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wg-quick: darwin: set DNS servers after delay on route change

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This works around a race condition in macOS's network daemons, while
also adding one in the form of possibly calling kill -ALRM on a stale
PID; unfortunately bash can't wait from a trap.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2018-05-30 01:37:57 +02:00
parent d532074ef5
commit 206e8f08e2
1 changed files with 6 additions and 2 deletions
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8
src/wg-quick/darwin.bash
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@ -293,7 +293,8 @@ monitor_daemon() {
echo "[+] Backgrounding route monitor" >&2
(trap 'del_routes; del_dns; exit 0' INT TERM EXIT
exec >/dev/null 2>&1
local event
local event pid=$BASHPID
[[ ${#DNS[@]} -gt 0 ]] && trap set_dns ALRM
# TODO: this should also check to see if the endpoint actually changes
# in response to incoming packets, and then call set_endpoint_direct_route
# then too. That function should be able to gracefully cleanup if the
@ -303,7 +304,10 @@ monitor_daemon() {
ifconfig "$REAL_INTERFACE" >/dev/null 2>&1 || break
[[ $AUTO_ROUTE4 -eq 1 || $AUTO_ROUTE6 -eq 1 ]] && set_endpoint_direct_route
[[ -z $MTU ]] && set_mtu
[[ ${#DNS[@]} -gt 0 ]] && set_dns
if [[ ${#DNS[@]} -gt 0 ]]; then
set_dns
sleep 2 && kill -ALRM $pid 2>/dev/null &
fi
done < <(route -n monitor)) & disown
}