1 /*- 2 * Copyright (c) 2017-2019 Netflix, Inc. 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 __FBSDID("$FreeBSD$"); 28 29 #include <ctype.h> 30 #include <efivar.h> 31 #include <efivar-dp.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 #include "efiutil.h" 41 #include "efichar.h" 42 #include <efivar-dp.h> 43 44 /* 45 * Dump the data as ASCII data, which is a pretty 46 * printed form 47 */ 48 void 49 asciidump(uint8_t *data, size_t datalen) 50 { 51 size_t i; 52 int len; 53 54 len = 0; 55 for (i = 0; i < datalen; i++) { 56 if (isprint(data[i])) { 57 len++; 58 if (len > 80) { 59 len = 0; 60 printf("\n"); 61 } 62 printf("%c", data[i]); 63 } else { 64 len +=3; 65 if (len > 80) { 66 len = 0; 67 printf("\n"); 68 } 69 printf("%%%02x", data[i]); 70 } 71 } 72 printf("\n"); 73 } 74 75 void 76 utf8dump(uint8_t *data, size_t datalen) 77 { 78 char *utf8 = NULL; 79 efi_char *ucs2; 80 81 /* 82 * NUL terminate the string. Not all strings need it, but some 83 * do and an extra NUL won't change what's printed. 84 */ 85 ucs2 = malloc(datalen + sizeof(efi_char)); 86 memcpy(ucs2, data, datalen); 87 ucs2[datalen / sizeof(efi_char)] = 0; 88 ucs2_to_utf8(ucs2, &utf8); 89 printf("%s\n", utf8); 90 free(utf8); 91 free(ucs2); 92 } 93 94 void 95 hexdump(uint8_t *data, size_t datalen) 96 { 97 size_t i; 98 99 for (i = 0; i < datalen; i++) { 100 if (i % 16 == 0) { 101 if (i != 0) 102 printf("\n"); 103 printf("%04x: ", (int)i); 104 } 105 printf("%02x ", data[i]); 106 } 107 printf("\n"); 108 } 109 110 void 111 bindump(uint8_t *data, size_t datalen) 112 { 113 write(1, data, datalen); 114 } 115 116 #define LOAD_OPTION_ACTIVE 1 117 118 #define SIZE(dp, edp) (size_t)((intptr_t)(void *)edp - (intptr_t)(void *)dp) 119 120 void 121 efi_print_load_option(uint8_t *data, size_t datalen, int Aflag, int bflag, int uflag) 122 { 123 char *dev, *relpath, *abspath; 124 uint8_t *ep = data + datalen; 125 uint8_t *walker = data; 126 uint32_t attr; 127 uint16_t fplen; 128 efi_char *descr; 129 efidp dp, edp; 130 char *str = NULL; 131 char buf[1024]; 132 int len; 133 void *opt; 134 int optlen; 135 int rv; 136 137 if (datalen < sizeof(attr) + sizeof(fplen) + sizeof(efi_char)) 138 return; 139 // First 4 bytes are attribute flags 140 attr = le32dec(walker); 141 walker += sizeof(attr); 142 // Next two bytes are length of the file paths 143 fplen = le16dec(walker); 144 walker += sizeof(fplen); 145 // Next we have a 0 terminated UCS2 string that we know to be aligned 146 descr = (efi_char *)(intptr_t)(void *)walker; 147 len = ucs2len(descr); // XXX need to sanity check that len < (datalen - (ep - walker) / 2) 148 walker += (len + 1) * sizeof(efi_char); 149 if (walker > ep) 150 return; 151 // Now we have fplen bytes worth of file path stuff 152 dp = (efidp)walker; 153 walker += fplen; 154 if (walker > ep) 155 return; 156 edp = (efidp)walker; 157 // Everything left is the binary option args 158 opt = walker; 159 optlen = ep - walker; 160 // We got to here, everything is good 161 printf("%c ", attr & LOAD_OPTION_ACTIVE ? '*' : ' '); 162 ucs2_to_utf8(descr, &str); 163 printf("%s\n", str); 164 free(str); 165 if (fplen <= 4) { 166 printf("Empty path\n"); 167 } else { 168 while (dp < edp && SIZE(dp, edp) > sizeof(efidp_header)) { 169 efidp_format_device_path(buf, sizeof(buf), dp, SIZE(dp, edp)); 170 rv = efivar_device_path_to_unix_path(dp, &dev, &relpath, &abspath); 171 dp = (efidp)((char *)dp + efidp_size(dp)); 172 printf(" %s\n", buf); 173 if (rv == 0) { 174 printf(" %*s:%s\n", len + (int)strlen(dev), dev, relpath); 175 free(dev); 176 free(relpath); 177 free(abspath); 178 } 179 } 180 } 181 if (optlen == 0) 182 return; 183 printf("Option:\n"); 184 if (Aflag) 185 asciidump(opt, optlen); 186 else if (bflag) 187 bindump(opt, optlen); 188 else if (uflag) 189 utf8dump(opt, optlen); 190 else 191 hexdump(opt, optlen); 192 } 193