/
dlg_handlers.c
1892 lines (1572 loc) · 50.6 KB
/
dlg_handlers.c
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/*
* $Id$
*
* Copyright (C) 2006-2009 Voice System SRL
*
* This file is part of opensips, a free SIP server.
*
* opensips 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
*
* opensips 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:
* --------
* 2006-04-14 initial version (bogdan)
* 2006-11-28 Added support for tracking the number of early dialogs, and the
* number of failed dialogs. This involved updates to dlg_onreply()
* (Jeffrey Magder - SOMA Networks)
* 2007-03-06 syncronized state machine added for dialog state. New tranzition
* design based on events; removed num_1xx and num_2xx (bogdan)
* 2007-04-30 added dialog matching without DID (dialog ID), but based only
* on RFC3261 elements - based on an original patch submitted
* by Michel Bensoussan <michel@extricom.com> (bogdan)
* 2007-05-17 new feature: saving dialog info into a database if
* realtime update is set(ancuta)
* 2007-07-06 support for saving additional dialog info : cseq, contact,
* route_set and socket_info for both caller and callee (ancuta)
* 2007-07-10 Optimized dlg_match_mode 2 (DID_NONE), it now employs a proper
* hash table lookup and isn't dependant on the is_direction
* function (which requires an RR param like dlg_match_mode 0
* anyways.. ;) ; based on a patch from
* Tavis Paquette <tavis@galaxytelecom.net>
* and Peter Baer <pbaer@galaxytelecom.net> (bogdan)
* 2008-04-04 added direction reporting in dlg callbacks (bogdan)
* 2009-09-09 support for early dialogs added; proper handling of cseq
* while PRACK is used (bogdan)
*/
#include <string.h>
#include <time.h>
#include "../../pvar.h"
#include "../../timer.h"
#include "../../statistics.h"
#include "../../data_lump.h"
#include "../../parser/parse_to.h"
#include "../../parser/parse_cseq.h"
#include "../../parser/contact/parse_contact.h"
#include "../../parser/parse_rr.h"
#include "../../parser/parse_cseq.h"
#include "../../parser/parse_hname2.h"
#include "../../parser/parser_f.h"
#include "../tm/tm_load.h"
#include "../rr/api.h"
#include "dlg_hash.h"
#include "dlg_timer.h"
#include "dlg_cb.h"
#include "dlg_handlers.h"
#include "dlg_db_handler.h"
#include "dlg_profile.h"
#include "dlg_req_within.h"
#include "dlg_tophiding.h"
#include "dlg_replication.h"
extern str rr_param;
static pv_spec_t *timeout_avp;
static int default_timeout;
static int shutdown_done = 0;
extern int seq_match_mode;
extern struct rr_binds d_rrb;
/* statistic variables */
extern stat_var *early_dlgs;
extern stat_var *processed_dlgs;
extern stat_var *expired_dlgs;
extern stat_var *failed_dlgs;
int last_dst_leg = -1;
void init_dlg_handlers(pv_spec_t *timeout_avp_p ,int default_timeout_p)
{
timeout_avp = timeout_avp_p;
default_timeout = default_timeout_p;
}
void destroy_dlg_handlers(void)
{
shutdown_done = 1;
}
static inline int add_dlg_rr_param(struct sip_msg *req, unsigned int entry,
unsigned int id)
{
static char buf[RR_DLG_PARAM_SIZE];
str s;
int n;
char *p;
s.s = p = buf;
*(p++) = ';';
memcpy(p, rr_param.s, rr_param.len);
p += rr_param.len;
*(p++) = '=';
n = RR_DLG_PARAM_SIZE - (p-buf);
if (int2reverse_hex( &p, &n, entry)==-1)
return -1;
*(p++) = DLG_SEPARATOR;
n = RR_DLG_PARAM_SIZE - (p-buf);
if (int2reverse_hex( &p, &n, id)==-1)
return -1;
s.len = p-buf;
if (d_rrb.add_rr_param( req, &s)<0) {
