2012-06-28 03:17:49 +00:00
|
|
|
const char gateway_rcs[] = "$Id: gateway.c,v 1.83 2011/12/24 15:28:45 fabiankeil Exp $";
|
2012-05-03 18:32:18 +00:00
|
|
|
/*********************************************************************
|
|
|
|
*
|
|
|
|
* File : $Source: /cvsroot/ijbswa/current/gateway.c,v $
|
|
|
|
*
|
|
|
|
* Purpose : Contains functions to connect to a server, possibly
|
|
|
|
* using a "forwarder" (i.e. HTTP proxy and/or a SOCKS4
|
|
|
|
* or SOCKS5 proxy).
|
|
|
|
*
|
2012-06-28 03:17:49 +00:00
|
|
|
* Copyright : Written by and Copyright (C) 2001-2009 the
|
2012-05-03 18:32:18 +00:00
|
|
|
* Privoxy team. http://www.privoxy.org/
|
|
|
|
*
|
|
|
|
* Based on the Internet Junkbuster originally written
|
|
|
|
* by and Copyright (C) 1997 Anonymous Coders and
|
|
|
|
* Junkbusters Corporation. http://www.junkbusters.com
|
|
|
|
*
|
|
|
|
* 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.
|
|
|
|
*
|
|
|
|
* The GNU General Public License should be included with
|
|
|
|
* this file. If not, you can view it at
|
|
|
|
* http://www.gnu.org/copyleft/gpl.html
|
|
|
|
* or write to the Free Software Foundation, Inc., 59
|
|
|
|
* Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
|
|
*
|
|
|
|
*********************************************************************/
|
2012-06-28 03:17:49 +00:00
|
|
|
|
2012-05-03 18:32:18 +00:00
|
|
|
|
|
|
|
#include "config.h"
|
|
|
|
|
|
|
|
#include <stdio.h>
|
|
|
|
#include <sys/types.h>
|
|
|
|
|
|
|
|
#ifndef _WIN32
|
|
|
|
#include <netinet/in.h>
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#include <errno.h>
|
|
|
|
#include <string.h>
|
|
|
|
#include "assert.h"
|
|
|
|
|
|
|
|
#ifdef _WIN32
|
|
|
|
#include <winsock2.h>
|
|
|
|
#endif /* def _WIN32 */
|
|
|
|
|
|
|
|
#ifdef __BEOS__
|
|
|
|
#include <netdb.h>
|
|
|
|
#endif /* def __BEOS__ */
|
|
|
|
|
|
|
|
#ifdef __OS2__
|
|
|
|
#include <utils.h>
|
|
|
|
#endif /* def __OS2__ */
|
|
|
|
|
|
|
|
#include "project.h"
|
|
|
|
#include "jcc.h"
|
|
|
|
#include "errlog.h"
|
|
|
|
#include "jbsockets.h"
|
|
|
|
#include "gateway.h"
|
|
|
|
#include "miscutil.h"
|
|
|
|
#ifdef FEATURE_CONNECTION_KEEP_ALIVE
|
|
|
|
#ifdef HAVE_POLL
|
2012-06-28 03:17:49 +00:00
|
|
|
#ifdef __GLIBC__
|
2012-05-03 18:32:18 +00:00
|
|
|
#include <sys/poll.h>
|
|
|
|
#else
|
|
|
|
#include <poll.h>
|
|
|
|
#endif /* def __GLIBC__ */
|
|
|
|
#endif /* HAVE_POLL */
|
|
|
|
#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
|
|
|
|
|
|
|
|
const char gateway_h_rcs[] = GATEWAY_H_VERSION;
|
|
|
|
|
|
|
|
static jb_socket socks4_connect(const struct forward_spec * fwd,
|
|
|
|
const char * target_host,
|
|
|
|
int target_port,
|
|
|
|
struct client_state *csp);
|
|
|
|
|
|
|
|
static jb_socket socks5_connect(const struct forward_spec *fwd,
|
|
|
|
const char *target_host,
|
|
|
|
int target_port,
|
|
|
|
struct client_state *csp);
|
|
|
|
|
2012-06-28 03:17:49 +00:00
|
|
|
enum {
|
|
|
|
SOCKS4_REQUEST_GRANTED = 90,
|
|
|
|
SOCKS4_REQUEST_REJECT = 91,
|
|
|
|
SOCKS4_REQUEST_IDENT_FAILED = 92,
|
|
|
|
SOCKS4_REQUEST_IDENT_CONFLICT = 93
|
|
|
|
};
|
2012-05-03 18:32:18 +00:00
|
|
|
|
2012-06-28 03:17:49 +00:00
|
|
|
enum {
|
|
|
|
SOCKS5_REQUEST_GRANTED = 0,
|
|
|
|
SOCKS5_REQUEST_FAILED = 1,
|
|
|
|
SOCKS5_REQUEST_DENIED = 2,
|
|
|
|
SOCKS5_REQUEST_NETWORK_UNREACHABLE = 3,
|
|
|
|
SOCKS5_REQUEST_HOST_UNREACHABLE = 4,
|
|
|
|
SOCKS5_REQUEST_CONNECTION_REFUSED = 5,
|
|
|
|
SOCKS5_REQUEST_TTL_EXPIRED = 6,
|
|
|
|
SOCKS5_REQUEST_PROTOCOL_ERROR = 7,
|
|
|
|
SOCKS5_REQUEST_BAD_ADDRESS_TYPE = 8
|
|
|
|
};
|
2012-05-03 18:32:18 +00:00
|
|
|
|
|
|
|
/* structure of a socks client operation */
|
|
|
|
struct socks_op {
|
|
|
|
unsigned char vn; /* socks version number */
|
|
|
|
unsigned char cd; /* command code */
|
|
|
|
unsigned char dstport[2]; /* destination port */
|
|
|
|
unsigned char dstip[4]; /* destination address */
|
|
|
|
char userid; /* first byte of userid */
|
|
|
|
char padding[3]; /* make sure sizeof(struct socks_op) is endian-independent. */
|
|
|
|
/* more bytes of the userid follow, terminated by a NULL */
|
|
|
|
};
|
|
|
|
|
|
|
|
/* structure of a socks server reply */
|
|
|
|
struct socks_reply {
|
|
|
|
unsigned char vn; /* socks version number */
|
|
|
|
unsigned char cd; /* command code */
|
|
|
|
unsigned char dstport[2]; /* destination port */
|
|
|
|
unsigned char dstip[4]; /* destination address */
|
|
|
|
};
|
|
|
|
|
|
|
|
static const char socks_userid[] = "anonymous";
|
|
|
|
|
2012-06-28 03:17:49 +00:00
|
|
|
#ifdef FEATURE_CONNECTION_SHARING
|
2012-05-03 18:32:18 +00:00
|
|
|
|
|
|
|
#define MAX_REUSABLE_CONNECTIONS 100
|
2012-06-28 03:17:49 +00:00
|
|
|
static unsigned int keep_alive_timeout = DEFAULT_KEEP_ALIVE_TIMEOUT;
|
2012-05-03 18:32:18 +00:00
|
|
|
|
|
|
|
static struct reusable_connection reusable_connection[MAX_REUSABLE_CONNECTIONS];
|
2012-06-28 03:17:49 +00:00
|
|
|
static int mark_connection_unused(const struct reusable_connection *connection);
|
2012-05-03 18:32:18 +00:00
|
|
|
|
|
|
|
/*********************************************************************
|
|
|
|
*
|
|
|
|
* Function : initialize_reusable_connections
|
|
|
|
*
|
|
|
|
* Description : Initializes the reusable_connection structures.
