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Diffstat (limited to 'cli/wg-quick.bash')
| -rw-r--r-- | cli/wg-quick.bash | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/cli/wg-quick.bash b/cli/wg-quick.bash new file mode 100644 index 00000000..40417358 --- /dev/null +++ b/cli/wg-quick.bash @@ -0,0 +1,187 @@ +#!/system/xbin/bash +# +# Copyright (C) 2016-2017 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. +# + +set -e -o pipefail +shopt -s extglob +export LC_ALL=C + +SELF="$(readlink -f "${BASH_SOURCE[0]}")" +export PATH="${SELF%/*}:$PATH" + +WG_CONFIG="" +INTERFACE="" +NETID=0 +ADDRESSES=( ) +MTU="" +DNS="" +CONFIG_FILE="" +PROGRAM="${0##*/}" +ARGS=( "$@" ) + +parse_options() { + local interface_section=0 line key value + CONFIG_FILE="$1" + [[ $CONFIG_FILE =~ ^[a-zA-Z0-9_=+.-]{1,16}$ ]] && CONFIG_FILE="/data/misc/wireguard/$CONFIG_FILE.conf" + [[ -e $CONFIG_FILE ]] || die "\`$CONFIG_FILE' does not exist" + [[ $CONFIG_FILE =~ /?([a-zA-Z0-9_=+.-]{1,16})\.conf$ ]] || die "The config file must be a valid interface name, followed by .conf" + ((($(stat -c '%#a' "$CONFIG_FILE") & 0007) == 0)) || echo "Warning: \`$CONFIG_FILE' is world accessible" >&2 + INTERFACE="${BASH_REMATCH[1]}" + shopt -s nocasematch + while read -r line || [[ -n $line ]]; do + key="${line%%=*}"; key="${key##*( )}"; key="${key%%*( )}" + value="${line#*=}"; value="${value##*( )}"; value="${value%%*( )}" + [[ $key == "["* ]] && interface_section=0 + [[ $key == "[Interface]" ]] && interface_section=1 + if [[ $interface_section -eq 1 ]]; then + case "$key" in + Address) ADDRESSES+=( ${value//,/ } ); continue ;; + MTU) MTU="$value"; continue ;; + DNS) DNS="$value"; continue ;; + esac + fi + WG_CONFIG+="$line"$'\n' + done < "$CONFIG_FILE" + shopt -u nocasematch +} + +cmd() { + echo "[#] $*" >&2 + "$@" +} + +cndc() { + local out="$(cmd ndc "$@")" + [[ $out == *200\ 0* ]] || { echo "$out"; return 1; } +} + +die() { + echo "$PROGRAM: $*" >&2 + exit 1 +} + +auto_su() { + [[ $UID == 0 ]] || exec su -p -c "'$SELF' ${ARGS[*]}" +} + +add_if() { + cmd ip link add "$INTERFACE" type wireguard +} + +del_if() { + cmd ip link del "$INTERFACE" + [[ $(ip rule show) =~ 0xc([0-9a-f]+)/0xcffff\ lookup\ $INTERFACE ]] && cndc network destroy $(( 0x${BASH_REMATCH[1]} )); +} + +up_if() { + while [[ $NETID -lt 4096 ]]; do + NETID="$RANDOM" + done + cmd wg set "$INTERFACE" fwmark 0x20000 + cndc interface setcfg "$INTERFACE" up + cndc network create "$NETID" vpn 1 1 + cndc network interface add "$NETID" "$INTERFACE" + cndc network users add "$NETID" 0-99999 +} + +set_dns() { + cndc resolver setnetdns "$NETID" "" "$1" +} + +add_addr() { + if [[ $1 == *:* ]]; then + cndc interface ipv6 "$INTERFACE" enable + cmd ip -6 addr add "$1" dev "$INTERFACE" + else + local ip="${1%%/*}" mask=32 + [[ $1 == */* ]] && mask="${1##*/}" + cndc interface setcfg "$INTERFACE" "$ip" "$mask" + fi +} + +set_mtu() { + local mtu=0 endpoint output + if [[ -n $MTU ]]; then + cndc interface setmtu "$INTERFACE" "$MTU" + return + fi + while read -r _ endpoint; do + [[ $endpoint =~ ^\[?([a-z0-9:.]+)\]?:[0-9]+$ ]] || continue + output="$(ip route get "${BASH_REMATCH[1]}" || true)" + [[ ( $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]}" + done < <(wg show "$INTERFACE" endpoints) + if [[ $mtu -eq 0 ]]; then + read -r output < <(ip route show default || true) || true + [[ ( $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]}" + fi + [[ $mtu -gt 0 ]] || mtu=1500 + cndc interface setmtu "$INTERFACE" $(( mtu - 80 )) +} + +add_route() { + cndc network route add "$NETID" "$INTERFACE" "$1" +} + +set_config() { + cmd wg setconf "$INTERFACE" <(echo "$WG_CONFIG") +} + +cmd_usage() { + cat >&2 <<-_EOF + Usage: $PROGRAM [ up | down ] [ CONFIG_FILE | INTERFACE ] + + CONFIG_FILE is a configuration file, whose filename is the interface name + followed by \`.conf'. Otherwise, INTERFACE is an interface name, with + configuration found at /data/misc/wireguard/INTERFACE.conf. It is to be readable + by wg(8)'s \`setconf' sub-command, with the exception of the following additions + to the [Interface] section, which are handled by $PROGRAM: + + - Address: may be specified one or more times and contains one or more + IP addresses (with an optional CIDR mask) to be set for the interface. + - MTU: an optional MTU for the interface; if unspecified, auto-calculated. + - DNS: an optional DNS server to use while the device is up. + + See wg-quick(8) for more info and examples. + _EOF +} + +cmd_up() { + local i + [[ -z $(ip link show dev "$INTERFACE" 2>/dev/null) ]] || die "\`$INTERFACE' already exists" + trap 'del_if; exit' INT TERM EXIT + add_if + set_config + set_mtu + for i in "${ADDRESSES[@]}"; do + add_addr "$i" + done + up_if + [[ -z $DNS ]] || set_dns "$DNS" + 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 + [[ $(ip route get "$i" 2>/dev/null) == *dev\ $INTERFACE\ * ]] || add_route "$i" + done + trap - INT TERM EXIT +} + +cmd_down() { + [[ -n $(ip link show dev "$INTERFACE" type wireguard 2>/dev/null) ]] || die "\`$INTERFACE' is not a WireGuard interface" + del_if +} + +if [[ $# -eq 1 && ( $1 == --help || $1 == -h || $1 == help ) ]]; then + cmd_usage +elif [[ $# -eq 2 && $1 == up ]]; then + auto_su + parse_options "$2" + cmd_up +elif [[ $# -eq 2 && $1 == down ]]; then + auto_su + parse_options "$2" + cmd_down +else + cmd_usage + exit 1 +fi + +exit 0 |