Question

我需要测试基于snmp ++库的驱动程序代码。启动该驱动程序代码时，我打印了以下错误日志

“ Snmp陷阱寄存器错误：SNMP：响应PDU太大”

我正在使用SNMP ++ v3.2.25。我在网络上找到了一个SNMP仿真器，并将其发送到SNMP驱动程序。仍然打印出错误日志

“ Snmp陷阱寄存器错误：SNMP：响应PDU太大”。

我使用的SNMP模拟器是SnmpTrapGen V1.1。我在CMD命令中发送了

“ SnmpTrapGen.Exe -r：172.20.31.126 -p：161 -v：3-至：1.3.6.1.4.1.2011.2.15.2.4.3.3.0.1”

int ScsSnmp::init_snmp()
{
    Snmp::socket_startup();
    int status;
//  UdpAddress address(m_local_addr);
    m_snmp = new Snmp(status/*,address*/);
    if (( m_snmp == NULL) || ( status != SNMP_CLASS_SUCCESS))
    {
        printlog(LOGE_SNMP + m_link,"constructing Snmp Object failed ");
    }
    else
    {
        TargetCollection targets;
        OidCollection trapids;
        Oid trapoid = OidAlarmReportNotificationType;
        Oid heartoid = OidHeartbeatNotificationType;
        trapids += trapoid;
        trapids += heartoid;
        m_snmp->notify_set_listen_port(TRAP_LISTEN_PORT);
        ScsSnmp* myself = this;
        if ( status = m_snmp->notify_register( trapids, targets,my_trap_callback,myself) != SNMP_CLASS_SUCCESS)
        {
            printlog(LOGE_SNMP + m_link,"Snmp Trap Register Error : %s ",m_snmp->error_msg(status));
            return -1;
        }
        m_snmp->start_poll_thread(1000);    //1000ms
    }
    return 0;
}

void ScsSnmp::my_trap_callback (int reason, Snmp *session,Pdu &pdu, SnmpTarget &target, void *data)
{
    ScsSnmp* scssnmp = (ScsSnmp*)data;
    printlog(LOGE_SNMP + scssnmp->m_link,"start my_trap_callback");
    if ( reason == SNMP_CLASS_NOTIFICATION) 
    {
        Vb nextVb;
        GenAddress addr;
        target.get_address(addr);
        IpAddress from(addr);   
        Oid notify_id,ent;
        pdu.get_notify_id(notify_id);
        pdu.get_notify_enterprise(ent);
        if (notify_id == OidAlarmReportNotificationType)
        {
            memset(scssnmp->m_alarm_msg,0,128);
            memset(scssnmp->m_alarm_info.station,0,64);
            memset(scssnmp->m_alarm_info.subsystem,0,64);
            memset(scssnmp->m_alarm_info.devicetype,0,64);
            memset(scssnmp->m_alarm_info.device,0,64);
            memset(scssnmp->m_alarm_info.alarm_msg,0,128);
            for (int i = 0;i<pdu.get_vb_count();i++)
            {
                pdu.get_vb(nextVb, i);
                scssnmp->process_alarm_vb(nextVb);
            }
            memset(scssnmp->m_alarm_buf,0,512);
            memcpy(scssnmp->m_alarm_buf,&scssnmp->m_alarm_head,sizeof(alarm_head));
            memcpy(scssnmp->m_alarm_buf+sizeof(alarm_head),&scssnmp->m_alarm_info,sizeof(alarm_event_info));
            bool ret = scssnmp->m_ctrl_inf->addAlarm(scssnmp->m_alarm_buf,512);
            if (ret)
            {
                printlog(LOGE_SNMP + scssnmp->m_link,"add an event alarm success !");
            }
            else
            {
                printlog(LOGE_SNMP + scssnmp->m_link,"add an event alarm failed !");
            }

        }
        else if (notify_id == OidHeartbeatNotificationType)
        {
            printlog(LOGE_SNMP + scssnmp->m_link,"get a heartbeat !");
        }
        else
        {
            printlog(LOGE_SNMP + scssnmp->m_link,"Trap notify id is wrong,id=%s",notify_id.get_printable());
        }

    }
    else
    {
        printlog(LOGE_SNMP + scssnmp->m_link,"Trap Receive Error = ",session->error_msg(reason));
    }
    printlog(LOGE_SNMP + scssnmp->m_link,"end my_trap_callback");
}

我想通过仿真器发送SNMP陷阱，然后SNMP驱动程序接收数据并将其打印出来。简而言之，您要测试数据接口是否正常工作，但实际的接收接口会不断打印出错误日志

“ Snmp陷阱寄存器错误：SNMP：响应PDU太大”。

Answer 1

我们之前遇到过此问题，但它在snmp get响应中。这始终表明响应pdu大于65535字节。在端口162上捕获数据包将提供更清晰的验证。当我们在snmp get请求中遇到此问题时，我们减少了每个请求中发送的OID数量以解决此问题。

SNMP：响应PDU太大

1 个答案: