usr.sbin/efitable/efitable.c

   1 /*-
   2  * Copyright (c) 2021 3mdeb Embedded Systems Consulting <contact@3mdeb.com>
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  23  * SUCH DAMAGE.
  24  */
  25
  26 #include <sys/cdefs.h>
  27 #include <sys/types.h>
  28 #include <sys/efi.h>
  29 #include <sys/efiio.h>
  30 #include <sys/param.h>
  31 #include <sys/stat.h>
  32 #include <err.h>
  33 #include <fcntl.h>
  34 #include <getopt.h>
  35 #include <stdbool.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <sysexits.h>
  40 #include <unistd.h>
  41 #include <uuid.h>
  42 #include <libxo/xo.h>
  43
  44 #define TABLE_MAX_LEN 30
  45 #define EFITABLE_XO_VERSION "1"
  46
  47 static void efi_table_print_esrt(const void *data);
  48 static void efi_table_print_prop(const void *data);
  49 static void usage(void) __dead2;
  50
  51 struct efi_table_op {
  52         char name[TABLE_MAX_LEN];
  53         void (*parse) (const void *);
  54         struct uuid uuid;
  55 };
  56
  57 static const struct efi_table_op efi_table_ops[] = {
  58         { .name = "esrt", .parse = efi_table_print_esrt,
  59             .uuid = EFI_TABLE_ESRT },
  60         { .name = "prop", .parse = efi_table_print_prop,
  61             .uuid = EFI_PROPERTIES_TABLE }
  62 };
  63
  64 int
  65 main(int argc, char **argv)
  66 {
  67         struct efi_get_table_ioc table = {
  68                 .buf = NULL,
  69                 .buf_len = 0,
  70                 .table_len = 0
  71         };
  72         int efi_fd, ch, rc = 1, efi_idx = -1;
  73         bool got_table = false;
  74         bool table_set = false;
  75         bool uuid_set = false;
  76         struct option longopts[] = {
  77                 { "uuid",  required_argument, NULL, 'u' },
  78                 { "table", required_argument, NULL, 't' },
  79                 { NULL,    0,                 NULL,  0  }
  80         };
  81
  82         argc = xo_parse_args(argc, argv);
  83         if (argc < 0)
  84                 exit(EXIT_FAILURE);
  85
  86         while ((ch = getopt_long(argc, argv, "u:t:", longopts, NULL)) != -1) {
  87                 switch (ch) {
  88                 case 'u':
  89                 {
  90                         char *uuid_str = optarg;
  91                         struct uuid uuid;
  92                         uint32_t status;
  93
  94                         uuid_set = 1;
  95
  96                         uuid_from_string(uuid_str, &uuid, &status);
  97                         if (status != uuid_s_ok)
  98                                 xo_errx(EX_DATAERR, "invalid UUID");
  99
 100                         for (size_t n = 0; n < nitems(efi_table_ops); n++) {
 101                                 if (!memcmp(&uuid, &efi_table_ops[n].uuid,
 102                                     sizeof(uuid))) {
 103                                         efi_idx = n;
 104                                         got_table = true;
 105                                         break;
 106                                 }
 107                         }
 108                         break;
 109                 }
 110                 case 't':
 111                 {
 112                         char *table_name = optarg;
 113
 114                         table_set = true;
 115
 116                         for (size_t n = 0; n < nitems(efi_table_ops); n++) {
 117                                 if (!strcmp(table_name,
 118                                     efi_table_ops[n].name)) {
 119                                         efi_idx = n;
 120                                         got_table = true;
 121                                         break;
 122                                 }
 123                         }
 124
 125                         if (!got_table)
 126                                 xo_errx(EX_DATAERR, "unsupported efi table");
 127
 128                         break;
 129                 }
 130                 default:
 131                         usage();
 132                 }
 133         }
 134
