warren/libiscsi
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
2a5a0b3291c618eebccb51a129d7b3a2a7104616
libiscsi/examples/iscsiclient.c
Bart Van Assche 2a5a0b3291 Enable -Wno-unused-parameter 
Instead of adding __attribute__((unused)) to unused arguments, add the
-Wno-unused-parameter compiler flag.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
2021-05-23 13:23:41 -07:00

685 lines
20 KiB
C
Raw Blame History

/*
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/>.
*/
/* This is an example of using libiscsi.
* It basically logs in to the the target and performs a discovery.
* It then selects the last target in the returned list and
* starts a normal login to that target.
* Once logged in it issues a REPORTLUNS call and selects the last returned lun in the list.
* This LUN is then used to send INQUIRY, READCAPACITY10 and READ10 test calls to.
*/
/* The reason why we have to specify an allocation length and sometimes probe, starting with a small value, probing how big the buffer
* should be, and asking again with a bigger buffer.
* Why not just always ask with a buffer that is big enough?
* The reason is that a lot of scsi targets are "sensitive" and ""buggy""
* many targets will just fail the operation completely if they thing alloc len is unreasonably big.
*/
/* This is the host/port we connect to.*/
#define TARGET "127.0.0.1:3260"
#if defined(_WIN32)
#include <winsock2.h>
#include "win32/win32_compat.h"
#pragma comment(lib, "ws2_32.lib")
WSADATA wsaData;
#else
#include <poll.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include "iscsi.h"
#include "scsi-lowlevel.h"
struct client_state {
int finished;
const char *message;
int has_discovered_target;
char *target_name;
char *target_address;
int lun;
int block_size;
};
unsigned char small_buffer[512];
void tm_at_cb(struct iscsi_context *iscsi, int status, void *command_data, void *private_data)
{
struct client_state *clnt = (struct client_state *)private_data;
printf("tm at cb !\n");
printf("response : %d\n", *((uint32_t *)command_data));
clnt->finished = 1;
}
void synccache10_cb(struct iscsi_context *iscsi, int status, void *command_data, void *private_data)
{
printf("SYNCCACHE10 status:%d\n", status);
}
void nop_out_cb(struct iscsi_context *iscsi, int status, void *command_data, void *private_data)
{
struct iscsi_data *data = command_data;
struct scsi_task *task;
printf("NOP-IN status:%d\n", status);
if (data->size > 0) {
printf("NOP-IN (%zu) data:%.*s\n",
data->size, (int)data->size, data->data);
}
printf("Send SYNCHRONIZECACHE10\n");
task = iscsi_synchronizecache10_task(iscsi, 2, 0, 0, 0, 0, synccache10_cb, private_data);
if (task == NULL) {
printf("failed to send sync cache10\n");
exit(10);
}
printf("send task management to try to abort the sync10 task\n");
if (iscsi_task_mgmt_abort_task_async(iscsi, task, tm_at_cb, private_data) != 0) {
printf("failed to send task management to abort the sync10 task\n");
exit(10);
}
}
void write10_1_cb(struct iscsi_context *iscsi, int status, void *command_data, void *private_data)
{
struct scsi_task *task = command_data;
if (status == SCSI_STATUS_CHECK_CONDITION) {
printf("Write10 failed with sense key:%d ascq:%04x\n", task->sense.key, task->sense.ascq);
scsi_free_scsi_task(task);
exit(10);
}
if (status != SCSI_STATUS_GOOD) {
printf("Write10 failed with %s\n", iscsi_get_error(iscsi));
scsi_free_scsi_task(task);
exit(10);
}
printf("Write successful :%d\n", status);
scsi_free_scsi_task(task);
exit(10);
}
void write10_cb(struct iscsi_context *iscsi, int status, void *command_data, void *private_data)
{
struct client_state *clnt = (struct client_state *)private_data;
struct scsi_task *task = command_data;
int i;
static unsigned char wb[512];
static struct scsi_iovec iov[3];
if (status == SCSI_STATUS_CHECK_CONDITION) {
printf("Write10 failed with sense key:%d ascq:%04x\n", task->sense.key, task->sense.ascq);
scsi_free_scsi_task(task);
exit(10);
}
if (status != SCSI_STATUS_GOOD) {
printf("Write10 failed with %s\n", iscsi_get_error(iscsi));
scsi_free_scsi_task(task);
exit(10);
}
printf("Write successful :%d\n", status);
scsi_free_scsi_task(task);
printf("write the block using an iovector\n");
for (i = 0;i < 512; i++) {
wb[i] = (511 - i) & 0xff;
}
task = iscsi_write10_task(iscsi, clnt->lun, 0, NULL, 512, 512,
0, 0, 0, 0, 0,
write10_1_cb, private_data);
if (task == NULL) {
printf("failed to send write10 command\n");
exit(10);
}
/* provide iovectors where to read the data.
