55 lines
1.9 KiB
Swift
55 lines
1.9 KiB
Swift
// SPDX-License-Identifier: MIT
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// Copyright © 2018 WireGuard LLC. All Rights Reserved.
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import Foundation
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import Network
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struct IPAddressRange {
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let address: IPAddress
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var 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 {
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var stringRepresentation: String {
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return "\(address)/\(networkPrefixLength)"
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}
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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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}
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