Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

4 files changed, 1171 insertions, 0 deletions

diff --git a/src/spdk/test/app/fuzz/iscsi_fuzz/.gitignore b/src/spdk/test/app/fuzz/iscsi_fuzz/.gitignore
new file mode 100644
index 000000000..3982bd220
--- /dev/null
+++ b/src/spdk/test/app/fuzz/iscsi_fuzz/.gitignore
@@ -0,0 +1 @@
+iscsi_fuzz
diff --git a/src/spdk/test/app/fuzz/iscsi_fuzz/Makefile b/src/spdk/test/app/fuzz/iscsi_fuzz/Makefile
new file mode 100644
index 000000000..0131e089a
--- /dev/null
+++ b/src/spdk/test/app/fuzz/iscsi_fuzz/Makefile
@@ -0,0 +1,51 @@
+#
+#  Copyright (c) Intel Corporation.
+#  All rights reserved.
+#
+#  Redistribution and use in source and binary forms, with or without
+#  modification, are permitted provided that the following conditions
+#  are met:
+#
+#    * Redistributions of source code must retain the above copyright
+#      notice, this list of conditions and the following disclaimer.
+#    * Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in
+#      the documentation and/or other materials provided with the
+#      distribution.
+#    * Neither the name of Intel Corporation nor the names of its
+#      contributors may be used to endorse or promote products derived
+#      from this software without specific prior written permission.
+#
+#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+#  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+#  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+#  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+#  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+#  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+#  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+#  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+#  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+#  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+
+SPDK_ROOT_DIR := $(abspath $(CURDIR)/../../../..)
+include $(SPDK_ROOT_DIR)/mk/spdk.common.mk
+include $(SPDK_ROOT_DIR)/mk/spdk.modules.mk
+
+APP = iscsi_fuzz
+
+CFLAGS += -I$(SPDK_ROOT_DIR)/lib
+CFLAGS += -I$(SPDK_ROOT_DIR)/include
+
+C_SRCS := iscsi_fuzz.c
+
+ISCSI_OBJS = md5 param conn tgt_node init_grp portal_grp
+
+LIBS += $(SCSI_OBJS:%=$(SPDK_ROOT_DIR)/lib/scsi/%.o)
+LIBS += $(ISCSI_OBJS:%=$(SPDK_ROOT_DIR)/lib/iscsi/%.o)
+
+SPDK_LIB_LIST += $(SOCK_MODULES_LIST)
+SPDK_LIB_LIST += conf event json jsonrpc log scsi bdev notify rpc sock thread trace util
+
+include $(SPDK_ROOT_DIR)/mk/spdk.app.mk
diff --git a/src/spdk/test/app/fuzz/iscsi_fuzz/README.md b/src/spdk/test/app/fuzz/iscsi_fuzz/README.md
new file mode 100644
index 000000000..c9ef02e6a
--- /dev/null
+++ b/src/spdk/test/app/fuzz/iscsi_fuzz/README.md
@@ -0,0 +1,27 @@
+# Overview
+
+This application is intended to fuzz test the iSCSI target by submitting
+randomized PDU commands through a simulated iSCSI initiator.
+
+# Input
+
+1. iSCSI initiator send a login request PDU to iSCSI Target. Once a session is connected,
+2. iSCSI initiator send huge amount and random PDUs continuously to iSCSI Target.
+3. iSCSI initiator send a logout request PDU to iSCSI Target in the end.
+Especially, iSCSI initiator need to build different bhs according to different bhs opcode.
+Then iSCSI initiator will receive all kinds of responsed opcodes from iSCSI Target.
+The application will terminate when run time expires (see the -t flag).
+
+# Output
+
+By default, the fuzzer will print commands that:
+1. Complete successfully back from the target, or
+2. Are outstanding at the time of a connection error occurs.
+Commands are dumped as named objects in json format which can then be supplied back to the
+script for targeted debugging on a subsequent run.
+
+At the end of each test run, a summary is printed in the following format:
+
+~~~
+device 0x11c3b90 stats: Sent 1543 valid opcode PDUs, 16215 invalid opcode PDUs.
+~~~
diff --git a/src/spdk/test/app/fuzz/iscsi_fuzz/iscsi_fuzz.c b/src/spdk/test/app/fuzz/iscsi_fuzz/iscsi_fuzz.c
new file mode 100644
index 000000000..359b95981
--- /dev/null
+++ b/src/spdk/test/app/fuzz/iscsi_fuzz/iscsi_fuzz.c
@@ -0,0 +1,1092 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright (c) Intel Corporation.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "spdk/stdinc.h"
+#include "spdk/conf.h"
+#include "spdk/event.h"
+#include "spdk/util.h"
+#include "spdk/string.h"
+#include "spdk/likely.h"
+#include "spdk/json.h"
+#include "spdk/endian.h"
+#include "spdk/bdev.h"
+#include "spdk/notify.h"
+#include "spdk/scsi.h"
+#include "spdk_internal/mock.h"
+#include "spdk/scsi_spec.h"
+#include "iscsi/conn.h"
