#!/usr/bin/perl

#
# A simple configuration file builder based on questions listed in
# its own configuration file.  It would certainly be easy to use this
# for other (non-snmp) programs as well.
#

use Getopt::Std;
use Term::ReadLine;
use IO::File;
use Data::Dumper;
use File::Copy;
if ($^O eq 'MSWin32') {
  eval 'require Win32::Registry;';
  if ($@) {
    print "\nWarning: Perl module Win32::Registry is not installed.  This module is\n";
    print "         required to read the SNMPSHAREPATH and SNMPCONFPATH values from \n";
    print "         the registry.  To use snmpconf without the module you need to\n";
    print "         define SNMPSHAREPATH and SNMPCONFPATH as environment variables\n";
    print "         or use the -c and -I command line options.\n";
  }
}

# globals
%tokenitems=qw(line 1 info 1 comment 1);
%arrayitems=qw(question 1 validanswer 1);

# default folder for snmpconf-data
if (defined(&my_getenv("SNMPSHAREPATH"))) {
  $opts{'c'} = &my_getenv("SNMPSHAREPATH") . "/snmpconf-data";
}
else {
  $opts{'c'} = "/usr/share/snmp/snmpconf-data";
}
 
# default config file path
if (defined(&my_getenv("SNMPCONFPATH"))) {
  $confpath = &my_getenv("SNMPCONFPATH");
}
else {
  $confpath = "/usr/share/snmp";
}

# home environment variable
if (defined(&my_getenv("HOME"))) {
  $home = &my_getenv("HOME") . "/.snmp";
}
else {
  $home = "(HOME dir - n/a)";
}

# read the argument string
getopts("qadhfc:piI:r:R:g:G", \%opts);

# display help
if ($opts{'h'}) {
    print "$0 [options] [FILETOCREATE...]\n";
    print "options:\n";
    print "  -f           overwrite existing files without prompting\n";
    print "  -i           install created files into $confpath.\n";
    print "  -p           install created files into $home.\n";
    print "  -I DIR       install created files into DIR.\n";
    print "  -a           Don't ask any questions, just read in current\n";
    print "                   current .conf files and comment them\n";
    print "  -r all|none  Read in all or none of the .conf files found.\n";
    print "  -R file,...  Read in a particular list of .conf files.\n";
    print "  -g GROUP     Ask a series of GROUPed questions.\n";
    print "  -G           List known GROUPs.\n";
    print "  -c conf_dir  use alternate configuration directory.\n";
    print "  -q           run more quietly with less advice.\n";
    print "  -d           turn on debugging output.\n";
    print "  -D           turn on debugging dumper output.\n";
    exit;
}

# setup terminal interface.
$ENV{'PERL_RL'}='o=0' if (!exists($ENV{'PERL_RL'}));
$term = new Term::ReadLine 'snmpconf';

# read in configuration file set
read_config_files($opts{'c'}, \%filetypes);
debug(my_Dumper(\%filetypes));

if ($opts{'G'}) {
    Print("\nKnown GROUPs of tokens:\n\n");
    foreach my $group (keys(%groups)) {
	print "  $group\n";
    }
    Print("\n");
    exit;
}

#
# Expand the search path in case it contains multiple directories
# separated by : (Unix) or ; (Win32)
#
my $ENV_SEPARATOR = ':';
if ($^O eq 'MSWin32') {
  $ENV_SEPARATOR = ';';
}
my @searchpath = split(/$ENV_SEPARATOR/, $confpath);
push @searchpath, "/etc/snmp";
push @searchpath, ".";
push @searchpath, "$home";

# Remove trailing /'s or \'s
for (my $i=0; $i <= $#searchpath; $i++) {
  $searchpath[$i] =~ /(.*?)([\/\\])*$/;
  $searchpath[$i] = $1;
}

