1/*-
2 * Copyright (c) 2016 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
41#define MAXSIZE 65536	/* Everyting will be smaller than this, most 1000x smaller */
42
43/* options descriptor */
44static struct option longopts[] = {
45	{ "to-unix",		no_argument,		NULL,	'u' },
46	{ "to-efi",		no_argument,		NULL,	'e' },
47	{ "format",		no_argument,		NULL,	'f' },
48	{ "parse",		no_argument,		NULL,	'p' },
49	{ NULL,			0,			NULL,	0 }
50};
51
52
53static int flag_format, flag_parse, flag_unix, flag_efi;
54
55static void
56usage(void)
57{
58
59	errx(1, "efidp [-efpu]");
60}
61
62static ssize_t
63read_file(int fd, void **rv)
64{
65	uint8_t *retval;
66	size_t len;
67	off_t off;
68	ssize_t red;
69
70	len = MAXSIZE;
71	off = 0;
72	retval = malloc(len);
73	do {
74		red = read(fd, retval + off, len - off);
75		if (red == 0)
76			break;
77		off += red;
78		if (off == (off_t)len)
79			break;
80	} while (1);
81	*rv = retval;
82
83	return off;
84}
85
86static void
87parse_args(int argc, char **argv)
88{
89	int ch;
90
91	while ((ch = getopt_long(argc, argv, "efpu",
92		    longopts, NULL)) != -1) {
93		switch (ch) {
94		case 'e':
95			flag_efi++;
96			break;
97		case 'f':
98			flag_format++;
99			break;
100		case 'p':
101			flag_parse++;
102			break;
103		case 'u':
104			flag_unix++;
105			break;
106		default:
107			usage();
108		}
109	}
110	argc -= optind;
111	argv += optind;
112
113	if (argc >= 1)
114		usage();
115
116	if (flag_parse + flag_format + flag_efi + flag_unix != 1) {
117		warnx("Can only use one of -p (--parse), "
118		    "and -f (--format)");
119		usage();
120	}
121}
122
123static char *
124trim(char *s)
125{
126	char *t;
127
128	while (isspace(*s))
129		s++;
130	t = s + strlen(s) - 1;
131	while (t > s && isspace(*t))
132		*t-- = '\0';
133	return s;
134}
135
136static void
137unix_to_efi(void)
138{
139	char buffer[MAXSIZE];
140	char efi[MAXSIZE];
141	efidp dp;
142	char *walker;
143	int rv;
144
145	dp = NULL;
146	while (fgets(buffer, sizeof(buffer), stdin)) {
147		walker= trim(buffer);
148		free(dp);
149		dp = NULL;
150		rv = efivar_unix_path_to_device_path(walker, &dp);
151		if (rv != 0 || dp == NULL) {
152			errno = rv;
153			warn("Can't convert '%s' to efi", walker);
154			continue;
155		}
156		if (efidp_format_device_path(efi, sizeof(efi),
157		    dp, efidp_size(dp)) < 0) {
158			warnx("Can't format dp for '%s'", walker);
159			continue;
160		}
161		printf("%s\n", efi);
162	}
163	free(dp);
164}
165
166static void
167efi_to_unix(void)
168{
169	char buffer[MAXSIZE];
170	char dpbuf[MAXSIZE];
171	efidp dp;
172	size_t dplen;
173	char *walker, *dev, *relpath, *abspath;
174	int rv;
175
176	dp = (efidp)dpbuf;
177	while (fgets(buffer, sizeof(buffer), stdin)) {
178		walker= trim(buffer);
179		dplen = efidp_parse_device_path(walker, dp, sizeof(dpbuf));
180		rv = efivar_device_path_to_unix_path(dp, &dev, &relpath, &abspath);
181		if (rv == 0)
182			printf("%s:%s %s\n", dev, relpath, abspath);
183		else {
184			errno = rv;
185			warn("Can't convert '%s' to unix", walker);
186		}
187	}
188}
189
190static void
191format(void)
192{
193	char buffer[MAXSIZE];
194	ssize_t fmtlen;
195	ssize_t len;
196	void *data;
197	size_t dplen;
198	const_efidp dp;
199
200	len = read_file(STDIN_FILENO, &data);
201	if (len == -1)
202		err(1, "read");
203	dp = (const_efidp)data;
204	while (len > 0) {
205		dplen = efidp_size(dp);
206		fmtlen = efidp_format_device_path(buffer, sizeof(buffer),
207		    dp, dplen);
208		if (fmtlen > 0)
209			printf("%s\n", buffer);
210		len -= dplen;
211		dp = (const_efidp)((const char *)dp + dplen);
212	}
213	free(data);
214}
215
216static void
217parse(void)
218{
219	char buffer[MAXSIZE];
220	efidp dp;
221	ssize_t dplen;
222	char *walker;
223
224	dplen = MAXSIZE;
225	dp = malloc(dplen);
226	if (dp == NULL)
227		errx(1, "Can't allocate memory.");
228	while (fgets(buffer, sizeof(buffer), stdin)) {
229		walker= trim(buffer);
230		dplen = efidp_parse_device_path(walker, dp, dplen);
231		if (dplen == -1)
232			errx(1, "Can't parse %s", walker);
233		write(STDOUT_FILENO, dp, dplen);
234	}
235	free(dp);
236}
237
238int
239main(int argc, char **argv)
240{
241
242	parse_args(argc, argv);
243	if (flag_unix)
244		efi_to_unix();
245	else if (flag_efi)
246		unix_to_efi();
247	else if (flag_format)
248		format();
249	else if (flag_parse)
250		parse();
251}
252