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dartssh.dart
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dartssh.dart
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// Copyright 2019 dartssh developers
// Use of this source code is governed by a MIT-style license that can be found in the LICENSE file.
import 'dart:convert';
import 'dart:io';
import 'dart:typed_data';
import 'package:args/args.dart';
import 'package:dartssh2/client.dart';
import 'package:dartssh2/identity.dart';
import 'package:dartssh2/pem.dart';
import 'package:dartssh2/ssh.dart';
import 'package:dartssh2/transport.dart';
Identity? identity;
SSHClient? client;
Channel? forwardChannel;
void main(List<String> arguments) async {
stdin.lineMode = false;
stdin.echoMode = false;
ProcessSignal.sigint.watch().listen((_) {
if (client != null) send(Uint8List.fromList(<int>[3]));
});
ProcessSignal.sigwinch.watch().listen((_) {
if (client != null) {
client!
.setTerminalWindowSize(stdout.terminalColumns, stdout.terminalLines);
}
});
exitCode = await ssh(
arguments,
stdin,
(_, Uint8List v) => stdout.write(utf8.decode(v)),
() => exit(0),
termWidth: stdout.terminalColumns,
termHeight: stdout.terminalLines,
);
}
void send(Uint8List x) {
if (forwardChannel != null) {
client!.sendToChannel(forwardChannel!, x);
} else {
client!.sendChannelData(x);
}
}
Future<int> ssh(
List<String> arguments,
Stream<List<int>> input,
ResponseCallback response,
VoidCallback done, {
int termWidth = 80,
int termHeight = 25,
}) async {
final argParser = ArgParser()
..addOption('login', abbr: 'l')
..addOption('identity', abbr: 'i')
..addOption('password')
..addOption('tunnel')
..addOption('kex')
..addOption('key')
..addOption('cipher')
..addOption('mac')
..addFlag('debug')
..addFlag('trace')
..addFlag('agentForwarding', abbr: 'A');
final ArgResults args = argParser.parse(arguments);
identity = null;
client = null;
forwardChannel = null;
if (args.rest.length != 1) {
print('usage: ssh -l login url [args]');
print(argParser.usage);
return 1;
}
final String host = args.rest.first;
final String? login = args['login'];
final String? identityFile = args['identity'];
final String? tunnel = args['tunnel'];
if (login == null || login.isEmpty) {
print('no login specified');
return 1;
}
if (tunnel != null && tunnel.split(':').length != 2) {
print('tunnel target should be specified host:port');
return 2;
}
applyCipherSuiteOverrides(
args['kex'], args['key'], args['cipher'], args['mac']);
try {
client = SSHClient(
hostport: parseUri(host),
login: login,
print: print,
termWidth: termWidth,
termHeight: termHeight,
termvar: Platform.environment['TERM'] ?? 'xterm',
agentForwarding: args['agentForwarding'] == true,
debugPrint: args['debug'] == true ? print : null,
tracePrint: args['trace'] == true ? print : null,
getPassword: (args['password'] != null)
? () => utf8.encode(args['password']) as Uint8List
: null,
response: response,
loadIdentity: () {
if (identity == null && identityFile != null) {
identity = parsePem(File(identityFile).readAsStringSync());
}
return identity;
},
disconnected: done,
startShell: tunnel == null,
success: tunnel == null
? null
: () {
List<String> tunnelTarget = tunnel.split(':');
forwardChannel = client!.openTcpChannel(
'127.0.0.1',
1234,
tunnelTarget[0],
int.parse(tunnelTarget[1]),
(_, Uint8List? m) => response(client!, m!),
);
},
);
await for (String x in input.transform(utf8.decoder)) {
send(utf8.encode(x) as Uint8List);
}
} catch (error, stacktrace) {
print('ssh: exception: $error: $stacktrace');
return -1;
}
return 0;
}