#!/usr/bin/perl --
##  $Revision: 7137 $
##  Sanity-check the configuration of an INN system
##  by Brendan Kehoe <brendan@cygnus.com> and Rich $alz.

require "/usr/local/news/lib/innshellvars.pl" ;

$ST_MODE = 2;
$ST_UID  = 4;
$ST_GID  = 5;

$newsuser = 'news';
$newsgroup = 'news';

##  We use simple names, mapping them to the real filenames only when
##  we actually need a filename.
%paths = (
    'active',		"$inn::pathdb/active",
    'archive',		"$inn::patharchive",
    'badnews',		"$inn::pathincoming/bad",
    'batchdir',		"$inn::pathoutgoing",
    'control.ctl',	"$inn::pathetc/control.ctl",
    'ctlprogs',		"$inn::pathcontrol",
    'expire.ctl',	"$inn::pathetc/expire.ctl",
    'history',		"$inn::pathdb/history",
    'incoming.conf',	"$inn::pathetc/incoming.conf",
    'inews',		"$inn::pathbin/inews",
    'inn.conf',		"$inn::pathetc/inn.conf",
    'innd',		"$inn::pathbin/innd",
    'innddir',		"$inn::pathrun",
    'inndstart',	"$inn::pathbin/inndstart",
    'moderators',	"$inn::pathetc/moderators",
    'most_logs',	"$inn::pathlog",
    'newsbin',		"$inn::pathbin",
    'newsboot',		"$inn::pathbin/rc.news",
    'newsfeeds',	"$inn::pathetc/newsfeeds",
    'overview.fmt',	"$inn::pathetc/overview.fmt",
    'newsetc',		"$inn::pathetc",
    'newslib',		"/usr/local/news/lib",
    'nnrpd',		"$inn::pathbin/nnrpd",
    'nntpsend.ctl',	"$inn::pathetc/nntpsend.ctl",
    'oldlogs',		"$inn::pathlog/OLD",
    'passwd.nntp',	"$inn::pathetc/passwd.nntp",
    'readers.conf',	"$inn::pathetc/readers.conf",
    'rnews',		"$inn::pathbin/rnews",
    'rnewsprogs',	"$inn::pathbin/rnews.libexec",
    'spooltemp',	"$inn::pathtmp",
    'spool',		"$inn::patharticles",
    'spoolnews',	"$inn::pathincoming"
);

##  The sub's that check the config files.
%checklist = (
    'active',		'active',
    'control.ctl',	'control_ctl',
    'expire.ctl',	'expire_ctl',
    'incoming.conf',	'incoming_conf',
    'inn.conf',		'inn_conf',
    'moderators',	'moderators',
    'newsfeeds',	'newsfeeds',
    'overview.fmt',	'overview_fmt',
    'nntpsend.ctl',	'nntpsend_ctl',
    'passwd.nntp',	'passwd_nntp',
    'readers.conf',	'readers_conf'
);

##  The modes of the config files we can check.
%modes = (
    'active',		0664,
    'control.ctl',	0640,
    'expire.ctl',	0640,
    'incoming.conf',	0640,
    'inn.conf',		0644,
    'moderators',	0644,
    'newsfeeds',	0644,
    'overview.fmt',	0644,
    'nntpsend.ctl',	0640,
    'passwd.nntp',	0640,
    'readers.conf',	0640
);


sub
spacious
{
    local ($i);

    chop;
    study;
    if ( /^#/ || /^$/ ) {
	$i = 1;
    } elsif ( /^\s/ ) {
	print "$file:$line: starts with whitespace\n";
	$i = 1;
    } elsif ( /\s$/ ) {
	print "$file:$line: ends with whitespace\n";
	$i = 1;
    }
    $i;
}

##
##  These are the functions that verify each individual file, called
##  from the main code.  Each function gets <IN> as the open file, $line
##  as the linecount, and $file as the name of the file.
##


