chan_sip: Fix a bug causing SIP reloads to remove all entries from the registry

A regression was introduced in chan_sip by changes to sip reload introduced by
r349097. That patch moved peer purging from the beginning of the reload to
after the general configuration was finished. This patch fixes that by undoing
the repositioning of the original peer purging code and using a similar
function after performing general configuration that purges only autocreated
peers that were created when persist mode isn't enabled.

(closes issue ASTERISK-20611)
Reported by: Alisher
Review: https://reviewboard.asterisk.org/r/2171/
........

Merged revisions 375575 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@375576 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -30934,7 +30934,16 @@ static struct sip_peer *build_peer(const char *name, struct ast_variable *v, str
 static int peer_markall_func(void *device, void *arg, int flags)
 {
 	struct sip_peer *peer = device;
-	if (!peer->selfdestruct || sip_cfg.autocreatepeer != AUTOPEERS_PERSIST) {
+	if (!peer->selfdestruct) {
+		peer->the_mark = 1;
+	}
+	return 0;
+}
+
+static int peer_markall_autopeers_func(void *device, void *arg, int flags)
+{
+	struct sip_peer *peer = device;
+	if (peer->selfdestruct) {
 		peer->the_mark = 1;
 	}
 	return 0;
@@ -31076,6 +31085,11 @@ static int reload_config(enum channelreloadreason reason)
 		ast_mutex_unlock(&authl_lock);
 
 		cleanup_all_regs();
+
+		/* Then, actually destroy users and registry */
+		ASTOBJ_CONTAINER_DESTROYALL(&regl, sip_registry_destroy);
+		ast_debug(4, "--------------- Done destroying registry list\n");
+		ao2_t_callback(peers, OBJ_NODATA, peer_markall_func, NULL, "callback to mark all peers");
 	}
 
 	/* Reset certificate handling for TLS sessions */
@@ -31802,11 +31816,8 @@ static int reload_config(enum channelreloadreason reason)
 		max_subexpiry = max_expiry;
 	}
 
-	if (reason != CHANNEL_MODULE_LOAD) {
+	if (reason != CHANNEL_MODULE_LOAD && sip_cfg.autocreatepeer != AUTOPEERS_PERSIST) {
-		/* Then, actually destroy users and registry */
+		ao2_t_callback(peers, OBJ_NODATA, peer_markall_autopeers_func, NULL, "callback to mark autopeers for destruction");
-		ASTOBJ_CONTAINER_DESTROYALL(&regl, sip_registry_destroy);
-		ast_debug(4, "--------------- Done destroying registry list\n");
-		ao2_t_callback(peers, OBJ_NODATA, peer_markall_func, NULL, "callback to mark all peers");
 	}
 
 	if (subscribe_network_change) {

configs/sip.conf.sample

@@ -510,14 +510,14 @@ srvlookup=yes                   ; Enable DNS SRV lookups on outbound calls
 ;
 ;refer_addheaders=yes	; on by default
 
-;autocreatepeers=no             ; Allow any not exsplicitly defined here UAC to register
+;autocreatepeer=no             ; Allow any UAC not explicitly defined to register
-                                ; WITHOUT AUTHENTICATION. Enabling this options poses a high
+                               ; WITHOUT AUTHENTICATION. Enabling this options poses a high
-                                ; potential security risk and should be avoided unless the 
+                               ; potential security risk and should be avoided unless the
-                                ; server is behind a trusted firewall. 
+                               ; server is behind a trusted firewall.
-                                ; When enabled by setting to "yes", the autocreated peers are
+                               ; If set to "yes", then peers created in this fashion
-                                ; pruned immediately when the "sip reload" command is issued
+                               ; are purged during SIP reloads.
-                                ; through CLI. When enabled by setting to "persist", the auto-
+                               ; When set to "persist", the peers created in this fashion
-                                ; created peers survive the "sip reload" command.
+                               ; are not purged during SIP reloads.
 
 ;
 ;------------------------ TLS settings ------------------------------------------------------------