From 2eb0efacac35c2f8829d64f9293030f239bf79f1 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Mon, 8 Sep 2014 22:40:27 +0200
Subject: Move systemd unit to a new doc/examples dir, add OpenWrt example
 config and init script

---
 doc/examples/fastd@.service       |  11 +
 doc/examples/openwrt/fastd.config | 143 +++++++++++++
 doc/examples/openwrt/fastd.init   | 425 ++++++++++++++++++++++++++++++++++++++
 doc/fastd@.service                |  11 -
 4 files changed, 579 insertions(+), 11 deletions(-)
 create mode 100644 doc/examples/fastd@.service
 create mode 100644 doc/examples/openwrt/fastd.config
 create mode 100644 doc/examples/openwrt/fastd.init
 delete mode 100644 doc/fastd@.service

diff --git a/doc/examples/fastd@.service b/doc/examples/fastd@.service
new file mode 100644
index 0000000..63cc941
--- /dev/null
+++ b/doc/examples/fastd@.service
@@ -0,0 +1,11 @@
+[Unit]
+Description=Fast and Secure Tunnelling Daemon (connection %I)
+After=network.target
+
+[Service]
+Type=notify
+ExecStart=/usr/bin/fastd --syslog-level info --syslog-ident fastd@%I -c /etc/fastd/%I/fastd.conf
+ExecReload=/bin/kill -HUP $MAINPID
+
+[Install]
+WantedBy=multi-user.target
diff --git a/doc/examples/openwrt/fastd.config b/doc/examples/openwrt/fastd.config
new file mode 100644
index 0000000..b47cc65
--- /dev/null
+++ b/doc/examples/openwrt/fastd.config
@@ -0,0 +1,143 @@
+package fastd
+
+config fastd sample_config
+
+	# Set to 1 to enable this instance:
+	option enabled 0
+
+	# Sets a static config file, optional
+	# Options set via UCI have higher priority that statically configured ones
+#	list config '/etc/fastd/sample_config/fastd.conf'
+
+	# Configures a single static peer from a configuration file
+#	list config_peer '/etc/fastd/sample_config/sample_peer.conf'
+
+	# Sets an additional directory from which peers configurations are read
+	# The peer list can be reloaded without restarting fastd
+	# Peer can either be configured via UCI (see examples below) or via peer dirs
+	# Can't be used in tun mode
+#	list config_peer_dir '/etc/fastd/sample_config/peers'
+
+	# Sets the log level
+	# Possible values: error, warn, info, verbose, debug
+	# Default: info
+	option syslog_level 'info'
+
+	# IP address and port of the local end, optional
+	# 'any' can be used to bind to both IPv4 and IPv6
+	# If no port is given fastd will bind to a random port
+#	list bind 'any:1337'
+#	list bind '0.0.0.0:1337'
+#	list bind '[::]:1337'
+
+	# "method null" uses no encryption or MAC
+	# "method xsalsa20-poly1305" uses the XSalsa20 encryption ad the Poly1305 MAC
+	list method 'xsalsa20-poly1305'
+
+	# "mode tap" will create an ethernet tunnel (tap device),
+	# "mode tun" will create an IP tunnel (tun device).
+	option mode 'tap'
+
+	# Set the name of the tunnel interface to use
+	option interface 'tap0'
+#	option interface 'tun0'
+#	option interface 'fastd0'
+
+	# Sets the MTU of the tunnel interface, default is 1500
+	# 1426 is a good value that avoids fragmentation for the xsalsa20-poly1305 method
+	# when the tunnel uses an IPv4 connection on a line with an MTU of 1492 or higher
+	option mtu 1426
+
+	# Enables direct forwaring of packets between peers
+	# WARNING: Only enable this if you know what you are doing, as this can lead to forwarding loops!
