C++ Pdu::set_vb方法代码示例

void callback( int reason, Snmp *snmp, Pdu &pdu, SnmpTarget &target, void *cd)
{
    Vb nextVb;
    int pdu_error;

    cout << "reason: " << reason << endl
         << "msg: " << snmp->error_msg(reason) << endl;

    pdu_error = pdu.get_error_status();
    if (pdu_error) {
        cout << "Response contains error: "
             << snmp->error_msg(pdu_error)<< endl;
    }
    for (int i=0; i<pdu.get_vb_count(); i++)
    {
        pdu.get_vb(nextVb, i);

        cout << "Oid: " << nextVb.get_printable_oid() << endl
             << "Val: " <<  nextVb.get_printable_value() << endl;
    }

    if (pdu.get_type() == sNMP_PDU_INFORM) {
        cout << "pdu type: " << pdu.get_type() << endl;
        cout << "sending response to inform: " << endl;
        nextVb.set_value("This is the response.");
        pdu.set_vb(nextVb, 0);
        snmp->response(pdu, target);
    }
    cout << endl;
}

// callback : have received a Pdu from the target host with given read comm str
// this is really simplistic, but gives the general idea
int agent_impl::handle_get( Pdu &pdu, UdpTarget &target)
{
  ACE_TRACE("agent_impl::handle_get");
  OctetStr mgr_rd_str, agent_rd_str;
  target.get_read_community(mgr_rd_str); // requster's read community string
  tgt_.get_read_community(agent_rd_str); // this agent's read community string

  //  1. verify we have a valid read string else drop pdu (no response to caller)
  if (mgr_rd_str != agent_rd_str) {
     ACE_DEBUG((LM_DEBUG, "agent_impl::handle_get: invalid read community recvd\n"));
     return 0;
  }

  // 2. iterate over each varbind in the pdu, filling providing responses
  int fdone = 0;
  for (int i = 0; (i < pdu.get_vb_count()) && !fdone; i++) {
    Vb vb;
    pdu.get_vb(vb, i);
    if (get_response(vb)) { // set a value for the oid if we can else
      set_error_status(&pdu, SNMP_ERROR_NO_SUCH_NAME); // these ought to be member
      set_error_index(&pdu, i); // functions but are not yet...
      fdone++; // trigger flag to exit loop early
    }
    else // failed, return noSuch error
      pdu.set_vb(vb, i);
  }

  // 3. lastly, return the pkt to the caller
  return respond(pdu, target);
}

void MainWindow::async_callback(int reason, Snmp * /*snmp*/, Pdu &pdu,
				SnmpTarget &target)
{
  Vb nextVb;
  int pdu_error;
  QString prefix_text;
  QString notify_text;

  push_button_get_next->setEnabled(true);

  // What is the reason for this callback?
  if (reason == SNMP_CLASS_NOTIFICATION)
  {
    prefix_text = "Trap:    ";

    // get the notify id for traps
    Oid id;
    pdu.get_notify_id(id);
    notify_text = QString(" ID: %1 Type %2 -- ").arg(id.get_printable())
                  .arg(pdu.get_type());
  }
  else if (reason == SNMP_CLASS_ASYNC_RESPONSE)
  {
    prefix_text = "Response ";
  }
  else if (reason == SNMP_CLASS_TIMEOUT)
  {
    prefix_text = "Timeout  ";
  }
  else
  {
    QString err = QString("\nDid not receive async response/trap: (%1) %2\n")
                  .arg(reason).arg(Snmp::error_msg(reason));
    text_edit_output->append(err);
  }


  // Look at the error status of the Pdu
  pdu_error = pdu.get_error_status();
  if (pdu_error)
  {
    QString err = "\nResponse contains error:\n";
    err += Snmp::error_msg(pdu_error);
    text_edit_output->append(err);
    return;
  }

  // The Pdu must contain at least one Vb
  if (pdu.get_vb_count() == 0)
  {
    QString err = "\nPdu is empty\n";
    text_edit_output->append(err);
    return;
  }

  for (int i=0; i<pdu.get_vb_count(); i++)
  {
    // Get the Vb of the Pdu
    pdu.get_vb(nextVb, i);

