/2)
 
+/* possible input states */
+#define CHAN_INPUT_OPEN			0x01
+#define CHAN_INPUT_WAIT_DRAIN		0x02
+#define CHAN_INPUT_WAIT_OCLOSE		0x04
+#define CHAN_INPUT_CLOSED		0x08
+
+/* possible output states */
+#define CHAN_OUTPUT_OPEN		0x10
+#define CHAN_OUTPUT_WAIT_DRAIN		0x20
+#define CHAN_OUTPUT_WAIT_IEOF		0x40
+#define CHAN_OUTPUT_CLOSED		0x80
+
+#define CHAN_CLOSE_SENT			0x01
+#define CHAN_CLOSE_RCVD			0x02
+
+
+/* channel management */
+
+Channel	*channel_lookup(int id);
+Channel *
+channel_new(char *ctype, int type, int rfd, int wfd, int efd,
+    int window, int maxpack, int extusage, char *remote_name, int nonblock);
+void
+channel_set_fds(int id, int rfd, int wfd, int efd,
+    int extusage, int nonblock);
+void    channel_free(Channel *c);
 
 void	channel_open(int id);
 void	channel_request(int id, char *service, int wantconfirm);
@@ -132,13 +158,8 @@ void	channel_register_callback(int id, int mtype, channel_callback_fn *fn, void
 void	channel_register_cleanup(int id, channel_callback_fn *fn);
 void	channel_register_filter(int id, channel_filter_fn *fn);
 void	channel_cancel_cleanup(int id);
-Channel	*channel_lookup(int id);
 
-void
-channel_set_fds(int id, int rfd, int wfd, int efd,
-    int extusage, int nonblock);
-
-void	deny_input_open(int type, int plen, void *ctxt);
+/* protocol handler */
 
 void	channel_input_channel_request(int type, int plen, void *ctxt);
 void	channel_input_close(int type, int plen, void *ctxt);
@@ -152,66 +173,22 @@ void	channel_input_open_failure(int type, int plen, void *ctxt);
 void	channel_input_port_open(int type, int plen, void *ctxt);
 void	channel_input_window_adjust(int type, int plen, void *ctxt);
 
-/* Sets specific protocol options. */
-void    channel_set_options(int hostname_in_open);
-
-/*
- * Allocate a new channel object and set its type and socket.  Remote_name
- * must have been allocated with xmalloc; this will free it when the channel
- * is freed.
- */
-Channel *
-channel_new(char *ctype, int type, int rfd, int wfd, int efd,
-    int window, int maxpack, int extended_usage, char *remote_name,
-    int nonblock);
-
-/* Free the channel and close its socket. */
-void    channel_free(Channel *c);
+/* file descriptor handling (read/write) */
 
-/*
- * Allocate/update select bitmasks and add any bits relevant to channels in
- * select bitmasks.
- */
 void
 channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
     int rekeying);
-
-/*
- * After select, perform any appropriate operations for channels which have
- * events pending.
- */
 void    channel_after_select(fd_set * readset, fd_set * writeset);
-
-/* If there is data to send to the connection, send some of it now. */
 void    channel_output_poll(void);
 
-/* Returns true if no channel has too much buffered data. */
 int     channel_not_very_much_buffered_data(void);
-
-/* This closes any sockets that are listening for connections; this removes
-   any unix domain sockets. */
 void    channel_stop_listening(void);
-
-/*
- * Closes the sockets of all channels.  This is used to close extra file
- * descriptors after a fork.
- */
 void    channel_close_all(void);
-
-/* Returns true if there is still an open channel over the connection. */
 int     channel_still_open(void);
-
-/*
- * Returns a string containing a list of all open channels.  The list is
- * suitable for displaying to the user.  It uses crlf instead of newlines.
- * The caller should free the string with xfree.
- */
 char   *channel_open_message(void);
+int	channel_find_open(void);
 
-/*
- * Initiate forwarding of connections to local port "port" through the secure
- * channel to host:port from remote side.
- */
+/* channel_tcpfwd.c */
 int
 channel_request_local_forwarding(u_short listen_port,
     const char *host_to_connect, u_short port_to_connect, int gateway_ports);
@@ -219,95 +196,53 @@ int
 channel_request_forwarding(const char *listen_address, u_short listen_port,
     const char *host_to_connect, u_short port_to_connect, int gateway_ports,
     int remote_fwd);
-
-/*
- * Initiate forwarding of connections to port "port" on remote host through
- * the secure channel to host:port from local side.  This never returns if
- * there was an error.  This registers that open requests for that port are
- * permitted.
- */
 void
 channel_request_remote_forwarding(u_short port, const char *host,
     u_short remote_port);
-
-/*
- * Permits opening to any host/port if permitted_opens[] is empty.  This is
- * usually called by the server, because the user could connect to any port
- * anyway, and the server has no way to know but to trust the client anyway.
- */
 void    channel_permit_all_opens(void);
-
-/* Add host/port to list of allowed targets for port forwarding */
 void	channel_add_permitted_opens(char *host, int port);
-
-/* Flush list */
 void	channel_clear_permitted_opens(void);
-
-/*
- * This is called after receiving CHANNEL_FORWARDING_REQUEST.  This initates
- * listening for the port, and sends back a success reply (or disconnect
- * message if there was an error).  This never returns if there was an error.
- */
 void    channel_input_port_forward_request(int is_root, int gateway_ports);
+int	channel_connect_to(const char *host, u_short host_port);
+int	channel_connect_by_listen_adress(u_short listen_port);
 
-/*
- * Creates a port for X11 connections, and starts listening for it. Returns
- * the display name, or NULL if an error was encountered.
- */
-char   *x11_create_display(int screen);
+/* x11 forwarding */
 
-/*
- * Creates an internet domain socket for listening for X11 connections.
- * Returns a suitable value for the DISPLAY variable, or NULL if an error
- * occurs.
- */
+int	x11_connect_display(void);
+int	x11_check_cookie(Buffer *b);
+char   *x11_create_display(int screen);
 char   *x11_create_display_inet(int screen, int x11_display_offset);
-
-/*
- * This is called when SSH_SMSG_X11_OPEN is received.  The packet contains
- * the remote channel number.  We should do whatever we want, and respond
- * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
- */
 void    x11_input_open(int type, int plen, void *ctxt);
-
-/*
- * Requests forwarding of X11 connections.  This should be called on the
- * client only.
- */
 void    x11_request_forwarding(void);
-
-/*
- * Requests forwarding for X11 connections, with authentication spoofing.
- * This should be called in the client only.
- */
 void
 x11_request_forwarding_with_spoofing(int client_session_id,
     const char *proto, const char *data);
+void	deny_input_open(int type, int plen, void *ctxt);
 
-/* Sends a message to the server to request authentication fd forwarding. */
-void    auth_request_forwarding(void);
+/* agent forwarding */
 
-/*
- * Returns the name of the forwarded authentication socket.  Returns NULL if
- * there is no forwarded authentication socket.  The returned value points to
- * a static buffer.
- */
+void    auth_request_forwarding(void);
 char   *auth_get_socket_name(void);
-
-/*
- * This is called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server.
- * This starts forwarding authentication requests.
- */
 int     auth_input_request_forwarding(struct passwd * pw);
-
-/* This is called to process an SSH_SMSG_AGENT_OPEN message. */
 void    auth_input_open_request(int type, int plen, void *ctxt);
 
-/* XXX */
-int	channel_connect_to(const char *host, u_short host_port);
-int	channel_connect_by_listen_adress(u_short listen_port);
-int	x11_connect_display(void);
+/* channel close */
 
-int	channel_find_open(void);
+typedef void    chan_event_fn(Channel * c);
+
+/* for the input state */
+extern chan_event_fn	*chan_rcvd_oclose;
+extern chan_event_fn	*chan_read_failed;
+extern chan_event_fn	*chan_ibuf_empty;
+
+/* for the output state */
+extern chan_event_fn	*chan_rcvd_ieof;
+extern chan_event_fn	*chan_write_failed;
+extern chan_event_fn	*chan_obuf_empty;
+
+int	chan_is_dead(Channel * c);
+void	chan_mark_dead(Channel * c);
+void    chan_init_iostates(Channel * c);
+void	chan_init(void);
 
