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// SPDX-License-Identifier: MIT
// Copyright © 2018 WireGuard LLC. All Rights Reserved.
import Foundation
import Network
@available(OSX 10.14, iOS 12.0, *)
struct IPAddressRange {
let address: IPAddress
var networkPrefixLength: UInt8
}
// MARK: Converting to and from String
extension IPAddressRange {
init?(from string: String) {
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
}
self.address = address
self.networkPrefixLength = networkPrefixLength
}
func stringRepresentation() -> String {
return "\(address)/\(networkPrefixLength)"
}
}
// MARK: Codable
@available(OSX 10.14, iOS 12.0, *)
extension IPAddressRange: Codable {
public func encode(to encoder: Encoder) throws {
var container = encoder.singleValueContainer()
let addressDataLength: Int
if address is IPv4Address {
addressDataLength = 4
} else if address is IPv6Address {
addressDataLength = 16
} else {
fatalError()
}
var data = Data(capacity: addressDataLength + 1)
data.append(address.rawValue)
data.append(networkPrefixLength)
try container.encode(data)
}
public init(from decoder: Decoder) throws {
let container = try decoder.singleValueContainer()
var data = try container.decode(Data.self)
networkPrefixLength = data.removeLast()
let ipAddressFromData: IPAddress? = {
switch data.count {
case 4: return IPv4Address(data)
case 16: return IPv6Address(data)
default: return nil
}
}()
guard let ipAddress = ipAddressFromData else { throw DecodingError.invalidData }
address = ipAddress
}
enum DecodingError: Error {
case invalidData
}
}
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