+	option forward 0
+
+	# Disable for compatiblity with fastd v10 and older
+	option secure_handshakes 1
+
+	# Set a packet mark to filter for with iptables or ip rules
+#	option packet_mark 42
+
+	# Limits the maximum number of connections, optional
+#	option peer_limit 5
+
+	# The secret key
+	# A keypair can be generated with `fastd --generate-key`
+	# When the corresponding public key is lost it can be recovered with `/etc/init.d/fastd show-key <config name>`
+#	option secret '0000000000000000000000000000000000000000000000000000000000000000'
+
+	# Sets the user to run fastd as. Defaults to root
+#	option user 'daemon'
+
+	# Sets the group to run fastd as. Defaults to the user's primary group
+#	option group 'daemon'
+
+	# If set to 1, the logs won't contain peers' IP addresses
+#	option hide_ip_addresses '0'
+
+	# If set to 1, the logs won't contain peers' MAC addresses
+#	option hide_mac_addresses '0'
+
+	# Read the documentation about this one. Only ever useful in severly broken networks.
+#	option pmtu ''
+
+	# command to configure IP addresses etc. after the tunnel interface is up; $1 will be the interface name (optional)
+#	option up ''
+
+	# command to execute before the tunnel interface is set down; $1 will be the interface name (optional)
+#	option down ''
+
+
+config peer sample_peer
+
+	# Set to 1 to enable this peer
+	# In tap mode peers can be reloaded dynamically
+	option enabled 0
+
+	# Controls which instance this peer is associated with
+	option net 'sample_config'
+
+	# Controls which peer group this peer belongs to, optional
+	# For most use cases peer groups aren't necessary
+#	option group 'sample_group'
+
+	# The peer's public key
+	option key '0000000000000000000000000000000000000000000000000000000000000000'
+
+	# A remote specification consists of an address or a hostname, and a port
+	# When a hostname is given, it is recommended to specify the address family to use
+	# It is possible to specify no, one or multiple remotes
+	# (but all entries must designate the same host as the public key must be unique)
+#	list remote '192.0.2.1:1337'
+#	list remote '[2001:db8::1]:1337'
+#	list remote '"example.com" port 1337'
+#	list remote 'ipv4 "example.com" port 1337'
+#	list remote 'ipv6 "example.com" port 1337'
+
+	# Setting float to 1 allow incoming connections with this key from other addresses/hostnames/ports than the specified remotes
+#	option float 0
+
+
+config peer_group sample_group
+
+	# Set to 1 to enable this peer group
+	option enabled 0
+
+	# Controls which instance this peer group is associated with
+	# Peer groups can't be used in tun mode
+	option net 'sample_config'
+
+	# Allows configuring nested groups
+#	option parent 'other_group'
+
+	# Includes another config file inside the peer group definition
+#	list config '/etc/fastd/sample_config/sample_group.conf'
+
+	# Configures a single static peer from a configuration file
+#	list config_peer '/etc/fastd/sample_config/sample_peer.conf'
+
+	# Configures an additional peer directory for this group
+#	list config_peer_dir '/etc/fastd/sample_config/peers2'
+
+	# Limits the maximum number of connections to peers in this group (optional)
+#	option peer_limit 5
diff --git a/doc/examples/openwrt/fastd.init b/doc/examples/openwrt/fastd.init
new file mode 100644
index 0000000..3a20922
--- /dev/null
+++ b/doc/examples/openwrt/fastd.init
@@ -0,0 +1,425 @@
+#!/bin/sh /etc/rc.common
+# Copyright (C) 2012-2013 OpenWrt.org
+
+START=95
+
+SERVICE_USE_PID=1