 #endif
diff --git a/usr.bin/ssh/channels.c b/usr.bin/ssh/channels.c
deleted file mode 100644
index b465c1cd296..00000000000
--- a/usr.bin/ssh/channels.c
+++ /dev/null
@@ -1,2843 +0,0 @@
-/*
- * Author: Tatu Ylonen <ylo@cs.hut.fi>
- * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
- *                    All rights reserved
- * This file contains functions for generic socket connection forwarding.
- * There is also code for initiating connection forwarding for X11 connections,
- * arbitrary tcp/ip connections, and the authentication agent connection.
- *
- * As far as I am concerned, the code I have written for this software
- * can be used freely for any purpose.  Any derived versions of this
- * software must be clearly marked as such, and if the derived work is
- * incompatible with the protocol description in the RFC file, it must be
- * called by a name other than "ssh" or "Secure Shell".
- *
- *
- * SSH2 support added by Markus Friedl.
- * Copyright (c) 1999,2000 Markus Friedl.  All rights reserved.
- * Copyright (c) 1999 Dug Song.  All rights reserved.
- * Copyright (c) 1999 Theo de Raadt.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "includes.h"
-RCSID("$OpenBSD: channels.c,v 1.119 2001/05/28 23:25:24 markus Exp $");
-
-#include <openssl/rsa.h>
-#include <openssl/dsa.h>
-
-#include "ssh.h"
-#include "ssh1.h"
-#include "ssh2.h"
-#include "packet.h"
-#include "xmalloc.h"
-#include "buffer.h"
-#include "bufaux.h"
-#include "uidswap.h"
-#include "log.h"
-#include "misc.h"
-#include "channels.h"
-#include "nchan.h"
-#include "compat.h"
-#include "canohost.h"
-#include "key.h"
-#include "authfd.h"
-
-/* Maximum number of fake X11 displays to try. */
-#define MAX_DISPLAYS  1000
-
-/* Max len of agent socket */
-#define MAX_SOCKET_NAME 100
-
-/*
- * Pointer to an array containing all allocated channels.  The array is
- * dynamically extended as needed.
- */
-static Channel **channels = NULL;
-
-/*
- * Size of the channel array.  All slots of the array must always be
- * initialized (at least the type field); unused slots set to NULL
- */
-static int channels_alloc = 0;
-
-/*
- * Maximum file descriptor value used in any of the channels.  This is
- * updated in channel_new.
- */
-static int channel_max_fd = 0;
-
-/* Name and directory of socket for authentication agent forwarding. */
-static char *channel_forwarded_auth_socket_name = NULL;
-static char *channel_forwarded_auth_socket_dir = NULL;
-
-/* Saved X11 authentication protocol name. */
-char *x11_saved_proto = NULL;
-
-/* Saved X11 authentication data.  This is the real data. */
-char *x11_saved_data = NULL;
-u_int x11_saved_data_len = 0;
-
-/*
- * Fake X11 authentication data.  This is what the server will be sending us;
- * we should replace any occurrences of this by the real data.
- */
-char *x11_fake_data = NULL;
-u_int x11_fake_data_len;
-
-/*
- * Data structure for storing which hosts are permitted for forward requests.
- * The local sides of any remote forwards are stored in this array to prevent
- * a corrupt remote server from accessing arbitrary TCP/IP ports on our local
- * network (which might be behind a firewall).
- */
-typedef struct {
-	char *host_to_connect;		/* Connect to 'host'. */
-	u_short port_to_connect;	/* Connect to 'port'. */
-	u_short listen_port;		/* Remote side should listen port number. */
-} ForwardPermission;
-
-/* List of all permitted host/port pairs to connect. */
-static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION];
-/* Number of permitted host/port pairs in the array. */
-static int num_permitted_opens = 0;
-/*
- * If this is true, all opens are permitted.  This is the case on the server
- * on which we have to trust the client anyway, and the user could do
- * anything after logging in anyway.
- */
-static int all_opens_permitted = 0;
-
-/* This is set to true if both sides support SSH_PROTOFLAG_HOST_IN_FWD_OPEN. */
-static int have_hostname_in_open = 0;
-
-/* AF_UNSPEC or AF_INET or AF_INET6 */
-extern int IPv4or6;
-
-void	 port_open_helper(Channel *c, char *rtype);
-
-/* Sets specific protocol options. */
-
-void
-channel_set_options(int hostname_in_open)
-{
-	have_hostname_in_open = hostname_in_open;
-}
-
-/* lookup channel by id */
-
-Channel *
-channel_lookup(int id)
-{
-	Channel *c;
-
-	if (id < 0 || id > channels_alloc) {
-		log("channel_lookup: %d: bad id", id);
-		return NULL;
-	}
-	c = channels[id];
-	if (c == NULL) {
-		log("channel_lookup: %d: bad id: channel free", id);
-		return NULL;
-	}
-	return c;
-}
-
-/*
- * Register filedescriptors for a channel, used when allocating a channel or
- * when the channel consumer/producer is ready, e.g. shell exec'd
- */
-
-void
-channel_register_fds(Channel *c, int rfd, int wfd, int efd,
-    int extusage, int nonblock)
-{
-	/* Update the maximum file descriptor value. */
-	channel_max_fd = MAX(channel_max_fd, rfd);
-	channel_max_fd = MAX(channel_max_fd, wfd);
-	channel_max_fd = MAX(channel_max_fd, efd);
-
-	/* XXX set close-on-exec -markus */
-
-	c->rfd = rfd;
-	c->wfd = wfd;
-	c->sock = (rfd == wfd) ? rfd : -1;
-	c->efd = efd;
-	c->extended_usage = extusage;
-
-	/* XXX ugly hack: nonblock is only set by the server */
-	if (nonblock && isatty(c->rfd)) {
-		debug("channel %d: rfd %d isatty", c->self, c->rfd);
-		c->isatty = 1;
-		if (!isatty(c->wfd)) {
-			error("channel %d: wfd %d is not a tty?",
-			    c->self, c->wfd);
-		}
-	} else {
-		c->isatty = 0;
-	}
-
-	/* enable nonblocking mode */
-	if (nonblock) {
-		if (rfd != -1)
-			set_nonblock(rfd);
-		if (wfd != -1)
-			set_nonblock(wfd);
-		if (efd != -1)
-			set_nonblock(efd);
-	}
-}
-
-/*
- * Allocate a new channel object and set its type and socket. This will cause
- * remote_name to be freed.
- */
-
-Channel *
-channel_new(char *ctype, int type, int rfd, int wfd, int efd,
-    int window, int maxpack, int extusage, char *remote_name, int nonblock)
-{
-	int i, found;
-	Channel *c;
-
-	/* Do initial allocation if this is the first call. */
-	if (channels_alloc == 0) {
-		chan_init();
-		channels_alloc = 10;
-		channels = xmalloc(channels_alloc * sizeof(Channel *));
-		for (i = 0; i < channels_alloc; i++)
-			channels[i] = NULL;
-		/*
-		 * Kludge: arrange a call to channel_stop_listening if we
-		 * terminate with fatal().
-		 */
-		fatal_add_cleanup((void (*) (void *)) channel_stop_listening, NULL);
-	}
-	/* Try to find a free slot where to put the new channel. */
-	for (found = -1, i = 0; i < channels_alloc; i++)
-		if (channels[i] == NULL) {
-			/* Found a free slot. */
-			found = i;
-			break;
-		}
-	if (found == -1) {
-		/* There are no free slots.  Take last+1 slot and expand the array.  */
-		found = channels_alloc;
-		channels_alloc += 10;
-		debug2("channel: expanding %d", channels_alloc);
-		channels = xrealloc(channels, channels_alloc * sizeof(Channel *));
-		for (i = found; i < channels_alloc; i++)
-			channels[i] = NULL;
-	}
-	/* Initialize and return new channel. */
-	c = channels[found] = xmalloc(sizeof(Channel));
-	buffer_init(&c->input);
-	buffer_init(&c->output);
-	buffer_init(&c->extended);
-	chan_init_iostates(c);
-	channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
-	c->self = found;
-	c->type = type;
-	c->ctype = ctype;
-	c->local_window = window;
-	c->local_window_max = window;
-	c->local_consumed = 0;
-	c->local_maxpacket = maxpack;
-	c->remote_id = -1;
-	c->remote_name = remote_name;
-	c->remote_window = 0;
-	c->remote_maxpacket = 0;
-	c->cb_fn = NULL;
-	c->cb_arg = NULL;
-	c->cb_event = 0;
-	c->dettach_user = NULL;
-	c->input_filter = NULL;
-	debug("channel %d: new [%s]", found, remote_name);
-	return c;
-}
-
-/* Close all channel fd/socket. */
-
-void
-channel_close_fds(Channel *c)
-{
-	debug3("channel_close_fds: channel %d: r %d w %d e %d",
-	    c->self, c->rfd, c->wfd, c->efd);
-
-	if (c->sock != -1) {
-		close(c->sock);
-		c->sock = -1;
-	}
-	if (c->rfd != -1) {
-		close(c->rfd);
-		c->rfd = -1;
-	}
-	if (c->wfd != -1) {
-		close(c->wfd);
-		c->wfd = -1;
-	}
-	if (c->efd != -1) {
-		close(c->efd);
-		c->efd = -1;
-	}
-}
-
-/* Free the channel and close its fd/socket. */
-
-void
-channel_free(Channel *c)
-{
-	char *s;
-	int i, n;
-
-	for (n = 0, i = 0; i < channels_alloc; i++)
-		if (channels[i])
-			n++;
-	debug("channel_free: channel %d: %s, nchannels %d", c->self,
-	    c->remote_name ? c->remote_name : "???", n);
-
-	s = channel_open_message();
-	debug3("channel_free: status: %s", s);
-	xfree(s);
-
-	if (c->dettach_user != NULL) {
-		debug("channel_free: channel %d: dettaching channel user", c->self);
-		c->dettach_user(c->self, NULL);
-	}
-	if (c->sock != -1)
-		shutdown(c->sock, SHUT_RDWR);
-	channel_close_fds(c);
-	buffer_free(&c->input);
-	buffer_free(&c->output);
-	buffer_free(&c->extended);
-	if (c->remote_name) {
-		xfree(c->remote_name);
-		c->remote_name = NULL;
-	}
-	channels[c->self] = NULL;
-	xfree(c);
-}
-
-/*
- * 'channel_pre*' are called just before select() to add any bits relevant to
- * channels in the select bitmasks.
- */
-/*
- * 'channel_post*': perform any appropriate operations for channels which
- * have events pending.
- */
-typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset);
-chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
-chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
-
-void
-channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset)
-{
-	FD_SET(c->sock, readset);
-}
-
-void
-channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset)
-{
-	debug3("channel %d: waiting for connection", c->self);
-	FD_SET(c->sock, writeset);
-}
-
-void
-channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset)
-{
-	if (buffer_len(&c->input) < packet_get_maxsize())
-		FD_SET(c->sock, readset);
-	if (buffer_len(&c->output) > 0)
-		FD_SET(c->sock, writeset);
-}
-
-void
-channel_pre_open_15(Channel *c, fd_set * readset, fd_set * writeset)
-{
-	/* test whether sockets are 'alive' for read/write */
-	if (c->istate == CHAN_INPUT_OPEN)
-		if (buffer_len(&c->input) < packet_get_maxsize())
-			FD_SET(c->sock, readset);
-	if (c->ostate == CHAN_OUTPUT_OPEN ||
-	    c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
-		if (buffer_len(&c->output) > 0) {
-			FD_SET(c->sock, writeset);
-		} else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
-			chan_obuf_empty(c);
-		}
-	}
-}
-
-void
-channel_pre_open_20(Channel *c, fd_set * readset, fd_set * writeset)
-{
-	if (c->istate == CHAN_INPUT_OPEN &&
-	    c->remote_window > 0 &&
-	    buffer_len(&c->input) < c->remote_window)
-		FD_SET(c->rfd, readset);
-	if (c->ostate == CHAN_OUTPUT_OPEN ||
-	    c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
-		if (buffer_len(&c->output) > 0) {
-			FD_SET(c->wfd, writeset);
-		} else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
-			chan_obuf_empty(c);
-		}
-	}
-	/** XXX check close conditions, too */
-	if (c->efd != -1) {
-		if (c->extended_usage == CHAN_EXTENDED_WRITE &&
-		    buffer_len(&c->extended) > 0)
-			FD_SET(c->efd, writeset);
-		else if (c->extended_usage == CHAN_EXTENDED_READ &&
-		    buffer_len(&c->extended) < c->remote_window)
-			FD_SET(c->efd, readset);
-	}
-}
-
-void
-channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset)
-{
-	if (buffer_len(&c->input) == 0) {
-		packet_start(SSH_MSG_CHANNEL_CLOSE);
-		packet_put_int(c->remote_id);
-		packet_send();
-		c->type = SSH_CHANNEL_CLOSED;
-		debug("channel %d: closing after input drain.", c->self);
-	}
-}
-
-void
-channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset)
-{
-	if (buffer_len(&c->output) == 0)
-		chan_mark_dead(c);
-	else
-		FD_SET(c->sock, writeset);
-}
-
-/*
- * This is a special state for X11 authentication spoofing.  An opened X11
- * connection (when authentication spoofing is being done) remains in this
- * state until the first packet has been completely read.  The authentication
- * data in that packet is then substituted by the real data if it matches the
- * fake data, and the channel is put into normal mode.
- * XXX All this happens at the client side.
- */
-int
-x11_open_helper(Channel *c)
-{
-	u_char *ucp;
-	u_int proto_len, data_len;
-
-	/* Check if the fixed size part of the packet is in buffer. */
-	if (buffer_len(&c->output) < 12)
-		return 0;
-
-	/* Parse the lengths of variable-length fields. */
-	ucp = (u_char *) buffer_ptr(&c->output);
-	if (ucp[0] == 0x42) {	/* Byte order MSB first. */
-		proto_len = 256 * ucp[6] + ucp[7];
-		data_len = 256 * ucp[8] + ucp[9];
-	} else if (ucp[0] == 0x6c) {	/* Byte order LSB first. */
-		proto_len = ucp[6] + 256 * ucp[7];
-		data_len = ucp[8] + 256 * ucp[9];
-	} else {
-		debug("Initial X11 packet contains bad byte order byte: 0x%x",
-		      ucp[0]);
-		return -1;
-	}
-
-	/* Check if the whole packet is in buffer. */
-	if (buffer_len(&c->output) <
-	    12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
-		return 0;
-
-	/* Check if authentication protocol matches. */
-	if (proto_len != strlen(x11_saved_proto) ||
-	    memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
-		debug("X11 connection uses different authentication protocol.");
-		return -1;
-	}
-	/* Check if authentication data matches our fake data. */
-	if (data_len != x11_fake_data_len ||
-	    memcmp(ucp + 12 + ((proto_len + 3) & ~3),
-		x11_fake_data, x11_fake_data_len) != 0) {
-		debug("X11 auth data does not match fake data.");
-		return -1;
-	}
-	/* Check fake data length */
-	if (x11_fake_data_len != x11_saved_data_len) {
-		error("X11 fake_data_len %d != saved_data_len %d",
-		    x11_fake_data_len, x11_saved_data_len);
-		return -1;
-	}
-	/*
-	 * Received authentication protocol and data match
-	 * our fake data. Substitute the fake data with real
-	 * data.
-	 */
-	memcpy(ucp + 12 + ((proto_len + 3) & ~3),
-	    x11_saved_data, x11_saved_data_len);
-	return 1;
-}
-
-void
-channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset)
-{
-	int ret = x11_open_helper(c);
-	if (ret == 1) {
-		/* Start normal processing for the channel. */
-		c->type = SSH_CHANNEL_OPEN;
-		channel_pre_open_13(c, readset, writeset);
-	} else if (ret == -1) {
-		/*
-		 * We have received an X11 connection that has bad
-		 * authentication information.
-		 */
-		log("X11 connection rejected because of wrong authentication.");
-		buffer_clear(&c->input);
-		buffer_clear(&c->output);
-		close(c->sock);
-		c->sock = -1;
-		c->type = SSH_CHANNEL_CLOSED;
-		packet_start(SSH_MSG_CHANNEL_CLOSE);
-		packet_put_int(c->remote_id);
-		packet_send();
-	}
-}
-
-void
-channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset)
-{
-	int ret = x11_open_helper(c);
-	if (ret == 1) {
-		c->type = SSH_CHANNEL_OPEN;
-		if (compat20)
-			channel_pre_open_20(c, readset, writeset);
-		else
-			channel_pre_open_15(c, readset, writeset);
-	} else if (ret == -1) {
-		debug("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
-		chan_read_failed(c);	/** force close? */
-		chan_write_failed(c);
-		debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
-	}
-}
-
-/* try to decode a socks4 header */
-int
-channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset)
-{
-	u_char *p, *host;
-	int len, have, i, found;
-	char username[256];	
-	struct {
-		u_int8_t version;
-		u_int8_t command;
-		u_int16_t dest_port;
-		struct in_addr dest_addr;
-	} s4_req, s4_rsp;
-
-	debug2("channel %d: decode socks4", c->self);
-
-	have = buffer_len(&c->input);
-	len = sizeof(s4_req);
-	if (have < len)
-		return 0;
-	p = buffer_ptr(&c->input);
-	for (found = 0, i = len; i < have; i++) {
-		if (p[i] == '\0') {
-			found = 1;
-			break;
-		}
-		if (i > 1024) {
-			/* the peer is probably sending garbage */
-			debug("channel %d: decode socks4: too long",
-			    c->self);
-			return -1;
-		}
-	}
-	if (!found)
-		return 0;
-	buffer_get(&c->input, (char *)&s4_req.version, 1);
-	buffer_get(&c->input, (char *)&s4_req.command, 1);
-	buffer_get(&c->input, (char *)&s4_req.dest_port, 2);
-	buffer_get(&c->input, (char *)&s4_req.dest_addr, 4);
-	have = buffer_len(&c->input);
-	p = buffer_ptr(&c->input);
-	len = strlen(p);
-	debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
-	if (len > have)
-		fatal("channel %d: decode socks4: len %d > have %d",
-		    c->self, len, have);
-	strlcpy(username, p, sizeof(username));
-	buffer_consume(&c->input, len);
-	buffer_consume(&c->input, 1);		/* trailing '\0' */
-
-	host = inet_ntoa(s4_req.dest_addr);
-	strlcpy(c->path, host, sizeof(c->path));
-	c->host_port = ntohs(s4_req.dest_port);
-	
-	debug("channel %d: dynamic request: socks4 host %s port %u command %u",
-	    c->self, host, c->host_port, s4_req.command);
-
-	if (s4_req.command != 1) {
-		debug("channel %d: cannot handle: socks4 cn %d",
-		    c->self, s4_req.command);
-		return -1;
-	}
-	s4_rsp.version = 0;			/* vn: 0 for reply */
-	s4_rsp.command = 90;			/* cd: req granted */
-	s4_rsp.dest_port = 0;			/* ignored */
-	s4_rsp.dest_addr.s_addr = INADDR_ANY;	/* ignored */
-	buffer_append(&c->output, (char *)&s4_rsp, sizeof(s4_rsp));
-	return 1;
-}
-
-/* dynamic port forwarding */
-void
-channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset)
-{
-	u_char *p;
-	int have, ret;
-
-	have = buffer_len(&c->input);
-
-	debug2("channel %d: pre_dynamic: have %d", c->self, have);
-	/* buffer_dump(&c->input); */
-	/* check if the fixed size part of the packet is in buffer. */
-	if (have < 4) {
-		/* need more */
-		FD_SET(c->sock, readset);
-		return;
-	}
-	/* try to guess the protocol */
-	p = buffer_ptr(&c->input);
-	switch (p[0]) {
-	case 0x04:
-		ret = channel_decode_socks4(c, readset, writeset);
-		break;
-	default:
-		ret = -1;
-		break;
-	}
-	if (ret < 0) {
-		chan_mark_dead(c);
-	} else if (ret == 0) {
-		debug2("channel %d: pre_dynamic: need more", c->self);
-		/* need more */
-		FD_SET(c->sock, readset);
-	} else {
-		/* switch to the next state */
-		c->type = SSH_CHANNEL_OPENING;
-		port_open_helper(c, "direct-tcpip");
-	}
-}
-
-/* This is our fake X11 server socket. */
-void
-channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset)
-{
-	Channel *nc;
-	struct sockaddr addr;
-	int newsock;
-	socklen_t addrlen;
-	char buf[16384], *remote_ipaddr;
-	int remote_port;
-
-	if (FD_ISSET(c->sock, readset)) {
-		debug("X11 connection requested.");
-		addrlen = sizeof(addr);
-		newsock = accept(c->sock, &addr, &addrlen);
-		if (newsock < 0) {
-			error("accept: %.100s", strerror(errno));
-			return;
-		}
-		remote_ipaddr = get_peer_ipaddr(newsock);
-		remote_port = get_peer_port(newsock);
-		snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
-		    remote_ipaddr, remote_port);
-
-		nc = channel_new("accepted x11 socket",
-		    SSH_CHANNEL_OPENING, newsock, newsock, -1,
-		    c->local_window_max, c->local_maxpacket,
-		    0, xstrdup(buf), 1);
-		if (nc == NULL) {
-			close(newsock);
-			xfree(remote_ipaddr);
-			return;
-		}
-		if (compat20) {
-			packet_start(SSH2_MSG_CHANNEL_OPEN);
-			packet_put_cstring("x11");
-			packet_put_int(nc->self);
-			packet_put_int(c->local_window_max);
-			packet_put_int(c->local_maxpacket);
-			/* originator ipaddr and port */
-			packet_put_cstring(remote_ipaddr);
-			if (datafellows & SSH_BUG_X11FWD) {
-				debug("ssh2 x11 bug compat mode");
-			} else {
-				packet_put_int(remote_port);
-			}
-			packet_send();
-		} else {
-			packet_start(SSH_SMSG_X11_OPEN);
-			packet_put_int(nc->self);
-			if (have_hostname_in_open)
-				packet_put_string(buf, strlen(buf));
-			packet_send();
-		}
-		xfree(remote_ipaddr);
-	}
-}
-
-void
-port_open_helper(Channel *c, char *rtype)
-{
-	int direct;
-	char buf[1024];
-	char *remote_ipaddr = get_peer_ipaddr(c->sock);
