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| 1 | +import XCTest |
| 2 | +@testable import Kronos |
| 3 | + |
| 4 | +/// Extension used to generate random UInt8 values within the given bounds and excluding the given value set. |
| 5 | +extension UInt8 { |
| 6 | + static func mockRandom(min: Self = .min, max: Self = .max, otherThan values: Set<Self> = []) -> Self { |
| 7 | + var random: Self = .random(in: min...max) |
| 8 | + while values.contains(random) { random = .random(in: min...max) } |
| 9 | + return random |
| 10 | + } |
| 11 | +} |
| 12 | + |
| 13 | +class InternetAddressTests: XCTestCase { |
| 14 | + func testIfIPv4AddressIsPrivate() throws { |
| 15 | + let privateIPs: [InternetAddress] = try (0..<50).flatMap { _ in |
| 16 | + return [ |
| 17 | + // random private IPs of class A: 10.0.0.0 — 10.255.255.255 |
| 18 | + try .mockIPv4([10, .mockRandom(), .mockRandom(), .mockRandom()]), |
| 19 | + // random private IPs of class B: 172.16.0.0 — 172.31.255.255 |
| 20 | + try .mockIPv4([172, .mockRandom(min: 16, max: 31), .mockRandom(), .mockRandom()]), |
| 21 | + // random private IPs of class C: 192.168.0.0 — 192.168.255.255 |
| 22 | + try .mockIPv4([192, 168, .mockRandom(), .mockRandom()]), |
| 23 | + // multicast IPs 224.0.0.0 - 239.255.255.255 |
| 24 | + try .mockIPv4([.mockRandom(min: 224, max: 239), .mockRandom(), .mockRandom(), .mockRandom()]), |
| 25 | + // broadcast IP 255.255.255.255 |
| 26 | + try .mockIPv4([255, 255, 255, 255]), |
| 27 | + ] |
| 28 | + } |
| 29 | + let publicIPs: [InternetAddress] = try (0..<50).flatMap { _ in |
| 30 | + return [ |
| 31 | + try .mockIPv4([.mockRandom(otherThan: Set<UInt8>([10, 172, 192, 255] + (224...239))), .mockRandom(), .mockRandom(), .mockRandom()]), |
| 32 | + try .mockIPv4([172, .mockRandom(min: 0, max: 15), .mockRandom(), .mockRandom()]), |
| 33 | + try .mockIPv4([172, .mockRandom(min: 32, max: 255), .mockRandom(), .mockRandom()]), |
| 34 | + try .mockIPv4([192, .mockRandom(otherThan: [168]), .mockRandom(), .mockRandom()]), |
| 35 | + try .mockIPv4([255, .mockRandom(max: 254), .mockRandom(), .mockRandom()]), |
| 36 | + try .mockIPv4([255, .mockRandom(), .mockRandom(max: 254), .mockRandom()]), |
| 37 | + try .mockIPv4([255, .mockRandom(), .mockRandom(), .mockRandom(max: 254)]), |
| 38 | + ] |
| 39 | + } |
| 40 | + |
| 41 | + privateIPs.forEach { ip in |
| 42 | + XCTAssertTrue(ip.isPrivate, "\(ip.host ?? "nil") should be private IP") |
| 43 | + } |
| 44 | + publicIPs.forEach { ip in |
| 45 | + XCTAssertFalse(ip.isPrivate, "\(ip.host ?? "nil") should not be private IP") |
| 46 | + } |
| 47 | + } |
| 48 | + |
| 49 | + func testIfIPv6AddressIsPrivate() throws { |
| 50 | + let privateIPs: [InternetAddress] = try (0..<50).flatMap { _ in |
| 51 | + return [ |
| 52 | + // random private IP starting with `fd` prefix |
| 53 | + try .mockIPv6([0xfd] + (0..<15).map({ _ in .mockRandom() })), |
| 54 | + // random multicast IP starting with `ff` prefix |
| 55 | + try .mockIPv6([0xff] + (0..<15).map({ _ in .mockRandom() })), |
| 56 | + ] |
| 57 | + } |
| 58 | + let publicIPs: [InternetAddress] = try (0..<50).flatMap { _ in |
