Hi all, I'm running into a little issue here. I've created a test application that utilizes both synchronous and asynchronous snmp get's.
My synchronous app works ok, however I cannot get my async app working. I
believe I have everything set up correctly. I'm launching my application
through gtest. Here is my code:
#include "SnmpTestApp.h"
#include <iostream>
#include <chrono>
#include <thread>
#include <atomic>
int asynch_response(int operation, struct snmp_session *sp, int reqid,
struct snmp_pdu *pdu, void *magic) {
std::cout << "Response received!" << std::endl;
return 1;
}
namespace testing {
namespace util {
SnmpTestApp::SnmpTestApp() {
}
SnmpTestApp::~SnmpTestApp() {
}
netsnmp_session SnmpTestApp::initialize() {
netsnmp_session session;
netsnmp_pdu *pdu;
netsnmp_pdu *response;
init_snmp("SnmpTestApp");
snmp_sess_init(&session);
session.peername = strdup("oster");
session.version = SNMP_VERSION_1;
session.community = (u_char*) strdup("public");
session.community_len = strlen("public");
return session;
}
void SnmpTestApp::sync(netsnmp_session session) {
netsnmp_session *ss;
netsnmp_pdu *pdu, *resp;
oid anOID[MAX_OID_LEN];
std::string oid = ".1.3.6.1.2.1.1.1.0";
size_t anOidLen = MAX_OID_LEN;
int status;
ss = snmp_open(&session);
if (!ss) {
snmp_sess_perror("ack", &session);
}
pdu = snmp_pdu_create(SNMP_MSG_GET);
if (read_objid(oid.c_str(), anOID, &anOidLen) == 0) {
snmp_sess_perror("read_objid", &session);
}
snmp_add_null_var(pdu, anOID, anOidLen);
status = snmp_synch_response(ss, pdu, &resp);
std::cout
<< "Status (Success: 1 Failure: 0): "
+ std::to_string(status == STAT_SUCCESS ? true : false)
<< std::endl;
std::cout
<< "Resp status Success: 1 Failure: 0 :"
+ std::to_string(
resp->errstat == SNMP_ERR_NOERROR ? true : false)
<< std::endl;
for (struct variable_list *vars = resp->variables; vars;
vars = vars->next_variable) {
print_variable(vars->name, vars->name_length, vars);
}
if (resp) {
snmp_free_pdu(resp);
}
snmp_close(ss);
}
void SnmpTestApp::async(netsnmp_session session) {
netsnmp_session *ss;
netsnmp_pdu *pdu;
oid anOID[MAX_OID_LEN];
std::string oid = ".1.3.6.1.2.1.1.1.0";
size_t anOidLen = MAX_OID_LEN;
int status;
session.callback = asynch_response;
//session.callback_magic = ss;
ss = snmp_open(&session);
if (!ss) {
snmp_sess_perror("ack", &session);
}
pdu = snmp_pdu_create(SNMP_MSG_GET);
if (read_objid(oid.c_str(), anOID, &anOidLen) == 0) {
snmp_sess_perror("read_objid", &session);
}
snmp_add_null_var(pdu, anOID, anOidLen);
if (snmp_async_send(ss, pdu, ss->callback, ss->callback_magic) == 0) {
std::cout << "Error sending async" << std::endl;
std::cout << std::to_string(session.s_snmp_errno) << std::endl;
std::cout << std::to_string(session.s_errno) << std::endl;
}
}
}
}
Is there anything I'm missing here? This app is in c++, so the callback is the
only method that is declared with extern "C". If this is incorrect please let
me know. I am not setting the void*, because I don't need to send any data to
the callback. As a starting point I have a debug point on the callback method
that doesn't get hit. The snmp_async_send does not show any errors being sent.
Thanks!
Corey
Corey Pentasuglia
Software Engineer
Sensor Systems
Saab Defense and Security USA LLC
Direct +1 315 445 5018
corey.pentasug...@saabusa.com<mailto:firstname.lastn...@saabusa.com>
5717 Enterprise Pkwy
Syracuse, Ny, 13057 USA
www.saabusa.com<http://www.saabusa.com/>
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