|
|
|
|
* Must be called with connection_reuse_mutex locked.
|
|
|
|
*
|
|
|
|
* Parameters : N/A
|
|
|
|
*
|
|
|
|
* Returns : void
|
|
|
|
*
|
|
|
|
*********************************************************************/
|
|
|
|
extern void initialize_reusable_connections(void)
|
|
|
|
{
|
|
|
|
unsigned int slot = 0;
|
|
|
|
|
|
|
|
#if !defined(HAVE_POLL) && !defined(_WIN32)
|
|
|
|
log_error(LOG_LEVEL_INFO,
|
|
|
|
"Detecting already dead connections might not work "
|
|
|
|
"correctly on your platform. In case of problems, "
|
|
|
|
"unset the keep-alive-timeout option.");
|
|
|
|
#endif
|
|
|
|
|
|
|
|
for (slot = 0; slot < SZ(reusable_connection); slot++)
|
|
|
|
{
|
|
|
|
mark_connection_closed(&reusable_connection[slot]);
|
|
|
|
}
|
|
|
|
|
|
|
|
log_error(LOG_LEVEL_CONNECT, "Initialized %d socket slots.", slot);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*********************************************************************
|
|
|
|
*
|
|
|
|
* Function : remember_connection
|
|
|
|
*
|
2012-06-28 03:17:49 +00:00
|
|
|
* Description : Remembers a server connection for reuse later on.
|
2012-05-03 18:32:18 +00:00
|
|
|
*
|
|
|
|
* Parameters :
|
2012-06-28 03:17:49 +00:00
|
|
|
* 1 : connection = The server connection to remember.
|
2012-05-03 18:32:18 +00:00
|
|
|
*
|
|
|
|
* Returns : void
|
|
|
|
*
|
|
|
|
*********************************************************************/
|
2012-06-28 03:17:49 +00:00
|
|
|
void remember_connection(const struct reusable_connection *connection)
|
2012-05-03 18:32:18 +00:00
|
|
|
{
|
|
|
|
unsigned int slot = 0;
|
|
|
|
int free_slot_found = FALSE;
|
|
|
|
|
2012-06-28 03:17:49 +00:00
|
|
|
assert(NULL != connection);
|
|
|
|
assert(connection->sfd != JB_INVALID_SOCKET);
|
2012-05-03 18:32:18 +00:00
|
|
|
|
2012-06-28 03:17:49 +00:00
|
|
|
if (mark_connection_unused(connection))
|
2012-05-03 18:32:18 +00:00
|
|
|
{
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
privoxy_mutex_lock(&connection_reuse_mutex);
|
|
|
|
|
|
|
|
/* Find free socket slot. */
|
|
|
|
for (slot = 0; slot < SZ(reusable_connection); slot++)
|
|
|
|
{
|
|
|
|
if (reusable_connection[slot].sfd == JB_INVALID_SOCKET)
|
|
|
|
{
|
|
|
|
assert(reusable_connection[slot].in_use == 0);
|
|
|
|
log_error(LOG_LEVEL_CONNECT,
|
|
|
|
"Remembering socket %d for %s:%d in slot %d.",
|
2012-06-28 03:17:49 +00:00
|
|
|
connection->sfd, connection->host, connection->port, slot);
|
2012-05-03 18:32:18 +00:00
|
|
|
free_slot_found = TRUE;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!free_slot_found)
|
|
|
|
{
|
|
|
|
log_error(LOG_LEVEL_CONNECT,
|
|
|
|
"No free slots found to remembering socket for %s:%d. Last slot %d.",
|
2012-06-28 03:17:49 +00:00
|
|
|
connection->host, connection->port, slot);
|
2012-05-03 18:32:18 +00:00
|
|
|
privoxy_mutex_unlock(&connection_reuse_mutex);
|
2012-06-28 03:17:49 +00:00
|
|
|
close_socket(connection->sfd);
|
2012-05-03 18:32:18 +00:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2012-06-28 03:17:49 +00:00
|
|
|
assert(NULL != connection->host);
|
|
|
|
reusable_connection[slot].host = strdup(connection->host);
|
2012-05-03 18:32:18 +00:00
|
|
|
if (NULL == reusable_connection[slot].host)
|
|
|
|
{
|
|
|
|
log_error(LOG_LEVEL_FATAL, "Out of memory saving socket.");
|
|
|
|
}
|
2012-06-28 03:17:49 +00:00
|
|
|
reusable_connection[slot].sfd = connection->sfd;
|
|
|
|
reusable_connection[slot].port = connection->port;
|
2012-05-03 18:32:18 +00:00
|
|
|
reusable_connection[slot].in_use = 0;
|
2012-06-28 03:17:49 +00:00
|
|
|
reusable_connection[slot].timestamp = connection->timestamp;
|
|
|
|
reusable_connection->request_sent = connection->request_sent;
|
|
|
|
reusable_connection->response_received = connection->response_received;
|
|
|
|
reusable_connection[slot].keep_alive_timeout = connection->keep_alive_timeout;
|
2012-05-03 18:32:18 +00:00
|
|
|
|
|
|
|
assert(reusable_connection[slot].gateway_host == NULL);
|
|
|
|
assert(reusable_connection[slot].gateway_port == 0);
|
|
|
|
assert(reusable_connection[slot].forwarder_type == SOCKS_NONE);
|
|
|
|
assert(reusable_connection[slot].forward_host == NULL);
|
|
|
|
assert(reusable_connection[slot].forward_port == 0);
|
|
|
|
|
2012-06-28 03:17:49 +00:00
|
|
|
reusable_connection[slot].forwarder_type = connection->forwarder_type;
|
|
|
|
if (NULL != connection->gateway_host)
|
2012-05-03 18:32:18 +00:00
|
|
|
{
|
2012-06-28 03:17:49 +00:00
|
|
|
reusable_connection[slot].gateway_host = strdup(connection->gateway_host);
|
2012-05-03 18:32:18 +00:00
|
|
|
if (NULL == reusable_connection[slot].gateway_host)
|
|
|
|
{
|
|
|
|
log_error(LOG_LEVEL_FATAL, "Out of memory saving gateway_host.");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
reusable_connection[slot].gateway_host = NULL;
|
|
|
|
}
|
2012-06-28 03:17:49 +00:00
|
|
|
reusable_connection[slot].gateway_port = connection->gateway_port;
|
2012-05-03 18:32:18 +00:00
|
|
|
|
2012-06-28 03:17:49 +00:00
|
|
|
if (NULL != connection->forward_host)
|
2012-05-03 18:32:18 +00:00
|
|
|
{
|
2012-06-28 03:17:49 +00:00
|
|
|
reusable_connection[slot].forward_host = strdup(connection->forward_host);
|
2012-05-03 18:32:18 +00:00
|
|
|
if (NULL == reusable_connection[slot].forward_host)
|
|
|
|
{
|
|
|
|
log_error(LOG_LEVEL_FATAL, "Out of memory saving forward_host.");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
reusable_connection[slot].forward_host = NULL;
|
|
|
|
}
|
2012-06-28 03:17:49 +00:00
|
|
|
reusable_connection[slot].forward_port = connection->forward_port;
|
2012-05-03 18:32:18 +00:00
|
|
|
|
|
|
|
privoxy_mutex_unlock(&connection_reuse_mutex);
|
|
|
|
}
|
2012-06-28 03:17:49 +00:00
|
|
|
#endif /* def FEATURE_CONNECTION_SHARING */
|
2012-05-03 18:32:18 +00:00
|
|
|
|
|
|
|
|
2012-06-28 03:17:49 +00:00
|
|
|
#ifdef FEATURE_CONNECTION_KEEP_ALIVE
|
2012-05-03 18:32:18 +00:00
|
|
|
/*********************************************************************
|
|
|
|
*
|
|
|
|
* Function : mark_connection_closed
|
|
|
|
*
|
|
|
|
* Description : Marks a reused connection closed.
