NAME

       rblckeck - DNSBL lookup utility

SYNOPSYS

       rblcheck [-s zone] [-S zone-file] [-c] [-tmvq] [-n nsaddr] address...

DESCRIPTION

       rblcheck  is  a  simple command-line to perform DNSBL (DNS-based blocklists) lookups.  For
       every IP address (or a name, in which case it will be resolved to an address  first),  the
       utility  verifies whenever it is listed in a (list of) DNS blocklists specified with -s or
       -S options, optionally obtains text associated with the listing (usually it is either some
       description  about  the  reason of the listing or an URL referring to such a description),
       and displays results on standard output.

       The program is implemented on top of udns(3) library.

OPTIONS

       The following options are recognized by rblcheck:

       -s zone
              add the given zone DNSBL name to the list of active zones.

       -S zone-file
              add list of zones from the named zone-file to the list of active  zones  (the  file
              specifies one zone as the first word on a line, empty lines and lines starting with
              `#' character are ignored).

       -c     reset active zone list.

       -v     be more verbose, produce more detailed output.

       -q     the opposite for -v -- produce less detailed output.

       -t     obtain text for listed addresses.

       -n nsaddr
              Use the given nameserver (given as IPv4 or IPv6 address) instead  of  the  default.
              The same effect may be achieved by setting $NSCACHEIP environment variable.

       -m     stop after first hit, ie after the first address which is found to be listed.

       -h     print short help and exit.

       If  no  -s,  -S  and -c options are given, rblcheck will try to obtain list of zones using
       $RBLCHECK_ZONES environment variable, or ~/.rblcheckrc, or /etc/rblckechrc files, in  that
       order.  If no zones are found, it will exit unsuccessefully.

RETURN VALUE

       When no addresses given are listed and no errors occurred, rblcheck exits with code 0.  If
       at least one address is listed, rblcheck returns 100.  In case  of  DNS  errors,  rblcheck
       returns 2.

ENVIRONMENT

       $RBLCHECK_ZONES
              if  no -s, -S or -c option is given, rblcheck tries this variable to obtain list of
              DNSBL zones to check against.

FILES

       $HOME/.rblcheckrc and /etc/rblcheckrc
              if no -s, -S or -c option is given, and no $RBLCHECK_ZONES environment variable  is
              set,  rblcheck will try the two files (the first one that exists) to obtain list of
              DNSBL zones to check against.  Each line specifies one zone  (only  first  word  in
              each line is used).  Empty lines and lines starting with `#' character are ignored.

SEE ALSO

       dnsget(1) resolv.conf(5) udns(3).

AUTHOR

       This program and manual pages are written by Michael Tokarev.