LM_ERR("failed to add rr param\n");
return -1;
}
return 0;
}
static inline void get_routing_info(struct sip_msg *msg, int is_req,
unsigned int *skip_rrs, str *contact, str *rr_set)
{
/* extract the contact address */
if (!msg->contact&&(parse_headers(msg,HDR_CONTACT_F,0)<0||!msg->contact)){
//LM_ERR("bad sip message or missing Contact hdr\n");
contact->s = NULL;
contact->len = 0;
} else {
if ( parse_contact(msg->contact)<0 ||
((contact_body_t *)msg->contact->parsed)->contacts==NULL ||
((contact_body_t *)msg->contact->parsed)->contacts->next!=NULL ) {
LM_ERR("bad Contact HDR\n");
contact->s = NULL;
contact->len = 0;
} else {
*contact = ((contact_body_t *)msg->contact->parsed)->contacts->uri;
}
}
/* extract the RR parts - parse all headers as we can have multiple
RR headers in the same message */
if( parse_headers(msg,HDR_EOH_F,0)<0 ){
LM_ERR("failed to parse record route header\n");
rr_set->s = 0;
rr_set->len = 0;
} else {
if(msg->record_route){
if( print_rr_body(msg->record_route, rr_set, !is_req,
skip_rrs) != 0 ){
LM_ERR("failed to print route records \n");
rr_set->s = 0;
rr_set->len = 0;
}
} else {
rr_set->s = 0;
rr_set->len = 0;
}
}
}
/*usage: dlg: the dialog to add cseq, contact & record_route
* msg: sip message
* flag: 0-for a request(INVITE),
* 1- for a reply(200 ok)
*
* for a request: get record route in normal order
* for a reply : get in reverse order, skipping the ones from the request and
* the proxies' own
*/
static int init_leg_info( struct dlg_cell *dlg, struct sip_msg *msg,
struct cell* t, str *tag,str *mangled_from,str *mangled_to)
{
unsigned int skip_recs;
str cseq;
str contact;
str rr_set;
int is_req;
is_req = (msg->first_line.type==SIP_REQUEST)?1:0;
/* extract the cseq number as string */
if (is_req) {
/* cseq */
if((!msg->cseq && (parse_headers(msg,HDR_CSEQ_F,0)<0 || !msg->cseq)) ||
!msg->cseq->parsed){
LM_ERR("bad sip message or missing CSeq hdr :-/\n");
goto error0;
}
cseq = (get_cseq(msg))->number;
/* routing info */
skip_recs = 0;
get_routing_info(msg, is_req, &skip_recs, &contact, &rr_set);
dlg->from_rr_nb = skip_recs;
} else {
/* use the same as in invite cseq in caller leg */
cseq = dlg->legs[DLG_CALLER_LEG].inv_cseq;
if ((dlg->flags & DLG_FLAG_TOPHIDING) && (msg->REPLY_STATUS<200 &&
msg->REPLY_STATUS>100)) {
/* save contact && rr_set , may need need to route requests
* before the INVITE transaction terminates */
get_routing_info(msg,is_req,0,&contact,&rr_set);
} else {
/* no need to save these here, wait for final response */
rr_set.len = contact.len = 0;
rr_set.s = contact.s = NULL;
}
}
LM_DBG("route_set %.*s, contact %.*s, cseq %.*s and bind_addr %.*s\n",
rr_set.len, ZSW(rr_set.s), contact.len, ZSW(contact.s),
cseq.len, cseq.s,
msg->rcv.bind_address->sock_str.len,
msg->rcv.bind_address->sock_str.s);
if (dlg_add_leg_info( dlg, tag, &rr_set, &contact, &cseq,
msg->rcv.bind_address,mangled_from,mangled_to)!=0) {
LM_ERR("dlg_add_leg_info failed\n");
if (rr_set.s) pkg_free(rr_set.s);
goto error0;
}
if (rr_set.s) pkg_free(rr_set.s);
return 0;
error0:
return -1;
}
static str extracted_to_uri;
static inline str* extract_mangled_touri(str *mangled_to_hdr)
{
struct to_body to_b;
struct hdr_field hdr;
char *tmp,*end;
if (mangled_to_hdr->len == 0 || mangled_to_hdr->s == NULL)
return NULL;
end = mangled_to_hdr->s+mangled_to_hdr->len;
tmp=parse_hname2(mangled_to_hdr->s,end,&hdr);
