/*
* $Id: t_reply.c 2499 2007-07-23 16:08:53Z bogdan_iancu $
*
* Copyright (C) 2001-2003 FhG Fokus
*
* This file is part of openser, a free SIP server.
*
* openser is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version
*
* openser is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* History:
* --------
* 2003-01-19 faked lump list created in on_reply handlers
* 2003-01-27 next baby-step to removing ZT - PRESERVE_ZT (jiri)
* 2003-02-13 updated to use rb->dst (andrei)
* 2003-02-18 replaced TOTAG_LEN w/ TOTAG_VALUE_LEN (TOTAG_LEN was defined
* twice with different values!) (andrei)
* 2003-02-28 scratchpad compatibility abandoned (jiri)
* 2003-03-01 kr set through a function now (jiri)
* 2003-03-06 saving of to-tags for ACK/200 matching introduced,
* voicemail changes accepted, updated to new callback
* names (jiri)
* 2003-03-10 fixed new to tag bug/typo (if w/o {}) (andrei)
* 2003-03-16 removed _TOTAG (jiri)
* 2003-03-31 200 for INVITE/UAS resent even for UDP (jiri)
* 2003-03-31 removed msg->repl_add_rm (andrei)
* 2003-04-05 s/reply_route/failure_route, onreply_route introduced (jiri)
* 2003-04-14 local acks generated before reply processing to avoid
* delays in length reply processing (like opening TCP
* connection to an unavailable destination) (jiri)
* 2003-09-11 updates to new build_res_buf_from_sip_req() interface (bogdan)
* 2003-09-11 t_reply_with_body() reshaped to use reply_lumps +
* build_res_buf_from_sip_req() instead of
* build_res_buf_with_body_from_sip_req() (bogdan)
* 2003-11-05 flag context updated from failure/reply handlers back
* to transaction context (jiri)
* 2003-11-11: build_lump_rpl() removed, add_lump_rpl() has flags (bogdan)
* 2003-12-04 global TM callbacks switched to per transaction callbacks
* (bogdan)
* 2004-02-06: support for user pref. added - destroy_avps (bogdan)
* 2003-11-05 flag context updated from failure/reply handlers back
* to transaction context (jiri)
* 2003-11-11: build_lump_rpl() removed, add_lump_rpl() has flags (bogdan)
* 2004-02-13: t->is_invite and t->local replaced with flags (bogdan)
* 2004-02-18 fifo_t_reply imported from vm module (bogdan)
* 2004-08-23 avp list is available from failure/on_reply routes (bogdan)
* 2004-10-01 added a new param.: restart_fr_on_each_reply (andrei)
* 2005-03-01 force for statefull replies the incoming interface of
* the request (bogdan)
* 2005-03-01 local ACK sent to same address as INVITE ->
* all [build|send]_[local]_ack functions merged into
* send_ack() (bogdan)
* 2007-01-25 DNS failover at transaction level added (bogdan)
*/
#include "../../hash_func.h"
#include "../../dprint.h"
#include "../../config.h"
#include "../../parser/parser_f.h"
#include "../../ut.h"
#include "../../timer.h"
#include "../../error.h"
#include "../../action.h"
#include "../../dset.h"
#include "../../tags.h"
#include "../../data_lump.h"
#include "../../data_lump_rpl.h"
#include "../../usr_avp.h"
#include "../../unixsock_server.h"
#include "h_table.h"
#include "t_hooks.h"
#include "t_funcs.h"
#include "t_reply.h"
#include "t_cancel.h"
#include "t_msgbuilder.h"
#include "t_lookup.h"
#include "t_fwd.h"
#include "fix_lumps.h"
#include "t_stats.h"
#include "uac.h"
/* restart fr timer on each provisional reply, default yes */
int restart_fr_on_each_reply=1;
int onreply_avp_mode = 0;
/* private place where we create to-tags for replies */
char tm_tags[TOTAG_VALUE_LEN];
static str tm_tag = {tm_tags,TOTAG_VALUE_LEN};
char *tm_tag_suffix;
static int picked_branch=-1;
/* where to go if there is no positive reply */
static int goto_on_negative=0;
/* where to go on receipt of reply */
static int goto_on_reply=0;
/* returns the picked branch */
int t_get_picked_branch()
{
return picked_branch;
}
/* we store the reply_route # in private memory which is
then processed during t_relay; we cannot set this value
before t_relay creates transaction context or after
t_relay when a reply may arrive after we set this
value; that's why we do it how we do it, i.e.,
*inside* t_relay using hints stored in private memory
before t_relay is called
*/
void t_on_negative( unsigned int go_to )
{
struct cell *t = get_t();
/* in MODE_REPLY and MODE_ONFAILURE T will be set to current transaction;
* in MODE_REQUEST T will be set only if the transaction was already
* created; if not -> use the static variable */
if (!t || t==T_UNDEFINED )
goto_on_negative=go_to;
else
t->on_negative = go_to;
}
void t_on_reply( unsigned int go_to )
{
struct cell *t = get_t();
/* in MODE_REPLY and MODE_ONFAILURE T will be set to current transaction;
* in MODE_REQUEST T will be set only if the transaction was already
* created; if not -> use the static variable */
if (!t || t==T_UNDEFINED )
goto_on_reply=go_to;
else
t->on_reply = go_to;
}
unsigned int get_on_negative()
{
return goto_on_negative;
}