+#include "iscsi/iscsi.c"
+#include "scsi/scsi_internal.h"
+#include "spdk/sock.h"
+
+#define GET_PDU_LOOP_COUNT	16
+#define DEFAULT_RUNTIME		30	/* seconds */
+#define MAX_RUNTIME_S		86400	/* 24 hours */
+
+/* Global run state */
+uint64_t		g_runtime_ticks;
+int			g_runtime;
+int			g_num_active_threads;
+bool			g_run = true;
+bool			g_is_valid_opcode = true;
+
+struct spdk_log_flag SPDK_LOG_ISCSI = {
+	.name = "iscsi",
+	.enabled = false,
+};
+
+/* Global resources */
+TAILQ_HEAD(, spdk_iscsi_pdu)		g_get_pdu_list;
+TAILQ_HEAD(, fuzz_iscsi_dev_ctx)	g_dev_list = TAILQ_HEAD_INITIALIZER(g_dev_list);
+struct spdk_poller			*g_app_completion_poller;
+void					*g_valid_buffer;
+unsigned int				g_random_seed;
+char					*g_tgt_ip = "127.0.0.1";
+char					*g_tgt_port = "3260";
+/* TBD: Discovery login to get target information. We use fixed IQN for target for now. */
+char					*g_tgt_name = "iqn.2016-06.io.spdk:disk1";
+char					*g_init_name = "iqn.2016-06.io.spdk:fuzzinit";
+
+struct fuzz_iscsi_iov_ctx {
+	struct iovec			iov_req;
+	struct iovec			iov_data;
+	struct iovec			iov_resp;
+};
+
+struct fuzz_iscsi_io_ctx {
+	struct fuzz_iscsi_iov_ctx		iov_ctx;
+	union {
+		struct iscsi_bhs		*bhs;
+		struct iscsi_bhs_nop_out	*nop_out_req;
+		struct iscsi_bhs_scsi_req	*scsi_req;
+		struct iscsi_bhs_task_req	*task_req;
+		struct iscsi_bhs_login_req	*login_req;
+		struct iscsi_bhs_text_req	*text_req;
+		struct iscsi_bhs_data_out	*data_out_req;
+		struct iscsi_bhs_logout_req	*logout_req;
+		struct iscsi_bhs_snack_req	*snack_req;
+	} req;
+};
+
+struct fuzz_iscsi_dev_ctx {
+	struct spdk_iscsi_sess			sess;
+	struct spdk_iscsi_conn			*conn;
+	struct fuzz_iscsi_io_ctx		io_ctx;
+
+	struct spdk_thread			*thread;
+	struct spdk_poller			*poller;
+	unsigned int				random_seed, current_cmd_sn;
+	uint64_t				num_sent_pdus;
+	uint64_t				num_valid_pdus;
+
+	TAILQ_ENTRY(fuzz_iscsi_dev_ctx)		link;
+};
+
+static void
+fuzz_fill_random_bytes(char *character_repr, size_t len, unsigned int *rand_seed)
+{
+	size_t i;
+
+	for (i = 0; i < len; i++) {
+		character_repr[i] = rand_r(rand_seed) % UINT8_MAX;
+	}
+}
+
+static char *
+fuzz_get_value_base_64_buffer(void *item, size_t len)
+{
+	char *value_string;
+	size_t total_size;
+	int rc;
+
+	/* Null pointer */
+	total_size = spdk_base64_get_encoded_strlen(len) + 1;
+
+	value_string = calloc(1, total_size);
+	if (value_string == NULL) {
+		return NULL;
+	}
+
+	rc = spdk_base64_encode(value_string, item, len);
+	if (rc < 0) {
+		free(value_string);
+		return NULL;
+	}
+
+	return value_string;
+}
+
+int
+iscsi_chap_get_authinfo(struct iscsi_chap_auth *auth, const char *authuser,
+			int ag_tag)
+{
+	return 0;
+}
+
+void
+shutdown_iscsi_conns_done(void)
+{
+	return;
+}
+
+void
+iscsi_put_pdu(struct spdk_iscsi_pdu *pdu)
+{
+	if (!pdu) {
+		return;
+	}
+
+	pdu->ref--;
+	if (pdu->ref < 0) {
+		pdu->ref = 0;
+	}
+
+	if (pdu->ref == 0) {
+		if (pdu->data) {
+			free(pdu->data);
+		}
+		free(pdu);
+	}
+}
+
+struct spdk_iscsi_pdu *
+iscsi_get_pdu(struct spdk_iscsi_conn *conn)
+{
+	struct spdk_iscsi_pdu *pdu;
+
+	pdu = calloc(1, sizeof(*pdu));
+	if (!pdu) {
+		return NULL;
+	}
+
+	pdu->ref = 1;
+	pdu->conn = conn;
+
+	return pdu;
+}
+
+static void
+iscsi_task_free(struct spdk_scsi_task *scsi_task)
+{
+	struct spdk_iscsi_task *task = iscsi_task_from_scsi_task(scsi_task);
+
+	assert(task->parent == NULL);
+
+	iscsi_task_disassociate_pdu(task);
+	assert(task->conn->pending_task_cnt > 0);
+	task->conn->pending_task_cnt--;
+	free(task);
+}
+
+struct spdk_iscsi_task *
+iscsi_task_get(struct spdk_iscsi_conn *conn, struct spdk_iscsi_task *parent,
+	       spdk_scsi_task_cpl cpl_fn)
+{
+	struct spdk_iscsi_task *task;
+
+	/* iSCSI subtask is not necessary for now. */
+	assert(parent == NULL);
+
+	task = calloc(1, sizeof(*task));
+	if (!task) {
+		printf("Unable to get task\n");
+		abort();
+	}
+
+	task->conn = conn;
+	assert(conn->pending_task_cnt < UINT32_MAX);
+	conn->pending_task_cnt++;
+	spdk_scsi_task_construct(&task->scsi, cpl_fn, iscsi_task_free);
+
+	return task;
+}
+
+static void
+cleanup(void)
+{
+	struct fuzz_iscsi_dev_ctx *dev_ctx, *tmp;
+
+	TAILQ_FOREACH_SAFE(dev_ctx, &g_dev_list, link, tmp) {
+		printf("device %p stats: Sent %lu valid opcode PDUs, %lu invalid opcode PDUs.\n",
+		       dev_ctx, dev_ctx->num_valid_pdus,
+		       dev_ctx->num_sent_pdus - dev_ctx->num_valid_pdus);
+		free(dev_ctx);
+	}
+
+	spdk_free(g_valid_buffer);
+}
+
+/* data dumping functions begin */
+static int
+dump_iscsi_cmd(void *ctx, const void *data, size_t size)
+{
+	fprintf(stderr, "%s\n", (const char *)data);
+	return 0;
