rtpengine: multipart content dropped when used read_sdp_pv

[sergey-safarov]

Description

When configured read_sdp_pv param for rtpengine module, then multipart content dropped in the body.
And the message cannot be parsed because

Content-Type: multipart/mixed;boundary=level3-boundary

But the message body does not have a separator.

Troubleshooting

Reproduction

To reproduce need to start Kamailio with config file

loadmodule "pv.so"
loadmodule "ctl.so"
loadmodule "corex.so"

loadmodule "sdpops.so"
loadmodule "rtpengine.so"
modparam("rtpengine", "rtpengine_sock", "udp:localhost:2223")
modparam("rtpengine", "read_sdp_pv", "$var(sdp_for_rtpengine)")

listen=udp:x.x.x.x:5060

request_route {
        $var(sdp_for_rtpengine) = $sdp(body);
        rtpengine_manage("ICE=force");
        forward();
}

And then send call using sipp script

<scenario name="Basic Sipstone UAC">
  <!-- In client mode (sipp placing calls), the Call-ID MUST be         -->
  <!-- generated by sipp. To do so, use [call_id] keyword.                -->
  <send retrans="500">
    <![CDATA[

      INVITE sip:[service]@example.com:[remote_port] SIP/2.0
      Via: SIP/2.0/[transport] [local_ip]:[local_port];branch=[branch]
      From: sipp <sip:sipp@[local_ip]:[local_port]>;tag=[call_number]
      To: sut <sip:[service]@[remote_ip]:[remote_port]>
      Call-ID: [call_id]
      CSeq: 1 INVITE
      Contact: sip:sipp@[local_ip]:[local_port]
      Max-Forwards: 70
      Subject: Performance Test
      Content-Type: multipart/mixed;boundary=level3-boundary
      Content-Length: [len]

      --level3-boundary
      Content-Type: application/sdp

      v=0
      o=user1 53655765 2353687637 IN IP[local_ip_type] [local_ip]
      s=-
      c=IN IP[media_ip_type] [media_ip]
      t=0 0
      m=audio [media_port] RTP/AVP 0
      a=rtpmap:0 PCMU/8000
      --level3-boundary
      Content-Type: application/isup;version=ansi
      Content-Disposition: session;handling=optional

      \x01\x18\x08\x10\x0a\x03\x06\x0d\x03\x80\x90\xa2\x07\x03\x10\x87\x36\x08\x14\x89
      \x0a\x07\x03\x13\x27\x97\x45\x28\x49\xc0\x08\xc0\x03\x10\x65\x41\x17\x88\x67\x3d
      \x01\x11\xc4\x03\x01\x01\x00\xea\x01\x01\xc7\x01\x20\x01\x0d\x0a
      --level3-boundary--

    ]]>
  </send>

If the read_sdp_pv param will be commented in the Kamailio config file, then the resulting message will be properly formatted and have the other multipart media.

[sergey-safarov]

@rfuchs could you look at this?