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/types.h> 27 #include <sys/efi.h> 28 #include <sys/efiio.h> 29 #include <sys/param.h> 30 #include <sys/stat.h> 31 #include <err.h> 32 #include <fcntl.h> 33 #include <getopt.h> 34 #include <stdbool.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <string.h> 38 #include <sysexits.h> 39 #include <unistd.h> 40 #include <uuid.h> 41 #include <libxo/xo.h> 42 43 #define TABLE_MAX_LEN 30 44 #define EFITABLE_XO_VERSION "1" 45 46 static void efi_table_print_esrt(const void *data); 47 static void efi_table_print_prop(const void *data); 48 static void usage(void) __dead2; 49 50 struct efi_table_op { 51 char name[TABLE_MAX_LEN]; 52 void (*parse) (const void *); 53 struct uuid uuid; 54 }; 55 56 static const struct efi_table_op efi_table_ops[] = { 57 { .name = "esrt", .parse = efi_table_print_esrt, 58 .uuid = EFI_TABLE_ESRT }, 59 { .name = "prop", .parse = efi_table_print_prop, 60 .uuid = EFI_PROPERTIES_TABLE } 61 }; 62 63 int 64 main(int argc, char **argv) 65 { 66 struct efi_get_table_ioc table = { 67 .buf = NULL, 68 .buf_len = 0, 69 .table_len = 0 70 }; 71 int efi_fd, ch, rc = 1, efi_idx = -1; 72 bool got_table = false; 73 bool table_set = false; 74 bool uuid_set = false; 75 struct option longopts[] = { 76 { "uuid", required_argument, NULL, 'u' }, 77 { "table", required_argument, NULL, 't' }, 78 { NULL, 0, NULL, 0 } 79 }; 80 81 argc = xo_parse_args(argc, argv); 82 if (argc < 0) 83 exit(EXIT_FAILURE); 84 85 while ((ch = getopt_long(argc, argv, "u:t:", longopts, NULL)) != -1) { 86 switch (ch) { 87 case 'u': 88 { 89 char *uuid_str = optarg; 90 struct uuid uuid; 91 uint32_t status; 92 93 uuid_set = 1; 94 95 uuid_from_string(uuid_str, &uuid, &status); 96 if (status != uuid_s_ok) 97 xo_errx(EX_DATAERR, "invalid UUID"); 98 99 for (size_t n = 0; n < nitems(efi_table_ops); n++) { 100 if (!memcmp(&uuid, &efi_table_ops[n].uuid, 101 sizeof(uuid))) { 102 efi_idx = n; 103 got_table = true; 104 break; 105 } 106 } 107 break; 108 } 109 case 't': 110 { 111 char *table_name = optarg; 112 113 table_set = true; 114 115 for (size_t n = 0; n < nitems(efi_table_ops); n++) { 116 if (!strcmp(table_name, 117 efi_table_ops[n].name)) { 118 efi_idx = n; 119 got_table = true; 120 break; 121 } 122 } 123 124 if (!got_table) 125 xo_errx(EX_DATAERR, "unsupported efi table"); 126 127 break; 128 } 129 default: 130 usage(); 131 } 132 } 133 134 if (!table_set && !uuid_set) 135 xo_errx(EX_USAGE, "table is not set"); 136 137 if (!got_table) 138 xo_errx(EX_DATAERR, "unsupported table"); 139 140 efi_fd = open("/dev/efi", O_RDWR); 141 if (efi_fd < 0) 142 xo_err(EX_OSFILE, "/dev/efi"); 143 144 table.uuid = efi_table_ops[efi_idx].uuid; 145 if (ioctl(efi_fd, EFIIOC_GET_TABLE, &table) == -1) 146 xo_err(EX_OSERR, "EFIIOC_GET_TABLE (len == 0)"); 147 148 table.buf = malloc(table.table_len); 149 table.buf_len = table.table_len; 150 151 if (ioctl(efi_fd, EFIIOC_GET_TABLE, &table) == -1) 152 xo_err(EX_OSERR, "EFIIOC_GET_TABLE"); 153 154 efi_table_ops[efi_idx].parse(table.buf); 155 close(efi_fd); 156 157 return (rc); 158 } 159 160 static void 161 efi_table_print_esrt(const void *data) 162 { 163 const struct efi_esrt_entry_v1 *entries_v1; 164 const struct efi_esrt_table *esrt; 165 166 esrt = (const struct efi_esrt_table *)data; 167 168 xo_set_version(EFITABLE_XO_VERSION); 169 xo_open_container("esrt"); 170 xo_emit("{Lwc:FwResourceCount}{:fw_resource_count/%u}\n", 171 esrt->fw_resource_count); 172 xo_emit("{Lwc:FwResourceCountMax}{:fw_resource_count_max/%u}\n", 173 esrt->fw_resource_count_max); 174 xo_emit("{Lwc:FwResourceVersion}{:fw_resource_version/%u}\n", 175 esrt->fw_resource_version); 176 xo_open_list("entries"); 177 xo_emit("\nEntries:\n"); 178 179 entries_v1 = (const void *) esrt->entries; 180 for (uint32_t i = 0; i < esrt->fw_resource_count; i++) { 181 const struct efi_esrt_entry_v1 *e = &entries_v1[i]; 182 uint32_t status; 183 char *uuid; 184 185 uuid_to_string(&e->fw_class, &uuid, &status); 186 if (status != uuid_s_ok) { 187 xo_errx(EX_DATAERR, "uuid_to_string error"); 188 } 189 190 xo_open_instance("entries"); 191 xo_emit("\n"); 192 xo_emit("{P: }{Lwc:FwClass}{:fw_class/%s}\n", uuid); 193 xo_emit("{P: }{Lwc:FwType}{:fw_type/%u}\n", e->fw_type); 194 xo_emit("{P: }{Lwc:FwVersion}{:fw_version/%u}\n", 195 e->fw_version); 196 xo_emit("{P: }{Lwc:LowestSupportedFwVersion}" 197 "{:lowest_supported_fw_version/%u}\n", 198 e->lowest_supported_fw_version); 199 xo_emit("{P: }{Lwc:CapsuleFlags}{:capsule_flags/%#x}\n", 200 e->capsule_flags); 201 xo_emit("{P: }{Lwc:LastAttemptVersion" 202 "}{:last_attempt_version/%u}\n", e->last_attempt_version); 203 xo_emit("{P: }{Lwc:LastAttemptStatus" 204 "}{:last_attempt_status/%u}\n", e->last_attempt_status); 205 206 xo_close_instance("entries"); 207 } 208 209 xo_close_list("entries"); 210 xo_close_container("esrt"); 211 xo_finish(); 212 } 213 214 static void 215 efi_table_print_prop(const void *data) 216 { 217 const struct efi_prop_table *prop; 218 219 prop = (const struct efi_prop_table *)data; 220 221 xo_set_version(EFITABLE_XO_VERSION); 222 xo_open_container("prop"); 223 xo_emit("{Lwc:Version}{:version/%#x}\n", prop->version); 224 xo_emit("{Lwc:Length}{:length/%u}\n", prop->length); 225 xo_emit("{Lwc:MemoryProtectionAttribute}" 226 "{:memory_protection_attribute/%#lx}\n", 227 prop->memory_protection_attribute); 228 xo_close_container("prop"); 229 xo_finish(); 230 } 231 232 static void usage(void) 233 { 234 xo_error("usage: efitable [-d uuid | -t name] [--libxo]\n"); 235 exit(EX_USAGE); 236 } 237