From 95f99f52683235606fdc8ce69eafda384017d8f0 Mon Sep 17 00:00:00 2001
From: Arpit Chakladar <arpitchakladar+git@gmail.com>
Date: Tue, 28 Jul 2026 23:49:54 +0530
Subject: fix(usque-warp): fixed connect and disconnect options

- Previously if the system reboots before disconnect is ran the PID file
lingers and prevented running on the next boot.
- Disconnect replaced the tun0 redirect in ip route to the previous
default route which caused duplicate routes
- disconnect didn't run kill for the usque process with sudo and thus it
failed to kill the process
---
 modules/scripts/usque-warp/script.sh | 115 ++++++++++++++++++++++++++++-------
 1 file changed, 92 insertions(+), 23 deletions(-)

diff --git a/modules/scripts/usque-warp/script.sh b/modules/scripts/usque-warp/script.sh
index 9dc735a..43c89a2 100644
--- a/modules/scripts/usque-warp/script.sh
+++ b/modules/scripts/usque-warp/script.sh
@@ -1,12 +1,15 @@
+#!/usr/bin/env bash
 set -euo pipefail
 
 CONFIG_DIR="$HOME/.cache/usque"
 CONFIG="$CONFIG_DIR/config.json"
 
 TUN_DEV="tun0"
-PID_FILE="/tmp/usque-warp.pid"
-STATE_FILE="/tmp/usque-warp.state"
-LOG_FILE="/tmp/usque-warp.log"
+
+RUNTIME_DIR="${XDG_RUNTIME_DIR:-/tmp}"
+PID_FILE="$RUNTIME_DIR/usque-warp.pid"
+STATE_FILE="$RUNTIME_DIR/usque-warp.state"
+LOG_FILE="$RUNTIME_DIR/usque-warp.log"
 
 
 ensure_config() {
@@ -34,19 +37,51 @@ ensure_config() {
 }
 
 
+remove_tun_default_routes() {
+  while ip route show | grep -qE "^default .*dev $TUN_DEV"; do
+    ROUTE=$(ip route show | grep -E "^default .*dev $TUN_DEV" | head -n1)
+
+    echo "Removing route: $ROUTE"
+
+    sudo ip route del $ROUTE || true
+  done
+}
+
+
 connect() {
   ensure_config
 
   if [[ -f "$PID_FILE" ]]; then
-    echo "usque-warp is already running"
+    OLD_PID=$(cat "$PID_FILE")
+
+    if kill -0 "$OLD_PID" 2>/dev/null; then
+      echo "usque-warp is already running (PID $OLD_PID)"
+      exit 1
+    else
+      echo "Removing stale PID file..."
+      rm -f "$PID_FILE"
+    fi
+  fi
+
+
+  echo "Saving current default route..."
+
+  DEFAULT_ROUTE=$(ip route show default | grep -v "dev $TUN_DEV" | head -n1)
+
+  if [[ -z "$DEFAULT_ROUTE" ]]; then
+    echo "Could not determine current default route"
     exit 1
   fi
 
+  echo "$DEFAULT_ROUTE" > "$STATE_FILE"
+
+
   echo "Starting usque..."
 
   sudo usque nativetun -c "$CONFIG" >"$LOG_FILE" 2>&1 &
   echo $! > "$PID_FILE"
 
+
   echo "Waiting for MASQUE connection..."
 
   MASQUE_IP=""
@@ -55,36 +90,53 @@ connect() {
     MASQUE_IP=$(grep -oP 'MASQUE connection to \K[0-9.]+(?=:443)' "$LOG_FILE" 2>/dev/null || true)
 
     if [[ -n "$MASQUE_IP" ]]; then
-        break
+      break
     fi
 
     sleep 1
-done
+  done
+
 
   if [[ -z "$MASQUE_IP" ]]; then
     echo "Failed to detect MASQUE endpoint"
-    kill "$(cat "$PID_FILE")" || true
-    rm "$PID_FILE"
+
+    kill "$(cat "$PID_FILE")" 2>/dev/null || true
+    rm -f "$PID_FILE"
+
     exit 1
   fi
 
-  DEFAULT_ROUTE=$(ip route show default | head -n1)
 
   GATEWAY=$(echo "$DEFAULT_ROUTE" | awk '{for(i=1;i<=NF;i++) if($i=="via") print $(i+1)}')
   INTERFACE=$(echo "$DEFAULT_ROUTE" | awk '{for(i=1;i<=NF;i++) if($i=="dev") print $(i+1)}')
 
+
   if [[ -z "$GATEWAY" || -z "$INTERFACE" ]]; then
-    echo "Cannot determine gateway"
+    echo "Cannot determine gateway/interface"
     exit 1
   fi
 
-  echo "$GATEWAY $INTERFACE $MASQUE_IP" > "$STATE_FILE"
+
+  echo "$MASQUE_IP $GATEWAY $INTERFACE" >> "$STATE_FILE"
+
 
   echo "Allowing MASQUE endpoint outside tunnel..."
-  sudo ip route replace "$MASQUE_IP" via "$GATEWAY" dev "$INTERFACE"
+
+  sudo ip route replace \
+    "$MASQUE_IP" \
+    via "$GATEWAY" \
+    dev "$INTERFACE"
+
+
+  echo "Removing old tun routes..."
+
+  remove_tun_default_routes
+
 
   echo "Switching default route to tun0..."
-  sudo ip route replace default dev "$TUN_DEV" metric 1
+
+  sudo ip route add default dev "$TUN_DEV" metric 1
+
 
   echo "Connected"
 }
@@ -93,24 +145,39 @@ done
 disconnect() {
   echo "Disconnecting..."
 
-  if [[ -f "$STATE_FILE" ]]; then
-    read GATEWAY INTERFACE MASQUE_IP < "$STATE_FILE"
+  echo "Removing tun routes..."
+
+  while ip route show | grep -qE "^default .*dev $TUN_DEV"; do
+    ROUTE=$(ip route show | grep -E "^default .*dev $TUN_DEV" | head -n1)
+
+    echo "Removing route: $ROUTE"
+
+    sudo ip route del $ROUTE || true
+  done
 
-    echo "Restoring normal route..."
 
-    sudo ip route replace default via "$GATEWAY" dev "$INTERFACE"
+  if [[ -f "$STATE_FILE" ]]; then
+    MASQUE_IP=$(grep -oP '[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+' "$STATE_FILE" | head -n1 || true)
 
-    sudo ip route del "$MASQUE_IP" 2>/dev/null || true
+    if [[ -n "$MASQUE_IP" ]]; then
+        echo "Removing MASQUE route: $MASQUE_IP"
+        sudo ip route del "$MASQUE_IP" 2>/dev/null || true
+    fi
 
-    rm "$STATE_FILE"
+    rm -f "$STATE_FILE"
   fi
 
+
   if [[ -f "$PID_FILE" ]]; then
-    kill "$(cat "$PID_FILE")" 2>/dev/null || true
-    rm "$PID_FILE"
-  fi
+    PID=$(cat "$PID_FILE")
 
-  sudo ip route del default dev "$TUN_DEV" 2>/dev/null || true
+    if kill -0 "$PID" 2>/dev/null; then
+        echo "Stopping usque..."
+        sudo kill "$PID" 2>/dev/null || true
+    fi
+
+    rm -f "$PID_FILE"
+  fi
 
   echo "Disconnected"
 }
@@ -120,9 +187,11 @@ case "${1:-}" in
   connect)
     connect
     ;;
+
   disconnect)
     disconnect
     ;;
+
   *)
     echo "Usage: $0 {connect|disconnect}"
     exit 1
-- 
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