Move model helpers to model directory
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld
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// 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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extension TunnelConfiguration {
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enum ParserState {
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case inInterfaceSection
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case inPeerSection
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case notInASection
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}
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enum ParseError: Error {
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case invalidLine(_ line: String.SubSequence)
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case noInterface
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case invalidInterface
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case multipleInterfaces
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case multiplePeersWithSamePublicKey
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case invalidPeer
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}
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//swiftlint:disable:next function_body_length cyclomatic_complexity
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convenience init(fromWgQuickConfig wgQuickConfig: String, called name: String? = nil) throws {
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var interfaceConfiguration: InterfaceConfiguration?
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var peerConfigurations = [PeerConfiguration]()
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let lines = wgQuickConfig.split(separator: "\n")
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var parserState = ParserState.notInASection
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var attributes = [String: String]()
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for (lineIndex, line) in lines.enumerated() {
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var trimmedLine: String
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if let commentRange = line.range(of: "#") {
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trimmedLine = String(line[..<commentRange.lowerBound])
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} else {
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trimmedLine = String(line)
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}
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trimmedLine = trimmedLine.trimmingCharacters(in: .whitespaces)
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guard !trimmedLine.isEmpty else { continue }
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let lowercasedLine = line.lowercased()
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if let equalsIndex = line.firstIndex(of: "=") {
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// Line contains an attribute
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let key = line[..<equalsIndex].trimmingCharacters(in: .whitespaces).lowercased()
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let value = line[line.index(equalsIndex, offsetBy: 1)...].trimmingCharacters(in: .whitespaces)
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let keysWithMultipleEntriesAllowed: Set<String> = ["address", "allowedips", "dns"]
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if let presentValue = attributes[key], keysWithMultipleEntriesAllowed.contains(key) {
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attributes[key] = presentValue + "," + value
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} else {
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attributes[key] = value
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}
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} else if lowercasedLine != "[interface]" && lowercasedLine != "[peer]" {
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throw ParseError.invalidLine(line)
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}
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let isLastLine = lineIndex == lines.count - 1
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if isLastLine || lowercasedLine == "[interface]" || lowercasedLine == "[peer]" {
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// Previous section has ended; process the attributes collected so far
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if parserState == .inInterfaceSection {
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guard let interface = TunnelConfiguration.collate(interfaceAttributes: attributes) else { throw ParseError.invalidInterface }
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guard interfaceConfiguration == nil else { throw ParseError.multipleInterfaces }
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interfaceConfiguration = interface
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} else if parserState == .inPeerSection {
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guard let peer = TunnelConfiguration.collate(peerAttributes: attributes) else { throw ParseError.invalidPeer }
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peerConfigurations.append(peer)
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}
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}
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if lowercasedLine == "[interface]" {
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parserState = .inInterfaceSection
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attributes.removeAll()
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} else if lowercasedLine == "[peer]" {
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parserState = .inPeerSection
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attributes.removeAll()
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}
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}
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let peerPublicKeysArray = peerConfigurations.map { $0.publicKey }
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let peerPublicKeysSet = Set<Data>(peerPublicKeysArray)
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if peerPublicKeysArray.count != peerPublicKeysSet.count {
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throw ParseError.multiplePeersWithSamePublicKey
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}
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if let interfaceConfiguration = interfaceConfiguration {
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self.init(name: name, interface: interfaceConfiguration, peers: peerConfigurations)
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} else {
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throw ParseError.noInterface
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}
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}
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func asWgQuickConfig() -> String {
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var output = "[Interface]\n"
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output.append("PrivateKey = \(interface.privateKey.base64EncodedString())\n")
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if let listenPort = interface.listenPort {
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output.append("ListenPort = \(listenPort)\n")
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}
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if !interface.addresses.isEmpty {
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let addressString = interface.addresses.map { $0.stringRepresentation }.joined(separator: ", ")
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output.append("Address = \(addressString)\n")
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}
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if !interface.dns.isEmpty {
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let dnsString = interface.dns.map { $0.stringRepresentation }.joined(separator: ", ")
