Fix IPv6 parsing in API access methods and custom DNS

ios/CHANGELOG.md

@@ -24,6 +24,7 @@ Line wrap the file at 100 chars.                                              Th
 ## Unreleased
 ### Added
 - Add a new access method that uses the encrypted DNS proxy to reach our API.
+- Fix IPv6 parsing in API access
 
 ## [2024.7 - 2024-09-16]
 ### Added

ios/MullvadTypes/AnyIPAddress.swift

@@ -69,6 +69,10 @@ public enum AnyIPAddress: IPAddress, Codable, Equatable, CustomDebugStringConver
     }
 
     public init?(_ string: String) {
+        // Arbitrary integers should not be allowed by us and need to be handled separately
+        // since Apple allows them.
+        guard Int(string) == nil else { return nil }
+
         if let ipv4Address = IPv4Address(string) {
             self = .ipv4(ipv4Address)
         } else if let ipv6Address = IPv6Address(string) {

ios/MullvadVPN.xcodeproj/project.pbxproj

@@ -609,6 +609,7 @@
 		7AEF7F1A2AD00F52006FE45D /* AppMessageHandler.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7AEF7F192AD00F52006FE45D /* AppMessageHandler.swift */; };
 		7AF10EB22ADE859200C090B9 /* AlertViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7AF10EB12ADE859200C090B9 /* AlertViewController.swift */; };
 		7AF10EB42ADE85BC00C090B9 /* RelayFilterCoordinator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7AF10EB32ADE85BC00C090B9 /* RelayFilterCoordinator.swift */; };
+		7AF36A9A2CA2964200E1D497 /* AnyIPAddressTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7AF36A992CA2964000E1D497 /* AnyIPAddressTests.swift */; };
 		7AF6E5F02A95051E00F2679D /* RouterBlockDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7AF6E5EF2A95051E00F2679D /* RouterBlockDelegate.swift */; };
 		7AF9BE882A30C62100DBFEDB /* SelectableSettingsCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7A1A264A2A29D65E00B978AA /* SelectableSettingsCell.swift */; };
 		7AF9BE8C2A321D1F00DBFEDB /* RelayFilter.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7AF9BE8A2A321BEF00DBFEDB /* RelayFilter.swift */; };
@@ -1918,6 +1919,7 @@
 		7AEF7F192AD00F52006FE45D /* AppMessageHandler.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AppMessageHandler.swift; sourceTree = "<group>"; };
 		7AF10EB12ADE859200C090B9 /* AlertViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AlertViewController.swift; sourceTree = "<group>"; };
 		7AF10EB32ADE85BC00C090B9 /* RelayFilterCoordinator.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = RelayFilterCoordinator.swift; sourceTree = "<group>"; };
+		7AF36A992CA2964000E1D497 /* AnyIPAddressTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AnyIPAddressTests.swift; sourceTree = "<group>"; };
 		7AF6E5EF2A95051E00F2679D /* RouterBlockDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RouterBlockDelegate.swift; sourceTree = "<group>"; };
 		7AF9BE8A2A321BEF00DBFEDB /* RelayFilter.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RelayFilter.swift; sourceTree = "<group>"; };
 		7AF9BE8D2A331C7B00DBFEDB /* RelayFilterViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RelayFilterViewModel.swift; sourceTree = "<group>"; };
@@ -2482,6 +2484,7 @@
 		440E9EF92BDA95FC00B1FD11 /* MullvadTypes */ = {
 			isa = PBXGroup;
 			children = (
+				7AF36A992CA2964000E1D497 /* AnyIPAddressTests.swift */,
 				58FBFBF0291630700020E046 /* DurationTests.swift */,
 				58C3FA672A385C89006A450A /* FileCacheTests.swift */,
 				582A8A3928BCE19B00D0F9FB /* FixedWidthIntegerArithmeticsTests.swift */,
@@ -5288,6 +5291,7 @@
 				A9A5FA3F2ACB05D90083449F /* DeviceCheckRemoteService.swift in Sources */,
 				A9A5FA402ACB05D90083449F /* DeviceCheckRemoteServiceProtocol.swift in Sources */,
 				A9A5FA412ACB05D90083449F /* DeviceStateAccessor.swift in Sources */,
+				7AF36A9A2CA2964200E1D497 /* AnyIPAddressTests.swift in Sources */,
 				A9A5FA422ACB05D90083449F /* DeviceStateAccessorProtocol.swift in Sources */,
 				7A5869C32B5820CE00640D27 /* IPOverrideRepositoryTests.swift in Sources */,
 				A9A5FA392ACB05910083449F /* UIColor+Palette.swift in Sources */,