##
##  active
##
sub
active
{
    local ($group, $hi, $lo, $f, $alias, %groups, %aliases);

    input: while ( <IN> ) {
	$line++;
	unless ( ($group, $hi, $lo, $f) = /^([^ ]+) (\d+) (\d+) (.+)\n$/ ) {
	    print "$file:$line: malformed line.\n";
	    next input;
	}

	print "$file:$line: group `$group' already appeared\n"
	    if $groups{$group}++;
	print "$file:$line: `$hi' <  '$lo'.\n"
	    if $hi < $lo && $lo != $hi + 1;

	next input if $f =~ /^[jmynx]$/;
	unless ( ($alias) = $f =~ /^=(.*)$/ ) {
	    print "$file:$line: bad flag `$f'.\n";
	    next input;
	}
	if ($alias eq "") {
	    print "$file:$line: empty alias.\n";
	    next input;
	}
	$aliases{$alias} = $line
	    unless defined $groups{$alias};
    }
    foreach $key ( keys %aliases ) {
	print "$file:$aliases{$group} aliased to unknown group `$key'.\n"
	    unless defined $groups{$key};
    }
    1;
}


##
##  control.ctl
##
%control'messages = (
    'all',		1,
    'checkgroups',	1,
    'ihave',		1,
    'newgroup',		1,
    'rmgroup',		1,
    'sendme',		1,
    'sendsys',		1,
    'senduuname',	1,
    'version',		1,
);
%control'actions = (
    'drop',		1,
    'log',		1,
    'mail',		1,
    'doit',		1,
    'doifarg',		1,
    'verify',           1
);

sub
control_ctl
{
    local ($msg, $from, $ng, $act);

    input: while ( <IN> ) {
	next input if &spacious($file, ++$line);

	unless ( ($msg, $from, $ng, $act) =
		    /^([^:]+):([^:]+):([^:]+):(.+)$/ ) {
	    print "$file:$line: malformed line.\n";
	    next input;
	}
	if ( !defined $control'messages{$msg} ) {
	    print "$file:$line: unknown control message `$msg'.\n";
	    next input;
	}
	print "$file:$line: action for unknown control messages is `doit'.\n"
	    if $msg eq "default" && $act eq "doit";
	print "$file:$line: empty from field.\n"
	    if $from eq "";
	print "$file:$line: bad email address.\n"
	    if $from ne "*" && $from !~ /[@!]/;

	##  Perhaps check for conflicting rules, or warn about the last-match
	##  rule?  Maybe later...
	print "$file:$line: may not match groups properly.\n"
	    if $ng ne "*" && $ng !~ /\./;
	if ( $act !~ /([^=]+)(=.+)?/ ) {
	    print "$file:$line: malformed line.\n";
	    next input;
	}
	$act =~ s/=.*//;
	$act = "verify" if ($act =~ /^verify-.+/) ;
	print "$file:$line: unknown action `$act'\n"
	    if !defined $control'actions{$act};
    }
    1;
}


##
##  expire.ctl
##
sub
expire_ctl
{
    local ($rem, $v, $def, $class, $pat, $flag, $keep, $default, $purge, $groupbaseexpiry);

    $groupbaseexpiry = $inn::groupbaseexpiry;
    $groupbaseexpiry =~ tr/A-Z/a-z/;
    input: while ( <IN> ) {
	next input if &spacious($file, ++$line);

	if ( ($v) = m@/remember/:(.+)@ ) {
	    print "$file:$line: more than one /remember/ line.\n"
		if $rem++;
	    if ( $v !~ /[\d\.]+/ ) {
		print "$file:$line: illegal value `$v' for remember.\n";
		next input;
	    }
	    print "$file:$line: are you sure about your /remember/ value?\n"
		##  These are arbitrary "sane" values.
		if $v != 0 && ($v > 60.0 || $v < 5.0);
	    next input;
	}

