+++ /dev/null
-const char gateway_rcs[] = "$Id: gateway.c,v 2.0 2002/06/04 14:34:21 jongfoster Exp $";
-/*********************************************************************
- *
- * File : $Source: /cvsroot/ijbswa/current/src/gateway.c,v $
- *
- * Purpose : Contains functions to connect to a server, possibly
- * using a "forwarder" (i.e. HTTP proxy and/or a SOCKS4
- * proxy).
- *
- * Copyright : Written by and Copyright (C) 2001 the SourceForge
- * 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.
- *
- * Revisions :
- * $Log: gateway.c,v $
- * Revision 2.0 2002/06/04 14:34:21 jongfoster
- * Moving source files to src/
- *
- * Revision 1.16 2002/05/12 21:36:29 jongfoster
- * Correcting function comments
- *
- * Revision 1.15 2002/03/26 22:29:54 swa
- * we have a new homepage!
- *
- * Revision 1.14 2002/03/24 13:25:43 swa
- * name change related issues
- *
- * Revision 1.13 2002/03/13 00:29:59 jongfoster
- * Killing warnings
- *
- * Revision 1.12 2002/03/09 20:03:52 jongfoster
- * - Making various functions return int rather than size_t.
- * (Undoing a recent change). Since size_t is unsigned on
- * Windows, functions like read_socket that return -1 on
- * error cannot return a size_t.
- *
- * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
- * crashes, and also frequently caused JB to jump to 100%
- * CPU and stay there. (Because it thought it had just
- * read ((unsigned)-1) == 4Gb of data...)
- *
- * - The signature of write_socket has changed, it now simply
- * returns success=0/failure=nonzero.
- *
- * - Trying to get rid of a few warnings --with-debug on
- * Windows, I've introduced a new type "jb_socket". This is
- * used for the socket file descriptors. On Windows, this
- * is SOCKET (a typedef for unsigned). Everywhere else, it's
- * an int. The error value can't be -1 any more, so it's
- * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
- * Windows it maps to the #define INVALID_SOCKET.)
- *
- * - The signature of bind_port has changed.
- *
- * Revision 1.11 2002/03/08 17:46:04 jongfoster
- * Fixing int/size_t warnings
- *
- * Revision 1.10 2002/03/07 03:50:19 oes
- * - Improved handling of failed DNS lookups
- * - Fixed compiler warnings
- *
- * Revision 1.9 2001/10/25 03:40:48 david__schmidt
- * Change in porting tactics: OS/2's EMX porting layer doesn't allow multiple
- * threads to call select() simultaneously. So, it's time to do a real, live,
- * native OS/2 port. See defines for __EMX__ (the porting layer) vs. __OS2__
- * (native). Both versions will work, but using __OS2__ offers multi-threading.
- *
- * Revision 1.8 2001/09/13 20:10:12 jongfoster
- * Fixing missing #include under Windows
- *
- * Revision 1.7 2001/09/12 17:58:26 steudten
- *
- * add #include <string.h>
- *
- * Revision 1.6 2001/09/10 10:41:16 oes
- * Added #include in.h
- *
- * Revision 1.5 2001/07/29 18:47:57 jongfoster
- * Adding missing #include project.h
- *
- * Revision 1.4 2001/07/24 12:47:06 oes
- * Applied BeOS support update by Eugenia
- *
- * Revision 1.3 2001/06/09 10:55:28 jongfoster
- * Changing BUFSIZ ==> BUFFER_SIZE
- *
- * Revision 1.2 2001/06/07 23:11:38 jongfoster
- * Removing gateways[] list - no longer used.
- * Replacing function pointer in struct gateway with a directly
- * called function forwarded_connect(), which can do the common
- * task of deciding whether to connect to the web server or HTTP
- * proxy.
- * Replacing struct gateway with struct forward_spec
- * Fixing bug with SOCKS4A and HTTP proxy server in combination.
- * It was a bug which led to the connection being made to the web
- * server rather than the HTTP proxy, and also a buffer overrun.
- *
- * Revision 1.1.1.1 2001/05/15 13:58:54 oes
- * Initial import of version 2.9.3 source tree
- *
- *
- *********************************************************************/
-\f
-
-#include "config.h"
-
-#include <stdio.h>
-#include <sys/types.h>
-
-#ifndef _WIN32
-#include <netinet/in.h>
-#endif
-
-#include <errno.h>
-#include <string.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"
-
-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);
-
-
-/** SOCKS command code. */
-#define SOCKS_REQUEST_GRANTED 90
-
-/** SOCKS command code. */
-#define SOCKS_REQUEST_REJECT 91
-
-/** SOCKS command code. */
-#define SOCKS_REQUEST_IDENT_FAILED 92
-
-/** SOCKS command code. */
-#define SOCKS_REQUEST_IDENT_CONFLICT 93
-
-
-/** 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 */
- unsigned char userid; /**< First byte of userid */
- /* 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 */
-};
-
-/** The SOCKS user ID to use */
-static const char socks_userid[] = "anonymous";
-
-
-/*********************************************************************
- *
- * 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;
-
- /* 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:
- return (connect_to(dest_host, dest_port, csp));
-
- case SOCKS_4:
- case SOCKS_4A:
- return (socks4_connect(fwd, dest_host, dest_port, csp));
-
- default:
- /* Should never get here */
- log_error(LOG_LEVEL_FATAL, "SOCKS4 impossible internal error - bad SOCKS type.");
- errno = EINVAL;
- return(JB_INVALID_SOCKET);
- }
-}
-
-
-/*********************************************************************
- *
- * 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.
