1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
/*
* 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.
*/
#include <config.h>
#include "dnsproxy.h"
#define HASHSIZE 10
#define HASH(id) (id & ((1 << HASHSIZE) - 1))
static struct request *request_hash[1 << HASHSIZE];
void
hash_add_request(struct request *req)
{
struct request **p = &request_hash[HASH(req->id)];
if ((req->next = *p) != NULL) {
(*p)->prev = &req->next;
++hash_collisions;
}
*p = req;
req->prev = p;
++active_queries;
}
void
hash_remove_request(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(unsigned short id)
{
struct request *req = request_hash[HASH(id)];
for (;;) {
if (!req) break;
if (req->id == id) break;
req = req->next;
}
return req;
}
|
