inline static int w_t_cancel_branch(struct sip_msg *msg, char *sflags)
{
branch_bm_t cancel_bitmap = 0;
struct cell *t;
unsigned int flags = (unsigned long)sflags;
t=get_t();
if (t==NULL || t==T_UNDEFINED) {
/* no transaction */
LM_ERR("cannot cancel a reply with no transaction");
return -1;
}
if (!is_invite(t))
return -1;
if (flags&TM_CANCEL_BRANCH_ALL) {
/* lock and get the branches to cancel */
if (!onreply_avp_mode) {
LOCK_REPLIES(t);
which_cancel( t, &cancel_bitmap );
UNLOCK_REPLIES(t);
} else {
which_cancel( t, &cancel_bitmap );
}
if (msg->first_line.u.reply.statuscode>=200)
/* do not cancel the current branch as we got
* a final response here */
cancel_bitmap &= ~(1<<_tm_branch_index);
} else if (flags&TM_CANCEL_BRANCH_OTHERS) {
/* lock and get the branches to cancel */
if (!onreply_avp_mode) {
LOCK_REPLIES(t);
which_cancel( t, &cancel_bitmap );
UNLOCK_REPLIES(t);
} else {
which_cancel( t, &cancel_bitmap );
}
/* ignore current branch */
cancel_bitmap &= ~(1<<_tm_branch_index);
} else {
/* cancel only local branch (only if still ongoing) */
if (msg->first_line.u.reply.statuscode<200)
cancel_bitmap = 1<<_tm_branch_index;
}
/* send cancels out */
cancel_uacs(t, cancel_bitmap);
return 1;
}
void cancel_invite(struct sip_msg *cancel_msg,
struct cell *t_cancel, struct cell *t_invite )
{
#define CANCEL_REASON_SIP_487 \
"Reason: SIP;cause=487;text=\"ORIGINATOR_CANCEL\"" CRLF
branch_bm_t cancel_bitmap;
branch_bm_t dummy_bm;
str reason;
unsigned int i;
struct hdr_field *hdr;
cancel_bitmap=0;
/* send back 200 OK as per RFC3261 */
reason.s = CANCELING;
reason.len = sizeof(CANCELING)-1;
t_reply( t_cancel, cancel_msg, 200, &reason );
reason.s = NULL;
reason.len = 0;
/* propagate the REASON flag ? */
if ( t_cancel->flags&T_CANCEL_REASON_FLAG ) {
/* look for the Reason header */
if (parse_headers(cancel_msg, HDR_EOH_F, 0)<0) {
LM_ERR("failed to parse all hdrs - ignoring Reason hdr\n");
} else {
hdr = get_header_by_static_name(cancel_msg, "Reason");
if (hdr!=NULL) {
reason.s = hdr->name.s;
reason.len = hdr->len;
}
}
}
/* if no reason, use NORMAL CLEARING */
if (reason.s == NULL) {
reason.s = CANCEL_REASON_SIP_487;
reason.len = sizeof(CANCEL_REASON_SIP_487) - 1;
}
/* generate local cancels for all branches */
which_cancel(t_invite, &cancel_bitmap );
set_cancel_extra_hdrs( reason.s, reason.len);
cancel_uacs(t_invite, cancel_bitmap );
set_cancel_extra_hdrs( NULL, 0);
/* internally cancel branches with no received reply */
for (i=t_invite->first_branch; i<t_invite->nr_of_outgoings; i++) {
if (t_invite->uac[i].last_received==0){
/* reset the "request" timers */
reset_timer(&t_invite->uac[i].request.retr_timer);
reset_timer(&t_invite->uac[i].request.fr_timer);
LOCK_REPLIES( t_invite );
relay_reply(t_invite,FAKED_REPLY,i,487,&dummy_bm);
}
}
}
void cancel_invite(struct sip_msg *cancel_msg,
struct cell *t_cancel, struct cell *t_invite, int locked)
{
branch_bm_t cancel_bitmap;
str reason;
cancel_bitmap=0;
/* send back 200 OK as per RFC3261 */
reason.s = CANCELING;
reason.len = sizeof(CANCELING)-1;
if (locked)
t_reply_unsafe( t_cancel, cancel_msg, 200, &reason );
else
t_reply( t_cancel, cancel_msg, 200, &reason );
get_cancel_reason(cancel_msg, t_cancel->flags, &reason);
/* generate local cancels for all branches */
which_cancel(t_invite, &cancel_bitmap );
set_cancel_extra_hdrs( reason.s, reason.len);
cancel_uacs(t_invite, cancel_bitmap );
set_cancel_extra_hdrs( NULL, 0);
/* Do not do anything about branches with no received reply;
