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153 lines
3.9 KiB
153 lines
3.9 KiB
/*
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* $Id$
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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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* History:
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* ----------
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* 2003-02-28 scratchpad compatibility abandoned (jiri)
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* 2002-01-28 scratchpad removed (jiri)
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* 2004-08-15 max value of max-fwd header is configurable (bogdan)
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* 2005-11-03 MF value saved in msg->maxforwards->parsed (bogdan)
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*/
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#include <stdlib.h>
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#include <string.h>
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#include "mf_funcs.h"
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#include "../../mem/mem.h"
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#include "../../ut.h"
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#include "../../data_lump.h"
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#define MF_HDR "Max-Forwards: "
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#define MF_HDR_LEN (sizeof(MF_HDR) - 1)
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/* do a tricky thing and keep the parsed value of MAXFWD hdr incremented
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* by one in order to make difference between 0 (not set)
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* and 0 (zero value) - bogdan */
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#define IS_MAXWD_STORED(_msg_) \
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((_msg_)->maxforwards->parsed)
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#define STORE_MAXWD_VAL(_msg_,_val_) \
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(_msg_)->maxforwards->parsed = ((void*)(long)((_val_)+1))
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#define FETCH_MAXWD_VAL(_msg_) \
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(((int)(long)(_msg_)->maxforwards->parsed)-1)
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/* looks for the MAX FORWARDS header
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returns its value, -1 if is not present or -2 for error */
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int is_maxfwd_present( struct sip_msg* msg , str *foo)
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{
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int x, err;
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/* lookup into the message for MAX FORWARDS header*/
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if ( !msg->maxforwards ) {
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if ( parse_headers( msg , HDR_MAXFORWARDS_F, 0 )==-1 ){
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LM_ERR("parsing MAX_FORWARD header failed!\n");
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return -2;
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}
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if (!msg->maxforwards) {
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LM_DBG("max_forwards header not found!\n");
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return -1;
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}
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} else if (IS_MAXWD_STORED(msg)) {
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trim_len( foo->len , foo->s , msg->maxforwards->body );
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return FETCH_MAXWD_VAL(msg);
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}
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/* if header is present, trim to get only the string containing numbers */
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trim_len( foo->len , foo->s , msg->maxforwards->body );
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/* convert from string to number */
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x = str2s( foo->s,foo->len,&err);
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if (err){
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LM_ERR("unable to parse the max forwards number\n");
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return -2;
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}
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/* store the parsed values */
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STORE_MAXWD_VAL(msg, x);
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LM_DBG("value = %d \n",x);
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return x;
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}
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int decrement_maxfwd( struct sip_msg* msg , int x, str *s)
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{
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int i;
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/* decrement the value */
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x--;
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/* update the stored value */
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STORE_MAXWD_VAL(msg, x);
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/*rewriting the max-fwd value in the message (buf and orig)*/
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for(i = s->len - 1; i >= 0; i--) {
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s->s[i] = (x % 10) + '0';
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x /= 10;
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if (x==0) {
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i = i - 1;
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break;
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}
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}
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while(i >= 0) s->s[i--] = ' ';
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return 0;
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}
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int add_maxfwd_header( struct sip_msg* msg , unsigned int val )
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{
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unsigned int len;
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char *buf;
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struct lump* anchor;
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/* constructing the header */
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len = MF_HDR_LEN /*"MAX-FORWARDS: "*/+ CRLF_LEN + 3/*val max on 3 digits*/;
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buf = (char*)pkg_malloc( len );
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if (!buf) {
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LM_ERR("add_maxfwd_header: no more pkg memory\n");
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goto error;
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}
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memcpy( buf , MF_HDR, MF_HDR_LEN );
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len = MF_HDR_LEN ;
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len += btostr( buf+len , val );
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memcpy( buf+len , CRLF , CRLF_LEN );
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len +=CRLF_LEN;
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/*inserts the header at the beginning of the message*/
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anchor = anchor_lump(msg, msg->headers->name.s - msg->buf, 0 , 0);
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if (anchor == 0) {
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LM_ERR("add_maxfwd_header: failed to get anchor\n");
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goto error1;
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}
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if (insert_new_lump_before(anchor, buf, len, 0) == 0) {
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LM_ERR("add_maxfwd_header: failed to insert MAX-FORWARDS lump\n");
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goto error1;
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}
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return 0;
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error1:
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pkg_free( buf );
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error:
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return -1;
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}
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