miscutils/makedevs.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * public domain -- Dave 'Kill a Cop' Cinege <dcinege@psychosis.com>
   4  *
   5  * makedevs
   6  * Make ranges of device files quickly.
   7  * known bugs: can't deal with alpha ranges
   8  */
   9
  10 #include "busybox.h"
  11
  12 #ifdef CONFIG_FEATURE_MAKEDEVS_LEAF
  13 int makedevs_main(int argc, char **argv)
  14 {
  15         mode_t mode;
  16         char *basedev, *type, *nodname, buf[255];
  17         int Smajor, Sminor, S, E;
  18
  19         if (argc < 7 || *argv[1]=='-')
  20                 bb_show_usage();
  21
  22         basedev = argv[1];
  23         type = argv[2];
  24         Smajor = atoi(argv[3]);
  25         Sminor = atoi(argv[4]);
  26         S = atoi(argv[5]);
  27         E = atoi(argv[6]);
  28         nodname = argc == 8 ? basedev : buf;
  29
  30         mode = 0660;
  31
  32         switch (type[0]) {
  33         case 'c':
  34                 mode |= S_IFCHR;
  35                 break;
  36         case 'b':
  37                 mode |= S_IFBLK;
  38                 break;
  39         case 'f':
  40                 mode |= S_IFIFO;
  41                 break;
  42         default:
  43                 bb_show_usage();
  44         }
  45
  46         while (S <= E) {
  47                 int sz;
  48
  49                 sz = snprintf(buf, sizeof(buf), "%s%d", basedev, S);
  50                 if(sz<0 || sz>=sizeof(buf))  /* libc different */
  51                         bb_error_msg_and_die("%s too large", basedev);
  52
  53         /* if mode != S_IFCHR and != S_IFBLK third param in mknod() ignored */
  54
  55                 if (mknod(nodname, mode, makedev(Smajor, Sminor)))
  56                         bb_error_msg("Failed to create: %s", nodname);
  57
  58                 if (nodname == basedev) /* ex. /dev/hda - to /dev/hda1 ... */
  59                         nodname = buf;
  60                 S++;
  61                 Sminor++;
  62         }
  63
  64         return 0;
  65 }
  66
  67 #elif defined CONFIG_FEATURE_MAKEDEVS_TABLE
  68
  69 /* Licensed under the GPL v2 or later, see the file LICENSE in this tarball. */
  70
  71 int makedevs_main(int argc, char **argv)
  72 {
  73         FILE *table = stdin;
  74         char *rootdir = NULL;
  75         char *line = NULL;
  76         int linenum = 0;
  77         int ret = EXIT_SUCCESS;
  78
  79         unsigned long flags;
  80         flags = bb_getopt_ulflags(argc, argv, "d:", &line);
  81         if (line)
  82                 table = xfopen(line, "r");
  83
  84         if (optind >= argc || (rootdir=argv[optind])==NULL) {
  85                 bb_error_msg_and_die("root directory not specified");
  86         }
  87
  88         xchdir(rootdir);
  89
  90         umask(0);
  91
  92         printf("rootdir=%s\n", rootdir);
  93         if (line) {
  94                 printf("table='%s'\n", line);
  95         } else {
  96                 printf("table=<stdin>\n");
  97         }
  98
  99         while ((line = bb_get_chomped_line_from_file(table))) {
 100                 char type;
 101                 unsigned int mode = 0755;
 102                 unsigned int major = 0;
 103                 unsigned int minor = 0;
 104                 unsigned int count = 0;
 105                 unsigned int increment = 0;
 106                 unsigned int start = 0;
 107                 char name[41];
 108                 char user[41];
 109                 char group[41];
 110                 char *full_name;
 111                 uid_t uid;
 112                 gid_t gid;
 113
 114                 linenum++;
 115
 116                 if ((2 > sscanf(line, "%40s %c %o %40s %40s %u %u %u %u %u", name,
 117                                                 &type, &mode, user, group, &major,
 118                                                 &minor, &start, &increment, &count)) ||
 119                                 ((major | minor | start | count | increment) > 255))
 120                 {
 121                         if (*line=='\0' || *line=='#' || isspace(*line))
 122                                 continue;
 123                         bb_error_msg("line %d invalid: '%s'\n", linenum, line);
 124                         ret = EXIT_FAILURE;
 125                         continue;
 126                 }
 127                 if (name[0] == '#') {
 128                         continue;
 129                 }
 130
 131                 gid = (*group) ? get_ug_id(group, bb_xgetgrnam) : getgid();
 132                 uid = (*user) ? get_ug_id(user, bb_xgetpwnam) : getuid();
 133                 full_name = concat_path_file(rootdir, name);
 134
 135                 if (type == 'd') {
 136                         bb_make_directory(full_name, mode | S_IFDIR, FILEUTILS_RECUR);
 137                         if (chown(full_name, uid, gid) == -1) {
 138                                 bb_perror_msg("line %d: chown failed for %s", linenum, full_name);
 139                                 ret = EXIT_FAILURE;
 140                                 goto loop;