-	u_short remote_port = get_peer_port(c->sock);
-
-	direct = (strcmp(rtype, "direct-tcpip") == 0);
-
-	snprintf(buf, sizeof buf,
-	    "%s: listening port %d for %.100s port %d, "
-	    "connect from %.200s port %d",
-	    rtype, c->listening_port, c->path, c->host_port,
-	    remote_ipaddr, remote_port);
-
-	xfree(c->remote_name);
-	c->remote_name = xstrdup(buf);
-
-	if (compat20) {
-		packet_start(SSH2_MSG_CHANNEL_OPEN);
-		packet_put_cstring(rtype);
-		packet_put_int(c->self);
-		packet_put_int(c->local_window_max);
-		packet_put_int(c->local_maxpacket);
-		if (direct) {
-			/* target host, port */
-			packet_put_cstring(c->path);
-			packet_put_int(c->host_port);
-		} else {
-			/* listen address, port */
-			packet_put_cstring(c->path);
-			packet_put_int(c->listening_port);
-		}
-		/* originator host and port */
-		packet_put_cstring(remote_ipaddr);
-		packet_put_int(remote_port);
-		packet_send();
-	} else {
-		packet_start(SSH_MSG_PORT_OPEN);
-		packet_put_int(c->self);
-		packet_put_cstring(c->path);
-		packet_put_int(c->host_port);
-		if (have_hostname_in_open)
-			packet_put_cstring(c->remote_name);
-		packet_send();
-	}
-	xfree(remote_ipaddr);
-}
-
-/*
- * This socket is listening for connections to a forwarded TCP/IP port.
- */
-void
-channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset)
-{
-	Channel *nc;
-	struct sockaddr addr;
-	int newsock, nextstate;
-	socklen_t addrlen;
-	char *rtype;
-
-	if (FD_ISSET(c->sock, readset)) {
-		debug("Connection to port %d forwarding "
-		    "to %.100s port %d requested.",
-		    c->listening_port, c->path, c->host_port);
-
-		rtype = (c->type == SSH_CHANNEL_RPORT_LISTENER) ?
-		    "forwarded-tcpip" : "direct-tcpip";
-		nextstate = (c->host_port == 0 &&
-		    c->type != SSH_CHANNEL_RPORT_LISTENER) ?
-		    SSH_CHANNEL_DYNAMIC : SSH_CHANNEL_OPENING;
-
-		addrlen = sizeof(addr);
-		newsock = accept(c->sock, &addr, &addrlen);
-		if (newsock < 0) {
-			error("accept: %.100s", strerror(errno));
-			return;
-		}
-		nc = channel_new(rtype,
-		    nextstate, newsock, newsock, -1,
-		    c->local_window_max, c->local_maxpacket,
-		    0, xstrdup(rtype), 1);
-		if (nc == NULL) {
-			error("channel_post_port_listener: no new channel:");
-			close(newsock);
-			return;
-		}
-		nc->listening_port = c->listening_port;
-		nc->host_port = c->host_port;
-		strlcpy(nc->path, c->path, sizeof(nc->path));
-
-		if (nextstate != SSH_CHANNEL_DYNAMIC)
-			port_open_helper(nc, rtype);
-	}
-}
-
-/*
- * This is the authentication agent socket listening for connections from
- * clients.
- */
-void
-channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset)
-{
-	Channel *nc;
-	int newsock;
-	struct sockaddr addr;
-	socklen_t addrlen;
-
-	if (FD_ISSET(c->sock, readset)) {
-		addrlen = sizeof(addr);
-		newsock = accept(c->sock, &addr, &addrlen);
-		if (newsock < 0) {
-			error("accept from auth socket: %.100s", strerror(errno));
-			return;
-		}
-		nc = channel_new("accepted auth socket",
-		    SSH_CHANNEL_OPENING, newsock, newsock, -1,
-		    c->local_window_max, c->local_maxpacket,
-		    0, xstrdup("accepted auth socket"), 1);
-		if (nc == NULL) {
-			error("channel_post_auth_listener: channel_new failed");
-			close(newsock);
-		}
-		if (compat20) {
-			packet_start(SSH2_MSG_CHANNEL_OPEN);
-			packet_put_cstring("auth-agent@openssh.com");
-			packet_put_int(nc->self);
-			packet_put_int(c->local_window_max);
-			packet_put_int(c->local_maxpacket);
-		} else {
-			packet_start(SSH_SMSG_AGENT_OPEN);
-			packet_put_int(nc->self);
-		}
-		packet_send();
-	}
-}
-
-void
-channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset)
-{
-	int err = 0;
-	int sz = sizeof(err);
-
-	if (FD_ISSET(c->sock, writeset)) {
-		if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, (char *)&err,
-		    &sz) < 0) {
-			err = errno;
-			error("getsockopt SO_ERROR failed");
-		}
-		if (err == 0) {
-			debug("channel %d: connected", c->self);
-			c->type = SSH_CHANNEL_OPEN;
-			if (compat20) {
-				packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
-				packet_put_int(c->remote_id);
-				packet_put_int(c->self);
-				packet_put_int(c->local_window);
-				packet_put_int(c->local_maxpacket);
-			} else {
-				packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
-				packet_put_int(c->remote_id);
-				packet_put_int(c->self);
-			}
-		} else {
-			debug("channel %d: not connected: %s",
-			    c->self, strerror(err));
-			if (compat20) {
-				packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
-				packet_put_int(c->remote_id);
-				packet_put_int(SSH2_OPEN_CONNECT_FAILED);
-				if (!(datafellows & SSH_BUG_OPENFAILURE)) {
-					packet_put_cstring(strerror(err));
-					packet_put_cstring("");
-				}
-			} else {
-				packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
-				packet_put_int(c->remote_id);
-			}
-			chan_mark_dead(c);
-		}
-		packet_send();
-	}
-}
-
-int
-channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset)
-{
-	char buf[16*1024];
-	int len;
-
-	if (c->rfd != -1 &&
-	    FD_ISSET(c->rfd, readset)) {
-		len = read(c->rfd, buf, sizeof(buf));
-		if (len < 0 && (errno == EINTR || errno == EAGAIN))
-			return 1;
-		if (len <= 0) {
-			debug("channel %d: read<=0 rfd %d len %d",
-			    c->self, c->rfd, len);
-			if (c->type != SSH_CHANNEL_OPEN) {
-				debug("channel %d: not open", c->self);
-				chan_mark_dead(c);
-				return -1;
-			} else if (compat13) {
-				buffer_consume(&c->output, buffer_len(&c->output));
-				c->type = SSH_CHANNEL_INPUT_DRAINING;
-				debug("channel %d: status set to input draining.", c->self);
-			} else {
-				chan_read_failed(c);
-			}
-			return -1;
-		}
-		if(c->input_filter != NULL) {
-			if (c->input_filter(c, buf, len) == -1) {
-				debug("channel %d: filter stops", c->self);
-				chan_read_failed(c);
-			}
-		} else {
-			buffer_append(&c->input, buf, len);
-		}
-	}
-	return 1;
-}
-int
-channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset)
-{
-	struct termios tio;
-	int len;
-
-	/* Send buffered output data to the socket. */
-	if (c->wfd != -1 &&
-	    FD_ISSET(c->wfd, writeset) &&
-	    buffer_len(&c->output) > 0) {
-		len = write(c->wfd, buffer_ptr(&c->output),
-		    buffer_len(&c->output));
-		if (len < 0 && (errno == EINTR || errno == EAGAIN))
-			return 1;
-		if (len <= 0) {
-			if (c->type != SSH_CHANNEL_OPEN) {
-				debug("channel %d: not open", c->self);
-				chan_mark_dead(c);
-				return -1;
-			} else if (compat13) {
-				buffer_consume(&c->output, buffer_len(&c->output));
-				debug("channel %d: status set to input draining.", c->self);
-				c->type = SSH_CHANNEL_INPUT_DRAINING;
-			} else {
-				chan_write_failed(c);
-			}
-			return -1;
-		}
-		if (compat20 && c->isatty) {
-			if (tcgetattr(c->wfd, &tio) == 0 &&
-			    !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
-				/*
-				 * Simulate echo to reduce the impact of
-				 * traffic analysis. We need to match the
-				 * size of a SSH2_MSG_CHANNEL_DATA message
-				 * (4 byte channel id + data)
-				 */
-				packet_send_ignore(4 + len);
-				packet_send();
-			}
-		}
-		buffer_consume(&c->output, len);
-		if (compat20 && len > 0) {
-			c->local_consumed += len;
-		}
-	}
-	return 1;
-}
-int
-channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset)
-{
-	char buf[16*1024];
-	int len;
-
-/** XXX handle drain efd, too */
-	if (c->efd != -1) {
-		if (c->extended_usage == CHAN_EXTENDED_WRITE &&
-		    FD_ISSET(c->efd, writeset) &&
-		    buffer_len(&c->extended) > 0) {
-			len = write(c->efd, buffer_ptr(&c->extended),
-			    buffer_len(&c->extended));
-			debug2("channel %d: written %d to efd %d",
-			    c->self, len, c->efd);
-			if (len < 0 && (errno == EINTR || errno == EAGAIN))
-				return 1;
-			if (len <= 0) {
-				debug2("channel %d: closing write-efd %d",
-				    c->self, c->efd);
-				close(c->efd);
-				c->efd = -1;
-			} else {
-				buffer_consume(&c->extended, len);
-				c->local_consumed += len;
-			}
-		} else if (c->extended_usage == CHAN_EXTENDED_READ &&
-		    FD_ISSET(c->efd, readset)) {
-			len = read(c->efd, buf, sizeof(buf));
-			debug2("channel %d: read %d from efd %d",
-			     c->self, len, c->efd);
-			if (len < 0 && (errno == EINTR || errno == EAGAIN))
-				return 1;
-			if (len <= 0) {
-				debug2("channel %d: closing read-efd %d",
-				    c->self, c->efd);
-				close(c->efd);
-				c->efd = -1;
-			} else {
-				buffer_append(&c->extended, buf, len);
-			}
-		}
-	}
-	return 1;
-}
-int
-channel_check_window(Channel *c)
-{
-	if (c->type == SSH_CHANNEL_OPEN &&
-	    !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
-	    c->local_window < c->local_window_max/2 &&
-	    c->local_consumed > 0) {
-		packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
-		packet_put_int(c->remote_id);
-		packet_put_int(c->local_consumed);
-		packet_send();
-		debug2("channel %d: window %d sent adjust %d",
-		    c->self, c->local_window,
-		    c->local_consumed);
-		c->local_window += c->local_consumed;
-		c->local_consumed = 0;
-	}
-	return 1;
-}
-
-void
-channel_post_open_1(Channel *c, fd_set * readset, fd_set * writeset)
-{
-	channel_handle_rfd(c, readset, writeset);
-	channel_handle_wfd(c, readset, writeset);
-}
-
-void
-channel_post_open_2(Channel *c, fd_set * readset, fd_set * writeset)
-{
-	channel_handle_rfd(c, readset, writeset);
-	channel_handle_wfd(c, readset, writeset);
-	channel_handle_efd(c, readset, writeset);
-
-	channel_check_window(c);
-}
-
-void
-channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset)
-{
-	int len;
-	/* Send buffered output data to the socket. */
-	if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
-		len = write(c->sock, buffer_ptr(&c->output),
-			    buffer_len(&c->output));
-		if (len <= 0)
-			buffer_consume(&c->output, buffer_len(&c->output));
-		else
-			buffer_consume(&c->output, len);
-	}
-}
-
-void
-channel_handler_init_20(void)
-{
-	channel_pre[SSH_CHANNEL_OPEN] =			&channel_pre_open_20;
-	channel_pre[SSH_CHANNEL_X11_OPEN] =		&channel_pre_x11_open;
-	channel_pre[SSH_CHANNEL_PORT_LISTENER] =	&channel_pre_listener;
-	channel_pre[SSH_CHANNEL_RPORT_LISTENER] =	&channel_pre_listener;
-	channel_pre[SSH_CHANNEL_X11_LISTENER] =		&channel_pre_listener;
-	channel_pre[SSH_CHANNEL_AUTH_SOCKET] =		&channel_pre_listener;
-	channel_pre[SSH_CHANNEL_CONNECTING] =		&channel_pre_connecting;
-	channel_pre[SSH_CHANNEL_DYNAMIC] =		&channel_pre_dynamic;
-
-	channel_post[SSH_CHANNEL_OPEN] =		&channel_post_open_2;
-	channel_post[SSH_CHANNEL_PORT_LISTENER] =	&channel_post_port_listener;
-	channel_post[SSH_CHANNEL_RPORT_LISTENER] =	&channel_post_port_listener;
-	channel_post[SSH_CHANNEL_X11_LISTENER] =	&channel_post_x11_listener;
-	channel_post[SSH_CHANNEL_AUTH_SOCKET] =		&channel_post_auth_listener;
-	channel_post[SSH_CHANNEL_CONNECTING] =		&channel_post_connecting;
-	channel_post[SSH_CHANNEL_DYNAMIC] =		&channel_post_open_2;
-}
-
-void
-channel_handler_init_13(void)
-{
-	channel_pre[SSH_CHANNEL_OPEN] =			&channel_pre_open_13;
-	channel_pre[SSH_CHANNEL_X11_OPEN] =		&channel_pre_x11_open_13;
-	channel_pre[SSH_CHANNEL_X11_LISTENER] =		&channel_pre_listener;
-	channel_pre[SSH_CHANNEL_PORT_LISTENER] =	&channel_pre_listener;
-	channel_pre[SSH_CHANNEL_AUTH_SOCKET] =		&channel_pre_listener;
-	channel_pre[SSH_CHANNEL_INPUT_DRAINING] =	&channel_pre_input_draining;
-	channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] =	&channel_pre_output_draining;
-	channel_pre[SSH_CHANNEL_CONNECTING] =		&channel_pre_connecting;
-	channel_pre[SSH_CHANNEL_DYNAMIC] =		&channel_pre_dynamic;
-
-	channel_post[SSH_CHANNEL_OPEN] =		&channel_post_open_1;
-	channel_post[SSH_CHANNEL_X11_LISTENER] =	&channel_post_x11_listener;
-	channel_post[SSH_CHANNEL_PORT_LISTENER] =	&channel_post_port_listener;
-	channel_post[SSH_CHANNEL_AUTH_SOCKET] =		&channel_post_auth_listener;
-	channel_post[SSH_CHANNEL_OUTPUT_DRAINING] =	&channel_post_output_drain_13;
-	channel_post[SSH_CHANNEL_CONNECTING] =		&channel_post_connecting;
-	channel_post[SSH_CHANNEL_DYNAMIC] =		&channel_post_open_1;
-}
-
-void
-channel_handler_init_15(void)
-{
-	channel_pre[SSH_CHANNEL_OPEN] =			&channel_pre_open_15;
-	channel_pre[SSH_CHANNEL_X11_OPEN] =		&channel_pre_x11_open;
-	channel_pre[SSH_CHANNEL_X11_LISTENER] =		&channel_pre_listener;
-	channel_pre[SSH_CHANNEL_PORT_LISTENER] =	&channel_pre_listener;
-	channel_pre[SSH_CHANNEL_AUTH_SOCKET] =		&channel_pre_listener;
-	channel_pre[SSH_CHANNEL_CONNECTING] =		&channel_pre_connecting;
-	channel_pre[SSH_CHANNEL_DYNAMIC] =		&channel_pre_dynamic;
-
-	channel_post[SSH_CHANNEL_X11_LISTENER] =	&channel_post_x11_listener;
-	channel_post[SSH_CHANNEL_PORT_LISTENER] =	&channel_post_port_listener;
-	channel_post[SSH_CHANNEL_AUTH_SOCKET] =		&channel_post_auth_listener;
-	channel_post[SSH_CHANNEL_OPEN] =		&channel_post_open_1;
-	channel_post[SSH_CHANNEL_CONNECTING] =		&channel_post_connecting;
-	channel_post[SSH_CHANNEL_DYNAMIC] =		&channel_post_open_1;
-}
-
-void
-channel_handler_init(void)
-{
-	int i;
-	for(i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
-		channel_pre[i] = NULL;
-		channel_post[i] = NULL;
-	}
-	if (compat20)
-		channel_handler_init_20();
-	else if (compat13)
-		channel_handler_init_13();
-	else
-		channel_handler_init_15();
-}
-
-void
-channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset)
-{
-	static int did_init = 0;
-	int i;
-	Channel *c;
-
-	if (!did_init) {
-		channel_handler_init();
-		did_init = 1;
-	}
-	for (i = 0; i < channels_alloc; i++) {
-		c = channels[i];
-		if (c == NULL)
-			continue;
-		if (ftab[c->type] != NULL)
-			(*ftab[c->type])(c, readset, writeset);
-		if (chan_is_dead(c)) {
-			/*
-			 * we have to remove the fd's from the select mask
-			 * before the channels are free'd and the fd's are
-			 * closed
-			 */
-			if (c->wfd != -1)
-				FD_CLR(c->wfd, writeset);
-			if (c->rfd != -1)
-				FD_CLR(c->rfd, readset);
-			if (c->efd != -1) {
-				if (c->extended_usage == CHAN_EXTENDED_READ)
-					FD_CLR(c->efd, readset);
-				if (c->extended_usage == CHAN_EXTENDED_WRITE)
-					FD_CLR(c->efd, writeset);
-			}
-			channel_free(c);
-		}
-	}
-}
-
-void
-channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
-    int rekeying)
-{
-	int n;
-	u_int sz;
-
-	n = MAX(*maxfdp, channel_max_fd);
-
-	sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
-	if (*readsetp == NULL || n > *maxfdp) {
-		if (*readsetp)
-			xfree(*readsetp);
-		if (*writesetp)
-			xfree(*writesetp);
-		*readsetp = xmalloc(sz);
-		*writesetp = xmalloc(sz);
-		*maxfdp = n;
-	}
-	memset(*readsetp, 0, sz);
-	memset(*writesetp, 0, sz);
-
-	if (!rekeying)
-		channel_handler(channel_pre, *readsetp, *writesetp);
-}
-
-void
-channel_after_select(fd_set * readset, fd_set * writeset)
-{
-	channel_handler(channel_post, readset, writeset);
-}
-
-/* If there is data to send to the connection, enqueue some of it now. */
-
-void
-channel_output_poll()
-{
-	int len, i;
-	Channel *c;
-
-	for (i = 0; i < channels_alloc; i++) {
-
-		c = channels[i];
-		if (c == NULL)
-			continue;
-
-		/* We are only interested in channels that can have buffered incoming data. */
-		if (compat13) {
-			if (c->type != SSH_CHANNEL_OPEN &&
-			    c->type != SSH_CHANNEL_INPUT_DRAINING)
-				continue;
-		} else {
-			if (c->type != SSH_CHANNEL_OPEN)
-				continue;
-		}
-		if (compat20 &&
-		    (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
-			/* XXX is this true? */
-			debug2("channel %d: no data after CLOSE", c->self);
-			continue;
-		}
-
-		/* Get the amount of buffered data for this channel. */
-		if ((c->istate == CHAN_INPUT_OPEN ||
-		    c->istate == CHAN_INPUT_WAIT_DRAIN) &&
-		    (len = buffer_len(&c->input)) > 0) {
-			/* Send some data for the other side over the secure connection. */
-			if (compat20) {
-				if (len > c->remote_window)
-					len = c->remote_window;
-				if (len > c->remote_maxpacket)
-					len = c->remote_maxpacket;
-			} else {
-				if (packet_is_interactive()) {
-					if (len > 1024)
-						len = 512;
-				} else {
-					/* Keep the packets at reasonable size. */
-					if (len > packet_get_maxsize()/2)
-						len = packet_get_maxsize()/2;
-				}
-			}
-			if (len > 0) {
-				packet_start(compat20 ?
-				    SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
-				packet_put_int(c->remote_id);
-				packet_put_string(buffer_ptr(&c->input), len);
-				packet_send();
-				buffer_consume(&c->input, len);
-				c->remote_window -= len;
-			}
-		} else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
-			if (compat13)
-				fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
-			/*
-			 * input-buffer is empty and read-socket shutdown:
-			 * tell peer, that we will not send more data: send IEOF
-			 */
-			chan_ibuf_empty(c);
-		}
-		/* Send extended data, i.e. stderr */
-		if (compat20 &&
-		    c->remote_window > 0 &&
-		    (len = buffer_len(&c->extended)) > 0 &&
-		    c->extended_usage == CHAN_EXTENDED_READ) {
-			debug2("channel %d: rwin %d elen %d euse %d",
-			    c->self, c->remote_window, buffer_len(&c->extended),
-			    c->extended_usage);
-			if (len > c->remote_window)
-				len = c->remote_window;
-			if (len > c->remote_maxpacket)
-				len = c->remote_maxpacket;
-			packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
-			packet_put_int(c->remote_id);
-			packet_put_int(SSH2_EXTENDED_DATA_STDERR);
-			packet_put_string(buffer_ptr(&c->extended), len);
-			packet_send();
-			buffer_consume(&c->extended, len);
-			c->remote_window -= len;
-			debug2("channel %d: sent ext data %d", c->self, len);
-		}
-	}
-}
-
-/*
- * This is called when a packet of type CHANNEL_DATA has just been received.
- * The message type has already been consumed, but channel number and data is
- * still there.
- */
-
-void
-channel_input_data(int type, int plen, void *ctxt)
-{
-	int id;
-	char *data;
-	u_int data_len;
-	Channel *c;
-
-	/* Get the channel number and verify it. */
-	id = packet_get_int();
-	c = channel_lookup(id);
-	if (c == NULL)
-		packet_disconnect("Received data for nonexistent channel %d.", id);
-
-	/* Ignore any data for non-open channels (might happen on close) */
-	if (c->type != SSH_CHANNEL_OPEN &&
-	    c->type != SSH_CHANNEL_X11_OPEN)
-		return;
-
-	/* same for protocol 1.5 if output end is no longer open */
-	if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN)
-		return;
-
-	/* Get the data. */
-	data = packet_get_string(&data_len);
-	packet_done();
-
-	if (compat20){
-		if (data_len > c->local_maxpacket) {
-			log("channel %d: rcvd big packet %d, maxpack %d",
-			    c->self, data_len, c->local_maxpacket);
-		}
-		if (data_len > c->local_window) {
-			log("channel %d: rcvd too much data %d, win %d",
-			    c->self, data_len, c->local_window);
-			xfree(data);
-			return;
-		}
-		c->local_window -= data_len;
-	}else{
-		packet_integrity_check(plen, 4 + 4 + data_len, type);
-	}
-	buffer_append(&c->output, data, data_len);
-	xfree(data);
-}
-void
-channel_input_extended_data(int type, int plen, void *ctxt)
-{
-	int id;
-	int tcode;
-	char *data;
-	u_int data_len;
-	Channel *c;
-
-	/* Get the channel number and verify it. */
-	id = packet_get_int();
-	c = channel_lookup(id);
-
-	if (c == NULL)
-		packet_disconnect("Received extended_data for bad channel %d.", id);
-	if (c->type != SSH_CHANNEL_OPEN) {
-		log("channel %d: ext data for non open", id);
-		return;
-	}
-	tcode = packet_get_int();
-	if (c->efd == -1 ||
-	    c->extended_usage != CHAN_EXTENDED_WRITE ||
-	    tcode != SSH2_EXTENDED_DATA_STDERR) {
-		log("channel %d: bad ext data", c->self);
-		return;
-	}
-	data = packet_get_string(&data_len);
-	packet_done();
