I'm afraid I am not familiar with all of the APIs provided, and I am not
familiar with the one that uses a char array for integers. Can you please
be more specific about what you are doing, or provide some sample code?
Thanks,
Bill
On Wed, Jun 28, 2017 at 1:15 AM, Madhusudhana R <madhusudhan...@in.abb.com>
wrote:
> Hi Bill,
>
>
>
> I am glad for your reply. But need some more clarification.
>
>
>
> The integer value greater than UINT32_MAX is fed to netsnmp in the form
> of char array and also GAUGE itself defines any value greater than
> UINT32_MAX will remain at UINT32_MAX which means we can still provide a
> large value through char array.
>
>
>
> Point no. 2 and 4 in my queries below seems like a bug as they are not RFC
> complaint.
>
> i.e., 1. For GAUGE, negative value should remain at 0 which currently
> gives UINT32_MAX.
>
> 2. COUNTER64 exceeding UINT64_MAX should wrap around but currently
> it remains at UINT64_MAX and does not wrap.
>
>
>
> Please comment on these 2 points.
>
>
>
> Also I am still not able understand how to use BITSTRING type. I don’t
> know how the input value be given to netsnmp. Please help me on this.
>
>
>
> Regards,
>
> Madhu
>
> *From:* Bill Fenner [mailto:fen...@gmail.com]
> *Sent:* Tuesday, June 27, 2017 8:53 PM
> *To:* Madhusudhana R <madhusudhan...@in.abb.com>
> *Cc:* net-snmp-coders@lists.sourceforge.net
> *Subject:* Re: net-snmp5.7.3 non-compliance to RFC2578 on integer
> overflows for few trap types
>
>
>
> Madhu,
>
>
>
> How are you supplying the values to net-snmp? Many of these can be
> explained by net-snmp's internal representation (e.g., using "uint32" for
> non-negative types, so supplying -1 turns into UINT32_MAX inside C, without
> any explicit behavior on net-snmp's part. A lot of these limitations are up
> to the MIB module implementation to enforce, so the issues that you are
> seeing sound mostly like GIGO to me.
>
>
>
> Bill
>
>
>
>
>
> On Mon, Jun 19, 2017 at 4:09 AM, Madhusudhana R <madhusudhan...@in.abb.com>
> wrote:
>
> Hi Coders,
>
>
>
> I have below queries regarding trap types where I found little mismatch
> with *RFC2578* definition and *net-snmp5.7.3* behavior on boundary
> values.
>
> It will be of great help if someone can clarify on this.
>
>
>
> For convenience, below definitions are used.
>
> *INT32_MAX* 2147483647 <(214)%20748-3647>
>
> *NINT32_MAX* -2147483648 <(214)%20748-3648>
>
> *UINT32_MAX* 4294967295
>
>
>
> 1. INTEGER/INTEGER32
>
> Since RFC 2578 does not mention the behavior for integer overflow,
> net-snmp currently sticks to *NINT32_MAX* or *INT32_MAX *for integer
> overflows on both sides. Please clarify what should be the actual behavior?
>
>
>
> 2. GAUGE32
>
> RFC2578 says “The Gauge32 type represents a non-negative integer, which
> may increase or decrease, but shall never exceed a maximum value, nor fall
> below a minimum value. The maximum value cannot be greater than 2^32-1
> (4294967295 decimal), and the minimum value cannot be smaller than 0 “
>
>
>
> But net-snmp wraps around to 2^31 – 1 for any value less than 0. This does
> not conforms to RFC definition. Is this a bug with in net-snmp?
>
>
>
>
>
> 3. UNSIGNED32
>
> RFC2578 says the range lies between 0 to 2^32-1 but there is no
> information on overflows. Currently for overflow net-snmp gives *UINT32_MAX
> *but for input value= -1 it wraps around to *UINT32_MAX*.
>
> What should be the behavior for -1 and integer overflow for this trap type?
>
>
>
> 4. COUNTER
>
> RFC2578 says counter range is 0 to 2^32-1 and should wrap around for
> *UINT32_MAX
> + 1*. But for overflow netsnmp remains at *UINT32_MAX *which is not
> RFC2578 complaint. Looks like a bug. Please clarify.
>
> Also for value =-1, net-snmp gives *UINT32_MAX *which wraps around on
> other direction. Is this correct behavior?
>
>
>
> 5. TIMETICKS
>
> RFC2578 says the range is from 0 to 2^32 which is bit contradictory as it
> violates basic unsigned 32 bit integer range. Currently net-snmp stands
> at *UINT32_MAX *for 2^32 input value. Please clarify on this.
>
>
>
> 6. BITSTRING
>
> This is little bit important query as I am not aware of how it should be
> used.
>
> Please let me know how the BITSTRING should be used along with few example
> for better clarity.
>
>
>
> I am aware that my queries are little bit lengthy but it is my humble
> request if anybody can answer these questions it will be of great help for
> me.
>
>
>
> Thanks in advance.
>
>
>
> Regards,
>
> Madhu
>
>
>
>
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