# Determine persistent directory.  Order of preference:
# 
# file in SNMP_PERSISTENT_FILE environment variable
# directory defined by persistentDir snmp.conf variable
# directory in SNMP_PERSISTENT_DIR environment variable
# default PERSISTENT_DIRECTORY directory
my $persistentDir = "";
my $persistentFile = "";

# SNMP_PERSISTENT_FILE environment variable
if (defined(&my_getenv("SNMP_PERSISTENT_FILE"))) {
  $persistentFile = &my_getenv("SNMP_PERSISTENT_FILE");
  debug ("persistent file: SNMP_PERSISTENT_FILE environment variable set\n");
}

# snmp.conf persistentDir
if (!($persistentDir) && !($persistentFile)) {
  foreach my $i (@searchpath) {
    debug ("Searching file $i/snmp.conf for persistentDir\n");
    my $temp = get_persistentDir("$i/snmp.conf");
    if ($temp) {
      debug("persistent directory: set to $temp in $i/snmp.conf\n");
      $persistentDir = $temp;
      last;
    }
  }
}

# SNMP_PERSISTENT_DIR environment variable
if (!($persistentDir) && !($persistentFile)) {
  if (&my_getenv("SNMP_PERSISTENT_DIR")) {
    $persistentDir = &my_getenv("SNMP_PERSISTENT_DIR");
    debug ("persistent directory: SNMP_PERSISTENT_DIR environment variable set\n");
  }
}

# PERSISTENT_DIRECTORY default variable
if (!($persistentDir) && !($persistentFile)) {
  $persistentDir = "/var/lib/net-snmp";
  debug ("persistent directory: Using default value\n");
}

# Rebuild search path without persistent folder
# Note:  persistent file handled in Find existing 
# files to possibly read in section
if ($persistentDir) {
  # Remove trailing /'s or \'s
  $persistentDir =~ /(.*?)([\/\\])*$/;
  $persistentDir = $1;
  debug ("persistent directory: $persistentDir\n");

  my @searchpath_old = @searchpath;
  @searchpath = ();
  foreach my $path_temp (@searchpath_old) {
    if ($path_temp eq $persistentDir) {
      debug("skipping persistent directory $path_temp\n");
      next;
    }
    push @searchpath, $path_temp;
  }
}

# Reset $confpath to the first path
$confpath = $searchpath[0];

#
# Find existing files to possibly read in.
#
push @searchpath, $opts{I} if ($opts{I});
foreach my $i (@searchpath) {
    debug("searching $i\n");
    foreach my $ft (keys(%filetypes)) {
        if ("$i/$ft" eq $persistentFile) {
          debug("skipping persistent file $i/$ft\n");
          next;
        }
	debug("searching for $i/$ft\n");
	$knownfiles{"$i/$ft"} = $ft if (-f "$i/$ft");
	my $localft = $ft;
	$localft =~ s/.conf/.local.conf/;
	$knownfiles{"$i/$localft"} = $ft if (-f "$i/$localft");
    }
}

#
# Ask the user if they want them to be read in and read them
#
if (keys(%knownfiles)) {
    my @files;
    if (defined($opts{'r'})) {
	if ($opts{'r'} eq "all" || $opts{'r'} eq "a") {
	    @files = keys(%knownfiles);
	} elsif ($opts{'r'} ne "none" && $opts{'r'} ne "n") {
	    print "unknown argument to -r: $opts{'r'}\n";
	    exit(1);
	}
    } elsif(defined($opts{'R'})) {
	@files = split(/\s*,\s*/,$opts{'R'});
	foreach my $i (@files) {
	    my $x = $i;
	    $x =~ s/.*\/([^\/]+)$/$1/;
	    $knownfiles{$i} = $x;
	}
	Print("reading: ", join(",",@files),"\n");
    } else {
	@files = display_menu(-head => "The following installed configuration files were found:\n",
			      -tail => "Would you like me to read them in?  Their content will be merged with the\noutput files created by this session.\n\nValid answer examples: \"all\", \"none\",\"3\",\"1,2,5\"\n",
			      -multiple => 1,
			      -question => 'Read in which',
			      -defaultvalue => 'all',
			      sort keys(%knownfiles));
    }
    foreach my $i (@files) {
	debug("reading $i\n");
	read_config($i, $knownfiles{$i});
    }
}

