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161 lines
5.6 KiB
161 lines
5.6 KiB
/*
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* Copyright (C) 2001-2003 FhG Fokus
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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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* 2003-01-23 - msg_cloner clones msg->from->parsed too (janakj)
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* 2003-01-29 - scratchpad removed (jiri)
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* 2003-02-25 - auth_body cloner added (janakj)
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* 2003-02-28 scratchpad compatibility abandoned (jiri)
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* 2003-03-31 removed msg->repl_add_rm (andrei)
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* 2003-04-04 parsed uris are recalculated on cloning (jiri)
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* 2003-05-07 received, rport & i via shortcuts are also translated (andrei)
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* 2003-11-11 updated cloning of lump_rpl (bogdan)
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* 2004-03-31 alias shortcuts are also translated (andrei)
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* 2006-04-20 via->comp is also translated (andrei)
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* 2006-10-16 HDR_{PROXY,WWW}_AUTHENTICATE_T cloned (andrei)
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* 2007-01-26 HDR_DATE_T, HDR_IDENTITY_T, HDR_IDENTITY_INFO_T added (gergo)
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* 2007-09-05 A separate memory block is allocated for the lumps
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* in case of requests in order to allow cloning them
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* later than the SIP msg. (Miklos)
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* 2009-07-22 moved most of the functions to core sip_msg_clone.c (andrei)*/
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/**
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* @file
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* @brief TM :: Message cloning functionality
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*
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* Cloning a message into shared memory (TM keeps a snapshot
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* of messages in memory); note that many operations, which
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* allocate pkg memory (such as parsing) cannot be used with
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* a cloned message -- it would result in linking pkg structures
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* to shmem msg and eventually in a memory error.
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*
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* The cloned message is stored in a single memory fragment to
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* save too many shm_mallocs -- these are expensive as they
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* not only take lookup in fragment table but also a shmem lock
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* operation (the same for shm_free)
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*
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* Allow postponing the cloning of SIP msg:
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* t_newtran() copies the requests to shm mem without the lumps,
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* and t_forward_nonack() clones the lumps later when it is called
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* the first time.
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* @ingroup tm
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*/
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#include "defs.h"
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#include "sip_msg.h"
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#include "../../dprint.h"
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#include "../../mem/mem.h"
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#include "../../data_lump.h"
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#include "../../data_lump_rpl.h"
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#include "../../ut.h"
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#include "../../sip_msg_clone.h"
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#include "../../fix_lumps.h"
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/**
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* @brief Clone a SIP message
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* @warning Cloner does not clone all hdr_field headers (From, To, etc.). Pointers will reference pkg memory. Dereferencing will crash ser!
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* @param org_msg Original SIP message
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* @param sip_msg_len Length of the SIP message
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* @return Cloned SIP message, or NULL on error
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*/
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struct sip_msg* sip_msg_cloner( struct sip_msg *org_msg, int *sip_msg_len )
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{
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/* take care of the lumps only for replies if the msg cloning is
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postponed */
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if (org_msg->first_line.type==SIP_REPLY)
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/*cloning all the lumps*/
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return sip_msg_shm_clone(org_msg, sip_msg_len, 1);
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/* don't clone the lumps */
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return sip_msg_shm_clone(org_msg, sip_msg_len, 0);
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}
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/**
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* @brief Indicates wheter we have already cloned the msg lumps or not
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*/
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unsigned char lumps_are_cloned = 0;
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/**
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* @brief Wrapper function for msg_lump_cloner() with some additional sanity checks
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* @param shm_msg SIP message in shared memory
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* @param pkg_msg SIP message in private memory
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* @return 0 on success, -1 on error
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*/
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int save_msg_lumps( struct sip_msg *shm_msg, struct sip_msg *pkg_msg)
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{
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int ret;
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struct lump* add_rm;
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struct lump* body_lumps;
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struct lump_rpl* reply_lump;
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/* make sure that we do not clone the lumps twice */
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if (lumps_are_cloned) {
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LOG(L_DBG, "DEBUG: save_msg_lumps: lumps have been already cloned\n" );
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return 0;
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}
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/* sanity checks */
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if (unlikely(!shm_msg || ((shm_msg->msg_flags & FL_SHM_CLONE)==0))) {
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LOG(L_ERR, "ERROR: save_msg_lumps: BUG, there is no shmem-ized message"
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" (shm_msg=%p)\n", shm_msg);
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return -1;
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}
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if (unlikely(shm_msg->first_line.type!=SIP_REQUEST)) {
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LOG(L_ERR, "ERROR: save_msg_lumps: BUG, the function should be called only for requests\n" );
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return -1;
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}
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#ifdef EXTRA_DEBUG
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membar_depends();
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if (shm_msg->add_rm || shm_msg->body_lumps || shm_msg->reply_lump) {
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LOG(L_ERR, "ERROR: save_msg_lumps: BUG, trying to overwrite the already cloned lumps\n");
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return -1;
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}
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#endif
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/* needless to clone the lumps for ACK, they will not be used again */
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if (shm_msg->REQ_METHOD == METHOD_ACK)
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return 0;
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/* clean possible previous added vias/clen header or else they would
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* get propagated in the failure routes */
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free_via_clen_lump(&pkg_msg->add_rm);
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lumps_are_cloned = 1;
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ret=msg_lump_cloner(pkg_msg, &add_rm, &body_lumps, &reply_lump);
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if (likely(ret==0)){
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/* make sure the lumps are fully written before adding them to
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shm_msg (in case someone accesses it in the same time) */
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membar_write();
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shm_msg->add_rm = add_rm;
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shm_msg->body_lumps = body_lumps;
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shm_msg->reply_lump = reply_lump;
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}
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return ret<0?-1:0;
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}
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