[OpenSIPS-Users] Support for https in async

[Liviu Chircu]

Hi Agalya!

> handle https queries

Regarding HTTPSqueries, could you try to build your rest_client with 
"libcurl-openssl-dev" instead of "libcurl-gnutls-dev"as a possible fix?

 > why is curl_multi_wait is not used

We don't want to block OpenSIPS after issuing an async query, but rather 
use the core async interface in order to quickly resume processing the 
next SIP message.

>What is the use of read_fds[] in rest_methods.c

Helps us find the needle in the haystack. If we find the needle (i.e. 
the new fd), we can throw it into the reactor and successfully exit. 
Otherwise, the connect operation is still going, and we need to wait a 
bit more.

>Why select() is not used ?

We don't want to do select() in the module code. The core reactor 
already does that for us. The module's only job in the async pattern is 
to produce file descriptors and feed them to the core async engine.

Regards,

Liviu Chircu
OpenSIPS Developer
http://www.opensips-solutions.com

On 08.11.2016 19:10, Ramachandran, Agalya (Contractor) wrote:
>
> Hi Liviu,
>
> Thank you for response. I have few questions, can you please clarify 
> me on these.
>
> ·Is there is a roadmap in future targeting async() to handle https 
> queries?
>
> ·In start_async_http_request(), why is curl_multi_wait is not used to 
> overcome 1024 fds limitation? and is there plan to use it in future?
>
> ·What is the use of read_fds[] in rest_methods.c and who uses it?
>
> ·Why select() is not used ?
>
> Regards,
>
> Agalya
>
> *From:*Liviu Chircu [mailto:liviu at opensips.org]
> *Sent:* Monday, October 31, 2016 12:27 PM
> *To:* Ramachandran, Agalya (Contractor) 
> <Agalya_Ramachandran at comcast.com>; OpenSIPS users mailling list 
> <users at lists.opensips.org>
> *Subject:* Re: Support for https in async
>
> Hi, Agalya!
>
> We have not done any development in that direction, and I assume it 
> won't work out of the box, as we need to instruct libcurl on where to 
> find the CA certificate before we can expect it to establish the TLS 
> connection. As an alternative, we could add the option of disabling 
> host/peer verifications like here [1]
>
> [1]: https://curl.haxx.se/libcurl/c/https.html 
> <https://curl.haxx.se/libcurl/c/https.html>
>
> Liviu Chircu
> OpenSIPS Developer
> http://www.opensips-solutions.com
>
> On 31.10.2016 16:41, Ramachandran, Agalya (Contractor) wrote:
>
>     Hi team,
>
>     Have you tried with *https://url*with async and does that work
>     without issue ?
>
>     When I try, resume_async_http_req is called, but crash is
>     occurring at libcurl library. So helpless to debug further.
>
>     async(rest_put(*"https://url" <https://url>, *"$fU,$tU,$ci ",
>     "application/json", "$var(body)", "$var(ct)", "$var(rcode)"),resume);
>
>     My question is crash occring only in my scenario or  OpenSIPS
>     doesn’t support async as https?
>
>     Here is my dump just in case for reference.
>
>     /#0 0x00007f567248da1e in Curl_raw_nequal () from /lib64/libcurl.so.4/
>
>     /#1 0x00007f567245bd0f in Curl_checkheaders () from
>     /lib64/libcurl.so.4/
>
>     /#2 0x00007f567245d1e5 in Curl_http () from /lib64/libcurl.so.4/
>
>     /#3 0x00007f567246db4b in Curl_do () from /lib64/libcurl.so.4/
>
>     /#4 0x00007f567247da1b in multi_runsingle () from /lib64/libcurl.so.4/
>
>     /#5 0x00007f567247e121 in curl_multi_perform () from
>     /lib64/libcurl.so.4/
>
>     #6 0x00007f56726b75ca in resume_async_http_req (fd=9,
>     msg=0x7f56739c0640 <faked_req.10404>, _param=0x7f56b3e354d0)
>
>         at rest_methods.c:380
>
>     #7 0x00007f56737771ff in t_resume_async (fd=0x7f56b3e26840,
>     param=0x7f567405c3e8) at async.c:125
>
>     #8 0x0000000000509975 in handle_io (fm=0x7f56b3e26840, idx=1,
>     event_type=1) at net/net_udp.c:267
>
>     #9 0x00000000005082b3 in io_wait_loop_epoll (h=0x806e00
>     <_worker_io>, t=1, repeat=0) at net/../io_wait_loop.h:221
>
>     #10 0x0000000000509c30 in udp_rcv_loop (si=0x7f56b3dd6808) at
>     net/net_udp.c:308
>
>     #11 0x000000000050a1c8 in udp_start_processes (chd_rank=0x7d30e8
>     <chd_rank.10706>, startup_done=0x0) at net/net_udp.c:372
>
>     #12 0x0000000000492304 in main_loop () at main.c:671
>
>     #13 0x0000000000494d8f in main (argc=7, argv=0x7fff38a979f8) at
>     main.c:1261
>
>     Regards,
>
>     Agalya
>
>     *From:* Ramachandran, Agalya (Contractor)
>     *Sent:* Thursday, October 27, 2016 4:24 PM
>     *To:* users at lists.opensips.org <mailto:users at lists.opensips.org>;
>     'Liviu Chircu' <liviu at opensips.org> <mailto:liviu at opensips.org>
>     *Subject:* Support for https in async
>
>     Hi team,
>
>     Just a quick question.. Does async(), method supports https request?
>
>     When I try to use https, resume_async_http_req is called, but I
>     never got the response and rather OpenSIPS crashed at libcurl.
>
>     Regards,
>     Agalya
>

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