New subject: [kamailio/kamailio] TLS write buffer too small (#2240)

6 Mar 2020

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### Description

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We're trying to connect the same subscriber with Kamailio for load testing. Sometimes
it registers successfully but sometimes it throws the following error. 

### Troubleshooting

...
 From my understanding by checking the source code,
TLS_WR_MBUF_SZ is set as 65536 by default. This is the reason for "write buffer too
small". Can someone help me with how to change that?  
#### Reproduction

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I don't exactly know how to reproduce as some the clients pass and some fail. 

#### Debugging Data

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```
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#### Log Messages

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BUG: tls [tls_server.c:849]: tls_encode_f(): write buffer too small (65536/65536 bytes)
ERROR: websocket [ws_frame.c:300]: encode_and_send_ws_frame(): sending WebSocket frame
ERROR: websocket [ws_frame.c:800]: ws_frame_transmit(): sending message
NOTICE: <script>: WebSocket connection from a.b.c.d:1234 has closed
ERROR: registrar [reply.c:745]: reg_send_reply(): failed to send 200 OK
ERROR: <core> [core/tcp_main.c:3502]: handle_ser_child(): received CON_ERROR for
0x7f9472eec990 (id 100), refcnt 4, flags 0x4018
NOTICE: <script>: Error in saving location data
WARNING: sl [../../core/forward.h:173]: msg_send_buffer(): TCP/TLS connection for
WebSocket could not be found
ERROR: sl [sl_funcs.c:362]: sl_reply_error(): stateless error reply used: I'm terribly
sorry, server error occurred (1/SL)
WARNING: <core> [core/tcp_read.c:1716]: handle_io(): F_TCPCONN connection marked as
bad: 0x7f9472eec990 id 100 refcnt 1

#### SIP Traffic

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### Possible Solutions

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Need to increase the default tls write buffer size from 65536. I think it is set as 
"#define TLS_WR_MBUF_SZ	65536"

### Additional Information

  * **Kamailio Version** - output of `kamailio -v`

version: kamailio 5.0.8 (x86_64/linux) c35e69
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, 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: c35e69 
compiled on 05:04:45 Nov 25 2019 with gcc 4.8.5

* **Operating System**:

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Linux 3.10.0-957.21.3.el7.x86_64 #1 SMP Tue Jun 18 16:35:19 UTC 2019 x86_64 x86_64 x86_64
GNU/Linux

CentOS Linux release 7.7.1908 (Core)

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[kamailio/kamailio] Write Buffer too small (#2240)