public void Run()
{
Buffer buf = new Buffer(300); // ??
Packet packet = new Packet(buf);
thread = this;
try
{
while (thread != null)
{
Socket socket = ss.Accept();
socket.setTcpNoDelay(true);
Stream In = socket.getInputStream();
Stream Out = socket.getOutputStream();
ChannelDirectTCPIP channel = new ChannelDirectTCPIP();
channel.Init();
channel.setInputStream(In);
channel.setOutputStream(Out);
session.addChannel(channel);
((ChannelDirectTCPIP)channel).Host = host;
((ChannelDirectTCPIP)channel).Port = rport;
((ChannelDirectTCPIP)channel).OrgIPAddress = socket.getInetAddress().getHostAddress();
((ChannelDirectTCPIP)channel).OrgPort = socket.Port;
channel.connect();
if (channel.ExitStatus != -1)
{
}
}
}
catch { }
delete();
}
public override void Run()
{
m_thread = Thread.currentThread();
Buffer buf = new Buffer(m_rmpsize);
Packet packet = new Packet(buf);
int i = 0;
try
{
while (m_thread != null && m_io != null && m_io.m_ins != null)
{
i = m_io.m_ins.Read(buf.m_buffer,
14,
buf.m_buffer.Length - 14
- 32 - 20 // padding and mac
);
if (i <= 0)
{
eof();
break;
}
packet.reset();
if (m_close)
break;
buf.putByte((byte)Session.SSH_MSG_CHANNEL_DATA);
buf.putInt(m_recipient);
buf.putInt(i);
buf.skip(i);
m_session.write(packet, this, i);
}
}
catch (Exception)
{ }
disconnect();
}
public void request(Session session, Channel channel)
{
Buffer buf = new Buffer();
Packet packet = new Packet(buf);
bool reply = waitForReply();
if (reply)
channel.Replay = -1;
packet.reset();
buf.putByte((byte)Session.SSH_MSG_CHANNEL_REQUEST);
buf.putInt(channel.Recipient);
buf.putString("subsystem");
buf.putByte((byte)(waitForReply() ? 1 : 0));
buf.putString(m_subsystem);
session.write(packet);
if (reply)
{
while (channel.Replay == -1)
{
try { Thread.sleep(10); }
catch { }
}
if (channel.Replay == 0)
throw new JSchException("failed to send subsystem request");
}
}
public void request(Session session, Channel channel)
{
Buffer buf = new Buffer();
Packet packet = new Packet(buf);
bool reply = waitForReply();
if (reply)
{
channel.Replay = -1;
}
packet.reset();
buf.putByte((byte)Session.SSH_MSG_CHANNEL_REQUEST);
buf.putInt(channel.Recipient);
buf.putString(Util.getBytes("subsystem"));
buf.putByte((byte)(waitForReply() ? 1 : 0));
buf.putString(Util.getBytes("sftp"));
session.write(packet);
if (reply)
{
while (channel.Replay == -1)
{
try { System.Threading.Thread.Sleep(10); }
catch//(Exception ee)
{
}
}
if (channel.Replay == 0)
{
throw new JSchException("failed to send sftp request");
}
}
}
public override void connect()
{
try
{
if (!m_session.IsConnected())
throw new JSchException("session is down");
Buffer buf = new Buffer(150);
Packet packet = new Packet(buf);
packet.reset();
buf.putByte((byte)90);
buf.putString(Util.getBytes("direct-tcpip"));
buf.putInt(m_id);
buf.putInt(m_lwsize);
buf.putInt(m_lmpsize);
buf.putString(Util.getBytes(m_host));
buf.putInt(m_port);
buf.putString(Util.getBytes(m_originator_IP_address));
buf.putInt(m_originator_port);