|
|
|
|
*
|
|
|
|
* Parameters :
|
|
|
|
* 1 : closed_connection = The connection to mark as closed.
|
|
|
|
*
|
|
|
|
* Returns : void
|
|
|
|
*
|
|
|
|
*********************************************************************/
|
2012-06-28 03:17:49 +00:00
|
|
|
void mark_connection_closed(struct reusable_connection *closed_connection)
|
2012-05-03 18:32:18 +00:00
|
|
|
{
|
|
|
|
closed_connection->in_use = FALSE;
|
|
|
|
closed_connection->sfd = JB_INVALID_SOCKET;
|
|
|
|
freez(closed_connection->host);
|
|
|
|
closed_connection->port = 0;
|
|
|
|
closed_connection->timestamp = 0;
|
2012-06-28 03:17:49 +00:00
|
|
|
closed_connection->request_sent = 0;
|
|
|
|
closed_connection->response_received = 0;
|
|
|
|
closed_connection->keep_alive_timeout = 0;
|
2012-05-03 18:32:18 +00:00
|
|
|
closed_connection->forwarder_type = SOCKS_NONE;
|
|
|
|
freez(closed_connection->gateway_host);
|
|
|
|
closed_connection->gateway_port = 0;
|
|
|
|
freez(closed_connection->forward_host);
|
|
|
|
closed_connection->forward_port = 0;
|
|
|
|
}
|
2012-06-28 03:17:49 +00:00
|
|
|
#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
|
2012-05-03 18:32:18 +00:00
|
|
|
|
|
|
|
|
2012-06-28 03:17:49 +00:00
|
|
|
#ifdef FEATURE_CONNECTION_SHARING
|
2012-05-03 18:32:18 +00:00
|
|
|
/*********************************************************************
|
|
|
|
*
|
|
|
|
* Function : forget_connection
|
|
|
|
*
|
|
|
|
* Description : Removes a previously remembered connection from
|
|
|
|
* the list of reusable connections.
|
|
|
|
*
|
|
|
|
* Parameters :
|
|
|
|
* 1 : sfd = The socket belonging to the connection in question.
|
|
|
|
*
|
|
|
|
* Returns : void
|
|
|
|
*
|
|
|
|
*********************************************************************/
|
|
|
|
void forget_connection(jb_socket sfd)
|
|
|
|
{
|
|
|
|
unsigned int slot = 0;
|
|
|
|
|
|
|
|
assert(sfd != JB_INVALID_SOCKET);
|
|
|
|
|
|
|
|
privoxy_mutex_lock(&connection_reuse_mutex);
|
|
|
|
|
|
|
|
for (slot = 0; slot < SZ(reusable_connection); slot++)
|
|
|
|
{
|
|
|
|
if (reusable_connection[slot].sfd == sfd)
|
|
|
|
{
|
|
|
|
assert(reusable_connection[slot].in_use);
|
|
|
|
|
|
|
|
log_error(LOG_LEVEL_CONNECT,
|
|
|
|
"Forgetting socket %d for %s:%d in slot %d.",
|
|
|
|
sfd, reusable_connection[slot].host,
|
|
|
|
reusable_connection[slot].port, slot);
|
|
|
|
mark_connection_closed(&reusable_connection[slot]);
|
2012-06-28 03:17:49 +00:00
|
|
|
break;
|
2012-05-03 18:32:18 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
privoxy_mutex_unlock(&connection_reuse_mutex);
|
2012-06-28 03:17:49 +00:00
|
|
|
|
2012-05-03 18:32:18 +00:00
|
|
|
}
|
2012-06-28 03:17:49 +00:00
|
|
|
#endif /* def FEATURE_CONNECTION_SHARING */
|
2012-05-03 18:32:18 +00:00
|
|
|
|
|
|
|
|
2012-06-28 03:17:49 +00:00
|
|
|
#ifdef FEATURE_CONNECTION_KEEP_ALIVE
|
2012-05-03 18:32:18 +00:00
|
|
|
/*********************************************************************
|
|
|
|
*
|
|
|
|
* Function : connection_destination_matches
|
|
|
|
*
|
|
|
|
* Description : Determines whether a remembered connection can
|
|
|
|
* be reused. That is, whether the destination and
|
|
|
|
* the forwarding settings match.
|
|
|
|
*
|
|
|
|
* Parameters :
|
|
|
|
* 1 : connection = The connection to check.
|
|
|
|
* 2 : http = The destination for the connection.
|
|
|
|
* 3 : fwd = The forwarder settings.
|
|
|
|
*
|
|
|
|
* Returns : TRUE for yes, FALSE otherwise.
|
|
|
|
*
|
|
|
|
*********************************************************************/
|
2012-06-28 03:17:49 +00:00
|
|
|
int connection_destination_matches(const struct reusable_connection *connection,
|
|
|
|
const struct http_request *http,
|
|
|
|
const struct forward_spec *fwd)
|
2012-05-03 18:32:18 +00:00
|
|
|
{
|
|
|
|
if ((connection->forwarder_type != fwd->type)
|
|
|
|
|| (connection->gateway_port != fwd->gateway_port)
|
|
|
|
|| (connection->forward_port != fwd->forward_port)
|
|
|
|
|| (connection->port != http->port))
|
|
|
|
{
|
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (( (NULL != connection->gateway_host)
|
|
|
|
&& (NULL != fwd->gateway_host)
|
|
|
|
&& strcmpic(connection->gateway_host, fwd->gateway_host))
|
|
|
|
&& (connection->gateway_host != fwd->gateway_host))
|
|
|
|
{
|
2012-06-28 03:17:49 +00:00
|
|
|
log_error(LOG_LEVEL_CONNECT,
|
|
|
|
"Gateway mismatch. Previous gateway: %s. Current gateway: %s",
|
|
|
|
connection->gateway_host, fwd->gateway_host);
|
2012-05-03 18:32:18 +00:00
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (( (NULL != connection->forward_host)
|
|
|
|
&& (NULL != fwd->forward_host)
|
|
|
|
&& strcmpic(connection->forward_host, fwd->forward_host))
|
|
|
|
&& (connection->forward_host != fwd->forward_host))
|
|
|
|
{
|
2012-06-28 03:17:49 +00:00
|
|
|
log_error(LOG_LEVEL_CONNECT,
|
|
|
|
"Forwarding proxy mismatch. Previous proxy: %s. Current proxy: %s",
|
|
|
|
connection->forward_host, fwd->forward_host);
|
2012-05-03 18:32:18 +00:00
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
|
|
|
|
return (!strcmpic(connection->host, http->host));
|
|
|
|
|
|
|
|
}
|
2012-06-28 03:17:49 +00:00
|
|
|
#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
|
2012-05-03 18:32:18 +00:00
|
|
|
|
|
|
|
|
2012-06-28 03:17:49 +00:00
|
|
|
#ifdef FEATURE_CONNECTION_SHARING
|
2012-05-03 18:32:18 +00:00
|
|
|
/*********************************************************************
|
|
|
|
*
|
|
|
|
* Function : close_unusable_connections
|
|
|
|
*
|
|
|
|
* Description : Closes remembered connections that have timed
|
|
|
|
* out or have been closed on the other side.
