Need to check Port 80 using C

Hiya there

I need to write a command line app that checks if Port 80 is ope for http requests or blocked. IF its blocked it would be good to be able to output what is blocking it (NOrton or another firewall for example) but this is not totally needed.

If anyone has any ideas, snippets, that would be great!

Thanks

Dunno if this helps? I haven't read it through....

http://tangentsoft.net/wskfaq/articles/lame-list.html

Does nmap not suffice for this need?

Hi

Thanks for the posts above. The winsocks stuff isn't really what I was after.

The NMAP tool does exactly what I need to be honest, except for two issue (there are always issues!)

1) it requires a user to install Winpcap (this has got to be more straightforward than that) and
2) The output is deemed to confusting for the client!

Any other ideas??

Andy

Quote:

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Originally Posted by PaperDoylie

Any other ideas??

Andy

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cURL?

Yeah I download cURL, spent a while looking at it and got a bit lost to be honest.

I have also found

http://www.nirsoft.net/utils/cports.html

Which is good and the Microsoft tool

http://www.petri.co.il/quickly_find_...open_ports.htm

does something similar.

WOuld have liked to write it myself but time is off the essense!

-Create a socket
-Set the socket to non-blocking
-Call the connect function (it should return immediately)
-Use select with a timeout of 5 seconds. If there is a connection on port 80, select should return 1 WITHIN 5 seconds. If there is no connection, than select should return 0 AFTER 5 seconds.
-Close socket.

In the end I did it in VS2005 using C++ not C.

IF anyone wants to see the project the please ask