Disable local DNS in proxy mode to prevent Android port 53 permission crash and allow SOCKS5 startup

Author: RamtinAbdi

android/app/src/main/java/com/masterdns/vpn/service/MasterDnsVpnService.kt

@@ -127,7 +127,8 @@ class MasterDnsVpnService : VpnService() {
                         profile = runtimeProfile,
                         listenPort = socksPort,
                         listenIpOverride = listenIpOverride,
-                        protocolOverride = protocolOverride
+                        protocolOverride = protocolOverride,
+                        localDnsEnabledOverride = if (proxyMode) false else null
                     )
                 )
                 if (profile.resolvers.isNotBlank()) {

android/app/src/main/java/com/masterdns/vpn/util/ConfigGenerator.kt

@@ -19,7 +19,10 @@ object ConfigGenerator {
         profile: ProfileEntity,
         listenPort: Int = 18000,
         listenIpOverride: String? = null,
-        protocolOverride: String? = null
+        protocolOverride: String? = null,
+        localDnsEnabledOverride: Boolean? = null,
+        localDnsIpOverride: String? = null,
+        localDnsPortOverride: Int? = null
     ): String {
         val domains = parseDomains(profile.domains)
         val domainsStr = domains.joinToString(", ") { "\"$it\"" }
@@ -30,6 +33,10 @@ object ConfigGenerator {
             return if (value.isNullOrEmpty()) fallback else value
         }
 
+        fun cfgInt(key: String, fallback: String): Int {
+            return cfg(key, fallback).toIntOrNull() ?: fallback.toIntOrNull() ?: 0
+        }
+
         return buildString {
             appendLine("# MasterDnsVPN Client Configuration")
             appendLine("# Auto-generated by MasterDnsVPN Android")
@@ -51,7 +58,11 @@ object ConfigGenerator {
             appendLine()
 
             // Section 3: Local DNS Service
-            appendLine("LOCAL_DNS_ENABLED = ${cfg("LOCAL_DNS_ENABLED", "false")}")
+            appendLine(
+                "LOCAL_DNS_ENABLED = ${localDnsEnabledOverride?.let { it.toString() } ?: cfg("LOCAL_DNS_ENABLED", "false")}"
+            )
+            appendLine("LOCAL_DNS_IP = \"${escapeToml(localDnsIpOverride ?: cfg("LOCAL_DNS_IP", "127.0.0.1"))}\"")
+            appendLine("LOCAL_DNS_PORT = ${localDnsPortOverride ?: cfgInt("LOCAL_DNS_PORT", "53")}")
             appendLine()
 
             // Section 4: Resolver Selection