/*!
* \brief Function that is registered as TM callback and called on requests
* \see dlg_new_dialog
* \param t transaction, used to created the dialog
* \param type type of the entered callback
* \param param saved dialog structure in the callback
*/
void dlg_onreq(struct cell* t, int type, struct tmcb_params *param)
{
sip_msg_t *req = param->req;
dlg_cell_t *dlg = NULL;
if(req->first_line.u.request.method_value != METHOD_INVITE)
return;
dlg = dlg_get_ctx_dialog();
if (dlg!=NULL) {
if (!initial_cbs_inscript) {
if (spiral_detected == 1)
run_dlg_callbacks( DLGCB_SPIRALED, dlg,
req, NULL, DLG_DIR_DOWNSTREAM, 0);
else if (spiral_detected == 0)
run_create_callbacks(dlg, req);
}
}
if (dlg==NULL) {
if((req->flags&dlg_flag)!=dlg_flag)
return;
dlg_new_dialog(req, t, 1);
dlg = dlg_get_ctx_dialog();
}
if (dlg!=NULL) {
dlg_set_tm_callbacks(t, req, dlg, spiral_detected);
dlg_release(dlg);
}
}
static int w_dlg_bye(struct sip_msg *msg, char *side, char *s2)
{
dlg_cell_t *dlg = NULL;
int n;
dlg = dlg_get_ctx_dialog();
if(dlg==NULL)
return -1;
n = (int)(long)side;
if(n==1)
{
if(dlg_bye(dlg, NULL, DLG_CALLER_LEG)!=0)
goto error;
goto done;
} else if(n==2) {
if(dlg_bye(dlg, NULL, DLG_CALLEE_LEG)!=0)
goto error;
goto done;
} else {
if(dlg_bye_all(dlg, NULL)!=0)
goto error;
goto done;
}
done:
dlg_release(dlg);
return 1;
error:
dlg_release(dlg);
return -1;
}
int dlg_cfg_cb(sip_msg_t *msg, unsigned int flags, void *cbp)
{
dlg_cell_t *dlg;
if(flags&POST_SCRIPT_CB) {
dlg = dlg_get_ctx_dialog();
if(dlg!=NULL) {
if(_dlg_ctx.t==0 && (dlg->state==DLG_STATE_UNCONFIRMED
|| _dlg_ctx.expect_t==1)) {
if(_dlg_ctx.cpid!=0 && _dlg_ctx.cpid==my_pid()) {
/* release to destroy dialog if created by this process
* and request was not forwarded */
if(dlg->state==DLG_STATE_UNCONFIRMED) {
LM_DBG("new dialog with no transaction after config"
" execution\n");
} else {
LM_DBG("dialog with no expected transaction after"
" config execution\n");
}
dlg_release(dlg);
}
}
/* get ctx dlg increased ref count - release now */
dlg_release(dlg);
}
}
memset(&_dlg_ctx, 0, sizeof(dlg_ctx_t));
return 1;
}
int dlg_manage(sip_msg_t *msg)
{
str tag;
int backup_mode;
dlg_cell_t *dlg = NULL;
tm_cell_t *t = NULL;
if( (msg->to==NULL && parse_headers(msg, HDR_TO_F,0)<0) || msg->to==NULL )
{
LM_ERR("bad TO header\n");
return -1;
}
tag = get_to(msg)->tag_value;
if(tag.s!=0 && tag.len!=0)
{
backup_mode = seq_match_mode;
seq_match_mode = SEQ_MATCH_NO_ID;
dlg_onroute(msg, NULL, NULL);
seq_match_mode = backup_mode;
} else {
t = d_tmb.t_gett();
if(t==T_UNDEFINED)
t = NULL;
if(dlg_new_dialog(msg, t, initial_cbs_inscript)!=0)
return -1;
dlg = dlg_get_ctx_dialog();
if(dlg==NULL)
return -1;
if(t!=NULL)
dlg_set_tm_callbacks(t, msg, dlg, spiral_detected);
dlg_release(dlg);
}
return 1;
}
/*!
