Failed DoH requests are now logged

Implements #142

app/build.gradle

@@ -107,7 +107,7 @@ dependencies {
 
     implementation 'com.frostnerd.utilskt:preferences:1.5.14' // https://git.frostnerd.com/AndroidUtils/preferenceskt (Accessible after logging in [free of charge])
     implementation 'com.frostnerd.utilskt:navigationdraweractivity:1.3.19' // https://git.frostnerd.com/AndroidUtils/navigationdraweractivity (Accessible after logging in [free of charge])
-    implementation 'com.frostnerd.utilskt:encrypteddnstunnelproxy:1.5.134' // https://git.frostnerd.com/AndroidUtils/encrypteddnstunnelproxy
+    implementation 'com.frostnerd.utilskt:encrypteddnstunnelproxy:1.5.135' // https://git.frostnerd.com/AndroidUtils/encrypteddnstunnelproxy
     implementation 'com.frostnerd.utilskt:general:1.0.16' // https://git.frostnerd.com/AndroidUtils/generalkt (Accessible after logging in [free of charge])
     implementation 'com.frostnerd.utilskt:adapters:1.1.1' // https://git.frostnerd.com/AndroidUtils/Adapters (Accessible after logging in [free of charge])
 

app/src/main/java/com/frostnerd/smokescreen/service/DnsVpnService.kt

@@ -36,6 +36,7 @@ import com.frostnerd.smokescreen.util.proxy.ProxyBypassHandler
 import com.frostnerd.smokescreen.util.proxy.ProxyHttpsHandler
 import com.frostnerd.smokescreen.util.proxy.ProxyTlsHandler
 import com.frostnerd.smokescreen.util.proxy.SmokeProxy
+import com.frostnerd.vpntunnelproxy.FutureAnswer
 import com.frostnerd.vpntunnelproxy.TrafficStats
 import com.frostnerd.vpntunnelproxy.VPNTunnelProxy
 import kotlinx.coroutines.*
@@ -783,6 +784,10 @@ class DnsVpnService : VpnService(), Runnable {
         log("DnsProxy created, creating VPN proxy")
         vpnProxy = VPNTunnelProxy(dnsProxy!!, vpnService = this, coroutineScope = CoroutineScope(
             newFixedThreadPoolContext(2, "proxy-pool")), logger = object:com.frostnerd.vpntunnelproxy.Logger() {
+            override fun failedRequest(question: FutureAnswer, reason: Throwable?) {
+                if(reason != null) log("A request failed: " + Logger.stacktraceToString(reason), "VPN-LIBRARY")
+            }
+
             val advancedLogging = getPreferences().advancedLogging
             override fun logException(ex: Exception, terminal: Boolean, level: Level) {
                 if(terminal) log(ex)

app/src/main/java/com/frostnerd/smokescreen/util/proxy/ProxyBypassHandler.kt

@@ -59,7 +59,7 @@ class ProxyBypassHandler(private val searchDomains:List<String>, private val des
         return true
     }
 
-    override fun informFailedRequest(request: FutureAnswer) {
+    override fun informFailedRequest(request: FutureAnswer, failureReason:Throwable?) {
     }
 
     override suspend fun modifyUpstreamResponse(dnsMessage: DnsMessage): DnsMessage {

app/src/main/java/com/frostnerd/smokescreen/util/proxy/ProxyTlsHandler.kt

@@ -64,7 +64,7 @@ class ProxyTlsHandler(
         } ?: (resolveResult.firstOrNull() ?: throw IllegalStateException("The given UpstreamAddress doesn't have an address for the requested IP version (IPv4: $ipv4Enabled, IPv6: $ipv6Enabled)"))
     }
 
-    override fun informFailedRequest(request: FutureAnswer) {
+    override fun informFailedRequest(request: FutureAnswer, failureReason:Throwable?) {
     }
 
     override suspend fun modifyUpstreamResponse(dnsMessage: DnsMessage): DnsMessage {