/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 *
 * Tests for VbTryLoadKernel()
 */

#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>

#include "gbb_header.h"
#include "load_kernel_fw.h"
#include "rollback_index.h"
#include "test_common.h"
#include "utility.h"
#include "vboot_api.h"
#include "vboot_kernel.h"

#define MAX_TEST_DISKS 10
#define DEFAULT_COUNT -1

typedef struct {
	uint64_t bytes_per_lba;
	uint64_t lba_count;
	uint32_t flags;
	const char *diskname;
} disk_desc_t;

typedef struct {
	char *name;

	/* inputs for test case */
	uint32_t want_flags;
	VbError_t diskgetinfo_return_val;
	disk_desc_t disks_to_provide[MAX_TEST_DISKS];
	int disk_count_to_return;
	VbError_t loadkernel_return_val[MAX_TEST_DISKS];

	/* outputs from test */
	uint32_t expected_recovery_request_val;
	const char *expected_to_find_disk;
	const char *expected_to_load_disk;
	uint32_t expected_return_val;

} test_case_t;

/****************************************************************************/
/* Test cases */

static const char pickme[] = "correct choice";
#define DONT_CARE ((const char *)42)

test_case_t test[] = {
	{
		.name = "first removable drive",
		.want_flags = VB_DISK_FLAG_REMOVABLE,
		.disks_to_provide = {
			/* too small */
			{512,   10,  VB_DISK_FLAG_REMOVABLE, 0},
			/* wrong LBA */
			{2048, 100,  VB_DISK_FLAG_REMOVABLE, 0},
			/* wrong type */
			{512,  100,  VB_DISK_FLAG_FIXED, 0},
			/* wrong flags */
			{512,  100,  0, 0},
			/* still wrong flags */
			{512,  100,  -1, 0},
			{512,  100,  VB_DISK_FLAG_REMOVABLE, pickme},
			/* already got one */
			{512,  100,  VB_DISK_FLAG_REMOVABLE, "holygrail"},
		},
		.disk_count_to_return = DEFAULT_COUNT,
		.diskgetinfo_return_val = VBERROR_SUCCESS,
		.loadkernel_return_val = {0, 1, 1, 1, 1, 1, 1, 1, 1, 1,},

		.expected_recovery_request_val = VBNV_RECOVERY_NOT_REQUESTED,
		.expected_to_find_disk = pickme,
		.expected_to_load_disk = pickme,
		.expected_return_val = VBERROR_SUCCESS
	},
	{
		.name = "second removable drive",
		.want_flags = VB_DISK_FLAG_REMOVABLE,
		.disks_to_provide = {
			/* wrong flags */
			{512,  100,  0, 0},
			{512,  100,  VB_DISK_FLAG_REMOVABLE, "not yet"},
			{512,  100,  VB_DISK_FLAG_REMOVABLE, pickme},
		},
		.disk_count_to_return = DEFAULT_COUNT,
		.diskgetinfo_return_val = VBERROR_SUCCESS,
		.loadkernel_return_val = {1, 0, 1, 1, 1, 1, 1, 1, 1, 1,},

		.expected_recovery_request_val = VBNV_RECOVERY_NOT_REQUESTED,
		.expected_to_find_disk = pickme,
		.expected_to_load_disk = pickme,
		.expected_return_val = VBERROR_SUCCESS
	},
	{
		.name = "first fixed drive",
		.want_flags = VB_DISK_FLAG_FIXED,
		.disks_to_provide = {
			/* too small */
			{512,   10,  VB_DISK_FLAG_FIXED, 0},
			/* wrong LBA */
			{2048, 100,  VB_DISK_FLAG_FIXED, 0},
			/* wrong type */
			{512,  100,  VB_DISK_FLAG_REMOVABLE, 0},
			/* wrong flags */
			{512,  100,  0, 0},
			/* still wrong flags */
			{512,  100,  -1, 0},
			/* flags */
			{512,  100,  VB_DISK_FLAG_REMOVABLE|VB_DISK_FLAG_FIXED,
			 0},
			{512,  100,  VB_DISK_FLAG_FIXED, pickme},
			/* already got one */
			{512,  100,  VB_DISK_FLAG_FIXED, "holygrail"},
		},
		.disk_count_to_return = DEFAULT_COUNT,
		.diskgetinfo_return_val = VBERROR_SUCCESS,
		.loadkernel_return_val = {0, 1, 1, 1, 1, 1, 1, 1, 1, 1,},

		.expected_recovery_request_val = VBNV_RECOVERY_NOT_REQUESTED,
		.expected_to_find_disk = pickme,
		.expected_to_load_disk = pickme,
		.expected_return_val = VBERROR_SUCCESS
	},
	{
		.name = "no drives at all",
		.want_flags = VB_DISK_FLAG_FIXED,
		.disks_to_provide = {},
		.disk_count_to_return = DEFAULT_COUNT,
		.diskgetinfo_return_val = VBERROR_SUCCESS,
		.loadkernel_return_val = {1, 1, 1, 1, 1, 1, 1, 1, 1, 1,},

