xref: /freebsd/usr.sbin/efidp/efidp.c (revision cc426dd31990b8b50b210efc450e404596548ca1)
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 <getopt.h>
36 #include <stddef.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <string.h>
40 #include <unistd.h>
41 
42 #define MAXSIZE 65536	/* Everyting will be smaller than this, most 1000x smaller */
43 
44 /* options descriptor */
45 static struct option longopts[] = {
46 	{ "to-unix",		no_argument,		NULL,	'u' },
47 	{ "to-efi",		no_argument,		NULL,	'e' },
48 	{ "format",		no_argument,		NULL,	'f' },
49 	{ "parse",		no_argument,		NULL,	'p' },
50 	{ NULL,			0,			NULL,	0 }
51 };
52 
53 
54 static int flag_format, flag_parse, flag_unix, flag_efi;
55 
56 static void
57 usage(void)
58 {
59 
60 	errx(1, "efidp [-efpu]");
61 }
62 
63 static ssize_t
64 read_file(int fd, void **rv)
65 {
66 	uint8_t *retval;
67 	size_t len;
68 	off_t off;
69 	ssize_t red;
70 
71 	len = MAXSIZE;
72 	off = 0;
73 	retval = malloc(len);
74 	do {
75 		red = read(fd, retval + off, len - off);
76 		if (red == 0)
77 			break;
78 		off += red;
79 		if (off == (off_t)len)
80 			break;
81 	} while (1);
82 	*rv = retval;
83 
84 	return off;
85 }
86 
87 static void
88 parse_args(int argc, char **argv)
89 {
90 	int ch;
91 
92 	while ((ch = getopt_long(argc, argv, "efpu",
93 		    longopts, NULL)) != -1) {
94 		switch (ch) {
95 		case 'e':
96 			flag_efi++;
97 			break;
98 		case 'f':
99 			flag_format++;
100 			break;
101 		case 'p':
102 			flag_parse++;
103 			break;
104 		case 'u':
105 			flag_unix++;
106 			break;
107 		default:
108 			usage();
109 		}
110 	}
111 	argc -= optind;
112 	argv += optind;
113 
114 	if (argc >= 1)
115 		usage();
116 
117 	if (flag_parse + flag_format + flag_efi + flag_unix != 1) {
118 		warnx("Can only use one of -p (--parse), "
119 		    "and -f (--format)");
120 		usage();
121 	}
122 }
123 
124 static char *
125 trim(char *s)
126 {
127 	char *t;
128 
129 	while (isspace(*s))
130 		s++;
131 	t = s + strlen(s) - 1;
132 	while (t > s && isspace(*t))
133 		*t-- = '\0';
134 	return s;
135 }
136 
137 static void
138 unix_to_efi(void)
139 {
140 	char buffer[MAXSIZE];
141 	char efi[MAXSIZE];
142 	efidp dp;
143 	char *walker;
144 	int rv;
145 
146 	dp = NULL;
147 	while (fgets(buffer, sizeof(buffer), stdin)) {
148 		walker= trim(buffer);
149 		free(dp);
150 		dp = NULL;
151 		rv = efivar_unix_path_to_device_path(walker, &dp);
152 		if (rv != 0 || dp == NULL) {
153 			errno = rv;
154 			warn("Can't convert '%s' to efi", walker);
155 			continue;
156 		}
157 		if (efidp_format_device_path(efi, sizeof(efi),
158 		    dp, efidp_size(dp)) < 0) {
159 			warnx("Can't format dp for '%s'", walker);
160 			continue;
161 		}
162 		printf("%s\n", efi);
163 	}
164 	free(dp);
165 }
166 
167 static void
168 efi_to_unix(void)
169 {
170 	char buffer[MAXSIZE];
171 	char dpbuf[MAXSIZE];
172 	efidp dp;
173 	size_t dplen;
174 	char *walker, *dev, *relpath, *abspath;
175 	int rv;
176 
177 	dp = (efidp)dpbuf;
178 	while (fgets(buffer, sizeof(buffer), stdin)) {
179 		walker= trim(buffer);
180 		dplen = efidp_parse_device_path(walker, dp, sizeof(dpbuf));
181 		rv = efivar_device_path_to_unix_path(dp, &dev, &relpath, &abspath);
182 		if (rv == 0)
183 			printf("%s:%s %s\n", dev, relpath, abspath);
184 		else {
185 			errno = rv;
186 			warn("Can't convert '%s' to unix", walker);
187 		}
188 	}
189 }
190 
191 static void
192 format(void)
193 {
194 	char buffer[MAXSIZE];
195 	ssize_t fmtlen;
196 	ssize_t len;
197 	void *data;
198 	size_t dplen;
199 	const_efidp dp;
200 
201 	len = read_file(STDIN_FILENO, &data);
202 	if (len == -1)
203 		err(1, "read");
204 	dp = (const_efidp)data;
205 	while (len > 0) {
206 		dplen = efidp_size(dp);
207 		fmtlen = efidp_format_device_path(buffer, sizeof(buffer),
208 		    dp, dplen);
209 		if (fmtlen > 0)
210 			printf("%s\n", buffer);
211 		len -= dplen;
212 		dp = (const_efidp)((const char *)dp + dplen);
213 	}
214 	free(data);
215 }
216 
217 static void
218 parse(void)
219 {
220 	char buffer[MAXSIZE];
221 	efidp dp;
222 	ssize_t dplen;
223 	char *walker;
224 
225 	dplen = MAXSIZE;
226 	dp = malloc(dplen);
227 	if (dp == NULL)
228 		errx(1, "Can't allocate memory.");
229 	while (fgets(buffer, sizeof(buffer), stdin)) {
230 		walker= trim(buffer);
231 		dplen = efidp_parse_device_path(walker, dp, dplen);
232 		if (dplen == -1)
233 			errx(1, "Can't parse %s", walker);
234 		write(STDOUT_FILENO, dp, dplen);
235 	}
236 	free(dp);
237 }
238 
239 int
240 main(int argc, char **argv)
241 {
242 
243 	parse_args(argc, argv);
244 	if (flag_unix)
245 		efi_to_unix();
246 	else if (flag_efi)
247 		unix_to_efi();
248 	else if (flag_format)
249 		format();
250 	else if (flag_parse)
251 		parse();
252 }
253