add FOREGROUND_SERVICE for no_tun mode, not using vpn service (#1203)

1. add FOREGROUND_SERVICE related code, connection not to be **blocked by android system** when apps running in background
2. no_tun mode not enabling vpnservice, makeing other app to use vpnservice

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

easytier-gui/src/composables/mobile_vpn.ts

@@ -115,6 +115,11 @@ function getRoutesForVpn(routes: Route[]): string[] {
 async function onNetworkInstanceChange() {
   console.error('vpn service watch network instance change ids', JSON.stringify(networkStore.networkInstanceIds))
   const insts = networkStore.networkInstanceIds
+  const no_tun = networkStore.isNoTunEnabled(insts[0])
+  if (no_tun) {
+    await doStopVpn()
+    return
+  }
   if (!insts) {
     await doStopVpn()
     return
@@ -132,14 +137,6 @@ async function onNetworkInstanceChange() {
     return
   }
 
-  // if use no tun mode, stop the vpn service
-  const no_tun = networkStore.isNoTunEnabled(insts[0])
-  if (no_tun) {
-    console.error('no tun mode, stop vpn service')
-    await doStopVpn()
-    return
-  }
-
   let network_length = curNetworkInfo?.my_node_info?.virtual_ipv4.network_length
   if (!network_length) {
     network_length = 24
@@ -187,12 +184,26 @@ async function watchNetworkInstance() {
   console.error('vpn service watch network instance')
 }
 
+function isNoTunEnabled(instanceId: string | undefined) {
+  if (!instanceId) {
+    return false
+  }
+  const no_tun = networkStore.isNoTunEnabled(instanceId)
+  if (no_tun) {
+    return true
+  }
+  return false
+}
+
 export async function initMobileVpnService() {
   await registerVpnServiceListener()
   await watchNetworkInstance()
 }
 
-export async function prepareVpnService() {
+export async function prepareVpnService(instanceId: string) {
+  if (isNoTunEnabled(instanceId)) {
+    return
+  }
   console.log('prepare vpn')
   const prepare_ret = await prepare_vpn()
   console.log('prepare vpn', JSON.stringify((prepare_ret)))

easytier-gui/src/pages/index.vue

@@ -102,7 +102,7 @@ networkStore.$subscribe(async () => {
 
 async function runNetworkCb(cfg: NetworkTypes.NetworkConfig, cb: () => void) {
   if (type() === 'android') {
-    await prepareVpnService()
+    await prepareVpnService(cfg.instance_id)
     networkStore.clearNetworkInstances()
   }
   else {