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#!/usr/bin/perl
#
# afraid-dyndns - a Dynamic DNS client for the afraid.org free service
# Copyright (C) 2009 Erick Calder
# Copyright (C) 2012 ultraviolet
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
$|++;
$\ = $/;
use LWP::Simple;
use XML::Simple;
# use Data::Dumper;
use Getopt::Long;
Getopt::Long::Configure("no_ignore_case");
$args{"quiet"} = "Suppresses normal output";
$args{"help"} = "Display syntax";
GetOptions(\%ARGV, keys %args);
if ($ARGV{help}) { # output of afraid-dyndns-uv --help
echo("Syntax: $0 [--quiet] [--help] [hostname]");
echo(" quiet: supresses all output");
echo(" help: displays syntax");
echo(" hostname: indicates that only the specified name should be refreshed");
exit;
}
# afraid.org listing of urls
$afraid = "http://freedns.afraid.org/api/?action=getdyndns&sha=%s&style=xml";
$CACHEDIR = "/var/cache/afraid-dyndns/IP"; # set cache directory
$HASH = "<your_hash>"; # account hash for authentication
($ME = $0) =~ s|.*/||; # set $ME/$0 to our PID
$hostname = shift;
echo("Original script by Erick Calder, this fork by ultraviolet");
echo("License: GPL");
#
# get external and cached IP addresses
#
$extip = get("http://api.externalip.net/ip/"); # Fetch current IP from whatismyip
die "Failed to get IP" unless $extip; # If IP wasn't acquired, go poof
$intip = readfile($CACHEDIR); # internal address (cached)
chomp $intip;
echo("Read $intip as cached IP, $extip is the new one, if applicable");
#
# when these differ modify the DNS and cache the address
#
if ($extip eq $intip) { # check if the new IP and the current IP are the same
echo("No change in address!");
} else {
echo("Address changed: $intip => $extip");
$xml = get(sprintf($afraid, $HASH));
die "Failed fetching update head!" unless $xml;
$o = XMLin($xml);
writefile($CACHEDIR, $extip);
}
exit;
#
# Syntax:
# readfile [file-name = $_]
# <scalar> = readfile [file-name = $_]
# <list> = readfile [file-name = $_]
# Synopsis:
# returns the contents of a given file. if called in a void
# context, this function sets $_; if called in a scalar context
# the contents are returned as a single string with embedded
# newlines; and if called in a list context the content comes
# back as separate lines.
#
sub readfile {
my $f = shift || $_;
local $_ if defined wantarray();
-f $f || return;
open(F, $f) || warn($!) && return;
wantarray() && (@_ = <F>) || (local $/ = undef, $_ = <F>);
close(F);
wantarray() ? @_ : $_;
}
#
# Syntax:
# writefile <file-name> [content = $_]
# Synopsis:
# writes a string to a file, returns success/failure
#
sub writefile($@) {
my $fn = shift;
local $_ = shift || $_ || return;
print ">> writefile(): $fn" if $::DEBUG;
mkpath(path2fn($fn));
open(OUT, "> $fn") || warn(qq|writefile("> $fn"): "$!"|) && return;
print OUT;
close(OUT) || return;
return 1;
}
#
# could've used system("mkdir -p") but
# that won't work on Win32 systems
#
sub mkpath {
local $_ = shift;
my @d = split m(/);
my $d = "";
my $mkpath = 0;
for (@d) {
$d .= "$_/";
next if -d $d; # skip if it already exists
print "- $d" if $::DEBUG > 1;
mkdir($d) || warn(qq/mkdir("$d"): "$!"/) && return;
$mkpath = 1;
}
return 1;
}
#
# splits a path into directory, filename and extension
# e.g. ($dir, $fn, $ext) = path2fn($path)
#
sub path2fn {
my $path = shift;
my ($dir, $fn, $ext);
@x = split(/\//, $path);
$fn = pop @x;
$dir = join("/", @x);
@x = split(/\./, $fn);
if (@x > 1) {
$ext = pop @x;
$fn = join(".", @x);
}
return ($dir, $fn, $ext);
}
#
# output functions
#
sub debug {
print shift if $ARGV{debug} && !$ARGV{quiet};
}
sub echo {
print shift || $_ unless $ARGV{quiet};
}
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