#!/bin/sh
# dyndns via ssh login + tinydns (djbdns/dbndns)
#
# usage:
# $ ssh dyndns@example.org home.example.org
#
# @author Christian Weiske <cweiske@cweiske.de>

if [ -z "$SSH_CONNECTION" ]; then
   echo "no ssh connection"
   exit 1
fi

remoteip=${SSH_CLIENT%% *}
if [ -z "$remoteip" ]; then
   echo "ssh client IP not found"
   exit 2
fi

if [ -z "$2" ]; then
    echo Missing argument: domain name
    exit 3
fi
domain="$2"

#load config files
if [ -f ~/.config/ssh-dyndns.sh ]; then
    . ~/.config/ssh-dyndns.sh
fi
if [ -f /etc/ssh-dyndns.sh ]; then
    . /etc/ssh-dyndns.sh
fi

if [ -z "$data_dir" ]; then
    echo '$data_dir not set'
    exit 4
fi
if [ ! -d "$data_dir" ]; then
    echo "$data_dir does not exist"
    exit 5
fi
if [ ! -f "$data_dir/Makefile" ]; then
    echo "$data_dir misses Makefile"
    exit 6
fi

#FIXME: check allowed domains, allowed suffixes

file_pattern="${file_pattern:-data-dyndns-%DOMAIN%}"
timeout=${timeout:-300}

datafile=${data_dir}`echo $file_pattern | sed "s/%DOMAIN%/$domain/"`
#echo $datafile

if [ `echo "$remoteip"| sed "s/://"` != "$remoteip" ]; then
    echo "IPv6 not supported yet"
    # we need ipv6 address expansion
    exit 7
fi

#=cweiske.de:5.35.241.22
djbdnsline="=${domain}:${remoteip}:${timeout}"
echo $djbdnsline > $datafile

#compile dns data
cd "$data_dir"
make