[SR-Users] Missing line in line.count transformation

Daniel Donoghue daniel.donoghue at freespee.com
Fri Oct 8 09:59:37 CEST 2021

Hi Daniel,

Thanks for the prompt response. 

Unfortunately, I am not in a position to be able to build kamailio from source at the moment, I noticed this issue on our production servers, using prebuilt binaries from apt repos but the code, at first glance, looks like it should work.

We are using a db to inject headers into outbound INVITEs and the db is filled using db tools running on Mac laptops; this means that I have been able to instruct our staff to ensure they press enter at the end of each line. It also means I had to do a fix in kamailio to convert mac’s line terminator, 0x0a, to a linux terminator, 0x0d, in order for the line counting and separation to work at all, which is why I made a suggestion for a new transformation that could do that for us… trim won’t work as the field is multi-line.


> On 7 Oct 2021, at 09:28, Daniel-Constantin Mierla <miconda at gmail.com> wrote:
> Hello,
> can you try with the patch from commit:
>   * https://github.com/kamailio/kamailio/commit/eaec3aaac227eb4a8c48f93b45565d15d4a0a991 <https://github.com/kamailio/kamailio/commit/eaec3aaac227eb4a8c48f93b45565d15d4a0a991>
> If works, then I will backport.
> The transformation is designed for working with lines in sip message that are terminated with CRLF, by searching for LF (\n) to cover the unix/dos. If you want to remove \r, there is a string trim transformation. I haven't seen lines finished only with \r flowing in the SIP world, but feel free to add new features in the code and propose pull requests via github project portal.
> Cheers,
> Daniel
> On 06.10.21 16:45, Daniel Donoghue wrote:
>> I think I’ve found an edge case with the string transformations for line.count:
>> In pv_trans.c, the following code does not appear to consider the last line if there are multiple lines and the last one is not terminated with \n.
>> case TR_LINE_COUNT:
>>     n=0;
>>     for(i=0; i<val->rs.len; i++)
>>         if(val->rs.s[i]=='\n')
>>             n++;
>>     if(n==0 && val->rs.len>0)
>>         n = 1;
>>     val->flags = PV_TYPE_INT|PV_VAL_INT|PV_VAL_STR;
>>     val->ri = n;
>>     val->rs.s = int2str(val->ri, &val->rs.len);
>>     break;
>> This means that my count is always one off unless I force a blank line at the end of my string.
>> Also, this code does not cater for cases where there is a different line terminator, such as CR or CRLF as is the case when the string comes from a Mac or windows system, respectively; it might be useful to have a transformation for doing that as I’ve had to hack it using s.replace with hexadecimal escape codes (\r and \n do not work) in a variable.
>> With every blessing,
>>>> Daniel Donoghue
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> -- 
> Daniel-Constantin Mierla -- www.asipto.com <http://www.asipto.com/>
> www.twitter.com/miconda <http://www.twitter.com/miconda> -- www.linkedin.com/in/miconda <http://www.linkedin.com/in/miconda>
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