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Use Random Port Selection to Bypass Locked Default VPN Port on Windows #267

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Use Random Port Selection to Bypass Locked Default VPN Port on Windows #267

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2f094f3
Choose random free SSH port for GVPROXY
al-kuznetsov Aug 21, 2024
1d7c2a0
Replace the "next port" algorithm with a random port assignment strat…
JuenTingShie Feb 11, 2025
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23 changes: 22 additions & 1 deletion wsl-vpnkit
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Original file line number Diff line number Diff line change
Expand Up @@ -41,10 +41,31 @@ fi
# replace calls to iptables if iptables-legacy exists
command -v iptables-legacy >/dev/null && alias iptables=iptables-legacy

# Choose random free SSH port for GVPROXY by default
get_random_port() {
# Random the range
min=49152
max=65535

# Keep looping until finded usable port
while true; do
port=$(shuf -i $min-$max -n 1)

# Check if port is been using
if ! ss -tan4H | grep -qE "LISTEN.*:$port\b"; then
break
fi
done

echo "$port"
}

run () {
echo "starting vm and gvproxy..."
PORT=$(get_random_port)
echo "using port: $PORT"
$VMEXEC_PATH \
-url="stdio:$GVPROXY_PATH?listen-stdio=accept&debug=$DEBUG" \
-url="stdio:$GVPROXY_PATH?listen-stdio=accept&ssh-port=$PORT&debug=$DEBUG" \
-iface="$TAP_NAME" \
-stop-if-exist="" \
-preexisting=1 \
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