* \brief Cleanup a profile
* \param msg SIP message
* \param flags unused
* \param param unused
* \return 1
*/
int profile_cleanup( struct sip_msg *msg, unsigned int flags, void *param )
{
dlg_cell_t *dlg;
if(get_route_type()==LOCAL_ROUTE) {
return 1;
}
current_dlg_msg_id = 0;
current_dlg_msg_pid = 0;
dlg = dlg_get_ctx_dialog();
if (dlg!=NULL) {
if(dlg->dflags & DLG_FLAG_TM) {
dlg_unref(dlg, 1);
} else {
/* dialog didn't make it to tm */
dlg_unref(dlg, 2);
}
}
if (current_pending_linkers) {
destroy_linkers(current_pending_linkers);
current_pending_linkers = NULL;
}
/* need to return non-zero - 0 will break the exec of the request */
return 1;
}
/*!
*
*/
dlg_cell_t *dlg_lookup_msg_dialog(sip_msg_t *msg, unsigned int *dir)
{
dlg_cell_t *dlg = NULL;
str callid;
str ftag;
str ttag;
unsigned int vdir;
/* Retrieve the current dialog */
dlg = dlg_get_ctx_dialog();
if(dlg!=NULL) {
if(dir) {
if (pre_match_parse(msg, &callid, &ftag, &ttag, 0)<0) {
dlg_release(dlg);
return NULL;
}
if (dlg->tag[DLG_CALLER_LEG].len == ftag.len &&
strncmp(dlg->tag[DLG_CALLER_LEG].s, ftag.s, ftag.len)==0 &&
strncmp(dlg->callid.s, callid.s, callid.len)==0) {
*dir = DLG_DIR_DOWNSTREAM;
} else {
if (ttag.len>0 && dlg->tag[DLG_CALLER_LEG].len == ttag.len &&
strncmp(dlg->tag[DLG_CALLER_LEG].s, ttag.s, ttag.len)==0 &&
strncmp(dlg->callid.s, callid.s, callid.len)==0) {
*dir = DLG_DIR_UPSTREAM;
}
}
}
return dlg;
}
if (pre_match_parse(msg, &callid, &ftag, &ttag, 0)<0)
return NULL;
vdir = DLG_DIR_NONE;
dlg = get_dlg(&callid, &ftag, &ttag, &vdir);
if (dlg==NULL){
LM_DBG("dlg with callid '%.*s' not found\n",
msg->callid->body.len, msg->callid->body.s);
return NULL;
}
if(dir) *dir = vdir;
return dlg;
}
static int w_dlg_refer(struct sip_msg *msg, char *side, char *to)
{
dlg_cell_t *dlg;
int n;
str st = {0,0};
dlg = dlg_get_ctx_dialog();
if(dlg==NULL)
return -1;
n = (int)(long)side;
if(fixup_get_svalue(msg, (gparam_p)to, &st)!=0)
{
LM_ERR("unable to get To\n");
goto error;
}
if(st.s==NULL || st.len == 0)
{
LM_ERR("invalid To parameter\n");
goto error;
}
if(n==1)
{
if(dlg_transfer(dlg, &st, DLG_CALLER_LEG)!=0)
goto error;
} else {
if(dlg_transfer(dlg, &st, DLG_CALLEE_LEG)!=0)
goto error;
}
dlg_release(dlg);
return 1;
error:
dlg_release(dlg);
return -1;
}
struct dlg_cell *dlg_get_msg_dialog(sip_msg_t *msg)
{
struct dlg_cell *dlg = NULL;
str callid;
str ftag;
str ttag;
unsigned int dir;
/* Retrieve the current dialog */
dlg = dlg_get_ctx_dialog();
if (dlg != NULL )
return dlg;
if (pre_match_parse(msg, &callid, &ftag, &ttag, 0) < 0)
return NULL ;
dir = DLG_DIR_NONE;
dlg = get_dlg(&callid, &ftag, &ttag, &dir);
if (dlg == NULL ) {
LM_DBG("dlg with callid '%.*s' not found\n",
msg->callid->body.len, msg->callid->body.s);
return NULL ;
}
return dlg;
}
/*!
