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315 lines
8.6 KiB
315 lines
8.6 KiB
/*
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* $Id$
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*
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* Copyright (C) 2008 iptelorg GmbH
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*
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* This file is part of ser, a free SIP server.
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*
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* ser is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version
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*
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* For a license to use the ser software under conditions
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* other than those described here, or to purchase support for this
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* software, please contact iptel.org by e-mail at the following addresses:
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* info@iptel.org
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*
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* ser is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* History:
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* --------
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* 2008-11-10 Initial version (Miklos)
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* 2009-06-01 Pre- and post-script callbacks of failure route are executed (Miklos)
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*
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*/
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#include "../../action.h"
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#include "../../script_cb.h"
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#include "config.h"
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#include "sip_msg.h"
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#include "t_reply.h"
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#include "h_table.h"
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#include "t_lookup.h"
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#include "t_fwd.h"
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#include "t_funcs.h"
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#include "timer.h"
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#include "t_suspend.h"
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/* Suspends the transaction for later use.
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* Save the returned hash_index and label to get
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* back to the SIP request processing, see the readme.
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*
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* Return value:
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* 0 - success
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* <0 - failure
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*/
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int t_suspend(struct sip_msg *msg,
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unsigned int *hash_index, unsigned int *label)
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{
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struct cell *t;
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t = get_t();
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if (!t || t == T_UNDEFINED) {
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LOG(L_ERR, "ERROR: t_suspend: " \
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"transaction has not been created yet\n");
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return -1;
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}
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if (t->flags & T_CANCELED) {
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/* The transaction has already been canceled */
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LOG(L_DBG, "DEBUG: t_suspend: " \
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"trying to suspend an already canceled transaction\n");
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ser_error = E_CANCELED;
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return 1;
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}
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/* send a 100 Trying reply, because the INVITE processing
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will probably take a long time */
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if (msg->REQ_METHOD==METHOD_INVITE && (t->flags&T_AUTO_INV_100)
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&& (t->uas.status < 100)
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) {
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if (!t_reply( t, msg , 100 ,
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cfg_get(tm, tm_cfg, tm_auto_inv_100_r)))
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DBG("SER: ERROR: t_suspend (100)\n");
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}
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if ((t->nr_of_outgoings==0) && /* if there had already been
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an UAC created, then the lumps were
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saved as well */
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save_msg_lumps(t->uas.request, msg)
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) {
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LOG(L_ERR, "ERROR: t_suspend: " \
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"failed to save the message lumps\n");
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return -1;
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}
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/* save the message flags */
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t->uas.request->flags = msg->flags;
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*hash_index = t->hash_index;
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*label = t->label;
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/* add a bling UAC to let the fr timer running */
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if (add_blind_uac() < 0) {
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LOG(L_ERR, "ERROR: t_suspend: " \
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"failed to add the blind UAC\n");
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return -1;
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}
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return 0;
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}
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/* Continues the SIP request processing previously saved by
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* t_suspend(). The script does not continue from the same
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* point, but a separate route block is executed instead.
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*
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* Return value:
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* 0 - success
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* <0 - failure
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*/
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int t_continue(unsigned int hash_index, unsigned int label,
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struct action *route)
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{
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struct cell *t;
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struct sip_msg faked_req;
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int branch;
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struct ua_client *uac =NULL;
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int ret;
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if (t_lookup_ident(&t, hash_index, label) < 0) {
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LOG(L_ERR, "ERROR: t_continue: transaction not found\n");
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return -1;
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}
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if (t->flags & T_CANCELED) {
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/* The transaction has already been canceled,
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* needless to continue */
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UNREF(t); /* t_unref would kill the transaction */
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/* reset T as we have no working T anymore */
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set_t(T_UNDEFINED, T_BR_UNDEFINED);
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return 1;
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}
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/* The transaction has to be locked to protect it
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* form calling t_continue() multiple times simultaneously */
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LOCK_REPLIES(t);
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/* Try to find the blind UAC, and cancel its fr timer.
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* We assume that the last blind uac called t_continue(). */
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for ( branch = t->nr_of_outgoings-1;
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branch >= 0 && t->uac[branch].request.buffer;
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branch--);
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if (branch >= 0) {
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stop_rb_timers(&t->uac[branch].request);
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if (t->uac[branch].last_received != 0) {
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/* Either t_continue() has already been
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* called or the branch has already timed out.
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* Needless to continue. */
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UNLOCK_REPLIES(t);
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UNREF(t); /* t_unref would kill the transaction */
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return 1;
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}
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/* Set last_received to something >= 200,
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* the actual value does not matter, the branch
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* will never be picked up for response forwarding.
