blob: ecb888eab1f4f73c8b140d8d289131f7aa58a118 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
|
// SPDX-License-Identifier: MIT
// Copyright © 2018-2020 WireGuard LLC. All Rights Reserved.
import Foundation
import Network
public struct IPAddressRange {
public let address: IPAddress
public let networkPrefixLength: UInt8
init(address: IPAddress, networkPrefixLength: UInt8) {
self.address = address
self.networkPrefixLength = networkPrefixLength
}
}
extension IPAddressRange: Equatable {
public static func == (lhs: IPAddressRange, rhs: IPAddressRange) -> Bool {
return lhs.address.rawValue == rhs.address.rawValue && lhs.networkPrefixLength == rhs.networkPrefixLength
}
}
extension IPAddressRange: Hashable {
public func hash(into hasher: inout Hasher) {
hasher.combine(address.rawValue)
hasher.combine(networkPrefixLength)
}
}
extension IPAddressRange {
public var stringRepresentation: String {
return "\(address)/\(networkPrefixLength)"
}
public init?(from string: String) {
guard let parsed = IPAddressRange.parseAddressString(string) else { return nil }
address = parsed.0
networkPrefixLength = parsed.1
}
private static func parseAddressString(_ string: String) -> (IPAddress, UInt8)? {
let endOfIPAddress = string.lastIndex(of: "/") ?? string.endIndex
let addressString = String(string[string.startIndex ..< endOfIPAddress])
let address: IPAddress
if let addr = IPv4Address(addressString) {
address = addr
} else if let addr = IPv6Address(addressString) {
address = addr
} else {
return nil
}
let maxNetworkPrefixLength: UInt8 = address is IPv4Address ? 32 : 128
var networkPrefixLength: UInt8
if endOfIPAddress < string.endIndex { // "/" was located
let indexOfNetworkPrefixLength = string.index(after: endOfIPAddress)
guard indexOfNetworkPrefixLength < string.endIndex else { return nil }
let networkPrefixLengthSubstring = string[indexOfNetworkPrefixLength ..< string.endIndex]
guard let npl = UInt8(networkPrefixLengthSubstring) else { return nil }
networkPrefixLength = min(npl, maxNetworkPrefixLength)
} else {
networkPrefixLength = maxNetworkPrefixLength
}
return (address, networkPrefixLength)
}
public func subnetMask() -> IPAddress {
if address is IPv4Address {
let mask = networkPrefixLength > 0 ? ~UInt32(0) << (32 - networkPrefixLength) : UInt32(0)
let bytes = Data([
UInt8(truncatingIfNeeded: mask >> 24),
UInt8(truncatingIfNeeded: mask >> 16),
UInt8(truncatingIfNeeded: mask >> 8),
UInt8(truncatingIfNeeded: mask >> 0)
])
return IPv4Address(bytes)!
}
if address is IPv6Address {
var bytes = Data(repeating: 0, count: 16)
for i in 0..<Int(networkPrefixLength/8) {
bytes[i] = 0xff
}
let nibble = networkPrefixLength % 32
if nibble != 0 {
let mask = ~UInt32(0) << (32 - nibble)
let i = Int(networkPrefixLength / 32 * 4)
bytes[i + 0] = UInt8(truncatingIfNeeded: mask >> 24)
bytes[i + 1] = UInt8(truncatingIfNeeded: mask >> 16)
bytes[i + 2] = UInt8(truncatingIfNeeded: mask >> 8)
bytes[i + 3] = UInt8(truncatingIfNeeded: mask >> 0)
}
return IPv6Address(bytes)!
}
fatalError()
}
public func maskedAddress() -> IPAddress {
let subnet = subnetMask().rawValue
var masked = Data(address.rawValue)
if subnet.count != masked.count {
fatalError()
}
for i in 0..<subnet.count {
masked[i] &= subnet[i]
}
if subnet.count == 4 {
return IPv4Address(masked)!
}
if subnet.count == 16 {
return IPv6Address(masked)!
}
fatalError()
}
}
|