+}
+
+static void
+print_scsi_io_data(struct spdk_json_write_ctx *w, struct fuzz_iscsi_io_ctx *io_ctx)
+{
+	char *data_segment_len;
+
+	data_segment_len = fuzz_get_value_base_64_buffer((void *)io_ctx->req.bhs->data_segment_len,
+			   sizeof(io_ctx->req.bhs->data_segment_len));
+
+	spdk_json_write_named_uint32(w, "opcode", io_ctx->req.bhs->opcode);
+	spdk_json_write_named_uint32(w, "immediate", io_ctx->req.bhs->immediate);
+	spdk_json_write_named_uint32(w, "reserved", io_ctx->req.bhs->reserved);
+	spdk_json_write_named_uint32(w, "total_ahs_len", io_ctx->req.bhs->total_ahs_len);
+	spdk_json_write_named_string(w, "data_segment_len", data_segment_len);
+	spdk_json_write_named_uint32(w, "itt", io_ctx->req.bhs->itt);
+	spdk_json_write_named_uint32(w, "exp_stat_sn", io_ctx->req.bhs->exp_stat_sn);
+
+	free(data_segment_len);
+}
+
+static void
+print_req_obj(struct fuzz_iscsi_dev_ctx *dev_ctx, struct fuzz_iscsi_io_ctx *io_ctx)
+{
+	struct spdk_json_write_ctx *w;
+
+	w = spdk_json_write_begin(dump_iscsi_cmd, NULL, SPDK_JSON_WRITE_FLAG_FORMATTED);
+	spdk_json_write_named_object_begin(w, "bhs");
+	print_scsi_io_data(w, io_ctx);
+	spdk_json_write_object_end(w);
+	spdk_json_write_end(w);
+}
+
+/* data dumping functions end */
+
+/* dev initialization begin */
+static int
+fuzz_iscsi_dev_init(void)
+{
+	struct fuzz_iscsi_dev_ctx *dev_ctx;
+	int rc = 0;
+
+	dev_ctx = calloc(1, sizeof(*dev_ctx));
+	if (dev_ctx == NULL) {
+		return -ENOMEM;
+	}
+
+	dev_ctx->thread = spdk_get_thread();
+	if (dev_ctx->thread == NULL) {
+		fprintf(stderr, "Unable to get a thread for a fuzz device.\n");
+		rc = -EINVAL;
+		goto error_out;
+	}
+
+	dev_ctx->current_cmd_sn = 0;
+
+	TAILQ_INSERT_TAIL(&g_dev_list, dev_ctx, link);
+	return 0;
+
+error_out:
+	free(dev_ctx);
+	return rc;
+}
+/* dev initialization end */
+
+/* build requests begin */
+static void
+prep_iscsi_pdu_bhs_opcode_cmd(struct fuzz_iscsi_dev_ctx *dev_ctx, struct fuzz_iscsi_io_ctx *io_ctx)
+{
+	io_ctx->iov_ctx.iov_req.iov_len = sizeof(struct iscsi_bhs);
+	fuzz_fill_random_bytes((char *)io_ctx->req.bhs, sizeof(struct iscsi_bhs),
+			       &dev_ctx->random_seed);
+}
+/* build requests end */
+
+static int
+iscsi_pdu_hdr_op_login_rsp(struct spdk_iscsi_conn *conn, struct spdk_iscsi_pdu *pdu)
+{
+	return 0;
+}
+
+static int
+iscsi_fuzz_pdu_hdr_handle(struct spdk_iscsi_conn *conn, struct spdk_iscsi_pdu *pdu)
+{
+	int opcode;
+	int rc = 0;
+
+	opcode = pdu->bhs.opcode;
+	if (opcode == ISCSI_OP_LOGIN_RSP) {
+		return iscsi_pdu_hdr_op_login_rsp(conn, pdu);
+	}
+
+	switch (opcode) {
+	case ISCSI_OP_LOGOUT_RSP:
+		fprintf(stderr, "Received logout hdr_handle response opcode(0x26) from Target.\n");
+		conn->is_logged_out = true;
+		break;
+	case ISCSI_OP_NOPIN:
+	case ISCSI_OP_SCSI_RSP:
+	case ISCSI_OP_TASK_RSP:
+	case ISCSI_OP_TEXT_RSP:
+	case ISCSI_OP_SCSI_DATAIN:
+	case ISCSI_OP_R2T:
+	case ISCSI_OP_ASYNC:
+	case ISCSI_OP_VENDOR_3C:
+	case ISCSI_OP_VENDOR_3D:
+	case ISCSI_OP_VENDOR_3E:
+		fprintf(stderr, "Received hdr_handle response opcode from Target is 0x%x.\n", pdu->bhs.opcode);
+		break;
+	case ISCSI_OP_REJECT:
+		fprintf(stderr, "Received rejected hdr_handle response opcode(0x3f) from Target.\n");
+		break;
+	default:
+		rc = -1;
+		break;
+	}
+
+	return rc;
+}
+
+static int
+iscsi_pdu_payload_op_login_rsp(struct spdk_iscsi_conn *conn, struct spdk_iscsi_pdu *pdu)
+{
+	struct iscsi_bhs_login_rsp *rsph;
+
+	rsph = (struct iscsi_bhs_login_rsp *)&pdu->bhs;
+	if (rsph == NULL) {
+		return -1;
+	}
+
+	assert(rsph->tsih != 0);
+	assert(rsph->status_class == 0);
+	assert(ISCSI_BHS_LOGIN_GET_TBIT(rsph->flags));
+	assert(!(rsph->flags & ISCSI_LOGIN_CONTINUE));
+	assert((rsph->flags & ISCSI_LOGIN_NEXT_STAGE_MASK) == ISCSI_LOGIN_NEXT_STAGE_3);
+
+	/* We got the Login Final Response and move to Full-Feature Phase. */
+	conn->full_feature = 1;
+	return 0;
+}
+
+static int
+iscsi_fuzz_pdu_payload_handle(struct spdk_iscsi_conn *conn, struct spdk_iscsi_pdu *pdu)
+{
+	int opcode;
+	int rc = 0;
+
+	opcode = pdu->bhs.opcode;
+	fprintf(stderr, "Received payload_handle response opcode from Target is 0x%x.\n", opcode);
+
+	switch (opcode) {
+	case ISCSI_OP_LOGIN_RSP:
+		rc = iscsi_pdu_payload_op_login_rsp(conn, pdu);
+		break;
+	case ISCSI_OP_NOPIN:
+	case ISCSI_OP_SCSI_RSP:
+	case ISCSI_OP_TASK_RSP:
+	case ISCSI_OP_TEXT_RSP:
+	case ISCSI_OP_SCSI_DATAIN:
+	case ISCSI_OP_R2T:
+	case ISCSI_OP_ASYNC:
+	case ISCSI_OP_VENDOR_3C:
+	case ISCSI_OP_VENDOR_3D:
+	case ISCSI_OP_VENDOR_3E:
+	case ISCSI_OP_REJECT:
+		break;
+	default:
+		rc = -1;
+		break;
+	}
+
+	return rc;
+}
+
+static int
+iscsi_fuzz_read_pdu(struct spdk_iscsi_conn *conn)
