[Serusers] REGISTER with negative Content-Length

[Hendrik Scholz]

Hi!

I've handcrafted a REGISTER that contains a negative Content-Length:

from ngrep:
#
U x.x.x.x:5060 -> y.y.y.y:5060
REGISTER sip:123 at mydomain.net SIP/2.0.
Via: SIP/2.0/UDP x.x.x.x:5060.
From: 123 <sip:123 at mydomain.net:5060>;tag=33.
To: 123 <sip:123 at mydomain.net:5060>.
Call-ID: 33-11277 at x.x.x.x.
CSeq: 1 REGISTER.
Contact: sip:123 at x.x.x.x:5060.
Content-Length: -1000.
Expires: 300.

syslog content:

Aug 31 11:04:48 xxx ser[3866]: ERROR:parse_content_length: parse error
near char [45][-]
Aug 31 11:04:48 xxx ser[3866]: ERROR:get_hdr_field: bad content_length
header
Aug 31 11:04:48 xxx ser[3866]: ERROR: build_res_buf_from_sip_req: alas,
parse_headers failed
Aug 31 11:04:48 xxx ser[3866]: pre_auth(): Error while sending 400 reply

So the parser works fine but I cannot send an error message to
prevent retransmissions from the UAC.
The same is true for alphanumeric characters within the Content-Length:
value.

To test the Content-Length stuff even more I've set the Content-Length
within the REGISTER to 1000 which yields a 'ERROR: t_newtran: EoH not
parsed' warning but SER still sends the 407 that I was hoping for.

Now the question is if there is any way to add something like a
failure_route block to allow logging and sending a generic or customized
4xx/5xx error message to prevent retransmissions.

Btw: My config is far from a stock one but it all comes down to a
standard REGISTER with radius_www_authorize() in the REGISTER block.

Any help appreciated,
  Hendrik

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