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qttelnet.cpp
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/****************************************************************************
**
** This file is part of a Qt Solutions component.
**
** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Qt Software Information ([email protected])
**
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Solutions Commercial License Agreement provided
** with the Software or, alternatively, in accordance with the terms
** contained in a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** Please note Third Party Software included with Qt Solutions may impose
** additional restrictions and it is the user's responsibility to ensure
** that they have met the licensing requirements of the GPL, LGPL, or Qt
** Solutions Commercial license and the relevant license of the Third
** Party Software they are using.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at [email protected].
**
****************************************************************************/
/*!
\class QtTelnet
\brief The QtTelnet class proveds an API to connect to Telnet servers,
issue commands and receive replies.
When a QtTelnet object has been created, you need to call
connectToHost() to establish a connection with a Telnet server.
When the connection is established the connected() signal is
emitted. At this point you should call login(). The
QtTelnet object will emit connectionError() if the connection
fails, and authenticationFailed() if the login() failed.
Once the connection has been successfully established and
you've logged in you can send control messages using sendControl()
and data using sendData(). Connect to the message() signal to
receive data from the Telnet server. The connection is closed with
close().
You can use your own socket if you call setSocket() before
connecting. The socket used by QtTelnet is available from
socket().
*/
#include "qttelnet.h"
#include <QtNetwork/QTcpSocket>
#include <QtCore/QList>
#include <QtCore/QMap>
#include <QtCore/QPair>
#include <QtCore/QVariant>
#include <QtCore/QSocketNotifier>
#include <QtCore/QBuffer>
#include <QtCore/QVarLengthArray>
#ifdef Q_WS_WIN
# include <winsock2.h>
#endif
#if defined (Q_OS_UNIX)
# include <sys/types.h>
# include <sys/socket.h>
# include <netinet/in.h>
#endif
// #define QTTELNET_DEBUG
#ifdef QTTELNET_DEBUG
#include <QtCore/QDebug>
#endif
class QtTelnetAuth
{
public:
enum State { AuthIntermediate, AuthSuccess, AuthFailure };
QtTelnetAuth(char code) : st(AuthIntermediate), cd(code) {};
virtual ~QtTelnetAuth() {}
int code() const { return cd; }
State state() const { return st; }
void setState(State state) { st = state; };
virtual QByteArray authStep(const QByteArray &data) = 0;
private:
State st;
int cd;
};
class QtTelnetReceiveBuffer
{
public:
QtTelnetReceiveBuffer() : bytesAvailable(0) {}
void append(const QByteArray &data) { buffers.append(data); }
void push_back(const QByteArray &data) { buffers.prepend(data); }
long size() const { return bytesAvailable; }
QByteArray readAll()
{
QByteArray a;
while (!buffers.isEmpty()) {
a.append(buffers.takeFirst());
}
return a;
}
private:
QList<QByteArray> buffers;
long bytesAvailable;
};
namespace Common // RFC854
{
// Commands
const uchar CEOF = 236;
const uchar SUSP = 237;
const uchar ABORT = 238;
const uchar SE = 240;
const uchar NOP = 241;
const uchar DM = 242;
const uchar BRK = 243;
const uchar IP = 244;
const uchar AO = 245;
const uchar AYT = 246;
const uchar EC = 247;
const uchar EL = 248;
const uchar GA = 249;
const uchar SB = 250;
const uchar WILL = 251;
const uchar WONT = 252;
const uchar DO = 253;
const uchar DONT = 254;
const uchar IAC = 255;
// Types
const char IS = 0;
const char SEND = 1;
const char Authentication = 37; // RFC1416,
// implemented to always return NULL
const char SuppressGoAhead = 3; // RFC858
const char Echo = 1; // RFC857, not implemented (returns WONT/DONT)
const char LineMode = 34; // RFC1184, implemented
const uchar LineModeEOF = 236, // RFC1184, not implemented
LineModeSUSP = 237,
LineModeABORT = 238;
const char Status = 5; // RFC859, should be implemented!
const char Logout = 18; // RFC727, implemented
const char TerminalType = 24; // RFC1091,
// implemented to always return UNKNOWN
const char NAWS = 31; // RFC1073, implemented
const char TerminalSpeed = 32; // RFC1079, not implemented
const char FlowControl = 33; // RFC1372, should be implemented?
