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# IO::Socket::INET.pm
#
# Copyright (c) 1997-8 Graham Barr <gbarr@pobox.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 IO::Socket::INET;
use strict;
use IO::Socket;
use Socket;
use Carp;
use Exporter;
use Errno;
our @ISA = qw(IO::Socket);
our $VERSION = "1.52";
my $EINVAL = exists(&Errno::EINVAL) ? Errno::EINVAL() : 1;
IO::Socket::INET->register_domain( AF_INET );
my %socket_type = ( tcp => SOCK_STREAM,
udp => SOCK_DGRAM,
icmp => SOCK_RAW
);
my %proto_number;
$proto_number{tcp} = Socket::IPPROTO_TCP() if defined &Socket::IPPROTO_TCP;
$proto_number{udp} = Socket::IPPROTO_UDP() if defined &Socket::IPPROTO_UDP;
$proto_number{icmp} = Socket::IPPROTO_ICMP() if defined &Socket::IPPROTO_ICMP;
my %proto_name = reverse %proto_number;
sub new {
my $class = shift;
unshift(@_, "PeerAddr") if @_ == 1;
return $class->SUPER::new(@_);
}
sub _cache_proto {
my @proto = @_;
for (map lc($_), $proto[0], split(' ', $proto[1])) {
$proto_number{$_} = $proto[2];
}
$proto_name{$proto[2]} = $proto[0];
}
sub _get_proto_number {
my $name = lc(shift);
return undef unless defined $name;
return $proto_number{$name} if exists $proto_number{$name};
my @proto = eval { getprotobyname($name) };
return undef unless @proto;
_cache_proto(@proto);
return $proto[2];
}
sub _get_proto_name {
my $num = shift;
return undef unless defined $num;
return $proto_name{$num} if exists $proto_name{$num};
my @proto = eval { getprotobynumber($num) };
return undef unless @proto;
_cache_proto(@proto);
return $proto[0];
}
sub _sock_info {
my($addr,$port,$proto) = @_;
my $origport = $port;
my @serv = ();
$port = $1
if(defined $addr && $addr =~ s,:([\w\(\)/]+)$,,);
if(defined $proto && $proto =~ /\D/) {
my $num = _get_proto_number($proto);
unless (defined $num) {
$IO::Socket::errstr = $@ = "Bad protocol '$proto'";
return;
}
$proto = $num;
}
if(defined $port) {
my $defport = ($port =~ s,\((\d+)\)$,,) ? $1 : undef;
my $pnum = ($port =~ m,^(\d+)$,)[0];
@serv = getservbyname($port, _get_proto_name($proto) || "")
if ($port =~ m,\D,);
$port = $serv[2] || $defport || $pnum;
unless (defined $port) {
$IO::Socket::errstr = $@ = "Bad service '$origport'";
return;
}
$proto = _get_proto_number($serv[3]) if @serv && !$proto;
}
return ($addr || undef,
$port || undef,
$proto || undef
);
}
sub _error {
my $sock = shift;
my $err = shift;
{
local($!);
my $title = ref($sock).": ";
$IO::Socket::errstr = $@ = join("", $_[0] =~ /^$title/ ? "" : $title, @_);
$sock->close()
if(defined fileno($sock));
}
$! = $err;
return undef;
}
sub _get_addr {
my($sock,$addr_str, $multi) = @_;
my @addr;
if ($multi && $addr_str !~ /^\d+(?:\.\d+){3}$/) {
(undef, undef, undef, undef, @addr) = gethostbyname($addr_str);
} else {
my $h = inet_aton($addr_str);
push(@addr, $h) if defined $h;
}
@addr;
}
sub configure {
my($sock,$arg) = @_;
my($lport,$rport,$laddr,$raddr,$proto,$type);
$arg->{LocalAddr} = $arg->{LocalHost}
if exists $arg->{LocalHost} && !exists $arg->{LocalAddr};
($laddr,$lport,$proto) = _sock_info($arg->{LocalAddr},
$arg->{LocalPort},
$arg->{Proto})
or return _error($sock, $!, $@);
$laddr = defined $laddr ? inet_aton($laddr)
: INADDR_ANY;
return _error($sock, $EINVAL, "Bad hostname '",$arg->{LocalAddr},"'")
unless(defined $laddr);
$arg->{PeerAddr} = $arg->{PeerHost}
if exists $arg->{PeerHost} && !exists $arg->{PeerAddr};
unless(exists $arg->{Listen}) {
($raddr,$rport,$proto) = _sock_info($arg->{PeerAddr},
$arg->{PeerPort},
$proto)
or return _error($sock, $!, $@);
}
