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/* tinyproxy - A fast light-weight HTTP proxy
* Copyright (C) 1999-2005 Robert James Kaes <rjkaes@users.sourceforge.net>
*
* 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.
*/
/* Allow tinyproxy to be used as a reverse proxy. */
#include "main.h"
#include "reverse-proxy.h"
#include "conns.h"
#include "heap.h"
#include "html-error.h"
#include "log.h"
/*
* Add entry to the reversepath list
*/
void reversepath_add (const char *path, const char *url)
{
struct reversepath *reverse;
if (url == NULL) {
log_message (LOG_WARNING,
"Illegal reverse proxy rule: missing url");
return;
}
if (!strstr (url, "://")) {
log_message (LOG_WARNING,
"Skipping reverse proxy rule: '%s' is not a valid url",
url);
return;
}
if (path && *path != '/') {
log_message (LOG_WARNING,
"Skipping reverse proxy rule: path '%s' "
"doesn't start with a /", path);
return;
}
reverse = (struct reversepath *) safemalloc (sizeof
(struct reversepath));
if (!reverse) {
log_message (LOG_ERR,
"Unable to allocate memory in reversepath_add()");
return;
}
if (!path)
reverse->path = safestrdup ("/");
else
reverse->path = safestrdup (path);
reverse->url = safestrdup (url);
reverse->next = config.reversepath_list;
config.reversepath_list = reverse;
log_message (LOG_INFO,
"Added reverse proxy rule: %s -> %s", reverse->path,
reverse->url);
}
/*
* Check if a request url is in the reversepath list
*/
struct reversepath *reversepath_get (char *url)
{
struct reversepath *reverse = config.reversepath_list;
while (reverse) {
if (strstr (url, reverse->path) == url)
return reverse;
reverse = reverse->next;
}
return NULL;
}
/*
* Rewrite the URL for reverse proxying.
*/
char *reverse_rewrite_url (struct conn_s *connptr, hashmap_t hashofheaders,
char *url)
{
char *rewrite_url = NULL;
char *cookie = NULL;
char *cookieval;
struct reversepath *reverse = NULL;
/* Reverse requests always start with a slash */
if (*url == '/') {
/* First try locating the reverse mapping by request url */
reverse = reversepath_get (url);
if (reverse) {
rewrite_url = (char *)
safemalloc (strlen (url) + strlen (reverse->url) +
1);
strcpy (rewrite_url, reverse->url);
strcat (rewrite_url, url + strlen (reverse->path));
} else if (config.reversemagic
&& hashmap_entry_by_key (hashofheaders,
"cookie",
(void **) &cookie) > 0) {
/* No match - try the magical tracking cookie next */
if ((cookieval = strstr (cookie, REVERSE_COOKIE "="))
&& (reverse =
reversepath_get (cookieval +
strlen (REVERSE_COOKIE) +
1))) {
rewrite_url = (char *) safemalloc
(strlen (url) +
strlen (reverse->url) +
1);
strcpy (rewrite_url, reverse->url);
strcat (rewrite_url, url + 1);
log_message (LOG_INFO,
"Magical tracking cookie says: %s",
reverse->path);
}
}
}
/* Forward proxy support off and no reverse path match found */
if (config.reverseonly && !rewrite_url) {
log_message (LOG_ERR, "Bad request");
indicate_http_error (connptr, 400, "Bad Request",
"detail",
"Request has an invalid URL", "url", url,
NULL);
return NULL;
}
log_message (LOG_CONN, "Rewriting URL: %s -> %s", url, rewrite_url);
/* Store reverse path so that the magical tracking cookie can be set */
if (config.reversemagic && reverse)
connptr->reversepath = safestrdup (reverse->path);
return rewrite_url;
}
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