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//
// Copyright © 2018 WireGuard LLC. All rights reserved.
//
import Foundation
import CoreData
extension Tunnel {
public func generateProviderConfiguration() -> [String: Any] {
var providerConfiguration = [String: Any]()
providerConfiguration[PCKeys.title.rawValue] = self.title
providerConfiguration[PCKeys.tunnelIdentifier.rawValue] = self.tunnelIdentifier
providerConfiguration[PCKeys.endpoints.rawValue] = peers?.array.compactMap {($0 as? Peer)?.endpoint}.joined(separator: ", ")
providerConfiguration[PCKeys.dns.rawValue] = interface?.dns
providerConfiguration[PCKeys.addresses.rawValue] = interface?.addresses
if let mtu = interface?.mtu, mtu > 0 {
providerConfiguration[PCKeys.mtu.rawValue] = NSNumber(value: mtu)
}
var settingsString = "replace_peers=true\n"
if let interface = interface {
settingsString += generateInterfaceProviderConfiguration(interface)
}
if let peers = peers?.array as? [Peer] {
peers.forEach {
settingsString += generatePeerProviderConfiguration($0)
}
}
providerConfiguration["settings"] = settingsString
return providerConfiguration
}
private func generateInterfaceProviderConfiguration(_ interface: Interface) -> String {
var settingsString = ""
if let hexPrivateKey = base64KeyToHex(interface.privateKey) {
settingsString += "private_key=\(hexPrivateKey)\n"
}
if interface.listenPort > 0 {
settingsString += "listen_port=\(interface.listenPort)\n"
}
if interface.mtu > 0 {
settingsString += "mtu=\(interface.mtu)\n"
}
return settingsString
}
private func generatePeerProviderConfiguration(_ peer: Peer) -> String {
var settingsString = ""
if let hexPublicKey = base64KeyToHex(peer.publicKey) {
settingsString += "public_key=\(hexPublicKey)\n"
}
if let presharedKey = peer.presharedKey {
settingsString += "preshared_key=\(presharedKey)\n"
}
if let endpoint = peer.endpoint {
settingsString += "endpoint=\(endpoint)\n"
}
if peer.persistentKeepalive > 0 {
settingsString += "persistent_keepalive_interval=\(peer.persistentKeepalive)\n"
}
if let allowedIPs = peer.allowedIPs?.commaSeparatedToArray() {
allowedIPs.forEach {
settingsString += "allowed_ip=\($0.trimmingCharacters(in: .whitespaces))\n"
}
}
return settingsString
}
func validate() throws {
let nameRegex = "[a-zA-Z0-9_=+.-]{1,15}"
let nameTest = NSPredicate(format: "SELF MATCHES %@", nameRegex)
guard let title = title, nameTest.evaluate(with: title) else {
throw TunnelValidationError.invalidTitle
}
let fetchRequest: NSFetchRequest<Tunnel> = Tunnel.fetchRequest()
fetchRequest.predicate = NSPredicate(format: "title == %@", title)
guard (try? managedObjectContext?.count(for: fetchRequest)) == 1 else {
throw TunnelValidationError.titleExists
}
guard let interface = interface else {
throw TunnelValidationError.nilInterface
}
try interface.validate()
guard let peers = peers else {
throw TunnelValidationError.nilPeers
}
try peers.forEach {
guard let peer = $0 as? Peer else {
throw TunnelValidationError.invalidPeer
}
try peer.validate()
}
}
static func fromConfig(_ text: String, context: NSManagedObjectContext) throws -> Tunnel {
let lines = text.split(separator: "\n")
var currentPeer: Peer?
var isInInterfaceSection = false
var tunnel: Tunnel!
context.performAndWait {
tunnel = Tunnel(context: context)
tunnel.interface = Interface(context: context)
}
tunnel.tunnelIdentifier = UUID().uuidString
for line in lines {
var trimmedLine: String
if let commentRange = line.range(of: "#") {
trimmedLine = String(line[..<commentRange.lowerBound])
} else {
trimmedLine = String(line)
}
trimmedLine = trimmedLine.trimmingCharacters(in: .whitespaces)
guard trimmedLine.count > 0 else { continue }
if "[interface]" == line.lowercased() {
currentPeer = nil
isInInterfaceSection = true
} else if "[peer]" == line.lowercased() {
context.performAndWait { currentPeer = Peer(context: context) }
tunnel.insertIntoPeers(currentPeer!, at: tunnel.peers?.count ?? 0)
isInInterfaceSection = false
} else if isInInterfaceSection, let attribute = Attribute.match(line: String(line)) {
try tunnel.interface!.parse(attribute: attribute)
} else if let currentPeer = currentPeer, let attribute = Attribute.match(line: String(line)) {
try currentPeer.parse(attribute: attribute)
} else {
throw TunnelParseError.invalidLine(String(line))
}
}
if !isInInterfaceSection && currentPeer == nil {
throw TunnelParseError.noConfigInfo
}
return tunnel
}
func export() -> String {
var exportString = ""
if let interfaceExport = self.interface?.export() {
exportString.append(interfaceExport)
}
if let peers = peers?.array as? [Peer] {
peers.forEach {
exportString.append($0.export())
}
}
return exportString
}
}
private func base64KeyToHex(_ base64: String?) -> String? {
guard let base64 = base64 else {
return nil
}
guard base64.count == 44 else {
return nil
}
guard base64.last == "=" else {
return nil
}
guard let keyData = Data(base64Encoded: base64) else {
return nil
}
guard keyData.count == 32 else {
return nil
}
let hexKey = keyData.reduce("") {$0 + String(format: "%02x", $1)}
return hexKey
}
enum TunnelValidationError: Error {
case invalidTitle
case titleExists
case nilInterface
case nilPeers
case invalidPeer
}
enum TunnelParseError: Error {
case invalidLine(_ line: String)
case noConfigInfo
}
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