Hi,
following my code used in order to send the same V3 trap to multiple hosts.
Now, this is en example scenario: Host #1 with wrong V3 credentials Host #2
with correct V3 credentials
V3 trap not sent to host #1 => OK because I've wrong credentials V3 trap
*not* sent to host #2 => NOK because I've correct credentials
Why? It seems SNMP session related to host #2 "inherits" something from
host #1 session.
Thanks for your help.
void MyClass::sendV3Trap(string p_notificationDescriptor, const
vector<GcpfTrapVariable>& p_trapVariables)
{
// SNMP system OID of trap
oid objid_snmptrap[]= { 1, 3, 6, 1, 6, 3, 1, 1, 4, 1, 0 };
// for each configured remote hosts
for (...)
{
netsnmp_session session;
char* p_posix = strdup("POSIXLY_CORRECT=1");
putenv(p_posix);
// inits the SNMP session
snmp_sess_init(&session);
// SNMP version
session.version = SNMP_VERSION_3;
// manages the security name
session.securityName= "snmpuser";
session.securityNameLen= strlen("snmpuser");
// security level is Auth-Priv
session.securityLevel= SNMP_SEC_LEVEL_AUTHPRIV;
// manages auth protocol (for example MD5)
session.securityAuthProto= usmHMACMD5AuthProtocol;
session.securityAuthProtoLen= USM_AUTH_PROTO_MD5_LEN;
// manages priv protocol (for example DES)
session.securityPrivProto= usmDESPrivProtocol;
session.securityPrivProtoLen= USM_PRIV_PROTO_DES_LEN;
// manages auth password
char* Apsz= "authPassword";
// manages priv password
char* Xpsz= "privPassword";
//
init_snmp("gcpf_trap_sender");
// makes master key from pass phrases
session.securityAuthKeyLen= USM_AUTH_KU_LEN;
if (SNMPERR_SUCCESS!= generate_Ku(session.securityAuthProto,
session.securityAuthProtoLen, (u_char*)Apsz, strlen(Apsz),
session.securityAuthKey, &session.securityAuthKeyLen))
printf("Error generating a key (Ku) from the supplied
authentication pass phrase");
session.securityPrivKeyLen= USM_PRIV_KU_LEN;
if (SNMPERR_SUCCESS!= generate_Ku(session.securityAuthProto,
session.securityAuthProtoLen, (u_char*)Xpsz, strlen(Xpsz),
session.securityPrivKey, &session.securityPrivKeyLen))
printf("Error generating a key (Ku) from the supplied
privacy pass phrase");
// peer name (IP address and port of the remote host)
session.peername= ...;
// socket and callbacks
SOCK_STARTUP;
session.callback = NULL;
session.callback_magic = NULL;
// setup the local engineID which may be for either or both of the
// contextEngineID and/or the securityEngineID
setup_engineID(NULL, NULL);
// use our internal engineID as the context
session.contextEngineID=
snmpv3_generate_engineID(&session.contextEngineIDLen);
// sets the engine ID
size_t ebuf_len= 32;
size_t eout_len= 0;
u_char* ebuf= (u_char*)malloc(ebuf_len);
char* optarg= "0x8000000001";
if (!snmp_hex_to_binary(&ebuf, &ebuf_len, &eout_len, 1, optarg))
printf("Bad engine ID value specified in the config file");
if ((eout_len < 5) || (eout_len > 32))
printf("Invalid engine ID value specified in the config file");
session.securityEngineID = ebuf;
session.securityEngineIDLen = eout_len;
//
session.engineBoots= 1;
//
session.engineTime= get_uptime();
netsnmp_session* ss= snmp_add(&session,
netsnmp_transport_open_client("snmptrap", session.peername), NULL,
NULL);
if (NULL== ss)
printf("Error snmp_add");
else
{
netsnmp_pdu* pdu= snmp_pdu_create(SNMP_MSG_TRAP2);
pdu->trap_type = SNMP_TRAP_ENTERPRISESPECIFIC;
if (!pdu)
printf("Failed to create notification PDU");
else
{
// for each variable of the trap
for (...)
snmp_add_var(pdu, it->m_trapVariableOid,
sizeof(it->m_trapVariableOid) / sizeof(oid), it->m_trapVariableType,
it->m_trapVariableValue.c_str());
snmp_add_var(pdu, objid_snmptrap,
sizeof(objid_snmptrap) / sizeof(oid), 'o',
p_notificationDescriptor.c_str());
send_trap_to_sess (ss, pdu);
snmp_free_pdu(pdu);
snmp_close(ss);
}
}
} // end for}
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