21 Mar
2019
21 Mar
'19
10:06 p.m.
### Description
Providing Kamailio with a domain name longer than 72 chars causes Kamailio to crash with
an error in `fix_sock_str`. Looking at the code it appears that the `fix_sock_str`
function only assumes it is being passed IP addresses so the buffer length is configured
for the length of an IPv6 address represented as a string.
It appears to include the portion of the string representing the port as can be seen in
the two example config lines below.
#### Reproduction
The problem can be reproduced by adding the following line to the `kamailio.cfg` and
running `kamailio` with the `-c` config check option.
```
listen=tcp:eth0:5060 advertise
"example.example.example.example.example.example.example.example.exa":50
listen=tcp:eth0:5061 advertise
"example.example.example.example.example.example.example.example.e":5060
```
#### Debugging Data
N/A
#### Log Messages
```
0(100) ERROR: <core> [core/socket_info.c:376]: socketinfo2str(): Destionation
buffer too short
0(100) BUG: <core> [core/socket_info.c:443]: fix_sock_str(): fix_sock_str: Error in
socket to str
0(100) ERROR: <core> [core/socket_info.c:1841]: fix_all_socket_lists():
fix_socket_list tcp failed
failed to initialize list addresses
```
#### SIP Traffic
N/A
### Possible Solutions
Don't use listen addresses longer than 70 chars.
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
version: kamailio 5.2.2 (x86_64/linux)
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_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 6.3.0
```
* **Operating System**:
Debian container running on Arch Linux host.
```
Debian GNU/Linux 9 (stretch)
Linux 75dbf08c8303 5.0.3-arch1-1-ARCH #1 SMP PREEMPT Tue Mar 19 13:09:13 UTC 2019 x86_64
GNU/Linux
```
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