$proto ||= _get_proto_number('tcp');
$type = $arg->{Type} || $socket_type{lc _get_proto_name($proto)};
my @raddr = ();
if(defined $raddr) {
@raddr = $sock->_get_addr($raddr, $arg->{MultiHomed});
return _error($sock, $EINVAL, "Bad hostname '",$arg->{PeerAddr},"'")
unless @raddr;
}
while(1) {
$sock->socket(AF_INET, $type, $proto) or
return _error($sock, $!, "$!");
if (defined $arg->{Blocking}) {
defined $sock->blocking($arg->{Blocking})
or return _error($sock, $!, "$!");
}
if ($arg->{Reuse} || $arg->{ReuseAddr}) {
$sock->sockopt(SO_REUSEADDR,1) or
return _error($sock, $!, "$!");
}
if ($arg->{ReusePort}) {
$sock->sockopt(SO_REUSEPORT,1) or
return _error($sock, $!, "$!");
}
if ($arg->{Broadcast}) {
$sock->sockopt(SO_BROADCAST,1) or
return _error($sock, $!, "$!");
}
if($lport || ($laddr ne INADDR_ANY) || exists $arg->{Listen}) {
$sock->bind($lport || 0, $laddr) or
return _error($sock, $!, "$!");
}
if(exists $arg->{Listen}) {
$sock->listen($arg->{Listen} || 5) or
return _error($sock, $!, "$!");
last;
}
# don't try to connect unless we're given a PeerAddr
last unless exists($arg->{PeerAddr});
$raddr = shift @raddr;
return _error($sock, $EINVAL, 'Cannot determine remote port')
unless($rport || $type == SOCK_DGRAM || $type == SOCK_RAW);
last
unless($type == SOCK_STREAM || defined $raddr);
return _error($sock, $EINVAL, "Bad hostname '",$arg->{PeerAddr},"'")
unless defined $raddr;
# my $timeout = ${*$sock}{'io_socket_timeout'};
# my $before = time() if $timeout;
undef $@;
if ($sock->connect(pack_sockaddr_in($rport, $raddr))) {
# ${*$sock}{'io_socket_timeout'} = $timeout;
return $sock;
}
return _error($sock, $!, $@ || "Timeout")
unless @raddr;
# if ($timeout) {
# my $new_timeout = $timeout - (time() - $before);
# return _error($sock,
# (exists(&Errno::ETIMEDOUT) ? Errno::ETIMEDOUT() : $EINVAL),
# "Timeout") if $new_timeout <= 0;
# ${*$sock}{'io_socket_timeout'} = $new_timeout;
# }
}
$sock;
}
sub connect {
@_ == 2 || @_ == 3 or
croak 'usage: $sock->connect(NAME) or $sock->connect(PORT, ADDR)';
my $sock = shift;
return $sock->SUPER::connect(@_ == 1 ? shift : pack_sockaddr_in(@_));
}
sub bind {
@_ == 2 || @_ == 3 or
croak 'usage: $sock->bind(NAME) or $sock->bind(PORT, ADDR)';
my $sock = shift;
return $sock->SUPER::bind(@_ == 1 ? shift : pack_sockaddr_in(@_))
}
sub sockaddr {
@_ == 1 or croak 'usage: $sock->sockaddr()';
my($sock) = @_;
my $name = $sock->sockname;
$name ? (sockaddr_in($name))[1] : undef;
}
sub sockport {
@_ == 1 or croak 'usage: $sock->sockport()';
my($sock) = @_;
my $name = $sock->sockname;
$name ? (sockaddr_in($name))[0] : undef;
}
sub sockhost {
@_ == 1 or croak 'usage: $sock->sockhost()';
my($sock) = @_;
my $addr = $sock->sockaddr;
$addr ? inet_ntoa($addr) : undef;
}
sub peeraddr {
@_ == 1 or croak 'usage: $sock->peeraddr()';
my($sock) = @_;
my $name = $sock->peername;
$name ? (sockaddr_in($name))[1] : undef;
}
sub peerport {
@_ == 1 or croak 'usage: $sock->peerport()';
my($sock) = @_;
my $name = $sock->peername;
$name ? (sockaddr_in($name))[0] : undef;
}
sub peerhost {
@_ == 1 or croak 'usage: $sock->peerhost()';
my($sock) = @_;
my $addr = $sock->peeraddr;
$addr ? inet_ntoa($addr) : undef;
}
1;
__END__
=head1 NAME
IO::Socket::INET - Object interface for AF_INET domain sockets
=head1 SYNOPSIS
use IO::Socket::INET;
=head1 DESCRIPTION
C<IO::Socket::INET> provides an object interface to creating and using sockets
in the AF_INET domain. It is built upon the L<IO::Socket> interface and
inherits all the methods defined by L<IO::Socket>.