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* If last_received is lower than 200,
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* then the branch may tried to be cancelled later,
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* for example when t_reply() is called from
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* a failure route => deadlock, because both
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* of them need the reply lock to be held. */
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t->uac[branch].last_received=500;
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uac = &t->uac[branch];
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}
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/* else
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Not a huge problem, fr timer will fire, but CANCEL
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will not be sent. last_received will be set to 408. */
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reset_kr();
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/* fake the request and the environment, like in failure_route */
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if (!fake_req(&faked_req, t->uas.request, 0 /* extra flags */, uac)) {
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LOG(L_ERR, "ERROR: t_continue: fake_req failed\n");
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ret = -1;
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goto kill_trans;
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}
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faked_env( t, &faked_req);
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/* The sip msg is a faked msg just like in failure route
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* therefore execute the pre- and post-script callbacks
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* of failure route (Miklos)
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*/
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if (exec_pre_script_cb(&faked_req, FAILURE_CB_TYPE)>0) {
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if (run_top_route(route, &faked_req, 0)<0)
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LOG(L_ERR, "ERROR: t_continue: Error in run_top_route\n");
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exec_post_script_cb(&faked_req, FAILURE_CB_TYPE);
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}
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/* TODO: save_msg_lumps should clone the lumps to shm mem */
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/* restore original environment and free the fake msg */
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faked_env( t, 0);
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free_faked_req(&faked_req, t);
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/* update the flags */
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t->uas.request->flags = faked_req.flags;
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if (t->uas.status < 200) {
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/* No final reply has been sent yet.
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* Check whether or not there is any pending branch.
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*/
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for ( branch = 0;
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branch < t->nr_of_outgoings;
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branch++
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) {
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if (t->uac[branch].last_received < 200)
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break;
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}
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if (branch == t->nr_of_outgoings) {
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/* There is not any open branch so there is
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* no chance that a final response will be received. */
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ret = 0;
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goto kill_trans;
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}
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}
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UNLOCK_REPLIES(t);
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/* unref the transaction */
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t_unref(t->uas.request);
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return 0;
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kill_trans:
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/* The script has hopefully set the error code. If not,
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* let us reply with a default error. */
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if ((kill_transaction_unsafe(t,
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tm_error ? tm_error : E_UNSPEC)) <=0
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) {
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LOG(L_ERR, "ERROR: t_continue: "
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"reply generation failed\n");
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/* The transaction must be explicitely released,
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* no more timer is running */
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UNLOCK_REPLIES(t);
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t_release_transaction(t);
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} else {
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UNLOCK_REPLIES(t);
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}
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t_unref(t->uas.request);
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return ret;
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}
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/* Revoke the suspension of the SIP request, i.e.
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* cancel the fr timer of the blind uac.
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* This function can be called when something fails
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* after t_suspend() has already been executed in the same
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* process, and it turns out that the transaction should
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* not have been suspended.
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*
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* Return value:
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* 0 - success
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* <0 - failure
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*/
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int t_cancel_suspend(unsigned int hash_index, unsigned int label)
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{
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struct cell *t;
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int branch;
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t = get_t();
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if (!t || t == T_UNDEFINED) {
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LOG(L_ERR, "ERROR: t_revoke_suspend: " \
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"no active transaction\n");
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return -1;
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}
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/* Only to double-check the IDs */
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if ((t->hash_index != hash_index)
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|| (t->label != label)
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) {
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LOG(L_ERR, "ERROR: t_revoke_suspend: " \
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"transaction id mismatch\n");
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return -1;
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}
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/* The transaction does not need to be locked because this
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* function is either executed from the original route block
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* or from failure route which already locks */
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reset_kr(); /* the blind UAC of t_suspend has set kr */
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/* Try to find the blind UAC, and cancel its fr timer.
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* We assume that the last blind uac called this function. */
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for ( branch = t->nr_of_outgoings-1;
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branch >= 0 && t->uac[branch].request.buffer;
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branch--);
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if (branch >= 0) {
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stop_rb_timers(&t->uac[branch].request);
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/* Set last_received to something >= 200,
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* the actual value does not matter, the branch
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* will never be picked up for response forwarding.
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* If last_received is lower than 200,
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* then the branch may tried to be cancelled later,
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* for example when t_reply() is called from
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* a failure rute => deadlock, because both
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* of them need the reply lock to be held. */
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t->uac[branch].last_received=500;
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} else {
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/* Not a huge problem, fr timer will fire, but CANCEL
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will not be sent. last_received will be set to 408. */
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return -1;
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}
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return 0;
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}
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