-	if (data_len > c->local_window) {
-		log("channel %d: rcvd too much extended_data %d, win %d",
-		    c->self, data_len, c->local_window);
-		xfree(data);
-		return;
-	}
-	debug2("channel %d: rcvd ext data %d", c->self, data_len);
-	c->local_window -= data_len;
-	buffer_append(&c->extended, data, data_len);
-	xfree(data);
-}
-
-
-/*
- * Returns true if no channel has too much buffered data, and false if one or
- * more channel is overfull.
- */
-
-int
-channel_not_very_much_buffered_data()
-{
-	u_int i;
-	Channel *c;
-
-	for (i = 0; i < channels_alloc; i++) {
-		c = channels[i];
-		if (c != NULL && c->type == SSH_CHANNEL_OPEN) {
-			if (!compat20 && buffer_len(&c->input) > packet_get_maxsize()) {
-				debug("channel %d: big input buffer %d",
-				    c->self, buffer_len(&c->input));
-				return 0;
-			}
-			if (buffer_len(&c->output) > packet_get_maxsize()) {
-				debug("channel %d: big output buffer %d",
-				    c->self, buffer_len(&c->output));
-				return 0;
-			}
-		}
-	}
-	return 1;
-}
-
-void
-channel_input_ieof(int type, int plen, void *ctxt)
-{
-	int id;
-	Channel *c;
-
-	packet_integrity_check(plen, 4, type);
-
-	id = packet_get_int();
-	c = channel_lookup(id);
-	if (c == NULL)
-		packet_disconnect("Received ieof for nonexistent channel %d.", id);
-	chan_rcvd_ieof(c);
-}
-
-void
-channel_input_close(int type, int plen, void *ctxt)
-{
-	int id;
-	Channel *c;
-
-	packet_integrity_check(plen, 4, type);
-
-	id = packet_get_int();
-	c = channel_lookup(id);
-	if (c == NULL)
-		packet_disconnect("Received close for nonexistent channel %d.", id);
-
-	/*
-	 * Send a confirmation that we have closed the channel and no more
-	 * data is coming for it.
-	 */
-	packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
-	packet_put_int(c->remote_id);
-	packet_send();
-
-	/*
-	 * If the channel is in closed state, we have sent a close request,
-	 * and the other side will eventually respond with a confirmation.
-	 * Thus, we cannot free the channel here, because then there would be
-	 * no-one to receive the confirmation.  The channel gets freed when
-	 * the confirmation arrives.
-	 */
-	if (c->type != SSH_CHANNEL_CLOSED) {
-		/*
-		 * Not a closed channel - mark it as draining, which will
-		 * cause it to be freed later.
-		 */
-		buffer_consume(&c->input, buffer_len(&c->input));
-		c->type = SSH_CHANNEL_OUTPUT_DRAINING;
-	}
-}
-
-/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
-void
-channel_input_oclose(int type, int plen, void *ctxt)
-{
-	int id = packet_get_int();
-	Channel *c = channel_lookup(id);
-	packet_integrity_check(plen, 4, type);
-	if (c == NULL)
-		packet_disconnect("Received oclose for nonexistent channel %d.", id);
-	chan_rcvd_oclose(c);
-}
-
-void
-channel_input_close_confirmation(int type, int plen, void *ctxt)
-{
-	int id = packet_get_int();
-	Channel *c = channel_lookup(id);
-
-	packet_done();
-	if (c == NULL)
-		packet_disconnect("Received close confirmation for "
-		    "out-of-range channel %d.", id);
-	if (c->type != SSH_CHANNEL_CLOSED)
-		packet_disconnect("Received close confirmation for "
-		    "non-closed channel %d (type %d).", id, c->type);
-	channel_free(c);
-}
-
-void
-channel_input_open_confirmation(int type, int plen, void *ctxt)
-{
-	int id, remote_id;
-	Channel *c;
-
-	if (!compat20)
-		packet_integrity_check(plen, 4 + 4, type);
-
-	id = packet_get_int();
-	c = channel_lookup(id);
-
-	if (c==NULL || c->type != SSH_CHANNEL_OPENING)
-		packet_disconnect("Received open confirmation for "
-		    "non-opening channel %d.", id);
-	remote_id = packet_get_int();
-	/* Record the remote channel number and mark that the channel is now open. */
-	c->remote_id = remote_id;
-	c->type = SSH_CHANNEL_OPEN;
-
-	if (compat20) {
-		c->remote_window = packet_get_int();
-		c->remote_maxpacket = packet_get_int();
-		packet_done();
-		if (c->cb_fn != NULL && c->cb_event == type) {
-			debug2("callback start");
-			c->cb_fn(c->self, c->cb_arg);
-			debug2("callback done");
-		}
-		debug("channel %d: open confirm rwindow %d rmax %d", c->self,
-		    c->remote_window, c->remote_maxpacket);
-	}
-}
-
-char *
-reason2txt(int reason)
-{
-	switch(reason) {
-	case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
-		return "administratively prohibited";
-	case SSH2_OPEN_CONNECT_FAILED:
-		return "connect failed";
-	case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
-		return "unknown channel type";
-	case SSH2_OPEN_RESOURCE_SHORTAGE:
-		return "resource shortage";
-	}
-	return "unknown reason";
-}
-
-void
-channel_input_open_failure(int type, int plen, void *ctxt)
-{
-	int id, reason;
-	char *msg = NULL, *lang = NULL;
-	Channel *c;
-
-	if (!compat20)
-		packet_integrity_check(plen, 4, type);
-
-	id = packet_get_int();
-	c = channel_lookup(id);
-
-	if (c==NULL || c->type != SSH_CHANNEL_OPENING)
-		packet_disconnect("Received open failure for "
-		    "non-opening channel %d.", id);
-	if (compat20) {
-		reason = packet_get_int();
-		if (!(datafellows & SSH_BUG_OPENFAILURE)) {
-			msg  = packet_get_string(NULL);
-			lang = packet_get_string(NULL);
-		}
-		packet_done();
-		log("channel %d: open failed: %s%s%s", id,
-		    reason2txt(reason), msg ? ": ": "", msg ? msg : "");
-		if (msg != NULL)
-			xfree(msg);
-		if (lang != NULL)
-			xfree(lang);
-	}
-	/* Free the channel.  This will also close the socket. */
-	channel_free(c);
-}
-
-void
-channel_input_channel_request(int type, int plen, void *ctxt)
-{
-	int id;
-	Channel *c;
-
-	id = packet_get_int();
-	c = channel_lookup(id);
-
-	if (c == NULL ||
-	    (c->type != SSH_CHANNEL_OPEN && c->type != SSH_CHANNEL_LARVAL))
-		packet_disconnect("Received request for "
-		    "non-open channel %d.", id);
-	if (c->cb_fn != NULL && c->cb_event == type) {
-		debug2("callback start");
-		c->cb_fn(c->self, c->cb_arg);
-		debug2("callback done");
-	} else {
-		char *service = packet_get_string(NULL);
-		debug("channel %d: rcvd request for %s", c->self, service);
-		debug("cb_fn %p cb_event %d", c->cb_fn , c->cb_event);
-		xfree(service);
-	}
-}
-
-void
-channel_input_window_adjust(int type, int plen, void *ctxt)
-{
-	Channel *c;
-	int id, adjust;
-
-	if (!compat20)
-		return;
-
-	/* Get the channel number and verify it. */
-	id = packet_get_int();
-	c = channel_lookup(id);
-
-	if (c == NULL || c->type != SSH_CHANNEL_OPEN) {
-		log("Received window adjust for "
-		    "non-open channel %d.", id);
-		return;
-	}
-	adjust = packet_get_int();
-	packet_done();
-	debug2("channel %d: rcvd adjust %d", id, adjust);
-	c->remote_window += adjust;
-}
-
-/*
- * Stops listening for channels, and removes any unix domain sockets that we
- * might have.
- */
-
-void
-channel_stop_listening()
-{
-	int i;
-	Channel *c;
-
-	for (i = 0; i < channels_alloc; i++) {
-		c = channels[i];
-		if (c != NULL) {
-			switch (c->type) {
-			case SSH_CHANNEL_AUTH_SOCKET:
-				close(c->sock);
-				unlink(c->path);
-				channel_free(c);
-				break;
-			case SSH_CHANNEL_PORT_LISTENER:
-			case SSH_CHANNEL_RPORT_LISTENER:
-			case SSH_CHANNEL_X11_LISTENER:
-				close(c->sock);
-				channel_free(c);
-				break;
-			default:
-				break;
-			}
-		}
-	}
-}
-
-/*
- * Closes the sockets/fds of all channels.  This is used to close extra file
- * descriptors after a fork.
- */
-
-void
-channel_close_all()
-{
-	int i;
-
-	for (i = 0; i < channels_alloc; i++)
-		if (channels[i] != NULL)
-			channel_close_fds(channels[i]);
-}
-
-/* Returns true if any channel is still open. */
-
-int
-channel_still_open()
-{
-	int i;
-	Channel *c;
-
-	for (i = 0; i < channels_alloc; i++) {
-		c = channels[i];
-		if (c == NULL)
-			continue;
-		switch (c->type) {
-		case SSH_CHANNEL_X11_LISTENER:
-		case SSH_CHANNEL_PORT_LISTENER:
-		case SSH_CHANNEL_RPORT_LISTENER:
-		case SSH_CHANNEL_CLOSED:
-		case SSH_CHANNEL_AUTH_SOCKET:
-		case SSH_CHANNEL_DYNAMIC:
-		case SSH_CHANNEL_CONNECTING:
-		case SSH_CHANNEL_ZOMBIE:
-			continue;
-		case SSH_CHANNEL_LARVAL:
-			if (!compat20)
-				fatal("cannot happen: SSH_CHANNEL_LARVAL");
-			continue;
-		case SSH_CHANNEL_OPENING:
-		case SSH_CHANNEL_OPEN:
-		case SSH_CHANNEL_X11_OPEN:
-			return 1;
-		case SSH_CHANNEL_INPUT_DRAINING:
-		case SSH_CHANNEL_OUTPUT_DRAINING:
-			if (!compat13)
-				fatal("cannot happen: OUT_DRAIN");
-			return 1;
-		default:
-			fatal("channel_still_open: bad channel type %d", c->type);
-			/* NOTREACHED */
-		}
-	}
-	return 0;
-}
-
-/* Returns the id of an open channel suitable for keepaliving */
-
-int
-channel_find_open()
-{
-	int i;
-	Channel *c;
-
-	for (i = 0; i < channels_alloc; i++) {
-		c = channels[i];
-		if (c == NULL)
-			continue;
-		switch (c->type) {
-		case SSH_CHANNEL_CLOSED:
-		case SSH_CHANNEL_DYNAMIC:
-		case SSH_CHANNEL_X11_LISTENER:
-		case SSH_CHANNEL_PORT_LISTENER:
-		case SSH_CHANNEL_RPORT_LISTENER:
-		case SSH_CHANNEL_OPENING:
-		case SSH_CHANNEL_CONNECTING:
-		case SSH_CHANNEL_ZOMBIE:
-			continue;
-		case SSH_CHANNEL_LARVAL:
-		case SSH_CHANNEL_AUTH_SOCKET:
-		case SSH_CHANNEL_OPEN:
-		case SSH_CHANNEL_X11_OPEN:
-			return i;
-		case SSH_CHANNEL_INPUT_DRAINING:
-		case SSH_CHANNEL_OUTPUT_DRAINING:
-			if (!compat13)
-				fatal("cannot happen: OUT_DRAIN");
-			return i;
-		default:
-			fatal("channel_find_open: bad channel type %d", c->type);
-			/* NOTREACHED */
-		}
-	}
-	return -1;
-}
-
-
-/*
- * Returns a message describing the currently open forwarded connections,
- * suitable for sending to the client.  The message contains crlf pairs for
- * newlines.
- */
-
-char *
-channel_open_message()
-{
-	Buffer buffer;
-	Channel *c;
-	char buf[1024], *cp;
-	int i;
-
-	buffer_init(&buffer);
-	snprintf(buf, sizeof buf, "The following connections are open:\r\n");
-	buffer_append(&buffer, buf, strlen(buf));
-	for (i = 0; i < channels_alloc; i++) {
-		c = channels[i];
-		if (c == NULL)
-			continue;
-		switch (c->type) {
-		case SSH_CHANNEL_X11_LISTENER:
-		case SSH_CHANNEL_PORT_LISTENER:
-		case SSH_CHANNEL_RPORT_LISTENER:
-		case SSH_CHANNEL_CLOSED:
-		case SSH_CHANNEL_AUTH_SOCKET:
-		case SSH_CHANNEL_ZOMBIE:
-			continue;
-		case SSH_CHANNEL_LARVAL:
-		case SSH_CHANNEL_OPENING:
-		case SSH_CHANNEL_CONNECTING:
-		case SSH_CHANNEL_DYNAMIC:
-		case SSH_CHANNEL_OPEN:
-		case SSH_CHANNEL_X11_OPEN:
-		case SSH_CHANNEL_INPUT_DRAINING:
-		case SSH_CHANNEL_OUTPUT_DRAINING:
-			snprintf(buf, sizeof buf, "  #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d)\r\n",
-			    c->self, c->remote_name,
-			    c->type, c->remote_id,
-			    c->istate, buffer_len(&c->input),
-			    c->ostate, buffer_len(&c->output),
-			    c->rfd, c->wfd);
-			buffer_append(&buffer, buf, strlen(buf));
-			continue;
-		default:
-			fatal("channel_open_message: bad channel type %d", c->type);
-			/* NOTREACHED */
-		}
-	}
-	buffer_append(&buffer, "\0", 1);
-	cp = xstrdup(buffer_ptr(&buffer));
-	buffer_free(&buffer);
-	return cp;
-}
-
-/*
- * Initiate forwarding of connections to local port "port" through the secure
- * channel to host:port from remote side.
- */
-int
-channel_request_local_forwarding(u_short listen_port, const char *host_to_connect,
-    u_short port_to_connect, int gateway_ports)
-{
-	return channel_request_forwarding(
-	    NULL, listen_port,
-	    host_to_connect, port_to_connect,
-	    gateway_ports, /*remote_fwd*/ 0);
-}
-
-/*
- * If 'remote_fwd' is true we have a '-R style' listener for protocol 2
- * (SSH_CHANNEL_RPORT_LISTENER).
- */
-int
-channel_request_forwarding(
-    const char *listen_address, u_short listen_port,
-    const char *host_to_connect, u_short port_to_connect,
-    int gateway_ports, int remote_fwd)
-{
-	Channel *c;
-	int success, sock, on = 1, ctype;
-	struct addrinfo hints, *ai, *aitop;
-	char ntop[NI_MAXHOST], strport[NI_MAXSERV];
-	const char *host;
-	struct linger linger;
-
-	success = 0;
-
-	if (remote_fwd) {
-		host = listen_address;
-		ctype = SSH_CHANNEL_RPORT_LISTENER;
-	} else {
-		host = host_to_connect;
-		ctype  =SSH_CHANNEL_PORT_LISTENER;
-	}
-
-	if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) {
-		error("Forward host name too long.");
-		return success;
-	}
-
-	/* XXX listen_address is currently ignored */
-	/*
-	 * getaddrinfo returns a loopback address if the hostname is
-	 * set to NULL and hints.ai_flags is not AI_PASSIVE
-	 */
-	memset(&hints, 0, sizeof(hints));
-	hints.ai_family = IPv4or6;
-	hints.ai_flags = gateway_ports ? AI_PASSIVE : 0;
-	hints.ai_socktype = SOCK_STREAM;
-	snprintf(strport, sizeof strport, "%d", listen_port);
-	if (getaddrinfo(NULL, strport, &hints, &aitop) != 0)
-		packet_disconnect("getaddrinfo: fatal error");
-
-	for (ai = aitop; ai; ai = ai->ai_next) {
-		if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
-			continue;
-		if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
-		    strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
-			error("channel_request_forwarding: getnameinfo failed");
-			continue;
-		}
-		/* Create a port to listen for the host. */
-		sock = socket(ai->ai_family, SOCK_STREAM, 0);
-		if (sock < 0) {
-			/* this is no error since kernel may not support ipv6 */
-			verbose("socket: %.100s", strerror(errno));
-			continue;
-		}
-		/*
-		 * Set socket options.  We would like the socket to disappear
-		 * as soon as it has been closed for whatever reason.
-		 */
-		setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on));
-		linger.l_onoff = 1;
-		linger.l_linger = 5;
-		setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&linger, sizeof(linger));
-		debug("Local forwarding listening on %s port %s.", ntop, strport);
-
-		/* Bind the socket to the address. */
-		if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
-			/* address can be in use ipv6 address is already bound */
-			verbose("bind: %.100s", strerror(errno));
-			close(sock);
-			continue;
-		}
-		/* Start listening for connections on the socket. */
-		if (listen(sock, 5) < 0) {
-			error("listen: %.100s", strerror(errno));
-			close(sock);
-			continue;
-		}
-		/* Allocate a channel number for the socket. */
-		c = channel_new("port listener", ctype, sock, sock, -1,
-		    CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
-		    0, xstrdup("port listener"), 1);
-		if (c == NULL) {
-			error("channel_request_forwarding: channel_new failed");
-			close(sock);
-			continue;
-		}
-		strlcpy(c->path, host, sizeof(c->path));
-		c->host_port = port_to_connect;
-		c->listening_port = listen_port;
-		success = 1;
-	}
-	if (success == 0)
-		error("channel_request_forwarding: cannot listen to port: %d",
-		    listen_port);
-	freeaddrinfo(aitop);
-	return success;
-}
-
-/*
- * Initiate forwarding of connections to port "port" on remote host through
- * the secure channel to host:port from local side.
- */
-
-void
-channel_request_remote_forwarding(u_short listen_port,
-    const char *host_to_connect, u_short port_to_connect)
-{
-	int payload_len, type, success = 0;
-
-	/* Record locally that connection to this host/port is permitted. */
-	if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
-		fatal("channel_request_remote_forwarding: too many forwards");
-
-	/* Send the forward request to the remote side. */
-	if (compat20) {
-		const char *address_to_bind = "0.0.0.0";
-		packet_start(SSH2_MSG_GLOBAL_REQUEST);
-		packet_put_cstring("tcpip-forward");
-		packet_put_char(0);			/* boolean: want reply */
-		packet_put_cstring(address_to_bind);
-		packet_put_int(listen_port);
-		packet_send();
-		packet_write_wait();
-		/* Assume that server accepts the request */
-		success = 1;
-	} else {
-		packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
-		packet_put_int(listen_port);
-		packet_put_cstring(host_to_connect);
-		packet_put_int(port_to_connect);
-		packet_send();
-		packet_write_wait();
-
-		/* Wait for response from the remote side. */
-		type = packet_read(&payload_len);
-		switch (type) {
-		case SSH_SMSG_SUCCESS:
-			success = 1;
-			break;
-		case SSH_SMSG_FAILURE:
-			log("Warning: Server denied remote port forwarding.");
-			break;
-		default:
-			/* Unknown packet */
-			packet_disconnect("Protocol error for port forward request:"
-			    "received packet type %d.", type);
-		}
-	}
-	if (success) {
-		permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect);
-		permitted_opens[num_permitted_opens].port_to_connect = port_to_connect;
-		permitted_opens[num_permitted_opens].listen_port = listen_port;
-		num_permitted_opens++;
-	}
-}
-
-/*
- * This is called after receiving CHANNEL_FORWARDING_REQUEST.  This initates
- * listening for the port, and sends back a success reply (or disconnect
- * message if there was an error).  This never returns if there was an error.
- */
-
-void
-channel_input_port_forward_request(int is_root, int gateway_ports)
-{
-	u_short port, host_port;
-	char *hostname;
-
-	/* Get arguments from the packet. */
-	port = packet_get_int();
-	hostname = packet_get_string(NULL);
-	host_port = packet_get_int();
-
-	/*
-	 * Check that an unprivileged user is not trying to forward a
-	 * privileged port.
-	 */
-	if (port < IPPORT_RESERVED && !is_root)
-		packet_disconnect("Requested forwarding of port %d but user is not root.",
-				  port);
-	/* Initiate forwarding */
-	channel_request_local_forwarding(port, hostname, host_port, gateway_ports);
-
-	/* Free the argument string. */
-	xfree(hostname);
-}
-
-/*
- * Permits opening to any host/port if permitted_opens[] is empty.  This is
- * usually called by the server, because the user could connect to any port
- * anyway, and the server has no way to know but to trust the client anyway.
- */
-void
-channel_permit_all_opens()
-{
-	if (num_permitted_opens == 0)
-		all_opens_permitted = 1;
-}
-
-void
-channel_add_permitted_opens(char *host, int port)
-{
-	if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
-		fatal("channel_request_remote_forwarding: too many forwards");
-	debug("allow port forwarding to host %s port %d", host, port);
-
-	permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
-	permitted_opens[num_permitted_opens].port_to_connect = port;
-	num_permitted_opens++;
-
-	all_opens_permitted = 0;
-}
-
-void
-channel_clear_permitted_opens(void)
-{
-	int i;
-
-	for (i = 0; i < num_permitted_opens; i++)
-		xfree(permitted_opens[i].host_to_connect);
-	num_permitted_opens = 0;
-
-}
-
-
-/* return socket to remote host, port */
-int
-connect_to(const char *host, u_short port)
-{
-	struct addrinfo hints, *ai, *aitop;
-	char ntop[NI_MAXHOST], strport[NI_MAXSERV];
-	int gaierr;
-	int sock = -1;
-
-	memset(&hints, 0, sizeof(hints));
-	hints.ai_family = IPv4or6;
-	hints.ai_socktype = SOCK_STREAM;
-	snprintf(strport, sizeof strport, "%d", port);
-	if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
-		error("connect_to %.100s: unknown host (%s)", host,
-		    gai_strerror(gaierr));
-		return -1;
-	}
-	for (ai = aitop; ai; ai = ai->ai_next) {
-		if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
-			continue;
-		if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
-		    strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
-			error("connect_to: getnameinfo failed");
-			continue;
-		}
-		sock = socket(ai->ai_family, SOCK_STREAM, 0);
-		if (sock < 0) {
-			error("socket: %.100s", strerror(errno));
-			continue;
-		}
-		if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0)
-			fatal("connect_to: F_SETFL: %s", strerror(errno));
-		if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 &&
-		    errno != EINPROGRESS) {
-			error("connect_to %.100s port %s: %.100s", ntop, strport,
-			    strerror(errno));
-			close(sock);
-			continue;	/* fail -- try next */
-		}
-		break; /* success */
-
-	}
-	freeaddrinfo(aitop);
-	if (!ai) {
