SNMP - value has unknown type [0x44]

[ibmco.zabbix]

Hi,

I have one SNMP device which is working fine with native net-snmp get and walk command


As you can see, SNMP object type for this OID is OPAQUE and the actual data is hex-string which I found this pre-processing javascript to convert it ASCII

var out = "";
for (var i = 0, nums = value.split(" "); i < nums.length; i++) {
     out += String.fromCharCode(parseInt(nums[i], 16));
}
return out;

Which successfully convert 4E 6F 20 46 61 75 6C 74 ==> No Fault

But the problem is when I define this OID as an item, the item get error "SNMP - value has unknown type [0x44]"
I also have tested all "Type of information" (Character, Log, Text) for this item in the configuration panel, but nothing changed




I really appreciate it if someone can help me

Thanks,
Javad Gorji

[isaqueprofeta]

Can you please show the item configuration?

[ibmco.zabbix]

Here is item configuration:



SNMP Parameters are ok and i can get other OIDs also
As I said before, I have tested all "Type of information" (Character, Log, Text) for this item but no change!

[dimir]

Looks like pure OPAQUE value type is not supported by Zabbix currently.

Let's see Zabbix code. From the OPAQUE types we are handling

• ASN_OPAQUE_U64
• ASN_OPAQUE_I64
• ASN_OPAQUE_COUNTER64
• ASN_OPAQUE_FLOAT
• ASN_OPAQUE_DOUBLE

which we can see from here:

$ grep ASN_OPAQUE src/zabbix_server/poller/checks_snmp.c
else if (ASN_UINTEGER == var->type || ASN_COUNTER == var->type || ASN_OPAQUE_U64 == var->type ||
else if (ASN_COUNTER64 == var->type || ASN_OPAQUE_COUNTER64 == var->type)
else if (ASN_INTEGER == var->type || ASN_OPAQUE_I64 == var->type)
else if (ASN_OPAQUE_FLOAT == var->type)
else if (ASN_OPAQUE_DOUBLE == var->type)

net-snmp library supports few more OPAQUE value types:

$ egrep -r '^#define ASN_OPAQUE' /usr/include/net-snmp | grep -v LEN
/usr/include/net-snmp/library/asn1.h:#define ASN_OPAQUE_TAG1 (ASN_CONTEXT | ASN_EXTENSION_ID)
/usr/include/net-snmp/library/asn1.h:#define ASN_OPAQUE_TAG2 ((u_char)0x30)
/usr/include/net-snmp/library/asn1.h:#define ASN_OPAQUE_TAG2U ((u_char)0x2f) /* second octet of tag for union */
/usr/include/net-snmp/library/asn1.h:#define ASN_OPAQUE_COUNTER64 (ASN_OPAQUE_TAG2 + ASN_APP_COUNTER64)
/usr/include/net-snmp/library/asn1.h:#define ASN_OPAQUE_FLOAT (ASN_OPAQUE_TAG2 + ASN_APP_FLOAT)
/usr/include/net-snmp/library/asn1.h:#define ASN_OPAQUE_DOUBLE (ASN_OPAQUE_TAG2 + ASN_APP_DOUBLE)
/usr/include/net-snmp/library/asn1.h:#define ASN_OPAQUE_I64 (ASN_OPAQUE_TAG2 + ASN_APP_I64)
/usr/include/net-snmp/library/asn1.h:#define ASN_OPAQUE_U64 (ASN_OPAQUE_TAG2 + ASN_APP_U64)
/usr/include/net-snmp/library/snmp_impl.h:#define ASN_OPAQUE (ASN_APPLICATION | 4) /* changed so no conflict with other includes */

As you can see in Zabbix there is no mention of ASN_OPAQUE, which is your case (type 0x44 or, in decimal 68).

I think, since we have preprocessing, we could handle pure OPAQUE values as text and let users convert them if needed. Please create a ZBXNEXT here. I will add more information to it.

[ibmco.zabbix]

Thanks for your answer, I have created one issuein ZBXNEXT

https://support.zabbix.com/browse/ZBX-18351