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
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
|
/* Copyright (C) 2011 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program 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 3 of the License, or
(at your option) any later version.
This program 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, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include <stdlib.h>
#include "common/acl.h"
static int acl_compare(void *k1, void *k2)
{
sockaddr_t* a1 = (sockaddr_t *)k1;
sockaddr_t* a2 = (sockaddr_t *)k2;
/* Check different length, IPv4 goes first. */
int ldiff = a1->len - a2->len;
if (ldiff != 0) {
return ldiff < 0 ? -1 : 1;
}
/* Compare integers if IPv4. */
if (a1->len == sizeof(struct sockaddr_in)) {
/* Allow if k1 == INADDR_ANY. */
if (a1->addr4.sin_addr.s_addr == 0) {
return 0;
}
/* Compare address. */
ldiff = a1->addr4.sin_addr.s_addr - a2->addr4.sin_addr.s_addr;
if (ldiff != 0) {
return ldiff < 0 ? -1 : 1;
}
/* Port = 0 means any port match. */
if (a1->addr4.sin_port == 0) {
return 0;
}
/* Compare ports on address match. */
ldiff = ntohs(a1->addr4.sin_port) - ntohs(a2->addr4.sin_port);
if (ldiff != 0) {
return ldiff < 0 ? -1 : 1;
}
return 0;
}
/* IPv6 matching. */
#ifndef DISABLE_IPV6
if (a1->len == sizeof(struct sockaddr_in6)) {
/* Compare address. */
ldiff = memcmp(&a1->addr6.sin6_addr,
&a2->addr6.sin6_addr,
sizeof(struct in6_addr));
if (ldiff < 0) {
return -1;
}
if (ldiff > 0) {
return 1;
}
/* Port = 0 means any port match. */
if (a1->addr6.sin6_port == 0) {
return 0;
}
/* Compare ports on address match. */
ldiff = ntohs(a1->addr6.sin6_port) - ntohs(a2->addr6.sin6_port);
if (ldiff != 0) {
return ldiff < 0 ? -1 : 1;
}
return 0;
}
#endif
return 0;
}
acl_t *acl_new(acl_rule_t default_rule, const char *name)
{
/* Trailing '\0' for NULL name. */
size_t name_len = 1;
if (name) {
name_len += strlen(name);
} else {
name = "";
}
/* Allocate memory for ACL. */
acl_t* acl = malloc(sizeof(acl_t) + name_len);
if (!acl) {
return 0;
}
/* Initialize skip list. */
acl->rules = skip_create_list(acl_compare);
if (!acl->rules) {
free(acl);
return 0;
}
/* Initialize. */
memcpy(&acl->name, name, name_len);
acl->default_rule = default_rule;
return acl;
}
void acl_delete(acl_t **acl)
{
if ((acl == NULL) || (*acl == NULL)) {
return;
}
/* Truncate rules. */
if (acl_truncate(*acl) != ACL_ACCEPT) {
return;
}
/* Free ACL. */
free(*acl);
*acl = 0;
}
int acl_create(acl_t *acl, const sockaddr_t* addr, acl_rule_t rule, void *val)
{
if (!acl || !addr) {
return ACL_ERROR;
}
/* Insert into skip list. */
acl_key_t *key = malloc(sizeof(acl_key_t));
memcpy(&key->addr, addr, sizeof(sockaddr_t));
sockaddr_update(&key->addr);
key->rule = rule;
key->val = val;
skip_insert(acl->rules, &key->addr, key, 0);
return ACL_ACCEPT;
}
int acl_match(acl_t *acl, const sockaddr_t* addr, acl_key_t **key)
{
if (!acl || !addr) {
return ACL_ERROR;
}
acl_key_t *found = skip_find(acl->rules, (void*)addr);
/* Set stored value if exists. */
if (key != 0) {
*key = found;
}
/* Return appropriate rule. */
if (!found) {
return acl->default_rule;
}
return found->rule;
}
int acl_truncate(acl_t *acl)
{
if (acl == NULL) {
return ACL_ERROR;
}
/* Destroy all rules. */
skip_destroy_list(&acl->rules, 0, free);
return ACL_ACCEPT;
}
|
