HI Andrei
thanks a lot!
Hi Ser Gurus:
How to parse msg stored in the tm correctly?e.g in the reply msg, we can get the corresponding request from tm:
msg = t->uas.request;The sip_msg_cloner seems copy only via/from/to/cseq/auth headers and parsed headers to the shm, right?
what if we want to parse the other headers,
e.g: parse_headers(msg, HDR_ROUTE_F, 0)<0)
By default all headers are parsed before creating the transaction, so you'll have all the headers in the shm copy. What you don't always have parsed is the content of a header (but that depends on the header type).
Oh I see, what we need is a parsed content of route header.
The parse_headers uses pkg_alloc, thus the parsed result is pkg_alloced and stored the tm structure, then it never get freed until tm is destoried ( but even in this case tm may call shm_free instead of pkg_free???? )
In general one calls parse_headers only on a copy of the message stored in tm (see fake_req()).
I see.
So how can we parsed the tm-stored msg and how to do it correctly?
If you could be more specific (what headers do you need and from where, e.g. failure route or a tm hook) it would help.
Here is the detailed case:
U1 --> p-cscf --> U2
U1 call U2, U2 reply with 183 and 200 OK.
The p-cscf handles the 183/200 reply in two different processes, we need to get original request's route header and its parsed content.
the old psudocode is like which cause memory leak/crash the sytem:
msg = t->uas.request; parse_headers(msg, HDR_ROUTE_F, 0) parse_rr(h);
according to your email, it seems should be something like :
msg = fake_req(t->uas.request); parse_headers(msg, HDR_ROUTE_F, 0) parse_rr(h); free_faked_req(msg);
since 183/200 are in different process and need the same parsed route header content, is there a way to copied the parsed content to shm to avoid duplicate parsing? Or is there a way to copy the parsed-header's content to shm before creating the transaction?
Kind regards
Min Wang