Software Defined Routing with data transfers

Implements Distance Vector routing over a network of simulated routers with link costs with file data routing.

Spec

• Periodic routing updates are sent over UDP to maintain routing tables.
• Files are packetized and routed via TCP after consulting routing tables to find mincost routes.
• Supports multiple file transfer flows.
• Remove timed-out routers from network.
• Packets are dropped on TTL expiry.
• Implements controller to send control commands to routers.
• Use select syscall to accept input commands and monitor sockets at the same time(single-threaded).