*/
iov[0].iov_base = &wb[0];
iov[0].iov_len = 4;
iov[1].iov_base = &wb[4];
iov[1].iov_len = 11;
iov[2].iov_base = &wb[15];
iov[2].iov_len = 512 - 15;
scsi_task_set_iov_out(task, &iov[0], 3);
}
void read10_1_cb(struct iscsi_context *iscsi, int status, void *command_data, void *private_data)
{
struct client_state *clnt = (struct client_state *)private_data;
struct scsi_task *task = command_data;
int i;
static unsigned char wb[512];
if (status == SCSI_STATUS_CHECK_CONDITION) {
printf("Read10 failed with sense key:%d ascq:%04x\n", task->sense.key, task->sense.ascq);
scsi_free_scsi_task(task);
exit(10);
}
printf("READ10 using scsi_task_set_iov_in() successful. Block content:\n");
for (i=0;i<512;i++) {
printf("%02x ", small_buffer[i]);
if (i%16==15)
printf("\n");
if (i==69)
break;
}
printf("...\n");
scsi_free_scsi_task(task);
#if 0
printf("Finished, wont try to write data since that will likely destroy your LUN :-(\n");
printf("Send NOP-OUT\n");
if (iscsi_nop_out_async(iscsi, nop_out_cb, (unsigned char *)"Ping!", 6, private_data) != 0) {
printf("failed to send nop-out\n");
scsi_free_scsi_task(task);
exit(10);
}
#else
printf("write the block normally\n");
for (i = 0;i < 512; i++) {
wb[i] = i & 0xff;
}
task = iscsi_write10_task(iscsi, clnt->lun, 0, wb, 512, 512,
0, 0, 0, 0, 0,
write10_cb, private_data);
if (task == NULL) {
printf("failed to send write10 command\n");
exit(10);
}
#endif
}
void read10_cb(struct iscsi_context *iscsi, int status, void *command_data, void *private_data)
{
struct client_state *clnt = (struct client_state *)private_data;
struct scsi_task *task = command_data;
int i;
static struct scsi_iovec iov[3];
if (status == SCSI_STATUS_CHECK_CONDITION) {
printf("Read10 failed with sense key:%d ascq:%04x\n", task->sense.key, task->sense.ascq);
scsi_free_scsi_task(task);
exit(10);
}
printf("READ10 using scsi_task_add_data_in_buffer() successful. Block content:\n");
for (i=0;i<512;i++) {
printf("%02x ", small_buffer[i]);
if (i%16==15)
printf("\n");
if (i==69)
break;
}
printf("...\n");
scsi_free_scsi_task(task);
memset(&small_buffer[0], 0, 512);
if ((task = iscsi_read10_task(iscsi, clnt->lun, 0, clnt->block_size, clnt->block_size, 0, 0, 0, 0, 0, read10_1_cb, private_data)) == NULL) {
printf("failed to send read10 command\n");
exit(10);
}
/* provide iovectors where to read the data.
*/
iov[0].iov_base = &small_buffer[0];
iov[0].iov_len = 7;
iov[1].iov_base = &small_buffer[7];
iov[1].iov_len = 8;
iov[2].iov_base = &small_buffer[15];
iov[2].iov_len = 512 - 15;
scsi_task_set_iov_in(task, &iov[0], 3);
}
void read6_cb(struct iscsi_context *iscsi, int status, void *command_data, void *private_data)
{
struct client_state *clnt = (struct client_state *)private_data;
struct scsi_task *task = command_data;
int i;
if (status == SCSI_STATUS_CHECK_CONDITION) {
printf("Read6 failed with sense key:%d ascq:%04x\n", task->sense.key, task->sense.ascq);
scsi_free_scsi_task(task);
exit(10);
}
printf("READ6 successful. Block content:\n");
for (i=0;i<task->datain.size;i++) {
printf("%02x ", task->datain.data[i]);
if (i%16==15)
printf("\n");
if (i==69)
break;
}
printf("...\n");
scsi_free_scsi_task(task);
if ((task = iscsi_read10_task(iscsi, clnt->lun, 0, clnt->block_size, clnt->block_size, 0, 0, 0, 0, 0, read10_cb, private_data)) == NULL) {
printf("failed to send read10 command\n");
exit(10);
}
/* provide a buffer from the application to read into instead
* of copying and linearizing the data. This saves two copies
* of the data. One in libiscsi and one in the application
* callback.