if (hdr.type==HDR_ERROR_T) {
LM_ERR("bad to header\n");
return NULL;
}
tmp = eat_lws_end(tmp,end);
if (tmp >= end) {
LM_ERR("empty header\n");
return NULL;
}
parse_to(tmp,end,&to_b);
if (to_b.error == PARSE_ERROR) {
LM_ERR("bad to header [%.*s]\n",mangled_to_hdr->len,mangled_to_hdr->s);
return NULL;
}
extracted_to_uri = to_b.uri;
free_to_params(&to_b);
LM_DBG("extracted to uri [%.*s]\n",extracted_to_uri.len,extracted_to_uri.s);
return &extracted_to_uri;
}
static str extracted_from_uri;
static inline str* extract_mangled_fromuri(str *mangled_from_hdr)
{
struct to_body from_b;
struct hdr_field hdr;
char *tmp,*end;
if (mangled_from_hdr->len == 0 || mangled_from_hdr->s == NULL)
return NULL;
end = mangled_from_hdr->s+mangled_from_hdr->len;
tmp=parse_hname2(mangled_from_hdr->s,end,&hdr);
if (hdr.type==HDR_ERROR_T) {
LM_ERR("bad from header\n");
return NULL;
}
tmp=eat_lws_end(tmp, end);
if (tmp >= end) {
LM_ERR("empty header\n");
return NULL;
}
parse_to(tmp,end,&from_b);
if (from_b.error == PARSE_ERROR) {
LM_ERR("bad from header [%.*s]\n",mangled_from_hdr->len,mangled_from_hdr->s);
return NULL;
}
extracted_from_uri = from_b.uri;
free_to_params(&from_b);
LM_DBG("extracted from uri [%.*s]\n",extracted_from_uri.len,extracted_from_uri.s);
return &extracted_from_uri;
}
static inline void push_reply_in_dialog(struct sip_msg *rpl, struct cell* t,
struct dlg_cell *dlg,str *mangled_from,str *mangled_to)
{
str tag,contact,rr_set;
unsigned int leg, skip_rrs;
/* get to tag*/
if ( !rpl->to && ((parse_headers(rpl,HDR_TO_F,0)<0) || !rpl->to) ){
LM_ERR("bad reply or missing TO hdr :-/\n");
tag.s = 0;
tag.len = 0;
} else {
tag = get_to(rpl)->tag_value;
if (tag.s==0 || tag.len==0) {
/* Don't print error for final replies in DLG_STATE_UNCONFIRMED */
if (!(dlg->state == DLG_STATE_UNCONFIRMED &&
rpl->first_line.u.reply.statuscode >= 300)) {
LM_ERR("[%d] reply in dlg state [%d]: missing TAG param in TO hdr\n",
rpl->first_line.u.reply.statuscode, dlg->state);
}
tag.s = 0;
tag.len = 0;
}
}
LM_DBG("%p totag in rpl is <%.*s> (%d)\n",
dlg, tag.len,tag.s,tag.len);
/* ignore provisional replies replies without totag */
if (tag.len==0 && rpl->REPLY_STATUS<200 )
return;
/* is the totag already known ?? */
for(leg=DLG_FIRST_CALLEE_LEG ; leg<dlg->legs_no[DLG_LEGS_USED] ; leg++ ) {
if ( dlg->legs[leg].tag.len==tag.len &&
strncmp(dlg->legs[leg].tag.s,tag.s,tag.len)==0 ) {
/* we have a match -> branch already known... */
LM_DBG("branch with tag <%.*s> already exists\n",tag.len,tag.s);
goto routing_info;
}
}
/* coooool :D ....new totag learned !! -> store it */
/* save callee's tag and cseq */
LM_DBG("new branch with tag <%.*s>\n",tag.len,tag.s);
if (init_leg_info( dlg, rpl, t, &tag,extract_mangled_fromuri(mangled_from),
extract_mangled_touri(mangled_to)) !=0) {
LM_ERR("could not add further info to the dialog\n");
return;
}
leg = dlg->legs_no[DLG_LEGS_USED] - 1; /* idx of last created leg */
routing_info:
/* update dlg info only if 2xx reply and if not already done so */
if (rpl->REPLY_STATUS>=200 && rpl->REPLY_STATUS<300 &&
dlg->legs_no[DLG_LEG_200OK] != leg) {
/* set this branch as primary */
if (!dlg->legs_no[DLG_LEG_200OK])
dlg->legs_no[DLG_LEG_200OK] = leg;
/* update routing info */
if(dlg->flags & DLG_FLAG_TOPHIDING)
skip_rrs = 0; /* changed here for contact - it was 1 */
else
skip_rrs = dlg->from_rr_nb +
((t->relaied_reply_branch>=0)?
