Added method to decode an ISUP message to a list of parameters.
git-svn-id: http://voip.null.ro/svn/yate@1617 acf43c95-373e-0410-b603-e72c3f656dc1
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marian
parent
0559e42e1e
commit
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@ -2293,6 +2293,115 @@ SS7MSU* SS7ISUP::buildMSU(SS7MsgISUP::Type type, unsigned char sio,
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return msu;
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}
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// Decode a buffer to a list of parameters
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bool SS7ISUP::decodeMessage(NamedList& msg,
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SS7MsgISUP::Type msgType, SS7PointCode::Type pcType,
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const unsigned char* paramPtr, unsigned int paramLen)
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{
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// see what parameters we expect for this message
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const MsgParams* params = getIsupParams(pcType,msgType);
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if (!params) {
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Debug(this,DebugGoOn,"Invalid point code or message type [%p]",this);
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return false;
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}
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const SS7MsgISUP::Parameters* plist = params->params;
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SS7MsgISUP::Parameters ptype;
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// first decode any mandatory fixed parameters the message should have
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while ((ptype = *plist++) != SS7MsgISUP::EndOfParameters) {
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const IsupParam* param = getParamDesc(ptype);
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if (!param) {
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// this is fatal as we don't know the length
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Debug(this,DebugGoOn,"Missing description of fixed ISUP parameter 0x%02x [%p]",ptype,this);
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return false;
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}
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if (!param->size) {
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Debug(this,DebugGoOn,"Invalid (variable) description of fixed ISUP parameter %s [%p]",param->name,this);
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return false;
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}
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if (paramLen < param->size) {
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Debug(this,DebugWarn,"Truncated ISUP message! [%p]",this);
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return false;
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}
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if (!decodeParam(this,msg,param,paramPtr,param->size))
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Debug(this,DebugWarn,"Could not decode fixed ISUP parameter %s [%p]",param->name,this);
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paramPtr += param->size;
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paramLen -= param->size;
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} // while ((ptype = *plist++)...
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// next decode any mandatory variable parameters the message should have
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while ((ptype = *plist++) != SS7MsgISUP::EndOfParameters) {
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const IsupParam* param = getParamDesc(ptype);
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if (!param) {
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// we could skip over unknown mandatory variable length but it's still bad
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Debug(this,DebugGoOn,"Missing description of variable ISUP parameter 0x%02x [%p]",ptype,this);
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return false;
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}
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if (param->size)
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Debug(this,DebugMild,"Invalid (fixed) description of variable ISUP parameter %s [%p]",param->name,this);
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unsigned int offs = paramPtr[0];
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if ((offs < 1) || (offs >= paramLen)) {
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Debug(this,DebugWarn,"Invalid offset %u (len=%u) ISUP parameter %s [%p]",
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offs,paramLen,param->name,this);
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return false;
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}
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unsigned int size = paramPtr[offs];
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if ((size < 1) || (offs+size >= paramLen)) {
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Debug(this,DebugWarn,"Invalid size %u (ofs=%u, len=%u) ISUP parameter %s [%p]",
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size,offs,paramLen,param->name,this);
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return false;
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}
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if (!decodeParam(this,msg,param,paramPtr+offs+1,size))
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Debug(this,DebugWarn,"Could not decode variable ISUP parameter %s (size=%u) [%p]",
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param->name,size,this);
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paramPtr++;
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paramLen--;
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} // while ((ptype = *plist++)...
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// now decode the optional parameters if the message supports them
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if (params->optional) {
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unsigned int offs = paramPtr[0];
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if (offs >= paramLen) {
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Debug(this,DebugWarn,"Invalid ISUP optional offset %u (len=%u) [%p]",
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offs,paramLen,this);
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return false;
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}
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else if (offs) {
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// advance pointer past mandatory parameters
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paramPtr += offs;
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paramLen -= offs;
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while (paramLen) {
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ptype = (SS7MsgISUP::Parameters)(*paramPtr++);
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paramLen--;
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if (ptype == SS7MsgISUP::EndOfParameters)
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break;
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if (paramLen < 2) {
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Debug(this,DebugWarn,"Only %u octets while decoding optional ISUP parameter 0x%02x [%p]",
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paramLen,ptype,this);
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return false;
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}
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unsigned int size = *paramPtr++;
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paramLen--;
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if ((size < 1) || (size >= paramLen)) {
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Debug(this,DebugWarn,"Invalid size %u (len=%u) ISUP optional parameter 0x%02x [%p]",
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size,paramLen,ptype,this);
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return false;
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}
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const IsupParam* param = getParamDesc(ptype);
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if (!param)
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Debug(this,DebugMild,"Unknown optional ISUP parameter 0x%02x (size=%u) [%p]",ptype,size,this);
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else if (!decodeParam(this,msg,param,paramPtr,size))
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Debug(this,DebugWarn,"Could not decode optional ISUP parameter %s (size=%u) [%p]",param->name,size,this);
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paramPtr += size;
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paramLen -= size;
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} // while (paramLen)
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} // else if (offs)
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else
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paramLen = 0;
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}
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if (paramLen)
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Debug(this,DebugWarn,"Got %u garbage octets after message type 0x%02x [%p]",
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paramLen,msgType,this);
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return true;
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}
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bool SS7ISUP::receivedMSU(const SS7MSU& msu, const SS7Label& label, SS7Layer3* network, int sls)
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{
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if (msu.getSIF() != SS7MSU::ISUP || !hasPointCode(label.dpc())) {
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@ -2330,115 +2439,12 @@ bool SS7ISUP::processMSU(SS7MsgISUP::Type type, unsigned int cic,
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{
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XDebug(this,DebugAll,"SS7ISUP::processMSU(%u,%u,%p,%u,%p,%p,%d) [%p]",
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type,cic,paramPtr,paramLen,&label,network,sls,this);
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// see what parameters we expect for this message
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const MsgParams* params = getIsupParams(label.type(),type);
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if (!params)
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return false;
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SS7MsgISUP* msg = new SS7MsgISUP(type,cic);
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const SS7MsgISUP::Parameters* plist = params->params;
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SS7MsgISUP::Parameters ptype;
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// first decode any mandatory fixed parameters the message should have
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while ((ptype = *plist++) != SS7MsgISUP::EndOfParameters) {
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const IsupParam* param = getParamDesc(ptype);
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if (!param) {
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// this is fatal as we don't know the length
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Debug(this,DebugGoOn,"Missing description of fixed ISUP parameter 0x%02x [%p]",ptype,this);
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msg->destruct();
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return false;
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}
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if (!param->size) {
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Debug(this,DebugGoOn,"Invalid (variable) description of fixed ISUP parameter %s [%p]",param->name,this);
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msg->destruct();
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return false;
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}
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if (paramLen < param->size) {
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Debug(this,DebugWarn,"Truncated ISUP message! [%p]",this);
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msg->destruct();
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return false;
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}
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if (!decodeParam(this,msg->params(),param,paramPtr,param->size))
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Debug(this,DebugWarn,"Could not decode fixed ISUP parameter %s [%p]",param->name,this);
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paramPtr += param->size;
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paramLen -= param->size;
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} // while ((ptype = *plist++)...
