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1 /*-
2  * Copyright (c) 2016 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 <fcntl.h>
36 #include <getopt.h>
37 #include <stddef.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <unistd.h>
42 #include "efiutil.h"
43 #include "efichar.h"
44
45 /* options descriptor */
46 static struct option longopts[] = {
47         { "append",             no_argument,            NULL,   'a' },
48         { "ascii",              no_argument,            NULL,   'A' },
49         { "attributes",         required_argument,      NULL,   't' },
50         { "binary",             no_argument,            NULL,   'b' },
51         { "delete",             no_argument,            NULL,   'D' },
52         { "device",             no_argument,            NULL,   'd' },
53         { "device-path",        no_argument,            NULL,   'd' },
54         { "fromfile",           required_argument,      NULL,   'f' },
55         { "guid",               no_argument,            NULL,   'g' },
56         { "hex",                no_argument,            NULL,   'H' },
57         { "list-guids",         no_argument,            NULL,   'L' },
58         { "list",               no_argument,            NULL,   'l' },
59         { "load-option",        no_argument,            NULL,   'O' },
60         { "name",               required_argument,      NULL,   'n' },
61         { "no-name",            no_argument,            NULL,   'N' },
62         { "print",              no_argument,            NULL,   'p' },
63         { "print-decimal",      no_argument,            NULL,   'd' },
64         { "raw-guid",           no_argument,            NULL,   'R' },
65         { "utf8",               no_argument,            NULL,   'u' },
66         { "write",              no_argument,            NULL,   'w' },
67         { NULL,                 0,                      NULL,   0 }
68 };
69
70
71 static int aflag, Aflag, bflag, dflag, Dflag, gflag, Hflag, Nflag,
72         lflag, Lflag, Rflag, wflag, pflag, uflag, load_opt_flag;
73 static char *varname;
74 static char *fromfile;
75 static u_long attrib = EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS;
76
77 static void
78 usage(void)
79 {
80
81         errx(1, "efivar [-abdDHlLNpRtuw] [-n name] [-f file] [--append] [--ascii]\n"
82             "\t[--attributes] [--binary] [--delete] [--fromfile file] [--hex]\n"
83             "\t[--list-guids] [--list] [--load-option] [--name name] [--no-name]\n"
84             "\t[--print] [--print-decimal] [--raw-guid] [--utf8] [--write]\n"
85             "\tname[=value]");
86 }
87
88 static void
89 breakdown_name(char *name, efi_guid_t *guid, char **vname)
90 {
91         char *cp;
92
93         cp = strrchr(name, '-');
94         if (cp == NULL)
95                 errx(1, "Invalid name: %s", name);
96         *vname = cp + 1;
97         *cp = '\0';
98         if (efi_name_to_guid(name, guid) < 0)
99                 errx(1, "Invalid guid %s", name);
100 }
101
102 static uint8_t *
103 get_value(char *val, size_t *datalen)
104 {
105         static char buffer[16*1024];
106
107         if (val != NULL) {
108                 *datalen = strlen(val);
109                 return ((uint8_t *)val);
110         }
111         /* Read from stdin */
112         *datalen = sizeof(buffer);
113         *datalen = read(0, buffer, *datalen);
114         return ((uint8_t *)buffer);
115 }
116
117 static void
118 append_variable(char *name, char *val)
119 {
120         char *vname;
121         efi_guid_t guid;
122         size_t datalen;
123         uint8_t *data;
124
125         breakdown_name(name, &guid, &vname);
126         data = get_value(val, &datalen);
127         if (efi_append_variable(guid, vname, data, datalen, attrib) < 0)
128                 err(1, "efi_append_variable");
129 }
130
131 static void
132 delete_variable(char *name)
133 {
134         char *vname;
135         efi_guid_t guid;
136
137         breakdown_name(name, &guid, &vname);
138         if (efi_del_variable(guid, vname) < 0)
139                 err(1, "efi_del_variable");
140 }
141
142 static void
143 write_variable(char *name, char *val)
144 {
145         char *vname;
146         efi_guid_t guid;
147         size_t datalen;
148         uint8_t *data;
149
150         breakdown_name(name, &guid, &vname);
151         data = get_value(val, &datalen);
152         if (efi_set_variable(guid, vname, data, datalen, attrib) < 0)
153                 err(1, "efi_set_variable");
154 }
155
156 static void
157 devpath_dump(uint8_t *data, size_t datalen)
158 {
159         char buffer[1024];
160
161         efidp_format_device_path(buffer, sizeof(buffer),
162             (const_efidp)data, datalen);
163         if (!Nflag)
164                 printf(": ");
165         printf("%s\n", buffer);
166 }
167
168 static void
169 pretty_guid(efi_guid_t *guid, char **gname)
170 {
171         char *pretty = NULL;
172
173         if (gflag)
174                 efi_guid_to_name(guid, &pretty);
175
176         if (pretty == NULL)
177                 efi_guid_to_str(guid, gname);
178         else
179                 *gname = pretty;
180 }
181
182 static void
183 print_var(efi_guid_t *guid, char *name)
184 {
185         uint32_t att;
186         uint8_t *data;
187         size_t datalen;
188         char *gname = NULL;
189         int rv;
190
191         if (guid)
192                 pretty_guid(guid, &gname);
193         if (pflag || fromfile) {
194                 if (fromfile) {
195                         int fd;
196
197                         fd = open(fromfile, O_RDONLY);
198                         if (fd < 0)
199                                 err(1, "open %s", fromfile);
200                         data = malloc(64 * 1024);
201                         if (data == NULL)
202                                 err(1, "malloc");
203                         datalen = read(fd, data, 64 * 1024);