const char XDisplayLocation = 35; // RFC1096, not implemented
const char EnvironmentOld = 36; // RFC1408, should not be implemented!
const char Environment = 39; // RFC1572, should be implemented
const char Encrypt = 38; // RFC2946, not implemented
#ifdef QTTELNET_DEBUG
QString typeStr(char op)
{
QString str;
switch (op) {
case IS:
str = "IS";
break;
case SEND:
str = "SEND";
break;
default:
str = QString("Unknown common type (%1)").arg(op);
}
return str;
}
QString operationStr(char op)
{
QString str;
switch (quint8(op)) {
case quint8(WILL):
str = "WILL";
break;
case quint8(WONT):
str = "WONT";
break;
case quint8(DO):
str = "DO";
break;
case quint8(DONT):
str = "DONT";
break;
case quint8(SB):
str = "SB";
break;
default:
str = QString("Unknown operation (%1)").arg(quint8(op));
}
return str;
}
QString optionStr(char op)
{
QString str;
switch (op) {
case Authentication:
str = "AUTHENTICATION";
break;
case SuppressGoAhead:
str = "SUPPRESS GO AHEAD";
break;
case Echo:
str = "ECHO";
break;
case LineMode:
str = "LINEMODE";
break;
case Status:
str = "STATUS";
break;
case Logout:
str = "LOGOUT";
break;
case TerminalType:
str = "TERMINAL-TYPE";
break;
case TerminalSpeed:
str = "TERMINAL-SPEED";
break;
case NAWS:
str = "NAWS";
break;
case FlowControl:
str = "TOGGLE-FLOW-CONTROL";
break;
case XDisplayLocation:
str = "X-DISPLAY-LOCATION";
break;
case EnvironmentOld:
str = "ENVIRON";
break;
case Environment:
str = "NEW-ENVIRON";
break;
case Encrypt:
str = "ENCRYPT";
break;
default:
str = QString("Unknown option (%1)").arg(op);
}
return str;
}
#endif
};
namespace Auth // RFC1416
{
enum Auth
{
REPLY = 2,
NAME
};
enum Types
{
AUTHNULL, // Can't have enum values named NULL :/
KERBEROS_V4,
KERBEROS_V5,
SPX,
SRA = 6,
LOKI = 10
};
enum Modifiers
{
AUTH_WHO_MASK = 1,
AUTH_CLIENT_TO_SERVER = 0,
AUTH_SERVER_TO_CLIENT = 1,
AUTH_HOW_MASK = 2,
AUTH_HOW_ONE_WAY = 0,
AUTH_HOW_MUTUAL = 2
};
enum SRA
{
SRA_KEY = 0,
SRA_USER = 1,
SRA_CONTINUE = 2,
SRA_PASSWORD = 3,
SRA_ACCEPT = 4,
SRA_REJECT = 5
};
#ifdef QTTELNET_DEBUG
QString authStr(int op)
{
QString str;
switch (op) {
case REPLY:
str = "REPLY";
break;
case NAME:
str = "NAME";
break;
default:
str = QString("Unknown auth (%1)").arg(op);
}
return str;
}
QString typeStr(int op)
{
QString str;
switch (op) {
case AUTHNULL:
str = "NULL";
break;
case KERBEROS_V4:
str = "KERBEROS_V4";
break;
case KERBEROS_V5:
str = "KERBEROS_V5";
break;
case SPX:
str = "SPX";
break;
case SRA:
str = "SRA";
break;
case LOKI:
str = "LOKI";
break;
default:
str = QString("Unknown auth type (%1)").arg(op);
}
return str;
}
QString whoStr(int op)
{
QString str;
op = op & AUTH_WHO_MASK;
switch (op) {
case AUTH_CLIENT_TO_SERVER:
str = "CLIENT";
break;
case AUTH_SERVER_TO_CLIENT:
str = "SERVER";
break;
default:
str = QString("Unknown who type (%1)").arg(op);
}
return str;
}
QString howStr(int op)
{
QString str;
op = op & AUTH_HOW_MASK;
switch (op) {
case AUTH_HOW_ONE_WAY:
str = "ONE-WAY";
break;
case AUTH_HOW_MUTUAL:
str = "MUTUAL";
break;
default:
str = QString("Unknown how type (%1)").arg(op);
}
return str;
}
QString sraStr(int op)
{
QString str;
switch (op) {
case SRA_KEY:
str = "KEY";
break;
case SRA_REJECT:
str = "REJECT";
break;
case SRA_ACCEPT:
str = "ACCEPT";
break;
case SRA_USER:
str = "USER";
break;
case SRA_CONTINUE:
str = "CONTINUE";
break;
case SRA_PASSWORD:
