I started hacking my camera VStarcam H6837WI after I discovered it is running Linux:
http://hardenedgentoo.blogspot.com.br/2012/07/fun-with-vstarcam-ip-camera.html
Unfortunately my camera came without telnet support on it, but fortunately this camera let you to do firmware’s downgrade, then I did it and got telnet working! \o/
After connecting using telnet I did a dump of flash content (/dev/mtd) to SD Card using “dd” command existent on it.
So I started to search for other people hacking IP Cameras and found this nice post:
https://irishjesus.wordpress.com/2010/03/30/hacking-the-foscam-fi8908w/
All these cameras clones are using Linux but nobody released its source code, exception to few companies:
http://www.openipcam.com/files/ARM9/