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
  27 #include <sys/cdefs.h>
  28 #ifdef __FBSDID
  29 __FBSDID("$FreeBSD: src/sbin/gpt/label.c,v 1.3 2006/10/04 18:20:25 marcel Exp $");
  30 #endif
  31 #ifdef __RCSID
  32 __RCSID("$NetBSD: label.c,v 1.6 2007/12/19 05:48:34 dogcow Exp $");
  33 #endif
  34
  35 #include <sys/types.h>
  36
  37 #include <err.h>
  38 #include <stddef.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <unistd.h>
  43
  44 #include "map.h"
  45 #include "gpt.h"
  46
  47 static int all;
  48 static uuid_t type;
  49 static off_t block, size;
  50 static unsigned int entry;
  51 static uint8_t *name;
  52
  53 const char labelmsg1[] = "label -a <-l label | -f file> device ...";
  54 const char labelmsg2[] = "label [-b lba] [-i index] [-s lba]";
  55 const char labelmsg3[] = "      [-t uuid] <-l label | -f file> device ...";
  56
  57 static void
  58 usage_label(void)
  59 {
  60         fprintf(stderr,
  61             "usage: %s %s\n"
  62             "       %s %s\n"
  63             "       %*s %s\n", getprogname(), labelmsg1,
  64             getprogname(), labelmsg2, (int)strlen(getprogname()), "", labelmsg3);
  65         exit(1);
  66 }
  67
  68 static void
  69 label(int fd)
  70 {
  71         uuid_t uuid;
  72         map_t *gpt, *tpg;
  73         map_t *tbl, *lbt;
  74         map_t *m;
  75         struct gpt_hdr *hdr;
  76         struct gpt_ent *ent;
  77         unsigned int i;
  78
  79         gpt = map_find(MAP_TYPE_PRI_GPT_HDR);
  80         if (gpt == NULL) {
  81                 warnx("%s: error: no primary GPT header; run create or recover",
  82                     device_name);
  83                 return;
  84         }
  85
  86         tpg = map_find(MAP_TYPE_SEC_GPT_HDR);
  87         if (tpg == NULL) {
  88                 warnx("%s: error: no secondary GPT header; run recover",
  89                     device_name);
  90                 return;
  91         }
  92
  93         tbl = map_find(MAP_TYPE_PRI_GPT_TBL);
  94         lbt = map_find(MAP_TYPE_SEC_GPT_TBL);
  95         if (tbl == NULL || lbt == NULL) {
  96                 warnx("%s: error: run recover -- trust me", device_name);
  97                 return;
  98         }
  99
 100         /* Relabel all matching entries in the map. */
 101         for (m = map_first(); m != NULL; m = m->map_next) {
 102                 if (m->map_type != MAP_TYPE_GPT_PART || m->map_index < 1)
 103                         continue;
 104                 if (entry > 0 && entry != m->map_index)
 105                         continue;
 106                 if (block > 0 && block != m->map_start)
 107                         continue;
 108                 if (size > 0 && size != m->map_size)
 109                         continue;
 110
 111                 i = m->map_index - 1;
 112
 113                 hdr = gpt->map_data;
 114                 ent = (void*)((char*)tbl->map_data + i *
 115                     le32toh(hdr->hdr_entsz));
 116                 le_uuid_dec(&ent->ent_type, &uuid);
 117                 if (!uuid_is_nil(&type, NULL) &&
 118                     !uuid_equal(&type, &uuid, NULL))
 119                         continue;
 120
 121                 /* Label the primary entry. */
 122                 utf8_to_utf16(name, ent->ent_name, 36);
 123
 124                 hdr->hdr_crc_table = htole32(crc32(tbl->map_data,
 125                     le32toh(hdr->hdr_entries) * le32toh(hdr->hdr_entsz)));
 126                 hdr->hdr_crc_self = 0;
 127                 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));
 128
 129                 gpt_write(fd, gpt);
 130                 gpt_write(fd, tbl);
 131
 132                 hdr = tpg->map_data;
 133                 ent = (void*)((char*)lbt->map_data + i *
 134                     le32toh(hdr->hdr_entsz));
 135
 136                 /* Label the secundary entry. */
 137                 utf8_to_utf16(name, ent->ent_name, 36);
 138
 139                 hdr->hdr_crc_table = htole32(crc32(lbt->map_data,
 140                     le32toh(hdr->hdr_entries) * le32toh(hdr->hdr_entsz)));
 141                 hdr->hdr_crc_self = 0;
 142                 hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));