-		error("connect_to %.100s port %d: failed.", host, port);
-		return -1;
-	}
-	/* success */
-	return sock;
-}
-
-int
-channel_connect_by_listen_adress(u_short listen_port)
-{
-	int i;
-
-	for (i = 0; i < num_permitted_opens; i++)
-		if (permitted_opens[i].listen_port == listen_port)
-			return connect_to(
-			    permitted_opens[i].host_to_connect,
-			    permitted_opens[i].port_to_connect);
-	error("WARNING: Server requests forwarding for unknown listen_port %d",
-	    listen_port);
-	return -1;
-}
-
-/* Check if connecting to that port is permitted and connect. */
-int
-channel_connect_to(const char *host, u_short port)
-{
-	int i, permit;
-
-	permit = all_opens_permitted;
-	if (!permit) {
-		for (i = 0; i < num_permitted_opens; i++)
-			if (permitted_opens[i].port_to_connect == port &&
-			    strcmp(permitted_opens[i].host_to_connect, host) == 0)
-				permit = 1;
-
-	}
-	if (!permit) {
-		log("Received request to connect to host %.100s port %d, "
-		    "but the request was denied.", host, port);
-		return -1;
-	}
-	return connect_to(host, port);
-}
-
-/*
- * This is called after receiving PORT_OPEN message.  This attempts to
- * connect to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION
- * or CHANNEL_OPEN_FAILURE.
- */
-
-void
-channel_input_port_open(int type, int plen, void *ctxt)
-{
-	Channel *c = NULL;
-	u_short host_port;
-	char *host, *originator_string;
-	int remote_id, sock = -1;
-
-	remote_id = packet_get_int();
-	host = packet_get_string(NULL);
-	host_port = packet_get_int();
-
-	if (have_hostname_in_open) {
-		originator_string = packet_get_string(NULL);
-	} else {
-		originator_string = xstrdup("unknown (remote did not supply name)");
-	}
-	packet_done();
-	sock = channel_connect_to(host, host_port);
-	if (sock != -1) {
-		c = channel_new("connected socket",
-		    SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0,
-		    originator_string, 1);
-		if (c == NULL) {
-			error("channel_input_port_open: channel_new failed");
-			close(sock);
-		} else {
-			c->remote_id = remote_id;
-		}
-	}
-	if (c == NULL) {
-		packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
-		packet_put_int(remote_id);
-		packet_send();
-	}
-	xfree(host);
-}
-
-/*
- * Creates an internet domain socket for listening for X11 connections.
- * Returns a suitable value for the DISPLAY variable, or NULL if an error
- * occurs.
- */
-
-#define	NUM_SOCKS	10
-
-char *
-x11_create_display_inet(int screen_number, int x11_display_offset)
-{
-	int display_number, sock;
-	u_short port;
-	struct addrinfo hints, *ai, *aitop;
-	char strport[NI_MAXSERV];
-	int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
-	char display[512];
-	char hostname[MAXHOSTNAMELEN];
-
-	for (display_number = x11_display_offset;
-	     display_number < MAX_DISPLAYS;
-	     display_number++) {
-		port = 6000 + display_number;
-		memset(&hints, 0, sizeof(hints));
-		hints.ai_family = IPv4or6;
-		hints.ai_flags = AI_PASSIVE;		/* XXX loopback only ? */
-		hints.ai_socktype = SOCK_STREAM;
-		snprintf(strport, sizeof strport, "%d", port);
-		if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
-			error("getaddrinfo: %.100s", gai_strerror(gaierr));
-			return NULL;
-		}
-		for (ai = aitop; ai; ai = ai->ai_next) {
-			if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
-				continue;
-			sock = socket(ai->ai_family, SOCK_STREAM, 0);
-			if (sock < 0) {
-				error("socket: %.100s", strerror(errno));
-				return NULL;
-			}
-			if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
-				debug("bind port %d: %.100s", port, strerror(errno));
-				shutdown(sock, SHUT_RDWR);
-				close(sock);
-				for (n = 0; n < num_socks; n++) {
-					shutdown(socks[n], SHUT_RDWR);
-					close(socks[n]);
-				}
-				num_socks = 0;
-				break;
-			}
-			socks[num_socks++] = sock;
-			if (num_socks == NUM_SOCKS)
-				break;
-		}
-		freeaddrinfo(aitop);
-		if (num_socks > 0)
-			break;
-	}
-	if (display_number >= MAX_DISPLAYS) {
-		error("Failed to allocate internet-domain X11 display socket.");
-		return NULL;
-	}
-	/* Start listening for connections on the socket. */
-	for (n = 0; n < num_socks; n++) {
-		sock = socks[n];
-		if (listen(sock, 5) < 0) {
-			error("listen: %.100s", strerror(errno));
-			shutdown(sock, SHUT_RDWR);
-			close(sock);
-			return NULL;
-		}
-	}
-
-	/* Set up a suitable value for the DISPLAY variable. */
-	if (gethostname(hostname, sizeof(hostname)) < 0)
-		fatal("gethostname: %.100s", strerror(errno));
-	snprintf(display, sizeof display, "%.400s:%d.%d", hostname,
-		 display_number, screen_number);
-
-	/* Allocate a channel for each socket. */
-	for (n = 0; n < num_socks; n++) {
-		sock = socks[n];
-		(void) channel_new("x11 listener",
-		    SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
-		    CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
-		    0, xstrdup("X11 inet listener"), 1);
-	}
-
-	/* Return a suitable value for the DISPLAY environment variable. */
-	return xstrdup(display);
-}
-
-#ifndef X_UNIX_PATH
-#define X_UNIX_PATH "/tmp/.X11-unix/X"
-#endif
-
-static
-int
-connect_local_xsocket(u_int dnr)
-{
-	static const char *const x_sockets[] = {
-		X_UNIX_PATH "%u",
-		"/var/X/.X11-unix/X" "%u",
-		"/usr/spool/sockets/X11/" "%u",
-		NULL
-	};
-	int sock;
-	struct sockaddr_un addr;
-	const char *const * path;
-
-	for (path = x_sockets; *path; ++path) {
-		sock = socket(AF_UNIX, SOCK_STREAM, 0);
-		if (sock < 0)
-			error("socket: %.100s", strerror(errno));
-		memset(&addr, 0, sizeof(addr));
-		addr.sun_family = AF_UNIX;
-		snprintf(addr.sun_path, sizeof addr.sun_path, *path, dnr);
-		if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0)
-			return sock;
-		close(sock);
-	}
-	error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
-	return -1;
-}
-
-int
-x11_connect_display(void)
-{
-	int display_number, sock = 0;
-	const char *display;
-	char buf[1024], *cp;
-	struct addrinfo hints, *ai, *aitop;
-	char strport[NI_MAXSERV];
-	int gaierr;
-
-	/* Try to open a socket for the local X server. */
-	display = getenv("DISPLAY");
-	if (!display) {
-		error("DISPLAY not set.");
-		return -1;
-	}
-	/*
-	 * Now we decode the value of the DISPLAY variable and make a
-	 * connection to the real X server.
-	 */
-
-	/*
-	 * Check if it is a unix domain socket.  Unix domain displays are in
-	 * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
-	 */
-	if (strncmp(display, "unix:", 5) == 0 ||
-	    display[0] == ':') {
-		/* Connect to the unix domain socket. */
-		if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) {
-			error("Could not parse display number from DISPLAY: %.100s",
-			      display);
-			return -1;
-		}
-		/* Create a socket. */
-		sock = connect_local_xsocket(display_number);
-		if (sock < 0)
-			return -1;
-
-		/* OK, we now have a connection to the display. */
-		return sock;
-	}
-	/*
-	 * Connect to an inet socket.  The DISPLAY value is supposedly
-	 * hostname:d[.s], where hostname may also be numeric IP address.
-	 */
-	strncpy(buf, display, sizeof(buf));
-	buf[sizeof(buf) - 1] = 0;
-	cp = strchr(buf, ':');
-	if (!cp) {
-		error("Could not find ':' in DISPLAY: %.100s", display);
-		return -1;
-	}
-	*cp = 0;
-	/* buf now contains the host name.  But first we parse the display number. */
-	if (sscanf(cp + 1, "%d", &display_number) != 1) {
-		error("Could not parse display number from DISPLAY: %.100s",
-		      display);
-		return -1;
-	}
-
-	/* Look up the host address */
-	memset(&hints, 0, sizeof(hints));
-	hints.ai_family = IPv4or6;
-	hints.ai_socktype = SOCK_STREAM;
-	snprintf(strport, sizeof strport, "%d", 6000 + display_number);
-	if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
-		error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr));
-		return -1;
-	}
-	for (ai = aitop; ai; ai = ai->ai_next) {
-		/* Create a socket. */
-		sock = socket(ai->ai_family, SOCK_STREAM, 0);
-		if (sock < 0) {
-			debug("socket: %.100s", strerror(errno));
-			continue;
-		}
-		/* Connect it to the display. */
-		if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
-			debug("connect %.100s port %d: %.100s", buf,
-			    6000 + display_number, strerror(errno));
-			close(sock);
-			continue;
-		}
-		/* Success */
-		break;
-	}
-	freeaddrinfo(aitop);
-	if (!ai) {
-		error("connect %.100s port %d: %.100s", buf, 6000 + display_number,
-		    strerror(errno));
-		return -1;
-	}
-	return sock;
-}
-
-/*
- * This is called when SSH_SMSG_X11_OPEN is received.  The packet contains
- * the remote channel number.  We should do whatever we want, and respond
- * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
- */
-
-void
-x11_input_open(int type, int plen, void *ctxt)
-{
-	Channel *c = NULL;
-	int remote_id, sock = 0;
-	char *remote_host;
-
-	debug("Received X11 open request.");
-
-	remote_id = packet_get_int();
-	if (have_hostname_in_open) {
-		remote_host = packet_get_string(NULL);
-	} else {
-		remote_host = xstrdup("unknown (remote did not supply name)");
-	}
-	packet_done();
-
-	/* Obtain a connection to the real X display. */
-	sock = x11_connect_display();
-	if (sock != -1) {
-		/* Allocate a channel for this connection. */
-		c = channel_new("connected x11 socket",
-		    SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
-		    remote_host, 1);
-		if (c == NULL) {
-			error("x11_input_open: channel_new failed");
-			close(sock);
-		} else {
-			c->remote_id = remote_id;
-		}
-	}
-	if (c == NULL) {
-		/* Send refusal to the remote host. */
-		packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
-		packet_put_int(remote_id);
-	} else {
-		/* Send a confirmation to the remote host. */
-		packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
-		packet_put_int(remote_id);
-		packet_put_int(c->self);
-	}
-	packet_send();
-}
-
-/* dummy protocol handler that denies SSH-1 requests (agent/x11) */
-void
-deny_input_open(int type, int plen, void *ctxt)
-{
-	int rchan = packet_get_int();
-	switch(type){
-	case SSH_SMSG_AGENT_OPEN:
-		error("Warning: ssh server tried agent forwarding.");
-		break;
-	case SSH_SMSG_X11_OPEN:
-		error("Warning: ssh server tried X11 forwarding.");
-		break;
-	default:
-		error("deny_input_open: type %d plen %d", type, plen);
-		break;
-	}
-	error("Warning: this is probably a break in attempt by a malicious server.");
-	packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
-	packet_put_int(rchan);
-	packet_send();
-}
-
-/*
- * Requests forwarding of X11 connections, generates fake authentication
- * data, and enables authentication spoofing.
- */
-
-void
-x11_request_forwarding_with_spoofing(int client_session_id,
-    const char *proto, const char *data)
-{
-	u_int data_len = (u_int) strlen(data) / 2;
-	u_int i, value, len;
-	char *new_data;
-	int screen_number;
-	const char *cp;
-	u_int32_t rand = 0;
-
-	cp = getenv("DISPLAY");
-	if (cp)
-		cp = strchr(cp, ':');
-	if (cp)
-		cp = strchr(cp, '.');
-	if (cp)
-		screen_number = atoi(cp + 1);
-	else
-		screen_number = 0;
-
-	/* Save protocol name. */
-	x11_saved_proto = xstrdup(proto);
-
-	/*
-	 * Extract real authentication data and generate fake data of the
-	 * same length.
-	 */
-	x11_saved_data = xmalloc(data_len);
-	x11_fake_data = xmalloc(data_len);
-	for (i = 0; i < data_len; i++) {
-		if (sscanf(data + 2 * i, "%2x", &value) != 1)
-			fatal("x11_request_forwarding: bad authentication data: %.100s", data);
-		if (i % 4 == 0)
-			rand = arc4random();
-		x11_saved_data[i] = value;
-		x11_fake_data[i] = rand & 0xff;
-		rand >>= 8;
-	}
-	x11_saved_data_len = data_len;
-	x11_fake_data_len = data_len;
-
-	/* Convert the fake data into hex. */
-	len = 2 * data_len + 1;
-	new_data = xmalloc(len);
-	for (i = 0; i < data_len; i++)
-		snprintf(new_data + 2 * i, len - 2 * i,
-		    "%02x", (u_char) x11_fake_data[i]);
-
-	/* Send the request packet. */
-	if (compat20) {
-		channel_request_start(client_session_id, "x11-req", 0);
-		packet_put_char(0);	/* XXX bool single connection */
-	} else {
-		packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
-	}
-	packet_put_cstring(proto);
-	packet_put_cstring(new_data);
-	packet_put_int(screen_number);
-	packet_send();
-	packet_write_wait();
-	xfree(new_data);
-}
-
-/* Sends a message to the server to request authentication fd forwarding. */
-
-void
-auth_request_forwarding()
-{
-	packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
-	packet_send();
-	packet_write_wait();
-}
-
-/*
- * Returns the name of the forwarded authentication socket.  Returns NULL if
- * there is no forwarded authentication socket.  The returned value points to
- * a static buffer.
- */
-
-char *
-auth_get_socket_name()
-{
-	return channel_forwarded_auth_socket_name;
-}
-
-/* removes the agent forwarding socket */
-
-void
-cleanup_socket(void)
-{
-	unlink(channel_forwarded_auth_socket_name);
-	rmdir(channel_forwarded_auth_socket_dir);
-}
-
-/*
- * This is called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server.
- * This starts forwarding authentication requests.
- */
-
-int
-auth_input_request_forwarding(struct passwd * pw)
-{
-	Channel *nc;
-	int sock;
-	struct sockaddr_un sunaddr;
-
-	if (auth_get_socket_name() != NULL)
-		fatal("Protocol error: authentication forwarding requested twice.");
-
-	/* Temporarily drop privileged uid for mkdir/bind. */
-	temporarily_use_uid(pw);
-
-	/* Allocate a buffer for the socket name, and format the name. */
-	channel_forwarded_auth_socket_name = xmalloc(MAX_SOCKET_NAME);
-	channel_forwarded_auth_socket_dir = xmalloc(MAX_SOCKET_NAME);
-	strlcpy(channel_forwarded_auth_socket_dir, "/tmp/ssh-XXXXXXXX", MAX_SOCKET_NAME);
-
-	/* Create private directory for socket */
-	if (mkdtemp(channel_forwarded_auth_socket_dir) == NULL) {
-		packet_send_debug("Agent forwarding disabled: mkdtemp() failed: %.100s",
-		    strerror(errno));
-		restore_uid();
-		xfree(channel_forwarded_auth_socket_name);
-		xfree(channel_forwarded_auth_socket_dir);
-		channel_forwarded_auth_socket_name = NULL;
-		channel_forwarded_auth_socket_dir = NULL;
-		return 0;
-	}
-	snprintf(channel_forwarded_auth_socket_name, MAX_SOCKET_NAME, "%s/agent.%d",
-		 channel_forwarded_auth_socket_dir, (int) getpid());
-
-	if (atexit(cleanup_socket) < 0) {
-		int saved = errno;
-		cleanup_socket();
-		packet_disconnect("socket: %.100s", strerror(saved));
-	}
-	/* Create the socket. */
-	sock = socket(AF_UNIX, SOCK_STREAM, 0);
-	if (sock < 0)
-		packet_disconnect("socket: %.100s", strerror(errno));
-
-	/* Bind it to the name. */
-	memset(&sunaddr, 0, sizeof(sunaddr));
-	sunaddr.sun_family = AF_UNIX;
-	strncpy(sunaddr.sun_path, channel_forwarded_auth_socket_name,
-		sizeof(sunaddr.sun_path));
-
-	if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0)
-		packet_disconnect("bind: %.100s", strerror(errno));
-
-	/* Restore the privileged uid. */
-	restore_uid();
-
-	/* Start listening on the socket. */
-	if (listen(sock, 5) < 0)
-		packet_disconnect("listen: %.100s", strerror(errno));
-
-	/* Allocate a channel for the authentication agent socket. */
-	nc = channel_new("auth socket",
-	    SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
-	    CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
-	    0, xstrdup("auth socket"), 1);
-	if (nc == NULL) {
-		error("auth_input_request_forwarding: channel_new failed");
-		close(sock);
-		return 0;
-	}
-	strlcpy(nc->path, channel_forwarded_auth_socket_name, sizeof(nc->path));
-	return 1;
-}
-
-/* This is called to process an SSH_SMSG_AGENT_OPEN message. */
-
-void
-auth_input_open_request(int type, int plen, void *ctxt)
-{
-	Channel *c = NULL;
-	int remote_id, sock;
-	char *dummyname;
-
-	packet_integrity_check(plen, 4, type);
-
-	/* Read the remote channel number from the message. */
-	remote_id = packet_get_int();
-
-	/*
-	 * Get a connection to the local authentication agent (this may again
-	 * get forwarded).
-	 */
-	sock = ssh_get_authentication_socket();
-
-	/*
-	 * If we could not connect the agent, send an error message back to
-	 * the server. This should never happen unless the agent dies,
-	 * because authentication forwarding is only enabled if we have an
-	 * agent.
-	 */
-	if (sock >= 0) {
-		dummyname = xstrdup("authentication agent connection");
-		c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, -1, 0, 0, 0, dummyname, 1);
-		if (c == NULL) {
-			error("auth_input_open_request: channel_new failed");
-			close(sock);
-		} else {
-			c->remote_id = remote_id;
-		}
-	}
-	if (c == NULL) {
-		packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
-		packet_put_int(remote_id);
-	} else {
-		/* Send a confirmation to the remote host. */
-		debug("Forwarding authentication connection.");
-		packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
-		packet_put_int(remote_id);
-		packet_put_int(c->self);
-	}
-	packet_send();
-}
-
-void
-channel_start_open(int id)
-{
-	Channel *c = channel_lookup(id);
-	if (c == NULL) {
-		log("channel_open: %d: bad id", id);
-		return;
-	}
-	debug("send channel open %d", id);
-	packet_start(SSH2_MSG_CHANNEL_OPEN);
-	packet_put_cstring(c->ctype);
-	packet_put_int(c->self);
-	packet_put_int(c->local_window);
-	packet_put_int(c->local_maxpacket);
-}
-void
-channel_open(int id)
-{
-	/* XXX REMOVE ME */
-	channel_start_open(id);
-	packet_send();
-}
-void
-channel_request(int id, char *service, int wantconfirm)
-{
-	channel_request_start(id, service, wantconfirm);
-	packet_send();
-	debug("channel request %d: %s", id, service) ;
-}
-void
-channel_request_start(int id, char *service, int wantconfirm)
-{
-	Channel *c = channel_lookup(id);
-	if (c == NULL) {
-		log("channel_request: %d: bad id", id);
-		return;
-	}
-	packet_start(SSH2_MSG_CHANNEL_REQUEST);
-	packet_put_int(c->remote_id);
-	packet_put_cstring(service);
-	packet_put_char(wantconfirm);
-}
-void
-channel_register_callback(int id, int mtype, channel_callback_fn *fn, void *arg)
-{
-	Channel *c = channel_lookup(id);
-	if (c == NULL) {
-		log("channel_register_callback: %d: bad id", id);
-		return;
-	}
-	c->cb_event = mtype;
-	c->cb_fn = fn;
-	c->cb_arg = arg;
-}
-void
-channel_register_cleanup(int id, channel_callback_fn *fn)
-{
-	Channel *c = channel_lookup(id);
-	if (c == NULL) {
-		log("channel_register_cleanup: %d: bad id", id);
-		return;
-	}
-	c->dettach_user = fn;
-}
-void
-channel_cancel_cleanup(int id)
-{
-	Channel *c = channel_lookup(id);
-	if (c == NULL) {
-		log("channel_cancel_cleanup: %d: bad id", id);
-		return;
-	}
-	c->dettach_user = NULL;
-}
-void
-channel_register_filter(int id, channel_filter_fn *fn)
-{
-	Channel *c = channel_lookup(id);
-	if (c == NULL) {
-		log("channel_register_filter: %d: bad id", id);
-		return;
-	}
-	c->input_filter = fn;
-}
-
-void
-channel_set_fds(int id, int rfd, int wfd, int efd,
-    int extusage, int nonblock)
-{
-	Channel *c = channel_lookup(id);
-	if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
-		fatal("channel_activate for non-larval channel %d.", id);
-	channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
-	c->type = SSH_CHANNEL_OPEN;
-	/* XXX window size? */
-	c->local_window = c->local_window_max = c->local_maxpacket * 2;
-	packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
-	packet_put_int(c->remote_id);
-	packet_put_int(c->local_window);
-	packet_send();
-}
diff --git a/usr.bin/ssh/clientloop.c b/usr.bin/ssh/clientloop.c
index 74926836d22..59a556a8859 100644
--- a/usr.bin/ssh/clientloop.c
+++ b/usr.bin/ssh/clientloop.c
@@ -59,7 +59,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: clientloop.c,v 1.72 2001/05/24 18:57:53 stevesk Exp $");
+RCSID("$OpenBSD: clientloop.c,v 1.73 2001/05/30 12:55:10 markus Exp $");
 