str = "PASSWORD";
break;
default:
str = QString("Unknown SRA option (%1)").arg(op);
}
return str;
}
#endif
};
namespace LineMode // RFC1184
{
const char Mode = 1;
const char ForwardMask = 2;
const char SLC = 3;
enum Modes
{
EDIT = 1,
TRAPSIG = 2,
MODE_ACK = 4,
SOFT_TAB = 8,
LIT_ECHO = 16
};
enum SLCs
{
SLC_SYNCH = 1,
SLC_BRK = 2,
SLC_IP = 3,
SLC_AO = 4,
SLC_AYT = 5,
SLC_EOR = 6,
SLC_ABORT = 7,
SLC_EOF = 8,
SLC_SUSP = 9,
SLC_EC = 10,
SLC_EL = 11,
SLC_EW = 12,
SLC_RP = 13,
SLC_LNEXT = 14,
SLC_XON = 15,
SLC_XOFF = 16,
SLC_FORW1 = 17,
SLC_FORW2 = 18,
SLC_MCL = 19,
SLC_MCR = 20,
SLC_MCWL = 21,
SLC_MCWR = 22,
SLC_MCBOL = 23,
SLC_MCEOL = 24,
SLC_INSRT = 25,
SLC_OVER = 26,
SLC_ECR = 27,
SLC_EWR = 28,
SLC_EBOL = 29,
SLC_EEOL = 30,
SLC_DEFAULT = 3,
SLC_VALUE = 2,
SLC_CANTCHANGE = 1,
SLC_NOSUPPORT = 0,
SLC_LEVELBITS = 3,
SLC_ACK = 128,
SLC_FLUSHIN = 64,
SLC_FLUSHOUT = 32
};
};
class QtTelnetAuthNull : public QtTelnetAuth
{
public:
QtTelnetAuthNull() : QtTelnetAuth(0) {}
QByteArray authStep(const QByteArray &data);
};
QByteArray QtTelnetAuthNull::authStep(const QByteArray &data)
{
Q_ASSERT(data[0] == Common::Authentication);
if (data.size() < 2 || data[1] != Common::SEND)
return QByteArray();
char buf[8] = {Common::IAC, Common::SB, Common::Authentication,
Common::IS, Auth::AUTHNULL, 0, // CLIENT|ONE-WAY
Common::IAC, Common::SE};
setState(AuthSuccess);
return QByteArray(buf, sizeof(buf));
}
class QtTelnetPrivate : public QObject
{
Q_OBJECT
public:
QtTelnetPrivate(QtTelnet *parent);
~QtTelnetPrivate();
QMap<char, bool> modes;
QList< QPair<uchar, uchar> > osent;
QtTelnet *q;
QTcpSocket *socket;
QtTelnetReceiveBuffer buffer;
QSocketNotifier *notifier;
QSize windowSize;
bool connected, nocheckp;
bool triedlogin, triedpass, firsttry;
QMap<int, QtTelnetAuth*> auths;
QtTelnetAuth *curauth;
bool nullauth;
QRegExp loginp, passp, promptp;
QString login, pass;
bool allowOption(int oper, int opt);
void sendOptions();
void sendCommand(const QByteArray &command);
void sendCommand(const char *command, int length);
void sendCommand(const char operation, const char option);
void sendString(const QString &str);
bool replyNeeded(uchar operation, uchar option);
void setMode(uchar operation, uchar option);
bool alreadySent(uchar operation, uchar option);
void addSent(uchar operation, uchar option);
void sendWindowSize();
int parsePlaintext(const QByteArray &data);
int parseIAC(const QByteArray &data);
bool isOperation(const uchar c);
bool isCommand(const uchar c);
QByteArray getSubOption(const QByteArray &data);
void parseSubAuth(const QByteArray &data);
void parseSubTT(const QByteArray &data);
void parseSubNAWS(const QByteArray &data);
uchar opposite(uchar operation, bool positive);
void consume();
void setSocket(QTcpSocket *socket);
public slots:
void socketConnected();
void socketConnectionClosed();
void socketReadyRead();
void socketError(QAbstractSocket::SocketError error);
void socketException(int);
};
QtTelnetPrivate::QtTelnetPrivate(QtTelnet *parent)
: q(parent), socket(0), notifier(0),
connected(false), nocheckp(false),
triedlogin(false), triedpass(false), firsttry(true),
curauth(0), nullauth(false),
loginp("ogin:\\s*$"), passp("assword:\\s*$")
{
setSocket(new QTcpSocket(this));
}
QtTelnetPrivate::~QtTelnetPrivate()
{
delete socket;
delete notifier;
delete curauth;
}
