TCP Echo Client + Servers in C

This project was designed to support multi-threading of clients to gain extra credit as an undergrad.

Assumptions:

Agreed upon method of storing keys between all machines : int value = n*1000+e. This will be used to save/retrieve both n and e from the public key.
Clients and Brokers choose unique Principal IDs
Prime numbers should be chosen for
and - these will be used to generate a small e and corresponding d for message encryption and decryption using public/private key schema (RSA)
Instructions never declared there should be a loop in client. It quits automatically after recieving done message from broker. Exit can be accomplished from broker using Ctrl+C.
Assumes .csv is already created with headers for Key Manager use

Notes:

This is not the most efficient or robust code. Much error handling and optimizations can be implemented. That said, I believe it suits the project requirements.
These were created and compiled on the emunix.emich.edu server.

Programs can be compiled using the provided bash script (build.sh) by running: bash build.sh

$(gcc TCPEchoClient.c DieWithError.c -o client -std=c99 -lm) $(gcc TCPEchoServer.c HandleTCPClient.c DieWithError.c -o server -std=gnu99 -lm -lpthread) $(gcc KeyManager.c DieWithError.c -o keymanager)

Details

Key Manager:

parameters: ./keymanager run example : ./keymanager 1500

Broker:

parameters ./server <THIS BROKER's UDP PORT> <THIS BROKER's TCP PORT>

run example: ./server 1501 1501 5 59 107 127.0.0.1 1500

Client:

parameters: ./client <Server/Broker IP>