From Newsgroup: comp.protocols.dns.bind
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On 8/21/20 4:26 PM, Marc Roos wrote:
Is it possible to use srv lookups, like eg cname. I do not want to=20
create SRV record, I just want to 'get' the ip addresses, that I=20
would get vai srv lookup.
I don't know of any over the counter - if you will - way to do what - I=20 think - you want to do.
Say I have this task
=20
[@temp3]$ dig +short server.test.marathon.mesos
192.168.123.101
192.168.124.50
192.168.124.52
192.168.124.51
192.168.123.100
192.168.123.102
Are these the IP addresses that the names in the following SRV records=20 resolve to?
[@temp3]$ dig +short srv _http-apps._server.test._tcp.marathon.mesos
0 1 31024 server.test-usbzr-s3.marathon.mesos.
0 1 31852 server.test-z9x84-s3.marathon.mesos.
0 1 31790 server.test-k7g8r-s4.marathon.mesos.
=20
[marc@os0 temp3]$ dig +short srv=20 _http-demo._server.test._tcp.marathon.mesos
0 1 31791 server.test-c8g8b-s4.marathon.mesos.
0 1 31025 server.test-wtbza-s3.marathon.mesos.
0 1 31853 server.test-d0x87-s3.marathon.mesos.
=20
I would like to only make available the ip addresses that are in the=20
same range. If I would use a cname like this:
What does "same range" mean in this context?
Is it the client's IP range? Or is it the server's IP range? Or some=20 reference to _http-apps vs _http-demo?
To me, the following three owner names are completely independent of=20
each other.
- server.test.marathon.mesos
- _http-apps._server.test._tcp.marathon.mesos
- _http-demo._server.test._tcp.marathon.mesos
I see how we as humans can probably correlate the three. But I don't=20
see how BIND will do it.
server.local. CNAME server.test.marathon.mesos.
That seems like a simple enough alias. Simple enough that I think that=20
it's existence can largely be ignored and focus on the IP extraction=20
from SRV record(s) that I think you're asking about.
I would get 6 of which 3 ip addresses are not in the same range. So I
need to have something like
=20
server.local. ??? _http-apps._server.test._tcp.marathon.mesos.
How are you going to convey the "???" portion in the owner name of the=20
DNS query?
Is this possible in bind-9.8.2-0.68.rc1.el6_10.3.x86_64?
I don't think what - I'm speculating - you want is possible as is with=20
stock BIND.
I do wonder if you might be able to write a custom Dynamic Loadable Zone =
database (?) driver that might be able to do what you want.
Specifically, if you could create a DLZ driver that could take the query =
name, apply some logic to it (to determine the "???" above), perform the =
proper resolution of the SRV record(s), post process, and return the=20
desired result to the original DNS query.
$Marc's_Request IN CNAME bind-dlz.sourceforge.net
Link - BIND DLZ Home
-
http://bind-dlz.sourceforge.net/
Aside: I think this is atypical of BIND. But I also think that it=20
/may/ be in BIND's wheel house to ... hack a possible solution to.
Further aside: I have wondered about a custom DLZ that would return the =
client's IP address (as seen by the server). I'd like to roll my own=20 "what's my IP" type service. }:-)
--=20
Grant. . . .
unix || die
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