Fix For Not Overriding The Default Settings In chan_sip

The initial report was that the "nat" setting in the [general] section was not
having any effect in overriding the default setting.  Upon confirming that this
was happening and looking into what was causing this, it was discovered that
other default settings would not be overriden as well.

This patch works similar to what occurs in build_peer().  We create a temporary
ast_flags structure and using a mask, we override the default settings with
whatever is set in the [general] section.

In the bug report, the reporter who helped to test this patch noted that the
directmedia settings were being overriden properly as well as the nat settings.

(closes issue ASTERISK-21225)
Reported by: Alexandre Vezina
Tested by: Alexandre Vezina, Michael L. Young
Patches:
  asterisk-21225-handle-options-default-prob_1.8_v4.diff.diff
						Michael L. Young (license 5026)

Review: https://reviewboard.asterisk.org/r/2386/


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@385008 65c4cc65-6c06-0410-ace0-fbb531ad65f3

UPGRADE.txt

@@ -18,6 +18,10 @@
 ===
 ===========================================================
 
+from 1.8.22.0 to 1.8.23.0:
+* The default settings for chan_sip are now overriden properly by the general
+  settings in sip.conf.  Please look over your settings upon upgrading.
+
 from 1.8.21.0 to 1.8.22.0:
 * Added the 'n' option to MeetMe to prevent application of the DENOISE function
   to a channel joining a conference. Some channel drivers that vary the number

channels/chan_sip.c

@@ -27500,16 +27500,13 @@ static int handle_common_options(struct ast_flags *flags, struct ast_flags *mask
 		}
 	} else if (!strcasecmp(v->name, "nat")) {
 		ast_set_flag(&mask[0], SIP_NAT_FORCE_RPORT);
-		ast_set_flag(&flags[0], SIP_NAT_FORCE_RPORT); /* Default to "force_rport" */
-		if (!strcasecmp(v->value, "no")) {
-			ast_clear_flag(&flags[0], SIP_NAT_FORCE_RPORT);
-		} else if (!strcasecmp(v->value, "yes")) {
-			/* We've already defaulted to force_rport */
 		ast_set_flag(&mask[1], SIP_PAGE2_SYMMETRICRTP);
+		if (!strcasecmp(v->value, "yes")) {
+			ast_set_flag(&flags[0], SIP_NAT_FORCE_RPORT);
 			ast_set_flag(&flags[1], SIP_PAGE2_SYMMETRICRTP);
+		} else if (!strcasecmp(v->value, "force_rport")) {
+			ast_set_flag(&flags[0], SIP_NAT_FORCE_RPORT);
 		} else if (!strcasecmp(v->value, "comedia")) {
-			ast_clear_flag(&flags[0], SIP_NAT_FORCE_RPORT);
-			ast_set_flag(&mask[1], SIP_PAGE2_SYMMETRICRTP);
 			ast_set_flag(&flags[1], SIP_PAGE2_SYMMETRICRTP);
 		}
 	} else if (!strcasecmp(v->name, "directmedia") || !strcasecmp(v->name, "canreinvite")) {
@@ -28659,7 +28656,8 @@ static int reload_config(enum channelreloadreason reason)
 	struct sip_peer *peer;
 	char *cat, *stringp, *context, *oldregcontext;
 	char newcontexts[AST_MAX_CONTEXT], oldcontexts[AST_MAX_CONTEXT];
-	struct ast_flags dummy[2];
+	struct ast_flags mask[3] = {{0}};
+	struct ast_flags setflags[3] = {{0}};
 	struct ast_flags config_flags = { reason == CHANNEL_MODULE_LOAD ? 0 : ast_test_flag(&global_flags[1], SIP_PAGE2_RTCACHEFRIENDS) ? 0 : CONFIG_FLAG_FILEUNCHANGED };
 	int auto_sip_domains = FALSE;
 	struct ast_sockaddr old_bindaddr = bindaddr;
@@ -28894,10 +28892,10 @@ static int reload_config(enum channelreloadreason reason)
 
 	/* Read the [general] config section of sip.conf (or from realtime config) */
 	for (v = ast_variable_browse(cfg, "general"); v; v = v->next) {
-		if (handle_common_options(&global_flags[0], &dummy[0], v)) {
+		if (handle_common_options(&setflags[0], &mask[0], v)) {
 			continue;
 		}
-		if (handle_t38_options(&global_flags[0], &dummy[0], v, &global_t38_maxdatagram)) {
+		if (handle_t38_options(&setflags[0], &mask[0], v, &global_t38_maxdatagram)) {
 			continue;
 		}
 		/* handle jb conf */
@@ -29381,6 +29379,11 @@ static int reload_config(enum channelreloadreason reason)
 		}
 	}
 
+	/* Override global defaults if setting found in general section */
+	ast_copy_flags(&global_flags[0], &setflags[0], mask[0].flags);
+	ast_copy_flags(&global_flags[1], &setflags[1], mask[1].flags);
+	ast_copy_flags(&global_flags[2], &setflags[2], mask[2].flags);
+
 	if (subscribe_network_change) {
 		network_change_event_subscribe();
 	} else {