public void msgChannelOpenConfirmation(byte[] msg, int msglen) throws IOException {
PacketChannelOpenConfirmation sm = new PacketChannelOpenConfirmation(msg, 0, msglen);
Channel c = getChannel(sm.recipientChannelID);
if (c == null)
throw new IOException(
"Unexpected SSH_MSG_CHANNEL_OPEN_CONFIRMATION message for non-existent channel "
+ sm.recipientChannelID);
synchronized (c) {
if (c.state != Channel.STATE_OPENING)
throw new IOException(
"Unexpected SSH_MSG_CHANNEL_OPEN_CONFIRMATION message for channel "
+ sm.recipientChannelID);
c.remoteID = sm.senderChannelID;
c.remoteWindow = sm.initialWindowSize & 0xFFFFffffL; /* convert UINT32 to long */
c.remoteMaxPacketSize = sm.maxPacketSize;
c.state = Channel.STATE_OPEN;
c.notifyAll();
}
log.debug(
"Got SSH_MSG_CHANNEL_OPEN_CONFIRMATION (channel "
+ sm.recipientChannelID
+ " / remote: "
+ sm.senderChannelID
+ ")");
}
public void msgChannelWindowAdjust(byte[] msg, int msglen) throws IOException {
if (msglen != 9)
throw new IOException(
"SSH_MSG_CHANNEL_WINDOW_ADJUST message has wrong size (" + msglen + ")");
int id =
((msg[1] & 0xff) << 24)
| ((msg[2] & 0xff) << 16)
| ((msg[3] & 0xff) << 8)
| (msg[4] & 0xff);
int windowChange =
((msg[5] & 0xff) << 24)
| ((msg[6] & 0xff) << 16)
| ((msg[7] & 0xff) << 8)
| (msg[8] & 0xff);
Channel c = getChannel(id);
if (c == null)
throw new IOException(
"Unexpected SSH_MSG_CHANNEL_WINDOW_ADJUST message for non-existent channel " + id);
synchronized (c) {
final long huge = 0xFFFFffffL; /* 2^32 - 1 */
c.remoteWindow += (windowChange & huge); /* avoid sign extension */
/* TODO - is this a good heuristic? */
if ((c.remoteWindow > huge)) c.remoteWindow = huge;
c.notifyAll();
}
log.debug("Got SSH_MSG_CHANNEL_WINDOW_ADJUST (channel " + id + ", " + windowChange + ")");
}
public void sendData(Channel c, byte[] buffer, int pos, int len) throws IOException {
boolean wasInterrupted = false;
try {
while (len > 0) {
int thislen = 0;
byte[] msg;
synchronized (c) {
while (true) {
if (c.state == Channel.STATE_CLOSED)
throw new ChannelClosedException(
"SSH channel is closed. (" + c.getReasonClosed() + ")");
if (c.state != Channel.STATE_OPEN)
throw new ChannelClosedException("SSH channel in strange state. (" + c.state + ")");
if (c.remoteWindow != 0) break;
try {
c.wait();
} catch (InterruptedException ignore) {
wasInterrupted = true;
}
}
/* len > 0, no sign extension can happen when comparing */
thislen = (c.remoteWindow >= len) ? len : (int) c.remoteWindow;
int estimatedMaxDataLen = c.remoteMaxPacketSize - (tm.getPacketOverheadEstimate() + 9);
/* The worst case scenario =) a true bottleneck */
if (estimatedMaxDataLen <= 0) {
estimatedMaxDataLen = 1;
}
if (thislen > estimatedMaxDataLen) thislen = estimatedMaxDataLen;
c.remoteWindow -= thislen;
msg = new byte[1 + 8 + thislen];
msg[0] = Packets.SSH_MSG_CHANNEL_DATA;
msg[1] = (byte) (c.remoteID >> 24);
msg[2] = (byte) (c.remoteID >> 16);
msg[3] = (byte) (c.remoteID >> 8);
msg[4] = (byte) (c.remoteID);
msg[5] = (byte) (thislen >> 24);
msg[6] = (byte) (thislen >> 16);
msg[7] = (byte) (thislen >> 8);
msg[8] = (byte) (thislen);
System.arraycopy(buffer, pos, msg, 9, thislen);
}
synchronized (c.channelSendLock) {
if (c.closeMessageSent == true)
throw new ChannelClosedException(
"SSH channel is closed. (" + c.getReasonClosed() + ")");
tm.sendMessage(msg);
}
pos += thislen;
len -= thislen;
}
} finally {
if (wasInterrupted) Thread.currentThread().interrupt();
}
}
public void msgChannelOpen(byte[] msg, int msglen) throws IOException {
TypesReader tr = new TypesReader(msg, 0, msglen);
tr.readByte(); // skip packet type
String channelType = tr.readString();
int remoteID = tr.readUINT32(); /* sender channel */
