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
|
/* tinyproxy - A fast light-weight HTTP proxy
* Copyright (C) 2002 Petr Lampa <lampa@fit.vutbr.cz>
* Copyright (C) 2008 Robert James Kaes <rjk@wormbytes.ca>
*
* 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 2 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* This section of code is used for the transparent proxy option. You will
* need to configure your firewall to redirect all connections for HTTP
* traffic to tinyproxy for this to work properly.
*/
#include "transparent-proxy.h"
#include "conns.h"
#include "heap.h"
#include "html-error.h"
#include "log.h"
#include "reqs.h"
#include "text.h"
#include "conf.h"
/*
* Build a URL from parts.
*/
static int build_url (char **url, const char *host, int port, const char *path)
{
int len;
assert (url != NULL);
assert (host != NULL);
assert (port > 0 && port < 32768);
assert (path != NULL);
len = strlen (host) + strlen (path) + 14;
*url = (char *) safemalloc (len);
if (*url == NULL)
return -1;
return snprintf (*url, len, "http://%s:%d%s", host, port, path);
}
int
do_transparent_proxy (struct conn_s *connptr, hashmap_t hashofheaders,
struct request_s *request, struct config_s *conf,
char **url)
{
socklen_t length;
char *data;
size_t ulen = strlen (*url);
length = hashmap_entry_by_key (hashofheaders, "host", (void **) &data);
if (length <= 0) {
struct sockaddr_in dest_addr;
if (getsockname
(connptr->client_fd, (struct sockaddr *) &dest_addr,
&length) < 0) {
log_message (LOG_ERR,
"process_request: cannot get destination IP for %d",
connptr->client_fd);
indicate_http_error (connptr, 400, "Bad Request",
"detail", "Unknown destination",
"url", *url, NULL);
return 0;
}
request->host = (char *) safemalloc (17);
strlcpy (request->host, inet_ntoa (dest_addr.sin_addr), 17);
request->port = ntohs (dest_addr.sin_port);
request->path = (char *) safemalloc (ulen + 1);
strlcpy (request->path, *url, ulen + 1);
/* url overwritten by the call below is the url passed
* to this function, and is not the url variable in the
* caller. */
build_url (url, request->host, request->port, request->path);
log_message (LOG_INFO,
"process_request: trans IP %s %s for %d",
request->method, *url, connptr->client_fd);
} else {
request->host = (char *) safemalloc (length + 1);
if (sscanf (data, "%[^:]:%hu", request->host, &request->port) !=
2) {
strlcpy (request->host, data, length + 1);
request->port = HTTP_PORT;
}
request->path = (char *) safemalloc (ulen + 1);
strlcpy (request->path, *url, ulen + 1);
/* url overwritten by the call below is the url passed
* to this function, and is not the url variable in the
* caller. */
build_url (url, request->host, request->port, request->path);
log_message (LOG_INFO,
"process_request: trans Host %s %s for %d",
request->method, *url, connptr->client_fd);
}
if (conf->ipAddr && strcmp (request->host, conf->ipAddr) == 0) {
log_message (LOG_ERR,
"process_request: destination IP is localhost %d",
connptr->client_fd);
indicate_http_error (connptr, 400, "Bad Request",
"detail",
"You tried to connect to the machine "
"the proxy is running on", "url", *url,
NULL);
return 0;
}
return 1;
}
|
