From: Marco Zanon Date: Sun, 26 Aug 2012 13:43:18 +0000 (+0000) Subject: Created 1.x/ trunk subdirectory. X-Git-Tag: SVN-to-Git~1 X-Git-Url: https://gitweb.marcozanon.com/?a=commitdiff_plain;h=4ead1b65ead1db30c598e2becb29f2c6d3f92c85;p=mz_ultravnc_repeater Created 1.x/ trunk subdirectory. --- diff --git a/1.x/LICENSE b/1.x/LICENSE new file mode 100644 index 0000000..d159169 --- /dev/null +++ b/1.x/LICENSE @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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If this is what you want to do, use the GNU Lesser General +Public License instead of this License. diff --git a/1.x/mz_ultravnc_repeater.pl b/1.x/mz_ultravnc_repeater.pl new file mode 100755 index 0000000..4997d9f --- /dev/null +++ b/1.x/mz_ultravnc_repeater.pl @@ -0,0 +1,975 @@ +#!/usr/bin/env perl +# +# Copyright (c) 2012 by Marco Zanon +# +# Mostly based on ultravnc_repeater.pl +# Copyright (c) 2009-2012 by Karl J. Runge +# +# mz_ultravnc_repeater.pl is free software; you can redistribute it and/or +# modify it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or (at +# your option) any later version. +# +# mz_ultravnc_repeater.pl is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with mz_ultravnc_repeater.pl; if not, write to the Free Software +# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA +# or see . +# + +my $usage = ' +mz_ultravnc_repeater.pl: + perl script implementing the ultravnc repeater + proxy protocol. + +protocol: Listen on one port for vnc clients (default 5900.) + Listen on one port for vnc servers (default 5500.) + Read 250 bytes from connecting vnc client or server. + Accept ID: from clients and servers, connect them + together once both are present. + + The string "RFB 000.000\n" is sent to the client (the client + must understand this means send ID:... or host:port.) + + Also accept : from clients and make the + connection to the vnc server immediately. + + Note it is up to the client whether to encrypt the subsequent VNC + session, etc. + +Usage: mz_ultravnc_repeater.pl [options] [client_port [server_port]] + +Options: + +Use -r to refuse new server/client connections when there is an existing +server/client ID. The default is to close the previous one. (Same as +setting the ULTRAVNC_REPEATER_REFUSE env. var.) + +Use -l to set the logfile (or set the ULTRAVNC_REPEATER_LOGFILE env. var.) +E.g. "-l /var/log/repeater.log" + +To run an outer loop restarting the server if it exits use "-L" or "-L BG" +(which are the same as setting the env. var. ULTRAVNC_REPEATER_LOOP=1 +or ULTRAVNC_REPEATER_LOOP=BG) The -L BG mode forks into the background. + +Use -p to set a file to store the master pid in for your own tracking +(same as ULTRAVNC_REPEATER_PIDFILE). For example, a cronjob may supply +a -p pidfile and check if the process id stored in the file is still +running before deciding to run this script. + +Use -i to add a single ID to the list of valid ones (same as setting all +valid IDs into ULTRAVNC_REPEATER_VALIDIDS). Note that if you don\'t use +this option, every ID will be considered valid. + +Use -C or set ULTRAVNC_REPEATER_CLEAN=1 to have the script periodically +check for and close initial connections that have gone away before the +partner connects (currently only works on Linux.) + +Use -R or set ULTRAVNC_REPEATER_NO_RFB=1 to disable sending "RFB 000.000" +to the client. Then this program acts as general TCP rendezvous tool. + +Set the env. var. ULTRAVNC_REPEATER_BUFSIZE to something other than 250 +bytes to modify the ultravnc proxy handshake buffer size for your own +special application. + +You can also set client_port via -c and server_port via -s. + +Examples: + + mz_ultravnc_repeater.pl + mz_ultravnc_repeater.pl -r + mz_ultravnc_repeater.pl -i 123456 -i 234567 + mz_ultravnc_repeater.pl 5901 + mz_ultravnc_repeater.pl 5901 5501 + + env ULTRAVNC_REPEATER_LOOP=BG ULTRAVNC_REPEATER_LOGFILE=/tmp/u.log mz_ultravnc_repeater.pl ... + mz_ultravnc_repeater.pl -L BG -l /tmp/u.log ... + +Any ULTRAVNC_REPEATER_* environment variables may also be set as the initial +arguments on the command line. + +This program can also be launched via web server CGI. Please see the +subroutine check_cgi() in the script for informtion about the query +names and security issues. + +'; + +use strict; + +if (@ARGV && $ARGV[0] =~ /-h/) { + print $usage; + exit 0; +} + +if ($ENV{ULTRAVNC_REPEATER_DEBUG}) { + print STDERR "pwd: ", `pwd`; + print STDERR "zero: $0\n"; + print STDERR "ls: ", `ls -l $0`; + print STDERR "perl: ", `sh -c 'type perl'`; +} + +check_cgi(); + +my $client_port0 = 5900; +my $server_port0 = 5500; + +while (@ARGV) { + if ($ARGV[0] =~ /^-*(ULTRAVNC_REPEATER_\w+)=(.+)/) { + $ENV{$1} = $2; + shift; + } elsif ($ARGV[0] eq '-l') { + shift; + $ENV{ULTRAVNC_REPEATER_LOGFILE} = shift; + } elsif ($ARGV[0] eq '-p') { + shift; + $ENV{ULTRAVNC_REPEATER_PIDFILE} = shift; + } elsif ($ARGV[0] eq '-c') { + shift; + $ENV{ULTRAVNC_REPEATER_CLIENT_PORT} = shift; + } elsif ($ARGV[0] eq '-s') { + shift; + $ENV{ULTRAVNC_REPEATER_SERVER_PORT} = shift; + } elsif ($ARGV[0] eq '-L') { + shift; + if (@ARGV && $ARGV[0] =~ /^(1|0|BG)$/) { + $ENV{ULTRAVNC_REPEATER_LOOP} = shift; + } else { + $ENV{ULTRAVNC_REPEATER_LOOP} = '1'; + } + } elsif ($ARGV[0] eq '-R') { + shift; + if (@ARGV && $ARGV[0] =~ /^(1|0)$/) { + $ENV{ULTRAVNC_REPEATER_NO_RFB} = shift; + } else { + $ENV{ULTRAVNC_REPEATER_NO_RFB} = '1'; + } + } elsif ($ARGV[0] eq '-C') { + shift; + if (@ARGV && $ARGV[0] =~ /^(1|0)$/) { + $ENV{ULTRAVNC_REPEATER_CLEAN} = shift; + } else { + $ENV{ULTRAVNC_REPEATER_CLEAN} = '1'; + } + } elsif ($ARGV[0] eq '-r') { + shift; + if (@ARGV && $ARGV[0] =~ /^(1|0)$/) { + $ENV{ULTRAVNC_REPEATER_REFUSE} = shift; + } else { + $ENV{ULTRAVNC_REPEATER_REFUSE} = '1'; + } + } elsif ($ARGV[0] eq '-i') { + shift; + $ENV{ULTRAVNC_REPEATER_VALIDIDS} = $ENV{ULTRAVNC_REPEATER_VALIDIDS} . " " . shift; + } else { + last; + } +} + +# Set up valid IDs array +# +my @valid_ids = (); +if (length($ENV{ULTRAVNC_REPEATER_VALIDIDS}) > 0) { + # remove initial space + $ENV{ULTRAVNC_REPEATER_VALIDIDS} = substr $ENV{ULTRAVNC_REPEATER_VALIDIDS}, 1; + # split string + @valid_ids = split(/ /, $ENV{ULTRAVNC_REPEATER_VALIDIDS}); +} + +# Set up logging: +# +if (exists $ENV{ULTRAVNC_REPEATER_LOGFILE}) { + close STDOUT; + if (!open(STDOUT, ">>$ENV{ULTRAVNC_REPEATER_LOGFILE}")) { + die "mz_ultravnc_repeater.pl: $ENV{ULTRAVNC_REPEATER_LOGFILE} $!