[tor-bugs] #7797 [Tor]: tor DNS resolver unable to handle/return SRV type DNS records

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#7797: tor DNS resolver unable to handle/return SRV type DNS records
--------------------+-------------------------------------------------------
 Reporter:  mr-4    |          Owner:     
     Type:  defect  |         Status:  new
 Priority:  normal  |      Milestone:     
Component:  Tor     |        Version:     
 Keywords:          |         Parent:     
   Points:          |   Actualpoints:     
--------------------+-------------------------------------------------------
 Tor's internal DNS resolver is incapable of looking up SRV (service type)
 DNS records.

 SRV-type DNS records have the following format: _service._protocol.name
 (like "_sip._udp.ekiga.net" for example). The "output" I am getting from
 tor is as follows (127.0.0.1 refers to tor's internal DNS server):

 # dig @127.0.0.1 _sip._udp.ekiga.net SRV

 ; <<>> DiG 9.7.3-P1-RedHat-9.7.3-2.P1.fc18 <<>> @127.0.0.1
 _sip._udp.ekiga.net SRV
 ; (1 server found)
 ;; global options: +cmd
 ;; Got answer:
 ;; ->>HEADER<<- opcode: QUERY, status: NOTIMP, id: 29790
 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

 ;; QUESTION SECTION:
 ;_sip._udp.ekiga.net.           IN      SRV

 ;; Query time: 2 msec
 ;; SERVER: 127.0.0.1 # 53(127.0.0.1)
 ;; WHEN: Wed Dec 26 00:45:05 2012
 ;; MSG SIZE  rcvd: 37

 Note the "status" above as NOTIMP (Not Implemented). The correct output,
 using a "proper" DNS server (marked as xxx.xxx.xxx.xxx below) is as
 follows:

 # dig @xxx.xxx.xxx.xxx _sip._udp.ekiga.net SRV

 ; <<>> DiG 9.7.3-P1-RedHat-9.7.3-2.P1.fc18 <<>> @xxx.xxx.xxx.xxx
 _sip._udp.ekiga.net SRV
 ; (1 server found)
 ;; global options: +cmd
 ;; Got answer:
 ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 65507
 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

 ;; QUESTION SECTION:
 ;_sip._udp.ekiga.net.           IN      SRV

 ;; ANSWER SECTION:
 _sip._udp.ekiga.net.    86400   IN      SRV     0 0 5060 ekiga.net.

 ;; ADDITIONAL SECTION:
 ekiga.net.              85881   IN      A       86.64.162.35

 ;; Query time: 24 msec
 ;; SERVER: xxx.xxx.xxx.xxx # 53(xxx.xxx.xxx.xxx)
 ;; WHEN: Wed Dec 26 00:48:01 2012
 ;; MSG SIZE  rcvd: 82

 As evident, the "status" returned is NOERROR (No Error).

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7797>
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