ios/MullvadVPN/Coordinators/Settings/APIAccess/Models/AccessMethodViewModel+Persistent.swift

@@ -216,8 +216,7 @@ private enum CommonValidators {
         return .success(portNumber)
     }
 
-    /// Parse IP address from string by first running the input via regular expression before parsing it using Apple's facilities which are known to accept all kind of
-    /// malformed input.
+    /// Parse IP address from string by using Apple's facilities.
     ///
     /// - Parameters:
     ///   - value: a string input.
@@ -227,12 +226,7 @@ private enum CommonValidators {
         from value: String,
         context: AccessMethodFieldValidationError.Context
     ) -> Result<AnyIPAddress, AccessMethodFieldValidationError> {
-        let range = NSRange(value.startIndex ..< value.endIndex, in: value)
-
-        let regexMatch = NSRegularExpression.ipv4RegularExpression.firstMatch(in: value, range: range)
-            ?? NSRegularExpression.ipv6RegularExpression.firstMatch(in: value, range: range)
-
-        if regexMatch?.range == range, let address = AnyIPAddress(value) {
+        if let address = AnyIPAddress(value) {
             return .success(address)
         } else {
             return .failure(AccessMethodFieldValidationError(kind: .invalidIPAddress, field: .server, context: context))

ios/MullvadVPNTests/MullvadTypes/AnyIPAddressTests.swift

@@ -0,0 +1,33 @@
+//
+//  AnyIPAddressTests.swift
+//  MullvadVPN
+//
+//  Created by Jon Petersson on 2024-09-24.
+//  Copyright © 2024 Mullvad VPN AB. All rights reserved.
+//
+
+@testable import MullvadTypes
+import XCTest
+
+final class AnyIPAddressTests: XCTestCase {
+    func testAnyIPAddressFromString() {
+        XCTAssertNil(AnyIPAddress("000"))
+        XCTAssertNil(AnyIPAddress("1"))
+        XCTAssertNil(AnyIPAddress("abcde"))
+        XCTAssertNil(AnyIPAddress("0.1.2.3.5"))
+        XCTAssertNil(AnyIPAddress("2a03:1b20:1:f011:bb09"))
+
+        XCTAssertNotNil(AnyIPAddress("0.0"))
+        XCTAssertNotNil(AnyIPAddress("0.1"))
+        XCTAssertNotNil(AnyIPAddress("192.168.0.1"))
+        XCTAssertNotNil(AnyIPAddress("2a03:1b20:1:f011::bb09"))
+        XCTAssertNotNil(AnyIPAddress("FE80:0000:0000:0000:0202:B3FF:FE1E:8329"))
+        XCTAssertNotNil(AnyIPAddress("2001:db8::42:0:8a2e:370:7334"))
+        XCTAssertNotNil(AnyIPAddress("::1"))
+        XCTAssertNotNil(AnyIPAddress("::"))
+        XCTAssertNotNil(AnyIPAddress("::ffff:192.168.1.1"))
+        XCTAssertNotNil(AnyIPAddress("fe80::1ff:fe23:4567:890a"))
+        XCTAssertNotNil(AnyIPAddress("ff02::1"))
+        XCTAssertNotNil(AnyIPAddress("2001:0db8:85a3::8a2e:0370:7334"))
+    }
+}