\n"; + } + close STDERR; + open(STDERR, ">&STDOUT"); +} +select(STDERR); $| = 1; +select(STDOUT); $| = 1; + +# interrupt handler: +# +my $looppid = ''; +my $pidfile = ''; +# +sub get_out { + lprint("$_[0]:\t$$ looppid=$looppid"); + if ($looppid) { + kill 'TERM', $looppid; + fsleep(0.2); + } + unlink $pidfile if $pidfile; + cleanup(); + exit 0; +} + +# logging printer: +# +sub lprint { + print STDERR scalar(localtime), ": ", @_, "\n"; +} + +# These are overridden in actual server thread: +# +$SIG{INT} = \&get_out; +$SIG{TERM} = \&get_out; + +# pidfile: +# +sub open_pidfile { + if (exists $ENV{ULTRAVNC_REPEATER_PIDFILE}) { + my $pf = $ENV{ULTRAVNC_REPEATER_PIDFILE}; + if (open(PID, ">$pf")) { + print PID "$$\n"; + close PID; + $pidfile = $pf; + } else { + lprint("could not open pidfile: $pf - $! - continuing..."); + } + delete $ENV{ULTRAVNC_REPEATER_PIDFILE}; + } +} + +#################################################################### +# Set ULTRAVNC_REPEATER_LOOP=1 to have this script create an outer loop +# restarting itself if it ever exits. Set ULTRAVNC_REPEATER_LOOP=BG to +# do this in the background as a daemon. Same as -L option. + +if (exists $ENV{ULTRAVNC_REPEATER_LOOP}) { + my $csl = $ENV{ULTRAVNC_REPEATER_LOOP}; + if ($csl ne 'BG' && $csl ne '1') { + die "mz_ultravnc_repeater.pl: invalid ULTRAVNC_REPEATER_LOOP.\n"; + } + if ($csl eq 'BG') { + # go into bg as "daemon": + setpgrp(0, 0); + my $pid = fork(); + if (! defined $pid) { + die "mz_ultravnc_repeater.pl: $!\n"; + } elsif ($pid) { + wait; + exit 0; + } + if (fork) { + exit 0; + } + setpgrp(0, 0); + close STDIN; + if (! $ENV{ULTRAVNC_REPEATER_LOGFILE}) { + close STDOUT; + close STDERR; + } + } + # delete it so children will not do the same thing: + delete $ENV{ULTRAVNC_REPEATER_LOOP}; + + if (exists $ENV{ULTRAVNC_REPEATER_PIDFILE}) { + open_pidfile(); + } + + lprint("mz_ultravnc_repeater.pl: starting service. master-pid=$$"); + while (1) { + $looppid = fork; + if (! defined $looppid) { + sleep 10; + } elsif ($looppid) { + wait; + } else { + if ($ENV{ULTRAVNC_REPEATER_DEBUG}) { + print STDERR "exec $0 ", join(' ', @ARGV), "\n"; + } + exec $0, @ARGV; + exit 1; + } + lprint("mz_ultravnc_repeater.pl: re-starting service. master-pid=$$"); + sleep 1; + } + exit 0; +} +if (exists $ENV{ULTRAVNC_REPEATER_PIDFILE}) { + open_pidfile(); +} + +# End of background/daemon stuff. +#################################################################### + +use warnings; +use IO::Socket::INET; +use IO::Select; + +# Test for INET6 support: +# +my $have_inet6 = 0; +eval "use IO::Socket::INET6;"; +$have_inet6 = 1 if $@ eq ""; +print "perl module IO::Socket::INET6 not available: no IPv6 support.\n" if ! $have_inet6; + +my $prog = 'mz_ultravnc_repeater'; +my %ID; + +my $refuse = 0; +my $init_timeout = 5; + +my $select_timeout = 15; + +if (exists $ENV{ULTRAVNC_REPEATER_REFUSE} && $ENV{ULTRAVNC_REPEATER_REFUSE}) { + $refuse = 1; + lprint("enabling refuse mode (-r)."); +} + +my $client_port = shift; +my $server_port = shift; + +if (exists $ENV{ULTRAVNC_REPEATER_CLIENT_PORT}) { + $client_port0 = $ENV{ULTRAVNC_REPEATER_CLIENT_PORT}; +} +if (exists $ENV{ULTRAVNC_REPEATER_SERVER_PORT}) { + $server_port0 = $ENV{ULTRAVNC_REPEATER_SERVER_PORT}; +} + +$client_port = $client_port0 unless $client_port; +$server_port = $server_port0 unless $server_port; + +my $uname = `uname`; +chomp $uname; + +my $repeater_bufsize = 250; +$repeater_bufsize = $ENV{ULTRAVNC_REPEATER_BUFSIZE} if exists $ENV{ULTRAVNC_REPEATER_BUFSIZE}; + +my ($RIN, $WIN, $EIN, $ROUT); + +my $client_listen = IO::Socket::INET->new( + Listen => 10, + LocalPort => $client_port, + ReuseAddr => 1, + Proto => "tcp" +); +my $err1 = $!; +my $err2 = ''; +$client_listen = '' if ! $client_listen; + +my $client_listen6 = ''; +if ($have_inet6) { + eval {$client_listen6 = IO::Socket::INET6->new( + Listen => 10, + LocalPort => $client_port, + ReuseAddr => 1, + Domain => AF_INET6, + LocalAddr => "::", + Proto => "tcp" + );}; + $err2 = $!; +} +if (! $client_listen && ! $client_listen6) { + cleanup(); + die "$prog: error: client listen on port $client_port: $err1 - $err2\n"; +} + +my $server_listen = IO::Socket::INET->new( + Listen => 10, + LocalPort => $server_port, + ReuseAddr => 1, + Proto => "tcp" +); +$err1 = $!; +$err2 = ''; +$server_listen = '' if ! $server_listen; + +my $server_listen6 = ''; +if ($have_inet6) { + eval {$server_listen6 = IO::Socket::INET6->new( + Listen => 10, + LocalPort => $server_port, + ReuseAddr => 1, + Domain => AF_INET6, + LocalAddr => "::", + Proto => "tcp" + );}; + $err2 = $!; +} +if (! $server_listen && ! $server_listen6) { + cleanup(); + die "$prog: error: server listen on port $server_port: $err1 - $err2\n"; +} + +my $select = new IO::Select(); +if (! $select) { + cleanup(); + die "$prog: select $!\n"; +} + +$select->add($client_listen) if $client_listen; +$select->add($client_listen6) if $client_listen6; +$select->add($server_listen) if $server_listen; +$select->add($server_listen6) if $server_listen6; + +$SIG{INT} = sub {cleanup(); exit;}; +$SIG{TERM} = sub {cleanup(); exit;}; + +my $SOCK1 = ''; +my $SOCK2 = ''; +my $CURR = ''; + +lprint("$prog: starting up. pid: $$"); +lprint("watching for IPv4 connections on $client_port/client.") if $client_listen; +lprint("watching for IPv4 connections on $server_port/server.") if $server_listen; +lprint("watching for IPv6 connections on $client_port/client.") if $client_listen6; +lprint("watching for IPv6 connections on $server_port/server.") if $server_listen6; +lprint("valid IDs: @valid_ids.") if (@valid_ids); + +my $alarm_sock = ''; +my $got_alarm = 0; +sub alarm_handler { + lprint("$prog: got sig alarm."); + if ($alarm_sock ne '') { + close $alarm_sock; + } + $alarm_sock = ''; + $got_alarm = 1; +} + +while (1) { + my @ready = $select->can_read($select_timeout); + foreach my $fh (@ready) { + if (($client_listen && $fh == $client_listen) || ($client_listen6 && $fh == $client_listen6)) { + lprint("new vnc client connecting."); + } elsif (($server_listen && $fh == $server_listen) || ($server_listen6 && $fh == $server_listen6)) { + lprint("new vnc server connecting."); + } + my $sock = $fh->accept(); + if (! $sock) { + lprint("$prog: accept $!"); + next; + } + lprint("remote ip is ".$sock->peerhost()); + + if (($client_listen && $fh == $client_listen) || ($client_listen6 && $fh == $client_listen6)) { + if (exists $ENV{ULTRAVNC_REPEATER_NO_RFB} && $ENV{ULTRAVNC_REPEATER_NO_RFB}) { + lprint("ULTRAVNC_REPEATER_NO_RFB: not sending RFB 000.000"); + } else { + my $str = "RFB 000.000\n"; + my $len = length $str; + my $n = syswrite($sock, $str, $len, 0); + if ($n != $len) { + lprint("$prog: bad $str write: $n != $len $!"); + close $sock; + } + } + } + + my $buf = ''; + my $size = $repeater_bufsize; + $size = 1024 unless $size; + + $SIG{ALRM} = "alarm_handler"; + $alarm_sock = $sock; + $got_alarm = 0; + alarm($init_timeout); + my $n = sysread($sock, $buf, $size); + alarm(0); + + my $idx = index($buf, "\0"); + if ($idx >= 0) { + $buf = substr($buf, 0, $idx); + } + $buf =~ s/\s*$//; + + if ($got_alarm) { + lprint("$prog: read timed out: $!"); + } elsif (! defined $n) { + lprint("$prog: read error: $!"); + } elsif ($repeater_bufsize > 0 && $n != $size) { + lprint("$prog: short read $n != $size $!"); + close $sock; + } elsif (($client_listen && $fh == $client_listen) || ($client_listen6 && $fh == $client_listen6)) { + do_new_client($sock, $buf); + } elsif (($server_listen && $fh == $server_listen) || ($server_listen6 && $fh == $server_listen6)) { + do_new_server($sock, $buf); + } + } + clean_connections(); +} + +sub clean_connections { + if (exists $ENV{ULTRAVNC_REPEATER_CLEAN} && $ENV{ULTRAVNC_REPEATER_CLEAN}) { + foreach my $id (keys %ID) { + next if !exists $ID{$id}{sock}; + if (!established($ID{$id}{sock})) { + lprint("socket for ID:$id is no longer established, closing it."); + close $ID{$id}{sock}; + delete $ID{$id}; + } + } + } +} + +sub do_new_client { + my ($sock, $buf) = @_; + + if ($buf =~ /^ID:(\w+)/) { + my $id = $1; + + if (@valid_ids) { + my $is_valid_id = 0; + for (my $i = 0; $i < ($#valid_ids + 1); $i++) { + if ($id == $valid_ids[$i]) { + $is_valid_id = 1; + last; + } + } + if (!