Current File : //sbin/userdb

#! /usr/bin/perl
#
# Copyright 1998 - 2020 Double Precision, Inc.  See COPYING for
# distribution information.

use Fcntl ':flock';

$prefix="/usr";
$exec_prefix="${prefix}";
$userdb="/etc/courier/userdb";

eval {
	die "SYMLINK\n" if -l $userdb;
};

die "ERROR: Wrong userdb command.\n       ($userdb is a symbolic link)\n"
	if $@ eq "SYMLINK\n";

sub usage {
	print "Usage: $0 [path/.../ | -f file ]name set field=value field=value...\n";
	print "       $0 [path/.../ | -f file ]name unset field field...\n";
	print "       $0 [path/.../ | -f file ]name del\n";
	print "       $0 -show [path/... | -f file ] [name]\n";
	exit 1;
}

$name=shift @ARGV;
$doshow=0;

if ($name eq "-show")
{
	$doshow=1;
	$name=shift @ARGV;
}

if ($name eq "-f")
{
	$userdb=shift @ARGV;
	$name=shift @ARGV;
}
elsif ( $name =~ /^(.*)\/([^\/]*)$/ )
{
	$userdb="$userdb/$1";
	$name=$2;
}


if ($doshow)
{
	&usage unless $userdb =~ /./;
}
else
{
	$verb=shift @ARGV;

	&usage unless $verb =~ /./ && $name =~ /./ && $userdb =~ /./;
}

while (defined ($link= &safe_readlink($userdb)))
{
	$userdb .= "/";
	$userdb = "" if $link =~ /^\//;
	$userdb .= $link;
}

$tmpuserdb= $userdb =~ /^(.*)\/([^\/]*)$/ ? "$1/.tmp.$2":".tmp.$userdb";
$lockuserdb= $userdb =~ /^(.*)\/([^\/]*)$/ ? "$1/.lock.$2":".lock.$userdb";

grep( (/[\|\n]/ && die "Invalid field or value.\n"), @ARGV);

umask(066);

open(LOCK, ">$lockuserdb") or die "Can't open $lockuserdb: $!";
flock(LOCK,LOCK_EX) || die "Can't lock $lockuserdb: $!";

if ( $doshow )
{
	if (open (OLDFILE, $userdb))
	{
		stat(OLDFILE);
		die "$userdb: not a file.\n" unless -f _;

		while ( defined($_=<OLDFILE>) )
		{
			chop if /\n$/;
			next if /^#/;
			next unless /^([^\t]+)(\t(.*))?$/;
			($addr,$vals)=($1,$3);
			if (defined $name)
			{
				if ($name eq $addr)
				{
					$vals =~ s/\|/\n/g;
					print "$vals\n";
					last;
				}
			}
			else
			{
				print "$addr\n";
			}
		}
	}
	close (OLDFILE);
}
elsif ( $verb eq "set" )
{
	$isatty=1;

	eval {
		$isatty=0 unless -t STDIN;
	} ;

	&doadd;
	$mode= (stat $userdb)[2];
	chmod ($mode & 0777,$tmpuserdb ) if defined $mode;
	rename $tmpuserdb,$userdb;
}
elsif ( $verb eq "unset" )
{
	if ($#ARGV >= 0 && &dodel)
	{
		$mode= (stat $userdb)[2];
		chmod ($mode & 0777 ,$tmpuserdb) if defined $mode;
		rename ($tmpuserdb,$userdb)
	}
}
elsif ( $verb eq "del" )
{
	&usage unless $#ARGV < 0;
	if (&dodel)
	{
		$mode= (stat $userdb)[2];
		chmod ($mode & 0777 ,$tmpuserdb) if defined $mode;
		rename ($tmpuserdb,$userdb)
	}
}
else
{
	&usage;
}
exit 0;

sub doadd {
my (%FIELDS);
my ($key, $in);

	foreach $key (@ARGV)
	{
		next if $key =~ /=/;
		print "$name.$key: " if $isatty;
		exit 1 unless defined ($in=<STDIN>);
		chop $in if $in =~ /\n$/;
		die "Invalid value.\n" if $in =~ /[\|\n]/;
		$key = "$key=$in";
	}

	open (NEWFILE, ">$tmpuserdb") || die "$!\n";
	if (open (OLDFILE, $userdb))
	{
		stat(OLDFILE);
		die "$userdb: not a file.\n" unless -f _;
		while ( defined($_=<OLDFILE>) )
		{
			chop if /\n$/;
			if ( /^([^\t]+)(\t(.*))?$/ && ($1 eq $name))
			{
				grep( (/^([^=]*)(=.*)?$/,
					$FIELDS{$1}="$2"), split(/\|/, $3));
				while ( defined ($key=shift @ARGV))
				{
					$key =~ /^([^=]*)(=.*)?$/;
					$FIELDS{$1}="$2";
				}
				$name="$name\t";
				grep ( $name="$name$_$FIELDS{$_}|",
					keys %FIELDS);
				chop $name;
				print NEWFILE "$name\n" || die "$!\n";
				while (<OLDFILE>)
				{
					print NEWFILE || die "$!\n";
				}
				close (OLDFILE);
				close (NEWFILE) || die "$!\n";
				return;
			}
			print NEWFILE "$_\n" || die "$!\n";
		}
		close (OLDFILE);
	}

	$name="$name\t";
	grep ( $name="$name$_|", @ARGV );
	chop $name;
	print NEWFILE "$name\n" || die "$!\n";
	close (NEWFILE) || die "$!\n";
}

sub dodel {
my (%FIELDS);

	open (NEWFILE, ">$tmpuserdb") || die "$!\n";
	if (open (OLDFILE, $userdb))
	{
		stat(OLDFILE);
		die "$userdb: not a file.\n" unless -f _;
		while ( defined($_=<OLDFILE>) )
		{
			chop if /\n$/;
			if ( /^([^\t]+)(\t(.*))?$/ && ($1 eq $name))
			{
				if ($#ARGV >= 0)
				{
					grep( (/^([^=]*)(=.*)?$/,
						$FIELDS{$1}=$2),
							split(/\|/, $3));
					grep( delete $FIELDS{$_}, @ARGV);

					$name="$name\t";
					grep ( $name="$name$_$FIELDS{$_}|",
						keys %FIELDS);
					chop $name;
					$name="$name\n";
					print NEWFILE "$name" || die "$!\n";
				}
				while (<OLDFILE>)
				{
					print NEWFILE || die "$!\n";
				}
				close (OLDFILE);
				close (NEWFILE) || die "$!\n";
				return (1);
			}
			print NEWFILE "$_\n" || die "$!\n";
		}
		close (OLDFILE);
	}
	unlink "$tmpuserdb";
	return (0);
}

sub safe_readlink {
my ($l)=@_;
my ($err,$link);

	eval {

		$link=readlink($l);
	} ;

	$link=undef if $@;
	return $link;
}