|
|
|
|
*
|
|
|
|
* Parameters : none
|
|
|
|
*
|
|
|
|
* Returns : Number of connections that are still alive.
|
|
|
|
*
|
|
|
|
*********************************************************************/
|
|
|
|
int close_unusable_connections(void)
|
|
|
|
{
|
|
|
|
unsigned int slot = 0;
|
|
|
|
int connections_alive = 0;
|
|
|
|
|
|
|
|
privoxy_mutex_lock(&connection_reuse_mutex);
|
|
|
|
|
|
|
|
for (slot = 0; slot < SZ(reusable_connection); slot++)
|
|
|
|
{
|
|
|
|
if (!reusable_connection[slot].in_use
|
|
|
|
&& (JB_INVALID_SOCKET != reusable_connection[slot].sfd))
|
|
|
|
{
|
|
|
|
time_t time_open = time(NULL) - reusable_connection[slot].timestamp;
|
2012-06-28 03:17:49 +00:00
|
|
|
time_t latency = (reusable_connection[slot].response_received -
|
|
|
|
reusable_connection[slot].request_sent) / 2;
|
2012-05-03 18:32:18 +00:00
|
|
|
|
2012-06-28 03:17:49 +00:00
|
|
|
if (reusable_connection[slot].keep_alive_timeout < time_open + latency)
|
2012-05-03 18:32:18 +00:00
|
|
|
{
|
|
|
|
log_error(LOG_LEVEL_CONNECT,
|
|
|
|
"The connection to %s:%d in slot %d timed out. "
|
2012-06-28 03:17:49 +00:00
|
|
|
"Closing socket %d. Timeout is: %d. Assumed latency: %d.",
|
2012-05-03 18:32:18 +00:00
|
|
|
reusable_connection[slot].host,
|
|
|
|
reusable_connection[slot].port, slot,
|
2012-06-28 03:17:49 +00:00
|
|
|
reusable_connection[slot].sfd,
|
|
|
|
reusable_connection[slot].keep_alive_timeout,
|
|
|
|
latency);
|
2012-05-03 18:32:18 +00:00
|
|
|
close_socket(reusable_connection[slot].sfd);
|
|
|
|
mark_connection_closed(&reusable_connection[slot]);
|
|
|
|
}
|
2012-06-28 03:17:49 +00:00
|
|
|
else if (!socket_is_still_alive(reusable_connection[slot].sfd))
|
2012-05-03 18:32:18 +00:00
|
|
|
{
|
|
|
|
log_error(LOG_LEVEL_CONNECT,
|
|
|
|
"The connection to %s:%d in slot %d is no longer usable. "
|
|
|
|
"Closing socket %d.", reusable_connection[slot].host,
|
|
|
|
reusable_connection[slot].port, slot,
|
|
|
|
reusable_connection[slot].sfd);
|
|
|
|
close_socket(reusable_connection[slot].sfd);
|
|
|
|
mark_connection_closed(&reusable_connection[slot]);
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
connections_alive++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
privoxy_mutex_unlock(&connection_reuse_mutex);
|
|
|
|
|
|
|
|
return connections_alive;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*********************************************************************
|
|
|
|
*
|
|
|
|
* Function : get_reusable_connection
|
|
|
|
*
|
|
|
|
* Description : Returns an open socket to a previously remembered
|
|
|
|
* open connection (if there is one).
|
|
|
|
*
|
|
|
|
* Parameters :
|
|
|
|
* 1 : http = The destination for the connection.
|
|
|
|
* 2 : fwd = The forwarder settings.
|
|
|
|
*
|
|
|
|
* Returns : JB_INVALID_SOCKET => No reusable connection found,
|
|
|
|
* otherwise a usable socket.
|
|
|
|
*
|
|
|
|
*********************************************************************/
|
|
|
|
static jb_socket get_reusable_connection(const struct http_request *http,
|
|
|
|
const struct forward_spec *fwd)
|
|
|
|
{
|
|
|
|
jb_socket sfd = JB_INVALID_SOCKET;
|
|
|
|
unsigned int slot = 0;
|
|
|
|
|
|
|
|
close_unusable_connections();
|
|
|
|
|
|
|
|
privoxy_mutex_lock(&connection_reuse_mutex);
|
|
|
|
|
|
|
|
for (slot = 0; slot < SZ(reusable_connection); slot++)
|
|
|
|
{
|
|
|
|
if (!reusable_connection[slot].in_use
|
|
|
|
&& (JB_INVALID_SOCKET != reusable_connection[slot].sfd))
|
|
|
|
{
|
|
|
|
if (connection_destination_matches(&reusable_connection[slot], http, fwd))
|
|
|
|
{
|
|
|
|
reusable_connection[slot].in_use = TRUE;
|
|
|
|
sfd = reusable_connection[slot].sfd;
|
|
|
|
log_error(LOG_LEVEL_CONNECT,
|
2012-06-28 03:17:49 +00:00
|
|
|
"Found reusable socket %d for %s:%d in slot %d. "
|
|
|
|
"Timestamp made %d seconds ago. Timeout: %d. Latency: %d.",
|
|
|
|
sfd, reusable_connection[slot].host, reusable_connection[slot].port,
|
|
|
|
slot, time(NULL) - reusable_connection[slot].timestamp,
|
|
|
|
reusable_connection[slot].keep_alive_timeout,
|
|
|
|
(int)(reusable_connection[slot].response_received -
|
|
|
|
reusable_connection[slot].request_sent));
|
2012-05-03 18:32:18 +00:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
privoxy_mutex_unlock(&connection_reuse_mutex);
|
|
|
|
|
|
|
|
return sfd;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*********************************************************************
|
|
|
|
*
|
|
|
|
* Function : mark_connection_unused
|
|
|
|
*
|
|
|
|
* Description : Gives a remembered connection free for reuse.
|
|
|
|
*
|
|
|
|
* Parameters :
|
2012-06-28 03:17:49 +00:00
|
|
|
* 1 : connection = The connection in question.
|
2012-05-03 18:32:18 +00:00
|
|
|
*
|
|
|
|
* Returns : TRUE => Socket found and marked as unused.
|
|
|
|
* FALSE => Socket not found.