* \brief Create a new dialog from a sip message
*
* Create a new dialog from a SIP message, register a callback
* to keep track of the dialog with help of the tm module.
* This function is either called from the request callback, or
* from the dlg_manage function in the configuration script.
* \see dlg_onreq
* \see w_dlg_manage
* \param req SIP message
* \param t transaction
* \param run_initial_cbs if set zero, initial callbacks are not executed
* \return 0 on success, -1 on failure
*/
int dlg_new_dialog(sip_msg_t *req, struct cell *t, const int run_initial_cbs)
{
dlg_cell_t *dlg;
str s;
str callid;
str ftag;
str ttag;
str req_uri;
unsigned int dir;
dlg = dlg_get_ctx_dialog();
if(dlg != NULL) {
dlg_release(dlg);
return -1;
}
if(req->first_line.u.request.method_value != METHOD_INVITE)
return -1;
if(pre_match_parse( req, &callid, &ftag, &ttag, 0)<0) {
LM_WARN("pre-matching failed\n");
return -1;
}
if(ttag.s!=0 && ttag.len!=0)
return -1;
if(pv_printf_s(req, ruri_param_model, &req_uri)<0) {
LM_ERR("error - cannot print the r-uri format\n");
return -1;
}
trim(&req_uri);
dir = DLG_DIR_NONE;
/* search dialog by SIP attributes
* - hash table slot is left locked */
dlg = dlg_search(&callid, &ftag, &ttag, &dir);
if(dlg) {
if (detect_spirals) {
if (spiral_detected == 1) {
dlg_hash_release(&callid);
return 0;
}
if ( dlg->state != DLG_STATE_DELETED ) {
LM_DBG("Callid '%.*s' found, must be a spiraled request\n",
callid.len, callid.s);
spiral_detected = 1;
if (run_initial_cbs)
run_dlg_callbacks( DLGCB_SPIRALED, dlg, req, NULL,
DLG_DIR_DOWNSTREAM, 0);
/* set ctx dlg id shortcuts */
_dlg_ctx.iuid.h_entry = dlg->h_entry;
_dlg_ctx.iuid.h_id = dlg->h_id;
/* search_dlg() has incremented the ref count by 1 */
dlg_release(dlg);
dlg_hash_release(&callid);
return 0;
}
dlg_release(dlg);
}
}
spiral_detected = 0;
dlg = build_new_dlg (&callid /*callid*/,
&(get_from(req)->uri) /*from uri*/,
&(get_to(req)->uri) /*to uri*/,
&ftag/*from_tag*/,
&req_uri /*r-uri*/ );
if (dlg==0) {
dlg_hash_release(&callid);
LM_ERR("failed to create new dialog\n");
return -1;
}
/* save caller's tag, cseq, contact and record route*/
if (populate_leg_info(dlg, req, t, DLG_CALLER_LEG,
&(get_from(req)->tag_value)) !=0) {
dlg_hash_release(&callid);
LM_ERR("could not add further info to the dialog\n");
shm_free(dlg);
return -1;
}
/* Populate initial varlist: */
dlg->vars = get_local_varlist_pointer(req, 1);
/* after dlg_search() slot was kept locked */
link_dlg(dlg, 0, 1);
/* unlock after dlg_search() */
dlg_hash_release(&callid);
dlg->lifetime = get_dlg_timeout(req);
s.s = _dlg_ctx.to_route_name;
s.len = strlen(s.s);
dlg_set_toroute(dlg, &s);
dlg->sflags |= _dlg_ctx.flags;
dlg->iflags |= _dlg_ctx.iflags;
if (dlg_send_bye!=0 || _dlg_ctx.to_bye!=0)
dlg->iflags |= DLG_IFLAG_TIMEOUTBYE;
if (run_initial_cbs) run_create_callbacks( dlg, req);
/* first INVITE seen (dialog created, unconfirmed) */
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_update_stat( dlg_enable_stats, processed_dlgs, 1);
_dlg_ctx.cpid = my_pid();
_dlg_ctx.iuid.h_entry = dlg->h_entry;
_dlg_ctx.iuid.h_id = dlg->h_id;
set_current_dialog(req, dlg);
return 0;
error:
if (!spiral_detected)
dlg_unref(dlg, 1); // undo ref regarding linking
return -1;
}
/*!
