Geek Gadgets 1/ADE-1.bin/ade-dist/perl-5.003-bin.lha/lib/perl5/Socket.pm

Perl POD Document | 1996-10-10 | 6.9 KB | 279 lines

package Socket;

use vars qw($VERSION @ISA @EXPORT);
$VERSION = "1.5";

=head1 NAME

Socket, sockaddr_in, sockaddr_un, inet_aton, inet_ntoa - load the C socket.h defines and structure manipulators

=head1 SYNOPSIS

    use Socket;

    $proto = getprotobyname('udp');
    socket(Socket_Handle, PF_INET, SOCK_DGRAM, $proto);
    $iaddr = gethostbyname('hishost.com');
    $port = getservbyname('time', 'udp');
    $sin = sockaddr_in($port, $iaddr);
    send(Socket_Handle, 0, 0, $sin);

    $proto = getprotobyname('tcp');
    socket(Socket_Handle, PF_INET, SOCK_STREAM, $proto);
    $port = getservbyname('smtp');
    $sin = sockaddr_in($port,inet_aton("127.1"));
    $sin = sockaddr_in(7,inet_aton("localhost"));
    $sin = sockaddr_in(7,INADDR_LOOPBACK);
    connect(Socket_Handle,$sin);

    ($port, $iaddr) = sockaddr_in(getpeername(Socket_Handle));
    $peer_host = gethostbyaddr($iaddr, AF_INET);
    $peer_addr = inet_ntoa($iaddr);

    $proto = getprotobyname('tcp');
    socket(Socket_Handle, PF_UNIX, SOCK_STREAM, $proto);
    unlink('/tmp/usock');
    $sun = sockaddr_un('/tmp/usock');
    connect(Socket_Handle,$sun);

=head1 DESCRIPTION

This module is just a translation of the C F<socket.h> file.
Unlike the old mechanism of requiring a translated F<socket.ph>
file, this uses the B<h2xs> program (see the Perl source distribution)
and your native C compiler.  This means that it has a
far more likely chance of getting the numbers right.  This includes
all of the commonly used pound-defines like AF_INET, SOCK_STREAM, etc.

In addition, some structure manipulation functions are available:

=item inet_aton HOSTNAME

Takes a string giving the name of a host, and translates that
to the 4-byte string (structure). Takes arguments of both
the 'rtfm.mit.edu' type and '18.181.0.24'. If the host name
cannot be resolved, returns undef.

=item inet_ntoa IP_ADDRESS

Takes a four byte ip address (as returned by inet_aton())
and translates it into a string of the form 'd.d.d.d'
where the 'd's are numbers less than 256 (the normal
readable four dotted number notation for internet addresses).

=item INADDR_ANY

Note: does not return a number, but a packed string.

Returns the 4-byte wildcard ip address which specifies any
of the hosts ip addresses. (A particular machine can have
more than one ip address, each address corresponding to
a particular network interface. This wildcard address
allows you to bind to all of them simultaneously.)
Normally equivalent to inet_aton('0.0.0.0').

=item INADDR_LOOPBACK

Note - does not return a number.

Returns the 4-byte loopback address. Normally equivalent
to inet_aton('localhost').

=item INADDR_NONE

Note - does not return a number.

Returns the 4-byte invalid ip address. Normally equivalent
to inet_aton('255.255.255.255').

=item sockaddr_in PORT, ADDRESS

=item sockaddr_in SOCKADDR_IN

In an array context, unpacks its SOCKADDR_IN argument and returns an array
consisting of (PORT, ADDRESS).  In a scalar context, packs its (PORT,
ADDRESS) arguments as a SOCKADDR_IN and returns it.  If this is confusing,
use pack_sockaddr_in() and unpack_sockaddr_in() explicitly.

=item pack_sockaddr_in PORT, IP_ADDRESS

Takes two arguments, a port number and a 4 byte IP_ADDRESS (as returned by
inet_aton()). Returns the sockaddr_in structure with those arguments
packed in with AF_INET filled in.  For internet domain sockets, this
structure is normally what you need for the arguments in bind(),
connect(), and send(), and is also returned by getpeername(),
getsockname() and recv().

=item unpack_sockaddr_in SOCKADDR_IN

Takes a sockaddr_in structure (as returned by pack_sockaddr_in()) and
returns an array of two elements: the port and the 4-byte ip-address.
Will croak if the structure does not have AF_INET in the right place.

=item sockaddr_un PATHNAME

=item sockaddr_un SOCKADDR_UN

In an array context, unpacks its SOCKADDR_UN argument and returns an array
consisting of (PATHNAME).  In a scalar context, packs its PATHANE
arguments as a SOCKADDR_UN and returns it.  If this is confusing, use
pack_sockaddr_un() and unpack_sockaddr_un() explicitly.
These are only supported if your system has <sys/un.h>.