(t->uac[t->relaied_reply_branch].added_rr):0);
get_routing_info(rpl, 0, &skip_rrs, &contact, &rr_set);
dlg_update_routing( dlg, leg, &rr_set, &contact );
if( rr_set.s )
pkg_free( rr_set.s);
}
}
static void dlg_onreply(struct cell* t, int type, struct tmcb_params *param)
{
struct sip_msg *rpl,*req;
struct dlg_cell *dlg;
int new_state;
int old_state;
int unref;
int event;
str mangled_from = {0,0};
str mangled_to = {0,0};
str *req_out_buff;
dlg = (struct dlg_cell *)(*param->param);
if (shutdown_done || dlg==0)
return;
rpl = param->rpl;
req = param->req;
if (type==TMCB_RESPONSE_FWDED) {
/* this callback is under transaction lock (by TM), so it is save
to operate at write level, but we need to take care on write-read
conflicts -bogdan */
if (rpl!=FAKED_REPLY) {
if (req->msg_flags & (FL_USE_UAC_FROM | FL_USE_UAC_TO ) ) {
req_out_buff = &t->uac[d_tmb.get_branch_index()].request.buffer;
if (extract_ftc_hdrs(req_out_buff->s,req_out_buff->len,
(req->msg_flags & FL_USE_UAC_FROM )?&mangled_from:0,
(req->msg_flags & FL_USE_UAC_TO )?&mangled_to:0,0,0) != 0) {
LM_ERR("failed to extract mangled FROM and TO hdrs\n");
mangled_from.len = 0;
mangled_from.s = NULL;
mangled_to.len = 0;
mangled_to.s = NULL;
} else {
if ((req->msg_flags & FL_USE_UAC_FROM) && (mangled_from.len == 0 || mangled_from.s == NULL))
LM_CRIT("extract_ftc_hdrs ok but no from extracted : [%.*s]\n",req_out_buff->len,req_out_buff->s);
if ((req->msg_flags & FL_USE_UAC_TO) && (mangled_to.len == 0 || mangled_to.s == NULL))
LM_CRIT("extract_ftc_hdrs ok but no to extracted : [%.*s]\n",req_out_buff->len,req_out_buff->s);
}
}
push_reply_in_dialog( rpl, t, dlg,&mangled_from,&mangled_to);
if((dlg->flags & DLG_FLAG_TOPHIDING) &&
dlg_th_onreply(dlg, rpl,req, 1, DLG_DIR_UPSTREAM) < 0)
LM_ERR("Failed to transform the reply for topology hiding\n");
} else {
LM_DBG("dialog replied from script - cannot get callee info\n");
}
/* The state does not change, but the msg is mutable in this callback*/
run_dlg_callbacks(DLGCB_RESPONSE_FWDED, dlg, rpl, DLG_DIR_UPSTREAM, 0);
return;
}
if (type==TMCB_TRANS_CANCELLED) {
/* only if we did force match the Cancel to the
* dialog before ( from the script ) */
if (current_dlg_pointer == NULL) {
/* reference and attached to script */
ref_dlg(dlg,1);
current_dlg_pointer = t->dialog_ctx;
}
return;
}
if (type==TMCB_TRANS_DELETED)
event = DLG_EVENT_TDEL;
else if (param->code<200)
event = DLG_EVENT_RPL1xx;
else if (param->code<300)
event = DLG_EVENT_RPL2xx;
else
event = DLG_EVENT_RPL3xx;
last_dst_leg = DLG_CALLER_LEG;
next_state_dlg(dlg, event, DLG_DIR_UPSTREAM, &old_state, &new_state,
&unref, 0);
if (new_state==DLG_STATE_EARLY && old_state!=DLG_STATE_EARLY) {
run_dlg_callbacks(DLGCB_EARLY, dlg, rpl, DLG_DIR_UPSTREAM, 0);
if_update_stat(dlg_enable_stats, early_dlgs, 1);
return;
}
if (new_state==DLG_STATE_CONFIRMED_NA &&
old_state!=DLG_STATE_CONFIRMED_NA && old_state!=DLG_STATE_CONFIRMED ) {
LM_DBG("dialog %p confirmed\n",dlg);
/* set start time */
dlg->start_ts = (unsigned int)(time(0));
if (0 != insert_dlg_timer( &dlg->tl, dlg->lifetime )) {
