Net::netent
See the current Perl documentation for Net::netent.
Here is our local, out-dated (pre-5.6) version:
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;
$n = getnetbyname("loopback&qu
This module's default exports override the core
getnetbyname()
andgetnetbyaddr()
functions, replacing them with versions that return ``Net::netent'' objects. This object has methods that return the similarly named structure field name from the C's netent structure from netdb.h; namely name, aliases, addrtype, and net. The aliases method returns an array reference, the rest scalars.You may also import all the structure fields directly into your namespace as regular variables using the :FIELDS import tag. (Note that this still overrides your core functions.) Access these fields as variables named with a preceding
n_
. Thus,$net_obj->name()
corresponds to$n_name
if you import the fields. Array references are available as regular array variables, so for example@{ $net_obj->aliases() }
would be simply @n_aliases.The
getnet()
funtion is a simple front-end that forwards a numeric argument togetnetbyaddr(),
and the rest togetnetbyname().
To access this functionality without the core overrides, pass the use an empty import list, and then access function functions with their full qualified names. On the other hand, the built-ins are still available via the
CORE::
pseudo-package.
EXAMPLES
The
getnet()
functions do this in the Perl core:
sv_setiv(sv, (I32)nent->n_net);The
gethost()
functions do this in the Perl core:
sv_setpvn(sv, hent->h_addr, len);That means that the address comes back in binary for the host functions, and as a regular perl integer for the net ones. This seems a bug, but here's how to deal with it:
use strict; use Socket; use Net::netent; @ARGV = ('loopback') unless @ARGV; my($n, $net); for $net ( @ARGV ) { unless ($n = getnetbyname($net)) { warn "$0: no such net: $net\n"; next; } printf "\n%s is %s%s\n", $net, lc($n->name) eq lc($net) ? "" : "*really* ", $n->name; print "\taliases are ", join(", ", @{$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; redo; } } }
NOTE
While this class is currently implemented using the Class::Struct module to build a struct-like class, you shouldn't rely upon this.
AUTHOR
Tom Christiansen