Objective-C wrapper around WireguardGo.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

WireGuardNetworkExtension/Info.plist

@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleDisplayName</key>
+	<string>WireGuardNetworkExtension</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>XPC!</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>NSExtension</key>
+	<dict>
+		<key>NSExtensionPointIdentifier</key>
+		<string>com.apple.networkextension.packet-tunnel</string>
+		<key>NSExtensionPrincipalClass</key>
+		<string>$(PRODUCT_MODULE_NAME).PacketTunnelProvider</string>
+	</dict>
+</dict>
+</plist>

WireGuardNetworkExtension/PacketTunnelProvider.swift

@@ -0,0 +1,38 @@
+//
+//  PacketTunnelProvider.swift
+//  WireGuardNetworkExtension
+//
+//  Created by Jeroen Leenarts on 19-06-18.
+//  Copyright © 2018 Wireguard. All rights reserved.
+//
+
+import NetworkExtension
+
+class PacketTunnelProvider: NEPacketTunnelProvider {
+
+    override func startTunnel(options: [String: NSObject]?, completionHandler: @escaping (Error?) -> Void) {
+        // Add code here to start the process of connecting the tunnel.
+
+    }
+
+    override func stopTunnel(with reason: NEProviderStopReason, completionHandler: @escaping () -> Void) {
+        // Add code here to start the process of stopping the tunnel.
+        completionHandler()
+    }
+
+    override func handleAppMessage(_ messageData: Data, completionHandler: ((Data?) -> Void)?) {
+        // Add code here to handle the message.
+        if let handler = completionHandler {
+            handler(messageData)
+        }
+    }
+
+    override func sleep(completionHandler: @escaping () -> Void) {
+        // Add code here to get ready to sleep.
+        completionHandler()
+    }
+
+    override func wake() {
+        // Add code here to wake up.
+    }
+}

WireGuardNetworkExtension/WireGuardGoWrapper.h

@@ -0,0 +1,16 @@
+//
+//  WireGuardGoWrapper.h
+//  WireGuardNetworkExtension
+//
+//  Created by Jeroen Leenarts on 21-06-18.
+//  Copyright © 2018 Wireguard. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+@interface WireGuardGoWrapper : NSObject
+
+- (void) turnOnWithInterfaceName: (NSString *)interfaceName settingsString: (NSString *)settingsString;
+- (void) turnOff;
+
+@end

WireGuardNetworkExtension/WireGuardGoWrapper.m

@@ -0,0 +1,56 @@
+//
+//  WireGuardGoWrapper.m
+//  WireGuardNetworkExtension
+//
+//  Created by Jeroen Leenarts on 21-06-18.
+//  Copyright © 2018 Wireguard. All rights reserved.
+//
+
+#import "WireGuardGoWrapper.h"
+
+#include "wireguard.h"
+
+/// Trampoline function
+static ssize_t do_read(const void *ctx, const unsigned char *buf, size_t len);
+/// Trampoline function
+static ssize_t do_write(const void *ctx, const unsigned char *buf, size_t len);
+
+@interface WireGuardGoWrapper ()
+
+@property (nonatomic, assign) int handle;
+@property (nonatomic, assign) BOOL isClosed;
+
+@end
+
+@implementation WireGuardGoWrapper
+
+- (void) turnOnWithInterfaceName: (NSString *)interfaceName settingsString: (NSString *)settingsString
+{
+    const char * ifName = [interfaceName UTF8String];
+    const char * settings = [settingsString UTF8String];
+
+    self.handle = wgTurnOn((gostring_t){ .p = ifName, .n = interfaceName.length }, (gostring_t){ .p = settings, .n = settingsString.length }, do_read, do_write, (__bridge void *)(self));
+}
+
+- (void) turnOff
+{
+    self.isClosed = YES;
+    wgTurnOff(self.handle);
+}
+
+@end
+
+static ssize_t do_read(const void *ctx, const unsigned char *buf, size_t len)
+{
+    WireGuardGoWrapper *wrapper = (__bridge WireGuardGoWrapper *)ctx;
+    printf("Reading from instance with ctx %p into buffer %p of length %zu\n", ctx, buf, len);
+    sleep(1);
+    return wrapper.isClosed ? -1 : 0;
+}
+
+static ssize_t do_write(const void *ctx, const unsigned char *buf, size_t len)
+{
+    WireGuardGoWrapper *wrapper = (__bridge WireGuardGoWrapper *)ctx;
+    printf("Writing from instance with ctx %p into buffer %p of length %zu\n", ctx, buf, len);
+    return len;
+}

WireGuardNetworkExtension/WireGuardNetworkExtension-Bridging-Header.h

@@ -0,0 +1,5 @@
+//
+//  Use this file to import your target's public headers that you would like to expose to Swift.
+//
+
+#import "WireGuardGoWrapper.h"

WireGuardNetworkExtension/WireGuardNetworkExtension.entitlements

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>com.apple.security.application-groups</key>
+	<array>
+		<string>group.appforce1.com.wireguard.ios.WireGuard</string>
+	</array>
+	<key>keychain-access-groups</key>
+	<array>
+		<string>$(AppIdentifierPrefix)appforce1.com.wireguard.ios.WireGuard</string>
+	</array>
+</dict>
+</plist>