if ($opts{'g'}) {
    my @groups = split(/,:\s/,$opts{'g'});
    foreach my $group (@groups) {
	do_group($group);
    }
} elsif ($#ARGV >= 0) {
    #
    # loop through requested files.
    #
    foreach my $i (@ARGV) {
	if (!defined($filetypes{$i})) {
	    warn "invalid file: $i\n";
	} else {
	    if ($opts{'a'}) {
		$didfile{$i} = 1;
	    } else {
		build_file($term, $i, $filetypes{$i});
	    }
	}
    }
} else {
    #
    # ask user to select file type to operate on.
    #
    while(1) {
	my $line = display_menu(-head => "I can create the following types of configuration files for you.\nSelect the file type you wish to create:\n(you can create more than one as you run this program)\n",
				-question => 'Select File',
				-otheranswers => ['quit'],
				-mapanswers => { 'q' => 'quit' },
				keys(%filetypes));
	last if ($line eq "quit");
	debug("file selected: $line\n");
	build_file($term, $line, $filetypes{$line});
    }
}

#
# Write out the results to the output files.
#
output_files(\%filetypes, $term);


#
# Display the files that have been created for the user.
#
Print("\n\nThe following files were created:\n\n");
@didfiles = keys(%didfile);
foreach my $i (@didfiles) {
    if ($didfile{$i} ne "1") {
	if ($opts{'i'} || $opts{'I'}) {
          $opts{'I'} = "$confpath" if (!$opts{'I'});

          if (! (-d "$opts{'I'}") && ! (mkdir ("$opts{'I'}", 0755))) {
	    print "\nCould not create $opts{'I'} directory: $!\n";
	    print ("File $didfile{$i} left in current directory\n");
	  }
	  else {
            move ("$opts{'I'}/$i", "$opts{'I'}/$i.bak") if (-f "$opts{'I'}/$i");
            if (move ("$didfile{$i}", "$opts{'I'}")) {
              print("  $didfile{$i} installed in $opts{'I'}\n");	    
            }
            else {
              print "\nCould not move file $didfile{$i} to $opts{'I'}/$i: $!\n";
              print ("File $didfile{$i} left in current directory\n");
            }
          }
	} elsif ($opts{'p'}) {
	  if (! (-d "$home") && ! (mkdir ("$home", 0755))) {
	    print "\nCould not create $home directory: $!\n";
	    print ("File $didfile{$i} left in current directory\n");
	  }
	  else {	    
	    move ("$home/$i", "$home/$i.bak") if (-f "$home/$i");
	    if (move ("$didfile{$i}", "$home")) {
	      print("  $didfile{$i} installed in $home\n");
	    }
	    else {
	      print "\nCould not move file $didfile{$i} to $home: $!\n";
	      print ("File $didfile{$i} left in current directory\n");
  	    }
	  }
  	} else {
	    Print("  $didfile{$i} ",
	    ($i ne $didfile{$i})?"[ from $i specifications]":" ","\n");
	    if ($opts{'d'}) {
		open(I,$didfile{$i});
		debug("    " . join("    ",<I>) . "\n");
		close(I);
	    }
	}
    }
}

if (!$opts{'p'} && !$opts{'i'} && !$opts{'I'}) {
    Print("\nThese files should be moved to $confpath if you
want them used by everyone on the system.  In the future, if you add 
the -i option to the command line I'll copy them there automatically for you.

Or, if you want them for your personal use only, copy them to
$home .  In the future, if you add the -p option to the
command line I'll copy them there automatically for you.

