/* 
   Copyright (C) 2012 by Ronnie Sahlberg <ronniesahlberg@gmail.com>
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, see <http://www.gnu.org/licenses/>.
*/

#include <stdio.h>
#include <arpa/inet.h>
#include "iscsi.h"
#include "iscsi-private.h"
#include "scsi-lowlevel.h"
#include "iscsi-test.h"

static int change_bufferoffset;

uint32_t block_size;

static int my_iscsi_queue_pdu(struct iscsi_context *iscsi _U_, struct iscsi_pdu *pdu)
{
	if (pdu->outdata.data[0] != ISCSI_PDU_DATA_OUT) {
		return 0;
	}
	switch (change_bufferoffset) {
	case 1:
		/* Add 1M to the buffer offset */
		*(uint32_t *)&pdu->outdata.data[40] = htonl(ntohl(*(uint32_t *)&pdu->outdata.data[40]) + 1024*1024);
		break;
	case 2:
		/* Add -'block_size' to the buffer offset */
		*(uint32_t *)&pdu->outdata.data[40] = htonl(ntohl(*(uint32_t *)&pdu->outdata.data[40]) - block_size);
		break;
	}
	return 0;
}

static void test_cb(struct iscsi_context *iscsi _U_, int status,
			void *command_data _U_, void *private_data)
{
	struct scsi_task *task = command_data;
	struct iscsi_async_state *state = private_data;

	state->finished = 1;
	state->status = status;

	if (status) {
		task->status = status;
	}
}


int T1020_bufferoffset_invalid(const char *initiator, const char *url, int data_loss, int show_info)
{ 
	struct iscsi_context *iscsi;
	struct scsi_task *task;
	struct scsi_readcapacity16 *rc16;
	int ret, lun;
	unsigned char data[4096 * 256];
	struct iscsi_async_state test_state;

	printf("1020_bufferoffset_invalid:\n");
	printf("==========================\n");
	if (show_info) {
		printf("Test sending commands with invalid bufferoffset values.\n");
		printf("We negotiate both DataPDUInOrder and DataSequenceInOrder so BufferOffset must be in sequence both within and across multiple sequences\n");
		printf("1, Test that BufferOffset==1M too high is an error\n");
		printf("2, Test that BufferOffset==-'block_size' is an error\n");
		printf("\n");
		return 0;
	}

	iscsi = iscsi_context_login(initiator, url, &lun);
	if (iscsi == NULL) {
		printf("Failed to login to target\n");
		return -1;
	}

	/* find the size of the LUN */
	task = iscsi_readcapacity16_sync(iscsi, lun);
	if (task == NULL) {
		printf("Failed to send READCAPACITY16 command: %s\n", iscsi_get_error(iscsi));
		ret = -1;
		goto finished;
	}
	if (task->status != SCSI_STATUS_GOOD) {
		printf("READCAPACITY16 command: failed with sense. %s\n", iscsi_get_error(iscsi));
		ret = -1;
		scsi_free_scsi_task(task);
		goto finished;
	}
	rc16 = scsi_datain_unmarshall(task);
	if (rc16 == NULL) {
		printf("failed to unmarshall READCAPACITY16 data. %s\n", iscsi_get_error(iscsi));
		ret = -1;
		scsi_free_scsi_task(task);
		goto finished;
	}
	block_size = rc16->block_length;
	scsi_free_scsi_task(task);


	if (!data_loss) {
		printf("--dataloss flag is not set. Skipping test\n");
		ret = -2;
		goto finished;
	}


	ret = 0;

	iscsi->use_immediate_data = ISCSI_IMMEDIATE_DATA_NO;
	iscsi->target_max_recv_data_segment_length = block_size;
	local_iscsi_queue_pdu = my_iscsi_queue_pdu;

	printf("Write 2 DATA-IN with BUFFEROFFSET 1M too high ... ");
	/* we dont want autoreconnect since some targets will drop the
	 * on this condition.
	 */
	iscsi_set_noautoreconnect(iscsi, 1);

	task = iscsi_write10_task(iscsi, lun, 0, data, 2 * block_size, block_size,
				0, 0, 0, 0, 0,
				test_cb, &test_state);
	if (task == NULL) {
	        printf("[FAILED]\n");
		printf("Failed to send WRITE10 command: %s\n", iscsi_get_error(iscsi));
		ret++;
		goto test2;
	}
	change_bufferoffset = 1;
	test_state.task     = task;
	test_state.finished = 0;
	test_state.status   = 0;
	wait_until_test_finished(iscsi, &test_state);
	change_bufferoffset = 0;
	if (task->status == SCSI_STATUS_GOOD) {
	        printf("[FAILED]\n");
		printf("WRITE10 command successful. Should have failed with error\n");
		ret++;
		scsi_free_scsi_task(task);
		goto test2;
	}
	scsi_free_scsi_task(task);
	printf("[OK]\n");

test2:
	/* in case the previous test failed the session */
	iscsi_set_noautoreconnect(iscsi, 0);
	iscsi->use_immediate_data = ISCSI_IMMEDIATE_DATA_NO;
	iscsi->target_max_recv_data_segment_length = block_size;

	printf("Write 2 DATA-IN with BUFFEROFFSET==-%d ... ", block_size);
	/* we dont want autoreconnect since some targets will drop the
	 * on this condition.
	 */
	iscsi_set_noautoreconnect(iscsi, 1);

	task = iscsi_write10_task(iscsi, lun, 0, data, 2 * block_size, block_size,
				0, 0, 0, 0, 0,
				test_cb, &test_state);
	if (task == NULL) {
	        printf("[FAILED]\n");
		printf("Failed to send WRITE10 command: %s\n", iscsi_get_error(iscsi));
		ret++;
		goto test3;
	}
	change_bufferoffset = 2;
	test_state.task     = task;
	test_state.finished = 0;
	test_state.status   = 0;
	wait_until_test_finished(iscsi, &test_state);
	change_bufferoffset = 0;
	if (task->status == SCSI_STATUS_GOOD) {
	        printf("[FAILED]\n");
		printf("WRITE10 command successful. Should have failed with error\n");
		ret++;
		scsi_free_scsi_task(task);
		goto test3;
	}
	scsi_free_scsi_task(task);
	printf("[OK]\n");


test3:
	/* in case the previous test failed the session */
	iscsi_set_noautoreconnect(iscsi, 0);
	iscsi->use_immediate_data = ISCSI_IMMEDIATE_DATA_NO;
	iscsi->target_max_recv_data_segment_length = block_size;

finished:
	local_iscsi_queue_pdu = NULL;
	iscsi_destroy_context(iscsi);
	return ret;
}