| 59 | + return [ |
| 60 | + // first byte is mocked to avoid having `fd` or `ff` prefix |
| 61 | + try .mockIPv6([.mockRandom(min: 0xf0, otherThan: [0xfd, 0xff])] + (0..<15).map({ _ in .mockRandom() })), |
| 62 | + try .mockIPv6([.mockRandom(max: 0xfc, otherThan: [0xf])] + (0..<15).map({ _ in .mockRandom() })), |
| 63 | + ] |
| 64 | + } |
| 65 | + |
| 66 | + privateIPs.forEach { ip in |
| 67 | + XCTAssertTrue(ip.isPrivate, "\(ip.host ?? "nil") should be private IP") |
| 68 | + } |
| 69 | + publicIPs.forEach { ip in |
| 70 | + XCTAssertFalse(ip.isPrivate, "\(ip.host ?? "nil") should not be private IP") |
| 71 | + } |
| 72 | + } |
| 73 | +} |
| 74 | + |
| 75 | +// MARK: - Mocks |
| 76 | + |
| 77 | +private extension InternetAddress { |
| 78 | + static func mockIPv4(_ bytes: [UInt8]) throws -> InternetAddress { |
| 79 | + precondition(bytes.count == 4, "Expected 4 bytes") |
| 80 | + let numbers = bytes.map { String($0) } |
| 81 | + let ipv4String = numbers.joined(separator: ".") // e.g. '192.168.1.1' |
| 82 | + let address: InternetAddress? = .mockWith(ipv4String: ipv4String) |
| 83 | + return try XCTUnwrap(address, "\(ipv4String) is not a valid IPv4 string") |
| 84 | + } |
| 85 | + |
| 86 | + static func mockIPv6(_ bytes: [UInt8]) throws -> InternetAddress { |
| 87 | + precondition(bytes.count == 16, "Expected 16 bytes") |
| 88 | + let groups: [String] = (0..<8).map { idx in |
| 89 | + let hexA = String(bytes[idx * 2], radix: 16) |
| 90 | + let hexB = String(bytes[idx * 2 + 1], radix: 16) |
| 91 | + return hexA + hexB |
| 92 | + } |
| 93 | + let ipv6String = groups.joined(separator: ":") // e.g. 'ab:ab:ab:ab:ab:ab:ab:ab' |
| 94 | + let randomcasedIpv6String = Bool.random() ? ipv6String.lowercased() : ipv6String.uppercased() |
| 95 | + let address: InternetAddress? = .mockWith(ipv6String: randomcasedIpv6String) |
| 96 | + return try XCTUnwrap(address, "\(ipv6String) is not a valid IPv6 string") |
| 97 | + } |
| 98 | + |
| 99 | + static func mockWith(ipv4String: String) -> InternetAddress? { |
| 100 | + var inaddr = in_addr() |
| 101 | + guard ipv4String.withCString({ inet_pton(AF_INET, $0, &inaddr) }) == 1 else { |
| 102 | + return nil // likely, not an IPv4 string |
| 103 | + } |
| 104 | + |
| 105 | + var addr = sockaddr_in() |
| 106 | + addr.sin_len = UInt8(MemoryLayout.size(ofValue: addr)) |
| 107 | + addr.sin_family = sa_family_t(AF_INET) |
| 108 | + addr.sin_addr = inaddr |
| 109 | + return .ipv4(addr) |
| 110 | + } |
| 111 | + |
| 112 | + static func mockWith(ipv6String: String) -> InternetAddress? { |
| 113 | + var inaddr = in6_addr() |
| 114 | + guard ipv6String.withCString({ inet_pton(AF_INET6, $0, &inaddr) }) == 1 else { |
| 115 | + return nil // likely, not an IPv6 string |
| 116 | + } |
| 117 | + |
| 118 | + var addr = sockaddr_in6() |
| 119 | + addr.sin6_len = UInt8(MemoryLayout.size(ofValue: addr)) |
| 120 | + addr.sin6_family = sa_family_t(AF_INET6) |
| 121 | + addr.sin6_addr = inaddr |
| 122 | + return .ipv6(addr) |
| 123 | + } |
| 124 | +} |
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