askmara - do simple dns queries
askmara queries the user-specified dns server for records, and
outputs the reply in a csv2-compatible format (csv2 is the format of zone
files that maradns uses).
askmara [-n] [ -v | -t timeout] query [ server ]
If this is present, the following argument is the askmara timeout, in
seconds. Note that askmara can not both have a user-defined
timeout and verbose output.
If this is set, askmara
will verbosely output the complete reply that the server sent. Note
that this verbose output is not csv2-compatible.
If this is set, askmara, when sending out a query, will not
request DNS recursion; in other words, askmara will request that the
remote DNS server not contact other DNS servers to answer the query in
dns record to be queried. The query has two sections:
The type of record we desire, and the hostname we want this record for.
The type of query can have two forms: A one-letter mnemonic, or a
numeric rtype followed by a colon. This is immediately concatenated by
the full name of the host name we wish to look up.
For example, to ask for the IP of 'example.com.', we can use the one-letter
mnemonic, in the form 'Aexample.com.', or we can use the numeric RR followed
by a colon, giving the query '1:example.com.' (since A has the record type
of one). Note that the query name needs the trailing dot at the end.
Askmara supports a handful one-letter mnemonics, as follows:
A signifies a request for an A (ipv4 address) RR
N signifies a NS RR
C signifies that we are asking for a CNAME RR
S signifies that we want a SOA RR
P signifies that we want a PTR RR
@ signifies that we mant a MX RR
T signifies that we want a TXT RR
Z signifies that we want to ask for all RRs.
- IP address of the dns server to be queried. If no server is given,
askmara will query 127.0.0.1.
Asking the server with the ip 127.0.0.1 for the IP address of example.com:
Asking the server with the ip 188.8.131.52 for the IP address of example.com:
askmara Aexample.com. 184.108.40.206
Asking the server with the ip address 127.0.0.1 for the IP address of
example.com, using the rr_number:query format:
Asking the server with the ip address 127.0.0.1 for a SRV record. In
particular, we ask for the "http over tcp" service for example.net.
Since askmara doesn't have a mnemonic for SRV record types, we
use the numeric code (33 for SRV):
Asking the server with the ip address 127.0.0.1 for the AAAA (ipv6 ip)
record for example.net:
Note that the output will be a raw DNS packet in both the SRV
and AAAA examples.
When askmara is asked for an SOA record, the output of askmara
closely resembles the format of a csv2 file, but can not be parsed as a
csv2 file without modification.
askmara outputs multi-chunk ("character-string") TXT
records incorrectly (it only outputs the first chunk).
THIS SOFTWARE IS PROVIDED BY THE AUTHORS ''AS IS'' AND ANY EXPRESS
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
MaraDNS is written by Sam Trenholme. Jaakko Niemi used 5 minutes
to roll this manpage together, which Sam has subsequently revised.