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download PDF document: rblcheck.1.pdf

rblckeck(1) FreeBSD General Commands Manual rblckeck(1)



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 assotiated 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 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.
User Utilities Apr 2005 rblckeck(1)