int t_append_branches(void) {
struct cell *t = NULL;
struct sip_msg *orig_msg = NULL;
short outgoings;
int success_branch;
str current_uri;
str dst_uri, path, instance, ruid, location_ua;
struct socket_info* si;
int q, i, found;
flag_t backup_bflags = 0;
flag_t bflags = 0;
int new_branch, branch_ret, lowest_ret;
branch_bm_t added_branches;
int replies_locked = 0;
t = get_t();
if(t == NULL)
{
LM_ERR("cannot get transaction\n");
return -1;
}
LM_DBG("transaction %u:%u in status %d\n", t->hash_index, t->label, t->uas.status);
/* test if transaction has already been canceled */
if (t->flags & T_CANCELED) {
ser_error=E_CANCELED;
return -1;
}
if ((t->uas.status >= 200 && t->uas.status<=399)
|| ((t->uas.status >= 600 && t->uas.status)
&& !(t->flags & (T_6xx | T_DISABLE_6xx))) ) {
LM_DBG("transaction %u:%u in status %d: cannot append new branch\n",
t->hash_index, t->label, t->uas.status);
return -1;
}
/* set the lock on the transaction here */
LOCK_REPLIES(t);
replies_locked = 1;
outgoings = t->nr_of_outgoings;
orig_msg = t->uas.request;
LM_DBG("Call %.*s: %d (%d) outgoing branches\n",orig_msg->callid->body.len,
orig_msg->callid->body.s,outgoings, nr_branches);
lowest_ret=E_UNSPEC;
added_branches=0;
/* it's a "late" branch so the on_branch variable has already been
reset by previous execution of t_forward_nonack: we use the saved
value */
if (t->on_branch_delayed) {
/* tell add_uac that it should run branch route actions */
set_branch_route(t->on_branch_delayed);
}
outgoings = t->nr_of_outgoings;
/* not really sure that the following is needed */
set_branch_iterator(nr_branches-1);
found = 0;
while((current_uri.s=next_branch( ¤t_uri.len, &q, &dst_uri, &path,
&bflags, &si, &ruid, &instance, &location_ua))) {
LM_DBG("Current uri %.*s\n",current_uri.len, current_uri.s);
for (i=0; i<nr_branches; i++) {
if (t->uac[i].ruid.len == ruid.len
&& !memcmp(t->uac[i].ruid.s, ruid.s, ruid.len)) {
LM_DBG("branch already added [%.*s]\n", ruid.len, ruid.s);
found = 1;
break;
}
}
if (found)
continue;
setbflagsval(0, bflags);
new_branch=add_uac( t, orig_msg, ¤t_uri,
(dst_uri.len) ? (&dst_uri) : ¤t_uri,
&path, 0, si, orig_msg->fwd_send_flags,
orig_msg->rcv.proto, (dst_uri.len)?-1:UAC_SKIP_BR_DST_F, &instance,
&ruid, &location_ua);
/* test if cancel was received meanwhile */
if (t->flags & T_CANCELED) goto canceled;
if (new_branch>=0)
added_branches |= 1<<new_branch;
else
lowest_ret=MIN_int(lowest_ret, new_branch);
}
clear_branches();
LM_DBG("Call %.*s: %d (%d) outgoing branches after clear_branches()\n",
orig_msg->callid->body.len, orig_msg->callid->body.s,outgoings, nr_branches);
setbflagsval(0, backup_bflags);
/* update message flags, if changed in branch route */
t->uas.request->flags = orig_msg->flags;
if (added_branches==0) {
if(lowest_ret!=E_CFG)
LOG(L_ERR, "ERROR: t_append_branch: failure to add branches\n");
ser_error=lowest_ret;
replies_locked = 0;
UNLOCK_REPLIES(t);
return lowest_ret;
}
ser_error=0; /* clear branch adding errors */
/* send them out now */
success_branch=0;
/* since t_append_branch can only be called from REQUEST_ROUTE, always lock replies */
for (i=outgoings; i<t->nr_of_outgoings; i++) {
if (added_branches & (1<<i)) {
branch_ret=t_send_branch(t, i, orig_msg , 0, 0 /* replies are already locked */ );
if (branch_ret>=0){ /* some kind of success */
if (branch_ret==i) { /* success */
success_branch++;
if (unlikely(has_tran_tmcbs(t, TMCB_REQUEST_OUT)))
run_trans_callbacks_with_buf( TMCB_REQUEST_OUT,
&t->uac[nr_branches].request,
orig_msg, 0, -orig_msg->REQ_METHOD);
}
else /* new branch added */
added_branches |= 1<<branch_ret;
}
}
}
if (success_branch<=0) {
/* return always E_SEND for now
* (the real reason could be: denied by onsend routes, blacklisted,
* send failed or any of the errors listed before + dns failed
* when attempting dns failover) */
ser_error=E_SEND;
/* else return the last error (?) */
