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@@ -0,0 +1,2982 @@
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+/***********************************************************************
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+ * connect.c -- Make socket connection using SOCKS4/5 and HTTP tunnel.
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+ *
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+ * Copyright (c) 2000-2006 Shun-ichi Goto
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+ * Copyright (c) 2002, J. Grant (English Corrections)
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License
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+ * as published by the Free Software Foundation; either version 2
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+ * of the License, or (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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+ *
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+ * ---------------------------------------------------------
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+ * PROJECT: My Test Program
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+ * AUTHOR: Shun-ichi GOTO <gotoh@taiyo.co.jp>
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+ * CREATE: Wed Jun 21, 2000
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+ * REVISION: $Revision: 100 $
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+ * ---------------------------------------------------------
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+ *
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+ * Getting Source
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+ * ==============
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+ *
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+ * Recent version of 'connect.c' is available from
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+ * http://www.taiyo.co.jp/~gotoh/ssh/connect.c
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+ *
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+ * Related tool, ssh-askpass.exe (alternative ssh-askpass on UNIX)
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+ * is available:
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+ * http://www.taiyo.co.jp/~gotoh/ssh/ssh-askpass.exe.gz
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+ *
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+ * See more detail:
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+ * http://www.taiyo.co.jp/~gotoh/ssh/connect.html
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+ *
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+ * How To Compile
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+ * ==============
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+ *
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+ * On UNIX environment:
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+ * $ gcc connect.c -o connect
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+ *
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+ * On SOLARIS:
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+ * $ gcc -o connect -lresolv -lsocket -lnsl connect.c
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+ *
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+ * on Win32 environment:
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+ * $ cl connect.c wsock32.lib advapi32.lib
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+ * or
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+ * $ bcc32 connect.c wsock32.lib advapi32.lib
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+ * or
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+ * $ gcc connect.c -o connect
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+ *
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+ * on Mac OS X environment:
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+ * $ gcc connect.c -o connect -lresolv
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+ * or
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+ * $ gcc connect.c -o connect -DBIND_8_COMPAT=1
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+ *
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+ * How To Use
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+ * ==========
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+ *
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+ * You can specify proxy method in an environment variable or in a
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+ * command line option.
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+ *
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+ * usage: connect [-dnhst45] [-R resolve] [-p local-port] [-w sec]
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+ * [-H [user@]proxy-server[:port]]
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+ * [-S [user@]socks-server[:port]]
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+ * [-T proxy-server[:port]]
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+ * [-c telnet proxy command]
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+ * host port
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+ *
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+ * "host" and "port" is for the target hostname and port-number to
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+ * connect to.
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+ *
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+ * The -H option specifys a hostname and port number of the http proxy
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+ * server to relay. If port is omitted, 80 is used. You can specify this
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+ * value in the environment variable HTTP_PROXY and pass the -h option
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+ * to use it.
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+ *
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+ * The -S option specifys the hostname and port number of the SOCKS
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+ * server to relay. Like -H, port number can be omitted and the default
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+ * is 1080. You can also specify this value pair in the environment
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+ * variable SOCKS5_SERVER and give the -s option to use it.
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+ *
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+ * The '-4' and the '-5' options are for specifying SOCKS relaying and
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+ * indicates protocol version to use. It is valid only when used with
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+ * '-s' or '-S'. Default is '-5' (protocol version 5)
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+ *
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+ * The '-R' option is for specifying method to resolve the
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+ * hostname. Three keywords ("local", "remote", "both") or dot-notation
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+ * IP address are acceptable. The keyword "both" means, "Try local
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+ * first, then remote". If a dot-notation IP address is specified, use
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+ * this host as nameserver. The default is "remote" for SOCKS5 or
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+ * "local" for others. On SOCKS4 protocol, remote resolving method
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+ * ("remote" and "both") requires protocol 4a supported server.
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+ *
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+ * The '-p' option will forward a local TCP port instead of using the
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+ * standard input and output.
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+ *
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+ * The '-P' option is same to '-p' except keep remote session. The
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+ * program repeats waiting the port with holding remote session without
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+ * disconnecting. To disconnect the remote session, send EOF to stdin or
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+ * kill the program.
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+ *
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+ * The '-w' option specifys timeout seconds for making connection with
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+ * TARGET host.
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+ *
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+ * The '-d' option is used for debug. If you fail to connect, use this
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+ * and check request to and response from server.
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+ *
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+ * You can omit the "port" argument when program name is special format
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+ * containing port number itself. For example,
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+ * $ ln -s connect connect-25
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+ * means this connect-25 command is spcifying port number 25 already
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+ * so you need not 2nd argument (and ignored if specified).
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+ *
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+ * To use proxy, this example is for SOCKS5 connection to connect to
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+ * 'host' at port 25 via SOCKS5 server on 'firewall' host.
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+ * $ connect -S firewall host 25
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+ * or
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+ * $ SOCKS5_SERVER=firewall; export SOCKS5_SERVER
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+ * $ connect -s host 25
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+ *
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+ * For a HTTP-PROXY connection:
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+ * $ connect -H proxy-server:8080 host 25
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+ * or
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+ * $ HTTP_PROXY=proxy-server:8080; export HTTP_PROXY
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+ * $ connect -h host 25
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+ * To forward a local port, for example to use ssh:
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+ * $ connect -p 5550 -H proxy-server:8080 host 22
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+ * ($ ssh -l user -p 5550 localhost )
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+ *
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+ * TIPS
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+ * ====
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+ *
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+ * Connect.c doesn't have any configuration to specify the SOCKS server.
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+ * If you are a mobile user, this limitation might bother you. However,
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+ * You can compile connect.c and link with other standard SOCKS library
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+ * like the NEC SOCKS5 library or Dante. This means connect.c is
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+ * socksified and uses a configration file like to other SOCKSified
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+ * network commands and you can switch configuration file any time
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+ * (ex. when ppp startup) that brings you switching of SOCKS server for
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+ * connect.c in same way with other commands. For this case, you can
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+ * write ~/.ssh/config like this:
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+ *
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+ * ProxyCommand connect -n %h %p
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+ *
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+ * SOCKS5 authentication
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+ * =====================
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+ *
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+ * Only USER/PASS authentication is supported.
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+ *
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+ * Proxy authentication
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+ * ====================
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+ *
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+ * Only BASIC scheme is supported.
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+ *
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+ * Authentication informations
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+ * ===========================
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+ *
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+ * User name for authentication is specifed by an environment variable
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+ * or system login name. And password is specified from environment
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+ * variable or external program (specified in $SSH_ASKPASS) or tty.
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+ *
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+ * Following environment variable is used for specifying user name.
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+ * SOCKS: $SOCKS5_USER, $LOGNAME, $USER
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+ * HTTP Proxy: $HTTP_PROXY_USER, $LOGNAME, $USER
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+ *
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+ * ssh-askpass support
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+ * ===================
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+ *
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+ * You can use ssh-askpass (came from OpenSSH or else) to specify
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+ * password on graphical environment (X-Window or MS Windows). To use
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+ * this, set program name to environment variable SSH_ASKPASS. On UNIX,
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+ * X-Window must be required, so $DISPLAY environment variable is also
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+ * needed. On Win32 environment, $DISPLAY is not mentioned.
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+ *
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+ * Related Informations
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+ * ====================
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+ *
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+ * SOCKS5 -- RFC 1928, RFC 1929, RFC 1961
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+ * NEC SOCKS Reference Implementation is available from:
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+ * http://www.socks.nec.com
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+ * DeleGate version 5 or earlier can be SOCKS4 server,
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+ * and version 6 can be SOCKS5 and SOCKS4 server.
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+ * and version 7.7.0 or later can be SOCKS5 and SOCKS4a server.
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+ * http://www.delegate.org/delegate/
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+ *
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+ * HTTP-Proxy --
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+ * Many http proxy servers supports this, but https should
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+ * be allowed as configuration on your host.
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+ * For example on DeleGate, you should add "https" to the
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+ * "REMITTABLE" parameter to allow HTTP-Proxy like this:
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+ * delegated -Pxxxx ...... REMITTABLE="+,https" ...
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+ *
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+ * Hypertext Transfer Protocol -- HTTP/1.1 -- RFC 2616
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+ * HTTP Authentication: Basic and Digest Access Authentication -- RFC 2617
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+ * For proxy authentication, refer these documents.
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+ *
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+ ***********************************************************************/
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+
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+#include <stdio.h>
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+#include <stdlib.h>
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+#include <string.h>
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+#include <ctype.h>
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+#include <memory.h>
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+#include <errno.h>
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+#include <assert.h>
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+#include <sys/types.h>
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+#include <stdarg.h>
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+#include <fcntl.h>
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+#include <signal.h>
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+
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+#ifdef __CYGWIN32__
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+#undef _WIN32
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+#endif
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+
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+#ifdef _WIN32
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+#include <windows.h>
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+#include <winsock.h>
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+#include <sys/stat.h>
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+#include <io.h>
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+#include <conio.h>
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+#else /* !_WIN32 */
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+#include <unistd.h>
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+#include <pwd.h>
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+#include <termios.h>
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+#include <sys/time.h>
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+#ifndef __hpux
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+#include <sys/select.h>
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+#endif /* __hpux */
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+#include <sys/socket.h>
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+#include <netinet/in.h>
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+#include <arpa/inet.h>
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+#include <netdb.h>
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+#if !defined(_WIN32) && !defined(__CYGWIN32__)
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+#define WITH_RESOLVER 1
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+#include <arpa/nameser.h>
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+#include <resolv.h>
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+#else /* not ( not _WIN32 && not __CYGWIN32__) */
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+#undef WITH_RESOLVER
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+#endif /* not ( not _WIN32 && not __CYGWIN32__) */
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+#endif /* !_WIN32 */
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+
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+#ifdef _WIN32
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+#define ECONNRESET WSAECONNRESET
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+#endif /* _WI32 */
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+
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+
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+
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+#ifndef LINT
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+static char *vcid = "$Id: connect.c 100 2007-07-03 10:48:26Z gotoh $";
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+#endif
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+
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+/* Microsoft Visual C/C++ has _snprintf() and _vsnprintf() */
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+#ifdef _MSC_VER
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+#define snprintf _snprintf
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+#define vsnprintf _vsnprintf
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+#endif
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+
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+/* consider Borland C */
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+#ifdef __BORLANDC__
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+#define _kbhit kbhit
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+#define _setmode setmode
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+#endif
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+
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+/* help message.
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+ Win32 environment does not support -R option (vc and cygwin)
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+ Win32 native compilers does not support -w option, yet (vc)
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+*/
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+static char *usage = "usage: %s [-dnhst45] [-p local-port]"
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+#ifdef _WIN32
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+#ifdef __CYGWIN32__
