Examples with SIPMessage gov.nist.javax.sip.message.SIPMessage used on opensource projects

Example 6 with SIPMessage

use of gov.nist.javax.sip.message.SIPMessage in project XobotOS by xamarin.

the class StringMsgParser method parseSIPMessage.

/**
     * 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) 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.
    String currentLine = null;
    String currentHeader = null;
    boolean isFirstLine = true;
    SIPMessage message = null;
    do {
        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;
        // Make it a String.
        try {
            currentLine = new String(msgBuffer, lineStart, lineLength, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            throw new ParseException("Bad message encoding!", 0);
        }
        currentLine = trimEndOfLine(currentLine);
        if (currentLine.length() == 0) {
            // Last header line, process the previous buffered header.
            if (currentHeader != null && message != null) {
                processHeader(currentHeader, message);
            }
        } else {
            if (isFirstLine) {
                message = processFirstLine(currentLine);
            } else {
                char firstChar = currentLine.charAt(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);
                } else {
                    if (currentHeader != null && message != null) {
                        processHeader(currentHeader, message);
                    }
                    currentHeader = currentLine;
                }
            }
        }
        if (msgBuffer[i] == '\r' && msgBuffer.length > i + 1 && msgBuffer[i + 1] == '\n')
            i++;
        i++;
        isFirstLine = false;
    } while (// End do - while
    currentLine.length() > 0);
    if (message == null)
        throw new ParseException("Bad message", 0);
    message.setSize(i);
    if (readBody && message.getContentLength() != null && message.getContentLength().getContentLength() != 0) {
        int bodyLength = msgBuffer.length - i;
        byte[] body = new byte[bodyLength];
        System.arraycopy(msgBuffer, i, body, 0, bodyLength);
        message.setMessageContent(body, computeContentLengthFromMessage, message.getContentLength().getContentLength());
    }
    return message;
}

Example 7 with SIPMessage

use of gov.nist.javax.sip.message.SIPMessage in project XobotOS by xamarin.

the class SIPServerTransaction method sendResponse.