 135         if (!table_set && !uuid_set)
 136                 xo_errx(EX_USAGE, "table is not set");
 137
 138         if (!got_table)
 139                 xo_errx(EX_DATAERR, "unsupported table");
 140
 141         efi_fd = open("/dev/efi", O_RDWR);
 142         if (efi_fd < 0)
 143                 xo_err(EX_OSFILE, "/dev/efi");
 144
 145         table.uuid = efi_table_ops[efi_idx].uuid;
 146         if (ioctl(efi_fd, EFIIOC_GET_TABLE, &table) == -1)
 147                 xo_err(EX_OSERR, "EFIIOC_GET_TABLE (len == 0)");
 148
 149         table.buf = malloc(table.table_len);
 150         table.buf_len = table.table_len;
 151
 152         if (ioctl(efi_fd, EFIIOC_GET_TABLE, &table) == -1)
 153                 xo_err(EX_OSERR, "EFIIOC_GET_TABLE");
 154
 155         efi_table_ops[efi_idx].parse(table.buf);
 156         close(efi_fd);
 157
 158         return (rc);
 159 }
 160
 161 static void
 162 efi_table_print_esrt(const void *data)
 163 {
 164         const struct efi_esrt_entry_v1 *entries_v1;
 165         const struct efi_esrt_table *esrt;
 166
 167         esrt = (const struct efi_esrt_table *)data;
 168
 169         xo_set_version(EFITABLE_XO_VERSION);
 170         xo_open_container("esrt");
 171         xo_emit("{Lwc:FwResourceCount}{:fw_resource_count/%u}\n",
 172             esrt->fw_resource_count);
 173         xo_emit("{Lwc:FwResourceCountMax}{:fw_resource_count_max/%u}\n",
 174             esrt->fw_resource_count_max);
 175         xo_emit("{Lwc:FwResourceVersion}{:fw_resource_version/%u}\n",
 176             esrt->fw_resource_version);
 177         xo_open_list("entries");
 178         xo_emit("\nEntries:\n");
 179
 180         entries_v1 = (const void *) esrt->entries;
 181         for (uint32_t i = 0; i < esrt->fw_resource_count; i++) {
 182                 const struct efi_esrt_entry_v1 *e = &entries_v1[i];
 183                 uint32_t status;
 184                 char *uuid;
 185
 186                 uuid_to_string(&e->fw_class, &uuid, &status);
 187                 if (status != uuid_s_ok) {
 188                         xo_errx(EX_DATAERR, "uuid_to_string error");
 189                 }
 190
 191                 xo_open_instance("entries");
 192                 xo_emit("\n");
 193                 xo_emit("{P:  }{Lwc:FwClass}{:fw_class/%s}\n", uuid);
 194                 xo_emit("{P:  }{Lwc:FwType}{:fw_type/%u}\n", e->fw_type);
 195                 xo_emit("{P:  }{Lwc:FwVersion}{:fw_version/%u}\n",
 196                     e->fw_version);
 197                 xo_emit("{P:  }{Lwc:LowestSupportedFwVersion}"
 198                     "{:lowest_supported_fw_version/%u}\n",
 199                     e->lowest_supported_fw_version);
 200                 xo_emit("{P:  }{Lwc:CapsuleFlags}{:capsule_flags/%#x}\n",
 201                     e->capsule_flags);
 202                 xo_emit("{P:  }{Lwc:LastAttemptVersion"
 203                     "}{:last_attempt_version/%u}\n", e->last_attempt_version);
 204                 xo_emit("{P:  }{Lwc:LastAttemptStatus"
 205                     "}{:last_attempt_status/%u}\n", e->last_attempt_status);
 206
 207                 xo_close_instance("entries");
 208         }
 209
 210         xo_close_list("entries");
 211         xo_close_container("esrt");
 212         xo_finish();
 213 }
 214
 215 static void
 216 efi_table_print_prop(const void *data)
 217 {
 218         const struct efi_prop_table *prop;
 219
 220         prop = (const struct efi_prop_table *)data;
 221
 222         xo_set_version(EFITABLE_XO_VERSION);
 223         xo_open_container("prop");
 224         xo_emit("{Lwc:Version}{:version/%#x}\n", prop->version);
 225         xo_emit("{Lwc:Length}{:length/%u}\n", prop->length);
 226         xo_emit("{Lwc:MemoryProtectionAttribute}"
 227             "{:memory_protection_attribute/%#lx}\n",
 228             prop->memory_protection_attribute);
 229         xo_close_container("prop");
 230         xo_finish();
 231 }
 232
 233 static void usage(void)
 234 {
 235         xo_error("usage: efitable [-d uuid | -t name] [--libxo]\n");
 236         exit(EX_USAGE);
 237 }