File Coverage

blib/lib/MD5Check.pm

Criterion	Covered	Total	%
statement	12	57	21.0
branch	0	36	0.0
condition	0	6	0.0
subroutine	4	7	57.1
pod	0	3	0.0
total	16	109	14.6

package MD5Check;

use strict;
use warnings;
use utf8;
use Digest::MD5;
require Exporter;

our @ISA    = qw(Exporter);
our @EXPORT = qw(md5init md5check);

=head1 NAME

MD5Check -  Use it for init Web files's md5 values of your site(or other dir), and check if it changed!

检查web目录（或者其他重要系统目录）md5值，当目录文件变化提醒。用于文件防篡改。

=head1 VERSION

Version 0.06

=cut

our $VERSION = '0.07';

=head1 SYNOPSIS

    use MD5Check;

## 初始化目录md5值,参数为要监控的目录

    my $mydir=shift;
    print md5init($mydir);

## 对目录文件进行检查，只需输入之前保存的md5 文件值。

    use MD5Check;
    my $mydir=shift;
    print md5check($mydir);

# oneliner，perl单行程序实现功能。

需要安装该模块，简单通过 cpanm MD5Check 安装。

## 相关实例可以直接使用bin/下的init.pl 和 check.pl 单行执行

    $ perl -MMD5Check -e 'print md5init("/web")' >file
    $ perl -MMD5Check -e 'print md5check(file) perl -MMD5Check -e 'md5check(file)'..


=cut

my $DEBUG = 0;

sub md5_sum {

    my ( $file_name, $mode ) = @_;
    my ( $FD, $ctx, $md5 );
    eval {open( $FD, $file_name ) or warn  "Can't open $file_name !";
    #$ctx = Digest::MD5->new;
    #binmode($FD) if $mode;
    #$ctx->addfile($FD) or warn "$!\n";
    #$md5 = $ctx->hexdigest;
     };
   unless($@) {
    $ctx = Digest::MD5->new;
    binmode($FD) if $mode;
    $ctx->addfile($FD) or warn "$!\n";
    $md5 = $ctx->hexdigest;
   close $FD if $FD;
   return $md5;
   }
}

sub md5check {
    my $file = shift;
    open( my $fd, '<', $file ) or warn "$file: $!\n";
    my $res .= $file . "\n";
    while (<$fd>) {
        my ( $name, $sum ) = split /\s+/;
        $name =~ s/^\*//;
        if ( $sum eq md5_sum( $name, 1 ) ) {
            $res .= "$name OK\n";
        }
        else {
            $res .= "$name FAILED\n";
        }
    }

    close $fd;

    return $res;
}

# 遍历目录计算md5值
sub md5init {

    my $fd = shift;
    my $res;
    if ( -f $fd ) {
        if ( -T $fd ) {

            #print "按照文本模式进行计算MD5!\n";
           my $md5value = md5_sum( $fd, 0 );
            return "$fd\t$md5value\n" if $md5value ;
        }
        elsif ( -B $fd ) {

            #print "二进制文件用binmod计算MD5!\n";
            my $md5value = md5_sum( $fd, 1 );
            return "$fd\t$md5value\n" if $md5value;
        }
        else {
            #print "其他文件，按照bimmod计算!\n";
            my $md5value = md5_sum( $fd, 1 );
           return "$fd\t$md5value\n" if $md5value;
        }
    }
    elsif ( -d $fd ) {
        my $file_md5;
        print "init for all files $fd:\n";
        opendir( my $DH, $fd ) or warn "Can't open dir $fd: $!";
        for ( readdir $DH ) {
            my $file = $fd . '/' . $_;
            # 上级目录..，本目录. 以及连接文件跳过
            next if ( $file =~ m{/.$} || $file =~ m{/..$} || -l $file );
            eval {$res .= md5init($file);};
            if ($@) {
              print "some wron for init $file\n ";
            }
            print "Debug::", $res if $DEBUG;
        }
        closedir $DH;
    }
    return $res;
}

1;
__END__