void QtTelnetPrivate::setSocket(QTcpSocket *s)
{
if (socket) {
q->logout();
socket->flush();
}
delete socket;
socket = s;
connected = false;
if (socket) {
connect(socket, SIGNAL(connected()), this, SLOT(socketConnected()));
connect(socket, SIGNAL(disconnected()),
this, SLOT(socketConnectionClosed()));
connect(socket, SIGNAL(readyRead()), this, SLOT(socketReadyRead()));
connect(socket, SIGNAL(error(QAbstractSocket::SocketError)),
this, SLOT(socketError(QAbstractSocket::SocketError)));
}
}
/*
Returns the opposite value of the one we pass in.
*/
uchar QtTelnetPrivate::opposite(uchar operation, bool positive)
{
if (operation == Common::DO)
return (positive ? Common::WILL : Common::WONT);
else if (operation == Common::DONT) // Not allowed to say WILL
return Common::WONT;
else if (operation == Common::WILL)
return (positive ? Common::DO : Common::DONT);
else if (operation == Common::WONT) // Not allowed to say DO
return Common::DONT;
return 0;
}
void QtTelnetPrivate::consume()
{
const QByteArray data = buffer.readAll();
int currpos = 0;
int prevpos = -1;;
while (prevpos < currpos && currpos < data.size()) {
prevpos = currpos;
const uchar c = uchar(data[currpos]);
if (c == Common::DM)
++currpos;
else if (c == Common::IAC)
currpos += parseIAC(data.mid(currpos));
else // Assume plain text
currpos += parsePlaintext(data.mid(currpos));
}
if (currpos < data.size())
buffer.push_back(data.mid(currpos));
}
bool QtTelnetPrivate::isCommand(const uchar c)
{
return (c == Common::DM);
}
bool QtTelnetPrivate::isOperation(const uchar c)
{
return (c == Common::WILL || c == Common::WONT
|| c == Common::DO ||c == Common::DONT);
}
QByteArray QtTelnetPrivate::getSubOption(const QByteArray &data)
{
Q_ASSERT(!data.isEmpty() && uchar(data[0]) == Common::IAC);
if (data.size() < 4 || uchar(data[1]) != Common::SB)
return QByteArray();
for (int i = 2; i < data.size() - 1; ++i) {
if (uchar(data[i]) == Common::IAC && uchar(data[i+1]) == Common::SE) {
return data.mid(2, i-2);
}
}
return QByteArray();
}
void QtTelnetPrivate::parseSubNAWS(const QByteArray &data)
{
Q_UNUSED(data);
}
void QtTelnetPrivate::parseSubTT(const QByteArray &data)
{
Q_ASSERT(!data.isEmpty() && data[0] == Common::TerminalType);
if (data.size() < 2 || data[1] != Common::SEND)
return;
const char c1[4] = { Common::IAC, Common::SB,
Common::TerminalType, Common::IS};
sendCommand(c1, sizeof(c1));
sendString("UNKNOWN");
const char c2[2] = { Common::IAC, Common::SE };
sendCommand(c2, sizeof(c2));
}
void QtTelnetPrivate::parseSubAuth(const QByteArray &data)
{
Q_ASSERT(data[0] == Common::Authentication);
if (!curauth && data[1] == Common::SEND) {
int pos = 2;
while (pos < data.size() && !curauth) {
curauth = auths[data[pos]];
pos += 2;
if (curauth) {
emit q->loginRequired();
break;
}
}
if (!curauth) {
curauth = new QtTelnetAuthNull;
nullauth = true;
if (loginp.isEmpty() && passp.isEmpty()) {
// emit q->loginRequired();
nocheckp = true;
}
}
}
if (curauth) {
const QByteArray a = curauth->authStep(data);
if (!a.isEmpty())
sendCommand(a);
if (curauth->state() == QtTelnetAuth::AuthFailure)
emit q->loginFailed();
else if (curauth->state() == QtTelnetAuth::AuthSuccess) {
if (loginp.isEmpty() && passp.isEmpty())
emit q->loggedIn();
if (!nullauth)
nocheckp = true;
}
}
}
/*
returns number of bytes consumed
*/
int QtTelnetPrivate::parseIAC(const QByteArray &data)
