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121 lines
3.7 KiB
121 lines
3.7 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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/**
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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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#ifndef _SIP_MSG_H
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#define _SIP_MSG_H
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#include "defs.h"
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#include "../../parser/msg_parser.h"
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#include "../../mem/shm_mem.h"
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#include "../../atomic_ops.h" /* membar_depends() */
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/**
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* @brief Helper function to free a SIP message
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*
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* msg is a reply: one memory block was allocated
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*
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* msg is a request: two memory blocks were allocated:
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* - one for the sip_msg struct
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* - another one for the lumps which is linked to add_rm, body_lumps,
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* or reply_lump
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*/
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#define _sip_msg_free(_free_func, _p_msg) \
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do{ \
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if (_p_msg->first_line.type==SIP_REPLY) { \
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_free_func( (_p_msg) ); \
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} else { \
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membar_depends(); \
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if ((_p_msg)->add_rm) \
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_free_func((_p_msg)->add_rm); \
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else if ((_p_msg)->body_lumps) \
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_free_func((_p_msg)->body_lumps); \
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else if ((_p_msg)->reply_lump) \
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_free_func((_p_msg)->reply_lump); \
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\
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_free_func( (_p_msg) ); \
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} \
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}while(0)
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/**
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* @brief Free a SIP message safely, with locking
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*/
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#define sip_msg_free(_p_msg) _sip_msg_free(shm_free, _p_msg)
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/**
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* @brief Free a SIP message unsafely, without locking
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*/
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#define sip_msg_free_unsafe(_p_msg) _sip_msg_free(shm_free_unsafe, _p_msg)
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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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* @brief Indicates wheter we have already cloned the msg lumps or not
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*/
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extern unsigned char lumps_are_cloned;
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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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#endif
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