[Blink] Blink Ubuntu DNS lookup deadlock?

Tijmen de Mes tijmen at ag-projects.com
Wed Nov 30 11:15:21 CET 2022 

Hi,

I looked at it a bit more and the fact that a CNAME is returned could happen.

However in my Blink I can’t reproduce this fault, I used the domain guest1.voipgateway.org <http://guest1.voipgateway.org/> and I could register(?), if I made a call I got a prompt.

This is how my logs look:

  1 2022-11-30 10:59:46.901093 [blink 4977]: DNS lookup NAPTR guest1.voipgateway.org failed: DNS response contains no answer
  2 2022-11-30 10:59:46.901540 [blink 4977]: DNS lookup SRV _sips._tcp.guest1.voipgateway.org failed: DNS record does not exist
  3 2022-11-30 10:59:46.901950 [blink 4977]: DNS lookup SRV _sip._tcp.guest1.voipgateway.org failed: DNS record does not exist
  4 2022-11-30 10:59:46.902359 [blink 4977]: DNS lookup SRV _sip._udp.guest1.voipgateway.org failed: DNS record does not exist
  5 2022-11-30 10:59:46.902618 [blink 4977]: DNS lookup A guest1.voipgateway.org succeeded, ttl=2675: 212.117.203.57

I don’t have the flatpack so I can’t tell you if something is wrong in there. The lookups are handled by python3-sipsimple.

