miscutils/makedevs.c

   1 /* vi: set sw=4 ts=4: */
   2
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6 #include <fcntl.h>
   7 #include <getopt.h>
   8 #include <time.h>
   9 #include <unistd.h>
  10 #include <sys/types.h>
  11 #include <sys/sysmacros.h>     /* major() and minor() */
  12 #include "busybox.h"
  13
  14 #ifdef CONFIG_FEATURE_MAKEDEVS_LEAF
  15 /*
  16  * public domain -- Dave 'Kill a Cop' Cinege <dcinege@psychosis.com>
  17  *
  18  * makedevs
  19  * Make ranges of device files quickly.
  20  * known bugs: can't deal with alpha ranges
  21  */
  22 int makedevs_main(int argc, char **argv)
  23 {
  24         mode_t mode;
  25         char *basedev, *type, *nodname, buf[255];
  26         int Smajor, Sminor, S, E;
  27
  28         if (argc < 7 || *argv[1]=='-')
  29                 bb_show_usage();
  30
  31         basedev = argv[1];
  32         type = argv[2];
  33         Smajor = atoi(argv[3]);
  34         Sminor = atoi(argv[4]);
  35         S = atoi(argv[5]);
  36         E = atoi(argv[6]);
  37         nodname = argc == 8 ? basedev : buf;
  38
  39         mode = 0660;
  40
  41         switch (type[0]) {
  42         case 'c':
  43                 mode |= S_IFCHR;
  44                 break;
  45         case 'b':
  46                 mode |= S_IFBLK;
  47                 break;
  48         case 'f':
  49                 mode |= S_IFIFO;
  50                 break;
  51         default:
  52                 bb_show_usage();
  53         }
  54
  55         while (S <= E) {
  56                 int sz;
  57
  58                 sz = snprintf(buf, sizeof(buf), "%s%d", basedev, S);
  59                 if(sz<0 || sz>=sizeof(buf))  /* libc different */
  60                         bb_error_msg_and_die("%s too large", basedev);
  61
  62         /* if mode != S_IFCHR and != S_IFBLK third param in mknod() ignored */
  63
  64                 if (mknod(nodname, mode, makedev(Smajor, Sminor)))
  65                         bb_error_msg("Failed to create: %s", nodname);
  66
  67                 if (nodname == basedev) /* ex. /dev/hda - to /dev/hda1 ... */
  68                         nodname = buf;
  69                 S++;
  70                 Sminor++;
  71         }
  72
  73         return 0;
  74 }
  75
  76 #elif defined CONFIG_FEATURE_MAKEDEVS_TABLE
  77
  78 /*
  79  *  This program is free software; you can redistribute it and/or modify
  80  *  it under the terms of the GNU General Public License version 2 as
  81  *  published by the Free Software Foundation.
  82  *
  83  *  This program is distributed in the hope that it will be useful,
  84  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  85  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  86  *  GNU Library General Public License for more details.
