Re: [protobuf] Re: validating protobuf messages

[Marc Gravell]

a zero tag is never valid in any protobuf data, although it wouldn't be
unheard of for folks to use a zero tag as a sentinel value to demark
multiple root messages. Protoc has some facilities to check the insides of
a message that might help you figure out how likely it is to be a match,
but it won't make a zero tag work.

On 10 Dec 2017 6:35 p.m., "Annu Bansal"  wrote:

> Hey Jeroen!
> Dis you get any method to check if a .pb file is generated from givem
> .proto file? Actually, I'm getting error while deserializing a .pb file,
> "The protocol message contained invalid tag(zero)." I was wondering if the
> two files are compatible.
> Thanks in advance.
>
> On Saturday, November 17, 2012 at 5:38:16 AM UTC+5:30, Jeroen Ooms wrote:
>>
>> I am using the RProtoBuf package, which interfaces to the c++ protobuf
>> library. I was wondering if there is any way of 'validating' a pb
>> message, in the sense that you can check if it actually is a valid
>> message for a given pb description. Currently, RProtoBuf is very
>> permissive and will basically accept anything. E.g the code below will
>> not throw an error, even though the file obviously is not a valid
>> tutorial.Person message:
>>
>> library(RProtoBuf)
>> read(tutorial.Person, "/etc/passwd")
>>
>> In practice, it is quite easy to introduce errors by accidentally reading
>> a message using the wrong description. It would be very helpful if there
>> was a way of preventing this kind of problems by some sort of validation.
>>
>> Is there support for this in the c++ library, or does protobuf basically
>> assume that the user/application has some other way of validating a message?
>>
>> --
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[protobuf] Re: validating protobuf messages

[Annu Bansal]

Hey Jeroen!
Dis you get any method to check if a .pb file is generated from givem 
.proto file? Actually, I'm getting error while deserializing a .pb file, 
"The protocol message contained invalid tag(zero)." I was wondering if the 
two files are compatible. 
Thanks in advance. 

On Saturday, November 17, 2012 at 5:38:16 AM UTC+5:30, Jeroen Ooms wrote:
>
> I am using the RProtoBuf package, which interfaces to the c++ protobuf 
> library. I was wondering if there is any way of 'validating' a pb 
> message, in the sense that you can check if it actually is a valid 
> message for a given pb description. Currently, RProtoBuf is very 
> permissive and will basically accept anything. E.g the code below will 
> not throw an error, even though the file obviously is not a valid 
> tutorial.Person message:
>
> library(RProtoBuf)
> read(tutorial.Person, "/etc/passwd")
>
> In practice, it is quite easy to introduce errors by accidentally reading 
> a message using the wrong description. It would be very helpful if there 
> was a way of preventing this kind of problems by some sort of validation.
>
> Is there support for this in the c++ library, or does protobuf basically 
> assume that the user/application has some other way of validating a message?
>
>

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[protobuf] Re: validating protobuf messages

[alex]

What's the definition of Validate? pb support optional fields, extensions 
, that means you can ignore unknown fields.
If some fields are necessary why not just set to required.  

On Saturday, November 17, 2012 8:08:16 AM UTC+8, Jeroen Ooms wrote:

 I am using the RProtoBuf package, which interfaces to the c++ protobuf 
 library. I was wondering if there is any way of 'validating' a pb 
 message, in the sense that you can check if it actually is a valid 
 message for a given pb description. Currently, RProtoBuf is very 
 permissive and will basically accept anything. E.g the code below will 
 not throw an error, even though the file obviously is not a valid 
 tutorial.Person message:

 library(RProtoBuf)
 read(tutorial.Person, /etc/passwd)

 In practice, it is quite easy to introduce errors by accidentally reading 
 a message using the wrong description. It would be very helpful if there 
 was a way of preventing this kind of problems by some sort of validation.

 Is there support for this in the c++ library, or does protobuf basically 
 assume that the user/application has some other way of validating a message?



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