-const char gateway_rcs[] = "$Id: gateway.c,v 1.92 2012/10/23 10:16:52 fabiankeil Exp $";
+const char gateway_rcs[] = "$Id: gateway.c,v 1.99 2016/10/25 10:46:56 fabiankeil Exp $";
/*********************************************************************
*
* File : $Source: /cvsroot/ijbswa/current/gateway.c,v $
* using a "forwarder" (i.e. HTTP proxy and/or a SOCKS4
* or SOCKS5 proxy).
*
- * Copyright : Written by and Copyright (C) 2001-2009 the
+ * Copyright : Written by and Copyright (C) 2001-2016 the
* Privoxy team. http://www.privoxy.org/
*
* Based on the Internet Junkbuster originally written
#include "gateway.h"
#include "miscutil.h"
#include "list.h"
+#include "parsers.h"
#ifdef FEATURE_CONNECTION_KEEP_ALIVE
#ifdef HAVE_POLL
switch (fwd->type)
{
case SOCKS_NONE:
+ case FORWARD_WEBSERVER:
sfd = connect_to(dest_host, dest_port, csp);
break;
case SOCKS_4:
}
+#ifdef FUZZ_SOCKS
+/*********************************************************************
+ *
+ * Function : socks_fuzz
+ *
+ * Description : Wrapper around socks[45]_connect() used for fuzzing.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : JB_ERR_OK or JB_ERR_PARSE
+ *
+ *********************************************************************/
+extern jb_err socks_fuzz(struct client_state *csp)
+{
+ jb_socket socket;
+ static struct forward_spec fwd;
+ char target_host[] = "fuzz.example.org";
+ int target_port = 12345;
+
+ fwd.gateway_host = strdup_or_die("fuzz.example.org");
+ fwd.gateway_port = 12345;
+
+ fwd.type = SOCKS_4A;
+ socket = socks4_connect(&fwd, target_host, target_port, csp);
+
+ if (JB_INVALID_SOCKET != socket)
+ {
+ fwd.type = SOCKS_5;
+ socket = socks5_connect(&fwd, target_host, target_port, csp);
+ }
+
+ if (JB_INVALID_SOCKET == socket)
+ {
+ log_error(LOG_LEVEL_ERROR, "%s", csp->error_message);
+ return JB_ERR_PARSE;
+ }
+
+ log_error(LOG_LEVEL_INFO, "Input looks like an acceptable socks response");
+
+ return JB_ERR_OK;
+
+}
+#endif
+
/*********************************************************************
*
* Function : socks4_connect
c->dstip[2] = (unsigned char)((web_server_addr >> 8) & 0xff);
c->dstip[3] = (unsigned char)((web_server_addr ) & 0xff);
+#ifdef FUZZ_SOCKS
+ sfd = 0;
+#else
/* pass the request to the socks server */
sfd = connect_to(fwd->gateway_host, fwd->gateway_port, csp);
err = 1;
close_socket(sfd);
}
- else if (read_socket(sfd, buf, sizeof(buf)) != sizeof(*s))
+ else
+#endif
+ if (read_socket(sfd, buf, sizeof(buf)) != sizeof(*s))
{
errstr = "SOCKS4 negotiation read failed.";
log_error(LOG_LEVEL_CONNECT, "socks4_connect: %s", errstr);
case SOCKS5_REQUEST_NETWORK_UNREACHABLE:
return "SOCKS5 network unreachable";
case SOCKS5_REQUEST_HOST_UNREACHABLE:
- return "SOCKS5 host unreachable";
+ return "SOCKS5 destination host unreachable";
case SOCKS5_REQUEST_CONNECTION_REFUSED:
return "SOCKS5 connection refused";
case SOCKS5_REQUEST_TTL_EXPIRED:
}
}
+
/*********************************************************************
*
* Function : socks5_connect
int target_port,
struct client_state *csp)
{
+#define SIZE_SOCKS5_REPLY_IPV4 10
+#define SIZE_SOCKS5_REPLY_IPV6 22
+#define SOCKS5_REPLY_DIFFERENCE (SIZE_SOCKS5_REPLY_IPV6 - SIZE_SOCKS5_REPLY_IPV4)
int err = 0;
char cbuf[300];
- char sbuf[10];