- *
- * 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)
-{
- int web_server_addr;
- char cbuf[BUFFER_SIZE];
- char sbuf[BUFFER_SIZE];
- struct socks_op *c = (struct socks_op *)cbuf;
- struct socks_reply *s = (struct socks_reply *)sbuf;
- size_t n;
- size_t csiz;
- jb_socket sfd;
- int err = 0;
- char *errstr;
-
- if ((fwd->gateway_host == NULL) || (*fwd->gateway_host == '\0'))
- {
- log_error(LOG_LEVEL_CONNECT, "socks4_connect: NULL gateway host specified");
- err = 1;
- }
-
- if (fwd->gateway_port <= 0)
- {
- log_error(LOG_LEVEL_CONNECT, "socks4_connect: invalid gateway port specified");
- err = 1;
- }
-
- if (err)
- {
- errno = EINVAL;
- return(JB_INVALID_SOCKET);
- }
-
- /* build a socks request for connection to the web server */
-
- strcpy((char *)&(c->userid), socks_userid);
-
- csiz = sizeof(*c) + sizeof(socks_userid) - 1;
-
- switch (fwd->type)
- {
- case SOCKS_4:
- web_server_addr = htonl(resolve_hostname_to_ip(target_host));
- if (web_server_addr == INADDR_NONE)
- {
- log_error(LOG_LEVEL_CONNECT, "socks4_connect: could not resolve target host %s", target_host);
- return(JB_INVALID_SOCKET);
- }
- break;
- case SOCKS_4A:
- web_server_addr = 0x00000001;
- n = csiz + strlen(target_host) + 1;
- if (n > sizeof(cbuf))
- {
- errno = EINVAL;
- return(JB_INVALID_SOCKET);
- }
- strcpy(cbuf + csiz, target_host);
- csiz = n;
- break;
- default:
- /* Should never get here */
- log_error(LOG_LEVEL_FATAL, "SOCKS4 impossible internal error - bad SOCKS type.");
- errno = EINVAL;
- return(JB_INVALID_SOCKET);
- }
-
- c->vn = 4;
- c->cd = 1;
- c->dstport[0] = (target_port >> 8 ) & 0xff;
- c->dstport[1] = (target_port ) & 0xff;
- c->dstip[0] = (web_server_addr >> 24 ) & 0xff;
- c->dstip[1] = (web_server_addr >> 16 ) & 0xff;
- c->dstip[2] = (web_server_addr >> 8 ) & 0xff;
- c->dstip[3] = (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)
- {
- return(JB_INVALID_SOCKET);
- }
-
- if (write_socket(sfd, (char *)c, csiz))
- {
- log_error(LOG_LEVEL_CONNECT, "SOCKS4 negotiation write failed...");
- close_socket(sfd);
- return(JB_INVALID_SOCKET);
- }
-
- if (read_socket(sfd, sbuf, sizeof(sbuf)) != sizeof(*s))
- {
- log_error(LOG_LEVEL_CONNECT, "SOCKS4 negotiation read failed...");
- close_socket(sfd);
- return(JB_INVALID_SOCKET);
- }
-
- switch (s->cd)
- {
- case SOCKS_REQUEST_GRANTED:
- return(sfd);
- break;
- case SOCKS_REQUEST_REJECT:
- errstr = "SOCKS request rejected or failed";
- errno = EINVAL;
- break;
- case SOCKS_REQUEST_IDENT_FAILED:
- errstr = "SOCKS request rejected because "
- "SOCKS server cannot connect to identd on the client";
- errno = EACCES;
- break;
- case SOCKS_REQUEST_IDENT_CONFLICT:
- errstr = "SOCKS request rejected because "
- "the client program and identd report "
- "different user-ids";
- errno = EACCES;
- break;
- default:
- errstr = cbuf;
- errno = ENOENT;
- sprintf(errstr,
- "SOCKS request rejected for reason code %d\n", s->cd);
- }
-
- log_error(LOG_LEVEL_CONNECT, "socks4_connect: %s ...", errstr);
-
- close_socket(sfd);
- return(JB_INVALID_SOCKET);
-
-}
-
-
-/*
- Local Variables:
- tab-width: 3
- end:
-*/
projects / privoxy.git / blobdiff