usr.sbin/efivar/efivar.c

   1 /*-
   2  * Copyright (c) 2016 Netflix, Inc.
   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  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD: head/usr.sbin/efivar/efivar.c 307390 2016-10-16 05:53:18Z imp $");
  29
  30 #include <ctype.h>
  31 #include <efivar.h>
  32 #include <err.h>
  33 #include <errno.h>
  34 #include <getopt.h>
  35 #include <stddef.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <unistd.h>
  40
  41 /* options descriptor */
  42 static struct option longopts[] = {
  43         { "append",             no_argument,            NULL,   'a' },
  44         { "ascii",              no_argument,            NULL,   'A' },
  45         { "attributes",         required_argument,      NULL,   't' },
  46         { "binary",             no_argument,            NULL,   'b' },
  47         { "delete",             no_argument,            NULL,   'D' },
  48         { "fromfile",           required_argument,      NULL,   'f' },
  49         { "hex",                no_argument,            NULL,   'H' },
  50         { "list-guids",         no_argument,            NULL,   'L' },
  51         { "list",               no_argument,            NULL,   'l' },
  52         { "name",               required_argument,      NULL,   'n' },
  53         { "no-name",            no_argument,            NULL,   'N' },
  54         { "print",              no_argument,            NULL,   'p' },
  55         { "print-decimal",      no_argument,            NULL,   'd' },
  56         { "raw-guid",           no_argument,            NULL,   'R' },
  57         { "write",              no_argument,            NULL,   'w' },
  58         { NULL,                 0,                      NULL,   0 }
  59 };
  60
  61
  62 static int aflag, Aflag, bflag, dflag, Dflag, Hflag, Nflag,
  63         lflag, Lflag, Rflag, wflag, pflag;
  64 static char *varname;
  65 static u_long attrib = EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS;
  66
  67 static void
  68 usage(void)
  69 {
  70
  71         errx(1, "efivar [-abdDHlLNpRtw] [-n name] [-f file] [--append] [--ascii]\n"
  72             "\t[--attributes] [--binary] [--delete] [--fromfile file] [--hex]\n"
  73             "\t[--list-guids] [--list] [--name name] [--no-name] [--print]\n"
  74             "\t[--print-decimal] [--raw-guid] [--write] name[=value]");
  75 }
  76
  77 static void
  78 breakdown_name(char *name, efi_guid_t *guid, char **vname)
  79 {
  80         char *cp;
  81
  82         cp = strrchr(name, '-');
  83         if (cp == NULL)
  84                 errx(1, "Invalid name: %s", name);
  85         *vname = cp + 1;
  86         *cp = '\0';
  87         if (efi_str_to_guid(name, guid) < 0)
  88                 errx(1, "Invalid guid %s", name);
  89 }
  90
  91 static uint8_t *
  92 get_value(char *val, size_t *datalen)
  93 {
  94         static char buffer[16*1024];
  95
  96         if (val != NULL) {
  97                 *datalen = strlen(val);
  98                 return ((uint8_t *)val);
  99         }
 100         /* Read from stdin */
 101         *datalen = sizeof(buffer);
 102         *datalen = read(0, buffer, *datalen);
 103         return ((uint8_t *)buffer);
 104 }
 105
 106 static void
 107 append_variable(char *name, char *val)
 108 {
 109         char *vname;
 110         efi_guid_t guid;
 111         size_t datalen;
 112         uint8_t *data;
 113
 114         breakdown_name(name, &guid, &vname);
 115         data = get_value(val, &datalen);
 116         if (efi_append_variable(guid, vname, data, datalen, attrib) < 0)
 117                 err(1, "efi_append_variable");
 118 }
 119
 120 static void
 121 delete_variable(char *name)
 122 {
 123         char *vname;
 124         efi_guid_t guid;
 125
 126         breakdown_name(name, &guid, &vname);
 127         if (efi_del_variable(guid, vname) < 0)
 128                 err(1, "efi_del_variable");
 129 }
 130
 131 static void
 132 write_variable(char *name, char *val)
 133 {
 134         char *vname;
 135         efi_guid_t guid;
 136         size_t datalen;
 137         uint8_t *data;
 138
 139         breakdown_name(name, &guid, &vname);
 140         data = get_value(val, &datalen);
 141         if (efi_set_variable(guid, vname, data, datalen, attrib, 0) < 0)
 142                 err(1, "efi_set_variable");
 143 }
 144
 145 static void
 146 asciidump(uint8_t *data, size_t datalen)
 147 {
 148         size_t i;
 149         int len;
 150
 151         len = 0;
 152         if (!Nflag)
 153                 printf("\n");
 154         for (i = 0; i < datalen; i++) {
 155                 if (isprint(data[i])) {
 156                         len++;
 157                         if (len > 80) {
 158                                 len = 0;
 159                                 printf("\n");
 160                         }
 161                         printf("%c", data[i]);
 162                 } else {
 163                         len +=3;
 164                         if (len > 80) {
 165                                 len = 0;
 166                                 printf("\n");
 167                         }
 168                         printf("%%%02x", data[i]);
 169                 }
 170         }
 171         printf("\n");
 172 }
 173
 174 static void
 175 hexdump(uint8_t *data, size_t datalen)
 176 {
 177         size_t i;
 178
 179         if (!Nflag)