Best regards,

Timen de Mes
—
AG Projects

> Op 30 nov. 2022, om 10:35 heeft Tijmen de Mes <tijmen at ag-projects.com> het volgende geschreven:
> 
> Hi,
> 
> The fact that you see the timeouts could be a bug.
> 
> The problem is that a NAPTR does exist and is a CNAME? I’ve never seen this and I am not sure this is even valid in DNS.
> 
> AFAIK a NAPTR in this case should return something like:
> 
> 20 100 "s" "SIP+D2U" "" _sip._udp.sip2sip.info.
> 10 100 "s" "SIP+D2T" "" _sip._tcp.sip2sip.info.
> 25 100 "s" "SIPS+D2T" "" _sips._tcp.sip2sip.info.
> 
> After this a SRV lookup would be done.
> 
> Are you able to register your account?
> 
> 
> Best regards,
> 
> Tijmen de Mes
> —
> AG Projects
> 
>> Op 29 nov. 2022, om 17:44 heeft g4-lisz at tonarchiv.ch het volgende geschreven:
>> 
>> Hi there
>> 
>> A few days ago I updated my OS to Pop! OS / Ubuntu 22.04 LTS with the Blink flatpack V5.5.0
>> 
>> A few times it worked flawlessly, but most of the time, starting a call lags a lot and it simply fails with a beep after a few minutes without any further message.
>> 
>> The logs shows issues with DNS:
>> 
>> 2022-11-29 15:22:37.533993 [blink 2]: DNS lookup NAPTR guest1.voipgateway.org failed: no DNS response received, the query has timed out
>> 2022-11-29 15:22:37.534465 [blink 2]: DNS lookup SRV _sip._udp.guest1.voipgateway.org failed: no DNS response received, the query has timed out
>> 2022-11-29 15:22:37.534699 [blink 2]: DNS lookup SRV _sip._tcp.guest1.voipgateway.org failed: no DNS response received, the query has timed out
>> 2022-11-29 15:22:37.534909 [blink 2]: DNS lookup SRV _sips._tcp.guest1.voipgateway.org failed: no DNS response received, the query has timed out
>> 2022-11-29 15:22:37.535100 [blink 2]: DNS lookup A guest1.voipgateway.org failed: no DNS response received, the query has timed out
>> 2022-11-29 15:22:37.637499 [blink 2]: DNS lookup TXT xcap.guest1.voipgateway.org failed: DNS record does not exist
>> 2022-11-29 15:23:08.049049 [blink 2]: DNS lookup NAPTR guest1.voipgateway.org failed: no DNS response received, the query has timed out
>> 2022-11-29 15:23:08.049976 [blink 2]: DNS lookup SRV _sips._tcp.guest1.voipgateway.org failed: no DNS response received, the query has timed out
>> 2022-11-29 15:23:08.050817 [blink 2]: DNS lookup SRV _sip._tcp.guest1.voipgateway.org failed: no DNS response received, the query has timed out
>> 2022-11-29 15:23:08.051510 [blink 2]: DNS lookup SRV _sip._udp.guest1.voipgateway.org failed: no DNS response received, the query has timed out
>> 2022-11-29 15:23:08.052161 [blink 2]: DNS lookup A guest1.voipgateway.org failed: no DNS response received, the query has timed out
>> 2022-11-29 15:23:38.498519 [blink 2]: DNS lookup NAPTR guest1.voipgateway.org failed: no DNS response received, the query has timed out
>> 2022-11-29 15:23:38.498998 [blink 2]: DNS lookup SRV _sip._udp.guest1.voipgateway.org failed: no DNS response received, the query has timed out
>> 2022-11-29 15:23:38.499612 [blink 2]: DNS lookup SRV _sip._tcp.guest1.voipgateway.org failed: no DNS response received, the query has timed out
>> 2022-11-29 15:23:38.500547 [blink 2]: DNS lookup SRV _sips._tcp.guest1.voipgateway.org failed: no DNS response received, the query has timed out
>> 2022-11-29 15:23:38.501826 [blink 2]: DNS lookup A guest1.voipgateway.org failed: no DNS response received, the query has timed out
>> 2022-11-29 15:24:08.946267 [blink 2]: DNS lookup NAPTR guest1.voipgateway.org failed: no DNS response received, the query has timed out
>> 
>> and so on.
>> 
>> But in reality there are no DNS timeouts. IMHO the issue is that Blink doesn't handle the DNS answers right and then somehow deadlocks on the first NATPR request.
>> 
>> I did some sniffing on port 53 and there are no DNS requests for SRV:
>> 
>> 192.168.178.23        192.168.178.1         DNS      82 Standard query 0x1eab NAPTR guest1.voipgateway.org
>> 192.168.178.1         192.168.178.23        DNS      162 Standard query response 0x1eab NAPTR guest1.voipgateway.org CNAME ws1.voipgateway.org SOA ns1.backbone.ch
>> 192.168.178.23        192.168.178.1         DNS      79 Standard query 0x3a0b NAPTR ws1.voipgateway.org
>> 192.168.178.1         192.168.178.23        DNS      141 Standard query response 0x3a0b NAPTR ws1.voipgateway.org SOA ns1.backbone.ch
>> [ ..nothing concerning VOIP...]
>> 192.168.178.23        192.168.178.1         DNS      82 Standard query 0xb5c0 NAPTR guest1.voipgateway.org
>> 192.168.178.1         192.168.178.23        DNS      162 Standard query response 0xb5c0 NAPTR guest1.voipgateway.org CNAME ws1.voipgateway.org SOA ns1.backbone.ch
>> 192.168.178.23        192.168.178.1         DNS      79 Standard query 0x5cba NAPTR ws1.voipgateway.org
>> 192.168.178.1         192.168.178.23        DNS      141 Standard query response 0x5cba NAPTR ws1.voipgateway.org SOA ns1.backbone.ch
>> [ ..nothing concerning VOIP...]
>> 192.168.178.23        192.168.178.1         DNS      82 Standard query 0x63b5 NAPTR guest1.voipgateway.org
>> 192.168.178.1         192.168.178.23        DNS      162 Standard query response 0x63b5 NAPTR guest1.voipgateway.org CNAME ws1.voipgateway.org SOA ns1.backbone.ch
>> 192.168.178.23        192.168.178.1         DNS      79 Standard query 0x6dce NAPTR ws1.voipgateway.org
>> 
>> The queries timeout occurs because Blink does not issue the requests. IMHO Blink does not handle the SOA replies and somehow deadlocks, so other requests are never sent.
>> 
>> Instead it should simply return: NAPTR record does not exist. Go on...
>> 
>> Cheers
>> Till
>> 
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> 
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