m_session.write(packet);
int retry = 1000;
try
{
while (Recipient == -1
&& m_session.IsConnected()
&& retry > 0
&& !m_eof_remote
)
{
Thread.Sleep(50);
retry--;
}
}
catch { }
if (!m_session.IsConnected())
throw new JSchException("session is down");
if (retry == 0 || this.m_eof_remote)
throw new JSchException("channel is not opened.");
m_connected = true;
m_thread = new Thread(this);
m_thread.Start();
}
catch (Exception e)
{
m_io.close();
m_io = null;
Channel.Remove(this);
if (e is JSchException)
throw (JSchException)e;
}
}
public void request(Session session, Channel channel)
{
Buffer buf = new Buffer();
Packet packet = new Packet(buf);
packet.reset();
buf.putByte((byte)Session.SSH_MSG_CHANNEL_REQUEST);
buf.putInt(channel.Recipient);
buf.putString(Util.getBytes("signal"));
buf.putByte((byte)(waitForReply() ? 1 : 0));
buf.putString(Util.getBytes(m_signal));
session.write(packet);
}
public override void init(Session session, byte[] V_S, byte[] V_C, byte[] I_S, byte[] I_C)
{
m_session = session;
m_V_S = V_S;
m_V_C = V_C;
m_I_S = I_S;
m_I_C = I_C;
try
{
Type t = Type.GetType(session.getConfig("sha-1"));
m_sha = (HASH)(Activator.CreateInstance(t));
m_sha.init();
}
catch (Exception ex)
{
throw ex;
}
m_buf = new Buffer();
m_packet = new Packet(m_buf);
try
{
Type t = Type.GetType(session.getConfig("dh"));
m_dh = (DH)(Activator.CreateInstance(t));
m_dh.init();
}
catch (Exception ee)
{
throw ee;
}
m_dh.P = m_p;
m_dh.G = m_g;
// The client responds with:
// byte SSH_MSG_KEXDH_INIT(30)
// mpint e <- g^x mod p
// x is a random number (1 < x < (p-1)/2)
m_e = m_dh.E;
m_packet.reset();
m_buf.putByte((byte)SSH_MSG_KEXDH_INIT);
m_buf.putMPInt(m_e);
session.write(m_packet);
m_state = SSH_MSG_KEXDH_REPLY;
}
public void request(Session session, Channel channel)
{
Buffer buf = new Buffer();
Packet packet = new Packet(buf);
// send
// byte SSH_MSG_CHANNEL_REQUEST(98)
// uint32 recipient channel
// string request type // "shell"
// boolean want reply // 0
packet.reset();
buf.putByte((byte)Session.SSH_MSG_CHANNEL_REQUEST);
buf.putInt(channel.Recipient);
buf.putString(Util.getBytes("shell"));
buf.putByte((byte)(waitForReply() ? 1 : 0));
session.write(packet);
}
public override void init(Session session, byte[] V_S, byte[] V_C, byte[] I_S, byte[] I_C)
{
m_session = session;
m_V_S = V_S;
m_V_C = V_C;
m_I_S = I_S;
m_I_C = I_C;
try
{
Type t = Type.GetType(session.getConfig("sha-1"));
m_sha = (HASH)(Activator.CreateInstance(t));
m_sha.init();
}
catch (Exception) { }
m_buf = new Buffer();
m_packet = new Packet(m_buf);
try
{
Type t = Type.GetType(session.getConfig("dh"));
m_dh = (DH)(Activator.CreateInstance(t));
m_dh.init();
}
catch (Exception e)
{
throw e;
}
m_packet.reset();
m_buf.putByte((byte)0x22);
m_buf.putInt(m_min);
m_buf.putInt(m_preferred);
m_buf.putInt(m_max);
session.write(m_packet);
m_state = SSH_MSG_KEX_DH_GEX_GROUP;
}
public void request(Session session, Channel channel)
{
Buffer buf = new Buffer();
