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You can delete next line and everything above before submitting (it is a comment). --> ### Description <!-- Explain what you did, what you expected to happen, and what actually happened. --> When processing a multipart INVITE using the rtpengine module. The rtpengine_offer configuration function (called with default arguments) is stripping all bodies except the application/sdp MIME type body. ### Troubleshooting #### Reproduction <!-- If the issue can be reproduced, describe how it can be done. --> A client is sending an INVITE through a kamailio proxy paired with a rtpengine. ``` Client Proxy Server x INVITE (SDP) x x x x qqqqqqqqqqqqqqqqqqqqqqqqqq> x x x x 100 Trying x x x x <qqqqqqqqqqqqqqqqqqqqqqqqqq x x x x x x INVITE (SDP) x x x x qqqqqqqqqqqqqqqqqqqqqqqqqq> x x x x 100 Trying x x x x <qqqqqqqqqqqqqqqqqqqqqqqqqq x x x x x x x x x x x x x x x x x x x x x x x x x x x x 200 OK (SDP) x x x x <qqqqqqqqqqqqqqqqqqqqqqqqqq x x 200 OK (SDP) x x x x <qqqqqqqqqqqqqqqqqqqqqqqqqq x x x ``` The INVITE contains a application/sdp body and one or several other bodies of different MIME types. When the INVITE is going out of the proxy, all other bodies except the application/sdp MIME are filtered out. While The INVITE "Content-Type" header is still fixed to : `Content-Type: multipart/mixed;boundary="[boundary value]"` RTP Engine receives only the SDP body on its socket and is rewritting well the RTP ports. #### Debugging Data <!-- If you got a core dump, use gdb to extract troubleshooting data - full backtrace, local variables and the list of the code at the issue location. gdb /path/to/kamailio /path/to/corefile bt full info locals list If you are familiar with gdb, feel free to attach more of what you consider to be relevant. --> ``` (paste your debugging data here) ``` #### Log Messages <!-- Check the syslog file and if there are relevant log messages printed by Kamailio, add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). --> ``` (paste your log messages here) ``` #### SIP Traffic <!-- If the issue is exposed by processing specific SIP messages, grab them with ngrep or save in a pcap file, then add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). --> ``` (paste your sip traffic here) ``` ### Possible Solutions <!-- If you found a solution or workaround for the issue, describe it. Ideally, provide a pull request with a fix. --> This issue has been introduced by the following commit : 36cb753441a78bd13ded119cd468f32623f09fbf. rtpengine.c : ``` diff @@ -3328,6 +3328,7 @@ rtpengine_offer_answer(struct sip_msg *msg, const char *flags, int op, int more) str body, newbody; struct lump *anchor; pv_value_t pv_val; + str cur_body = {0, 0}; dict = rtpp_function_call_ok(&bencbuf, msg, op, flags, &body); if (!dict) @@ -3357,7 +3358,12 @@ rtpengine_offer_answer(struct sip_msg *msg, const char *flags, int op, int more) pkg_free(newbody.s); } else { - anchor = del_lump(msg, body.s - msg->buf, body.len, 0); + /* get the body from the message as body ptr may have changed */ + cur_body.len = 0; + cur_body.s = get_body(msg); + cur_body.len = msg->buf + msg->len - cur_body.s; + + anchor = del_lump(msg, cur_body.s - msg->buf, cur_body.len, 0); if (!anchor) { LM_ERR("del_lump failed\n"); goto error_free; ``` If this commit is removed, the previous behavior is restored. This commit fixes a segfault: "rtpengine: fixed segfault when using read_sdp_pv", so it appears to me that this may be useful. For, now I am not seeing why this is happening. ### Additional Information * **Kamailio Version** - output of `kamailio -v` seen on: ``` version: kamailio 5.1.0 (x86_64/linux) flags: STATS: Off, EXTRA_DEBUG, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: unknown compiled on 15:29:43 Feb 8 2018 with gcc 4.8.4 ``` but I think that the same behavior will be seen on master. * **Operating System**: <!-- Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu 16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...; Kernel details (output of `uname -a`) --> ``` (paste your output here) ``` -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/kamailio/kamailio/issues/1434