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/*
* $Id: maxfwd.c,v 1.6 2006/06/21 18:39:26 bogdan_iancu Exp $
*
* MAXFWD module
*
* Copyright (C) 2001-2003 FhG Fokus
*
* This file is part of openser, a free SIP server.
*
* openser is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version
*
* openser is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* History:
* --------
* 2003-03-11 updated to the new module interface (andrei)
* 2003-03-16 flags export parameter added (janakj)
* 2003-03-19 all mallocs/frees replaced w/ pkg_malloc/pkg_free (andrei)
* 2004-08-15 max value of max-fwd header is configurable via max_limit
* module param (bogdan)
* 2005-09-15 max_limit param cannot be disabled anymore (according to RFC)
* (bogdan)
* 2005-11-03 is_maxfwd_lt() function added; MF value saved in
* msg->maxforwards->parsed (bogdan)
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "../../sr_module.h"
#include "../../dprint.h"
#include "../../error.h"
#include "../../ut.h"
#include "../../mem/mem.h"
#include "mf_funcs.h"
MODULE_VERSION
#define MAXFWD_UPPER_LIMIT 256
static int max_limit = MAXFWD_UPPER_LIMIT;
static int fixup_maxfwd_header(void** param, int param_no);
static int w_process_maxfwd_header(struct sip_msg* msg,char* str,char* str2);
static int is_maxfwd_lt(struct sip_msg *msg, char *slimit, char *foo);
static int mod_init(void);
static cmd_export_t cmds[]={
{"mf_process_maxfwd_header", w_process_maxfwd_header, 1,
fixup_maxfwd_header, REQUEST_ROUTE},
{"is_maxfwd_lt", is_maxfwd_lt, 1,
fixup_maxfwd_header, REQUEST_ROUTE|FAILURE_ROUTE|BRANCH_ROUTE},
{0,0,0,0,0}
};
static param_export_t params[]={
{"max_limit", INT_PARAM, &max_limit},
{0,0,0}
};
#ifdef STATIC_MAXFWD
struct module_exports maxfwd_exports = {
#else
struct module_exports exports= {
#endif
"maxfwd",
cmds,
params,
0, /* exported statistics */
mod_init,
(response_function) 0,
(destroy_function) 0,
0 /* per-child init function */
};
static int mod_init(void)
{
LOG(L_NOTICE, "Maxfwd module- initializing\n");
if ( max_limit<1 || max_limit>MAXFWD_UPPER_LIMIT ) {
LOG(L_ERR,"ERROR:maxfwd:init: invalid max limit (%d) [1,%d]\n",
max_limit,MAXFWD_UPPER_LIMIT);
return E_CFG;
}
return 0;
}
static int fixup_maxfwd_header(void** param, int param_no)
{
unsigned long code;
int err;
if (param_no==1){
code=str2s(*param, strlen(*param), &err);
if (err==0){
if (code<1 || code>MAXFWD_UPPER_LIMIT){
LOG(L_ERR, "ERROR:maxfwd:fixup_maxfwd_header: "
"invalid MAXFWD number <%ld> [1,%d]\n",
code,MAXFWD_UPPER_LIMIT);
return E_UNSPEC;
}
if (code>max_limit) {
LOG(L_ERR, "ERROR:maxfwd:fixup_maxfwd_header: "
"default value <%ld> bigger than max limit(%d)\n",
code, max_limit);
return E_UNSPEC;
}
pkg_free(*param);
*param=(void*)code;
return 0;
}else{
LOG(L_ERR, "ERROR:maxfwd:fixup_maxfwd_header: bad number <%s>\n",
(char*)(*param));
return E_UNSPEC;
}
}
return 0;
}
static int w_process_maxfwd_header(struct sip_msg* msg, char* str1,char* str2)
{
int val;
str mf_value;
val=is_maxfwd_present(msg, &mf_value);
switch (val) {
/* header not found */
case -1:
if (add_maxfwd_header( msg, (unsigned int)(unsigned long)str1)!=0)
goto error;
return 2;
/* error */
case -2:
break;
/* found */
case 0:
return -1;
default:
if (val>max_limit){
DBG("DBG:maxfwd:process_maxfwd_header: "
"value %d decreased to %d\n", val, max_limit);
val = max_limit+1;
}
if ( decrement_maxfwd(msg, val, &mf_value)!=0 ) {
LOG( L_ERR,"ERROR:maxfwd:process_maxfwd_header: "
"decrement failed!\n");
goto error;
}
}
return 1;
error:
return -2;
}
static int is_maxfwd_lt(struct sip_msg *msg, char *slimit, char *foo)
{
str mf_value;
int limit;
int val;
limit = (int)(long)slimit;
val = is_maxfwd_present( msg, &mf_value);
DBG("DEBUG:maxfwd:is_maxfwd_lt: value = %d \n",val);
if ( val<0 ) {
/* error or not found */
return val-1;
} else if ( val>=limit ) {
/* greater or equal than/to limit */
return -1;
}
return 1;
}
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