LM_CRIT("Unable to insert dlg %p [%u:%u] on event %d [%d->%d] "
"with clid '%.*s' and tags '%.*s' '%.*s'\n",
dlg, dlg->h_entry, dlg->h_id, event, old_state, new_state,
dlg->callid.len, dlg->callid.s,
dlg->legs[DLG_CALLER_LEG].tag.len,
dlg->legs[DLG_CALLER_LEG].tag.s,
dlg->legs[callee_idx(dlg)].tag.len,
ZSW(dlg->legs[callee_idx(dlg)].tag.s));
} else {
/* reference dialog as kept in timer list */
ref_dlg(dlg,1);
}
if (dlg->flags & DLG_FLAG_PING_CALLER || dlg->flags & DLG_FLAG_PING_CALLEE) {
if (0 != insert_ping_timer( dlg)) {
LM_CRIT("Unable to insert ping dlg %p [%u:%u] on event %d [%d->%d] "
"with clid '%.*s' and tags '%.*s' '%.*s'\n",
dlg, dlg->h_entry, dlg->h_id, event, old_state, new_state,
dlg->callid.len, dlg->callid.s,
dlg->legs[DLG_CALLER_LEG].tag.len,
dlg->legs[DLG_CALLER_LEG].tag.s,
dlg->legs[callee_idx(dlg)].tag.len,
ZSW(dlg->legs[callee_idx(dlg)].tag.s));
} else {
/* reference dialog as kept in ping timer list */
ref_dlg(dlg,1);
}
}
/* save the settings to the database,
* if realtime saving mode configured- save dialog now
* else: the next time the timer will fire the update*/
dlg->flags |= DLG_FLAG_NEW;
if ( dlg_db_mode==DB_MODE_REALTIME )
update_dialog_dbinfo(dlg);
/* dialog confirmed */
run_dlg_callbacks( DLGCB_CONFIRMED, dlg, rpl, DLG_DIR_UPSTREAM, 0);
if (replication_dests)
replicate_dialog_created(dlg);
if (old_state==DLG_STATE_EARLY)
if_update_stat(dlg_enable_stats, early_dlgs, -1);
if_update_stat(dlg_enable_stats, active_dlgs, 1);
return;
}
if ( old_state!=DLG_STATE_DELETED && new_state==DLG_STATE_DELETED ) {
LM_DBG("dialog %p failed (negative reply)\n", dlg);
/*destroy linkers */
dlg_lock_dlg(dlg);
destroy_linkers(dlg->profile_links, 0);
dlg->profile_links = NULL;
dlg_unlock_dlg(dlg);
/* dialog setup not completed (3456XX) */
run_dlg_callbacks( DLGCB_FAILED, dlg, rpl, DLG_DIR_UPSTREAM, 0);
/* do unref */
if (unref)
unref_dlg(dlg,unref);
if (old_state==DLG_STATE_EARLY)
if_update_stat(dlg_enable_stats, early_dlgs, -1);
if_update_stat(dlg_enable_stats, failed_dlgs, 1);
return;
}
/* in any other case, check if the dialog state machine
requests to unref the dialog */
if (unref)
unref_dlg(dlg,unref);
return;
}
/* modifies the sip_msg, setting the cseq header to
* new_cseq.s + value OR
* value if new_cseq is NULL
*/
static inline int update_msg_cseq(struct sip_msg *msg,str *new_cseq,
unsigned int value)
{
int offset,len;
struct lump *tmp;
char *buf;
unsigned int loc_cseq;
str final_cseq;
str pkg_cseq;
if (!msg)
{
LM_ERR("null pointer provided\n");
return -1;
}
if(parse_headers(msg, HDR_CSEQ_F, 0) <0 )
{
LM_ERR("failed to parse headers \n");
return -1;
}
if (new_cseq == 0 || new_cseq->s == 0 || new_cseq->len == 0)
{
LM_DBG("null str provided. Using only int value for cseq\n");
final_cseq.s = int2str(value,&final_cseq.len);
}
else
{
if( str2int(new_cseq, &loc_cseq) != 0){
LM_ERR("could not convert string cseq to number\n");
return -1;
}
loc_cseq += value;
final_cseq.s = int2str(loc_cseq,&final_cseq.len);
}
buf = msg->buf;
len = ((struct cseq_body *)msg->cseq->parsed)->number.len;
offset = ((struct cseq_body *)msg->cseq->parsed)->number.s - buf;
