1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
// SPDX-License-Identifier: MIT
// Copyright © 2018 WireGuard LLC. All Rights Reserved.
import Foundation
import Network
import NetworkExtension
import os.log
enum PacketTunnelProviderError: Error {
case savedProtocolConfigurationIsInvalid
case dnsResolutionFailure(hostnames: [String])
case couldNotStartWireGuard
case coultNotSetNetworkSettings
}
class PacketTunnelProvider: NEPacketTunnelProvider {
private var wgHandle: Int32?
private var networkMonitor: NWPathMonitor?
deinit {
networkMonitor?.cancel()
}
override func startTunnel(options: [String: NSObject]?, completionHandler startTunnelCompletionHandler: @escaping (Error?) -> Void) {
let activationAttemptId = options?["activationAttemptId"] as? String
let errorNotifier = ErrorNotifier(activationAttemptId: activationAttemptId, tunnelProvider: self)
guard let tunnelProviderProtocol = protocolConfiguration as? NETunnelProviderProtocol,
let tunnelConfiguration = tunnelProviderProtocol.tunnelConfiguration() else {
errorNotifier.notify(PacketTunnelProviderError.savedProtocolConfigurationIsInvalid)
startTunnelCompletionHandler(PacketTunnelProviderError.savedProtocolConfigurationIsInvalid)
return
}
startTunnel(with: tunnelConfiguration, errorNotifier: errorNotifier, completionHandler: startTunnelCompletionHandler)
}
//swiftlint:disable:next function_body_length
func startTunnel(with tunnelConfiguration: TunnelConfiguration, errorNotifier: ErrorNotifier, completionHandler startTunnelCompletionHandler: @escaping (Error?) -> Void) {
configureLogger()
wg_log(.info, message: "Starting tunnel '\(tunnelConfiguration.interface.name)'")
let endpoints = tunnelConfiguration.peers.map { $0.endpoint }
var resolvedEndpoints = [Endpoint?]()
do {
resolvedEndpoints = try DNSResolver.resolveSync(endpoints: endpoints)
} catch DNSResolverError.dnsResolutionFailed(let hostnames) {
wg_log(.error, staticMessage: "Starting tunnel failed: DNS resolution failure")
wg_log(.error, message: "Hostnames for which DNS resolution failed: \(hostnames.joined(separator: ", "))")
errorNotifier.notify(PacketTunnelProviderError.dnsResolutionFailure(hostnames: hostnames))
startTunnelCompletionHandler(PacketTunnelProviderError.dnsResolutionFailure(hostnames: hostnames))
return
} catch {
// There can be no other errors from DNSResolver.resolveSync()
fatalError()
}
assert(endpoints.count == resolvedEndpoints.count)
let packetTunnelSettingsGenerator = PacketTunnelSettingsGenerator(tunnelConfiguration: tunnelConfiguration, resolvedEndpoints: resolvedEndpoints)
// Bring up wireguard-go backend
let fileDescriptor = packetFlow.value(forKeyPath: "socket.fileDescriptor") as! Int32 //swiftlint:disable:this force_cast
if fileDescriptor < 0 {
wg_log(.error, staticMessage: "Starting tunnel failed: Could not determine file descriptor")
errorNotifier.notify(PacketTunnelProviderError.couldNotStartWireGuard)
startTunnelCompletionHandler(PacketTunnelProviderError.couldNotStartWireGuard)
return
}
let wireguardSettings = packetTunnelSettingsGenerator.uapiConfiguration()
var handle: Int32 = -1
networkMonitor = NWPathMonitor()
networkMonitor?.pathUpdateHandler = { path in
guard handle >= 0 else { return }
if path.status == .satisfied {
wg_log(.debug, message: "Network change detected, re-establishing sockets and IPs: \(path.availableInterfaces)")
let endpointString = packetTunnelSettingsGenerator.endpointUapiConfiguration(currentListenPort: wgGetListenPort(handle))
let err = withStringsAsGoStrings(endpointString, call: { return wgSetConfig(handle, $0.0) })
if err == -EADDRINUSE {
let endpointString = packetTunnelSettingsGenerator.endpointUapiConfiguration(currentListenPort: 0)
_ = withStringsAsGoStrings(endpointString, call: { return wgSetConfig(handle, $0.0) })
}
}
}
networkMonitor?.start(queue: DispatchQueue(label: "NetworkMonitor"))
handle = connect(interfaceName: tunnelConfiguration.interface.name, settings: wireguardSettings, fileDescriptor: fileDescriptor)
if handle < 0 {
wg_log(.error, staticMessage: "Starting tunnel failed: Could not start WireGuard")
errorNotifier.notify(PacketTunnelProviderError.couldNotStartWireGuard)
startTunnelCompletionHandler(PacketTunnelProviderError.couldNotStartWireGuard)
return
}
wgHandle = handle
let networkSettings: NEPacketTunnelNetworkSettings = packetTunnelSettingsGenerator.generateNetworkSettings()
setTunnelNetworkSettings(networkSettings) { error in
if let error = error {
wg_log(.error, staticMessage: "Starting tunnel failed: Error setting network settings.")
wg_log(.error, message: "Error from setTunnelNetworkSettings: \(error.localizedDescription)")
errorNotifier.notify(PacketTunnelProviderError.coultNotSetNetworkSettings)
startTunnelCompletionHandler(PacketTunnelProviderError.coultNotSetNetworkSettings)
} else {
startTunnelCompletionHandler(nil)
}
}
}
override func stopTunnel(with reason: NEProviderStopReason, completionHandler: @escaping () -> Void) {
networkMonitor?.cancel()
networkMonitor = nil
ErrorNotifier.removeLastErrorFile()
wg_log(.info, staticMessage: "Stopping tunnel")
if let handle = wgHandle {
wgTurnOff(handle)
}
completionHandler()
}
private func configureLogger() {
Logger.configureGlobal(withFilePath: FileManager.networkExtensionLogFileURL?.path)
wgSetLogger { level, msgC in
guard let msgC = msgC else { return }
let logType: OSLogType
switch level {
case 0:
logType = .debug
case 1:
logType = .info
case 2:
logType = .error
default:
logType = .default
}
wg_log(logType, message: String(cString: msgC))
}
}
private func connect(interfaceName: String, settings: String, fileDescriptor: Int32) -> Int32 {
return withStringsAsGoStrings(interfaceName, settings) { return wgTurnOn($0.0, $0.1, fileDescriptor) }
}
}
// swiftlint:disable:next large_tuple identifier_name
func withStringsAsGoStrings<R>(_ s1: String, _ s2: String? = nil, _ s3: String? = nil, _ s4: String? = nil, call: ((gostring_t, gostring_t, gostring_t, gostring_t)) -> R) -> R {
// swiftlint:disable:next large_tuple identifier_name
func helper(_ p1: UnsafePointer<Int8>?, _ p2: UnsafePointer<Int8>?, _ p3: UnsafePointer<Int8>?, _ p4: UnsafePointer<Int8>?, _ call: ((gostring_t, gostring_t, gostring_t, gostring_t)) -> R) -> R {
return call((gostring_t(p: p1, n: s1.utf8.count), gostring_t(p: p2, n: s2?.utf8.count ?? 0), gostring_t(p: p3, n: s3?.utf8.count ?? 0), gostring_t(p: p4, n: s4?.utf8.count ?? 0)))
}
return helper(s1, s2, s3, s4, call)
}
|