+{
+	enum iscsi_pdu_recv_state prev_state;
+	struct spdk_iscsi_pdu *pdu;
+	uint32_t data_len;
+	int rc;
+
+	do {
+		prev_state = conn->pdu_recv_state;
+		pdu = conn->pdu_in_progress;
+
+		switch (conn->pdu_recv_state) {
+		case ISCSI_PDU_RECV_STATE_AWAIT_PDU_READY:
+			assert(conn->pdu_in_progress == NULL);
+
+			conn->pdu_in_progress = iscsi_get_pdu(conn);
+			if (conn->pdu_in_progress == NULL) {
+				return SPDK_ISCSI_CONNECTION_FATAL;
+			}
+			TAILQ_INSERT_TAIL(&g_get_pdu_list, conn->pdu_in_progress, tailq);
+			conn->pdu_recv_state = ISCSI_PDU_RECV_STATE_AWAIT_PDU_HDR;
+			break;
+		case ISCSI_PDU_RECV_STATE_AWAIT_PDU_HDR:
+			if (pdu->bhs_valid_bytes < ISCSI_BHS_LEN) {
+				rc = iscsi_conn_read_data(conn,
+							  ISCSI_BHS_LEN - pdu->bhs_valid_bytes,
+							  (uint8_t *)&pdu->bhs + pdu->bhs_valid_bytes);
+				if (rc < 0) {
+					conn->pdu_recv_state = ISCSI_PDU_RECV_STATE_ERROR;
+					break;
+				}
+				pdu->bhs_valid_bytes += rc;
+				if (pdu->bhs_valid_bytes < ISCSI_BHS_LEN) {
+					return 0;
+				}
+			}
+
+			pdu->data_segment_len = ISCSI_ALIGN(DGET24(pdu->bhs.data_segment_len));
+
+			rc = iscsi_fuzz_pdu_hdr_handle(conn, pdu);
+			if (rc < 0) {
+				printf("Critical error is detected. Close the connection\n");
+				conn->pdu_recv_state = ISCSI_PDU_RECV_STATE_ERROR;
+				break;
+			}
+
+			if (conn->is_logged_out) {
+				printf("pdu received after logout\n");
+				conn->pdu_recv_state = ISCSI_PDU_RECV_STATE_ERROR;
+				break;
+			}
+
+			conn->pdu_recv_state = ISCSI_PDU_RECV_STATE_AWAIT_PDU_PAYLOAD;
+			break;
+		case ISCSI_PDU_RECV_STATE_AWAIT_PDU_PAYLOAD:
+			data_len = pdu->data_segment_len;
+			if (data_len != 0 && pdu->data_buf == NULL) {
+				pdu->data_buf = calloc(1, data_len);
+				if (pdu->data_buf == NULL) {
+					return 0;
+				}
+				pdu->data = pdu->data_buf;
+			}
+
+			/* copy the actual data into local buffer */
+			if (pdu->data_valid_bytes < data_len) {
+				rc = iscsi_conn_read_data_segment(conn, pdu, data_len);
+				if (rc < 0) {
+					conn->pdu_recv_state = ISCSI_PDU_RECV_STATE_ERROR;
+					break;
+				}
+				pdu->data_valid_bytes += rc;
+				if (pdu->data_valid_bytes < data_len) {
+					return 0;
+				}
+			}
+
+			/* All data for this PDU has now been read from the socket. */
+			spdk_trace_record(TRACE_ISCSI_READ_PDU, conn->id, pdu->data_valid_bytes,
+					  (uintptr_t)pdu, pdu->bhs.opcode);
+
+			if (!pdu->is_rejected) {
+				rc = iscsi_fuzz_pdu_payload_handle(conn, pdu);
+			} else {
+				rc = 0;
+			}
+			if (rc == 0) {
+				spdk_trace_record(TRACE_ISCSI_TASK_EXECUTED, 0, 0, (uintptr_t)pdu, 0);
+				conn->pdu_in_progress = NULL;
+				conn->pdu_recv_state = ISCSI_PDU_RECV_STATE_AWAIT_PDU_READY;
+				return 1;
+			} else {
+				conn->pdu_recv_state = ISCSI_PDU_RECV_STATE_ERROR;
+			}
+			break;
+		case ISCSI_PDU_RECV_STATE_ERROR:
+			return SPDK_ISCSI_CONNECTION_FATAL;
+		default:
+			assert(false);
+			printf("code should not come here\n");
+			break;
+		}
+	} while (prev_state != conn->pdu_recv_state);
+
+	return 0;
+}
+
+#define GET_PDU_LOOP_COUNT	16
+
+static int
+fuzz_iscsi_handle_incoming_pdus(struct spdk_iscsi_conn *conn)
+{
+	int i, rc;
+
+	/* Read new PDUs from network */
+	for (i = 0; i < GET_PDU_LOOP_COUNT; i++) {
+		rc = iscsi_fuzz_read_pdu(conn);
+		if (rc == 0) {
+			break;
+		} else if (rc < 0) {
+			return rc;
+		}
+	}
+
+	return i;
+}
+
+static void
+fuzz_iscsi_send_login_request(struct fuzz_iscsi_dev_ctx *dev_ctx, uint8_t session_type)
+{
+	struct fuzz_iscsi_io_ctx *io_ctx = NULL;
+	struct spdk_iscsi_pdu *req_pdu;
+	struct iscsi_bhs_login_req *login_req;
+	struct spdk_iscsi_conn *conn = dev_ctx->conn;
+
+	req_pdu = iscsi_get_pdu(conn);
+	req_pdu->writev_offset = 0;
+	req_pdu->hdigest_valid_bytes = 0;
+	req_pdu->ahs_valid_bytes = 0;
+	req_pdu->data_buf_len = 8192;
+	req_pdu->data = calloc(1, 8192);
+	assert(req_pdu->data != NULL);
+	req_pdu->data_segment_len = 0;
+
+	login_req = (struct iscsi_bhs_login_req *)&req_pdu->bhs;
+	io_ctx = &dev_ctx->io_ctx;
+	io_ctx->req.login_req = login_req;
+	io_ctx->req.login_req->version_min = 0;
+	/* a new session */
+	io_ctx->req.login_req->tsih = 0;
+
+	req_pdu->bhs.opcode = ISCSI_OP_LOGIN;
+	req_pdu->bhs.immediate = 1;
+	req_pdu->bhs.reserved = 0;
+	req_pdu->bhs_valid_bytes = ISCSI_BHS_LEN;
+	req_pdu->bhs.total_ahs_len = 0;
+
+	/* An initiator that chooses to operate without iSCSI security and with
+	 * all the operational parameters taking the default values issues the
+	 * Login with the T bit set to 1, the CSG set to
+	 * LoginOperationalNegotiation, and the NSG set to FullFeaturePhase.
