1IO::Socket::INET(3pm)  Perl Programmers Reference Guide  IO::Socket::INET(3pm)
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NAME

6       IO::Socket::INET - Object interface for AF_INET domain sockets
7

SYNOPSIS

9           use IO::Socket::INET;
10

DESCRIPTION

12       "IO::Socket::INET" provides an object interface to creating and using
13       sockets in the AF_INET domain. It is built upon the IO::Socket
14       interface and inherits all the methods defined by IO::Socket.
15

CONSTRUCTOR

17       new ( [ARGS] )
18           Creates an "IO::Socket::INET" object, which is a reference to a
19           newly created symbol (see the "Symbol" package). "new" optionally
20           takes arguments, these arguments are in key-value pairs.
21
22           In addition to the key-value pairs accepted by IO::Socket,
23           "IO::Socket::INET" provides.
24
25            PeerAddr    Remote host address          <hostname>[:<port>]
26            PeerHost    Synonym for PeerAddr
27            PeerPort    Remote port or service       <service>[(<no>)] | <no>
28            LocalAddr   Local host bind address      hostname[:port]
29            LocalHost   Synonym for LocalAddr
30            LocalPort   Local host bind port         <service>[(<no>)] | <no>
31            Proto       Protocol name (or number)    "tcp" | "udp" | ...
32            Type        Socket type              SOCK_STREAM | SOCK_DGRAM | ...
33            Listen      Queue size for listen
34            ReuseAddr   Set SO_REUSEADDR before binding
35            Reuse       Set SO_REUSEADDR before binding (deprecated,
36                                                         prefer ReuseAddr)
37            ReusePort   Set SO_REUSEPORT before binding
38            Broadcast   Set SO_BROADCAST before binding
39            Timeout     Timeout value for various operations
40            MultiHomed  Try all addresses for multi-homed hosts
41            Blocking    Determine if connection will be blocking mode
42
43           If "Listen" is defined then a listen socket is created, else if the
44           socket type, which is derived from the protocol, is SOCK_STREAM
45           then connect() is called.  If the "Listen" argument is given, but
46           false, the queue size will be set to 5.
47
48           Although it is not illegal, the use of "MultiHomed" on a socket
49           which is in non-blocking mode is of little use. This is because the
50           first connect will never fail with a timeout as the connect call
51           will not block.
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53           The "PeerAddr" can be a hostname or the IP-address on the
54           "xx.xx.xx.xx" form.  The "PeerPort" can be a number or a symbolic
55           service name.  The service name might be followed by a number in
56           parenthesis which is used if the service is not known by the
57           system.  The "PeerPort" specification can also be embedded in the
58           "PeerAddr" by preceding it with a ":".
59
60           If "Proto" is not given and you specify a symbolic "PeerPort" port,
61           then the constructor will try to derive "Proto" from the service
62           name.  As a last resort "Proto" "tcp" is assumed.  The "Type"
63           parameter will be deduced from "Proto" if not specified.
64
65           If the constructor is only passed a single argument, it is assumed
66           to be a "PeerAddr" specification.
67
68           If "Blocking" is set to 0, the connection will be in nonblocking
69           mode.  If not specified it defaults to 1 (blocking mode).
70
71           Examples:
72
73              $sock = IO::Socket::INET->new(PeerAddr => 'www.perl.org',
74                                            PeerPort => 'http(80)',
75                                            Proto    => 'tcp');
76
77              $sock = IO::Socket::INET->new(PeerAddr => 'localhost:smtp(25)');
78
79              $sock = IO::Socket::INET->new(Listen    => 5,
80                                            LocalAddr => 'localhost',
81                                            LocalPort => 9000,
82                                            Proto     => 'tcp');
83
84              $sock = IO::Socket::INET->new('127.0.0.1:25');
85
86              $sock = IO::Socket::INET->new(
87                                      PeerPort  => 9999,
88                                      PeerAddr  => inet_ntoa(INADDR_BROADCAST),
89                                      Proto     => udp,
90                                      LocalAddr => 'localhost',
91                                      Broadcast => 1 )
92                                  or die "Can't bind : $IO::Socket::errstr\n";
93
94           If the constructor fails it will return "undef" and set the
95           $IO::Socket::errstr package variable to contain an error message.
96
97               $sock = IO::Socket::INET->new(...)
98                   or die "Cannot create socket - $IO::Socket::errstr\n";
99
100           For legacy reasons the error message is also set into the global $@
101           variable, and you may still find older code which looks here
102           instead.
103
104               $sock = IO::Socket::INET->new(...)
105                   or die "Cannot create socket - $@\n";
106
107   METHODS
108       sockaddr ()
109           Return the address part of the sockaddr structure for the socket
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111       sockport ()
112           Return the port number that the socket is using on the local host
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114       sockhost ()
115           Return the address part of the sockaddr structure for the socket in
116           a text form xx.xx.xx.xx
117
118       peeraddr ()
119           Return the address part of the sockaddr structure for the socket on
120           the peer host
121
122       peerport ()
123           Return the port number for the socket on the peer host.
124
125       peerhost ()
126           Return the address part of the sockaddr structure for the socket on
127           the peer host in a text form xx.xx.xx.xx
128

SEE ALSO

130       Socket, IO::Socket
131

AUTHOR

133       Graham Barr. Currently maintained by the Perl Porters.  Please report
134       all bugs to <perlbug@perl.org>.
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137       Copyright (c) 1996-8 Graham Barr <gbarr@pobox.com>. All rights
138       reserved.  This program is free software; you can redistribute it
139       and/or modify it under the same terms as Perl itself.
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143perl v5.34.0                      2021-10-18             IO::Socket::INET(3pm)
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