17 Jan
2018
17 Jan
'18
10:17 p.m.
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### Description
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Explain what you did, what you expected to happen, and what actually happened.
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When registering a soft client running on my Android phone (Grandstream Wave), Kamailio
crashes every time when the client registers. When setting the debug level below 3
Kamailio does not crash. I have only found the problem with this SIP client. Others are
working fine.
### Troubleshooting
#### Reproduction
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Set debug level greather than 2 and register the Grandstream Wave soft client from an
Android phone. Kamailio then crashes.
#### Log Messages
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just before crashing I get the following message:
0(7819) ERROR: <core> [core/udp_server.c:484]: udp_rcv_loop(): print buffer building
failed (10/16/4)
### Possible Solutions
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The problem seems to come from non-printable characters sent by the SIP client causing
Kamailio to crash.
Changing line 482 in udp_server.c from
l = snprintf(printbuf+j, 6, " %02X ", buf[i]);
to
l = snprintf(printbuf+j, 6, " %02X ", (unsigned char)buf[i]);
fixes the problem.
The compiler treats buf[i] as a signed integer and prepends 'FFFFFF' to the string
making it longer than 6 characters. Casting buf[i] as an unsigned char prevents Kamailio
from crashing.
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
version: kamailio 5.1.0 (x86_64/linux)
flags: STATS: Off, 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 with gcc 5.3.1
* **Operating System**:
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Ubuntu 16.04 (Xenial)
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