104 lines
3.2 KiB
Swift
104 lines
3.2 KiB
Swift
//
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// NETCPLink.swift
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// TunnelKit
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//
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// Created by Davide De Rosa on 5/23/19.
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// Copyright (c) 2019 Davide De Rosa. All rights reserved.
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//
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// https://github.com/passepartoutvpn
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//
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// This file is part of TunnelKit.
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//
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// TunnelKit is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// TunnelKit is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with TunnelKit. If not, see <http://www.gnu.org/licenses/>.
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//
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import Foundation
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import NetworkExtension
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import __TunnelKitOpenVPN
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class NETCPLink: LinkInterface {
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private let impl: NWTCPConnection
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private let maxPacketSize: Int
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init(impl: NWTCPConnection, mtu: Int, maxPacketSize: Int? = nil) {
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self.impl = impl
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self.mtu = mtu
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self.maxPacketSize = maxPacketSize ?? (512 * 1024)
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}
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// MARK: LinkInterface
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let isReliable: Bool = true
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var remoteAddress: String? {
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return (impl.remoteAddress as? NWHostEndpoint)?.hostname
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}
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let mtu: Int
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var packetBufferSize: Int {
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return maxPacketSize
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}
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func setReadHandler(queue: DispatchQueue, _ handler: @escaping ([Data]?, Error?) -> Void) {
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loopReadPackets(queue, Data(), handler)
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}
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private func loopReadPackets(_ queue: DispatchQueue, _ buffer: Data, _ handler: @escaping ([Data]?, Error?) -> Void) {
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// WARNING: runs in Network.framework queue
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impl.readMinimumLength(2, maximumLength: packetBufferSize) { [weak self] (data, error) in
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guard let _ = self else {
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return
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}
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queue.sync {
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guard (error == nil), let data = data else {
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handler(nil, error)
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return
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}
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var newBuffer = buffer
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newBuffer.append(contentsOf: data)
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var until = 0
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let packets = PacketStream.packets(fromStream: newBuffer, until: &until)
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newBuffer = newBuffer.subdata(in: until..<newBuffer.count)
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self?.loopReadPackets(queue, newBuffer, handler)
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handler(packets, nil)
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}
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}
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}
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func writePacket(_ packet: Data, completionHandler: ((Error?) -> Void)?) {
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let stream = PacketStream.stream(fromPacket: packet)
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impl.write(stream) { (error) in
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completionHandler?(error)
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}
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}
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func writePackets(_ packets: [Data], completionHandler: ((Error?) -> Void)?) {
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let stream = PacketStream.stream(fromPackets: packets)
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impl.write(stream) { (error) in
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completionHandler?(error)
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}
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}
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}
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extension NETCPSocket: LinkProducer {
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func link(withMTU mtu: Int) -> LinkInterface {
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return NETCPLink(impl: impl, mtu: mtu)
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}
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}
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