if ((tmp = del_lump(msg,offset,len,0)) == 0)
{
LM_ERR("failed to remove the existing CSEQ\n");
return -1;
}
/* Make pkg copy of cseq */
pkg_cseq.s = pkg_malloc(final_cseq.len);
if (pkg_cseq.s == 0)
{
LM_ERR("no more pkg mem\n");
return -1;
}
pkg_cseq.len = final_cseq.len;
memcpy(pkg_cseq.s,final_cseq.s,final_cseq.len);
LM_DBG("Message CSEQ translated from [%.*s] to [%.*s]\n",
((struct cseq_body *)msg->cseq->parsed)->number.len,
((struct cseq_body *)msg->cseq->parsed)->number.s,pkg_cseq.len,
pkg_cseq.s);
if (insert_new_lump_after(tmp,pkg_cseq.s,pkg_cseq.len,0) == 0)
{
LM_ERR("failed to insert new CSEQ\n");
pkg_free(pkg_cseq.s);
return -1;
}
return 0;
}
static void dlg_seq_up_onreply_mod_cseq(struct cell* t, int type,
struct tmcb_params *param)
{
struct dlg_cell *dlg;
dlg = ((dlg_cseq_wrapper*)*param->param)->dlg;
if (shutdown_done || dlg==0)
return;
if (update_msg_cseq((struct sip_msg *)param->rpl,&((dlg_cseq_wrapper *)*param->param)->cseq,0) != 0)
LM_ERR("failed to update CSEQ in msg\n");
if (type==TMCB_RESPONSE_FWDED &&
(dlg->cbs.types)&DLGCB_RESPONSE_WITHIN) {
run_dlg_callbacks(DLGCB_RESPONSE_WITHIN, dlg, param->rpl,
DLG_DIR_UPSTREAM, 0);
return;
}
return;
}
static void dlg_seq_up_onreply(struct cell* t, int type,
struct tmcb_params *param)
{
struct dlg_cell *dlg;
dlg = (struct dlg_cell *)(*param->param);
if (shutdown_done || dlg==0)
return;
if (type==TMCB_RESPONSE_FWDED &&
(dlg->cbs.types)&DLGCB_RESPONSE_WITHIN) {
run_dlg_callbacks(DLGCB_RESPONSE_WITHIN, dlg, param->rpl,
DLG_DIR_UPSTREAM, 0);
return;
}
return;
}
static void dlg_seq_down_onreply_mod_cseq(struct cell* t, int type,
struct tmcb_params *param)
{
struct dlg_cell *dlg;
dlg = ((dlg_cseq_wrapper*)*param->param)->dlg;
if (shutdown_done || dlg==0)
return;
if (update_msg_cseq((struct sip_msg *)param->rpl,&((dlg_cseq_wrapper *)*param->param)->cseq,0) != 0)
LM_ERR("failed to update CSEQ in msg\n");
if (type==TMCB_RESPONSE_FWDED &&
(dlg->cbs.types)&DLGCB_RESPONSE_WITHIN) {
run_dlg_callbacks(DLGCB_RESPONSE_WITHIN, dlg, param->rpl,
DLG_DIR_DOWNSTREAM, 0);
return;
}
return;
}
static void fix_final_cseq(struct cell *t,int type,
struct tmcb_params *param)
{
str cseq;
cseq.s = (char *)(*param->param);
cseq.len = strlen(cseq.s);
if (update_msg_cseq((struct sip_msg *)param->rpl,&cseq,0) != 0)
LM_ERR("failed to update CSEQ in msg\n");
shm_free(cseq.s);
return ;
}
static void dlg_seq_down_onreply(struct cell* t, int type,
struct tmcb_params *param)
{
struct dlg_cell *dlg;
dlg = (struct dlg_cell *)(*param->param);
if (shutdown_done || dlg==0)
return;
if (type==TMCB_RESPONSE_FWDED &&
(dlg->cbs.types)&DLGCB_RESPONSE_WITHIN) {
run_dlg_callbacks(DLGCB_RESPONSE_WITHIN, dlg, param->rpl,
DLG_DIR_DOWNSTREAM, 0);
return;
}
return;
}
inline static int get_dlg_timeout(struct sip_msg *req)
{
pv_value_t pv_val;
if( timeout_avp && pv_get_spec_value( req, timeout_avp, &pv_val)==0
&& pv_val.flags&PV_VAL_INT && pv_val.ri>0 ) {
return pv_val.ri;
}
LM_DBG("invalid AVP value, use default timeout\n");
return default_timeout;
}
inline static int get_dlg_timeout_update(struct sip_msg *req)
{
