Thread: How to throttle Internet Bandwidth

hi everyone,

i want to make an application that can throttle the internet/network bandwidth of other applications, in c++ preferably. i have the idea pretty much worked out. i could really use one. i know they exist but i would like to learn a little as well.

i know some c . i think i understand c++ well enough (functions, while/for loops, classes, inheritance, pointers, arrays, vectors etc). been studying those things for about a year and a half. i know some basic things of the windows API(windows, child, windows procedure, menu's, semaphores, timers) but nothing big.

i've been reading/searching around about winsock(out of a guess) to find out how bandwidth throttles are made but i havent found anything useful so far. can someone tell me where a good/the best place is to start out?

sym

I would imagine it would be something along the lines of the way firewalls intercept all network connections to provide services like packet filtering.
To which you would record the amount of traffic per unit time, and moderate the onward transmission of packets to achieve the rates you want.

http://clusty.com/search?query=open+...Mozilla-search
Then start digging.

I've written something like this before,

Now what I did:
* Injected a DLL into the process I wanted to control bandwidth over
* Hooked winsock send() and recv()
* Timed how many times send() and recv() were being called with how much data to work out kb/s
* Slowed the rate they could be called (relating approx to kb/s)