+
+EXTRA_COMMANDS="up down show_key generate_key"
+
+LIST_SEP="
+"
+TMP_FASTD=/tmp/fastd
+FASTD_COMMAND=/usr/bin/fastd
+
+
+section_enabled() {
+	config_get_bool enabled "$1" 'enabled' 0
+	[ $enabled -gt 0 ]
+}
+
+error() {
+	echo "${initscript}:" "$@" 1>&2
+}
+
+get_key_instance() {
+	local s="$1"
+
+	config_get secret "$s" secret
+	if [ "$secret" = 'generate' ]; then
+		secret=`"$FASTD_COMMAND" --generate-key --machine-readable`
+		uci -q set fastd."$s".secret="$secret" && uci -q commit fastd
+	fi
+
+	echo "$secret"
+}
+
+
+escape_string() {
+	local t=${1//\\/\\\\}
+	echo -n "\"${t//\"/\\\"}\""
+}
+
+guard_value() {
+	local t=${1//[^-a-z0-9\[\].:]/}
+	echo -n "$t"
+}
+
+guard_remote() {
+	local t=${1//[^-a-zA-Z0-9\[\].:\"% ]/}
+	local quotes=${t//[^\"]/}
+	if [ "${#quotes}" = 0 -o "${#quotes}" = 2 ]; then
+		echo -n "$t"
+	fi
+}
+
+yes_no() {
+	case "$1" in
+		0|no|off|false|disabled) echo -n no;;
+		*) echo -n yes;;
+	esac
+}
+
+config_string_config='include $(escape_string "$value");'
+config_string_config_peer='include peer $(escape_string "$value");'
+config_string_config_peer_dir='include peers from $(escape_string "$value");'
+config_string_bind='bind $(guard_value "$value");'
+config_string_method='method $(escape_string "$value");'
+config_string_syslog_level='log to syslog level $(guard_value "$value");'
+config_string_mode='mode $(guard_value "$value");'
+config_string_interface='interface $(escape_string "$value");'
+config_string_mtu='mtu $(guard_value "$value");'
+config_string_peer_limit='peer limit $(guard_value "$value");'
+config_string_user='user $(escape_string "$value");'
+config_string_group='group $(escape_string "$value");'
+config_string_pmtu='pmtu $(yes_no "$value");'
+config_string_forward='forward $(yes_no "$value");'
+config_string_hide_ip_addresses='hide ip addresses $(yes_no "$value");'
+config_string_hide_mac_addresses='hide mac addresses $(yes_no "$value");'
+config_string_secure_handshakes='secure handshakes $(yes_no "$value");'
+config_string_packet_mark='packet mark $(guard_value "$value");'
+
+config_string_peer='peer $(escape_string "$value") {'
+config_string_peer_group='peer group $(escape_string "$value") {'
+
+peer_string_key='key $(escape_string "$value");'
+peer_string_float='float $(yes_no "$value");'
+peer_string_remote='remote $(guard_remote "$value");'
+
+generate_option() {
+	local __string=$(eval echo \"\$$2\")
+	local value="$1";
+	eval echo "\"$__string\""
+}
+
+append_option() {
+	local v; local len; local s="$1"; local prefix="$2"; local p="$3"
+
+	config_get len "$s" "${p}_LENGTH"
+
+	if [ -z "$len" ]; then
+		config_get v "$s" "$p"
+		[ -n "$v" ] && generate_option "$v" "${prefix}_string_${p}"
+	else
+		config_list_foreach "$s" "$p" generate_option "${prefix}_string_${p}"
+	fi
+}
+
+append_options() {
+	local p; local s="$1"; local prefix="$2"; shift; shift
+	for p in $*; do
+		append_option "$s" "$prefix" "$p"
+	done
+}
+
+
+generate_config_secret() {
+	echo "secret $(escape_string "$1");"
+}
+
+
+generate_peer_config() {
+	local peer="$1"
+
+	# These options are deprecated
+	config_get address "$peer" address
+	config_get hostname "$peer" hostname
+	config_get address_family "$peer" address_family
+	config_get port "$peer" port
+
+	if [ "$address" -o "$hostname" ]; then
+		if [ -z "$port" ]; then
+			error "peer $peer: address or hostname, but no port given"
+			return 1
+		fi
+
+		if [ "$hostname" ]; then
+			generate_option peer_string_remote "$address_family \"$hostname\" port $port"
