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/*
* JBoss, Home of Professional Open Source
* Copyright 2011, Red Hat, Inc. and individual contributors
* Copyright 2019, Mobius Software LTD and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.restcomm.protocols.ss7.sccp.impl.message;
import org.apache.logging.log4j.Logger;
import org.restcomm.protocols.ss7.sccp.LongMessageRuleType;
import org.restcomm.protocols.ss7.sccp.SccpProtocolVersion;
import org.restcomm.protocols.ss7.sccp.impl.SccpStackImpl;
import org.restcomm.protocols.ss7.sccp.impl.parameter.LocalReferenceImpl;
import org.restcomm.protocols.ss7.sccp.impl.parameter.SequencingSegmentingImpl;
import org.restcomm.protocols.ss7.sccp.message.ParseException;
import org.restcomm.protocols.ss7.sccp.message.SccpConnDt2Message;
import org.restcomm.protocols.ss7.sccp.parameter.ParameterFactory;
import org.restcomm.protocols.ss7.sccp.parameter.ReturnCauseValue;
import org.restcomm.protocols.ss7.sccp.parameter.SequenceNumber;
import org.restcomm.protocols.ss7.sccp.parameter.SequencingSegmenting;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
/**
*
* @author yulianoifa
*
*/
public class SccpConnDt2MessageImpl extends SccpConnSegmentableMessageImpl implements SccpConnDt2Message {
protected SequencingSegmenting sequencingSegmenting;
public SccpConnDt2MessageImpl(int maxDataLen, int sls, int localSsn) {
super(maxDataLen, MESSAGE_TYPE_DT2, sls, localSsn);
}
protected SccpConnDt2MessageImpl(int maxDataLen, int incomingOpc, int incomingDpc, int incomingSls, int networkId) {
super(maxDataLen, MESSAGE_TYPE_DT2, incomingOpc, incomingDpc, incomingSls, networkId);
}
@Override
public SequencingSegmenting getSequencingSegmenting() {
return sequencingSegmenting;
}
@Override
public void setSequencingSegmenting(SequencingSegmenting sequencingSegmenting) {
this.sequencingSegmenting = sequencingSegmenting;
}
@Override
public void decode(ByteBuf buffer, ParameterFactory factory, SccpProtocolVersion sccpProtocolVersion) throws ParseException {
LocalReferenceImpl ref = new LocalReferenceImpl();
ref.decode(buffer, factory, sccpProtocolVersion);
destinationLocalReferenceNumber = ref;
SequencingSegmentingImpl sequencing = new SequencingSegmentingImpl();
sequencing.decode(buffer, factory, sccpProtocolVersion);
sequencingSegmenting = sequencing;
int dataPointer = buffer.readByte() & 0xFF;
buffer.markReaderIndex();
buffer.skipBytes(dataPointer - 1);
int len = buffer.readByte() & 0xff;
userData = buffer.slice(buffer.readerIndex(), len);
}
@Override
public EncodingResultData encode(SccpStackImpl sccpStackImpl, LongMessageRuleType longMessageRuleType, int maxMtp3UserDataLength, Logger logger, boolean removeSPC, SccpProtocolVersion sccpProtocolVersion) throws ParseException {
if (type == 0) {
return new EncodingResultData(EncodingResult.MessageTypeMissing, null, null, null);
}
if (destinationLocalReferenceNumber == null) {
return new EncodingResultData(EncodingResult.DestinationLocalReferenceNumberMissing, null, null, null);
}
if (sequencingSegmenting == null) {
return new EncodingResultData(EncodingResult.SequencingSegmentingMissing, null, null, null);
}
if (userData == null) {
return new EncodingResultData(EncodingResult.DataMissed, null, null, null);
}
ByteBuf bf = userData;
if(userData!=null)
bf=Unpooled.wrappedBuffer(bf);
// 8 = 6 (fixed fields length) + 1 (variable fields pointers) + 1
// (variable fields lengths)
int fieldsLen = 8;
int availLen = maxMtp3UserDataLength - fieldsLen;
if (availLen > 256)
availLen = 256;
int bfBytes=0;
if(bf!=null)
bfBytes=bf.readableBytes();
if (bfBytes > availLen) { // message is too long
if (logger.isWarnEnabled()) {
logger.warn(String.format(
"Failure when sending a DT2 message: message is too long. SccpMessageSegment=%s", this));
}
return new EncodingResultData(EncodingResult.ReturnFailure, null, null, ReturnCauseValue.SEG_NOT_SUPPORTED);
}
ByteBuf output = Unpooled.buffer(fieldsLen+2);
output.writeByte(type);
((LocalReferenceImpl) destinationLocalReferenceNumber).encode(output,sccpStackImpl.isRemoveSpc(), sccpStackImpl.getSccpProtocolVersion());
((SequencingSegmentingImpl) sequencingSegmenting).encode(output,sccpStackImpl.isRemoveSpc(), sccpStackImpl.getSccpProtocolVersion());
// we have 1 pointers (data), cdp starts after 1 octets then
int len = 1;
output.writeByte(len);
output.writeByte((byte) bfBytes);
if(bf!=null)
output=Unpooled.wrappedBuffer(output,bf);
return new EncodingResultData(EncodingResult.Success, output, null, null);
}
@Override
public boolean isMoreData() {
return sequencingSegmenting.isMoreData();
}
@Override
public void setMoreData(boolean moreData) {
if (sequencingSegmenting == null) {
// sendSequenceNumber and receiveSequenceNumber are later re-initialized in MessageSender
sequencingSegmenting = new SequencingSegmentingImpl();
}
sequencingSegmenting.setMoreData(moreData);
}
public void setSequencing(SequenceNumber sendSequenceNumber, SequenceNumber receiveSequenceNumber) {
if (sequencingSegmenting == null) {
// sendSequenceNumber and receiveSequenceNumber are later re-initialized in MessageSender
sequencingSegmenting = new SequencingSegmentingImpl();
}
sequencingSegmenting.setSendSequenceNumber(sendSequenceNumber);
sequencingSegmenting.setReceiveSequenceNumber(receiveSequenceNumber);
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("Sccp Msg [Type=DT2");
sb.append(" networkId=");
sb.append(this.networkId);
sb.append(" sls=");
sb.append(this.sls);
sb.append(" incomingOpc=");
sb.append(this.incomingOpc);
sb.append(" incomingDpc=");
sb.append(this.incomingDpc);
sb.append(" outgoingDpc=");
sb.append(this.outgoingDpc);
sb.append(" DataLen=");
if (this.userData != null)
sb.append(this.userData.readableBytes());
sb.append(" destLR=");
if (this.destinationLocalReferenceNumber != null)
sb.append(this.destinationLocalReferenceNumber.getValue());
sb.append(" sequencingSegmenting=");
if (this.sequencingSegmenting != null)
sb.append(this.sequencingSegmenting);
sb.append(" isMtpOriginated=");
sb.append(this.isMtpOriginated);
sb.append("]");
return sb.toString();
}
}
