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conf

NAME

Net::DNS::SEC::Tools::conf − DNSSEC−Tools configuration routines.

SYNOPSIS

  use Net::DNS::SEC::Tools::conf;
  %dtconf = parseconfig();
  %dtconf = parseconfig("localzone.keyrec");
  cmdcheck(\%options_hashref);
  $conferrs = dt_confcheck();
  $prefixdir = getprefixdir();
  $confdir = getconfdir();
  $conffile = getconffile();
  setconffile("dt−local.conf");
  $statedir = getlocalstatedir();
  $statedir = makelocalstatedir();
  $statesub = makelocalstatedir("logs/zones");
  $packed = runpacked();
  erraction(ERR_MSG);
  err("unable to open keyrec file",1);

DESCRIPTION

The routines in this module perform configuration operations. Some routines access the DNSSEC-Tools configuration file, while others validate the execution environment.

The DNSSEC tools have a configuration file for commonly used values. These values are the defaults for a variety of things, such as encryption algorithm and encryption key length. The Net::DNS::SEC::Tools::conf module provides methods for accessing the configuration data in this file.

dnssec−tools.conf is the filename for the DNSSEC tools configuration file. The full path depends on how DNSSEC-Tools was configured; see the DIRECTORIES section for the complete path. The paths required by conf.pm are set at DNSSEC-Tools configuration time.

The DNSSEC tools configuration file consists of a set of configuration value entries, with only one entry per line. Each entry has the "keyword value" format. During parsing, the line is broken into tokens, with tokens being separated by spaces and tabs. The first token in a line is taken to be the keyword. All other tokens in that line are concatenated into a single string, with a space separating each token. The untokenized string is added to a hash table, with the keyword as the value’s key.

Comments may be included by prefacing them with the ’#’ or ’;’ comment characters. These comments can encompass an entire line or may follow a configuration entry. If a comment shares a line with an entry, value tokenization stops just prior to the comment character.

An example configuration file follows:

    # Sample configuration entries.
    algorithm       rsasha1     # Encryption algorithm.
    ksk_length      2048        ; KSK key length.

Another aspect of DNSSEC-Tools configuration is the error action used by the DNSSEC-Tools Perl modules. The action dictates whether an error condition will only give an error return, print an error message to STDERR , or print an error message and exit. The erraction() and err() interfaces are used for these operations.

INTERFACES

dt_confcheck(errflag)

This routine performs a number of configuration checks to ensure the environment is sufficient to support the DNSSEC-Tools configuration. If errflag is 0, then the checks are performed quietly; otherwise, error messages will be printed.

The checks are:

        * The dnssec−tools sysconf directory exists.
        * The dnssec−tools sysconf directory is a directory.
        * The dnssec−tools directory exists.
        * The dnssec−tools directory is a directory.
        * The dnssec−tools config file exists.
        * The dnssec−tools config file is a regular file.
        * The dnssec−tools config file isn't empty.
        * The local state directory name isn't longer than 75
          characters (to allow for the rollmgr command socket.)
        * The local state directory is a directory.
        * The local state directory can be created if necessary.
        * The local state directory's dnssec−tools subdirectory
          can be created if necessary, or is writable if it
          already exists.
        * The local state directory's run subdirectory
          can be created if necessary, or is writable if it
          already exists.

Return Values:

        0       no errors were found
        >0      some number of configuration checks failed

parseconfig()

This routine reads and parses the system’s DNSSEC tools configuration file. The parsed contents are put into a hash table, which is returned to the caller.

parseconfig(conffile)

This routine reads and parses a caller-specified DNSSEC tools configuration file. The parsed contents are put into a hash table, which is returned to the caller. The routine quietly returns if the configuration file does not exist.

cmdcheck(\%options_hashref)

This routine ensures that the needed commands are available and executable. If any of the commands either don’t exist or aren’t executable, then an error message will be given and the process will exit. If all is well, everything will proceed quietly onwards.

The commands keys currently checked are zonecheck, keygen, and zonesign. The pathnames for these commands are found in the given options hash referenced by %options_hashref. If the hash doesn’t contain an entry for one of those commands, it is not checked.

If this routine is called from a PAR-packed script, then it will look in the package directory for the commands. It will also set their file modes to 0755, as PAR appears to ignore file modes when packaging programs.

getconfdir()

This routine returns the name of the DNSSEC-Tools configuration directory.

getconffile()

This routine returns the name of the DNSSEC-Tools configuration file.

setconffile()

This routine sets the name of the DNSSEC-Tools configuration file.

Return values:
1 returned on success
0 returned if the specified configuration file does not
exist or is not a regular file

getprefixdir()

This routine returns the name of the DNSSEC-Tools prefix directory.

getlocalstatedir()

This routine returns the name of the local state directory.

runpacked()

This routine returns a boolean indicating if the executing command is running from a PAR-packed script.

makelocalstatedir(subdir)

This routine makes the local state directory and returns its name. The directory is created only if it doesn’t exist already.

If the optional subdir subdirectory is specified, then that directory is created within the local state directory. In this case, the path of subdir is returned. subdir may consist of several intermediate directories, as well as the terminal directory. For example, makelocalstatedir("logs/zones/errors") will create the logs/zones/errors hierarchy within the local state directory.

makelocalstatedir(subdir) uses the File::Path module, which is available on all modern Perl versions.

An empty string is returned if there are any errors. The following errors may be encountered:

    * I<File::Path> could not be loaded
    * Unable to create the local state directory
    * Unable to create a component of I<subdir>
    * Full path (local state directory and I<subdir>) already
      exists and is not a directory

boolconvert(config−value)

This routine converts configuration values into appropriate boolean values. The following text conversions are made:

    1 − 'true', 't', 'yes', 'y'
    0 − 'false', 'f', 'no', 'n'

All other text values are converted to 0.

Positive values are converted to 1. Negative values are converted to 0.

erraction(error_action)

This interface sets the error action for DNSSEC-Tools Perl modules. The valid actions are:

    ERR_SILENT          Do not print an error message, do not exit.
    ERR_MSG             Print an error message, do not exit.
    ERR_EXIT            Print an error message, exit.

ERR_SILENT is the default action.

The previously set error action is returned.

err("error message",exit_code)

The err() interface is used by the DNSSEC-Tools Perl modules to report an error and exit, depending on the error action.

The first argument is an error message to print -- if the error action allows error messages to be printed.

The second argument is an exit code -- if the error action requires that the process exit.

DIRECTORIES

The default directories for this installation are:

  prefix                         : /usr
  sysconf                        : /etc
  localstatedir                  : /var
  DNSSEC−Tools configuration file: /etc/dnssec−tools

These can be overridden using the following environmental variables:

  prefix                         : DT_PREFIX
  sysconf                        : DT_SYSCONFDIR
  localstatedir                  : DT_STATEDIR

COPYRIGHT

Copyright 2004−2011 SPARTA , Inc. All rights reserved. See the COPYING file included with the DNSSEC-Tools package for details.

AUTHOR

Wayne Morrison, tewok AT users DOT sourceforge DOT net

SEE ALSO

dnssec−tools.conf(5)

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