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res_stasis.c: Fix locking issues with the app_bridge_moh container. 

* Fix unlinking from the app_bridges_moh container in remove_bridge_moh()
without a lock under normal circumstances.

* Made check ast_bridge_set_after_callback() return value in
bridge_moh_create() to handle failure.

* Fixed SCOPED_AO2LOCK() locking over too much scope in
stasis_app_bridge_moh_channel() and stasis_app_bridge_moh_stop().

* Fixed unusual usage of ao2_unlink_flag() in control_unlink().

* Fixed orphaned bridge from off nominal path in
stasis_app_bridge_create().

* Fixed strange construct in stasis_app_unsubscribe().  From a bad merge?

* Made load_module() cleanup on failure.

Review: https://reviewboard.asterisk.org/r/2962/
........

Merged revisions 402593 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@402595 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Richard Mudgett 2013-11-08 20:37:08 +00:00
parent bf5492abd2
commit 7323809607
1 changed files with 43 additions and 58 deletions
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101
res/res_stasis.c
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@ -403,11 +403,7 @@ static int bridges_moh_sort_fn(const void *obj_left, const void *obj_right, cons
/*! Removes the bridge to music on hold channel link */
static void remove_bridge_moh(char *bridge_id)
{
RAII_VAR(struct stasis_app_bridge_moh_wrapper *, moh_wrapper, ao2_find(app_bridges_moh, bridge_id, OBJ_SEARCH_KEY), ao2_cleanup);
if (moh_wrapper) {
ao2_unlink_flags(app_bridges_moh, moh_wrapper, OBJ_NOLOCK);
}
ao2_find(app_bridges_moh, bridge_id, OBJ_SEARCH_KEY | OBJ_UNLINK | OBJ_NODATA);
ast_free(bridge_id);
}
@ -448,7 +444,8 @@ static void *moh_channel_thread(void *data)
{
struct ast_channel *moh_channel = data;
while (!ast_safe_sleep(moh_channel, 1000));
while (!ast_safe_sleep(moh_channel, 1000)) {
}
ast_moh_stop(moh_channel);
ast_hangup(moh_channel);
@ -477,14 +474,16 @@ static struct ast_channel *bridge_moh_create(struct ast_bridge *bridge)
}
chan = prepare_bridge_moh_channel();
if (!chan) {
return NULL;
}
/* The after bridge callback assumes responsibility of the bridge_id. */
ast_bridge_set_after_callback(chan, moh_after_bridge_cb, moh_after_bridge_cb_failed, bridge_id);
if (ast_bridge_set_after_callback(chan,
moh_after_bridge_cb, moh_after_bridge_cb_failed, bridge_id)) {
ast_hangup(chan);
return NULL;
}
bridge_id = NULL;
if (ast_unreal_channel_push_to_bridge(chan, bridge,
@ -493,7 +492,8 @@ static struct ast_channel *bridge_moh_create(struct ast_bridge *bridge)
return NULL;
}
new_wrapper = ao2_alloc_options(sizeof(*new_wrapper), stasis_app_bridge_moh_wrapper_destructor, AO2_ALLOC_OPT_LOCK_NOLOCK);
new_wrapper = ao2_alloc_options(sizeof(*new_wrapper),
stasis_app_bridge_moh_wrapper_destructor, AO2_ALLOC_OPT_LOCK_NOLOCK);
if (!new_wrapper) {
ast_hangup(chan);
return NULL;
@ -503,11 +503,10 @@ static struct ast_channel *bridge_moh_create(struct ast_bridge *bridge)
ast_hangup(chan);
return NULL;
}
ast_string_field_set(new_wrapper, bridge_id, bridge->uniqueid);
ast_string_field_set(new_wrapper, channel_id, ast_channel_uniqueid(chan));
if (!ao2_link(app_bridges_moh, new_wrapper)) {
if (!ao2_link_flags(app_bridges_moh, new_wrapper, OBJ_NOLOCK)) {
ast_hangup(chan);
return NULL;
}
@ -526,13 +525,13 @@ struct ast_channel *stasis_app_bridge_moh_channel(struct ast_bridge *bridge)
{
RAII_VAR(struct stasis_app_bridge_moh_wrapper *, moh_wrapper, NULL, ao2_cleanup);
SCOPED_AO2LOCK(lock, app_bridges_moh);
{
SCOPED_AO2LOCK(lock, app_bridges_moh);
moh_wrapper = ao2_find(app_bridges_moh, bridge->uniqueid, OBJ_SEARCH_KEY | OBJ_NOLOCK);
if (!moh_wrapper) {
struct ast_channel *bridge_moh_channel = bridge_moh_create(bridge);
return bridge_moh_channel;