|
|
|
|
*
|
|
|
|
*********************************************************************/
|
2012-06-28 03:17:49 +00:00
|
|
|
static int mark_connection_unused(const struct reusable_connection *connection)
|
2012-05-03 18:32:18 +00:00
|
|
|
{
|
|
|
|
unsigned int slot = 0;
|
|
|
|
int socket_found = FALSE;
|
|
|
|
|
2012-06-28 03:17:49 +00:00
|
|
|
assert(connection->sfd != JB_INVALID_SOCKET);
|
2012-05-03 18:32:18 +00:00
|
|
|
|
|
|
|
privoxy_mutex_lock(&connection_reuse_mutex);
|
|
|
|
|
|
|
|
for (slot = 0; slot < SZ(reusable_connection); slot++)
|
|
|
|
{
|
2012-06-28 03:17:49 +00:00
|
|
|
if (reusable_connection[slot].sfd == connection->sfd)
|
2012-05-03 18:32:18 +00:00
|
|
|
{
|
|
|
|
assert(reusable_connection[slot].in_use);
|
|
|
|
socket_found = TRUE;
|
|
|
|
log_error(LOG_LEVEL_CONNECT,
|
|
|
|
"Marking open socket %d for %s:%d in slot %d as unused.",
|
2012-06-28 03:17:49 +00:00
|
|
|
connection->sfd, reusable_connection[slot].host,
|
2012-05-03 18:32:18 +00:00
|
|
|
reusable_connection[slot].port, slot);
|
|
|
|
reusable_connection[slot].in_use = 0;
|
2012-06-28 03:17:49 +00:00
|
|
|
reusable_connection[slot].timestamp = connection->timestamp;
|
2012-05-03 18:32:18 +00:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
privoxy_mutex_unlock(&connection_reuse_mutex);
|
|
|
|
|
|
|
|
return socket_found;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*********************************************************************
|
|
|
|
*
|
|
|
|
* Function : set_keep_alive_timeout
|
|
|
|
*
|
|
|
|
* Description : Sets the timeout after which open
|
|
|
|
* connections will no longer be reused.
|
|
|
|
*
|
|
|
|
* Parameters :
|
|
|
|
* 1 : timeout = The timeout in seconds.
|
|
|
|
*
|
|
|
|
* Returns : void
|
|
|
|
*
|
|
|
|
*********************************************************************/
|
2012-06-28 03:17:49 +00:00
|
|
|
void set_keep_alive_timeout(unsigned int timeout)
|
2012-05-03 18:32:18 +00:00
|
|
|
{
|
|
|
|
keep_alive_timeout = timeout;
|
|
|
|
}
|
2012-06-28 03:17:49 +00:00
|
|
|
#endif /* def FEATURE_CONNECTION_SHARING */
|
2012-05-03 18:32:18 +00:00
|
|
|
|
|
|
|
|
|
|
|
/*********************************************************************
|
|
|
|
*
|
|
|
|
* Function : forwarded_connect
|
|
|
|
*
|
|
|
|
* Description : Connect to a specified web server, possibly via
|
|
|
|
* a HTTP proxy and/or a SOCKS proxy.
|
|
|
|
*
|
|
|
|
* Parameters :
|
|
|
|
* 1 : fwd = the proxies to use when connecting.
|
|
|
|
* 2 : http = the http request and apropos headers
|
|
|
|
* 3 : csp = Current client state (buffers, headers, etc...)
|
|
|
|
*
|
|
|
|
* Returns : JB_INVALID_SOCKET => failure, else it is the socket file descriptor.
|
|
|
|
*
|
|
|
|
*********************************************************************/
|
|
|
|
jb_socket forwarded_connect(const struct forward_spec * fwd,
|
|
|
|
struct http_request *http,
|
|
|
|
struct client_state *csp)
|
|
|
|
{
|
|
|
|
const char * dest_host;
|
|
|
|
int dest_port;
|
|
|
|
jb_socket sfd = JB_INVALID_SOCKET;
|
|
|
|
|
2012-06-28 03:17:49 +00:00
|
|
|
#ifdef FEATURE_CONNECTION_SHARING
|
|
|
|
if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING)
|
|
|
|
&& !(csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED))
|
2012-05-03 18:32:18 +00:00
|
|
|
{
|
2012-06-28 03:17:49 +00:00
|
|
|
sfd = get_reusable_connection(http, fwd);
|
|
|
|
if (JB_INVALID_SOCKET != sfd)
|
|
|
|
{
|
|
|
|
return sfd;
|
|
|
|
}
|
2012-05-03 18:32:18 +00:00
|
|
|
}
|
2012-06-28 03:17:49 +00:00
|
|
|
#endif /* def FEATURE_CONNECTION_SHARING */
|
2012-05-03 18:32:18 +00:00
|
|
|
|
|
|
|
/* Figure out if we need to connect to the web server or a HTTP proxy. */
|
|
|
|
if (fwd->forward_host)
|
|
|
|
{
|
|
|
|
/* HTTP proxy */
|
|
|
|
dest_host = fwd->forward_host;
|
|
|
|
dest_port = fwd->forward_port;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
/* Web server */
|
|
|
|
dest_host = http->host;
|
|
|
|
dest_port = http->port;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Connect, maybe using a SOCKS proxy */
|
|
|
|
switch (fwd->type)
|
|
|
|
{
|
|
|
|
case SOCKS_NONE:
|
|
|
|
sfd = connect_to(dest_host, dest_port, csp);
|
|
|
|
break;
|
|
|
|
case SOCKS_4:
|
|
|
|
case SOCKS_4A:
|
|
|
|
sfd = socks4_connect(fwd, dest_host, dest_port, csp);
|
|
|
|
break;
|
|
|
|
case SOCKS_5:
|
|
|
|
sfd = socks5_connect(fwd, dest_host, dest_port, csp);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
/* Should never get here */
|
|
|
|
log_error(LOG_LEVEL_FATAL,
|
2012-06-28 03:17:49 +00:00
|
|
|
"Internal error in forwarded_connect(). Bad proxy type: %d", fwd->type);
|
2012-05-03 18:32:18 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
if (JB_INVALID_SOCKET != sfd)
|
|
|
|
{
|
|
|
|
log_error(LOG_LEVEL_CONNECT,
|
|
|
|
"Created new connection to %s:%d on socket %d.",
|
|
|
|
http->host, http->port, sfd);
|
|
|
|
}
|
|
|
|
|
|
|
|
return sfd;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*********************************************************************
|
|
|
|
*
|
|
|
|
* Function : socks4_connect
|
|
|
|
*
|
|
|
|
* Description : Connect to the SOCKS server, and connect through
|
|
|
|
* it to the specified server. This handles
|
|
|
|
* all the SOCKS negotiation, and returns a file
|
|
|
|
* descriptor for a socket which can be treated as a
|
|
|
|
* normal (non-SOCKS) socket.
|
|
|
|
*
|
|
|
|
* Logged error messages are saved to csp->error_message
|
|
|
|
* and later reused by error_response() for the CGI
|
|
|
|
* message. strdup allocation failures are handled there.
|
|
|
|
*
|
|
|
|
* Parameters :
|
|
|
|
* 1 : fwd = Specifies the SOCKS proxy to use.
|
|
|
|
* 2 : target_host = The final server to connect to.