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+"[-w timeout] \n" /* cygwin cannot -R */
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+#else /* not __CYGWIN32__ */
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+" \n" /* VC cannot -w nor -R */
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+#endif /* not __CYGWIN32__ */
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+#else /* not _WIN32 */
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+/* help message for UNIX */
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+"[-R resolve] [-w timeout] \n"
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+#endif /* not _WIN32 */
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+" [-H proxy-server[:port]] [-S [user@]socks-server[:port]] \n"
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+" [-T proxy-server[:port]]\n"
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+" [-c telnet-proxy-command]\n"
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+" host port\n";
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+
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+/* name of this program */
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+char *progname = NULL;
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+char *progdesc = "connect --- simple relaying command via proxy.";
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+char *rcs_revstr = "$Revision: 100 $";
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+char *revstr = NULL;
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+int major_version = 1;
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+int minor_version = 0;
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+
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+/* set of character for strspn() */
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+const char *digits = "0123456789";
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+const char *dotdigits = "0123456789.";
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+
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+/* options */
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+int f_debug = 0;
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+
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+/* report flag to hide secure information */
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+int f_report = 1;
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+
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+int connect_timeout = 0;
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+
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+/* local input type */
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+#define LOCAL_STDIO 0
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+#define LOCAL_SOCKET 1
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+char *local_type_names[] = { "stdio", "socket" };
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+int local_type = LOCAL_STDIO;
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+u_short local_port = 0; /* option 'p' */
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+int f_hold_session = 0; /* option 'P' */
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+
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+char *telnet_command = "telnet %h %p";
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+
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+/* utiity types, pair holder of number and string */
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+typedef struct {
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+ int num;
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+ const char *str;
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+} LOOKUP_ITEM;
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+
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+/* relay method, server and port */
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+#define METHOD_UNDECIDED 0
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+#define METHOD_DIRECT 1
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+#define METHOD_SOCKS 2
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+#define METHOD_HTTP 3
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+#define METHOD_TELNET 4
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+char *method_names[] = { "UNDECIDED", "DIRECT", "SOCKS", "HTTP", "TELNET" };
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+
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+int relay_method = METHOD_UNDECIDED; /* relaying method */
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+char *relay_host = NULL; /* hostname of relay server */
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+u_short relay_port = 0; /* port of relay server */
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+char *relay_user = NULL; /* user name for auth */
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+
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+/* destination target host and port */
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+char *dest_host = NULL;
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+struct sockaddr_in dest_addr;
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+u_short dest_port = 0;
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+
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+/* informations for SOCKS */
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+#define SOCKS5_REP_SUCCEEDED 0x00 /* succeeded */
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+#define SOCKS5_REP_FAIL 0x01 /* general SOCKS serer failure */
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+#define SOCKS5_REP_NALLOWED 0x02 /* connection not allowed by ruleset */
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+#define SOCKS5_REP_NUNREACH 0x03 /* Network unreachable */
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+#define SOCKS5_REP_HUNREACH 0x04 /* Host unreachable */
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+#define SOCKS5_REP_REFUSED 0x05 /* connection refused */
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+#define SOCKS5_REP_EXPIRED 0x06 /* TTL expired */
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+#define SOCKS5_REP_CNOTSUP 0x07 /* Command not supported */
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+#define SOCKS5_REP_ANOTSUP 0x08 /* Address not supported */
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+#define SOCKS5_REP_INVADDR 0x09 /* Inalid address */
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+
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+LOOKUP_ITEM socks5_rep_names[] = {
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+ { SOCKS5_REP_SUCCEEDED, "succeeded"},
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+ { SOCKS5_REP_FAIL, "general SOCKS server failure"},
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+ { SOCKS5_REP_NALLOWED, "connection not allowed by ruleset"},
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+ { SOCKS5_REP_NUNREACH, "Network unreachable"},
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+ { SOCKS5_REP_HUNREACH, "Host unreachable"},
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+ { SOCKS5_REP_REFUSED, "connection refused"},
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+ { SOCKS5_REP_EXPIRED, "TTL expired"},
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+ { SOCKS5_REP_CNOTSUP, "Command not supported"},
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+ { SOCKS5_REP_ANOTSUP, "Address not supported"},
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+ { SOCKS5_REP_INVADDR, "Invalid address"},
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+ { -1, NULL }
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+};
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+
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+/* SOCKS5 authentication methods */
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+#define SOCKS5_AUTH_REJECT 0xFF /* No acceptable auth method */
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+#define SOCKS5_AUTH_NOAUTH 0x00 /* without authentication */
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+#define SOCKS5_AUTH_GSSAPI 0x01 /* GSSAPI */
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+#define SOCKS5_AUTH_USERPASS 0x02 /* User/Password */
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+#define SOCKS5_AUTH_CHAP 0x03 /* Challenge-Handshake Auth Proto. */
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+#define SOCKS5_AUTH_EAP 0x05 /* Extensible Authentication Proto. */
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+#define SOCKS5_AUTH_MAF 0x08 /* Multi-Authentication Framework */
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+
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|
|
+#define SOCKS4_REP_SUCCEEDED 90 /* rquest granted (succeeded) */
|
|
|
+#define SOCKS4_REP_REJECTED 91 /* request rejected or failed */
|
|
|
+#define SOCKS4_REP_IDENT_FAIL 92 /* cannot connect identd */
|
|
|
+#define SOCKS4_REP_USERID 93 /* user id not matched */
|
|
|
+
|
|
|
+LOOKUP_ITEM socks4_rep_names[] = {
|
|
|
+ { SOCKS4_REP_SUCCEEDED, "request granted (succeeded)"},
|
|
|
+ { SOCKS4_REP_REJECTED, "request rejected or failed"},
|
|
|
+ { SOCKS4_REP_IDENT_FAIL, "cannot connect identd"},
|
|
|
+ { SOCKS4_REP_USERID, "user id not matched"},
|
|
|
+ { -1, NULL }
|
|
|
+};
|
|
|
+
|
|
|
+#define RESOLVE_UNKNOWN 0
|
|
|
+#define RESOLVE_LOCAL 1
|
|
|
+#define RESOLVE_REMOTE 2
|
|
|
+#define RESOLVE_BOTH 3
|
|
|
+char *resolve_names[] = { "UNKNOWN", "LOCAL", "REMOTE", "BOTH" };
|
|
|
+
|
|
|
+int socks_version = 5; /* SOCKS protocol version */
|
|
|
+int socks_resolve = RESOLVE_UNKNOWN;
|
|
|
+struct sockaddr_in socks_ns;
|
|
|
+char *socks5_auth = NULL;
|
|
|
+
|
|
|
+/* Environment variable names */
|
|
|
+#define ENV_SOCKS_SERVER "SOCKS_SERVER" /* SOCKS server */
|
|
|
+#define ENV_SOCKS5_SERVER "SOCKS5_SERVER"
|
|
|
+#define ENV_SOCKS4_SERVER "SOCKS4_SERVER"
|
|
|
+
|
|
|
+#define ENV_SOCKS_RESOLVE "SOCKS_RESOLVE" /* resolve method */
|
|
|
+#define ENV_SOCKS5_RESOLVE "SOCKS5_RESOLVE"
|
|
|
+#define ENV_SOCKS4_RESOLVE "SOCKS4_RESOLVE"
|
|
|
+
|
|
|
+#define ENV_SOCKS5_USER "SOCKS5_USER" /* auth user for SOCKS5 */
|
|
|
+#define ENV_SOCKS4_USER "SOCKS4_USER" /* auth user for SOCKS4 */
|
|
|
+#define ENV_SOCKS_USER "SOCKS_USER" /* auth user for SOCKS */
|
|
|
+#define ENV_SOCKS5_PASSWD "SOCKS5_PASSWD" /* auth password for SOCKS5 */
|
|
|
+#define ENV_SOCKS5_PASSWORD "SOCKS5_PASSWORD" /* old style */
|
|
|
+
|
|
|
+#define ENV_HTTP_PROXY "HTTP_PROXY" /* common env var */
|
|
|
+#define ENV_HTTP_PROXY_USER "HTTP_PROXY_USER" /* auth user */
|
|
|
+#define ENV_HTTP_PROXY_PASSWORD "HTTP_PROXY_PASSWORD" /* auth password */
|
|
|
+
|
|
|
+#define ENV_TELNET_PROXY "TELNET_PROXY" /* common env var */
|
|
|
+
|
|
|
+#define ENV_CONNECT_USER "CONNECT_USER" /* default auth user name */
|
|
|
+#define ENV_CONNECT_PASSWORD "CONNECT_PASSWORD" /* default auth password */
|
|
|
+
|
|
|
+#define ENV_SOCKS_DIRECT "SOCKS_DIRECT" /* addr-list for non-proxy */
|
|
|
+#define ENV_SOCKS5_DIRECT "SOCKS5_DIRECT"
|
|
|
+#define ENV_SOCKS4_DIRECT "SOCKS4_DIRECT"
|
|
|
+#define ENV_HTTP_DIRECT "HTTP_DIRECT"
|
|
|
+#define ENV_CONNECT_DIRECT "CONNECT_DIRECT"
|
|
|
+
|
|
|
+#define ENV_SOCKS5_AUTH "SOCKS5_AUTH"
|
|
|
+#define ENV_SSH_ASKPASS "SSH_ASKPASS" /* askpass program */
|
|
|
+
|
|
|
+/* Prefix string of HTTP_PROXY */
|
|
|
+#define HTTP_PROXY_PREFIX "http://"
|
|
|
+#define PROXY_AUTH_NONE 0
|
|
|
+#define PROXY_AUTH_BASIC 1
|
|
|
+#define PROXY_AUTH_DIGEST 2
|
|
|
+int proxy_auth_type = PROXY_AUTH_NONE;
|
|
|
+
|
|
|
+/* reason of end repeating */
|
|
|
+#define REASON_UNK -2
|
|
|
+#define REASON_ERROR -1
|
|
|
+#define REASON_CLOSED_BY_LOCAL 0
|
|
|
+#define REASON_CLOSED_BY_REMOTE 1
|
|
|
+
|
|
|
+/* return value of relay start function. */
|
|
|
+#define START_ERROR -1
|
|
|
+#define START_OK 0
|
|
|
+#define START_RETRY 1
|
|
|
+
|
|
|
+/* socket related definitions */
|
|
|
+#ifndef _WIN32
|
|
|
+#define SOCKET int
|
|
|
+#endif
|
|
|
+#ifndef SOCKET_ERROR
|
|
|
+#define SOCKET_ERROR -1
|
|
|
+#endif
|
|
|
+
|
|
|
+#ifdef _WIN32
|
|
|
+#define socket_errno() WSAGetLastError()
|
|
|
+#else /* !_WIN32 */
|
|
|
+#define closesocket close
|
|
|
+#define socket_errno() (errno)
|
|
|
+#endif /* !_WIN32 */
|
|
|
+
|
|
|
+#ifdef _WIN32
|
|
|
+#define popen _popen
|
|
|
+#endif /* WIN32 */
|
|
|
+
|
|
|
+/* packet operation macro */
|
|
|
+#define PUT_BYTE(ptr,data) (*(unsigned char*)ptr = data)
|
|
|
+
|
|
|
+/* debug message output */
|
|
|
+void
|
|
|
+debug( const char *fmt, ... )
|
|
|
+{
|
|
|
+ va_list args;
|
|
|
+ if ( f_debug ) {
|
|
|
+ va_start( args, fmt );
|
|
|
+ fprintf(stderr, "DEBUG: ");
|
|
|
+ vfprintf( stderr, fmt, args );
|
|
|
+ va_end( args );
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+void
|
|
|
+debug_( const char *fmt, ... ) /* without prefix */
|
|
|
+{
|
|
|
+ va_list args;
|
|
|
+ if ( f_debug ) {
|
|
|
+ va_start( args, fmt );
|
|
|
+ vfprintf( stderr, fmt, args );
|
|
|
+ va_end( args );
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+/* error message output */
|
|
|
+void
|
|
|
+error( const char *fmt, ... )
|
|
|
+{
|
|
|
+ va_list args;
|
|
|
+ va_start( args, fmt );
|
|
|
+ fprintf(stderr, "ERROR: ");
|
|
|
+ vfprintf( stderr, fmt, args );
|
|
|
+ va_end( args );
|
|
|
+}
|
|
|
+
|
|
|
+void
|
|
|
+fatal( const char *fmt, ... )
|
|
|
+{
|
|
|
+ va_list args;
|
|
|
+ va_start( args, fmt );
|
|
|
+ fprintf(stderr, "FATAL: ");
|
|
|
+ vfprintf( stderr, fmt, args );
|
|
|
+ va_end( args );
|
|
|
+ exit (EXIT_FAILURE);
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+void *
|
|
|
+xmalloc (size_t size)
|
|
|
+{
|
|
|
+ void *ret = malloc(size);
|
|
|
+ if (ret == NULL)
|
|
|
+ fatal("Cannot allocate memory: %d bytes.\n", size);
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+char *
|
|
|
+downcase( char *str )
|
|
|
+{
|
|
|
+ char *buf = str;
|
|
|
+ while ( *buf ) {
|
|
|
+ if ( isupper(*buf) )
|
|
|
+ *buf += 'a'-'A';
|
|
|
+ buf++;
|
|
|
+ }
|
|
|
+ return str; /* return converted arg */
|
|
|
+}
|
|
|
+
|
|
|
+char *
|
|
|
+expand_host_and_port (const char *fmt, const char *host, int port)
|
|
|
+{
|
|
|
+ const char *src;
|
|
|
+ char *buf, *dst, *ptr;
|
|
|
+ size_t len = strlen(fmt) + strlen(host) + 20;
|
|
|
+ buf = xmalloc (len);
|
|
|
+ dst = buf;
|
|
|
+ src = fmt;
|
|
|
+
|
|
|
+ while (*src) {
|
|
|
+ if (*src == '%') {
|
|
|
+ switch (src[1]) {
|
|
|
+ case 'h':
|
|
|
+ strcpy (dst, host);
|
|
|
+ src += 2;
|
|
|
+ break;
|
|
|
+ case 'p':
|
|
|
+ snprintf (dst, len, "%d", port);
|
|
|
+ src += 2;
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ src ++;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ dst = buf + strlen (buf);
|
|
|
+ } else if (*src == '\\') {
|
|
|
+ switch (src[1]) {
|
|
|
+ case 'r': /* CR */
|
|
|
+ *dst++ = '\r';
|
|
|
+ src += 2;
|
|
|
+ break;
|
|
|
+ case 'n': /* LF */
|
|
|
+ *dst++ = '\n';
|
|
|
+ src += 2;
|
|
|
+ break;
|
|
|
+ case 't': /* TAB */
|
|
|
+ *dst++ = '\t';
|
|
|
+ src += 2;
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ src ++;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ /* usual */
|
|
|
+ *dst++ = *src++;
|
|
|
+ }
|
|
|
+ *dst = '\0';
|
|
|
+ }
|
|
|
+ assert (strlen(buf) < len);
|
|
|
+ return buf;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+int
|
|
|
+lookup_resolve( const char *str )
|
|
|
+{
|
|
|
+ char *buf = strdup( str );
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ downcase( buf );
|
|
|
+ if ( strcmp( buf, "both" ) == 0 )
|
|
|
+ ret = RESOLVE_BOTH;
|
|
|
+ else if ( strcmp( buf, "remote" ) == 0 )
|
|
|
+ ret = RESOLVE_REMOTE;
|
|
|
+ else if ( strcmp( buf, "local" ) == 0 )
|
|
|
+ ret = RESOLVE_LOCAL;
|
|
|
+ else if ( strspn(buf, dotdigits) == strlen(buf) ) {
|
|
|
+#ifndef WITH_RESOLVER
|
|
|
+ fatal("Sorry, you can't specify to resolve the hostname with the -R option on Win32 environment.");
|
|
|
+#endif /* not WITH_RESOLVER */
|
|
|
+ ret = RESOLVE_LOCAL; /* this case is also 'local' */
|
|
|
+ socks_ns.sin_addr.s_addr = inet_addr(buf);
|
|
|
+ socks_ns.sin_family = AF_INET;
|
|
|
+ }
|
|
|
+ else
|
|
|
+ ret = RESOLVE_UNKNOWN;
|
|
|
+ free(buf);
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+char *
|
|
|
+getusername(void)
|
|
|
+{
|
|
|
+#ifdef _WIN32
|
|
|
+ static char buf[1024];
|
|
|
+ DWORD size = sizeof(buf);
|
|
|
+ buf[0] = '\0';
|
|
|
+ GetUserName( buf, &size);
|
|
|
+ return buf;
|
|
|
+#else /* not _WIN32 */
|
|
|
+ struct passwd *pw = getpwuid(getuid());
|
|
|
+ if ( pw == NULL )
|
|
|
+ fatal("getpwuid() failed for uid: %d\n", getuid());
|
|
|
+ return pw->pw_name;
|
|
|
+#endif /* not _WIN32 */
|
|
|
+}
|
|
|
+
|
|
|
+/* expect
|
|
|
+ check STR is begin with substr with case-ignored comparison.
|
|
|
+ Return 1 if matched, otherwise 0.
|
|
|
+*/
|
|
|
+int
|
|
|
+expect( char *str, char *substr)
|
|
|
+{
|
|
|
+ int len = strlen(substr);
|
|
|
+ while ( 0 < len-- ) {
|
|
|
+ if ( toupper(*str) != toupper(*substr) )
|
|
|
+ return 0; /* not matched */
|
|
|
+ str++, substr++;
|
|
|
+ }
|
|
|
+ return 1; /* good, matched */
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/** PARAMETER operation **/
|
|
|
+#define PARAMETER_FILE "/etc/connectrc"
|
|
|
+#define PARAMETER_DOTFILE ".connectrc"
|
|
|
+typedef struct {
|
|
|
+ char* name;
|
|
|
+ char* value;
|
|
|
+} PARAMETER_ITEM;
|
|
|
+PARAMETER_ITEM parameter_table[] = {
|
|
|
+ { ENV_SOCKS_SERVER, NULL },
|
|
|
+ { ENV_SOCKS5_SERVER, NULL },
|
|
|
+ { ENV_SOCKS4_SERVER, NULL },
|
|
|
+ { ENV_SOCKS_RESOLVE, NULL },
|
|
|
+ { ENV_SOCKS5_RESOLVE, NULL },
|
|
|
+ { ENV_SOCKS4_RESOLVE, NULL },
|
|
|
+ { ENV_SOCKS5_USER, NULL },
|
|
|
+ { ENV_SOCKS5_PASSWD, NULL },
|
|
|
+ { ENV_SOCKS5_PASSWORD, NULL },
|
|
|
+ { ENV_HTTP_PROXY, NULL },
|
|
|
+ { ENV_HTTP_PROXY_USER, NULL },
|
|
|
+ { ENV_HTTP_PROXY_PASSWORD, NULL },
|
|
|
+ { ENV_CONNECT_USER, NULL },
|
|
|
+ { ENV_CONNECT_PASSWORD, NULL },
|
|
|
+ { ENV_SSH_ASKPASS, NULL },
|
|
|
+ { ENV_SOCKS5_DIRECT, NULL },
|
|
|
+ { ENV_SOCKS4_DIRECT, NULL },
|
|
|
+ { ENV_SOCKS_DIRECT, NULL },
|
|
|
+ { ENV_HTTP_DIRECT, NULL },
|
|
|
+ { ENV_CONNECT_DIRECT, NULL },
|
|
|
+ { ENV_SOCKS5_AUTH, NULL },
|
|
|
+ { NULL, NULL }
|
|
|
+};
|
|
|
+
|
|
|
+PARAMETER_ITEM*
|
|
|
+find_parameter_item(const char* name)
|
|
|
+{
|
|
|
+ int i;
|
|
|
+ for( i = 0; parameter_table[i].name != NULL; i++ ){
|
|
|
+ if ( strcmp(name, parameter_table[i].name) == 0 )
|
|
|
+ return ¶meter_table[i];
|
|
|
+ }
|
|
|
+ return NULL;
|
|
|
+}
|
|
|
+
|
|
|
+void
|
|
|
+read_parameter_file_1(const char* name)
|
|
|
+{
|
|
|
+ FILE* f;
|
|
|
+ int line;
|
|
|
+ char lbuf[1025];
|
|
|
+ f = fopen(name, "r");
|
|
|
+ if( f ){
|
|
|
+ debug("Reading parameter file(%s)\n", name);
|
|
|
+ for ( line = 1; fgets(lbuf, 1024, f); line++ ) {
|
|
|
+ char *p, *q, *param, *value;
|
|
|
+ p = strchr(lbuf, '\n');
|
|
|
+ if ( p == NULL )
|
|
|
+ fatal("%s:%d: buffer overflow\n", name, line);
|
|
|
+ *p = '\0';
|
|
|
+ p = strchr(lbuf, '#');
|
|
|
+ if ( p )
|
|
|
+ *p = '\0';
|
|
|
+ for ( p = lbuf; *p; p++ )
|
|
|
+ if( *p != ' ' && *p != '\t' ) break;
|
|
|
+ if ( *p == '\0' ) continue;
|
|
|
+ param = p;
|
|
|
+ p = strchr(p, '=');
|
|
|
+ if ( p == NULL ) {
|
|
|
+ error("%s:%d: missing equal sign\n", name, line);
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+ for ( q = p - 1; q >= lbuf; q-- )
|
|
|
+ if ( *q != ' ' && *q != '\t' ) break;
|
|
|
+ *++q = '\0';
|
|
|
+ for ( ++p; *p; p++ )
|
|
|
+ if ( *p != ' ' && *p != '\t' ) break;
|
|
|
+ value = p;
|
|
|
+ for ( ; *p; p++ );
|
|
|
+ for ( p--; p >= lbuf; p-- )
|
|
|
+ if ( *p != ' ' && *p != '\t' ) break;
|
|
|
+ *++p = '\0';
|
|
|
+ if ( param && value ) {
|
|
|
+ PARAMETER_ITEM *item;
|
|
|
+ item = find_parameter_item(param);
|
|
|
+ if ( item == NULL ) {
|
|
|
+ error("%s:%d: unknown parameter `%s'\n", name, line, param);
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+ item->value = strdup(value);
|
|
|
+ debug("Parameter `%s' is set to `%s'\n", param, value);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+void
|
|
|
+read_parameter_file(void)
|
|
|
+{
|
|
|
+#if !defined(_WIN32) || defined(cygwin)
|
|
|
+ char *name;
|
|
|
+ struct passwd *pw;
|
|
|
+#endif
|
|
|
+
|
|
|
+ read_parameter_file_1(PARAMETER_FILE);
|
|
|
+#if !defined(_WIN32) || defined(cygwin)
|
|
|
+ pw = getpwuid(getuid());
|
|
|
+ if ( pw == NULL )
|
|
|
+ fatal("getpwuid() failed for uid: %d\n", getuid());
|
|
|
+ name = xmalloc(strlen(pw->pw_dir) + strlen(PARAMETER_DOTFILE) + 2);
|
|
|
+ strcpy(name, pw->pw_dir);
|
|
|
+ strcat(name, "/" PARAMETER_DOTFILE);
|
|
|
+ read_parameter_file_1(name);
|
|
|
+ free(name);
|
|
|
+#endif /* _WIN32 */
|
|
|
+}
|
|
|
+
|
|
|
+char*
|
|
|
+getparam(const char* name)
|
|
|
+{
|
|
|
+ char *value = getenv(name);
|
|
|
+ if ( value == NULL ){
|
|
|
+ PARAMETER_ITEM *item = find_parameter_item(name);
|
|
|
+ if ( item != NULL )
|
|
|
+ value = item->value;
|
|
|
+ }
|
|
|
+ return value;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/** DIRECT connection **/
|
|
|
+#define MAX_DIRECT_ADDR_LIST 256
|
|
|
+
|
|
|
+struct ADDRPAIR {
|
|
|
+ struct in_addr addr;
|
|
|
+ struct in_addr mask;
|
|
|
+ char *name;
|
|
|
+ int negative;
|
|
|
+};
|
|
|
+
|
|
|
+struct ADDRPAIR direct_addr_list[MAX_DIRECT_ADDR_LIST];
|
|
|
+int n_direct_addr_list = 0;
|
|
|
+
|
|
|
+void
|
|
|
+mask_addr (void *addr, void *mask, int addrlen)
|
|
|
+{
|
|
|
+ char *a, *m;
|
|
|
+ a = addr;
|
|
|
+ m = mask;
|
|
|
+ while ( 0 < addrlen-- )
|
|
|
+ *a++ &= *m++;
|
|
|
+}
|
|
|
+
|
|
|
+int
|
|
|
+add_direct_addr (struct in_addr *addr, struct in_addr *mask, int negative)
|
|
|
+{
|
|
|
+ struct in_addr iaddr;
|
|
|
+ char *s;
|
|
|
+ if ( MAX_DIRECT_ADDR_LIST <= n_direct_addr_list ) {
|
|
|
+ error("direct address table is full!\n");
|
|
|
+ return -1;
|
|
|
+ }
|
|
|
+ iaddr = *addr;
|
|
|
+ mask_addr(&iaddr, mask, sizeof(iaddr));
|
|
|
+ s = strdup(inet_ntoa(iaddr));
|
|
|
+ debug("adding direct addr entry: %s%s/%s\n",
|
|
|
+ negative? "!": "", s, inet_ntoa(*mask));
|
|
|
+ free(s);
|
|
|
+ memcpy( &direct_addr_list[n_direct_addr_list].addr,
|
|
|
+ &iaddr, sizeof(iaddr));
|
|
|
+ memcpy( &direct_addr_list[n_direct_addr_list].mask,
|
|
|
+ mask, sizeof(*mask));
|
|
|
+ direct_addr_list[n_direct_addr_list].name = NULL;
|
|
|
+ direct_addr_list[n_direct_addr_list].negative = negative;
|
|
|
+ n_direct_addr_list++;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/* add domain/host name entry to direct name table */
|
|
|
+int
|
|
|
+add_direct_host( const char *name, int negative)
|
|
|
+{
|
|
|
+ if ( MAX_DIRECT_ADDR_LIST <= n_direct_addr_list ) {
|
|
|
+ error("direct address table is full!\n");
|
|
|
+ return -1;
|
|
|
+ }
|
|
|
+ if (*name == '*')
|
|
|
+ name++;
|
|
|
+ if (*name == '.')
