NAME

       kafs-dns - AFS filesystem address resolution helper

SYNOPSIS

       /usr/libexec/kafs-dns [OPTION]... <key_serial>
       /usr/libexec/kafs-dns -D [OPTION]... <desc> <calloutinfo>
       /usr/libexec/kafs-dns -V

       Where options are:

              [-v] [-c <conffile>]* [-N <restriction>] [-o <dumpfile>]

DESCRIPTION

       This  program is invoked by the request-key(8) kernel upcall handling program to handle an
       address resolution request on behalf of the in-kernel AFS filesystem driver  to  find  the
       Volume  Location servers for a cell.  It is capable of using static configuration, NSS and
       DNS SRV and AFSDB record lookups.

       Note that this program is not meant to be called directly, though it does have a debugging
       mode that can be used.

       The  first  form  of  the  command,  without  the  -D flag cannot be called directly as it
       requires an under-construction kernel key as its parameter.

       The debugging form, in which -D is given, doesn't require a  key,  but  must  be  given  a
       proposed  key  description and a callout information string.  Information about what it is
       doing is dumped to the output.  The result blob may be binary and  so  is  not  dumped  to
       stdout, but can be dumped to a file with -o <dumpfile>.

       The available options are:

ARGUMENTS

       -D     Execute in debug mode.

       -v     Increase the verbosity of the output.  This may be specified multiple times.

       -c <conffile>
              Specify  a  configuration  file to read instead of the system default.  This may be
              specified multiple times and the configuration files are read and applied in order.

       -N <restriction>
              Apply a restriction to the lookup performed for the  listed  cells  (if  any  are).
              Restrictions include:

              -N vl-srv
                     Don't use SRV records to find Volume Location servers.

              -N vl-afsdb
                     Don't use AFSDB records to find Volume Location servers.

              -N vl-all
                     Don't use SRV or AFSDB records to find Volume Location servers.

              -N vl-host
                     Don't look cell name up as hostname to find a Volume Location server.

              -N vl-dns
                     Don't  do  any lookups to find Volume Location servers.  Use only the static
                     configuration.

       -o <dumpfile>
              Specify a file in which to dump the proposed payload with which  to  instantiate  a
              resolver key.

       -V     Display version information and exit.

       The key description, <desc>, should be the name of a cell prefixed by "afsdb:".

       The  callout  information string, <calloutinfo>, is a comma separated list of none or more
       of the following items:

       ipv4   Get IPv4 addresses only.

       ipv6   Get IPv6 addresses only.

       srv=<ver>
              Allow the extra information that can be gleaned from SRV records to be rendered  as
              output format <ver>, where <ver> is a number.

EXIT STATUS

       0      On success.

       1      If an error occurs during processing.

       2      If a command line error occurs.

       3      If bad configuration is detected.

EXAMPLE

       The program can be called with something like:

              /usr/libexec/kafs-dns -D afsdb:example.com srv=1

       The program can also be invoked indirectly with something like:

              keyctl request2 dns_resolver afsdb:example.com srv=1 @s

       which will return the serial number of a key that can then be displayed.

SEE ALSO

       kafs(7), kafs-client.conf(5), keyctl(1), request-key(8)