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Custom IO Callback Example

This is an example to demonstrate how the custom IO callbacks can be used to facilitate a TLS connection using any medium. Here we chose the medium: "File System".

Other transports might be:

  • USB Serial connection
  • Bluetooth
  • RFID
  • Wifi
  • Ethernet

These examples use the wolfSSL Custom IO Callbacks to read and write to the file system and perform a successful handshake.

Building the examples:

From the wolfssl directory:

./configure --enable-debug
sudo make install

NOTE: Debug was enabled in case a user wishes to use the verbose flag to see what is happening in real time:

From the file-server directory:

make

From the file-client directory:

make

Usage examples:

From the file-server directory: ./start-server ./start-server -v ./start-server -verbose

From the file-client directory: ./start-client ./start-client -v ./start-client -verbose

(-v and -verbose accomplish the same thing)

SCRIPTS

The scripts provided attempt to make testing easier.

  • file-server/check.sh
    • starts the server in a background shell and runs the client

USAGE: ./check.sh ./check.sh -v ./check.sh -verbose

  • file-client/clean-io-files.sh
    • If something happens and there is leftover junk in the io files run this script to quickly cleanup before next round of testing.

USAGE: ./clean-io-files.sh