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 * $FreeBSD: head/usr.sbin/efivar/efiutil.c 344337 2019-02-20 05:19:16Z bcran $ 26 */ 27 28 #include <ctype.h> 29 #include <efivar.h> 30 #include <efivar-dp.h> 31 #include <err.h> 32 #include <errno.h> 33 #include <getopt.h> 34 #include <stddef.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <string.h> 38 #include <unistd.h> 39 #include "efiutil.h" 40 #include "libefivar_int.h" 41 42 /* 43 * Dump the data as ASCII data, which is a pretty 44 * printed form 45 */ 46 void 47 asciidump(uint8_t *data, size_t datalen) 48 { 49 size_t i; 50 int len; 51 52 len = 0; 53 for (i = 0; i < datalen; i++) { 54 if (isprint(data[i])) { 55 len++; 56 if (len > 80) { 57 len = 0; 58 printf("\n"); 59 } 60 printf("%c", data[i]); 61 } else { 62 len +=3; 63 if (len > 80) { 64 len = 0; 65 printf("\n"); 66 } 67 printf("%%%02x", data[i]); 68 } 69 } 70 printf("\n"); 71 } 72 73 void 74 utf8dump(uint8_t *data, size_t datalen) 75 { 76 char *utf8 = NULL; 77 efi_char *ucs2; 78 79 /* 80 * NUL terminate the string. Not all strings need it, but some 81 * do and an extra NUL won't change what's printed. 82 */ 83 ucs2 = malloc(datalen + sizeof(efi_char)); 84 memcpy(ucs2, data, datalen); 85 ucs2[datalen / sizeof(efi_char)] = 0; 86 ucs2_to_utf8(ucs2, &utf8); 87 printf("%s\n", utf8); 88 free(utf8); 89 free(ucs2); 90 } 91 92 void 93 hexdump(uint8_t *data, size_t datalen) 94 { 95 size_t i; 96 97 for (i = 0; i < datalen; i++) { 98 if (i % 16 == 0) { 99 if (i != 0) 100 printf("\n"); 101 printf("%04x: ", (int)i); 102 } 103 printf("%02x ", data[i]); 104 } 105 printf("\n"); 106 } 107 108 void 109 bindump(uint8_t *data, size_t datalen) 110 { 111 write(1, data, datalen); 112 } 113 114 #define LOAD_OPTION_ACTIVE 1 115 116 #define SIZE(dp, edp) (size_t)((intptr_t)(void *)edp - (intptr_t)(void *)dp) 117 118 void 119 efi_print_load_option(uint8_t *data, size_t datalen, int Aflag, int bflag, int uflag) 120 { 121 char *dev, *relpath, *abspath; 122 uint8_t *ep = data + datalen; 123 uint8_t *walker = data; 124 uint32_t attr; 125 uint16_t fplen; 126 efi_char *descr; 127 efidp dp, edp; 128 char *str = NULL; 129 char buf[1024]; 130 int len; 131 void *opt; 132 int optlen; 133 int rv; 134 135 if (datalen < sizeof(attr) + sizeof(fplen) + sizeof(efi_char)) 136 return; 137 // First 4 bytes are attribute flags 138 attr = le32dec(walker); 139 walker += sizeof(attr); 140 // Next two bytes are length of the file paths 141 fplen = le16dec(walker); 142 walker += sizeof(fplen); 143 // Next we have a 0 terminated UCS2 string that we know to be aligned 144 descr = (efi_char *)(intptr_t)(void *)walker; 145 len = ucs2len(descr); // XXX need to sanity check that len < (datalen - (ep - walker) / 2) 146 walker += (len + 1) * sizeof(efi_char); 147 if (walker > ep) 148 return; 149 // Now we have fplen bytes worth of file path stuff 150 dp = (efidp)walker; 151 walker += fplen; 152 if (walker > ep) 153 return; 154 edp = (efidp)walker; 155 // Everything left is the binary option args 156 opt = walker; 157 optlen = ep - walker; 158 // We got to here, everything is good 159 printf("%c ", attr & LOAD_OPTION_ACTIVE ? '*' : ' '); 160 ucs2_to_utf8(descr, &str); 161 printf("%s", str); 162 free(str); 163 while (dp < edp && SIZE(dp, edp) > sizeof(efidp_header)) { 164 efidp_format_device_path(buf, sizeof(buf), dp, SIZE(dp, edp)); 165 rv = efivar_device_path_to_unix_path(dp, &dev, &relpath, &abspath); 166 dp = (efidp)((char *)dp + efidp_size(dp)); 167 printf(" %s\n", buf); 168 if (rv == 0) { 169 printf(" %*s:%s\n", len + (int)strlen(dev), dev, relpath); 170 free(dev); 171 free(relpath); 172 free(abspath); 173 } 174 } 175 if (optlen == 0) 176 return; 177 printf("Options: "); 178 if (Aflag) 179 asciidump(opt, optlen); 180 else if (bflag) 181 bindump(opt, optlen); 182 else if (uflag) 183 utf8dump(opt, optlen); 184 else 185 hexdump(opt, optlen); 186 } 187