	##  Could check for conflicting lines, but that's hard.
	if ($groupbaseexpiry =~ /^true$/ || $groupbaseexpiry =~ /^yes$/ ||
	    $groupbaseexpiry =~ /^on$/) {
	    unless ( ($pat, $flag, $keep, $default, $purge) =
	     /^([^:])+:([^:]+):([\d\.]+|never):([\d\.]+|never):([\d\.]+|never)$/ ) {
		print "$file:$line: malformed line.\n";
		next input;
	    }
	    print "$file:$line: duplicate default line\n"
		if $pat eq "*" && $flag eq "a" && $def++;
	    print "$file:$line: unknown modflag `$flag'\n"
		if $flag !~ /[mMuUaAxX]/;
	} else {
	    unless ( ($class, $keep, $default, $purge) =
	     /^(\d+):([\d\.]+|never):([\d\.]+|never):([\d\.]+|never)$/ ) {
		print "$file:$line: malformed line.\n";
		next input;
	    }
	    print "$file:$line: invalid class\n"
		if $class < 0;
	}
	print "$file:$line: purge `$purge' younger than default `$default'.\n"
	    if $purge ne "never" && $default > $purge;
	print "$file:$line: default `$default' younger than keep `$keep'.\n"
	    if $default ne "never" && $keep ne "never" && $keep > $default;
    }
    1;
}


##
##  incoming.conf
##
sub
incoming_conf
{
    1;
}


##
##  inn.conf
##
sub
inn_conf
{
    system ("$inn::pathbin/innconfval", '-C');

#    if ( $k eq "domain" ) {
#        print "$file:$line: domain (`$v') isn't local domain\n"
#            if $fqdn =~ /[^\.]+\(\..*\)/ && $v ne $1;
#        print "$file:$line: domain should not have a leading period\n"
#            if $v =~ /^\./;
#    } elsif ( $k eq "fromhost" ) {
#        print "$file:$line: fromhost isn't a valid FQDN\n"
#            if $v !~ /[\w\-]+\.[\w\-]+/;
#    } elsif ( $k eq "moderatormailer" ) {
#        # FIXME: shouldn't warn about blank lines if the
#        # moderators file exists
#        print "$file:$line: moderatormailer has bad address\n"
#            if $v !~ /[\w\-]+\.[\w\-]+/ && $v ne "%s";
#    } elsif ( $k eq "organization" ) {
#        print "$file:$line: org is blank\n"
#            if $v eq "";
#    } elsif ( $k eq "pathhost" ) {
#        print "$file:$line: pathhost has a ! in it\n"
#            if $v =~ /!/;
#    } elsif ( $k eq "pathalias" ) {
#        print "$file:$line: pathalias has a ! in it\n"
#            if $v =~ /!/;
#    } elsif ( $k eq "server" ) {
#        print "$file:$line: server (`$v') isn't local hostname\n"
#            if $pedantic && $fqdn !~ /^$v/;
#    }
#
#    if ( $key eq "moderatormailer" ) {
#        printf "$file:$line: missing $key and no moderators file.\n"
#            if ! -f $paths{"moderators"};
#    }

    1;
}


##
##  moderators
##
sub
moderators
{
    local ($k, $v);

    input: while ( <IN> ) {
	next input if &spacious($file, ++$line);

	unless ( ($k, $v) = /^([^:]+):(.+)$/ ) {
	    print "$file:$line: malformed line.\n";
	    next input;
	}

	if ( $k eq "" || $v eq "" ) {
	    print "$file:$line: missing field\n";
	    next input;
	}
	print "$file:$line: not an email address\n"
	    if $pedantic && $v !~ /[@!]/;
	print "$file:$line: `$v' goes to local address\n"
	    if $pedantic && $v eq "%s";
	print "$file:$line: more than one %s in address field\n"
	    if $v =~ /%s.*%s/;
    }
    1;
}


##
##  newsfeeds
##
%newsfeeds'flags = (
    '<',	'^\d+$',
    '>',	'^\d+$',
    'A',	'^[cCdeoOp]+$',
    'B',	'^\d+(/\d+)?$',
    'C',	'^\d+$',
    'F',	'^.+$',
    'G',	'^\d+$',
    'H',	'^\d+$',
    'I',	'^\d+$',
    'N',	'^[mu]$',
    'O',	'^\S+$',
    'P',	'^\d+$',
    'S',	'^\d+$',
    'T',	'^[cflmpx]$',
    'W',	'^[befghmnpst*DGHNPOR]*$',
);

sub
newsfeeds
{
    local ($next, $start, $me_empty, @muxes, %sites);
    local ($site, $pats, $dists, $flags, $param, $type, $k, $v, $defsub);
    local ($bang, $nobang, $prog, $dir);

    input: while ( <IN> ) {
	$line++;
	next input if /^$/;
	chop;
	print "$file:$line: starts with whitespace\n"
	    if /^\s+/;