unsigned int get_on_reply()
{
return goto_on_reply;
}
void tm_init_tags()
{
init_tags(tm_tags, &tm_tag_suffix,
"OpenSER-TM/tags", TM_TAG_SEPARATOR );
}
/* returns 0 if the message was previously acknowledged
* (i.e., no E2EACK callback is needed) and one if the
* callback shall be executed */
int unmatched_totag(struct cell *t, struct sip_msg *ack)
{
struct totag_elem *i;
str *tag;
if (parse_headers(ack, HDR_TO_F,0)==-1 ||
!ack->to ) {
LOG(L_ERR, "ERROR: unmatched_totag: To invalid\n");
return 1;
}
tag=&get_to(ack)->tag_value;
for (i=t->fwded_totags; i; i=i->next) {
if (i->tag.len==tag->len
&& memcmp(i->tag.s, tag->s, tag->len)==0) {
DBG("DEBUG: totag for e2e ACK found: %d\n", i->acked);
/* to-tag recorded, and an ACK has been received for it */
if (i->acked) return 0;
/* to-tag recorded, but this ACK came for the first time */
i->acked=1;
return 1;
}
}
/* surprising: to-tag never sighted before */
return 1;
}
static inline void update_local_tags(struct cell *trans,
struct bookmark *bm, char *dst_buffer,
char *src_buffer /* to which bm refers */)
{
if (bm->to_tag_val.s) {
trans->uas.local_totag.s=bm->to_tag_val.s-src_buffer+dst_buffer;
trans->uas.local_totag.len=bm->to_tag_val.len;
}
}
/* append a newly received tag from a 200/INVITE to
* transaction's set; (only safe if called from within
* a REPLY_LOCK); it returns 1 if such a to tag already
* exists
*/
inline static int update_totag_set(struct cell *t, struct sip_msg *ok)
{
struct totag_elem *i, *n;
str *tag;
char *s;
if (!ok->to || !ok->to->parsed) {
LOG(L_ERR, "ERROR: update_totag_set: to not parsed\n");
return 0;
}
tag=&get_to(ok)->tag_value;
if (!tag->s) {
DBG("ERROR: update_totag_set: no tag in to\n");
return 0;
}
for (i=t->fwded_totags; i; i=i->next) {
if (i->tag.len==tag->len
&& memcmp(i->tag.s, tag->s, tag->len) ==0 ){
/* to tag already recorded */
#ifdef XL_DEBUG
LOG(L_CRIT, "DEBUG: update_totag_set: totag retransmission\n");
#else
DBG("DEBUG: update_totag_set: totag retransmission\n");
#endif
return 1;
}
}
/* that's a new to-tag -- record it */
shm_lock();
n=(struct totag_elem*) shm_malloc_unsafe(sizeof(struct totag_elem));
s=(char *)shm_malloc_unsafe(tag->len);
shm_unlock();
if (!s || !n) {
LOG(L_ERR, "ERROR: update_totag_set: no memory \n");
if (n) shm_free(n);
if (s) shm_free(s);
return 0;
}
memset(n, 0, sizeof(struct totag_elem));
memcpy(s, tag->s, tag->len );
n->tag.s=s;n->tag.len=tag->len;
n->next=t->fwded_totags;
t->fwded_totags=n;
DBG("DEBUG: update_totag_set: new totag \n");
return 0;
}
/*
* Build and send an ACK to a negative reply
*/
static int send_ack(struct sip_msg* rpl, struct cell *trans, int branch)
{
str to;
char *ack_p;
unsigned int ack_len;
if (parse_headers( rpl, is_local(trans)?HDR_EOH_F:HDR_TO_F, 0)==-1
|| !rpl->to ) {
LOG(L_ERR, "ERROR:tm:send_ack: "
"cannot generate a HBH ACK if key HFs in reply missing\n");
goto error;
}
to.s=rpl->to->name.s;
to.len=rpl->to->len;
ack_p = is_local(trans)?
build_dlg_ack(rpl, trans, branch, &to, &ack_len):
build_local( trans, branch, &ack_len, ACK, ACK_LEN, &to );
if (ack_p==0) {
LOG(L_ERR, "ERROR:tm:send_ack: failed to build ACK\n");
goto error;
}
SEND_PR_BUFFER(&trans->uac[branch].request, ack_p, ack_len);
shm_free(ack_p);
return 0;
error:
return -1;
}
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)
{
DBG("DEBUG:tm:_reply_light: 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) {
LOG( L_ERR, "ERROR:tm: _reply_light: can't 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 ) {
LOG(L_ERR,"ERROR:tm:_reply_light: cannot 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) ) {
DBG("DEBUG:tm:_reply_light: local transaction completed\n");
if ( has_tran_tmcbs(trans, TMCB_LOCAL_COMPLETED) ) {
run_trans_callbacks( TMCB_LOCAL_COMPLETED, trans,
0, FAKED_REPLY, code);
}
} else {
if ( has_tran_tmcbs(trans, TMCB_RESPONSE_OUT) ) {
cb_s.s = buf;
cb_s.len = len;
set_extra_tmcb_params( &cb_s, &rb->dst);
run_trans_callbacks( TMCB_RESPONSE_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 );
set_final_timer( 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) {
LOG(L_CRIT,"BUG:tm:_reply_light: send_sock is NULL\n");
}
SEND_PR_BUFFER( rb, buf, len );
DBG("DEBUG:tm:_reply_light: reply sent out. buf=%p: %.9s..., "
"shmem=%p: %.9s\n", buf, buf, rb->buffer.s, rb->buffer.s );
pkg_free( buf ) ;
stats_trans_rpl( code, 1 /*local*/ );
DBG("DEBUG:tm:_reply_light: 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;
}
/* send a UAS reply
* returns 1 if everything was OK or -1 for error
*/
static int _reply( struct cell *trans, struct sip_msg* p_msg,
unsigned int code, str *text, int lock )
{
unsigned int len;
char * buf, *dset;
struct bookmark bm;
int dset_len;
if (code>=200) set_kr(REQ_RPLD);
/* compute the buffer in private memory prior to entering lock;
* create to-tag if needed */
