Import hostated, the host status daemon. This daemon will monitor

remote hosts and dynamically alter pf(4) tables and redirection rules
for active server load balancing.  The daemon has been written by
Pierre-Yves Ritschard (pyr at spootnik.org) and was formerly known as
"slbd".

The daemon is fully functional but it still needs some work and
cleanup so we don't link it to the build yet.  Some TODOs are a
partial rewrite of the check_* routines (use libevent whenever we
can), improvement of the manpages, and general knf and cleanup.

ok deraadt@ claudio@

1 files changed, 340 insertions, 0 deletions

diff --git a/usr.sbin/relayd/control.c b/usr.sbin/relayd/control.c
new file mode 100644
index 00000000000..2f994e458f4
--- /dev/null
+++ b/usr.sbin/relayd/control.c
@@ -0,0 +1,340 @@
+/*	$OpenBSD: control.c,v 1.1 2006/12/16 11:45:07 reyk Exp $	*/
+
+/*
+ * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/queue.h>
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <net/if.h>
+#include <errno.h>
+#include <event.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <signal.h>
+
+#include "hostated.h"
+
+#define	CONTROL_BACKLOG	5
+
+struct ctl_connlist ctl_conns;
+
+int control_imsg_relay(struct imsg *imsg);
+
+struct ctl_conn	*control_connbyfd(int);
+struct ctl_conn	*control_connbypid(pid_t);
+void		 control_close(int);
+
+int
+control_init(void)
+{
+	struct sockaddr_un	 sun;
+	int			 fd;
+	mode_t			 old_umask;
+
+	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
+		log_warn("control_init: socket");
+		return (-1);
+	}
+
+	bzero(&sun, sizeof(sun));
+	sun.sun_family = AF_UNIX;
+	strlcpy(sun.sun_path, HOSTATED_SOCKET, sizeof(sun.sun_path));
+
+	if (unlink(HOSTATED_SOCKET) == -1)
+		if (errno != ENOENT) {
+			log_warn("control_init: unlink %s", HOSTATED_SOCKET);
+			close(fd);
+			return (-1);
+		}
+
+	old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
+	if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
+		log_warn("control_init: bind: %s", HOSTATED_SOCKET);
+		close(fd);
+		umask(old_umask);
+		return (-1);
+	}
+	umask(old_umask);
+
+	if (chmod(HOSTATED_SOCKET, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) {
+		log_warn("control_init: chmod");
+		close(fd);
+		(void)unlink(HOSTATED_SOCKET);
+		return (-1);
+	}
+
+	session_socket_blockmode(fd, BM_NONBLOCK);
+	control_state.fd = fd;
+
+	return (0);
+}
+
+int
+control_listen(void)
+{
+
+	if (listen(control_state.fd, CONTROL_BACKLOG) == -1) {
+		log_warn("control_listen: listen");
+		return (-1);
+	}
+
+	event_set(&control_state.ev, control_state.fd, EV_READ | EV_PERSIST,
+	    control_accept, NULL);
+	event_add(&control_state.ev, NULL);
+
+	return (0);
+}
+
+void
+control_cleanup(void)
+{
+
+	unlink(HOSTATED_SOCKET);
+}
+
+/* ARGSUSED */
+void
+control_accept(int listenfd, short event, void *arg)
+{
+	int			 connfd;
+	socklen_t		 len;
+	struct sockaddr_un	 sun;
+	struct ctl_conn		*c;
+
+	len = sizeof(sun);
+	if ((connfd = accept(listenfd,
+	    (struct sockaddr *)&sun, &len)) == -1) {
+		if (errno != EWOULDBLOCK && errno != EINTR)
+			log_warn("control_accept");
+		return;
+	}
+
+	session_socket_blockmode(connfd, BM_NONBLOCK);
+
+	if ((c = malloc(sizeof(struct ctl_conn))) == NULL) {
+		log_warn("control_accept");
+		return;
+	}
+
+	imsg_init(&c->ibuf, connfd, control_dispatch_imsg);
+	c->ibuf.events = EV_READ;
+	event_set(&c->ibuf.ev, c->ibuf.fd, c->ibuf.events,
+	    c->ibuf.handler, &c->ibuf);
+	event_add(&c->ibuf.ev, NULL);
+
+	TAILQ_INSERT_TAIL(&ctl_conns, c, entry);
+}
+
+struct ctl_conn *
+control_connbyfd(int fd)
+{
+	struct ctl_conn	*c;
+
+	for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->ibuf.fd != fd;
+	    c = TAILQ_NEXT(c, entry))
+		;	/* nothing */
+
+	return (c);
+}
+
+struct ctl_conn *
+control_connbypid(pid_t pid)
+{
+	struct ctl_conn	*c;
+
+	for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->ibuf.pid != pid;
+	    c = TAILQ_NEXT(c, entry))
+		;	/* nothing */
+
+	return (c);
+}
+
+void
+control_close(int fd)
+{
+	struct ctl_conn	*c;
+