=item pack_sockaddr_un PATH

Takes one argument, a pathname. Returns the sockaddr_un structure with
that path packed in with AF_UNIX filled in. For unix domain sockets, this
structure is normally what you need for the arguments in bind(),
connect(), and send(), and is also returned by getpeername(),
getsockname() and recv().

=item unpack_sockaddr_un SOCKADDR_UN

Takes a sockaddr_un structure (as returned by pack_sockaddr_un())
and returns the pathname.  Will croak if the structure does not
have AF_UNIX in the right place.

=cut

use Carp;

require Exporter;
use AutoLoader;
require DynaLoader;
@ISA = qw(Exporter DynaLoader);
@EXPORT = qw(
    inet_aton inet_ntoa pack_sockaddr_in unpack_sockaddr_in
    pack_sockaddr_un unpack_sockaddr_un
    sockaddr_in sockaddr_un
    INADDR_ANY INADDR_LOOPBACK INADDR_NONE
    AF_802
    AF_APPLETALK
    AF_CCITT
    AF_CHAOS
    AF_DATAKIT
    AF_DECnet
    AF_DLI
    AF_ECMA
    AF_GOSIP
    AF_HYLINK
    AF_IMPLINK
    AF_INET
    AF_LAT
    AF_MAX
    AF_NBS
    AF_NIT
    AF_NS
    AF_OSI
    AF_OSINET
    AF_PUP
    AF_SNA
    AF_UNIX
    AF_UNSPEC
    AF_X25
    MSG_DONTROUTE
    MSG_MAXIOVLEN
    MSG_OOB
    MSG_PEEK
    PF_802
    PF_APPLETALK
    PF_CCITT
    PF_CHAOS
    PF_DATAKIT
    PF_DECnet
    PF_DLI
    PF_ECMA
    PF_GOSIP
    PF_HYLINK
    PF_IMPLINK
    PF_INET
    PF_LAT
    PF_MAX
    PF_NBS
    PF_NIT
    PF_NS
    PF_OSI
    PF_OSINET
    PF_PUP
    PF_SNA
    PF_UNIX
    PF_UNSPEC
    PF_X25
    SOCK_DGRAM
    SOCK_RAW
    SOCK_RDM
    SOCK_SEQPACKET
    SOCK_STREAM
    SOL_SOCKET
    SOMAXCONN
    SO_ACCEPTCONN
    SO_BROADCAST
    SO_DEBUG
    SO_DONTLINGER
    SO_DONTROUTE
    SO_ERROR
    SO_KEEPALIVE
    SO_LINGER
    SO_OOBINLINE
    SO_RCVBUF
    SO_RCVLOWAT
    SO_RCVTIMEO
    SO_REUSEADDR
    SO_SNDBUF
    SO_SNDLOWAT
    SO_SNDTIMEO
    SO_TYPE
    SO_USELOOPBACK
);

sub sockaddr_in {
    if (@_ == 6 && !wantarray) { # perl5.001m compat; use this && die
    my($af, $port, @quad) = @_;
    carp "6-ARG sockaddr_in call is deprecated" if $^W;
    pack_sockaddr_in($port, inet_aton(join('.', @quad)));
    } elsif (wantarray) {
    croak "usage:   (port,iaddr) = sockaddr_in(sin_sv)" unless @_ == 1;
        unpack_sockaddr_in(@_);
    } else {
    croak "usage:   sin_sv = sockaddr_in(port,iaddr))" unless @_ == 2;
        pack_sockaddr_in(@_);
    }
}

sub sockaddr_un {
    if (wantarray) {
    croak "usage:   (filename) = sockaddr_un(sun_sv)" unless @_ == 1;
        unpack_sockaddr_un(@_);
    } else {
    croak "usage:   sun_sv = sockaddr_un(filename)" unless @_ == 1;
        pack_sockaddr_un(@_);
    }
}


sub AUTOLOAD {
    my($constname);
    ($constname = $AUTOLOAD) =~ s/.*:://;
    my $val = constant($constname, @_ ? $_[0] : 0);
    if ($! != 0) {
    if ($! =~ /Invalid/) {
        $AutoLoader::AUTOLOAD = $AUTOLOAD;
        goto &AutoLoader::AUTOLOAD;
    }
    else {
        my ($pack,$file,$line) = caller;
        croak "Your vendor has not defined Socket macro $constname, used";
    }
    }
    eval "sub $AUTOLOAD { $val }";
    goto &$AUTOLOAD;
}

bootstrap Socket $VERSION;

# Preloaded methods go here.  Autoload methods go after __END__, and are
# processed by the autosplit program.

1;
__END__