#

package IO::Socket;

=head1 NAME

IO::Socket - Object interface to socket communications

=head1 SYNOPSIS

    use IO::Socket;

=head1 DESCRIPTION

C<IO::Socket> provides an object interface to creating and using sockets. It
is built upon the L<IO::Handle> interface and inherits all the methods defined
by L<IO::Handle>.

C<IO::Socket> only defines methods for those operations which are common to all
types of socket. Operations which are specified to a socket in a particular 
domain have methods defined in sub classes of C<IO::Socket>

=head1 CONSTRUCTOR

=over 4

=item new ( [ARGS] )

Creates a C<IO::Pipe>, which is a reference to a
newly created symbol (see the C<Symbol> package). C<new>
optionally takes arguments, these arguments are in key-value pairs.
C<new> only looks for one key C<Domain> which tells new which domain
the socket it will be. All other arguments will be passed to the
configuration method of the package for that domain, See below.

=back

=head1 METHODS

See L<perlfunc> for complete descriptions of each of the following
supported C<IO::Seekable> methods, which are just front ends for the
corresponding built-in functions:

    socket
    socketpair
    bind
    listen
    accept
    send
    recv
    peername (getpeername)
    sockname (getsockname)

Some methods take slightly different arguments to those defined in L<perlfunc>
in attempt to make the interface more flexible. These are

=over 4

=item accept([PKG])

perform the system call C<accept> on the socket and return a new object. The
new object will be created in the same class as the listen socket, unless
C<PKG> is specified. This object can be used to communicate with the client
that was trying to connect. In a scalar context the new socket is returned,
or undef upon failure. In an array context a two-element array is returned
containing the new socket and the peer address, the list will
be empty upon failure.

Additional methods that are provided are

=item timeout([VAL])

Set or get the timeout value associated with this socket. If called without
any arguments then the current setting is returned. If called with an argument
the current setting is changed and the previous value returned.

=item sockopt(OPT [, VAL])

Unified method to both set and get options in the SOL_SOCKET level. If called
with one argument then getsockopt is called, otherwise setsockopt is called.

=item sockdomain

Returns the numerical number for the socket domain type. For example, fir
a AF_INET socket the value of &AF_INET will be returned.

=item socktype

Returns the numerical number for the socket type. For example, fir
a SOCK_STREAM socket the value of &SOCK_STREAM will be returned.

=item protocol

Returns the numerical number for the protocol being used on the socket, if
known. If the protocol is unknown, as with an AF_UNIX socket, zero
is returned.

=back

=cut


require 5.000;

use Config;
use IO::Handle;
use Socket 1.3;
use Carp;
use strict;
use vars qw(@ISA @EXPORT_OK $VERSION);
use Exporter;

@ISA = qw(IO::Handle);

# This one will turn 1.2 => 1.02 and 1.2.3 => 1.0203 and so on ...

$VERSION = do{my @r=(q$Revision: 1.13 $=~/(\d+)/g);sprintf "%d."."%02d"x$#r,@r};

sub import {
    my $pkg = shift;
    my $callpkg = caller;
    Exporter::export 'Socket', $callpkg, @_;
}

sub new {
    my($class,%arg) = @_;
    my $fh = $class->SUPER::new();

    ${*$fh}{'io_socket_timeout'} = delete $arg{Timeout};

    return scalar(%arg) ? $fh->configure(\%arg)
			: $fh;
}

my @domain2pkg = ();

sub register_domain {
    my($p,$d) = @_;
    $domain2pkg[$d] = bless \$d, $p;
}

sub _domain2pkg {
    my $domain = shift;

    croak "Unsupported socket domain"
	unless defined $domain2pkg[$domain];

    $domain2pkg[$domain]
}

sub configure {
    my($fh,$arg) = @_;
    my $domain = delete $arg->{Domain};

    croak 'IO::Socket: Cannot configure a generic socket'
	unless defined $domain;

    my $sub = ref(_domain2pkg($domain)) . "::configure";

    goto &{$sub}
	if(defined &{$sub});

    croak "IO::Socket: Cannot configure socket in domain '$domain' $sub";
}

sub socket {
    @_ == 4 or croak 'usage: $fh->socket(DOMAIN, TYPE, PROTOCOL)';
    my($fh,$domain,$type,$protocol) = @_;

    if(!defined ${*$fh}{'io_socket_domain'}
	|| !ref(${*$fh}{'io_socket_domain'})
	|| ${${*$fh}{'io_socket_domain'}} != $domain) {
	my $pkg = 
	${*$fh}{'io_socket_domain'} = _domain2pkg($domain);
    }

    socket($fh,$domain,$type,$protocol) or
    	return undef;