");
}

###########################################################################
# Functions
###########################################################################

sub Print {
    print @_ if (!$opts{'q'});
}
#
# handle a group of questions
#
sub get_yn_maybe {
    my $question = shift;
    my $ans = "y";
    if ($question ne "") {
	$ans = get_answer($term, $question,
			  valid_answers(qw(yes y no n)), 'y');
    }
    return ($ans =~ /^y/)?1:0;
}

sub do_group {
    my $group = shift;
    die "no such group $group\n" if (!$groups{$group});
    foreach my $token (@{$groups{$group}}) {
	if ($token->[0] eq "message") {
	    Print ("$token->[1] $token->[2]\n");
	} elsif ($token->[0] eq "subgroup") {
	    do_group($token->[1]) if (get_yn_maybe($token->[2]));
	} elsif (defined($tokenmap{$token->[1]})) {
	    if (get_yn_maybe($token->[2])) {
		do {
		    do_line($token->[1], $tokenmap{$token->[1]});
		} until ($token->[0] ne "multiple" ||
			 get_answer($term, "Do another $token->[1] line?",
				    valid_answers(qw(yes y no n)), 'y')
			 =~ /n/);
	    }
	} elsif (defined($filetypes{$token->[1]})) {
	    $didfile{$token->[1]} = 1;
	} else {
	    die "invalid member $token->[1] of group $group\n";
	}
    }
}

#
# build a particular type of file by operating on sections
#
sub build_file {
    my ($term, $filename, $fileconf) = @_;
    $didfile{$filename} = 1;
    my (@lines);
    while(1) {
	my $line = display_menu(-head => "The configuration information which can be put into $filename is divided\ninto sections.  Select a configuration section for $filename\nthat you wish to create:\n",
				-otheranswers => ['finished'],
				-mapanswers => { 'f' => 'finished' },
				-question => "Select section",
				-numeric => 1,
				map { $_->{'title'}[0] } @$fileconf);

	return @lines if ($line eq "finished");
	do_section($fileconf->[$line-1]);
    }
}

#
# configure a particular section by operating on token types
#
sub do_section {
    my $confsect = shift;
    my @lines;
    while(1) {
	Print ("\nSection: $confsect->{'title'}[0]\n");
	Print ("Description:\n");
	Print ("  ", join("\n  ",@{$confsect->{'description'}}),"\n");
	my $line =
	    display_menu(-head => "Select from:\n",
			 -otheranswers => ['finished','list'],
			 -mapanswers => { 'f' => 'finished',
					  'l' => 'list' },
			 -question => 'Select section',
			 -descriptions => [map { $confsect->{$_}{info}[0] } 
					   @{$confsect->{'thetokens'}}],
			 @{$confsect->{'thetokens'}});
	return @lines if ($line eq "finished");
	if ($line eq "list") {
	    print "Lines defined for section \"$confsect->{title}[0]\" so far:\n";
	    foreach my $i (@{$confsect->{'thetokens'}}) {
		if ($#{$confsect->{$i}{'results'}} >= 0) {
		    print "  ",join("\n  ",@{$confsect->{$i}{'results'}}),"\n";
		}
	    }
	    next;
	}
	do_line($line, $confsect->{$line});
    }
    return;
}

#
# Ask all the questions related to a particular line type
#
sub do_line {
    my $token = shift;
    my $confline = shift;
    my (@answers, $counter, $i);
#    debug(my_Dumper($confline));
    Print ("\nConfiguring: $token\n");
    Print ("Description:\n  ",join("\n    ",@{$confline->{'info'}}),"\n\n");
    for($i=0; $i <= $#{$confline->{'question'}}; $i++) {
	if (defined($confline->{'question'}[$i]) &&
	    $confline->{'question'}[$i] ne "") {
	    my $q = $confline->{'question'}[$i];
	    $q =~ s/\$(\d+)/$answers[$1]/g;
	    debug("after: $term, $q, ",$confline->{'validanswer'}[$i],"\n");
	    $answers[$i] = get_answer($term, $q,
				      $confline->{'validanswer'}[$i]);
	    $answers[$i] =~ s/\"/\\\"/g;
	    $answers[$i] = '"' . $answers[$i] . '"' if ($answers[$i] =~ /\s/);
	}
    }
    if ($#{$confline->{'line'}} == -1) {
	my ($i,$line);
	for($i=0; $i <= $#{$confline->{'question'}}; $i++) {
	    next if (!defined($confline->{'question'}[$i]) ||
		     $confline->{'question'}[$i] eq "");
	    $line .= " \$" . $i;
	}
	push @{$confline->{'line'}}, $line;
    }

