Add utility to get/set the software write protect flag
This commit is contained in:
Ronnie Sahlberg
251
src/iscsi-swp.c
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251
src/iscsi-swp.c
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/*
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Copyright (C) 2013 by Ronnie Sahlberg <ronniesahlberg@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef HAVE_POLL_H
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#include <poll.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <getopt.h>
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#include "iscsi.h"
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#include "scsi-lowlevel.h"
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#ifndef discard_const
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#define discard_const(ptr) ((void *)((intptr_t)(ptr)))
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#endif
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const char *initiator = "iqn.2007-10.com.github:sahlberg:libiscsi:iscsi-swp";
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void print_usage(void)
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{
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fprintf(stderr, "Usage: iscsi-swp [-?] [-?|--help] [--usage] [-i|--initiator-name=iqn-name]\n"
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"\t\t[-s|--swp {on|off}] <iscsi-url>\n");
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}
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void print_help(void)
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{
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fprintf(stderr, "Usage: iscsi-swp [OPTION...] <iscsi-url>\n");
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fprintf(stderr, " -i, --initiator-name=iqn-name Initiatorname to use\n");
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fprintf(stderr, " -s, --swp={on|off} Turn software write protect on/off\n");
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fprintf(stderr, " -d, --debug=integer debug level (0=disabled)\n");
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fprintf(stderr, "\n");
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fprintf(stderr, "Help options:\n");
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fprintf(stderr, " -?, --help Show this help message\n");
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fprintf(stderr, " --usage Display brief usage message\n");
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fprintf(stderr, "\n");
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fprintf(stderr, "iSCSI URL format : %s\n", ISCSI_URL_SYNTAX);
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fprintf(stderr, "\n");
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fprintf(stderr, "<host> is either of:\n");
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fprintf(stderr, " \"hostname\" iscsi.example\n");
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fprintf(stderr, " \"ipv4-address\" 10.1.1.27\n");
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fprintf(stderr, " \"ipv6-address\" [fce0::1]\n");
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}
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int main(int argc, char *argv[])
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{
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struct iscsi_context *iscsi;
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const char *url = NULL;
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struct iscsi_url *iscsi_url = NULL;
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int show_help = 0, show_usage = 0, debug = 0;
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int c;
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int ret = 0;
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int swp = 0;
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struct scsi_task *sense_task = NULL;
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struct scsi_task *select_task = NULL;
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struct scsi_mode_sense *ms;
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struct scsi_mode_page *mp;
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static struct option long_options[] = {
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{"help", no_argument, NULL, 'h'},
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{"usage", no_argument, NULL, 'u'},
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{"debug", no_argument, NULL, 'd'},
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{"initiator_name", required_argument, NULL, 'i'},
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{"swp", required_argument, NULL, 's'},
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{0, 0, 0, 0}
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};
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int option_index;
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while ((c = getopt_long(argc, argv, "h?udi:s:", long_options,
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&option_index)) != -1) {
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switch (c) {
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case 'h':
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case '?':
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show_help = 1;
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break;
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case 'u':
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show_usage = 1;
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break;
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case 'd':
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debug = 1;
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break;
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case 'i':
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initiator = optarg;
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break;
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case 's':
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if (!strcmp(optarg, "on") || !strcmp(optarg, "ON")) {
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swp = 1;
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}
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if (!strcmp(optarg, "off") || !strcmp(optarg, "OFF")) {
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swp = 2;
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}
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break;
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default:
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fprintf(stderr, "Unrecognized option '%c'\n\n", c);
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print_help();
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exit(0);
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}
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}
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if (show_help != 0) {
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print_help();
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exit(0);
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}
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if (show_usage != 0) {
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print_usage();
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exit(0);
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}
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iscsi = iscsi_create_context(initiator);
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if (iscsi == NULL) {
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fprintf(stderr, "Failed to create context\n");
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exit(10);
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}
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if (debug > 0) {
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iscsi_set_log_level(iscsi, debug);
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iscsi_set_log_fn(iscsi, iscsi_log_to_stderr);
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}
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url = strdup(argv[optind]);
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if (url == NULL) {
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fprintf(stderr, "You must specify the URL\n");
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print_usage();
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ret = 10;
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goto finished;
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}
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iscsi_url = iscsi_parse_full_url(iscsi, url);
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free(discard_const(url));
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if (iscsi_url == NULL) {
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fprintf(stderr, "Failed to parse URL: %s\n",
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iscsi_get_error(iscsi));
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ret = 10;
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goto finished;
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}
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iscsi_set_targetname(iscsi, iscsi_url->target);
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iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL);
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iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
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if (iscsi_url->user != NULL) {
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if (iscsi_set_initiator_username_pwd(iscsi, iscsi_url->user, iscsi_url->passwd) != 0) {
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fprintf(stderr, "Failed to set initiator username and password\n");
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ret = 10;
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goto finished;
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}
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}
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if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) {
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fprintf(stderr, "Login Failed. %s\n", iscsi_get_error(iscsi));
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ret = 10;
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goto finished;
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}
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sense_task = iscsi_modesense6_sync(iscsi, iscsi_url->lun,
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0, SCSI_MODESENSE_PC_CURRENT,
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SCSI_MODESENSE_PAGECODE_CONTROL,
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0, 255);
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if (sense_task == NULL) {
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printf("Failed to send MODE_SENSE6 command: %s\n",
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iscsi_get_error(iscsi));
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ret = 10;
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goto finished;
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}
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if (sense_task->status != SCSI_STATUS_GOOD) {
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printf("MODE_SENSE6 failed: %s\n",
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iscsi_get_error(iscsi));
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ret = 10;
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goto finished;
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}
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ms = scsi_datain_unmarshall(sense_task);
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if (ms == NULL) {
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printf("failed to unmarshall mode sense datain blob\n");
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ret = 10;
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goto finished;
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}
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mp = scsi_modesense_get_page(ms, SCSI_MODESENSE_PAGECODE_CONTROL, 0);
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if (mp == NULL) {
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printf("failed to read control mode page\n");
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ret = 10;
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goto finished;
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}
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printf("SWP:%d\n", mp->control.swp);
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switch (swp) {
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case 1:
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mp->control.swp = 1;
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break;
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case 2:
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mp->control.swp = 0;
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break;
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default:
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goto finished;
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}
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printf("Turning SWP %s\n", (swp == 1) ? "ON" : "OFF");
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select_task = iscsi_modeselect6_sync(iscsi, iscsi_url->lun,
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1, 0, mp);
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if (select_task == NULL) {
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printf("Failed to send MODE_SELECT6 command: %s\n",
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iscsi_get_error(iscsi));
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ret = 10;
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goto finished;
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}
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if (select_task->status != SCSI_STATUS_GOOD) {
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printf("MODE_SELECT6 failed: %s\n",
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iscsi_get_error(iscsi));
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ret = 10;
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goto finished;
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}
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finished:
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if (sense_task != NULL) {
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scsi_free_scsi_task(sense_task);
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}
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if (select_task != NULL) {
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scsi_free_scsi_task(select_task);
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}
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if (iscsi_url != NULL) {
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iscsi_destroy_url(iscsi_url);
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}
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iscsi_logout_sync(iscsi);
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iscsi_destroy_context(iscsi);
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return ret;
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}
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