#!/bin/bash
#
# .---.                  .              .
# |                      |              |
# |--- .--. .-.  .-.  .-.|  .-. .--.--. |.-.  .-. .--.  .-.
# |    |   (.-' (.-' (   | (   )|  |  | |   )(   )|  | (.-'
# '    '     --'  --'  -' -  -' '  '   -' -'   -' '   -  --'
#
#                    Freedom in the Cloud
#
# DNS functions
#
# License
# =======
#
# Copyright (C) 2014-2016 Bob Mottram <bob@robotics.uk.to>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# DNS
NAMESERVER1='213.73.91.35'
NAMESERVER2='85.214.20.141'

# parameters used when adding a new domain
DDNS_PROVIDER="default@freedns.afraid.org"
DDNS_USERNAME=
DDNS_PASSWORD=

INADYN_REPO="https://github.com/bashrc/inadyn"
INADYN_COMMIT='fadbe17f520d337dfb8d69ee4bf1fcaa23fce0d6'

# web site used to obtain the external IP address of the system
GET_IP_ADDRESS_URL="checkip.two-dns.de"

# other possible services to obtain the external IP address
EXTERNAL_IP_SERVICES=( \
	    'https://check.torproject.org/' \
		'https://www.whatsmydns.net/whats-my-ip-address.html' \
		'https://www.privateinternetaccess.com/pages/whats-my-ip/' \
		'http://checkip.two-dns.de' \
		'http://ip.dnsexit.com' \
		'http://ifconfig.me/ip' \
		'http://ipecho.net/plain' \
		'http://checkip.dyndns.org/plain' \
		'http://ipogre.com/linux.php' \
		'http://whatismyipaddress.com/' \
		'http://ip.my-proxy.com/' \
		'http://websiteipaddress.com/WhatIsMyIp' \
		'http://getmyipaddress.org/' \
		'http://www.my-ip-address.net/' \
		'http://myexternalip.com/raw' \
		'http://www.canyouseeme.org/' \
		'http://www.trackip.net/' \
		'http://icanhazip.com/' \
		'http://www.iplocation.net/' \
		'http://www.howtofindmyipaddress.com/' \
		'http://www.ipchicken.com/' \
		'http://whatsmyip.net/' \
		'http://www.ip-adress.com/' \
		'http://checkmyip.com/' \
		'http://www.tracemyip.org/' \
		'http://checkmyip.net/' \
		'http://www.lawrencegoetz.com/programs/ipinfo/' \
		'http://www.findmyip.co/' \
		'http://ip-lookup.net/' \
		'http://www.dslreports.com/whois' \
		'http://www.mon-ip.com/en/my-ip/' \
		'http://www.myip.ru' \
		'http://ipgoat.com/' \
		'http://www.myipnumber.com/my-ip-address.asp' \
		'http://www.whatsmyipaddress.net/' \
		'http://formyip.com/' \
		'http://www.displaymyip.com/' \
		'http://www.bobborst.com/tools/whatsmyip/' \
		'http://www.geoiptool.com/' \
		'http://checkip.dyndns.com/' \
		'http://myexternalip.com/' \
		'http://www.ip-adress.eu/' \
		'http://www.infosniper.net/' \
		'http://wtfismyip.com/' \
		'http://ipinfo.io/' \
		'http://httpbin.org/ip')

function create_freedns_updater {
	if [[ $ONION_ONLY != "no" ]]; then
		return
	fi

	# currently inadyn doesn't work as expected with freeDNS, so this is a workaround
	if grep -Fxq "create_freedns_updater" $COMPLETION_FILE; then
		return
	fi
	if [[ $DDNS_PROVIDER != "default@freedns.afraid.org" ]]; then
		return
	fi
	if [[ $SYSTEM_TYPE == "$VARIANT_MESH" ]]; then
		return
	fi

	FREEDNS_WGET='wget -q --read-timeout=0.0 --waitretry=5 --tries=4 https://freedns.afraid.org/dynamic/update.php?'