$is_valid_id) { + lprint("refusing vnc client: ID:$id not considered valid."); + close $sock; + return; + } + } + + if (exists $ID{$id} && exists $ID{$id}{client} && $ID{$id}{client} eq "0") { + if (!established($ID{$id}{sock})) { + lprint("server socket for ID:$id is no longer established, closing it."); + close $ID{$id}{sock}; + delete $ID{$id}; + } else { + lprint("server socket for ID:$id is still established."); + } + } + if (exists $ID{$id}) { + if ($ID{$id}{client}) { + my $ref = $refuse; + if ($ref && !established($ID{$id}{sock})) { + lprint("socket for ID:$id is no longer established, closing it."); + $ref = 0; + } + if ($ref) { + lprint("refusing extra vnc client for ID:$id."); + close $sock; + return; + } else { + lprint("closing and deleting previous vnc client with ID:$id."); + close $ID{$id}{sock}; + + lprint("storing new vnc client with ID:$id."); + $ID{$id}{client} = 1; + $ID{$id}{sock} = $sock; + } + } else { + lprint("hooking up new vnc client with existing vnc server for ID:$id."); + my $sock2 = $ID{$id}{sock}; + delete $ID{$id}; + hookup($sock, $sock2, "ID:$id"); + } + } else { + lprint("storing new vnc client with ID:$id."); + $ID{$id}{client} = 1; + $ID{$id}{sock} = $sock; + } + } else { + if (@valid_ids) { + lprint("refusing vnc client: ID requested."); + close $sock; + return; + } + + my $host = ''; + my $port = ''; + if ($buf =~ /^(.+):(-?\d+)/) { + $host = $1; + $port = $2; + } else { + $host = $buf; + $port = 5900; + } + if ($port < 0) { + my $pnew = -$port; + lprint("resetting port from $port to $pnew."); + $port = $pnew; + } elsif ($port < 200) { + my $pnew = $port + 5900; + lprint("resetting port from $port to $pnew."); + $port = $pnew; + } + lprint("making vnc client connection directly to vnc server host='$host' port='$port'."); + my $sock2 = IO::Socket::INET->new( + PeerAddr => $host, + PeerPort => $port, + Proto => "tcp" + ); + if (! $sock2 && $have_inet6) { + lprint("IPv4 connect error: $!, trying IPv6 ..."); + eval{$sock2 = IO::Socket::INET6->new( + PeerAddr => $host, + PeerPort => $port, + Proto => "tcp" + );}; + lprint("IPv6 connect error: $!") if !$sock2; + } else { + lprint("IPv4 connect error: $!") if !$sock2; + } + if (!$sock2) { + lprint("failed to connect to $host:$port."); + close $sock; + return; + } + hookup($sock, $sock2, "$host:$port"); + } +} + +sub do_new_server { + my ($sock, $buf) = @_; + + if ($buf =~ /^ID:(\w+)/) { + my $id = $1; + + if (@valid_ids) { + my $is_valid_id = 0; + for (my $i = 0; $i < ($#valid_ids + 1); $i++) { + if ($id == $valid_ids[$i]) { + $is_valid_id = 1; + last; + } + } + if (!$is_valid_id) { + lprint("refusing vnc server: ID:$id not considered valid."); + close $sock; + return; + } + } + + my $store = 1; + if (exists $ID{$id} && exists $ID{$id}{client} && $ID{$id}{client} eq "1") { + if (!established($ID{$id}{sock})) { + lprint("client socket for ID:$id is no longer established, closing it."); + close $ID{$id}{sock}; + delete $ID{$id}; + } else { + lprint("client socket for ID:$id is still established."); + } + } + if (exists $ID{$id}) { + if (! $ID{$id}{client}) { + my $ref = $refuse; + if ($ref && !established($ID{$id}{sock})) { + lprint("socket for ID:$id is no longer established, closing it."); + $ref = 0; + } + if ($ref) { + lprint("refusing extra vnc server for ID:$id."); + close $sock; + return; + } else { + lprint("closing and deleting previous vnc server with ID:$id."); + close $ID{$id}{sock}; + + lprint("storing new vnc server with ID:$id."); + $ID{$id}{client} = 0; + $ID{$id}{sock} = $sock; + } + } else { + lprint("hooking up new vnc server with existing vnc client for ID:$id."); + my $sock2 = $ID{$id}{sock}; + delete $ID{$id}; + hookup($sock, $sock2, "ID:$id"); + } + } else { + lprint("storing new vnc server with ID:$id."); + $ID{$id}{client} = 0; + $ID{$id}{sock} = $sock; + } + } else { + lprint("invalid ID:NNNNN string for vnc server: $buf"); + close $sock; + return; + } +} + +sub established { + my $fh = shift; + + return established_linux_proc($fh); + + # not working: + my $est = 1; + my $str = "Z"; + my $res; + #$res = recv($fh, $str, 1, MSG_PEEK | MSG_DONTWAIT); + if (defined($res)) { + lprint("established OK: $! '$str'."); + $est = 1; + } else { + # would check for EAGAIN here to decide ... + lprint("established err: $! '$str'."); + $est = 1; + } + return $est; +} + + +sub established_linux_proc { + # hack for Linux to see if remote side has gone away: + my $fh = shift; + + # if we can't figure things out, we must return true. + if ($uname !~ /Linux/) { + return 1; + } + + my @proc_net_tcp = (); + if (-e "/proc/net/tcp") { + push @proc_net_tcp, "/proc/net/tcp"; + } + if (-e "/proc/net/tcp6") { + push @proc_net_tcp, "/proc/net/tcp6"; + } + if (! @proc_net_tcp) { + return 1; + } + + my $n = fileno($fh); + if (!defined($n)) { + return 1; + } + + my $proc_fd = "/proc/$$/fd/$n"; + if (! -e $proc_fd) { + return 1; + } + + my $val = readlink($proc_fd); + if (! defined $val || $val !~ /socket:\[(\d+)\]/) { + return 1; + } + my $num = $1; + + my $st = ''; + + foreach my $tcp (@proc_net_tcp) { + if (! open(TCP, "<$tcp")) { + next; + } + while () { + next if /^\s*[A-z]/; + chomp; + # sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode + # 170: 0102000A:170C FE02000A:87FA 01 00000000:00000000 00:00000000 00000000 1001 0 423294766 1 f6fa4100 21 4 4 2 -1 + # 172: 0102000A:170C FE02000A:87FA 08 00000000:00000001 00:00000000 00000000 1001 0 423294766 1 f6fa4100 21 4 4 2 -1 + my @items = split(' ', $_); + my $state = $items[3]; + my $inode = $items[9]; + if (!defined $state || $state !~ /^\d+$/) { + next; + } + if (!defined $inode || $inode !