	##  Read continuation lines.
	$start = $line;
	while ( /\\$/ ) {
	    chop;
	    chop($next = <IN>);
	    $line++;
	    $next =~ s/^\s*//;
	    $_ .= $next;
	}
	next input if /^#/;
	print "$file:$line: ends with whitespace\n"
	    if /\s+$/;

        # Catch a variable setting.
        if ( /^\$([A-Za-z0-9]+)=/ ) {
            print "$file:$line: variable name too long\n"
                if length ($1) > 31;
            next input;
        }

	unless ( ($site, $pats, $flags, $param) =
		    /^([^:]+):([^:]*):([^:]*):(.*)$/ ) {
	    print "$file:$line: malformed line.\n";
	    next input;
	}

	print "$file:$line: Newsfeed `$site' has whitespace in its name\n"
	    if $site =~ /\s/;
	print "$file:$line: comma-space in site name\n"
	    if $site =~ m@, @;
	print "$file:$line: comma-space in subscription list\n"
	    if $pats =~ m@, @;
	print "$file:$line: comma-space in flags\n"
	    if $flags =~ m@, @;

	print "$file:$start: ME has exclusions\n"
	    if $site =~ m@^ME/@;
	print "$file:$start: multiple slashes in exclusions for `$site'\n"
	    if $site =~ m@/.*/@;
	$site =~ s@([^/]*)/.*@$1@;
	print "$site, "
	    if $verbose;

	if ( $site eq "ME" ) {
	    $defsub = $pats;
	    $defsub =~ s@(.*)/.*@$1@;
	} elsif  ( $defsub ne "" ) {
	    $pats = "$defsub,$pats";
	}
	print "$file:$start: Multiple slashes in distribution for `$site'\n"
	    if $pats =~ m@/.*/@;

	if ( $site eq "ME" ) {
	    print "$file:$start: ME flags should be empty\n"
		if $flags ne "";
	    print "$file:$start: ME param should be empty\n"
		if $param ne "";
	    $me_empty = 1
		if $pats !~ "/.+";
	}

	##  If we don't have !junk,!control, give a helpful warning.
#	if ( $site ne "ME" && $pats =~ /!\*,/ ) {
#	    print "$file:$start: consider adding !junk to $site\n"
#		if $pats !~ /!junk/;
#	    print "$file:$start: consider adding !control to $site\n"
#		if $pats !~ /!control/;
#	}

	##  Check distributions.
	if ( ($dists) = $pats =~ m@.*/(.*)@ ) {
	    $bang = $nobang = 0;
	    dist: foreach $d ( split(/,/, $dists) ) {
		if ( $d =~ /^!/ ) {
		    $bang++;
		}
		else {
		    $nobang++;
		}
		print "$file:$start: questionable distribution `$d'\n"
		    if $d !~ /^!?[a-z0-9-]+$/;
	    }
	    print "$file:$start: both ! and non-! distributions\n"
		if $bang && $nobang;
	}
	$type = "f";
	flag: foreach $flag ( split(/,/, $flags) ) {
	    ($k, $v) = $flag =~ /(.)(.*)/;
	    if ( !defined $newsfeeds'flags{$k} ) {
		print "$file:$start: unknown flag `$flag'\n";
		next flag;
	    }
	    if ( $v !~ /$newsfeeds'flags{$k}/ ) {
		print "$file:$start: bad value `$v' for flag `$k'\n";
		next flag;
	    }
	    $type = $v
		if $k eq "T";
	}

