PacketTunnel: backport same IP logging.

Commit: cfde812

ios/PacketTunnel/PacketTunnelProvider/PacketTunnelProvider.swift

@@ -24,6 +24,7 @@ class PacketTunnelProvider: NEPacketTunnelProvider {
     private var appMessageHandler: AppMessageHandler!
     private var stateObserverTask: AnyTask?
     private var deviceChecker: DeviceChecker!
+    private var isLoggedSameIP = false
 
     override init() {
         Self.configureLogging()
@@ -120,6 +121,36 @@ class PacketTunnelProvider: NEPacketTunnelProvider {
     }
 }
 
+extension PacketTunnelProvider {
+    override func setTunnelNetworkSettings(
+        _ tunnelNetworkSettings: NETunnelNetworkSettings?,
+        completionHandler: ((Error?) -> Void)? = nil
+    ) {
+        if let networkSettings = tunnelNetworkSettings as? NEPacketTunnelNetworkSettings {
+            let ipv4Addresses = networkSettings.ipv4Settings?.addresses.compactMap { IPv4Address($0) } ?? []
+            let ipv6Addresses = networkSettings.ipv6Settings?.addresses.compactMap { IPv6Address($0) } ?? []
+            let allIPAddresses: [IPAddress] = ipv4Addresses + ipv6Addresses
+
+            if !allIPAddresses.isEmpty, !isLoggedSameIP {
+                isLoggedSameIP = true
+                logIfDeviceHasSameIP(than: allIPAddresses)
+            }
+        }
+
+        super.setTunnelNetworkSettings(tunnelNetworkSettings, completionHandler: completionHandler)
+    }
+
+    private func logIfDeviceHasSameIP(than addresses: [IPAddress]) {
+        let hasIPv4SameAddress = addresses.compactMap { $0 as? IPv4Address }
+            .contains { $0 == ApplicationConfiguration.sameIPv4 }
+        let hasIPv6SameAddress = addresses.compactMap { $0 as? IPv6Address }
+            .contains { $0 == ApplicationConfiguration.sameIPv6 }
+
+        let isUsingSameIP = (hasIPv4SameAddress || hasIPv6SameAddress) ? "" : "NOT "
+        providerLogger.debug("Same IP is \(isUsingSameIP)being used")
+    }
+}
+
 extension PacketTunnelProvider {
     private static func configureLogging() {
         var loggerBuilder = LoggerBuilder()