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//
// ConnectionConfigurationBuilder.swift
// PacketTunnelCore
//
// Created by Mojgan on 2024-09-16.
// Copyright © 2025 Mullvad VPN AB. All rights reserved.
//
import Foundation
import MullvadTypes
import Network
import WireGuardKitTypes
protocol Configuration {
var name: String { get }
func make() throws -> ConnectionConfiguration
}
struct ConnectionConfiguration {
let entryConfiguration: TunnelAdapterConfiguration?
let exitConfiguration: TunnelAdapterConfiguration
}
struct ConnectionConfigurationBuilder {
enum ConnectionType {
case normal
case ephemeral(EphemeralPeerNegotiationState)
}
let type: ConnectionType
let settings: Settings
let connectionData: State.ConnectionData
func make() throws -> ConnectionConfiguration {
switch type {
case .normal:
try NormalConnectionConfiguration(settings: settings, connectionData: connectionData).make()
case let .ephemeral(ephemeralPeerNegotiationState):
try EphemeralConnectionConfiguration(
settings: settings,
connectionData: connectionData,
ephemeralPeerNegotiationState: ephemeralPeerNegotiationState
).make()
}
}
}
private struct NormalConnectionConfiguration: Configuration {
let settings: Settings
let connectionData: State.ConnectionData
var name: String {
"Normal connection configuration"
}
private var activeKey: PrivateKey {
switch connectionData.keyPolicy {
case .useCurrent:
settings.privateKey
case let .usePrior(priorKey, _):
priorKey
}
}
func make() throws -> ConnectionConfiguration {
let entryConfiguration: TunnelAdapterConfiguration? =
if connectionData.selectedRelays.entry != nil {
try ConfigurationBuilder(
privateKey: activeKey,
interfaceAddresses: settings.interfaceAddresses,
dns: settings.dnsServers,
endpoint: connectionData.connectedEndpoint,
allowedIPs: [
IPAddressRange(from: "\(connectionData.selectedRelays.exit.endpoint.socketAddress.ip)/32")!
],
pingableGateway: IPv4Address(LocalNetworkIPs.gatewayAddressIpV4.rawValue)!
).makeConfiguration()
} else {
nil
}
let exitConfiguration = try ConfigurationBuilder(
privateKey: activeKey,
interfaceAddresses: settings.interfaceAddresses,
dns: settings.dnsServers,
endpoint: (entryConfiguration != nil)
? connectionData.selectedRelays.exit.endpoint
: connectionData.connectedEndpoint,
allowedIPs: [
IPAddressRange(from: "0.0.0.0/0")!,
IPAddressRange(from: "::/0")!,
],
pingableGateway: IPv4Address(LocalNetworkIPs.gatewayAddressIpV4.rawValue)!
).makeConfiguration()
return ConnectionConfiguration(
entryConfiguration: entryConfiguration,
exitConfiguration: exitConfiguration
)
}
}
private struct EphemeralConnectionConfiguration: Configuration {
let settings: Settings
let connectionData: State.ConnectionData
let ephemeralPeerNegotiationState: EphemeralPeerNegotiationState
var name: String {
"Ephemeral connection configuration"
}
func make() throws -> ConnectionConfiguration {
switch ephemeralPeerNegotiationState {
case let .single(hop):
let exitConfiguration = try ConfigurationBuilder(
privateKey: hop.configuration.privateKey,
interfaceAddresses: settings.interfaceAddresses,
dns: settings.dnsServers,
endpoint: connectionData.connectedEndpoint,
allowedIPs: hop.configuration.allowedIPs,
preSharedKey: hop.configuration.preSharedKey,
pingableGateway: IPv4Address(LocalNetworkIPs.gatewayAddressIpV4.rawValue)!
).makeConfiguration()
return ConnectionConfiguration(entryConfiguration: nil, exitConfiguration: exitConfiguration)
case let .multi(firstHop, secondHop):
let entryConfiguration = try ConfigurationBuilder(
privateKey: firstHop.configuration.privateKey,
interfaceAddresses: settings.interfaceAddresses,
dns: settings.dnsServers,
endpoint: connectionData.connectedEndpoint,
allowedIPs: firstHop.configuration.allowedIPs,
preSharedKey: firstHop.configuration.preSharedKey,
pingableGateway: IPv4Address(LocalNetworkIPs.gatewayAddressIpV4.rawValue)!
).makeConfiguration()
let exitConfiguration = try ConfigurationBuilder(
privateKey: secondHop.configuration.privateKey,
interfaceAddresses: settings.interfaceAddresses,
dns: settings.dnsServers,
endpoint: secondHop.relay.endpoint,
allowedIPs: secondHop.configuration.allowedIPs,
preSharedKey: secondHop.configuration.preSharedKey,
pingableGateway: IPv4Address(LocalNetworkIPs.gatewayAddressIpV4.rawValue)!
).makeConfiguration()
return ConnectionConfiguration(entryConfiguration: entryConfiguration, exitConfiguration: exitConfiguration)
}
}
}
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