Packet packet = new Packet(buf);
//byte SSH_MSG_CHANNEL_REQUEST
//uint32 recipient_channel
//string "window-change"
//boolean FALSE
//uint32 terminal width, columns
//uint32 terminal height, rows
//uint32 terminal width, pixels
//uint32 terminal height, pixels
packet.reset();
buf.putByte((byte)Session.SSH_MSG_CHANNEL_REQUEST);
buf.putInt(channel.Recipient);
buf.putString(Util.getBytes("window-change"));
buf.putByte((byte)(waitForReply() ? 1 : 0));
buf.putInt(m_width_columns);
buf.putInt(m_height_rows);
buf.putInt(m_width_pixels);
buf.putInt(m_height_pixels);
session.write(packet);
}
public void Run()
{
m_thread = this;
byte[] foo;
Buffer buf = new Buffer();
Packet packet = new Packet(buf);
int i = 0;
Channel channel;
int[] start = new int[1];
int[] length = new int[1];
KeyExchange kex = null;
try
{
while (m_isConnected &&
m_thread != null)
{
buf = read(buf);
int msgType = buf.m_buffer[5] & 0xff;
if (kex != null && kex.getState() == msgType)
{
bool result = kex.next(buf);
if (!result)
throw new JSchException("verify: " + result);
continue;
}
switch (msgType)
{
case SSH_MSG_KEXINIT:
kex = receive_kexinit(buf);
break;
case SSH_MSG_NEWKEYS:
send_newkeys();
receive_newkeys(buf, kex);
kex = null;
break;
case SSH_MSG_CHANNEL_DATA:
buf.getInt();
buf.getByte();
buf.getByte();
i = buf.getInt();
channel = Channel.FindChannel(i, this);
foo = buf.getString(start, length);
if (channel == null)
break;
try
{
channel.write(foo, start[0], length[0]);
}
catch (Exception)
{
try
{
channel.disconnect();
}
catch (Exception)
{ }
break;
}
int len = length[0];
channel.LocalWindowSize = channel.LocalWindowSize - len;
if (channel.LocalWindowSize < channel.LocalWindowSizeMax / 2)
{
packet.reset();
buf.putByte((byte)SSH_MSG_CHANNEL_WINDOW_ADJUST);
buf.putInt(channel.Recipient);
buf.putInt(channel.LocalWindowSizeMax - channel.LocalWindowSize);
write(packet);
channel.LocalWindowSize = channel.LocalWindowSizeMax;
}
break;
case SSH_MSG_CHANNEL_EXTENDED_DATA:
buf.getInt();
buf.getShort();
i = buf.getInt();
channel = Channel.FindChannel(i, this);
buf.getInt(); // data_type_code == 1
foo = buf.getString(start, length);
if (channel == null)
break;
channel.write_ext(foo, start[0], length[0]);
len = length[0];
channel.LocalWindowSize = channel.LocalWindowSize - len;
if (channel.LocalWindowSize < channel.LocalWindowSizeMax / 2)
{
packet.reset();
buf.putByte((byte)SSH_MSG_CHANNEL_WINDOW_ADJUST);
buf.putInt(channel.Recipient);
buf.putInt(channel.LocalWindowSizeMax - channel.LocalWindowSize);
write(packet);
channel.LocalWindowSize = channel.LocalWindowSizeMax;
}
break;
case SSH_MSG_CHANNEL_WINDOW_ADJUST:
buf.getInt();
buf.getShort();
i = buf.getInt();
channel = Channel.FindChannel(i, this);
if (channel == null)
break;
channel.addRemoteWindowSize(buf.getInt());
break;
case SSH_MSG_CHANNEL_EOF:
buf.getInt();
buf.getShort();
i = buf.getInt();
channel = Channel.FindChannel(i, this);
if (channel != null)
channel.eof_remote();
break;
