Sending Binary Data over Multi-Threaded Servers in C

Pubblicato il: 27 febbraio 2025
sul canale di: Tralie Thinks Through

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We discuss how to create a thread-safe multi-threaded server in C, and I show how to send and receive binary data. I finish by looking at this traffic in wireshark.

Code can be found here:
https://github.com/ursinusnetworks/Mo...

Related assignment at this link:
https://ursinusnetworks.github.io/S20...

Also note that Beej's guide explains an alternative way to handle multiple clients by forking processes in C:
https://beej.us/guide/bgnet/html/spli...

Table of contents:
00:40 Modifications to getaddrinfo() for server

04:30 bind() and listen()

08:06 accept() incoming connections and create new full duplex sockets

13:00 Printing IP address of newly connected clients

16:00 recv() on new socket

18:36 Setting up pthreads for multithreaded socket connections

22:36 Passing along multiple parameters to thread servicing methods

26:15 Receiving data in threads

29:30 Sending binary headers from client to server

35:20 Being careful about endianness before sending binary data

38:47 Receiving binary header and body on the server

44:10 Locking shared variables between threads with mutexes

49:53 Be very careful to unlock the locks when you're finished!

51:30 Examining 3 way handshake and traffic in wireshark

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