This is intended to be a quick guide / reference on how you can write your own i/o drivers for dnscat2! To give you an idea of what they can do, here are some examples of i/o drivers:

• Console (turned on with --console, lets users type messages to the server)
• Exec (turned on with --exec, tunnels i/o to/from a process)
• Command (default; an interactive session that can spawn other sessions)

This guide is about how to add others!

Here are the steps: - Update drivers/driver.(c|h) to add simple wrappers to handle the driver type (discount polymorphism) - Create a .c and .h file that implement the following methods: - driver_XXX_t *driver_XXX_create(select_group_t *group); - void driver_XXX_destroy(driver_XXX_t *driver); - void driver_XXX_data_received(driver_XXX_t *driver, uint8_t *data, size_t length); - uint8_t *driver_XXX_get_outgoing(driver_XXX_t *driver, size_t *length, size_t max_length); - void driver_XXX_close(driver_XXX_t *driver); - Add the .o for the driver to the Makefile under OBJS - Add the following function to controller/session.(c|h): - session_t *session_create_XXX(select_group_t *group, char *name) - If it's a sub-protocol - that is, anything that the server needs to handle in a special way - be sure to set some SYN options that the server will see - Make it possible to create the driver - Update main() in dnscat.c with commandline options to create the driver (don't forget to update 'usage'!) - Update driver_command.c with the ability to create instances of it