* continue the retransmission hoping to get something back;
* if still not, we will generate the 408 Timeout based on FR
* timer; this helps with better coping with missed/lated provisional
* replies in the context of cancelling the transaction
*/
#if 0
/* internally cancel branches with no received reply */
for (i=t_invite->first_branch; i<t_invite->nr_of_outgoings; i++) {
if (t_invite->uac[i].last_received==0){
/* reset the "request" timers */
reset_timer(&t_invite->uac[i].request.retr_timer);
reset_timer(&t_invite->uac[i].request.fr_timer);
LOCK_REPLIES( t_invite );
relay_reply(t_invite,FAKED_REPLY,i,487,&dummy_bm);
}
}
#endif
}
int t_cancel_trans(struct cell *t, str *extra_hdrs)
{
branch_bm_t cancel_bitmap = 0;
if (t==NULL || t==T_UNDEFINED) {
/* no transaction */
LM_ERR("cannot cancel with no transaction");
return -1;
}
LOCK_REPLIES(t);
which_cancel( t, &cancel_bitmap );
UNLOCK_REPLIES(t);
/* send cancels out */
if (extra_hdrs)
set_cancel_extra_hdrs( extra_hdrs->s, extra_hdrs->len);
cancel_uacs(t, cancel_bitmap);
set_cancel_extra_hdrs( NULL, 0);
return 0;
}
/* This is the neurological point of reply processing -- called
* from within a REPLY_LOCK, t_should_relay_response decides
* how a reply shall be processed and how transaction state is
* affected.
*
* Checks if the new reply (with new_code status) should be sent or not
* based on the current
* transaction status.
* Returns - branch number (0,1,...) which should be relayed
* -1 if nothing to be relayed
*/
static enum rps t_should_relay_response( struct cell *Trans , int new_code,
int branch , int *should_store, int *should_relay,
branch_bm_t *cancel_bitmap, struct sip_msg *reply )
{
int branch_cnt;
int picked_code;
int inv_through;
int do_cancel;
/* note: this code never lets replies to CANCEL go through;
we generate always a local 200 for CANCEL; 200s are
not relayed because it's not an INVITE transaction;
>= 300 are not relayed because 200 was already sent
out
*/
LM_DBG("T_code=%d, new_code=%d\n", Trans->uas.status,new_code);
inv_through=new_code>=200 && new_code<300 && is_invite(Trans);
/* if final response sent out, allow only INVITE 2xx */
if ( Trans->uas.status >= 200 ) {
if (inv_through) {
LM_DBG("200 OK for INVITE after final sent\n");
*should_store=0;
Trans->uac[branch].last_received=new_code;
*should_relay=branch;
return RPS_PUSHED_AFTER_COMPLETION;
}
if ( is_hopbyhop_cancel(Trans) && new_code>=200) {
*should_store=0;
*should_relay=-1;
picked_branch=-1;
return RPS_COMPLETED;
}
/* except the exception above, too late messages will
be discarded */
goto discard;
}
/* if final response received at this branch, allow only INVITE 2xx */
if (Trans->uac[branch].last_received>=200
&& !(inv_through && Trans->uac[branch].last_received<300)) {
#ifdef EXTRA_DEBUG
/* don't report on retransmissions */
if (Trans->uac[branch].last_received==new_code) {
LM_DBG("final reply retransmission\n");
} else
/* if you FR-timed-out, faked a local 408 and 487 came, don't
* report on it either */
if (Trans->uac[branch].last_received==408 && new_code==487) {
LM_DBG("487 reply came for a timed-out branch\n");
} else {
/* this looks however how a very strange status rewrite attempt;
* report on it */
LM_DBG("status rewrite by UAS: stored: %d, received: %d\n",
Trans->uac[branch].last_received, new_code );
}
#endif
goto discard;
}
/* no final response sent yet */
/* negative replies subject to fork picking */
if (new_code >=300 ) {
Trans->uac[branch].last_received=new_code;
/* also append the current reply to the transaction to