/* if that is a redirection message, dump current message set to it */
if (code>=300 && code<400) {
dset=print_dset(p_msg, &dset_len);
if (dset) {
add_lump_rpl(p_msg, dset, dset_len, LUMP_RPL_HDR);
}
}
if (code>=180 && p_msg->to
&& (get_to(p_msg)->tag_value.s==0
|| get_to(p_msg)->tag_value.len==0)) {
calc_crc_suffix( p_msg, tm_tag_suffix );
buf = build_res_buf_from_sip_req(code,text, &tm_tag, p_msg, &len, &bm);
return _reply_light( trans, buf, len, code,
tm_tag.s, TOTAG_VALUE_LEN, lock, &bm);
} else {
buf = build_res_buf_from_sip_req(code,text, 0 /*no to-tag*/,
p_msg, &len, &bm);
return _reply_light(trans,buf,len,code, 0, 0 /* no to-tag */,
lock, &bm);
}
}
/*if msg is set -> it will fake the env. vars conforming with the msg; if NULL
* the env. will be restore to original */
static inline void faked_env( struct cell *t,struct sip_msg *msg)
{
static struct cell *backup_t;
static struct usr_avp **backup_list;
static struct socket_info* backup_si;
static int backup_route_type;
if (msg) {
swap_route_type( backup_route_type, FAILURE_ROUTE);
/* tm actions look in beginning whether transaction is
* set -- whether we are called from a reply-processing
* or a timer process, we need to set current transaction;
* otherwise the actions would attempt to look the transaction
* up (unnecessary overhead, refcounting)
*/
/* backup */
backup_t = get_t();
/* fake transaction */
set_t(t);
/* make available the avp list from transaction */
backup_list = set_avp_list( &t->user_avps );
/* set default send address to the saved value */
backup_si = bind_address;
bind_address = t->uac[0].request.dst.send_sock;
} else {
/* restore original environment */
set_t(backup_t);
set_route_type( backup_route_type );
/* restore original avp list */
set_avp_list( backup_list );
bind_address = backup_si;
}
}
static inline int fake_req(struct sip_msg *faked_req, struct sip_msg *shm_msg,
struct ua_server *uas, struct ua_client *uac)
{
/* on_negative_reply faked msg now copied from shmem msg (as opposed
* to zero-ing) -- more "read-only" actions (exec in particular) will
* work from reply_route as they will see msg->from, etc.; caution,
* rw actions may append some pkg stuff to msg, which will possibly be
* never released (shmem is released in a single block) */
memcpy( faked_req, shm_msg, sizeof(struct sip_msg));
/* if we set msg_id to something different from current's message
* id, the first t_fork will properly clean new branch URIs */
faked_req->id=shm_msg->id-1;
/* msg->parsed_uri_ok must be reset since msg_parsed_uri is
* not cloned (and cannot be cloned) */
faked_req->parsed_uri_ok = 0;
/* new_uri can change -- make a private copy */
faked_req->new_uri.s=pkg_malloc( uac->uri.len+1 );
if (!faked_req->new_uri.s) {
LOG(L_ERR, "ERROR:tm:fake_req: no uri/pkg mem\n");
goto error;
}
faked_req->new_uri.len = uac->uri.len;
memcpy( faked_req->new_uri.s, uac->uri.s, uac->uri.len);
faked_req->new_uri.s[faked_req->new_uri.len]=0;
faked_req->parsed_uri_ok = 0;
/* dst_set is imposible to restore (since it's not saved),
* so let it set to NULL */
/* set as flags the global flags and the branch flags from the
* elected branch */
faked_req->flags = uas->request->flags;
setb0flags( uac->br_flags);
return 1;
error:
return 0;
}
inline static void free_faked_req(struct sip_msg *faked_req, struct cell *t)
{
struct hdr_field *hdr;
if (faked_req->new_uri.s) {
pkg_free(faked_req->new_uri.s);
faked_req->new_uri.s = 0;
}
/* free all types of lump that were added in failure handlers */
del_notflaged_lumps( &(faked_req->add_rm), LUMPFLAG_SHMEM );
del_notflaged_lumps( &(faked_req->body_lumps), LUMPFLAG_SHMEM );
del_nonshm_lump_rpl( &(faked_req->reply_lump) );
/* free header's parsed structures that were added by failure handlers */
for( hdr=faked_req->headers ; hdr ; hdr=hdr->next ) {
if ( hdr->parsed && hdr_allocs_parse(hdr) &&
(hdr->parsed<(void*)t->uas.request ||
hdr->parsed>=(void*)t->uas.end_request)) {
/* header parsed filed doesn't point inside uas.request memory
* chunck -> it was added by failure funcs.-> free it as pkg */
DBG("DBG:free_faked_req: removing hdr->parsed %d\n",
hdr->type);
clean_hdr_field(hdr);
hdr->parsed = 0;
}
}
}
/* return 1 if a failure_route processes */
static inline int run_failure_handlers(struct cell *t)
{
static struct sip_msg faked_req;
struct sip_msg *shmem_msg;
struct ua_client *uac;
int on_failure;
shmem_msg = t->uas.request;
uac = &t->uac[picked_branch];
/* failure_route for a local UAC? */
if (!shmem_msg || REQ_LINE(shmem_msg).method_value==METHOD_CANCEL ) {
LOG(L_WARN,"WARNING:tm:run_failure_handlers: no UAC or CANCEL "
"support (%d, %d) \n", t->on_negative, t->tmcb_hl.reg_types);
return 0;
}
/* don't start faking anything if we don't have to */
if ( !has_tran_tmcbs( t, TMCB_ON_FAILURE) && !t->on_negative ) {
LOG(L_WARN,
"Warning: run_failure_handlers: no negative handler (%d, %d)\n",