+		fi
+
+		if [ "$address" ]; then
+			generate_option peer_string_remote "$address port $port"
+		fi
+	fi
+
+	append_options "$peer" peer \
+		key float remote
+}
+
+generate_single_peer_config() {
+	local peer="$1"; local net="$2"
+
+	config_get peer_net "$peer" net
+	config_get peer_group "$peer" group
+	[ "$net" = "$peer_net" -a "$peer_group" = '' ] || return 0
+
+	section_enabled "$peer" || return 0
+
+	generate_option "$peer" config_string_peer
+	generate_peer_config "$peer"
+	echo '}'
+}
+
+create_peer_config() {
+	local peer="$1"; local net="$2"; local group="$3"; local path="$4"
+
+	config_get peer_net "$peer" net
+	config_get peer_group "$peer" group
+	[ "$group" = "$peer_group" ] || return 0
+
+	if [ "$net" != "$peer_net" ]; then
+		[ -z "$group" ] || error "warning: the peer group of peer '$peer' doesn't match its net, the peer will be ignored"
+		return 0
+	fi
+
+	section_enabled "$peer" || return 0
+
+	generate_peer_config "$peer" >"$path/$peer"
+}
+
+update_peer_group() {
+	local net="$1"; local group_dir="$2"; local group="$3"; local update_only="$4"
+	local path="$TMP_FASTD/fastd.$net/$group_dir"
+
+	rm -rf "$path"
+	mkdir -p "$path"
+
+	config_foreach create_peer_config 'peer' "$net" "$group" "$path"
+
+	if [ -z "$update_only" ]; then
+		generate_option "$path" config_string_config_peer_dir
+	fi
+
+	config_foreach generate_peer_group_config 'peer_group' "$net" "$group_dir" "$update_only" "$group"
+}
+
+generate_peer_group_config() {
+	local group="$1"; local net="$2"; local group_dir="$3%$group"; local update_only="$4"; local parent="$5"
+
+	config_get group_net "$group" net
+	config_get group_parent "$group" parent
+	[ "$parent" = "$group_parent" ] || return 0
+
+	if [ "$net" != "$peer_net" ]; then
+		[ -z "$parent" ] || error "warning: the parent of peer group '$group' doesn't match its net, the peer group will be ignored"
+		return 0
+	fi
+
+	section_enabled "$group" || return 0
+
+	if [ -z "$update_only" ]; then
+		generate_option "$group" config_string_peer_group
+		append_options "$group" config \
+			config config_peer config_peer_dir peer_limit
+	fi
+
+	update_peer_group "$net" "$group_dir" "$group" "$update_only"
+
+	if [ -z "$update_only" ]; then
+		echo '}'
+	fi
+}
+
+update_peer_groups() {
+	local net="$1"; local update_only="$2"
+
+	update_peer_group "$net" 'peers' '' "$update_only"
+}
+
+generate_config() {
+	local s="$1"
+
+	generate_option 'info' config_string_syslog_level
+
+	append_options "$s" config \
+		config config_peer config_peer_dir bind method syslog_level mode interface mtu peer_limit \
+		user group pmtu forward hide_ip_addresses hide_mac_addresses secure_handshakes packet_mark
+
+	config_get mode "$s" mode
+
+	if [ "$mode" = "tun" ]; then
+		config_foreach generate_single_peer_config 'peer' "$s"
+	else
+		update_peer_groups "$s"
+	fi
+}
+
+
+generate_key_instance() {
+	local s="$1"
+
+	config_get secret "$s" secret
+	if [ -z "$secret" -o "$secret" = 'generate' ]; then
+		secret=`fastd --generate-key --machine-readable`
+		uci -q set fastd."$s".secret="$secret" && uci -q commit fastd
+	fi
+
+	generate_config_secret "$secret" | "$FASTD_COMMAND" --config - --show-key --machine-readable
+}
+
+show_key_instance() {
+	local s="$1"
+
+	local secret=`get_key_instance "$s"`
+	if [ -z "$secret" ]; then
+		error "$s: secret is not set"
+		return 1
+	fi
+
+	generate_config_secret "$secret" | "$FASTD_COMMAND" --config - --show-key --machine-readable