* make it available in failure routes - a kind of "fake"
* save of the final reply per branch */
Trans->uac[branch].reply = reply;
if (new_code>=600 && !disable_6xx_block) {
/* this is a winner and close all branches */
which_cancel( Trans, cancel_bitmap );
picked_branch=branch;
/* no more new branches should be added to this transaction */
Trans->flags |= T_NO_NEW_BRANCHES_FLAG;
} else {
/* if all_final return lowest */
picked_branch = t_pick_branch( Trans, &picked_code, &do_cancel);
if (picked_branch==-2) { /* branches open yet */
*should_store=1;
*should_relay=-1;
picked_branch=-1;
Trans->uac[branch].reply = 0;
return RPS_STORE;
}
if (picked_branch==-1) {
LM_CRIT("pick_branch failed (lowest==-1) for code %d\n",new_code);
Trans->uac[branch].reply = 0;
goto discard;
}
if (do_cancel) {
branch_bm_t cb = 0;
which_cancel( Trans, &cb );
cleanup_uac_timers(Trans);
cancel_uacs( Trans, cb);
}
}
/* no more pending branches -- try if that changes after
* a callback; save branch count to be able to determine
* later if new branches were initiated */
branch_cnt=Trans->nr_of_outgoings;
reset_kr();
if ( !(Trans->flags&T_NO_DNS_FAILOVER_FLAG) &&
Trans->uac[picked_branch].proxy!=NULL ) {
/* is is a DNS failover scenario, according to RFC 3263 ? */
if (is_3263_failure(Trans)) {
LM_DBG("trying DNS-based failover\n");
/* do DNS failover -> add new branches */
if (do_dns_failover( Trans )!=0) {
/* skip the failed added branches */
branch_cnt = Trans->nr_of_outgoings;
}
}
}
/* run ON_FAILURE handlers ( route and callbacks) */
if ( branch_cnt==Trans->nr_of_outgoings &&
(has_tran_tmcbs( Trans, TMCB_ON_FAILURE) || Trans->on_negative) ) {
run_failure_handlers( Trans );
}
/* now reset it; after the failure logic, the reply may
* not be stored any more and we don't want to keep into
* transaction some broken reference */
Trans->uac[branch].reply = 0;
/* look if the callback perhaps replied transaction; it also
covers the case in which a transaction is replied localy
on CANCEL -- then it would make no sense to proceed to
new branches bellow
*/
if (Trans->uas.status >= 200) {
*should_store=0;
*should_relay=-1;
/* this might deserve an improvement -- if something
was already replied, it was put on wait and then,
returning RPS_COMPLETED will make t_on_reply
put it on wait again; perhaps splitting put_on_wait
from send_reply or a new RPS_ code would be healthy
*/
picked_branch=-1;
return RPS_COMPLETED;
}
/* look if the callback/failure_route introduced new branches ... */
if (branch_cnt<Trans->nr_of_outgoings && get_kr()==REQ_FWDED) {
/* await then result of new branches */
*should_store=1;
*should_relay=-1;
picked_branch=-1;
return RPS_STORE;
}
/* really no more pending branches -- return selected code */
*should_store=0;
*should_relay=picked_branch;
picked_branch=-1;
return RPS_COMPLETED;
}
/* not >=300 ... it must be 2xx or provisional 1xx */
if (new_code>=100) {
/* 1xx and 2xx except 100 will be relayed */
Trans->uac[branch].last_received=new_code;
*should_store=0;
*should_relay= new_code==100? -1 : branch;
if (new_code>=200 ) {
which_cancel( Trans, cancel_bitmap );
return RPS_COMPLETED;
} else return RPS_PROVISIONAL;
}
discard:
*should_store=0;
*should_relay=-1;
return RPS_DISCARDED;
}
static int _reply_light( struct cell *trans, char* buf, unsigned int len,
unsigned int code, char *to_tag, unsigned int to_tag_len,
int lock, struct bookmark *bm)
{
struct retr_buf *rb;
unsigned int buf_len;
branch_bm_t cancel_bitmap;
str cb_s;
if (!buf)
{
LM_DBG("response building failed\n");