+	 *
+	 * Byte /	   0	   |	   1	   |	   2	   |	   3	   |
+	 *	   |0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|0 1 2 3 4 5 6 7|
+	 *	   +---------------+---------------+---------------+---------------+
+	 *	  0|.|1| 0x03	   |T|C|.|.|CSG|NSG| Version-max   | Version-min   |
+	 */
+	req_pdu->bhs.flags = ISCSI_LOGIN_TRANSIT | (ISCSI_OPERATIONAL_NEGOTIATION_PHASE << 2) |
+			     ISCSI_FULL_FEATURE_PHASE;
+
+	req_pdu->data_segment_len = iscsi_append_text(conn, "InitiatorName", g_init_name,
+				    req_pdu->data, req_pdu->data_buf_len, req_pdu->data_segment_len);
+	req_pdu->data_segment_len = iscsi_append_text(conn, "HeaderDigest", "None",
+				    req_pdu->data, req_pdu->data_buf_len, req_pdu->data_segment_len);
+	req_pdu->data_segment_len = iscsi_append_text(conn, "DataDigest", "None",
+				    req_pdu->data, req_pdu->data_buf_len, req_pdu->data_segment_len);
+	req_pdu->data_segment_len = iscsi_append_text(conn, "DefaultTime2Wait", "2",
+				    req_pdu->data, req_pdu->data_buf_len, req_pdu->data_segment_len);
+	req_pdu->data_segment_len = iscsi_append_text(conn, "DefaultTime2Retain", "0",
+				    req_pdu->data, req_pdu->data_buf_len, req_pdu->data_segment_len);
+	req_pdu->data_segment_len = iscsi_append_text(conn, "IFMarker", "No",
+				    req_pdu->data, req_pdu->data_buf_len, req_pdu->data_segment_len);
+	req_pdu->data_segment_len = iscsi_append_text(conn, "OFMarker", "No",
+				    req_pdu->data, req_pdu->data_buf_len, req_pdu->data_segment_len);
+	req_pdu->data_segment_len = iscsi_append_text(conn, "ErrorRecoveryLevel", "0",
+				    req_pdu->data, req_pdu->data_buf_len, req_pdu->data_segment_len);
+
+	if (session_type == SESSION_TYPE_DISCOVERY) {
+		/* Discovery PDU */
+		conn->sess->session_type = SESSION_TYPE_DISCOVERY;
+		req_pdu->data_segment_len = iscsi_append_text(conn, "SessionType", "Discovery",
+					    req_pdu->data, req_pdu->data_buf_len, req_pdu->data_segment_len);
+		req_pdu->data_segment_len = iscsi_append_text(conn, "MaxRecvDataSegmentLength", "32768",
+					    req_pdu->data, req_pdu->data_buf_len, req_pdu->data_segment_len);
+	} else {
+		/* Login PDU */
+		conn->sess->session_type = SESSION_TYPE_NORMAL;
+		req_pdu->data_segment_len = iscsi_append_text(conn, "SessionType", "Normal",
+					    req_pdu->data, req_pdu->data_buf_len, req_pdu->data_segment_len);
+		req_pdu->data_segment_len = iscsi_append_text(conn, "TargetName", g_tgt_name,
+					    req_pdu->data, req_pdu->data_buf_len, req_pdu->data_segment_len);
+		req_pdu->data_segment_len = iscsi_append_text(conn, "InitialR2T", "No",
+					    req_pdu->data, req_pdu->data_buf_len, req_pdu->data_segment_len);
+		req_pdu->data_segment_len = iscsi_append_text(conn, "ImmediateData", "Yes",
+					    req_pdu->data, req_pdu->data_buf_len, req_pdu->data_segment_len);
+		req_pdu->data_segment_len = iscsi_append_text(conn, "MaxBurstLength", "16776192",
+					    req_pdu->data, req_pdu->data_buf_len, req_pdu->data_segment_len);
+		req_pdu->data_segment_len = iscsi_append_text(conn, "FirstBurstLength", "262144",
+					    req_pdu->data, req_pdu->data_buf_len, req_pdu->data_segment_len);
+		req_pdu->data_segment_len = iscsi_append_text(conn, "MaxOutstandingR2T", "1",
+					    req_pdu->data, req_pdu->data_buf_len, req_pdu->data_segment_len);
+		req_pdu->data_segment_len = iscsi_append_text(conn, "MaxConnections", "1",
+					    req_pdu->data, req_pdu->data_buf_len, req_pdu->data_segment_len);
+		req_pdu->data_segment_len = iscsi_append_text(conn, "DataPDUInOrder", "Yes",
+					    req_pdu->data, req_pdu->data_buf_len, req_pdu->data_segment_len);
+		req_pdu->data_segment_len = iscsi_append_text(conn, "DataSequenceInOrder", "Yes",
+					    req_pdu->data, req_pdu->data_buf_len, req_pdu->data_segment_len);
+		req_pdu->data_segment_len = iscsi_append_text(conn, "MaxRecvDataSegmentLength", "262144",
+					    req_pdu->data, req_pdu->data_buf_len, req_pdu->data_segment_len);
