3

我创建了这个打印字符串值的代码，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：对于SNMPv2-SMI::mib-2.47.1.1.1.1.2.1012 = STRING: "GigabitEthernet Container"，它返回"GigabitEthernet Container";

但我尝试了一个整数值，但它不起作用：

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

示例：for SNMPv2-SMI::mib-2.17.2.11.0 = INTEGER: 1500, 我想返回1500，forIF-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, or INTEGER:12324, or STRING:Gi0/1（但我想解析这个结果并将其用于一些变量，没有数据类型，例如：在 vara中存储12132）。

谢谢！

4

3 回答 3

2

如果有人对此仍有疑问，我想出了一个不需要使用 net-snmp 5.7.3 进行解析的替代机制：

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;
}

这将使您的应用程序配置的其余部分保持原样，并且只吐出值，因此您不需要标记化。我缩写了循环，以便它专注于重要方面。

于 2015-08-18T18:44:23.740 回答
0

好吧，您总是可以直接操作数据...如您所述，计数器存储在 var->val.integer 中。但是LABEL:从 print_variable 的输出中删除所有前缀的更快方法是NETSNMP_DS_LIB_QUICK_PRINT像这样设置变量：

netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_QUICK_PRINT, 1);

这将删除“Counter32：”前缀。

于 2011-12-19T21:52:50.227 回答
0

我遇到了同样的问题，我用它来解决这个问题......

      unsigned long val64;
      val64 = vars->val.counter64->high;
      printf("value #%lu is a COUNTER32:\n", val64);
于 2016-05-20T19:08:22.973 回答