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scsi_info.c

/*======================================================================

    Utility to look up information about SCSI devices

    scsi_info.c 1.20 2003/08/30 20:58:06

    The contents of this file are subject to the Mozilla Public
    License Version 1.1 (the "License"); you may not use this file
    except in compliance with the License. You may obtain a copy of
    the License at http://www.mozilla.org/MPL/

    Software distributed under the License is distributed on an "AS
    IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
    implied. See the License for the specific language governing
    rights and limitations under the License.

    The initial developer of the original code is David A. Hinds
    <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
    are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.

    Alternatively, the contents of this file may be used under the
    terms of the GNU General Public License version 2 (the "GPL"), in
    which case the provisions of the GPL are applicable instead of the
    above.  If you wish to allow the use of your version of this file
    only under the terms of the GPL and not to allow others to use
    your version of this file under the MPL, indicate your decision
    by deleting the provisions above and replace them with the notice
    and other provisions required by the GPL.  If you do not delete
    the provisions above, a recipient may use your version of this
    file under either the MPL or the GPL.
    
======================================================================*/

#include <sys/types.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <dirent.h>

#define SCSI_IOCTL_GET_IDLUN        0x5382
#define SCSI_IOCTL_GET_BUS_NUMBER   0x5386

/*====================================================================*/

static int get_host_no(int host)
{
    DIR *dir;
    struct dirent *ent;
    char fn[128];
    
    dir = opendir("/proc/scsi");
    if (dir == NULL)
      return -1;
    while ((ent = readdir(dir)) != NULL)
      if ((ent->d_ino & 0xff) == host)
          break;
    closedir(dir);
    if (!ent) {
      perror("could not find SCSI host in /proc/scsi");
      return -1;
    }
    
    sprintf(fn, "/proc/scsi/%s", ent->d_name);
    dir = opendir(fn);
    if (dir == NULL) {
      return -1;
    }
    do {
      ent = readdir(dir);
    } while ((ent) && (ent->d_name[0] == '.'));
    closedir(dir);
    if (ent)
      return atoi(ent->d_name);
    else
      return -1;
}

/*====================================================================*/

int main(int argc, char *argv[])
{
    int i, fd, host, channel, id, lun;
    u_int arg[2];
    char match[128], s[128], vendor[9], model[17], rev[5];
    FILE *f;

    if (argc != 2) {
      fprintf(stderr, "usage: %s [device]\n", argv[0]);
      exit(EXIT_FAILURE);
    }
    
    fd = open(argv[1], O_RDONLY);
    if (fd < 0)
      fd = open(argv[1], O_RDONLY|O_NONBLOCK);
    if (fd < 0) {
      perror("open() failed");
      exit(1);
    }
    if (ioctl(fd, SCSI_IOCTL_GET_IDLUN, arg) != 0) {
      perror("could not get SCSI device info");
      exit(1);
    }

    id = arg[0] & 0xff;
    lun = (arg[0] >> 8) & 0xff;
    channel = (arg[0] >> 16) & 0xff;
    host = ((arg[0] >> 24) & 0xff);

    if (ioctl(fd, SCSI_IOCTL_GET_BUS_NUMBER, arg) == 0)
      host = arg[0];
    else
      host = get_host_no(host);

    sprintf(match, "Host: scsi%d Channel: %02x Id: %02x Lun: %02x\n",
          host, channel, id, lun);

    printf("SCSI_ID=\"%d,%d,%d\"\n", channel, id, lun);
    printf("HOST=\"%d\"\n", host);
    
    f = fopen("/proc/scsi/scsi", "r");
    if (f == NULL) {
      printf("MODEL=\"Unknown\"\nFW_REV=\"Unknown\"\n");
      exit(0);
    }

    while (fgets(s, 128, f) != NULL)
      if (strcmp(s, match) == 0) break;
    fgets(s, 128, f);
    strncpy(vendor, s+10, 8); vendor[8] = '\0';
    for (i = 7; (i >= 0) && (vendor[i] == ' '); i--)
      vendor[i] = '\0';
    strncpy(model, s+26, 16); model[16] = '\0';
    for (i = 15; (i >= 0) && (model[i] == ' '); i--)
      model[i] = '\0';
    strncpy(rev, s+48, 4); rev[4] = '\0';
    for (i = 3; (i >= 0) && (rev[i] == ' '); i--)
      rev[i] = '\0';
    printf("MODEL=\"%s %s\"\nFW_REV=\"%s\"\n", vendor, model, rev);
    exit(0);
    return 0;
}

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