mirror of https://github.com/sipwise/kamailio.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
178 lines
4.7 KiB
178 lines
4.7 KiB
/*
|
|
* Copyright (C) 2001-2003 FhG Fokus
|
|
*
|
|
* This file is part of SIP-router, a free SIP server.
|
|
*
|
|
* SIP-router 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
|
|
*
|
|
* SIP-router 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:
|
|
* ----------
|
|
* 2003-04-09 Created by janakj
|
|
* 2003-10-24 updated to the new socket_info lists (andrei)
|
|
*/
|
|
|
|
/*!
|
|
* \file
|
|
* \brief TM :: Fast Call-ID generator
|
|
*
|
|
* Fast Call-ID generator. The Call-ID has the following form: \<callid_nr>-\<pid\>\@\<ip\>
|
|
* - callid_nr is initialized as a random number and continually increases
|
|
* - \<pid\>\@\<ip\> is kept in callid_suffix
|
|
* - both are separated by a '-'
|
|
* \ingroup tm
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include "../../dprint.h"
|
|
#include "../../pt.h"
|
|
#include "../../socket_info.h"
|
|
#include "callid.h"
|
|
|
|
/**
|
|
* \brief Length of a Call-ID in TM
|
|
*/
|
|
#define CALLID_NR_LEN 20
|
|
|
|
/**
|
|
* \brief Length of the Call-ID suffix
|
|
*/
|
|
#define CALLID_SUFFIX_LEN ( 1 /* - */ + \
|
|
5 /* pid */ + \
|
|
42 /* embedded v4inv6 address can be looong '128.' */ + \
|
|
2 /* parenthesis [] */ + \
|
|
1 /* ZT 0 */ + \
|
|
16 /* one never knows ;-) */ \
|
|
)
|
|
|
|
|
|
static unsigned long callid_nr;
|
|
static char callid_buf[CALLID_NR_LEN + CALLID_SUFFIX_LEN];
|
|
|
|
static str callid_prefix;
|
|
static str callid_suffix;
|
|
|
|
|
|
/**
|
|
* \brief Initialize the Call-ID generator, generates random prefix
|
|
* \return 0 on success, -1 on error
|
|
*/
|
|
int init_callid(void)
|
|
{
|
|
int rand_bits, i;
|
|
|
|
/* calculate the initial call-id */
|
|
/* how many bits and chars do we need to display the
|
|
* whole ULONG number */
|
|
callid_prefix.len = sizeof(unsigned long) * 2;
|
|
callid_prefix.s = callid_buf;
|
|
|
|
if (callid_prefix.len > CALLID_NR_LEN) {
|
|
LOG(L_ERR, "ERROR: Too small callid buffer\n");
|
|
return -1;
|
|
}
|
|
|
|
for(rand_bits = 1, i = RAND_MAX; i; i >>= 1, rand_bits++); /* how long are the rand()s ? */
|
|
i = callid_prefix.len * 4 / rand_bits; /* how many rands() fit in the ULONG ? */
|
|
|
|
/* now fill in the callid with as many random
|
|
* numbers as you can + 1 */
|
|
callid_nr = rand(); /* this is the + 1 */
|
|
|
|
while(i--) {
|
|
callid_nr <<= rand_bits;
|
|
callid_nr |= rand();
|
|
}
|
|
|
|
i = snprintf(callid_prefix.s, callid_prefix.len + 1, "%0*lx", callid_prefix.len, callid_nr);
|
|
if ((i == -1) || (i > callid_prefix.len)) {
|
|
LOG(L_CRIT, "BUG: SORRY, callid calculation failed\n");
|
|
return -2;
|
|
}
|
|
|
|
DBG("Call-ID initialization: '%.*s'\n", callid_prefix.len, callid_prefix.s);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* \brief Child initialization, generates suffix
|
|
* \param rank not used
|
|
* \return 0 on success, -1 on error
|
|
*/
|
|
int child_init_callid(int rank)
|
|
{
|
|
struct socket_info *si;
|
|
|
|
/* on tcp/tls bind_address is 0 so try to get the first address we listen
|
|
* on no matter the protocol */
|
|
si=bind_address?bind_address:get_first_socket();
|
|
if (si==0){
|
|
LOG(L_CRIT, "BUG: child_init_callid: null socket list\n");
|
|
return -1;
|
|
}
|
|
callid_suffix.s = callid_buf + callid_prefix.len;
|
|
|
|
callid_suffix.len = snprintf(callid_suffix.s, CALLID_SUFFIX_LEN,
|
|
"%c%d@%.*s", '-', my_pid(),
|
|
si->address_str.len,
|
|
si->address_str.s);
|
|
if ((callid_suffix.len == -1) || (callid_suffix.len > CALLID_SUFFIX_LEN)) {
|
|
LOG(L_ERR, "ERROR: child_init_callid: buffer too small\n");
|
|
return -1;
|
|
}
|
|
|
|
DBG("DEBUG: callid: '%.*s'\n", callid_prefix.len + callid_suffix.len, callid_prefix.s);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* \brief Increment a character in hex, return the carry flag
|
|
* \param _c input character
|
|
* \return carry flag
|
|
*/
|
|
static inline int inc_hexchar(char* _c)
|
|
{
|
|
if (*_c == '9') {
|
|
*_c = 'a';
|
|
return 0;
|
|
}
|
|
|
|
if (*_c == 'f') {
|
|
*_c = '0';
|
|
return 1;
|
|
}
|
|
|
|
(*_c)++;
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* \brief Get a unique Call-ID
|
|
* \param callid returned Call-ID
|
|
*/
|
|
void generate_callid(str* callid)
|
|
{
|
|
int i;
|
|
|
|
for(i = callid_prefix.len; i; i--) {
|
|
if (!inc_hexchar(callid_prefix.s + i - 1)) break;
|
|
}
|
|
callid->s = callid_prefix.s;
|
|
callid->len = callid_prefix.len + callid_suffix.len;
|
|
}
|