/*
     * (non-Javadoc)
     *
     * @see javax.sip.ServerTransaction#sendResponse(javax.sip.message.Response)
     */
public void sendResponse(Response response) throws SipException {
    SIPResponse sipResponse = (SIPResponse) response;
    SIPDialog dialog = this.dialog;
    if (response == null)
        throw new NullPointerException("null response");
    try {
        sipResponse.checkHeaders();
    } catch (ParseException ex) {
        throw new SipException(ex.getMessage());
    }
    // check for meaningful response.
    if (!sipResponse.getCSeq().getMethod().equals(this.getMethod())) {
        throw new SipException("CSeq method does not match Request method of request that created the tx.");
    }
    /*
         * 200-class responses to SUBSCRIBE requests also MUST contain an "Expires" header. The
         * period of time in the response MAY be shorter but MUST NOT be longer than specified in
         * the request.
         */
    if (this.getMethod().equals(Request.SUBSCRIBE) && response.getStatusCode() / 100 == 2) {
        if (response.getHeader(ExpiresHeader.NAME) == null) {
            throw new SipException("Expires header is mandatory in 2xx response of SUBSCRIBE");
        } else {
            Expires requestExpires = (Expires) this.getOriginalRequest().getExpires();
            Expires responseExpires = (Expires) response.getExpires();
            /*
                 * If no "Expires" header is present in a SUBSCRIBE request, the implied default
                 * is defined by the event package being used.
                 */
            if (requestExpires != null && responseExpires.getExpires() > requestExpires.getExpires()) {
                throw new SipException("Response Expires time exceeds request Expires time : See RFC 3265 3.1.1");
            }
        }
    }
    // Check for mandatory header.
    if (sipResponse.getStatusCode() == 200 && sipResponse.getCSeq().getMethod().equals(Request.INVITE) && sipResponse.getHeader(ContactHeader.NAME) == null)
        throw new SipException("Contact Header is mandatory for the OK to the INVITE");
    if (!this.isMessagePartOfTransaction((SIPMessage) response)) {
        throw new SipException("Response does not belong to this transaction.");
    }
    // Fix up the response if the dialog has already been established.
    try {
        /*
             * The UAS MAY send a final response to the initial request before
             * having received PRACKs for all unacknowledged reliable provisional responses,
             * unless the final response is 2xx and any of the unacknowledged reliable provisional
             * responses contained a session description. In that case, it MUST NOT send a final
             * response until those provisional responses are acknowledged.
             */
        if (this.pendingReliableResponse != null && this.getDialog() != null && this.getState() != TransactionState.TERMINATED && ((SIPResponse) response).getContentTypeHeader() != null && response.getStatusCode() / 100 == 2 && ((SIPResponse) response).getContentTypeHeader().getContentType().equalsIgnoreCase("application") && ((SIPResponse) response).getContentTypeHeader().getContentSubType().equalsIgnoreCase("sdp")) {
            try {
                boolean acquired = this.provisionalResponseSem.tryAcquire(1, TimeUnit.SECONDS);
                if (!acquired) {
                    throw new SipException("cannot send response -- unacked povisional");
                }
            } catch (Exception ex) {
                this.sipStack.getStackLogger().logError("Could not acquire PRACK sem ", ex);
            }
        } else {
            // pending response task.
            if (this.pendingReliableResponse != null && sipResponse.isFinalResponse()) {
                this.provisionalResponseTask.cancel();
                this.provisionalResponseTask = null;
            }
        }
        // being sent makes sense.
        if (dialog != null) {
            if (sipResponse.getStatusCode() / 100 == 2 && sipStack.isDialogCreated(sipResponse.getCSeq().getMethod())) {
                if (dialog.getLocalTag() == null && sipResponse.getTo().getTag() == null) {
                    // Trying to send final response and user forgot to set
                    // to
                    // tag on the response -- be nice and assign the tag for
                    // the user.
                    sipResponse.getTo().setTag(Utils.getInstance().generateTag());
                } else if (dialog.getLocalTag() != null && sipResponse.getToTag() == null) {
                    sipResponse.setToTag(dialog.getLocalTag());
                } else if (dialog.getLocalTag() != null && sipResponse.getToTag() != null && !dialog.getLocalTag().equals(sipResponse.getToTag())) {
                    throw new SipException("Tag mismatch dialogTag is " + dialog.getLocalTag() + " responseTag is " + sipResponse.getToTag());
                }
            }
            if (!sipResponse.getCallId().getCallId().equals(dialog.getCallId().getCallId())) {
                throw new SipException("Dialog mismatch!");
            }
        }
        // Backward compatibility slippery slope....
        // Only set the from tag in the response when the
        // incoming request has a from tag.
        String fromTag = ((SIPRequest) this.getRequest()).getFrom().getTag();
        if (fromTag != null && sipResponse.getFromTag() != null && !sipResponse.getFromTag().equals(fromTag)) {
            throw new SipException("From tag of request does not match response from tag");
        } else if (fromTag != null) {
            sipResponse.getFrom().setTag(fromTag);
        } else {
            if (sipStack.isLoggingEnabled())
                sipStack.getStackLogger().logDebug("WARNING -- Null From tag in request!!");
        }
        // or if the state of the dialog needs to be changed.
        if (dialog != null && response.getStatusCode() != 100) {
            dialog.setResponseTags(sipResponse);
            DialogState oldState = dialog.getState();
            dialog.setLastResponse(this, (SIPResponse) response);
            if (oldState == null && dialog.getState() == DialogState.TERMINATED) {
                DialogTerminatedEvent event = new DialogTerminatedEvent(dialog.getSipProvider(), dialog);
                // Provide notification to the listener that the dialog has
                // ended.
                dialog.getSipProvider().handleEvent(event, this);
            }
        } else if (dialog == null && this.getMethod().equals(Request.INVITE) && this.retransmissionAlertEnabled && this.retransmissionAlertTimerTask == null && response.getStatusCode() / 100 == 2) {
            String dialogId = ((SIPResponse) response).getDialogId(true);
            this.retransmissionAlertTimerTask = new RetransmissionAlertTimerTask(dialogId);
            sipStack.retransmissionAlertTransactions.put(dialogId, this);
            sipStack.getTimer().schedule(this.retransmissionAlertTimerTask, 0, SIPTransactionStack.BASE_TIMER_INTERVAL);
        }
        // Send message after possibly inserting the Dialog
        // into the dialog table to avoid a possible race condition.
        this.sendMessage((SIPResponse) response);
        if (dialog != null) {
            dialog.startRetransmitTimer(this, (SIPResponse) response);
        }
    } catch (IOException ex) {
        if (sipStack.isLoggingEnabled())
            sipStack.getStackLogger().logException(ex);
        this.setState(TransactionState.TERMINATED);
        raiseErrorEvent(SIPTransactionErrorEvent.TRANSPORT_ERROR);
        throw new SipException(ex.getMessage());
    } catch (java.text.ParseException ex1) {
        if (sipStack.isLoggingEnabled())
            sipStack.getStackLogger().logException(ex1);
        this.setState(TransactionState.TERMINATED);
        throw new SipException(ex1.getMessage());
    }
}