[sr-dev] [kamailio/kamailio] 39chr long ipv6 issue ? (#2823)

[Tristan Mahé]

### Description

When receiving packets from an ipv6 full length, $si is empty
When  trying to listen to an ipv6 full length, kamailio refuses to start, trying to resolve the ipv6 instead of parsing it as an IPv6

There's no problem if the ipv6 in question is not maximum length.

### Troubleshooting

It seems like ip_addr2a() fails to properly parse a 39b length ipv6.

#### Reproduction

reproduced easily by placing calls from an ipv6 containing no 0 or trying to listen to an ipv6 full length.

#### Log Messages

Example packet and log associated:

Aug 13 01:06:42 test-1 /usr/sbin/kamailio[25890]: DEBUG: tls [tls_server.c:477]: tls_accept(): tls_accept: new connection from :52524 using TLSv1.0 ECDHE-RSA-AES256-SHA 256

=> The empty string before the port in that log should be a 39chr long ipv6

Aug 13 01:06:42 test-1 /usr/sbin/kamailio[25890]: WARNING: [INVITE|FROM|TO|/[]:57677=>2600:aaaa:aaaa:aaaa:aa:aa:aa:146:443/tls/22] 610:Empty source ip ?! 

=> That is a log generated from the config, which should be $si/$siz before the port 57677 and is empty. There's a test before that log line if ($si == "") { log }

#### SIP Traffic ( Anonymized )

INVITE sip:+TO at DOMAIN;transport=tls SIP/2.0
Via: SIP/2.0/TLS [2607:bbbb:bbbb:bbbb:bbbb:bbbb:bbbb:d5c1]:57677;branch=z9hG4bK.5SSv~9uQw;rport
From: "FROM" <sip:FROM at DOMAIN>;tag=8sei4EB40
To: "TO" <sip:+TO at DOMAIN>#015#012CSeq: 20 INVITE
Call-ID: mA5D5fcZdt#015#012Max-Forwards: 70
Route: <sip:DOMAIN:443;lr>
Supported: replaces, outbound
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO, UPDATE
Content-Type: application/sdp
Content-Length: 529
Contact: <sip:ua@[2607:bbbb:bbbb:bbbb:bbbb:bbbb:bbbb:d5c1]:57677;transport=tls>;+sip.instance="<urn:uuid:2a1a2139-8ed6-40bd-9352-d804d331a098>"
User-Agent: UA

v=0
o=#191026873 3487 1810 IN IP6 2607:bbbb:bbbb:bbbb:bbbb:bbbb:bbbb:d5c1
s=Talk
c=IN IP6 2607:bbbb:bbbb:bbbb:bbbb:bbbb:bbbb:d5c1
b=AS:380
t=0 0
a=rtcp-xr:rcvr-rtt=all:10000 stat-summary=loss,dup,jitt,TTL voip-metrics
m=audio 10712 RTP/AVP 124 117 115 0 101 96 97
a=rtpmap:124 opus/48000/2
a=fmtp:124 useinbandfec=1
a=rtpmap:117 SILK/16000
a=rtpmap:115 SILK/8000
a=rtpmap:101 telephone-event/48000
a=rtpmap:96 telephone-event/16000
a=rtpmap:97 telephone-event/8000
a=rtcp-fb:* trr-int 1000
a=rtcp-fb:* ccm tmmbr#015

### Possible Solutions

Patching src/core/ip_addr.h to change IP6_MAX_STR_SIZE from 39 to 40 fix the issue.

### Additional Information

version: kamailio 5.5.1 (x86_64/linux) ( commit 5ecf17bc2d308141534bdaf3a312704daf0db850 )

* **Operating System**:
* 
Debian 10.10

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https://github.com/kamailio/kamailio/issues/2823
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