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 } 238