/* determine if there are some branches to be canceled */
if ( is_invite(trans) ) {
if (lock) LOCK_REPLIES( trans );
which_cancel(trans, &cancel_bitmap );
if (lock) UNLOCK_REPLIES( trans );
}
/* and clean-up, including cancellations, if needed */
goto error;
}
cancel_bitmap=0;
if (lock) LOCK_REPLIES( trans );
if ( is_invite(trans) ) which_cancel(trans, &cancel_bitmap );
if (trans->uas.status>=200) {
LM_ERR("failed to generate %d reply when a final %d was sent out\n",
code, trans->uas.status);
goto error2;
}
rb = & trans->uas.response;
rb->activ_type=code;
trans->uas.status = code;
buf_len = rb->buffer.s ? len : len + REPLY_OVERBUFFER_LEN;
rb->buffer.s = (char*)shm_resize( rb->buffer.s, buf_len );
/* puts the reply's buffer to uas.response */
if (! rb->buffer.s ) {
LM_ERR("failed to allocate shmem buffer\n");
goto error3;
}
update_local_tags(trans, bm, rb->buffer.s, buf);
rb->buffer.len = len ;
memcpy( rb->buffer.s , buf , len );
/* needs to be protected too because what timers are set depends
on current transactions status */
/* t_update_timers_after_sending_reply( rb ); */
trans->relaied_reply_branch=-2;
if (lock) UNLOCK_REPLIES( trans );
/* do UAC cleanup procedures in case we generated
a final answer whereas there are pending UACs */
if (code>=200) {
if ( is_local(trans) ) {
LM_DBG("local transaction completed\n");
if ( has_tran_tmcbs(trans, TMCB_LOCAL_COMPLETED) ) {
run_trans_callbacks( TMCB_LOCAL_COMPLETED, trans,
0, FAKED_REPLY, code);
}
} else {
/* run the PRE send callbacks */
if ( has_tran_tmcbs(trans, TMCB_RESPONSE_PRE_OUT) ) {
cb_s.s = buf;
cb_s.len = len;
set_extra_tmcb_params( &cb_s, &rb->dst);
if (lock)
run_trans_callbacks_locked( TMCB_RESPONSE_PRE_OUT, trans,
trans->uas.request, FAKED_REPLY, code);
else
run_trans_callbacks( TMCB_RESPONSE_PRE_OUT, trans,
trans->uas.request, FAKED_REPLY, code);
}
}
if (!is_hopbyhop_cancel(trans)) {
cleanup_uac_timers( trans );
if (is_invite(trans)) cancel_uacs( trans, cancel_bitmap );
/* for auth related replies, we do not do retransmission
(via set_final_timer()), but only wait for a final
reply (put_on_wait() ) - see RFC 3261 (26.3.2.4 DoS Protection) */
if ((code != 401) && (code != 407))
set_final_timer( trans );
else
put_on_wait(trans);
}
}
/* send it out : response.dst.send_sock is valid all the time now,
* as it's taken from original request -bogdan */
if (!trans->uas.response.dst.send_sock) {
LM_CRIT("send_sock is NULL\n");
}
SEND_PR_BUFFER( rb, buf, len );
LM_DBG("reply sent out. buf=%p: %.9s..., "
"shmem=%p: %.9s\n", buf, buf, rb->buffer.s, rb->buffer.s );
/* run the POST send callbacks */
if (code>=200&&!is_local(trans)&&has_tran_tmcbs(trans,TMCB_RESPONSE_OUT)) {
cb_s.s = buf;
cb_s.len = len;
set_extra_tmcb_params( &cb_s, &rb->dst);
if (lock)
run_trans_callbacks_locked( TMCB_RESPONSE_OUT, trans,
trans->uas.request, FAKED_REPLY, code);
else
run_trans_callbacks( TMCB_RESPONSE_OUT, trans,
trans->uas.request, FAKED_REPLY, code);
}
pkg_free( buf ) ;
stats_trans_rpl( code, 1 /*local*/ );
LM_DBG("finished\n");
return 1;
error3:
error2:
if (lock) UNLOCK_REPLIES( trans );
pkg_free ( buf );
error:
/* do UAC cleanup */
cleanup_uac_timers( trans );
if ( is_invite(trans) ) cancel_uacs( trans, cancel_bitmap );
/* we did not succeed -- put the transaction on wait */
put_on_wait(trans);
return -1;
}
/* this is the "UAC" above transaction layer; if a final reply
is received, it triggers a callback; note well -- it assumes
it is entered locked with REPLY_LOCK and it returns unlocked!
