[Pidgin] #13157: Problems with Bonjour and IPv6 on 2.7.9

[Pidgin]

#13157: Problems with Bonjour and IPv6  on 2.7.9
----------------------------+-----------------------------------------------
 Reporter:  pottersys       |        Owner:  datallah
     Type:  defect          |       Status:  new     
Milestone:                  |    Component:  Bonjour 
  Version:  2.7.9           |   Resolution:          
 Keywords:  dnsquery, ipv6  |  
----------------------------+-----------------------------------------------

Comment(by pjdelport):

 Replying to [comment:3 tux]:
 > @pjdelport: Are those other hosts running Ubuntu 10.10 + pidgin 2.7.9,
 too?

 Probably Ubuntu 10.10 and Pidgin 2.7.3, or Ubuntu 10.04 and its version
 (2.6.6?). However, i suspect the remote version does not really influence
 this particular bug much: the failure happens during the local Pidgin's
 dnsquery, before it even tries to connect.


 > I've also changed my /etc/nsswitch.conf from "hosts: files dns" to
 "hosts: files mdns_minimal [NOTFOUND=return] dns mdns", don't know if that
 might help...

 I haven't poked at this yet, but i'll try and report back.


 > Actually, it sounds a little weird that a dns query for those IPv6
 addresses would be performed. Couldn't that step somehow be skipped?

 I was wondering about this too, so i compared the debug logs of Pidgin
 talking to the IPv4-only peers (which work) versus the IPv6 peers, and the
 IPv4 connection process also seems to perform the same dnsquery on the
 remote (IPv4) address: however, instead of failing, the IPv4 address
 successfully resolves to itself, unchanged.

 I have not looked at the source yet, but it seems the dnsquery code may
 need to be changed to idempotently resolve IPv6 addresses back to
 themselves in the same way as with IPv4? (Or, perhaps doing this is the
 responsibility of the external resolver, which may be causing this problem
 rather than Pidgin?)

-- 
Ticket URL: <http://developer.pidgin.im/ticket/13157#comment:4>
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