t->on_negative,
t->tmcb_hl.reg_types);
return 1;
}
if (!fake_req(&faked_req, shmem_msg, &t->uas, uac)) {
LOG(L_ERR, "ERROR: run_failure_handlers: fake_req failed\n");
return 0;
}
/* fake also the env. conforming to the fake msg */
faked_env( t, &faked_req);
/* DONE with faking ;-) -> run the failure handlers */
if ( has_tran_tmcbs( t, TMCB_ON_FAILURE) ) {
run_trans_callbacks( TMCB_ON_FAILURE, t, &faked_req,
uac->reply, uac->last_received);
}
if (t->on_negative) {
/* avoid recursion -- if failure_route forwards, and does not
* set next failure route, failure_route will not be reentered
* on failure */
on_failure = t->on_negative;
t->on_negative=0;
/* run a reply_route action if some was marked */
run_top_route(failure_rlist[on_failure], &faked_req);
}
/* restore original environment and free the fake msg */
faked_env( t, 0);
free_faked_req(&faked_req,t);
/* if failure handler changed flag, update transaction context */
shmem_msg->flags = faked_req.flags;
/* branch flags do not need to be updated as this branch will be never
* used again */
return 1;
}
static inline int do_dns_failover(struct cell *t)
{
static struct sip_msg faked_req;
struct sip_msg *shmem_msg;
struct ua_client *uac;
int ret;
shmem_msg = t->uas.request;
uac = &t->uac[picked_branch];
/* check if the DNS resolver can get at least one new IP */
if ( get_next_su( uac->proxy, &uac->request.dst.to, 1)!=0 )
return -1;
DBG("DEBUG:tm:do_dns_failover: new destination available\n");
if (!fake_req(&faked_req, shmem_msg, &t->uas, uac)) {
LOG(L_ERR, "ERROR:tm:do_dns_failover: fake_req failed\n");
return -1;
}
/* fake also the env. conforming to the fake msg */
faked_env( t, &faked_req);
ret = -1;
if (append_branch( &faked_req, &uac->uri, 0, 0, 0, uac->br_flags,
shmem_msg->force_send_socket)!=1 )
goto done;
if (t_forward_nonack( t, &faked_req, uac->proxy)==1)
ret = 0;
done:
/* restore original environment and free the fake msg */
faked_env( t, 0);
free_faked_req(&faked_req,t);
return ret;
}
/* select a branch for forwarding; returns:
* 0..X ... branch number
* -1 ... error
* -2 ... can't decide yet -- incomplete branches present
*/
static inline int t_pick_branch( struct cell *t, int *res_code)
{
int lowest_b, lowest_s, b;
int cancelled;
lowest_b=-1; lowest_s=999;
cancelled = (t->flags&T_WAS_CANCELLED_FLAG);
for ( b=t->first_branch; b<t->nr_of_outgoings ; b++ ) {
/* skip 'empty branches' */
if (!t->uac[b].request.buffer.s) continue;
/* there is still an unfinished UAC transaction; wait now! */
if ( t->uac[b].last_received<200 )
return -2;
/* replyes to cancel has max priority */
if ( (cancelled && t->uac[b].last_received==487) ||
(t->uac[b].last_received<lowest_s && (lowest_s!=487 || !cancelled))) {
lowest_b =b;
lowest_s = t->uac[b].last_received;
}
} /* find lowest branch */
DBG("DEBUG:tm:t_pick_branch: picked branch %d, code %d\n",
lowest_b,lowest_s);
*res_code=lowest_s;
return lowest_b;
}
/* 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;
/* 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
*/
DBG("DEBUG:tm:t_should_relay_response: 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) {
DBG("DEBUG:tm:t_should_relay_response: 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) {
DBG("DEBUG:tm:t_should_relay_response: 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) {
DBG("DEBUG:tm:t_should_relay_response: 487 reply came for a "
"timed-out branch\n");
} else {
/* this looks however how a very strange status rewrite attempt;
* report on it */
DBG("DEBUG:tm:t_should_relay_response: 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) {
/* this is a winner and close all branches */
which_cancel( Trans, cancel_bitmap );
picked_branch=branch;
} else {
/* if all_final return lowest */
picked_branch = t_pick_branch( Trans, &picked_code);
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) {
LOG(L_CRIT, "ERROR:tm:t_should_relay_response: pick_branch "
"failed (lowest==-1) for code %d\n",new_code);
Trans->uac[branch].reply = 0;
goto discard;
}
}
/* 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;
if ( !(Trans->flags&T_NO_DNS_FAILOVER_FLAG) &&
Trans->uac[picked_branch].proxy!=NULL ) {
/* is is a DNS failover scenario? - according to RFC 3263
* this means 503 reply or timeout with no reply */
DBG("DEBUG:tm:t_should_relay_response: dns-failover test: "
"branch=%d, last_recv=%d, flags=%X\n",
picked_branch, Trans->uac[picked_branch].last_received,
Trans->uac[picked_branch].flags);
if ( Trans->uac[picked_branch].last_received==503 ||
(Trans->uac[picked_branch].last_received==408 &&
(Trans->uac[picked_branch].flags&T_UAC_HAS_RECV_REPLY)==0)
) {
DBG("DEBUG:tm:t_should_relay_response: 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) {
/* 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;
}
/* Retransmits the last sent inbound reply.
