6 our(@EXPORT, @EXPORT_OK, %EXPORT_TAGS);
9 @EXPORT = qw(gethostbyname gethostbyaddr gethost);
15 %EXPORT_TAGS = ( FIELDS => [ @EXPORT_OK, @EXPORT ] );
19 # Class::Struct forbids use of @ISA
20 sub import { goto &Exporter::import }
22 use Class::Struct qw(struct);
23 struct 'Net::hostent' => [
31 sub addr { shift->addr_list->[0] }
36 $h_name = $hob->[0] = $_[0];
37 @h_aliases = @{ $hob->[1] } = split ' ', $_[1];
38 $h_addrtype = $hob->[2] = $_[2];
39 $h_length = $hob->[3] = $_[3];
41 @h_addr_list = @{ $hob->[4] } = @_[ (4 .. $#_) ];
45 sub gethostbyname ($) { populate(CORE::gethostbyname(shift)) }
47 sub gethostbyaddr ($;$) {
48 my ($addr, $addrtype);
50 require Socket unless @_;
51 $addrtype = @_ ? shift : Socket::AF_INET();
52 populate(CORE::gethostbyaddr($addr, $addrtype))
56 if ($_[0] =~ /^\d+(?:\.\d+(?:\.\d+(?:\.\d+)?)?)?$/) {
58 &gethostbyaddr(Socket::inet_aton(shift));
69 Net::hostent - by-name interface to Perl's built-in gethost*() functions
77 This module's default exports override the core gethostbyname() and
78 gethostbyaddr() functions, replacing them with versions that return
79 "Net::hostent" objects. This object has methods that return the similarly
80 named structure field name from the C's hostent structure from F<netdb.h>;
81 namely name, aliases, addrtype, length, and addr_list. The aliases and
82 addr_list methods return array reference, the rest scalars. The addr
83 method is equivalent to the zeroth element in the addr_list array
86 You may also import all the structure fields directly into your namespace
87 as regular variables using the :FIELDS import tag. (Note that this still
88 overrides your core functions.) Access these fields as variables named
89 with a preceding C<h_>. Thus, C<$host_obj-E<gt>name()> corresponds to
90 $h_name if you import the fields. Array references are available as
91 regular array variables, so for example C<@{ $host_obj-E<gt>aliases()
92 }> would be simply @h_aliases.
94 The gethost() function is a simple front-end that forwards a numeric
95 argument to gethostbyaddr() by way of Socket::inet_aton, and the rest
98 To access this functionality without the core overrides,
99 pass the C<use> an empty import list, and then access
100 function functions with their full qualified names.
101 On the other hand, the built-ins are still available
102 via the C<CORE::> pseudo-package.
109 @ARGV = ('netscape.com') unless @ARGV;
111 for $host ( @ARGV ) {
113 unless ($h = gethost($host)) {
114 warn "$0: no such host: $host\n";
118 printf "\n%s is %s%s\n",
120 lc($h->name) eq lc($host) ? "" : "*really* ",
123 print "\taliases are ", join(", ", @{$h->aliases}), "\n"
126 if ( @{$h->addr_list} > 1 ) {
128 for $addr ( @{$h->addr_list} ) {
129 printf "\taddr #%d is [%s]\n", $i++, inet_ntoa($addr);
132 printf "\taddress is [%s]\n", inet_ntoa($h->addr);
135 if ($h = gethostbyaddr($h->addr)) {
136 if (lc($h->name) ne lc($host)) {
137 printf "\tThat addr reverses to host %s!\n", $h->name;
146 While this class is currently implemented using the Class::Struct
147 module to build a struct-like class, you shouldn't rely upon this.