Merged revisions 318919 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.8

........
  r318919 | bbryant | 2011-05-13 14:04:50 -0400 (Fri, 13 May 2011) | 10 lines

  This patch fixes an issue with SRTP which makes HOLD/UNHOLD impossible when too
  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/trunk@318920 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/res/res_srtp.c b/res/res_srtp.c
index f21ac0f..3e9525a 100644 (file)
--- a/res/res_srtp.c
+++ b/res/res_srtp.c
@@ -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;