* input: p_msg==request for which I want to retransmit an associated reply
* Returns -1 - error
* 1 - OK
*/
int t_retransmit_reply( struct cell *t )
{
static char b[BUF_SIZE];
int len;
/* we need to lock the transaction as messages from
upstream may change it continuously */
LOCK_REPLIES( t );
if (!t->uas.response.buffer.s) {
DBG("DEBUG:tm:t_retransmit_reply: nothing to retransmit\n");
goto error;
}
/* response.dst.send_sock should be valid all the time now, as it's taken
from original request -bogdan */
if (t->uas.response.dst.send_sock==0) {
LOG(L_CRIT,"BUG:tm:t_retransmit_reply: something to retransmit, but"
"send_sock is NULL\n");
goto error;
}
len=t->uas.response.buffer.len;
if ( len==0 || len>BUF_SIZE ) {
DBG("DEBUG:tm:t_retransmit_reply: zero length or too big "
"to retransmit: %d\n", len);
goto error;
}
memcpy( b, t->uas.response.buffer.s, len );
UNLOCK_REPLIES( t );
SEND_PR_BUFFER( & t->uas.response, b, len );
DBG("DEBUG:tm:t_retransmit_reply: buf=%p: %.9s..., shmem=%p: %.9s\n",
b, b, t->uas.response.buffer.s, t->uas.response.buffer.s );
return 1;
error:
UNLOCK_REPLIES(t);
return -1;
}
int t_reply( struct cell *t, struct sip_msg* p_msg, unsigned int code,
str * text )
{
return _reply( t, p_msg, code, text, 1 /* lock replies */ );
}
int t_reply_unsafe( struct cell *t, struct sip_msg* p_msg, unsigned int code,
str * text )
{
return _reply( t, p_msg, code, text, 0 /* don't lock replies */ );
}
void set_final_timer( /* struct s_table *h_table, */ struct cell *t )
{
if ( !is_local(t) && t->uas.request->REQ_METHOD==METHOD_INVITE ) {
/* crank timers for negative replies */
if (t->uas.status>=300) {
start_retr(&t->uas.response);
return;
}
/* local UAS retransmits too */
if (t->relaied_reply_branch==-2 && t->uas.status>=200) {
/* we retransmit 200/INVs regardless of transport --
even if TCP used, UDP could be used upstream and
loose the 200, which is not retransmitted by proxies
*/
force_retr( &t->uas.response );
return;
}
}
put_on_wait(t);
}
void cleanup_uac_timers( struct cell *t )
{
int i;
/* reset FR/retransmission timers */
for (i=t->first_branch; i<t->nr_of_outgoings; i++ ) {
reset_timer( &t->uac[i].request.retr_timer );
reset_timer( &t->uac[i].request.fr_timer );
}
DBG("DEBUG: cleanup_uac_timers: RETR/FR timers reset\n");
}
static int store_reply( struct cell *trans, int branch, struct sip_msg *rpl)
{
# ifdef EXTRA_DEBUG
if (trans->uac[branch].reply) {
LOG(L_ERR, "ERROR: replacing stored reply; aborting\n");
abort();
}
# endif
/* when we later do things such as challenge aggregation,
we should parse the message here before we conserve
it in shared memory; -jiri
*/
if (rpl==FAKED_REPLY)
trans->uac[branch].reply=FAKED_REPLY;
else
trans->uac[branch].reply = sip_msg_cloner( rpl, 0 );
if (! trans->uac[branch].reply ) {
LOG(L_ERR, "ERROR: store_reply: can't alloc' clone memory\n");
return 0;
}
return 1;
}
/* this is the code which decides what and when shall be relayed
upstream; note well -- it assumes it is entered locked with
REPLY_LOCK and it returns unlocked!
*/
enum rps relay_reply( struct cell *t, struct sip_msg *p_msg, int branch,
unsigned int msg_status, branch_bm_t *cancel_bitmap )
{
int relay;
int save_clone;
char *buf;
/* length of outbound reply */
unsigned int res_len;
int relayed_code;
struct sip_msg *relayed_msg;
struct bookmark bm;
int totag_retr;
enum rps reply_status;
/* retransmission structure of outbound reply and request */
struct retr_buf *uas_rb;
str cb_s;
str text;
/* keep compiler warnings about use of uninit vars silent */
res_len=0;
buf=0;
relayed_msg=0;
relayed_code=0;
totag_retr=0;
/* remember, what was sent upstream to know whether we are
* forwarding a first final reply or not */
/* *** store and relay message as needed *** */
reply_status = t_should_relay_response(t, msg_status, branch,
&save_clone, &relay, cancel_bitmap, p_msg );
DBG("DEBUG:tm:relay_reply: branch=%d, save=%d, relay=%d\n",
branch, save_clone, relay );
/* store the message if needed */
if (save_clone) /* save for later use, typically branch picking */
{
if (!store_reply( t, branch, p_msg ))
goto error01;
}
uas_rb = & t->uas.response;
if (relay >= 0 ) {
/* initialize sockets for outbound reply */
uas_rb->activ_type=msg_status;
/* only messages known to be relayed immediately will be
* be called on; we do not evoke this callback on messages
* stored in shmem -- they are fixed and one cannot change them
* anyway */
if (msg_status<300 && branch==relay
&& has_tran_tmcbs(t,TMCB_RESPONSE_FWDED) ) {
run_trans_callbacks( TMCB_RESPONSE_FWDED, t, t->uas.request,
p_msg, msg_status );
}
/* try building the outbound reply from either the current
* or a stored message */
relayed_msg = branch==relay ? p_msg : t->uac[relay].reply;
if (relayed_msg==FAKED_REPLY) {
relayed_code = branch==relay
? msg_status : t->uac[relay].last_received;
text.s = error_text(relayed_code);
text.len = strlen(text.s); /* FIXME - bogdan*/
if (relayed_code>=180 && t->uas.request->to
