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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By using this code, you agree to the following terms...
You may use
this code in your own programs (and may compile it into a program and distribute it in compiled format for languages that allow it) freely and with no charge.
You MAY NOT redistribute this code (for example to a web site) without written permission from the original author. Failure to do so is a violation of copyright laws.
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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. (If this comment was disrespectful, please report it.)
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! (If this comment was disrespectful, please report it.)
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. (If this comment was disrespectful, please report it.)
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. (If this comment was disrespectful, please report it.)
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? (If this comment was disrespectful, please report it.)
That's what allows you to bypass the filering apps. Most filters can't detect the URL manipulation. (If this comment was disrespectful, please report it.)
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
(If this comment was disrespectful, please report it.)
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. (If this comment was disrespectful, please report it.)
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
(If this comment was disrespectful, please report it.)
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?
(If this comment was disrespectful, please report it.)
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. (If this comment was disrespectful, please report it.)
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, (If this comment was disrespectful, please report it.)
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 (If this comment was disrespectful, please report it.)
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. (If this comment was disrespectful, please report it.)
Your code worked FLAWLESS...I have a few ideas for it's use...! Thanx for sharing this code with everyone here at PSC (If this comment was disrespectful, please report it.)
Your code worked FLAWLESS... I'll just like to thank you for sharing it with all of us here at PSC... (If this comment was disrespectful, please report it.)
Thank you very much :) (If this comment was disrespectful, please report it.)
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3/3/2001 4:17:45 PM: 
