sbin/gpt/label.c

   1 /*-
   2  * Copyright (c) 2005 Marcel Moolenaar
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/sbin/gpt/label.c,v 1.3 2006/10/04 18:20:25 marcel Exp $
  27  * $DragonFly: src/sbin/gpt/label.c,v 1.2 2007/06/17 08:34:59 dillon Exp $
  28  */
  29
  30 #include <sys/types.h>
  31
  32 #include <err.h>
  33 #include <stddef.h>
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37 #include <unistd.h>
  38
  39 #include "map.h"
  40 #include "gpt.h"
  41
  42 static int all;
  43 static uuid_t type;
  44 static off_t block, size;
  45 static unsigned int entry = NOENTRY;
  46 static uint8_t *name;
  47
  48 static void
  49 usage_label(void)
  50 {
  51         const char *common = "<-l label | -f file> device ...";
  52
  53         fprintf(stderr,
  54             "usage: %s -a %s\n"
  55             "       %s [-b lba] [-i index] [-s lba] [-t uuid] %s\n",
  56             getprogname(), common, getprogname(), common);
  57         exit(1);
  58 }
  59
  60 static void
  61 label(int fd)
  62 {
  63         uuid_t uuid;
  64         map_t *gpt, *tpg;
  65         map_t *tbl, *lbt;
  66         map_t *m;
  67         struct gpt_hdr *hdr;
  68         struct gpt_ent *ent;
  69         unsigned int i;
  70
  71         gpt = map_find(MAP_TYPE_PRI_GPT_HDR);
  72         if (gpt == NULL) {
  73                 warnx("%s: error: no primary GPT header; run create or recover",
  74                     device_name);
  75                 return;
  76         }
  77
  78         tpg = map_find(MAP_TYPE_SEC_GPT_HDR);
  79         if (tpg == NULL) {
  80                 warnx("%s: error: no secondary GPT header; run recover",
  81                     device_name);
  82                 return;
  83         }
  84
  85         tbl = map_find(MAP_TYPE_PRI_GPT_TBL);
  86         lbt = map_find(MAP_TYPE_SEC_GPT_TBL);
  87         if (tbl == NULL || lbt == NULL) {
  88                 warnx("%s: error: run recover -- trust me", device_name);
  89                 return;
  90         }
  91
  92         /* Relabel all matching entries in the map. */
  93         for (m = map_first(); m != NULL; m = m->map_next) {
  94                 if (m->map_type != MAP_TYPE_GPT_PART || m->map_index == NOENTRY)
  95                         continue;
  96                 if (entry != NOENTRY && entry != m->map_index)
  97                         continue;
  98                 if (block > 0 && block != m->map_start)
  99                         continue;
 100                 if (size > 0 && size != m->map_size)
 101                         continue;
 102
 103                 i = m->map_index;
 104
 105                 hdr = gpt->map_data;
 106                 ent = (void*)((char*)tbl->map_data + i *
 107                     le32toh(hdr->hdr_entsz));
 108                 le_uuid_dec(&ent->ent_type, &uuid);
 109                 if (!uuid_is_nil(&type, NULL) &&
 110                     !uuid_equal(&type, &uuid, NULL))
 111                         continue;
 112
 113                 /* Label the primary entry. */
 114                 utf8_to_utf16(name, ent->ent_name, 36);
 115
 116                 hdr->hdr_crc_table = htole32(crc32(tbl->map_data,
 117                     le32toh(hdr->hdr_entries) * le32toh(hdr->hdr_entsz)));
 118                 hdr->hdr_crc_self = 0;
 119                 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));
 120
 121                 gpt_write(fd, gpt);
 122                 gpt_write(fd, tbl);
 123
 124                 hdr = tpg->map_data;
 125                 ent = (void*)((char*)lbt->map_data + i *
 126                     le32toh(hdr->hdr_entsz));
 127
 128                 /* Label the secundary entry. */
 129                 utf8_to_utf16(name, ent->ent_name, 36);
 130
 131                 hdr->hdr_crc_table = htole32(crc32(lbt->map_data,
 132                     le32toh(hdr->hdr_entries) * le32toh(hdr->hdr_entsz)));
 133                 hdr->hdr_crc_self = 0;
 134                 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));
 135
 136                 gpt_write(fd, lbt);
 137                 gpt_write(fd, tpg);
 138
 139                 printf("%ss%u labeled\n", device_name, m->map_index);
 140         }
 141 }
 142
 143 static void
 144 name_from_file(const char *fn)
 145 {
 146         FILE *f;
 147         char *p;
 148         size_t maxlen = 1024;
 149         size_t len;
 150
 151         if (strcmp(fn, "-") != 0) {
 152                 f = fopen(fn, "r");
 153                 if (f == NULL)
 154                         err(1, "unable to open file %s", fn);
 155         } else
 156                 f = stdin;
 157         name = malloc(maxlen);
 158         len = fread(name, 1, maxlen - 1, f);
 159         if (ferror(f))
 160                 err(1, "unable to read label from file %s", fn);
 161         if (f != stdin)
 162                 fclose(f);
 163         name[len] = '\0';
 164         /* Only keep the first line, excluding the newline character. */
 165         p = strchr(name, '\n');
 166         if (p != NULL)
 167                 *p = '\0';
 168 }
 169
 170 int
 171 cmd_label(int argc, char *argv[])
 172 {
 173         char *p;
 174         int ch, fd;
 175
 176         /* Get the label options */
 177         while ((ch = getopt(argc, argv, "ab:f:i:l:s:t:")) != -1) {
 178                 switch(ch) {
 179                 case 'a':
 180                         if (all > 0)
 181                                 usage_label();
 182                         all = 1;
 183                         break;
 184                 case 'b':
 185                         if (block > 0)
 186                                 usage_label();
 187                         block = strtoll(optarg, &p, 10);
 188                         if (*p != 0 || block < 1)
 189                                 usage_label();
 190                         break;
 191                 case 'f':
 192                         if (name != NULL)
 193                                 usage_label();
 194                         name_from_file(optarg);
 195                         break;
 196                 case 'i':
 197                         if (entry != NOENTRY)
 198                                 usage_label();
 199                         entry = strtoul(optarg, &p, 10);
 200                         if (*p != 0 || entry == NOENTRY)
 201                                 usage_label();
 202                         break;
 203                 case 'l':
 204                         if (name != NULL)
 205                                 usage_label();
 206                         name = strdup(optarg);
 207                         break;
 208                 case 's':
 209                         if (size > 0)
 210                                 usage_label();
 211                         size = strtoll(optarg, &p, 10);
 212                         if (*p != 0 || size < 1)
 213                                 usage_label();
 214                         break;
 215                 case 't':
 216                         if (!uuid_is_nil(&type, NULL))
 217                                 usage_label();
 218                         if (parse_uuid(optarg, &type) != 0)
 219                                 usage_label();
 220                         break;
 221                 default:
 222                         usage_label();
 223                 }
 224         }
 225
 226         if (!all ^
 227             (block > 0 || entry != NOENTRY || size > 0 ||
 228              !uuid_is_nil(&type, NULL)))
 229                 usage_label();
 230
 231         if (name == NULL || argc == optind)
 232                 usage_label();
 233
 234         while (optind < argc) {
 235                 fd = gpt_open(argv[optind++]);
 236                 if (fd == -1) {
 237                         warn("unable to open device '%s'", device_name);
 238                         continue;
 239                 }
 240
 241                 label(fd);
 242
 243                 gpt_close(fd);
 244         }
 245
 246         return (0);
 247 }