&& (get_to(t->uas.request)->tag_value.s==0
|| get_to(t->uas.request)->tag_value.len==0)) {
calc_crc_suffix( t->uas.request, tm_tag_suffix );
buf = build_res_buf_from_sip_req(
relayed_code,
&text,
&tm_tag,
t->uas.request, &res_len, &bm );
} else {
buf = build_res_buf_from_sip_req( relayed_code,
&text, 0/* no to-tag */,
t->uas.request, &res_len, &bm );
}
} else {
relayed_code=relayed_msg->REPLY_STATUS;
buf = build_res_buf_from_sip_res( relayed_msg, &res_len );
/* if we build a message from shmem, we need to remove
via delete lumps which are now stirred in the shmem-ed
structure
*/
if (branch!=relay) {
free_via_clen_lump(&relayed_msg->add_rm);
}
}
if (!buf) {
LOG(L_ERR, "ERROR:tm:relay_reply: "
"no mem for outbound reply buffer\n");
goto error02;
}
/* attempt to copy the message to UAS's shmem:
- copy to-tag for ACK matching as well
- allocate little a bit more for provisional as
larger messages are likely to follow and we will be
able to reuse the memory frag
*/
uas_rb->buffer.s = (char*)shm_resize( uas_rb->buffer.s, res_len +
(msg_status<200 ? REPLY_OVERBUFFER_LEN : 0));
if (!uas_rb->buffer.s) {
LOG(L_ERR, "ERROR:tm:relay_reply: cannot alloc reply shmem\n");
goto error03;
}
uas_rb->buffer.len = res_len;
memcpy( uas_rb->buffer.s, buf, res_len );
if (relayed_msg==FAKED_REPLY) { /* to-tags for local replies */
update_local_tags(t, &bm, uas_rb->buffer.s, buf);
}
stats_trans_rpl( relayed_code, (relayed_msg==FAKED_REPLY)?1:0 );
/* update the status ... */
t->uas.status = relayed_code;
t->relaied_reply_branch = relay;
if (is_invite(t) && relayed_msg!=FAKED_REPLY
&& relayed_code>=200 && relayed_code < 300
&& has_tran_tmcbs( t, TMCB_RESPONSE_OUT|TMCB_E2EACK_IN) ) {
totag_retr=update_totag_set(t, relayed_msg);
}
}; /* if relay ... */
UNLOCK_REPLIES( t );
/* Setup retransmission timer _before_ the reply is sent
* to avoid race conditions
*/
if (reply_status == RPS_COMPLETED) {
set_final_timer(t);
}
/* send it now (from the private buffer) */
if (relay >= 0) {
SEND_PR_BUFFER( uas_rb, buf, res_len );
DBG("DEBUG:tm:relay_reply: sent buf=%p: %.9s..., shmem=%p: %.9s\n",
buf, buf, uas_rb->buffer.s, uas_rb->buffer.s );
if (!totag_retr && has_tran_tmcbs(t, TMCB_RESPONSE_OUT) ) {
cb_s.s = buf;
cb_s.len = res_len;
set_extra_tmcb_params( &cb_s, &uas_rb->dst);
run_trans_callbacks( TMCB_RESPONSE_OUT, t, t->uas.request,
relayed_msg, relayed_code);
}
pkg_free( buf );
}
/* success */
return reply_status;
error03:
pkg_free( buf );
error02:
if (save_clone) {
if (t->uac[branch].reply!=FAKED_REPLY)
sip_msg_free( t->uac[branch].reply );
t->uac[branch].reply = NULL;
}
error01:
text.s = "Reply processing error";
text.len = sizeof("Reply processing error")-1;
t_reply_unsafe( t, t->uas.request, 500, &text );
UNLOCK_REPLIES(t);
if (is_invite(t)) cancel_uacs( t, *cancel_bitmap );
/* a serious error occurred -- attempt to send an error reply;
it will take care of clean-ups */
/* failure */
return RPS_ERROR;
}
/* 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 );
DBG("DEBUG:tm:local_reply: 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_E2EACK_IN) ) {
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)) {
DBG("DEBUG: Passing provisional reply %d to FIFO "
"application\n", winning_code);
run_trans_callbacks( TMCB_LOCAL_RESPONSE_OUT, t, 0,
winning_msg, winning_code);
}
} else {
DBG("DEBUG:tm:local_reply: 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;
}
/* This function is called whenever a reply for our module is received;
* we need to register this function on module initialization;
* Returns : 0 - core router stops
* 1 - core router relay statelessly
*/
int reply_received( struct sip_msg *p_msg )
{
int msg_status;
int last_uac_status;
int branch;
int reply_status;
utime_t timer;
/* has the transaction completed now and we need to clean-up? */
branch_bm_t cancel_bitmap;
struct ua_client *uac;
struct cell *t;
struct usr_avp **backup_list;
/* make sure we know the associated transaction ... */
if (t_check(p_msg, &branch ) == -1) goto not_found;
/*... if there is none, tell the core router to fwd statelessly */
t = get_t();
if ((t == 0) || (t == T_UNDEFINED)) goto not_found;
cancel_bitmap=0;
msg_status=p_msg->REPLY_STATUS;
uac=&t->uac[branch];
DBG("DEBUG:tm:reply_received: org. status uas=%d, "
"uac[%d]=%d local=%d is_invite=%d)\n",
t->uas.status, branch, uac->last_received,
is_local(t), is_invite(t));
last_uac_status=uac->last_received;
if_update_stat( tm_enable_stats, tm_rcv_rpls , 1);
/* it's a cancel which is not e2e ? */
if ( get_cseq(p_msg)->method_id==METHOD_CANCEL && is_invite(t) ) {
/* ... then just stop timers */
reset_timer( &uac->local_cancel.retr_timer);
if ( msg_status >= 200 ) {
reset_timer( &uac->local_cancel.fr_timer);
}
DBG("DEBUG:tm:reply_received: reply to local CANCEL processed\n");
goto done;
}
/* *** stop timers *** */
/* stop retransmission */
reset_timer(&uac->request.retr_timer);
/* stop final response timer only if I got a final response */