case SSH_MSG_CHANNEL_CLOSE:
buf.getInt();
buf.getShort();
i = buf.getInt();
channel = Channel.FindChannel(i, this);
if (channel != null)
channel.disconnect();
break;
case SSH_MSG_CHANNEL_OPEN_CONFIRMATION:
buf.getInt();
buf.getShort();
i = buf.getInt();
channel = Channel.FindChannel(i, this);
channel.Recipient = buf.getInt();
channel.RemoteWindowSize = buf.getInt();
channel.RemotePacketSize = buf.getInt();
break;
case SSH_MSG_CHANNEL_OPEN_FAILURE:
buf.getInt();
buf.getShort();
i = buf.getInt();
channel = Channel.FindChannel(i, this);
int reason_code = buf.getInt();
channel.ExitStatus = reason_code;
channel.IsClosed = true;
channel.IsEofRemote = true;
channel.Recipient = 0;
break;
case SSH_MSG_CHANNEL_REQUEST:
buf.getInt();
buf.getShort();
i = buf.getInt();
foo = buf.getString();
bool reply = (buf.getByte() != 0);
channel = Channel.FindChannel(i, this);
if (channel != null)
{
byte reply_type = (byte)SSH_MSG_CHANNEL_FAILURE;
if (Util.getStringUTF8(foo) == "exit-status")
{
i = buf.getInt(); // exit-status
channel.ExitStatus = i;
reply_type = (byte)SSH_MSG_CHANNEL_SUCCESS;
}
if (reply)
{
packet.reset();
buf.putByte(reply_type);
buf.putInt(channel.Recipient);
write(packet);
}
}
break;
case SSH_MSG_CHANNEL_OPEN:
buf.getInt();
buf.getShort();
string ctyp = Util.getStringUTF8(buf.getString());
if ("forwarded-tcpip" != ctyp && !("x11" == ctyp && m_x11_forwarding))
{
Console.WriteLine("Session.run: CHANNEL OPEN " + ctyp);
throw new IOException("Session.run: CHANNEL OPEN " + ctyp);
}
else
{
channel = Channel.getChannel(ctyp);
addChannel(channel);
channel.getData(buf);
channel.Init();
packet.reset();
buf.putByte((byte)SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
buf.putInt(channel.Recipient);
buf.putInt(channel.Id);
buf.putInt(channel.LocalWindowSize);
buf.putInt(channel.LocalPacketSize);
write(packet);
Thread tmp = new Thread(channel);
tmp.Name = "Channel " + ctyp + " " + m_host;
tmp.Start();
break;
}
case SSH_MSG_CHANNEL_SUCCESS:
buf.getInt();
buf.getShort();
i = buf.getInt();
channel = Channel.FindChannel(i, this);
if (channel == null)
break;
channel.Replay = 1;
break;
case SSH_MSG_CHANNEL_FAILURE:
buf.getInt();
buf.getShort();
i = buf.getInt();
channel = Channel.FindChannel(i, this);
if (channel == null)
break;
channel.Replay = 0;
break;
case SSH_MSG_GLOBAL_REQUEST:
buf.getInt();
buf.getShort();
foo = buf.getString(); // request name
reply = (buf.getByte() != 0);
if (reply)
{
packet.reset();
buf.putByte((byte)SSH_MSG_REQUEST_FAILURE);
write(packet);
}
break;
case SSH_MSG_REQUEST_FAILURE:
case SSH_MSG_REQUEST_SUCCESS:
Thread t = m_grr.getThread();
if (t != null)
{
m_grr.setReply(msgType == SSH_MSG_REQUEST_SUCCESS ? 1 : 0);
t.Interrupt();
}
break;
default:
throw new IOException("Unknown SSH message type " + msgType);
}
}
}
catch (Exception)
{ }
try
{
disconnect();
}
catch (NullReferenceException)
{ }
catch (Exception)
{ }
m_isConnected = false;
}
// encode will bin invoked in write with synchronization.
