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Choose random free SSH port for GVPROXY #266

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Choose random free SSH port for GVPROXY #266

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17 changes: 16 additions & 1 deletion wsl-vpnkit
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Original file line number Diff line number Diff line change
Expand Up @@ -41,10 +41,25 @@ 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() {
# starting from BASE_PORT with INCREMENT step
BASE_PORT=2222 # the default SSH port chosen if free
INCREMENT=1

port=$BASE_PORT

while [ -n "$(ss -tan4H "sport = $port")" ]; do
port=$((port+INCREMENT))
done

echo "$port"
}

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