如何在net-snmp中打印整數和Counter32值

Question

我創建了這個打印字符串值的代碼，它工作正常：

 add_mibdir("."); 
 pdu = snmp_pdu_create(SNMP_MSG_GET);

 read_objid(if_index, id_oid, &id_len);
 snmp_add_null_var(pdu, id_oid, id_len);    
 status = snmp_synch_response(sess_handle,pdu,&response);

 int count=1;
 for(vars = response->variables; vars; vars = vars->next_variable) 
  {
    if (vars->type == ASN_OCTET_STR) 
    {
        char *sp = (char *)malloc(1 + vars->val_len);
        memcpy(sp, vars->val.string, vars->val_len);
        sp[vars->val_len] = '\0';
        printf("value #%d is a string: %s\n", count++, sp);
        printf("%s\n",vars->val.string);
        free(sp);
}

  }

示例：對於SNMPv2-SMI::mib-2.47.1.1.1.1.2.1012 = STRING: "GigabitEthernet Container" ，它返回"GigabitEthernet Container" ;

但我嘗試了一個整數值，它不起作用：

for(vars = response->variables; vars; vars = vars->next_variable)
    printf("%ld",(long int)vars->val.integer);//it returns large numbers;

示例：對於SNMPv2-SMI::mib-2.17.2.11.0 = INTEGER: 1500 ，我想返回1500並且對於IF-MIB::ifOutBroadcastPkts.10103 = Counter32: 14011112我想返回14011112

如果我使用：

for(vars = response->variables; vars; vars = vars->next_variable)
    print_variable(vars->name, vars->name_length, vars);

它返回Counter32:12132 ，或INTEGER:12324 ，或STRING:Gi0/1 INTEGER:12324 STRING:Gi0/1 （但我想解析這個結果並將其用於一些變量，沒有數據類型，例如：在var a中存儲12132 ）。

謝謝！

Answer 1

如果有人仍然有這個問題，我想出了一個不需要使用net-snmp 5.7.3進行解析的替代機制：

template<typename T>
static boost::shared_ptr< std::vector<T> > GetVector(std::string user_oid, struct snmp_session * snmp_session) {

    // Other Initialization ....

    char temp_buf[BUFSIZ];
    size_t temp_buf_len = BUFSIZ;
    bool orig_config_val_qp = netsnmp_ds_get_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_QUICK_PRINT);
    bool orig_config_val_bv = netsnmp_ds_get_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_PRINT_BARE_VALUE);

    // Enforce this for correct output in snprint_variable functions
    netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_QUICK_PRINT, 1);
    netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_PRINT_BARE_VALUE, 1);

    // oid conversion routines ...

    // Processing loop for response vars (similar to netsnmp/app/snmpbulkwalk.c) ...
    if (vars->type == ASN_OCTET_STR) 
    {
        temp_buf_len = BUFSIZ;
        snprint_variable(temp_buf, temp_buf_len, vars->name, vars->name_length, vars);
        result->push_back(boost::lexical_cast<T>(temp_buf));
    }
    // End Processing loop...

    // Restore configuration
    netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_QUICK_PRINT, orig_config_val_qp);
    netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_PRINT_BARE_VALUE, orig_config_val_bv);

    return result;
} 

這將保留應用程序配置的其余部分，並且只吐出值，因此您不需要進行標記化。 我縮寫了循環，因此它側重於重要方面。

Answer 2

我有同樣的問題，我得到它與...

      unsigned long val64;
      val64 = vars->val.counter64->high;
      printf("value #%lu is a COUNTER32:\n", val64);

Answer 3

好吧，你總是可以直接操作數據......如你所說，計數器存儲在var-> val.integer中。 但是，從print_variable的輸出中刪除所有LABEL:前綴的更快方法是設置NETSNMP_DS_LIB_QUICK_PRINT變量，如下所示：

netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_QUICK_PRINT, 1);

這將刪除“Counter32：”前綴。