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 (2.4 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 char *get_line(const char *filename, char *buf, unsigned *bufsize_p)
  29 {
  30         unsigned bufsize = *bufsize_p;
  31         ssize_t sz;
  32
  33         if ((int)(bufsize - 2) <= 0)
  34                 return buf;
  35
  36         sz = open_read_close(filename, buf, bufsize - 2);
  37         if (sz < 0)
  38                 sz = 0;
  39         buf[sz] = '\0';
  40
  41         sz = (trim(buf) - buf) + 1;
  42         bufsize -= sz;
  43         buf += sz;
  44         buf[0] = '\0';
  45
  46         *bufsize_p = bufsize;
  47         return buf;
  48 }
  49
  50 int lsscsi_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  51 int lsscsi_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
  52 {
  53         struct dirent *de;
  54         DIR *dir;
  55
  56         xchdir("/sys/bus/scsi/devices");
  57
  58         dir = xopendir(".");
  59         while ((de = readdir(dir)) != NULL) {
  60                 char buf[256];
  61                 char *ptr;
  62                 unsigned bufsize;
  63                 const char *vendor;
  64                 const char *type_str;
  65                 const char *type_name;
  66                 const char *model;
  67                 const char *rev;
  68                 unsigned type;
  69
  70                 if (!isdigit(de->d_name[0]))
  71                         continue;
  72                 if (!strchr(de->d_name, ':'))
  73                         continue;
  74                 if (chdir(de->d_name) != 0)
  75                         continue;
  76
  77                 bufsize = sizeof(buf);
  78                 vendor = buf;
  79                 ptr = get_line("vendor", buf, &bufsize);
  80                 type_str = ptr;
  81                 ptr = get_line("type", ptr, &bufsize);
  82                 model = ptr;
  83                 ptr = get_line("model", ptr, &bufsize);
  84                 rev = ptr;
  85                 ptr = get_line("rev", ptr, &bufsize);
  86
  87                 printf("[%s]\t", de->d_name);
  88
  89 #define scsi_device_types \
  90         "disk\0"    "tape\0"    "printer\0" "process\0" \
  91         "worm\0"    "\0"        "scanner\0" "optical\0" \
  92         "mediumx\0" "comms\0"   "\0"        "\0"        \
  93         "storage\0" "enclosu\0" "sim dsk\0" "opti rd\0" \
  94         "bridge\0"  "osd\0"     "adi\0"     "\0"        \
  95         "\0"        "\0"        "\0"        "\0"        \
  96         "\0"        "\0"        "\0"        "\0"        \
  97         "\0"        "\0"        "wlun\0"    "no dev"
  98                 type = bb_strtou(type_str, NULL, 10);
  99                 if (errno
 100                  || type >= 0x20
 101                  || (type_name = nth_string(scsi_device_types, type))[0] == '\0'
 102                 ) {
 103                         printf("(%s)\t", type_str);
 104                 } else {
 105                         printf("%s\t", type_name);
 106                 }
 107
 108                 printf("%s\t""%s\t""%s\n",
 109                         vendor,
 110                         model,
 111                         rev
 112                 );
 113                 /* TODO: also output device column, e.g. "/dev/sdX" */
 114
 115                 xchdir("..");
 116         }
 117
 118         if (ENABLE_FEATURE_CLEAN_UP)
 119                 closedir(dir);
 120
 121         return EXIT_SUCCESS;
 122 }