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wg-quick: darwin: properly parse netstat -nr output

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Looking at the source [1], it appears that the interface is always the
4th argument, regardless of the family:

C1.	if (fam != old_fam) // FALSE

P1.	p_sockaddr(params, &addr.u_sa, &mask.u_sa, rtm->rtm_flags,
	    WID_DST(addr.u_sa.sa_family));

P2.	p_sockaddr(params, rti_info[RTAX_GATEWAY], NULL, RTF_HOST,
	    WID_GW(addr.u_sa.sa_family));

C2.	if (params->lflag && (rtm->rtm_addrs & RTA_IFA)) // FALSE

P3.	p_flags(rtm->rtm_flags, "%-10.10s ");

C3.	if (params->lflag) // FALSE

P4. 	printf("%*.*s", WID_IF(addr.u_sa.sa_family),
		WID_IF(addr.u_sa.sa_family), ifname);

Because C1, C2, and C3 evaluate to false, interface is always in the 4th
argument.

[1] 97e27e6244/netstat.tproj/route.c (L328)

Reported-by: Florian Uekermann <florian@uekermann.me>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2026-05-06 23:21:24 +02:00
parent 025f00454f
commit a998407747
1 changed files with 3 additions and 3 deletions
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6
src/wg-quick/darwin.bash
View file

@ -131,14 +131,14 @@ add_if() {
del_routes() {
[[ -n $REAL_INTERFACE ]] || return 0
local todelete=( ) destination gateway netif
while read -r destination _ _ _ _ netif _; do
while read -r destination _ _ netif _; do
[[ $netif == "$REAL_INTERFACE" ]] && todelete+=( "$destination" )
done < <(netstat -nr -f inet)
for destination in "${todelete[@]}"; do
cmd route -q -n delete -inet "$destination" >/dev/null || true
done
todelete=( )
while read -r destination gateway _ netif; do
while read -r destination gateway _ netif _; do
[[ $netif == "$REAL_INTERFACE" || ( $netif == lo* && $gateway == "$REAL_INTERFACE" ) ]] && todelete+=( "$destination" )
done < <(netstat -nr -f inet6)
for destination in "${todelete[@]}"; do
@ -177,7 +177,7 @@ set_mtu() {
cmd ifconfig "$REAL_INTERFACE" mtu "$MTU"
return
fi
while read -r destination _ _ _ _ netif _; do
while read -r destination _ _ netif _; do
if [[ $destination == default ]]; then
defaultif="$netif"
break