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// SPDX-License-Identifier: MIT
// Copyright © 2018-2019 WireGuard LLC. All Rights Reserved.
import Foundation
import Network
import NetworkExtension
protocol LegacyModel: Decodable {
associatedtype Model
var migrated: Model { get }
}
struct LegacyDNSServer: LegacyModel {
let address: IPAddress
var migrated: DNSServer {
return DNSServer(address: address)
}
init(from decoder: Decoder) throws {
let container = try decoder.singleValueContainer()
var data = try container.decode(Data.self)
let ipAddressFromData: IPAddress? = {
switch data.count {
case 4: return IPv4Address(data)
case 16: return IPv6Address(data)
default: return nil
}
}()
guard let ipAddress = ipAddressFromData else {
throw DecodingError.invalidData
}
address = ipAddress
}
enum DecodingError: Error {
case invalidData
}
}
extension Array where Element == LegacyDNSServer {
var migrated: [DNSServer] {
return map { $0.migrated }
}
}
struct LegacyEndpoint: LegacyModel {
let host: Network.NWEndpoint.Host
let port: Network.NWEndpoint.Port
var migrated: Endpoint {
return Endpoint(host: host, port: port)
}
public init(from decoder: Decoder) throws {
let container = try decoder.singleValueContainer()
let endpointString = try container.decode(String.self)
guard !endpointString.isEmpty else { throw DecodingError.invalidData }
let startOfPort: String.Index
let hostString: String
if endpointString.first! == "[" {
// Look for IPv6-style endpoint, like [::1]:80
let startOfHost = endpointString.index(after: endpointString.startIndex)
guard let endOfHost = endpointString.dropFirst().firstIndex(of: "]") else { throw DecodingError.invalidData }
let afterEndOfHost = endpointString.index(after: endOfHost)
guard endpointString[afterEndOfHost] == ":" else { throw DecodingError.invalidData }
startOfPort = endpointString.index(after: afterEndOfHost)
hostString = String(endpointString[startOfHost ..< endOfHost])
} else {
// Look for an IPv4-style endpoint, like 127.0.0.1:80
guard let endOfHost = endpointString.firstIndex(of: ":") else { throw DecodingError.invalidData }
startOfPort = endpointString.index(after: endOfHost)
hostString = String(endpointString[endpointString.startIndex ..< endOfHost])
}
guard let endpointPort = NWEndpoint.Port(String(endpointString[startOfPort ..< endpointString.endIndex])) else { throw DecodingError.invalidData }
let invalidCharacterIndex = hostString.unicodeScalars.firstIndex { char in
return !CharacterSet.urlHostAllowed.contains(char)
}
guard invalidCharacterIndex == nil else { throw DecodingError.invalidData }
host = NWEndpoint.Host(hostString)
port = endpointPort
}
enum DecodingError: Error {
case invalidData
}
}
struct LegacyInterfaceConfiguration: LegacyModel {
let name: String
let privateKey: Data
let addresses: [LegacyIPAddressRange]
let listenPort: UInt16?
let mtu: UInt16?
let dns: [LegacyDNSServer]
var migrated: InterfaceConfiguration {
var interface = InterfaceConfiguration(privateKey: privateKey)
interface.addresses = addresses.migrated
interface.listenPort = listenPort
interface.mtu = mtu
interface.dns = dns.migrated
return interface
}
}
struct LegacyIPAddressRange: LegacyModel {
let address: IPAddress
let networkPrefixLength: UInt8
var migrated: IPAddressRange {
return IPAddressRange(address: address, networkPrefixLength: networkPrefixLength)
}
public init(from decoder: Decoder) throws {
let container = try decoder.singleValueContainer()
var data = try container.decode(Data.self)
networkPrefixLength = data.removeLast()
let ipAddressFromData: IPAddress? = {
switch data.count {
case 4: return IPv4Address(data)
case 16: return IPv6Address(data)
default: return nil
}
}()
guard let ipAddress = ipAddressFromData else { throw DecodingError.invalidData }
address = ipAddress
}
enum DecodingError: Error {
case invalidData
}
}
extension Array where Element == LegacyIPAddressRange {
var migrated: [IPAddressRange] {
return map { $0.migrated }
}
}
struct LegacyPeerConfiguration: LegacyModel {
let publicKey: Data
let preSharedKey: Data?
let allowedIPs: [LegacyIPAddressRange]
let endpoint: LegacyEndpoint?
let persistentKeepAlive: UInt16?
var migrated: PeerConfiguration {
var configuration = PeerConfiguration(publicKey: publicKey)
configuration.preSharedKey = preSharedKey
configuration.allowedIPs = allowedIPs.migrated
configuration.endpoint = endpoint?.migrated
configuration.persistentKeepAlive = persistentKeepAlive
return configuration
}
}
extension Array where Element == LegacyPeerConfiguration {
var migrated: [PeerConfiguration] {
return map { $0.migrated }
}
}
final class LegacyTunnelConfiguration: LegacyModel {
let interface: LegacyInterfaceConfiguration
let peers: [LegacyPeerConfiguration]
var migrated: TunnelConfiguration {
return TunnelConfiguration(name: interface.name, interface: interface.migrated, peers: peers.migrated)
}
}
extension NETunnelProviderProtocol {
@discardableResult
func migrateConfigurationIfNeeded() -> Bool {
guard let configurationVersion = providerConfiguration?["tunnelConfigurationVersion"] as? Int else { return false }
if configurationVersion == 1 {
migrateFromConfigurationV1()
} else {
fatalError("No migration from configuration version \(configurationVersion) exists.")
}
return true
}
private func migrateFromConfigurationV1() {
guard let serializedTunnelConfiguration = providerConfiguration?["tunnelConfiguration"] as? Data else { return }
guard let configuration = try? JSONDecoder().decode(LegacyTunnelConfiguration.self, from: serializedTunnelConfiguration) else { return }
providerConfiguration = [Keys.wgQuickConfig.rawValue: configuration.migrated.asWgQuickConfig()]
}
}
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