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set_dns() {
[[ ${#DNS[@]} -gt 0 ]] || return 0
if [[ $(resolvconf --version 2>/dev/null) == openresolv\ * ]]; then
printf 'nameserver %s\n' "${DNS[@]}" | cmd resolvconf -a "$INTERFACE" -m 0 -x
else
echo "[#] mount \`${DNS[*]}' /etc/resolv.conf" >&2
[[ -e /etc/resolv.conf ]] || touch /etc/resolv.conf
{ cat <<-_EOF
# This file was generated by wg-quick(8) for use with
# the WireGuard interface $INTERFACE. It cannot be
# removed or altered directly. You may remove this file
# by running \`wg-quick down $INTERFACE', or if that
# poses problems, run \`umount /etc/resolv.conf'.
_EOF
printf 'nameserver %s\n' "${DNS[@]}"
} | unshare -m --propagation shared bash -c "$(cat <<-_EOF
set -e
mount --make-private /dev/shm
mount -t tmpfs none /dev/shm
cat > /dev/shm/resolv.conf
mount -o remount,ro /dev/shm
mount -o bind,ro /dev/shm/resolv.conf /etc/resolv.conf
_EOF
)"
fi
HAVE_SET_DNS=1
}
unset_dns() {
[[ ${#DNS[@]} -gt 0 ]] || return 0
if [[ $(resolvconf --version 2>/dev/null) == openresolv\ * ]]; then
cmd resolvconf -d "$INTERFACE"
else
cmd umount /etc/resolv.conf
fi
}
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