CODEWITHSUNDEEP
delphiurlbrowser
Shane
Shane

Reputation: 59

URL Stop using Delphi service

I want to have background service written in Delphi 7, that stops a specific URL from being loaded by any browser. Is this possible?

Can anyone point me in a direction?

Thanks in advance.

Shane

Upvotes: 1

Views: 472

Answers (3)

Remy Lebeau
Remy Lebeau

Reputation: 598194

For Internet Explorer, you can write a Browser Helper Object that IE itself loads and passes browser events to. The BHO can then accept/reject URLS on a per-request basis as needed.

Upvotes: 0

Jan Doggen
Jan Doggen

Reputation: 9106

There are two approaches of which the second one is technically the best:

  • Write a DLL that you inject into all processes and if these processes are for a browser you have to intercept and filter all traffic, e.g. using Windows sockets

  • Write a Layered service provider that works a bit like a firewall (at a lower level in the OS)

I've worked in internet filtering software and I can tell you both are big undertakings. We initially took the first approach, then switched to the other because it's technically better. [And we never finished that transition because the company folded ;-(]

We did not write our own LSP (it's a big job in itself) but used the products from Komodia. Although they write for C, the people were very helpful answering our questions about porting to Delphi.

But as I said earlier, this is BIG: you have to deal with 32 and 64 bit code, http versus https, protecting services from being stopped, etc. Any non-programming solution that you can find is better (although easy to circumvent).

If you still want to program: prepare for 1 man-year of coding using LSP.

Upvotes: 3

GolezTrol
GolezTrol

Reputation: 116180

A service, no, I don't think so. But you can edit the 'hosts' file so that the domain of the url points to 127.0.0.1. You can make a service that 'guards' this file, although the service itself must have elevated rights to be able to edit it, and of course, the service itself can be killed as well, if the user has the rights to do so.

Anyway, if you manage to edit the file, the browser will not be able to find the server by domain name. Of course, urls with an IP address cannot be blocked this way and neither can you block specific urls, only the entire domain.

But in general, this is not something to solve using a custom service, but in the firewall on either the PC or the router.

Upvotes: 1

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