Hello,
I have some legacy code that I worked on a bit, and I am able to get it to send
SNMPv1 traps. I want it to send SNMPv2c traps, and that's not happening (The
SNMP trap receiver gets the varbinds, community string, timestamps and
everything allright, but says "Invalid Notification Format"). I am wondering if
someone would know something about it and point me to the right direction.
The code is old (possibly UCD code, but it works with NET-SNMP version 5.4. I
am not including the entire code (I can't), but this is how it sends the traps:
/* Parse the snmpd.conf file for trapsink and other parameters */
/* Build the trap pdu */
netsnmp_pdu *pdu;
pdu = snmp_pdu_create(SNMP_MSG_TRAP);
in_addr_t * pdu_in_addr_t;
pdu_in_addr_t = (in_addr_t *)pdu->agent_addr;
*pdu_in_addr_t = get_myaddr();
/* Add the varbinds of various parameters to the pdu */
snmp_pdu_add_variable(pdu, <Oid>, <OidLength>, ASN_INTEGER, (u_char*)<integer
value>, sizeof(<integer value>);
snmp_pdu_add_variable(pdu, <Oid>, <OidLength>, ASN_OCTET_STRING,
(u_char*)<string value>, strlen(<string value>);
...
...
...
/* Put some protocol-related data in the trap */
pdu->enterprise_length = <trap oid length>;
pdu->trap_type = SNMP_TRAP_ENTERPRISESPECIFIC;
pdu->specific_type = <trap type>;
pdu->time = get_uptime();
/* SNMP session is initialized by using the parsed values of trapsink etc*/
snmpAgentSession* sessPtr;
sessPtr->version = SNMP_VERSION_2c;
sessPtr->peername = strdup(<peername from trapsink in snmpd.conf>);
sessPtr->remote_port = 162;
sessPtr = ::snmp_sess_open(sessPtr);
snmp_sess_send(sessPtr, pdu_to_send);
----- end of code ----
The two specific statements,
sessPtr->version = SNMP_VERSION_1; and
pdu = snmp_pdu_create(SNMP_MSG_TRAP);
are the ones that specify SNMPv1. When I change them to SNMP_VERSION_2c and
SNMP_MSG_TRAP2 respectively, I am able to send the traps, but the SNMP trap
receiver says "Invalid Notification Format".
The NET-SNMP FAQ reads that only the entry trapsink/trap2sink/trapinform in the
file snmpd.conf determines which kind of trap is sent out. Since I am parsing
that file myself, I don't see how snmp_sess_send() would know which trap
(v1/v2c) to send. [I tried that too, just in case. It didn't work]
Can someone please help?
Thanks,
Kapil
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