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IO::Socket::INET(3pm) Perl Programmers Reference Guide IO::Socket::INET(3pm)

NAME

IO::Socket::INET - Object interface for AFINET domain sockets

SYNOPSIS

use IO::Socket::INET;

DESCRIPTION

"IO::Socket::INET" provides an object interface to creating and using

sockets in the AFINET domain. It is built upon the IO::Socket inter-

face and inherits all the methods defined by IO::Socket. CCOONNSSTTRRUUCCTTOORR new ( [ARGS] )

Creates an "IO::Socket::INET" object, which is a reference to a

newly created symbol (see the "Symbol" package). "new" optionally

takes arguments, these arguments are in key-value pairs.

In addition to the key-value pairs accepted by IO::Socket,

"IO::Socket::INET" provides.

PeerAddr Remote host address [:] PeerHost Synonym for PeerAddr PeerPort Remote port or service [()] | LocalAddr Local host bind address hostname[:port] LocalHost Synonym for LocalAddr LocalPort Local host bind port [()] | Proto Protocol name (or number) "tcp" | "udp" | ... Type Socket type SOCKSTREAM | SOCKDGRAM | ... Listen Queue size for listen ReuseAddr Set SOREUSEADDR before binding Reuse Set SOREUSEADDR before binding (deprecated, prefer ReuseAddr) ReusePort Set SOREUSEPORT before binding Broadcast Set SOBROADCAST 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 "Listen" is defined then a listen socket is created, else if the socket type, which is derived from the protocol, is SOCKSTREAM then connect() is called. Although it is not illegal, the use of "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 "PeerAddr" can be a hostname or the IP-address on the

"xx.xx.xx.xx" form. The "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 sys-

tem. The "PeerPort" specification can also be embedded in the "PeerAddr" by preceding it with a ":". If "Proto" is not given and you specify a symbolic "PeerPort" port, then the constructor will try to derive "Proto" from the service name. As a last resort "Proto" "tcp" is assumed. The "Type" parameter will be deduced from "Proto" if not specified. If the constructor is only passed a single argument, it is assumed to be a "PeerAddr" specification. If "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 => inetntoa(INADDRBROADCAST), Proto => udp, LocalAddr => 'localhost', Broadcast => 1 )

or die "Can't bind : $@\n";

NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE

As of VERSION 1.18 all IO::Socket objects have autoflush turned on by default. This was not the case with earlier releases.

NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE

MMEETTHHOODDSS sockaddr () Return the address part of the sockaddr structure for the socket sockport () Return the port number that the socket is using on the local host sockhost () Return the address part of the sockaddr structure for the socket in a text form xx.xx.xx.xx peeraddr () Return the address part of the sockaddr structure for the socket on the peer host peerport () Return the port number for the socket on the peer host. peerhost () Return the address part of the sockaddr structure for the socket on the peer host in a text form xx.xx.xx.xx