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RedHat 9 (Linux i386) - man page for net::netent (redhat section 3pm)

Net::netent(3pm)		 Perl Programmers Reference Guide		 Net::netent(3pm)

       Net::netent - by-name interface to Perl's built-in getnet*() functions

	use Net::netent qw(:FIELDS);
	getnetbyname("loopback")	       or die "bad net";
	printf "%s is %08X\n", $n_name, $n_net;

	use Net::netent;

	$n = getnetbyname("loopback")	       or die "bad net";
	{ # there's gotta be a better way, eh?
	    @bytes = unpack("C4", pack("N", $n->net));
	    shift @bytes while @bytes && $bytes[0] == 0;
	printf "%s is %08X [%d.%d.%d.%d]\n", $n->name, $n->net, @bytes;

       This module's default exports override the core getnetbyname() and getnetbyaddr() func-
       tions, replacing them with versions that return "Net::netent" objects.  This object has
       methods that return the similarly named structure field name from the C's netent structure
       from netdb.h; namely name, aliases, addrtype, and net.  The aliases method returns an
       array reference, the rest scalars.

       You may also import all the structure fields directly into your namespace as regular vari-
       ables using the :FIELDS import tag.  (Note that this still overrides your core functions.)
       Access these fields as variables named with a preceding "n_".  Thus, "$net_obj->name()"
       corresponds to $n_name if you import the fields.  Array references are available as regu-
       lar array variables, so for example "@{ $net_obj->aliases() }" would be simply @n_aliases.

       The getnet() function is a simple front-end that forwards a numeric argument to getnet-
       byaddr(), and the rest to getnetbyname().

       To access this functionality without the core overrides, pass the "use" an empty import
       list, and then access function functions with their full qualified names.  On the other
       hand, the built-ins are still available via the "CORE::" pseudo-package.

       The getnet() functions do this in the Perl core:

	   sv_setiv(sv, (I32)nent->n_net);

       The gethost() functions do this in the Perl core:

	   sv_setpvn(sv, hent->h_addr, len);

       That means that the address comes back in binary for the host functions, and as a regular
       perl integer for the net ones.  This seems a bug, but here's how to deal with it:

	use strict;
	use Socket;
	use Net::netent;

	@ARGV = ('loopback') unless @ARGV;

	my($n, $net);

	for $net ( @ARGV ) {

	    unless ($n = getnetbyname($net)) {
	       warn "$0: no such net: $net\n";

	    printf "\n%s is %s%s\n",
		   lc($n->name) eq lc($net) ? "" : "*really* ",

	    print "\taliases are ", join(", ", @{$n->aliases}), "\n"
		       if @{$n->aliases};

	    # this is stupid; first, why is this not in binary?
	    # second, why am i going through these convolutions
	    # to make it looks right
	       my @a = unpack("C4", pack("N", $n->net));
	       shift @a while @a && $a[0] == 0;
	       printf "\taddr is %s [%d.%d.%d.%d]\n", $n->net, @a;

	    if ($n = getnetbyaddr($n->net)) {
	       if (lc($n->name) ne lc($net)) {
		   printf "\tThat addr reverses to net %s!\n", $n->name;
		   $net = $n->name;

       While this class is currently implemented using the Class::Struct module to build a
       struct-like class, you shouldn't rely upon this.

       Tom Christiansen

perl v5.8.0				    2002-06-01				 Net::netent(3pm)

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