=head1 CONSTRUCTOR
=over 4
=item new ( [ARGS] )
Creates an C<IO::Socket::INET> object, which is a reference to a
newly created symbol (see the L<Symbol> package). C<new>
optionally takes arguments, these arguments are in key-value pairs.
In addition to the key-value pairs accepted by L<IO::Socket>,
C<IO::Socket::INET> provides.
PeerAddr Remote host address <hostname>[:<port>]
PeerHost Synonym for PeerAddr
PeerPort Remote port or service <service>[(<no>)] | <no>
LocalAddr Local host bind address hostname[:port]
LocalHost Synonym for LocalAddr
LocalPort Local host bind port <service>[(<no>)] | <no>
Proto Protocol name (or number) "tcp" | "udp" | ...
Type Socket type SOCK_STREAM | SOCK_DGRAM | ...
Listen Queue size for listen
ReuseAddr Set SO_REUSEADDR before binding
Reuse Set SO_REUSEADDR before binding (deprecated,
prefer ReuseAddr)
ReusePort Set SO_REUSEPORT before binding
Broadcast Set SO_BROADCAST before binding
Timeout Timeout value for various operations
MultiHomed Try all addresses for multi-homed hosts
Blocking Determine if connection will be blocking mode
If C<Listen> is defined then a listen socket is created, else if the
socket type, which is derived from the protocol, is SOCK_STREAM then
connect() is called. If the C<Listen> argument is given, but false,
the queue size will be set to 5.
Although it is not illegal, the use of C<MultiHomed> on a socket
which is in non-blocking mode is of little use. This is because the
first connect will never fail with a timeout as the connect call
will not block.
The C<PeerAddr> can be a hostname or the IP-address on the
"xx.xx.xx.xx" form. The C<PeerPort> can be a number or a symbolic
service name. The service name might be followed by a number in
parenthesis which is used if the service is not known by the system.
The C<PeerPort> specification can also be embedded in the C<PeerAddr>
by preceding it with a ":".
If C<Proto> is not given and you specify a symbolic C<PeerPort> port,
then the constructor will try to derive C<Proto> from the service
name. As a last resort C<Proto> "tcp" is assumed. The C<Type>
parameter will be deduced from C<Proto> if not specified.
If the constructor is only passed a single argument, it is assumed to
be a C<PeerAddr> specification.
If C<Blocking> is set to 0, the connection will be in nonblocking mode.
If not specified it defaults to 1 (blocking mode).
Examples:
$sock = IO::Socket::INET->new(PeerAddr => 'www.perl.org',
PeerPort => 'http(80)',
Proto => 'tcp');
$sock = IO::Socket::INET->new(PeerAddr => 'localhost:smtp(25)');
$sock = IO::Socket::INET->new(Listen => 5,
LocalAddr => 'localhost',
LocalPort => 9000,
Proto => 'tcp');
$sock = IO::Socket::INET->new('127.0.0.1:25');
$sock = IO::Socket::INET->new(
PeerPort => 9999,
PeerAddr => inet_ntoa(INADDR_BROADCAST),
Proto => 'udp',
LocalAddr => 'localhost',
Broadcast => 1 )
or die "Can't bind : $IO::Socket::errstr\n";
If the constructor fails it will return C<undef> and set the
C<$IO::Socket::errstr> package variable to contain an error message.
$sock = IO::Socket::INET->new(...)
or die "Cannot create socket - $IO::Socket::errstr\n";
For legacy reasons the error message is also set into the global C<$@>
variable, and you may still find older code which looks here instead.
$sock = IO::Socket::INET->new(...)
or die "Cannot create socket - $@\n";
=back
=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
=head1 SEE ALSO
L<Socket>, L<IO::Socket>
=head1 AUTHOR
Graham Barr. Currently maintained by the Perl Porters. Please report all
bugs at L<https://github.com/Perl/perl5/issues>.
=head1 COPYRIGHT
Copyright (c) 1996-8 Graham Barr <gbarr@pobox.com>. All rights reserved.
This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
=cut