private void processHandshake() throws IOException {
boolean read;
do {
read = false;
/*
* We need the first 4 bytes, they contain type and length of the message.
*/
if (handshakeQueue.size() >= 4) {
byte[] beginning = new byte[4];
handshakeQueue.read(beginning, 0, 4, 0);
ByteArrayInputStream bis = new ByteArrayInputStream(beginning);
short type = TlsUtils.readUint8(bis);
int len = TlsUtils.readUint24(bis);
/*
* Check if we have enough bytes in the buffer to read the full message.
*/
if (handshakeQueue.size() >= (len + 4)) {
/*
* Read the message.
*/
byte[] buf = new byte[len];
handshakeQueue.read(buf, 0, len, 4);
handshakeQueue.removeData(len + 4);
/*
* RFC 2246 7.4.9. The value handshake_messages includes all handshake
* messages starting at client hello up to, but not including, this
* finished message. [..] Note: [Also,] Hello Request messages are
* omitted from handshake hashes.
*/
switch (type) {
case HandshakeType.hello_request:
case HandshakeType.finished:
break;
default:
rs.updateHandshakeData(beginning, 0, 4);
rs.updateHandshakeData(buf, 0, len);
break;
}
/*
* Now, parse the message.
*/
processHandshakeMessage(type, buf);
read = true;
}
}
} while (read);
}
/**
* Read data from the network. The method will return immediately, if there is still some data
* left in the buffer, or block until some application data has been read from the network.
*
* @param buf The buffer where the data will be copied to.
* @param offset The position where the data will be placed in the buffer.
* @param len The maximum number of bytes to read.
* @return The number of bytes read.
* @throws IOException If something goes wrong during reading data.
*/
protected int readApplicationData(byte[] buf, int offset, int len) throws IOException {
while (applicationDataQueue.size() == 0) {
/*
* We need to read some data.
*/
if (this.closed) {
if (this.failedWithError) {
/*
* Something went terribly wrong, we should throw an IOException
*/
throw new IOException(TLS_ERROR_MESSAGE);
}
/*
* Connection has been closed, there is no more data to read.
*/
return -1;
}
safeReadData();
}
len = Math.min(len, applicationDataQueue.size());
applicationDataQueue.read(buf, offset, len, 0);
applicationDataQueue.removeData(len);
return len;
}
/**
* This method is called, when a change cipher spec message is received.
*
* @throws IOException If the message has an invalid content or the handshake is not in the
* correct state.
*/
private void processChangeCipherSpec() throws IOException {
while (changeCipherSpecQueue.size() > 0) {
/*
* A change cipher spec message is only one byte with the value 1.
*/
byte[] b = new byte[1];
changeCipherSpecQueue.read(b, 0, 1, 0);
changeCipherSpecQueue.removeData(1);
if (b[0] != 1) {
/*
* This should never happen.
*/
this.failWithError(AlertLevel.fatal, AlertDescription.unexpected_message);
}
/*
* Check if we are in the correct connection state.
*/
if (this.connection_state != CS_CLIENT_FINISHED_SEND) {
this.failWithError(AlertLevel.fatal, AlertDescription.handshake_failure);
}
rs.serverClientSpecReceived();
this.connection_state = CS_SERVER_CHANGE_CIPHER_SPEC_RECEIVED;
}
}
/** Look for new input from the ptty, send it to the terminal emulator. */
private void readFromProcess() {
int bytesAvailable = mByteQueue.getBytesAvailable();
int bytesToRead = Math.min(bytesAvailable, mReceiveBuffer.length);
int bytesRead = 0;
try {
bytesRead = mByteQueue.read(mReceiveBuffer, 0, bytesToRead);
} catch (InterruptedException e) {
return;
}
// Give subclasses a chance to process the read data
processInput(mReceiveBuffer, 0, bytesRead);
notifyUpdate();
}
private void processAlert() throws IOException {
while (alertQueue.size() >= 2) {
/*
* An alert is always 2 bytes. Read the alert.
*/
byte[] tmp = new byte[2];
alertQueue.read(tmp, 0, 2, 0);
alertQueue.removeData(2);
short level = tmp[0];
short description = tmp[1];
if (level == AlertLevel.fatal) {
/*
* This is a fatal error.
*/
this.failedWithError = true;
this.closed = true;
/*
* Now try to close the stream, ignore errors.
*/
try {
rs.close();
} catch (Exception e) {
}
throw new IOException(TLS_ERROR_MESSAGE);
} else {
/*
* This is just a warning.
*/
if (description == AlertDescription.close_notify) {
/*
* Close notify
*/
this.failWithError(AlertLevel.warning, AlertDescription.close_notify);
}
/*
* If it is just a warning, we continue.
*/
}
}
}