Skip to content

README.md

Latest commit

 

History

History
51 lines (44 loc) · 2.74 KB

README.md

File metadata and controls

51 lines (44 loc) · 2.74 KB

🌐 UDP Sockets

A connectionless transmission model with a minimum protocol mechanism. Unlike TCP, UDP (Use Datagram Protocol) have no handshaking/acknowledgements of data (No ACKs). Because of this, it's not guaranteed that any data is received by the end host. The up side, this avoids some delays due to it's simplicity.

Program

A C Language based executable program that sends UDP commands/packets to a specified server host from a local client host.

⚙️ SETUP

Makefile

  • To create executable objects of client and server, run make within the udp directory.
    • Note: Compiler warning messages are disabled.
  • To remove/clean objects created, run make clean.

CLI Commands

The client executable file takes two command line arguments. The first is the IP address, and the second is the port number the server application is using. To find the IP address of the current server, try hostname -i (Linux). The server will use it's current IP, and only needs the port number to open.

  • Complile the C-program
    gcc udp_client.c -o udp_client
    gcc udp_server.c -o udp_server
    OR
    run makefile commands (details in section above)

Connect to one of CUB's educational labs remote access servers:

SSH into Linux VM: ssh <IDENTIKEY>@elra-##.cs.colorado.edu, ## can be 01, 02, 03, or 04

  • Password is same as IDENTIKEYs
  • Find IP of server: ip addr
Sent files from local to elra server
  1. From client:
scp -r <local_folder_location> <IDENTIKEY>@elra-##.cs.colorado.edu:<folder location>
# Example:
scp -r ./UDP_Sockets/udp name@elra-02.cs.colorado.edu:./udp_sockets

Sending requests to server

  1. Create object executable files, listed under CLI Commands above.
  2. Open port on server to connect incoming traffic to ./udp_server <port>.
  3. Connect to the server with ./udp_client <server ip> <port>.
  4. Enter command when prompted on the client.
  5. Note: this can be run locally, using different ports for the server and client.
    server connection client connection

📟 USE

UDP User (client) Commands

  1. get <file_name> - copies specified file_name from the server
  2. put <file_name> - copies specified file_name to the server
  3. delete <file_name> - delete specified file_name from the server
  4. ls - lists out all files in the current directory
  5. exit - exits out of client console
  6. Any command not listed above will loop back to available commands.