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|
#!/usr/bin/env bash
#
# Copyright 2026 David Vazgenovich Shakaryan
die() {
printf '%s\n' "${0##*/}: $*" >&2
exit 1
}
[[ -n "${SUDO_USER}" ]] || die 'SUDO_USER is not set'
run() {
if [[ -t 1 ]]; then
printf '\e[90m[*] %s\e[0m\n' "$*"
else
printf '[*] %s\n' "$*"
fi
"$@"
}
wg_conf=
netns=
enable_tap=
tap_addrs=()
dnat_rules=()
while (($#)); do
case "$1" in
-c|--config)
wg_conf="${2}"
shift 2 ;;
-n|--netns)
netns="${2}"
shift 2 ;;
--tap)
enable_tap=1
shift ;;
--tap-addr)
tap_addrs+=("${2}")
shift 2 ;;
--dnat)
dnat_rules+=("${2}")
shift 2 ;;
--)
shift
break ;;
-*)
die "invalid option: ${1}" ;;
*)
break ;;
esac
done
: ${wg_conf:=default}
[[ "${wg_conf}" =~ ^[A-Za-z0-9+.=_-]{1,15}$ ]] &&
wg_conf="/etc/wg-netns-exec/${wg_conf}.conf"
[[ -e "${wg_conf}" ]] || die "config file does not exist: ${wg_conf}"
echo "config: $wg_conf"
: ${netns:=$(LC_ALL=C tr -dc 'a-z0-9' < /dev/urandom | head -c 8)}
wg_if="wg-${netns}"
((!${#tap_addrs[@]})) && tap_addrs=(10.0.0.1/32 fd00::1/64)
def_daddr=
def_daddr6=
for addr in "${tap_addrs[@]}"; do
addr="${addr%%/*}"
if [[ "${addr}" == *:* ]]; then
[[ -z "${def_daddr6}" ]] && def_daddr6="${addr%:1}:2" &&
[[ -n "${def_daddr}" ]] && break
else
[[ -z "${def_daddr}" ]] && def_daddr="${addr%.1}.2" &&
[[ -n "${def_daddr6}" ]] && break
fi
done
run ip netns del "${netns}" 2>/dev/null
run ip netns add "${netns}"
trap 'run ip netns del "${netns}"' EXIT
run ip link add "${wg_if}" type wireguard
run ip link set "${wg_if}" netns "${netns}"
for i in $(awk '
/^\[Interface\]$/ { m = 1; next } /^\[/ { m = 0 }
m && sub(/^Address\s*=\s*/, "") {
gsub(/,\s*/, "\n"); print }
' "${wg_conf}"); do
run ip -n "${netns}" addr add "${i}" dev "${wg_if}"
done
run ip netns exec "${netns}" wg setconf "${wg_if}" <(
wg-quick strip "${wg_conf}")
run ip -n "${netns}" link set "${wg_if}" up
run ip -n "${netns}" -4 route add default dev "${wg_if}"
run ip -n "${netns}" -6 route add default dev "${wg_if}"
run ip netns exec "${netns}" curl -s4 -m 10 ifconfig.co
run ip netns exec "${netns}" curl -s6 -m 10 ifconfig.co
if ((enable_tap)); then
run ip netns exec "${netns}" ip tuntap add dev tap0 mode tap user \
"${SUDO_USER}"
run ip netns exec "${netns}" ip link set tap0 up
for addr in "${tap_addrs[@]}"; do
run ip netns exec "${netns}" ip addr add "${addr}" dev tap0
done
run ip netns exec "${netns}" sysctl -wq net.ipv4.conf.all.forwarding=1
run ip netns exec "${netns}" sysctl -wq net.ipv6.conf.all.forwarding=1
pre=
if ((${#dnat_rules[@]})); then
pre='chain prerouting {
type nat hook prerouting priority dstnat
policy accept'
for saddr in "${dnat_rules[@]}"; do
sport= proto= daddr= dport=
if [[ "${saddr}" =~ ^((.*)\ +)?to\ +(.*) ]]; then
saddr="${BASH_REMATCH[2]}"
daddr="${BASH_REMATCH[3]}"
fi
ip_re='(([^:]*\[[^]]*\]([^:]*\[[^]]*\])*)?[^:]*)'
[[ "${saddr}" =~ ^\ *any\ *(/.*)?$ ]] &&
saddr=":${BASH_REMATCH[1]}"
[[ "${saddr}" =~ ^${ip_re}:?([^/]*)/?(.*) ]]
saddr="${BASH_REMATCH[1]}"
sport="${BASH_REMATCH[4]}"
proto="${BASH_REMATCH[5]}"
if [[ -n "${daddr}" ]]; then
[[ "${daddr}" =~ ^${ip_re}:?(.*) ]]
daddr="${BASH_REMATCH[1]}"
dport="${BASH_REMATCH[4]}"
fi
[[ "${saddr}" == *:* || "${daddr}" == *:* ]] &&
ip6=1 || ip6=
r="iifname ${wg_if}"
[[ -n "${saddr}" ]] && r+=" ip${ip6:+6} saddr ${saddr}"
[[ -n "${sport}" || -n "${dport}" ||
-n "${proto}" ]] &&
r+=" meta l4proto {${proto:-tcp}}"
[[ -n "${sport}" ]] && r+=" th dport ${sport}"
dport="${dport:+:${dport}}"
((!ip6)) &&
d="${daddr:-${def_daddr}}" &&
[[ -n "${d}" ]] &&
pre+=$'\n'"${r} dnat ip to ${d}${dport}"
((ip6)) || [[ -z "${saddr}" && -z "${daddr}" ]] &&
d="${daddr:-${def_daddr6}}" &&
[[ -n "${d}" ]] &&
pre+=$'\n'"${r} dnat ip6 to ${d}${dport}"
done
pre+=$'\n}'
fi
run ip netns exec "${netns}" nft -f - <<-EOF
table inet nat {
${pre}
chain postrouting {
type nat hook postrouting priority srcnat
policy accept
oifname ${wg_if} masquerade
}
}
EOF
run ip netns exec "${netns}" nft list ruleset
fi
(($#)) || set -- sleep infinity
run ip netns exec "${netns}" sudo -u "${SUDO_USER}" "$@"
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