*/
enum rps local_reply( struct cell *t, struct sip_msg *p_msg, int branch,
unsigned int msg_status, branch_bm_t *cancel_bitmap)
{
/* how to deal with replies for local transaction */
int local_store, local_winner;
enum rps reply_status;
struct sip_msg *winning_msg;
int winning_code;
int totag_retr;
/* branch_bm_t cancel_bitmap; */
/* keep warning 'var might be used un-inited' silent */
winning_msg=0;
winning_code=0;
totag_retr=0;
*cancel_bitmap=0;
reply_status=t_should_relay_response( t, msg_status, branch,
&local_store, &local_winner, cancel_bitmap, p_msg );
LM_DBG("branch=%d, save=%d, winner=%d\n",
branch, local_store, local_winner );
if (local_store) {
if (!store_reply(t, branch, p_msg))
goto error;
}
if (local_winner>=0) {
winning_msg= branch==local_winner
? p_msg : t->uac[local_winner].reply;
if (winning_msg==FAKED_REPLY) {
winning_code = branch==local_winner
? msg_status : t->uac[local_winner].last_received;
} else {
winning_code=winning_msg->REPLY_STATUS;
}
t->uas.status = winning_code;
stats_trans_rpl( winning_code, (winning_msg==FAKED_REPLY)?1:0 );
if (is_invite(t) && winning_msg!=FAKED_REPLY
&& winning_code>=200 && winning_code <300
&& has_tran_tmcbs(t,
TMCB_RESPONSE_OUT|TMCB_RESPONSE_PRE_OUT) ) {
totag_retr=update_totag_set(t, winning_msg);
}
}
UNLOCK_REPLIES(t);
if ( local_winner >= 0 ) {
if (winning_code < 200) {
if (!totag_retr && has_tran_tmcbs(t,TMCB_LOCAL_RESPONSE_OUT)) {
LM_DBG("Passing provisional reply %d to FIFO application\n",
winning_code);
run_trans_callbacks( TMCB_LOCAL_RESPONSE_OUT, t, 0,
winning_msg, winning_code);
}
} else {
LM_DBG("local transaction completed\n");
if (!totag_retr && has_tran_tmcbs(t,TMCB_LOCAL_COMPLETED) ) {
run_trans_callbacks( TMCB_LOCAL_COMPLETED, t, 0,
winning_msg, winning_code );
}
}
}
return reply_status;
error:
which_cancel(t, cancel_bitmap);
UNLOCK_REPLIES(t);
cleanup_uac_timers(t);
if ( get_cseq(p_msg)->method_id==METHOD_INVITE )
cancel_uacs( t, *cancel_bitmap );
put_on_wait(t);
return RPS_ERROR;
}
int t_inject_branch( struct cell *t, struct sip_msg *msg, int flags)
{
static struct sip_msg faked_req;
branch_bm_t cancel_bm;
str reason = str_init(CANCEL_REASON_200);
int rc;
/* does the transaction state still accept new branches ? */
if (t->uas.status >= 200) {
LM_DBG("cannot add branches to a transaction with %d UAS\n",
t->uas.status);
return -2;
}
if (!fake_req( &faked_req, t->uas.request, &t->uas, NULL, 0)) {
LM_ERR("fake_req failed\n");
return -1;
}
/* do we have the branches to be injected ? */
if (flags&TM_INJECT_SRC_EVENT) {
/* get the branch from Event AVPs, as populated by EVI/EBR */
if (ul_contact_event_to_msg( &faked_req )<0) {
LM_ERR("failed to grab new branch from Event\n");
goto error;
}
} else {
/* use the RURI+dset array as destinations to be injected */
if (msg->first_line.type==SIP_REQUEST) {
/* take the RURI branch from the script msg and move it
* into the faked msg (that will be used by t_fwd function) */
if (dst_to_msg( msg, &faked_req )<0) {
LM_ERR("failed to grab new branch from Event\n");
goto error;
}
} else {
/* current message is a reply, so take the first branch from dset
* and move it into the faked msg (that will be used by t_fwd
* function)*/
if (move_branch_to_ruri( 0, &faked_req)<0) {
LM_ERR("no branch found to be moved as new destination\n");
goto error;
}
/* remove it from set */
remove_branch(0);
}
}
