File bind-to-local-hostname.patch of Package csync2

Index: csync2-1.34/conn.c
===================================================================
--- csync2-1.34.orig/conn.c
+++ csync2-1.34/conn.c
@@ -50,7 +50,9 @@ SSL *conn_ssl;
 int conn_open(const char *peername)
 {
         struct sockaddr_in sin;
+	struct sockaddr_in sme;
         struct hostent *hp;
+	struct hostent *me;
 	int on = 1;
 
         hp = gethostbyname(peername);
@@ -69,6 +71,23 @@ int conn_open(const char *peername)
         bcopy(hp->h_addr, &sin.sin_addr, hp->h_length);
         sin.sin_port = htons(csync_port);
 
+	/* Try to bind to IP address of local hostname, else in cases where
+	 * there's multiple local IPs on the same subnet, we might autobind
+	 * to the wrong one, and the remote csync2 instance will fail because
+	 * it verifies the expected hostname against the initiating IP.
+	 * If the explicit bind fails for some reason though, we'll still
+	 * try to connect (it might work, and it can't hurt...).
+	 */
+	me = gethostbyname(myhostname);
+	if (me) {
+		sme.sin_family = me->h_addrtype;
+		bcopy(me->h_addr, &sme.sin_addr, me->h_length);
+		sme.sin_port = 0; /* random port */
+		if (bind(conn_fd_in, (struct sockaddr *)&sme, sizeof(sme)) < 0) {
+			csync_debug(1, "Can't bind local socket (attempting connect anyway).\n");
+		}
+	}
+
         if (connect(conn_fd_in, (struct sockaddr *)&sin, sizeof (sin)) < 0) {
                 csync_debug(1, "Can't connect to remote host.\n");
 		close(conn_fd_in); conn_fd_in = -1;