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148 lines
2.9 KiB
148 lines
2.9 KiB
# Net::DummyInetd.pm
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#
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# Copyright (c) 1995-1997 Graham Barr <[email protected]>. All rights reserved.
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# This program is free software; you can redistribute it and/or
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# modify it under the same terms as Perl itself.
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package Net::DummyInetd;
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require 5.002;
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use IO::Handle;
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use IO::Socket;
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use strict;
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use vars qw($VERSION);
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use Carp;
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$VERSION = do { my @r=(q$Revision: 1.6 $=~/\d+/g); sprintf "%d."."%02d"x$#r,@r};
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sub _process
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{
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my $listen = shift;
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my @cmd = @_;
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my $vec = '';
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my $r;
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vec($vec,fileno($listen),1) = 1;
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while(select($r=$vec,undef,undef,undef))
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{
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my $sock = $listen->accept;
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my $pid;
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if($pid = fork())
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{
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sleep 1;
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close($sock);
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}
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elsif(defined $pid)
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{
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my $x = IO::Handle->new_from_fd($sock,"r");
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open(STDIN,"<&=".fileno($x)) || die "$! $@";
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close($x);
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my $y = IO::Handle->new_from_fd($sock,"w");
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open(STDOUT,">&=".fileno($y)) || die "$! $@";
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close($y);
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close($sock);
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exec(@cmd) || carp "$! $@";
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}
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else
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{
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close($sock);
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carp $!;
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}
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}
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exit -1;
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}
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sub new
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{
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my $self = shift;
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my $type = ref($self) || $self;
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my $listen = IO::Socket::INET->new(Listen => 5, Proto => 'tcp');
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my $pid;
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return bless [ $listen->sockport, $pid ]
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if($pid = fork());
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_process($listen,@_);
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}
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sub port
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{
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my $self = shift;
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$self->[0];
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}
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sub DESTROY
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{
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my $self = shift;
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kill 9, $self->[1];
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}
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1;
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__END__
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=head1 NAME
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Net::DummyInetd - A dummy Inetd server
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=head1 SYNOPSIS
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use Net::DummyInetd;
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use Net::SMTP;
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$inetd = new Net::DummyInetd qw(/usr/lib/sendmail -ba -bs);
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$smtp = Net::SMTP->new('localhost', Port => $inetd->port);
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=head1 DESCRIPTION
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C<Net::DummyInetd> is just what it's name says, it is a dummy inetd server.
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Creation of a C<Net::DummyInetd> will cause a child process to be spawned off
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which will listen to a socket. When a connection arrives on this socket
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the specified command is fork'd and exec'd with STDIN and STDOUT file
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descriptors duplicated to the new socket.
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This package was added as an example of how to use C<Net::SMTP> to connect
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to a C<sendmail> process, which is not the default, via SIDIN and STDOUT.
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A C<Net::Inetd> package will be available in the next release of C<libnet>
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=head1 CONSTRUCTOR
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=over 4
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=item new ( CMD )
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Creates a new object and spawns a child process which listens to a socket.
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C<CMD> is a list, which will be passed to C<exec> when a new process needs
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to be created.
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=back
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=head1 METHODS
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=over 4
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=item port
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Returns the port number on which the I<DummyInetd> object is listening
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=back
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=head1 AUTHOR
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Graham Barr <[email protected]>
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=head1 COPYRIGHT
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Copyright (c) 1995-1997 Graham Barr. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the same terms as Perl itself.
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=cut
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