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| Submitted on: 3/2/2001 8:16:28 PM
By: Christopher Streva
Level: Intermediate
User Rating:
By 22 Users
Compatibility:VB 6.0
Users have accessed this code 11544 times.
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(About the author) |
| | | The purpose of Block This is to show off one of the many exploits available for poorly coded URL filtering applications/proxies. It is very easy to use and can help anyone who is interested in creating some form of URL blocking program.
In this new version of Block This (v2.0), the code is much smaller than it used to be. It also is easier for someone to understand if they wish to buils a similar application using my code as an example.
If you like this code and you can put it to good use, please vote for it. I spent a long time fixing this code up and nothing would make me feel better than to know that people can make use of it.
Special thanks to Adam Wechsler who was a big help in cleaning up the application!
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1) You may use
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| Your Vote! |
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See Voting Log |
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| Other User Comments |
3/3/2001 4:17:45 PM:Christopher Streva
Love it? Hate it? Have any
suggestions?
Do me a favor and add
in your comments. Please, SPEAK YOUR
MIND! I won't make me mad, it will just
make me want to fix the program. Who
knows, you might be on the special
thanks list for the next version of
Block This.
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3/4/2001 7:12:46 PM:MAGiC MANiAC^mTo
Can you now add in the next version a
demonstration how to use this code in a
application that blocks the unwanted
urls in Internet Explorer?...
Keep
on going...
Code looks great!...
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3/4/2001 10:00:02 PM:ChristopherStreva
That's the best use I could ever make
of this code. Thank you very much
MagicManiac, you'll be on the special
thanks list for that application for
sure!
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3/5/2001 9:15:49 PM:Mike Metral
Wow! this program's bad
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3/5/2001 9:18:20 PM:Mike Metral
J/k about my last message, this
program's great it works very well!!
nice coding too!!!
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3/5/2001 9:19:37 PM:Christopher Streva
Thanks mike!
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3/5/2001 9:23:27 PM:Christopher Streva
why is everyone who voted named mike?
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3/8/2001 1:58:37 PM:Pizzan
Good code! Very useful and easy to use.
Keep on coding!
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3/9/2001 2:04:00 PM:Bubba666
Not that useful, but still cool....
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4/6/2001 1:33:53 PM:Christopher Streva
I'd really like to thank aall the
people who voted for my application and
I'm glad you could make good use of it.
Please leave any comments you may have
to help me out in future versions of
this program.
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4/8/2001 8:14:40 AM:Dave
I love it! I love going on hacking
sites at school.
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4/8/2001 4:18:17 PM:Christopher Streva
That was basicly the entire reason for
building this. Some sites on URL
filtering apps are filtered unjustly
and that's not my idea of protecting a
child from the net.
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4/9/2001 11:35:33 AM:Paul Pickard
Great Application! Now I can show off
at school by opening websites that are
blocked! Just one thing, what use is
the Binary and Decimal conversion?
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4/9/2001 2:00:45 PM:Christopher Streva
That's what allows you to bypass the
filering apps. Most filters can't
detect the URL manipulation.
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4/24/2001 11:39:57 PM:Ted Parker
I think this code converts a url to
digits and that you can then enter the
digits into the url address box of your
browser and it will go to the
address?
I've tried it on a system
with a firewall and one without a
firewall and get the same general error
site not fond message from the
browser.
What am I doing
wrong?
Thanks, Ted
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4/25/2001 1:54:02 PM:Chris Streva
You're probably puting in a full scale
URL instead of just a domain. A domain
would be Yahoo.com, and you're probably
puting in something like
yahoo.com/rm/1.
If this isn't the
case please tell me. In the new block
this i will show you the unlimited
possibilities of block this so that you
can use it to your advantage.
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4/25/2001 10:29:45 PM:Ted Parker
Hello Again,
No, I'm entering like
you say to do. I believe the problem
must be with a browser setting?
Your
program creates http://3631443189 for
yahoo.com. I enter this into the
browser address window and then the
browser comes back with the general
failure to find that address. I am
using IE6 from Microsoft as my
browser.
Thanks for looking into it.
It must be pretty neat to be able to
access pages that are normally not
available!
Ted Parker
ted@aol.com
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4/26/2001 11:47:11 AM:Simon
when i enter yahoo.com, or any other
site, as the url i get the you screwed
up msgbox. But it does work when i
enter the ip address of our proxy as
the url. does any body have any idea
why
that might be?
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4/26/2001 6:15:43 PM:Chris Streva
The problem lies within the fact you're
using IE6. It eliminated the
possibility of accessing converted URLs
so URL filtering apps cannot be
bypassed. Try it with netscape or IE5
or earlier.
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4/27/2001 11:41:52 AM:Sergey
Hey dude, great program. Great example
on how to convert numbers.
I would
think that if there's a proxy that
filters URLs, you won't be able to get
IP address this way, the proxy won't
let you connect to port 80, but you can
probably do nslookup or ping to get an
IP.
If all you want to do is to
convert IPs to decimals you can use the
following code:
Dim strIP As
String
Dim idx As Long
Dim ar
As Variant
Dim cur(3) As
Currency
ar =
Split(txtIP.Text,
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4/27/2001 11:43:56 AM:Sergey
Dim strIP As String
Dim idx As
Long
Dim ar As Variant
Dim cur(3) As
Currency
ar = Split(txtIP.Text,
".")
If IsArray(ar) Then
For idx
= 0 To 3
cur(idx) =
CCur(ar(idx)) * (256 ^ (3 - idx))
Next idx
txtFinalURL.Text =
"http://" & CStr(cur(0) + cur(1) +
cur(2) + cur(3))
End If
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4/27/2001 1:49:39 PM:Chris Streva
Actually, the proxy is only utilized
through browsers such as Netscape and
IE, you cannot place a proxy over every
connection made by a PC, that would be
a firewall.
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10/23/2002 12:34:51 AM:Chad Gutowsky
Slickness.... Good job....
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2/15/2003 4:24:08 PM:Fredrick Turner
Your code worked FLAWLESS...I have a
few ideas for it's use...!
Thanx for
sharing this code with everyone here at
PSC
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2/15/2003 4:26:12 PM:Fredrick Turner
Your code worked FLAWLESS... I'll just
like to thank you for sharing it with
all of us here at PSC...
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