pv_value_t pv_val;
if( timeout_avp && pv_get_spec_value( req, timeout_avp, &pv_val)==0
&& pv_val.flags&PV_VAL_INT && pv_val.ri>0 ) {
return pv_val.ri;
}
return 0;
}
static void unreference_dialog_cseq(void *cseq_wrap)
{
/* if the dialog table is gone, it means the system is shutting down.*/
if (!d_table)
return;
dlg_cseq_wrapper *wrap = (dlg_cseq_wrapper *)cseq_wrap;
unref_dlg(wrap->dlg, 1);
shm_free(wrap);
}
void unreference_dialog(void *dialog)
{
/* if the dialog table is gone, it means the system is shutting down.*/
if (!d_table)
return;
unref_dlg((struct dlg_cell*)dialog, 1);
}
static void unreference_dialog_create(void *dialog)
{
struct tmcb_params params;
memset(¶ms, 0, sizeof(struct tmcb_params));
params.param = (void*)&dialog;
/* just a wapper */
dlg_onreply( 0, TMCB_TRANS_DELETED, ¶ms);
}
static void tmcb_unreference_dialog(struct cell* t, int type,
struct tmcb_params *param)
{
if (d_table)
unref_dlg((struct dlg_cell*)*param->param, 1);
}
void dlg_onreq(struct cell* t, int type, struct tmcb_params *param)
{
/* is the dialog already created? */
if (current_dlg_pointer!=NULL) {
/* new, un-initialized dialog ? */
if ( current_dlg_pointer->flags & DLG_FLAG_ISINIT ) {
/* fully init dialog -> check if attached to the transaction */
if (t->dialog_ctx==NULL) {
/* set a callback to remove the ref when transaction
* is destroied */
if ( d_tmb.register_tmcb( NULL, t, TMCB_TRANS_DELETED,
tmcb_unreference_dialog, (void*)current_dlg_pointer, NULL)<0){
LM_ERR("failed to register TMCB\n");
return;
}
/* and attached the dialog to the transaction */
t->dialog_ctx = (void*)current_dlg_pointer;
/* and keep a reference on it */
ref_dlg( current_dlg_pointer , 1);
}
return;
}
/* dialog was previously created by create_dialog()
-> just do the last settings */
run_create_callbacks( current_dlg_pointer, param->req);
LM_DBG("t hash_index = %u, t label = %u\n",t->hash_index,t->label);
current_dlg_pointer->initial_t_hash_index = t->hash_index;
current_dlg_pointer->initial_t_label = t->label;
current_dlg_pointer->lifetime = get_dlg_timeout(param->req);
t->dialog_ctx = (void*)current_dlg_pointer;
/* dialog is fully initialized */
current_dlg_pointer->flags |= DLG_FLAG_ISINIT;
}
}
int dlg_create_dialog(struct cell* t, struct sip_msg *req,unsigned int flags)
{
struct dlg_cell *dlg;
str s;
int extra_ref;
/* module is stricly designed for dialog calls */
if (req->first_line.u.request.method_value!=METHOD_INVITE)
return -1;
if ( (!req->to && parse_headers(req, HDR_TO_F,0)<0) || !req->to ) {
LM_ERR("bad request or missing TO hdr :-/\n");
return -1;
}
s = get_to(req)->tag_value;
if (s.s!=0 && s.len!=0)
return -1;
if ( parse_from_header(req)) {
LM_ERR("bad request or missing FROM hdr :-/\n");
return -1;
}
if ((!req->callid && parse_headers(req,HDR_CALLID_F,0)<0) || !req->callid){
LM_ERR("bad request or missing CALLID hdr :-/\n");
return -1;
}
s = req->callid->body;
trim(&s);
/* some sanity checks */
if (s.len==0 || get_from(req)->tag_value.len==0) {
LM_ERR("invalid request -> callid (%d) or from TAG (%d) empty\n",
s.len, get_from(req)->tag_value.len);