*/
scsi_task_add_data_in_buffer(task, 7, &small_buffer[0]);
scsi_task_add_data_in_buffer(task, 8, &small_buffer[7]);
scsi_task_add_data_in_buffer(task, 512-15, &small_buffer[15]);
}
void readcapacity10_cb(struct iscsi_context *iscsi, int status, void *command_data, void *private_data)
{
struct client_state *clnt = (struct client_state *)private_data;
struct scsi_task *task = command_data;
struct scsi_readcapacity10 *rc10;
int full_size;
if (status == SCSI_STATUS_CHECK_CONDITION) {
printf("Readcapacity10 failed with sense key:%d ascq:%04x\n", task->sense.key, task->sense.ascq);
scsi_free_scsi_task(task);
exit(10);
}
full_size = scsi_datain_getfullsize(task);
if (full_size < task->datain.size) {
printf("not enough data for full size readcapacity10\n");
scsi_free_scsi_task(task);
exit(10);
}
rc10 = scsi_datain_unmarshall(task);
if (rc10 == NULL) {
printf("failed to unmarshall readcapacity10 data\n");
scsi_free_scsi_task(task);
exit(10);
}
clnt->block_size = rc10->block_size;
printf("READCAPACITY10 successful. Size:%d blocks blocksize:%d. Read first block\n", rc10->lba, rc10->block_size);
if (iscsi_read6_task(iscsi, clnt->lun, 0, clnt->block_size, clnt->block_size, read6_cb, private_data) == NULL) {
printf("failed to send read6 command\n");
scsi_free_scsi_task(task);
exit(10);
}
scsi_free_scsi_task(task);
}
void modesense6_cb(struct iscsi_context *iscsi, int status, void *command_data, void *private_data)
{
struct client_state *clnt = (struct client_state *)private_data;
struct scsi_task *task = command_data;
struct scsi_mode_sense *ms;
int full_size;
if (status == SCSI_STATUS_CHECK_CONDITION) {
printf("Modesense6 failed with sense key:%d ascq:%04x\n", task->sense.key, task->sense.ascq);
exit(10);
} else {
full_size = scsi_datain_getfullsize(task);
if (full_size > task->datain.size) {
printf("did not get enough data for mode sense, sening modesense again asking for bigger buffer\n");
if (iscsi_modesense6_task(iscsi, clnt->lun, 0, SCSI_MODESENSE_PC_CURRENT, SCSI_MODEPAGE_RETURN_ALL_PAGES, 0, full_size, modesense6_cb, private_data) == NULL) {
printf("failed to send modesense6 command\n");
scsi_free_scsi_task(task);
exit(10);
}
scsi_free_scsi_task(task);
return;
}
}
printf("MODESENSE6 successful.\n");
ms = scsi_datain_unmarshall(task);
if (ms == NULL) {
printf("failed to unmarshall mode sense datain blob\n");
scsi_free_scsi_task(task);
exit(10);
}
printf("Send READCAPACITY10\n");
if (iscsi_readcapacity10_task(iscsi, clnt->lun, 0, 0, readcapacity10_cb, private_data) == NULL) {
printf("failed to send readcapacity command\n");
scsi_free_scsi_task(task);
exit(10);
}
scsi_free_scsi_task(task);
}
void inquiry_cb(struct iscsi_context *iscsi, int status, void *command_data, void *private_data)
{
struct client_state *clnt = (struct client_state *)private_data;
struct scsi_task *task = command_data;
struct scsi_inquiry_standard *inq;
if (status == SCSI_STATUS_CHECK_CONDITION) {
printf("Inquiry failed with sense key:%d ascq:%04x\n", task->sense.key, task->sense.ascq);
scsi_free_scsi_task(task);
exit(10);
}
printf("INQUIRY successful for standard data.\n");
inq = scsi_datain_unmarshall(task);
if (inq == NULL) {
printf("failed to unmarshall inquiry datain blob\n");
scsi_free_scsi_task(task);
exit(10);
}
printf("Device Type is %d. VendorId:%s ProductId:%s\n", inq->device_type, inq->vendor_identification, inq->product_identification);
printf("Send MODESENSE6\n");
if (iscsi_modesense6_task(iscsi, clnt->lun, 0, SCSI_MODESENSE_PC_CURRENT, SCSI_MODEPAGE_RETURN_ALL_PAGES, 0, 4, modesense6_cb, private_data) == NULL) {
printf("failed to send modesense6 command\n");
scsi_free_scsi_task(task);
exit(10);
}
scsi_free_scsi_task(task);
}
void testunitready_cb(struct iscsi_context *iscsi, int status, void *command_data, void *private_data)
{
