BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  How to redirect all HTTP Requests in a client machine to pre          BorlandTalk.com Forum Index -> Delphi Internet Winsock View previous topic :: View next topic   Author Message anil kumar Guest Posted: Mon Nov 24, 2003 6:14 am    Post subject: How to redirect all HTTP Requests in a client machine to pre Hi all, I am working on Filter product. For that I need to have a small proxy component in every client machine which should grab all HTTP Requests (from any browser/Delphi or VB or Java Application ie independent of any browser/Application) and redirect them to a predefined Proxy server. Can anyone suggest me how to go further. Thanks in advance Regards Anil Back to top Remy Lebeau (TeamB) Guest Posted: Mon Nov 24, 2003 7:28 am    Post subject: Re: How to redirect all HTTP Requests in a client machine to "anil kumar" <bkumar1 (AT) vanenburg (DOT) com> wrote Quote: For that I need to have a small proxy component in every client machine which should grab all HTTP Requests (from any browser/Delphi or VB or Java Application ie independent of any browser/Application) and redirect them to a predefined Proxy server. Can anyone suggest me how to go further. What you ask for would require a low-level approach. You would have to hook WinSock directly, or even lower at the NDIS or hardware driver level, and then filter at those levels, just like firewalls do. NDIS would probably be the easiest way to go. But no matter what, you won't be able to use Delphi for it. Maybe for the GUI front-end, at least, but not for the guts of the filtering. Borland tools do not support writing device drivers, so you have to use Microsoft's DDK instead. Gambit Back to top anil kumar Guest Posted: Mon Nov 24, 2003 10:46 am    Post subject: Re: How to redirect all HTTP Requests in a client machine to Hi Gambit, Thank you very much for the prompt reply. My requirement in clent machine is to redirect all HTTP Requests to a proxy server (Another group is working on Apache webserver to make this proxy server). If its only for IE we can do configure IE to connect to the required proxy server using Connection tab in Internet Options dialog. I need to redirect all HTTP requests (no matter from where they are coming from) to that proxy , i mean to say that there will not be any kind of Filtering in client machine, the Filtering takes place at the proxy server only. How you suggest me to go forward ,please respond. Thanks in advance Regards Anil "Remy Lebeau (TeamB)" <gambit47.no.spam (AT) no (DOT) spam.yahoo.com> wrote Quote: "anil kumar" <bkumar1 (AT) vanenburg (DOT) com> wrote in message news:3fc1a19d (AT) newsgroups (DOT) borland.com... For that I need to have a small proxy component in every client machine which should grab all HTTP Requests (from any browser/Delphi or VB or Java Application ie independent of any browser/Application) and redirect them to a predefined Proxy server. Can anyone suggest me how to go further. What you ask for would require a low-level approach. You would have to hook WinSock directly, or even lower at the NDIS or hardware driver level, and then filter at those levels, just like firewalls do. NDIS would probably be the easiest way to go. But no matter what, you won't be able to use Delphi for it. Maybe for the GUI front-end, at least, but not for the guts of the filtering. Borland tools do not support writing device drivers, so you have to use Microsoft's DDK instead. Gambit Back to top Remy Lebeau (TeamB) Guest Posted: Mon Nov 24, 2003 6:54 pm    Post subject: Re: How to redirect all HTTP Requests in a client machine to "anil kumar" <bkumar1 (AT) vanenburg (DOT) com> wrote Quote: I need to redirect all HTTP requests (no matter from where they are coming from) to that proxy Again, what you ask for has to be handled at a lower level, especially since you said earlier that it has to be application-independant. The only way to intercept outgoing connections is as I said earlier - hook WinSock directly, or write an NDIS driver. Quote: i mean to say that there will not be any kind of Filtering in client machine Yes, there will be, because you will have to manually decide which connections are going to be using HTTP or not, based on the addresses they are connecting to, which even that will be tricky to accomplish if they are just connecting to IP addresses. HTTP is just a higher-level protocol that sits on top of TCP, but to intercept and redirect TCP connections, you have to intercept them at a much lower level that has no concept of HTTP at all, which means that you will probably have to actually analyze the requests, and maybe even the actual socket data, buffer it, and redirect it after you know what it really is. TCP is just a byte stream, it has no concept of higher-level protocols or what their content will be. So you will have to handle that manually. I am sorry, but what you are asking for is vastly more complex than