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//
// SimulatorTunnelProviderHost.swift
// MullvadVPN
//
// Created by pronebird on 10/02/2020.
// Copyright © 2025 Mullvad VPN AB. All rights reserved.
//
#if targetEnvironment(simulator)
@preconcurrency import Foundation
import MullvadLogging
import MullvadREST
import MullvadSettings
import MullvadTypes
import NetworkExtension
import PacketTunnelCore
final class SimulatorTunnelProviderHost: SimulatorTunnelProviderDelegate, @unchecked Sendable {
private var observedState: ObservedState = .disconnected
private var selectedRelays: SelectedRelays?
private let urlRequestProxy: URLRequestProxy
private let apiRequestProxy: APIRequestProxy
private let relaySelector: RelaySelectorProtocol
private let providerLogger = Logger(label: "SimulatorTunnelProviderHost")
private let dispatchQueue = DispatchQueue(label: "SimulatorTunnelProviderHostQueue")
public var onHandleProviderMessage: ((TunnelProviderMessage) -> Void)?
init(
relaySelector: RelaySelectorProtocol,
transportProvider: TransportProvider,
apiTransportProvider: APITransportProvider
) {
self.relaySelector = relaySelector
self.urlRequestProxy = URLRequestProxy(
dispatchQueue: dispatchQueue,
transportProvider: transportProvider
)
self.apiRequestProxy = APIRequestProxy(
dispatchQueue: dispatchQueue,
transportProvider: apiTransportProvider
)
}
override func startTunnel(
options: [String: NSObject]?,
completionHandler: @escaping @Sendable (Error?) -> Void
) {
dispatchQueue.async { [weak self] in
guard let self else {
completionHandler(nil)
return
}
var selectedRelays: SelectedRelays?
do {
let tunnelOptions = PacketTunnelOptions(rawOptions: options ?? [:])
selectedRelays = try tunnelOptions.getSelectedRelays()
} catch {
providerLogger.error(
error: error,
message: """
Failed to decode selected relay passed from the app. \
Will continue by picking new relay.
"""
)
}
do {
setInternalStateConnected(with: try selectedRelays ?? pickRelays())
completionHandler(nil)
} catch let error where error is NoRelaysSatisfyingConstraintsError {
observedState = .error(ObservedBlockedState(reason: .noRelaysSatisfyingConstraints))
completionHandler(error)
} catch {
providerLogger.error(
error: error,
message: "Failed to pick relay."
)
completionHandler(error)
}
}
}
override func stopTunnel(with reason: NEProviderStopReason, completionHandler: @escaping @Sendable () -> Void) {
dispatchQueue.async { [weak self] in
self?.selectedRelays = nil
self?.observedState = .disconnected
completionHandler()
}
}
override func handleAppMessage(_ messageData: Data, completionHandler: ((Data?) -> Void)?) {
dispatchQueue.sync {
do {
let message = try TunnelProviderMessage(messageData: messageData)
self.handleProviderMessage(message, completionHandler: completionHandler)
} catch {
self.providerLogger.error(
error: error,
message: "Failed to decode app message."
)
completionHandler?(nil)
}
}
}
private func handleProviderMessage(
_ message: TunnelProviderMessage,
completionHandler: ((Data?) -> Void)?
) {
nonisolated(unsafe) let handler = completionHandler
switch message {
case .getTunnelStatus:
var reply: Data?
do {
reply = try TunnelProviderReply(observedState).encode()
} catch {
self.providerLogger.error(
error: error,
message: "Failed to encode tunnel status."
)
}
handler?(reply)
case let .reconnectTunnel(nextRelay):
reasserting = true
switch nextRelay {
case let .preSelected(selectedRelays):
self.selectedRelays = selectedRelays
case .random:
if let nextRelays = try? pickRelays() {
self.selectedRelays = nextRelays
}
case .current:
break
}
setInternalStateReconnecting(with: selectedRelays)
reasserting = false
completionHandler?(nil)
// The PacketTunnel does not run on the simulator.
// Fake a reconnecting state that becomes connected after long enough for the UI to change appropriately.
dispatchQueue.asyncAfter(deadline: .now() + .milliseconds(600)) { [weak self] in
self?.setInternalStateConnected(with: self?.selectedRelays)
}
case let .sendURLRequest(proxyRequest):
urlRequestProxy.sendRequest(proxyRequest) { response in
var reply: Data?
do {
reply = try TunnelProviderReply(response).encode()
} catch {
self.providerLogger.error(
error: error,
message: "Failed to encode ProxyURLResponse."
)
}
handler?(reply)
}
case let .sendAPIRequest(proxyRequest):
apiRequestProxy.sendRequest(proxyRequest) { response in
var reply: Data?
do {
reply = try TunnelProviderReply(response).encode()
} catch {
self.providerLogger.error(
error: error,
message: "Failed to encode ProxyURLResponse."
)
}
handler?(reply)
}
case let .cancelURLRequest(listId):
urlRequestProxy.cancelRequest(identifier: listId)
completionHandler?(nil)
case let .cancelAPIRequest(listId):
apiRequestProxy.cancelRequest(identifier: listId)
completionHandler?(nil)
case .privateKeyRotation:
completionHandler?(nil)
}
onHandleProviderMessage?(message)
}
private func pickRelays() throws -> SelectedRelays {
let settings = try SettingsManager.readSettings()
return try relaySelector.selectRelays(
tunnelSettings: settings,
connectionAttemptCount: 0
)
}
private func setInternalStateReconnecting(with selectedRelays: SelectedRelays?) {
guard let selectedRelays = selectedRelays else { return }
do {
let settings = try SettingsManager.readSettings()
observedState = .reconnecting(
ObservedConnectionState(
selectedRelays: selectedRelays,
relayConstraints: settings.relayConstraints,
networkReachability: .reachable,
connectionAttemptCount: 0,
transportLayer: .udp,
remotePort: selectedRelays.entry?.endpoint.ipv4Relay.port
?? selectedRelays.exit.endpoint.ipv4Relay
.port,
isPostQuantum: settings.tunnelQuantumResistance.isEnabled,
isDaitaEnabled: settings.daita.daitaState.isEnabled
)
)
} catch {
providerLogger.error(error: error, message: "Failed to read device settings")
}
}
private func setInternalStateConnected(with selectedRelays: SelectedRelays?) {
guard let selectedRelays = selectedRelays else { return }
self.selectedRelays = selectedRelays
do {
let settings = try SettingsManager.readSettings()
observedState = .connected(
ObservedConnectionState(
selectedRelays: selectedRelays,
relayConstraints: settings.relayConstraints,
networkReachability: .reachable,
connectionAttemptCount: 0,
transportLayer: .udp,
remotePort: selectedRelays.entry?.endpoint.ipv4Relay.port
?? selectedRelays.exit.endpoint.ipv4Relay
.port,
isPostQuantum: settings.tunnelQuantumResistance.isEnabled,
isDaitaEnabled: settings.daita.daitaState.isEnabled
)
)
} catch {
providerLogger.error(
error: error,
message: "Failed to read device settings."
)
}
}
}
#endif
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