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.\" ========================================================================
.\"
.IX Title "Net::hostent 3"
.TH Net::hostent 3 "2019-10-24" "perl v5.30.2" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Net::hostent \- by\-name interface to Perl's built\-in gethost*() functions
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& use Net::hostent;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module's default exports override the core \fBgethostbyname()\fR and
\&\fBgethostbyaddr()\fR functions, replacing them with versions that return
\&\*(L"Net::hostent\*(R" objects. This object has methods that return the similarly
named structure field name from the C's hostent structure from \fInetdb.h\fR;
namely name, aliases, addrtype, length, and addr_list. The aliases and
addr_list methods return array reference, the rest scalars. The addr
method is equivalent to the zeroth element in the addr_list array
reference.
.PP
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 \f(CW\*(C`h_\*(C'\fR. Thus, \f(CW\*(C`$host_obj\->name()\*(C'\fR corresponds to
\&\f(CW$h_name\fR if you import the fields. Array references are available as
regular array variables, so for example \f(CW\*(C`@{ $host_obj\->aliases()
}\*(C'\fR would be simply \f(CW@h_aliases\fR.
.PP
The \fBgethost()\fR function is a simple front-end that forwards a numeric
argument to \fBgethostbyaddr()\fR by way of Socket::inet_aton, and the rest
to \fBgethostbyname()\fR.
.PP
To access this functionality without the core overrides,
pass the \f(CW\*(C`use\*(C'\fR 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 \f(CW\*(C`CORE::\*(C'\fR pseudo-package.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
.Vb 2
\& use Net::hostent;
\& use Socket;
\&
\& @ARGV = (\*(Aqnetscape.com\*(Aq) unless @ARGV;
\&
\& for $host ( @ARGV ) {
\&
\& unless ($h = gethost($host)) {
\& warn "$0: no such host: $host\en";
\& next;
\& }
\&
\& printf "\en%s is %s%s\en",
\& $host,
\& lc($h\->name) eq lc($host) ? "" : "*really* ",
\& $h\->name;
\&
\& print "\etaliases are ", join(", ", @{$h\->aliases}), "\en"
\& if @{$h\->aliases};
\&
\& if ( @{$h\->addr_list} > 1 ) {
\& my $i;
\& for $addr ( @{$h\->addr_list} ) {
\& printf "\etaddr #%d is [%s]\en", $i++, inet_ntoa($addr);
\& }
\& } else {
\& printf "\etaddress is [%s]\en", inet_ntoa($h\->addr);
\& }
\&
\& if ($h = gethostbyaddr($h\->addr)) {
\& if (lc($h\->name) ne lc($host)) {
\& printf "\etThat addr reverses to host %s!\en", $h\->name;
\& $host = $h\->name;
\& redo;
\& }
\& }
\& }
.Ve
.SH "NOTE"
.IX Header "NOTE"
While this class is currently implemented using the Class::Struct
module to build a struct-like class, you shouldn't rely upon this.
.SH "AUTHOR"
.IX Header "AUTHOR"
Tom Christiansen