#!/usr/bin/perl -w
+# checkpasswd-service
+# part of userv-utils
+
+# protocols:
+#
+# userv root checkpasswd-self <<'END'
+# < PASSWORD
+# < ^D
+# > STATUS MESSAGE...
+#
+# userv root checkpasswd-other USERNAME <<'END'
+# < PASSWORD
+# < ^D
+# > STATUS MESSAGE...
+#
+# STATUS MESSAGE may be
+# 0 ok
+# 2 incorrect password
+# 4 no such user
+# 5 password disabled
+
+# Copyright 1996-2013 Ian Jackson <ijackson@chiark.greenend.org.uk>
+# Copyright 1998 David Damerell <damerell@chiark.greenend.org.uk>
+# Copyright 1999,2003
+# Chancellor Masters and Scholars of the University of Cambridge
+# Copyright 2010 Tony Finch <fanf@dotat.at>
+#
+# This is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with userv-utils; if not, see http://www.gnu.org/licenses/.
+
+
use strict;
use IO::File;
use Fcntl qw(:flock);
-die "$0: bad usage\n" unless @ARGV==1 && $ARGV[0] !~ m/^-/;
-my $username = shift @ARGV;
+my ($lockpath, $delay, $separator, $username) = @ARGV;
+
+die "$0: bad usage\n" unless
+ @ARGV == 4 ||
+ $lockpath =~ m#^/# ||
+ $delay =~ m/^[0-9.]+$/ ||
+ $separator eq '--' ||
+ $username =~ m/^\w/;
+
$username = $ENV{'USERV_USER'} if $username eq 'SELF';
sub result {
$!=0; my $pw = <STDIN>;
chomp $pw or die "reading password: $!\n";
-my $lockpath = "/var/run/checkpasswd.synch";
my $lockf = new IO::File $lockpath, "w+" or die "open $lockpath: $!\n";
flock($lockf, LOCK_EX) or die "lock $lockpath: $!\n";
select(undef,undef,undef,0.5);