+}
+
+start_instance() {
+	local s="$1"
+
+	section_enabled "$s" || return 1
+
+	SERVICE_PID_FILE="/var/run/fastd.$s.pid"
+
+	config_get interface "$s" interface
+	if [ -z "$interface" ]; then
+		error "$s: interface is not set"
+		return 1
+	fi
+
+	if ifconfig "$interface" &>/dev/null; then
+		error "$s: interface '$interface' is already in use"
+		return 1
+	fi
+
+	config_get mode "$s" mode
+	if [ -z "$mode" ]; then
+		error "$s: mode is not set"
+		return 1
+	fi
+
+	local secret=`get_key_instance "$s"`
+	if [ -z "$secret" ]; then
+		error "$s: secret is not set"
+		return 1
+	fi
+
+	rm -f "$SERVICE_PID_FILE"
+	touch "$SERVICE_PID_FILE"
+
+	config_get user "$s" user
+	if [ "$user" ]; then
+		chown "$user" "$SERVICE_PID_FILE"
+	fi
+
+	(generate_config_secret "$secret"; generate_config "$s") | service_start "$FASTD_COMMAND" --config - --daemon --pid-file "$SERVICE_PID_FILE"
+
+	if ! ifconfig "$interface" >/dev/null 2>&1; then
+		error "$s: startup failed"
+		return 1
+	fi
+
+	config_get up "$s" up
+	[ -n "$up" ] && sh -c "$up" - "$interface"
+}
+
+stop_instance() {
+	local s="$1"
+
+	section_enabled "$s" || return 1
+
+	SERVICE_PID_FILE="/var/run/fastd.$s.pid"
+
+	config_get interface "$s" interface
+	if [ -z "$interface" ]; then
+		error "$s: interface is not set"
+		return 1
+	fi
+
+	if ! ifconfig "$interface" &>/dev/null; then
+		error "$s: interface '$interface' does not exist"
+		return 1
+	fi
+
+	config_get down "$s" down
+	[ -n "$down" ] && sh -c "$down" - "$interface"
+
+	service_stop "$FASTD_COMMAND"
+
+	rm -rf "$TMP_FASTD/fastd.$s"
+}
+
+reload_instance() {
+	local s="$1"
+
+	section_enabled "$s" || return 1
+
+	config_get mode "$s" mode
+	[ "$mode" = "tun" ] && return 1
+
+	update_peer_groups "$s" true
+
+	SERVICE_PID_FILE="/var/run/fastd.$s.pid"
+	service_reload "$FASTD_COMMAND"
+}
+
+start() {
+	config_load 'fastd'
+	config_foreach start_instance 'fastd'
+	return 0
+}
+
+stop() {
+	config_load 'fastd'
+	config_foreach stop_instance 'fastd'
+	return 0
+}
+
+reload() {
+	config_load 'fastd'
+	config_foreach reload_instance 'fastd'
+	return 0
+}
+
+up() {
+	local exists
+	local instance
+	config_load 'fastd'
+	for instance in "$@"; do
+		config_get exists "$instance" 'TYPE'
+		if [ "$exists" = 'fastd' ]; then
+			start_instance "$instance"
+		fi
+	done
+}
+
+down() {
+	local exists
+	local instance
+	config_load 'fastd'
+	for instance in "$@"; do
+		config_get exists "$instance" 'TYPE'
+		if [ "$exists" = 'fastd' ]; then
+			stop_instance "$instance"
+		fi
+	done
+}
+
+show_key() {
+	local exists
+	local instance
+	config_load 'fastd'
+	for instance in "$@"; do
+		config_get exists "$instance" 'TYPE'
+		if [ "$exists" = 'fastd' ]; then
+			show_key_instance "$instance"
+		fi
+	done
+}
+
+generate_key() {
+	local exists
+	local instance
+	config_load 'fastd'
+	for instance in "$@"; do
+		config_get exists "$instance" 'TYPE'
+		if [ "$exists" = 'fastd' ]; then
+			generate_key_instance "$instance"
+		fi
+	done
+}
diff --git a/doc/fastd@.service b/doc/fastd@.service
deleted file mode 100644
index 63cc941..0000000
--- a/doc/fastd@.service
+++ /dev/null
@@ -1,11 +0,0 @@
-[Unit]
-Description=Fast and Secure Tunnelling Daemon (connection %I)
-After=network.target
-
-[Service]
-Type=notify
-ExecStart=/usr/bin/fastd --syslog-level info --syslog-ident fastd@%I -c /etc/fastd/%I/fastd.conf
-ExecReload=/bin/kill -HUP $MAINPID
-
-[Install]
-WantedBy=multi-user.target
-- 
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