Chip 2000 May/Chip_2000-05_cd1.bin/zkuste/Perl/ActivePerl-5.6.0.613.msi/䆊䌷䈹䈙䏵-䞅䞆䞀㡆䞃䄦䠥/_ec2e0890759aa499822887c0cd708289

Text File | 2000-03-15 | 10.7 KB | 453 lines

package Socket;

our($VERSION, @ISA, @EXPORT, @EXPORT_OK, %EXPORT_TAGS);
$VERSION = "1.72";

=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', 'tcp');
    $sin = sockaddr_in($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.

Also, some common socket "newline" constants are provided: the
constants C<CR>, C<LF>, and C<CRLF>, as well as C<$CR>, C<$LF>, and
C<$CRLF>, which map to C<\015>, C<\012>, and C<\015\012>.  If you do
not want to use the literal characters in your programs, then use
the constants provided here.  They are not exported by default, but can
be imported individually, and with the C<:crlf> export tag:

    use Socket qw(:DEFAULT :crlf);

In addition, some structure manipulation functions are available:

=over

=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. For multi-homed hosts (hosts
with more than one address), the first address found is returned.

=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_BROADCAST

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

Returns the 4-byte 'this-lan' ip broadcast address.
This can be useful for some protocols to solicit information
from all servers on the same LAN cable.
Normally equivalent to inet_aton('255.255.255.255').

=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 PATHNAME
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 E<lt>F<sys/un.h>E<gt>.

=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.

=back

=cut

use Carp;
use warnings::register;

require Exporter;
use XSLoader ();
@ISA = qw(Exporter);
@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_BROADCAST 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
    IOV_MAX
    MSG_BCAST
    MSG_CTLFLAGS
    MSG_CTLIGNORE
    MSG_CTRUNC
    MSG_DONTROUTE
    MSG_DONTWAIT
    MSG_EOF
    MSG_EOR
    MSG_ERRQUEUE
    MSG_FIN
    MSG_MAXIOVLEN
    MSG_MCAST
    MSG_NOSIGNAL
    MSG_OOB
    MSG_PEEK
    MSG_PROXY
    MSG_RST
    MSG_SYN
    MSG_TRUNC
    MSG_URG
    MSG_WAITALL
    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
    SCM_CONNECT
    SCM_CREDENTIALS
    SCM_CREDS
    SCM_RIGHTS
    SCM_TIMESTAMP
    SHUT_RD
    SHUT_RDWR
    SHUT_WR
    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
    UIO_MAXIOV
);

@EXPORT_OK = qw(CR LF CRLF $CR $LF $CRLF

           IPPROTO_TCP
           TCP_KEEPALIVE
           TCP_MAXRT
           TCP_MAXSEG
           TCP_NODELAY
           TCP_STDURG);

%EXPORT_TAGS = (
    crlf    => [qw(CR LF CRLF $CR $LF $CRLF)],
    all     => [@EXPORT, @EXPORT_OK],
);

BEGIN {
    sub CR   () {"\015"}
    sub LF   () {"\012"}
    sub CRLF () {"\015\012"}
}

*CR   = \CR();
*LF   = \LF();
*CRLF = \CRLF();

sub sockaddr_in {
    if (@_ == 6 && !wantarray) { # perl5.001m compat; use this && die
    my($af, $port, @quad) = @_;
    warnings::warn "6-ARG sockaddr_in call is deprecated"
        if warnings::enabled();
    pack_sockaddr_in($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 INADDR_ANY         ();
sub INADDR_BROADCAST    ();
sub INADDR_LOOPBACK    ();
sub INADDR_LOOPBACK    ();

sub AF_802        ();
sub AF_APPLETALK    ();
sub AF_CCITT        ();
sub AF_CHAOS        ();
sub AF_DATAKIT        ();
sub AF_DECnet        ();
sub AF_DLI        ();
sub AF_ECMA        ();
sub AF_GOSIP        ();
sub AF_HYLINK        ();
sub AF_IMPLINK        ();
sub AF_INET        ();
sub AF_LAT        ();
sub AF_MAX        ();
sub AF_NBS        ();
sub AF_NIT        ();
sub AF_NS        ();
sub AF_OSI        ();
sub AF_OSINET        ();
sub AF_PUP        ();
sub AF_SNA        ();
sub AF_UNIX        ();
sub AF_UNSPEC        ();
sub AF_X25        ();
sub IOV_MAX        ();
sub MSG_BCAST        ();
sub MSG_CTLFLAGS    ();
sub MSG_CTLIGNORE    ();
sub MSG_CTRUNC        ();
sub MSG_DONTROUTE    ();
sub MSG_DONTWAIT    ();
sub MSG_EOF        ();
sub MSG_EOR        ();
sub MSG_ERRQUEUE    ();
sub MSG_FIN        ();
sub MSG_MAXIOVLEN    ();
sub MSG_MCAST        ();
sub MSG_NOSIGNAL    ();
sub MSG_OOB        ();
sub MSG_PEEK        ();
sub MSG_PROXY        ();
sub MSG_RST        ();
sub MSG_SYN        ();
sub MSG_TRUNC        ();
sub MSG_URG        ();
sub MSG_WAITALL        ();
sub PF_802        ();
sub PF_APPLETALK    ();
sub PF_CCITT        ();
sub PF_CHAOS        ();
sub PF_DATAKIT        ();
sub PF_DECnet        ();
sub PF_DLI        ();
sub PF_ECMA        ();
sub PF_GOSIP        ();
sub PF_HYLINK        ();
sub PF_IMPLINK        ();
sub PF_INET        ();
sub PF_LAT        ();
sub PF_MAX        ();
sub PF_NBS        ();
sub PF_NIT        ();
sub PF_NS        ();
sub PF_OSI        ();
sub PF_OSINET        ();
sub PF_PUP        ();
sub PF_SNA        ();
sub PF_UNIX        ();
sub PF_UNSPEC        ();
sub PF_X25        ();
sub SCM_CONNECT        ();
sub SCM_CREDENTIALS    ();
sub SCM_CREDS        ();
sub SCM_RIGHTS        ();
sub SCM_TIMESTAMP    ();
sub SHUT_RD        ();
sub SHUT_RDWR        ();
sub SHUT_WR        ();
sub SOCK_DGRAM        ();
sub SOCK_RAW        ();
sub SOCK_RDM        ();
sub SOCK_SEQPACKET    ();
sub SOCK_STREAM        ();
sub SOL_SOCKET        ();
sub SOMAXCONN        ();
sub SO_ACCEPTCONN    ();
sub SO_BROADCAST    ();
sub SO_DEBUG        ();
sub SO_DONTLINGER    ();
sub SO_DONTROUTE    ();
sub SO_ERROR        ();
sub SO_KEEPALIVE    ();
sub SO_LINGER        ();
sub SO_OOBINLINE    ();
sub SO_RCVBUF        ();
sub SO_RCVLOWAT        ();
sub SO_RCVTIMEO        ();
sub SO_REUSEADDR    ();
sub SO_SNDBUF        ();
sub SO_SNDLOWAT        ();
sub SO_SNDTIMEO        ();
sub SO_TYPE        ();
sub SO_USELOOPBACK    ();
sub UIO_MAXIOV        ();

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

XSLoader::load 'Socket', $VERSION;

1;