141 lines
4.6 KiB
Swift
141 lines
4.6 KiB
Swift
//
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// IPValidator.swift
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// WireGuard
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//
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// Created by Jeroen Leenarts on 15-08-18.
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// Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All rights reserved.
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//
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import Foundation
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enum AddressType {
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case IPv6, IPv4, other
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}
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public enum EndpointValidationError: Error {
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case noIpAndPort(String)
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case invalidIP(String)
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case invalidPort(String)
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var localizedDescription: String {
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switch self {
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case .noIpAndPort:
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return NSLocalizedString("EndpointValidationError.noIpAndPort", comment: "Error message for malformed endpoint.")
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case .invalidIP:
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return NSLocalizedString("EndpointValidationError.invalidIP", comment: "Error message for invalid endpoint ip.")
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case .invalidPort:
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return NSLocalizedString("EndpointValidationError.invalidPort", comment: "Error message invalid endpoint port.")
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}
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}
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}
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struct Endpoint {
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var ipAddress: String
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var port: Int32?
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var addressType: AddressType
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init?(endpointString: String, needsPort: Bool = true) throws {
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var ipString: String
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if needsPort {
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guard let range = endpointString.range(of: ":", options: .backwards, range: nil, locale: nil) else {
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throw EndpointValidationError.noIpAndPort(endpointString)
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}
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ipString = String(endpointString[..<range.lowerBound])
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let portString = endpointString[range.upperBound...]
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guard let port = Int32(portString), port > 0 else {
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throw EndpointValidationError.invalidPort(String(portString/*parts[1]*/))
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}
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self.port = port
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} else {
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ipString = endpointString
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}
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ipString = ipString.replacingOccurrences(of: "[", with: "").replacingOccurrences(of: "]", with: "")
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ipAddress = String(ipString)
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let addressType = validateIpAddress(ipToValidate: ipAddress)
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guard addressType == .IPv4 || addressType == .IPv6 else {
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throw EndpointValidationError.invalidIP(ipAddress)
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}
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self.addressType = addressType
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}
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}
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func validateIpAddress(ipToValidate: String) -> AddressType {
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var sin = sockaddr_in()
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if ipToValidate.withCString({ cstring in inet_pton(AF_INET, cstring, &sin.sin_addr) }) == 1 {
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// IPv4 peer.
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return .IPv4
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}
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var sin6 = sockaddr_in6()
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if ipToValidate.withCString({ cstring in inet_pton(AF_INET6, cstring, &sin6.sin6_addr) }) == 1 {
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// IPv6 peer.
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return .IPv6
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}
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return .other
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}
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public enum CIDRAddressValidationError: Error {
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case noIpAndSubnet(String)
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case invalidIP(String)
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case invalidSubnet(String)
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var localizedDescription: String {
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switch self {
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case .noIpAndSubnet:
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return NSLocalizedString("CIDRAddressValidationError", comment: "Error message for malformed CIDR address.")
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case .invalidIP:
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return NSLocalizedString("CIDRAddressValidationError", comment: "Error message for invalid address ip.")
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case .invalidSubnet:
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return NSLocalizedString("CIDRAddressValidationError", comment: "Error message invalid address subnet.")
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}
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}
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}
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struct CIDRAddress {
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var ipAddress: String
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var subnet: Int32
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var addressType: AddressType
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init?(stringRepresentation: String) throws {
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guard let range = stringRepresentation.range(of: "/", options: .backwards, range: nil, locale: nil) else {
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throw CIDRAddressValidationError.noIpAndSubnet(stringRepresentation)
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}
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let ipString = stringRepresentation[..<range.lowerBound].replacingOccurrences(of: "[", with: "").replacingOccurrences(of: "]", with: "")
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let subnetString = stringRepresentation[range.upperBound...]
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guard let subnet = Int32(subnetString) else {
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throw CIDRAddressValidationError.invalidSubnet(String(subnetString))
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}
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ipAddress = String(ipString)
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let addressType = validateIpAddress(ipToValidate: ipAddress)
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guard addressType == .IPv4 || addressType == .IPv6 else {
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throw CIDRAddressValidationError.invalidIP(ipAddress)
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}
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self.addressType = addressType
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self.subnet = subnet
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}
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var subnetString: String {
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// We could calculate these.
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var bitMask: UInt32 = 0b11111111111111111111111111111111
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bitMask = bitMask << (32 - subnet)
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let first = UInt8(truncatingIfNeeded: bitMask >> 24)
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let second = UInt8(truncatingIfNeeded: bitMask >> 16 )
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let third = UInt8(truncatingIfNeeded: bitMask >> 8)
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let fourth = UInt8(truncatingIfNeeded: bitMask)
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return "\(first).\(second).\(third).\(fourth)"
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}
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}
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