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pbx_dundi.c: Misc memory management fixes when destroying peers

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* In destroy_peer(), fixed memory leaks of lookup history strings and
qualify transactions when destroying peers.

* In destroy_peer(), fixed leaving the registerexpire scheduled callback
active when a peer is destroyed on a reload.  The reload marks and sweeps
peers so any peers not explicitly configured get destroyed.  Peers created
dynamically from the '*' peer will not exist until they re-register after
the reload.  These destroyed peers caused memory corruption when the
registerexpire timer expired.

* Made build_peer() not schedule any callbacks on the '*' peer
(empty_eid).  It is a special peer that is cloned to dynamically created
peers so it doesn't actually get involved in any message transactions.

* Made do_register_expire() remove the dundi/dpeers AstDB entry when a
peer registration expires.

* Fix deep_copy_peer() to not copy some things that cannot be copied to
the cloned peer structure.  Timers, message transactions, and lookup
history are specific to a peer instance.

* Made set_config() lock around processing the mappings configuration.

* Reordered unload_module() to handle load_module() declining the load due
to error.

Change-Id: Ib846b2b60d027f3a2c2b3b563d9a83a357dce1d6
This commit is contained in:
Richard Mudgett
2018-08-15 21:31:45 -05:00
parent 5cd416f354
commit 273e2802aa
1 changed files with 54 additions and 16 deletions
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70
pbx/pbx_dundi.c
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@@ -1318,7 +1318,9 @@ static int do_register_expire(const void *data)
{
struct dundi_peer *peer = (struct dundi_peer *)data;
char eid_str[20];
ast_debug(1, "Register expired for '%s'\n", ast_eid_to_str(eid_str, sizeof(eid_str), &peer->eid));
ast_db_del("dundi/dpeers", dundi_eid_to_str_short(eid_str, sizeof(eid_str), &peer->eid));
peer->registerexpire = -1;
peer->lastms = 0;
memset(&peer->addr, 0, sizeof(peer->addr));
@@ -1540,7 +1542,18 @@ static void deep_copy_peer(struct dundi_peer *peer_dst, const struct dundi_peer
{
struct permission *cur, *perm;
memcpy(peer_dst, peer_src, sizeof(*peer_dst));
*peer_dst = *peer_src;
AST_LIST_NEXT(peer_dst, list) = NULL;
/* Scheduled items cannot go with the copy */
peer_dst->registerid = -1;
peer_dst->qualifyid = -1;
peer_dst->registerexpire = -1;
/* Transactions and lookup history cannot go with the copy either */
peer_dst->regtrans = NULL;
peer_dst->qualtrans = NULL;
memset(&peer_dst->lookups, 0, sizeof(peer_dst->lookups));
memset(&peer_dst->permit, 0, sizeof(peer_dst->permit));
memset(&peer_dst->include, 0, sizeof(peer_dst->permit));
@@ -2367,8 +2380,7 @@ static char *dundi_flush(struct ast_cli_entry *e, int cmd, struct ast_cli_args *
AST_LIST_LOCK(&peers);
AST_LIST_TRAVERSE(&peers, p, list) {
for (x = 0;x < DUNDI_TIMING_HISTORY; x++) {
if (p->lookups[x])
ast_free(p->lookups[x]);
ast_free(p->lookups[x]);
p->lookups[x] = NULL;
p->lookuptimes[x] = 0;
}
@@ -3180,8 +3192,7 @@ static void destroy_trans(struct dundi_transaction *trans, int fromtimeout)
if (!ast_eid_cmp(&trans->them_eid, &peer->eid)) {
peer->avgms = 0;
cnt = 0;
if (peer->lookups[DUNDI_TIMING_HISTORY-1])
ast_free(peer->lookups[DUNDI_TIMING_HISTORY-1]);
ast_free(peer->lookups[DUNDI_TIMING_HISTORY - 1]);
for (x=DUNDI_TIMING_HISTORY-1;x>0;x--) {
peer->lookuptimes[x] = peer->lookuptimes[x-1];
peer->lookups[x] = peer->lookups[x-1];
@@ -4327,19 +4338,31 @@ static void destroy_permissions(struct permissionlist *permlist)
static void destroy_peer(struct dundi_peer *peer)
{
int idx;
AST_SCHED_DEL(sched, peer->registerexpire);
AST_SCHED_DEL(sched, peer->registerid);
if (peer->regtrans)
if (peer->regtrans) {
destroy_trans(peer->regtrans, 0);
}
AST_SCHED_DEL(sched, peer->qualifyid);
if (peer->qualtrans) {
destroy_trans(peer->qualtrans, 0);
}
destroy_permissions(&peer->permit);
destroy_permissions(&peer->include);
/* Release lookup history */
for (idx = 0; idx < ARRAY_LEN(peer->lookups); ++idx) {
ast_free(peer->lookups[idx]);
}
ast_free(peer);
}
static void destroy_map(struct dundi_mapping *map)
{
if (map->weightstr)
ast_free(map->weightstr);
ast_free(map->weightstr);
ast_free(map);
}
@@ -4683,10 +4706,11 @@ static void build_peer(dundi_eid *eid, struct ast_variable *v, int *globalpcmode
ast_log(LOG_WARNING, "Peer '%s' is supposed to have permission for some inbound searches but isn't an inbound peer or outbound precache!\n",
ast_eid_to_str(eid_str, sizeof(eid_str), &peer->eid));
} else {
if (needregister) {
peer->registerid = ast_sched_add(sched, 2000, do_register, peer);
}
if (ast_eid_cmp(&peer->eid, &empty_eid)) {
/* Schedule any items for explicitly configured peers. */
if (needregister) {
peer->registerid = ast_sched_add(sched, 2000, do_register, peer);
}
qualify_peer(peer, 1);
}
}
@@ -4925,13 +4949,17 @@ static int set_config(char *config_file, struct sockaddr_in* sin, int reload)
v = v->next;
}
AST_LIST_UNLOCK(&peers);
mark_mappings();
v = ast_variable_browse(cfg, "mappings");
while(v) {
while (v) {
AST_LIST_LOCK(&peers);
build_mapping(v->name, v->value);
AST_LIST_UNLOCK(&peers);
v = v->next;
}
prune_mappings();
mark_peers();
cat = ast_category_browse(cfg, NULL);
while(cat) {
@@ -4948,6 +4976,7 @@ static int set_config(char *config_file, struct sockaddr_in* sin, int reload)
cat = ast_category_browse(cfg, cat);
}
prune_peers();
ast_config_destroy(cfg);
load_password();
if (globalpcmodel & DUNDI_MODEL_OUTBOUND)
@@ -4980,15 +5009,24 @@ static int unload_module(void)
pthread_join(previous_clearcachethreadid, NULL);
}
close(netsocket);
io_context_destroy(io);
mark_mappings();
prune_mappings();
mark_peers();
prune_peers();
ast_sched_context_destroy(sched);
if (-1 < netsocket) {
close(netsocket);
netsocket = -1;
}
if (io) {
io_context_destroy(io);
io = NULL;
}
if (sched) {
ast_sched_context_destroy(sched);
sched = NULL;
}
return 0;
}