3 use vars qw($VERSION @ISA @EXPORT);
8 Socket, sockaddr_in, sockaddr_un, inet_aton, inet_ntoa - load the C socket.h defines and structure manipulators
14 $proto = getprotobyname('udp');
15 socket(Socket_Handle, PF_INET, SOCK_DGRAM, $proto);
16 $iaddr = gethostbyname('hishost.com');
17 $port = getservbyname('time', 'udp');
18 $sin = sockaddr_in($port, $iaddr);
19 send(Socket_Handle, 0, 0, $sin);
21 $proto = getprotobyname('tcp');
22 socket(Socket_Handle, PF_INET, SOCK_STREAM, $proto);
23 $port = getservbyname('smtp');
24 $sin = sockaddr_in($port,inet_aton("127.1"));
25 $sin = sockaddr_in(7,inet_aton("localhost"));
26 $sin = sockaddr_in(7,INADDR_LOOPBACK);
27 connect(Socket_Handle,$sin);
29 ($port, $iaddr) = sockaddr_in(getpeername(Socket_Handle));
30 $peer_host = gethostbyaddr($iaddr, AF_INET);
31 $peer_addr = inet_ntoa($iaddr);
33 $proto = getprotobyname('tcp');
34 socket(Socket_Handle, PF_UNIX, SOCK_STREAM, $proto);
36 $sun = sockaddr_un('/tmp/usock');
37 connect(Socket_Handle,$sun);
41 This module is just a translation of the C F<socket.h> file.
42 Unlike the old mechanism of requiring a translated F<socket.ph>
43 file, this uses the B<h2xs> program (see the Perl source distribution)
44 and your native C compiler. This means that it has a
45 far more likely chance of getting the numbers right. This includes
46 all of the commonly used pound-defines like AF_INET, SOCK_STREAM, etc.
48 In addition, some structure manipulation functions are available:
50 =item inet_aton HOSTNAME
52 Takes a string giving the name of a host, and translates that
53 to the 4-byte string (structure). Takes arguments of both
54 the 'rtfm.mit.edu' type and '18.181.0.24'. If the host name
55 cannot be resolved, returns undef. For multi-homed hosts (hosts
56 with more than one address), the first address found is returned.
58 =item inet_ntoa IP_ADDRESS
60 Takes a four byte ip address (as returned by inet_aton())
61 and translates it into a string of the form 'd.d.d.d'
62 where the 'd's are numbers less than 256 (the normal
63 readable four dotted number notation for internet addresses).
67 Note: does not return a number, but a packed string.
69 Returns the 4-byte wildcard ip address which specifies any
70 of the hosts ip addresses. (A particular machine can have
71 more than one ip address, each address corresponding to
72 a particular network interface. This wildcard address
73 allows you to bind to all of them simultaneously.)
74 Normally equivalent to inet_aton('0.0.0.0').
76 =item INADDR_BROADCAST
78 Note: does not return a number, but a packed string.
80 Returns the 4-byte 'this-lan' ip broadcast address.
81 This can be useful for some protocols to solicit information
82 from all servers on the same LAN cable.
83 Normally equivalent to inet_aton('255.255.255.255').
87 Note - does not return a number.
89 Returns the 4-byte loopback address. Normally equivalent
90 to inet_aton('localhost').
94 Note - does not return a number.
96 Returns the 4-byte 'invalid' ip address. Normally equivalent
97 to inet_aton('255.255.255.255').
99 =item sockaddr_in PORT, ADDRESS
101 =item sockaddr_in SOCKADDR_IN
103 In an array context, unpacks its SOCKADDR_IN argument and returns an array
104 consisting of (PORT, ADDRESS). In a scalar context, packs its (PORT,
105 ADDRESS) arguments as a SOCKADDR_IN and returns it. If this is confusing,
106 use pack_sockaddr_in() and unpack_sockaddr_in() explicitly.
108 =item pack_sockaddr_in PORT, IP_ADDRESS
110 Takes two arguments, a port number and a 4 byte IP_ADDRESS (as returned by
111 inet_aton()). Returns the sockaddr_in structure with those arguments
112 packed in with AF_INET filled in. For internet domain sockets, this
113 structure is normally what you need for the arguments in bind(),
114 connect(), and send(), and is also returned by getpeername(),
115 getsockname() and recv().
117 =item unpack_sockaddr_in SOCKADDR_IN
119 Takes a sockaddr_in structure (as returned by pack_sockaddr_in()) and
120 returns an array of two elements: the port and the 4-byte ip-address.
121 Will croak if the structure does not have AF_INET in the right place.
123 =item sockaddr_un PATHNAME
125 =item sockaddr_un SOCKADDR_UN
127 In an array context, unpacks its SOCKADDR_UN argument and returns an array
128 consisting of (PATHNAME). In a scalar context, packs its PATHNAME
129 arguments as a SOCKADDR_UN and returns it. If this is confusing, use
130 pack_sockaddr_un() and unpack_sockaddr_un() explicitly.
131 These are only supported if your system has E<lt>F<sys/un.h>E<gt>.
133 =item pack_sockaddr_un PATH
135 Takes one argument, a pathname. Returns the sockaddr_un structure with
136 that path packed in with AF_UNIX filled in. For unix domain sockets, this
137 structure is normally what you need for the arguments in bind(),
138 connect(), and send(), and is also returned by getpeername(),
139 getsockname() and recv().
141 =item unpack_sockaddr_un SOCKADDR_UN
143 Takes a sockaddr_un structure (as returned by pack_sockaddr_un())
144 and returns the pathname. Will croak if the structure does not
145 have AF_UNIX in the right place.
153 @ISA = qw(Exporter DynaLoader);
155 inet_aton inet_ntoa pack_sockaddr_in unpack_sockaddr_in
156 pack_sockaddr_un unpack_sockaddr_un
157 sockaddr_in sockaddr_un
158 INADDR_ANY INADDR_BROADCAST INADDR_LOOPBACK INADDR_NONE
239 if (@_ == 6 && !wantarray) { # perl5.001m compat; use this && die
240 my($af, $port, @quad) = @_;
241 carp "6-ARG sockaddr_in call is deprecated" if $^W;
242 pack_sockaddr_in($port, inet_aton(join('.', @quad)));
243 } elsif (wantarray) {
244 croak "usage: (port,iaddr) = sockaddr_in(sin_sv)" unless @_ == 1;
245 unpack_sockaddr_in(@_);
247 croak "usage: sin_sv = sockaddr_in(port,iaddr))" unless @_ == 2;
248 pack_sockaddr_in(@_);
254 croak "usage: (filename) = sockaddr_un(sun_sv)" unless @_ == 1;
255 unpack_sockaddr_un(@_);
257 croak "usage: sun_sv = sockaddr_un(filename)" unless @_ == 1;
258 pack_sockaddr_un(@_);
265 ($constname = $AUTOLOAD) =~ s/.*:://;
266 my $val = constant($constname, @_ ? $_[0] : 0);
268 my ($pack,$file,$line) = caller;
269 croak "Your vendor has not defined Socket macro $constname, used";
271 eval "sub $AUTOLOAD { $val }";
275 bootstrap Socket $VERSION;