|
|
|
|
* 3 : target_port = The final port to connect to.
|
|
|
|
* 4 : csp = Current client state (buffers, headers, etc...)
|
|
|
|
*
|
|
|
|
* Returns : JB_INVALID_SOCKET => failure, else a socket file descriptor.
|
|
|
|
*
|
|
|
|
*********************************************************************/
|
|
|
|
static jb_socket socks4_connect(const struct forward_spec * fwd,
|
|
|
|
const char * target_host,
|
|
|
|
int target_port,
|
|
|
|
struct client_state *csp)
|
|
|
|
{
|
2012-06-28 03:17:49 +00:00
|
|
|
unsigned long web_server_addr;
|
2012-05-03 18:32:18 +00:00
|
|
|
char buf[BUFFER_SIZE];
|
|
|
|
struct socks_op *c = (struct socks_op *)buf;
|
|
|
|
struct socks_reply *s = (struct socks_reply *)buf;
|
|
|
|
size_t n;
|
|
|
|
size_t csiz;
|
|
|
|
jb_socket sfd;
|
|
|
|
int err = 0;
|
|
|
|
char *errstr = NULL;
|
|
|
|
|
|
|
|
if ((fwd->gateway_host == NULL) || (*fwd->gateway_host == '\0'))
|
|
|
|
{
|
|
|
|
/* XXX: Shouldn't the config file parser prevent this? */
|
|
|
|
errstr = "NULL gateway host specified.";
|
|
|
|
err = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (fwd->gateway_port <= 0)
|
|
|
|
{
|
|
|
|
errstr = "invalid gateway port specified.";
|
|
|
|
err = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (err)
|
|
|
|
{
|
|
|
|
log_error(LOG_LEVEL_CONNECT, "socks4_connect: %s", errstr);
|
2012-06-28 03:17:49 +00:00
|
|
|
csp->error_message = strdup(errstr);
|
2012-05-03 18:32:18 +00:00
|
|
|
errno = EINVAL;
|
|
|
|
return(JB_INVALID_SOCKET);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* build a socks request for connection to the web server */
|
|
|
|
|
|
|
|
strlcpy(&(c->userid), socks_userid, sizeof(buf) - sizeof(struct socks_op));
|
|
|
|
|
|
|
|
csiz = sizeof(*c) + sizeof(socks_userid) - sizeof(c->userid) - sizeof(c->padding);
|
|
|
|
|
|
|
|
switch (fwd->type)
|
|
|
|
{
|
|
|
|
case SOCKS_4:
|
|
|
|
web_server_addr = resolve_hostname_to_ip(target_host);
|
|
|
|
if (web_server_addr == INADDR_NONE)
|
|
|
|
{
|
|
|
|
errstr = "could not resolve target host";
|
|
|
|
log_error(LOG_LEVEL_CONNECT, "socks4_connect: %s %s", errstr, target_host);
|
|
|
|
err = 1;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
web_server_addr = htonl(web_server_addr);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case SOCKS_4A:
|
|
|
|
web_server_addr = 0x00000001;
|
|
|
|
n = csiz + strlen(target_host) + 1;
|
|
|
|
if (n > sizeof(buf))
|
|
|
|
{
|
|
|
|
errno = EINVAL;
|
|
|
|
errstr = "buffer cbuf too small.";
|
|
|
|
log_error(LOG_LEVEL_CONNECT, "socks4_connect: %s", errstr);
|
|
|
|
err = 1;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
strlcpy(buf + csiz, target_host, sizeof(buf) - sizeof(struct socks_op) - csiz);
|
|
|
|
/*
|
|
|
|
* What we forward to the socks4a server should have the
|
|
|
|
* size of socks_op, plus the length of the userid plus
|
|
|
|
* its \0 byte (which we don't have to add because the
|
|
|
|
* first byte of the userid is counted twice as it's also
|
|
|
|
* part of sock_op) minus the padding bytes (which are part
|
|
|
|
* of the userid as well), plus the length of the target_host
|
|
|
|
* (which is stored csiz bytes after the beginning of the buffer),
|
|
|
|
* plus another \0 byte.
|
|
|
|
*/
|
|
|
|
assert(n == sizeof(struct socks_op) + strlen(&(c->userid)) - sizeof(c->padding) + strlen(buf + csiz) + 1);
|
|
|
|
csiz = n;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
/* Should never get here */
|
|
|
|
log_error(LOG_LEVEL_FATAL,
|
|
|
|
"socks4_connect: SOCKS4 impossible internal error - bad SOCKS type.");
|
|
|
|
/* Not reached */
|
|
|
|
return(JB_INVALID_SOCKET);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (err)
|
|
|
|
{
|
|
|
|
csp->error_message = strdup(errstr);
|
|
|
|
return(JB_INVALID_SOCKET);
|
|
|
|
}
|
|
|
|
|
|
|
|
c->vn = 4;
|
|
|
|
c->cd = 1;
|
|
|
|
c->dstport[0] = (unsigned char)((target_port >> 8 ) & 0xff);
|
|
|
|
c->dstport[1] = (unsigned char)((target_port ) & 0xff);
|
|
|
|
c->dstip[0] = (unsigned char)((web_server_addr >> 24 ) & 0xff);
|
|
|
|
c->dstip[1] = (unsigned char)((web_server_addr >> 16 ) & 0xff);
|
|
|
|
c->dstip[2] = (unsigned char)((web_server_addr >> 8 ) & 0xff);
|
|
|
|
c->dstip[3] = (unsigned char)((web_server_addr ) & 0xff);
|
|
|
|
|
|
|
|
/* pass the request to the socks server */
|
|
|
|
sfd = connect_to(fwd->gateway_host, fwd->gateway_port, csp);
|
|
|
|
|
|
|
|
if (sfd == JB_INVALID_SOCKET)
|
|
|
|
{
|
2012-06-28 03:17:49 +00:00
|
|
|
/* The error an its reason have already been logged by connect_to() */
|
|
|
|
return(JB_INVALID_SOCKET);
|
2012-05-03 18:32:18 +00:00
|
|
|
}
|
|
|
|
else if (write_socket(sfd, (char *)c, csiz))
|
|
|
|
{
|
|
|
|
errstr = "SOCKS4 negotiation write failed.";
|
|
|
|
log_error(LOG_LEVEL_CONNECT, "socks4_connect: %s", errstr);
|
|
|
|
err = 1;
|
|
|
|
close_socket(sfd);
|
|
|
|
}
|
2012-06-28 03:17:49 +00:00
|
|
|
else if (!data_is_available(sfd, csp->config->socket_timeout))
|
|
|
|
{
|
|
|
|
if (socket_is_still_alive(sfd))
|
|
|
|
{
|
|
|
|
errstr = "SOCKS4 negotiation timed out";
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
errstr = "SOCKS4 negotiation got aborted by the server";
