Fix Subnet Validation

Author: krxkli

Android/app/build.gradle.kts

@@ -11,8 +11,8 @@ android {
         applicationId = "com.krxkli.scut_router"
         minSdk = 24
         targetSdk = 34
-        versionCode = 3
-        versionName = "1.1.1"
+        versionCode = 4
+        versionName = "1.1.2"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
 
@@ -63,6 +63,7 @@ dependencies {
     implementation(libs.androidx.preference)
     implementation(libs.androidx.activity)
     implementation(libs.androidx.legacy.support.v4)
+    implementation("commons-net:commons-net:3.11.1")
     testImplementation(libs.junit)
     androidTestImplementation(libs.androidx.junit)
     androidTestImplementation(libs.androidx.espresso.core)

Android/app/release/app-release.apk

@@ -11,8 +11,8 @@
       "type": "SINGLE",
       "filters": [],
       "attributes": [],
-      "versionCode": 3,
-      "versionName": "1.1.1",
+      "versionCode": 4,
+      "versionName": "1.1.2",
       "outputFile": "app-release.apk"
     }
   ],

Android/app/release/baselineProfiles/0/app-release.dm

@@ -17,6 +17,9 @@ import androidx.appcompat.app.AppCompatActivity
 import androidx.core.app.ActivityCompat
 import androidx.core.content.ContextCompat
 import com.example.scut_router.databinding.ActivityMainBinding
+import java.net.Inet4Address
+import java.net.NetworkInterface
+import org.apache.commons.net.util.SubnetUtils
 
 class MainActivity : AppCompatActivity() {
 
@@ -89,10 +92,26 @@ class MainActivity : AppCompatActivity() {
             Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).absolutePath
         initLibSSHCommand(downloadPath)
 
-        Toast.makeText(this, getString(R.string.core_loaded_successfully), Toast.LENGTH_SHORT).show()
+        Toast.makeText(this, getString(R.string.core_loaded_successfully), Toast.LENGTH_SHORT)
+            .show()
+    }
+
+    private fun htonl(value: Int): Int {
+        return (value shl 24) or
+                ((value and 0x00FF0000) shr 8) or
+                ((value and 0x0000FF00) shl 8) or
+                (value shr 24)
+    }
+
+    private fun ntohl(value: Int): Int {
+        return (value shl 24) or
+                ((value and 0x00FF0000) shr 8) or
+                ((value and 0x0000FF00) shl 8) or
+                (value shr 24)
     }
 
     private fun checkIsValidConn(): Boolean {
+        // 分析是否与 已知子网 吻合
         // 检查是否正确连接路由器
         val context: Context = this
         val wifiManager = context.getSystemService(Context.WIFI_SERVICE) as WifiManager
@@ -102,11 +121,33 @@ class MainActivity : AppCompatActivity() {
         val ipStr = Formatter.formatIpAddress(ipAddr)
         println("IP 地址： $ipStr")
 
-        if (ipStr != this.getString(R.string.default_router_conn)) {
-            return false
-        } else {
-            return true
+        val interfaces = NetworkInterface.getNetworkInterfaces()
+        while (interfaces.hasMoreElements()) {
+            val ifa = interfaces.nextElement()
+            if (!ifa.isUp || ifa.isLoopback) {
+                continue
+            }
+            if (ifa.name == getString(R.string.wlanIfaName)) {
+                val addresses = ifa.interfaceAddresses
+                for (addr in addresses) {
+                    if (addr.address is Inet4Address) {
+                        val prefixLen = addr.networkPrefixLength
+                        val subnetUtils = SubnetUtils("$ipStr/$prefixLen")
+                        val subNet = subnetUtils.info
+
+                        println("IP 子网: ${subNet.networkAddress}")
+
+                        if (subNet.networkAddress == this.getString(R.string.default_router_conn)) {
+                            return true
+                        } else {
+                            return false
+                        }
+                    }
+                }
+            }
         }
+
+        return false
     }
 
 

Android/app/release/baselineProfiles/1/app-release.dm

@@ -19,11 +19,12 @@
     <string name="gateway">gateway</string>
     <string name="dns_1" translatable="false">DNS 1</string>
     <string name="dns_2" translatable="false">DNS 2</string>
-    <string name="default_router_conn" translatable="false">192.168.0.101</string>
+    <string name="default_router_conn" translatable="false">192.168.0.0</string>
     <string name="validConnTitle">The router may not be connected</string>
     <string name="validConnMsg">Whether to exit the application</string>
     <string name="validConnYes">Yes</string>
     <string name="validConnNo">No</string>
     <string name="loadCore">Loading Core</string>
     <string name="core_loaded_successfully">Core Loaded successfully</string>
+    <string name="wlanIfaName" translatable="false">wlan0</string>
 </resources>