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/* Proxytunnel - (C) 2001-2008 Jos Visser / Mark Janssen */
/* Contact: josv@osp.nl / maniac@maniac.nl */
/*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/tcp.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <signal.h>
#include <syslog.h>
#include <stdarg.h>
#include <stdlib.h>
#include "proxytunnel.h"
#include "io.h"
#include "config.h"
#include "cmdline.h"
#include "basicauth.h"
#include "ntlm.h"
/* Define DARWIN if compiling on MacOS-X (Darwin), to work around some
* inconsistencies. (Darwin doesn't know socklen_t) */
#ifdef DARWIN
#define socklen_t int
#endif /* DARWIN */
/* Globals */
int read_fd=0; /* The file descriptor to read from */
int write_fd=1; /* The file destriptor to write to */
/*
* Kill the program (signal handler)
*/
void signal_handler( int signal ) {
if( args_info.verbose_flag )
message( "Tunnel received signal %d. Ignoring signal.\n", signal );
// closeall();
}
/*
* Create and connect the socket that connects to the proxy. Returns
* the socket that is connected to the proxy
*/
int tunnel_connect() {
struct sockaddr_in sa;
struct hostent *he;
int sd;
/* Create the socket */
if( ( sd = socket( AF_INET, SOCK_STREAM, 0 ) ) < 0 ) {
my_perror("Can not create socket");
exit(1);
}
/* Lookup the IP address of the proxy */
if( ! ( he = gethostbyname( args_info.proxyhost_arg ) ) ) {
// FIXME: my_perror("Local proxy %s could not be resolved", args_info.proxyhost_arg);
my_perror("Local proxy could not be resolved." );
exit(1);
}
char ip[16];
snprintf(ip, 16, "%d.%d.%d.%d", he->h_addr[0] & 255, he->h_addr[1] & 255, he->h_addr[2] & 255, he->h_addr[3] & 255);
if( args_info.verbose_flag && strcmp(args_info.proxyhost_arg, ip)) {
message( "Local proxy %s resolves to %d.%d.%d.%d\n",
args_info.proxyhost_arg,
he->h_addr[0] & 255,
he->h_addr[1] & 255,
he->h_addr[2] & 255,
he->h_addr[3] & 255 );
}
/* Set up the structure to connect to the proxy port of the proxy host */
memset( &sa, '\0', sizeof( sa ) );
sa.sin_family = AF_INET;
memcpy( &sa.sin_addr.s_addr, he->h_addr, 4);
sa.sin_port = htons( args_info.proxyport_arg );
/* Connect the socket */
if( connect( sd, (struct sockaddr*) &sa, sizeof( sa ) ) < 0 ) {
my_perror("connect() failed");
exit(1);
}
/* Increase interactivity of tunnel, patch by Ingo Molnar */
int flag = 1;
setsockopt( sd, IPPROTO_TCP, TCP_NODELAY, (char *)&flag, sizeof(int));
/* Make sure we get warned when someone hangs up on us */
signal(SIGHUP,signal_handler);
if( ! args_info.quiet_flag ) {
if ( ! args_info.verbose_flag ) {
if ( args_info.remproxy_given ) {
message( "Via %s -> %s -> %s\n",
args_info.proxy_arg,
args_info.remproxy_arg,
args_info.dest_arg );
} else {
message( "Via %s -> %s\n",
args_info.proxy_arg,
args_info.dest_arg );
}
} else {
message( "Connected to %s (local proxy)\n", args_info.proxy_arg );
}
}
/* Return the socket */
return sd;
}
/* Leave a goodbye message */
void closeall() {
#ifndef CYGWIN
closelog();
#endif /* CYGWIN */
/* Close all streams */
if (stunnel) {
stream_close(stunnel);
stunnel = NULL;
}
if (std) {
stream_close(std);
std = NULL;
}
if( args_info.verbose_flag ) {
message( "Tunnel closed.\n" );
}
}
/* Run as a standalone daemon */
void do_daemon()
{
int listen_sd;
int one = 1;
struct sockaddr_in sa_serv;
struct sockaddr_in sa_cli;
socklen_t client_len;
int pid = 0;
int sd_client;
char buf[80];
unsigned char addr[4];
/* Socket descriptor */
int sd;
if ( ( listen_sd = socket( AF_INET, SOCK_STREAM, IPPROTO_TCP ) ) < 0 ) {
my_perror( "Server socket creation failed" );
