Socket, sockaddr_in, sockaddr_un, inet_aton, inet_ntoa - load the C socket.h defines and structure manipulators
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);
This module is just a translation of the C socket.h file. Unlike the old mechanism of requiring a translated socket.ph file, this uses the 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 CR, LF, and CRLF, as well as $CR, $LF, and
$CRLF, which map to \015, \012, and \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 :crlf export tag:
use Socket qw(:DEFAULT :crlf);
In addition, some structure manipulation functions are available:
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.
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).
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').
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').
Note - does not return a number.
Returns the 4-byte loopback address. Normally equivalent to
inet_aton('localhost').
Note - does not return a number.
Returns the 4-byte 'invalid' ip address. Normally equivalent to
inet_aton('255.255.255.255').
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.
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().
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.
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 <sys/un.h>.
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().
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.