if ( msg_status >= 200 ) {
reset_timer( &uac->request.fr_timer);
}
/* acknowledge negative INVITE replies (do it before detailed
* on_reply processing, which may take very long, like if it
* is attempted to establish a TCP connection to a fail-over dst */
if (is_invite(t) && ((msg_status >= 300) ||
(is_local(t) && !no_autoack(t) && msg_status >= 200) )) {
if (send_ack(p_msg, t, branch)!=0)
LOG(L_ERR, "ERROR:tm:reply_received: failed to send ACK "
"(local=%s)\n", is_local(t)?"yes":"no");
}
/* processing of on_reply block */
if (t->on_reply) {
if (onreply_avp_mode) {
/* lock the reply*/
LOCK_REPLIES( t );
/* set the as avp_list the one from transaction */
backup_list = set_avp_list(&t->user_avps);
} else {
backup_list = 0;
}
/* transfer transaction flag to branch context */
p_msg->flags = t->uas.request->flags;
setb0flags(t->uac[branch].br_flags);
/* run block */
if ( (run_top_route(onreply_rlist[t->on_reply], p_msg)&ACT_FL_DROP) &&
(msg_status<200) ) {
if (onreply_avp_mode) {
UNLOCK_REPLIES( t );
set_avp_list( backup_list );
}
DBG("DEBUG:tm:reply_received: dropping provisional reply %d\n",
msg_status);
goto done;
}
/* transfer current message context back to t */
t->uac[branch].br_flags = getb0flags();
t->uas.request->flags = p_msg->flags;
if (onreply_avp_mode)
/* restore original avp list */
set_avp_list( backup_list );
}
if (!onreply_avp_mode || !t->on_reply)
/* lock the reply*/
LOCK_REPLIES( t );
/* mark that the UAC received replies */
uac->flags |= T_UAC_HAS_RECV_REPLY;
if (t->uac[branch].flags&T_UAC_TO_CANCEL_FLAG) {
if ( msg_status < 200 )
/* reply for an UAC with a pending cancel -> do cancel now */
cancel_branch(t, branch);
/* reset flag */
t->uac[branch].flags &= ~(T_UAC_TO_CANCEL_FLAG);
}
if (is_local(t)) {
reply_status = local_reply(t,p_msg, branch,msg_status,&cancel_bitmap);
if (reply_status == RPS_COMPLETED) {
cleanup_uac_timers(t);
if (is_invite(t)) cancel_uacs(t, cancel_bitmap);
/* There is no need to call set_final_timer because we know
* that the transaction is local */
put_on_wait(t);
}
} else {
reply_status = relay_reply(t,p_msg,branch,msg_status,&cancel_bitmap);
/* clean-up the transaction when transaction completed */
if (reply_status == RPS_COMPLETED) {
/* no more UAC FR/RETR (if I received a 2xx, there may
* be still pending branches ...
*/
cleanup_uac_timers(t);
if (is_invite(t)) cancel_uacs(t, cancel_bitmap);
/* FR for negative INVITES, WAIT anything else */
/* set_final_timer(t); */
}
}
if (reply_status == RPS_ERROR || reply_status== RPS_DISCARDED)
goto done;
/* update FR/RETR timers on provisional replies */
if (msg_status < 200 && (restart_fr_on_each_reply ||
((last_uac_status<msg_status) &&
((msg_status >= 180) || (last_uac_status == 0)))
) ) { /* provisional now */
if (is_invite(t)) {
/* invite: change FR to longer FR_INV, do not
* attempt to restart retransmission any more
*/
backup_list = set_avp_list(&t->user_avps);
if (!fr_inv_avp2timer(&timer)) {
DBG("DEBUG:tm:reply_received: FR_INV_TIMER = %lld\n", timer);
set_timer(&uac->request.fr_timer,
FR_INV_TIMER_LIST, &timer);
t->flags |= T_NOISY_CTIMER_FLAG;
} else {
set_timer(& uac->request.fr_timer, FR_INV_TIMER_LIST, 0);
}
set_avp_list(backup_list);
} else {
/* non-invite: restart retransmissions (slow now) */
uac->request.retr_list = RT_T2;
set_timer(&uac->request.retr_timer, RT_T2, 0);
}
} /* provisional replies */
done:
/* we are done with the transaction, so unref it - the reference
* was incremented by t_check() function -bogdan*/
t_unref(p_msg);
/* don't try to relay statelessly neither on success
* (we forwarded statefully) nor on error; on troubles,
* simply do nothing; that will make the other party to
* retransmit; hopefuly, we'll then be better off
*/
return 0;
not_found:
set_t(T_UNDEFINED);
return 1;
}
int t_reply_with_body( struct cell *trans, unsigned int code, str *text,
str *body, str *new_header, str *to_tag )
{
struct lump_rpl *hdr_lump;
struct lump_rpl *body_lump;
str rpl;
int ret;
struct bookmark bm;
/* mark the transaction as replied */
if (code>=200) set_kr(REQ_RPLD);
/* add the lumps for new_header and for body (by bogdan) */
if (new_header && new_header->len) {
hdr_lump = add_lump_rpl( trans->uas.request, new_header->s,
new_header->len, LUMP_RPL_HDR );
if ( !hdr_lump ) {
LOG(L_ERR,"ERROR:tm:t_reply_with_body: cannot add hdr lump\n");
goto error;
}
} else {
hdr_lump = 0;
}
/* body lump */
if(body && body->len) {
body_lump = add_lump_rpl( trans->uas.request, body->s, body->len,
LUMP_RPL_BODY );
if (body_lump==0) {
LOG(L_ERR,"ERROR:tm:t_reply_with_body: cannot add body lump\n");
goto error_1;
}
} else {
body_lump = 0;
}
rpl.s = build_res_buf_from_sip_req(
code, text, to_tag,
trans->uas.request, (unsigned int*)&rpl.len, &bm);
/* since the msg (trans->uas.request) is a clone into shm memory, to avoid
* memory leak or crashing (lumps are create in private memory) I will
* remove the lumps by myself here (bogdan) */
