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/* 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 *) saferealloc (*url, 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);
ssize_t i;
length = hashmap_entry_by_key (hashofheaders, "host", (void **) &data);
if (length <= 0) {
union sockaddr_union dest_addr;
const void *dest_inaddr;
char namebuf[INET6_ADDRSTRLEN+1];
int af;
length = sizeof(dest_addr);
if (getsockname
(connptr->client_fd, (void *) &dest_addr,
&length) < 0 || length > sizeof(dest_addr)) {
addr_err:;
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;
}
af = length == sizeof(dest_addr.v4) ? AF_INET : AF_INET6;
if (af == AF_INET) dest_inaddr = &dest_addr.v4.sin_addr;
else dest_inaddr = &dest_addr.v6.sin6_addr;
if (!inet_ntop(af, dest_inaddr, namebuf, sizeof namebuf))
goto addr_err;
request->host = safestrdup (namebuf);
request->port = ntohs (af == AF_INET ? dest_addr.v4.sin_port
: dest_addr.v6.sin6_port);
request->path = (char *) safemalloc (ulen + 1);
strlcpy (request->path, *url, ulen + 1);
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);
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->listen_addrs == NULL) {
return 1;
}
for (i = 0; i < vector_length(conf->listen_addrs); i++) {
const char *addr;
addr = (char *)vector_getentry(conf->listen_addrs, i, NULL);
if (addr && strcmp(request->host, addr) == 0) {
log_message(LOG_ERR,
"transparent: destination IP %s is local "
"on socket fd %d",
request->host, 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;
}
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