    foreach my $line (@{$confline->{'line'}}) {
	my $finished = $line;
	debug("preline: $finished\n");
	debug("answers: ",my_Dumper(\@answers));
	$finished =~ s/\$(\d+)/$answers[$1]/g;
	if ($line =~ s/^eval\s+//) {
	    debug("eval: $finished\n");
	    $finished = eval $finished;
	    debug("eval results: $finished\n");
	}
	$finished = $token . " " . $finished;
	Print ("\nFinished Output: $finished\n");
	push @{$confline->{'results'}},$finished;
    }
}

#
# read all sets of config files in the various subdirectories.
#
sub read_config_files {
    my $readdir = shift;
    my $filetypes = shift;
    opendir(DH, $readdir) || die "no such directory $readdir, did you run make install?\n";
    my $dir;
    my $configfilename="snmpconf-config";

    while(defined($dir = readdir(DH))) {
	next if ($dir =~ /^\./);
	next if ($dir =~ /CVS/);
	debug("dir entry: $dir\n");
	if (-d "$readdir/$dir" && -f "$readdir/$dir/$configfilename") {

	    my $conffile;

	    # read the top level configuration inforamation about the direcotry.
	    open(I, "$readdir/$dir/$configfilename");
	    while(<I>) {
		$conffile = $1 if (/forconffile: (.*)/);
	    }
	    close(I);

	    # no README informatino.
	    if ($conffile eq "") {
		print STDERR "Warning: No 'forconffile' information in $readdir/$dir/$configfilename\n";
		next;
	    }

	    # read all the daat in the directory
	    $filetypes->{$conffile} = read_config_items("$readdir/$dir", $conffile);
	} else {
	    # no README informatino.
	    print STDERR "Warning: No $configfilename file found in $readdir/$dir\n";
	}
    }
    closedir DH;
}

#
# read each configuration file in a directory
#
sub read_config_items {
    my $itemdir = shift;
    my $type = shift;
    opendir(ITEMS, $itemdir);
    my $file;
    my @results;
    while(defined($file = readdir(ITEMS))) {
	next if ($file =~ /~$/);
	next if ($file =~ /^snmpconf-config$/);
	if (-f "$itemdir/$file") {
	    my $res = read_config_item("$itemdir/$file", $type);
	    if (scalar(keys(%$res)) > 0) {
		push @results, $res;
	    }
	}
    }
    closedir(ITEMS);
    return \@results;
}

#
# mark a list of tokens as a special "group"
#
sub read_config_group {
    my ($fh, $group, $type) = @_;
    my $line;
    debug("handling group $group\n");
    push (@{$groups{$group}},['filetype', $type]);
    while($line = <$fh>) {
	chomp($line);
	next if ($line =~ /^\s*$/);
	next if ($line =~ /^\#/);
	return $line if ($line !~ /^(single|multiple|message|filetype|subgroup)/);
	my ($type, $token, $rest) = ($line =~ /^(\w+)\s+([^\s]+)\s*(.*)/);
	debug ("reading group $group : $type -> $token -> $rest\n");
	push (@{$groups{$group}}, [$type, $token, $rest]);
    }
    return;
}
	