|
|
|
+ name++;
|
|
|
+ debug("adding direct name entry: %s%s\n", negative? "!": "", name);
|
|
|
+ direct_addr_list[n_direct_addr_list].name = downcase(strdup(name));
|
|
|
+ direct_addr_list[n_direct_addr_list].negative = negative;
|
|
|
+ n_direct_addr_list++;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+int
|
|
|
+parse_addr_pair (const char *str, struct in_addr *addr, struct in_addr *mask)
|
|
|
+{
|
|
|
+ /* NOTE: */
|
|
|
+ /* Assume already be splitted by separator
|
|
|
+ and formatted as folowing:
|
|
|
+ 1) 12.34.56.789/255.255.255.0
|
|
|
+ 2) 12.34.56.789/24
|
|
|
+ 3) 12.34.56.
|
|
|
+ All above generates same addr/mask pair 12.34.56.0 and 255.255.255.0
|
|
|
+ */
|
|
|
+ const char *ptr;
|
|
|
+ u_char *dsta, *dstm;
|
|
|
+ int i, n;
|
|
|
+
|
|
|
+ assert( str != NULL );
|
|
|
+ addr->s_addr = 0;
|
|
|
+ mask->s_addr = 0;
|
|
|
+ ptr = str;
|
|
|
+ dsta = (u_char*)&addr->s_addr;
|
|
|
+ dstm = (u_char*)&mask->s_addr;
|
|
|
+ for (i=0; i<4; i++ ) {
|
|
|
+ if ( *ptr == '\0' )
|
|
|
+ break; /* case of format #3 */
|
|
|
+ if ( !isdigit(*ptr) )
|
|
|
+ return -1; /* format error: */
|
|
|
+ *dsta++ = atoi( ptr );
|
|
|
+ *dstm++ = 255; /* automatic mask for format #3 */
|
|
|
+ while ( isdigit(*ptr) ) /* skip digits */
|
|
|
+ ptr++;
|
|
|
+ if ( *ptr == '.' )
|
|
|
+ ptr++;
|
|
|
+ else
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ /* At this point, *ptr points '/' or EOS ('\0') */
|
|
|
+ if ( *ptr == '\0' )
|
|
|
+ return 0; /* complete as format #3 */
|
|
|
+ if ( *ptr != '/' )
|
|
|
+ return -1; /* format error */
|
|
|
+ /* Now parse mask for format #1 or #2 */
|
|
|
+ ptr++;
|
|
|
+ mask->s_addr = 0; /* clear automatic mask */
|
|
|
+
|
|
|
+ if ( strchr( ptr, '.') ) {
|
|
|
+ /* case of format #1 */
|
|
|
+ dstm = (u_char*)&mask->s_addr;
|
|
|
+ for (i=0; i<4; i++) {
|
|
|
+ if ( !isdigit(*ptr) )
|
|
|
+ return -1; /* format error: */
|
|
|
+ *dstm++ = atoi(ptr);
|
|
|
+ while ( isdigit(*ptr) ) /* skip digits */
|
|
|
+ ptr++;
|
|
|
+ if ( *ptr == '.' )
|
|
|
+ ptr++;
|
|
|
+ else
|
|
|
+ break; /* from for loop */
|
|
|
+ }
|
|
|
+ /* complete as format #1 */
|
|
|
+ } else {
|
|
|
+ /* case of format #2 */
|
|
|
+ if ( !isdigit(*ptr) )
|
|
|
+ return -1; /* format error: */
|
|
|
+ n = atoi(ptr);
|
|
|
+ if ( n<0 || 32<n)
|
|
|
+ return -1; /* format error */
|
|
|
+ mask->s_addr = (n==0)? 0: htonl(((u_long)0xFFFFFFFF)<<(32-n));
|
|
|
+ /* complete as format #1 */
|
|
|
+ }
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+void
|
|
|
+initialize_direct_addr (void)
|
|
|
+{
|
|
|
+ int negative;
|
|
|
+ int n_entries;
|
|
|
+ char *env = NULL, *beg, *next, *envkey = NULL;
|
|
|
+ struct in_addr addr, mask;
|
|
|
+
|
|
|
+ if ( relay_method == METHOD_SOCKS ){
|
|
|
+ if ( socks_version == 5 )
|
|
|
+ envkey = ENV_SOCKS5_DIRECT;
|
|
|
+ else
|
|
|
+ envkey = ENV_SOCKS4_DIRECT;
|
|
|
+ env = getparam(envkey);
|
|
|
+ if ( env == NULL )
|
|
|
+ env = getparam(ENV_SOCKS_DIRECT);
|
|
|
+ } else if ( relay_method == METHOD_HTTP ){
|
|
|
+ env = getparam(ENV_HTTP_DIRECT);
|
|
|
+ }
|
|
|
+
|
|
|
+ if ( env == NULL )
|
|
|
+ env = getparam(ENV_CONNECT_DIRECT);
|
|
|
+
|
|
|
+ if ( env == NULL )
|
|
|
+ return; /* no entry */
|
|
|
+ debug("making direct addr list from: '%s'\n", env);
|
|
|
+ env = strdup( env ); /* reallocate to modify */
|
|
|
+ beg = next = env;
|
|
|
+ n_entries = 0;
|
|
|
+ do {
|
|
|
+ if ( MAX_DIRECT_ADDR_LIST <= n_entries ) {
|
|
|
+ error("too many entries in %s", envkey);
|
|
|
+ break; /* from do loop */
|
|
|
+ }
|
|
|
+ next = strchr( beg, ',');
|
|
|
+ if ( next != NULL )
|
|
|
+ *next++ = '\0';
|
|
|
+ addr.s_addr = 0;
|
|
|
+ mask.s_addr = 0;
|
|
|
+ if (*beg == '!') {
|
|
|
+ negative = 1;
|
|
|
+ beg++;
|
|
|
+ } else
|
|
|
+ negative = 0;
|
|
|
+ if ( !parse_addr_pair( beg, &addr, &mask ) ) {
|
|
|
+ add_direct_addr( &addr, &mask, negative );
|
|
|
+ } else {
|
|
|
+ add_direct_host( beg, negative );
|
|
|
+ }
|
|
|
+ if ( next != NULL )
|
|
|
+ beg = next;
|
|
|
+ } while ( next != NULL );
|
|
|
+
|
|
|
+ free( env );
|
|
|
+ return;
|
|
|
+}
|
|
|
+
|
|
|
+int
|
|
|
+cmp_addr (void *addr1, void *addr2, int addrlen)
|
|
|
+{
|
|
|
+ return memcmp( addr1, addr2, addrlen );
|
|
|
+}
|
|
|
+
|
|
|
+int
|
|
|
+is_direct_address (const struct in_addr addr)
|
|
|
+{
|
|
|
+ int i, neg;
|
|
|
+ struct in_addr iaddr;
|
|
|
+
|
|
|
+ /* Note: assume IPV4 address !! */
|
|
|
+ for (i=0; i<n_direct_addr_list; i++ ) {
|
|
|
+ if (direct_addr_list[i].name != NULL)
|
|
|
+ continue; /* it's name entry */
|
|
|
+ neg = direct_addr_list[i].negative;
|
|
|
+ iaddr = addr;
|
|
|
+ mask_addr( &iaddr, &direct_addr_list[i].mask,
|
|
|
+ sizeof(struct in_addr));
|
|
|
+ if (cmp_addr(&iaddr, &direct_addr_list[i].addr,
|
|
|
+ sizeof(struct in_addr)) == 0) {
|
|
|
+ char *a, *m;
|
|
|
+ a = strdup(inet_ntoa(direct_addr_list[i].addr));
|
|
|
+ m = strdup(inet_ntoa(direct_addr_list[i].mask));
|
|
|
+ debug("match with: %s/%s%s\n", a, m, neg? " (negative)": "");
|
|
|
+ free(a);
|
|
|
+ free(m);
|
|
|
+ return !neg? 1: 0;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ debug("not matched, addr to be relayed: %s\n", inet_ntoa(addr));
|
|
|
+ return 0; /* not direct */
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/* check s1 is ends with s2.
|
|
|
+ return 1 if exact match or domain part match.
|
|
|
+ return 0 if s1 is shorter than s2 or partial match.
|
|
|
+ For example,
|
|
|
+ ends_with("bar.com", "bar.com") => 1 (exact match)
|
|
|
+ ends_with("foo.bar.com", "bar.com") => 1 (domain match)
|
|
|
+ ends_with("foo.beebar.com", "bar.com") => 0 (partial match)
|
|
|
+ ends_with("bar", "bar.com") => 0 (shorter)
|
|
|
+ */
|
|
|
+domain_match(const char *s1, const char *s2)
|
|
|
+{
|
|
|
+ int len1, len2;
|
|
|
+ const char *tail1, *tail2;
|
|
|
+ len1 = strlen(s1);
|
|
|
+ len2 = strlen(s2);
|
|
|
+ if (len1 < len2 || len1 == 0 || len2 == 0)
|
|
|
+ return 0; /* not match */
|
|
|
+ tail1 = s1 + len1;
|
|
|
+ tail2 = s2 + len2;
|
|
|
+ while (0 < len1 && 0 < len2) {
|
|
|
+ if (*--tail1 != *--tail2)
|
|
|
+ break; /* not match */
|
|
|
+ len1--, len2--;
|
|
|
+ }
|
|
|
+ if (len2 != 0)
|
|
|
+ return 0; /* not match */
|
|
|
+ /* Now exact match, domain match or partial match.
|
|
|
+ Return true if exact or domain match.
|
|
|
+ Or continue checking. */
|
|
|
+ if (tail1 == s1 || tail1[-1] == '.')
|
|
|
+ return 1; /* match! */
|
|
|
+ return 0; /* not match */
|
|
|
+}
|
|
|
+
|
|
|
+/* Check given NAME is ends with one of
|
|
|
+ registered direct name entry.
|
|
|
+ Return 1 if matched, or 0.
|
|
|
+*/
|
|
|
+int
|
|
|
+is_direct_name (const char *name)
|
|
|
+{
|
|
|
+ int len, i;
|
|
|
+ const char *tail;
|
|
|
+ debug("checking %s is for direct?\n", name);
|
|
|
+ name = downcase(strdup(name));
|
|
|
+ len = strlen(name);
|
|
|
+ if (len < 1)
|
|
|
+ return 0; /* false */
|
|
|
+ tail = &name[len];
|
|
|
+ for (i=0; i<n_direct_addr_list; i++ ) {
|
|
|
+ int dlen, neg;
|
|
|
+ const char *dname;
|
|
|
+ const char *n, *d;
|
|
|
+ dname = direct_addr_list[i].name;
|
|
|
+ if (dname == NULL)
|
|
|
+ continue; /* it's addr/mask entry */
|
|
|
+ neg = direct_addr_list[i].negative;
|
|
|
+ if (domain_match(name, dname)) {
|
|
|
+ debug("match with: %s%s\n", dname, neg? " (negative)": "");
|
|
|
+ if (neg) {
|
|
|
+ return 0; /* not direct */
|
|
|
+ } else {
|
|
|
+ return 1; /* direct*/
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return 0; /* not matched */
|
|
|
+}
|
|
|
+
|
|
|
+/* check to connect to HOST directyly?