  87  *
  88  *  You should have received a copy of the GNU General Public License
  89  *  along with this program; if not, write to the Free Software
  90  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  91  *
  92  */
  93
  94 static const struct option makedevs_long_options[] = {
  95         {"root", 1, NULL, 'r'},
  96         {0, 0, 0, 0}
  97 };
  98
  99 extern int makedevs_main(int argc, char **argv)
 100 {
 101         FILE *table;
 102         int opt;
 103         char *rootdir = "./";
 104         char *line;
 105         int ret = EXIT_SUCCESS;
 106
 107         bb_opt_complementaly = "d~r";
 108         bb_applet_long_options = makedevs_long_options;
 109         opt = bb_getopt_ulflags(argc, argv, "d:r:", &rootdir, &rootdir);
 110
 111         if (optind + 1 == argc) {
 112                 table = bb_xfopen(argv[optind], "r");
 113         } else {
 114                 table = stdin;
 115         }
 116
 117         if (chdir(rootdir) == -1) {
 118                 bb_perror_msg_and_die("Couldnt chdor to %s", rootdir);
 119         }
 120
 121         umask(0);
 122
 123         while ((line = bb_get_chomped_line_from_file(table))) {
 124                 char type;
 125                 unsigned int mode = 0755;
 126                 unsigned int major = 0;
 127                 unsigned int minor = 0;
 128                 unsigned int count = 0;
 129                 unsigned int increment = 0;
 130                 unsigned int start = 0;
 131                 char name[41];
 132                 char user[41];
 133                 char group[41];
 134                 char *full_name;
 135                 uid_t uid;
 136                 gid_t gid;
 137
 138                 if ((2 > sscanf(line, "%40s %c %o %40s %40s %u %u %u %u %u", name,
 139                         &type, &mode, user, group, &major,
 140                         &minor, &start, &increment, &count)) ||
 141                         ((major | minor | start | count | increment) > 255)) {
 142                         bb_error_msg("Ignoring invalid line\n%s\n", line);
 143                         ret = EXIT_FAILURE;
 144                         continue;
 145                 }
 146                 if (name[0] == '#') {
 147                         continue;
 148                 }
 149                 if (group) {
 150                         gid = get_ug_id(group, my_getgrnam);
 151                 } else {
 152                         gid = getgid();
 153                 }
 154                 if (user) {
 155                         uid = get_ug_id(user, my_getpwnam);
 156                 } else {
 157                         uid = getuid();
 158                 }
 159                 full_name = concat_path_file(rootdir, name);
 160
 161                 if (type == 'd') {
 162                         bb_make_directory(full_name, mode | S_IFDIR, 0);
 163                         if (chown(full_name, uid, gid) == -1) {
 164                                 bb_perror_msg("chown failed for %s", full_name);
 165                                 ret = EXIT_FAILURE;
 166                                 goto loop;
 167                         }
 168                 } else {
 169                         dev_t rdev;
 170
 171                         if (type == 'p') {
 172                                 mode |= S_IFIFO;
 173                         }
 174                         else if (type == 'c') {
 175                                 mode |= S_IFCHR;
 176                         }
 177                         else if (type == 'b') {
 178                                 mode |= S_IFBLK;
 179                         } else {
 180                                 bb_error_msg("Unsupported file type %c", type);
 181                                 ret = EXIT_FAILURE;
 182                                 goto loop;
 183                         }
 184
 185                         if (count > 0) {
 186                                 int i;
 187                                 char *full_name_inc;
 188
 189                                 full_name_inc = xmalloc(strlen(full_name) + 4);
 190                                 for (i = start; i < count; i++) {
 191                                         sprintf(full_name_inc, "%s%d", full_name, i);
 192                                         rdev = (major << 8) + minor + (i * increment - start);
 193                                         if (mknod(full_name_inc, mode, rdev) == -1) {
 194                                                 bb_perror_msg("Couldnt create node %s", full_name_inc);
 195                                                 ret = EXIT_FAILURE;
 196                                         }
 197                                         else if (chown(full_name_inc, uid, gid) == -1) {
 198                                                 bb_perror_msg("chown failed for %s", full_name_inc);
 199                                                 ret = EXIT_FAILURE;
 200                                         }
 201                                 }
 202                                 free(full_name_inc);
 203                         } else {
 204                                 rdev = (major << 8) + minor;
 205                                 if (mknod(full_name, mode, rdev) == -1) {
 206                                         bb_perror_msg("Couldnt create node %s", full_name);
 207                                         ret = EXIT_FAILURE;
 208                                 }
 209                                 else if (chown(full_name, uid, gid) == -1) {
 210                                         bb_perror_msg("chown failed for %s", full_name);
 211                                         ret = EXIT_FAILURE;
 212                                 }
 213                         }
 214                 }
 215 loop:
 216                 free(line);
 217                 free(full_name);
 218         }
 219         fclose(table);
 220
 221         return 0;
 222 }
 223 #else
 224 # error makdedevs configuration error, either leaf or table must be selected
 225 #endif