/* do we have to cancel the existing branches before injecting new ones? */
if (flags&TM_INJECT_FLAG_CANCEL) {
which_cancel( t, &cancel_bm );
}
/* generated the new branches, without branch counter reset */
rc = t_forward_nonack( t, &faked_req , NULL, 0, 1/*locked*/ );
/* do we have to cancel the existing branches before injecting new ones? */
if (flags&TM_INJECT_FLAG_CANCEL) {
set_cancel_extra_hdrs( reason.s, reason.len);
cancel_uacs( t, cancel_bm );
set_cancel_extra_hdrs( NULL, 0);
}
/* cleanup the faked request */
free_faked_req( &faked_req, t);
return (rc==1)?1:-3;
error:
/* cleanup the faked request */
free_faked_req( &faked_req, t);
return -1;
}
void e2e_cancel( struct sip_msg *cancel_msg,
struct cell *t_cancel, struct cell *t_invite )
{
branch_bm_t cancel_bm, tmp_bm;
int i;
int lowest_error;
str backup_uri;
int ret;
cancel_bm=0;
lowest_error=0;
backup_uri=cancel_msg->new_uri;
/* determine which branches to cancel ... */
which_cancel( t_invite, &cancel_bm );
t_cancel->nr_of_outgoings=t_invite->nr_of_outgoings;
/* fix label -- it must be same for reply matching */
t_cancel->label=t_invite->label;
/* ... and install CANCEL UACs */
for (i=0; i<t_invite->nr_of_outgoings; i++)
if (cancel_bm & (1<<i)) {
ret=e2e_cancel_branch(cancel_msg, t_cancel, t_invite, i);
if (ret<0) cancel_bm &= ~(1<<i);
if (ret<lowest_error) lowest_error=ret;
}
cancel_msg->new_uri=backup_uri;
/* send them out */
for (i=0; i<t_cancel->nr_of_outgoings; i++) {
if (cancel_bm & (1<<i)) {
/* Provisional reply received on this branch, send CANCEL */
/* No need to stop timers as they have already been stopped by the reply */
if (SEND_BUFFER( &t_cancel->uac[i].request)==-1) {
LOG(L_ERR, "ERROR: e2e_cancel: send failed\n");
}
start_retr( &t_cancel->uac[i].request );
} else {
if (t_invite->uac[i].last_received < 100) {
/* No provisional response received, stop
* retransmission timers
*/
reset_timer(&t_invite->uac[i].request.retr_timer);
reset_timer(&t_invite->uac[i].request.fr_timer);
/* Generate faked reply */
LOCK_REPLIES(t_invite);
if (relay_reply(t_invite, FAKED_REPLY, i, 487, &tmp_bm) == RPS_ERROR) {
lowest_error = -1;
}
}
}
}
/* if error occurred, let it know upstream (final reply
will also move the transaction on wait state
*/
if (lowest_error<0) {
LOG(L_ERR, "ERROR: cancel error\n");
t_reply( t_cancel, cancel_msg, 500, "cancel error");
/* if there are pending branches, let upstream know we
are working on it
*/
} else if (cancel_bm) {
DBG("DEBUG: e2e_cancel: e2e cancel proceeding\n");
t_reply( t_cancel, cancel_msg, 200, CANCELING );
/* if the transaction exists, but there is no more pending
branch, tell upstream we're done
*/
} else {
DBG("DEBUG: e2e_cancel: e2e cancel -- no more pending branches\n");
t_reply( t_cancel, cancel_msg, 200, CANCEL_DONE );
}
#ifdef LOCAL_487
/* local 487s have been deprecated -- it better handles
* race conditions (UAS sending 200); hopefully there are
* no longer UACs who go crazy waiting for the 487 whose
* forwarding is being blocked by other unresponsive branch
*/
/* we could await downstream UAS's 487 replies; however,
if some of the branches does not do that, we could wait
long time and annoy upstream UAC which wants to see
a result of CANCEL quickly
*/
DBG("DEBUG: e2e_cancel: sending 487\n");
/* in case that something in the meantime has been sent upstream
(like if FR hit at the same time), don't try to send */
