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80 lines
2.4 KiB
80 lines
2.4 KiB
/*
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* - utility for generating to-tags
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* in Kamailio, to-tags consist of two parts: a fixed part
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* which is bound to server instance and variable part
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* which is bound to request -- that helps to recognize,
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* who generated the to-tag in loops through the same
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* server -- in such cases, fixed part is constant, but
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* the variable part varies because it depends on
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* via
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*
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* Copyright (C) 2001-2003 FhG Fokus
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*
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* This file is part of Kamailio, a free SIP server.
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*
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* Kamailio 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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* Kamailio 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _TAGS_H
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#define _TAGS_H
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#include "parser/msg_parser.h"
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#include "globals.h"
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#include "crc.h"
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#include "str.h"
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#include "socket_info.h"
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#define TOTAG_VALUE_LEN (MD5_LEN+CRC16_LEN+1)
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/*! generate variable part of to-tag for a request;
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* it will have length of CRC16_LEN, sufficiently
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* long buffer must be passed to the function */
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static inline void calc_crc_suffix( struct sip_msg *msg, char *tag_suffix)
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{
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int ss_nr;
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str suffix_source[3];
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ss_nr=2;
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if (msg->via1==0) return; /* no via, bad message */
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suffix_source[0]=msg->via1->host;
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suffix_source[1]=msg->via1->port_str;
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if (msg->via1->branch)
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suffix_source[ss_nr++]=msg->via1->branch->value;
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crcitt_string_array( tag_suffix, suffix_source, ss_nr );
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}
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static void inline init_tags( char *tag, char **suffix,
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char *signature, char separator )
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{
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str src[3];
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struct socket_info* si;
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si=get_first_socket();
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src[0].s=signature; src[0].len=strlen(signature);
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/* if we are not listening on anything we shouldn't be here */
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src[1].s=si?si->address_str.s:"";
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src[1].len=si?si->address_str.len:0;
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src[2].s=si?si->port_no_str.s:"";
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src[2].len=si?si->port_no_str.len:0;
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MD5StringArray( tag, src, 3 );
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tag[MD5_LEN]=separator;
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*suffix=tag+MD5_LEN+1;
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}
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#endif
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