public Channel openDirectTCPIPChannel(
String host_to_connect,
int port_to_connect,
String originator_IP_address,
int originator_port)
throws IOException {
Channel c = new Channel(this);
synchronized (c) {
c.localID = addChannel(c);
// end of synchronized block forces writing out to main memory
}
PacketOpenDirectTCPIPChannel dtc =
new PacketOpenDirectTCPIPChannel(
c.localID,
c.localWindow,
c.localMaxPacketSize,
host_to_connect,
port_to_connect,
originator_IP_address,
originator_port);
tm.sendMessage(dtc.getPayload());
waitUntilChannelOpen(c);
return c;
}
public Channel openSessionChannel() throws IOException {
Channel c = new Channel(this);
synchronized (c) {
c.localID = addChannel(c);
// end of synchronized block forces the writing out to main memory
}
log.debug("Sending SSH_MSG_CHANNEL_OPEN (Channel " + c.localID + ")");
PacketOpenSessionChannel smo =
new PacketOpenSessionChannel(c.localID, c.localWindow, c.localMaxPacketSize);
tm.sendMessage(smo.getPayload());
waitUntilChannelOpen(c);
return c;
}
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 + ")");
}