[Kamailio-Devel] [SR-Dev] content length

[Klaus Darilion]

Andrei Pelinescu-Onciul schrieb:
> On Mar 30, 2009 at 16:06, Daniel-Constantin Mierla <miconda at gmail.com> wrote:
>> Hello,
>>
>> the data lumps system is critically affected if content-length is wrong 
>> for UDP. The anchor_lump() calls abort() in the case content-length is 
>> higher than actually body length.
> 
> It's true that anchor_lump() calls abort if the offset passed to it is
> outside the message, but I don't see where anchor_lump() is called with
> a value depending on Content-Length (at least in sip-router and ser).
> 
>> This can be prevented by called sanity 
>> module to check the content length, however, I consider being too 
>> drastic to have abort in such case, it would be better to return an 
>> error and let the sip router process other messages. Opinions?
>>
>> Checking sip-router sources, it faces same issue.
>>
>> Another option would be to correct the C-L value locally, but the right 
>> one is that phone vendor fixes its side.
> 
> It's fixed automatically in sip-router, if the destination protocol is
> tcp or tls.

How can this be fixed automatically? How will the proxy know when then 
body ends and the next message starts?

regards
klaus

PS: IMO the server should respond with "400 wrong content length" if 
accessing of the body is required and the length is wrong