Refactor WireGuard entrypoint script to capture and restore original default route and gateway. Introduce wg_up_manual function for improved tunnel setup, replacing previous wg-quick commands.

Dockers/pia-wireguard/entrypoint.sh

@@ -21,6 +21,9 @@ pf_pid=""
 current_region=""
 current_wg_ip=""
 current_wg_cn=""
+orig_default_route=""
+orig_default_gw=""
+orig_default_dev=""
 
 cleanup() {
   set +e
@@ -32,7 +35,10 @@ cleanup() {
   iptables -D OUTPUT -j PIA_KILLSWITCH 2>/dev/null || true
   iptables -F PIA_KILLSWITCH 2>/dev/null || true
   iptables -X PIA_KILLSWITCH 2>/dev/null || true
-  wg-quick down "$PIA_IFACE" 2>/dev/null || true
+  ip link del "$PIA_IFACE" 2>/dev/null || true
+  if [[ -n "${orig_default_route:-}" ]]; then
+    ip route replace $orig_default_route 2>/dev/null || true
+  fi
 }
 
 trap cleanup EXIT INT TERM
@@ -73,6 +79,45 @@ setup_killswitch() {
   iptables -C OUTPUT -j PIA_KILLSWITCH 2>/dev/null || iptables -I OUTPUT 1 -j PIA_KILLSWITCH
 }
 
+capture_default_route() {
+  # Save original default route so we can restore on exit/reconnect.
+  if [[ -n "${orig_default_route:-}" ]]; then
+    return
+  fi
+  orig_default_route="$(ip -4 route show default | head -n1 || true)"
+  orig_default_gw="$(awk '{for (i=1;i<=NF;i++) if ($i=="via") print $(i+1)}' <<<"$orig_default_route")"
+  orig_default_dev="$(awk '{for (i=1;i<=NF;i++) if ($i=="dev") print $(i+1)}' <<<"$orig_default_route")"
+}
+
+wg_up_manual() {
+  local iface="$1"
+  local addr="$2"
+  local privkey="$3"
+  local endpoint_ip="$4"
+  local endpoint_port="$5"
+  local server_pubkey="$6"
+
+  capture_default_route
+  if [[ -z "${orig_default_gw:-}" || -z "${orig_default_dev:-}" ]]; then
+    >&2 echo "Could not determine original default gateway/device."
+    return 1
+  fi
+
+  ip link del "$iface" 2>/dev/null || true
+  ip link add "$iface" type wireguard
+  ip -4 address add "$addr" dev "$iface"
+  ip link set mtu 1420 up dev "$iface"
+
+  wg set "$iface" private-key <(printf '%s' "$privkey")
+  wg set "$iface" peer "$server_pubkey" persistent-keepalive 25 allowed-ips 0.0.0.0/0 endpoint "${endpoint_ip}:${endpoint_port}"
+
+  # Ensure endpoint traffic keeps going out via the original gateway.
+  ip -4 route replace "${endpoint_ip}/32" via "$orig_default_gw" dev "$orig_default_dev"
+
+  # Route all egress through the tunnel (main table; avoids wg-quick sysctl/policy routing).
+  ip -4 route replace default dev "$iface"
+}
+
 is_tunnel_healthy() {
   if ! wg show "$PIA_IFACE" >/dev/null 2>&1; then
     return 1
@@ -180,21 +225,7 @@ connect_region() {
     write_resolv_conf "$PIA_DNS_PRE_VPN"
   fi
 
-  mkdir -p /etc/wireguard
-  cat >"/etc/wireguard/${PIA_IFACE}.conf" <<EOF
-[Interface]
-Address = ${peer_ip}
-PrivateKey = ${privKey}
-
-[Peer]
-PersistentKeepalive = 25
-PublicKey = ${server_key}
-AllowedIPs = 0.0.0.0/0
-Endpoint = ${wg_ip}:${server_port}
-EOF
-
-  wg-quick down "$PIA_IFACE" 2>/dev/null || true
-  wg-quick up "$PIA_IFACE"
+  wg_up_manual "$PIA_IFACE" "$peer_ip" "$privKey" "$wg_ip" "$server_port" "$server_key"
 
   if [[ "$PIA_DNS_ENABLE" == "true" ]]; then
     write_resolv_conf "$dns_server"