	echo '#!/bin/bash' > /usr/bin/dynamicdns
	echo 'cd /tmp' >> /usr/bin/dynamicdns
	if [ $DEFAULT_DOMAIN_CODE ]; then
		echo "# $DEFAULT_DOMAIN_NAME" >> /usr/bin/dynamicdns
		echo "$FREEDNS_WGET$DEFAULT_DOMAIN_CODE=" >> /usr/bin/dynamicdns
	fi
	if [ $WIKI_CODE ]; then
		if [[ $WIKI_CODE != "$DEFAULT_DOMAIN_CODE" ]]; then
			echo "# $WIKI_DOMAIN_NAME" >> /usr/bin/dynamicdns
			echo "$FREEDNS_WGET$WIKI_CODE=" >> /usr/bin/dynamicdns
		fi
	fi
	if [ $FULLBLOG_CODE ]; then
		if [[ $FULLBLOG_CODE != "$DEFAULT_DOMAIN_CODE" ]]; then
			echo "# $FULLBLOG_DOMAIN_NAME" >> /usr/bin/dynamicdns
			echo "$FREEDNS_WGET$FULLBLOG_CODE=" >> /usr/bin/dynamicdns
		fi
	fi
	if [ $HUBZILLA_CODE ]; then
		if [[ $HUBZILLA_CODE != "$DEFAULT_DOMAIN_CODE" ]]; then
			echo "# $HUBZILLA_DOMAIN_NAME" >> /usr/bin/dynamicdns
			echo "$FREEDNS_WGET$HUBZILLA_CODE=" >> /usr/bin/dynamicdns
		fi
	fi
	if [ $MICROBLOG_CODE ]; then
		if [[ $MICROBLOG_CODE != "$DEFAULT_DOMAIN_CODE" ]]; then
			echo "# $MICROBLOG_DOMAIN_NAME" >> /usr/bin/dynamicdns
			echo "$FREEDNS_WGET$MICROBLOG_CODE=" >> /usr/bin/dynamicdns
		fi
	fi
	if [ $GIT_CODE ]; then
		if [[ $GIT_CODE != "$DEFAULT_DOMAIN_CODE" ]]; then
			echo "# $GIT_DOMAIN_NAME" >> /usr/bin/dynamicdns
			echo "$FREEDNS_WGET$GIT_CODE=" >> /usr/bin/dynamicdns
		fi
	fi
	if [ $MEDIAGOBLIN_CODE ]; then
		if [[ $MEDIAGOBLIN_CODE != "$DEFAULT_DOMAIN_CODE" ]]; then
			echo "# $MEDIAGOBLIN_DOMAIN_NAME" >> /usr/bin/dynamicdns
			echo "$FREEDNS_WGET$MEDIAGOBLIN_CODE=" >> /usr/bin/dynamicdns
		fi
	fi
	echo 'exit 0' >> /usr/bin/dynamicdns
	chmod 600 /usr/bin/dynamicdns
	chmod +x /usr/bin/dynamicdns

	if ! grep -q "/usr/bin/dynamicdns" /etc/crontab; then
		function_check cron_add_mins
		cron_add_mins 3 '/usr/bin/dynamicdns'
		systemctl restart cron
	fi

	echo 'create_freedns_updater' >> $COMPLETION_FILE
}

function add_ddns_domain {
	if [ ! $1 ]; then
		echo $'ddns domain not specified'
		exit 5638
	fi
	CURRENT_DDNS_DOMAIN="$1"
	if [[ $ONION_ONLY != "no" ]]; then
		return
	fi
	if [ ! -f /etc/inadyn.conf ]; then
		echo $'Unable to find inadyn configuration file /etc/inadyn.conf'
		exit 5745
	fi
	if ! grep -q "$DDNS_PROVIDER" /etc/inadyn.conf; then
		echo '' >> /etc/inadyn.conf
		echo "system $DDNS_PROVIDER" >> /etc/inadyn.conf
		echo '  ssl' >> /etc/inadyn.conf
		echo "  checkip-url $GET_IP_ADDRESS_URL /" >> /etc/inadyn.conf
		if [ $DDNS_USERNAME ]; then
			echo "  username $DDNS_USERNAME" >> /etc/inadyn.conf
		fi
		if [ $DDNS_PASSWORD ]; then
			echo "  password $DDNS_PASSWORD" >> /etc/inadyn.conf
		fi
	fi

	if ! grep -q "$CURRENT_DDNS_DOMAIN" /etc/inadyn.conf; then
		echo "  alias $CURRENT_DDNS_DOMAIN" >> /etc/inadyn.conf
	fi
	chmod 600 /etc/inadyn.conf
	systemctl restart inadyn
	systemctl daemon-reload
}

function configure_dns {
	if grep -Fxq "configure_dns" $COMPLETION_FILE; then
		return
	fi
	echo 'domain localdomain' > /etc/resolv.conf
	echo 'search localdomain' >> /etc/resolv.conf
	echo "nameserver $NAMESERVER1" >> /etc/resolv.conf
	echo "nameserver $NAMESERVER2" >> /etc/resolv.conf

	# prevent resolv.conf from changing
	chattr +i /etc/resolv.conf

	echo 'configure_dns' >> $COMPLETION_FILE
}

function set_hostname {
	DEFAULT_DOMAIN_NAME="$1"

	echo "$DEFAULT_DOMAIN_NAME" > /etc/hostname
	hostname $DEFAULT_DOMAIN_NAME

	if grep -q "127.0.1.1" /etc/hosts; then
		sed -i "s/127.0.1.1.*/127.0.1.1       $DEFAULT_DOMAIN_NAME/g" /etc/hosts
	else
		echo "127.0.1.1  $DEFAULT_DOMAIN_NAME" >> /etc/hosts
	fi
}

function set_your_domain_name {
	if grep -Fxq "set_your_domain_name" $COMPLETION_FILE; then
		return
	fi

	function_check set_hostname
	set_hostname $DEFAULT_DOMAIN_NAME

	echo 'set_your_domain_name' >> $COMPLETION_FILE
}

# NOTE: deliberately no exit 0