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output.append("DNS = \(dnsString)\n")
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}
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if let mtu = interface.mtu {
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output.append("MTU = \(mtu)\n")
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}
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for peer in peers {
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output.append("\n[Peer]\n")
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output.append("PublicKey = \(peer.publicKey.base64EncodedString())\n")
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if let preSharedKey = peer.preSharedKey {
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output.append("PresharedKey = \(preSharedKey.base64EncodedString())\n")
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}
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if !peer.allowedIPs.isEmpty {
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let allowedIPsString = peer.allowedIPs.map { $0.stringRepresentation }.joined(separator: ", ")
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output.append("AllowedIPs = \(allowedIPsString)\n")
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}
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if let endpoint = peer.endpoint {
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output.append("Endpoint = \(endpoint.stringRepresentation)\n")
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}
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if let persistentKeepAlive = peer.persistentKeepAlive {
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output.append("PersistentKeepalive = \(persistentKeepAlive)\n")
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}
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}
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return output
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}
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//swiftlint:disable:next cyclomatic_complexity
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private static func collate(interfaceAttributes attributes: [String: String]) -> InterfaceConfiguration? {
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// required wg fields
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guard let privateKeyString = attributes["privatekey"] else { return nil }
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guard let privateKey = Data(base64Encoded: privateKeyString), privateKey.count == TunnelConfiguration.keyLength else { return nil }
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var interface = InterfaceConfiguration(privateKey: privateKey)
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// other wg fields
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if let listenPortString = attributes["listenport"] {
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guard let listenPort = UInt16(listenPortString) else { return nil }
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interface.listenPort = listenPort
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}
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// wg-quick fields
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if let addressesString = attributes["address"] {
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var addresses = [IPAddressRange]()
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for addressString in addressesString.splitToArray(trimmingCharacters: .whitespaces) {
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guard let address = IPAddressRange(from: addressString) else { return nil }
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addresses.append(address)
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}
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interface.addresses = addresses
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}
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if let dnsString = attributes["dns"] {
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var dnsServers = [DNSServer]()
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for dnsServerString in dnsString.splitToArray(trimmingCharacters: .whitespaces) {
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guard let dnsServer = DNSServer(from: dnsServerString) else { return nil }
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dnsServers.append(dnsServer)
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}
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interface.dns = dnsServers
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}
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if let mtuString = attributes["mtu"] {
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guard let mtu = UInt16(mtuString) else { return nil }
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interface.mtu = mtu
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}
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return interface
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}
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//swiftlint:disable:next cyclomatic_complexity
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private static func collate(peerAttributes attributes: [String: String]) -> PeerConfiguration? {
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// required wg fields
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guard let publicKeyString = attributes["publickey"] else { return nil }
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guard let publicKey = Data(base64Encoded: publicKeyString), publicKey.count == TunnelConfiguration.keyLength else { return nil }
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var peer = PeerConfiguration(publicKey: publicKey)
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// wg fields
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if let preSharedKeyString = attributes["presharedkey"] {
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guard let preSharedKey = Data(base64Encoded: preSharedKeyString), preSharedKey.count == TunnelConfiguration.keyLength else { return nil }
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peer.preSharedKey = preSharedKey
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}
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if let allowedIPsString = attributes["allowedips"] {
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var allowedIPs = [IPAddressRange]()
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for allowedIPString in allowedIPsString.splitToArray(trimmingCharacters: .whitespacesAndNewlines) {
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guard let allowedIP = IPAddressRange(from: allowedIPString) else { return nil }
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allowedIPs.append(allowedIP)
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}
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peer.allowedIPs = allowedIPs
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}
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if let endpointString = attributes["endpoint"] {
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guard let endpoint = Endpoint(from: endpointString) else { return nil }
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peer.endpoint = endpoint
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}
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if let persistentKeepAliveString = attributes["persistentkeepalive"] {
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guard let persistentKeepAlive = UInt16(persistentKeepAliveString) else { return nil }
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peer.persistentKeepAlive = persistentKeepAlive
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}
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return peer
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}
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}
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