what you originally expected. I do not know what else to tell you right now. Gambit Back to top Andy Guest Posted: Tue Nov 25, 2003 6:46 am    Post subject: Re: How to redirect all HTTP Requests in a client machine to HTTP goes through one port, can you not re-direct just that one port to the proxy (Port 8080 is it??) Indy might have something to help you, such as TIdMappedPortTCP . If your Apache web server has a site that you want all to see (Apache is a web server, right?) then re-direct that one url in the hosts file, have a look at hosts.sam, save it as hosts (Windoze). Do all requests the go out on the internet via your proxy or does your 'proxy server' generate the html?. I am reading between the lines a bit in you original message so excuse me if I have it all wrong. From Indy help: Description TIdMappedPortTCP is a TIdTCPServer descendant that implements a proxy for connections to a remote computer system. TIdMappedPortTCP listens for connections on a designated port number and makes a connection to another server using a specified port number. This is useful for certain types of proxy programs. "anil kumar" <bkumar1 (AT) vanenburg (DOT) com> wrote Quote: Hi all, I am working on Filter product. For that I need to have a small proxy component in every client machine which should grab all HTTP Requests (from any browser/Delphi or VB or Java Application ie independent of any browser/Application) and redirect them to a predefined Proxy server. Can anyone suggest me how to go further. Thanks in advance Regards Anil Back to top Remy Lebeau (TeamB) Guest Posted: Tue Nov 25, 2003 8:06 am    Post subject: Re: How to redirect all HTTP Requests in a client machine to "Andy" <net1 (AT) freewire (DOT) co.uk> wrote Quote: HTTP goes through one port Port 80 is the default, but it is not required. HTTP servers are free to listen on just about any port they want. 80 is just the most common. Quote: can you not re-direct just that one port to the proxy (Port 8080 is it??) Whether it is just one port or many, you would still need to hook the system at a lower level to do what anil was originally asking for. Quote: Indy might have something to help you, such as TIdMappedPortTCP . That will not work for what anil was asking for. Quote: If your Apache web server has a site that you want all to see (Apache is a web server, right?) then re-direct that one url in the hosts file, have a look at hosts.sam, save it as hosts (Windoze). That requires altering the host file for every client machine that anil wants to redirect. Besides, that approach won't work anyway. The hosts file is used during resolving hostnames. If you were to alter the file to redirect all hostnames to a local server, that server is still responsible for resolving the original hostname to the true address in order to establish a connection to it. But such resolving would then try to use the hosts file again, which you altered, so they won't resolve correctly. Even if it did work, for what anil was asking, you would have to list every possible hostname imaginable into that file, which wouldn't work either. Gambit Back to top Andy Guest Posted: Tue Nov 25, 2003 5:43 pm    Post subject: Re: How to redirect all HTTP Requests in a client machine to Anil Kumar, is that not Anal Cummer.... or is Anil just unlucky with his name?, Like Mia Butreaks and Annete Kertain. I just thought he was trying to use the Apache server as a web server and had terminology wrong, just covering that angle. What he's trying to do sounds interesting, almost viral. Back to top Andy Guest Posted: Tue Nov 25, 2003 7:14 pm    Post subject: Re: How to redirect all HTTP Requests in a client machine to Sounds Viral, try http://www.astalavista.box.sk you'll find something there I'm sure. "anil kumar" <bkumar1 (AT) vanenburg (DOT) com> wrote Quote: Hi all, I am working on Filter product. For that I need to have a small proxy component in every client machine which should grab all HTTP Requests (from any browser/Delphi or VB or Java Application ie independent of any browser/Application) and redirect them to a predefined Proxy server. Can anyone suggest me how to go further. Thanks in advance Regards Anil Back to top Andy Guest Posted: Tue Nov 25, 2003 11:10 pm    Post subject: Re: How to redirect all HTTP Requests in a client machine to Quote: Port 80 is the default, but it is not required. HTTP servers are free to listen on just about any port they want. 80 is just the most common. Isn't that the whole point of Delphi / Indy.. who cares what port its on, its done for you ? the beauty of the whole thing is these low level things are dealt with without your even knowing it. My UDP 'thingy' sends on port 8093, only its realy sending on 10xx, the first free port, yet I recive on 8093, all dealt with for me. I'll ty it out later... recon I'll make it work. Back to top Remy Lebeau (TeamB) Guest Posted: Tue Nov 25, 2003 11:41 pm    Post subject: Re: How to redirect