if (t_invite->uas.status>=200) return;
/* there is still a race-condition -- the FR can hit now; that's
not too bad -- we take care in t_reply's REPLY_LOCK; in
the worst case, both this t_reply and other replier will
try, and the later one will result in error message
"can't reply twice"
*/
t_reply(t_invite, t_invite->uas.request, 487, CANCELED );
#endif
}
void e2e_cancel( struct sip_msg *cancel_msg,
struct cell *t_cancel, struct cell *t_invite )
{
branch_bm_t cancel_bm;
branch_bm_t dummy_bm;
int i;
int lowest_error;
str backup_uri;
int rurib_flags;
int ret;
cancel_bm=0;
lowest_error=0;
/* e2e_cancel_branch() makes no RURI parsing, so no need to
* save the ->parse_uri_ok */
backup_uri = cancel_msg->new_uri;
/* branch flags specific to RURI */
rurib_flags = cancel_msg->flags&(~gflags_mask);
/* determine which branches to cancel ... */
which_cancel( t_invite, &cancel_bm );
t_cancel->nr_of_outgoings=t_invite->nr_of_outgoings;
t_cancel->first_branch=t_invite->first_branch;
/* fix label -- it must be same for reply matching */
t_cancel->label=t_invite->label;
/* ... and install CANCEL UACs */
for (i=t_invite->first_branch; i<t_invite->nr_of_outgoings; i++) {
if (cancel_bm & (1<<i)) {
ret=e2e_cancel_branch(cancel_msg, t_cancel, t_invite, i);
if (ret<0) cancel_bm &= ~(1<<i);
if (ret<lowest_error) lowest_error=ret;
}
}
/* restore new_uri */
cancel_msg->new_uri = backup_uri;
cancel_msg->parsed_uri_ok = 0;
/* set flags */
cancel_msg->flags = (cancel_msg->flags&gflags_mask)|rurib_flags;
t_cancel->uas.request->flags = cancel_msg->flags&gflags_mask;
/* send them out */
for (i=t_cancel->first_branch; i<t_cancel->nr_of_outgoings; i++) {
if (cancel_bm & (1<<i)) {
if (SEND_BUFFER( &t_cancel->uac[i].request)==-1) {
LOG(L_ERR, "ERROR: e2e_cancel: send failed\n");
}
start_retr( &t_cancel->uac[i].request );
}
}
/* internally cancel branches with no received reply */
for (i=t_invite->first_branch; i<t_invite->nr_of_outgoings; i++) {
if (t_invite->uac[i].last_received==0){
/* mark as cancelled */
t_invite->uac[i].flags |= T_UAC_TO_CANCEL_FLAG;
/* reset the "request" timers */
reset_timer(&t_invite->uac[i].request.retr_timer);
reset_timer(&t_invite->uac[i].request.fr_timer);
LOCK_REPLIES( t_invite );
if (RPS_ERROR==relay_reply(t_invite,FAKED_REPLY,i,487,&dummy_bm))
lowest_error = -1; /* force sending 500 error */
}
}
/* do not attmpt to send reply for CANCEL if we already did it once;
* to work arround the race between receiveing reply and generating
* local reply, we better check if we are in failure route (which means that
* the reply to UAC is /to be/ sent) or if was actually sent out */
/* calling here t_relay from within failure route will lead to dead lock
* on the transaction's reply lock -bogdan */
if (route_type==FAILURE_ROUTE || t_cancel->uas.status>=200)
return;
/* if error occurred, let it know upstream (final reply
will also move the transaction on wait state
*/
if (lowest_error<0) {
LOG(L_ERR, "ERROR: cancel error\n");
t_reply( t_cancel, cancel_msg, 500, "cancel error");
/* if there are pending branches, let upstream know we
are working on it
*/
} else if (cancel_bm) {
DBG("DEBUG: e2e_cancel: e2e cancel proceeding\n");
t_reply( t_cancel, cancel_msg, 200, CANCELING );
/* if the transaction exists, but there is no more pending
branch, tell upstream we're done
*/
} else {
