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author | Jake McGinty <me@jake.su> | 2018-03-22 03:23:18 -0600 |
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committer | Jake McGinty <me@jake.su> | 2018-03-22 03:23:18 -0600 |
commit | 1dc75fa2043ed0a6749f404954ab84cf4ac5bd81 (patch) | |
tree | e0c9cfadac2ed55dde0b0e5fc27affb9bf13afdd /tools | |
parent | config: allow set operation to return error (diff) | |
download | wireguard-rs-1dc75fa2043ed0a6749f404954ab84cf4ac5bd81.tar.xz wireguard-rs-1dc75fa2043ed0a6749f404954ab84cf4ac5bd81.zip |
tools: modified rudimentary wg-quick.bash for macOS
Diffstat (limited to 'tools')
-rwxr-xr-x | tools/wg-quick.bash | 292 |
1 files changed, 292 insertions, 0 deletions
diff --git a/tools/wg-quick.bash b/tools/wg-quick.bash new file mode 100755 index 0000000..858ea74 --- /dev/null +++ b/tools/wg-quick.bash @@ -0,0 +1,292 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 +# +# Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. +# +# Modified by Jake McGinty <me@jake.su> for the userspace macOS implementation. +# + +set -e -o pipefail +shopt -s extglob +export LC_ALL=C + +SELF="$(greadlink -f "${BASH_SOURCE[0]}")" +export PATH="${SELF%/*}:$PATH" + +WG_CONFIG="" +INTERFACE="" +ADDRESSES=( ) +MTU="" +DNS=( ) +TABLE="" +PRE_UP=( ) +POST_UP=( ) +PRE_DOWN=( ) +POST_DOWN=( ) +SAVE_CONFIG=0 +CONFIG_FILE="" +PROGRAM="${0##*/}" +ARGS=( "$@" ) + +WGRS_PID=0 + +parse_options() { + local interface_section=0 line key value + CONFIG_FILE="$1" + [[ $CONFIG_FILE =~ ^[a-zA-Z0-9_=+.-]{1,15}$ ]] && CONFIG_FILE="/etc/wireguard/$CONFIG_FILE.conf" + [[ -e $CONFIG_FILE ]] || die "\`$CONFIG_FILE' does not exist" + [[ $CONFIG_FILE =~ /?([a-zA-Z0-9_=+.-]{1,15})\.conf$ ]] || die "The config file must be a valid interface name, followed by .conf" + CONFIG_FILE="$(greadlink -f "$CONFIG_FILE")" + ((($(gstat -c '0%#a' "$CONFIG_FILE") & $(gstat -c '0%#a' "${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="${key##*([[:space:]])}"; key="${key%%*([[:space:]])}" + value="${line#*=}"; value="${value##*([[:space:]])}"; value="${value%%*([[:space:]])}" + [[ $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+=( ${value//,/ } ); continue ;; + Table) TABLE="$value"; continue ;; + PreUp) PRE_UP+=( "$value" ); continue ;; + PreDown) PRE_DOWN+=( "$value" ); continue ;; + PostUp) POST_UP+=( "$value" ); continue ;; + PostDown) POST_DOWN+=( "$value" ); continue ;; + SaveConfig) read_bool SAVE_CONFIG "$value"; continue ;; + esac + fi + WG_CONFIG+="$line"$'\n' + done < "$CONFIG_FILE" + shopt -u nocasematch +} + +read_bool() { + case "$2" in + true) printf -v "$1" 1 ;; + false) printf -v "$1" 0 ;; + *) die "\`$2' is neither true nor false" + esac +} + +cmd() { + echo "[#] $*" >&2 + "$@" +} + +die() { + echo "$PROGRAM: $*" >&2 + exit 1 +} + +auto_su() { + [[ $UID == 0 ]] || exec sudo -p "$PROGRAM must be run as root. Please enter the password for %u to continue: " "$SELF" "${ARGS[@]}" +} + +add_if() { + cmd wireguard-rs "$INTERFACE" + sleep 1 +} + +del_if() { + cmd rm -f "/var/run/wireguard/$INTERFACE.sock" +} + +up_if() { + # cmd ip link set "$INTERFACE" up + # cmd ifconfig "$INTERFACE" up + cmd true +} + +add_addr() { + # IFS=. read ip1 ip2 ip3 ip4 <<< "$ip" + # cmd ip address add "$1" dev "$INTERFACE" + gateway=${1%%/*} + cmd ifconfig "$INTERFACE" inet add "$1" "$gateway" +} + +set_mtu() { + if [[ -n $MTU ]]; then + cmd ifconfig "$INTERFACE" mtu "$MTU" + return + fi + # TODO read internet adapter's mtu + cmd ifconfig "$INTERFACE" mtu 1420 +} + +HAVE_SET_DNS=0 +# TODO: this only works with the Wi-Fi adapter right now. +set_dns() { + [[ ${#DNS[@]} -gt 0 ]] || return 0 + # printf 'nameserver %s\n' "${DNS[@]}" | cmd resolvconf -a "tun.$INTERFACE" -m 0 -x + cmd networksetup -setdnsservers Wi-Fi empty + cmd networksetup -setdnsservers Wi-Fi "${DNS[@]}" + HAVE_SET_DNS=1 +} + +unset_dns() { + [[ ${#DNS[@]} -gt 0 ]] || return 0 + # cmd resolvconf -d "tun.