moh_wrapper = ao2_find(app_bridges_moh, bridge->uniqueid, OBJ_SEARCH_KEY | OBJ_NOLOCK);
if (!moh_wrapper) {
return bridge_moh_create(bridge);
}
}
return ast_channel_get_by_name(moh_wrapper->channel_id);
@ -543,10 +542,7 @@ int stasis_app_bridge_moh_stop(struct ast_bridge *bridge)
RAII_VAR(struct stasis_app_bridge_moh_wrapper *, moh_wrapper, NULL, ao2_cleanup);
struct ast_channel *chan;
SCOPED_AO2LOCK(lock, app_bridges_moh);
moh_wrapper = ao2_find(app_bridges_moh, bridge->uniqueid, OBJ_SEARCH_KEY | OBJ_NOLOCK);
moh_wrapper = ao2_find(app_bridges_moh, bridge->uniqueid, OBJ_SEARCH_KEY | OBJ_UNLINK);
if (!moh_wrapper) {
return -1;
}
@ -560,8 +556,6 @@ int stasis_app_bridge_moh_stop(struct ast_bridge *bridge)
ast_softhangup(chan, AST_CAUSE_NORMAL_CLEARING);
ao2_cleanup(chan);
ao2_unlink_flags(app_bridges_moh, moh_wrapper, OBJ_NOLOCK);
return 0;
}
@ -582,15 +576,15 @@ static void control_unlink(struct stasis_app_control *control)
return;
}
ao2_unlink_flags(app_controls, control,
OBJ_SEARCH_OBJECT | OBJ_UNLINK | OBJ_NODATA);
ao2_unlink(app_controls, control);
ao2_cleanup(control);
}
struct ast_bridge *stasis_app_bridge_create(const char *type)
{
struct ast_bridge *bridge;
int capabilities, flags = AST_BRIDGE_FLAG_MERGE_INHIBIT_FROM | AST_BRIDGE_FLAG_MERGE_INHIBIT_TO
int capabilities;
int flags = AST_BRIDGE_FLAG_MERGE_INHIBIT_FROM | AST_BRIDGE_FLAG_MERGE_INHIBIT_TO
| AST_BRIDGE_FLAG_SWAP_INHIBIT_FROM | AST_BRIDGE_FLAG_SWAP_INHIBIT_TO
| AST_BRIDGE_FLAG_TRANSFER_PROHIBITED;
@ -607,7 +601,10 @@ struct ast_bridge *stasis_app_bridge_create(const char *type)
bridge = ast_bridge_base_new(capabilities, flags);
if (bridge) {
ao2_link(app_bridges, bridge);
if (!ao2_link(app_bridges, bridge)) {
ast_bridge_destroy(bridge, 0);
bridge = NULL;
}
}
return bridge;
}
@ -1072,12 +1069,12 @@ enum stasis_app_subscribe_res stasis_app_unsubscribe(const char *app_name,
int i;
if (app_name) {
ast_log(LOG_WARNING, "Could not find app '%s'\n",
app_name ? : "(null)");
app = ao2_find(apps_registry, app_name, OBJ_SEARCH_KEY);
}
if (!app) {
ast_log(LOG_WARNING, "Could not find app '%s'\n",
app_name ? : "(null)");
return STASIS_ASR_APP_NOT_FOUND;
}
@ -1139,34 +1136,6 @@ void stasis_app_unref(void)
ast_module_unref(ast_module_info->self);
}
static int load_module(void)
{
apps_registry = ao2_container_alloc(APPS_NUM_BUCKETS, app_hash,
app_compare);
if (apps_registry == NULL) {
return AST_MODULE_LOAD_FAILURE;
}
app_controls = ao2_container_alloc(CONTROLS_NUM_BUCKETS, control_hash,
control_compare);
if (app_controls == NULL) {
return AST_MODULE_LOAD_FAILURE;
}
app_bridges = ao2_container_alloc(BRIDGES_NUM_BUCKETS, bridges_hash,
bridges_compare);
app_bridges_moh = ao2_container_alloc_hash(
AO2_ALLOC_OPT_LOCK_MUTEX, AO2_CONTAINER_ALLOC_OPT_DUPS_REJECT,
37, bridges_moh_hash_fn, bridges_moh_sort_fn, NULL);
if (!app_bridges_moh) {
return AST_MODULE_LOAD_FAILURE;
}
return AST_MODULE_LOAD_SUCCESS;
}
static int unload_module(void)
{
ao2_cleanup(apps_registry);
@ -1184,6 +1153,22 @@ static int unload_module(void)
return 0;
}
static int load_module(void)
{
apps_registry = ao2_container_alloc(APPS_NUM_BUCKETS, app_hash, app_compare);
app_controls = ao2_container_alloc(CONTROLS_NUM_BUCKETS, control_hash, control_compare);
app_bridges = ao2_container_alloc(BRIDGES_NUM_BUCKETS, bridges_hash, bridges_compare);
app_bridges_moh = ao2_container_alloc_hash(
AO2_ALLOC_OPT_LOCK_MUTEX, AO2_CONTAINER_ALLOC_OPT_DUPS_REJECT,
37, bridges_moh_hash_fn, bridges_moh_sort_fn, NULL);
if (!apps_registry || !app_controls || !app_bridges || !app_bridges_moh) {
unload_module();
return AST_MODULE_LOAD_FAILURE;
}
return AST_MODULE_LOAD_SUCCESS;
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS, "Stasis application support",
.load = load_module,
.unload = unload_module,