/*
 * OLD OBSOLETE libcryptsetup API example
 * DO NOT USE FOR NEW PROJECTS.
 */

#include <stdio.h>
#include <stdlib.h>
#include "libcryptsetup.h"

/* definition was introduced together with log */
#ifdef CRYPT_LOG_NORMAL
#define HAVE_ICB
#endif

#ifdef HAVE_ICB
static int yesDialog(char *msg)
{
	printf("You are sure, I know.\n");
	return 1;
}

static void cmdLineLog(int class, char *msg)
{
	fputs(msg, stdout);
}

static struct interface_callbacks cmd_icb = {
	.yesDialog = yesDialog,
	.log = cmdLineLog,
};
#endif

int LuksOpen(const char *device, const char *name)
{
	struct crypt_options co = {
		.device = device,
		.name = name,
		// .key_file = "-", // standard input, you can echo -n"xxx"|prg
		// or use key file. API cannot give password directly
		.tries = 1,
#ifdef HAVE_ICB
		.icb = &cmd_icb,
#endif
	};

	return crypt_luksOpen(&co);
}

// r == 0 inactive, r > 0 active (r== opencount), othewise error (-EINVAL, -ENODEV, -EBUSY)
int LuksClose(const char *name)
{
	struct crypt_options co = {
		.name = name,
#ifdef HAVE_ICB
		.icb = &cmd_icb,
#endif
	};

	return crypt_remove_device(&co);
}

void print_error()
{
	char buf[256];

	crypt_get_error(buf, sizeof(buf));
	printf("%s\n", buf);
}

int main (int argc, char *argv[])
{
	const char *device = "/dev/loop0";
	const char *name = "xxx"; // let's call me /dev/mapper/xxx
	int r;

	r = LuksOpen(device, name);
	if (r)
		print_error();

        r = LuksClose(name);
	if (r)
		print_error();

	return r ? 0 : 1;
}