[SR-Users] TEXTOPS parser problem with binary data in MIME body

Hello, I have a problem with Kamailio version 3.2.4 (tested also with 3.3.5) regarding "binary data" in message bodies. According RFC3261 it is explicitly allowed using binary data within MIME bodies: RFC 3261 section 7.4.1: SIP messages MAY contain binary bodies or body parts. When no explicit charset parameter is provided by the sender, media subtypes of the "text" type are defined to have a default charset value of "UTF-8". However, the Kamailio function "Regular Expression Transformation" (re.subst), which is based on the transformation class (exported by the textops module) is causing problems in our customer system. In regular scenarios, Kamailio is receiving SIP INVITE messages with a MIME body, which is containing following parts: - application/sdp (standard conform) - application/x-q931 (Cisco proprietary with BINARY data!) - application/gtd (Cisco proprietary with ASCII strings) The content of the "x-q931" and "gtd" body parts is depending on (UUS1) data that were received on the ISDN line. Kamailio has to forward User-User specific information from the ISDN line to SIP user agents (in form of the "User-to-User" header field). The content of these UUS1 data may contain also byte values "00", which is legitimate. In general, Kamailio is in every INVITE message searching specific content in the last body (application/gtd) and copying this content to a config variable. As soon as the x-q931 body contains nul values (0x00 in binary format), the parser stops at this position and cannot parse the rest of the message. Therefore, I am missing the information that should be copied to the SIP header field, as the parser stops before the end of the message body! As long as the message body does not contain 0x00, it is working fine! My question is: - is this a bug in Kamailio parsing functions? - is this a design issue of Kamailio text parsers (as binary data are allowed acc. RFC3261) - does anybody know a solution for this problem? This "bug" is causing big troubles.... Thanks in advance, Klaus Feichtinger P.S. trace data (1)...(3) of my problem (1) exemplary content of the x-q931 body ======================Sending: Binary Message Body Sep 13 10:50:19: Content-Type: application/x-q931 08 01 B4 05 04 03 80 90 A2 18 01 89 1E 02 82 88 6C 05 B1 35 30 30 34 70 05 B1 35 30 30 31 7D 02 91 81 7E 18 04 1D 42 75 25 92 43 31 62 94 00 00 2C 68 20 64 00 62 F2 10 41 B9 D7 BD 0D 0A (2) SIP INVITE message (debugger view) =============================INVITE sip:115101@<ipv4>:5060 SIP/2.0 Via: SIP/2.0/UDP <ipv4>:5060;branch=z9hG4bK171164E From: <sip:1101015004@<ipv4>>;tag=29E16410-2541 To: <sip:115101@<ipv4>> Call-ID: 1DBCDACB-1B9911E3-8992FF70-D2BED293@<ipv4> Supported: timer,resource-priority,replaces,sdp-anat Min-SE: 90 CSeq: 101 INVITE Max-Forwards: 70 Contact: <sip:1101015004@<ipv4>:5060> Expires: 1800 P-Asserted-Identity: <sip:1101015004@<ipv4>> Content-Type: multipart/mixed;boundary=uniqueBoundary Mime-Version: 1.0 Content-Length: 820 --uniqueBoundary Content-Type: application/sdp Content-Disposition: session;handling=required v=0 o=CiscoSystemsSIP-GW-UserAgent 1770 5294 IN IP4 <ipv4> s=SIP Call c=IN IP4 <ipv4> t=0 0 m=audio 16384 RTP/AVP 8 0 c=IN IP4 <ipv4> a=rtpmap:8 PCMA/8000 a=rtpmap:0 PCMU/8000 --uniqueBoundary Content-Type: application/x-q931 Content-Disposition: signal;handling=optional Content-Length: 62 4" l15004p15001}~Bu%C1b..,h d.brA9W --uniqueBoundary Content-Type: application/gtd Content-Disposition: signal;handling=optional IAM, PRN,isdn*,,, USI,rate,c,s,c,1 USI,lay1,ulaw TMR,00 CPN,08,,1,5001 CGN,08,,1,,,5004 UUS,3,1d427525924331629400002c6820640062f21041b9d7bd CPC,09 FCI,,,,,,,y, GCI,185ef1291b9911e381d500270dff3fa0 --uniqueBoundary-- (3) config excerpt ============if (has_body("multipart/mixed")) { if (filter_body("application/sdp")) { remove_hf("Mime-Version"); remove_hf("Content-Type"); append_hf("Content-Type: application/sdp\r\n"); } else { xlog("L_WARN", " <route> message body part 'application/sdp' not found\n"); } $var(UUS)=$(rb{re.subst,/^(.*)UUS,.,([a-z0-9,]*)..[A-Z][A-Z][A-Z],(.*)/\2/s}); append_hf("User-to-User: $var(UUS)\r\n", "CSeq"); if !(subst_body('/Content-Disposition..session.handling=required....//s')) { xlog("L_WARN", " <route> substituting Content-Disposition FAILED!!! \n"); } msg_apply_changes(); if (search_body("a=[a-z]+:.+[\r\n]{4}$")) { #!ifdef WITH_XLOGDEBUG xlog("L_INFO", " <route> double CRLF at the end of the message body detected - is reduced to one now. \n"); #!endif $var(sdp) = $(rb{s.striptail,2}); set_body("$var(sdp)", "application/sdp"); } }