tunnelkit/Sources/TunnelKitOpenVPNAppExtension/NEUDPLink.swift

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//
// NEUDPLink.swift
// TunnelKit
//
// Created by Davide De Rosa on 5/23/19.
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// Copyright (c) 2022 Davide De Rosa. All rights reserved.
//
// https://github.com/passepartoutvpn
//
// This file is part of TunnelKit.
//
// TunnelKit is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// TunnelKit is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with TunnelKit. If not, see <http://www.gnu.org/licenses/>.
//
import Foundation
import NetworkExtension
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import TunnelKitCore
import TunnelKitAppExtension
class NEUDPLink: LinkInterface {
private let impl: NWUDPSession
private let maxDatagrams: Int
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let xorMask: UInt8
init(impl: NWUDPSession, maxDatagrams: Int? = nil, xorMask: UInt8?) {
self.impl = impl
self.maxDatagrams = maxDatagrams ?? 200
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self.xorMask = xorMask ?? 0
}
// MARK: LinkInterface
let isReliable: Bool = false
var remoteAddress: String? {
return (impl.resolvedEndpoint as? NWHostEndpoint)?.hostname
}
var packetBufferSize: Int {
return maxDatagrams
}
func setReadHandler(queue: DispatchQueue, _ handler: @escaping ([Data]?, Error?) -> Void) {
// WARNING: runs in Network.framework queue
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impl.setReadHandler({ [weak self] packets, error in
guard let self = self else {
return
}
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var packetsToUse: [Data]?
if let packets = packets, self.xorMask != 0 {
packetsToUse = packets.map { packet in
Data(bytes: packet.map { $0 ^ self.xorMask }, count: packet.count)
}
} else {
packetsToUse = packets
}
queue.sync {
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handler(packetsToUse, error)
}
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}, maxDatagrams: maxDatagrams)
}
func writePacket(_ packet: Data, completionHandler: ((Error?) -> Void)?) {
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var dataToUse: Data
if xorMask != 0 {
dataToUse = Data(bytes: packet.map { $0 ^ xorMask }, count: packet.count)
} else {
dataToUse = packet
}
impl.writeDatagram(dataToUse) { error in
completionHandler?(error)
}
}
func writePackets(_ packets: [Data], completionHandler: ((Error?) -> Void)?) {
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var packetsToUse: [Data]
if xorMask != 0 {
packetsToUse = packets.map { packet in
Data(bytes: packet.map { $0 ^ xorMask }, count: packet.count)
}
} else {
packetsToUse = packets
}
impl.writeMultipleDatagrams(packetsToUse) { error in
completionHandler?(error)
}
}
}
extension NEUDPSocket: LinkProducer {
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public func link(xorMask: UInt8?) -> LinkInterface {
return NEUDPLink(impl: impl, maxDatagrams: nil, xorMask: xorMask)
}
}