custom PKT&TCP RESET,Block page for Winpkfilter wwwcenso

[pratap]

I am trying winpkfilter WWWcensor sample… to Block that Web Page as soon keyword encountered.

I am able to modify the content of keyword in the page i.e S*X —-> some XXX
It is reflecting in the page, all the blocked words are replaced with given keywords.

What I wanted to try now is give Blocked message Page to the Browser .

To do this..,

I need to construct a custom packet with source and destination from original packet and send that packet to upper stack i.e MSTCP

and send a TCP RESET to the site ( get the ip from original packet)
— OR —- Block subsequent packets from same site.

Please Help…..[/b]

[Vadim Smirnov]

You can modify the packet directly without making a copy. However, don’t forget to recalculate checksums before reinjecting the modified packet. Also, if you change TCP data length you have to change TCP header SEQ value.

[pratap]

What I wanted to try now is give Blocked message Page to the Browser .

To do this..,

I need to construct a custom packet with source and destination from original packet and send that packet to upper stack i.e MSTCP

and send a TCP RESET to the site ( get the ip from original packet)
— OR —- Block subsequent packets from same site.

Please Help…..

[Vadim Smirnov]

It looks you know what you need to do. What help are you asking for?

[pratap]

I know what to do , But not how to do

Especially, I can’t able to construct the packets with block message .

[Author]

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