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//
// LeakTests.swift
// MullvadVPNUITests
//
// Created by Niklas Berglund on 2024-05-31.
// Copyright © 2025 Mullvad VPN AB. All rights reserved.
//
import XCTest
class LeakTests: LoggedInWithTimeUITestCase {
static let capturedStreamStartTimestamp: Double = 8
static let capturedStreamEndTimestamp: Double = 3
override func tearDown() {
FirewallClient().removeRules()
super.tearDown()
}
/// Send UDP traffic to a host, connect to relay and make sure - while connected to relay -
/// that no leaked traffic went directly to the host
func testConnectionStartedBeforeTunnelShouldNotLeakOutside() throws {
let skipReason = """
Connections started before the packet tunnel will leak as long as
includeAllNetworks is not set to true when starting the tunnel.
"""
try XCTSkipIf(true, skipReason)
let targetIPAddress = Networking.getAlwaysReachableIPAddress()
startPacketCapture()
let trafficGenerator = TrafficGenerator(destinationHost: targetIPAddress, port: 80)
trafficGenerator.startGeneratingUDPTraffic(interval: 1.0)
TunnelControlPage(app)
.tapConnectButton()
allowAddVPNConfigurationsIfAsked()
TunnelControlPage(app)
.waitForConnectedLabel()
// Keep the tunnel connection for a while
RunLoop.current.run(until: .now + 30)
TunnelControlPage(app)
.tapDisconnectButton()
trafficGenerator.stopGeneratingUDPTraffic()
var capturedStreams = stopPacketCapture()
// For now cut the beginning and and end of the stream to trim out the part where the tunnel connection was not up
capturedStreams = PacketCaptureClient.trimPackets(
streams: capturedStreams,
secondsStart: Self.capturedStreamStartTimestamp,
secondsEnd: Self.capturedStreamEndTimestamp
)
LeakCheck.assertNoLeaks(streams: capturedStreams, rules: [NoTrafficToHostLeakRule(host: targetIPAddress)])
}
/// Send UDP traffic to a host, connect to relay and then disconnect to intentionally leak traffic and make sure that the test catches the leak
func testTrafficCapturedOutsideOfTunnelShouldLeak() throws {
let targetIPAddress = Networking.getAlwaysReachableIPAddress()
startPacketCapture()
let trafficGenerator = TrafficGenerator(destinationHost: targetIPAddress, port: 80)
trafficGenerator.startGeneratingUDPTraffic(interval: 1.0)
TunnelControlPage(app)
.tapConnectButton()
allowAddVPNConfigurationsIfAsked()
TunnelControlPage(app)
.waitForConnectedLabel()
RunLoop.current.run(until: .now + 2)
TunnelControlPage(app)
.tapDisconnectButton()
// Give it some time to generate traffic outside of tunnel
RunLoop.current.run(until: .now + 5)
TunnelControlPage(app)
.tapConnectButton()
// Keep the tunnel connection for a while
RunLoop.current.run(until: .now + 5)
TunnelControlPage(app)
.tapDisconnectButton()
// Keep the capture open for a while
RunLoop.current.run(until: .now + 15)
trafficGenerator.stopGeneratingUDPTraffic()
var capturedStreams = stopPacketCapture()
// For now cut the beginning and and end of the stream to trim out the part where the tunnel connection was not up
capturedStreams = PacketCaptureClient.trimPackets(
streams: capturedStreams,
secondsStart: Self.capturedStreamStartTimestamp,
secondsEnd: Self.capturedStreamEndTimestamp
)
LeakCheck.assertLeaks(streams: capturedStreams, rules: [NoTrafficToHostLeakRule(host: targetIPAddress)])
}
}
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