{
if (data.isEmpty())
return 0;
Q_ASSERT(uchar(data.at(0)) == Common::IAC);
if (data.size() >= 3 && isOperation(data[1])) { // IAC, Operation, Option
const uchar operation = data[1];
const uchar option = data[2];
if (operation == Common::WONT && option == Common::Logout) {
q->close();
return 3;
}
if (operation == Common::DONT && option == Common::Authentication) {
if (loginp.isEmpty() && passp.isEmpty())
emit q->loggedIn();
nullauth = true;
}
if (replyNeeded(operation, option)) {
bool allowed = allowOption(operation, option);
sendCommand(opposite(operation, allowed), option);
setMode(operation, option);
}
return 3;
}
if (data.size() >= 2 && isCommand(data[1])) { // IAC Command
return 2;
}
QByteArray suboption = getSubOption(data);
if (suboption.isEmpty())
return 0;
// IAC SB Operation SubOption [...] IAC SE
switch (suboption[0]) {
case Common::Authentication:
parseSubAuth(suboption);
break;
case Common::TerminalType:
parseSubTT(suboption);
break;
case Common::NAWS:
parseSubNAWS(data);
break;
default:
qWarning("QtTelnetPrivate::parseIAC: unknown suboption %d",
quint8(suboption.at(0)));
break;
}
return suboption.size() + 4;
}
int QtTelnetPrivate::parsePlaintext(const QByteArray &data)
{
int consumed = 0;
int length = data.indexOf('\0');
if (length == -1) {
length = data.size();
consumed = length;
} else {
consumed = length + 1; // + 1 for removing '\0'
}
QString text = QString::fromLocal8Bit(data.constData(), length);
if (!nocheckp && nullauth) {
if (!promptp.isEmpty() && promptp.indexIn(text) != -1) {
emit q->loggedIn();
nocheckp = true;
}
}
if (!nocheckp && nullauth) {
if (!loginp.isEmpty() && loginp.indexIn(text) != -1) {
if (triedlogin || firsttry) {
emit q->message(text); // Display the login prompt
text.clear();
emit q->loginRequired(); // Get a (new) login
firsttry = false;
}
if (!triedlogin) {
q->sendData(login);
triedlogin = true;
}
}
if (!passp.isEmpty() && passp.indexIn(text) != -1) {
if (triedpass || firsttry) {
emit q->message(text); // Display the password prompt
text.clear();
emit q->loginRequired(); // Get a (new) pass
firsttry = false;
}
if (!triedpass) {
q->sendData(pass);
triedpass = true;
// We don't have to store the password anymore
pass.fill(' ');
pass.resize(0);
}
}
}
if (!text.isEmpty())
emit q->message(text);
return consumed;
}
bool QtTelnetPrivate::replyNeeded(uchar operation, uchar option)
{
if (operation == Common::DO || operation == Common::DONT) {
// RFC854 requires that we don't acknowledge
// requests to enter a mode we're already in
if (operation == Common::DO && modes[option])
return false;
if (operation == Common::DONT && !modes[option])
return false;
}
return true;
}
void QtTelnetPrivate::setMode(uchar operation, uchar option)
{
if (operation != Common::DO && operation != Common::DONT)
return;
modes[option] = (operation == Common::DO);
if (option == Common::NAWS && modes[Common::NAWS])
sendWindowSize();
}
void QtTelnetPrivate::sendWindowSize()
{
if (!modes[Common::NAWS])
return;
if (!q->isValidWindowSize())
return;
short h = htons(windowSize.height());
short w = htons(windowSize.width());
const char c[9] = { Common::IAC, Common::SB, Common::NAWS,
(w & 0x00ff), (w >> 8), (h & 0x00ff), (h >> 8),
Common::IAC, Common::SE };
sendCommand(c, sizeof(c));
}
void QtTelnetPrivate::addSent(uchar operation, uchar option)
