[Asterisk-code-review] res pjsip: Move URI validation to use time. (asterisk[13])
Joshua Colp
asteriskteam at digium.com
Wed Oct 21 12:35:51 CDT 2015
Joshua Colp has uploaded a new change for review.
https://gerrit.asterisk.org/1469
Change subject: res_pjsip: Move URI validation to use time.
......................................................................
res_pjsip: Move URI validation to use time.
In a realtime based system with a limited number of threadpool threads
it is possible for a deadlock to occur. This happens when permanent
endpoint state is updated, which will cause database queries to be done.
These queries may result in URI validation being done which is done
synchronously using a PJSIP thread. If all PJSIP threads are in use
processing traffic they themselves may be blocked waiting to get the
permanent endpoint container lock when identifying an endpoint.
This change moves URI validation to occur at use time instead of
configuration time. While this comes at a cost of not seeing a problem
until you use it it does solve the underlying deadlock problem.
ASTERISK-25486 #close
Change-Id: I2d7d167af987d23b3e8199e4a68f3359eba4c76a
---
M include/asterisk/res_pjsip.h
M res/res_pjsip.c
M res/res_pjsip/location.c
M res/res_pjsip/pjsip_configuration.c
4 files changed, 22 insertions(+), 63 deletions(-)
git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/69/1469/1
diff --git a/include/asterisk/res_pjsip.h b/include/asterisk/res_pjsip.h
index a36935d..4590829 100644
--- a/include/asterisk/res_pjsip.h
+++ b/include/asterisk/res_pjsip.h
@@ -1190,6 +1190,11 @@
* cause a deadlock. If you are in a SIP servant thread, just call your function
* in-line.
*
+ * \warning \b Never hold locks that may be acquired by a SIP servant thread when
+ * calling this function. Doing so may cause a deadlock if all SIP servant threads
+ * are blocked waiting to acquire the lock while the thread holding the lock is
+ * waiting for a free SIP servant thread.
+ *
* \param serializer The SIP serializer to which the task belongs. May be NULL.
* \param sip_task The task to execute
* \param task_data The parameter to pass to the task when it executes
diff --git a/res/res_pjsip.c b/res/res_pjsip.c
index 9e5e404..d2b393f 100644
--- a/res/res_pjsip.c
+++ b/res/res_pjsip.c
@@ -2563,6 +2563,8 @@
pj_strdup2_with_null(dlg->pool, &tmp, outbound_proxy);
if (!(route = pjsip_parse_hdr(dlg->pool, &ROUTE_HNAME, tmp.ptr, tmp.slen, NULL))) {
+ ast_log(LOG_ERROR, "Could not create dialog to endpoint '%s' as outbound proxy URI '%s' is not valid\n",
+ ast_sorcery_object_get_id(endpoint), outbound_proxy);
dlg->sess_count--;
pjsip_dlg_terminate(dlg);
return NULL;
@@ -2756,6 +2758,7 @@
pj_str_t from;
pj_pool_t *pool;
pjsip_tpselector selector = { .type = PJSIP_TPSELECTOR_NONE, };
+ pjsip_uri *sip_uri;
if (ast_strlen_zero(uri)) {
if (!endpoint && (!contact || ast_strlen_zero(contact->uri))) {
@@ -2792,6 +2795,16 @@
return -1;
}
+ sip_uri = pjsip_parse_uri(pool, remote_uri.ptr, remote_uri.slen, 0);
+ if (!sip_uri || (!PJSIP_URI_SCHEME_IS_SIP(sip_uri) && !PJSIP_URI_SCHEME_IS_SIPS(sip_uri))) {
+ ast_log(LOG_ERROR, "Unable to create outbound %.*s request to endpoint %s as URI '%s' is not valid\n",
+ (int) pj_strlen(&method->name), pj_strbuf(&method->name),
+ endpoint ? ast_sorcery_object_get_id(endpoint) : "<none>",
+ pj_strbuf(&remote_uri));
+ pjsip_endpt_release_pool(ast_sip_get_pjsip_endpoint(), pool);
+ return -1;
+ }
+
if (sip_dialog_create_from(pool, &from, endpoint ? endpoint->fromuser : NULL,
endpoint ? endpoint->fromdomain : NULL, &remote_uri, &selector)) {
ast_log(LOG_ERROR, "Unable to create From header for %.*s request to endpoint %s\n",
@@ -2816,8 +2829,9 @@
/* If an outbound proxy is specified on the endpoint apply it to this request */
if (endpoint && !ast_strlen_zero(endpoint->outbound_proxy) &&
ast_sip_set_outbound_proxy((*tdata), endpoint->outbound_proxy)) {
- ast_log(LOG_ERROR, "Unable to apply outbound proxy on request %.*s to endpoint %s\n",
- (int) pj_strlen(&method->name), pj_strbuf(&method->name), ast_sorcery_object_get_id(endpoint));