~ /^\d+$/) { + next; + } + if ($inode == $num) { + $st = $state; + last; + } + } + close TCP; + last if $st ne ''; + } + + if ($st ne '' && $st != 1) { + return 0; + } + return 1; +} + +sub handler { + lprint("\[$$/$CURR] got SIGTERM."); + close $SOCK1 if $SOCK1; + close $SOCK2 if $SOCK2; + exit; +} + +sub hookup { + my ($sock1, $sock2, $tag) = @_; + + my $worker = fork(); + + if (! defined $worker) { + lprint("failed to fork worker: $!"); + close $sock1; + close $sock2; + return; + } elsif ($worker) { + close $sock1; + close $sock2; + wait; + } else { + cleanup(); + if (fork) { + exit 0; + } + setpgrp(0, 0); + $SOCK1 = $sock1; + $SOCK2 = $sock2; + $CURR = $tag; + $SIG{TERM} = "handler"; + $SIG{INT} = "handler"; + xfer_both($sock1, $sock2); + exit 0; + } +} + +sub xfer { + my ($in, $out) = @_; + + $RIN = $WIN = $EIN = ""; + $ROUT = ""; + vec($RIN, fileno($in), 1) = 1; + vec($WIN, fileno($in), 1) = 1; + $EIN = $RIN | $WIN; + + my $buf; + + while (1) { + my $nf = 0; + while (! $nf) { + $nf = select($ROUT=$RIN, undef, undef, undef); + } + my $len = sysread($in, $buf, 8192); + if (! defined($len)) { + next if $! =~ /^Interrupted/; + lprint("\[$$/$CURR] $!"); + last; + } elsif ($len == 0) { + lprint("\[$$/$CURR] Input is EOF."); + last; + } + my $offset = 0; + my $quit = 0; + while ($len) { + my $written = syswrite($out, $buf, $len, $offset); + if (! defined $written) { + lprint("\[$$/$CURR] Output is EOF. $!"); + $quit = 1; + last; + } + $len -= $written; + $offset += $written; + } + last if $quit; + } + close($out); + close($in); + lprint("\[$$/$CURR] finished xfer."); +} + +sub xfer_both { + my ($sock1, $sock2) = @_; + + my $parent = $$; + + my $child = fork(); + + if (! defined $child) { + lprint("$prog\[$$/$CURR] failed to fork: $!"); + return; + } + + $SIG{TERM} = "handler"; + $SIG{INT} = "handler"; + + if ($child) { + lprint("[$$/$CURR] parent 1 -> 2."); + xfer($sock1, $sock2); + select(undef, undef, undef, 0.25); + if (kill 0, $child) { + select(undef, undef, undef, 0.9); + if (kill 0, $child) { + lprint("\[$$/$CURR] kill TERM child $child"); + kill "TERM", $child; + } else { + lprint("\[$$/$CURR] child $child gone."); + } + } + } else { + select(undef, undef, undef, 0.05); + lprint("[$$/$CURR] child 2 -> 1."); + xfer($sock2, $sock1); + select(undef, undef, undef, 0.25); + if (kill 0, $parent) { + select(undef, undef, undef, 0.8); + if (kill 0, $parent) { + lprint("\[$$/$CURR] kill TERM parent $parent."); + kill "TERM", $parent; + } else { + lprint("\[$$/$CURR] parent $parent gone."); + } + } + } +} + +sub fsleep { + my ($time) = @_; + select(undef, undef, undef, $time) if $time; +} + +sub cleanup { + close $client_listen if $client_listen; + close $client_listen6 if $client_listen6; + close $server_listen if $server_listen; + close $server_listen6 if $server_listen6; + foreach my $id (keys %ID) { + close $ID{$id}{sock}; + } +} + +sub url_decode { + # for CGI mode + foreach (@_) { + tr/+/ /; + s/%([\dA-F][\dA-F])/pack("c",hex($1))/ige; + } + @_; +} + +sub check_cgi { + # check if called via CGI launcher + my $request = ''; + if (!exists $ENV{REQUEST_METHOD}) { + ; + } elsif ($ENV{REQUEST_METHOD} eq 'POST' && exists $ENV{CONTENT_LENGTH}) { + read(STDIN, $request, $ENV{CONTENT_LENGTH}); + } elsif ($ENV{REQUEST_METHOD} eq 'GET' && exists $ENV{QUERY_STRING}) { + $request = $ENV{QUERY_STRING}; + } + delete $ENV{REQUEST_METHOD} if exists $ENV{REQUEST_METHOD}; + + return if $request =~ /^\s*$/; + + my %req = &url_decode(split(/[&=]/, $request)); + + print "Content-type: text/html\n\n"; + + if (exists $req{help} && $req{help} =~ /^(true|1)$/i) { + print $usage; + exit 0; + } + + # WARNING: There may be a CGI security problem here letting + # a remote user set logfile, pidfile, and perhaps the others. + # Consider the user the CGI process runs as. Can they write to + # important files? Do the following checks and open() calls + # prevent running arbitrary commands? Please audit for your + # configuration and add extra checks. Ideally use of this script + # would be username and password protected. Consider limiting + # logfile and pidfile to reside in a fixed directory and/or not + # letting the remote user set them. + # + $ENV{ULTRAVNC_REPEATER_LOGFILE} = $req{logfile} if exists $req{logfile} && $req{logfile} !~ /[|\/<>&*+]/; + $ENV{ULTRAVNC_REPEATER_PIDFILE} = $req{pidfile} if exists $req{pidfile} && $req{pidfile} !~ /[|\/<>&*+]/; + $ENV{ULTRAVNC_REPEATER_CLIENT_PORT} = $req{cport} if exists $req{cport} && $req{cport} =~ /^\d+$/; + $ENV{ULTRAVNC_REPEATER_SERVER_PORT} = $req{sport} if exists $req{sport} && $req{sport} =~ /^\d+$/; + $ENV{ULTRAVNC_REPEATER_LOOP} = $req{loop} if exists $req{loop} && $req{loop} =~ /^(BG|1|0)$/; + $ENV{ULTRAVNC_REPEATER_NO_RFB} = 1 if exists $req{norfb} && $req{norfb} =~ /^(true|1)$/i; + $ENV{ULTRAVNC_REPEATER_CLEAN} = 1 if exists $req{clean} && $req{clean} =~ /^(true|1)$/i; + $ENV{ULTRAVNC_REPEATER_REFUSE} = 1 if exists $req{refuse} && $req{refuse} =~ /^(true|1)$/i; +} diff --git a/LICENSE b/LICENSE deleted file mode 100644 index d159169..0000000 --- a/LICENSE +++ /dev/null @@ -1,339 +0,0 @@ - GNU GENERAL PUBLIC LICENSE - Version 2, June 1991 - - Copyright (C) 1989, 1991 Free Software Foundation, Inc., - 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - Everyone is permitted to copy and distribute verbatim copies - of this license document, but changing it is not allowed. - - Preamble - - The licenses for most software are designed to take away your -freedom to share and change it. By contrast, the GNU General Public -License is intended to guarantee your freedom to share and change free -software--to make sure the software is free for all its users. This -General Public License applies to most of the Free Software -Foundation's software and to any other program whose authors commit to -using it. (Some other Free Software Foundation software is covered by -the GNU Lesser General Public License instead.) You can apply it to -your programs, too. - - When we speak of free software, we are referring to freedom, not -price. Our General Public Licenses are designed to make sure that you -have the freedom to distribute copies of free software (and charge for -this service if you wish), that you receive source code or can get it -if you want it, that you can change the software or use pieces of it -in new free programs; and that you know you can do these things. - - To protect your rights, we need to make restrictions that forbid -anyone to deny you these rights or to ask you to surrender the rights. -These restrictions translate to certain responsibilities for you if you -distribute copies of the software, or if you modify it. - - For example, if you distribute copies of such a program, whether -gratis or for a fee, you must give the recipients all the rights that -you have. You must make sure that they, too, receive or can get the -source code. And you must show them these terms so they know their -rights. - - We protect your rights with two steps: (1) copyright the software, and -(2) offer you this license which gives you legal permission to copy, -distribute and/or modify the software. - - Also, for each author's protection and ours, we want to make certain -that everyone understands that there is no warranty for this free -software. If the software is modified by someone else and passed on, we -want its recipients to know that what they have is not the original, so -that any problems introduced by others will not reflect on the original -authors' reputations. - - Finally, any free program is threatened constantly by software -patents. We wish to avoid the danger that redistributors of a free -program will individually obtain patent licenses, in effect making the -program proprietary. To prevent this, we have made it clear that any -patent must be licensed for everyone's free use or not licensed at all. - - The precise terms and conditions for copying, distribution and -modification follow. - - GNU GENERAL PUBLIC LICENSE - TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION - - 0. This License applies to any program or other work which contains -a notice placed by the copyright holder saying it may be distributed -under the terms of this General Public License. The "Program", below, -refers to any such program or work, and a "work based on the Program" -means either the Program or any derivative work under copyright law: -that is to say, a work containing the Program or a portion of it, -either verbatim or with modifications and/or translated into another -language. (Hereinafter, translation is included without limitation in -the term "modification".) Each licensee is addressed as "you". - -Activities other than copying, distribution and modification are not -covered by this License; they are outside its scope. The act of -running the Program is not restricted, and the output from the Program -is covered only if its contents constitute a work based on the -Program (independent of having been made by running the Program). -Whether that is true depends on what the Program does. - - 1. You may copy and distribute verbatim copies of the Program's -source code as you receive it, in any medium, provided that you -conspicuously and appropriately publish on each copy an appropriate -copyright notice and disclaimer of warranty; keep intact all the -notices that refer to this License and to the absence of any warranty; -and give any other recipients of the Program a copy of this License -along with the Program. - -You may charge a fee for the physical act of transferring a copy, and -you may at your option offer warranty protection in exchange for a fee. - - 2. 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See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License along - with this program; if not, write to the Free Software Foundation, Inc., - 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - -Also add information on how to contact you by electronic and paper mail. - -If the program is interactive, make it output a short notice like this -when it starts in an interactive mode: - - Gnomovision version 69, Copyright (C) year name of author - Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. - This is free software, and you are welcome to redistribute it - under certain conditions; type `show c' for details. - -The hypothetical commands `show w' and `show c' should show the appropriate -parts of the General Public License. Of course, the commands you use may -be called something other than `show w' and `show c'; they could even be -mouse-clicks or menu items--whatever suits your program. - -You should also get your employer (if you work as a programmer) or your -school, if any, to sign a "copyright disclaimer" for the program, if -necessary. Here is a sample; alter the names: - - Yoyodyne, Inc., hereby disclaims all copyright interest in the program - `Gnomovision' (which makes passes at compilers) written by James Hacker. - - , 1 April 1989 - Ty Coon, President of Vice - -This General Public License does not permit incorporating your program into -proprietary programs. If your program is a subroutine library, you may -consider it more useful to permit linking proprietary applications with the -library. If this is what you want to do, use the GNU Lesser General -Public License instead of this License. diff --git a/mz_ultravnc_repeater.pl b/mz_ultravnc_repeater.pl deleted file mode 100755 index 4997d9f..0000000 --- a/mz_ultravnc_repeater.pl +++ /dev/null @@ -1,975 +0,0 @@ -#!/usr/bin/env perl -# -# Copyright (c) 2012 by Marco Zanon -# -# Mostly based on ultravnc_repeater.pl -# Copyright (c) 2009-2012 by Karl J. Runge -# -# mz_ultravnc_repeater.pl is free software; you can redistribute it and/or -# modify it under the terms of the GNU General Public License as published by -# the Free Software Foundation; either version 2 of the License, or (at -# your option) any later version. -# -# mz_ultravnc_repeater.pl is distributed in the hope that it will be useful, -# but WITHOUT ANY WARRANTY; without even the implied warranty of -# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -# GNU General Public License for more details. -# -# You should have received a copy of the GNU General Public License -# along with mz_ultravnc_repeater.pl; if not, write to the Free Software -# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA -# or see . -# - -my $usage = ' -mz_ultravnc_repeater.pl: - perl script implementing the ultravnc repeater - proxy protocol. - -protocol: Listen on one port for vnc clients (default 5900.) - Listen on one port for vnc servers (default 5500.) - Read 250 bytes from connecting vnc client or server. - Accept ID: from clients and servers, connect them - together once both are present. - - The string "RFB 000.000\n" is sent to the client (the client - must understand this means send ID:... or host:port.) - - Also accept : from clients and make the - connection to the vnc server immediately. - - Note it is up to the client whether to encrypt the subsequent VNC - session, etc. - -Usage: mz_ultravnc_repeater.pl [options] [client_port [server_port]] - -Options: - -Use -r to refuse new server/client connections when there is an existing -server/client ID. The default is to close the previous one. (Same as -setting the ULTRAVNC_REPEATER_REFUSE env. var.) - -Use -l to set the logfile (or set the ULTRAVNC_REPEATER_LOGFILE env. var.) -E.g. "-l /var/log/repeater.log" - -To run an outer loop restarting the server if it exits use "-L" or "-L BG" -(which are the same as setting the env. var. ULTRAVNC_REPEATER_LOOP=1 -or ULTRAVNC_REPEATER_LOOP=BG) The -L BG mode forks into the background. - -Use -p to set a file to store the master pid in for your own tracking -(same as ULTRAVNC_REPEATER_PIDFILE). For example, a cronjob may supply -a -p pidfile and check if the process id stored in the file is still -running before deciding to run this script. - -Use -i to add a single ID to the list of valid ones (same as setting all -valid IDs into ULTRAVNC_REPEATER_VALIDIDS). Note that if you don\'t use -this option, every ID will be considered valid. - -Use -C or set ULTRAVNC_REPEATER_CLEAN=1 to have the script periodically -check for and close initial connections that have gone away before the -partner connects (currently only works on Linux.) - -Use -R or set ULTRAVNC_REPEATER_NO_RFB=1 to disable sending "RFB 000.000" -to the client. Then this program acts as general TCP rendezvous tool. - -Set the env. var. ULTRAVNC_REPEATER_BUFSIZE to something other than 250 -bytes to modify the ultravnc proxy handshake buffer size for your own -special application. - -You can also set client_port via -c and server_port via -s. - -Examples: - - mz_ultravnc_repeater.pl - mz_ultravnc_repeater.pl -r - mz_ultravnc_repeater.pl -i 123456 -i 234567 - mz_ultravnc_repeater.pl 5901 - mz_ultravnc_repeater.pl 5901 5501 - - env ULTRAVNC_REPEATER_LOOP=BG ULTRAVNC_REPEATER_LOGFILE=/tmp/u.log mz_ultravnc_repeater.pl ... - mz_ultravnc_repeater.pl -L BG -l /tmp/u.log ... - -Any ULTRAVNC_REPEATER_* environment variables may also be set as the initial -arguments on the command line. - -This program can also be launched via web server CGI. Please see the -subroutine check_cgi() in the script for informtion about the query -names and security issues. - -'; - -use strict; - -if (@ARGV && $ARGV[0] =~ /-h/) { - print $usage; - exit 0; -} - -if ($ENV{ULTRAVNC_REPEATER_DEBUG}) { - print STDERR "pwd: ", `pwd`; - print STDERR "zero: $0\n"; - print STDERR "ls: ", `ls -l $0`; - print STDERR "perl: ", `sh -c 'type perl'`; -} - -check_cgi(); - -my $client_port0 = 5900; -my $server_port0 = 5500; - -while (@ARGV) { - if ($ARGV[0] =~ /^-*(ULTRAVNC_REPEATER_\w+)=(.