DBG("DEBUG: e2e_cancel: e2e cancel -- no more pending branches\n");
t_reply( t_cancel, cancel_msg, 200, CANCEL_DONE );
}
#ifdef LOCAL_487
/* local 487s have been deprecated -- it better handles
* race conditions (UAS sending 200); hopefully there are
* no longer UACs who go crazy waiting for the 487 whose
* forwarding is being blocked by other unresponsive branch
*/
/* we could await downstream UAS's 487 replies; however,
if some of the branches does not do that, we could wait
long time and annoy upstream UAC which wants to see
a result of CANCEL quickly
*/
DBG("DEBUG: e2e_cancel: sending 487\n");
/* in case that something in the meantime has been sent upstream
(like if FR hit at the same time), don't try to send */
if (t_invite->uas.status>=200) return;
/* there is still a race-condition -- the FR can hit now; that's
not too bad -- we take care in t_reply's REPLY_LOCK; in
the worst case, both this t_reply and other replier will
try, and the later one will result in error message
"can't reply twice"
*/
t_reply(t_invite, t_invite->uas.request, 487, CANCELED );
#endif
}
void e2e_cancel( struct sip_msg *cancel_msg,
struct cell *t_cancel, struct cell *t_invite )
{
branch_bm_t cancel_bm;
int i;
int lowest_error;
str backup_uri;
int ret;
cancel_bm=0;
lowest_error=0;
backup_uri=cancel_msg->new_uri;
/* determine which branches to cancel ... */
which_cancel( t_invite, &cancel_bm );
t_cancel->nr_of_outgoings=t_invite->nr_of_outgoings;
/* fix label -- it must be same for reply matching */
t_cancel->label=t_invite->label;
/* ... and install CANCEL UACs */
for (i=0; i<t_invite->nr_of_outgoings; i++)
if (cancel_bm & (1<<i)) {
ret=e2e_cancel_branch(cancel_msg, t_cancel, t_invite, i);
if (ret<0) cancel_bm &= ~(1<<i);
if (ret<lowest_error) lowest_error=ret;
}
cancel_msg->new_uri=backup_uri;
/* send them out */
for (i=0; i<t_cancel->nr_of_outgoings; i++) {
if (cancel_bm & (1<<i)) {
if (SEND_BUFFER( &t_cancel->uac[i].request)==-1) {
LOG(L_ERR, "ERROR: e2e_cancel: send failed\n");
}
start_retr( &t_cancel->uac[i].request );
}
}
/* if error occured, let it know upstream (final reply
will also move the transaction on wait state
*/
if (lowest_error<0) {
LOG(L_ERR, "ERROR: cancel error\n");
t_reply( t_cancel, cancel_msg, 500, "cancel error");
/* if there are pending branches, let upstream know we
are working on it
*/
} else if (cancel_bm) {
DBG("DEBUG: e2e_cancel: e2e cancel proceeding\n");
t_reply( t_cancel, cancel_msg, 200, CANCELLING );
/* if the transaction exists, but there is no more pending
branch, tell usptream we're done
*/
} else {
DBG("DEBUG: e2e_cancel: e2e cancel -- no more pending branches\n");
t_reply( t_cancel, cancel_msg, 200, CANCEL_DONE );
}
/* we could await downstream UAS's 487 replies; however,
if some of the branches does not do that, we could wait
long time and annoy upstream UAC which wants to see
a result of CANCEL quickly
*/
DBG("DEBUG: e2e_cancel: sending 487\n");
/* in case that something in the meantime has been sent upstream
(like if FR hit at the same time), don't try to send */
if (t_invite->uas.status>=200) return;
/* there is still a race-condition -- the FR can hit now; that's
not too bad -- we take care in t_reply's REPLY_LOCK; in
the worst case, both this t_reply and other replier will
try, and the later one will result in error message
"can't reply twice"
*/
t_reply(t_invite, t_invite->uas.request, 487, CANCELLED );
}