exit(1);
}
#ifdef SO_REUSEPORT /* doesnt exist everywhere... */
setsockopt(listen_sd, SOL_SOCKET, SO_REUSEPORT, &one, sizeof(one));
#endif /* SO_REUSEPORT */
setsockopt(listen_sd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
memset( &sa_serv, '\0', sizeof( sa_serv ) );
sa_serv.sin_family = AF_INET;
sa_serv.sin_addr.s_addr = htonl(INADDR_ANY);
sa_serv.sin_port = htons( args_info.standalone_arg );
if ( bind( listen_sd, (struct sockaddr * )&sa_serv, sizeof( struct sockaddr ) ) < 0) {
my_perror("Server socket bind failed");
exit(1);
}
signal(SIGHUP,SIG_IGN);
signal(SIGCHLD,SIG_IGN);
#ifdef SETPROCTITLE
if( ! args_info.proctitle_given )
setproctitle( "[daemon]\0" );
else
setproctitle( "\0" );
#else
if( args_info.proctitle_given )
message( "Setting process-title is not supported in this build\n");
#endif /* SETPROCTITLE */
/* For the moment, turn of forking into background on the cygwin platform
* so users can run it in a command window and ctrl-c it to cancel.
* Also so we can put logging there, since there's no syslog on cygwin (AFAIK)
* -- Maniac
*/
#ifndef CYGWIN
/*
if ( ( pid = fork( ) ) < 0 ) {
my_perror( "Cannot fork into the background" );
exit(1);
} else if ( pid > 0 ) {
message( "Forked into the background with pid %d\n", pid );
exit(0);
}
*/
openlog( program_name, LOG_CONS|LOG_PID,LOG_DAEMON );
i_am_daemon = 1;
#endif /* CYGWIN */
atexit( closeall );
listen( listen_sd, 8 );
while (1==1) {
/* 2002/04/21
*
* Workaround a CYGWIN bug, see:
* http://www.gnu.org/software/serveez/manual/BUGS
* for bug #B0007
*
* 2004/06/23: Apparently Solaris needs this too, so
* we'll do it by default, can't hurt
*
* -- Maniac
*/
client_len = sizeof( sa_cli );
sd_client = accept( listen_sd,
(struct sockaddr *)&sa_cli, &client_len );
if ( sd_client < 0 ) {
my_perror( "accept() failed. Bailing out..." );
exit(1);
}
if ( ( pid = fork() ) < 0 ) {
my_perror( "Cannot fork worker" );
} else if ( pid == 0 ) {
read_fd = write_fd = sd_client;
/* Create a stdin/out stream */
std = stream_open(read_fd, write_fd);
/* Create a tunnel stream */
sd = tunnel_connect();
stunnel = stream_open(sd, sd);
#ifdef USE_SSL
/* If --encrypt-proxy is specified, connect to the proxy using SSL */
if ( args_info.encryptproxy_flag )
stream_enable_ssl(stunnel);
#endif /* USE_SSL */
/* Open the tunnel */
proxy_protocol(stunnel);
#ifdef USE_SSL
/* If --encrypt is specified, wrap all traffic after the proxy handoff in SSL */
if( args_info.encrypt_flag )
stream_enable_ssl(stunnel);
#endif /* USE_SSL */
#ifdef SETPROCTITLE
if( ! args_info.proctitle_given )
setproctitle( "[cpio]\0" );
else
setproctitle( "\0" );
#else
if( args_info.proctitle_given )
message( "Setting process-title is not supported in this build\n");
#endif /* SETPROCTITLE */
/* Run the tunnel - we should stay here indefinitely */
cpio(std, stunnel);
exit( 0 );
}
memcpy( &addr, &sa_cli.sin_addr.s_addr, 4 );
snprintf( (char *) buf, 16, "%u.%u.%u.%u", addr[0], addr[1], addr[2], addr[3] );
message( "Started tunnel pid=%d for connection from %s", pid, buf );
close( sd_client );
}
}
/* We begin at the beginning */
int main( int argc, char *argv[] ) {
/* Socket descriptor */
int sd;
/* Clear all stream variables (so we know whether we need to clear up) */
stunnel = NULL;
std = NULL;
program_name = argv[0];
cmdline_parser( argc, argv, &args_info );
#ifdef SETPROCTITLE
initsetproctitle( argc, argv );
#endif
/*
* This is what we do:
* - Check if we need to run as a daemon. If so, a completely
* different mainline is needed...
