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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.
It seems like ip_addr2a() fails to properly parse a 39b length ipv6.
reproduced easily by placing calls from an ipv6 containing no 0 or trying to listen to an ipv6 full length.
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 }
INVITE sip:+TO@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@DOMAIN;tag=8sei4EB40
To: "TO" sip:+TO@DOMAIN#15#012CSeq: 20 INVITE
Call-ID: mA5D5fcZdt#15#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#15
Patching src/core/ip_addr.h to change IP6_MAX_STR_SIZE from 39 to 40 fix the issue.
version: kamailio 5.5.1 (x86_64/linux) ( commit 5ecf17b )
Debian 10.10
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