all HTTP Requests in a client machine to "Andy" <net1 (AT) freewire (DOT) co.uk> wrote Quote: Isn't that the whole point of Delphi / Indy.. who cares what port its on, its done for you ? No, of course not. You still have to specify the ports yourself, they don't magically figure them out for you. You have to tell a server what port to listen for connections on. You have to tell a client what port the server is listening on in order to connect to it. The only difference is that standardized protocols, such as HTTP, may have *default* ports that are used, but they still have to be specified programmably. In the case of an HTTP client, for example, if you make a request for a resource and do not specify an actual port, it *assumes* that port 80 is used, and will try to use that port. That does not mean that port 80 is *actually* used by the server, but it is likely. That still does not negate anything I have said earlier in this disccusion, though. You are thinking too high-level for what Anil was originally asking for. He wants to intercept and reroute all HTTP connections across the machine regardless of which applications are trying to make the connections. Short of reconfiguring each and every single application to connect to his proxy instead, which he specified stated he did *not* want to do, then the *only* other option is hooking at the low-level stack levels. Gambit Back to top xxx Guest Posted: Thu Nov 27, 2003 3:00 pm    Post subject: Re: How to redirect all HTTP Requests in a client machine to hooking winsock api's globally can be done with the madlib, check out http://www.madshi.net (the bcb/delphi section), this lib will lower your high point of view ;) good luck! p.s : be aware of the fact that this lib does its job (perfectly) with 'hacks'. Writing a VXD driver should asure you that it works on EVERY win platform. But at this time of writting, madlib supports all windows versions tho, so you shouldnt worry at this time... Back to top anil kumar Guest Posted: Fri Nov 28, 2003 10:40 am    Post subject: Re: How to redirect all HTTP Requests in a client machine to Hi Gambit, Thats what i want exactly. Is there any way to intercept all the HTTP requests only to reroute them to a predefined server (that also we will develope on Apache where we filter the unwanted or objectionable content). Right now i am working on a POC specific to IE by configuring IE to connect a small proxy written in Delphi which inturn forward the request to Apache server. But this can be changed by the user from Internet options/connections/LAN settings which makes our filtering inactive.This is OK in POC stage. But when going for actual product i need to make that small proxy in the client machine a browser independent one and secured means not breakable(Like in IE options in the above POC case). How can i do that? please suggest me.. Note : There is a client level filter product called Pure Sight , he is handling at WinSock level so tehir filter is browser independent. How did they do? Please tell me suggestions. Thanks in advance Regards Anil "Remy Lebeau (TeamB)" <gambit47.no.spam (AT) no (DOT) spam.yahoo.com> wrote Quote: "Andy" <net1 (AT) freewire (DOT) co.uk> wrote in message news:3fc3e0e5 (AT) newsgroups (DOT) borland.com... Isn't that the whole point of Delphi / Indy.. who cares what port its on, its done for you ? No, of course not. You still have to specify the ports yourself, they don't magically figure them out for you. You have to tell a server what port to listen for connections on. You have to tell a client what port the server is listening on in order to connect to it. The only difference is that standardized protocols, such as HTTP, may have *default* ports that are used, but they still have to be specified programmably. In the case of an HTTP client, for example, if you make a request for a resource and do not specify an actual port, it *assumes* that port 80 is used, and will try to use that port. That does not mean that port 80 is *actually* used by the server, but it is likely. That still does not negate anything I have said earlier in this disccusion, though. You are thinking too high-level for what Anil was originally asking for. He wants to intercept and reroute all HTTP connections across the machine regardless of which applications are trying to make the connections. Short of reconfiguring each and every single application to connect to his proxy instead, which he specified stated he did *not* want to do, then the *only* other option is hooking at the low-level stack levels. Gambit Back to top Remy Lebeau (TeamB) Guest Posted: Sat Nov 29, 2003 1:01 am    Post subject: Re: How to redirect all HTTP Requests in a client machine to "anil kumar" <bkumar1 (AT) vanenburg (DOT) com> wrote Quote: Is there any way to intercept all the HTTP requests only to reroute them to a predefined server I already addressed that earlier. 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