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v0l/socks5/master/lib/socks5.dart
https://raw.githubusercontent.com/v0l/socks5/master/lib/socks5.dart
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1 changed files with 365 additions and 0 deletions
365
lib/networking/socks5.dart
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365
lib/networking/socks5.dart
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library socks;
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import 'dart:async';
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import 'dart:convert';
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import 'dart:io';
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import 'dart:typed_data';
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/// https://tools.ietf.org/html/rfc1928
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/// https://tools.ietf.org/html/rfc1929
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///
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const SOCKSVersion = 0x05;
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const RFC1929Version = 0x01;
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class AuthMethods {
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static const NoAuth = const AuthMethods._(0x00);
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static const GSSApi = const AuthMethods._(0x01);
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static const UsernamePassword = const AuthMethods._(0x02);
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static const NoAcceptableMethods = const AuthMethods._(0xFF);
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final int _value;
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const AuthMethods._(this._value);
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String toString() {
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return const {
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0x00: 'AuthMethods.NoAuth',
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0x01: 'AuthMethods.GSSApi',
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0x02: 'AuthMethods.UsernamePassword',
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0xFF: 'AuthMethods.NoAcceptableMethods'
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}[_value];
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}
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}
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class SOCKSState {
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static const Starting = const SOCKSState._(0x00);
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static const Auth = const SOCKSState._(0x01);
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static const RequestReady = const SOCKSState._(0x02);
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static const Connected = const SOCKSState._(0x03);
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static const AuthStarted = const SOCKSState._(0x04);
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final int _value;
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const SOCKSState._(this._value);
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String toString() {
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return const [
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'SOCKSState.Starting',
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'SOCKSState.Auth',
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'SOCKSState.RequestReady',
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'SOCKSState.Connected',
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'SOCKSState.AuthStarted'
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][_value];
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}
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}
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class SOCKSAddressType {
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static const IPv4 = const SOCKSAddressType._(0x01);
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static const Domain = const SOCKSAddressType._(0x03);
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static const IPv6 = const SOCKSAddressType._(0x04);
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final int _value;
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const SOCKSAddressType._(this._value);
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String toString() {
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return const [
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null,
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'SOCKSAddressType.IPv4',
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null,
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'SOCKSAddressType.Domain',
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'SOCKSAddressType.IPv6',
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][_value];
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}
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}
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class SOCKSCommand {
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static const Connect = const SOCKSCommand._(0x01);
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static const Bind = const SOCKSCommand._(0x02);
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static const UDPAssociate = const SOCKSCommand._(0x03);
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final int _value;
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const SOCKSCommand._(this._value);
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String toString() {
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return const [
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null,
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'SOCKSCommand.Connect',
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'SOCKSCommand.Bind',
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'SOCKSCommand.UDPAssociate',
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][_value];
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}
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}
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class SOCKSReply {
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static const Success = const SOCKSReply._(0x00);
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static const GeneralFailure = const SOCKSReply._(0x01);
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static const ConnectionNotAllowedByRuleset = const SOCKSReply._(0x02);
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static const NetworkUnreachable = const SOCKSReply._(0x03);
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static const HostUnreachable = const SOCKSReply._(0x04);
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static const ConnectionRefused = const SOCKSReply._(0x05);
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static const TTLExpired = const SOCKSReply._(0x06);
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static const CommandNotSupported = const SOCKSReply._(0x07);
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static const AddressTypeNotSupported = const SOCKSReply._(0x08);
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final int _value;
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const SOCKSReply._(this._value);
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String toString() {
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return const [
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'SOCKSReply.Success',
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'SOCKSReply.GeneralFailure',
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'SOCKSReply.ConnectionNotAllowedByRuleset',
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'SOCKSReply.NetworkUnreachable',
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'SOCKSReply.HostUnreachable',
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'SOCKSReply.ConnectionRefused',
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'SOCKSReply.TTLExpired',
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'SOCKSReply.CommandNotSupported',
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'SOCKSReply.AddressTypeNotSupported'
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][_value];
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}
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}
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class SOCKSRequest {
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final int version = SOCKSVersion;
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final SOCKSCommand command;
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final SOCKSAddressType addressType;
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final Uint8List address;
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final int port;
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String getAddressString() {
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if (addressType == SOCKSAddressType.Domain) {
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return AsciiDecoder().convert(address);
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} else if (addressType == SOCKSAddressType.IPv4) {
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return address.join(".");
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} else if (addressType == SOCKSAddressType.IPv6) {
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var ret = List<String>();
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for (var x = 0; x < address.length; x += 2) {
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ret.add(
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"${address[x].toRadixString(16).padLeft(2, "0")}${address[x + 1].toRadixString(16).padLeft(2, "0")}");
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}
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return ret.join(":");
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}
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return null;
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}
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SOCKSRequest({
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this.command,
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this.addressType,
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this.address,
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this.port,
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});
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}
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class SOCKSSocket {
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List<AuthMethods> _auth;
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RawSocket _sock;
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SOCKSRequest _request;
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StreamSubscription<RawSocketEvent> _sockSub;
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StreamSubscription<RawSocketEvent> get subscription => _sockSub;
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SOCKSState _state;
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final StreamController<SOCKSState> _stateStream =
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StreamController<SOCKSState>();
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SOCKSState get state => _state;
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Stream<SOCKSState> get stateStream => _stateStream?.stream;
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/// For username:password auth
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final String username;
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final String password;
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/// Waits for state to change to [SOCKSState.Connected]
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/// If the connection request returns an error from the
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/// socks server it will be thrown as an exception in the stream
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///
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///
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Future<SOCKSState> get _waitForConnect =>
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stateStream.firstWhere((a) => a == SOCKSState.Connected);
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SOCKSSocket(
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RawSocket socket, {