int remoteWindow = tr.readUINT32(); /* initial window size */
int remoteMaxPacketSize = tr.readUINT32(); /* maximum packet size */
if ("x11".equals(channelType)) {
synchronized (x11_magic_cookies) {
/* If we did not request X11 forwarding, then simply ignore this bogus request. */
if (x11_magic_cookies.size() == 0) {
PacketChannelOpenFailure pcof =
new PacketChannelOpenFailure(
remoteID,
Packets.SSH_OPEN_ADMINISTRATIVELY_PROHIBITED,
"X11 forwarding not activated",
"");
tm.sendAsynchronousMessage(pcof.getPayload());
log.warning("Unexpected X11 request, denying it!");
return;
}
}
String remoteOriginatorAddress = tr.readString();
int remoteOriginatorPort = tr.readUINT32();
Channel c = new Channel(this);
synchronized (c) {
c.remoteID = remoteID;
c.remoteWindow = remoteWindow & 0xFFFFffffL; /* properly convert UINT32 to long */
c.remoteMaxPacketSize = remoteMaxPacketSize;
c.localID = addChannel(c);
}
/*
* The open confirmation message will be sent from another thread
*/
RemoteX11AcceptThread rxat =
new RemoteX11AcceptThread(c, remoteOriginatorAddress, remoteOriginatorPort);
rxat.setDaemon(true);
rxat.start();
return;
}
if ("forwarded-tcpip".equals(channelType)) {
String remoteConnectedAddress = tr.readString(); /* address that was connected */
int remoteConnectedPort = tr.readUINT32(); /* port that was connected */
String remoteOriginatorAddress = tr.readString(); /* originator IP address */
int remoteOriginatorPort = tr.readUINT32(); /* originator port */
RemoteForwardingData rfd = null;
synchronized (remoteForwardings) {
rfd = remoteForwardings.get(new Integer(remoteConnectedPort));
}
if (rfd == null) {
PacketChannelOpenFailure pcof =
new PacketChannelOpenFailure(
remoteID,
Packets.SSH_OPEN_ADMINISTRATIVELY_PROHIBITED,
"No thanks, unknown port in forwarded-tcpip request",
"");
/* Always try to be polite. */
tm.sendAsynchronousMessage(pcof.getPayload());
log.debug("Unexpected forwarded-tcpip request, denying it!");
return;
}
Channel c = new Channel(this);
synchronized (c) {
c.remoteID = remoteID;
c.remoteWindow = remoteWindow & 0xFFFFffffL; /* convert UINT32 to long */
c.remoteMaxPacketSize = remoteMaxPacketSize;
c.localID = addChannel(c);
}
/*
* The open confirmation message will be sent from another thread.
*/
RemoteAcceptThread rat =
new RemoteAcceptThread(
c,
remoteConnectedAddress,
remoteConnectedPort,
remoteOriginatorAddress,
remoteOriginatorPort,
rfd.targetAddress,
rfd.targetPort);
rat.setDaemon(true);
rat.start();
return;
}
if ((server_state != null) && ("session".equals(channelType))) {
ServerConnectionCallback cb = null;
synchronized (server_state) {
cb = server_state.cb_conn;
}
if (cb == null) {
tm.sendAsynchronousMessage(
new PacketChannelOpenFailure(
remoteID,
Packets.SSH_OPEN_ADMINISTRATIVELY_PROHIBITED,
"Sessions are currently not enabled",
"en")
.getPayload());
return;
}
final Channel c = new Channel(this);
synchronized (c) {
c.remoteID = remoteID;
c.remoteWindow = remoteWindow & 0xFFFFffffL; /* convert UINT32 to long */
c.remoteMaxPacketSize = remoteMaxPacketSize;
c.localID = addChannel(c);
c.state = Channel.STATE_OPEN;
c.ss = new ServerSessionImpl(c);
}
PacketChannelOpenConfirmation pcoc =
new PacketChannelOpenConfirmation(
c.remoteID, c.localID, c.localWindow, c.localMaxPacketSize);
tm.sendAsynchronousMessage(pcoc.getPayload());
c.ss.sscb = cb.acceptSession(c.ss);
return;
}
/* Tell the server that we have no idea what it is talking about */
PacketChannelOpenFailure pcof =
new PacketChannelOpenFailure(
remoteID, Packets.SSH_OPEN_UNKNOWN_CHANNEL_TYPE, "Unknown channel type", "");
tm.sendAsynchronousMessage(pcof.getPayload());
log.warning("The peer tried to open an unsupported channel type (" + channelType + ")");
}
