/**
* This is input reading thread for the pipelined parser. You feed it input through the input
* stream (see the constructor) and it calls back an event listener interface for message
* processing or error. It cleans up the input - dealing with things like line continuation
*/
public void run() {
Pipeline inputStream = this.rawInputStream;
// inputStream = new MyFilterInputStream(this.rawInputStream);
// I cannot use buffered reader here because we may need to switch
// encodings to read the message body.
try {
while (true) {
this.sizeCounter = this.maxMessageSize;
// this.messageSize = 0;
StringBuffer inputBuffer = new StringBuffer();
if (Debug.parserDebug) Debug.println("Starting parse!");
String line1;
String line2 = null;
while (true) {
try {
line1 = readLine(inputStream);
// ignore blank lines.
if (line1.equals("\n")) {
if (Debug.parserDebug) Debug.println("Discarding " + line1);
continue;
} else break;
} catch (IOException ex) {
Debug.printStackTrace(ex);
this.rawInputStream.stopTimer();
return;
}
}
inputBuffer.append(line1);
// Guard against bad guys.
this.rawInputStream.startTimer();
while (true) {
try {
line2 = readLine(inputStream);
inputBuffer.append(line2);
if (line2.trim().equals("")) break;
} catch (IOException ex) {
this.rawInputStream.stopTimer();
Debug.printStackTrace(ex);
return;
}
}
// Stop the timer that will kill the read.
this.rawInputStream.stopTimer();
inputBuffer.append(line2);
StringMsgParser smp = new StringMsgParser(sipMessageListener);
smp.readBody = false;
SIPMessage sipMessage = null;
try {
sipMessage = smp.parseSIPMessage(inputBuffer.toString());
if (sipMessage == null) {
this.rawInputStream.stopTimer();
continue;
}
} catch (ParseException ex) {
// Just ignore the parse exception.
continue;
}
if (Debug.parserDebug) Debug.println("Completed parsing message");
ContentLength cl = (ContentLength) sipMessage.getContentLength();
int contentLength = 0;
if (cl != null) {
contentLength = cl.getContentLength();
} else {
contentLength = 0;
}
if (Debug.parserDebug) {
Debug.println("contentLength " + contentLength);
Debug.println("sizeCounter " + this.sizeCounter);
Debug.println("maxMessageSize " + this.maxMessageSize);
}
if (contentLength == 0) {
sipMessage.removeContent();
} else if (maxMessageSize == 0 || contentLength < this.sizeCounter) {
byte[] message_body = new byte[contentLength];
int nread = 0;
while (nread < contentLength) {
// Start my starvation timer.
// This ensures that the other end
// writes at least some data in
// or we will close the pipe from
// him. This prevents DOS attack
// that takes up all our connections.
this.rawInputStream.startTimer();
try {
int readlength = inputStream.read(message_body, nread, contentLength - nread);
if (readlength > 0) {
nread += readlength;
} else {
break;
}
} catch (IOException ex) {
ex.printStackTrace();
break;
} finally {
// Stop my starvation timer.
this.rawInputStream.stopTimer();
}
}
sipMessage.setMessageContent(message_body);
}
// Content length too large - process the message and
// return error from there.
if (sipMessageListener != null) {
try {
sipMessageListener.processMessage(sipMessage);
} catch (Exception ex) {
// fatal error in processing - close the
// connection.
break;
}
}
}
} finally {
try {
inputStream.close();
} catch (IOException e) {
InternalErrorHandler.handleException(e);
}
}
}
/**
* Parse a buffer containing a single SIP Message where the body is an array of un-interpreted
* bytes. This is intended for parsing the message from a memory buffer when the buffer.
* Incorporates a bug fix for a bug that was noted by Will Sullin of Callcast
*
* @param msgBuffer a byte buffer containing the messages to be parsed. This can consist of
* multiple SIP Messages concatenated together.
* @return a SIPMessage[] structure (request or response) containing the parsed SIP message.
* @exception ParseException is thrown when an illegal message has been encountered (and the rest
* of the buffer is discarded).
* @see ParseExceptionListener
*/
public SIPMessage parseSIPMessage(
byte[] msgBuffer, boolean readBody, boolean strict, ParseExceptionListener exhandler)
throws ParseException {
if (msgBuffer == null || msgBuffer.length == 0) return null;
int i = 0;
// Squeeze out any leading control character.
try {
while (msgBuffer[i] < 0x20) i++;
} catch (ArrayIndexOutOfBoundsException e) {
// Array contains only control char, return null.
return null;
}
// Iterate thru the request/status line and headers.
char[] currentLine = null;
char[] currentHeader = null;
boolean isFirstLine = true;
SIPMessage message = null;
do {
currentLine = null;
int lineStart = i;
// Find the length of the line.
try {
while (msgBuffer[i] != '\r' && msgBuffer[i] != '\n') i++;
} catch (ArrayIndexOutOfBoundsException e) {
// End of the message.
break;
}
int lineLength = i - lineStart;
ByteBuffer bb = ByteBuffer.wrap(msgBuffer, lineStart, lineLength);
currentLine = charset.decode(bb).array();
currentLine = trimEndOfLine(currentLine);
if (currentLine.length == 0) {
// Last header line, process the previous buffered header.
if (currentHeader != null && message != null) {
processHeader(currentHeader, message, exhandler, msgBuffer);
}
} else {
if (isFirstLine) {
message = processFirstLine(currentLine, exhandler, msgBuffer);
} else {
char firstChar = currentLine[0];
if (firstChar == '\t' || firstChar == ' ') {
if (currentHeader == null) throw new ParseException("Bad header continuation.", 0);
// This is a continuation, append it to the previous line.
// currentHeader += currentLine.substring(1);
char[] retval = new char[currentHeader.length + currentLine.length - 1];
System.arraycopy(currentHeader, 0, retval, 0, currentHeader.length);
System.arraycopy(
currentHeader, currentHeader.length, currentLine, 1, currentLine.length);
} else {
if (currentHeader != null && message != null) {
processHeader(currentHeader, message, exhandler, msgBuffer);
}
currentHeader = new char[currentLine.length + 1];
System.arraycopy(currentLine, 0, currentHeader, 0, currentLine.length);
currentHeader[currentLine.length] = '\n';
}
}
}
if (msgBuffer[i] == '\r' && msgBuffer.length > i + 1 && msgBuffer[i + 1] == '\n') i++;
i++;
isFirstLine = false;
} while (currentLine.length > 0); // End do - while
currentLine = null;
currentHeader = null;
if (message == null) throw new ParseException("Bad message", 0);
message.setSize(i);
// Check for content legth header
if (readBody && message.getContentLength() != null) {
if (message.getContentLength().getContentLength() != 0) {
int bodyLength = msgBuffer.length - i;
byte[] body = new byte[bodyLength];
System.arraycopy(msgBuffer, i, body, 0, bodyLength);
message.setMessageContent(
body,
!strict,
computeContentLengthFromMessage,
message.getContentLength().getContentLength());
} else if (!computeContentLengthFromMessage
&& message.getContentLength().getContentLength() == 0 & strict) {
String last4Chars = new String(msgBuffer, msgBuffer.length - 4, 4);
if (!"\r\n\r\n".equals(last4Chars)) {
throw new ParseException("Extraneous characters at the end of the message ", i);
}
}
}
return message;
}