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// next decode any mandatory variable parameters the message should have
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while ((ptype = *plist++) != SS7MsgISUP::EndOfParameters) {
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const IsupParam* param = getParamDesc(ptype);
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if (!param) {
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// we could skip over unknown mandatory variable length but it's still bad
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Debug(this,DebugGoOn,"Missing description of variable ISUP parameter 0x%02x [%p]",ptype,this);
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msg->destruct();
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return false;
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}
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if (param->size)
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Debug(this,DebugMild,"Invalid (fixed) description of variable ISUP parameter %s [%p]",param->name,this);
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unsigned int offs = paramPtr[0];
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if ((offs < 1) || (offs >= paramLen)) {
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Debug(this,DebugWarn,"Invalid offset %u (len=%u) ISUP parameter %s [%p]",
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offs,paramLen,param->name,this);
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msg->destruct();
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return false;
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}
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unsigned int size = paramPtr[offs];
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if ((size < 1) || (offs+size >= paramLen)) {
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Debug(this,DebugWarn,"Invalid size %u (ofs=%u, len=%u) ISUP parameter %s [%p]",
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size,offs,paramLen,param->name,this);
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msg->destruct();
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return false;
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}
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if (!decodeParam(this,msg->params(),param,paramPtr+offs+1,size))
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Debug(this,DebugWarn,"Could not decode variable ISUP parameter %s (size=%u) [%p]",
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param->name,size,this);
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paramPtr++;
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paramLen--;
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} // while ((ptype = *plist++)...
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// now decode the optional parameters if the message supports them
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if (params->optional) {
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unsigned int offs = paramPtr[0];
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if (offs >= paramLen) {
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Debug(this,DebugWarn,"Invalid ISUP optional offset %u (len=%u) [%p]",
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offs,paramLen,this);
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msg->destruct();
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return false;
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}
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else if (offs) {
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// advance pointer past mandatory parameters
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paramPtr += offs;
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paramLen -= offs;
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while (paramLen) {
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ptype = (SS7MsgISUP::Parameters)(*paramPtr++);
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paramLen--;
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if (ptype == SS7MsgISUP::EndOfParameters)
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break;
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if (paramLen < 2) {
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Debug(this,DebugWarn,"Only %u octets while decoding optional ISUP parameter 0x%02x [%p]",
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paramLen,ptype,this);
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msg->destruct();
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return false;
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}
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unsigned int size = *paramPtr++;
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paramLen--;
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if ((size < 1) || (size >= paramLen)) {
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Debug(this,DebugWarn,"Invalid size %u (len=%u) ISUP optional parameter 0x%02x [%p]",
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size,paramLen,ptype,this);
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msg->destruct();
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return false;
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}
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const IsupParam* param = getParamDesc(ptype);
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if (!param)
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Debug(this,DebugMild,"Unknown optional ISUP parameter 0x%02x (size=%u) [%p]",ptype,size,this);
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else if (!decodeParam(this,msg->params(),param,paramPtr,size))
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Debug(this,DebugWarn,"Could not decode optional ISUP parameter %s (size=%u) [%p]",param->name,size,this);
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paramPtr += size;
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paramLen -= size;
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} // while (paramLen)
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} // else if (offs)
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else
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paramLen = 0;
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if (!decodeMessage(msg->params(),type,label.type(),paramPtr,paramLen)) {
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TelEngine::destruct(msg);
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return false;
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}
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if (paramLen)
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Debug(this,DebugWarn,"Got %u garbage octets after message type 0x%02x [%p]",
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paramLen,type,this);
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if (debugAt(DebugInfo)) {
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String tmp;
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@ -4896,6 +4896,18 @@ public:
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*/
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virtual void destruct();
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/**
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* Decode an ISUP message buffer to a list of parameters
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* @param msg Destination list of parameters
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* @param msgType The message type
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* @param pcType The point code type (message version)
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* @param paramPtr Pointer to the Parameter area (just after the message type)
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* @param paramLen Length of the Parameter area
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* @return True if the mesage was succesfully parsed
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*/
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bool decodeMessage(NamedList& msg, SS7MsgISUP::Type msgType, SS7PointCode::Type pcType,
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const unsigned char* paramPtr, unsigned int paramLen);
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protected:
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/**
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* Send CGU if not already done. Check timeouts
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