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/*
* Copyright (c) 2008-2024 OARC, Inc.
* Copyright (c) 2007-2008, Internet Systems Consortium, Inc.
* Copyright (c) 2003-2007, The Measurement Factory, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "client_subnet_index.h"
#include "xmalloc.h"
#include "hashtbl.h"
#include "syslog_debug.h"
static hashfunc ipnet_hashfunc;
static hashkeycmp ipnet_cmpfunc;
static inX_addr v4mask;
static inX_addr v6mask;
static int v4set = 0, v6set = 0;
#define MAX_ARRAY_SZ 65536
static hashtbl* theHash = NULL;
static int next_idx = 0;
typedef struct
{
inX_addr addr;
int index;
} ipnetobj;
int client_subnet_indexer(const dns_message* m)
{
ipnetobj* obj;
inX_addr masked_addr;
inX_addr* client_ip_addr = m->qr ? &m->tm->dst_ip_addr : &m->tm->src_ip_addr;
if (m->malformed)
return -1;
if (NULL == theHash) {
theHash = hash_create(MAX_ARRAY_SZ, ipnet_hashfunc, ipnet_cmpfunc, 1, NULL, afree);
if (NULL == theHash)
return -1;
}
if (6 == inXaddr_version(client_ip_addr))
masked_addr = inXaddr_mask(client_ip_addr, &v6mask);
else
masked_addr = inXaddr_mask(client_ip_addr, &v4mask);
if ((obj = hash_find(&masked_addr, theHash)))
return obj->index;
obj = acalloc(1, sizeof(*obj));
if (NULL == obj)
return -1;
obj->addr = masked_addr;
obj->index = next_idx;
if (0 != hash_add(&obj->addr, obj, theHash)) {
afree(obj);
return -1;
}
next_idx++;
return obj->index;
}
int client_subnet_iterator(const char** label)
{
ipnetobj* obj;
static char label_buf[128];
if (0 == next_idx)
return -1;
if (NULL == label) {
hash_iter_init(theHash);
return next_idx;
}
if ((obj = hash_iterate(theHash)) == NULL)
return -1;
inXaddr_ntop(&obj->addr, label_buf, 128);
*label = label_buf;
return obj->index;
}
void client_subnet_reset()
{
theHash = NULL;
next_idx = 0;
}
void client_subnet_init(void)
{
if (!v4set) {
inXaddr_pton("255.255.255.0", &v4mask);
}
if (!v6set) {
inXaddr_pton("ffff:ffff:ffff:ffff:ffff:ffff:0000:0000", &v6mask);
}
}
int client_subnet_v4_mask_set(const char* mask)
{
v4set = 1;
dsyslogf(LOG_INFO, "change v4 mask to %s", mask);
return inXaddr_pton(mask, &v4mask);
}
int client_subnet_v6_mask_set(const char* mask)
{
v6set = 1;
dsyslogf(LOG_INFO, "change v6 mask to %s", mask);
return inXaddr_pton(mask, &v6mask);
}
static unsigned int
ipnet_hashfunc(const void* key)
{
const inX_addr* a = key;
return inXaddr_hash(a);
}
static int
ipnet_cmpfunc(const void* a, const void* b)
{
const inX_addr* a1 = a;
const inX_addr* a2 = b;
return inXaddr_cmp(a1, a2);
}
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