* \brief Function that is registered as RR callback for dialog tracking
*
* Function that is registered as RR callback for dialog tracking. It
* sets the appropriate events after the SIP method and run the state
* machine to update the dialog state. It updates then the saved
* dialogs and also the statistics.
* \param req SIP request
* \param route_params record-route parameter
* \param param unused
*/
void dlg_onroute(struct sip_msg* req, str *route_params, void *param)
{
dlg_cell_t *dlg;
dlg_iuid_t *iuid;
str val, callid, ftag, ttag;
int h_entry, h_id, new_state, old_state, unref, event, timeout, reset;
unsigned int dir;
int ret = 0;
dlg = dlg_get_ctx_dialog();
if (dlg!=NULL) {
dlg_release(dlg);
return;
}
/* skip initial requests - they may end up here because of the
* preloaded route */
if ( (!req->to && parse_headers(req, HDR_TO_F,0)<0) || !req->to ) {
LM_ERR("bad request or missing TO hdr :-/\n");
return;
}
if ( get_to(req)->tag_value.len==0 )
return;
dlg = 0;
dir = DLG_DIR_NONE;
if ( seq_match_mode!=SEQ_MATCH_NO_ID ) {
if( d_rrb.get_route_param( req, &rr_param, &val)!=0) {
LM_DBG("Route param '%.*s' not found\n", rr_param.len,rr_param.s);
if (seq_match_mode==SEQ_MATCH_STRICT_ID )
return;
} else {
LM_DBG("route param is '%.*s' (len=%d)\n",val.len,val.s,val.len);
if ( parse_dlg_rr_param( val.s, val.s+val.len, &h_entry, &h_id)<0 )
return;
dlg = dlg_lookup(h_entry, h_id);
if (dlg==0) {
LM_WARN("unable to find dialog for %.*s "
"with route param '%.*s' [%u:%u]\n",
req->first_line.u.request.method.len,
req->first_line.u.request.method.s,
val.len,val.s, h_entry, h_id);
if (seq_match_mode==SEQ_MATCH_STRICT_ID )
return;
} else {
if (pre_match_parse( req, &callid, &ftag, &ttag, 1)<0) {
// lookup_dlg has incremented the ref count by 1
dlg_release(dlg);
return;
}
if (match_dialog( dlg, &callid, &ftag, &ttag, &dir )==0) {
LM_WARN("tight matching failed for %.*s with callid='%.*s'/%d, "
"ftag='%.*s'/%d, ttag='%.*s'/%d and direction=%d\n",
req->first_line.u.request.method.len,
req->first_line.u.request.method.s,
callid.len, callid.s, callid.len,
ftag.len, ftag.s, ftag.len,
ttag.len, ttag.s, ttag.len, dir);
LM_WARN("dialog identification elements are callid='%.*s'/%d, "
"caller tag='%.*s'/%d, callee tag='%.*s'/%d\n",
dlg->callid.len, dlg->callid.s, dlg->callid.len,
dlg->tag[DLG_CALLER_LEG].len, dlg->tag[DLG_CALLER_LEG].s,
dlg->tag[DLG_CALLER_LEG].len,
dlg->tag[DLG_CALLEE_LEG].len, dlg->tag[DLG_CALLEE_LEG].s,
dlg->tag[DLG_CALLEE_LEG].len);
// lookup_dlg has incremented the ref count by 1
dlg_release(dlg);
// Reset variables in order to do a lookup based on SIP-Elements.