+	if ((c = control_connbyfd(fd)) == NULL)
+		log_warn("control_close: fd %d: not found", fd);
+
+	msgbuf_clear(&c->ibuf.w);
+	TAILQ_REMOVE(&ctl_conns, c, entry);
+
+	event_del(&c->ibuf.ev);
+	close(c->ibuf.fd);
+	free(c);
+}
+
+/* ARGSUSED */
+void
+control_dispatch_imsg(int fd, short event, void *arg)
+{
+	struct ctl_conn		*c;
+	struct imsg	 	 imsg;
+	objid_t			 id;
+	int		 	 n;
+
+	if ((c = control_connbyfd(fd)) == NULL) {
+		log_warn("control_dispatch_imsg: fd %d: not found", fd);
+		return;
+	}
+
+	switch (event) {
+	case EV_READ:
+		if ((n = imsg_read(&c->ibuf)) <= 0) {
+			control_close(fd);
+			return;
+		}
+		break;
+	case EV_WRITE:
+		if (msgbuf_write(&c->ibuf.w) < 0) {
+			control_close(fd);
+			return;
+		}
+		imsg_event_add(&c->ibuf);
+		return;
+	default:
+		fatalx("unknown event");
+	}
+
+	for (;;) {
+		if ((n = imsg_get(&c->ibuf, &imsg)) == -1) {
+			control_close(fd);
+			return;
+		}
+
+		if (n == 0)
+			break;
+
+		switch (imsg.hdr.type) {
+		case IMSG_CTL_SHOW_SUM:
+			show(c);
+			break;
+		case IMSG_CTL_SERVICE_DISABLE:
+			if (imsg.hdr.len != IMSG_HEADER_SIZE + sizeof(id))
+				fatalx("invalid imsg header len");
+			memcpy(&id, imsg.data, sizeof(id));
+			if (disable_service(c, id))
+				imsg_compose(&c->ibuf, IMSG_CTL_FAIL, 0, 0,
+					     NULL, 0);
+			else
+				imsg_compose(&c->ibuf, IMSG_CTL_OK, 0, 0,
+					     NULL, 0);
+			break;
+		case IMSG_CTL_SERVICE_ENABLE:
+			if (imsg.hdr.len != IMSG_HEADER_SIZE + sizeof(id))
+				fatalx("invalid imsg header len");
+			memcpy(&id, imsg.data, sizeof(id));
+			if (enable_service(c, id))
+				imsg_compose(&c->ibuf, IMSG_CTL_FAIL, 0, 0,
+					     NULL, 0);
+			else
+				imsg_compose(&c->ibuf, IMSG_CTL_OK, 0, 0,
+					     NULL, 0);
+			break;
+		case IMSG_CTL_TABLE_DISABLE:
+			if (imsg.hdr.len != IMSG_HEADER_SIZE + sizeof(id))
+				fatalx("invalid imsg header len");
+			memcpy(&id, imsg.data, sizeof(id));
+			if (disable_table(c, id))
+				imsg_compose(&c->ibuf, IMSG_CTL_FAIL, 0, 0,
+					     NULL, 0);
+			else
+				imsg_compose(&c->ibuf, IMSG_CTL_OK, 0, 0,
+					     NULL, 0);
+			break;
+		case IMSG_CTL_TABLE_ENABLE:
+			if (imsg.hdr.len != IMSG_HEADER_SIZE + sizeof(id))
+				fatalx("invalid imsg header len");
+			memcpy(&id, imsg.data, sizeof(id));
+			if (enable_table(c, id))
+				imsg_compose(&c->ibuf, IMSG_CTL_FAIL, 0, 0,
+					     NULL, 0);
+			else
+				imsg_compose(&c->ibuf, IMSG_CTL_OK, 0, 0,
+					     NULL, 0);
+			break;
+		case IMSG_CTL_HOST_DISABLE:
+			if (imsg.hdr.len != IMSG_HEADER_SIZE + sizeof(id))
+				fatalx("invalid imsg header len");
+			memcpy(&id, imsg.data, sizeof(id));
+			if (disable_host(c, id))
+				imsg_compose(&c->ibuf, IMSG_CTL_FAIL, 0, 0,
+					     NULL, 0);
+			else
+				imsg_compose(&c->ibuf, IMSG_CTL_OK, 0, 0,
+					     NULL, 0);
+			break;
+		case IMSG_CTL_HOST_ENABLE:
+			if (imsg.hdr.len != IMSG_HEADER_SIZE + sizeof(id))
+				fatalx("invalid imsg header len");
+			memcpy(&id, imsg.data, sizeof(id));
+			if (enable_host(c, id))
+				imsg_compose(&c->ibuf, IMSG_CTL_FAIL, 0, 0,
+					     NULL, 0);
+			else
+				imsg_compose(&c->ibuf, IMSG_CTL_OK, 0, 0,
+					     NULL, 0);
+			break;
+		case IMSG_CTL_SHUTDOWN:
+		case IMSG_CTL_RELOAD:
+			imsg_compose(&c->ibuf, IMSG_CTL_FAIL, 0, 0, NULL, 0);
+			break;
+		default:
+			log_debug("control_dispatch_imsg: "
+			    "error handling imsg %d", imsg.hdr.type);
+			break;
+		}
+		imsg_free(&imsg);
+	}
+
+	imsg_event_add(&c->ibuf);
+}
+
+int
+control_imsg_relay(struct imsg *imsg)
+{
+	struct ctl_conn	*c;
+
+	if ((c = control_connbypid(imsg->hdr.pid)) == NULL)
+		return (0);
+
+	return (imsg_compose(&c->ibuf, imsg->hdr.type, 0, imsg->hdr.pid,
+	    imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE));
+}
+
+void
+session_socket_blockmode(int fd, enum blockmodes bm)
+{
+	int	flags;
+
+	if ((flags = fcntl(fd, F_GETFL, 0)) == -1)
+		fatal("fnctl F_GETFL");
+
+	if (bm == BM_NONBLOCK)
+		flags |= O_NONBLOCK;
+	else
+		flags &= ~O_NONBLOCK;
+
+	if ((flags = fcntl(fd, F_SETFL, flags)) == -1)
+		fatal("fnctl F_SETFL");
+}