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This patch fixes an issue with SRTP which makes HOLD/UNHOLD impossible when too

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much time has passed between sending audio.

(closes issue #18206)
Reported by: bernhardsi
Patches: 
      res_srtp_unhold.patch uploaded by bernhards (license 1138)
Tested by: bernhards, notthematrix



git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@318919 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Brett Bryant
2011-05-13 18:04:50 +00:00
parent 6ddb2e9ee0
commit 7f7f233e8f
1 changed files with 46 additions and 0 deletions
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46
res/res_srtp.c
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@@ -314,8 +314,11 @@ static int ast_srtp_unprotect(struct ast_srtp *srtp, void *buf, int *len, int rt
{
int res = 0;
int i;
int retry = 0;
struct ast_rtp_instance_stats stats = {0,};
tryagain:
for (i = 0; i < 2; i++) {
res = rtcp ? srtp_unprotect_rtcp(srtp->session, buf, len) : srtp_unprotect(srtp->session, buf, len);
if (res != err_status_no_ctx) {
@@ -334,6 +337,49 @@ static int ast_srtp_unprotect(struct ast_srtp *srtp, void *buf, int *len, int rt
}
}
if (retry == 0 && res == err_status_replay_old) {
ast_log(LOG_WARNING, "SRTP unprotect: %s\n", srtp_errstr(res));
if (srtp->session) {
struct ast_srtp_policy *policy;
struct ao2_iterator it;
int policies_count = 0;
// dealloc first
ast_log(LOG_WARNING, "SRTP destroy before re-create\n");
srtp_dealloc(srtp->session);
// get the count
policies_count = ao2_container_count(srtp->policies);
// get the first to build up
it = ao2_iterator_init(srtp->policies, 0);
policy = ao2_iterator_next(&it);
ast_log(LOG_WARNING, "SRTP try to re-create\n");
if (srtp_create(&srtp->session, &policy->sp) == err_status_ok) {
ast_log(LOG_WARNING, "SRTP re-created with first policy\n");
// unref first element
ao2_t_ref(policy, -1, "Unreffing first policy for re-creating srtp session");
// if we have more than one policy, add them afterwards
if (policies_count > 1) {
ast_log(LOG_WARNING, "Add all the other %d policies\n", policies_count-1);
while ((policy = ao2_iterator_next(&it))) {
srtp_add_stream(srtp->session, &policy->sp);
ao2_t_ref(policy, -1, "Unreffing n-th policy for re-creating srtp session");
}
}
retry++;
ao2_iterator_destroy(&it);
goto tryagain;
}
ao2_iterator_destroy(&it);
}
}
if (res != err_status_ok && res != err_status_replay_fail ) {
ast_log(LOG_WARNING, "SRTP unprotect: %s\n", srtp_errstr(res));
errno = EAGAIN;