|
|
|
+ return 1 if to be direct, 0 for else. */
|
|
|
+int
|
|
|
+check_direct(const char *host)
|
|
|
+{
|
|
|
+ struct in_addr addr;
|
|
|
+ addr.s_addr = inet_addr(host);
|
|
|
+ if (addr.s_addr != INADDR_NONE) {
|
|
|
+ /* case of IP address */
|
|
|
+ if (is_direct_address(addr)) {
|
|
|
+ debug("%s is for direct.\n", host);
|
|
|
+ return 1; /* true */
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ /* case of hostname */
|
|
|
+ if (is_direct_name(host)) {
|
|
|
+ debug("%s is for direct.\n", host);
|
|
|
+ return 1; /* true */
|
|
|
+ }
|
|
|
+ }
|
|
|
+ debug("%s is for not direct.\n", host);
|
|
|
+ return 0; /* false */
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/** TTY operation **/
|
|
|
+
|
|
|
+int intr_flag = 0;
|
|
|
+
|
|
|
+#ifndef _WIN32
|
|
|
+void
|
|
|
+intr_handler(int sig)
|
|
|
+{
|
|
|
+ intr_flag = 1;
|
|
|
+}
|
|
|
+
|
|
|
+void
|
|
|
+tty_change_echo(int fd, int enable)
|
|
|
+{
|
|
|
+ static struct termios ntio, otio; /* new/old termios */
|
|
|
+ static sigset_t nset, oset; /* new/old sigset */
|
|
|
+ static struct sigaction nsa, osa; /* new/old sigaction */
|
|
|
+ static int disabled = 0;
|
|
|
+
|
|
|
+ if ( disabled && enable ) {
|
|
|
+ /* enable echo */
|
|
|
+ tcsetattr(fd, TCSANOW, &otio);
|
|
|
+ disabled = 0;
|
|
|
+ /* resotore sigaction */
|
|
|
+ sigprocmask(SIG_SETMASK, &oset, NULL);
|
|
|
+ sigaction(SIGINT, &osa, NULL);
|
|
|
+ if ( intr_flag != 0 ) {
|
|
|
+ /* re-generate signal */
|
|
|
+ kill(getpid(), SIGINT);
|
|
|
+ sigemptyset(&nset);
|
|
|
+ sigsuspend(&nset);
|
|
|
+ intr_flag = 0;
|
|
|
+ }
|
|
|
+ } else if (!disabled && !enable) {
|
|
|
+ /* set SIGINTR handler and break syscall on singal */
|
|
|
+ sigemptyset(&nset);
|
|
|
+ sigaddset(&nset, SIGTSTP);
|
|
|
+ sigprocmask(SIG_BLOCK, &nset, &oset);
|
|
|
+ intr_flag = 0;
|
|
|
+ memset(&nsa, 0, sizeof(nsa));
|
|
|
+ nsa.sa_handler = intr_handler;
|
|
|
+ sigaction(SIGINT, &nsa, &osa);
|
|
|
+ /* disable echo */
|
|
|
+ if (tcgetattr(fd, &otio) == 0 && (otio.c_lflag & ECHO)) {
|
|
|
+ disabled = 1;
|
|
|
+ ntio = otio;
|
|
|
+ ntio.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
|
|
|
+ (void) tcsetattr(fd, TCSANOW, &ntio);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return;
|
|
|
+}
|
|
|
+
|
|
|
+#define TTY_NAME "/dev/tty"
|
|
|
+int
|
|
|
+tty_readpass( const char *prompt, char *buf, size_t size )
|
|
|
+{
|
|
|
+ int tty, ret = 0;
|
|
|
+
|
|
|
+ tty = open(TTY_NAME, O_RDWR);
|
|
|
+ if ( tty < 0 ) {
|
|
|
+ error("Unable to open %s\n", TTY_NAME);
|
|
|
+ return -1; /* can't open tty */
|
|
|
+ }
|
|
|
+ if ( size <= 0 )
|
|
|
+ return -1; /* no room */
|
|
|
+ write(tty, prompt, strlen(prompt));
|
|
|
+ buf[0] = '\0';
|
|
|
+ tty_change_echo(tty, 0); /* disable echo */
|
|
|
+ ret = read(tty,buf, size-1);
|
|
|
+ tty_change_echo(tty, 1); /* restore */
|
|
|
+ write(tty, "\n", 1); /* new line */
|
|
|
+ close(tty);
|
|
|
+ if ( strchr(buf,'\n') == NULL )
|
|
|
+ return -1;
|
|
|
+ if ( 0 < ret )
|
|
|
+ buf[ret] = '\0';
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+#else /* _WIN32 */
|
|
|
+
|
|
|
+BOOL __stdcall
|
|
|
+w32_intr_handler(DWORD dwCtrlType)
|
|
|
+{
|
|
|
+ if ( dwCtrlType == CTRL_C_EVENT ) {
|
|
|
+ intr_flag = 1;
|
|
|
+ return TRUE;
|
|
|
+ } else {
|
|
|
+ return FALSE;
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+#define tty_readpass w32_tty_readpass
|
|
|
+int
|
|
|
+w32_tty_readpass( const char *prompt, char *buf, size_t size )
|
|
|
+{
|
|
|
+ HANDLE in = CreateFile("CONIN$", GENERIC_READ|GENERIC_WRITE,
|
|
|
+ 0, NULL, OPEN_EXISTING, 0, NULL);
|
|
|
+ HANDLE out = CreateFile("CONOUT$", GENERIC_WRITE,
|
|
|
+ 0, NULL, OPEN_EXISTING, 0, NULL);
|
|
|
+ DWORD mode;
|
|
|
+ DWORD ret, bytes;
|
|
|
+
|
|
|
+ if (in == INVALID_HANDLE_VALUE || out == INVALID_HANDLE_VALUE)
|
|
|
+ fatal("Cannot open console. (errno=%d)", GetLastError());
|
|
|
+
|
|
|
+ WriteFile(out, prompt, strlen(prompt), &bytes, 0);
|
|
|
+ SetConsoleCtrlHandler(w32_intr_handler, TRUE ); /* add handler */
|
|
|
+ GetConsoleMode(in, &mode);
|
|
|
+ SetConsoleMode(in, mode&~ENABLE_ECHO_INPUT); /* disable echo */
|
|
|
+ ret = ReadFile(in, buf, size, &bytes, 0);
|
|
|
+ SetConsoleMode(in, mode); /* enable echo */
|
|
|
+ SetConsoleCtrlHandler( w32_intr_handler, FALSE ); /* remove handler */
|
|
|
+ if ( intr_flag )
|
|
|
+ GenerateConsoleCtrlEvent(CTRL_C_EVENT, 0); /* re-signal */
|
|
|
+ WriteFile(out,"\n", 1, &bytes, 0);
|
|
|
+ CloseHandle(in);
|
|
|
+ CloseHandle(out);
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+#endif /* _WIN32 */
|
|
|
+
|
|
|
+/*** User / Password ***/
|
|
|
+
|
|
|
+/* SOCKS5 and HTTP Proxy authentication may requires username and
|
|
|
+ password. We ll give it via environment variable or tty.
|
|
|
+ Username and password for authentication are decided by
|
|
|
+ following rules:
|
|
|
+
|
|
|
+ Username is taken from
|
|
|
+ 1) server location spec (i.e. user@host:port)
|
|
|
+ 2) environment variables (see tables.1)
|
|
|
+ 3) system account name currently logged in.
|
|
|
+
|
|
|
+ Table.1 Order of environment variables for username
|
|
|
+
|
|
|
+ | SOCKS v5 | SOCKS v4 | HTTP proxy |
|
|
|
+ --+-------------+-------------+-----------------+
|
|
|
+ 1 | SOCKS45_USER | SOCKS4_USER | HTTP_PROXY_USER |
|
|
|
+ --+-------------+-------------+ |
|
|
|
+ 2 | SOCKS_USER | |
|
|
|
+ --+---------------------------+-----------------+
|
|
|
+ 3 | CONNECT_USER |
|
|
|
+ --+---------------------------------------------+
|
|
|
+
|
|
|
+ Password is taken from
|
|
|
+ 1) by environment variables (see table.2)
|
|
|
+ 2) by entering from tty.
|
|
|
+
|
|
|
+ Table.2 Order of environment variables for password
|
|
|
+
|
|
|
+ | SOCKS v5 | HTTP proxy |
|
|
|
+ --+-----------------+---------------------+
|
|
|
+ 1 | SOCKS5_PASSWD | |
|
|
|
+ --+-----------------+ HTTP_PROXY_PASSWORD |
|
|
|
+ 2 | SOCKS5_PASSWORD | |
|
|
|
+ --+-----------------+---------------------+
|
|
|
+ 3 | CONNECT_PASSWORD |
|
|
|
+ --+---------------------------------------+
|
|
|
+
|
|
|
+ Note: SOCKS5_PASSWD which is added in rev. 1.79
|
|
|
+ to share value with NEC SOCKS implementation.
|
|
|
+ */
|
|
|
+
|
|
|
+char *
|
|
|
+determine_relay_user ()
|
|
|
+{
|
|
|
+ char *user = NULL;
|
|
|
+ /* get username from environment variable, or system. */
|
|
|
+ if (relay_method == METHOD_SOCKS) {
|
|
|
+ if (user == NULL && socks_version == 5)
|
|
|
+ user = getparam (ENV_SOCKS5_USER);
|
|
|
+ if (user == NULL && socks_version == 4)
|
|
|
+ user = getparam (ENV_SOCKS4_USER);
|
|
|
+ if (user == NULL)
|
|
|
+ user = getparam (ENV_SOCKS_USER);
|
|
|
+ } else if (relay_method == METHOD_HTTP) {
|
|
|
+ if (user == NULL)
|
|
|
+ user = getparam (ENV_HTTP_PROXY_USER);
|
|
|
+ }
|
|
|
+ if (user == NULL)
|
|
|
+ user = getparam (ENV_CONNECT_USER);
|
|
|
+ /* determine relay user by system call if not yet. */
|
|
|
+ if (user == NULL)
|
|
|
+ user = getusername();
|
|
|
+ return user;
|
|
|
+}
|
|
|
+
|
|
|
+char *
|
|
|
+determine_relay_password ()
|
|
|
+{
|
|
|
+ char *pass = NULL;
|
|
|
+ if (pass == NULL && relay_method == METHOD_HTTP)
|
|
|
+ pass = getparam(ENV_HTTP_PROXY_PASSWORD);
|
|
|
+ if (pass == NULL && relay_method == METHOD_SOCKS)
|
|
|
+ pass = getparam(ENV_SOCKS5_PASSWD);
|
|
|
+ if (pass == NULL && relay_method == METHOD_SOCKS)
|
|
|
+ pass = getparam(ENV_SOCKS5_PASSWORD);
|
|
|
+ if (pass == NULL)
|
|
|
+ pass = getparam(ENV_CONNECT_PASSWORD);
|
|
|
+ return pass;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/*** network operations ***/
|
|
|
+
|
|
|
+
|
|
|
+/* set_relay()
|
|
|
+ Determine relay informations:
|
|
|
+ method, host, port, and username.
|
|
|
+ 1st arg, METHOD should be METHOD_xxx.
|
|
|
+ 2nd arg, SPEC is hostname or hostname:port or user@hostame:port.
|
|
|
+ hostname is domain name or dot notation.
|
|
|
+ If port is omitted, use 80 for METHOD_HTTP method,
|
|
|
+ use 1080 for METHOD_SOCKS method.
|
|
|
+ Username is also able to given by 3rd. format.
|
|
|
+ 2nd argument SPEC can be NULL. if NULL, use environment variable.
|
|
|
+ */
|
|
|
+int
|
|
|
+set_relay( int method, char *spec )
|
|
|
+{
|
|
|
+ char *buf, *sep, *resolve;
|
|
|
+
|
|
|
+ relay_method = method;
|
|
|
+
|
|
|
+ read_parameter_file();
|
|
|
+ initialize_direct_addr();
|
|
|
+ if (n_direct_addr_list == 0) {
|
|
|
+ debug ("No direct address are specified.\n");
|
|
|
+ } else {
|
|
|
+ debug ("%d direct address entries.\n", n_direct_addr_list);
|
|
|
+ }
|
|
|
+
|
|
|
+ switch ( method ) {
|
|
|
+ case METHOD_DIRECT:
|
|
|
+ return -1; /* nothing to do */
|
|
|
+
|
|
|
+ case METHOD_SOCKS:
|
|
|
+ if ( spec == NULL ) {
|
|
|
+ switch ( socks_version ) {
|
|
|
+ case 5:
|
|
|
+ spec = getparam(ENV_SOCKS5_SERVER);
|
|
|
+ break;
|
|
|
+ case 4:
|
|
|
+ spec = getparam(ENV_SOCKS4_SERVER);
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ if ( spec == NULL )
|
|
|
+ spec = getparam(ENV_SOCKS_SERVER);
|
|
|
+
|
|
|
+ if ( spec == NULL )
|
|
|
+ fatal("Failed to determine SOCKS server.\n");
|
|
|
+ relay_port = 1080; /* set default first */
|
|
|
+
|
|
|
+ /* determine resolve method */
|
|
|
+ if ( socks_resolve == RESOLVE_UNKNOWN ) {
|
|
|
+ if ( ((socks_version == 5) &&
|
|
|
+ ((resolve = getparam(ENV_SOCKS5_RESOLVE)) != NULL)) ||
|
|
|
+ ((socks_version == 4) &&
|
|
|
+ ((resolve = getparam(ENV_SOCKS4_RESOLVE)) != NULL)) ||
|
|
|
+ ((resolve = getparam(ENV_SOCKS_RESOLVE)) != NULL) ) {
|
|
|
+ socks_resolve = lookup_resolve( resolve );
|
|
|
+ if ( socks_resolve == RESOLVE_UNKNOWN )
|
|
|
+ fatal("Invalid resolve method: %s\n", resolve);
|
|
|
+ } else {
|
|
|
+ /* default */
|
|
|
+ if ( socks_version == 5 )
|
|
|
+ socks_resolve = RESOLVE_REMOTE;
|
|
|
+ else
|
|
|
+ socks_resolve = RESOLVE_LOCAL;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ break;
|
|
|
+
|
|
|
+ case METHOD_HTTP:
|
|
|
+ if ( spec == NULL )
|
|
|
+ spec = getparam(ENV_HTTP_PROXY);
|
|
|
+ if ( spec == NULL )
|
|
|
+ fatal("You must specify http proxy server\n");
|
|
|
+ relay_port = 80; /* set default first */
|
|
|
+ break;
|
|
|
+ case METHOD_TELNET:
|
|
|
+ if ( spec == NULL )
|
|
|
+ spec = getparam(ENV_TELNET_PROXY);
|
|
|
+ if ( spec == NULL )
|
|
|
+ fatal("You must specify telnet proxy server\n");
|
|
|
+ relay_port = 23; /* set default first */
|
|
|
+ }
|
|
|
+
|
|
|
+ if (expect( spec, HTTP_PROXY_PREFIX)) {
|
|
|
+ /* URL format like: "http://server:port/" */
|
|
|
+ /* extract server:port part */
|
|
|
+ buf = strdup( spec + strlen(HTTP_PROXY_PREFIX));
|
|
|
+ buf[strcspn(buf, "/")] = '\0';
|
|
|
+ } else {
|
|
|
+ /* assume spec is aready "server:port" format */
|
|
|
+ buf = strdup( spec );
|
|
|
+ }
|
|
|
+ spec = buf;
|
|
|
+
|
|
|
+ /* check username in spec */
|
|
|
+ sep = strchr( spec, '@' );
|
|
|
+ if ( sep != NULL ) {
|
|
|
+ *sep = '\0';
|
|
|
+ relay_user = strdup( spec );
|
|
|
+ spec = sep +1;
|
|
|
+ }
|
|
|
+ if (relay_user == NULL)
|
|
|
+ relay_user = determine_relay_user();
|
|
|
+
|
|
|
+ /* split out hostname and port number from spec */
|
|
|
+ sep = strchr(spec,':');
|
|
|
+ if ( sep == NULL ) {
|
|
|
+ /* hostname only, port is already set as default */
|
|
|
+ relay_host = strdup( spec );
|
|
|
+ } else {
|
|
|
+ /* hostname and port */
|
|
|
+ relay_port = atoi(sep+1);
|
|
|
+ *sep = '\0';
|
|
|
+ relay_host = strdup( spec );
|
|
|
+ }
|
|
|
+ free(buf);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+u_short
|
|
|
+resolve_port( const char *service )
|
|
|
+{
|
|
|
+ int port;
|
|
|
+ if ( service[strspn (service, digits)] == '\0' ) {
|
|
|
+ /* all digits, port number */
|
|
|
+ port = atoi(service);
|
|
|
+ } else {
|
|
|
+ /* treat as service name */
|
|
|
+ struct servent *ent;
|
|
|
+ ent = getservbyname( service, NULL );
|
|
|
+ if ( ent == NULL ) {
|
|
|
+ debug("Unknown service, '%s'\n", service);
|
|
|
+ port = 0;
|
|
|
+ } else {
|
|
|
+ port = ntohs(ent->s_port);
|
|
|
+ debug("service: %s => %d\n", service, port);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return (u_short)port;
|
|
|
+}
|
|
|
+
|
|
|
+void
|
|
|
+make_revstr(void)
|
|
|
+{
|
|
|
+ char *ptr;
|
|
|
+ size_t len;
|
|
|
+ ptr = strstr(rcs_revstr, ": ");
|
|
|
+ if (!ptr) {
|
|
|
+ revstr = strdup("unknown");
|
|
|
+ return;
|
|
|
+ }
|
|
|
+ ptr += 2;
|
|
|
+ /* assume subversion's keyword expansion like "Revision: 96". */
|
|
|
+ minor_version = atoi(ptr);
|
|
|
+ revstr = xmalloc(20);
|
|
|
+ snprintf(revstr, 20, "%d.%d", major_version, minor_version);
|
|
|
+}
|
|
|
+
|
|
|
+int
|
|
|
+getarg( int argc, char **argv )
|
|
|
+{
|
|
|
+ int err = 0;
|
|
|
+ char *ptr, *server = (char*)NULL;