		.expected_recovery_request_val = VBNV_RECOVERY_RW_NO_DISK,
		.expected_to_find_disk = 0,
		.expected_to_load_disk = 0,
		.expected_return_val = VBERROR_NO_DISK_FOUND
	},
	{
		.name = "no valid drives",
		.want_flags = VB_DISK_FLAG_FIXED,
		.disks_to_provide = {
			/* too small */
			{512,   10,  VB_DISK_FLAG_FIXED, 0},
			/* wrong LBA */
			{2048, 100,  VB_DISK_FLAG_FIXED, 0},
			/* wrong type */
			{512,  100,  VB_DISK_FLAG_REMOVABLE, 0},
			/* wrong flags */
			{512,  100,  0, 0},
			/* still wrong flags */
			{512,  100,  -1, 0},
			/* doesn't load */
			{512,  100,  VB_DISK_FLAG_FIXED, "bad1"},
			/* doesn't load */
			{512,  100,  VB_DISK_FLAG_FIXED, "bad2"},
		},
		.disk_count_to_return = DEFAULT_COUNT,
		.diskgetinfo_return_val = VBERROR_SUCCESS,
		.loadkernel_return_val = {1, 1, 1, 1, 1, 1, 1, 1, 1, 1,},

		.expected_recovery_request_val = VBNV_RECOVERY_RW_NO_KERNEL,
		.expected_to_find_disk = DONT_CARE,
		.expected_to_load_disk = 0,
		.expected_return_val = 1
	},
};

/****************************************************************************/

/* Mock data */
static LoadKernelParams lkparams;
static VbDiskInfo mock_disks[MAX_TEST_DISKS];
static test_case_t *t;
static int load_kernel_calls;
static uint32_t got_recovery_request_val;
static const char *got_find_disk;
static const char *got_load_disk;
static uint32_t got_return_val;

/**
 * Reset mock data (for use before each test)
 */
static void ResetMocks(int i)
{
	Memset(&lkparams, 0, sizeof(lkparams));
	Memset(&mock_disks, 0, sizeof(mock_disks));
	load_kernel_calls = 0;

	got_recovery_request_val = VBNV_RECOVERY_NOT_REQUESTED;
	got_find_disk = 0;
	got_load_disk = 0;
	got_return_val = 0xdeadbeef;

	t = test + i;
}

int is_nonzero(const void *vptr, size_t count)
{
	const char *p = (const char *)vptr;
	while (count--)
		if (*p++)
			return 1;

	return 0;
}

/****************************************************************************/
/* Mocked verification functions */

VbError_t VbExDiskGetInfo(VbDiskInfo **infos_ptr, uint32_t *count,
                          uint32_t disk_flags)
{
	int i;
	int num_disks = 0;

	VBDEBUG(("My %s\n", __FUNCTION__));

	*infos_ptr = mock_disks;

	for(i = 0; i < MAX_TEST_DISKS; i++) {
		if (is_nonzero(&t->disks_to_provide[i],
			       sizeof(t->disks_to_provide[i]))) {
			mock_disks[num_disks].bytes_per_lba =
				t->disks_to_provide[i].bytes_per_lba;
			mock_disks[num_disks].lba_count =
				t->disks_to_provide[i].lba_count;
			mock_disks[num_disks].flags =
				t->disks_to_provide[i].flags;
			mock_disks[num_disks].handle = (VbExDiskHandle_t)
				t->disks_to_provide[i].diskname;
			VBDEBUG(("  mock_disk[%d] %lld %lld 0x%x %s\n", i,
				 mock_disks[num_disks].bytes_per_lba,
				 mock_disks[num_disks].lba_count,
				 mock_disks[num_disks].flags,
				 (mock_disks[num_disks].handle
				  ? (char *)mock_disks[num_disks].handle
				  : "0")));
			num_disks++;
		} else {
			mock_disks[num_disks].handle =
				(VbExDiskHandle_t)"INVALID";
		}
	}

	if (t->disk_count_to_return >= 0)
		*count = t->disk_count_to_return;
	else
		*count = num_disks;

	VBDEBUG(("  *count=%lld\n", *count));
	VBDEBUG(("  return 0x%x\n", t->diskgetinfo_return_val));

	return t->diskgetinfo_return_val;
}

VbError_t VbExDiskFreeInfo(VbDiskInfo *infos,
                           VbExDiskHandle_t preserve_handle)
{
	got_load_disk = (const char *)preserve_handle;
	VBDEBUG(("%s(): got_load_disk = %s\n", __FUNCTION__,
		 got_load_disk ? got_load_disk : "0"));
	return VBERROR_SUCCESS;
}

VbError_t LoadKernel(LoadKernelParams *params)
{
	got_find_disk = (const char *)params->disk_handle;
	VBDEBUG(("%s(%d): got_find_disk = %s\n", __FUNCTION__,
		 load_kernel_calls,
		 got_find_disk ? got_find_disk : "0"));
	return t->loadkernel_return_val[load_kernel_calls++];
}

int VbNvSet(VbNvContext *context, VbNvParam param, uint32_t value)
{
	VBDEBUG(("%s(): got_recovery_request_val = %d (0x%x)\n", __FUNCTION__,
		 value, value));
	got_recovery_request_val = value;
	return 0;
}

/****************************************************************************/

static void VbTryLoadKernelTest(void)
{
	int i;
	int num_tests =  sizeof(test) / sizeof(test[0]);

	for (i = 0; i < num_tests; i++) {
		printf("Test case: %s ...\n", test[i].name);
		ResetMocks(i);
		TEST_EQ(VbTryLoadKernel(0, &lkparams, test[i].want_flags),
			t->expected_return_val, "  return value");
		TEST_EQ(got_recovery_request_val,
			t->expected_recovery_request_val, "  recovery_request");
		if (t->expected_to_find_disk != DONT_CARE) {
			TEST_PTR_EQ(got_find_disk, t->expected_to_find_disk,
				    "  find disk");
			TEST_PTR_EQ(got_load_disk, t->expected_to_load_disk,
				    "  load disk");
		}
	}
}

int main(void)
{
	VbTryLoadKernelTest();

	return gTestSuccess ? 0 : 255;
}