public void encode(Packet packet)
{
if (m_deflater != null)
packet.m_buffer.m_index = m_deflater.compress(packet.m_buffer.m_buffer, 5, packet.m_buffer.m_index);
if (m_c2scipher != null)
{
packet.padding(m_c2scipher.IVSize);
int pad = packet.m_buffer.m_buffer[4];
lock (m_random)
{
m_random.fill(packet.m_buffer.m_buffer, packet.m_buffer.m_index - pad, pad);
}
}
else
packet.padding(8);
byte[] mac = null;
if (m_c2smac != null)
{
m_c2smac.update(m_seq_o);
m_c2smac.update(packet.m_buffer.m_buffer, 0, packet.m_buffer.m_index);
mac = m_c2smac.doFinal();
}
if (m_c2scipher != null)
{
byte[] buf = packet.m_buffer.m_buffer;
m_c2scipher.update(buf, 0, packet.m_buffer.m_index, buf, 0);
}
if (mac != null)
packet.m_buffer.putByte(mac);
}
private void _write(Packet packet)
{
encode(packet);
if (m_io != null)
{
m_io.put(packet);
m_seq_o++;
}
}
private void setPortForwarding(int rport)
{
lock (m_grr)
{
Buffer buf = new Buffer(100); // ??
Packet packet = new Packet(buf);
try
{
packet.reset();
buf.putByte((byte)SSH_MSG_GLOBAL_REQUEST);
buf.putString("tcpip-forward");
buf.putByte((byte)1);
buf.putString("0.0.0.0");
buf.putInt(rport);
write(packet);
}
catch (Exception e)
{
throw new JSchException(e.ToString());
}
m_grr.setThread(Thread.currentThread());
try
{
Thread.Sleep(10000);
}
catch { }
int reply = m_grr.getReply();
m_grr.setThread(null);
if (reply == 0)
throw new JSchException("remote port forwarding failed for listen port " + rport);
}
}
public void write(Packet packet)
{
while (m_in_kex)
{
byte command = packet.m_buffer.m_buffer[5];
if (false
|| command == SSH_MSG_KEXINIT
|| command == SSH_MSG_NEWKEYS
|| command == SSH_MSG_KEXDH_INIT
|| command == SSH_MSG_KEXDH_REPLY
|| command == SSH_MSG_DISCONNECT
|| command == SSH_MSG_KEX_DH_GEX_GROUP
|| command == SSH_MSG_KEX_DH_GEX_INIT
|| command == SSH_MSG_KEX_DH_GEX_REPLY
|| command == SSH_MSG_KEX_DH_GEX_REQUEST
)
break;
try
{
Thread.Sleep(10);
}
catch (ThreadInterruptedException)
{ }
}
_write(packet);
}
internal Session(JSch jsch)
{
m_jsch = jsch;
m_buf = new Buffer();
m_packet = new Packet(m_buf);
}
public virtual void connect()
{
if (!m_session.IsConnected())
throw new JSchException("session is down");
try
{
Buffer buf = new Buffer(100);
Packet packet = new Packet(buf);
packet.reset();
buf.putByte((byte)90);
buf.putString(m_type);
buf.putInt(m_id);
buf.putInt(m_lwsize);
buf.putInt(m_lmpsize);
m_session.write(packet);
int retry = 1000;
while (Recipient == -1
&& m_session.IsConnected()
&& retry > 0
)
{
try
{
Thread.sleep(50);
}
catch (Exception) { }
retry--;
}
if (!m_session.IsConnected())
throw new JSchException("session is down");
if (retry == 0)
throw new JSchException("channel is not opened.");
m_connected = true;
start();
}
catch (Exception e)
{
m_connected = false;
if (e is JSchException)
throw (JSchException)e;
}
}
public void sendIgnore()
{
Buffer buf = new Buffer();
Packet packet = new Packet(buf);
packet.reset();
buf.putByte((byte)SSH_MSG_IGNORE);
write(packet);
}
public override void start()
{
try
{
PipedOutputStream pos = new PipedOutputStream();
m_io.setOutputStream(pos);
PipedInputStream pis = new ChannelPipedInputStream(pos, 32 * 1024);
