[Blink] Blink Ubuntu DNS lookup deadlock?

[Tijmen de Mes]

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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