sg_rmsn.c

/*
 * Copyright (c) 2005 Douglas Gilbert.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <getopt.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "sg_include.h"
#include "sg_lib.h"
#include "sg_cmds.h"

/* A utility program for the Linux OS SCSI subsystem.
 *
 *
 * This program issues the SCSI command READ MEDIA SERIAL NUMBER
 * to the given SCSI device.
 */

static char * version_str = "1.00 20050329";

#define ME "sg_rmsn: "

#define SERIAL_NUM_SANITY_LEN (16 * 1024)


static struct option long_options[] = {
        {"help", 0, 0, 'h'},
        {"raw", 0, 0, 'r'},
        {"verbose", 0, 0, 'v'},
        {"version", 0, 0, 'V'},
        {0, 0, 0, 0},
};

static void usage()
{
    fprintf(stderr, "Usage: "
          "sg_rmsn   [--help] [--verbose] [--version] <scsi_device>\n"
          "  where: --help|-h          print out usage message\n"
          "         --raw|-r           output serial number to stdout\n"
          "         --verbose|-v       increase verbosity\n"
          "         --version|-V       print version string and exit\n"
          "Sends SCSI READ MEDIA SERIAL NUMBER command\n"
          );

}

int main(int argc, char * argv[])
{
    int sg_fd, res, c, sn_len;
    unsigned char rmsn_buff[4];
    unsigned char * ucp = NULL;
    int raw = 0;
    int verbose = 0;
    char device_name[512];
    int ret = 1;

    memset(device_name, 0, sizeof device_name);
    while (1) {
        int option_index = 0;

        c = getopt_long(argc, argv, "hrvV", long_options,
                        &option_index);
        if (c == -1)
            break;

        switch (c) {
        case 'h':
        case '?':
            usage();
            return 0;
        case 'r':
            raw = 1;
            break;
        case 'v':
            ++verbose;
            break;
        case 'V':
            fprintf(stderr, ME "version: %s\n", version_str);
            return 0;
        default:
            fprintf(stderr, "unrecognised switch code 0x%x ??\n", c);
            usage();
            return 1;
        }
    }
    if (optind < argc) {
        if ('\0' == device_name[0]) {
            strncpy(device_name, argv[optind], sizeof(device_name) - 1);
            device_name[sizeof(device_name) - 1] = '\0';
            ++optind;
        }
        if (optind < argc) {
            for (; optind < argc; ++optind)
                fprintf(stderr, "Unexpected extra argument: %s\n",
                        argv[optind]);
            usage();
            return 1;
        }
    }

    if (0 == device_name[0]) {
        fprintf(stderr, "missing device name!\n");
        usage();
        return 1;
    }
    sg_fd = open(device_name, O_RDWR | O_NONBLOCK);
    if (sg_fd < 0) {
        fprintf(stderr, ME "open error: %s: ", device_name);
        perror("");
        return 1;
    }

    memset(rmsn_buff, 0x0, sizeof(rmsn_buff));

    res = sg_ll_read_media_serial_num(sg_fd, rmsn_buff, sizeof(rmsn_buff),
				      1, verbose);
    if (0 == res) {
        sn_len = (rmsn_buff[0] << 24) + (rmsn_buff[1] << 16) + 
                     (rmsn_buff[2] << 8) + rmsn_buff[3] + 4;
	if (! raw)
            printf("Reported serial number length = %d\n", sn_len);
	if (0 == sn_len) {
	    fprintf(stderr, "    This implies the media has no serial "
		    "number\n");
	    goto err_out;
	}
	if (sn_len > SERIAL_NUM_SANITY_LEN) {
            fprintf(stderr, "    That length (%d) seems too long for a "
		    "serial number\n", sn_len);
	    goto err_out;
	}
	sn_len += 4;
	ucp = malloc(sn_len);
	if (NULL == ucp) {
            fprintf(stderr, "    Out of memory (ram)\n");
	    goto err_out;
	}
        res = sg_ll_read_media_serial_num(sg_fd, ucp, sn_len, 1, verbose);
	if (0 == res) {
            sn_len = (ucp[0] << 24) + (ucp[1] << 16) + (ucp[2] << 8) +
                     ucp[3] + 4;
	    if (raw) {
		if (sn_len > 0)
		    fwrite(ucp + 4, 1, sn_len, stdout);
	    } else {
                printf("Serial number:\n");
	        if (sn_len > 0)
                    dStrHex((const char *)ucp + 4, sn_len, 0); 
	        ret = 0;
	    }
	} else if (SG_LIB_CAT_INVALID_OP == res)
            fprintf(stderr, "Read Media Serial Number command not "
		    "supported (b)\n");
        else if (SG_LIB_CAT_ILLEGAL_REQ == res)
            fprintf(stderr, "bad field in Read Media Serial Number cdb "
		    "(b)\n");
    } else if (SG_LIB_CAT_INVALID_OP == res)
        fprintf(stderr, "Read Media Serial Number command not supported\n");
    else if (SG_LIB_CAT_ILLEGAL_REQ == res)
        fprintf(stderr, "bad field in Read Media Serial Number cdb\n");

err_out:
    if (ucp)
	free(ucp);
    res = close(sg_fd);
    if (res < 0) {
        perror(ME "close error");
        return 1;
    }
    return ret;
}