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// SPDX-License-Identifier: MIT
// Copyright © 2018-2019 WireGuard LLC. All Rights Reserved.
import NetworkExtension
struct ActivateOnDemandSetting {
var isActivateOnDemandEnabled: Bool
var activateOnDemandOption: ActivateOnDemandOption
}
enum ActivateOnDemandOption: Equatable {
case none // Valid only when isActivateOnDemandEnabled is false
case wiFiInterfaceOnly(ActivateOnDemandSSIDOption)
case nonWiFiInterfaceOnly
case anyInterface(ActivateOnDemandSSIDOption)
}
#if os(iOS)
private let nonWiFiInterfaceType: NEOnDemandRuleInterfaceType = .cellular
#elseif os(macOS)
private let nonWiFiInterfaceType: NEOnDemandRuleInterfaceType = .ethernet
#else
#error("Unimplemented")
#endif
enum ActivateOnDemandSSIDOption: Equatable {
case anySSID
case onlySpecificSSIDs([String])
case exceptSpecificSSIDs([String])
}
extension ActivateOnDemandSetting {
func apply(on tunnelProviderManager: NETunnelProviderManager) {
tunnelProviderManager.isOnDemandEnabled = isActivateOnDemandEnabled
let rules: [NEOnDemandRule]?
switch activateOnDemandOption {
case .none:
rules = nil
case .wiFiInterfaceOnly(let ssidOption):
rules = ssidOnDemandRules(option: ssidOption) + [NEOnDemandRuleDisconnect(interfaceType: nonWiFiInterfaceType)]
case .nonWiFiInterfaceOnly:
rules = [NEOnDemandRuleConnect(interfaceType: nonWiFiInterfaceType), NEOnDemandRuleDisconnect(interfaceType: .wiFi)]
case .anyInterface(let ssidOption):
if case .anySSID = ssidOption {
rules = [NEOnDemandRuleConnect(interfaceType: .any)]
} else {
rules = ssidOnDemandRules(option: ssidOption) + [NEOnDemandRuleConnect(interfaceType: nonWiFiInterfaceType)]
}
}
tunnelProviderManager.onDemandRules = rules
}
init(from tunnelProviderManager: NETunnelProviderManager) {
let rules = tunnelProviderManager.onDemandRules ?? []
let activateOnDemandOption: ActivateOnDemandOption
switch rules.count {
case 0:
activateOnDemandOption = .none
case 1:
let rule = rules[0]
precondition(rule.action == .connect)
activateOnDemandOption = .anyInterface(.anySSID)
case 2:
let connectRule = rules.first(where: { $0.action == .connect })!
let disconnectRule = rules.first(where: { $0.action == .disconnect })!
if connectRule.interfaceTypeMatch == .wiFi && disconnectRule.interfaceTypeMatch == nonWiFiInterfaceType {
activateOnDemandOption = .wiFiInterfaceOnly(.anySSID)
} else if connectRule.interfaceTypeMatch == nonWiFiInterfaceType && disconnectRule.interfaceTypeMatch == .wiFi {
activateOnDemandOption = .nonWiFiInterfaceOnly
} else {
fatalError("Unexpected onDemandRules set on tunnel provider manager")
}
case 3:
let ssidRule = rules.first(where: { $0.interfaceTypeMatch == .wiFi && $0.ssidMatch != nil })!
let nonWiFiRule = rules.first(where: { $0.interfaceTypeMatch == nonWiFiInterfaceType })!
let ssids = ssidRule.ssidMatch!
switch (ssidRule.action, nonWiFiRule.action) {
case (.connect, .connect):
activateOnDemandOption = .anyInterface(.onlySpecificSSIDs(ssids))
case (.connect, .disconnect):
activateOnDemandOption = .wiFiInterfaceOnly(.onlySpecificSSIDs(ssids))
case (.disconnect, .connect):
activateOnDemandOption = .anyInterface(.exceptSpecificSSIDs(ssids))
case (.disconnect, .disconnect):
activateOnDemandOption = .wiFiInterfaceOnly(.exceptSpecificSSIDs(ssids))
default:
fatalError("Unexpected SSID onDemandRules set on tunnel provider manager")
}
default:
fatalError("Unexpected number of onDemandRules set on tunnel provider manager")
}
self.activateOnDemandOption = activateOnDemandOption
if activateOnDemandOption == .none {
isActivateOnDemandEnabled = false
} else {
isActivateOnDemandEnabled = tunnelProviderManager.isOnDemandEnabled
}
}
}
extension ActivateOnDemandSetting {
static var defaultSetting = ActivateOnDemandSetting(isActivateOnDemandEnabled: false, activateOnDemandOption: .none)
}
private extension NEOnDemandRuleConnect {
convenience init(interfaceType: NEOnDemandRuleInterfaceType, ssids: [String]? = nil) {
self.init()
interfaceTypeMatch = interfaceType
ssidMatch = ssids
}
}
private extension NEOnDemandRuleDisconnect {
convenience init(interfaceType: NEOnDemandRuleInterfaceType, ssids: [String]? = nil) {
self.init()
interfaceTypeMatch = interfaceType
ssidMatch = ssids
}
}
private func ssidOnDemandRules(option: ActivateOnDemandSSIDOption) -> [NEOnDemandRule] {
switch option {
case .anySSID:
return [NEOnDemandRuleConnect(interfaceType: .wiFi)]
case .onlySpecificSSIDs(let ssids):
assert(!ssids.isEmpty)
return [NEOnDemandRuleConnect(interfaceType: .wiFi, ssids: ssids),
NEOnDemandRuleDisconnect(interfaceType: .wiFi)]
case .exceptSpecificSSIDs(let ssids):
return [NEOnDemandRuleDisconnect(interfaceType: .wiFi, ssids: ssids),
NEOnDemandRuleConnect(interfaceType: .wiFi)]
}
}
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