|
|
|
+ int method = METHOD_DIRECT;
|
|
|
+
|
|
|
+ progname = *argv;
|
|
|
+ argc--, argv++;
|
|
|
+
|
|
|
+ /* check optinos */
|
|
|
+ while ( (0 < argc) && (**argv == '-') ) {
|
|
|
+ ptr = *argv + 1;
|
|
|
+ while ( *ptr ) {
|
|
|
+ switch ( *ptr ) {
|
|
|
+ case 's': /* use SOCKS */
|
|
|
+ method = METHOD_SOCKS;
|
|
|
+ break;
|
|
|
+
|
|
|
+ case 'n': /* no proxy */
|
|
|
+ method = METHOD_DIRECT;
|
|
|
+ break;
|
|
|
+
|
|
|
+ case 'h': /* use http-proxy */
|
|
|
+ method = METHOD_HTTP;
|
|
|
+ break;
|
|
|
+ case 't':
|
|
|
+ method = METHOD_TELNET;
|
|
|
+ break;
|
|
|
+
|
|
|
+ case 'S': /* specify SOCKS server */
|
|
|
+ if ( 1 < argc ) {
|
|
|
+ argv++, argc--;
|
|
|
+ method = METHOD_SOCKS;
|
|
|
+ server = *argv;
|
|
|
+ } else {
|
|
|
+ error("option '-%c' needs argument.\n", *ptr);
|
|
|
+ err++;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+
|
|
|
+ case 'H': /* specify http-proxy server */
|
|
|
+ if ( 1 < argc ) {
|
|
|
+ argv++, argc--;
|
|
|
+ method = METHOD_HTTP;
|
|
|
+ server = *argv;
|
|
|
+ } else {
|
|
|
+ error("option '-%c' needs argument.\n", *ptr);
|
|
|
+ err++;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case 'T': /* specify telnet proxy server */
|
|
|
+ if ( 1 < argc ) {
|
|
|
+ argv++, argc--;
|
|
|
+ method = METHOD_TELNET;
|
|
|
+ server = *argv;
|
|
|
+ } else {
|
|
|
+ error("option '-%c' needs argument.\n", *ptr);
|
|
|
+ err++;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+
|
|
|
+ case 'c':
|
|
|
+ if (1 < argc) {
|
|
|
+ argv++, argc--;
|
|
|
+ telnet_command = *argv;
|
|
|
+ } else {
|
|
|
+ error("option '%c' needs argument.\n", *ptr);
|
|
|
+ err++;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+
|
|
|
+ case 'P':
|
|
|
+ f_hold_session = 1;
|
|
|
+ /* without break */
|
|
|
+ case 'p': /* specify port to forward */
|
|
|
+ if ( 1 < argc ) {
|
|
|
+ argv++, argc--;
|
|
|
+ local_type = LOCAL_SOCKET;
|
|
|
+ local_port = resolve_port(*argv);
|
|
|
+ } else {
|
|
|
+ error("option '-%c' needs argument.\n", *ptr);
|
|
|
+ err++;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+
|
|
|
+#ifndef _WIN32
|
|
|
+ case 'w':
|
|
|
+ if ( 1 < argc ) {
|
|
|
+ argv++, argc--;
|
|
|
+ connect_timeout = atoi(*argv);
|
|
|
+ } else {
|
|
|
+ error("option '-%c' needs argument.\n", *ptr);
|
|
|
+ err++;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+#endif /* not _WIN32 */
|
|
|
+
|
|
|
+ case '4':
|
|
|
+ socks_version = 4;
|
|
|
+ break;
|
|
|
+
|
|
|
+ case '5':
|
|
|
+ socks_version = 5;
|
|
|
+ break;
|
|
|
+
|
|
|
+ case 'a':
|
|
|
+ if ( 1 < argc ) {
|
|
|
+ argv++, argc--;
|
|
|
+ socks5_auth = *argv;
|
|
|
+ } else {
|
|
|
+ error("option '-%c' needs argument.\n", *ptr);
|
|
|
+ err++;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+
|
|
|
+ case 'R': /* specify resolve method */
|
|
|
+ if ( 1 < argc ) {
|
|
|
+ argv++, argc--;
|
|
|
+ socks_resolve = lookup_resolve( *argv );
|
|
|
+ } else {
|
|
|
+ error("option '-%c' needs argument.\n", *ptr);
|
|
|
+ err++;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+
|
|
|
+ case 'V': /* print version */
|
|
|
+ fprintf(stderr, "%s\nVersion %s\n", progdesc, revstr);
|
|
|
+ exit(0);
|
|
|
+
|
|
|
+ case 'd': /* debug mode */
|
|
|
+ f_debug++;
|
|
|
+ break;
|
|
|
+
|
|
|
+ default:
|
|
|
+ error("unknown option '-%c'\n", *ptr);
|
|
|
+ err++;
|
|
|
+ }
|
|
|
+ ptr++;
|
|
|
+ }
|
|
|
+ argc--, argv++;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* check error */
|
|
|
+ if ( 0 < err )
|
|
|
+ goto quit;
|
|
|
+
|
|
|
+ set_relay( method, server );
|
|
|
+
|
|
|
+ /* check destination HOST (MUST) */
|
|
|
+ if ( argc == 0 ) {
|
|
|
+ fprintf(stderr, "%s\nVersion %s\n", progdesc, revstr);
|
|
|
+ fprintf(stderr, usage, progname);
|
|
|
+ exit(0);
|
|
|
+ }
|
|
|
+ dest_host = argv[0];
|
|
|
+ /* decide port or service name from programname or argument */
|
|
|
+ if ( ((ptr=strrchr( progname, '/' )) != NULL) ||
|
|
|
+ ((ptr=strchr( progname, '\\')) != NULL) )
|
|
|
+ ptr++;
|
|
|
+ else
|
|
|
+ ptr = progname;
|
|
|
+ if ( dest_port == 0 ) {
|
|
|
+ /* accept only if -P is not specified. */
|
|
|
+ if ( 1 < argc ) {
|
|
|
+ /* get port number from argument (prior to progname) */
|
|
|
+ /* NOTE: This way is for cvs ext method. */
|
|
|
+ dest_port = resolve_port(argv[1]);
|
|
|
+ } else if ( strncmp( ptr, "connect-", 8) == 0 ) {
|
|
|
+ /* decide port number from program name */
|
|
|
+ char *str = strdup( ptr+8 );
|
|
|
+ str[strcspn( str, "." )] = '\0';
|
|
|
+ dest_port = resolve_port(str);
|
|
|
+ free(str);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ /* check port number */
|
|
|
+ if ( dest_port <= 0 ) {
|
|
|
+ error( "You must specify the destination port correctly.\n");
|
|
|
+ err++;
|
|
|
+ goto quit;
|
|
|
+ }
|
|
|
+ if ( (relay_method != METHOD_DIRECT) && (relay_port <= 0) ) {
|
|
|
+ error("Invalid relay port: %d\n", dest_port);
|
|
|
+ err++;
|
|
|
+ goto quit;
|
|
|
+ }
|
|
|
+
|
|
|
+quit:
|
|
|
+ /* report for debugging */
|
|
|
+ debug("relay_method = %s (%d)\n",
|
|
|
+ method_names[relay_method], relay_method);
|
|
|
+ if ( relay_method != METHOD_DIRECT ) {
|
|
|
+ debug("relay_host=%s\n", relay_host);
|
|
|
+ debug("relay_port=%d\n", relay_port);
|
|
|
+ debug("relay_user=%s\n", relay_user);
|
|
|
+ }
|
|
|
+ if ( relay_method == METHOD_SOCKS ) {
|
|
|
+ debug("socks_version=%d\n", socks_version);
|
|
|
+ debug("socks_resolve=%s (%d)\n",
|
|
|
+ resolve_names[socks_resolve], socks_resolve);
|
|
|
+ }
|
|
|
+ debug("local_type=%s\n", local_type_names[local_type]);
|
|
|
+ if ( local_type == LOCAL_SOCKET ) {
|
|
|
+ debug("local_port=%d\n", local_port);
|
|
|
+ if (f_hold_session)
|
|
|
+ debug (" with holding remote session.\n");
|
|
|
+ }
|
|
|
+ debug("dest_host=%s\n", dest_host);
|
|
|
+ debug("dest_port=%d\n", dest_port);
|
|
|
+ if ( 0 < err ) {
|
|
|
+ fprintf(stderr, usage, progname);
|
|
|
+ exit(1);
|
|
|
+ }
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+#ifndef _WIN32
|
|
|
+/* Time-out feature is not allowed for Win32 native compilers. */
|
|
|
+/* MSVC and Borland C cannot but Cygwin and UNIXes can. */
|
|
|
+
|
|
|
+/* timeout signal hander */
|
|
|
+void
|
|
|
+sig_timeout(void)
|
|
|
+{
|
|
|
+ signal( SIGALRM, SIG_IGN );
|
|
|
+ alarm( 0 );
|
|
|
+ error( "timed out\n" );
|
|
|
+ exit(1);
|
|
|
+}
|
|
|
+
|
|
|
+/* set timeout param = seconds, 0 clears */
|
|
|
+void
|
|
|
+set_timeout(int timeout)
|
|
|
+{
|
|
|
+ /* This feature is allowed for UNIX or cygwin environments, currently */
|
|
|
+ if ( timeout == 0 ) {
|
|
|
+ debug( "clearing timeout\n" );
|
|
|
+ signal( SIGALRM, SIG_IGN );
|
|
|
+ alarm( 0 );
|
|
|
+ } else {
|
|
|
+ debug( "setting timeout: %d seconds\n", timeout );
|
|
|
+ signal(SIGALRM, (void *)sig_timeout);
|
|
|
+ alarm( timeout );
|
|
|
+ }
|
|
|
+}
|
|
|
+#endif
|
|
|
+
|
|
|
+#if !defined(_WIN32) && !defined(__CYGWIN32__)
|
|
|
+void
|
|
|
+switch_ns (struct sockaddr_in *ns)
|
|
|
+{
|
|
|
+ res_init();
|
|
|
+ memcpy (&_res.nsaddr_list[0], ns, sizeof(*ns));
|
|
|
+ _res.nscount = 1;
|
|
|
+ debug("Using nameserver at %s\n", inet_ntoa(ns->sin_addr));
|
|
|
+}
|
|
|
+#endif /* !_WIN32 && !__CYGWIN32__ */
|
|
|
+
|
|
|
+/* TODO: IPv6
|
|
|
+ TODO: fallback if askpass execution failed.
|
|
|
+ */
|
|
|
+
|
|
|
+int
|
|
|
+local_resolve (const char *host, struct sockaddr_in *addr)
|
|
|
+{
|
|
|
+ struct hostent *ent;
|
|
|
+ if ( strspn(host, dotdigits) == strlen(host) ) {
|
|
|
+ /* given by IPv4 address */
|
|
|
+ addr->sin_family = AF_INET;
|
|
|
+ addr->sin_addr.s_addr = inet_addr(host);
|
|
|
+ } else {
|
|
|
+ debug("resolving host by name: %s\n", host);
|
|
|
+ ent = gethostbyname (host);
|
|
|
+ if ( ent ) {
|
|
|
+ memcpy (&addr->sin_addr, ent->h_addr, ent->h_length);
|
|
|
+ addr->sin_family = ent->h_addrtype;
|
|
|
+ debug("resolved: %s (%s)\n",
|
|
|
+ host, inet_ntoa(addr->sin_addr));
|
|
|
+ } else {
|
|
|
+ debug("failed to resolve locally.\n");
|
|
|
+ return -1; /* failed */
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return 0; /* good */
|
|
|
+}
|
|
|
+
|
|
|
+int
|
|
|
+open_connection( const char *host, u_short port )
|
|
|
+{
|
|
|
+ SOCKET s;
|
|
|
+ struct sockaddr_in saddr;
|
|
|
+
|
|
|
+ /* resolve address of proxy or direct target */
|
|
|
+ if (local_resolve (host, &saddr) < 0) {
|
|
|
+ error("can't resolve hostname: %s\n", host);
|
|
|
+ return SOCKET_ERROR;
|
|
|
+ }
|
|
|
+ saddr.sin_port = htons(port);
|
|
|
+
|
|
|
+ debug("connecting to %s:%u\n", inet_ntoa(saddr.sin_addr), port);
|
|
|
+ s = socket( AF_INET, SOCK_STREAM, 0 );
|
|
|
+ if ( connect( s, (struct sockaddr *)&saddr, sizeof(saddr))
|
|
|
+ == SOCKET_ERROR) {
|
|
|
+ debug( "connect() failed.\n");
|
|
|
+ return SOCKET_ERROR;
|
|
|
+ }
|
|
|
+ return s;
|
|
|
+}
|
|
|
+
|
|
|
+void
|
|
|
+report_text( char *prefix, char *buf )
|
|
|
+{
|
|
|
+ static char work[1024];
|
|
|
+ char *tmp;
|
|
|
+
|
|
|
+ if ( !f_debug )
|
|
|
+ return;
|
|
|
+ if ( !f_report )
|
|
|
+ return; /* don't report */
|
|
|
+ debug("%s \"", prefix);
|
|
|
+ while ( *buf ) {
|
|
|
+ memset( work, 0, sizeof(work));
|
|
|
+ tmp = work;
|
|
|
+ while ( *buf && ((tmp-work) < (int)sizeof(work)-5) ) {
|
|
|
+ switch ( *buf ) {
|
|
|
+ case '\t': *tmp++ = '\\'; *tmp++ = 't'; break;
|
|
|
+ case '\r': *tmp++ = '\\'; *tmp++ = 'r'; break;
|
|
|
+ case '\n': *tmp++ = '\\'; *tmp++ = 'n'; break;
|
|
|
+ case '\\': *tmp++ = '\\'; *tmp++ = '\\'; break;
|
|
|
+ default:
|
|
|
+ if ( isprint(*buf) ) {
|
|
|
+ *tmp++ = *buf;
|
|
|
+ } else {
|
|
|
+ int consumed = tmp - work;
|
|
|
+ snprintf( tmp, sizeof(work)-consumed,
|
|
|
+ "\\x%02X", (unsigned char)*buf);
|
|
|
+ tmp += strlen(tmp);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ buf++;
|
|
|
+ *tmp = '\0';
|
|
|
+ }
|
|
|
+ debug_("%s", work);
|
|
|
+ }
|
|
|
+
|
|
|
+ debug_("\"\n");
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+void
|
|
|
+report_bytes( char *prefix, char *buf, int len )
|
|
|
+{
|
|
|
+ if ( ! f_debug )
|
|
|
+ return;
|
|
|
+ debug( "%s", prefix );
|
|
|
+ while ( 0 < len ) {
|
|
|
+ fprintf( stderr, " %02x", *(unsigned char *)buf);
|
|
|
+ buf++;
|
|
|
+ len--;
|
|
|
+ }
|
|
|
+ fprintf(stderr, "\n");
|
|
|
+ return;
|
|
|
+}
|
|
|
+
|
|
|
+int
|
|
|
+atomic_out( SOCKET s, char *buf, int size )
|
|
|
+{
|
|
|
+ int ret, len;
|
|
|
+
|
|
|
+ assert( buf != NULL );
|
|
|
+ assert( 0<=size );
|
|
|
+ /* do atomic out */
|
|
|
+ ret = 0;
|
|
|
+ while ( 0 < size ) {
|
|
|
+ len = send( s, buf+ret, size, 0 );
|
|
|
+ if ( len == -1 )
|
|
|
+ fatal("atomic_out() failed to send(), %d\n", socket_errno());
|
|
|
+ ret += len;
|
|
|
+ size -= len;
|
|
|
+ }
|
|
|
+ if (!f_report) {
|
|
|
+ debug("atomic_out() [some bytes]\n");
|
|
|
+ debug(">>> xx xx xx xx ...\n");
|
|
|
+ } else {
|
|
|
+ debug("atomic_out() [%d bytes]\n", ret);
|
|
|
+ report_bytes(">>>", buf, ret);
|
|
|
+ }
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+int
|
|
|
+atomic_in( SOCKET s, char *buf, int size )
|
|
|
+{
|
|
|
+ int ret, len;
|
|
|
+
|
|
|
+ assert( buf != NULL );
|
|
|
+ assert( 0<=size );
|
|
|
+
|
|
|
+ /* do atomic in */
|
|
|
+ ret = 0;
|
|
|
+ while ( 0 < size ) {
|
|
|
+ len = recv( s, buf+ret, size, 0 );
|
|
|
+ if ( len == -1 ) {
|
|
|
+ fatal("atomic_in() failed to recv(), %d\n", socket_errno());
|
|
|
+ } else if ( len == 0 ) {
|
|
|
+ fatal( "Connection closed by peer.\n");
|
|
|
+ }
|
|
|
+ ret += len;
|
|
|
+ size -= len;
|
|
|
+ }
|
|
|
+ if (!f_report) {
|
|
|
+ debug("atomic_in() [some bytes]\n");
|
|
|
+ debug("<<< xx xx xx xx ...\n");
|
|
|
+ } else {
|
|
|
+ debug("atomic_in() [%d bytes]\n", ret);
|
|
|
+ report_bytes("<<<", buf, ret);
|
|
|
+ }
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+int
|
|
|
+line_input( SOCKET s, char *buf, int size )
|
|
|
+{
|
|
|
+ char *dst = buf;
|
|
|
+ if ( size == 0 )
|
|
|
+ return 0; /* no error */
|
|
|
+ size--;
|
|
|
+ while ( 0 < size ) {
|
|
|
+ switch ( recv( s, dst, 1, 0) ) { /* recv one-by-one */
|
|
|
+ case SOCKET_ERROR:
|
|
|
+ error("recv() error\n");
|
|
|
+ return -1; /* error */
|
|
|
+ case 0:
|
|
|
+ size = 0; /* end of stream */
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ /* continue reading until last 1 char is EOL? */
|
|
|
+ if ( *dst == '\n' ) {
|
|
|
+ /* finished */
|
|
|
+ size = 0;
|
|
|
+ } else {
|
|
|
+ /* more... */
|
|
|
+ size--;
|
|
|
+ }
|
|
|
+ dst++;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ *dst = '\0';
|
|
|
+ report_text( "<<<", buf);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/* cut_token()
|
|
|
+ Span token in given string STR until char in DELIM is appeared.
