diff options
Diffstat (limited to 'WireGuardNetworkExtension/PacketTunnelProvider.swift')
-rw-r--r-- | WireGuardNetworkExtension/PacketTunnelProvider.swift | 200 |
1 files changed, 160 insertions, 40 deletions
diff --git a/WireGuardNetworkExtension/PacketTunnelProvider.swift b/WireGuardNetworkExtension/PacketTunnelProvider.swift index d402aa1..f7563be 100644 --- a/WireGuardNetworkExtension/PacketTunnelProvider.swift +++ b/WireGuardNetworkExtension/PacketTunnelProvider.swift @@ -18,13 +18,13 @@ class PacketTunnelProvider: NEPacketTunnelProvider { // MARK: Properties - /// A reference to the WireGuard wrapper object. - let wireGuardWrapper = WireGuardGoWrapper() + var wgHandle: Int32? + var wgContext: WireGuardContext? // MARK: NEPacketTunnelProvider /// Begin the process of establishing the tunnel. - override func startTunnel(options: [String: NSObject]?, completionHandler: @escaping (Error?) -> Void) { + override func startTunnel(options: [String: NSObject]?, completionHandler startTunnelCompletionHandler: @escaping (Error?) -> Void) { os_log("Starting tunnel", log: Log.general, type: .info) let config = self.protocolConfiguration as! NETunnelProviderProtocol // swiftlint:disable:this force_cast @@ -37,57 +37,120 @@ class PacketTunnelProvider: NEPacketTunnelProvider { let validatedEndpoints = endpoints.commaSeparatedToArray().compactMap { try? Endpoint(endpointString: String($0)) }.compactMap {$0} let validatedAddresses = addresses.compactMap { try? CIDRAddress(stringRepresentation: String($0)) }.compactMap { $0 } - if let firstEndpoint = validatedEndpoints.first, wireGuardWrapper.turnOn(withInterfaceName: interfaceName, settingsString: settings) { - // We use the first endpoint for the ipAddress - let newSettings = NEPacketTunnelNetworkSettings(tunnelRemoteAddress: firstEndpoint.ipAddress) - newSettings.tunnelOverheadBytes = 80 + guard let firstEndpoint = validatedEndpoints.first else { + startTunnelCompletionHandler(PacketTunnelProviderError.tunnelSetupFailed) + return + + } - // IPv4 settings - let validatedIPv4Addresses = validatedAddresses.filter { $0.addressType == .IPv4} - if validatedIPv4Addresses.count > 0 { - let ipv4Settings = NEIPv4Settings(addresses: validatedIPv4Addresses.map { $0.ipAddress }, subnetMasks: validatedIPv4Addresses.map { $0.subnetString }) - ipv4Settings.includedRoutes = [NEIPv4Route.default()] - ipv4Settings.excludedRoutes = validatedEndpoints.filter { $0.addressType == .IPv4}.map { - NEIPv4Route(destinationAddress: $0.ipAddress, subnetMask: "255.255.255.255")} + wgSetLogger { (level, tagCStr, msgCStr) in + let tag = (tagCStr != nil) ? String(cString: tagCStr!) : "" + let msg = (msgCStr != nil) ? String(cString: msgCStr!) : "" + NSLog("wg log: \(level): \(tag): \(msg)") + } - newSettings.ipv4Settings = ipv4Settings + wgContext = WireGuardContext(packetFlow: self.packetFlow) + + let handle = withStringsAsGoStrings(interfaceName, settings) { (nameGoStr, settingsGoStr) -> Int32 in + return withUnsafeMutablePointer(to: &wgContext) { (wgCtxPtr) -> Int32 in + return wgTurnOn(nameGoStr, settingsGoStr, + // read_fn: Read from the TUN interface and pass it on to WireGuard + { (wgCtxPtr, buf, len) -> Int in + guard let wgCtxPtr = wgCtxPtr else { return 0 } + guard let buf = buf else { return 0 } + let wgContext = wgCtxPtr.bindMemory(to: WireGuardContext.self, capacity: 1).pointee + var isTunnelClosed = false + guard let packet = wgContext.readPacket(isTunnelClosed: &isTunnelClosed) else { return 0 } + if isTunnelClosed { return -1 } + let packetData = packet.data + if packetData.count <= len { + packetData.copyBytes(to: buf, count: packetData.count) + return packetData.count + } + return 0 + }, + // write_fn: Receive packets from WireGuard and write to the TUN interface + { (wgCtxPtr, buf, len) -> Int in + guard let wgCtxPtr = wgCtxPtr else { return 0 } + guard let buf = buf else { return 0 } + guard len > 0 else { return 0 } + let wgContext = wgCtxPtr.bindMemory(to: WireGuardContext.self, capacity: 1).pointee + let ipVersionBits = (buf[0] & 0xf0) >> 4 + let ipVersion: sa_family_t? = { + if ipVersionBits == 4 { return sa_family_t(AF_INET) } // IPv4 + if ipVersionBits == 6 { return sa_family_t(AF_INET6) } // IPv6 + return nil + }() + guard let protocolFamily = ipVersion else { fatalError("Unknown IP version") } + let packet = NEPacket(data: Data(bytes: buf, count: len), protocolFamily: protocolFamily) + var isTunnelClosed = false + let isWritten = wgContext.writePacket(packet: packet, isTunnelClosed: &isTunnelClosed) + if isTunnelClosed { return -1 } + if isWritten { + return len + } + return 0 + }, + wgCtxPtr) } + } - // IPv6 settings - let validatedIPv6Addresses = validatedAddresses.filter { $0.addressType == .IPv6} - if validatedIPv6Addresses.count > 0 { - let ipv6Settings = NEIPv6Settings(addresses: validatedIPv6Addresses.map { $0.ipAddress }, networkPrefixLengths: validatedIPv6Addresses.map { NSNumber(value: $0.subnet) }) - ipv6Settings.includedRoutes = [NEIPv6Route.default()] - ipv6Settings.excludedRoutes = validatedEndpoints.filter { $0.addressType == .IPv6}.map { NEIPv6Route(destinationAddress: $0.ipAddress, networkPrefixLength: 0)} + if handle < 0 { + startTunnelCompletionHandler(PacketTunnelProviderError.tunnelSetupFailed) + return + } - newSettings.ipv6Settings = ipv6Settings - } + wgHandle = handle - if let dns = config.providerConfiguration?[PCKeys.dns.rawValue] as? String { - newSettings.dnsSettings = NEDNSSettings(servers: dns.commaSeparatedToArray()) - } - if let mtu = mtu, mtu.intValue > 0 { - newSettings.mtu = mtu - } + // We use the first endpoint for the ipAddress + let newSettings = NEPacketTunnelNetworkSettings(tunnelRemoteAddress: firstEndpoint.ipAddress) + newSettings.tunnelOverheadBytes = 80 - setTunnelNetworkSettings(newSettings) { [weak self](error) in - self?.wireGuardWrapper.packetFlow = self?.packetFlow - self?.wireGuardWrapper.configured = true - self?.wireGuardWrapper.startReadingPackets() - completionHandler(error) - } + // IPv4 settings + let validatedIPv4Addresses = validatedAddresses.filter { $0.addressType == .IPv4} + if validatedIPv4Addresses.count > 0 { + let ipv4Settings = NEIPv4Settings(addresses: validatedIPv4Addresses.map { $0.ipAddress }, subnetMasks: validatedIPv4Addresses.map { $0.subnetString }) + ipv4Settings.includedRoutes = [NEIPv4Route.default()] + ipv4Settings.excludedRoutes = validatedEndpoints.filter { $0.addressType == .IPv4}.map { + NEIPv4Route(destinationAddress: $0.ipAddress, subnetMask: "255.255.255.255")} - } else { - completionHandler(PacketTunnelProviderError.tunnelSetupFailed) - wireGuardWrapper.configured = false + newSettings.ipv4Settings = ipv4Settings + } + + // IPv6 settings + let validatedIPv6Addresses = validatedAddresses.filter { $0.addressType == .IPv6} + if validatedIPv6Addresses.count > 0 { + let ipv6Settings = NEIPv6Settings(addresses: validatedIPv6Addresses.map { $0.ipAddress }, networkPrefixLengths: validatedIPv6Addresses.map { NSNumber(value: $0.subnet) }) + ipv6Settings.includedRoutes = [NEIPv6Route.default()] + ipv6Settings.excludedRoutes = validatedEndpoints.filter { $0.addressType == .IPv6}.map { NEIPv6Route(destinationAddress: $0.ipAddress, networkPrefixLength: 0)} + + newSettings.ipv6Settings = ipv6Settings + } + + if let dns = config.providerConfiguration?[PCKeys.dns.rawValue] as? String { + newSettings.dnsSettings = NEDNSSettings(servers: dns.commaSeparatedToArray()) + } + if let mtu = mtu, mtu.intValue > 0 { + newSettings.mtu = mtu + } + + setTunnelNetworkSettings(newSettings) { (error) in + if let error = error { + NSLog("Error setting network settings: \(error)") + startTunnelCompletionHandler(PacketTunnelProviderError.tunnelSetupFailed) + } else { + startTunnelCompletionHandler(nil /* No errors */) + } } } /// Begin the process of stopping the tunnel. override func stopTunnel(with reason: NEProviderStopReason, completionHandler: @escaping () -> Void) { os_log("Stopping tunnel", log: Log.general, type: .info) - - wireGuardWrapper.turnOff() + if let handle = wgHandle { + wgTurnOff(handle) + } + wgContext?.closeTunnel() completionHandler() } @@ -104,3 +167,60 @@ class PacketTunnelProvider: NEPacketTunnelProvider { completionHandler?(responseData) } } + +class WireGuardContext { + private var packetFlow: NEPacketTunnelFlow + private var outboundPackets: [NEPacket] = [] + private var isTunnelClosed: Bool = false + private let readPacketCondition = NSCondition() + + init(packetFlow: NEPacketTunnelFlow) { + self.packetFlow = packetFlow + } + + func closeTunnel() { + isTunnelClosed = true + readPacketCondition.signal() + } + + func readPacket(isTunnelClosed: inout Bool) -> NEPacket? { + if outboundPackets.isEmpty { + let readPacketCondition = NSCondition() + readPacketCondition.lock() + var packetsObtained: [NEPacket]? + packetFlow.readPacketObjects { (packets: [NEPacket]) in + packetsObtained = packets + readPacketCondition.signal() + } + // Wait till the completion handler of packetFlow.readPacketObjects() finishes + while packetsObtained == nil && !self.isTunnelClosed { + readPacketCondition.wait() + } + if let packetsObtained = packetsObtained { + outboundPackets = packetsObtained + } + readPacketCondition.unlock() + } + isTunnelClosed = self.isTunnelClosed + if outboundPackets.isEmpty { + return nil + } else { + return outboundPackets.removeFirst() + } + } + + func writePacket(packet: NEPacket, isTunnelClosed: inout Bool) -> Bool { + isTunnelClosed = self.isTunnelClosed + return packetFlow.writePacketObjects([packet]) + } +} + +private func withStringsAsGoStrings<R>(_ str1: String, _ str2: String, closure: (gostring_t, gostring_t) -> R) -> R { + return str1.withCString { (s1cStr) -> R in + let gstr1 = gostring_t(p: s1cStr, n: str1.utf8.count) + return str2.withCString { (s2cStr) -> R in + let gstr2 = gostring_t(p: s2cStr, n: str2.utf8.count) + return closure(gstr1, gstr2) + } + } +} |