m_io.setInputStream(pis);
Request request = new RequestSftp();
request.request(m_session, this);
m_buffer = new Buffer(m_rmpsize);
m_packet = new Packet(m_buffer);
int i = 0;
int length;
int type;
byte[] str;
// send SSH_FXP_INIT
sendINIT();
// receive SSH_FXP_VERSION
Header header = new Header();
header = fillHeader(m_buffer, header);
length = header.Length;
if (length > MAX_MSG_LENGTH)
throw new SftpException(ChannelSftpResult.SSH_FX_FAILURE, "Received message is too long: " + length);
type = header.HeaderType; // 2 -> SSH_FXP_VERSION
m_server_version = header.RID;
skip(length);
// send SSH_FXP_REALPATH
sendREALPATH(Util.getBytesUTF8("."));
// receive SSH_FXP_NAME
header = fillHeader(m_buffer, header);
length = header.Length;
type = header.HeaderType; // 104 -> SSH_FXP_NAME
m_buffer.rewind();
fill(m_buffer.m_buffer, 0, length);
i = m_buffer.getInt(); // count
str = m_buffer.getString(); // filename
m_home = m_cwd = Util.getStringUTF8(str);
str = m_buffer.getString(); // logname
// SftpATTRS.getATTR(buf); // attrs
m_lcwd = new File(".").CanonicalPath;
}
catch (Exception e)
{
if (e is JSchException)
throw (JSchException)e;
throw new JSchException(e.ToString());
}
}
internal static void delPort(Session session, int rport)
{
lock (m_pool)
{
Object[] foo = null;
for (int i = 0; i < m_pool.Count; i++)
{
Object[] bar = (Object[])(m_pool[i]);
if (bar[0] != session)
continue;
if ((int)bar[1] != rport)
continue;
foo = bar;
break;
}
if (foo == null)
return;
m_pool.Remove(foo);
}
Buffer buf = new Buffer(100);
Packet packet = new Packet(buf);
try
{
packet.reset();
buf.putByte((byte)80 /*SSH_MSG_GLOBAL_REQUEST*/);
buf.putString("cancel-tcpip-forward");
buf.putByte((byte)0);
buf.putString("0.0.0.0");
buf.putInt(rport);
session.write(packet);
}
catch (Exception)
{ }
}
/*
http://www1.ietf.org/internet-drafts/draft-ietf-secsh-connect-24.txt
5.3 Closing a Channel
When a party will no longer send more data to a channel, it SHOULD
send SSH_MSG_CHANNEL_EOF.
byte SSH_MSG_CHANNEL_EOF
uint32 recipient_channel
No explicit response is sent to this message. However, the
application may send EOF to whatever is at the other end of the
channel. Note that the channel remains open after this message, and
more data may still be sent In the other direction. This message
does not consume window space and can be sent even if no window space
is available.
When either party wishes to terminate the channel, it sends
SSH_MSG_CHANNEL_CLOSE. Upon receiving this message, a party MUST
send back a SSH_MSG_CHANNEL_CLOSE unless it has already sent this
message for the channel. The channel is considered closed for a
party when it has both sent and received SSH_MSG_CHANNEL_CLOSE, and
the party may then reuse the channel number. A party MAY send
SSH_MSG_CHANNEL_CLOSE without having sent or received
SSH_MSG_CHANNEL_EOF.
byte SSH_MSG_CHANNEL_CLOSE
uint32 recipient_channel
This message does not consume window space and can be sent even if no
window space is available.
It is recommended that any data sent before this message is delivered
to the actual destination, if possible.