+	}
+
+	DSET24(req_pdu->bhs.data_segment_len, req_pdu->data_segment_len);
+	iscsi_conn_write_pdu(conn, req_pdu, iscsi_conn_pdu_generic_complete, NULL);
+}
+
+static void
+fuzz_iscsi_send_logout_request(struct fuzz_iscsi_dev_ctx *dev_ctx)
+{
+	struct fuzz_iscsi_io_ctx *io_ctx = NULL;
+	struct spdk_iscsi_pdu *req_pdu;
+	struct iscsi_bhs_logout_req *logout_req;
+	struct spdk_iscsi_conn *conn = dev_ctx->conn;
+
+	conn->is_logged_out = true;
+
+	req_pdu = iscsi_get_pdu(conn);
+	req_pdu->writev_offset = 0;
+	req_pdu->hdigest_valid_bytes = 0;
+	req_pdu->ahs_valid_bytes = 0;
+	req_pdu->data_buf_len = 0;
+
+	logout_req = (struct iscsi_bhs_logout_req *)&req_pdu->bhs;
+	io_ctx = &dev_ctx->io_ctx;
+	io_ctx->req.logout_req = logout_req;
+
+	req_pdu->bhs.opcode = ISCSI_OP_LOGOUT;
+	req_pdu->bhs.immediate = 1;
+	req_pdu->bhs.reserved = 0;
+	req_pdu->bhs_valid_bytes = ISCSI_BHS_LEN;
+	req_pdu->bhs.total_ahs_len = 0;
+	req_pdu->bhs.flags = 0;
+
+	DSET24(req_pdu->bhs.data_segment_len, 0);
+	iscsi_conn_write_pdu(conn, req_pdu, iscsi_conn_pdu_generic_complete, conn);
+}
+
+static void
+iscsi_fuzz_conn_reset(struct spdk_iscsi_conn *conn, struct spdk_iscsi_sess *sess)
+{
+	conn->sess = sess;
+	conn->data_in_cnt = 0;
+	conn->params = NULL;
+	conn->header_digest = true;
+	conn->data_digest = false;
+	conn->header_digest = 0;
+	conn->MaxRecvDataSegmentLength = 8192;
+	conn->full_feature = 0;
+	conn->pdu_recv_state = ISCSI_PDU_RECV_STATE_AWAIT_PDU_READY;
+	conn->pdu_in_progress = NULL;
+	conn->is_logged_out = 0;
+}
+
+static void
+iscsi_fuzz_sock_connect(struct spdk_iscsi_conn *conn)
+{
+	const char *host = g_tgt_ip;
+	const char *port = g_tgt_port;
+	char saddr[INET6_ADDRSTRLEN], caddr[INET6_ADDRSTRLEN];
+	uint16_t cport, sport;
+	int rc = 0;
+
+	conn->sock = spdk_sock_connect(host, spdk_strtol(port, 10), NULL);
+	if (conn->sock == NULL) {
+		fprintf(stderr, "connect error(%d): %s\n", errno, spdk_strerror(errno));
+		spdk_sock_close(&conn->sock);
+		return;
+	}
+	fprintf(stderr, "\nConnecting to the server on %s:%s\n", host, port);
+
+	rc = spdk_sock_getaddr(conn->sock, saddr, sizeof(saddr), &sport, caddr, sizeof(caddr), &cport);
+	if (rc < 0) {
+		fprintf(stderr, "Cannot get connection addresses\n");
+		spdk_sock_close(&conn->sock);
+		return;
+	}
+
+	fprintf(stderr, "Connection accepted from (%s, %hu) to (%s, %hu)\n", caddr, cport, saddr, sport);
+
+}
+
+static void
+check_successful_op(struct fuzz_iscsi_dev_ctx *dev_ctx, struct fuzz_iscsi_io_ctx *io_ctx)
+{
+	if (g_is_valid_opcode) {
+		fprintf(stderr, "Sent a valid opcode PDU.\n");
+		dev_ctx->num_valid_pdus++;
+	} else {
+		fprintf(stderr, "Sent an invalid opcode PDU.\n");
+	}
+}
+
+/* submit requests begin */
+static void
+dev_submit_requests(struct fuzz_iscsi_dev_ctx *dev_ctx)
+{
+	struct fuzz_iscsi_io_ctx *io_ctx = NULL;
+	uint8_t opcode;
+	struct spdk_iscsi_pdu *req_pdu;
+	struct iscsi_bhs *bhs;
+	struct iscsi_bhs_nop_out *nop_out_req;
+	struct iscsi_bhs_scsi_req *scsi_req;
+	struct iscsi_bhs_task_req *task_req;
+	struct iscsi_bhs_text_req *text_req;
+	struct iscsi_bhs_data_out *data_out_req;
+	struct iscsi_bhs_snack_req *snack_req;
+	unsigned int rand_seed;
+	bool is_p99;
+
+	g_is_valid_opcode = true;
+
+	/* Random PDU */
+	opcode = rand() % 0x3f;
+	fprintf(stderr,	"Random request bhs.opcode of Initiator is 0x%x.\n", opcode);
+
+	if ((opcode == ISCSI_OP_LOGIN) || (opcode == ISCSI_OP_LOGOUT)) {
+		/* only need send next */
+		fprintf(stderr, "LOGIN and LOGOUT opcodes are ignored here.\n");
+		return;
+	}
+
+	req_pdu = iscsi_get_pdu(dev_ctx->conn);
+	req_pdu->writev_offset = 0;
+	req_pdu->hdigest_valid_bytes = 0;
+	req_pdu->ahs_valid_bytes = 0;
+	req_pdu->data_buf_len = 0;
+
+	dev_ctx->conn->sess->session_type = SESSION_TYPE_NORMAL;
+
+	io_ctx = &dev_ctx->io_ctx;
+
+	switch (opcode) {
+	case ISCSI_OP_NOPOUT:
+		nop_out_req = (struct iscsi_bhs_nop_out *)&req_pdu->bhs;
+		io_ctx->req.nop_out_req = nop_out_req;
