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 #include <ctype.h>
28 #include <efivar.h>
29 #include <efivar-dp.h>
30 #include <err.h>
31 #include <errno.h>
32 #include <getopt.h>
33 #include <stddef.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <unistd.h>
38 #include "efiutil.h"
39 #include "efichar.h"
40 #include <efivar-dp.h>
41
42 /*
43 * Dump the data as ASCII data, which is a pretty
44 * printed form
45 */
46 void
asciidump(uint8_t * data,size_t datalen)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
utf8dump(uint8_t * data,size_t datalen)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
hexdump(uint8_t * data,size_t datalen)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
bindump(uint8_t * data,size_t datalen)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
efi_print_load_option(uint8_t * data,size_t datalen,int Aflag,int bflag,int uflag)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\n", str);
162 free(str);
163 if (fplen <= 4) {
164 printf("Empty path\n");
165 } else {
166 while (dp < edp && SIZE(dp, edp) > sizeof(efidp_header)) {
167 efidp_format_device_path(buf, sizeof(buf), dp, SIZE(dp, edp));
168 rv = efivar_device_path_to_unix_path(dp, &dev, &relpath, &abspath);
169 dp = (efidp)((char *)dp + efidp_size(dp));
170 printf(" %s\n", buf);
171 if (rv == 0) {
172 printf(" %*s:%s\n", len + (int)strlen(dev), dev, relpath);
173 free(dev);
174 free(relpath);
175 free(abspath);
176 }
177 }
178 }
179 if (optlen == 0)
180 return;
181 printf("Option:\n");
182 if (Aflag)
183 asciidump(opt, optlen);
184 else if (bflag)
185 bindump(opt, optlen);
186 else if (uflag)
187 utf8dump(opt, optlen);
188 else
189 hexdump(opt, optlen);
190 }
191