    // Get Oid and value from the Vb and display it
    line_edit_obj_id->setText(nextVb.get_printable_oid());
    line_edit_value->setText(nextVb.get_printable_value());

    text_edit_output->append(prefix_text +
			     target.get_address().get_printable() +
			     " -- " +
			     notify_text +
			     line_edit_obj_id->text() + " = " +
			     line_edit_value->text() + "\n");
  }

  // If we received a inform pdu, we have to send a response
  if (pdu.get_type() == sNMP_PDU_INFORM)
  {
    text_edit_output->append("Sending response to inform.\n");

    // just change the value of the first vb
    pdu.get_vb(nextVb, 0);
    nextVb.set_value("This is the response.");
    pdu.set_vb(nextVb, 0);
    snmp->response(pdu, target);
  }
}

const list<pair<string,string> > & SnmpDG::GetMibTable(const snmp_version  version, const SnmpPara& spr, const string oid) const
{
	m_mib_table.clear();
	if(!m_inited_success)
	{
		return m_mib_table;
	}
	Snmp::socket_startup();  // Initialize socket subsystem

	UdpAddress address( spr.ip.c_str());
	Oid myoid(oid.c_str());      // default is sysDescr
	if( !myoid.valid())
	{// check validity of user oid
		return m_mib_table;
	}
	Pdu pdu;                           // construct a Pdu object
	Vb vb;                             // construct a Vb object(SNMP++ Variable Binding)
	vb.set_oid(myoid);//oid.c_str());
	pdu += vb;

	CTarget ctarget(address); 
	ctarget.set_version( version );
	ctarget.set_retry(spr.retry);           
	ctarget.set_timeout(spr.timeout); 
	ctarget.set_readcommunity(spr.community.c_str());
	SnmpTarget *target;
	target = &ctarget;
	int status;
	Snmp snmp(status, 0, false);
	if (status == SNMP_CLASS_SUCCESS)
	{
		DWORD dwStartTime_ttl = GetTickCount();
	   	DWORD dwStartTime = 0, dwEndTime = 0;
		while ( (status = snmp.get_next(pdu, *target)) == SNMP_CLASS_SUCCESS) //get_next命令是按列遍历oid
		{
			pdu.get_vb(vb, 0);
			Oid oid_tmp = vb.get_oid();//.get_printable_oid();该表项的oid
			string str_oid_tmp = oid_tmp.get_printable();
			if(oid_tmp.nCompare(myoid.len(), myoid) != 0)//判断是否已越界，如果是则结束循环
			{
				break;
			}

			bool bNew = true;
			string value_tmp = vb.get_printable_value();
                        for(std::list<pair<string,string> >::iterator item = m_mib_table.begin();
				item != m_mib_table.end();
				item++)
			{
				if(item->first == str_oid_tmp)//value_tmp)//去掉重复的oid
				{
					bNew = false;
					cout << "ip:" + spr.ip + ",repeat oid:" + str_oid_tmp;
					break;
				}
			}
			if(bNew)
			{
				dwStartTime = GetTickCount();
				m_mib_table.push_back(make_pair(str_oid_tmp,value_tmp));
				vb.set_oid(oid_tmp);
				vb.set_null();
				pdu.set_vb(vb,0);
			}
			else
			{
 			//	if ( GetTickCount() - dwStartTime > 10000 ) //10s
				//{
				//	cout << "Timeout because read repeat data " << endl;
					break;
				//}
			}
			if ( GetTickCount() - dwStartTime_ttl > 300000 )  //5min
			{
				cout << "Timeout because read operation " << endl;
				break;
			}
		}
	}
	else
	{
		cout << "SNMP++ Session Create Fail, " << snmp.error_msg(status) << "\n";
		SetLastError(status);
	}
	Snmp::socket_cleanup();  // Shut down socket subsystem
	return m_mib_table;
}