dlg = 0;
dir = DLG_DIR_NONE;
if (seq_match_mode==SEQ_MATCH_STRICT_ID )
return;
}
}
}
}
if (dlg==0) {
if (pre_match_parse( req, &callid, &ftag, &ttag, 1)<0)
return;
/* TODO - try to use the RR dir detection to speed up here the
* search -bogdan */
dlg = get_dlg(&callid, &ftag, &ttag, &dir);
if (dlg==0){
LM_DBG("Callid '%.*s' not found\n",
req->callid->body.len, req->callid->body.s);
return;
}
}
/* set current dialog - re-use ref increment from dlg_get() above */
set_current_dialog( req, dlg);
_dlg_ctx.iuid.h_entry = dlg->h_entry;
_dlg_ctx.iuid.h_id = dlg->h_id;
if (req->first_line.u.request.method_value != METHOD_ACK) {
iuid = dlg_get_iuid_shm_clone(dlg);
if(iuid!=NULL)
{
/* register callback for the replies of this request */
if ( d_tmb.register_tmcb( req, 0, TMCB_RESPONSE_IN|TMCB_ON_FAILURE,
dlg_onreply, (void*)iuid, dlg_iuid_sfree)<0 ) {
LM_ERR("failed to register TMCB (3)\n");
shm_free(iuid);
}
iuid = NULL;
}
}
/* run state machine */
switch ( req->first_line.u.request.method_value ) {
case METHOD_PRACK:
event = DLG_EVENT_REQPRACK; break;
case METHOD_ACK:
event = DLG_EVENT_REQACK; break;
case METHOD_BYE:
event = DLG_EVENT_REQBYE; break;
default:
event = DLG_EVENT_REQ;
}
next_state_dlg( dlg, event, &old_state, &new_state, &unref);
CURR_DLG_ID = req->id;
CURR_DLG_LIFETIME = (unsigned int)(time(0))-dlg->start_ts;
CURR_DLG_STATUS = new_state;
dlg_run_event_route(dlg, req, old_state, new_state);
/* delay deletion of dialog until transaction has died off in order
* to absorb in-air messages */
if (new_state==DLG_STATE_DELETED && old_state!=DLG_STATE_DELETED) {
iuid = dlg_get_iuid_shm_clone(dlg);
if(iuid!=NULL) {
if ( d_tmb.register_tmcb(req, NULL, TMCB_DESTROY,
unref_dlg_from_cb, (void*)iuid, dlg_iuid_sfree)<0 ) {
LM_ERR("failed to register deletion delay function\n");
shm_free(iuid);
} else {
dlg_ref(dlg, 1);
}
}
}
if (new_state==DLG_STATE_CONFIRMED && old_state!=DLG_STATE_CONFIRMED)
dlg_ka_add(dlg);
/* run actions for the transition */
if (event==DLG_EVENT_REQBYE && new_state==DLG_STATE_DELETED &&
old_state!=DLG_STATE_DELETED) {
LM_DBG("BYE successfully processed\n");
/* remove from timer */
ret = remove_dialog_timer(&dlg->tl);
if (ret < 0) {
LM_CRIT("unable to unlink the timer on dlg %p [%u:%u] "
"with clid '%.*s' and tags '%.*s' '%.*s'\n",
dlg, dlg->h_entry, dlg->h_id,
dlg->callid.len, dlg->callid.s,
dlg->tag[DLG_CALLER_LEG].len, dlg->tag[DLG_CALLER_LEG].s,
dlg->tag[DLG_CALLEE_LEG].len, dlg->tag[DLG_CALLEE_LEG].s);
