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       tinydyndns-update - update TYPE A record in data.cdb


       tinydyndns-update fqdn dynip


       tinydyndns-update  changes  the  data of a TYPE A record in data.cdb in
       the current directory.  Other  than  tinydns-data(8),  tinydndns-update
       does  not  know  about  the  source  file  data  but changes the binary
       database data.cdb directly.

       First tinydyndns-update checks if the given fqdn has a TYPE A record in
       data.cdb.   Then it checks if the given IP address differs from the one
       in the TYPE A record in data.cdb, or if the record’s  timestamp  should
       be  updated.   Finally  if  data.cdb needs to change, tinydyndns-update
       copies data.cdb to data.tmp, changes the  IP  address  of  the  TYPE  A
       record of fqdn to dynip in data.tmp, optionally adjusts time-to-live or
       time-to-die, and renames data.tmp to data.cdb.


       TTL    time-to-live.   The  environment  variable  TTL  overrides   the
              default  time-to-live in seconds (0 if TTD is set, otherwise 5).
              If TTL is not set or zero, the time-to-live of the  record  will
              not change.  $TTL must be an integer.

       TTD    time-to-die.   $TTD  must  be an integer, specifying a number of
              seconds.  If TTD is set, the timestamp of the record is  set  to
              the  current  time  plus $TTD seconds, and TTL is set to zero by
              default, so that tinydns(8) interpretes the timestamp  as  time-
              to-die.   Note: you probably want to adjust SOA ttl, or create a
              wildcard record, to prevent DNS caches  from  caching  nxdomain,
              when using this feature.

       LOC    location.   $LOC must be two characters long.  If LOC is set, it
              specifies the client location for records to be updated.


       If tinydyndns-update cannot find a TYPE A record for fqdn in  data.cdb,
       it prints a warning and exits 114.

       If  dynip  does  not differ from the IP address of the TYPE A record of
       fqdn in  data.cdb,  and  the  environment  variable  TTD  is  not  set,
       tinydyndns-update prints a note and exits 0.

       tinydyndns-update  exits  100  if  it has trouble opening data.cdb, and
       leaves data.cdb unchanged.

       tinydyndns-update exits 111 on temporary  error,  and  leaves  data.cdb

       If data.cdb was changed successfully, tinydyndns-update exits 0.




       tinydyndns-data(8), tinydyndns-conf(8)


       Gerrit Pape <>