    ${*$fh}{'io_socket_type'}  = $type;
    ${*$fh}{'io_socket_proto'} = $protocol;
    $fh;
}

sub socketpair {
    @_ == 4 || croak 'usage: IO::Socket->pair(DOMAIN, TYPE, PROTOCOL)';
    my($class,$domain,$type,$protocol) = @_;
    my $fh1 = $class->new();
    my $fh2 = $class->new();

    socketpair($fh1,$fh1,$domain,$type,$protocol) or
    	return ();

    ${*$fh1}{'io_socket_type'}  = ${*$fh2}{'io_socket_type'}  = $type;
    ${*$fh1}{'io_socket_proto'} = ${*$fh2}{'io_socket_proto'} = $protocol;

    ($fh1,$fh2);
}

sub connect {
    @_ == 2 || @_ == 3 or croak 'usage: $fh->connect(NAME) or $fh->connect(PORT, ADDR)';
    my $fh = shift;
    my $addr = @_ == 1 ? shift : sockaddr_in(@_);
    my $timeout = ${*$fh}{'io_socket_timeout'};
    local($SIG{ALRM}) = $timeout ? sub { undef $fh; }
				 : $SIG{ALRM} || 'DEFAULT';

     eval {
    	croak 'connect: Bad address'
    	    if(@_ == 2 && !defined $_[1]);

    	if($timeout) {
    	    defined $Config{d_alarm} && defined alarm($timeout) or
    	    	$timeout = 0;
    	}

	my $ok = connect($fh, $addr);

    	alarm(0)
    	    if($timeout);

	croak "connect: timeout"
	    unless defined $fh;

	undef $fh unless $ok;
    };

    $fh;
}

sub bind {
    @_ == 2 || @_ == 3 or croak 'usage: $fh->bind(NAME) or $fh->bind(PORT, ADDR)';
    my $fh = shift;
    my $addr = @_ == 1 ? shift : sockaddr_in(@_);

    return bind($fh, $addr) ? $fh
			    : undef;
}

sub listen {
    @_ >= 1 && @_ <= 2 or croak 'usage: $fh->listen([QUEUE])';
    my($fh,$queue) = @_;
    $queue = 5
	unless $queue && $queue > 0;

    return listen($fh, $queue) ? $fh
			       : undef;
}

sub accept {
    @_ == 1 || @_ == 2 or croak 'usage $fh->accept([PKG])';
    my $fh = shift;
    my $pkg = shift || $fh;
    my $timeout = ${*$fh}{'io_socket_timeout'};
    my $new = $pkg->new(Timeout => $timeout);
    my $peer = undef;

    eval {
    	if($timeout) {
    	    my $fdset = "";
    	    vec($fdset, $fh->fileno,1) = 1;
    	    croak "accept: timeout"
    	    	unless select($fdset,undef,undef,$timeout);
    	}
    	$peer = accept($new,$fh);
    };

    return wantarray ? defined $peer ? ($new, $peer)
    	    	    	    	     : () 
    	      	     : defined $peer ? $new
    	    	    	    	     : undef;
}

sub sockname {
    @_ == 1 or croak 'usage: $fh->sockname()';
    getsockname($_[0]);
}

sub peername {
    @_ == 1 or croak 'usage: $fh->peername()';
    my($fh) = @_;
    getpeername($fh)
      || ${*$fh}{'io_socket_peername'}
      || undef;
}

sub send {
    @_ >= 2 && @_ <= 4 or croak 'usage: $fh->send(BUF, [FLAGS, [TO]])';
    my $fh    = $_[0];
    my $flags = $_[2] || 0;
    my $peer  = $_[3] || $fh->peername;

    croak 'send: Cannot determine peer address'
	 unless($peer);

    my $r = defined(getpeername($fh))
	? send($fh, $_[1], $flags)
	: send($fh, $_[1], $flags, $peer);

    # remember who we send to, if it was sucessful
    ${*$fh}{'io_socket_peername'} = $peer
	if(@_ == 4 && defined $r);

    $r;
}

sub recv {
    @_ == 3 || @_ == 4 or croak 'usage: $fh->recv(BUF, LEN [, FLAGS])';
    my $sock  = $_[0];
    my $len   = $_[2];
    my $flags = $_[3] || 0;

    # remember who we recv'd from
    ${*$sock}{'io_socket_peername'} = recv($sock, $_[1]='', $len, $flags);
}


sub setsockopt {
    @_ == 4 or croak '$fh->setsockopt(LEVEL, OPTNAME)';
    setsockopt($_[0],$_[1],$_[2],$_[3]);
}

my $intsize = length(pack("i",0));

sub getsockopt {
    @_ == 3 or croak '$fh->getsockopt(LEVEL, OPTNAME)';
    my $r = getsockopt($_[0],$_[1],$_[2]);
    # Just a guess
    $r = unpack("i", $r)
	if(defined $r && length($r) == $intsize);
    $r;
}

sub sockopt {
    my $fh = shift;
    @_ == 1 ? $fh->getsockopt(SOL_SOCKET,@_)
	    : $fh->setsockopt(SOL_SOCKET,@_);
}

sub timeout {
    @_ == 1 || @_ == 2 or croak 'usage: $fh->timeout([VALUE])';
    my($fh,$val) = @_;
    my $r = ${*$fh}{'io_socket_timeout'} || undef;