	##  Warn about multiple feeds.
	if ( !defined $sites{$site} ) {
	    $sites{$site} = $type;
	} elsif ( $sites{$site} ne $type ) {
	    print "$file:$start: feed $site multiple conflicting feeds\n";
	}

	if ( $type =~ /[cpx]/ ) {
	    $prog = $param;
	    $prog =~ s/\s.*//;
	    print "$file:$start: relative path for $site\n"
		if $prog !~ m@^/@;
	    print "$file:$start: `$prog' is not executable for $site\n"
		if ! -x $prog;
	}
	if ( $type eq "f" && $param =~ m@/@ ) {
	    $dir = $param;
	    $dir =~ s@(.*)/.*@$1@;
	    $dir = $paths{'batchdir'} . "/" . $dir
		unless $dir =~ m@^/@;
	    print "$file:$start: directory `$dir' does not exist for $site\n"
		if ! -d $dir;
	}

	##  If multiplex target not known, add to multiplex list.
	push(@muxes, "$start: undefined multiplex `$param'")
	    if $type eq "m" && !defined $sites{$param};
    }

    ##  Go through and make sure all referenced multiplex exist.
    foreach (@muxes) {
	print "$file:$_\n"
	    if /`(.*)'/ && !defined $sites{$1};
    }
    print "$file:0: warning you accept all incoming article distributions\n"
	if !defined $sites{"ME"} || $me_empty;

    print "done.\n"
	if $verbose;
    1;
}


##
##  overview.fmt
##
#%overview_fmtheaders = (
#    'Approved',		1,
#    'Bytes',		1,
#    'Control',		1,
#    'Date',		1,
#    'Distribution',	1,
#    'Expires',		1,
#    'From',		1,
#    'Lines',		1,
#    'Message-ID',	1,
#    'Newsgroups',	1,
#    'Path',		1,
#    'References',	1,
#    'Reply-To',		1,
#    'Sender',		1,
#    'Subject',		1,
#    'Supersedes',	1,
#);

sub
overview_fmt
{
    local ($header, $mode, $sawfull);

    $sawfull = 0;
    input: while ( <IN> ) {
	next input if &spacious($file, ++$line);

	unless ( ($header, $mode) = /^([^:]+):([^:]*)$/ ) {
	    print "$file:$line: malformed line.\n";
	    next input;
	}

	#print "$file:$line: unknown header `$header'\n"
	#    if !defined $overview_fmtheaders{$header};
	if ( $mode eq "full" ) {
	    $sawfull++;
	} elsif ( $mode eq "" ) {
	    print "$file:$line: short header `$header' appears after full one\n"
		if $sawfull;
	} else {
	    print "$file:$line: unknown mode `$mode'\n";
	}
    }
    1;
}


##
##  nntpsend.ctl
##
sub
nntpsend_ctl
{
    local ($site, $fqdn, $flags, $f, $v);

    input: while ( <IN> ) {
	next input if &spacious($file, ++$line);

	##  Ignore the size info for now.
	unless ( ($site, $fqdn, $flags) =
		    /^([\w\-\.]+):([^:]*):[^:]*:([^:]*)$/ ) {
	    print "$file:$line: malformed line.\n";
	    next input;
	}
	print "$file:$line: FQDN is empty for `$site'\n"
	    if $fqdn eq "";

	next input if $flags eq "";
	flag: foreach (split(/ /, $flags)) {
	    unless ( ($f, $v) = /^-([adrvtTpSP])(.*)$/ ) {
		print "$file:$line: unknown argument for `$site'\n";
		next flag;
	    }
	    print "$file:$line: unknown argument to option `$f': $flags\n"
		if ( $f eq "t" || $f eq "T" || $f eq "P") && $v !~ /\d+/;
	}
    }
    1;
}


##
##  passwd.nntp
##
sub
passwd_nntp
{
    local ($name, $pass);

    input: while ( <IN> ) {
	next input if &spacious($file, ++$line);

	unless ( ($name, $pass) = /[\w\-\.]+:(.*):(.*)(:authinfo)?$/ ) {
	    next input;
	    print "$file:$line: malformed line.\n";
	}
	print "$file:$line: username/password must both be blank or non-blank\n"
	    if ( $name eq "" && $pass ne "" ) || ($name ne "" && $pass eq "");
    }
    1;
}