#
# Parse one file
#
sub read_config_item {
    my $itemfile = shift;
    my $itemcount;
    my $type = shift;
    my $fh = new IO::File($itemfile);
    return if (!defined($fh));
    my (%results, $curtoken);
    debug("tokenitems:  ", my_Dumper(\%tokenitems));
  topwhile:
    while($line = <$fh>) {
	next if ($line =~ /^\s*\#/);
	my ($token, $rest) = ($line =~ /^(\w+)\s+(.*)/);
	next if (!defined($token) || !defined($rest));
	while ($token eq 'group') {
	    # handle special group list
	    my $next = read_config_group($fh, $rest,$type);
	    if ($next) {
		($token, $rest) = ($next =~ /^(\w+)\s+(.*)/);
	    } else {
		next topwhile;
	    }
	}
	debug("token: $token => $rest\n");
	if ($token eq 'steal') {
	    foreach my $stealfrom (keys(%{$results{$rest}})) {
		if (!defined($results{$curtoken}{$stealfrom})) {
		    @{$results{$curtoken}{$stealfrom}} = 
			@{$results{$rest}{$stealfrom}};
		}
	    }
	} elsif (defined($tokenitems{$token})) {
	    if (!defined($curtoken)) {
		die "error in configuration file $itemfile, no token set\n";
	    }
	    $rest =~ s/^\#//;
	    push @{$results{$curtoken}{$token}},$rest;
	} elsif (defined($arrayitems{$token})) {
	    if (!defined($curtoken)) {
		die "error in configuration file $itemfile, no token set\n";
	    }
	    my ($num, $newrest) = ($rest =~ /^(\d+)\s+(.*)/);
	    if (!defined($num) || !defined($newrest)) {
		warn "invalid config line: $line\n";
	    } else {
		$results{$curtoken}{$token}[$num] = $newrest;
	    }
	} elsif ($token =~ /^token\s*$/) {
	    $rest = lc($rest);
	    $curtoken = $rest;
	    if (! exists $results{$curtoken}{'defined'}) {
		push @{$results{'thetokens'}}, $curtoken;
		$results{$curtoken}{'defined'} = 1;
	    }
	    $tokenmap{$curtoken} = $results{$curtoken};
	    debug("current token set to $token\n");
	} else {
	    push @{$results{$token}},$rest;
	}
    }
    return \%results;
}

sub debug {
    print @_ if ($opts{'d'});
}

sub output_files {
    my $filetypes = shift;
    my $term = shift;
    foreach my $ft (keys(%$filetypes)) {
	next if (!$didfile{$ft});
	my $outputf = $ft;
	if (-f $outputf && !$opts{'f'}) {
	    print "\nError: An $outputf file already exists in this directory.\n\n";
	    my $ans = get_answer($term,"'overwrite', 'skip', 'rename' or 'append'? ",valid_answers(qw(o overwrite r rename s skip a append)));
	    next if ($ans =~ /^(s|skip)$/i);
	    if ($ans =~ /^(a|append)/) {
		$outputf = ">$outputf";
	    } elsif ($ans =~ /^(r|rename)$/i) {
		# default to rename for error conditions
		$outputf = $term->readline("Save to what new file name instead (or 'skip')? ");
	    }
	}
	$didfile{$ft} = $outputf;
	open(O,">$outputf") || warn "couldn't write to $outputf\n";
	print O "#" x 75,"\n";
	print O "#\n# $ft\n";
	print O "#\n#   - created by the snmpconf configuration program\n#\n";
	foreach my $sect (@{$filetypes->{$ft}}) {
	    my $secthelp = 0;
	    foreach my $token (@{$sect->{'thetokens'}}) {
		if ($#{$sect->{$token}{'results'}} >= 0) {
		    if ($secthelp++ == 0) {
			print O "#" x 75,"\n# SECTION: ",
			join("\n#          ", @{$sect->{title}}), "\n#\n";
			print O "#   ", join("\n#   ",@{$sect->{description}}),
			"\n";
		    }
		    print O "\n# $token: ",
		    join("\n#   ",@{$sect->{$token}{info}}), "\n\n";
		    foreach my $result (@{$sect->{$token}{'results'}}) {
			print O "$result\n";
		    }
		}
	    }
	    print O "\n\n\n";
	}
	if ($#{$unknown{$ft}} > -1) {
	    print O "#\n# Unknown directives read in from other files by snmpconf\n#\n";
	    foreach my $unknown (@{$unknown{$ft}}) {
		print O $unknown,"\n";
	    }
	}
	close(O);
    }
}

