116 lines
4.0 KiB
Swift
116 lines
4.0 KiB
Swift
// SPDX-License-Identifier: MIT
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// Copyright © 2018-2021 WireGuard LLC. All Rights Reserved.
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import Foundation
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import Network
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public struct IPAddressRange {
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public let address: IPAddress
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public let networkPrefixLength: UInt8
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init(address: IPAddress, networkPrefixLength: UInt8) {
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self.address = address
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self.networkPrefixLength = networkPrefixLength
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}
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}
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extension IPAddressRange: Equatable {
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public static func == (lhs: IPAddressRange, rhs: IPAddressRange) -> Bool {
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return lhs.address.rawValue == rhs.address.rawValue && lhs.networkPrefixLength == rhs.networkPrefixLength
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}
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}
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extension IPAddressRange: Hashable {
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public func hash(into hasher: inout Hasher) {
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hasher.combine(address.rawValue)
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hasher.combine(networkPrefixLength)
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}
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}
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extension IPAddressRange {
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public var stringRepresentation: String {
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return "\(address)/\(networkPrefixLength)"
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}
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public init?(from string: String) {
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guard let parsed = IPAddressRange.parseAddressString(string) else { return nil }
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address = parsed.0
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networkPrefixLength = parsed.1
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}
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private static func parseAddressString(_ string: String) -> (IPAddress, UInt8)? {
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let endOfIPAddress = string.lastIndex(of: "/") ?? string.endIndex
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let addressString = String(string[string.startIndex ..< endOfIPAddress])
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let address: IPAddress
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if let addr = IPv4Address(addressString) {
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address = addr
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} else if let addr = IPv6Address(addressString) {
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address = addr
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} else {
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return nil
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}
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let maxNetworkPrefixLength: UInt8 = address is IPv4Address ? 32 : 128
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var networkPrefixLength: UInt8
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if endOfIPAddress < string.endIndex { // "/" was located
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let indexOfNetworkPrefixLength = string.index(after: endOfIPAddress)
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guard indexOfNetworkPrefixLength < string.endIndex else { return nil }
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let networkPrefixLengthSubstring = string[indexOfNetworkPrefixLength ..< string.endIndex]
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guard let npl = UInt8(networkPrefixLengthSubstring) else { return nil }
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networkPrefixLength = min(npl, maxNetworkPrefixLength)
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} else {
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networkPrefixLength = maxNetworkPrefixLength
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}
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return (address, networkPrefixLength)
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}
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public func subnetMask() -> IPAddress {
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if address is IPv4Address {
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let mask = networkPrefixLength > 0 ? ~UInt32(0) << (32 - networkPrefixLength) : UInt32(0)
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let bytes = Data([
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UInt8(truncatingIfNeeded: mask >> 24),
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UInt8(truncatingIfNeeded: mask >> 16),
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UInt8(truncatingIfNeeded: mask >> 8),
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UInt8(truncatingIfNeeded: mask >> 0)
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])
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return IPv4Address(bytes)!
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}
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if address is IPv6Address {
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var bytes = Data(repeating: 0, count: 16)
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for i in 0..<Int(networkPrefixLength/8) {
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bytes[i] = 0xff
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}
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let nibble = networkPrefixLength % 32
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if nibble != 0 {
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let mask = ~UInt32(0) << (32 - nibble)
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let i = Int(networkPrefixLength / 32 * 4)
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bytes[i + 0] = UInt8(truncatingIfNeeded: mask >> 24)
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bytes[i + 1] = UInt8(truncatingIfNeeded: mask >> 16)
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bytes[i + 2] = UInt8(truncatingIfNeeded: mask >> 8)
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bytes[i + 3] = UInt8(truncatingIfNeeded: mask >> 0)
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}
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return IPv6Address(bytes)!
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}
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fatalError()
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}
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public func maskedAddress() -> IPAddress {
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let subnet = subnetMask().rawValue
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var masked = Data(address.rawValue)
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if subnet.count != masked.count {
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fatalError()
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}
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for i in 0..<subnet.count {
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masked[i] &= subnet[i]
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}
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if subnet.count == 4 {
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return IPv4Address(masked)!
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}
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if subnet.count == 16 {
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return IPv6Address(masked)!
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}
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fatalError()
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}
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}
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