Fix hostname guessing to work when some stupid DNS server resolves 0.0.0.0

Also, fix names containing a @ to work right

src/mod/event_handlers/mod_erlang_event/ei_helpers.c

@@ -327,6 +327,8 @@ switch_status_t initialise_ei(struct ei_cnode_s *ec)
 	struct hostent *nodehost;
 	char thishostname[EI_MAXHOSTNAMELEN + 1] = "";
 	char thisnodename[MAXNODELEN + 1];
+	char thisalivename[MAXNODELEN + 1];
+	char *atsign;
 
 	/* zero out the struct before we use it */
 	memset(&server_addr, 0, sizeof(server_addr));
@@ -345,18 +347,23 @@ switch_status_t initialise_ei(struct ei_cnode_s *ec)
 	server_addr.sin_family = AF_INET;
 	server_addr.sin_port = htons(prefs.port);
 
-	if (strchr(prefs.nodename, '@')) {
+	/* copy the prefs.nodename into something we can modify */
+	strncpy(thisalivename, prefs.nodename, MAXNODELEN);
+
+	if ((atsign = strchr(thisalivename, '@'))) {
 		/* we got a qualified node name, don't guess the host/domain */
 		snprintf(thisnodename, MAXNODELEN + 1, "%s", prefs.nodename);
+		/* truncate the alivename at the @ */
+		*atsign = '\0';
 	} else {
 #ifdef WIN32
 		if ((nodehost = gethostbyaddr((const char *) &server_addr.sin_addr.s_addr, sizeof(server_addr.sin_addr.s_addr), AF_INET)))
 #else
-			if ((nodehost = gethostbyaddr((const char *) &server_addr.sin_addr.s_addr, sizeof(server_addr.sin_addr.s_addr), AF_INET)))
+		if ((nodehost = gethostbyaddr((const char *) &server_addr.sin_addr.s_addr, sizeof(server_addr.sin_addr.s_addr), AF_INET)))
 #endif
-				memcpy(thishostname, nodehost->h_name, EI_MAXHOSTNAMELEN);
+			memcpy(thishostname, nodehost->h_name, EI_MAXHOSTNAMELEN);
 
-		if (zstr_buf(thishostname)) {
+		if (zstr_buf(thishostname) || !strncasecmp(prefs.ip, "0.0.0.0", 7)) {
 			gethostname(thishostname, EI_MAXHOSTNAMELEN);
 		}
 
@@ -380,7 +387,7 @@ switch_status_t initialise_ei(struct ei_cnode_s *ec)
 
 
 	/* init the ei stuff */
-	if (ei_connect_xinit(ec, thishostname, prefs.nodename, thisnodename, (Erl_IpAddr) (&server_addr.sin_addr.s_addr), prefs.cookie, 0) < 0) {
+	if (ei_connect_xinit(ec, thishostname, thisalivename, thisnodename, (Erl_IpAddr) (&server_addr.sin_addr.s_addr), prefs.cookie, 0) < 0) {
 		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Failed to init ei connection\n");
 		return SWITCH_STATUS_FALSE;
 	}