if ( hdr_lump ) {
unlink_lump_rpl( trans->uas.request, hdr_lump);
free_lump_rpl( hdr_lump );
}
if( body_lump ) {
unlink_lump_rpl( trans->uas.request, body_lump);
free_lump_rpl( body_lump );
}
if (rpl.s==0) {
LOG(L_ERR,"ERROR:tm:t_reply_with_body: failed in doing "
"build_res_buf_from_sip_req()\n");
goto error;
}
DBG("DEBUG:tm:t_reply_with_body: buffer computed\n");
ret=_reply_light( trans, rpl.s, rpl.len, code, to_tag->s, to_tag->len,
1 /* lock replies */, &bm );
/* unref since this it's used only internaly */
UNREF(trans);
return ret;
error_1:
if ( hdr_lump ) {
unlink_lump_rpl( trans->uas.request, hdr_lump);
free_lump_rpl( hdr_lump );
}
error:
return -1;
}
static int parse_transid(str* s, unsigned int* index, unsigned int* label)
{
char* buf;
if (!s || !index || !label) {
LOG(L_ERR, "ERROR:tm:parse_transid: Invalid parameter value\n");
return -1;
}
buf = (char*)pkg_malloc(s->len + 1);
if (!buf) {
LOG(L_ERR, "ERROR:tm:parse_transid: No memory left\n");
return -1;
}
memcpy(buf, s->s, s->len + 1);
buf[s->len] = '\0';
if (sscanf(buf, "%u:%u", index, label) != 2) {
LOG(L_ERR, "ERROR:tm:parse_transid: Invalid trans_id (%s)\n", buf);
pkg_free(buf);
return -1;
}
DBG("DEBUG:tm:parse_transid: hash_index=%u label=%u\n", *index, *label);
pkg_free(buf);
return 0;
}
static int send_reply(struct cell *trans, unsigned int code, str* text, str* body,
str* headers, str* to_tag)
{
struct lump_rpl *hdr_lump, *body_lump;
str rpl;
int ret;
struct bookmark bm;
/* mark the transaction as replied */
if (code >= 200) set_kr(REQ_RPLD);
/* add the lumps for new_header and for body (by bogdan) */
if (headers && headers->len) {
hdr_lump = add_lump_rpl(trans->uas.request, headers->s, headers->len,
LUMP_RPL_HDR);
if (!hdr_lump) {
LOG(L_ERR, "ERROR:tm:send_reply: cannot add hdr lump\n");
goto sr_error;
}
} else {
hdr_lump = 0;
}
/* body lump */
if (body && body->len) {
body_lump = add_lump_rpl(trans->uas.request, body->s, body->len,
LUMP_RPL_BODY);
if (body_lump == 0) {
LOG(L_ERR,"ERROR:tm:send_reply: cannot add body lump\n");
goto sr_error_1;
}
} else {
body_lump = 0;
}
rpl.s = build_res_buf_from_sip_req(code, text, to_tag,
trans->uas.request, (unsigned int*)&rpl.len, &bm);
/* since the msg (trans->uas.request) is a clone into shm memory, to avoid
* memory leak or crashing (lumps are create in private memory) I will
* remove the lumps by myself here (bogdan) */
if (hdr_lump) {
unlink_lump_rpl(trans->uas.request, hdr_lump);
free_lump_rpl(hdr_lump);
}
if (body_lump) {
unlink_lump_rpl(trans->uas.request, body_lump);
free_lump_rpl(body_lump);
}
if (rpl.s == 0) {
LOG(L_ERR,"ERROR:tm:send_reply: failed in build_res_buf_from_sip_req\n");
goto sr_error;
}
ret = _reply_light(trans, rpl.s, rpl.len, code, to_tag->s, to_tag->len,
1 /* lock replies */, &bm);
/* unref since this it's used only internaly */
UNREF(trans);
return ret;
sr_error_1:
if (hdr_lump) {
unlink_lump_rpl(trans->uas.request, hdr_lump);
free_lump_rpl(hdr_lump);
}
sr_error:
return -1;
}
int unixsock_t_reply(str* msg)
{
int ret;
struct cell *trans;
static char new_headers[MAX_HEADER];
str code, reason, transid, headers, body, to_tag;
unsigned int hash_index, label, icode;
headers.s = new_headers;
headers.len = MAX_HEADER;
if (unixsock_read_line(&code, msg) != 0) {
unixsock_reply_asciiz("400 Reason code expected\n");
goto err;
}
icode = str2s(code.s, code.len, &ret);
if (ret) {
unixsock_reply_printf("400 Reason code has wrong format\n");
goto err;
}
if (unixsock_read_line(&reason, msg) != 0) {
unixsock_reply_asciiz("400 Reason phrase expected\n");
goto err;
}
if (unixsock_read_line(&transid, msg) != 0) {
unixsock_reply_asciiz("400 Transaction ID expected\n");
goto err;
}
if (parse_transid(&transid, &hash_index, &label) < 0) {
unixsock_reply_asciiz("400 Error while parsing transaction ID\n");
goto err;
}
if (unixsock_read_line(&to_tag, msg) != 0) {
unixsock_reply_asciiz("400 To tag expected\n");
goto err;
}
/* read the new headers */
if (unixsock_read_lineset(&headers, msg) < 0) {
unixsock_reply_asciiz("400 Error while reading new headers\n");
goto err;
}
DBG("lineset: %.*s\n", headers.len, headers.s);
/* body can be empty ... */
if (unixsock_read_body(&body, msg) < 0) {
unixsock_reply_asciiz("400 Error while reading body\n");
goto err;
}
DBG("body: %.*s\n", body.len, body.s);
if (t_lookup_ident(&trans, hash_index, label) < 0) {
LOG(L_ERR,"ERROR:tm:unixsock_t_reply: lookup failed\n");
unixsock_reply_asciiz("481 No such transaction\n");
goto err;
}
/* it's refcounted now, t_reply_with body unrefs for me -- I can
* continue but may not use T anymore
*/
ret = send_reply(trans, icode, &reason, &body, &headers, &to_tag);
if (ret < 0) {
LOG(L_ERR, "ERROR:tm:unixsock_t_reply: reply failed\n");
unixsock_reply_asciiz("500 Reply failed\n");
goto err;
}
unixsock_reply_asciiz("200 Succeeded\n");
unixsock_reply_send();
return 1;
err:
unixsock_reply_send();
return -1;
}
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