pygdb is a simple wrapper around gdb that enriches the gdb console by a number of features that are useful for reversing.

You write a runfile (JSON file) that describes how you want to run your target and what breakpoints to auto-set on, what to auto-execute on those breakpoints and so on. The example given in example_bc.json shows how the syntax looks like:

{
	"inferior":		"/usr/bin/bc",
	"args":			[ ],
	"env": {
		"foo":	"bar"
	},
	"run": true,
	"break": [
		{
			"on":	"__pselect",
			"execute": [
				"hexdump readfds 0x10"
			]
		}
	]
}

This example auto-runs bc, sets an additional environment variable, runs it without arguments, breaks on __pselect and, when it does break, performs a hex dump of the readfds array. Then, just run it like this:

$ ./rungdb example_bc.json

GNU GPL-3.