chan_iax2: Fix Binding To Multiple Addresses Again

When reworking chan_iax2 for IPv6, the ability to bind to multiple addresses
was removed by mistake.  This patch restores this functionality and adds notes
about IPv6 addresses in the sample config.

(closes issue ASTERISK-22741)
Reported by: Joshua Colp
Tested by: Michael L. Young
Patches:
    asterisk-22741-fix-binding-multiple-addr.diff
                                     uploaded by Michael L. Young (license 5026)

Review: https://reviewboard.asterisk.org/r/2945/
........

Merged revisions 401488 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@401489 65c4cc65-6c06-0410-ace0-fbb531ad65f3

2 files changed, 28 insertions, 18 deletions

diff --git a/channels/chan_iax2.c b/channels/chan_iax2.c
index 24ce54ac0..1d0c3169e 100644
--- a/channels/chan_iax2.c
+++ b/channels/chan_iax2.c
@@ -13256,7 +13256,6 @@ static int set_config(const char *config_file, int reload, int forced)
 			else if (ast_parse_arg(v->value, PARSE_UINT32 | PARSE_IN_RANGE, &portno, 1024, 65535)) {
 				portno = IAX_DEFAULT_PORTNO;
 			}
-			ast_sockaddr_set_port(&bindaddr, portno);
 		} else if (!strcasecmp(v->name, "pingtime")){
 			ping_time = atoi(v->value);
 		}
@@ -13318,18 +13317,28 @@ static int set_config(const char *config_file, int reload, int forced)
 			if (reload) {
 				ast_log(LOG_NOTICE, "Ignoring bindaddr on reload\n");
 			} else {
-				/* remember port if it has already been set */
-				int setport = ast_sockaddr_port(&bindaddr);
 
-				if (ast_parse_arg(v->value, PARSE_ADDR | PARSE_PORT_IGNORE, NULL)) {
-					ast_log(LOG_WARNING, "Invalid address '%s' specified, default '%s' will be used\n", v->value,
-						ast_sockaddr_stringify(&bindaddr));
-				} else {
-					ast_sockaddr_parse(&bindaddr, v->value, PARSE_PORT_IGNORE);
-				}
+				if (!ast_parse_arg(v->value, PARSE_ADDR, NULL)) {
+
+					ast_sockaddr_parse(&bindaddr, v->value, 0);
+
+					if (!ast_sockaddr_port(&bindaddr)) {
+						ast_sockaddr_set_port(&bindaddr, portno);
+					}
+
+					if (!(ns = ast_netsock_bindaddr(netsock, io, &bindaddr, qos.tos, qos.cos, socket_read, NULL))) {
+						ast_log(LOG_WARNING, "Unable to apply binding to '%s' at line %d\n", v->value, v->lineno);
+					} else {
+						ast_verb(2, "Binding IAX2 to address %s\n", ast_sockaddr_stringify(&bindaddr));
 
-				if (setport) {
-					ast_sockaddr_set_port(&bindaddr, setport);
+						if (defaultsockfd < 0) {
+							defaultsockfd = ast_netsock_sockfd(ns);
+						}
+						ast_netsock_unref(ns);
+					}
+
+				} else {
+					ast_log(LOG_WARNING, "Invalid address '%s' specified, at line %d\n", v->value, v->lineno);
 				}
 			}
 		} else if (!strcasecmp(v->name, "authdebug")) {
@@ -13528,15 +13537,14 @@ static int set_config(const char *config_file, int reload, int forced)
 		network_change_stasis_unsubscribe();
 	}
 
-	if (!ast_sockaddr_port(&bindaddr)) {
-		ast_sockaddr_set_port(&bindaddr, IAX_DEFAULT_PORTNO);
-	}
-
 	if (defaultsockfd < 0) {
+
+		ast_sockaddr_set_port(&bindaddr, portno);
+
 		if (!(ns = ast_netsock_bindaddr(netsock, io, &bindaddr, qos.tos, qos.cos, socket_read, NULL))) {
 			ast_log(LOG_ERROR, "Unable to create network socket: %s\n", strerror(errno));
 		} else {
-			ast_verb(2, "Binding IAX2 to address %s\n", ast_sockaddr_stringify(&bindaddr));
+			ast_verb(2, "Binding IAX2 to default address %s\n", ast_sockaddr_stringify(&bindaddr));
 			defaultsockfd = ast_netsock_sockfd(ns);
 			ast_netsock_unref(ns);
 		}
diff --git a/configs/iax.conf.sample b/configs/iax.conf.sample
index d5ff72469..b74adc4b0 100644
--- a/configs/iax.conf.sample
+++ b/configs/iax.conf.sample
@@ -22,11 +22,13 @@
 ;bindport=4569           ; The default port to listen on
                          ; NOTE: bindport must be specified BEFORE bindaddr or
                          ; may be specified on a specific bindaddr if followed by
-                         ; colon and port (e.g. bindaddr=192.168.0.1:4569)
+                         ; colon and port (e.g. bindaddr=192.168.0.1:4569) or for
+                         ; IPv6 the address needs to be in brackets then colon
+                         ; and port (e.g. bindaddr=[2001:db8::1]:4569).
 
 ;bindaddr=192.168.0.1    ; You can specify 'bindaddr' more than once to bind to
                          ; multiple addresses, but the first will be the
-                         ; default.
+                         ; default. IPv6 addresses are accepted.
 
 ;
 ; Set 'iaxcompat' to yes if you plan to use layered switches or some other