Server daemon to remotely modify text files

I need a program writing in c/c++ to run on Linux. On execution it will run as a daemon in the background and listen on a configurable IP and port. It will only accept connections from configurable remote IP addresses. On accepting a connection it will accept a command, with parameters, then depending on which command it is, it will do one of the following: 1) search a specified text file for the string provided 2) remove a block of text from the text file 3) add a block of text to the text file The text file is the username/password file for a RADIUS server that runs on the same system, the blocks of text to add/remove are the RADIUS attributes for a particular dialup user. All the configurable variables should be contained within one config text file. Source code should be well documented and written to allow easy modification/expansion at a later stage. In short, we need to add/delete and search for users on the RADIUS system, from a seperate server. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform RHE Linux