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List<AuthMethods> auth = const [AuthMethods.NoAuth],
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this.username,
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this.password,
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}) {
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_sock = socket;
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_auth = auth;
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_setState(SOCKSState.Starting);
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}
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void _setState(SOCKSState ns) {
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_state = ns;
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_stateStream.add(ns);
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}
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/// Issue connect command to proxy
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///
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Future connect(String domain) async {
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final ds = domain.split(':');
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assert(ds.length == 2, "Domain must contain port, example.com:80");
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_request = SOCKSRequest(
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command: SOCKSCommand.Connect,
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addressType: SOCKSAddressType.Domain,
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address: AsciiEncoder().convert(ds[0]).sublist(0, ds[0].length),
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port: int.tryParse(ds[1]) ?? 80,
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);
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await _start();
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await _waitForConnect;
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}
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Future connectIp(InternetAddress ip, int port) async {
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_request = SOCKSRequest(
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command: SOCKSCommand.Connect,
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addressType: ip.type == InternetAddressType.IPv4
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? SOCKSAddressType.IPv4
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: SOCKSAddressType.IPv6,
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address: ip.rawAddress,
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port: port,
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);
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await _start();
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await _waitForConnect;
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}
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Future close({bool keepOpen = true}) async {
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await _stateStream.close();
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if (!keepOpen) {
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await _sock.close();
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}
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}
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Future _start() async {
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// send auth methods
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_setState(SOCKSState.Auth);
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//print(">> Version: 5, AuthMethods: $_auth");
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_sock.write([
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0x05,
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_auth.length,
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..._auth.map((v) => v._value),
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]);
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_sockSub = _sock.listen((RawSocketEvent ev) {
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switch (ev) {
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case RawSocketEvent.read:
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{
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final have = _sock.available();
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final data = _sock.read(have);
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_handleRead(data);
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break;
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}
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case RawSocketEvent.closed:
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{
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_sockSub.cancel();
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break;
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}
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}
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});
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}
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void _sendUsernamePassword(String uname, String password) {
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if (uname.length > 255 || password.length > 255) {
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throw "Username or Password is too long";
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}
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final data = [
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RFC1929Version,
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uname.length,
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...AsciiEncoder().convert(uname),
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password.length,
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...AsciiEncoder().convert(password)
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];
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//print(">> Sending $username:$password");
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_sock.write(data);
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}
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void _handleRead(Uint8List data) async {
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if (state == SOCKSState.Auth) {
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if (data.length == 2) {
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final version = data[0];
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final auth = AuthMethods._(data[1]);
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//print("<< Version: $version, Auth: $auth");
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if (auth._value == AuthMethods.UsernamePassword._value) {
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_setState(SOCKSState.AuthStarted);
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_sendUsernamePassword(username, password);
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} else if (auth._value == AuthMethods.NoAuth._value) {
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_setState(SOCKSState.RequestReady);
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_writeRequest(_request);
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} else if (auth._value == AuthMethods.NoAcceptableMethods._value) {
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throw "No auth methods acceptable";
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}
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} else {
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throw "Expected 2 bytes";
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}
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} else if (_state == SOCKSState.AuthStarted) {
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if (_auth.contains(AuthMethods.UsernamePassword)) {
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final version = data[0];
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final status = data[1];
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if (version != RFC1929Version || status != 0x00) {
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throw "Invalid username or password";
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} else {
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_setState(SOCKSState.RequestReady);
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_writeRequest(_request);
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}
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}
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} else if (_state == SOCKSState.RequestReady) {
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if (data.length >= 10) {
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final version = data[0];
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final reply = SOCKSReply._(data[1]);
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//data[2] reserved
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final addrType = SOCKSAddressType._(data[3]);
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Uint8List addr;
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var port = 0;
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if (addrType == SOCKSAddressType.Domain) {
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final len = data[4];
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addr = data.sublist(5, 5 + len);
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port = data[5 + len] << 8 | data[6 + len];
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} else if (addrType == SOCKSAddressType.IPv4) {
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addr = data.sublist(5, 9);
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port = data[9] << 8 | data[10];
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} else if (addrType == SOCKSAddressType.IPv6) {
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addr = data.sublist(5, 21);
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port = data[21] << 8 | data[22];
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}
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//print("<< Version: $version, Reply: $reply, AddrType: $addrType, Addr: $addr, Port: $port");
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if (reply._value == SOCKSReply.Success._value) {
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_setState(SOCKSState.Connected);
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} else {
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throw reply;
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}
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} else {
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throw "Expected 10 bytes";
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}
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}
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}
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void _writeRequest(SOCKSRequest req) {
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if (_state == SOCKSState.RequestReady) {
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final data = [
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req.version,
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req.command._value,
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0x00,
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req.addressType._value,
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if (req.addressType == SOCKSAddressType.Domain)
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req.address.lengthInBytes,
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...req.address,
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req.port >> 8,
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req.port & 0xF0,
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];
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//print(">> Version: ${req.version}, Command: ${req.command}, AddrType: ${req.addressType}, Addr: ${req.getAddressString()}, Port: ${req.port}");
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_sock.write(data);
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} else {
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throw "Must be in RequestReady state, current state $_state";
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}
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}
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}
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