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chan_sip: Start session timer at 200, not at INVITE.

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Asterisk started counting the session timer at INVITE while the other
end correctly started at 200. This meant that for short session-expiries
(90 seconds) combined with long ringing times (e.g. 30 seconds), asterisk
would wrongly assume that the timer was hit before the other end thought
it was time to send a session refresh. This resulted in prematurely
ended calls.

This changes the session timer to start counting first at 200 like RFC
says it should.

(Also removed a few excess NULL checks that would never hit, because if
they did, asterisk would have crashed already.)

ASTERISK-22551 #close
Reported by: i2045 

Review: https://reviewboard.asterisk.org/r/3562/
........

Merged revisions 414620 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 414628 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/12@414636 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Walter Doekes
2014-05-27 21:21:29 +00:00
parent 01332cad9b
commit 4b1e43831c
1 changed files with 14 additions and 22 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
channels/chan_sip.c
View File

@@ -7409,6 +7409,11 @@ static int sip_answer(struct ast_channel *ast)
ast_rtp_instance_update_source(p->rtp);
res = transmit_response_with_sdp(p, "200 OK", &p->initreq, XMIT_CRITICAL, oldsdp, TRUE);
ast_set_flag(&p->flags[1], SIP_PAGE2_DIALOG_ESTABLISHED);
/* RFC says the session timer starts counting on 200,
* not on INVITE. */
if (p->stimer->st_active == TRUE) {
start_session_timer(p);
}
}
sip_pvt_unlock(p);
return res;
@@ -25929,12 +25934,8 @@ static int handle_request_invite(struct sip_pvt *p, struct sip_request *req, str
/* Check if OLI/ANI-II is present in From: */
parse_oli(req, p->owner);
if (p->stimer->st_active == TRUE) {
if (reinvite == 0) {
start_session_timer(p);
} else {
restart_session_timer(p);
}
if (reinvite && p->stimer->st_active == TRUE) {
restart_session_timer(p);
}
if (!req->ignore && p)
@@ -26782,7 +26783,9 @@ static int handle_request_bye(struct sip_pvt *p, struct sip_request *req)
}
stop_media_flows(p); /* Immediately stop RTP, VRTP and UDPTL as applicable */
stop_session_timer(p); /* Stop Session-Timer */
if (p->stimer) {
stop_session_timer(p); /* Stop Session-Timer */
}
if (!ast_strlen_zero(sip_get_header(req, "Also"))) {
ast_log(LOG_NOTICE, "Client '%s' using deprecated BYE/Also transfer method. Ask vendor to support REFER instead\n",
@@ -29143,11 +29146,6 @@ static void acl_change_stasis_cb(void *data, struct stasis_subscription *sub,
/*! \brief Session-Timers: Restart session timer */
static void restart_session_timer(struct sip_pvt *p)
{
if (!p->stimer) {
ast_log(LOG_WARNING, "Null stimer in restart_session_timer - %s\n", p->callid);
return;
}
if (p->stimer->st_active == TRUE) {
ast_debug(2, "Session timer stopped: %d - %s\n", p->stimer->st_schedid, p->callid);
AST_SCHED_DEL_UNREF(sched, p->stimer->st_schedid,
@@ -29160,11 +29158,6 @@ static void restart_session_timer(struct sip_pvt *p)
/*! \brief Session-Timers: Stop session timer */
static void stop_session_timer(struct sip_pvt *p)
{
if (!p->stimer) {
ast_log(LOG_WARNING, "Null stimer in stop_session_timer - %s\n", p->callid);
return;
}
if (p->stimer->st_active == TRUE) {
p->stimer->st_active = FALSE;
ast_debug(2, "Session timer stopped: %d - %s\n", p->stimer->st_schedid, p->callid);
@@ -29179,11 +29172,6 @@ static void start_session_timer(struct sip_pvt *p)
{
unsigned int timeout_ms;
if (!p->stimer) {
ast_log(LOG_WARNING, "Null stimer in start_session_timer - %s\n", p->callid);
return;
}
if (p->stimer->st_schedid > -1) {
/* in the event a timer is already going, stop it */
ast_debug(2, "Session timer stopped: %d - %s\n", p->stimer->st_schedid, p->callid);
@@ -29274,7 +29262,11 @@ return_unref:
/* An error occurred. Stop session timer processing */
if (p->stimer) {
ast_debug(2, "Session timer stopped: %d - %s\n", p->stimer->st_schedid, p->callid);
/* Don't pass go, don't collect $200.. we are the scheduled
* callback. We can rip ourself out here. */
p->stimer->st_schedid = -1;
/* Calling stop_session_timer is nice for consistent debug
* logs. */
stop_session_timer(p);
}