##
##  readers.conf
##
sub
readers_conf
{
    1;
}


##
##  Routines to check permissions
##

##  Given a file F, check its mode to be M, and its ownership to be by the
##  user U in the group G.  U and G have defaults.
sub
checkperm
{
    local ($f, $m, $u, $g) = ( @_, $newsuser, $newsgroup);
    local (@sb, $owner, $group, $mode);

    die "Internal error, undefined name in perm from ", (caller(0))[2], "\n"
	if !defined $f;
    die "Internal error, undefined mode in perm from ", (caller(0))[2], "\n"
	if !defined $m;

    if ( ! -e $f ) {
	print "$pfx$f:0: missing\n";
    }
    else {
	@sb = stat _;
	$owner = (getpwuid($sb[$ST_UID]))[0];
	$group = (getgrgid($sb[$ST_GID]))[0];
	$mode  = $sb[$ST_MODE] & ~0770000;

	##  Ignore setgid bit on directories.
	$mode &= ~0777000
	    if -d _;

	if ( $owner ne $u ) {
	    print "$pfx$f:0: owned by $owner, should be $u\n";
	    print "chown $u $f\n"
		if $fix;
	}
	if ( $group ne $g ) {
	    print "$pfx$f:0: in group $group, should be $g\n";
	    print "chgrp $g $f\n"
		if $fix;
	}
	if ( $mode ne $m ) {
	    printf "$pfx$f:0: mode %o, should be %o\n", $mode, $m;
	    printf "chmod %o $f\n", $m
		if $fix;
	}
    }
}

##  Return 1 if the Intersection of the files in the DIR and FILES is empty.
##  Otherwise, report an error for each illegal file, and return 0.
sub
intersect
{
    local ($dir, @files) = @_;
    local (@in, %dummy, $i);

    if ( !opendir(DH, $dir) ) {
	print "$pfx$dir:0: can't open directory\n";
    }
    else {
	@in = grep($_ ne "." && $_ ne "..", readdir(DH));
	closedir(DH);
    }

    $i = 1;
    if ( scalar(@in) ) {
	foreach ( @files ) {
	    $dummy{$_}++;
	}
	foreach ( grep ($dummy{$_} == 0, @in) ) {
	    print "$pfx$dir:0: ERROR: illegal file `$_' in directory\n";
	    $i = 0;
	}
    }
    $i;
}

@directories = (
    'archive', 'badnews', 'batchdir', 'ctlprogs', 'most_logs', 'newsbin',
    'newsetc', 'newslib', 'oldlogs', 'rnewsprogs', 'spooltemp', 'spool', 'spoolnews'
);
@rnews_programs = (
    'c7unbatch', 'decode', 'encode', 'gunbatch'
);
@newsbin_public = (
    'archive', 'batcher', 'buffchan', 'convdate', 'cvtbatch', 'expire',
    'filechan', 'getlist', 'grephistory', 'innconfval', 'innxmit',
    'makehistory', 'nntpget', 'overchan', 'prunehistory', 'shlock',
    'shrinkfile'
);
@newsbin_private = (
    'ctlinnd', 'expirerm', 'inncheck', 'innstat', 'innwatch',
    'news.daily', 'nntpsend', 'scanlogs', 'sendbatch',
    'tally.control', 'writelog',
    'send-ihave', 'send-nntp', 'send-uucp'
);
#@newslib_private_read = (
#    'innlog.pl'
#);

## The modes for the various programs.
%prog_modes = (
    'inews',		 0550,
    'innd',		 0550,
    'newsboot',		 0550,
    'nnrpd',		 0555,
    'rnews',		 0500,
);

##  Check the permissions of nearly every file in an INN installation.
sub
check_all_perms
{
    local ($rnewsprogs) = $paths{'rnewsprogs'};
    local ($newsbin) = $paths{'newsbin'};
    local ($newslib) = $paths{'newslib'};