204                         if (datalen <= 0)
205                                 err(1, "read");
206                         close(fd);
207                 } else {
208                         rv = efi_get_variable(*guid, name, &data, &datalen, &att);
209                         if (rv < 0)
210                                 err(1, "fetching %s-%s", gname, name);
211                 }
212
213
214                 if (!Nflag)
215                         printf("%s-%s\n", gname, name);
216                 if (load_opt_flag)
217                         efi_print_load_option(data, datalen, Aflag, bflag, uflag);
218                 else if (Aflag)
219                         asciidump(data, datalen);
220                 else if (uflag)
221                         utf8dump(data, datalen);
222                 else if (bflag)
223                         bindump(data, datalen);
224                 else if (dflag)
225                         devpath_dump(data, datalen);
226                 else
227                         hexdump(data, datalen);
228         } else {
229                 printf("%s-%s", gname, name);
230         }
231         free(gname);
232         if (!Nflag)
233                 printf("\n");
234 }
235
236 static void
237 print_variable(char *name)
238 {
239         char *vname;
240         efi_guid_t guid;
241
242         breakdown_name(name, &guid, &vname);
243         print_var(&guid, vname);
244 }
245
246 static void
247 print_variables(void)
248 {
249         int rv;
250         char *name = NULL;
251         efi_guid_t *guid = NULL;
252
253         while ((rv = efi_get_next_variable_name(&guid, &name)) > 0)
254                 print_var(guid, name);
255
256         if (rv < 0)
257                 err(1, "Error listing names");
258 }
259
260 static void
261 print_known_guid(void)
262 {
263         struct uuid_table *tbl;
264         int i, n;
265
266         n = efi_known_guid(&tbl);
267         for (i = 0; i < n; i++)
268                 printf("%s %s\n", tbl[i].uuid_str, tbl[i].name);
269 }
270
271 static void
272 parse_args(int argc, char **argv)
273 {
274         int ch, i;
275
276         while ((ch = getopt_long(argc, argv, "aAbdDf:gHlLNn:OpRt:uw",
277                     longopts, NULL)) != -1) {
278                 switch (ch) {
279                 case 'a':
280                         aflag++;
281                         break;
282                 case 'A':
283                         Aflag++;
284                         break;
285                 case 'b':
286                         bflag++;
287                         break;
288                 case 'd':
289                         dflag++;
290                         break;
291                 case 'D':
292                         Dflag++;
293                         break;
294                 case 'g':
295                         gflag++;
296                         break;
297                 case 'H':
298                         Hflag++;
299                         break;
300                 case 'l':
301                         lflag++;
302                         break;
303                 case 'L':
304                         Lflag++;
305                         break;
306                 case 'n':
307                         varname = optarg;
308                         break;
309                 case 'N':
310                         Nflag++;
311                         break;
312                 case 'O':
313                         load_opt_flag++;
314                         break;
315                 case 'p':
316                         pflag++;
317                         break;
318                 case 'R':
319                         Rflag++;
320                         break;
321                 case 't':
322                         attrib = strtoul(optarg, NULL, 16);
323                         break;
324                 case 'u':
325                         uflag++;
326                         break;
327                 case 'w':
328                         wflag++;
329                         break;
330                 case 'f':
331                         free(fromfile);
332                         fromfile = strdup(optarg);
333                         break;
334                 case 0:
335                         errx(1, "unknown or unimplemented option\n");
336                         break;
337                 default:
338                         usage();
339                 }
340         }
341         argc -= optind;
342         argv += optind;
343
344         if (argc == 1)
345                 varname = argv[0];
346
347         if (aflag + Dflag + wflag > 1) {
348                 warnx("Can only use one of -a (--append), "
349                     "-D (--delete) and -w (--write)");
350                 usage();
351         }
352
353         if (aflag + Dflag + wflag > 0 && varname == NULL) {
354                 warnx("Must specify a variable for -a (--append), "
355                     "-D (--delete) or -w (--write)");
356                 usage();
357         }
358
359         if (aflag)
360                 append_variable(varname, NULL);
361         else if (Dflag)
362                 delete_variable(varname);
363         else if (wflag)
364                 write_variable(varname, NULL);
365         else if (Lflag)
366                 print_known_guid();
367         else if (fromfile) {
368                 Nflag = 1;
369                 print_var(NULL, NULL);
370         } else if (varname) {
371                 pflag++;
372                 print_variable(varname);
373         } else if (argc > 0) {
374                 pflag++;
375                 for (i = 0; i < argc; i++)
376                         print_variable(argv[i]);
377         } else
378                 print_variables();
379 }
380
381 int
382 main(int argc, char **argv)
383 {
384
385         parse_args(argc, argv);
386 }