sub get_answer {
    my ($term, $question, $regexp, $defaultval) = @_;
    $question .= " (default = $defaultval)" if (defined($defaultval) && $defaultval ne "");
    $question .= ": ";
    my $ans = $term->readline($question);
    return $defaultval if ($ans eq "" && defined($defaultval) && 
			   $defaultval ne "");
    while (!(!defined($regexp) ||
	     $regexp eq "" ||
	     $ans =~ /$regexp/)) {
	print "invalid answer!  It must match this regular expression: $regexp\n";
	$ans = $term->readline($question);
    }
    return $defaultval if ($ans eq "" && defined($defaultval) && 
			   $defaultval ne "");
    return $ans;
}
    
sub valid_answers {
    my @list;
    foreach $i (@_) {
	push @list, $i if ($i);
    }
    return "^(" . join("|",@list) . ")\$";
}

sub read_config {
    my $file = shift;
    my $filetype = shift;
    return if (!defined($filetypes{$filetype}));
    if (! -f $file) {
	warn "$file does not exist\n";
	return;
    }
    open(I,$file);
    while(<I>) {
	next if (/^\s*\#/);
	next if (/^\s*$/);
	chomp;
	my ($token, $rest) = /^\s*(\w+)\s+(.*)/;
	$token = lc($token);
	next if (defined($alllines{$_})); # drop duplicate lines
	if (defined($tokenmap{$token})) {
	    push @{$tokenmap{$token}{'results'}},$_;
	} else {
	    push @{$unknown{$filetype}},$_;
	}
	$alllines{$_}++;
    }
    close(I);
}

sub display_menu {
    my %config;

    while ($#_ > -1 && $_[0] =~ /^-/) {
	my $key = shift;
	$config{$key} = shift;
    }

    my $count=1;
    print "\n" if (!defined($config{'-dense'}));
    if ($config{'-head'}) {
	print $config{'-head'};
	print "\n" if (!defined($config{'-dense'}));
    }
    my @answers = @_;
    my @list;
    if (defined($config{'-descriptions'}) && 
	ref($config{'-descriptions'}) eq "ARRAY") {
	@list = @{$config{'-descriptions'}}
    } else {
	@list = @_;
    }
    foreach my $i (@list) {
	printf "  %2d:  $i\n", $count++ if ($i);
    }
    print "\n" if (!defined($config{'-dense'}));
    if (defined($config{'-otheranswers'})) {
	if (ref($config{'-otheranswers'}) eq 'ARRAY') {
	    print "Other options: ", join(", ",
					  @{$config{'-otheranswers'}}), "\n";
	    push @answers, @{$config{'-otheranswers'}};
	    push @answers, keys(%{$config{'-mapanswers'}});
	} else {
	    my $maxlen = 0;
	    push @answers,keys(%{$config{'-otheranswers'}});
	    foreach my $i (keys(%{$config{'-otheranswers'}})) {
		$maxlen = length($i) if (length($i) > $maxlen);
	    }
	    foreach my $i (keys(%{$config{'-otheranswers'}})) {
		printf("  %-" . $maxlen . "s: %s\n", $i, 
		       $config{'-otheranswers'}{$i});
	    }
	}
	print "\n" if (!defined($config{'-dense'}));
    }
    if ($config{'-tail'}) {
	print $config{'-tail'};
	print "\n" if (!defined($config{'-dense'}));
    }