    foreach ( @directories ) {
	&checkperm($paths{$_}, 0755);
    }
    &checkperm($paths{'innddir'}, 0750);
    foreach ( keys %prog_modes ) {
	&checkperm($paths{$_}, $prog_modes{$_});
    }
    &checkperm($paths{'inndstart'}, 04550, 'root', $newsgroup);
    foreach ( keys %paths ) {
	&checkperm($paths{$_}, $modes{$_})
	    if defined $modes{$_};
    }
    &checkperm($paths{'history'}, 0644);
    # Commented out for now since it depends on the history type.
    #&checkperm($paths{'history'} . ".dir", 0644);
    #&checkperm($paths{'history'} . ".index", 0644);
    #&checkperm($paths{'history'} . ".hash", 0644);
    #foreach ( @newslib_private_read ) {
    #   &checkperm("$newslib/$_", 0440);
    #}
    foreach ( @newsbin_private ) {
	&checkperm("$newsbin/$_", 0550);
    }
    foreach ( @newsbin_public ) {
	&checkperm("$newsbin/$_", 0555);
    }
    foreach ( @rnews_programs ) {
	&checkperm("$rnewsprogs/$_", 0555);
    }

    ##  Also make sure that @rnews_programs are the *only* programs in there;
    ##  anything else is probably someone trying to spoof rnews into being bad.
    &intersect($rnewsprogs, @rnews_programs);

    1;
}


##
##  Parsing, main routine.
##

sub
Usage
{
    local ($i) = 0;

    print "Usage error: @_.\n";
    print
"Usage:
	$program [-v] [-noperm] [-pedantic] [-perms [-fix] ] [-a|file...]
File to check may be followed by \"=path\" to use the specified path.  All
files are checked if -a is used or if -perms is not used.  Files that may
be checked are:\n";
    foreach ( sort(keys %checklist) ) {
	printf "     %-20s", $_;
	if ( ++$i == 3) {
	    print "\n";
	    $i = 0;
	}
    }
    print "\n"
	if $i;
    exit 0;
}


sub
parse_flags
{
    $all = 0;
    $fix = 0;
    $perms = 0;
    $noperms = 0;
    $verbose = 0;
    @todo = ();

    arg: foreach ( @ARGV ) {
	if ( /-a/ ) {
	    $all++;
	    next arg;
	}
	if ( /^-v/ ) {
	    $verbose++;
	    next arg;
	}
	if ( /^-ped/ ) {
	    $pedantic++;
	    next arg;
	}
	if ( /^-f/ ) {
	    $fix++;
	    next arg;
	}
	if ( /^-per/ ) {
	    $perms++;
	    next arg;
	}
	if ( /^-noperm/ ) {
	    $noperms++;
	    next arg;
	}
	if ( /^-/ ) {
	    &Usage("Unknown flag `$_'");
	}
	if ( ($k, $v) = /(.*)=(.*)/ ) {
	    &Usage("Can't check `$k'")
		if !defined $checklist{$k};
	    push(@todo, $k);
	    $paths{$k} = $v;
	    next arg;
	}
	&Usage("Can't check `$_'")
	    if !defined $checklist{$_};
	push(@todo, $_);
    }

    &Usage("Can't use `-fix' without `-perm'")
	if $fix && !$perms;
    &Usage("Can't use `-noperm' with `-perm'")
	if $noperms && $perms;
    $pfx = $fix ? '# ' : '';

    @todo = grep(defined $checklist{$_}, sort(keys %paths))
	if $all || (scalar(@todo) == 0 && ! $perms);
}


$program = $0;
$program =~ s@.*/@@;
$| = 1;
&parse_flags();
action: foreach $workfile ( @todo ) {
    $file = $paths{$workfile};
    if ( ! -f $file ) {
	print "$file:0: file missing\n";
	next action;
    }
    print "Looking at $file...\n"
	if $verbose;
    if ( !open(IN, $file) ) {
	print "$pfx$workfile:0: can't open $!\n";
	next action;
    }
    &checkperm($file, $modes{$workfile})
	if $noperms == 0 && !$perms && defined $modes{$workfile};
    $line = 0;
    eval "&$checklist{$workfile}" || warn "$@";
    close(IN);
}

&check_all_perms()
    if $perms;
exit(0);

if ( 0 ) {
    &active();
    &control_ctl();
    &incoming_conf();
    &expire_ctl();
    &inn_conf();
    &moderators();
    &nntpsend_ctl();
    &newsfeeds();
    &overview_fmt();
    &passwd_nntp();
    &readers_conf();
}