/* the caller should take care and delete the transaction */
replies_locked = 0;
UNLOCK_REPLIES(t);
return -1;
}
ser_error=0; /* clear branch send errors, we have overall success */
set_kr(REQ_FWDED);
replies_locked = 0;
UNLOCK_REPLIES(t);
return 1;
canceled:
DBG("t_append_branches: cannot append branches to a canceled transaction\n");
/* reset processed branches */
clear_branches();
/* restore backup flags from initial env */
setbflagsval(0, backup_bflags);
/* update message flags, if changed in branch route */
t->uas.request->flags = orig_msg->flags;
/* if needed unlock transaction's replies */
if (likely(replies_locked)) {
/* restore the number of outgoing branches
* since new branches have not been completed */
t->nr_of_outgoings = outgoings;
replies_locked = 0;
UNLOCK_REPLIES(t);
}
ser_error=E_CANCELED;
return -1;
}
inline static void final_response_handler(
struct retr_buf *r_buf, struct cell *t)
{
int silent;
#ifdef USE_DNS_FAILOVER
/*int i;
int added_branches;
*/
int branch_ret;
int prev_branch;
ticks_t now;
#endif
#ifdef EXTRA_DEBUG
if(t->flags & T_IN_AGONY) {
LM_ERR("transaction %p scheduled for deletion and"
" called from FR timer (flags %x)\n",
t, t->flags);
abort();
}
#endif
/* FR for local cancels.... */
if(r_buf->rbtype == TYPE_LOCAL_CANCEL) {
#ifdef TIMER_DEBUG
LM_DBG("stop retr for local cancel\n");
#endif
return;
}
/* FR for replies (negative INVITE replies) */
if(r_buf->rbtype > 0) {
#ifdef EXTRA_DEBUG
if(t->uas.request->REQ_METHOD != METHOD_INVITE || t->uas.status < 200) {
LM_CRIT("BUG - unknown type reply buffer\n");
abort();
}
#endif
put_on_wait(t);
return;
};
/* lock reply processing to determine how to proceed reliably */
LOCK_REPLIES(t);
/* now it can be only a request retransmission buffer;
try if you can simply discard the local transaction
state without compellingly removing it from the
world */
silent =
/* don't go silent if disallowed globally ... */
cfg_get(tm, tm_cfg, noisy_ctimer) == 0
/* ... or for this particular transaction */
&& has_noisy_ctimer(t) == 0
/* not for UACs */
&& !is_local(t)
/* invites only */
&& is_invite(t)
/* parallel forking does not allow silent state discarding */
&& t->nr_of_outgoings == 1
/* on_negativ reply handler not installed -- serial forking
* could occur otherwise */
&& t->on_failure == 0
/* the same for FAILURE callbacks */
&& !has_tran_tmcbs(t, TMCB_ON_FAILURE_RO | TMCB_ON_FAILURE)
/* something received -- we will not be silent on error */
&& t->uac[r_buf->branch].last_received == 0;
if(silent) {
UNLOCK_REPLIES(t);
#ifdef EXTRA_DEBUG
LM_DBG("transaction silently dropped (%p), branch %d, last_received %d\n",
t, r_buf->branch, t->uac[r_buf->branch].last_received);
#endif
put_on_wait(t);
return;
}
#ifdef EXTRA_DEBUG
LM_DBG("stop retr. and send CANCEL (%p)\n", t);
#endif
if((r_buf->branch < sr_dst_max_branches)
&& /* r_buf->branch is always >=0 */
(t->uac[r_buf->branch].last_received == 0)
&& (t->uac[r_buf->branch].request.buffer
!= NULL) /* not a blind UAC */
) {
/* no reply received */
#ifdef USE_DST_BLACKLIST
if(r_buf->my_T && r_buf->my_T->uas.request
&& (r_buf->my_T->uas.request->REQ_METHOD
& cfg_get(tm, tm_cfg, tm_blst_methods_add)))
dst_blacklist_add(
BLST_ERR_TIMEOUT, &r_buf->dst, r_buf->my_T->uas.request);
#endif
#ifdef USE_DNS_FAILOVER
/* if this is an invite, the destination resolves to more ips, and
* it still hasn't passed more than fr_inv_timeout since we
* started, add another branch/uac */
if(cfg_get(core, core_cfg, use_dns_failover)) {
now = get_ticks_raw();
if((s_ticks_t)(t->end_of_life - now) > 0) {
branch_ret = add_uac_dns_fallback(
t, t->uas.request, &t->uac[r_buf->branch], 0);
prev_branch = -1;
while((branch_ret >= 0) && (branch_ret != prev_branch)) {
prev_branch = branch_ret;
branch_ret =
t_send_branch(t, branch_ret, t->uas.request, 0, 0);
}
}
}
#endif
}
fake_reply(t, r_buf->branch, 408);
}