|
|
|
|
}
|
|
|
|
log_error(LOG_LEVEL_CONNECT, "socks4_connect: %s", errstr);
|
|
|
|
err = 1;
|
|
|
|
close_socket(sfd);
|
|
|
|
}
|
2012-05-03 18:32:18 +00:00
|
|
|
else if (read_socket(sfd, buf, sizeof(buf)) != sizeof(*s))
|
|
|
|
{
|
|
|
|
errstr = "SOCKS4 negotiation read failed.";
|
|
|
|
log_error(LOG_LEVEL_CONNECT, "socks4_connect: %s", errstr);
|
|
|
|
err = 1;
|
|
|
|
close_socket(sfd);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (err)
|
|
|
|
{
|
2012-06-28 03:17:49 +00:00
|
|
|
csp->error_message = strdup(errstr);
|
2012-05-03 18:32:18 +00:00
|
|
|
return(JB_INVALID_SOCKET);
|
|
|
|
}
|
|
|
|
|
|
|
|
switch (s->cd)
|
|
|
|
{
|
2012-06-28 03:17:49 +00:00
|
|
|
case SOCKS4_REQUEST_GRANTED:
|
2012-05-03 18:32:18 +00:00
|
|
|
return(sfd);
|
2012-06-28 03:17:49 +00:00
|
|
|
case SOCKS4_REQUEST_REJECT:
|
2012-05-03 18:32:18 +00:00
|
|
|
errstr = "SOCKS request rejected or failed.";
|
|
|
|
errno = EINVAL;
|
|
|
|
break;
|
2012-06-28 03:17:49 +00:00
|
|
|
case SOCKS4_REQUEST_IDENT_FAILED:
|
2012-05-03 18:32:18 +00:00
|
|
|
errstr = "SOCKS request rejected because "
|
|
|
|
"SOCKS server cannot connect to identd on the client.";
|
|
|
|
errno = EACCES;
|
|
|
|
break;
|
2012-06-28 03:17:49 +00:00
|
|
|
case SOCKS4_REQUEST_IDENT_CONFLICT:
|
2012-05-03 18:32:18 +00:00
|
|
|
errstr = "SOCKS request rejected because "
|
|
|
|
"the client program and identd report "
|
|
|
|
"different user-ids.";
|
|
|
|
errno = EACCES;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
errno = ENOENT;
|
|
|
|
snprintf(buf, sizeof(buf),
|
|
|
|
"SOCKS request rejected for reason code %d.", s->cd);
|
|
|
|
errstr = buf;
|
|
|
|
}
|
|
|
|
|
|
|
|
log_error(LOG_LEVEL_CONNECT, "socks4_connect: %s", errstr);
|
|
|
|
csp->error_message = strdup(errstr);
|
|
|
|
close_socket(sfd);
|
|
|
|
|
|
|
|
return(JB_INVALID_SOCKET);
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
/*********************************************************************
|
|
|
|
*
|
|
|
|
* Function : translate_socks5_error
|
|
|
|
*
|
|
|
|
* Description : Translates a SOCKS errors to a string.
|
|
|
|
*
|
|
|
|
* Parameters :
|
|
|
|
* 1 : socks_error = The error code to translate.
|
|
|
|
*
|
|
|
|
* Returns : The string translation.
|
|
|
|
*
|
|
|
|
*********************************************************************/
|
|
|
|
static const char *translate_socks5_error(int socks_error)
|
|
|
|
{
|
|
|
|
switch (socks_error)
|
|
|
|
{
|
|
|
|
/* XXX: these should be more descriptive */
|
|
|
|
case SOCKS5_REQUEST_FAILED:
|
|
|
|
return "SOCKS5 request failed";
|
|
|
|
case SOCKS5_REQUEST_DENIED:
|
|
|
|
return "SOCKS5 request denied";
|
|
|
|
case SOCKS5_REQUEST_NETWORK_UNREACHABLE:
|
|
|
|
return "SOCKS5 network unreachable";
|
|
|
|
case SOCKS5_REQUEST_HOST_UNREACHABLE:
|
|
|
|
return "SOCKS5 host unreachable";
|
|
|
|
case SOCKS5_REQUEST_CONNECTION_REFUSED:
|
|
|
|
return "SOCKS5 connection refused";
|
|
|
|
case SOCKS5_REQUEST_TTL_EXPIRED:
|
|
|
|
return "SOCKS5 TTL expired";
|
|
|
|
case SOCKS5_REQUEST_PROTOCOL_ERROR:
|
|
|
|
return "SOCKS5 client protocol error";
|
|
|
|
case SOCKS5_REQUEST_BAD_ADDRESS_TYPE:
|
|
|
|
return "SOCKS5 domain names unsupported";
|
|
|
|
case SOCKS5_REQUEST_GRANTED:
|
|
|
|
return "everything's peachy";
|
|
|
|
default:
|
|
|
|
return "SOCKS5 negotiation protocol error";
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*********************************************************************
|
|
|
|
*
|
|
|
|
* Function : socks5_connect
|
|
|
|
*
|
|
|
|
* Description : Connect to the SOCKS server, and connect through
|
|
|
|
* it to the specified server. This handles
|
|
|
|
* all the SOCKS negotiation, and returns a file
|
|
|
|
* descriptor for a socket which can be treated as a
|
|
|
|
* normal (non-SOCKS) socket.
|
|
|
|
*
|
|
|
|
* Parameters :
|
|
|
|
* 1 : fwd = Specifies the SOCKS proxy to use.
|
|
|
|
* 2 : target_host = The final server to connect to.
|
|
|
|
* 3 : target_port = The final port to connect to.
|
|
|
|
* 4 : csp = Current client state (buffers, headers, etc...)
|
|
|
|
*
|
|
|
|
* Returns : JB_INVALID_SOCKET => failure, else a socket file descriptor.
|
|
|
|
*
|
|
|
|
*********************************************************************/
|
|
|
|
static jb_socket socks5_connect(const struct forward_spec *fwd,
|
|
|
|
const char *target_host,
|
|
|
|
int target_port,
|
|
|
|
struct client_state *csp)
|
|
|
|
{
|
|
|
|
int err = 0;
|
|
|
|
char cbuf[300];
|
2012-06-28 03:17:49 +00:00
|
|
|
char sbuf[10];
|
2012-05-03 18:32:18 +00:00
|
|
|
size_t client_pos = 0;
|
|
|
|
int server_size = 0;
|
|
|
|
size_t hostlen = 0;
|
|
|
|
jb_socket sfd;
|
|
|
|
const char *errstr = NULL;
|
|
|
|
|
|
|
|
assert(fwd->gateway_host);
|
|
|
|
if ((fwd->gateway_host == NULL) || (*fwd->gateway_host == '\0'))
|
|
|
|
{
|
|
|
|
errstr = "NULL gateway host specified";
|
|
|
|
err = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (fwd->gateway_port <= 0)
|
|
|
|
{
|
|
|
|
/*
|
|
|
|
* XXX: currently this can't happen because in
|
|
|
|
* case of invalid gateway ports we use the defaults.
|
|
|
|
* Of course we really shouldn't do that.
