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|
#!/bin/bash
set -e -o pipefail
export PATH="$(dirname "$(readlink -f "$0")"):$PATH"
cmd() {
echo "[#] $*" >&2
"$@"
}
auto_su() {
[[ $UID != 0 ]] && exec sudo -p "$PROGRAM must be run as root. Please enter the password for %u to continue: " "$(readlink -f "$0")" "${ARGS[@]}" || true
}
unwind() {
set +e
[[ -n $INTERFACE && -n $(ip link show dev "$INTERFACE" type wireguard 2>/dev/null) ]] && cmd ip link delete dev "$INTERFACE"
exit
}
add_if() {
ip link delete dev "$INTERFACE" 2>/dev/null || true
cmd ip link add "$INTERFACE" type wireguard
}
del_if() {
[[ -n $(ip link show dev "$INTERFACE" type wireguard 2>/dev/null) ]] || { echo "$PROGRAM: \`$INTERFACE' is not a WireGuard interface" >&2; exit 1; }
cmd ip link delete dev "$INTERFACE"
}
up_if() {
cmd ip link set "$INTERFACE" up
}
add_addr() {
cmd ip address add "$1" dev "$INTERFACE"
}
add_route() {
cmd ip route add "$1" dev "$INTERFACE"
}
add_default() {
if [[ $1 == ::/0 ]]; then
echo "tungate: does not yet support IPv6, skipping ::/0" >&2
return 0
elif [[ $1 == 0.0.0.0/0 ]]; then
local endpoint="$(join <(wg show "$INTERFACE" allowed-ips) <(wg show "$INTERFACE" endpoints) | sed -n 's/.* 0\.0\.0\.0\/0.* \([0-9.:\/a-z]\+\):[0-9]\+$/\1/p')"
add_route 0/1
add_route 128/1
killall tungate 2>/dev/null || true
echo "[&] Forking \`tungate' for $endpoint to background" >&2
tungate "$endpoint" >/dev/null 2>&1 & disown
return 0
fi
return 1
}
set_config() {
if [[ -n $CONFIG_FILE_CONTENTS ]]; then
cmd wg setconf "$INTERFACE" <(echo "$CONFIG_FILE_CONTENTS")
else
cmd wg setconf "$INTERFACE" "$CONFIG_FILE"
fi
}
save_config() {
local old_umask="$(umask)"
umask 077
cmd wg showconf "$INTERFACE" > "$CONFIG_FILE.tmp" || { rm -f "$CONFIG_FILE.tmp"; exit 1; }
mv "$CONFIG_FILE.tmp" "$CONFIG_FILE" || { rm -f "$CONFIG_FILE.tmp"; exit 1; }
umask "$old_umask"
}
cmd_usage() {
cat >&2 <<-_EOF
Usage: $PROGRAM [ add | del ] INTERFACE [arguments...]
$PROGRAM add INTERFACE --config=CONFIG_FILE [--address=ADDRESS/CIDR...]
[--route=ROUTE/CIDR...] [--no-auto-route-from-allowed-ips]
[--env-file=ENV_FILE]
The add subcommand adds a new WireGuard interface, INTERFACE, replacing
any existing interfaces of the same name. The --config argument is
required, and its argument is passed to wg(8)'s setconf subcommand. The
--address argument(s) is recommended for this utility to be useful. The
--route argument is purely optional, as by default this utility will
automatically add routes implied by --address and as implied by the
allowed-ip entries inside the --config file. To disable this automatic
route adding, you may use the option entitled --no-auto-route-from-allowed-ips.
$PROGRAM del INTERFACE [--config=CONFIG_FILE_TO_SAVE] [--env-file=ENV_FILE]
The del subcommand removes an existing WireGuard interface. If the
optional --config is specified, then the existing configuration is
written out to the file specified, via wg(8)'s showconf subcommand.
$PROGRAM help
Show this message.
Both \`add' and ``del' take the --env-file=ENV_FILE option. If specified,
the contents of ENV_FILE are imported into $PROGRAM. This can be used to
set variables in a file, instead of needing to pass them on the command
line. The following table shows the relation between the command line
options described above, and variables that may be declared in ENV_FILE:
--address=A, --address=B, --address=C ADDRESSES=( "A" "B" "C" )
--route=A, --route=B, --route=C ADDITIONAL_ROUTES=( "A" "B" "C" )
--config-file=F CONFIG_FILE="F"
echo C > /tmp/F, --config-file=/tmp/F CONFIG_FILE_CONTENTS="C"
--no-auto-route-from-allowed-ips AUTO_ROUTE=0
Additionally, ENV_FILE may define the bash functions pre_add, post_add,
pre_del, and post_del, which will be called at their respective times.
_EOF
}
cmd_add() {
local i
[[ -n $CONFIG_FILE || -n $CONFIG_FILE_CONTENTS ]] || { echo "$PROGRAM: --config is required for add subcommand" >&2; exit 1; }
auto_su
trap unwind INT TERM EXIT
[[ $(type -t pre_add) == function ]] && pre_add || true
add_if
set_config
for i in "${ADDRESSES[@]}"; do
add_addr "$i"
done
up_if
if [[ $AUTO_ROUTE -eq 1 ]]; then
for i in $(wg show "$INTERFACE" allowed-ips | grep -Po '(?<=[\t ])[0-9.:/a-z]+' | sort -nr -k 2 -t /); do
if ! add_default "$i" && [[ $(ip route get "$i") != *dev\ $INTERFACE\ * ]]; then
add_route "$i"
fi
done
fi
for i in "${ADDITIONAL_ROUTES[@]}"; do
if ! add_default "$i"; then
add_route "$i"
fi
done
[[ $(type -t post_add) == function ]] && post_add || true
trap - INT TERM EXIT
}
cmd_del() {
auto_su
[[ $(type -t pre_del) == function ]] && pre_del || true
killall tungate 2>/dev/null || true
[[ -n $CONFIG_FILE ]] && save_config
del_if
[[ $(type -t post_del) == function ]] && post_del || true
}
declare INTERFACE="$2"
declare SUBCOMMAND="$1"
declare -a ADDRESSES
declare -a ADDITIONAL_ROUTES
declare AUTO_ROUTE=1
declare CONFIG_FILE
declare CONFIG_FILE_CONTENTS
declare PROGRAM="${0##*/}"
declare -a ARGS=( "$@" )
[[ -n $INTERFACE && -n $SUBCOMMAND ]] || { cmd_usage; exit 1; }
shift 2
for arg; do
case "$arg" in
--env-file=*) source "${arg#*=}" ;;
--config=*) CONFIG_FILE="${arg#*=}" ;;
--address=*) ADDRESSES+=( ${arg#*=} ) ;;
--route=*) ADDITIONAL_ROUTES+=( ${arg#*=} ) ;;
--no-auto-route-from-allowed-ips) AUTO_ROUTE=0 ;;
*) cmd_usage; exit 1 ;;
esac
done
case "$SUBCOMMAND" in
add) cmd_add ;;
del) cmd_del ;;
*) cmd_usage; exit 1 ;;
esac
exit 0
|
