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
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "curl_setup.h"
#ifndef CURL_DISABLE_PROXY
#include "inet_pton.h"
#include "strcase.h"
#include "noproxy.h"
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
/*
* Curl_cidr4_match() returns TRUE if the given IPv4 address is within the
* specified CIDR address range.
*/
UNITTEST bool Curl_cidr4_match(const char *ipv4, /* 1.2.3.4 address */
const char *network, /* 1.2.3.4 address */
unsigned int bits)
{
unsigned int address = 0;
unsigned int check = 0;
if(bits > 32)
/* strange input */
return FALSE;
if(1 != Curl_inet_pton(AF_INET, ipv4, &address))
return FALSE;
if(1 != Curl_inet_pton(AF_INET, network, &check))
return FALSE;
if(bits && (bits != 32)) {
unsigned int mask = 0xffffffff << (32 - bits);
unsigned int haddr = htonl(address);
unsigned int hcheck = htonl(check);
#if 0
fprintf(stderr, "Host %s (%x) network %s (%x) bits %u mask %x => %x\n",
ipv4, haddr, network, hcheck, bits, mask,
(haddr ^ hcheck) & mask);
#endif
if((haddr ^ hcheck) & mask)
return FALSE;
return TRUE;
}
return (address == check);
}
UNITTEST bool Curl_cidr6_match(const char *ipv6,
const char *network,
unsigned int bits)
{
#ifdef ENABLE_IPV6
int bytes;
int rest;
unsigned char address[16];
unsigned char check[16];
if(!bits)
bits = 128;
bytes = bits/8;
rest = bits & 0x07;
if(1 != Curl_inet_pton(AF_INET6, ipv6, address))
return FALSE;
if(1 != Curl_inet_pton(AF_INET6, network, check))
return FALSE;
if((bytes > 16) || ((bytes == 16) && rest))
return FALSE;
if(bytes && memcmp(address, check, bytes))
return FALSE;
if(rest && !((address[bytes] ^ check[bytes]) & (0xff << (8 - rest))))
return FALSE;
return TRUE;
#else
(void)ipv6;
(void)network;
(void)bits;
return FALSE;
#endif
}
enum nametype {
TYPE_HOST,
TYPE_IPV4,
TYPE_IPV6
};
/****************************************************************
* Checks if the host is in the noproxy list. returns TRUE if it matches and
* therefore the proxy should NOT be used.
****************************************************************/
bool Curl_check_noproxy(const char *name, const char *no_proxy)
{
/* no_proxy=domain1.dom,host.domain2.dom
* (a comma-separated list of hosts which should
* not be proxied, or an asterisk to override
* all proxy variables)
*/
if(no_proxy && no_proxy[0]) {
const char *p = no_proxy;
size_t namelen;
enum nametype type = TYPE_HOST;
char hostip[128];
if(!strcmp("*", no_proxy))
return TRUE;
/* NO_PROXY was specified and it wasn't just an asterisk */
if(name[0] == '[') {
char *endptr;
/* IPv6 numerical address */
endptr = strchr(name, ']');
if(!endptr)
return FALSE;
name++;
namelen = endptr - name;
if(namelen >= sizeof(hostip))
return FALSE;
memcpy(hostip, name, namelen);
hostip[namelen] = 0;
name = hostip;
type = TYPE_IPV6;
}
else {
unsigned int address;
if(1 == Curl_inet_pton(AF_INET, name, &address))
type = TYPE_IPV4;
namelen = strlen(name);
}
while(*p) {
const char *token;
size_t tokenlen = 0;
bool match = FALSE;
/* pass blanks */
while(*p && ISBLANK(*p))
p++;
token = p;
/* pass over the pattern */
while(*p && !ISBLANK(*p) && (*p != ',')) {
p++;
tokenlen++;
}
if(tokenlen) {
switch(type) {
case TYPE_HOST:
if(*token == '.') {
++token;
--tokenlen;
/* tailmatch */
match = (tokenlen <= namelen) &&
strncasecompare(token, name + (namelen - tokenlen), namelen);
}
else
match = (tokenlen == namelen) &&
strncasecompare(token, name, namelen);
break;
case TYPE_IPV4:
/* FALLTHROUGH */
case TYPE_IPV6: {
const char *check = token;
char *slash = strchr(check, '/');
unsigned int bits = 0;
char checkip[128];
/* if the slash is part of this token, use it */
if(slash && (slash < &check[tokenlen])) {
bits = atoi(slash + 1);
/* copy the check name to a temp buffer */
if(tokenlen >= sizeof(checkip))
break;
memcpy(checkip, check, tokenlen);
checkip[ slash - check ] = 0;
check = checkip;
}
if(type == TYPE_IPV6)
match = Curl_cidr6_match(name, check, bits);
else
match = Curl_cidr4_match(name, check, bits);
break;
}
}
if(match)
return TRUE;
} /* if(tokenlen) */
while(*p == ',')
p++;
} /* while(*p) */
} /* NO_PROXY was specified and it wasn't just an asterisk */
return FALSE;
}
#endif /* CURL_DISABLE_PROXY */
|
