[Blink] Blink Ubuntu DNS lookup deadlock?
g4-lisz at tonarchiv.ch
g4-lisz at tonarchiv.ch
Wed Nov 30 15:42:44 CET 2022
Hi
thank you for your replies.
I'm a bit more familiar with DNS than with VOIP... If I get it right the
NAPTR is optional and SIP should work without it.
CNAME can always be a reply to a DNS lookup, it just means: The name you
are looking for is an alias, i.e. guest1.voipgateway.org is a virtual
domain. IMHO Blink does the right thing and sends a second request for
ws1.voipgateway.org.
But for ws1.voipgateway.org there's a NAPTR either. The SOA reply only
means that this an authoritative answer.
IMHO the problem comes with the second DNS reply which contains only a
SOA. Blink seams not to handle this and runs into a timeout.
Strangely enough the whole issue doesn't always appear and all works
fine sometimes. Then I get the same log lines like Timen de Mes:
2022-11-30 15:35:49.340913 [blink 2]: DNS lookup NAPTR
guest1.voipgateway.org failed: DNS response contains no answer
2022-11-30 15:35:49.405083 [blink 2]: DNS lookup SRV
_sip._udp.guest1.voipgateway.org failed: DNS record does not exist
2022-11-30 15:35:49.463001 [blink 2]: DNS lookup SRV
_sip._tcp.guest1.voipgateway.org failed: DNS record does not exist
2022-11-30 15:35:59.932458 [blink 2]: DNS lookup SRV
_sips._tcp.guest1.voipgateway.org failed: DNS record does not exist
2022-11-30 15:35:59.960770 [blink 2]: DNS lookup A
guest1.voipgateway.org succeeded, ttl=3600: 212.117.203.57
Best regards
Till
On 30.11.22 12:10, Adrian Georgescu wrote:
> $dig cname guest1.voipgateway.org
>
> ;; QUESTION SECTION:
> ;guest1.voipgateway.org. IN CNAME
>
> ;; ANSWER SECTION:
> guest1.voipgateway.org. 21600 IN CNAME ws1.voipgateway.org.
>
> The CNAME should not be there for the domain name.
>
> —
> Adrian
>
>
>
>
>> On 30 Nov 2022, at 07:15, Tijmen de Mes <tijmen at ag-projects.com> wrote:
>>
>> 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 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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