|
|
|
+ Then replace contiguous DELIMS with '\0' for string termination
|
|
|
+ and returns next pointer.
|
|
|
+ If no next token, return NULL.
|
|
|
+*/
|
|
|
+char *
|
|
|
+cut_token( char *str, char *delim)
|
|
|
+{
|
|
|
+ char *ptr = str + strcspn(str, delim);
|
|
|
+ char *end = ptr + strspn(ptr, delim);
|
|
|
+ if ( ptr == str )
|
|
|
+ return NULL;
|
|
|
+ while ( ptr < end )
|
|
|
+ *ptr++ = '\0';
|
|
|
+ return ptr;
|
|
|
+}
|
|
|
+
|
|
|
+const char *
|
|
|
+lookup(int num, LOOKUP_ITEM *items)
|
|
|
+{
|
|
|
+ int i = 0;
|
|
|
+ while (0 <= items[i].num) {
|
|
|
+ if (items[i].num == num)
|
|
|
+ return items[i].str;
|
|
|
+ i++;
|
|
|
+ }
|
|
|
+ return "(unknown)";
|
|
|
+}
|
|
|
+
|
|
|
+/* readpass()
|
|
|
+ password input routine
|
|
|
+ Use ssh-askpass (same mechanism to OpenSSH)
|
|
|
+*/
|
|
|
+char *
|
|
|
+readpass( const char* prompt, ...)
|
|
|
+{
|
|
|
+ static char buf[1000]; /* XXX, don't be fix length */
|
|
|
+ va_list args;
|
|
|
+ va_start(args, prompt);
|
|
|
+ vsnprintf(buf, sizeof(buf), prompt, args);
|
|
|
+ va_end(args);
|
|
|
+
|
|
|
+ if ( getparam(ENV_SSH_ASKPASS)
|
|
|
+#if !defined(_WIN32) && !defined(__CYGWIN32__)
|
|
|
+ && getenv("DISPLAY")
|
|
|
+#endif /* not _WIN32 && not __CYGWIN32__ */
|
|
|
+ ) {
|
|
|
+ /* use ssh-askpass to get password */
|
|
|
+ FILE *fp;
|
|
|
+ char *askpass = getparam(ENV_SSH_ASKPASS), *cmd;
|
|
|
+ int cmd_size = strlen(askpass) +1 +1 +strlen(buf) +1 +1;
|
|
|
+ cmd = xmalloc(cmd_size);
|
|
|
+ snprintf(cmd, cmd_size, "%s \"%s\"", askpass, buf);
|
|
|
+ fp = popen(cmd, "r");
|
|
|
+ free(cmd);
|
|
|
+ if ( fp == NULL )
|
|
|
+ return NULL; /* fail */
|
|
|
+ buf[0] = '\0';
|
|
|
+ if (fgets(buf, sizeof(buf), fp) == NULL)
|
|
|
+ return NULL; /* fail */
|
|
|
+ fclose(fp);
|
|
|
+ } else {
|
|
|
+ tty_readpass( buf, buf, sizeof(buf));
|
|
|
+ }
|
|
|
+ buf[strcspn(buf, "\r\n")] = '\0';
|
|
|
+ return buf;
|
|
|
+}
|
|
|
+
|
|
|
+static int
|
|
|
+socks5_do_auth_userpass( int s )
|
|
|
+{
|
|
|
+ unsigned char buf[1024], *ptr;
|
|
|
+ char *pass = NULL;
|
|
|
+ int len;
|
|
|
+
|
|
|
+ /* do User/Password authentication. */
|
|
|
+ /* This feature requires username and password from
|
|
|
+ command line argument or environment variable,
|
|
|
+ or terminal. */
|
|
|
+ if (relay_user == NULL)
|
|
|
+ fatal("cannot determine user name.\n");
|
|
|
+
|
|
|
+ /* get password from environment variable if exists. */
|
|
|
+ if ((pass=determine_relay_password()) == NULL &&
|
|
|
+ (pass=readpass("Enter SOCKS5 password for %s@%s: ",
|
|
|
+ relay_user, relay_host)) == NULL)
|
|
|
+ fatal("Cannot get password for user: %s\n", relay_user);
|
|
|
+
|
|
|
+ /* make authentication packet */
|
|
|
+ ptr = buf;
|
|
|
+ PUT_BYTE( ptr++, 1 ); /* subnegotiation ver.: 1 */
|
|
|
+ len = strlen( relay_user ); /* ULEN and UNAME */
|
|
|
+ PUT_BYTE( ptr++, len );
|
|
|
+ strcpy( ptr, relay_user );
|
|
|
+ ptr += len;
|
|
|
+ len = strlen( pass ); /* PLEN and PASSWD */
|
|
|
+ PUT_BYTE( ptr++, strlen(pass));
|
|
|
+ strcpy( ptr, pass );
|
|
|
+ ptr += len;
|
|
|
+ memset (pass, 0, strlen(pass)); /* erase password */
|
|
|
+
|
|
|
+ /* send it and get answer */
|
|
|
+ f_report = 0;
|
|
|
+ atomic_out( s, buf, ptr-buf );
|
|
|
+ f_report = 1;
|
|
|
+ atomic_in( s, buf, 2 );
|
|
|
+
|
|
|
+ /* check status */
|
|
|
+ if ( buf[1] == 0 )
|
|
|
+ return 0; /* success */
|
|
|
+ else
|
|
|
+ return -1; /* fail */
|
|
|
+}
|
|
|
+
|
|
|
+static const char *
|
|
|
+socks5_getauthname( int auth )
|
|
|
+{
|
|
|
+ switch ( auth ) {
|
|
|
+ case SOCKS5_AUTH_REJECT: return "REJECTED";
|
|
|
+ case SOCKS5_AUTH_NOAUTH: return "NO-AUTH";
|
|
|
+ case SOCKS5_AUTH_GSSAPI: return "GSSAPI";
|
|
|
+ case SOCKS5_AUTH_USERPASS: return "USERPASS";
|
|
|
+ case SOCKS5_AUTH_CHAP: return "CHAP";
|
|
|
+ case SOCKS5_AUTH_EAP: return "EAP";
|
|
|
+ case SOCKS5_AUTH_MAF: return "MAF";
|
|
|
+ default: return "(unknown)";
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+typedef struct {
|
|
|
+ char* name;
|
|
|
+ unsigned char auth;
|
|
|
+} AUTH_METHOD_ITEM;
|
|
|
+
|
|
|
+AUTH_METHOD_ITEM socks5_auth_table[] = {
|
|
|
+ { "none", SOCKS5_AUTH_NOAUTH },
|
|
|
+ { "gssapi", SOCKS5_AUTH_GSSAPI },
|
|
|
+ { "userpass", SOCKS5_AUTH_USERPASS },
|
|
|
+ { "chap", SOCKS5_AUTH_CHAP },
|
|
|
+ { NULL, -1 },
|
|
|
+};
|
|
|
+
|
|
|
+int
|
|
|
+socks5_auth_parse_1(char *start, char *end){
|
|
|
+ int i, len;
|
|
|
+ for ( ; *start; start++ )
|
|
|
+ if ( *start != ' ' && *start != '\t') break;
|
|
|
+ for ( end--; end >= start; end-- ) {
|
|
|
+ if ( *end != ' ' && *end != '\t'){
|
|
|
+ end++;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ len = end - start;
|
|
|
+ for ( i = 0; socks5_auth_table[i].name != NULL; i++ ){
|
|
|
+ if ( strncmp(start, socks5_auth_table[i].name, len) == 0) {
|
|
|
+ return socks5_auth_table[i].auth;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ fatal("Unknown auth method: %s\n", start);
|
|
|
+ return -1;
|
|
|
+}
|
|
|
+
|
|
|
+int
|
|
|
+socks5_auth_parse(char *start, unsigned char *auth_list, int max_auth){
|
|
|
+ char *end;
|
|
|
+ int i = 0;
|
|
|
+ while ( i < max_auth ) {
|
|
|
+ end = strchr(start, ',');
|
|
|
+ if (*start && end) {
|
|
|
+ auth_list[i++] = socks5_auth_parse_1(start, end);
|
|
|
+ start = ++end;
|
|
|
+ } else {
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ if ( *start && ( i < max_auth ) ){
|
|
|
+ for( end = start; *end; end++ );
|
|
|
+ auth_list[i++] = socks5_auth_parse_1(start, end);
|
|
|
+ } else {
|
|
|
+ fatal("Too much auth method.\n");
|
|
|
+ }
|
|
|
+ return i;
|
|
|
+}
|
|
|
+
|
|
|
+/* begin SOCKS5 relaying
|
|
|
+ And no authentication is supported.
|
|
|
+ */
|
|
|
+int
|
|
|
+begin_socks5_relay( SOCKET s )
|
|
|
+{
|
|
|
+ unsigned char buf[256], *ptr, *env = socks5_auth;
|
|
|
+ unsigned char n_auth = 0; unsigned char auth_list[10], auth_method;
|
|
|
+ int len, auth_result, i;
|
|
|
+
|
|
|
+ debug( "begin_socks_relay()\n");
|
|
|
+
|
|
|
+ /* request authentication */
|
|
|
+ ptr = buf;
|
|
|
+ PUT_BYTE( ptr++, 5); /* SOCKS version (5) */
|
|
|
+
|
|
|
+ if ( env == NULL )
|
|
|
+ env = getparam(ENV_SOCKS5_AUTH);
|
|
|
+ if ( env == NULL ) {
|
|
|
+ /* add no-auth authentication */
|
|
|
+ auth_list[n_auth++] = SOCKS5_AUTH_NOAUTH;
|
|
|
+ /* add user/pass authentication */
|
|
|
+ auth_list[n_auth++] = SOCKS5_AUTH_USERPASS;
|
|
|
+ } else {
|
|
|
+ n_auth = socks5_auth_parse(env, auth_list, 10);
|
|
|
+ }
|
|
|
+ PUT_BYTE( ptr++, n_auth); /* num auth */
|
|
|
+ for (i=0; i<n_auth; i++) {
|
|
|
+ debug("available auth method[%d] = %s (0x%02x)\n",
|
|
|
+ i, socks5_getauthname(auth_list[i]), auth_list[i]);
|
|
|
+ PUT_BYTE( ptr++, auth_list[i]); /* authentications */
|
|
|
+ }
|
|
|
+ atomic_out( s, buf, ptr-buf ); /* send requst */
|
|
|
+ atomic_in( s, buf, 2 ); /* recv response */
|
|
|
+ if ( (buf[0] != 5) || /* ver5 response */
|
|
|
+ (buf[1] == 0xFF) ) { /* check auth method */
|
|
|
+ error("No auth method accepted.\n");
|
|
|
+ return -1;
|
|
|
+ }
|
|
|
+ auth_method = buf[1];
|
|
|
+
|
|
|
+ debug("auth method: %s\n", socks5_getauthname(auth_method));
|
|
|
+
|
|
|
+ switch ( auth_method ) {
|
|
|
+ case SOCKS5_AUTH_REJECT:
|
|
|
+ error("No acceptable authentication method\n");
|
|
|
+ return -1; /* fail */
|
|
|
+
|
|
|
+ case SOCKS5_AUTH_NOAUTH:
|
|
|
+ /* nothing to do */
|
|
|
+ auth_result = 0;
|
|
|
+ break;
|
|
|
+
|
|
|
+ case SOCKS5_AUTH_USERPASS:
|
|
|
+ auth_result = socks5_do_auth_userpass(s);
|
|
|
+ break;
|
|
|
+
|
|
|
+ default:
|
|
|
+ error("Unsupported authentication method: %s\n",
|
|
|
+ socks5_getauthname( auth_method ));
|
|
|
+ return -1; /* fail */
|
|
|
+ }
|
|
|
+ if ( auth_result != 0 ) {
|
|
|
+ error("Authentication failed.\n");
|
|
|
+ return -1;
|
|
|
+ }
|
|
|
+ /* request to connect */
|
|
|
+ ptr = buf;
|
|
|
+ PUT_BYTE( ptr++, 5); /* SOCKS version (5) */
|
|
|
+ PUT_BYTE( ptr++, 1); /* CMD: CONNECT */
|
|
|
+ PUT_BYTE( ptr++, 0); /* FLG: 0 */
|
|
|
+ if ( dest_addr.sin_addr.s_addr == 0 ) {
|
|
|
+ /* resolved by SOCKS server */
|
|
|
+ PUT_BYTE( ptr++, 3); /* ATYP: DOMAINNAME */
|
|
|
+ len = strlen(dest_host);
|
|
|
+ PUT_BYTE( ptr++, len); /* DST.ADDR (len) */
|
|
|
+ memcpy( ptr, dest_host, len ); /* (hostname) */
|
|
|
+ ptr += len;
|
|
|
+ } else {
|
|
|
+ /* resolved localy */
|
|
|
+ PUT_BYTE( ptr++, 1 ); /* ATYP: IPv4 */
|
|
|
+ memcpy( ptr, &dest_addr.sin_addr.s_addr, sizeof(dest_addr.sin_addr));
|
|
|
+ ptr += sizeof(dest_addr.sin_addr);
|
|
|
+ }
|
|
|
+ PUT_BYTE( ptr++, dest_port>>8); /* DST.PORT */
|
|
|
+ PUT_BYTE( ptr++, dest_port&0xFF);
|
|
|
+ atomic_out( s, buf, ptr-buf); /* send request */
|
|
|
+ atomic_in( s, buf, 4 ); /* recv response */
|
|
|
+ if ( (buf[1] != SOCKS5_REP_SUCCEEDED) ) { /* check reply code */
|
|
|
+ error("Got error response from SOCKS server: %d (%s).\n",
|
|
|
+ buf[1], lookup(buf[1], socks5_rep_names));
|
|
|
+ return -1;
|
|
|
+ }
|
|
|
+ ptr = buf + 4;
|
|
|
+ switch ( buf[3] ) { /* case by ATYP */
|
|
|
+ case 1: /* IP v4 ADDR*/
|
|
|
+ atomic_in( s, ptr, 4+2 ); /* recv IPv4 addr and port */
|
|
|
+ break;
|
|
|
+ case 3: /* DOMAINNAME */
|
|
|
+ atomic_in( s, ptr, 1 ); /* recv name and port */
|
|
|
+ atomic_in( s, ptr+1, *(unsigned char*)ptr + 2);
|
|
|
+ break;
|
|
|
+ case 4: /* IP v6 ADDR */
|
|
|
+ atomic_in( s, ptr, 16+2 ); /* recv IPv6 addr and port */
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Conguraturation, connected via SOCKS5 server! */
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/* begin SOCKS protocol 4 relaying
|
|
|
+ And no authentication is supported.
|
|
|
+
|
|
|
+ There's SOCKS protocol version 4 and 4a. Protocol version
|
|
|
+ 4a has capability to resolve hostname by SOCKS server, so
|
|
|
+ we don't need resolving IP address of destination host on
|
|
|
+ local machine.
|
|
|
+
|
|
|
+ Environment variable SOCKS_RESOLVE directs how to resolve
|
|
|
+ IP addess. There's 3 keywords allowed; "local", "remote"
|
|
|
+ and "both" (case insensitive). Keyword "local" means taht
|
|
|
+ target host name is resolved by localhost resolver
|
|
|
+ (usualy with gethostbyname()), "remote" means by remote
|
|
|
+ SOCKS server, "both" means to try resolving by localhost
|
|
|
+ then remote.
|
|
|
+
|
|
|
+ SOCKS4 protocol and authentication of SOCKS5 protocol
|
|
|
+ requires user name on connect request.
|
|
|
+ User name is determined by following method.
|
|
|
+
|
|
|
+ 1. If server spec has user@hostname:port format then
|
|
|
+ user part is used for this SOCKS server.
|
|
|
+
|
|
|
+ 2. Get user name from environment variable LOGNAME, USER
|
|
|
+ (in this order).