} else if (ret > 0) {
LM_WARN("inconsitent dlg timer data on dlg %p [%u:%u] "
"with clid '%.*s' and tags '%.*s' '%.*s'\n",
dlg, dlg->h_entry, dlg->h_id,
dlg->callid.len, dlg->callid.s,
dlg->tag[DLG_CALLER_LEG].len, dlg->tag[DLG_CALLER_LEG].s,
dlg->tag[DLG_CALLEE_LEG].len, dlg->tag[DLG_CALLEE_LEG].s);
} else {
/* one extra unref due to removal from timer list */
unref++;
}
/* dialog terminated (BYE) */
dlg_terminated( req, dlg, dir);
dlg_unref(dlg, unref);
_dlg_ctx.cpid = my_pid();
_dlg_ctx.expect_t = 1;
dlg_set_ctx_iuid(dlg);
if_update_stat( dlg_enable_stats, active_dlgs, -1);
goto done;
}
if ( (event==DLG_EVENT_REQ || event==DLG_EVENT_REQACK)
&& (new_state==DLG_STATE_CONFIRMED || new_state==DLG_STATE_EARLY)) {
timeout = get_dlg_timeout(req);
if (timeout!=default_timeout) {
dlg->lifetime = timeout;
}
reset = !((dlg->iflags & DLG_IFLAG_TIMER_NORESET) || dlg_timeout_noreset);
if ((new_state!=DLG_STATE_EARLY) && (old_state!=DLG_STATE_CONFIRMED || reset)) {
if (update_dlg_timer( &dlg->tl, dlg->lifetime )==-1) {
LM_ERR("failed to update dialog lifetime\n");
} else {
dlg->dflags |= DLG_FLAG_CHANGED;
}
}
if(event != DLG_EVENT_REQACK) {
if(dlg_refresh_contacts(dlg, req, dir)!=0) {
LM_ERR("contacts update failed\n");
} else {
dlg->dflags |= DLG_FLAG_CHANGED;
}
if(update_cseqs(dlg, req, dir)!=0) {
LM_ERR("cseqs update failed\n");
} else {
dlg->dflags |= DLG_FLAG_CHANGED;
}
}
if(dlg_db_mode==DB_MODE_REALTIME && (dlg->dflags&DLG_FLAG_CHANGED)) {
update_dialog_dbinfo(dlg);
}
if (old_state==DLG_STATE_CONFIRMED_NA) {
LM_DBG("confirming ACK successfully processed\n");
/* confirming ACK request */
run_dlg_callbacks( DLGCB_CONFIRMED, dlg, req, NULL, dir, 0);
} else {
LM_DBG("sequential request successfully processed\n");
/* within dialog request */
run_dlg_callbacks( DLGCB_REQ_WITHIN, dlg, req, NULL, dir, 0);
if ( (event!=DLG_EVENT_REQACK) &&
(dlg->cbs.types)&DLGCB_RESPONSE_WITHIN ) {
iuid = dlg_get_iuid_shm_clone(dlg);
if(iuid!=NULL)
{
/* register callback for the replies of this request */
if ( d_tmb.register_tmcb( req, 0, TMCB_RESPONSE_FWDED,
(dir==DLG_DIR_UPSTREAM)?dlg_seq_down_onreply:
dlg_seq_up_onreply,
(void*)iuid, dlg_iuid_sfree)<0 ) {
LM_ERR("failed to register TMCB (2)\n");
shm_free(iuid);
}
}
}
}
}
if(new_state==DLG_STATE_CONFIRMED && old_state==DLG_STATE_CONFIRMED_NA){
dlg->dflags |= DLG_FLAG_CHANGED;
if(dlg_db_mode == DB_MODE_REALTIME)
update_dialog_dbinfo(dlg);
}
done:
dlg_release(dlg);
return;
}