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Diffstat (limited to 'lib/Net/DummyInetd.pm')
-rw-r--r-- | lib/Net/DummyInetd.pm | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/lib/Net/DummyInetd.pm b/lib/Net/DummyInetd.pm new file mode 100644 index 0000000000..8dddc901e6 --- /dev/null +++ b/lib/Net/DummyInetd.pm @@ -0,0 +1,156 @@ +# Net::DummyInetd.pm +# +# Copyright (c) 1995 Graham Barr <Graham.Barr@tiuk.ti.com>. All rights +# reserved. This program is free software; you can redistribute it and/or +# modify it under the same terms as Perl itself. + +package Net::DummyInetd; + +=head1 NAME + +Net::DummyInetd - A dummy Inetd server + +=head1 SYNOPSIS + + use Net::DummyInetd; + use Net::SMTP; + + $inetd = new Net::DummyInetd qw(/usr/lib/sendmail -ba -bs); + + $smtp = Net::SMTP->new('localhost', Port => $inetd->port); + +=head1 DESCRIPTION + +C<Net::DummyInetd> is just what it's name says, it is a dummy inetd server. +Creation of a C<Net::DummyInetd> will cause a child process to be spawned off +which will listen to a socket. When a connection arrives on this socket +the specified command is fork'd and exec'd with STDIN and STDOUT file +descriptors duplicated to the new socket. + +This package was added as an example of how to use C<Net::SMTP> to connect +to a C<sendmail> process, which is not the default, via SIDIN and STDOUT. +A C<Net::Inetd> package will be avaliable in the next release of C<libnet> + +=head1 CONSTRUCTOR + +=over 4 + +=item new ( CMD ) + +Creates a new object and spawns a child process which listens to a socket. +C<CMD> is a list, which will be passed to C<exec> when a new process needs +to be created. + +=back + +=head1 METHODS + +=over 4 + +=item port + +Returns the port number on which the I<DummyInet> object is listening + +=back + +=head1 AUTHOR + +Graham Barr <Graham.Barr@tiuk.ti.com> + +=head1 REVISION + +$Revision: 1.2 $ + +The VERSION is derived from the revision by changing each number after the +first dot into a 2 digit number so + + Revision 1.8 => VERSION 1.08 + Revision 1.2.3 => VERSION 1.0203 + +=head1 COPYRIGHT + +Copyright (c) 1995 Graham Barr. All rights reserved. This program is free +software; you can redistribute it and/or modify it under the same terms +as Perl itself. + +=cut + +require 5.002; + +use IO::Handle; +use IO::Socket; +use strict; +use vars qw($VERSION); +use Carp; + +$VERSION = do{my @r=(q$Revision: 1.2 $=~/(\d+)/g);sprintf "%d."."%02d"x$#r,@r}; + + +sub _process +{ + my $listen = shift; + my @cmd = @_; + my $vec = ''; + my $r; + + vec($vec,fileno($listen),1) = 1; + + while(select($r=$vec,undef,undef,undef)) + { + my $sock = $listen->accept; + my $pid; + + if($pid = fork()) + { + sleep 1; + close($sock); + } + elsif(defined $pid) + { + my $x = IO::Handle->new_from_fd($sock,"r"); + open(STDIN,"<&=".fileno($x)) || die "$! $@"; + close($x); + + my $y = IO::Handle->new_from_fd($sock,"w"); + open(STDOUT,">&=".fileno($y)) || die "$! $@"; + close($y); + + close($sock); + exec(@cmd) || carp "$! $@"; + } + else + { + close($sock); + carp $!; + } + } + exit -1; +} + +sub new +{ + my $self = shift; + my $type = ref($self) || $self; + + my $listen = IO::Socket::INET->new(Listen => 5, Proto => 'tcp'); + my $pid; + + return bless [ $listen->sockport, $pid ] + if($pid = fork()); + + _process($listen,@_); +} + +sub port +{ + my $self = shift; + $self->[0]; +} + +sub DESTROY +{ + my $self = shift; + kill 9, $self->[1]; +} + +1; |