 141                         }
 142                         if ((mode != -1) && (chmod(full_name, mode) < 0)){
 143                                 bb_perror_msg("line %d: chmod failed for %s", linenum, full_name);
 144                                 ret = EXIT_FAILURE;
 145                                 goto loop;
 146                         }
 147                 } else if (type == 'f') {
 148                         struct stat st;
 149                         if ((stat(full_name, &st) < 0 || !S_ISREG(st.st_mode))) {
 150                                 bb_perror_msg("line %d: regular file '%s' does not exist", linenum, full_name);
 151                                 ret = EXIT_FAILURE;
 152                                 goto loop;
 153                         }
 154                         if (chown(full_name, uid, gid) == -1) {
 155                                 bb_perror_msg("line %d: chown failed for %s", linenum, full_name);
 156                                 ret = EXIT_FAILURE;
 157                                 goto loop;
 158                         }
 159                         if ((mode != -1) && (chmod(full_name, mode) < 0)){
 160                                 bb_perror_msg("line %d: chmod failed for %s", linenum, full_name);
 161                                 ret = EXIT_FAILURE;
 162                                 goto loop;
 163                         }
 164                 } else
 165                 {
 166                         dev_t rdev;
 167
 168                         if (type == 'p') {
 169                                 mode |= S_IFIFO;
 170                         }
 171                         else if (type == 'c') {
 172                                 mode |= S_IFCHR;
 173                         }
 174                         else if (type == 'b') {
 175                                 mode |= S_IFBLK;
 176                         } else {
 177                                 bb_error_msg("line %d: unsupported file type %c", linenum, type);
 178                                 ret = EXIT_FAILURE;
 179                                 goto loop;
 180                         }
 181
 182                         if (count > 0) {
 183                                 int i;
 184                                 char *full_name_inc;
 185
 186                                 full_name_inc = xmalloc(strlen(full_name) + 4);
 187                                 for (i = start; i < count; i++) {
 188                                         sprintf(full_name_inc, "%s%d", full_name, i);
 189                                         rdev = (major << 8) + minor + (i * increment - start);
 190                                         if (mknod(full_name_inc, mode, rdev) == -1) {
 191                                                 bb_perror_msg("line %d: could not create node %s", linenum, full_name_inc);
 192                                                 ret = EXIT_FAILURE;
 193                                         }
 194                                         else if (chown(full_name_inc, uid, gid) == -1) {
 195                                                 bb_perror_msg("line %d: chown failed for %s", linenum, full_name_inc);
 196                                                 ret = EXIT_FAILURE;
 197                                         }
 198                                         if ((mode != -1) && (chmod(full_name_inc, mode) < 0)){
 199                                                 bb_perror_msg("line %d: chmod failed for %s", linenum, full_name_inc);
 200                                                 ret = EXIT_FAILURE;
 201                                         }
 202                                 }
 203                                 free(full_name_inc);
 204                         } else {
 205                                 rdev = (major << 8) + minor;
 206                                 if (mknod(full_name, mode, rdev) == -1) {
 207                                         bb_perror_msg("line %d: could not create node %s", linenum, full_name);
 208                                         ret = EXIT_FAILURE;
 209                                 }
 210                                 else if (chown(full_name, uid, gid) == -1) {
 211                                         bb_perror_msg("line %d: chown failed for %s", linenum, full_name);
 212                                         ret = EXIT_FAILURE;
 213                                 }
 214                                 if ((mode != -1) && (chmod(full_name, mode) < 0)){
 215                                         bb_perror_msg("line %d: chmod failed for %s", linenum, full_name);
 216                                         ret = EXIT_FAILURE;
 217                                 }
 218                         }
 219                 }
 220 loop:
 221                 free(line);
 222                 free(full_name);
 223         }
 224         fclose(table);
 225
 226         return ret;
 227 }
 228
 229 #else
 230 # error makedevs configuration error, either leaf or table must be selected
 231 #endif