 143
 144                 gpt_write(fd, lbt);
 145                 gpt_write(fd, tpg);
 146
 147 #ifdef __FreeBSD__
 148                 printf("%sp%u labeled\n", device_name, m->map_index);
 149 #endif
 150 #ifdef __NetBSD__
 151                 printf("partition %d on %s labeled %s\n", m->map_index,
 152                     device_name, name);
 153 #endif
 154         }
 155 }
 156
 157 static void
 158 name_from_file(const char *fn)
 159 {
 160         FILE *f;
 161         char *p;
 162         size_t maxlen = 1024;
 163         size_t len;
 164
 165         if (strcmp(fn, "-") != 0) {
 166                 f = fopen(fn, "r");
 167                 if (f == NULL)
 168                         err(1, "unable to open file %s", fn);
 169         } else
 170                 f = stdin;
 171         name = malloc(maxlen);
 172         len = fread(name, 1, maxlen - 1, f);
 173         if (ferror(f))
 174                 err(1, "unable to read label from file %s", fn);
 175         if (f != stdin)
 176                 fclose(f);
 177         name[len] = '\0';
 178         /* Only keep the first line, excluding the newline character. */
 179         p = strchr((const char *)name, '\n');
 180         if (p != NULL)
 181                 *p = '\0';
 182 }
 183
 184 int
 185 cmd_label(int argc, char *argv[])
 186 {
 187         char *p;
 188         int ch, fd;
 189
 190         /* Get the label options */
 191         while ((ch = getopt(argc, argv, "ab:f:i:l:s:t:")) != -1) {
 192                 switch(ch) {
 193                 case 'a':
 194                         if (all > 0)
 195                                 usage_label();
 196                         all = 1;
 197                         break;
 198                 case 'b':
 199                         if (block > 0)
 200                                 usage_label();
 201                         block = strtoll(optarg, &p, 10);
 202                         if (*p != 0 || block < 1)
 203                                 usage_label();
 204                         break;
 205                 case 'f':
 206                         if (name != NULL)
 207                                 usage_label();
 208                         name_from_file(optarg);
 209                         break;
 210                 case 'i':
 211                         if (entry > 0)
 212                                 usage_label();
 213                         entry = strtoul(optarg, &p, 10);
 214                         if (*p != 0 || entry < 1)
 215                                 usage_label();
 216                         break;
 217                 case 'l':
 218                         if (name != NULL)
 219                                 usage_label();
 220                         name = (uint8_t *)strdup(optarg);
 221                         break;
 222                 case 's':
 223                         if (size > 0)
 224                                 usage_label();
 225                         size = strtoll(optarg, &p, 10);
 226                         if (*p != 0 || size < 1)
 227                                 usage_label();
 228                         break;
 229                 case 't':
 230                         if (!uuid_is_nil(&type, NULL))
 231                                 usage_label();
 232                         if (parse_uuid(optarg, &type) != 0)
 233                                 usage_label();
 234                         break;
 235                 default:
 236                         usage_label();
 237                 }
 238         }
 239
 240         if (!all ^
 241             (block > 0 || entry > 0 || size > 0 || !uuid_is_nil(&type, NULL)))
 242                 usage_label();
 243
 244         if (name == NULL || argc == optind)
 245                 usage_label();
 246
 247         while (optind < argc) {
 248                 fd = gpt_open(argv[optind++]);
 249                 if (fd == -1) {
 250                         warn("unable to open device '%s'", device_name);
 251                         continue;
 252                 }
 253
 254                 label(fd);
 255
 256                 gpt_close(fd);
 257         }
 258
 259         return (0);
 260 }