1 /*- 2 * Copyright (c) 2017 Netflix, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <ctype.h> 31 #include <efivar.h> 32 #include <efivar-dp.h> 33 #include <err.h> 34 #include <errno.h> 35 #include <getopt.h> 36 #include <stddef.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <string.h> 40 #include <unistd.h> 41 #include "efiutil.h" 42 #include "efichar.h" 43 #include <efivar-dp.h> 44 45 /* 46 * Dump the data as ASCII data, which is a pretty 47 * printed form 48 */ 49 void 50 asciidump(uint8_t *data, size_t datalen) 51 { 52 size_t i; 53 int len; 54 55 len = 0; 56 for (i = 0; i < datalen; i++) { 57 if (isprint(data[i])) { 58 len++; 59 if (len > 80) { 60 len = 0; 61 printf("\n"); 62 } 63 printf("%c", data[i]); 64 } else { 65 len +=3; 66 if (len > 80) { 67 len = 0; 68 printf("\n"); 69 } 70 printf("%%%02x", data[i]); 71 } 72 } 73 printf("\n"); 74 } 75 76 void 77 utf8dump(uint8_t *data, size_t datalen) 78 { 79 char *utf8 = NULL; 80 efi_char *ucs2; 81 82 /* 83 * NUL terminate the string. Not all strings need it, but some 84 * do and an extra NUL won't change what's printed. 85 */ 86 ucs2 = malloc(datalen + sizeof(efi_char)); 87 memcpy(ucs2, data, datalen); 88 ucs2[datalen / sizeof(efi_char)] = 0; 89 ucs2_to_utf8(ucs2, &utf8); 90 printf("%s\n", utf8); 91 free(utf8); 92 free(ucs2); 93 } 94 95 void 96 hexdump(uint8_t *data, size_t datalen) 97 { 98 size_t i; 99 100 for (i = 0; i < datalen; i++) { 101 if (i % 16 == 0) { 102 if (i != 0) 103 printf("\n"); 104 printf("%04x: ", (int)i); 105 } 106 printf("%02x ", data[i]); 107 } 108 printf("\n"); 109 } 110 111 void 112 bindump(uint8_t *data, size_t datalen) 113 { 114 write(1, data, datalen); 115 } 116 117 #define LOAD_OPTION_ACTIVE 1 118 119 void 120 efi_print_load_option(uint8_t *data, size_t datalen, int Aflag, int bflag, int uflag) 121 { 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; 133 134 if (datalen < sizeof(attr) + sizeof(fplen) + sizeof(efi_char)) 135 return; 136 // First 4 bytes are attribute flags 137 attr = le32dec(walker); 138 walker += sizeof(attr); 139 // Next two bytes are length of the file paths 140 fplen = le16dec(walker); 141 walker += sizeof(fplen); 142 // Next we have a 0 terminated UCS2 string that we know to be aligned 143 descr = (efi_char *)(intptr_t)(void *)walker; 144 len = ucs2len(descr); // XXX need to sanity check that len < (datalen - (ep - walker) / 2) 145 walker += (len + 1) * sizeof(efi_char); 146 if (walker > ep) 147 return; 148 // Now we have fplen bytes worth of file path stuff 149 dp = (efidp)walker; 150 walker += fplen; 151 if (walker > ep) 152 return; 153 edp = (efidp)walker; 154 // Everything left is the binary option args 155 opt = walker; 156 optlen = ep - walker; 157 // We got to here, everything is good 158 printf("%c ", attr & LOAD_OPTION_ACTIVE ? '*' : ' '); 159 ucs2_to_utf8(descr, &str); 160 printf("%s", str); 161 free(str); 162 while (dp < edp) { 163 efidp_format_device_path(buf, sizeof(buf), dp, 164 (intptr_t)(void *)edp - (intptr_t)(void *)dp); 165 dp = (efidp)((char *)dp + efidp_size(dp)); 166 printf(" %s\n", buf); 167 } 168 if (optlen == 0) 169 return; 170 printf("Options: "); 171 if (Aflag) 172 asciidump(opt, optlen); 173 else if (bflag) 174 bindump(opt, optlen); 175 else if (uflag) 176 utf8dump(opt, optlen); 177 else 178 hexdump(opt, optlen); 179 } 180