 #include "ssh.h"
 #include "ssh1.h"
@@ -68,7 +68,7 @@ RCSID("$OpenBSD: clientloop.c,v 1.72 2001/05/24 18:57:53 stevesk Exp $");
 #include "packet.h"
 #include "buffer.h"
 #include "compat.h"
-#include "channels.h"
+#include "channel.h"
 #include "dispatch.h"
 #include "buffer.h"
 #include "bufaux.h"
diff --git a/usr.bin/ssh/lib/Makefile b/usr.bin/ssh/lib/Makefile
index fbcd66f59ad..6e9f59425c3 100644
--- a/usr.bin/ssh/lib/Makefile
+++ b/usr.bin/ssh/lib/Makefile
@@ -1,14 +1,16 @@
-#	$OpenBSD: Makefile,v 1.22 2001/04/03 19:53:30 markus Exp $
+#	$OpenBSD: Makefile,v 1.23 2001/05/30 12:55:14 markus Exp $
 
 .PATH:		${.CURDIR}/..
 
 LIB=	ssh
-SRCS=   authfd.c authfile.c bufaux.c buffer.c canohost.c channels.c \
+SRCS=   authfd.c authfile.c bufaux.c buffer.c canohost.c \
+	channel.c channel-close.c channel-input.c channel-core.c \
+	channel-tcpfwd.c channel-auth.c channel-x11.c \
 	cipher.c compat.c compress.c crc32.c deattack.c \
-	hostfile.c log.c match.c mpaux.c nchan.c packet.c readpass.c \
+	hostfile.c log.c match.c mpaux.c packet.c readpass.c \
 	rsa.c tildexpand.c ttymodes.c uidswap.c xmalloc.c atomicio.c \
 	key.c dispatch.c kex.c mac.c uuencode.c misc.c \
-	cli.c rijndael.c ssh-dss.c ssh-rsa.c dh.c kexdh.c kexgex.c
+	cli.c rijndael.c ssh-dss.c ssh-rsa.c dh.c kexdh.c kexgex.c \
 