    ${*$fh}{'io_socket_timeout'} = 0 + $val
	if(@_ == 2);

    $r;
}

sub sockdomain {
    @_ == 1 or croak 'usage: $fh->sockdomain()';
    my $fh = shift;
    ${${*$fh}{'io_socket_domain'}}
}

sub socktype {
    @_ == 1 or croak 'usage: $fh->socktype()';
    my $fh = shift;
    ${*$fh}{'io_socket_type'}
}

sub protocol {
    @_ == 1 or croak 'usage: $fh->protocol()';
    my($fh) = @_;
    ${*$fh}{'io_socket_protocol'};
}

sub _addmethod {
    my $self = shift;
    my $name;

    foreach $name (@_) {
	my $n = $name;

	no strict qw(refs);

	*{$n} = sub { 
		    my $pkg = ref(${*{$_[0]}}{'io_socket_domain'});
		    my $sub = "${pkg}::${n}";
		    goto &{$sub} if defined &{$sub};
		    croak qq{Can't locate object method "$n" via package "$pkg"};
		}
		unless defined &{$n};
    }

}


=head1 SUB-CLASSES

=cut

##
## AF_INET
##

package IO::Socket::INET;

use strict;
use vars qw(@ISA $VERSION);
use Socket;
use Carp;
use Exporter;

@ISA = qw(IO::Socket);

IO::Socket::INET->_addmethod( qw(sockaddr sockport sockhost peeraddr peerport peerhost));
IO::Socket::INET->register_domain( AF_INET );

my %socket_type = ( tcp => SOCK_STREAM,
		    udp => SOCK_DGRAM,
		  );

=head2 IO::Socket::INET

C<IO::Socket::INET> provides a constructor to create an AF_INET domain socket
and some related methods. The constructor can take the following options

    PeerAddr	Remote host address
    PeerPort	Remote port or service
    LocalPort	Local host bind	port
    LocalAddr	Local host bind	address
    Proto	Protocol name (eg tcp udp etc)
    Type	Socket type (SOCK_STREAM etc)
    Listen	Queue size for listen
    Timeout	Timeout	value for various operations


If Listen is defined then a listen socket is created, else if the socket
type,   which is derived from the protocol, is SOCK_STREAM then a connect
is called.

Only one of C<Type> or C<Proto> needs to be specified, one will be assumed
from the other.

=head2 METHODS

=over 4

=item sockaddr ()

Return the address part of the sockaddr structure for the socket

=item sockport ()

Return the port number that the socket is using on the local host

=item sockhost ()

Return the address part of the sockaddr structure for the socket in a
text form xx.xx.xx.xx

=item peeraddr ()

Return the address part of the sockaddr structure for the socket on
the peer host

=item peerport ()

Return the port number for the socket on the peer host.

=item peerhost ()

Return the address part of the sockaddr structure for the socket on the
peer host in a text form xx.xx.xx.xx

=back

=cut


sub _sock_info {
  my($addr,$port,$proto) = @_;
  my @proto = ();
  my @serv = ();

  $port = $1
	if(defined $addr && $addr =~ s,:([\w\(\)/]+)$,,);

  if(defined $proto) {
    @proto = $proto =~ m,\D, ? getprotobyname($proto)
			     : getprotobynumber($proto);

    $proto = $proto[2] || undef;
  }

  if(defined $port) {
    $port =~ s,\((\d+)\)$,,;

    my $defport = $1 || undef;
    my $pnum = ($port =~ m,^(\d+)$,)[0];

    @serv= getservbyname($port, $proto[0] || "")
	if($port =~ m,\D,);

    $port = $pnum || $serv[2] || $defport || undef;

    $proto = (getprotobyname($serv[3]))[2] || undef
	if @serv && !$proto;
  }

 return ($addr || undef,
	 $port || undef,
	 $proto || undef
	);
}

sub _error {
    my $fh = shift;
    carp join("",ref($fh),": ",@_) if @_;
    close($fh)
	if(defined fileno($fh));
    return undef;
}

sub configure {
    my($fh,$arg) = @_;
    my($lport,$rport,$laddr,$raddr,$proto,$type);


    ($laddr,$lport,$proto) = _sock_info($arg->{LocalAddr},
					$arg->{LocalPort},
					$arg->{Proto});