|
|
|
|
*/
|
|
|
|
errstr = "invalid gateway port specified";
|
|
|
|
err = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
hostlen = strlen(target_host);
|
|
|
|
if (hostlen > (size_t)255)
|
|
|
|
{
|
|
|
|
errstr = "target host name is longer than 255 characters";
|
|
|
|
err = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (fwd->type != SOCKS_5)
|
|
|
|
{
|
|
|
|
/* Should never get here */
|
|
|
|
log_error(LOG_LEVEL_FATAL,
|
|
|
|
"SOCKS5 impossible internal error - bad SOCKS type");
|
|
|
|
err = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (err)
|
|
|
|
{
|
|
|
|
errno = EINVAL;
|
|
|
|
assert(errstr != NULL);
|
|
|
|
log_error(LOG_LEVEL_CONNECT, "socks5_connect: %s", errstr);
|
|
|
|
csp->error_message = strdup(errstr);
|
|
|
|
return(JB_INVALID_SOCKET);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* pass the request to the socks server */
|
|
|
|
sfd = connect_to(fwd->gateway_host, fwd->gateway_port, csp);
|
|
|
|
|
|
|
|
if (sfd == JB_INVALID_SOCKET)
|
|
|
|
{
|
|
|
|
errstr = "socks5 server unreachable";
|
|
|
|
log_error(LOG_LEVEL_CONNECT, "socks5_connect: %s", errstr);
|
2012-06-28 03:17:49 +00:00
|
|
|
/* Free the generic error message provided by connect_to() */
|
|
|
|
freez(csp->error_message);
|
2012-05-03 18:32:18 +00:00
|
|
|
csp->error_message = strdup(errstr);
|
|
|
|
return(JB_INVALID_SOCKET);
|
|
|
|
}
|
|
|
|
|
|
|
|
client_pos = 0;
|
|
|
|
cbuf[client_pos++] = '\x05'; /* Version */
|
|
|
|
cbuf[client_pos++] = '\x01'; /* One authentication method supported */
|
|
|
|
cbuf[client_pos++] = '\x00'; /* The no authentication authentication method */
|
|
|
|
|
|
|
|
if (write_socket(sfd, cbuf, client_pos))
|
|
|
|
{
|
|
|
|
errstr = "SOCKS5 negotiation write failed";
|
|
|
|
csp->error_message = strdup(errstr);
|
|
|
|
log_error(LOG_LEVEL_CONNECT, "%s", errstr);
|
|
|
|
close_socket(sfd);
|
|
|
|
return(JB_INVALID_SOCKET);
|
|
|
|
}
|
|
|
|
|
2012-06-28 03:17:49 +00:00
|
|
|
if (!data_is_available(sfd, csp->config->socket_timeout))
|
|
|
|
{
|
|
|
|
if (socket_is_still_alive(sfd))
|
|
|
|
{
|
|
|
|
errstr = "SOCKS5 negotiation timed out";
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
errstr = "SOCKS5 negotiation got aborted by the server";
|
|
|
|
}
|
|
|
|
err = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!err && read_socket(sfd, sbuf, sizeof(sbuf)) != 2)
|
2012-05-03 18:32:18 +00:00
|
|
|
{
|
|
|
|
errstr = "SOCKS5 negotiation read failed";
|
|
|
|
err = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!err && (sbuf[0] != '\x05'))
|
|
|
|
{
|
|
|
|
errstr = "SOCKS5 negotiation protocol version error";
|
|
|
|
err = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!err && (sbuf[1] == '\xff'))
|
|
|
|
{
|
|
|
|
errstr = "SOCKS5 authentication required";
|
|
|
|
err = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!err && (sbuf[1] != '\x00'))
|
|
|
|
{
|
|
|
|
errstr = "SOCKS5 negotiation protocol error";
|
|
|
|
err = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (err)
|
|
|
|
{
|
|
|
|
assert(errstr != NULL);
|
|
|
|
log_error(LOG_LEVEL_CONNECT, "socks5_connect: %s", errstr);
|
|
|
|
csp->error_message = strdup(errstr);
|
|
|
|
close_socket(sfd);
|
|
|
|
errno = EINVAL;
|
|
|
|
return(JB_INVALID_SOCKET);
|
|
|
|
}
|
|
|
|
|
|
|
|
client_pos = 0;
|
|
|
|
cbuf[client_pos++] = '\x05'; /* Version */
|
|
|
|
cbuf[client_pos++] = '\x01'; /* TCP connect */
|
|
|
|
cbuf[client_pos++] = '\x00'; /* Reserved, must be 0x00 */
|
|
|
|
cbuf[client_pos++] = '\x03'; /* Address is domain name */
|
|
|
|
cbuf[client_pos++] = (char)(hostlen & 0xffu);
|
|
|
|
assert(sizeof(cbuf) - client_pos > (size_t)255);
|
|
|
|
/* Using strncpy because we really want the nul byte padding. */
|
|
|
|
strncpy(cbuf + client_pos, target_host, sizeof(cbuf) - client_pos);
|
|
|
|
client_pos += (hostlen & 0xffu);
|
|
|
|
cbuf[client_pos++] = (char)((target_port >> 8) & 0xff);
|
|
|
|
cbuf[client_pos++] = (char)((target_port ) & 0xff);
|
|
|
|
|
|
|
|
if (write_socket(sfd, cbuf, client_pos))
|
|
|
|
{
|
2012-06-28 03:17:49 +00:00
|
|
|
errstr = "SOCKS5 negotiation write failed";
|
2012-05-03 18:32:18 +00:00
|
|
|
csp->error_message = strdup(errstr);
|
|
|
|
log_error(LOG_LEVEL_CONNECT, "%s", errstr);
|
|
|
|
close_socket(sfd);
|
|
|
|
errno = EINVAL;
|
|
|
|
return(JB_INVALID_SOCKET);
|
|
|
|
}
|
|
|
|
|
|
|
|
server_size = read_socket(sfd, sbuf, sizeof(sbuf));
|
2012-06-28 03:17:49 +00:00
|
|
|
if (server_size != sizeof(sbuf))
|
2012-05-03 18:32:18 +00:00
|
|
|
{
|
|
|
|
errstr = "SOCKS5 negotiation read failed";
|
|
|
|
}
|
2012-06-28 03:17:49 +00:00
|
|
|
else
|
2012-05-03 18:32:18 +00:00
|
|
|
{
|
2012-06-28 03:17:49 +00:00
|
|
|
if (sbuf[0] != '\x05')
|
|
|
|
{
|
|
|
|
errstr = "SOCKS5 negotiation protocol version error";
|
|
|
|
}
|
|
|
|
else if (sbuf[2] != '\x00')
|
|
|
|
{
|
|
|
|
errstr = "SOCKS5 negotiation protocol error";
|
|
|
|
}
|
|
|
|
else if (sbuf[1] != SOCKS5_REQUEST_GRANTED)
|
|
|
|
{
|
|
|
|
errstr = translate_socks5_error(sbuf[1]);
|
|
|
|
}
|
|
|
|
else
|
2012-05-03 18:32:18 +00:00
|
|
|
{
|
|
|
|
return(sfd);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
assert(errstr != NULL);
|
|
|
|
csp->error_message = strdup(errstr);
|
2012-06-28 03:17:49 +00:00
|
|
|
log_error(LOG_LEVEL_CONNECT, "socks5_connect: %s: %N", errstr, server_size, sbuf);
|
2012-05-03 18:32:18 +00:00
|
|
|
close_socket(sfd);
|
|
|
|
errno = EINVAL;
|
|
|
|
|
|
|
|
return(JB_INVALID_SOCKET);
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
Local Variables:
|
|
|
|
tab-width: 3
|
|
|
|
end:
|
|
|
|
*/
|