#!/bin/sh /etc/rc.common

USE_PROCD=1
START=25

EXTRA_COMMANDS="uciadd ucidel"
EXTRA_HELP="\
	uciadd  Add default bridge configuration to network and firewall uci config
	ucidel  Delete default bridge configuration from network and firewall uci config"

DOCKERD_CONF="/tmp/dockerd/daemon.json"

uci_quiet() {
	uci -q ${@} >/dev/null
}

json_add_array_string() {
	json_add_string "" "$1"
}

boot() {
	uciadd
	rc_procd start_service
}

uciupdate() {
	local net="$1"

	uci -q get network.docker >/dev/null || {
		logger -t "dockerd-init" -p warn "No network uci config section for docker default bridge (docker0) found"
		return
	}

	[ -z "$net" ] && {
		logger -t "dockerd-init" -p notice "Removing network uci config options for docker default bridge (docker0)"
		uci_quiet delete network.docker.netmask
		uci_quiet delete network.docker.ipaddr
		uci_quiet commit network
		return
	}

	eval "$(ipcalc.sh "$net")"
	logger -t "dockerd-init" -p notice "Updating network uci config option \"$net\" for docker default bridge (docker0)"
	uci_quiet set network.docker.netmask="$NETMASK"
	uci_quiet set network.docker.ipaddr="$IP"
	uci_quiet commit network
}

uciadd() {
	/etc/init.d/dockerd running && {
		echo "Please stop dockerd service first"
		exit 0
	}

	# Add network interface
	if ! uci -q get network.docker >/dev/null; then
		logger -t "dockerd-init" -p notice "Adding docker default bridge to network uci config (docker0)"
		uci_quiet add network interface
		uci_quiet rename network.@interface[-1]="docker"
		uci_quiet set network.docker.ifname="docker0"
		uci_quiet set network.docker.proto="static"
		uci_quiet set network.docker.auto="0"
		uci_quiet commit network
	fi

	# Add firewall zone
	if ! uci -q get firewall.docker >/dev/null; then
		logger -t "dockerd-init" -p notice "Adding docker default bridge firewall zone (docker0)"
		uci_quiet add firewall zone
		uci_quiet rename firewall.@zone[-1]="docker"
		uci_quiet set firewall.docker.network="docker"
		uci_quiet set firewall.docker.input="REJECT"
		uci_quiet set firewall.docker.output="ACCEPT"
		uci_quiet set firewall.docker.forward="REJECT"
		uci_quiet set firewall.docker.name="docker"
		uci_quiet commit firewall
	fi

	reload_config
}

ucidel() {
	/etc/init.d/dockerd running && {
		echo "Please stop dockerd service first"
		exit 0
	}

	logger -t "dockerd-init" -p notice "Deleting docker default bridge network from network uci config (docker0)"
	uci_quiet delete network.docker
	uci_quiet commit network

	logger -t "dockerd-init" -p notice "Deleting docker default bridge firewall zone from firewall uci config (docker0)"
	uci_quiet delete firewall.docker
	uci_quiet commit firewall

	reload_config
}

process_config() {
	local alt_config_file data_root log_level bip

	rm -f "$DOCKERD_CONF"

	[ -f /etc/config/dockerd ] || {
		# Use the daemon default configuration
		DOCKERD_CONF=""
		return 0
	}

	config_load 'dockerd'

	config_get alt_config_file globals alt_config_file
	[ -n "$alt_config_file" ] && [ -f "$alt_config_file" ] && {
		ln -s "$alt_config_file" "$DOCKERD_CONF"
		return 0
	}

	config_get data_root globals data_root "/opt/docker/"
	config_get log_level globals log_level "warn"
	config_get bip globals bip ""

	. /usr/share/libubox/jshn.sh
	json_init
	json_add_string "data-root" "$data_root"
	json_add_string "log-level" "$log_level"
	[ -z "$bip" ] || json_add_string "bip" "$bip"
	json_add_array "registry-mirrors"
	config_list_foreach globals registry_mirrors json_add_array_string
	json_close_array
	json_add_array "hosts"
	config_list_foreach globals hosts json_add_array_string
	json_close_array

	mkdir -p /tmp/dockerd
	json_dump > "$DOCKERD_CONF"

	uciupdate "$bip"
}

start_service() {
	local nofile=$(cat /proc/sys/fs/nr_open)

	process_config

	procd_open_instance
	procd_set_param stderr 1
	if [ -z "$DOCKERD_CONF" ]; then
		procd_set_param command /usr/bin/dockerd
	else
		procd_set_param command /usr/bin/dockerd --config-file="$DOCKERD_CONF"
	fi
	procd_set_param limits nofile="${nofile} ${nofile}"
	procd_close_instance
}

reload_service() {
	process_config
	procd_send_signal dockerd
}

service_triggers() {
	procd_add_reload_trigger 'dockerd'
}

ip4tables_remove_nat() {
	iptables -t nat -D OUTPUT ! -d 127.0.0.0/8 -m addrtype --dst-type LOCAL -j DOCKER
	iptables -t nat -D PREROUTING -m addrtype --dst-type LOCAL -j DOCKER

	iptables -t nat -F DOCKER
	iptables -t nat -X DOCKER
}

ip4tables_remove_filter() {
	# Chain DOCKER-USER is only present,
	# if bip option is NOT set, so >/dev/null 2>&1
	iptables -t filter -D FORWARD -j DOCKER-USER >/dev/null 2>&1
	iptables -t filter -D FORWARD -j DOCKER-ISOLATION-STAGE-1
	iptables -t filter -D FORWARD -o docker0 -j DOCKER

	iptables -t filter -F DOCKER
	iptables -t filter -F DOCKER-ISOLATION-STAGE-1
	iptables -t filter -F DOCKER-ISOLATION-STAGE-2
	# Chain DOCKER-USER is only present,
	# if bip option is NOT set, so >/dev/null 2>&1
	iptables -t filter -F DOCKER-USER >/dev/null 2>&1

	iptables -t filter -X DOCKER
	iptables -t filter -X DOCKER-ISOLATION-STAGE-1
	iptables -t filter -X DOCKER-ISOLATION-STAGE-2
	# Chain DOCKER-USER is only present,
	# if bip option is NOT set, so >/dev/null 2>&1
	iptables -t filter -X DOCKER-USER >/dev/null 2>&1
}

ip4tables_remove() {
	ip4tables_remove_nat
	ip4tables_remove_filter
}

stop_service() {
	if /etc/init.d/dockerd running; then
		service_stop "/usr/bin/dockerd"
		ip4tables_remove
	fi
}