miscutils/lsscsi.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * lsscsi implementation for busybox
   4  *
   5  * Copyright (C) 2017 Markus Gothe <nietzsche@lysator.liu.se>
   6  *
   7  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   8  */
   9 //config:config LSSCSI
  10 //config:       bool "lsscsi (2.5 kb)"
  11 //config:       default y
  12 //config:       #select PLATFORM_LINUX
  13 //config:       help
  14 //config:       lsscsi is a utility for displaying information about SCSI buses in the
  15 //config:       system and devices connected to them.
  16 //config:
  17 //config:       This version uses sysfs (/sys/bus/scsi/devices) only.
  18
  19 //applet:IF_LSSCSI(APPLET_NOEXEC(lsscsi, lsscsi, BB_DIR_USR_BIN, BB_SUID_DROP, lsscsi))
  20
  21 //kbuild:lib-$(CONFIG_LSSCSI) += lsscsi.o
  22
  23 //usage:#define lsscsi_trivial_usage NOUSAGE_STR
  24 //usage:#define lsscsi_full_usage ""
  25
  26 #include "libbb.h"
  27
  28 static const char scsi_dir[] ALIGN1 = "/sys/bus/scsi/devices";
  29
  30 static char *get_line(const char *filename, char *buf, unsigned *bufsize_p)
  31 {
  32         unsigned bufsize = *bufsize_p;
  33         ssize_t sz;
  34
  35         if ((int)(bufsize - 2) <= 0)
  36                 return buf;
  37
  38         sz = open_read_close(filename, buf, bufsize - 2);
  39         if (sz < 0)
  40                 sz = 0;
  41         buf[sz] = '\0';
  42
  43         sz = (trim(buf) - buf) + 1;
  44         bufsize -= sz;
  45         buf += sz;
  46         buf[0] = '\0';
  47
  48         *bufsize_p = bufsize;
  49         return buf;
  50 }
  51
  52 int lsscsi_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  53 int lsscsi_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
  54 {
  55         struct dirent *de;
  56         DIR *dir;
  57
  58         xchdir(scsi_dir);
  59
  60         dir = xopendir(".");
  61         while ((de = readdir(dir)) != NULL) {
  62                 char buf[256];
  63                 char *ptr;
  64                 unsigned bufsize;
  65                 const char *vendor;
  66                 const char *type_str;
  67                 const char *type_name;
  68                 const char *model;
  69                 const char *rev;
  70                 unsigned type;
  71
  72                 if (!isdigit(de->d_name[0]))
  73                         continue;
  74                 if (!strchr(de->d_name, ':'))
  75                         continue;
  76                 if (chdir(de->d_name) != 0)
  77                         continue;
  78
  79                 bufsize = sizeof(buf);
  80                 vendor = buf;
  81                 ptr = get_line("vendor", buf, &bufsize);
  82                 type_str = ptr;
  83                 ptr = get_line("type", ptr, &bufsize);
  84                 model = ptr;
  85                 ptr = get_line("model", ptr, &bufsize);
  86                 rev = ptr;
  87                 ptr = get_line("rev", ptr, &bufsize);
  88
  89                 printf("[%s]\t", de->d_name);
  90
  91 #define scsi_device_types \
  92         "disk\0"    "tape\0"    "printer\0" "process\0" \
  93         "worm\0"    "\0"        "scanner\0" "optical\0" \
  94         "mediumx\0" "comms\0"   "\0"        "\0"        \
  95         "storage\0" "enclosu\0" "sim dsk\0" "opti rd\0" \
  96         "bridge\0"  "osd\0"     "adi\0"     "\0"        \
  97         "\0"        "\0"        "\0"        "\0"        \
  98         "\0"        "\0"        "\0"        "\0"        \
  99         "\0"        "\0"        "wlun\0"    "no dev"
 100                 type = bb_strtou(type_str, NULL, 10);
 101                 if (errno
 102                  || type >= 0x20
 103                  || (type_name = nth_string(scsi_device_types, type))[0] == '\0'
 104                 ) {
 105                         printf("(%s)\t", type_str);
 106                 } else {
 107                         printf("%s\t", type_name);
 108                 }
 109
 110                 printf("%s\t""%s\t""%s\n",
 111                         vendor,
 112                         model,
 113                         rev
 114                 );
 115                 /* TODO: also output device column, e.g. "/dev/sdX" */
 116
 117                 /* chdir("..") may not work as expected,
 118                  * since we might have followed a symlink.
 119                  */
 120                 xchdir(scsi_dir);
 121         }
 122
 123         if (ENABLE_FEATURE_CLEAN_UP)
 124                 closedir(dir);
 125
 126         return EXIT_SUCCESS;
 127 }