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kamailio/modules/auth/nid.c

100 lines
2.5 KiB

/*
* Digest Authentication Module
* nonce id and pool management (stuff common to nonce-count and one
* time nonces)
*
* Copyright (C) 2008 iptelorg GmbH
*
* This file is part of Kamailio, a free SIP server.
*
* Kamailio 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
*
* Kamailio 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
/*
* Defines:
* USE_NC, USE_OT_NONCE - if neither of them defined no code will be
* compiled
*/
unsigned int nid_pool_no; /* number of index pools, 2^k */
#if defined USE_NC || defined USE_OT_NONCE
#include "nid.h"
#include "../../dprint.h"
#include "../../bit_scan.h"
struct pool_index* nid_crt=0;
/* instead of storing only the 2^k size we store also k
* for faster operations */
unsigned int nid_pool_k; /* pools no in bits (k in 2^k) */
unsigned int nid_pool_mask; /* mask for computing the current pool*/
/* returns -1 on error, 0 on success */
int init_nonce_id()
{
unsigned pool_no, r;
if (nid_crt!=0)
return 0; /* already init */
if (nid_pool_no==0){
nid_pool_no=DEFAULT_NID_POOL_SIZE;
}
if (nid_pool_no>MAX_NID_POOL_SIZE){
WARN("auth: nid_pool_no too big, truncating to %d\n",
MAX_NID_POOL_SIZE);
nid_pool_no=MAX_NID_POOL_SIZE;
}
nid_pool_k=bit_scan_reverse32(nid_pool_no);
nid_pool_mask=(1<<nid_pool_k)-1;
pool_no=1UL<<nid_pool_k; /* ROUNDDOWN to 2^k */
if (pool_no!=nid_pool_no){
INFO("auth: nid_pool_no rounded down to %d\n", pool_no);
}
nid_pool_no=pool_no;
nid_crt=shm_malloc(sizeof(*nid_crt)*nid_pool_no);
if (nid_crt==0){
ERR("auth: init_nonce_id: memory allocation failure\n");
return -1;
}
/* init nc_crt_id with random values */
for (r=0; r<nid_pool_no; r++)
atomic_set(&nid_crt[r].id, random());
return 0;
/*
error:
destroy_nonce_id();
return -1;
*/
}
void destroy_nonce_id()
{
if (nid_crt){
shm_free(nid_crt);
nid_crt=0;
}
}
#endif /*if defined USE_NC || defined USE_OT_NONCE */