Hi,
I am using net-snmp version 5.5. I am trying to send traps using the net-snmp
library api's, but I am unsuccessful. But sending the trap using snmptrap
command is successful with the same credentials. Below are the steps I have
followed.
1. service snmptrapd stop
2. service snmpd stop
3. added the following lines to /etc/snmp/snmpd.conf
# VACM configuration entries
rwuser wes
# USM configuration entries
createUser wes MD5 setup_passphrase DES
4. service snmpd start
An entry for user wes was created in the /var/-net-snmp/snmpd.conf of the
following form :
usmUser 1 3 0x80001f8880654ceb30a484dc4c 0x77657300 0x77657300 NULL
.1.3.6.1.6.3.10.1.1.2 0x12317a58c0ccd9e67374456e228cdb3c .1.3.6.1.6.3.10.1.2.2
0x12317a58c0ccd9e67374456e228cdb3c ""
5. I added the following entry to /var/net-snmp/snmptrapd.conf
createuser -e 0x80001f8880654ceb30a484dc4c wes MD5 setup_passphrase DES
6. /usr/sbin/snmptrapd -f -Lf /tmp/trapLogFile -d
7. snmptrap -v 3 -n "" -a MD5 -A setup_passphrase -l authNoPriv -u wes -e
0x80001f8880654ceb30a484dc4c localhost 0 coldStart.0
Trap is received.
8. I wrote the following code to send the trap using net-snmp api's :
netsnmp_session session, *ss;
netsnmp_pdu *pdu;
oid anOID[MAX_OID_LEN];
size_t anOID_len;
init_snmp("snmpdemoapp");
snmp_sess_init( &session ); /* set up defaults */
session.peername = strdup("mella.ind.hp.com:162");
session.version=SNMP_VERSION_3;
/* set the SNMPv3 user name */
session.securityName = strdup("wes");
session.securityNameLen = strlen(session.securityName);
session.securityEngineIDLen = strlen("0x80001f8880654ceb30a484dc4c");
session.securityEngineID = (u_char*)malloc(session.securityEngineIDLen);
memcpy(session.securityEngineID,"0x80001f8880654ceb30a484dc4c",session.securityEngineIDLen);
session.securityLevel = SNMP_SEC_LEVEL_AUTHNOPRIV;
/* set the authentication method to MD5 */
session.securityAuthProto = usmHMACMD5AuthProtocol;
session.securityAuthProtoLen = sizeof(usmHMACMD5AuthProtocol)/sizeof(oid);
session.securityAuthKeyLen = USM_AUTH_KU_LEN;
/* set the authentication key to a MD5 hashed version of our
passphrase "The Net-SNMP Demo Password" (which must be at least 8
characters long) */
if (generate_Ku(session.securityAuthProto,
session.securityAuthProtoLen,
(u_char *) our_v3_passphrase, strlen(our_v3_passphrase),
session.securityAuthKey,
&session.securityAuthKeyLen) != SNMPERR_SUCCESS) {
snmp_perror(argv[0]);
snmp_log(LOG_ERR,
"Error generating Ku from authentication pass phrase. \n");
exit(1);
}
ss = snmp_open(&session); /* establish the session */
if (!ss) {
snmp_sess_perror("ack", &session);
SOCK_CLEANUP;
/*
* Create the PDU for the data for our request.
* 1) We're going to TRAP the system.sysDescr.0 node.
*/
pdu = snmp_pdu_create(SNMP_MSG_TRAP2);
anOID_len = MAX_OID_LEN;
if (!snmp_parse_oid(".1.3.6.1.2.1.1.1.0", anOID, &anOID_len)) {
snmp_perror(".1.3.6.1.2.1.1.1.0");
SOCK_CLEANUP;
exit(1);
}
status = snmp_send(ss, pdu);
9. I get the following error in the logfile :
snmp_parse: snmp_parse: Parsed SNMPv3 message (secName:wes,
secLevel:authNoPriv): USM unknown security name (no such user exists)
Parsed SNMPv3 message (secName:wes, secLevel:authNoPriv): USM unknown security
name (no such user exists)
10. I debugged net-snmp I saw that the engine id stored in snmpusm.c does not
match with the request engineid.The comparison of the engine id at line
snmpusm.c:3011 fails. Dump from gdb as below :
(gdb) p engineID
$11 = (u_char *) 0x9f765b8 "0x80001f8880654ceb30a484dc4c"
(gdb) p engineIDLen
$12 = 28
(gdb) p ptr->engineIDLen
$13 = 13
(gdb) p ptr->engineID
$14 = (u_char *) 0x9f8b698 "\200"
Am I missing something. Can somebody help me.
Rgds,
Sahana
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