 180                 printf("\n");
 181         for (i = 0; i < datalen; i++) {
 182                 if (i % 16 == 0) {
 183                         if (i != 0)
 184                                 printf("\n");
 185                         printf("%04x: ", (int)i);
 186                 }
 187                 printf("%02x ", data[i]);
 188         }
 189         printf("\n");
 190 }
 191
 192 static void
 193 bindump(uint8_t *data, size_t datalen)
 194 {
 195         write(1, data, datalen);
 196 }
 197
 198 static void
 199 print_var(efi_guid_t *guid, char *name)
 200 {
 201         uint32_t att;
 202         uint8_t *data;
 203         size_t datalen;
 204         char *gname;
 205         int rv;
 206
 207         efi_guid_to_str(guid, &gname);
 208         if (!Nflag)
 209                 printf("%s-%s", gname, name);
 210         if (pflag) {
 211                 rv = efi_get_variable(*guid, name, &data, &datalen, &att);
 212
 213                 if (rv < 0)
 214                         printf("\n --- Error getting value --- %d", errno);
 215                 else {
 216                         if (Aflag)
 217                                 asciidump(data, datalen);
 218                         else if (bflag)
 219                                 bindump(data, datalen);
 220                         else
 221                                 hexdump(data, datalen);
 222                 }
 223         }
 224         free(gname);
 225         if (!Nflag)
 226                 printf("\n");
 227 }
 228
 229 static void
 230 print_variable(char *name)
 231 {
 232         char *vname;
 233         efi_guid_t guid;
 234
 235         breakdown_name(name, &guid, &vname);
 236         print_var(&guid, vname);
 237 }
 238
 239 static void
 240 print_variables(void)
 241 {
 242         int rv;
 243         char *name = NULL;
 244         efi_guid_t *guid = NULL;
 245
 246         while ((rv = efi_get_next_variable_name(&guid, &name)) > 0)
 247                 print_var(guid, name);
 248
 249         if (rv < 0)
 250                 err(1, "Error listing names");
 251 }
 252
 253 static void
 254 parse_args(int argc, char **argv)
 255 {
 256         int ch, i;
 257
 258         while ((ch = getopt_long(argc, argv, "aAbdDf:HlLNn:pRt:w",
 259                     longopts, NULL)) != -1) {
 260                 switch (ch) {
 261                 case 'a':
 262                         aflag++;
 263                         break;
 264                 case 'A':
 265                         Aflag++;
 266                         break;
 267                 case 'b':
 268                         bflag++;
 269                         break;
 270                 case 'd':
 271                         dflag++;
 272                         break;
 273                 case 'D':
 274                         Dflag++;
 275                         break;
 276                 case 'H':
 277                         Hflag++;
 278                         break;
 279                 case 'l':
 280                         lflag++;
 281                         break;
 282                 case 'L':
 283                         Lflag++;
 284                         break;
 285                 case 'n':
 286                         varname = optarg;
 287                         break;
 288                 case 'N':
 289                         Nflag++;
 290                         break;
 291                 case 'p':
 292                         pflag++;
 293                         break;
 294                 case 'R':
 295                         Rflag++;
 296                         break;
 297                 case 't':
 298                         attrib = strtoul(optarg, NULL, 16);
 299                         break;
 300                 case 'w':
 301                         wflag++;
 302                         break;
 303                 case 'f':
 304                 case 0:
 305                         errx(1, "unknown or unimplemented option\n");
 306                         break;
 307                 default:
 308                         usage();
 309                 }
 310         }
 311         argc -= optind;
 312         argv += optind;
 313
 314         if (argc == 1)
 315                 varname = argv[0];
 316
 317         if (aflag + Dflag + wflag > 1) {
 318                 warnx("Can only use one of -a (--append), "
 319                     "-D (--delete) and -w (--write)");
 320                 usage();
 321         }
 322
 323         if (aflag + Dflag + wflag > 0 && varname == NULL) {
 324                 warnx("Must specify a variable for -a (--append), "
 325                     "-D (--delete) or -w (--write)");
 326                 usage();
 327         }
 328
 329         if (aflag)
 330                 append_variable(varname, NULL);
 331         else if (Dflag)
 332                 delete_variable(varname);
 333         else if (wflag)
 334                 write_variable(varname, NULL);
 335         else if (varname) {
 336                 pflag++;
 337                 print_variable(varname);
 338         } else if (argc > 0) {
 339                 pflag++;
 340                 for (i = 0; i < argc; i++)
 341                         print_variable(argv[i]);
 342         } else
 343                 print_variables();
 344 }
 345
 346 int
 347 main(int argc, char **argv)
 348 {
 349
 350         parse_args(argc, argv);
 351 }