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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 "tinyproxy.h"
#include "transparent-proxy.h"
#include "conns.h"
#include "heap.h"
#include "html-error.h"
#include "log.h"
#include "reqs.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 = 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;
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 = safemalloc(17);
strcpy(request->host, inet_ntoa(dest_addr.sin_addr));
request->port = ntohs(dest_addr.sin_port);
request->path = safemalloc(strlen(url) + 1);
strcpy(request->path, url);
safefree(url);
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 = safemalloc(length + 1);
if (sscanf
(data, "%[^:]:%hu", request->host,
&request->port) != 2) {
strcpy(request->host, data);
request->port = HTTP_PORT;
}
request->path = safemalloc(strlen(url) + 1);
strcpy(request->path, url);
safefree(url);
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;
}
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