    if (defined($config{'-question'})) {
	while(1) {
	    my $numexpr;
	    if ($config{'-multiple'}) {
		$numexpr = '[\d\s,]+|all|a|none|n';
	    } else {
		$numexpr = '\d+';
	    }
	    push @answers,"" if ($config{'-defaultvalue'});
	    $ans = get_answer($term, $config{'-question'},
			      valid_answers($numexpr,@answers),
			      $config{'-defaultvalue'});
	    if ($config{'-mapanswers'}{$ans}) {
		$ans = $config{'-mapanswers'}{$ans};
	    }

	    if ($ans =~ /^$numexpr$/) {
		if ($config{'-multiple'}) {
		    my @list = split(/\s*,\s*/,$ans);
		    my @ret;
		    $count = 0;
		    foreach my $i (@_) {
			$count++;
			if ($ans eq "all" || $ans eq "a" 
			    || grep(/^$count$/,@list)) {
			    push @ret, $i;
			}
		    }
		    return @ret;
		} else {
		    if ($ans <= 0 || $ans > $#_+1) {
			warn "invalid selection: $ans [must be 1-" .
			    ($#_+1) . "]\n";
		    } else {
			return $ans if ($config{'-numeric'});
			$count = 0;
			foreach my $i (@_) {
			    $count++;
			    if ($ans eq $count) {
				return $i;
			    }
			}
		    }
		}
	    } else {
		return $ans;
	    }
	}
    }
}

sub my_Dumper {
    if ($opts{'D'}) {
	return Dumper(@_);
    } else {
	return "\n";
    }
}

sub get_persistentDir {
    my $file = shift;
    my $result = 0;
    if (! -f $file) {
	return 0;
    }
    open(I,$file);
    while(<I>) {
	next if (/^\s*\#/);
	next if (/^\s*$/);
	chomp;
	my ($token, $rest) = /^\s*(\w+)\s+(.*)/;
        if (lc($token) eq "persistentdir") {
          $result = $rest;
        }
        next;
    }
    close(I);
    return $result;
}

# Usage:   &win32_reg_read("key", "value")
# Example: &win32_reg_read("SOFTWARE\\Net-SNMP","SNMPSHAREPATH");
# Returns: Value if found in HKCU or HCLM.  Otherwise an empty string.
sub win32_reg_read {
  my $sub_key = shift;
  my $value = shift;

  require Win32::Registry;
   
  my ($hkey, %key_values, $temp, $no_warn);
 
  # Try HKCU first
  $no_warn = $HKEY_CURRENT_USER;
  if ($HKEY_CURRENT_USER->Open($sub_key, $hkey))
  {
    $hkey->GetValues(\%key_values);   
    foreach $temp (sort keys %key_values) {
      if ($temp eq $value) {
        return $key_values{$temp}[2];
      }
    }
    $hkey->Close(); 
  }

  # Try HKLM second
  $no_warn = $HKEY_LOCAL_MACHINE;
  if ($HKEY_LOCAL_MACHINE->Open($sub_key, $hkey))
  {
    $hkey->GetValues(\%key_values);
    foreach $temp (sort keys %key_values) {
      if ($temp eq $value) {
        return $key_values{$temp}[2];
      }
    }
    $hkey->Close(); 
  }
  return "";
}

# Usage:   &my_getenv("key")
# Example: &my_getenv("SNMPSHAREPATH");
# Returns: Unix:  Environment variable value (undef if not defined)
#          Win32: HKCU\Software\Net-SNMP\(key) or
#          Win32: HKLM\Software\Net-SNMP\(key) or
#          Win32: Environment variable value (undef if not defined)
sub my_getenv {
  my $key = shift;
  
  # Unix
  if ($^O ne 'MSWin32') {
    return $ENV{$key};
  }
  # Windows
  else {
    my $temp = &win32_reg_read("SOFTWARE\\Net-SNMP","$key");
    if ($temp ne "") {
      return $temp;
    }
    else {
      return $ENV{$key};
    }
  }
}