NAME

       validns - DNS and DSNSEC zone file validator

VERSION

       This document describes validns version 0.7

SYNOPSIS

       validns -h validns [options] zone-file

       For validating stdin, specify "-" in place of zone-file.

DESCRIPTION

       Coming soon.

OPTIONS

       -h     Produce usage text and quit.

       -f     Quit  on  first  validation  error.   Normally, validns continues working on a zone
              after encountering a parsing or validation error.

       -p name
              Activate policy check name.  By default, only basic checks and  DNSSEC  checks  are
              performed.  This option can be specified multiple times.  See POLICY CHECKS, below,
              for details.  The following names are understood:

              • single-ns

              • cname-other-data

              • dname

              • dnskey

              • nsec3param-not-apex

              • mx-alias

              • ns-alias

              • rp-txt-exists

              • tlsa-host

              • all

       -n N   Use N worker threads for parallelizable operations.  The default is 0,  meaning  no
              parallelization.  Currently only signature verification is parallelizable.

       -q     quiet - do not produce any output

       -s     print validation summary/stats

       -v     be extra verbose

       -I path
              use this path for $INCLUDE files

       -z origin
              use this origin as initial $ORIGIN

       -t epoch-time
              Use  specified  time  instead  of  the  current time when verifying validity of the
              signatures.

BASIC CHECKS

       Every record and every supported directive should be parsable, which consitutes  the  most
       basic  check of all.  The validns program will report the exact reason why it cannot parse
       a record or a directive.

       Other basic checks include:

       • there could only be one SOA in a zone;

       • the first record in the zone must be an SOA record;

       • a record outside the apex;

       • TTL values differ within an RR set (excepting RRSIG);

DNSSEC CHECKS

       • type exists, but NSEC does not mention it for name;

       • NSEC mentions type, but no such record found for name;

       • NSEC says x is the last name, but z exists;

       • NSEC says z comes after x, but nothing does;

       • NSEC says z comes after x, but y does;

       • signature is too new;

       • signature is too old;

       • RRSIG exists for non-existing type type;

       • RRSIG's original TTL differs from corresponding record's;

       • RRSIG(type): cannot find a signer key;

       • RRSIG(type): cannot verify the signature;

       • RRSIG(type): cannot find the right signer key;

       • NSEC3 record name is not valid;

       • multiple NSEC3 with the same record name;

       • no corresponding NSEC3 found for name;

       • type exists, but NSEC3 does not mention it for name;

       • NSEC3 mentions type, but no such record found for name;

       • there are more record types than NSEC3 mentions for name;

       • broken NSEC3 chain, expected name, but nothing found;

       • broken NSEC3 chain, expected name1, but found name2;

       • NSEC3 without a corresponding record (or empty non-terminal).

POLICY CHECKS

       • there should be at least two NS records per name (or zero);

       • CNAME and other data (excluding possible RRSIG and NSEC);

       • DNAME checks: no multiple DNAMEs, no descendants of a node with  a  DNAME;  please  note
         that DNAME/CNAME clash is handled by CNAME and other data check already;

       • DNSKEY  checks:  public  key  too  short,  leading zero octets in public key exponent or
         modulus;

       • NSEC3PARAM, if present, should only be at the zone apex.

       • MX exchange should not be an alias

       • NS nsdname should not be an alias

       • TXT domain name mentioned in RP record must have a corresponding TXT  record  if  it  is
         within the zone

       • domain name of a TLSA record must be a proper prefixed DNS name

BUGS

       • textual segments in TXT and HINFO must be enclosed in double quotes;

       • there cannot be more than 20 textual segments in a TXT record;

       • $INCLUDE directive is not implemented;

       • a dot within a label is not currently supported;

       If  at  least  one  NSEC3  record uses opt-out flag, validns assumes it is used as much as
       possible, that is, every unsigned delegation does not have a corresponding  NSEC3  record.
       This is done for reasons of efficiency, to avoid calculating cryptographic hashes of every
       unsigned delegation.  If this assumption  is  wrong  for  a  zone,  validns  will  produce
       spurious validation errors.

ACKNOWLEDGEMENTS

       Thanks  go  to  Andy  Holdaway,  Daniel  Stirnimann,  Dennis Kjaer Jensen, Goran Bengtson,
       Hirohisa Yamaguchi, Hugo Salgado, Jake Zack, Jakob Schlyter, Koh-ichi Ito, Mathieu Arnold,
       Miek  Gieben,  Patrik  Wallstrom,  Paul  Wouters, Ryan Eby, Tony Finch, Willem Toorop, and
       YAMAGUCHI Takanori for bug reports, testing, discussions, and occasional patches.

       Special thanks to Stephane Bortzmeyer and Phil Regnauld.

       Thanks for AFNIC which funded major portion of the development.   Thanks  for  SWITCH  for
       additional funding.

AUTHORS

       Anton Berezin.

                                            April 2011                                 VALIDNS(1)