|
|
|
+
|
|
|
+*/
|
|
|
+int
|
|
|
+begin_socks4_relay( SOCKET s )
|
|
|
+{
|
|
|
+ unsigned char buf[256], *ptr;
|
|
|
+
|
|
|
+ debug( "begin_socks_relay()\n");
|
|
|
+
|
|
|
+ /* make connect request packet
|
|
|
+ protocol v4:
|
|
|
+ VN:1, CD:1, PORT:2, ADDR:4, USER:n, NULL:1
|
|
|
+ protocol v4a:
|
|
|
+ VN:1, CD:1, PORT:2, DUMMY:4, USER:n, NULL:1, HOSTNAME:n, NULL:1
|
|
|
+ */
|
|
|
+ ptr = buf;
|
|
|
+ PUT_BYTE( ptr++, 4); /* protocol version (4) */
|
|
|
+ PUT_BYTE( ptr++, 1); /* CONNECT command */
|
|
|
+ PUT_BYTE( ptr++, dest_port>>8); /* destination Port */
|
|
|
+ PUT_BYTE( ptr++, dest_port&0xFF);
|
|
|
+ /* destination IP */
|
|
|
+ memcpy(ptr, &dest_addr.sin_addr, sizeof(dest_addr.sin_addr));
|
|
|
+ ptr += sizeof(dest_addr.sin_addr);
|
|
|
+ if ( dest_addr.sin_addr.s_addr == 0 )
|
|
|
+ *(ptr-1) = 1; /* fake, protocol 4a */
|
|
|
+ /* username */
|
|
|
+ if (relay_user == NULL)
|
|
|
+ fatal( "Cannot determine user name.\n");
|
|
|
+ strcpy( ptr, relay_user );
|
|
|
+ ptr += strlen( relay_user ) +1;
|
|
|
+ /* destination host name (for protocol 4a) */
|
|
|
+ if ( (socks_version == 4) && (dest_addr.sin_addr.s_addr == 0)) {
|
|
|
+ strcpy( ptr, dest_host );
|
|
|
+ ptr += strlen( dest_host ) +1;
|
|
|
+ }
|
|
|
+ /* send command and get response
|
|
|
+ response is: VN:1, CD:1, PORT:2, ADDR:4 */
|
|
|
+ atomic_out( s, buf, ptr-buf); /* send request */
|
|
|
+ atomic_in( s, buf, 8 ); /* recv response */
|
|
|
+ if ( (buf[1] != SOCKS4_REP_SUCCEEDED) ) { /* check reply code */
|
|
|
+ error("Got error response: %d: '%s'.\n",
|
|
|
+ buf[1], lookup(buf[1], socks4_rep_names));
|
|
|
+ return -1; /* failed */
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Conguraturation, connected via SOCKS4 server! */
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+int
|
|
|
+sendf(SOCKET s, const char *fmt,...)
|
|
|
+{
|
|
|
+ static char buf[10240]; /* xxx, enough? */
|
|
|
+
|
|
|
+ va_list args;
|
|
|
+ va_start( args, fmt );
|
|
|
+ vsnprintf( buf, sizeof(buf), fmt, args );
|
|
|
+ va_end( args );
|
|
|
+
|
|
|
+ report_text(">>>", buf);
|
|
|
+ if ( send(s, buf, strlen(buf), 0) == SOCKET_ERROR ) {
|
|
|
+ debug("failed to send http request. errno=%d\n", socket_errno());
|
|
|
+ return -1;
|
|
|
+ }
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+const char *base64_table =
|
|
|
+"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
|
|
|
+
|
|
|
+char *
|
|
|
+make_base64_string(const char *str)
|
|
|
+{
|
|
|
+ static char *buf;
|
|
|
+ unsigned char *src;
|
|
|
+ char *dst;
|
|
|
+ int bits, data, src_len, dst_len;
|
|
|
+ /* make base64 string */
|
|
|
+ src_len = strlen(str);
|
|
|
+ dst_len = (src_len+2)/3*4;
|
|
|
+ buf = xmalloc(dst_len+1);
|
|
|
+ bits = data = 0;
|
|
|
+ src = (unsigned char *)str;
|
|
|
+ dst = (unsigned char *)buf;
|
|
|
+ while ( dst_len-- ) {
|
|
|
+ if ( bits < 6 ) {
|
|
|
+ data = (data << 8) | *src;
|
|
|
+ bits += 8;
|
|
|
+ if ( *src != 0 )
|
|
|
+ src++;
|
|
|
+ }
|
|
|
+ *dst++ = base64_table[0x3F & (data >> (bits-6))];
|
|
|
+ bits -= 6;
|
|
|
+ }
|
|
|
+ *dst = '\0';
|
|
|
+ /* fix-up tail padding */
|
|
|
+ switch ( src_len%3 ) {
|
|
|
+ case 1:
|
|
|
+ *--dst = '=';
|
|
|
+ case 2:
|
|
|
+ *--dst = '=';
|
|
|
+ }
|
|
|
+ return buf;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+int
|
|
|
+basic_auth (SOCKET s)
|
|
|
+{
|
|
|
+ char *userpass;
|
|
|
+ char *cred;
|
|
|
+ const char *user = relay_user;
|
|
|
+ char *pass = NULL;
|
|
|
+ int len, ret;
|
|
|
+
|
|
|
+ /* Get username/password for authentication */
|
|
|
+ if (user == NULL)
|
|
|
+ fatal("Cannot decide username for proxy authentication.");
|
|
|
+ if ((pass = determine_relay_password ()) == NULL &&
|
|
|
+ (pass = readpass("Enter proxy authentication password for %s@%s: ",
|
|
|
+ relay_user, relay_host)) == NULL)
|
|
|
+ fatal("Cannot decide password for proxy authentication.");
|
|
|
+
|
|
|
+ len = strlen(user)+strlen(pass)+1;
|
|
|
+ userpass = xmalloc(len+1);
|
|
|
+ snprintf(userpass, len+1, "%s:%s", user, pass);
|
|
|
+ memset (pass, 0, strlen(pass));
|
|
|
+ cred = make_base64_string(userpass);
|
|
|
+ memset (userpass, 0, len);
|
|
|
+
|
|
|
+ f_report = 0; /* don't report for security */
|
|
|
+ ret = sendf(s, "Proxy-Authorization: Basic %s\r\n", cred);
|
|
|
+ f_report = 1;
|
|
|
+ report_text(">>>", "Proxy-Authorization: Basic xxxxx\r\n");
|
|
|
+
|
|
|
+ memset(cred, 0, strlen(cred));
|
|
|
+ free(cred);
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+/* begin relaying via HTTP proxy
|
|
|
+ Directs CONNECT method to proxy server to connect to
|
|
|
+ destination host (and port). It may not be allowed on your
|
|
|
+ proxy server.
|
|
|
+ */
|
|
|
+int
|
|
|
+begin_http_relay( SOCKET s )
|
|
|
+{
|
|
|
+ char buf[1024];
|
|
|
+ int result;
|
|
|
+ char *auth_what;
|
|
|
+
|
|
|
+ debug("begin_http_relay()\n");
|
|
|
+
|
|
|
+ if (sendf(s,"CONNECT %s:%d HTTP/1.0\r\n", dest_host, dest_port) < 0)
|
|
|
+ return START_ERROR;
|
|
|
+ if (proxy_auth_type == PROXY_AUTH_BASIC && basic_auth (s) < 0)
|
|
|
+ return START_ERROR;
|
|
|
+ if (sendf(s,"\r\n") < 0)
|
|
|
+ return START_ERROR;
|
|
|
+
|
|
|
+ /* get response */
|
|
|
+ if ( line_input(s, buf, sizeof(buf)) < 0 ) {
|
|
|
+ debug("failed to read http response.\n");
|
|
|
+ return START_ERROR;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* check status */
|
|
|
+ if (!strchr(buf, ' ')) {
|
|
|
+ error ("Unexpected http response: '%s'.\n", buf);
|
|
|
+ return START_ERROR;
|
|
|
+ }
|
|
|
+ result = atoi(strchr(buf,' '));
|
|
|
+
|
|
|
+ switch ( result ) {
|
|
|
+ case 200:
|
|
|
+ /* Conguraturation, connected via http proxy server! */
|
|
|
+ debug("connected, start user session.\n");
|
|
|
+ break;
|
|
|
+ case 302: /* redirect */
|
|
|
+ do {
|
|
|
+ if (line_input(s, buf, sizeof(buf)))
|
|
|
+ break;
|
|
|
+ downcase(buf);
|
|
|
+ if (expect(buf, "Location: ")) {
|
|
|
+ relay_host = cut_token(buf, "//");
|
|
|
+ cut_token(buf, "/");
|
|
|
+ relay_port = atoi(cut_token(buf, ":"));
|
|
|
+ }
|
|
|
+ } while (strcmp(buf,"\r\n") != 0);
|
|
|
+ return START_RETRY;
|
|
|
+
|
|
|
+ /* We handle both 401 and 407 codes here: 401 is WWW-Authenticate, which
|
|
|
+ * not strictly the correct response, but some proxies do send this (e.g.
|
|
|
+ * Symantec's Raptor firewall) */
|
|
|
+ case 401: /* WWW-Auth required */
|
|
|
+ case 407: /* Proxy-Auth required */
|
|
|
+ /** NOTE: As easy implementation, we support only BASIC scheme
|
|
|
+ and ignore realm. */
|
|
|
+ /* If proxy_auth_type is PROXY_AUTH_BASIC and get
|
|
|
+ this result code, authentication was failed. */
|
|
|
+ if (proxy_auth_type != PROXY_AUTH_NONE) {
|
|
|
+ error("Authentication failed.\n");
|
|
|
+ return START_ERROR;
|
|
|
+ }
|
|
|
+ auth_what = (result == 401) ? "WWW-Authenticate:" : "Proxy-Authenticate:";
|
|
|
+ do {
|
|
|
+ if ( line_input(s, buf, sizeof(buf)) ) {
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ downcase(buf);
|
|
|
+ if (expect(buf, auth_what)) {
|
|
|
+ /* parse type and realm */
|
|
|
+ char *scheme, *realm;
|
|
|
+ scheme = cut_token(buf, " ");
|
|
|
+ realm = cut_token(scheme, " ");
|
|
|
+ if ( scheme == NULL || realm == NULL ) {
|
|
|
+ debug("Invalid format of %s field.", auth_what);
|
|
|
+ return START_ERROR; /* fail */
|
|
|
+ }
|
|
|
+ /* check supported auth type */
|
|
|
+ if (expect(scheme, "basic")) {
|
|
|
+ proxy_auth_type = PROXY_AUTH_BASIC;
|
|
|
+ } else {
|
|
|
+ debug("Unsupported authentication type: %s", scheme);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ } while (strcmp(buf,"\r\n") != 0);
|
|
|
+ if ( proxy_auth_type == PROXY_AUTH_NONE ) {
|
|
|
+ debug("Can't find %s in response header.", auth_what);
|
|
|
+ return START_ERROR;
|
|
|
+ } else {
|
|
|
+ return START_RETRY;
|
|
|
+ }
|
|
|
+
|
|
|
+ default:
|
|
|
+ /* Not allowed */
|
|
|
+ debug("http proxy is not allowed.\n");
|
|
|
+ return START_ERROR;
|
|
|
+ }
|
|
|
+ /* skip to end of response header */
|
|
|
+ do {
|
|
|
+ if ( line_input(s, buf, sizeof(buf) ) ) {
|
|
|
+ debug("Can't skip response headers\n");
|
|
|
+ return START_ERROR;
|
|
|
+ }
|
|
|
+ } while ( strcmp(buf,"\r\n") != 0 );
|
|
|
+
|
|
|
+ return START_OK;
|
|
|
+}
|
|
|
+
|
|
|
+/* begin relaying via TELNET proxy.
|
|
|
+ Sends string specified by telnet_command (-c option) with
|
|
|
+ replacing host name and port number to the socket. */
|
|
|
+int
|
|
|
+begin_telnet_relay( SOCKET s )
|
|
|
+{
|
|
|
+ char buf[1024];
|
|
|
+ char *cmd;
|
|
|
+ char *good_phrase = "connected to";
|
|
|
+ char *bad_phrase_list[] = {
|
|
|
+ " failed", " refused", " rejected", " closed"
|
|
|
+ };
|
|
|
+ char sep = ' ';
|
|
|
+ int i;
|
|
|
+
|
|
|
+ debug("begin_telnet_relay()\n");
|
|
|
+
|
|
|
+ /* report phrase */
|
|
|
+ debug("good phrase: '%s'\n", good_phrase);
|
|
|
+ debug("bad phrases");
|
|
|
+ sep = ':';
|
|
|
+ for (i=0; i< (sizeof(bad_phrase_list) / sizeof(char*)); i++) {
|
|
|
+ debug_("%c '%s'", sep, bad_phrase_list[i]);
|
|
|
+ sep = ',';
|
|
|
+ }
|
|
|
+ debug_("\n");
|
|
|
+
|
|
|
+ /* make request string with replacing %h by destination hostname
|
|
|
+ and %p by port number, etc. */
|
|
|
+ cmd = expand_host_and_port(telnet_command, dest_host, dest_port);
|
|
|
+
|
|
|
+ /* Sorry, we send request string now without waiting a prompt. */
|
|
|
+ if (sendf(s, "%s\r\n", cmd) < 0) {
|
|
|
+ free(cmd);
|
|
|
+ return START_ERROR;
|
|
|
+ }
|
|
|
+ free(cmd);
|
|
|
+
|
|
|
+ /* Process answer from proxy until good or bad phrase is detected. We
|
|
|
+ assume that the good phrase should be appeared only in the final
|
|
|
+ line of proxy responses. Bad keywods in the line causes operation
|
|
|
+ fail. First checks a good phrase, then checks bad phrases.
|
|
|
+ If no match, continue reading line from proxy. */
|
|
|
+ while (!line_input(s, buf, sizeof(buf)) && buf[0] != '\0') {
|
|
|
+ downcase(buf);
|
|
|
+ /* first, check good phrase */
|
|
|
+ if (strstr(buf, good_phrase)) {
|
|
|
+ debug("good phrase is detected: '%s'\n", good_phrase);
|
|
|
+ return START_OK;
|
|
|
+ }
|
|
|
+ /* then, check bad phrase */
|
|
|
+ for (i=0; i<(sizeof(bad_phrase_list)/sizeof(char*)); i++) {
|
|
|
+ if (strstr(buf, bad_phrase_list[i]) != NULL) {
|
|
|
+ debug("bad phrase is detected: '%s'\n", bad_phrase_list[i]);
|
|
|
+ return START_ERROR;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ debug("error reading from telnet proxy\n");
|
|
|
+
|
|
|
+ return START_ERROR;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+#ifdef _WIN32
|
|
|
+/* ddatalen()
|
|
|
+ Returns 1 if data is available, otherwise return 0
|
|
|
+ */
|
|
|
+int
|
|
|
+stdindatalen (void)
|
|
|
+{
|
|
|
+ DWORD len = 0;
|
|
|
+ struct stat st;
|
|
|
+ fstat( 0, &st );
|
|
|
+ if ( st.st_mode & _S_IFIFO ) {
|
|
|
+ /* in case of PIPE */
|
|
|
+ if ( !PeekNamedPipe( GetStdHandle(STD_INPUT_HANDLE),
|
|
|
+ NULL, 0, NULL, &len, NULL) ) {
|
|
|
+ if ( GetLastError() == ERROR_BROKEN_PIPE ) {
|
|
|
+ /* PIPE source is closed */
|
|
|
+ /* read() will detects EOF */
|
|
|
+ len = 1;
|
|
|
+ } else {
|
|
|
+ fatal("PeekNamedPipe() failed, errno=%d\n",
|
|
|
+ GetLastError());
|
|
|
+ }
|
|
|
+ }
|
|
|
+ } else if ( st.st_mode & _S_IFREG ) {
|
|
|
+ /* in case of regular file (redirected) */
|
|
|
+ len = 1; /* always data ready */
|
|
|
+ } else if ( _kbhit() ) {
|
|
|
+ /* in case of console */
|
|
|
+ len = 1;
|
|
|
+ }
|
|
|
+ return len;
|
|
|
+}
|
|
|
+#endif /* _WIN32 */
|
|
|
+
|
|
|
+/* relay byte from stdin to socket and fro socket to stdout.
|
|
|
+ returns reason of termination */
|
|
|
+int
|
|
|
+do_repeater( SOCKET local_in, SOCKET local_out, SOCKET remote )
|
|
|
+{
|
|
|
+ /** vars for local input data **/
|
|
|
+ char lbuf[1024]; /* local input buffer */
|
|
|
+ int lbuf_len; /* available data in lbuf */
|
|
|
+ int f_local; /* read local input more? */
|
|
|
+ /** vars for remote input data **/
|
|
|
+ char rbuf[1024]; /* remote input buffer */
|
|
|
+ int rbuf_len; /* available data in rbuf */
|
|
|
+ int f_remote; /* read remote input more? */
|
|
|
+ int close_reason = REASON_UNK; /* reason of end repeating */
|
|
|
+ /** other variables **/
|
|
|
+ int nfds, len;
|
|
|
+ fd_set ifds, ofds;
|
|
|
+ struct timeval *tmo;
|
|
|
+#ifdef _WIN32
|
|
|
+ struct timeval win32_tmo;
|
|
|
+#endif /* _WIN32 */
|
|
|
+
|
|
|
+ /* repeater between stdin/out and socket */
|
|
|
+ nfds = ((local_in<remote)? remote: local_in) +1;
|
|
|
+ f_local = 1; /* yes, read from local */
|
|
|
+ f_remote = 1; /* yes, read from remote */
|
|
|
+ lbuf_len = 0;
|
|
|
+ rbuf_len = 0;
|
|
|
+
|
|
|
+ while ( f_local || f_remote ) {
|
|
|
+ FD_ZERO(&ifds );
|
|
|
+ FD_ZERO(&ofds );
|
|
|
+ tmo = NULL;
|
|
|
+
|
|
|
+ /** prepare for reading local input **/
|
|
|
+ if ( f_local && (lbuf_len < (int)sizeof(lbuf)) ) {
|
|
|
+#ifdef _WIN32
|
|
|
+ if ( local_type != LOCAL_SOCKET ) {
|
|
|
+ /* select() on Winsock is not accept standard handle.
