Confbridge: Add a user timeout option

This option adds the ability to specify a timeout, in seconds, for a
participant in a ConfBridge. When the user's timeout has been reached,
the user is ejected from the conference with the CONFBRIDGE_RESULT
channel variable set to "TIMEOUT".

The rationale for this change is that there have been times where we
have seen channels get "stuck" in ConfBridge because a network issue
results in a SIP BYE not being received by Asterisk. While these
channels can be hung up manually via CLI/AMI/ARI, adding some sort of
automatic cleanup of the channels is a nice feature to have.

ASTERISK-25549 #close
Reported by Mark Michelson

Change-Id: I2996b6c5e16a3dda27595f8352abad0bda9c2d98

apps/app_confbridge.c

@@ -118,6 +118,7 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 					<value name="KICKED">The channel was kicked from the conference.</value>
 					<value name="ENDMARKED">The channel left the conference as a result of the last marked user leaving.</value>
 					<value name="DTMF">The channel pressed a DTMF sequence to exit the conference.</value>
+					<value name="TIMEOUT">The channel reached its configured timeout.</value>
 				</variable>
 			</variablelist>
 		</description>
@@ -1542,6 +1543,13 @@ static int conf_get_pin(struct ast_channel *chan, struct confbridge_user *user)
 	return -1;
 }
 
+static int user_timeout(struct ast_bridge_channel *bridge_channel, void *ignore)
+{
+	ast_bridge_channel_leave_bridge(bridge_channel, BRIDGE_CHANNEL_STATE_END, 0);
+	pbx_builtin_setvar_helper(bridge_channel->chan, "CONFBRIDGE_RESULT", "TIMEOUT");
+	return -1;
+}
+
 static int conf_rec_name(struct confbridge_user *user, const char *conf_name)
 {
 	char destdir[PATH_MAX];
@@ -1776,6 +1784,16 @@ static int confbridge_exec(struct ast_channel *chan, const char *data)
 		ast_autoservice_stop(chan);
 	}
 
+	if (user.u_profile.timeout) {
+		ast_bridge_interval_hook(&user.features,
+			0,
+			user.u_profile.timeout * 1000,
+			user_timeout,
+			NULL,
+			NULL,
+			AST_BRIDGE_HOOK_REMOVE_ON_PULL);
+	}
+
 	/* See if we need to automatically set this user as a video source or not */
 	handle_video_on_join(conference, user.chan, ast_test_flag(&user.u_profile, USER_OPT_MARKEDUSER));
 

apps/confbridge/conf_config_parser.c

@@ -227,6 +227,9 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 				<configOption name="template">
 					<synopsis>When using the CONFBRIDGE dialplan function, use a user profile as a template for creating a new temporary profile</synopsis>
 				</configOption>
+				<configOption name="timeout">
+					<synopsis>Kick the user out of the conference after this many seconds. 0 means there is no timeout for the user.</synopsis>
+				</configOption>
 			</configObject>
 			<configObject name="bridge_profile">
 				<synopsis>A named profile to apply to specific bridges.</synopsis>
@@ -2109,6 +2112,7 @@ int conf_load_config(void)
 	aco_option_register(&cfg_info, "dsp_silence_threshold", ACO_EXACT, user_types, __stringify(DEFAULT_SILENCE_THRESHOLD), OPT_UINT_T, 0, FLDSET(struct user_profile, silence_threshold));
 	aco_option_register(&cfg_info, "dsp_talking_threshold", ACO_EXACT, user_types, __stringify(DEFAULT_TALKING_THRESHOLD), OPT_UINT_T, 0, FLDSET(struct user_profile, talking_threshold));
 	aco_option_register(&cfg_info, "jitterbuffer", ACO_EXACT, user_types, "no", OPT_BOOLFLAG_T, 1, FLDSET(struct user_profile, flags), USER_OPT_JITTERBUFFER);
+	aco_option_register(&cfg_info, "timeout", ACO_EXACT, user_types, "0", OPT_UINT_T, 0, FLDSET(struct user_profile, timeout));
 	/* This option should only be used with the CONFBRIDGE dialplan function */
 	aco_option_register_custom(&cfg_info, "template", ACO_EXACT, user_types, NULL, user_template_handler, 0);
 

apps/confbridge/include/confbridge.h

@@ -140,6 +140,8 @@ struct user_profile {
 	unsigned int talking_threshold;
 	/*! The time in ms of silence before a user is considered to be silent by the dsp. */
 	unsigned int silence_threshold;
+	/*! The time in ms the user may stay in the confbridge */
+	unsigned int timeout;
 };
 
 enum conf_sounds {