struct client_state *clnt = (struct client_state *)private_data;
struct scsi_task *task = command_data;
if (status == SCSI_STATUS_CHECK_CONDITION) {
printf("First testunitready failed with sense key:%d ascq:%04x\n", task->sense.key, task->sense.ascq);
if (task->sense.key == SCSI_SENSE_UNIT_ATTENTION && task->sense.ascq == SCSI_SENSE_ASCQ_BUS_RESET) {
printf("target device just came online, try again\n");
if (iscsi_testunitready_task(iscsi, clnt->lun, testunitready_cb, private_data) == NULL) {
printf("failed to send testunitready command\n");
scsi_free_scsi_task(task);
exit(10);
}
}
scsi_free_scsi_task(task);
return;
}
printf("TESTUNITREADY successful, do an inquiry on lun:%d\n", clnt->lun);
if (iscsi_inquiry_task(iscsi, clnt->lun, 0, 0, 64, inquiry_cb, private_data) == NULL) {
printf("failed to send inquiry command : %s\n", iscsi_get_error(iscsi));
scsi_free_scsi_task(task);
exit(10);
}
scsi_free_scsi_task(task);
}
void reportluns_cb(struct iscsi_context *iscsi, int status, void *command_data, void *private_data)
{
struct client_state *clnt = (struct client_state *)private_data;
struct scsi_task *task = command_data;
struct scsi_reportluns_list *list;
int full_report_size;
int i;
if (status != SCSI_STATUS_GOOD) {
printf("Reportluns failed with : %s\n", iscsi_get_error(iscsi));
scsi_free_scsi_task(task);
return;
}
full_report_size = scsi_datain_getfullsize(task);
printf("REPORTLUNS status:%d data size:%d, full reports luns data size:%d\n", status, task->datain.size, full_report_size);
if (full_report_size > task->datain.size) {
printf("We did not get all the data we need in reportluns, ask again\n");
if (iscsi_reportluns_task(iscsi, 0, full_report_size, reportluns_cb, private_data) == NULL) {
printf("failed to send reportluns command\n");
scsi_free_scsi_task(task);
exit(10);
}
scsi_free_scsi_task(task);
return;
}
list = scsi_datain_unmarshall(task);
if (list == NULL) {
printf("failed to unmarshall reportluns datain blob\n");
scsi_free_scsi_task(task);
exit(10);
}
for (i=0; i < (int)list->num; i++) {
printf("LUN:%d found\n", list->luns[i]);
clnt->lun = list->luns[i];
}
printf("Will use LUN:%d\n", clnt->lun);
printf("Send testunitready to lun %d\n", clnt->lun);
if (iscsi_testunitready_task(iscsi, clnt->lun, testunitready_cb, private_data) == NULL) {
printf("failed to send testunitready command : %s\n", iscsi_get_error(iscsi));
scsi_free_scsi_task(task);
exit(10);
}
scsi_free_scsi_task(task);
}
void normallogin_cb(struct iscsi_context *iscsi, int status, void *command_data, void *private_data)
{
if (status != 0) {
printf("Failed to log in to target : %s\n", iscsi_get_error(iscsi));
exit(10);
}
printf("Logged in normal session, send reportluns\n");
if (iscsi_reportluns_task(iscsi, 0, 16, reportluns_cb, private_data) == NULL) {
printf("failed to send reportluns command : %s\n", iscsi_get_error(iscsi));
exit(10);
}
}
void normalconnect_cb(struct iscsi_context *iscsi, int status, void *command_data, void *private_data)
{
printf("Connected to iscsi socket\n");
if (status != 0) {
printf("normalconnect_cb: connection failed status:%d\n", status);
exit(10);
}
printf("connected, send login command\n");
iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL);
iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_CRC32C_NONE);
if (iscsi_login_async(iscsi, normallogin_cb, private_data) != 0) {
printf("iscsi_login_async failed\n");
exit(10);
}
}
void discoverylogout_cb(struct iscsi_context *iscsi, int status, void *command_data, void *private_data)
{
struct client_state *clnt = (struct client_state *)private_data;
printf("discovery session logged out, Message from main() was:[%s]\n", clnt->message);
if (status != 0) {
printf("Failed to logout from target. : %s\n", iscsi_get_error(iscsi));
exit(10);
}
printf("disconnect socket\n");