+ ast_log(LOG_ERROR, "Unable to apply outbound proxy on request %.*s to endpoint %s as outbound proxy URI '%s' is not valid\n",
+ (int) pj_strlen(&method->name), pj_strbuf(&method->name), ast_sorcery_object_get_id(endpoint),
+ endpoint->outbound_proxy);
pjsip_endpt_release_pool(ast_sip_get_pjsip_endpoint(), pool);
return -1;
}
diff --git a/res/res_pjsip/location.c b/res/res_pjsip/location.c
index 9625f04..331d839 100644
--- a/res/res_pjsip/location.c
+++ b/res/res_pjsip/location.c
@@ -319,32 +319,6 @@
return (ast_asprintf(buf, "%ld", contact->expiration_time.tv_sec) < 0) ? -1 : 0;
}
-/*! \brief Helper function which validates a permanent contact */
-static int permanent_contact_validate(void *data)
-{
- const char *value = data;
- pj_pool_t *pool;
- pj_str_t contact_uri;
- static const pj_str_t HCONTACT = { "Contact", 7 };
- pjsip_contact_hdr *contact_hdr;
- int rc = 0;
-
- pool = pjsip_endpt_create_pool(ast_sip_get_pjsip_endpoint(), "Permanent Contact Validation", 256, 256);
- if (!pool) {
- return -1;
- }
-
- pj_strdup2_with_null(pool, &contact_uri, value);
- if (!(contact_hdr = pjsip_parse_hdr(pool, &HCONTACT, contact_uri.ptr, contact_uri.slen, NULL))
- || !(PJSIP_URI_SCHEME_IS_SIP(contact_hdr->uri)
- || PJSIP_URI_SCHEME_IS_SIPS(contact_hdr->uri))) {
- rc = -1;
- }
-
- pjsip_endpt_release_pool(ast_sip_get_pjsip_endpoint(), pool);
- return rc;
-}
-
static int permanent_uri_sort_fn(const void *obj_left, const void *obj_right, int flags)
{
const struct ast_sip_contact *object_left = obj_left;
@@ -392,12 +366,6 @@
struct ast_sip_contact *contact;
struct ast_sip_contact_status *status;
char contact_id[strlen(aor_id) + strlen(contact_uri) + 2 + 1];
-
- if (ast_sip_push_task_synchronous(NULL, permanent_contact_validate, contact_uri)) {
- ast_log(LOG_ERROR, "Permanent URI on aor '%s' with contact '%s' failed to parse\n",
- ast_sorcery_object_get_id(aor), contact_uri);
- return -1;
- }
if (!aor->permanent_contacts) {
aor->permanent_contacts = ao2_container_alloc_list(AO2_ALLOC_OPT_LOCK_NOLOCK,
diff --git a/res/res_pjsip/pjsip_configuration.c b/res/res_pjsip/pjsip_configuration.c
index 2fdfc9d..bcbb791 100644
--- a/res/res_pjsip/pjsip_configuration.c
+++ b/res/res_pjsip/pjsip_configuration.c
@@ -1084,29 +1084,6 @@
return persistent->endpoint;
}
-/*! \brief Helper function which validates an outbound proxy */
-static int outbound_proxy_validate(void *data)
-{
- const char *proxy = data;
- pj_pool_t *pool;
- pj_str_t tmp;
- static const pj_str_t ROUTE_HNAME = { "Route", 5 };
-
- pool = pjsip_endpt_create_pool(ast_sip_get_pjsip_endpoint(), "Outbound Proxy Validation", 256, 256);
- if (!pool) {
- return -1;
- }
-
- pj_strdup2_with_null(pool, &tmp, proxy);
- if (!pjsip_parse_hdr(pool, &ROUTE_HNAME, tmp.ptr, tmp.slen, NULL)) {
- pjsip_endpt_release_pool(ast_sip_get_pjsip_endpoint(), pool);
- return -1;
- }
-
- pjsip_endpt_release_pool(ast_sip_get_pjsip_endpoint(), pool);
- return 0;
-}
-
/*! \brief Callback function for when an object is finalized */
static int sip_endpoint_apply_handler(const struct ast_sorcery *sorcery, void *obj)
{
@@ -1116,12 +1093,7 @@
return -1;
}
- if (!ast_strlen_zero(endpoint->outbound_proxy) &&
- ast_sip_push_task_synchronous(NULL, outbound_proxy_validate, (char*)endpoint->outbound_proxy)) {
- ast_log(LOG_ERROR, "Invalid outbound proxy '%s' specified on endpoint '%s'\n",
- endpoint->outbound_proxy, ast_sorcery_object_get_id(endpoint));
- return -1;
- } else if (endpoint->extensions.timer.min_se < 90) {
+ if (endpoint->extensions.timer.min_se < 90) {
ast_log(LOG_ERROR, "Session timer minimum expires time must be 90 or greater on endpoint '%s'\n",
ast_sorcery_object_get_id(endpoint));
return -1;
--
To view, visit https://gerrit.asterisk.org/1469
To unsubscribe, visit https://gerrit.asterisk.org/settings
Gerrit-MessageType: newchange
Gerrit-Change-Id: I2d7d167af987d23b3e8199e4a68f3359eba4c76a
Gerrit-PatchSet: 1
Gerrit-Project: asterisk
Gerrit-Branch: 13
Gerrit-Owner: Joshua Colp <jcolp at digium.com>
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