29 Sep
2020
29 Sep
'20
12:57 p.m.
### Description
[rfc5952#section-4.3](https://tools.ietf.org/html/rfc5952#section-4.3)
**4.3. Lowercase**
The characters
"a", "b", "c", "d", "e", and
"f" in an IPv6 address
MUST be represented in lowercase.
### Expected behavior
According to RFC
#### Actual observed behavior
IPv6 addresses the upper case.
#### Debugging Data
None
#### Log Messages
None
#### SIP Traffic
```
OPTIONS sip:proxy.example.com;transport=tcp SIP/2.0
Via: SIP/2.0/TCP
[2600:1F1C:257:8706:C6BA:A565:1E85:B29E];branch=z9hG4bKa3e9.cac3f2f1000000000000000000000000.0
To: <sip:proxy.example.com;transport=tcp>
From: <sip:proxy@example.com>;tag=897804205b5fb4c6a22d7dcb9cb796fb-733ff025
CSeq: 10 OPTIONS
Call-ID: 29ea7b443fbf87f8-2892(a)172.22.6.119
Max-Forwards: 70
Content-Length: 0
User-Agent: Kamailio
```
### Possible Solutions
Not known
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
[centos@ip-172-22-6-226 ~]$ kamailio -v
version: kamailio 5.5.0-dev2 (x86_64/linux) 60f04b
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST,
DNS_IP_HACK, 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, TLS_PTHREAD_MUTEX_SHARED
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: 60f04b
compiled on 04:01:18 Sep 26 2020 with gcc 8.3.1
```
* **Operating System**:
```
[centos@ip-172-22-6-226 ~]$ cat /etc/os-release
NAME="CentOS Linux"
VERSION="8 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="8"
PLATFORM_ID="platform:el8"
PRETTY_NAME="CentOS Linux 8 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:8"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"
CENTOS_MANTISBT_PROJECT="CentOS-8"
CENTOS_MANTISBT_PROJECT_VERSION="8"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="8"
```
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30 Sep
30 Sep
3:54 a.m.
I added a new core parameter to enable switching to lowercase, see:
* https://www.kamailio.org/wiki/cookbooks/devel/core#ipv6_hex_style
However, apart of seeing the listen sockets show now lowercase hex digits if the core
param is set accordingly, I haven't done much testing. If you find issues, open new
cases in tracker to address them.
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3:54 a.m.
Closed #2488.
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4:49 a.m.
How about add `ipv6_hex_style = "a"` into default kamailio config?
Can I do it?
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6:16 a.m.
It is not yet time for such change, because it is a new addition and not well tested.
Moreover, the RFC is about recommendations, is not a real bug. Keep it in mind for changes
to be done before next major release, at that moment it can be better to just set the
default value in the code.
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6:41 a.m.
I have tested this update.
The current `Kamailio` behavior as expected.
```
INVITE sip:+19163120077@example.com SIP/2.0
Record-Route:
<sip:[2600:1f18:40ed:da06:ae55:4e63:67e5:e60a];transport=tcp;r2=on;lr=on;ftag=daFBsTkhF>
Record-Route: <sip:3.236.25.4;transport=tcp;r2=on;lr=on;ftag=daFBsTkhF>
Via: SIP/2.0/TCP
[2600:1f18:40ed:da06:ae55:4e63:67e5:e60a];branch=z9hG4bK155b.223c92df834dbcc962418d2f49797a80.0;i=89
Via: SIP/2.0/TCP
192.168.2.10:41322;received=91.224.133.8;branch=z9hG4bK.YxTlXA4AD;rport=41322
From: "test" <sip:6157778900@example.com>;tag=daFBsTkhF
To: sip:+19163120077@example.com
```
As I understand not chance to backport to `5.4`, `5.3` and `5.2` branches.
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6:55 a.m.
It is not a fix to a bug, but an implementation of an rfc with recommendations, thus it
does not meet backporting policy. After all, how it was so far worked since 2001 when ipv6
support was added to core.
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1556
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1557
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6 comments
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participants (2)
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Daniel-Constantin Mierla -
sergey-safarov