    $laddr = defined $laddr ? inet_aton($laddr)
			    : INADDR_ANY;

    return _error($fh,"Bad hostname '",$arg->{LocalAddr},"'")
	unless(defined $laddr);

    unless(exists $arg->{Listen}) {
	($raddr,$rport,$proto) = _sock_info($arg->{PeerAddr},
					    $arg->{PeerPort},
					    $proto);
    }

    if(defined $raddr) {
	$raddr = inet_aton($raddr);
	return _error($fh,"Bad hostname '",$arg->{PeerAddr},"'")
		unless(defined $raddr);
    }

    return _error($fh,'Cannot determine protocol')
	unless($proto);

    my $pname = (getprotobynumber($proto))[0];
    $type = $arg->{Type} || $socket_type{$pname};

    my $domain = AF_INET;
    ${*$fh}{'io_socket_domain'} = bless \$domain;

    $fh->socket(AF_INET, $type, $proto) or
	return _error($fh);

    $fh->bind($lport || 0, $laddr) or
	return _error($fh);

    if(exists $arg->{Listen}) {
	$fh->listen($arg->{Listen} || 5) or
	    return _error($fh);
    }
    else {
	return _error($fh,'Cannot determine remote port')
		unless($rport || $type == SOCK_DGRAM);

	if($type == SOCK_STREAM || defined $raddr) {
	    return _error($fh,'Bad peer address')
	    	unless(defined $raddr);

	    $fh->connect($rport,$raddr) or
		return _error($fh);
	}
    }

    $fh;
}

sub sockaddr {
    @_ == 1 or croak 'usage: $fh->sockaddr()';
    my($fh) = @_;
    (sockaddr_in($fh->sockname))[1];
}

sub sockport {
    @_ == 1 or croak 'usage: $fh->sockport()';
    my($fh) = @_;
    (sockaddr_in($fh->sockname))[0];
}

sub sockhost {
    @_ == 1 or croak 'usage: $fh->sockhost()';
    my($fh) = @_;
    inet_ntoa($fh->sockaddr);
}

sub peeraddr {
    @_ == 1 or croak 'usage: $fh->peeraddr()';
    my($fh) = @_;
    (sockaddr_in($fh->peername))[1];
}

sub peerport {
    @_ == 1 or croak 'usage: $fh->peerport()';
    my($fh) = @_;
    (sockaddr_in($fh->peername))[0];
}

sub peerhost {
    @_ == 1 or croak 'usage: $fh->peerhost()';
    my($fh) = @_;
    inet_ntoa($fh->peeraddr);
}

##
## AF_UNIX
##

package IO::Socket::UNIX;

use strict;
use vars qw(@ISA $VERSION);
use Socket;
use Carp;
use Exporter;

@ISA = qw(IO::Socket);

IO::Socket::UNIX->_addmethod(qw(hostpath peerpath));
IO::Socket::UNIX->register_domain( AF_UNIX );

=head2 IO::Socket::UNIX

C<IO::Socket::UNIX> provides a constructor to create an AF_UNIX domain socket
and some related methods. The constructor can take the following options

    Type    	Type of socket (eg SOCK_STREAM or SOCK_DGRAM)
    Local   	Path to local fifo
    Peer    	Path to peer fifo
    Listen  	Create a listen socket

=head2 METHODS

=over 4

=item hostpath()

Returns the pathname to the fifo at the local end.

=item peerpath()

Returns the pathanme to the fifo at the peer end.

=back

=cut

sub configure {
    my($fh,$arg) = @_;
    my($bport,$cport);

    my $type = $arg->{Type} || SOCK_STREAM;

    my $domain = AF_UNIX;
    ${*$fh}{'io_socket_domain'} = bless \$domain;

    $fh->socket(AF_UNIX, $type, 0) or
	return undef;

    if(exists $arg->{Local}) {
	my $addr = sockaddr_un($arg->{Local});
	$fh->bind($addr) or
	    return undef;
    }
    if(exists $arg->{Listen}) {
	$fh->listen($arg->{Listen} || 5) or
	    return undef;
    }
    elsif(exists $arg->{Peer}) {
	my $addr = sockaddr_un($arg->{Peer});
	$fh->connect($addr) or
	    return undef;
    }

    $fh;
}

sub hostpath {
    @_ == 1 or croak 'usage: $fh->hostpath()';
    my $n = $_[0]->sockname || return undef;
warn length($n);
    (sockaddr_un($n))[0];
}

sub peerpath {
    @_ == 1 or croak 'usage: $fh->peerpath()';
    my $n = $_[0]->peername || return undef;
warn length($n);
my @n = sockaddr_un($n);
warn join(",",@n);
    (sockaddr_un($n))[0];
}

=head1 AUTHOR

Graham Barr E<lt>F<Graham.Barr@tiuk.ti.com>E<gt>

=head1 REVISION

$Revision: 1.13 $

The VERSION is derived from the revision turning 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

1; # Keep require happy