Kit: move types from WireGuardKit to WireGuardKitTypes.

This prevents linking against wg-go when 3rd-party application needs to
use the WireGuardKit types from within the main bundle, therefore
prevents wg-go from spinning off Golang threads where not applicable.

Signed-off-by: Andrej Mihajlov <and@mullvad.net>

Sources/WireGuardKitTypes/InterfaceConfiguration.swift

@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: MIT
+// Copyright © 2018-2021 WireGuard LLC. All Rights Reserved.
+
+import Foundation
+import Network
+
+public struct InterfaceConfiguration {
+    public var privateKey: PrivateKey
+    public var addresses = [IPAddressRange]()
+    public var listenPort: UInt16?
+    public var mtu: UInt16?
+    public var dns = [DNSServer]()
+    public var dnsSearch = [String]()
+
+    public init(privateKey: PrivateKey) {
+        self.privateKey = privateKey
+    }
+}
+
+extension InterfaceConfiguration: Equatable {
+    public static func == (lhs: InterfaceConfiguration, rhs: InterfaceConfiguration) -> Bool {
+        let lhsAddresses = lhs.addresses.filter { $0.address is IPv4Address } + lhs.addresses.filter { $0.address is IPv6Address }
+        let rhsAddresses = rhs.addresses.filter { $0.address is IPv4Address } + rhs.addresses.filter { $0.address is IPv6Address }
+
+        return lhs.privateKey == rhs.privateKey &&
+            lhsAddresses == rhsAddresses &&
+            lhs.listenPort == rhs.listenPort &&
+            lhs.mtu == rhs.mtu &&
+            lhs.dns == rhs.dns &&
+            lhs.dnsSearch == rhs.dnsSearch
+    }
+}