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#!/system/xbin/bash |
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# |
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# Copyright (C) 2016-2017 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. |
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# |
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set -e -o pipefail |
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shopt -s extglob |
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export LC_ALL=C |
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SELF="$(readlink -f "${BASH_SOURCE[0]}")" |
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export PATH="${SELF%/*}:$PATH" |
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WG_CONFIG="" |
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INTERFACE="" |
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NETID=0 |
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ADDRESSES=( ) |
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MTU="" |
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DNS="" |
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CONFIG_FILE="" |
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PROGRAM="${0##*/}" |
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ARGS=( "$@" ) |
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parse_options() { |
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local interface_section=0 line key value |
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CONFIG_FILE="$1" |
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[[ $CONFIG_FILE =~ ^[a-zA-Z0-9_=+.-]{1,16}$ ]] && CONFIG_FILE="/data/misc/wireguard/$CONFIG_FILE.conf" |
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[[ -e $CONFIG_FILE ]] || die "\`$CONFIG_FILE' does not exist" |
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[[ $CONFIG_FILE =~ /?([a-zA-Z0-9_=+.-]{1,16})\.conf$ ]] || die "The config file must be a valid interface name, followed by .conf" |
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((($(stat -c '%#a' "$CONFIG_FILE") & 0007) == 0)) || echo "Warning: \`$CONFIG_FILE' is world accessible" >&2 |
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INTERFACE="${BASH_REMATCH[1]}" |
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shopt -s nocasematch |
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while read -r line || [[ -n $line ]]; do |
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key="${line%%=*}"; key="${key##*( )}"; key="${key%%*( )}" |
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value="${line#*=}"; value="${value##*( )}"; value="${value%%*( )}" |
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[[ $key == "["* ]] && interface_section=0 |
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[[ $key == "[Interface]" ]] && interface_section=1 |
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if [[ $interface_section -eq 1 ]]; then |
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case "$key" in |
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Address) ADDRESSES+=( ${value//,/ } ); continue ;; |
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MTU) MTU="$value"; continue ;; |
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DNS) DNS="$value"; continue ;; |
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esac |
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fi |
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WG_CONFIG+="$line"$'\n' |
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done < "$CONFIG_FILE" |
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shopt -u nocasematch |
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} |
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cmd() { |
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echo "[#] $*" >&2 |
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"$@" |
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} |
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cndc() { |
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local out="$(cmd ndc "$@")" |
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[[ $out == *200\ 0* ]] || { echo "$out"; return 1; } |
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} |
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die() { |
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echo "$PROGRAM: $*" >&2 |
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exit 1 |
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} |
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auto_su() { |
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[[ $UID == 0 ]] || exec su -p -c "'$SELF' ${ARGS[*]}" |
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} |
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add_if() { |
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cmd ip link add "$INTERFACE" type wireguard |
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} |
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del_if() { |
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cmd ip link del "$INTERFACE" |
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[[ $(ip rule show) =~ 0xc([0-9a-f]+)/0xcffff\ lookup\ $INTERFACE ]] && cndc network destroy $(( 0x${BASH_REMATCH[1]} )); |
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} |
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up_if() { |
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while [[ $NETID -lt 4096 ]]; do |
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NETID="$RANDOM" |
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done |
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cmd wg set "$INTERFACE" fwmark 0x20000 |
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cndc interface setcfg "$INTERFACE" up |
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cndc network create "$NETID" vpn 1 1 |
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cndc network interface add "$NETID" "$INTERFACE" |
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cndc network users add "$NETID" 0-99999 |
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} |
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set_dns() { |
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cndc resolver setnetdns "$NETID" "" "$1" |
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} |
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add_addr() { |
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if [[ $1 == *:* ]]; then |
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cndc interface ipv6 "$INTERFACE" enable |
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cmd ip -6 addr add "$1" dev "$INTERFACE" |
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else |
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local ip="${1%%/*}" mask=32 |
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[[ $1 == */* ]] && mask="${1##*/}" |