*/
internal virtual void close()
{
if (m_close) return;
m_close = true;
try
{
Buffer buf = new Buffer(100);
Packet packet = new Packet(buf);
packet.reset();
buf.putByte((byte)Session.SSH_MSG_CHANNEL_CLOSE);
buf.putInt(Recipient);
m_session.write(packet);
}
catch (Exception)
{ }
}
internal virtual void eof()
{
// Thread.dumpStack();
if (m_close || m_eof_local)
return;
m_eof_local = true;
try
{
Buffer buf = new Buffer(100);
Packet packet = new Packet(buf);
packet.reset();
buf.putByte((byte)Session.SSH_MSG_CHANNEL_EOF);
buf.putInt(Recipient);
m_session.write(packet);
}
catch (Exception)
{ }
}
public void sendKeepAliveMsg()
{
Buffer buf = new Buffer();
Packet packet = new Packet(buf);
packet.reset();
buf.putByte((byte)SSH_MSG_GLOBAL_REQUEST);
buf.putString(m_keepalivemsg);
buf.putByte((byte)1);
write(packet);
}
public void put(Packet p)
{
m_outs.Write(p.m_buffer.m_buffer, 0, p.m_buffer.m_index);
m_outs.Flush();
}
public void write(Packet packet, Channel c, int length)
{
while (true)
{
if (m_in_kex)
{
try
{
Thread.Sleep(10);
}
catch (ThreadInterruptedException)
{ }
continue;
}
lock (c)
{
if (c.RemoteWindowSize >= length)
{
c.RemoteWindowSize -= length;
break;
}
}
if (c.IsClosed || !c.isConnected())
throw new IOException("channel is broken");
bool sendit = false;
int s = 0;
byte command = 0;
int recipient = -1;
lock (c)
{
if (c.RemoteWindowSize > 0)
{
int len = c.RemoteWindowSize;
if (len > length)
len = length;
if (len != length)
s = packet.shift(len, (m_c2smac != null ? m_c2smac.BlockSize : 0));
command = packet.m_buffer.m_buffer[5];
recipient = c.Recipient;
length -= len;
c.RemoteWindowSize -= len;
sendit = true;
}
}
if (sendit)
{
_write(packet);
if (length == 0)
return;
packet.unshift(command, recipient, s, length);
lock (c)
{
if (c.RemoteWindowSize >= length)
{
c.RemoteWindowSize -= length;
break;
}
}
}
try
{
Thread.Sleep(100);
}
catch (ThreadInterruptedException)
{ }
}
_write(packet);
}
/*
SSH_FX_OK
Indicates successful completion of the operation.
SSH_FX_EOF
indicates end-of-file condition; for SSH_FX_READ it means that no
more data is available in the file, and for SSH_FX_READDIR it
indicates that no more files are contained in the directory.
SSH_FX_NO_SUCH_FILE
is returned when a reference is made to a file which should exist
but doesn't.
SSH_FX_PERMISSION_DENIED
is returned when the authenticated user does not have sufficient
permissions to perform the operation.
SSH_FX_FAILURE
is a generic catch-all error message; it should be returned if an
error occurs for which there is no more specific error code
defined.
SSH_FX_BAD_MESSAGE
may be returned if a badly formatted packet or protocol
incompatibility is detected.
SSH_FX_NO_CONNECTION
is a pseudo-error which indicates that the client has no
connection to the server (it can only be generated locally by the
client, and MUST NOT be returned by servers).
SSH_FX_CONNECTION_LOST
is a pseudo-error which indicates that the connection to the
server has been lost (it can only be generated locally by the
client, and MUST NOT be returned by servers).
SSH_FX_OP_UNSUPPORTED
indicates that an attempt was made to perform an operation which
is not supported for the server (it may be generated locally by
the client if e.g. the version number exchange indicates that a
required feature is not supported by the server, or it may be
returned by the server if the server does not implement an
operation).
*/
/*
10. Changes from previous protocol versions
The SSH File Transfer Protocol has changed over time, before it's
standardization. The following is a description of the incompatible
changes between different versions.
10.1 Changes between versions 3 and 2
o The SSH_FXP_READLINK and SSH_FXP_SYMLINK messages were added.
o The SSH_FXP_EXTENDED and SSH_FXP_EXTENDED_REPLY messages were added.
o The SSH_FXP_STATUS message was changed to include fields `error
message' and `language tag'.
10.2 Changes between versions 2 and 1
o The SSH_FXP_RENAME message was added.
10.3 Changes between versions 1 and 0
o Implementation changes, no actual protocol changes.
*/
internal ChannelSftp()
{
m_packet = new Packet(m_buffer);
}