res_xmpp: Does not connect in component mode

The module res_xmpp does not accept usernames in the form used in component
mode (XEP-0114). In component mode there is no @something in the name.
In component mode the connection is now not dropped anymore.

If the xmpp server sends out a "stream" tag before handshake is finished,
the connection gets dropped in res_xmpp. Now this tag will be ignored and
the connection will be established.

After connecting there will be an exchange of presence states. This does
not work as expected in component mode. The responsible function
"xmpp_pak_presence" is left before the states get sent out. Sending
presence states in component mode is now moved to the top of the function.

ASTERISK-25735 #close

Change-Id: I70e036f931c3124ebb2ad1e56f93ed35cfdd9d5c

res/res_xmpp.c

@@ -3130,6 +3130,10 @@ done:
 /*! \brief Internal function called when we authenticated as a component */
 static int xmpp_component_authenticating(struct ast_xmpp_client *client, struct ast_xmpp_client_config *cfg, int type, iks *node)
 {
+	if (!strcmp(iks_name(node), "stream:features")) {
+		return 0;
+	}
+
 	if (strcmp(iks_name(node), "handshake")) {
 		ast_log(LOG_ERROR, "Failed to authenticate component '%s'\n", client->name);
 		return -1;
@@ -3305,6 +3309,11 @@ static int xmpp_pak_presence(struct ast_xmpp_client *client, struct ast_xmpp_cli
 	int status = pak->show ? pak->show : STATUS_DISAPPEAR;
 	enum ast_device_state state = AST_DEVICE_UNAVAILABLE;
 
+	/* If this is a component presence probe request answer immediately with our presence status */
+	if (ast_test_flag(&cfg->flags, XMPP_COMPONENT) && !ast_strlen_zero(type) && !strcasecmp(type, "probe")) {
+		xmpp_client_set_presence(client, pak->from->full, iks_find_attrib(pak->x, "to"), cfg->status, cfg->statusmsg);
+	}
+
 	/* If no resource is available this is a general buddy presence update, which we will ignore */
 	if (!pak->from->resource) {
 		return 0;
@@ -3319,11 +3328,6 @@ static int xmpp_pak_presence(struct ast_xmpp_client *client, struct ast_xmpp_cli
 		return 0;
 	}
 
-	/* If this is a component presence probe request answer immediately with our presence status */
-	if (ast_test_flag(&cfg->flags, XMPP_COMPONENT) && !ast_strlen_zero(type) && !strcasecmp(type, "probe")) {
-		xmpp_client_set_presence(client, pak->from->full, iks_find_attrib(pak->x, "to"), cfg->status, cfg->statusmsg);
-	}
-
 	ao2_lock(buddy->resources);
 
 	if (!(resource = ao2_callback(buddy->resources, OBJ_NOLOCK, xmpp_resource_cmp, pak->from->resource))) {
@@ -3864,7 +3868,7 @@ static int xmpp_client_config_post_apply(void *obj, void *arg, int flags)
 			cfg->client->jid = iks_id_new(cfg->client->stack, cfg->user);
 		}
 
-		if (!cfg->client->jid || ast_strlen_zero(cfg->client->jid->user)) {
+		if (!cfg->client->jid || (ast_strlen_zero(cfg->client->jid->user) && !ast_test_flag(&cfg->flags, XMPP_COMPONENT))) {
 			ast_log(LOG_ERROR, "Jabber identity '%s' could not be created for client '%s' - client not active\n", cfg->user, cfg->name);
 			return -1;
 		}