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/* $Id: hash.c $ */
/*
* Copyright (c) 2003,2004 Armin Wolfermann
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#ifndef VBOX
#include <config.h>
#include "dnsproxy.h"
#define HASHSIZE 10
#define HASH(id) (id & ((1 << HASHSIZE) - 1))
static struct request *request_hash[1 << HASHSIZE];
#else /* VBOX */
# include "slirp.h"
#endif
void
hash_add_request(PNATState pData, struct request *req)
{
struct request **p = &request_hash[HASH(req->id)];
Log2(("NAT: hash req id %d has been added \n", req->id));
if ((req->next = *p) != NULL) {
(*p)->prev = &req->next;
++hash_collisions;
}
*p = req;
req->prev = p;
++active_queries;
}
void
hash_remove_request(PNATState pData, struct request *req)
{
if (!req->prev) return;
if (req->next)
req->next->prev = req->prev;
*req->prev = req->next;
req->prev = NULL;
--active_queries;
}
struct request *
hash_find_request(PNATState pData, unsigned short id)
{
struct request *req = request_hash[HASH(id)];
Log2(("NAT: hash try to find req by id %d \n", id));
for (;;) {
if (!req) break;
if (req->id == id) break;
req = req->next;
}
return req;
}
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