I am trying to create a sample application using the Microsoft WinSNMP library to create an example trap. See the sample code below:
//Send a trap; LPSTR strSrcAddr = "10.12.0.21"; LPSTR strDstAddr = "10.2.255.8"; UINT32 nDstPort = 462; smiINT snmpPduType = SNMP_PDU_TRAP; HSNMP_VBL snmpVarBindList = SnmpCreateVbl(snmpSession, NULL, NULL); assert(snmpVarBindList != SNMPAPI_FAILURE); //Copy the src address to src entity; HSNMP_ENTITY snmpSrcEntity = SnmpStrToEntity(snmpSession, strSrcAddr); assert(snmpSrcEntity != SNMPAPI_FAILURE); //Copy the dst address to dst entity; HSNMP_ENTITY snmpDstEntity = SnmpStrToEntity(snmpSession, strDstAddr); assert(snmpDstEntity != SNMPAPI_FAILURE); //Assign the dst entity the trap port; snmpStatus = SnmpSetPort(snmpDstEntity, nDstPort); assert(snmpStatus != SNMPAPI_FAILURE); //Create the pdu, assigning it the TRAP_TYPE; HSNMP_PDU snmpPdu = SnmpCreatePdu(snmpSession, snmpPduType, NULL, NULL, NULL, snmpVarBindList); assert(snmpPdu != SNMPAPI_FAILURE); //Send the msg; smiBYTE pByteData[] = "public\0"; smiOCTETS snmpCtxOctects = {6, (smiLPBYTE)pByteData}; HSNMP_CONTEXT snmpCtxt = SnmpStrToContext(snmpSession, &snmpCtxOctects); assert(snmpCtxt != SNMPAPI_FAILURE); ////////////////////////////////// // // Create the PDU and set Data; // ////////////////////////////////// ///// //-- Set the sysUpTime; ///// CHAR pOidSysUpTimeArray[] = "1.3.6.1.2.1.1.3.0\0"; smiOID snmpOidSysUpTime = {0}; snmpStatus = SnmpStrToOid(pOidSysUpTimeArray, &snmpOidSysUpTime); assert(snmpStatus != SNMPAPI_FAILURE); smiVALUE smiValueSysUpTime = {0}; smiValueSysUpTime.syntax = SNMP_SYNTAX_TIMETICKS; smiValueSysUpTime.value.uNumber = 40000; //Random up-time; snmpStatus = SnmpSetVb(snmpVarBindList, 0, &snmpOidSysUpTime, &smiValueSysUpTime); assert(snmpStatus != SNMPAPI_FAILURE); ///// //-- Now set the snmpTrapOid; ///// CHAR pOidSnmpTrapOid[] = "1.3.6.1.6.3.1.1.4.1.0\0"; CHAR pOidSnmpOidOfEntTrap[] = "1.3.6.1.4.1.37086.2.0.1\0"; smiOID snmpOidOfEntTrap = {0}; smiOID snmpOidTrapOid = {0}; snmpStatus = SnmpStrToOid(pOidSnmpTrapOid, &snmpOidTrapOid); assert(snmpStatus != SNMPAPI_FAILURE); snmpStatus = SnmpStrToOid(pOidSnmpOidOfEntTrap, &snmpOidOfEntTrap); assert(snmpStatus != SNMPAPI_FAILURE); smiVALUE smiValueEntTrap = {0}; smiValueEntTrap.syntax = SNMP_SYNTAX_OID; smiValueEntTrap.value.oid = snmpOidOfEntTrap; snmpStatus = SnmpSetVb(snmpVarBindList, 0, &snmpOidTrapOid, &smiValueEntTrap); assert(snmpStatus != SNMPAPI_FAILURE); ///// //-- Now add Vb for 1.3.6.1.4.1.37086.1.1.0 ///// CHAR pOidSnmpTrapValueOid[] = "1.3.6.1.4.1.37086.1.1.0\0"; smiOID snmpOidTrapValueOid = {0}; snmpStatus = SnmpStrToOid(pOidSnmpTrapValueOid, &snmpOidTrapValueOid); assert(snmpStatus != SNMPAPI_FAILURE); smiVALUE smiValueTrapValue = {0}; smiValueTrapValue.syntax = SNMP_SYNTAX_INT; smiValueTrapValue.value.sNumber = 2; //failure; snmpStatus = SnmpSetVb(snmpVarBindList, 0, &snmpOidTrapValueOid, &smiValueTrapValue); assert(snmpStatus != SNMPAPI_FAILURE); ////////////////////////////////// // // Finished PDU creation; // ////////////////////////////////// //Attempt to send the message; snmpStatus = SnmpSendMsg(snmpSession, snmpSrcEntity, snmpDstEntity, snmpCtxt, snmpPdu); assert(snmpStatus != SNMPAPI_FAILURE); snmpStatus = SnmpFreePdu(snmpPdu); assert(snmpStatus != SNMPAPI_FAILURE); snmpStatus = SnmpFreeVbl(snmpVarBindList); assert(snmpStatus != SNMPAPI_FAILURE); snmpStatus = SnmpFreeDescriptor(SNMP_SYNTAX_OID, (smiLPOPAQUE)&snmpOidSysUpTime); assert(snmpStatus != SNMPAPI_FAILURE); snmpStatus = SnmpFreeDescriptor(SNMP_SYNTAX_OID, (smiLPOPAQUE)&snmpOidTrapOid); assert(snmpStatus != SNMPAPI_FAILURE); snmpStatus = SnmpFreeDescriptor(SNMP_SYNTAX_OID, (smiLPOPAQUE)&smiValueEntTrap.value.oid); assert(snmpStatus != SNMPAPI_FAILURE); snmpStatus = SnmpFreeEntity(snmpSrcEntity); assert(snmpStatus != SNMPAPI_FAILURE); snmpStatus = SnmpFreeEntity(snmpDstEntity); assert(snmpStatus != SNMPAPI_FAILURE);
I see that the trap gets on the wire and receives, but, unfortunately, the SNMP manager does not notify me of the trap. I have a good feeling that the problem is to form a trap on my side, not a problem with the manager (SNMPc manager)?
This is a custom MIB that I created using a dummy OID:
MARINA-MIB DEFINITIONS ::= BEGIN IMPORTS enterprises FROM RFC1155-SMI OBJECT-TYPE, NOTIFICATION-TYPE FROM RFC-1212 ; epilogue OBJECT IDENTIFIER ::= {enterprises 37086} marina OBJECT IDENTIFIER ::= {epilogue 1} marinaNotices OBJECT IDENTIFIER ::= {epilogue 2} marinaStatus OBJECT-TYPE SYNTAX INTEGER { ok (1), failure (2) } MAX-ACCESS accessible-for-notify STATUS current DESCRIPTION "The status of marina." ::= {marina 1} marinaStatusNotification NOTIFICATION-TYPE OBJECTS { marinaStatus } STATUS current DESCRIPTION "This variable notifies listeners of the status of marina." ::= {marinaNotices 1} END
In addition, I have a link to Wireshark dump trap capture.
SNMPc Manager allows me to send dummy traps with a small tool; however, these traps are SNMPv2, and WinSNMP uses v1, so it's hard for me to compare. Any suggestions would be highly appreciated.