Difference between revisions of "Dnstest"

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(New page: This program simply checks whether or not you have the authoritative nameserver for a given domain. Implicitly called by the other dns* programs I've written, all it does is look up a rand...)
 
 
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==Intro==
This program simply checks whether or not you have the authoritative
This program simply checks whether or not you have the authoritative
nameserver for a given domain. Implicitly called by the other dns* programs
nameserver for a given domain. It is implicitly called by the other
I've written, all it does is look up a random subdomain and see if the
dns* programs I've written, all it does is look up a random subdomain
response comes back.
and see if the response comes back.
 
==Usage==
<pre>
./dnstest --domain <domain>
 
-h --help
    Help (this page).
-d --domain <domain>
    The domain name to check. The lookup will be for [random].domain.
--dns <server>
    Set the DNS server. Default: the system's first DNS server.
-s --source <address>
    The local address to bind to. Default: any (0.0.0.0)
-p --port <port>
    The local port to listen on. I don't recommend changing this.
    default: 53.
--rport <port>
    The port to send the request to. Default: 53.
-u --username
    Drop privileges to this user after opening socket (default: 'nobody')
-V --version
    Print the version and exit
</pre>
 
==Example==
There isn't really much to this program, but here's how it looks
running on my laptop (which is the authoritative server for
skullseclabs.org):
<pre>
$ sudo ./dnstest
Listening for requests on 0.0.0.0:53
Sending request to 208.81.7.10:53
Trying to look up domain: avobwnjlopakgmdt.skullseclabs.org
Received a response: avobwnjlopakgmdt.skullseclabs.org
Contgratulations, you have the proper DNS server for this domain!
</pre>

Latest revision as of 16:06, 21 February 2010

Intro

This program simply checks whether or not you have the authoritative nameserver for a given domain. It is implicitly called by the other dns* programs I've written, all it does is look up a random subdomain and see if the response comes back.

Usage

./dnstest --domain <domain>

 -h --help
    Help (this page).
 -d --domain <domain>
    The domain name to check. The lookup will be for [random].domain.
 --dns <server>
    Set the DNS server. Default: the system's first DNS server.
 -s --source <address>
    The local address to bind to. Default: any (0.0.0.0)
 -p --port <port>
    The local port to listen on. I don't recommend changing this.
    default: 53.
 --rport <port>
    The port to send the request to. Default: 53.
 -u --username
    Drop privileges to this user after opening socket (default: 'nobody')
 -V --version
    Print the version and exit

Example

There isn't really much to this program, but here's how it looks running on my laptop (which is the authoritative server for skullseclabs.org):

$ sudo ./dnstest
Listening for requests on 0.0.0.0:53
Sending request to 208.81.7.10:53
Trying to look up domain: avobwnjlopakgmdt.skullseclabs.org
Received a response: avobwnjlopakgmdt.skullseclabs.org
Contgratulations, you have the proper DNS server for this domain!