+)/) { - $ENV{$1} = $2; - shift; - } elsif ($ARGV[0] eq '-l') { - shift; - $ENV{ULTRAVNC_REPEATER_LOGFILE} = shift; - } elsif ($ARGV[0] eq '-p') { - shift; - $ENV{ULTRAVNC_REPEATER_PIDFILE} = shift; - } elsif ($ARGV[0] eq '-c') { - shift; - $ENV{ULTRAVNC_REPEATER_CLIENT_PORT} = shift; - } elsif ($ARGV[0] eq '-s') { - shift; - $ENV{ULTRAVNC_REPEATER_SERVER_PORT} = shift; - } elsif ($ARGV[0] eq '-L') { - shift; - if (@ARGV && $ARGV[0] =~ /^(1|0|BG)$/) { - $ENV{ULTRAVNC_REPEATER_LOOP} = shift; - } else { - $ENV{ULTRAVNC_REPEATER_LOOP} = '1'; - } - } elsif ($ARGV[0] eq '-R') { - shift; - if (@ARGV && $ARGV[0] =~ /^(1|0)$/) { - $ENV{ULTRAVNC_REPEATER_NO_RFB} = shift; - } else { - $ENV{ULTRAVNC_REPEATER_NO_RFB} = '1'; - } - } elsif ($ARGV[0] eq '-C') { - shift; - if (@ARGV && $ARGV[0] =~ /^(1|0)$/) { - $ENV{ULTRAVNC_REPEATER_CLEAN} = shift; - } else { - $ENV{ULTRAVNC_REPEATER_CLEAN} = '1'; - } - } elsif ($ARGV[0] eq '-r') { - shift; - if (@ARGV && $ARGV[0] =~ /^(1|0)$/) { - $ENV{ULTRAVNC_REPEATER_REFUSE} = shift; - } else { - $ENV{ULTRAVNC_REPEATER_REFUSE} = '1'; - } - } elsif ($ARGV[0] eq '-i') { - shift; - $ENV{ULTRAVNC_REPEATER_VALIDIDS} = $ENV{ULTRAVNC_REPEATER_VALIDIDS} . " " . shift; - } else { - last; - } -} - -# Set up valid IDs array -# -my @valid_ids = (); -if (length($ENV{ULTRAVNC_REPEATER_VALIDIDS}) > 0) { - # remove initial space - $ENV{ULTRAVNC_REPEATER_VALIDIDS} = substr $ENV{ULTRAVNC_REPEATER_VALIDIDS}, 1; - # split string - @valid_ids = split(/ /, $ENV{ULTRAVNC_REPEATER_VALIDIDS}); -} - -# Set up logging: -# -if (exists $ENV{ULTRAVNC_REPEATER_LOGFILE}) { - close STDOUT; - if (!open(STDOUT, ">>$ENV{ULTRAVNC_REPEATER_LOGFILE}")) { - die "mz_ultravnc_repeater.pl: $ENV{ULTRAVNC_REPEATER_LOGFILE} $!\n"; - } - close STDERR; - open(STDERR, ">&STDOUT"); -} -select(STDERR); $| = 1; -select(STDOUT); $| = 1; - -# interrupt handler: -# -my $looppid = ''; -my $pidfile = ''; -# -sub get_out { - lprint("$_[0]:\t$$ looppid=$looppid"); - if ($looppid) { - kill 'TERM', $looppid; - fsleep(0.2); - } - unlink $pidfile if $pidfile; - cleanup(); - exit 0; -} - -# logging printer: -# -sub lprint { - print STDERR scalar(localtime), ": ", @_, "\n"; -} - -# These are overridden in actual server thread: -# -$SIG{INT} = \&get_out; -$SIG{TERM} = \&get_out; - -# pidfile: -# -sub open_pidfile { - if (exists $ENV{ULTRAVNC_REPEATER_PIDFILE}) { - my $pf = $ENV{ULTRAVNC_REPEATER_PIDFILE}; - if (open(PID, ">$pf")) { - print PID "$$\n"; - close PID; - $pidfile = $pf; - } else { - lprint("could not open pidfile: $pf - $! - continuing..."); - } - delete $ENV{ULTRAVNC_REPEATER_PIDFILE}; - } -} - -#################################################################### -# Set ULTRAVNC_REPEATER_LOOP=1 to have this script create an outer loop -# restarting itself if it ever exits. Set ULTRAVNC_REPEATER_LOOP=BG to -# do this in the background as a daemon. Same as -L option. - -if (exists $ENV{ULTRAVNC_REPEATER_LOOP}) { - my $csl = $ENV{ULTRAVNC_REPEATER_LOOP}; - if ($csl ne 'BG' && $csl ne '1') { - die "mz_ultravnc_repeater.pl: invalid ULTRAVNC_REPEATER_LOOP.\n"; - } - if ($csl eq 'BG') { - # go into bg as "daemon": - setpgrp(0, 0); - my $pid = fork(); - if (! defined $pid) { - die "mz_ultravnc_repeater.pl: $!\n"; - } elsif ($pid) { - wait; - exit 0; - } - if (fork) { - exit 0; - } - setpgrp(0, 0); - close STDIN; - if (! $ENV{ULTRAVNC_REPEATER_LOGFILE}) { - close STDOUT; - close STDERR; - } - } - # delete it so children will not do the same thing: - delete $ENV{ULTRAVNC_REPEATER_LOOP}; - - if (exists $ENV{ULTRAVNC_REPEATER_PIDFILE}) { - open_pidfile(); - } - - lprint("mz_ultravnc_repeater.pl: starting service. master-pid=$$"); - while (1) { - $looppid = fork; - if (! defined $looppid) { - sleep 10; - } elsif ($looppid) { - wait; - } else { - if ($ENV{ULTRAVNC_REPEATER_DEBUG}) { - print STDERR "exec $0 ", join(' ', @ARGV), "\n"; - } - exec $0, @ARGV; - exit 1; - } - lprint("mz_ultravnc_repeater.pl: re-starting service. master-pid=$$"); - sleep 1; - } - exit 0; -} -if (exists $ENV{ULTRAVNC_REPEATER_PIDFILE}) { - open_pidfile(); -} - -# End of background/daemon stuff. -#################################################################### - -use warnings; -use IO::Socket::INET; -use IO::Select; - -# Test for INET6 support: -# -my $have_inet6 = 0; -eval "use IO::Socket::INET6;"; -$have_inet6 = 1 if $@ eq ""; -print "perl module IO::Socket::INET6 not available: no IPv6 support.\n" if ! $have_inet6; - -my $prog = 'mz_ultravnc_repeater'; -my %ID; - -my $refuse = 0; -my $init_timeout = 5; - -my $select_timeout = 15; - -if (exists $ENV{ULTRAVNC_REPEATER_REFUSE} && $ENV{ULTRAVNC_REPEATER_REFUSE}) { - $refuse = 1; - lprint("enabling refuse mode (-r)."); -} - -my $client_port = shift; -my $server_port = shift; - -if (exists $ENV{ULTRAVNC_REPEATER_CLIENT_PORT}) { - $client_port0 = $ENV{ULTRAVNC_REPEATER_CLIENT_PORT}; -} -if (exists $ENV{ULTRAVNC_REPEATER_SERVER_PORT}) { - $server_port0 = $ENV{ULTRAVNC_REPEATER_SERVER_PORT}; -} - -$client_port = $client_port0 unless $client_port; -$server_port = $server_port0 unless $server_port; - -my $uname = `uname`; -chomp $uname; - -my $repeater_bufsize = 250; -$repeater_bufsize = $ENV{ULTRAVNC_REPEATER_BUFSIZE} if exists $ENV{ULTRAVNC_REPEATER_BUFSIZE}; - -my ($RIN, $WIN, $EIN, $ROUT); - -my $client_listen = IO::Socket::INET->new( - Listen => 10, - LocalPort => $client_port, - ReuseAddr => 1, - Proto => "tcp" -); -my $err1 = $!; -my $err2 = ''; -$client_listen = '' if ! $client_listen; - -my $client_listen6 = ''; -if ($have_inet6) { - eval {$client_listen6 = IO::Socket::INET6->new( - Listen => 10, - LocalPort => $client_port, - ReuseAddr => 1, - Domain => AF_INET6, - LocalAddr => "::", - Proto => "tcp" - );}; - $err2 = $!; -} -if (! $client_listen && ! $client_listen6) { - cleanup(); - die "$prog: error: client listen on port $client_port: $err1 - $err2\n"; -} - -my $server_listen = IO::Socket::INET->new( - Listen => 10, - LocalPort => $server_port, - ReuseAddr => 1, - Proto => "tcp" -); -$err1 = $!; -$err2 = ''; -$server_listen = '' if ! $server_listen; - -my $server_listen6 = ''; -if ($have_inet6) { - eval {$server_listen6 = IO::Socket::INET6->new( - Listen => 10, - LocalPort => $server_port, - ReuseAddr => 1, - Domain => AF_INET6, - LocalAddr => "::", - Proto => "tcp" - );}; - $err2 = $!; -} -if (! $server_listen && ! $server_listen6) { - cleanup(); - die "$prog: error: server listen on port $server_port: $err1 - $err2\n"; -} - -my $select = new IO::Select(); -if (! $select) { - cleanup(); - die "$prog: select $!