inet_ntoa - load the C socket.h defines and structure manipulators |
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:
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).
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').
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').
Returns the 4-byte loopback address. Normally equivalent to inet_aton('localhost').
Returns the 4-byte 'invalid' ip address. Normally equivalent to inet_aton('255.255.255.255').
pack_sockaddr_in()
and unpack_sockaddr_in()
explicitly.
getsockname()
and recv().
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.
pack_sockaddr_un()
and unpack_sockaddr_un()
explicitly.
These are only supported if your system has <sys/un.h>.
getsockname()
and recv().
pack_sockaddr_un())
and returns the pathname. Will croak if the structure does not
have AF_UNIX in the right place.
inet_ntoa - load the C socket.h defines and structure manipulators |