 NOPROFILE= yes
 NOPIC=	yes
diff --git a/usr.bin/ssh/nchan.h b/usr.bin/ssh/nchan.h
deleted file mode 100644
index d052d474515..00000000000
--- a/usr.bin/ssh/nchan.h
+++ /dev/null
@@ -1,91 +0,0 @@
-/*
- * Copyright (c) 1999 Markus Friedl.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-/* RCSID("$OpenBSD: nchan.h,v 1.12 2001/05/28 23:14:50 markus Exp $"); */
-
-#ifndef NCHAN_H
-#define NCHAN_H
-
-/*
- * SSH Protocol 1.5 aka New Channel Protocol
- * Thanks to Martina, Axel and everyone who left Erlangen, leaving me bored.
- * Written by Markus Friedl in October 1999
- *
- * Protocol versions 1.3 and 1.5 differ in the handshake protocol used for the
- * tear down of channels:
- *
- * 1.3:	strict request-ack-protocol:
- * 	CLOSE	->
- * 		<-  CLOSE_CONFIRM
- *
- * 1.5:	uses variations of:
- * 	IEOF	->
- * 		<-  OCLOSE
- * 		<-  IEOF
- * 	OCLOSE	->
- * 	i.e. both sides have to close the channel
- *
- * See the debugging output from 'ssh -v' and 'sshd -d' of
- * ssh-1.2.27 as an example.
- *
- */
-
-/* ssh-proto-1.5 overloads prot-1.3-message-types */
-#define SSH_MSG_CHANNEL_INPUT_EOF	SSH_MSG_CHANNEL_CLOSE
-#define SSH_MSG_CHANNEL_OUTPUT_CLOSE	SSH_MSG_CHANNEL_CLOSE_CONFIRMATION
-
-/* possible input states */
-#define CHAN_INPUT_OPEN			0x01
-#define CHAN_INPUT_WAIT_DRAIN		0x02
-#define CHAN_INPUT_WAIT_OCLOSE		0x04
-#define CHAN_INPUT_CLOSED		0x08
-
-/* possible output states */
-#define CHAN_OUTPUT_OPEN		0x10
-#define CHAN_OUTPUT_WAIT_DRAIN		0x20
-#define CHAN_OUTPUT_WAIT_IEOF		0x40
-#define CHAN_OUTPUT_CLOSED		0x80
-
-#define CHAN_CLOSE_SENT			0x01
-#define CHAN_CLOSE_RCVD			0x02
-
-/* Channel EVENTS */
-typedef void    chan_event_fn(Channel * c);
-
-/* for the input state */
-extern chan_event_fn	*chan_rcvd_oclose;
-extern chan_event_fn	*chan_read_failed;
-extern chan_event_fn	*chan_ibuf_empty;
-
-/* for the output state */
-extern chan_event_fn	*chan_rcvd_ieof;
-extern chan_event_fn	*chan_write_failed;
-extern chan_event_fn	*chan_obuf_empty;
-
-int chan_is_dead(Channel * c);
-void chan_mark_dead(Channel * c);
-
-void    chan_init_iostates(Channel * c);
-void	chan_init(void);
-#endif
diff --git a/usr.bin/ssh/packet.c b/usr.bin/ssh/packet.c
index 2ceecfb4a81..f99afe8a3f1 100644
--- a/usr.bin/ssh/packet.c
+++ b/usr.bin/ssh/packet.c
@@ -37,7 +37,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: packet.c,v 1.62 2001/05/28 23:58:35 markus Exp $");
+RCSID("$OpenBSD: packet.c,v 1.63 2001/05/30 12:55:11 markus Exp $");
 
