/* 
   Copyright (C) 2014 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 <CUnit/CUnit.h>

#include "iscsi.h"
#include "iscsi-private.h"
#include "scsi-lowlevel.h"
#include "iscsi-test-cu.h"

static int change_datasn;

static int my_iscsi_queue_pdu(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
        uint32_t datasn;

        /* avoid changing DataSN during reconnect */
	if (!iscsi->no_auto_reconnect)
	        goto out;
        
        if (pdu->outdata.data[0] != ISCSI_PDU_DATA_OUT) {
                goto out;
        }
        switch (change_datasn) {
        case 1:
                /* change DataSN to 0 */
                iscsi_pdu_set_datasn(pdu, 0);
                break;
        case 2:
                /* change DataSN to 27 */
                iscsi_pdu_set_datasn(pdu, 27);
                break;
        case 3:
                /* change DataSN to -1 */
                iscsi_pdu_set_datasn(pdu, -1);
                break;
        case 4:
                /* change DataSN from (0,1) to (1,0) */
                datasn = scsi_get_uint32(&pdu->outdata.data[36]);
                iscsi_pdu_set_datasn(pdu, 1 - datasn);
                break;
        }
out:
        return orig_queue_pdu(iscsi, pdu);
}

void test_iscsi_datasn_invalid(void)
{
        int ret;

        CHECK_FOR_DATALOSS;
        CHECK_FOR_ISCSI(sd);

        logging(LOG_VERBOSE, LOG_BLANK_LINE);
        logging(LOG_VERBOSE, "Test sending invalid iSCSI DataSN");

        logging(LOG_VERBOSE, "Send two Data-Out PDU's with DataSN==0. Should fail.");
        change_datasn = 1;

        sd->iscsi_ctx->use_immediate_data = ISCSI_IMMEDIATE_DATA_NO;
        sd->iscsi_ctx->target_max_recv_data_segment_length = block_size;
        /* override transport queue_pdu callback for PDU manipulation */
        sd->iscsi_ctx->drv->queue_pdu = my_iscsi_queue_pdu;
        iscsi_set_noautoreconnect(sd->iscsi_ctx, 1);
        iscsi_set_timeout(sd->iscsi_ctx, 3);

        memset(scratch, 0xa6, 2 * block_size);

        ret = write10(sd, 100, 2 * block_size,
                      block_size, 0, 0, 0, 0, 0, scratch,
                      EXPECT_STATUS_GOOD);
        if (ret == -2) {
                logging(LOG_NORMAL, "[SKIPPED] WRITE10 is not implemented.");
                CU_PASS("WRITE10 is not implemented.");
                goto out_ctx_restore;
        }
        CU_ASSERT_NOT_EQUAL(ret, 0);

        iscsi_set_noautoreconnect(sd->iscsi_ctx, 0);

        logging(LOG_VERBOSE, "Send Data-Out PDU with DataSN==27. Should fail");
        change_datasn = 2;

        sd->iscsi_ctx->use_immediate_data = ISCSI_IMMEDIATE_DATA_NO;
        sd->iscsi_ctx->target_max_recv_data_segment_length = block_size;
        sd->iscsi_ctx->drv->queue_pdu = my_iscsi_queue_pdu;
        iscsi_set_noautoreconnect(sd->iscsi_ctx, 1);
        iscsi_set_timeout(sd->iscsi_ctx, 3);

        ret = write10(sd, 100, block_size,
                      block_size, 0, 0, 0, 0, 0, scratch,
                      EXPECT_STATUS_GOOD);
        CU_ASSERT_NOT_EQUAL(ret, 0);

        iscsi_set_noautoreconnect(sd->iscsi_ctx, 0);

        logging(LOG_VERBOSE, "Send Data-Out PDU with DataSN==-1. Should fail");
        change_datasn = 3;

        sd->iscsi_ctx->use_immediate_data = ISCSI_IMMEDIATE_DATA_NO;
        sd->iscsi_ctx->target_max_recv_data_segment_length = block_size;
        sd->iscsi_ctx->drv->queue_pdu = my_iscsi_queue_pdu;
        iscsi_set_noautoreconnect(sd->iscsi_ctx, 1);
        iscsi_set_timeout(sd->iscsi_ctx, 3);

        ret = write10(sd, 100, block_size,
                      block_size, 0, 0, 0, 0, 0, scratch,
                      EXPECT_STATUS_GOOD);
        CU_ASSERT_NOT_EQUAL(ret, 0);

        iscsi_set_noautoreconnect(sd->iscsi_ctx, 0);

        logging(LOG_VERBOSE, "Send Data-Out PDU's in reverse order (DataSN == 1,0). Should fail");
        change_datasn = 4;

        sd->iscsi_ctx->use_immediate_data = ISCSI_IMMEDIATE_DATA_NO;
        sd->iscsi_ctx->target_max_recv_data_segment_length = block_size;
        sd->iscsi_ctx->drv->queue_pdu = my_iscsi_queue_pdu;
        iscsi_set_noautoreconnect(sd->iscsi_ctx, 1);
        iscsi_set_timeout(sd->iscsi_ctx, 3);

        ret = write10(sd, 100, 2 * block_size,
                      block_size, 0, 0, 0, 0, 0, scratch,
                      EXPECT_STATUS_GOOD);
        CU_ASSERT_NOT_EQUAL(ret, 0);
out_ctx_restore:
        /* restore autoreconnect */
        iscsi_set_noautoreconnect(sd->iscsi_ctx, 0);
}