ldns-testns(1)                                                                                                    ldns-testns(1)



NAME
       ldns-testns - simple fake nameserver tool

SYNOPSYS
       ldns-testns [ OPTION ] datafile


DESCRIPTION
       ldns-testns  can  be used to provide answers to DNS queries for testing.  The answers are premade, and can be tailored to
       testing needs. The answers can be wildly invalid or unparseable.

       This program is a debugging aid. It is not efficient, especially with a long config file, but it can give  any  reply  to
       any query.  This can help the developer pre-script replies for queries.

       It listens to IP4 UDP and TCP by default.  You can specify a packet RR by RR with header flags to return.

       ldns-testns is not meant for production use.


OPTIONS
       -r     Listens to a random port. The port number is printed to stdout.


       -p port
              Listens to the specified port.


       -f num Forks  this  number of additional instances that serve the same ports and same datafile. They do not exit; printed
              is 'forked pid: <num>' and you have to kill them yourself.


       -v     Outputs more debug information. It is possible to give this option multiple times to increase verbosity level.


       -6     Bind to IP6 address instead of IP4. Use together with -p.


       datafile
              The data file is read on start up. It contains queries and the packets that should be  sent  in  answer  to  those
              queries. The data file format is explained below.


DATA FILE FORMAT
       The data file format has ';' to denote comment. A number of entries are processed first to last. The first matching entry
       is used to answer the query with. This is a line based format. DNS resource records are entered in zone-file format.

       You can use $ORIGIN and $TTL directives. Zone file '(' and ')' to span multiple lines are not allowed.

       $ORIGIN origin $TTL default_ttl

       ENTRY_BEGIN

       ; first give MATCH lines, that say what queries are matched ; by this entry.  ; 'opcode' makes the query match the opcode
       from  the reply ; if you leave it out, any opcode matches this entry.  ; 'qtype' makes the query match the qtype from the
       reply ; 'qname' makes the query match the qname from the reply ; 'serial=1023' makes the query match if  ixfr  serial  is
       1023.

       MATCH [opcode] [qtype] [qname] [serial=<value>] MATCH [UDP|TCP] MATCH ...

       ; Then the REPLY header is specified.

       REPLY opcode, rcode or flags.
               (opcode)  QUERY IQUERY STATUS NOTIFY UPDATE
               (rcode)   NOERROR FORMERR SERVFAIL NXDOMAIN NOTIMPL YXDOMAIN
                               YXRRSET NXRRSET NOTAUTH NOTZONE
               (flags)   QR AA TC RD CD RA AD

       REPLY ...

       ; any additional actions to do.

       ADJUST copy_id  ; 'copy_id' copies the ID from the query to the answer.

       ; 'sleep=10' sleeps for 10 seconds before giving the answer (TCP is open)

       ADJUST  [sleep=<num>]     ;  sleep  before  giving  any  reply ADJUST [packet_sleep=<num>]  ; sleep before this packet in
       sequence

       SECTION QUESTION <RRs, one per line>    ; the RRcount is determined automatically.

       SECTION ANSWER <RRs, one per line>

       SECTION AUTHORITY <RRs, one per line>

       SECTION ADDITIONAL <RRs, one per line>

       EXTRA_PACKET            ; follow with SECTION, REPLY for more packets.  HEX_ANSWER_BEGIN        ; follow with hex data
                               ; this replaces any answer packet constructed
                               ; with the SECTION keywords (only SECTION QUERY
                               ; is used to match queries). If the data cannot
                               ; be parsed, ADJUST rules for the answer packet
                               ; are ignored

       HEX_ANSWER_END

       ENTRY_END


AUTHOR
       Written by the ldns team as an example for ldns usage, and for testing purposes.

REPORTING BUGS
       Report bugs to <ldns-teamATnlnetlabs.nl>.

COPYRIGHT
       Copyright (C) 2006-2008 NLnet Labs. This is free software. There is NO warranty; not even for MERCHANTABILITY or  FITNESS
       FOR A PARTICULAR PURPOSE.



                                                           14 Dec 2006                                            ldns-testns(1)