|
|
|
+ So use select() with short timeout and checking data
|
|
|
+ in stdin by another method. */
|
|
|
+ win32_tmo.tv_sec = 0;
|
|
|
+ win32_tmo.tv_usec = 10*1000; /* 10 ms */
|
|
|
+ tmo = &win32_tmo;
|
|
|
+ } else
|
|
|
+#endif /* !_WIN32 */
|
|
|
+ FD_SET( local_in, &ifds );
|
|
|
+ }
|
|
|
+
|
|
|
+ /** prepare for reading remote input **/
|
|
|
+ if ( f_remote && (rbuf_len < (int)sizeof(rbuf)) ) {
|
|
|
+ FD_SET( remote, &ifds );
|
|
|
+ }
|
|
|
+
|
|
|
+ /* FD_SET( local_out, ofds ); */
|
|
|
+ /* FD_SET( remote, ofds ); */
|
|
|
+
|
|
|
+ if ( select( nfds, &ifds, &ofds, (fd_set*)NULL, tmo ) == -1 ) {
|
|
|
+ /* some error */
|
|
|
+ error( "select() failed, %d\n", socket_errno());
|
|
|
+ return REASON_ERROR;
|
|
|
+ }
|
|
|
+#ifdef _WIN32
|
|
|
+ /* fake ifds if local is stdio handle because
|
|
|
+ select() of Winsock does not accept stdio
|
|
|
+ handle. */
|
|
|
+ if (f_local && (local_type!=LOCAL_SOCKET) && (0<stdindatalen()))
|
|
|
+ FD_SET(0,&ifds); /* data ready */
|
|
|
+#endif
|
|
|
+
|
|
|
+ /* remote => local */
|
|
|
+ if ( FD_ISSET(remote, &ifds) && (rbuf_len < (int)sizeof(rbuf)) ) {
|
|
|
+ len = recv( remote, rbuf + rbuf_len, sizeof(rbuf)-rbuf_len, 0);
|
|
|
+ if ( len == 0 || (len == -1 && socket_errno() == ECONNRESET)) {
|
|
|
+ debug("connection %s by peer\n",
|
|
|
+ (len==0)? "closed": "reset");
|
|
|
+ close_reason = REASON_CLOSED_BY_REMOTE;
|
|
|
+ f_remote = 0; /* no more read from socket */
|
|
|
+ f_local = 0;
|
|
|
+ } else if ( len == -1 ) {
|
|
|
+ /* error */
|
|
|
+ fatal("recv() failed, %d\n", socket_errno());
|
|
|
+ } else {
|
|
|
+ debug("recv %d bytes\n", len);
|
|
|
+ if ( 1 < f_debug ) /* more verbose */
|
|
|
+ report_bytes( "<<<", rbuf+rbuf_len, len);
|
|
|
+ rbuf_len += len;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /* local => remote */
|
|
|
+ if ( FD_ISSET(local_in, &ifds) && (lbuf_len < (int)sizeof(lbuf)) ) {
|
|
|
+ if (local_type == LOCAL_SOCKET)
|
|
|
+ len = recv(local_in, lbuf + lbuf_len,
|
|
|
+ sizeof(lbuf)-lbuf_len, 0);
|
|
|
+ else
|
|
|
+ len = read(local_in, lbuf + lbuf_len, sizeof(lbuf)-lbuf_len);
|
|
|
+ if ( len == 0 ) {
|
|
|
+ /* stdin is EOF */
|
|
|
+ debug("local input is EOF\n");
|
|
|
+ if (!f_hold_session)
|
|
|
+ shutdown(remote, 1); /* no-more writing */
|
|
|
+ f_local = 0;
|
|
|
+ close_reason = REASON_CLOSED_BY_LOCAL;
|
|
|
+ } else if ( len == -1 ) {
|
|
|
+ /* error on reading from stdin */
|
|
|
+ if (f_hold_session) {
|
|
|
+ debug ("failed to read from local\n");
|
|
|
+ f_local = 0;
|
|
|
+ close_reason = REASON_CLOSED_BY_LOCAL;
|
|
|
+ } else
|
|
|
+ fatal("recv() failed, errno = %d\n", errno);
|
|
|
+ } else {
|
|
|
+ /* repeat */
|
|
|
+ lbuf_len += len;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /* flush data in buffer to socket */
|
|
|
+ if ( 0 < lbuf_len ) {
|
|
|
+ len = send(remote, lbuf, lbuf_len, 0);
|
|
|
+ if ( len == -1 ) {
|
|
|
+ fatal("send() failed, %d\n", socket_errno());
|
|
|
+ } else if ( 0 < len ) {
|
|
|
+ if ( 1 < f_debug ) /* more verbose */
|
|
|
+ report_bytes( ">>>", lbuf, len);
|
|
|
+ /* move data on to top of buffer */
|
|
|
+ debug("sent %d bytes\n", len);
|
|
|
+ lbuf_len -= len;
|
|
|
+ if ( 0 < lbuf_len )
|
|
|
+ memcpy( lbuf, lbuf+len, lbuf_len );
|
|
|
+ assert( 0 <= lbuf_len );
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /* flush data in buffer to local output */
|
|
|
+ if ( 0 < rbuf_len ) {
|
|
|
+ if (local_type == LOCAL_SOCKET)
|
|
|
+ len = send( local_out, rbuf, rbuf_len, 0);
|
|
|
+ else
|
|
|
+ len = write( local_out, rbuf, rbuf_len);
|
|
|
+ if ( len == -1 ) {
|
|
|
+ fatal("output (local) failed, errno=%d\n", errno);
|
|
|
+ }
|
|
|
+ rbuf_len -= len;
|
|
|
+ if ( len < rbuf_len )
|
|
|
+ memcpy( rbuf, rbuf+len, rbuf_len );
|
|
|
+ assert( 0 <= rbuf_len );
|
|
|
+ }
|
|
|
+ if (f_local == 0 && f_hold_session) {
|
|
|
+ debug ("closing local port without disconnecting from remote\n");
|
|
|
+ f_remote = 0;
|
|
|
+ shutdown (local_out, 2);
|
|
|
+ close (local_out);
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return close_reason;
|
|
|
+}
|
|
|
+
|
|
|
+int
|
|
|
+accept_connection (u_short port)
|
|
|
+{
|
|
|
+ static int sock = -1;
|
|
|
+ int connection;
|
|
|
+ struct sockaddr_in name;
|
|
|
+ struct sockaddr client;
|
|
|
+ int socklen;
|
|
|
+ fd_set ifds;
|
|
|
+ int nfds;
|
|
|
+ int sockopt;
|
|
|
+
|
|
|
+ /* Create the socket. */
|
|
|
+ debug("Creating source port to forward.\n");
|
|
|
+ sock = socket (PF_INET, SOCK_STREAM, 0);
|
|
|
+ if (sock < 0)
|
|
|
+ fatal("socket() failed, errno=%d\n", socket_errno());
|
|
|
+ sockopt = 1;
|
|
|
+ setsockopt (sock, SOL_SOCKET, SO_REUSEADDR,
|
|
|
+ (void*)&sockopt, sizeof(sockopt));
|
|
|
+
|
|
|
+ /* Give the socket a name. */
|
|
|
+ name.sin_family = AF_INET;
|
|
|
+ name.sin_port = htons (port);
|
|
|
+ name.sin_addr.s_addr = htonl (INADDR_ANY);
|
|
|
+ if (bind (sock, (struct sockaddr *) &name, sizeof (name)) < 0)
|
|
|
+ fatal ("bind() failed, errno=%d\n", socket_errno());
|
|
|
+
|
|
|
+ if (listen( sock, 1) < 0)
|
|
|
+ fatal ("listen() failed, errno=%d\n", socket_errno());
|
|
|
+
|
|
|
+ /* wait for new connection with watching EOF of stdin. */
|
|
|
+ debug ("waiting new connection at port %d (socket=%d)\n", port, sock);
|
|
|
+ nfds = sock + 1;
|
|
|
+ do {
|
|
|
+ int n;
|
|
|
+ struct timeval *ptmo = NULL;
|
|
|
+#ifdef _WIN32
|
|
|
+ struct timeval tmo;
|
|
|
+ tmo.tv_sec = 0;
|
|
|
+ tmo.tv_usec = 100*1000; /* On Windows, 100ms timeout */
|
|
|
+ ptmo = &tmo;
|
|
|
+#endif /* _WIN32 */
|
|
|
+ FD_ZERO (&ifds);
|
|
|
+ FD_SET ((SOCKET)sock, &ifds);
|
|
|
+#ifndef _WIN32
|
|
|
+ FD_SET (0, &ifds); /* watch stdin */
|
|
|
+#endif
|
|
|
+ n = select (nfds, &ifds, NULL, NULL, ptmo);
|
|
|
+ if (n == -1) {
|
|
|
+ fatal ("select() failed, %d\n", socket_errno());
|
|
|
+ exit (1);
|
|
|
+ }
|
|
|
+#ifdef _WIN32
|
|
|
+ if (0 < stdindatalen()) {
|
|
|
+ FD_SET (0, &ifds); /* fake */
|
|
|
+ n++;
|
|
|
+ }
|
|
|
+#endif
|
|
|
+ if (0 < n) {
|
|
|
+ if (FD_ISSET(0, &ifds) && (getchar() <= 0)) {
|
|
|
+ /* EOF */
|
|
|
+ debug ("Give-up waiting port because stdin is closed.");
|
|
|
+ exit(0);
|
|
|
+ }
|
|
|
+ if (FD_ISSET(sock, &ifds))
|
|
|
+ break; /* socket is stimulated */
|
|
|
+ }
|
|
|
+ } while (1);
|
|
|
+ socklen = sizeof(client);
|
|
|
+ connection = accept( sock, &client, &socklen);
|
|
|
+ if ( connection < 0 )
|
|
|
+ fatal ("accept() failed, errno=%d\n", socket_errno());
|
|
|
+ return connection;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+
|
|
|
+/** Main of program **/
|
|
|
+int
|
|
|
+main( int argc, char **argv )
|
|
|
+{
|
|
|
+ int ret;
|
|
|
+ int remote; /* socket */
|
|
|
+ int local_in; /* Local input */
|
|
|
+ int local_out; /* Local output */
|
|
|
+ int reason;
|
|
|
+#ifdef _WIN32
|
|
|
+ WSADATA wsadata;
|
|
|
+ WSAStartup( 0x101, &wsadata);
|
|
|
+#endif /* _WIN32 */
|
|
|
+
|
|
|
+ /* initialization */
|
|
|
+ make_revstr();
|
|
|
+ getarg( argc, argv );
|
|
|
+ debug("Program is $Revision: 100 $\n");
|
|
|
+
|
|
|
+ /* Open local_in and local_out if forwarding a port */
|
|
|
+ if ( local_type == LOCAL_SOCKET ) {
|
|
|
+ /* Relay between local port and destination */
|
|
|
+ local_in = local_out = accept_connection( local_port );
|
|
|
+ } else {
|
|
|
+ /* Relay between stdin/stdout and desteination */
|
|
|
+ local_in = 0;
|
|
|
+ local_out = 1;
|
|
|
+#ifdef _WIN32
|
|
|
+ _setmode(local_in, O_BINARY);
|
|
|
+ _setmode(local_out, O_BINARY);
|
|
|
+#endif
|
|
|
+ }
|
|
|
+
|
|
|
+retry:
|
|
|
+#ifndef _WIN32
|
|
|
+ if (0 < connect_timeout)
|
|
|
+ set_timeout (connect_timeout);
|
|
|
+#endif /* not _WIN32 */
|
|
|
+
|
|
|
+ if (check_direct(dest_host))
|
|
|
+ relay_method = METHOD_DIRECT;
|
|
|
+ /* make connection */
|
|
|
+ if ( relay_method == METHOD_DIRECT ) {
|
|
|
+ remote = open_connection (dest_host, dest_port);
|
|
|
+ if ( remote == SOCKET_ERROR )
|
|
|
+ fatal( "Unable to connect to destination host, errno=%d\n",
|
|
|
+ socket_errno());
|
|
|
+ } else {
|
|
|
+ remote = open_connection (relay_host, relay_port);
|
|
|
+ if ( remote == SOCKET_ERROR )
|
|
|
+ fatal( "Unable to connect to relay host, errno=%d\n",
|
|
|
+ socket_errno());
|
|
|
+ }
|
|
|
+
|
|
|
+ /** resolve destination host (SOCKS) **/
|
|
|
+#if !defined(_WIN32) && !defined(__CYGWIN32__)
|
|
|
+ if (socks_ns.sin_addr.s_addr != 0)
|
|
|
+ switch_ns (&socks_ns);
|
|
|
+#endif /* not _WIN32 && not __CYGWIN32__ */
|
|
|
+ if (relay_method == METHOD_SOCKS &&
|
|
|
+ socks_resolve == RESOLVE_LOCAL &&
|
|
|
+ local_resolve (dest_host, &dest_addr) < 0) {
|
|
|
+ fatal("Unknown host: %s", dest_host);
|
|
|
+ }
|
|
|
+
|
|
|
+ /** relay negociation **/
|
|
|
+ switch ( relay_method ) {
|
|
|
+ case METHOD_SOCKS:
|
|
|
+ if ( ((socks_version == 5) && (begin_socks5_relay(remote) < 0)) ||
|
|
|
+ ((socks_version == 4) && (begin_socks4_relay(remote) < 0)) )
|
|
|
+ fatal( "failed to begin relaying via SOCKS.\n");
|
|
|
+ break;
|
|
|
+
|
|
|
+ case METHOD_HTTP:
|
|
|
+ ret = begin_http_relay(remote);
|
|
|
+ switch (ret) {
|
|
|
+ case START_ERROR:
|
|
|
+ close (remote);
|
|
|
+ fatal("failed to begin relaying via HTTP.\n");
|
|
|
+ case START_OK:
|
|
|
+ break;
|
|
|
+ case START_RETRY:
|
|
|
+ /* retry with authentication */
|
|
|
+ close (remote);
|
|
|
+ goto retry;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case METHOD_TELNET:
|
|
|
+ if (begin_telnet_relay(remote) < 0)
|
|
|
+ fatal("failed to begin relaying via telnet.\n");
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ debug("connected\n");
|
|
|
+
|
|
|
+#ifndef _WIN32
|
|
|
+ if (0 < connect_timeout)
|
|
|
+ set_timeout (0);
|
|
|
+#endif /* not _WIN32 */
|
|
|
+
|
|
|
+ /* main loop */
|
|
|
+ debug ("start relaying.\n");
|
|
|
+do_repeater:
|
|
|
+ reason = do_repeater(local_in, local_out, remote);
|
|
|
+ debug ("relaying done.\n");
|
|
|
+ if (local_type == LOCAL_SOCKET &&
|
|
|
+ reason == REASON_CLOSED_BY_LOCAL &&
|
|
|
+ f_hold_session) {
|
|
|
+ /* re-wait at local port without closing remote session */
|
|
|
+ debug ("re-waiting at local port %d\n", local_port);
|
|
|
+ local_in = local_out = accept_connection( local_port );
|
|
|
+ debug ("re-start relaying\n");
|
|
|
+ goto do_repeater;
|
|
|
+ }
|
|
|
+ closesocket(remote);
|
|
|
+ if ( local_type == LOCAL_SOCKET)
|
|
|
+ closesocket(local_in);
|
|
|
+#ifdef _WIN32
|
|
|
+ WSACleanup();
|
|
|
+#endif /* _WIN32 */
|
|
|
+ debug ("that's all, bye.\n");
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/* ------------------------------------------------------------
|
|
|
+ Local Variables:
|
|
|
+ compile-command: "cc connect.c -o connect"
|
|
|
+ tab-width: 8
|
|
|
+ fill-column: 74
|
|
|
+ comment-column: 48
|
|
|
+ End:
|
|
|
+ ------------------------------------------------------------ */
|
|
|
+
|
|
|
+/*** end of connect.c ***/
|
Richard Purdie