\n"; -} - -$select->add($client_listen) if $client_listen; -$select->add($client_listen6) if $client_listen6; -$select->add($server_listen) if $server_listen; -$select->add($server_listen6) if $server_listen6; - -$SIG{INT} = sub {cleanup(); exit;}; -$SIG{TERM} = sub {cleanup(); exit;}; - -my $SOCK1 = ''; -my $SOCK2 = ''; -my $CURR = ''; - -lprint("$prog: starting up. pid: $$"); -lprint("watching for IPv4 connections on $client_port/client.") if $client_listen; -lprint("watching for IPv4 connections on $server_port/server.") if $server_listen; -lprint("watching for IPv6 connections on $client_port/client.") if $client_listen6; -lprint("watching for IPv6 connections on $server_port/server.") if $server_listen6; -lprint("valid IDs: @valid_ids.") if (@valid_ids); - -my $alarm_sock = ''; -my $got_alarm = 0; -sub alarm_handler { - lprint("$prog: got sig alarm."); - if ($alarm_sock ne '') { - close $alarm_sock; - } - $alarm_sock = ''; - $got_alarm = 1; -} - -while (1) { - my @ready = $select->can_read($select_timeout); - foreach my $fh (@ready) { - if (($client_listen && $fh == $client_listen) || ($client_listen6 && $fh == $client_listen6)) { - lprint("new vnc client connecting."); - } elsif (($server_listen && $fh == $server_listen) || ($server_listen6 && $fh == $server_listen6)) { - lprint("new vnc server connecting."); - } - my $sock = $fh->accept(); - if (! $sock) { - lprint("$prog: accept $!"); - next; - } - lprint("remote ip is ".$sock->peerhost()); - - if (($client_listen && $fh == $client_listen) || ($client_listen6 && $fh == $client_listen6)) { - if (exists $ENV{ULTRAVNC_REPEATER_NO_RFB} && $ENV{ULTRAVNC_REPEATER_NO_RFB}) { - lprint("ULTRAVNC_REPEATER_NO_RFB: not sending RFB 000.000"); - } else { - my $str = "RFB 000.000\n"; - my $len = length $str; - my $n = syswrite($sock, $str, $len, 0); - if ($n != $len) { - lprint("$prog: bad $str write: $n != $len $!"); - close $sock; - } - } - } - - my $buf = ''; - my $size = $repeater_bufsize; - $size = 1024 unless $size; - - $SIG{ALRM} = "alarm_handler"; - $alarm_sock = $sock; - $got_alarm = 0; - alarm($init_timeout); - my $n = sysread($sock, $buf, $size); - alarm(0); - - my $idx = index($buf, "\0"); - if ($idx >= 0) { - $buf = substr($buf, 0, $idx); - } - $buf =~ s/\s*$//; - - if ($got_alarm) { - lprint("$prog: read timed out: $!"); - } elsif (! defined $n) { - lprint("$prog: read error: $!"); - } elsif ($repeater_bufsize > 0 && $n != $size) { - lprint("$prog: short read $n != $size $!"); - close $sock; - } elsif (($client_listen && $fh == $client_listen) || ($client_listen6 && $fh == $client_listen6)) { - do_new_client($sock, $buf); - } elsif (($server_listen && $fh == $server_listen) || ($server_listen6 && $fh == $server_listen6)) { - do_new_server($sock, $buf); - } - } - clean_connections(); -} - -sub clean_connections { - if (exists $ENV{ULTRAVNC_REPEATER_CLEAN} && $ENV{ULTRAVNC_REPEATER_CLEAN}) { - foreach my $id (keys %ID) { - next if !exists $ID{$id}{sock}; - if (!established($ID{$id}{sock})) { - lprint("socket for ID:$id is no longer established, closing it."); - close $ID{$id}{sock}; - delete $ID{$id}; - } - } - } -} - -sub do_new_client { - my ($sock, $buf) = @_; - - if ($buf =~ /^ID:(\w+)/) { - my $id = $1; - - if (@valid_ids) { - my $is_valid_id = 0; - for (my $i = 0; $i < ($#valid_ids + 1); $i++) { - if ($id == $valid_ids[$i]) { - $is_valid_id = 1; - last; - } - } - if (!$is_valid_id) { - lprint("refusing vnc client: ID:$id not considered valid."); - close $sock; - return; - } - } - - if (exists $ID{$id} && exists $ID{$id}{client} && $ID{$id}{client} eq "0") { - if (!established($ID{$id}{sock})) { - lprint("server socket for ID:$id is no longer established, closing it."); - close $ID{$id}{sock}; - delete $ID{$id}; - } else { - lprint("server socket for ID:$id is still established."); - } - } - if (exists $ID{$id}) { - if ($ID{$id}{client}) { - my $ref = $refuse; - if ($ref && !established($ID{$id}{sock})) { - lprint("socket for ID:$id is no longer established, closing it."); - $ref = 0; - } - if ($ref) { - lprint("refusing extra vnc client for ID:$id."); - close $sock; - return; - } else { - lprint("closing and deleting previous vnc client with ID:$id."); - close $ID{$id}{sock}; - - lprint("storing new vnc client with ID:$id."); - $ID{$id}{client} = 1; - $ID{$id}{sock} = $sock; - } - } else { - lprint("hooking up new vnc client with existing vnc server for ID:$id."); - my $sock2 = $ID{$id}{sock}; - delete $ID{$id}; - hookup($sock, $sock2, "ID:$id"); - } - } else { - lprint("storing new vnc client with ID:$id."); - $ID{$id}{client} = 1; - $ID{$id}{sock} = $sock; - } - } else { - if (@valid_ids) { - lprint("refusing vnc client: ID requested."); - close $sock; - return; - } - - my $host = ''; - my $port = ''; - if ($buf =~ /^(.+):(-?\d+)/) { - $host = $1; - $port = $2; - } else { - $host = $buf; - $port = 5900; - } - if ($port < 0) { - my $pnew = -$port; - lprint("resetting port from $port to $pnew."); - $port = $pnew; - } elsif ($port < 200) { - my $pnew = $port + 5900; - lprint("resetting port from $port to $pnew."); - $port = $pnew; - } - lprint("making vnc client connection directly to vnc server host='$host' port='$port'."); - my $sock2 = IO::Socket::INET->new( - PeerAddr => $host, - PeerPort => $port, - Proto => "tcp" - ); - if (! $sock2 && $have_inet6) { - lprint("IPv4 connect error: $!, trying IPv6 ..."); - eval{$sock2 = IO::Socket::INET6->new( - PeerAddr => $host, - PeerPort => $port, - Proto => "tcp" - );}; - lprint("IPv6 connect error: $!") if !$sock2; - } else { - lprint("IPv4 connect error: $!") if !$sock2; - } - if (!$sock2) { - lprint("failed to connect to $host:$port."); - close $sock; - return; - } - hookup($sock, $sock2, "$host:$port"); - } -} - -sub do_new_server { - my ($sock, $buf) = @_; - - if ($buf =~ /^ID:(\w+)/) { - my $id = $1; - - if (@valid_ids) { - my $is_valid_id = 0; - for (my $i = 0; $i < ($#valid_ids + 1); $i++) { - if ($id == $valid_ids[$i]) { - $is_valid_id = 1; - last; - } - } - if (!