+		break;
+	case ISCSI_OP_SCSI:
+		scsi_req = (struct iscsi_bhs_scsi_req *)&req_pdu->bhs;
+		io_ctx->req.scsi_req = scsi_req;
+		break;
+	case ISCSI_OP_TASK:
+		task_req = (struct iscsi_bhs_task_req *)&req_pdu->bhs;
+		io_ctx->req.task_req = task_req;
+		break;
+	case ISCSI_OP_TEXT:
+		text_req = (struct iscsi_bhs_text_req *)&req_pdu->bhs;
+		io_ctx->req.text_req = text_req;
+		break;
+	case ISCSI_OP_SCSI_DATAOUT:
+		data_out_req = (struct iscsi_bhs_data_out *)&req_pdu->bhs;
+		io_ctx->req.data_out_req = data_out_req;
+		break;
+	case ISCSI_OP_SNACK:
+		snack_req = (struct iscsi_bhs_snack_req *)&req_pdu->bhs;
+		io_ctx->req.snack_req = snack_req;
+		break;
+	default:
+		bhs = (struct iscsi_bhs *)&req_pdu->bhs;
+		io_ctx->req.bhs = bhs;
+		g_is_valid_opcode = false;
+		break;
+	}
+
+	prep_iscsi_pdu_bhs_opcode_cmd(dev_ctx, io_ctx);
+	io_ctx->req.bhs->opcode = opcode;
+	req_pdu->bhs.opcode = opcode;
+	req_pdu->bhs.immediate = 1;
+	req_pdu->bhs.reserved = 0;
+	req_pdu->bhs_valid_bytes = ISCSI_BHS_LEN;
+	req_pdu->bhs.total_ahs_len = 0;
+	req_pdu->bhs.stat_sn = 0;
+	DSET24(req_pdu->bhs.data_segment_len, 0);
+
+	if (opcode <= ISCSI_OP_TEXT) {
+		rand_seed = time(NULL);
+		is_p99 = rand_r(&rand_seed) % 100 == 0 ? true : false;
+		if (!is_p99) { /* Remaining 1% */
+			switch (opcode) {
+			case ISCSI_OP_NOPOUT:
+				if (req_pdu->bhs.immediate) {
+					io_ctx->req.nop_out_req->cmd_sn = dev_ctx->current_cmd_sn;
+				} else {
+					io_ctx->req.nop_out_req->cmd_sn = dev_ctx->current_cmd_sn++;
+				}
+				break;
+			case ISCSI_OP_SCSI:
+				if (req_pdu->bhs.immediate) {
+					io_ctx->req.scsi_req->cmd_sn = dev_ctx->current_cmd_sn;
+				} else {
+					io_ctx->req.scsi_req->cmd_sn = dev_ctx->current_cmd_sn++;
+				}
+				break;
+			case ISCSI_OP_TASK:
+				if (req_pdu->bhs.immediate) {
+					io_ctx->req.task_req->cmd_sn = dev_ctx->current_cmd_sn;
+				} else {
+					io_ctx->req.task_req->cmd_sn = dev_ctx->current_cmd_sn++;
+				}
+				break;
+			case ISCSI_OP_TEXT:
+				if (req_pdu->bhs.immediate) {
+					io_ctx->req.text_req->cmd_sn = dev_ctx->current_cmd_sn;
+				} else {
+					io_ctx->req.text_req->cmd_sn = dev_ctx->current_cmd_sn++;
+				}
+				break;
+			default:
+				break;
+			}
+		}
+	}
+
+	if (opcode == ISCSI_OP_SCSI) {
+		/* avoid ((R_bit != 0) && (W_bit != 0)) is true */
+		io_ctx->req.scsi_req->read_bit = 0;
+		io_ctx->req.scsi_req->write_bit = 0;
+	}
+
+	if (opcode == ISCSI_OP_TEXT) {
+		/* avoid: (F_bit && C_bit) is true */
+		io_ctx->req.text_req->flags = 0;
+		/* avoid: correct itt is not equal to the current itt */
+		io_ctx->req.text_req->itt = 0;
+	}
+
+	fprintf(stderr, "Dumping this request bhs contents now.\n");
+	print_req_obj(dev_ctx, io_ctx);
+
+	check_successful_op(dev_ctx, io_ctx);
+	dev_ctx->num_sent_pdus++;
+
+	iscsi_conn_write_pdu(dev_ctx->conn, req_pdu,
+			     iscsi_conn_pdu_generic_complete, NULL);
+}
+/* submit requests end */
+
+static int
+poll_dev(void *ctx)
+{
+	struct fuzz_iscsi_dev_ctx *dev_ctx = ctx;
+	struct spdk_iscsi_conn *conn = dev_ctx->conn;
+	uint64_t current_ticks;
+	struct spdk_iscsi_pdu *pdu, *tmp;
+
+	current_ticks = spdk_get_ticks();
+	if (current_ticks > g_runtime_ticks) {
+		g_run = false;
+	}
+
+	if (!g_run) {
+		/* Logout PDU */
+		fuzz_iscsi_send_logout_request(dev_ctx);
+		fuzz_iscsi_handle_incoming_pdus(conn);
+
+		TAILQ_FOREACH_SAFE(pdu, &g_get_pdu_list, tailq, tmp) {
+			TAILQ_REMOVE(&g_get_pdu_list, pdu, tailq);
+			iscsi_put_pdu(pdu);
+		}
+
+		spdk_sock_close(&conn->sock);
+
+		TAILQ_FOREACH_SAFE(pdu, &conn->write_pdu_list, tailq, tmp) {
+			TAILQ_REMOVE(&conn->write_pdu_list, pdu, tailq);
+			iscsi_put_pdu(pdu);
+		}
+
+		free(conn);
+
+		spdk_poller_unregister(&dev_ctx->poller);
+		__sync_sub_and_fetch(&g_num_active_threads, 1);
+
+		return -1;
+	}
+
+	if (conn->is_logged_out) {
+		spdk_sock_close(&conn->sock);
+		iscsi_fuzz_conn_reset(conn, &dev_ctx->sess);
+		iscsi_fuzz_sock_connect(conn);
