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wg-quick: remember to rewind DNS settings on failure 

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2017-10-26 22:49:46 +02:00
parent 17f9548182
commit 9bcb48eacd
1 changed files with 8 additions and 3 deletions
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11
src/wg-quick.bash
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@ -83,6 +83,7 @@ add_if() {
del_if() {
local fwmark
[[ $HAVE_SET_DNS -eq 0 ]] || unset_dns
fwmark="$(wg show "$INTERFACE" fwmark)"
DEFAULT_TABLE=0
[[ $fwmark != off ]] && DEFAULT_TABLE=$(( fwmark ))
@ -130,12 +131,16 @@ set_mtu() {
cmd ip link set mtu $(( mtu - 80 )) dev "$INTERFACE"
}
HAVE_SET_DNS=0
set_dns() {
[[ ${#DNS[@]} -eq 0 ]] || printf 'nameserver %s\n' "${DNS[@]}" | cmd resolvconf -a "tun.$INTERFACE" -m 0 -x
[[ ${#DNS[@]} -gt 0 ]] || return 0
printf 'nameserver %s\n' "${DNS[@]}" | cmd resolvconf -a "tun.$INTERFACE" -m 0 -x
HAVE_SET_DNS=1
}
unset_dns() {
[[ ${#DNS[@]} -eq 0 ]] || cmd resolvconf -d "tun.$INTERFACE"
[[ ${#DNS[@]} -gt 0 ]] || return 0
cmd resolvconf -d "tun.$INTERFACE"
}
add_route() {
@ -254,8 +259,8 @@ cmd_down() {
[[ " $(wg show interfaces) " == *" $INTERFACE "* ]] || die "\`$INTERFACE' is not a WireGuard interface"
execute_hooks "${PRE_DOWN[@]}"
[[ $SAVE_CONFIG -eq 0 ]] || save_config
unset_dns
del_if
unset_dns
execute_hooks "${POST_DOWN[@]}"
}