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cndc interface setcfg "$INTERFACE" "$ip" "$mask" |
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fi |
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} |
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set_mtu() { |
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local mtu=0 endpoint output |
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if [[ -n $MTU ]]; then |
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cndc interface setmtu "$INTERFACE" "$MTU" |
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return |
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fi |
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while read -r _ endpoint; do |
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[[ $endpoint =~ ^\[?([a-z0-9:.]+)\]?:[0-9]+$ ]] || continue |
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output="$(ip route get "${BASH_REMATCH[1]}" || true)" |
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[[ ( $output =~ mtu\ ([0-9]+) || ( $output =~ dev\ ([^ ]+) && $(ip link show dev "${BASH_REMATCH[1]}") =~ mtu\ ([0-9]+) ) ) && ${BASH_REMATCH[1]} -gt $mtu ]] && mtu="${BASH_REMATCH[1]}" |
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done < <(wg show "$INTERFACE" endpoints) |
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if [[ $mtu -eq 0 ]]; then |
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read -r output < <(ip route show default || true) || true |
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[[ ( $output =~ mtu\ ([0-9]+) || ( $output =~ dev\ ([^ ]+) && $(ip link show dev "${BASH_REMATCH[1]}") =~ mtu\ ([0-9]+) ) ) && ${BASH_REMATCH[1]} -gt $mtu ]] && mtu="${BASH_REMATCH[1]}" |
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fi |
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[[ $mtu -gt 0 ]] || mtu=1500 |
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cndc interface setmtu "$INTERFACE" $(( mtu - 80 )) |
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} |
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add_route() { |
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cndc network route add "$NETID" "$INTERFACE" "$1" |
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} |
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set_config() { |
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cmd wg setconf "$INTERFACE" <(echo "$WG_CONFIG") |
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} |
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cmd_usage() { |
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cat >&2 <<-_EOF |
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Usage: $PROGRAM [ up | down ] [ CONFIG_FILE | INTERFACE ] |
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CONFIG_FILE is a configuration file, whose filename is the interface name |
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followed by \`.conf'. Otherwise, INTERFACE is an interface name, with |
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configuration found at /data/misc/wireguard/INTERFACE.conf. It is to be readable |
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by wg(8)'s \`setconf' sub-command, with the exception of the following additions |
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to the [Interface] section, which are handled by $PROGRAM: |
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- Address: may be specified one or more times and contains one or more |
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IP addresses (with an optional CIDR mask) to be set for the interface. |
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- MTU: an optional MTU for the interface; if unspecified, auto-calculated. |
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- DNS: an optional DNS server to use while the device is up. |
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See wg-quick(8) for more info and examples. |
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_EOF |
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} |
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cmd_up() { |
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local i |
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[[ -z $(ip link show dev "$INTERFACE" 2>/dev/null) ]] || die "\`$INTERFACE' already exists" |
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trap 'del_if; exit' INT TERM EXIT |
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add_if |
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set_config |
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set_mtu |
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for i in "${ADDRESSES[@]}"; do |
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add_addr "$i" |
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done |
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up_if |
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[[ -z $DNS ]] || set_dns "$DNS" |
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for i in $(while read -r _ i; do for i in $i; do [[ $i =~ ^[0-9a-z:.]+/[0-9]+$ ]] && echo "$i"; done; done < <(wg show "$INTERFACE" allowed-ips) | sort -nr -k 2 -t /); do |
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[[ $(ip route get "$i" 2>/dev/null) == *dev\ $INTERFACE\ * ]] || add_route "$i" |
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done |
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trap - INT TERM EXIT |
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} |
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cmd_down() { |
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[[ -n $(ip link show dev "$INTERFACE" type wireguard 2>/dev/null) ]] || die "\`$INTERFACE' is not a WireGuard interface" |
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del_if |
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} |
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if [[ $# -eq 1 && ( $1 == --help || $1 == -h || $1 == help ) ]]; then |
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cmd_usage |
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elif [[ $# -eq 2 && $1 == up ]]; then |
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auto_su |
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parse_options "$2" |
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cmd_up |
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elif [[ $# -eq 2 && $1 == down ]]; then |
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auto_su |
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parse_options "$2" |
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cmd_down |
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else |
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cmd_usage |
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exit 1 |
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fi |
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exit 0 |