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, 109 insertions, 0 deletions

diff --git a/usr.sbin/relayd/check_tcp.c b/usr.sbin/relayd/check_tcp.c
new file mode 100644
index 00000000000..5ef386731f9
--- /dev/null
+++ b/usr.sbin/relayd/check_tcp.c
@@ -0,0 +1,109 @@
+/*	$OpenBSD: check_tcp.c,v 1.1 2006/12/16 11:45:07 reyk Exp $	*/
+
+/*
+ * Copyright (c) 2006 Pierre-Yves Ritschard <pyr@spootnik.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/types.h>
+#include <sys/queue.h>
+#include <sys/socket.h>
+#include <sys/param.h>
+#include <netinet/in.h>
+#include <net/if.h>
+#include <limits.h>
+#include <event.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+#include "hostated.h"
+
+int
+check_tcp(struct host *host, struct table *table)
+{
+	int	sock;
+
+	if ((sock = tcp_connect(host, table)) <= 0)
+		return (sock);
+	close(sock);
+	return (HOST_UP);
+}
+
+int
+tcp_connect(struct host *host, struct table *table)
+{
+	int		s;
+	socklen_t	len;
+	struct timeval	tv;
+	struct sockaddr	sa;
+	fd_set		fdset;
+
+	switch (host->ss.ss_family) {
+	case AF_INET:
+		((struct sockaddr_in *)&host->ss)->sin_port =
+			htons(table->port);
+		break;
+	case AF_INET6:
+		((struct sockaddr_in6 *)&host->ss)->sin6_port =
+			htons(table->port);
+		break;
+	}
+
+	len = ((struct sockaddr *)&host->ss)->sa_len;
+
+	if ((s = socket(host->ss.ss_family, SOCK_STREAM, 0)) == -1)
+		fatal("check_tcp: cannot create socket");
+
+	if (fcntl(s, F_SETFL, O_NONBLOCK) == -1)
+		fatal("check_tcp: cannot set non blocking socket");
+
+	if (connect(s, (struct sockaddr *)&host->ss, len) == -1) {
+		if (errno != EINPROGRESS && errno != EWOULDBLOCK) {
+			close(s);
+			return (HOST_DOWN);
+		}
+	} else
+		return (s);
+
+	tv.tv_sec = table->timeout / 1000;
+	tv.tv_usec = table->timeout % 1000;
+	FD_ZERO(&fdset);
+	FD_SET(s, &fdset);
+
+	switch(select(s + 1, NULL, &fdset, NULL, &tv)) {
+	case -1:
+		if (errno != EINTR)
+			fatal("check_tcp: select");
+		else
+			return(HOST_UNKNOWN);
+	case 0:
+		close(s);
+		return (HOST_DOWN);
+	default:
+		if (getpeername(s, &sa, &len) == -1) {
+			if (errno == ENOTCONN) {
+				close(s);
+				return (HOST_DOWN);
+			} else {
+				log_debug("check_tcp: unknown peername");
+				close(s);
+				return (HOST_UNKNOWN);
+			}
+		} else
+			return (s);
+	}
+	return (HOST_UNKNOWN);
+}