return -1;
}
dlg = build_new_dlg( &s /*callid*/, &(get_from(req)->uri) /*from uri*/,
&(get_to(req)->uri) /*to uri*/,
&(get_from(req)->tag_value)/*from_tag*/ );
if (dlg==0) {
LM_ERR("failed to create new dialog\n");
return -1;
}
dlg->flags |= flags;
/* save caller's tag, cseq, contact and record route*/
if (init_leg_info(dlg, req, t, &(get_from(req)->tag_value),NULL,NULL ) !=0) {
LM_ERR("could not add further info to the dialog\n");
shm_free(dlg);
return -1;
}
/* set current dialog */
set_current_dialog(dlg);
last_dst_leg = DLG_FIRST_CALLEE_LEG;
extra_ref=2; /* extra ref for the callback and current dlg hook */
if (dlg_db_mode == DB_MODE_DELAYED)
extra_ref++; /* extra ref for the timer to delete the dialog */
link_dlg( dlg , extra_ref);
if ( seq_match_mode!=SEQ_MATCH_NO_ID &&
add_dlg_rr_param( req, dlg->h_entry, dlg->h_id)<0 ) {
LM_ERR("failed to add RR param\n");
goto error;
}
if ( d_tmb.register_tmcb( req, t,
TMCB_RESPONSE_PRE_OUT|TMCB_RESPONSE_FWDED|TMCB_TRANS_CANCELLED,
dlg_onreply, (void*)dlg, unreference_dialog_create)<0 ) {
LM_ERR("failed to register TMCB\n");
goto error;
}
/* complete the dialog setup only if transaction aleady exists;
if not, wait for the TMCB_REQUEST_IN callback to do this job */
if (t) {
/* first INVITE seen (dialog created, unconfirmed) */
run_create_callbacks( dlg, req);
LM_DBG("t hash_index = %u, t label = %u\n",t->hash_index,t->label);
dlg->initial_t_hash_index = t->hash_index;
dlg->initial_t_label = t->label;
dlg->lifetime = get_dlg_timeout(req);
t->dialog_ctx = (void*) dlg;
dlg->flags |= DLG_FLAG_ISINIT;
}
if_update_stat( dlg_enable_stats, processed_dlgs, 1);
return 0;
error:
unref_dlg(dlg,2);
dialog_cleanup( req, NULL);
if_update_stat(dlg_enable_stats, failed_dlgs, 1);
return -1;
}
/* update inv_cseq field if update_field=1
* else update r_cseq */
static inline int update_cseqs(struct dlg_cell *dlg, struct sip_msg *req,
unsigned int leg, int update_field)
{
if ( (!req->cseq && parse_headers(req,HDR_CSEQ_F,0)<0) || !req->cseq ||
!req->cseq->parsed) {
LM_ERR("bad sip message or missing CSeq hdr :-/\n");
return -1;
}
return dlg_update_cseq(dlg, leg, &((get_cseq(req))->number),update_field);
}
/* move r_cseq to prev_cseq in leg */
static inline int switch_cseqs(struct dlg_cell *dlg,unsigned int leg_no)
{
str* r_cseq,*prev_cseq;
r_cseq = &dlg->legs[leg_no].r_cseq;
prev_cseq = &dlg->legs[leg_no].prev_cseq;
if ( prev_cseq->s ) {
if (prev_cseq->len < r_cseq->len) {
prev_cseq->s = (char*)shm_realloc(prev_cseq->s,r_cseq->len);
if (prev_cseq->s==NULL) {
LM_ERR("no more shm mem for realloc (%d)\n",r_cseq->len);
return -1;
}
}
} else {
prev_cseq->s = (char*)shm_malloc(r_cseq->len);
if (prev_cseq->s==NULL) {
LM_ERR("no more shm mem for malloc (%d)\n",r_cseq->len);
return -1;
}
}
memcpy( prev_cseq->s, r_cseq->s, r_cseq->len );
prev_cseq->len = r_cseq->len;
LM_DBG("prev_cseq = %.*s for leg %d\n",prev_cseq->len,prev_cseq->s,leg_no);
return 0;
}
static inline void log_bogus_dst_leg(struct dlg_cell *dlg)
{
if (last_dst_leg>=dlg->legs_no[DLG_LEGS_USED])
LM_CRIT("bogus dst leg %d in state %d for dlg %p [%u:%u] with "