From notifications@github.com Tue Apr 30 10:21:22 2024
From: Sven Uhlig <notifications@github.com>
To: sr-dev@lists.kamailio.org
Subject: [sr-dev] [kamailio/kamailio] possible memory corruption in sipcapture
 module (Issue #3835)
Date: Tue, 30 Apr 2024 03:21:11 -0700
Message-ID: <kamailio/kamailio/issues/3835@github.com>
MIME-Version: 1.0
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### Description

We send HEP3 data to the UDP listener in kamailio. In this HEP3 data, there a=
re SIP requests and replies. We want to route these SIP messages through `req=
uest_route` and `onreply_route`. For this, we use the SipCapture module with =
the following settings:

```
modparam("sipcapture", "db_url", DBURL)
modparam("sipcapture", "capture_on", 1)
modparam("sipcapture", "hep_capture_on", 1)
modparam("sipcapture", "insert_retries", 0)
modparam("sipcapture", "insert_retry_timeout", 0)

request_route {
	xlog("L_INFO", "Got new request ($ci) $rm: $si =3D> $Ri\n");
}

onreply_route {
	xlog("L_INFO", "Got new reply ($ci) $rm: $si =3D> $Ri - Reply Code $rs\n");
}
```

In the past (version kamailio 5.1.x - 5.4.x), this worked as expected. From t=
he logs:

```
 2(8) INFO: <script>: Got new request (7xkVDrAWegvcZl-ACaUb1HWHwiCYhAJR) INVI=
TE: 217.116.121.230 =3D> 172.20.21.4
 3(9) INFO: <script>: Got new reply (7xkVDrAWegvcZl-ACaUb1HWHwiCYhAJR) INVITE=
: 172.20.21.4 =3D> 217.116.121.230 - Reply Code 407
```

Starting with kamailio 5.5.x, some pseudo variables are broken. From the logs:

```
 1(7) INFO: <script>: Got new request (7xkVDrAWegvcZl-ACaUb1HWHwiCYhAJR) INVI=
TE: 217.116.121.230 =3D> 217.116.121
 2(8) INFO: <script>: Got new reply (7xkVDrAWegvcZl-ACaUb1HWHwiCYhAJR) INVITE=
: 172.20.21.4 =3D> 172.20.21.4 3(9) INFO: <script>: ...
```

As you can see, the `$Ri` in the request is wrong. It looks like the first th=
ree octets of the `$si` and the fourth octet is missing entirely.
And for the reply:

- The `$Ri` is the `$si`.
- The line is missing the static text `Reply Code`, the actual reply code.
- The next log is on the same line (the new line is gone). (In this case, we =
simply sent a third HEP3 message.)

To my untrained eye this looks like possible memory corruption.

### Troubleshooting

#### Reproduction

1. Set up a kamailio 5.8.1 using the attached [kamailio.cfg](https://github.c=
om/kamailio/kamailio/files/15161868/kamailio.cfg.zip)
    `/usr/sbin/kamailio -E -DD -dd -f "/etc/kamailio/kamailio.cfg"`
2. Send the HEP3 data using [heplify](https://github.com/sipcapture/heplify)
    `./heplify -t pcap -rf "sipcapture-bug.pcap" -hs localhost:9060 -e -eof-e=
xit`

#### Debugging Data

#### Log Messages

see above

#### SIP Traffic

see attached [sipcapture-bug.pcap](https://github.com/kamailio/kamailio/files=
/15161698/sipcapture-bug.zip)

### Possible Solutions

Use kamailio 5.4.x or earlier versions.

### Additional Information

When setting `nonsip_hook` =3D `1`, then the `$hep(...)` pseudo variables loo=
k fine. Unfortunately, we don't know how process the SIP messages after that =
point.

```
modparam("sipcapture", "nonsip_hook", 1)

...

event_route[sipcapture:request] {
	xlog("L_INFO", "version: $hep(version)\n");
	xlog("L_INFO", "src_ipv4: $hep(0x003)\n");
	xlog("L_INFO", "dst_ipv4: $hep(0x004)\n");
	xlog("L_INFO", "src_proto: $hep(0x007)\n");
	xlog("L_INFO", "dst_proto: $hep(0x008)\n");
	xlog("L_INFO", "proto: $hep(0x00b)\n");
}

```

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

```
version: kamailio 5.8.1 (x86_64/linux)=20
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, U=
SE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, MEM_JOIN_FREE, Q_MALLOC, F_MALLO=
C, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CA=
CHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLOCKLIST, HAVE_RESOLV_RES, TLS_PTH=
READ_MUTEX_SHARED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_SEND_BUFFER_SIZE 2=
62144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: =20
compiled with gcc 12.2.0
```

Also tested with same error: 5.5.x, 5.6.x, 5.7.x

* **Operating System**:

```
# lsb_release -a
No LSB modules are available.
Distributor ID:	Debian
Description:	Debian GNU/Linux 12 (bookworm)
Release:	12
Codename:	bookworm
```


--=20
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https://github.com/kamailio/kamailio/issues/3835
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