char_msg_val.h

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/* 
 * $Id$
 * 
 * Copyright (C) 2010 iptelorg GmbH
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
/*
 * char_msg_val.h
 */
/*
 * History:
 * --------
 *  2010-02-10  moved from parser/msg_parser.h and added tag only mode
 *               by default (andrei)
*/
/* Defines:
 *  BRANCH_INCLUDE_FROMTO_BODY - if defined the old (pre 3.1) mode of
 *   including the full from & to bodies will be used (instead of only the
 *   tags).
 * BRANCH_IGNORE_3261_VIA - if defined, no check and special/simpler handling
 *   of messages with 3261 cookies in the via branch will be made (same
 *   behaviour as in pre 3.1 versions).
*/

#ifndef __char_msg_val_h
#define __char_msg_val_h

#include "comp_defs.h"
#include "compiler_opt.h"
#include "str.h"
#include "parser/msg_parser.h"
#include "parser/parse_to.h"
#include "parser/parse_from.h"
#include "md5utils.h"

inline static int char_msg_val( struct sip_msg *msg, char *cv )
{
        str src[8];

        if (unlikely(!check_transaction_quadruple(msg))) {
                LOG(L_ERR, "ERROR: can't calculate char_value due "
                        "to a parsing error\n");
                memset( cv, '0', MD5_LEN );
                return 0;
        }
#ifndef BRANCH_IGNORE_3261_VIA
        if (likely(msg->via1->branch && msg->via1->branch->value.len>MCOOKIE_LEN &&
                                memcmp(msg->via1->branch->value.s, MCOOKIE, MCOOKIE_LEN)==0)){
                /* 3261 branch cookie present => hash only the received branch ID */
                src[0]=msg->via1->branch->value;
                MD5StringArray ( cv, src, 1 );
                return 1; /* success */
        }
#endif /* BRANCH_IGNORE_3261_VIA */
#ifdef BRANCH_INCLUDE_FROMTO_BODY
        /* use the from & to full bodies */
        src[0]= msg->from->body;
        src[1]= msg->to->body;
#else
        /* to body is automatically parsed (via check_transactionquadruple / 
           parse_header), but the from body has to be parsed manually */
        if (msg->from->parsed==0){
                /* parse from body */
                if (unlikely(parse_from_header(msg) == -1)){
                        LOG(L_ERR, "error while parsing From header\n");
                        return 0;
                }
        }
        /* use only the from & to tags */
        src[0]=get_from(msg)->tag_value;
        src[1]=get_to(msg)->tag_value;
#endif /* BRANCH_INCLUDE_FROMTO_BODY */
        src[2]= msg->callid->body;
        src[3]= msg->first_line.u.request.uri;
        src[4]= get_cseq( msg )->number;

        /* topmost Via is part of transaction key as well ! */
        src[5]= msg->via1->host;
        src[6]= msg->via1->port_str;
        if (likely(msg->via1->branch)) {
                src[7]= msg->via1->branch->value;
                MD5StringArray ( cv, src, 8 );
        } else {
                MD5StringArray( cv, src, 7 );
        }
        return 1;
}



#endif /*__char_msg_val_h*/

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