In addition to the key-value pairs accepted by IO::Socket, "IO::Socket::INET6" provides.
Domain Address family AF_INET | AF_INET6 | AF_UNSPEC (default) PeerAddr Remote host address <hostname>[:<port>] PeerHost Synonym for PeerAddr PeerPort Remote port or service <service>[(<no>)] | <no> PeerFlow Remote flow information PeerScope Remote address scope LocalAddr Local host bind address hostname[:port] LocalHost Synonym for LocalAddr LocalPort Local host bind port <service>[(<no>)] | <no> LocalFlow Local host flow information LocalScope Local host address scope Proto Protocol name (or number) "tcp" | "udp" | ... Type Socket type SOCK_STREAM | SOCK_DGRAM | ... Listen Queue size for listen ReuseAddr Set SO_REUSEADDR before binding Reuse Set SO_REUSEADDR before binding (deprecated, prefer ReuseAddr) ReusePort Set SO_REUSEPORT before binding Broadcast Set SO_BROADCAST 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 SOCK_STREAM 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, the IPv6-address on the ``2001:800:40:2a05::10'' form , or the IPv4-address on the ``126.96.36.199'' 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 system. The "PeerPort" specification can also be embedded in the "PeerAddr" by preceding it with a ``:'', and closing the IPv6 address on brackets ``'' if necessary: ``124.678.12.34:23'',``[2a05:345f::10]:23'',``any.server.com:23''.
If "Domain" is not given, AF_UNSPEC is assumed, that is, both AF_INET and AF_INET6 will be both considered when resolving DNS names. AF_INET6 has priority. If you guess you are in trouble not reaching the peer,(the service is not available via AF_INET6 but AF_INET) you can either try Multihomed (try any address/family until reach) or concrete your address "family" (AF_INET, AF_INET6).
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).
$sock = IO::Socket::INET6->new(PeerAddr => 'www.perl.org', PeerPort => 'http(80)', Proto => 'tcp');
Suppose either you have no IPv6 connectivity or www.perl.org has no http service on IPv6. Then,
(Trying all address/families until reach)
$sock = IO::Socket::INET6->new(PeerAddr => 'www.perl.org', PeerPort => 'http(80)', Multihomed => 1 , Proto => 'tcp');
(Concrete to IPv4 protocol)
$sock = IO::Socket::INET6->new(PeerAddr => 'www.perl.org', PeerPort => 'http(80)', Domain => AF_INET , Proto => 'tcp'); $sock = IO::Socket::INET6->new(PeerAddr => 'localhost:smtp(25)'); $sock = IO::Socket::INET6->new(Listen => 5, LocalAddr => 'localhost', LocalPort => 9000, Proto => 'tcp'); $sock = IO::Socket::INET6->new('[::1]:25'); $sock = IO::Socket::INET6->new(PeerPort => 9999, PeerAddr => Socket6::inet_ntop(AF_INET6,in6addr_broadcast), 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
Modified by Rafael Martinez Torres <firstname.lastname@example.org> and Euro6IX project.
Modified further by Shlomi Fish <email@example.com>, while disclaiming all copyrights.
Copyright (c) 2003- Euro6IX project.
Copyright (c) 1996-8 Graham Barr <firstname.lastname@example.org>.
All rights reserved.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.