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
asciidump(uint8_t * data,size_t datalen)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
utf8dump(uint8_t * data,size_t datalen)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
hexdump(uint8_t * data,size_t datalen)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
bindump(uint8_t * data,size_t datalen)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
efi_print_load_option(uint8_t * data,size_t datalen,int Aflag,int bflag,int uflag)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