From: Marco Zanon Date: Sun, 19 Feb 2012 10:56:20 +0000 (+0000) Subject: Initial import. X-Git-Tag: 0.9~1 X-Git-Url: https://gitweb.marcozanon.com/?a=commitdiff_plain;h=d5df6fd6aadfbccb63b0322df2b504783d3d7f94;p=mz_ultravnc_repeater Initial import. --- d5df6fd6aadfbccb63b0322df2b504783d3d7f94 diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..d159169 --- /dev/null +++ b/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. 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. 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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/mz_ultravnc_repeater.pl b/mz_ultravnc_repeater.pl new file mode 100755 index 0000000..9cec96f --- /dev/null +++ b/mz_ultravnc_repeater.pl @@ -0,0 +1,974 @@ +#!/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; + } + + 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; +}