$INTERFACE" + cmd networksetup -setdnsservers Wi-Fi empty +} + +add_route() { + [[ $TABLE != off ]] || return 0 + + if [[ -n $TABLE && $TABLE != auto ]]; then + cmd ip route add "$1" dev "$INTERFACE" table "$TABLE" + elif [[ $1 == */0 ]]; then + add_default "$1" + else + [[ $(ip route get "$i" 2>/dev/null) == *dev\ $INTERFACE\ * ]] || cmd ip route add "$1" dev "$INTERFACE" + fi +} + +DEFAULT_TABLE= +add_default() { + ip=$(ifconfig | grep -A 1 $INTERFACE | tail -1 | cut -d ' ' -f 2) + gateway=$(route get default | grep gateway | awk '{print $2}') + 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" endpoints) | sort -nr -k 2 -t /); do + endpoint=$(echo "$i" | cut -d ':' -f 1) + cmd route add -host "$endpoint" "$gateway" + done + cmd route add 0.0.0.0/1 $ip + cmd route add 128.0.0.0/1 $ip + return 0 +} + +set_config() { + cmd wg setconf "$INTERFACE" <(echo "$WG_CONFIG") +} + +save_config() { + local old_umask new_config current_config address cmd + [[ $(ip -all -brief address show dev "$INTERFACE") =~ ^$INTERFACE\ +\ [A-Z]+\ +(.+)$ ]] || true + new_config=$'[Interface]\n' + for address in ${BASH_REMATCH[1]}; do + new_config+="Address = $address"$'\n' + done + while read -r address; do + [[ $address =~ ^nameserver\ ([a-zA-Z0-9_=+:%.-]+)$ ]] && new_config+="DNS = ${BASH_REMATCH[1]}"$'\n' + done < <(resolvconf -l "tun.$INTERFACE" 2>/dev/null) + [[ -n $MTU && $(ip link show dev "$INTERFACE") =~ mtu\ ([0-9]+) ]] && new_config+="MTU = ${BASH_REMATCH[1]}"$'\n' + [[ -n $TABLE ]] && new_config+="Table = $TABLE"$'\n' + [[ $SAVE_CONFIG -eq 0 ]] || new_config+=$'SaveConfig = true\n' + for cmd in "${PRE_UP[@]}"; do + new_config+="PreUp = $cmd"$'\n' + done + for cmd in "${POST_UP[@]}"; do + new_config+="PostUp = $cmd"$'\n' + done + for cmd in "${PRE_DOWN[@]}"; do + new_config+="PreDown = $cmd"$'\n' + done + for cmd in "${POST_DOWN[@]}"; do + new_config+="PostDown = $cmd"$'\n' + done + old_umask="$(umask)" + umask 077 + current_config="$(cmd wg showconf "$INTERFACE")" + trap 'rm -f "$CONFIG_FILE.tmp"; exit' INT TERM EXIT + echo "${current_config/\[Interface\]$'\n'/$new_config}" > "$CONFIG_FILE.tmp" || die "Could not write configuration file" + sync "$CONFIG_FILE.tmp" + mv "$CONFIG_FILE.tmp" "$CONFIG_FILE" || die "Could not move configuration file" + trap - INT TERM EXIT + umask "$old_umask" +} + +execute_hooks() { + local hook + for hook in "$@"; do + hook="${hook//%i/$INTERFACE}" + echo "[#] $hook" >&2 + (eval "$hook") + done +} + +cmd_usage() { + cat >&2 <<-_EOF + Usage: $PROGRAM [ up | down | save ] [ 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 /etc/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. + - DNS: an optional DNS server to use while the device is up. + - MTU: an optional MTU for the interface; if unspecified, auto-calculated. + - Table: an optional routing table to which routes will be added; if + unspecified or \`auto', the default table is used. If \`off', no routes + are added. + - PreUp, PostUp, PreDown, PostDown: script snippets which will be executed + by bash(1) at the corresponding phases of the link, most commonly used + to configure DNS. The string \`%i' is expanded to INTERFACE. + - SaveConfig: if set to \`true', the configuration is saved from the current + state of the interface upon shutdown. + + See wg-quick(8) for more info and examples. + _EOF +} + +cmd_up() { + local i + [[ -z $(ip link show dev "$INTERFACE" 2>/dev/null) ]] || die "\`$INTERFACE' already exists" + trap 'del_if; exit' INT TERM EXIT + execute_hooks "${PRE_UP[@]}" + add_if + set_config + for i in "${ADDRESSES[@]}"; do + add_addr "$i" + done + set_mtu + up_if + set_dns + add_default # todo do routing correctly + # 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 + # add_route "$i" + # done + execute_hooks "${POST_UP[@]}" + trap - INT TERM EXIT +} + +cmd_down() { + [[ " $(wg show interfaces) " == *" $INTERFACE "* ]] || die "\`$INTERFACE' is not a WireGuard interface" + execute_hooks "${PRE_DOWN[@]}" + [[ $SAVE_CONFIG -eq 0 ]] || save_config + del_if + unset_dns + execute_hooks "${POST_DOWN[@]}" +} + +cmd_save() { + [[ " $(wg show interfaces) " == *" $INTERFACE "* ]] || die "\`$INTERFACE' is not a WireGuard interface" + save_config +} + +# ~~ function override insertion point ~~ + +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 +elif [[ $# -eq 2 && $1 == save ]]; then + auto_su + parse_options "$2" + cmd_save +else + cmd_usage + exit 1 +fi + +exit 0 |