if (iscsi_disconnect(iscsi) != 0) {
printf("Failed to disconnect old socket\n");
exit(10);
}
printf("reconnect with normal login to [%s]\n", clnt->target_address);
printf("Use targetname [%s] when connecting\n", clnt->target_name);
if (iscsi_set_targetname(iscsi, clnt->target_name)) {
printf("Failed to set target name\n");
exit(10);
}
if (iscsi_set_alias(iscsi, "ronnie") != 0) {
printf("Failed to add alias\n");
exit(10);
}
if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) {
printf("Failed to set settion type to normal\n");
exit(10);
}
if (iscsi_connect_async(iscsi, clnt->target_address, normalconnect_cb, clnt) != 0) {
printf("iscsi_connect failed : %s\n", iscsi_get_error(iscsi));
exit(10);
}
}
void discovery_cb(struct iscsi_context *iscsi, int status, void *command_data, void *private_data)
{
struct client_state *clnt = (struct client_state *)private_data;
struct iscsi_discovery_address *addr;
printf("discovery callback status:%04x\n", status);
if (status != 0 || command_data == NULL) {
printf("Failed to do discovery on target. : %s\n", iscsi_get_error(iscsi));
exit(10);
}
for(addr = command_data; addr; addr = addr->next) {
printf("Target:%s Address:%s\n", addr->target_name, addr->portals->portal);
}
addr=command_data;
clnt->has_discovered_target = 1;
clnt->target_name = strdup(addr->target_name);
clnt->target_address = strdup(addr->portals->portal);
printf("discovery complete, send logout command\n");
if (iscsi_logout_async(iscsi, discoverylogout_cb, private_data) != 0) {
printf("iscsi_logout_async failed : %s\n", iscsi_get_error(iscsi));
exit(10);
}
}
void discoverylogin_cb(struct iscsi_context *iscsi, int status, void *command_data, void *private_data)
{
if (status != 0) {
printf("Failed to log in to target. : %s\n", iscsi_get_error(iscsi));
exit(10);
}
printf("Logged in to target, send discovery command\n");
if (iscsi_discovery_async(iscsi, discovery_cb, private_data) != 0) {
printf("failed to send discovery command : %s\n", iscsi_get_error(iscsi));
exit(10);
}
}
void discoveryconnect_cb(struct iscsi_context *iscsi, int status, void *command_data, void *private_data)
{
printf("Connected to iscsi socket status:0x%08x\n", status);
if (status != 0) {
printf("discoveryconnect_cb: connection failed : %s\n", iscsi_get_error(iscsi));
exit(10);
}
printf("connected, send login command\n");
iscsi_set_session_type(iscsi, ISCSI_SESSION_DISCOVERY);
if (iscsi_login_async(iscsi, discoverylogin_cb, private_data) != 0) {
printf("iscsi_login_async failed : %s\n", iscsi_get_error(iscsi));
exit(10);
}
}
int main(int argc, char *argv[])
{
struct iscsi_context *iscsi;
struct pollfd pfd;
struct client_state clnt;
printf("iscsi client\n");
#if defined(_WIN32)
if (WSAStartup(MAKEWORD(2,2), &wsaData) != 0) {
printf("Failed to start Winsock2\n");
exit(10);
}
#endif
memset(&clnt, 0, sizeof(clnt));
iscsi = iscsi_create_context("iqn.2002-10.com.ronnie:client");
if (iscsi == NULL) {
printf("Failed to create context\n");
exit(10);
}
if (iscsi_set_alias(iscsi, "ronnie") != 0) {
printf("Failed to add alias\n");
exit(10);
}
clnt.message = "Hello iSCSI";
clnt.has_discovered_target = 0;
if (iscsi_connect_async(iscsi, TARGET, discoveryconnect_cb, &clnt) != 0) {
printf("iscsi_connect failed. %s\n", iscsi_get_error(iscsi));
exit(10);
}
while (clnt.finished == 0) {
pfd.fd = iscsi_get_fd(iscsi);
pfd.events = iscsi_which_events(iscsi);
if (poll(&pfd, 1, -1) < 0) {
printf("Poll failed");
exit(10);
}
if (iscsi_service(iscsi, pfd.revents) < 0) {
printf("iscsi_service failed with : %s\n", iscsi_get_error(iscsi));
break;
}
}
iscsi_destroy_context(iscsi);
if (clnt.target_name != NULL) {
free(clnt.target_name);
}
if (clnt.target_address != NULL) {
free(clnt.target_address);
}
printf("ok\n");
return 0;
}
Reference in New Issue View Git Blame Copy Permalink