 #include "xmalloc.h"
 #include "buffer.h"
@@ -48,7 +48,7 @@ RCSID("$OpenBSD: packet.c,v 1.62 2001/05/28 23:58:35 markus Exp $");
 
 #include "compress.h"
 #include "deattack.h"
-#include "channels.h"
+#include "channel.h"
 
 #include "compat.h"
 #include "ssh1.h"
@@ -245,7 +245,6 @@ void
 packet_set_protocol_flags(u_int protocol_flags)
 {
 	remote_protocol_flags = protocol_flags;
-	channel_set_options((protocol_flags & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) != 0);
 }
 
 /* Returns the remote protocol flags set earlier by the above function. */
diff --git a/usr.bin/ssh/serverloop.c b/usr.bin/ssh/serverloop.c
index 832f9a8e940..960d8f7eb4a 100644
--- a/usr.bin/ssh/serverloop.c
+++ b/usr.bin/ssh/serverloop.c
@@ -35,7 +35,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: serverloop.c,v 1.65 2001/05/08 19:17:31 markus Exp $");
+RCSID("$OpenBSD: serverloop.c,v 1.66 2001/05/30 12:55:12 markus Exp $");
 
 #include "xmalloc.h"
 #include "packet.h"
@@ -43,7 +43,7 @@ RCSID("$OpenBSD: serverloop.c,v 1.65 2001/05/08 19:17:31 markus Exp $");
 #include "log.h"
 #include "servconf.h"
 #include "sshpty.h"
-#include "channels.h"
+#include "channel.h"
 #include "compat.h"
 #include "ssh1.h"
 #include "ssh2.h"
diff --git a/usr.bin/ssh/session.c b/usr.bin/ssh/session.c
index af4fffabde0..1e1a94a9420 100644
--- a/usr.bin/ssh/session.c
+++ b/usr.bin/ssh/session.c
@@ -33,7 +33,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: session.c,v 1.76 2001/05/19 00:36:40 djm Exp $");
+RCSID("$OpenBSD: session.c,v 1.77 2001/05/30 12:55:13 markus Exp $");
 
 #include "ssh.h"
 #include "ssh1.h"
@@ -45,8 +45,7 @@ RCSID("$OpenBSD: session.c,v 1.76 2001/05/19 00:36:40 djm Exp $");
 #include "mpaux.h"
 #include "uidswap.h"
 #include "compat.h"
-#include "channels.h"
-#include "nchan.h"
+#include "channel.h"
 #include "bufaux.h"
 #include "auth.h"
 #include "auth-options.h"
diff --git a/usr.bin/ssh/ssh.c b/usr.bin/ssh/ssh.c
index 0d540edf7fe..afb468eee69 100644
--- a/usr.bin/ssh/ssh.c
+++ b/usr.bin/ssh/ssh.c
@@ -39,7 +39,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: ssh.c,v 1.120 2001/05/28 08:04:39 markus Exp $");
+RCSID("$OpenBSD: ssh.c,v 1.121 2001/05/30 12:55:13 markus Exp $");
 
 #include <openssl/evp.h>
 #include <openssl/err.h>
@@ -53,7 +53,7 @@ RCSID("$OpenBSD: ssh.c,v 1.120 2001/05/28 08:04:39 markus Exp $");
 #include "packet.h"
 #include "buffer.h"
 #include "uidswap.h"
-#include "channels.h"
+#include "channel.h"
 #include "key.h"
 #include "authfd.h"
 #include "authfile.h"
diff --git a/usr.bin/ssh/ssh1.h b/usr.bin/ssh/ssh1.h
index 770c5e4b021..98d1dc9303c 100644
--- a/usr.bin/ssh/ssh1.h
+++ b/usr.bin/ssh/ssh1.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ssh1.h,v 1.2 2001/01/29 01:58:18 niklas Exp $	*/
+/*	$OpenBSD: ssh1.h,v 1.3 2001/05/30 12:55:13 markus Exp $	*/
 
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
@@ -66,6 +66,10 @@
 #define SSH_CMSG_HAVE_KERBEROS_TGT		44	/* credentials (s) */
 #define SSH_CMSG_HAVE_AFS_TOKEN			65	/* token (s) */
 
+/* protocol version 1.5 overloads some version 1.3 message types */
+#define SSH_MSG_CHANNEL_INPUT_EOF	SSH_MSG_CHANNEL_CLOSE
+#define SSH_MSG_CHANNEL_OUTPUT_CLOSE	SSH_MSG_CHANNEL_CLOSE_CONFIRMATION
+
 /*
  * Authentication methods.  New types can be added, but old types should not
  * be removed for compatibility.  The maximum allowed value is 31.
@@ -83,4 +87,3 @@
 /* Protocol flags.  These are bit masks. */
 #define SSH_PROTOFLAG_SCREEN_NUMBER	1	/* X11 forwarding includes screen */
 #define SSH_PROTOFLAG_HOST_IN_FWD_OPEN	2	/* forwarding opens contain host */
-