/usr/share/perl5/IM/Ssh.pm is in im 1:151-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 | # -*-Perl-*-
################################################################
###
### Ssh.pm
###
### Author: Masatoshi Tsuchiya <tsuchiya@pine.kuee.kyoto-u.ac.jp>
### Internet Message Group <img@mew.org>
### Created: Oct 05, 1999
### Revised: Apr 23, 2007
###
my $PM_VERSION = "IM::Ssh.pm version 20110525(IM151)";
package IM::Ssh;
require 5.003;
require Exporter;
use IM::Config qw(connect_timeout command_timeout ssh_path);
use IM::Util;
use strict;
use vars qw(@ISA @EXPORT @EXPORT_OK %EXPORT_TAGS $SSH $FH @PID);
@ISA = qw(Exporter);
@EXPORT = qw(ssh_proxy);
# Global Variables
$FH = "SSH00000";
@PID = ();
sub ssh_proxy($$$$) {
my($server, $remote, $local, $host) = @_;
my $prog = ssh_path();
unless ($host) {
im_err("Missing relay host.\n");
return 0;
}
im_notice("openning SSH-tunnel to $server/$remote\%$local via $host\n")
if &verbose;
my($pid, $read, $write);
FORK: {
no strict 'refs';
$read = $FH++;
$write = $FH++;
pipe($read, $write);
if ($pid = fork) {
close $write;
my($buf, $sig, $i);
for ($i=0; $i<3; $i++) {
$sig = $SIG{ALRM};
$SIG{ALRM} = sub { die "SIGALRM is received\n"; };
eval {
alarm &connect_timeout();
$buf = <$read>;
alarm 0;
};
$SIG{ALRM} = $sig;
if ($@ !~ /SIGALRM is received/) {
push(@PID, $pid);
if ($buf =~ /ssh_proxy_connect/) {
return $local;
} elsif ($buf =~ /Local: bind: Address already in use/) {
$local++;
redo FORK;
} elsif ($buf) {
last;
}
}
}
$buf =~ s/\s+$//;
$buf =~ s/\n/\\n/g;
im_warn("Accident in Port Forwading: $buf\n");
} elsif ($pid == 0) {
close $read;
open(STDOUT, ">&$write");
open(STDERR, ">&$write");
exec($prog, '-n', '-x', '-o', 'BatchMode yes',
"-L$local:$server:$remote", $host,
sprintf('echo ssh_proxy_connect ; sleep %s',
&command_timeout()));
exit 0; # Not reach.
} elsif ($! =~ /No more process/) {
sleep 5;
redo FORK;
} else {
im_warn("Can't fork $prog.\n");
}
}
0;
}
sub END {
if (@PID) {
kill 15, @PID;
sleep 3;
kill 9, @PID;
}
}
1;
__END__
=head1 NAME
IM::Ssh - SSH handler
=head1 SYNOPSIS
use IM::Ssh;
if ($remote = ssh_proxy($server, $remote, $local, $host)) {
# connection succeeded
} else {
# connection failed
}
=head1 DESCRIPTION
The I<IM::Ssh> module handles SSH.
This modules is provided by IM (Internet Message).
=head1 COPYRIGHT
IM (Internet Message) is copyrighted by IM developing team.
You can redistribute it and/or modify it under the modified BSD
license. See the copyright file for more details.
=cut
### Copyright (C) 1997, 1998, 1999 IM developing team
### All rights reserved.
###
### Redistribution and use in source and binary forms, with or without
### modification, are permitted provided that the following conditions
### are met:
###
### 1. Redistributions of source code must retain the above copyright
### notice, this list of conditions and the following disclaimer.
### 2. Redistributions in binary form must reproduce the above copyright
### notice, this list of conditions and the following disclaimer in the
### documentation and/or other materials provided with the distribution.
### 3. Neither the name of the team nor the names of its contributors
### may be used to endorse or promote products derived from this software
### without specific prior written permission.
###
### THIS SOFTWARE IS PROVIDED BY THE TEAM AND CONTRIBUTORS ``AS IS'' AND
### ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
### IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
### PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE TEAM OR CONTRIBUTORS BE
### LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
### CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
### SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
### BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
### WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
### OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
### IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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