$is_valid_id) { - lprint("refusing vnc server: ID:$id not considered valid."); - close $sock; - return; - } - } - - my $store = 1; - if (exists $ID{$id} && exists $ID{$id}{client} && $ID{$id}{client} eq "1") { - if (!established($ID{$id}{sock})) { - lprint("client socket for ID:$id is no longer established, closing it."); - close $ID{$id}{sock}; - delete $ID{$id}; - } else { - lprint("client socket for ID:$id is still established."); - } - } - if (exists $ID{$id}) { - if (! $ID{$id}{client}) { - my $ref = $refuse; - if ($ref && !established($ID{$id}{sock})) { - lprint("socket for ID:$id is no longer established, closing it."); - $ref = 0; - } - if ($ref) { - lprint("refusing extra vnc server for ID:$id."); - close $sock; - return; - } else { - lprint("closing and deleting previous vnc server with ID:$id."); - close $ID{$id}{sock}; - - lprint("storing new vnc server with ID:$id."); - $ID{$id}{client} = 0; - $ID{$id}{sock} = $sock; - } - } else { - lprint("hooking up new vnc server with existing vnc client for ID:$id."); - my $sock2 = $ID{$id}{sock}; - delete $ID{$id}; - hookup($sock, $sock2, "ID:$id"); - } - } else { - lprint("storing new vnc server with ID:$id."); - $ID{$id}{client} = 0; - $ID{$id}{sock} = $sock; - } - } else { - lprint("invalid ID:NNNNN string for vnc server: $buf"); - close $sock; - return; - } -} - -sub established { - my $fh = shift; - - return established_linux_proc($fh); - - # not working: - my $est = 1; - my $str = "Z"; - my $res; - #$res = recv($fh, $str, 1, MSG_PEEK | MSG_DONTWAIT); - if (defined($res)) { - lprint("established OK: $! '$str'."); - $est = 1; - } else { - # would check for EAGAIN here to decide ... - lprint("established err: $! '$str'."); - $est = 1; - } - return $est; -} - - -sub established_linux_proc { - # hack for Linux to see if remote side has gone away: - my $fh = shift; - - # if we can't figure things out, we must return true. - if ($uname !~ /Linux/) { - return 1; - } - - my @proc_net_tcp = (); - if (-e "/proc/net/tcp") { - push @proc_net_tcp, "/proc/net/tcp"; - } - if (-e "/proc/net/tcp6") { - push @proc_net_tcp, "/proc/net/tcp6"; - } - if (! @proc_net_tcp) { - return 1; - } - - my $n = fileno($fh); - if (!defined($n)) { - return 1; - } - - my $proc_fd = "/proc/$$/fd/$n"; - if (! -e $proc_fd) { - return 1; - } - - my $val = readlink($proc_fd); - if (! defined $val || $val !~ /socket:\[(\d+)\]/) { - return 1; - } - my $num = $1; - - my $st = ''; - - foreach my $tcp (@proc_net_tcp) { - if (! open(TCP, "<$tcp")) { - next; - } - while () { - next if /^\s*[A-z]/; - chomp; - # sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode - # 170: 0102000A:170C FE02000A:87FA 01 00000000:00000000 00:00000000 00000000 1001 0 423294766 1 f6fa4100 21 4 4 2 -1 - # 172: 0102000A:170C FE02000A:87FA 08 00000000:00000001 00:00000000 00000000 1001 0 423294766 1 f6fa4100 21 4 4 2 -1 - my @items = split(' ', $_); - my $state = $items[3]; - my $inode = $items[9]; - if (!defined $state || $state !~ /^\d+$/) { - next; - } - if (!defined $inode || $inode !~ /^\d+$/) { - next; - } - if ($inode == $num) { - $st = $state; - last; - } - } - close TCP; - last if $st ne ''; - } - - if ($st ne '' && $st != 1) { - return 0; - } - return 1; -} - -sub handler { - lprint("\[$$/$CURR] got SIGTERM."); - close $SOCK1 if $SOCK1; - close $SOCK2 if $SOCK2; - exit; -} - -sub hookup { - my ($sock1, $sock2, $tag) = @_; - - my $worker = fork(); - - if (! defined $worker) { - lprint("failed to fork worker: $!"); - close $sock1; - close $sock2; - return; - } elsif ($worker) { - close $sock1; - close $sock2; - wait; - } else { - cleanup(); - if (fork) { - exit 0; - } - setpgrp(0, 0); - $SOCK1 = $sock1; - $SOCK2 = $sock2; - $CURR = $tag; - $SIG{TERM} = "handler"; - $SIG{INT} = "handler"; - xfer_both($sock1, $sock2); - exit 0; - } -} - -sub xfer { - my ($in, $out) = @_; - - $RIN = $WIN = $EIN = ""; - $ROUT = ""; - vec($RIN, fileno($in), 1) = 1; - vec($WIN, fileno($in), 1) = 1; - $EIN = $RIN | $WIN; - - my $buf; - - while (1) { - my $nf = 0; - while (! $nf) { - $nf = select($ROUT=$RIN, undef, undef, undef); - } - my $len = sysread($in, $buf, 8192); - if (! defined($len)) { - next if $! =~ /^Interrupted/; - lprint("\[$$/$CURR] $!"); - last; - } elsif ($len == 0) { - lprint("\[$$/$CURR] Input is EOF."); - last; - } - my $offset = 0; - my $quit = 0; - while ($len) { - my $written = syswrite($out, $buf, $len, $offset); - if (! defined $written) { - lprint("\[$$/$CURR] Output is EOF. $!"); - $quit = 1; - last; - } - $len -= $written; - $offset += $written; - } - last if $quit; - } - close($out); - close($in); - lprint("\[$$/$CURR] finished xfer."); -} - -sub xfer_both { - my ($sock1, $sock2) = @_; - - my $parent = $$; - - my $child = fork(); - - if (! defined $child) { - lprint("$prog\[$$/$CURR] failed to fork: $!"); - return; - } - - $SIG{TERM} = "handler"; - $SIG{INT} = "handler"; - - if ($child) { - lprint("[$$/$CURR] parent 1 -> 2."); - xfer($sock1, $sock2); - select(undef, undef, undef, 0.25); - if (kill 0, $child) { - select(undef, undef, undef, 0.9); - if (kill 0, $child) { - lprint("\[$$/$CURR] kill TERM child $child"); - kill "TERM", $child; - } else { - lprint("\[$$/$CURR] child $child gone."); - } - } - } else { - select(undef, undef, undef, 0.05); - lprint("[$$/$CURR] child 2 -> 1."); - xfer($sock2, $sock1); - select(undef, undef, undef, 0.25); - if (kill 0, $parent) { - select(undef, undef, undef, 0.8); - if (kill 0, $parent) { - lprint("\[$$/$CURR] kill TERM parent $parent."); - kill "TERM", $parent; - } else { - lprint("\[$$/$CURR] parent $parent gone."); - } - } - } -} - -sub fsleep { - my ($time) = @_; - select(undef, undef, undef, $time) if $time; -} - -sub cleanup { - close $client_listen if $client_listen; - close $client_listen6 if $client_listen6; - close $server_listen if $server_listen; - close $server_listen6 if $server_listen6; - foreach my $id (keys %ID) { - close $ID{$id}{sock}; - } -} - -sub url_decode { - # for CGI mode - foreach (@_) { - tr/+/ /; - s/%([\dA-F][\dA-F])/pack("c",hex($1))/ige; - } - @_; -} - -sub check_cgi { - # check if called via CGI launcher - my $request = ''; - if (!exists $ENV{REQUEST_METHOD}) { - ; - } elsif ($ENV{REQUEST_METHOD} eq 'POST' && exists $ENV{CONTENT_LENGTH}) { - read(STDIN, $request, $ENV{CONTENT_LENGTH}); - } elsif ($ENV{REQUEST_METHOD} eq 'GET' && exists $ENV{QUERY_STRING}) { - $request = $ENV{QUERY_STRING}; - } - delete $ENV{REQUEST_METHOD} if exists $ENV{REQUEST_METHOD}; - - return if $request =~ /^\s*$/; - - my %req = &url_decode(split(/[&=]/, $request)); - - print "Content-type: text/html\n\n"; - - if (exists $req{help} && $req{help} =~ /^(true|1)$/i) { - print $usage; - exit 0; - } - - # WARNING: There may be a CGI security problem here letting - # a remote user set logfile, pidfile, and perhaps the others. - # Consider the user the CGI process runs as. Can they write to - # important files? Do the following checks and open() calls - # prevent running arbitrary commands? Please audit for your - # configuration and add extra checks. Ideally use of this script - # would be username and password protected. Consider limiting - # logfile and pidfile to reside in a fixed directory and/or not - # letting the remote user set them. - # - $ENV{ULTRAVNC_REPEATER_LOGFILE} = $req{logfile} if exists $req{logfile} && $req{logfile} !~ /[|\/<>&*+]/; - $ENV{ULTRAVNC_REPEATER_PIDFILE} = $req{pidfile} if exists $req{pidfile} && $req{pidfile} !~ /[|\/<>&*+]/; - $ENV{ULTRAVNC_REPEATER_CLIENT_PORT} = $req{cport} if exists $req{cport} && $req{cport} =~ /^\d+$/; - $ENV{ULTRAVNC_REPEATER_SERVER_PORT} = $req{sport} if exists $req{sport} && $req{sport} =~ /^\d+$/; - $ENV{ULTRAVNC_REPEATER_LOOP} = $req{loop} if exists $req{loop} && $req{loop} =~ /^(BG|1|0)$/; - $ENV{ULTRAVNC_REPEATER_NO_RFB} = 1 if exists $req{norfb} && $req{norfb} =~ /^(true|1)$/i; - $ENV{ULTRAVNC_REPEATER_CLEAN} = 1 if exists $req{clean} && $req{clean} =~ /^(true|1)$/i; - $ENV{ULTRAVNC_REPEATER_REFUSE} = 1 if exists $req{refuse} && $req{refuse} =~ /^(true|1)$/i; -}