+		usleep(1000);
+
+		/* Login PDU */
+		fuzz_iscsi_send_login_request(dev_ctx, SESSION_TYPE_NORMAL);
+	} else if (conn->full_feature == 1) {
+		dev_submit_requests(dev_ctx);
+	}
+
+	spdk_sock_flush(conn->sock);
+
+	fuzz_iscsi_handle_incoming_pdus(conn);
+
+	return 0;
+}
+
+static void
+start_io(void *ctx)
+{
+	struct fuzz_iscsi_dev_ctx *dev_ctx = ctx;
+
+	dev_ctx->sess.ExpCmdSN = 0;
+	dev_ctx->sess.MaxCmdSN = 64;
+	dev_ctx->sess.MaxBurstLength = SPDK_ISCSI_MAX_RECV_DATA_SEGMENT_LENGTH;
+	dev_ctx->sess.MaxOutstandingR2T = 1;
+	dev_ctx->sess.tag = 1;
+	dev_ctx->sess.tsih = 256;
+
+	dev_ctx->conn = calloc(1, sizeof(*dev_ctx->conn));
+	assert(dev_ctx->conn != NULL);
+	TAILQ_INIT(&dev_ctx->conn->write_pdu_list);
+
+	iscsi_fuzz_conn_reset(dev_ctx->conn, &dev_ctx->sess);
+	iscsi_fuzz_sock_connect(dev_ctx->conn);
+	usleep(1000);
+
+	/* Login PDU */
+	fuzz_iscsi_send_login_request(dev_ctx, SESSION_TYPE_NORMAL);
+
+	if (g_random_seed) {
+		dev_ctx->random_seed = g_random_seed;
+	} else {
+		dev_ctx->random_seed = spdk_get_ticks();
+	}
+
+	dev_ctx->poller = SPDK_POLLER_REGISTER(poll_dev, dev_ctx, 0);
+	if (dev_ctx->poller == NULL) {
+		return;
+	}
+}
+
+static int
+check_app_completion(void *ctx)
+{
+	if (g_num_active_threads == 0) {
+		spdk_poller_unregister(&g_app_completion_poller);
+		printf("Fuzzing completed. Shutting down the fuzz application.\n\n");
+		cleanup();
+		spdk_app_stop(0);
+	}
+	return 0;
+}
+
+static void
+begin_iscsi_fuzz(void *ctx)
+{
+	struct fuzz_iscsi_dev_ctx *dev_ctx;
+	int rc;
+
+	g_runtime_ticks = spdk_get_ticks() + g_runtime * spdk_get_ticks_hz();
+
+	g_valid_buffer = spdk_malloc(0x1000, 0x200, NULL, SPDK_ENV_LCORE_ID_ANY, SPDK_MALLOC_SHARE);
+	if (g_valid_buffer == NULL) {
+		fprintf(stderr, "Failed to allocate a valid buffer for random PDUs\n");
+		goto out;
+	}
+
+	rc = fuzz_iscsi_dev_init();
+	if (rc) {
+		fprintf(stderr, "fuzz_iscsi_dev_init() failed.\n");
+		goto out;
+	}
+
+	TAILQ_FOREACH(dev_ctx, &g_dev_list, link) {
+		assert(dev_ctx->thread != NULL);
+		spdk_thread_send_msg(dev_ctx->thread, start_io, dev_ctx);
+		__sync_add_and_fetch(&g_num_active_threads, 1);
+	}
+
+	g_app_completion_poller = SPDK_POLLER_REGISTER(check_app_completion, NULL, 1000000);
+	if (g_app_completion_poller == NULL) {
+		fprintf(stderr, "Failed to register a poller for test completion checking.\n");
+		goto out;
+	}
+
+	return;
+out:
+	cleanup();
+	spdk_app_stop(0);
+}
+
+static void
+iscsi_fuzz_usage(void)
+{
+	fprintf(stderr, " -T <path>                 iSCSI Target IP address.\n");
+	fprintf(stderr, " -S <integer>              Seed value for test.\n");
+	fprintf(stderr,
+		" -t <integer>              Time in seconds to run the fuzz test. Only valid if -j is not specified.\n");
+}
+
+static int
+iscsi_fuzz_parse(int ch, char *arg)
+{
+	int64_t error_test;
+
+	switch (ch) {
+	case 'T':
+		g_tgt_ip = optarg;
+		break;
+	case 'S':
+		error_test = spdk_strtol(arg, 10);
+		if (error_test < 0) {
+			fprintf(stderr, "Invalid value supplied for the random seed.\n");
+			return -1;
+		} else {
+			g_random_seed = error_test;
+		}
+		break;
+	case 't':
+		g_runtime = spdk_strtol(optarg, 10);
+		if (g_runtime <= 0 || g_runtime > MAX_RUNTIME_S) {
+			fprintf(stderr, "You must supply a positive runtime value less than %d.\n", MAX_RUNTIME_S);
+			return -1;
+		}
+		break;
+	case '?':
+	default:
+		iscsi_fuzz_usage();
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+int
+main(int argc, char **argv)
+{
+	struct spdk_app_opts opts = {};
+	int rc;
+
+	g_runtime = DEFAULT_RUNTIME;
+	srand((unsigned)time(0));
+
+	TAILQ_INIT(&g_get_pdu_list);
+
+	spdk_app_opts_init(&opts);
+	opts.name = "iscsi_fuzz";
+
+	if ((rc = spdk_app_parse_args(argc, argv, &opts, "T:S:t:", NULL, iscsi_fuzz_parse,
+				      iscsi_fuzz_usage) != SPDK_APP_PARSE_ARGS_SUCCESS)) {
+		return rc;
+	}
+
+	rc = spdk_app_start(&opts, begin_iscsi_fuzz, NULL);
+
+	return rc;
+}