{
osent.append(QPair<uchar, uchar>(operation, option));
}
bool QtTelnetPrivate::alreadySent(uchar operation, uchar option)
{
QPair<uchar, uchar> value(operation, option);
if (osent.contains(value)) {
osent.removeAll(value);
return true;
}
return false;
}
void QtTelnetPrivate::sendString(const QString &str)
{
if (!connected || str.length() == 0)
return;
socket->write(str.toLocal8Bit());
}
void QtTelnetPrivate::sendCommand(const QByteArray &command)
{
if (!connected || command.isEmpty())
return;
if (command.size() == 3) {
const char operation = command.at(1);
const char option = command.at(2);
if (alreadySent(operation, option))
return;
addSent(operation, option);
}
socket->write(command);
}
void QtTelnetPrivate::sendCommand(const char operation, const char option)
{
const char c[3] = { Common::IAC, operation, option };
sendCommand(c, 3);
}
void QtTelnetPrivate::sendCommand(const char *command, int length)
{
QByteArray a(command, length);
sendCommand(a);
}
bool QtTelnetPrivate::allowOption(int /*oper*/, int opt)
{
if (opt == Common::Authentication ||
opt == Common::SuppressGoAhead ||
opt == Common::LineMode ||
opt == Common::Status ||
opt == Common::Logout ||
opt == Common::TerminalType)
return true;
if (opt == Common::NAWS && q->isValidWindowSize())
return true;
return false;
}
void QtTelnetPrivate::sendOptions()
{
sendCommand(Common::WILL, Common::Authentication);
sendCommand(Common::DO, Common::SuppressGoAhead);
sendCommand(Common::WILL, Common::LineMode);
sendCommand(Common::DO, Common::Status);
if (q->isValidWindowSize())
sendCommand(Common::WILL, Common::NAWS);
}
void QtTelnetPrivate::socketConnected()
{
connected = true;
delete notifier;
notifier = new QSocketNotifier(socket->socketDescriptor(),
QSocketNotifier::Exception, this);
connect(notifier, SIGNAL(activated(int)),
this, SLOT(socketException(int)));
sendOptions();
}
void QtTelnetPrivate::socketException(int)
{
// qDebug("out-of-band data received, should handle that here!");
}
void QtTelnetPrivate::socketConnectionClosed()
{
delete notifier;
notifier = 0;
connected = false;
emit q->loggedOut();
}
void QtTelnetPrivate::socketReadyRead()
{
buffer.append(socket->readAll());
consume();
}
void QtTelnetPrivate::socketError(QAbstractSocket::SocketError error)
{
emit q->connectionError(error);
}
/*!
\enum QtTelnet::Control
This enum specifies control messages you can send to the Telnet server
using sendControl().
\value GoAhead Sends the \c GO \c AHEAD control message, meaning that the
server can continue to send data.
\value InterruptProcess Interrupts the current running process on
the server. This is the equivalent of pressing \key{Ctrl+C} in most
terminal emulators.
\value AreYouThere Sends the \c ARE \c YOU \c THERE control
message, to check if the connection is still alive.
\value AbortOutput Temporarily suspends the output from the server.
The output will resume if you send this control message again.
\value EraseCharacter Erases the last entered character.
\value EraseLine Erases the last line.
\value Break Sends the \c BREAK control message.
\value EndOfFile Sends the \c END \c OF \c FILE control message.
\value Suspend Suspends the current running process on the server.
Equivalent to pressing \key{Ctrl+Z} in most terminal emulators.
\value Abort Sends the \c ABORT control message.