+ char sbuf[SIZE_SOCKS5_REPLY_IPV6];
size_t client_pos = 0;
int server_size = 0;
size_t hostlen = 0;
return(JB_INVALID_SOCKET);
}
+#ifdef FUZZ_SOCKS
+ sfd = 0;
+ if (!err && read_socket(sfd, sbuf, 2) != 2)
+#else
/* pass the request to the socks server */
sfd = connect_to(fwd->gateway_host, fwd->gateway_port, csp);
close_socket(sfd);
return(JB_INVALID_SOCKET);
}
-
if (!data_is_available(sfd, csp->config->socket_timeout))
{
if (socket_is_still_alive(sfd))
}
if (!err && read_socket(sfd, sbuf, sizeof(sbuf)) != 2)
+#endif
{
errstr = "SOCKS5 negotiation read failed";
err = 1;
cbuf[client_pos++] = (char)((target_port >> 8) & 0xff);
cbuf[client_pos++] = (char)((target_port ) & 0xff);
+#ifndef FUZZ_SOCKS
if (write_socket(sfd, cbuf, client_pos))
{
errstr = "SOCKS5 negotiation write failed";
}
/*
- * Optimistically send the request headers with the initial
- * request if the user requested use of Tor extensions, the
- * CONNECT method isn't being used (in which case the client
+ * Optimistically send the HTTP request with the initial
+ * SOCKS request if the user enabled the use of Tor extensions,
+ * the CONNECT method isn't being used (in which case the client
* doesn't send data until it gets our 200 response) and the
- * client request has been already read completely.
- *
- * Not optimistically sending the request body (if there is one)
- * makes it easier to implement, but isn't an actual requirement.
+ * client request has actually been completely read already.
*/
if ((fwd->type == SOCKS_5T) && (csp->http->ssl == 0)
&& (csp->flags & CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ))
return(JB_INVALID_SOCKET);
}
freez(client_headers);
+ if (csp->expected_client_content_length != 0)
+ {
+ unsigned long long buffered_request_bytes =
+ (unsigned long long)(csp->client_iob->eod - csp->client_iob->cur);
+ log_error(LOG_LEVEL_CONNECT,
+ "Optimistically sending %d bytes of client body. Expected %d",
+ csp->expected_client_content_length, buffered_request_bytes);
+ assert(csp->expected_client_content_length == buffered_request_bytes);
+ if (write_socket(sfd, csp->client_iob->cur, buffered_request_bytes))
+ {
+ log_error(LOG_LEVEL_CONNECT,
+ "optimistically writing %d bytes of client body to: %s failed: %E",
+ buffered_request_bytes, csp->http->hostport);
+ return(JB_INVALID_SOCKET);
+ }
+ clear_iob(csp->client_iob);
+ }
}
+#endif
- server_size = read_socket(sfd, sbuf, sizeof(sbuf));
- if (server_size != sizeof(sbuf))
+ server_size = read_socket(sfd, sbuf, SIZE_SOCKS5_REPLY_IPV4);
+ if (server_size != SIZE_SOCKS5_REPLY_IPV4)
{
errstr = "SOCKS5 negotiation read failed";
}
}
else
{
- return(sfd);
+ if (sbuf[3] == '\x04')
+ {
+ /*
+ * The address field contains an IPv6 address
+ * which means we didn't get the whole reply
+ * yet. Read and discard the rest of it to make
+ * sure it isn't treated as HTTP data later on.
+ */
+ server_size = read_socket(sfd, sbuf, SOCKS5_REPLY_DIFFERENCE);
+ if (server_size != SOCKS5_REPLY_DIFFERENCE)
+ {
+ errstr = "SOCKS5 negotiation read failed (IPv6 address)";
+ }
+ }
+ else if (sbuf[3] != '\x01')
+ {
+ errstr = "SOCKS5 reply contains unsupported address type";
+ }
+ if (errstr == NULL)
+ {
+ return(sfd);
+ }
}
}
projects / privoxy.git / blobdiff