* - Set a signal for the hangup (HUP) signal
* - Optionally create the proxy basic authentication cookie
* - Connect to the proxy
* - Execute the proxy protocol to connect it to the origin server
* - Enter copy in-out mode to channel data hence and forth
*/
signal( SIGHUP, signal_handler );
/* If the usename is given, but password is not, prompt for it */
if( args_info.user_given && !args_info.pass_given ) {
char *cp;
cp = getpass_x ("Enter local proxy password for user %s: ", args_info.user_arg);
if (cp != NULL && strlen (cp) > 0) {
args_info.pass_arg = strdup (cp);
args_info.pass_given = 1;
memset (cp, 0, strlen(cp));
}
}
if( args_info.remuser_given && !args_info.rempass_given ) {
char *cp;
cp = getpass_x ("Enter remote proxy password for user %s: ", args_info.remuser_arg);
if (cp != NULL && strlen (cp) > 0) {
args_info.rempass_arg = strdup (cp);
args_info.rempass_given = 1;
memset (cp, 0, strlen(cp));
}
}
if( args_info.user_given && args_info.pass_given ) {
if (args_info.ntlm_flag) {
build_type1();
if ( args_info.verbose_flag )
message("Build Type 1 NTLM Message : %s\n", ntlm_type1_buf);
}
}
/* Only one of -E/-e/-R can be specified. */
if ((args_info.encrypt_flag ? 1 : 0) +
(args_info.encryptproxy_flag ? 1 : 0) +
(args_info.encryptremproxy_flag ? 1 : 0) > 1)
{
message("Error: only one of --encrypt-proxy, --encrypt-remproxy and --encrypt can be specified for a tunnel\n");
exit( 1 );
}
/* Do we need to run as a standalone daemon? */
if ( args_info.standalone_arg > 0 ) {
/* Do processing in the other mainline... */
do_daemon();
} else {
/* Inetd trick */
if( args_info.inetd_flag ) {
write_fd=0;
}
/* Create a stdin/out stream */
std = stream_open(read_fd, write_fd);
/* Create a tunnel stream */
sd = tunnel_connect();
stunnel = stream_open(sd, sd);
/* If --encrypt-proxy is specified, connect to the proxy using SSL */
#ifdef USE_SSL
if ( args_info.encryptproxy_flag )
stream_enable_ssl(stunnel);
#endif /* USE_SSL */
/* Open the tunnel */
proxy_protocol(stunnel);
/* If --encrypt is specified, wrap all traffic after the proxy handoff in SSL */
#ifdef USE_SSL
if( args_info.encrypt_flag )
stream_enable_ssl(stunnel);
#endif /* USE_SSL */
#ifdef SETPROCTITLE
if( ! args_info.proctitle_given )
setproctitle( "[cpio]\0" );
else
setproctitle( "\0" );
#else
if( args_info.proctitle_given )
message( "Setting process-title is not supported in this build\n");
#endif /* SETPROCTITLE */
/* Run the tunnel - we should stay here indefinitely */
cpio(std, stunnel);
}
exit( 0 );
}
// vim:noexpandtab:ts=4
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