1 /* $NetBSD: devicename.c,v 1.9 2016/08/15 09:00:52 maxv Exp $ */
2
3 /*-
4 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30
31 /* __FBSDID("$FreeBSD: src/sys/boot/efi/libefi/devicename.c,v 1.3 2004/01/04 23:28:16 obrien Exp $"); */
32
33 #include <lib/libsa/stand.h>
34 #include <lib/libsa/loadfile.h>
35 #include <lib/libkern/libkern.h>
36 #include <sys/disklabel.h>
37
38 #include <bootstrap.h>
39
40 #include <efi.h>
41 #include <efilib.h>
42 #include "efiboot.h"
43
44 static int efi_parsedev(struct efi_devdesc **dev, const char *devspec, const char **path);
45
46 /*
47 * Point (dev) at an allocated device specifier for the device matching the
48 * path in (devspec). If it contains an explicit device specification,
49 * use that. If not, use the default device.
50 */
51 int
efi_getdev(void ** vdev,const char * devspec,const char ** path)52 efi_getdev(void **vdev, const char *devspec, const char **path)
53 {
54 struct efi_devdesc **dev = (struct efi_devdesc **)vdev;
55 int rv;
56
57 /*
58 * If it looks like this is just a path and no
59 * device, go with the current device.
60 */
61 if ((devspec == NULL) ||
62 (devspec[0] == '/') ||
63 (strchr(devspec, ':') == NULL)) {
64
65 if (((rv = efi_parsedev(dev, getenv("currdev"), NULL)) == 0) &&
66 (path != NULL))
67 *path = devspec;
68 return(rv);
69 }
70
71 /*
72 * Try to parse the device name off the beginning of the devspec
73 */
74 return(efi_parsedev(dev, devspec, path));
75 }
76
77 /*
78 * Point (dev) at an allocated device specifier matching the string version
79 * at the beginning of (devspec). Return a pointer to the remaining
80 * text in (path).
81 *
82 * In all cases, the beginning of (devspec) is compared to the names
83 * of known devices in the device switch, and then any following text
84 * is parsed according to the rules applied to the device type.
85 *
86 * For disk-type devices, the syntax is:
87 *
88 * disk<unit>[s<slice>][<partition>]:
89 *
90 */
91 static int
efi_parsedev(struct efi_devdesc ** dev,const char * devspec,const char ** path)92 efi_parsedev(struct efi_devdesc **dev, const char *devspec, const char **path)
93 {
94 struct efi_devdesc *idev;
95 struct devsw *dv;
96 int dv_type;
97 int i, unit, slice, partition, err;
98 char *cp = NULL;
99 const char *np;
100
101 /* minimum length check */
102 if (strlen(devspec) < 2)
103 return(EINVAL);
104
105 /* look for a device that matches */
106 for (i = 0, dv = NULL; i < ndevs; i++) {
107 if (!strncmp(devspec, devsw[i].dv_name, strlen(devsw[i].dv_name))) {
108 dv = &devsw[i];
109 break;
110 }
111 }
112
113 if (dv == NULL)
114 return(ENOENT);
115 idev = alloc(sizeof(struct efi_devdesc));
116 err = 0;
117 np = (devspec + strlen(dv->dv_name));
118
119 dv_type = DEVT_NONE;
120 if (!strncmp("disk", dv->dv_name, 4)) dv_type = DEVT_DISK;
121 if (!strncmp("net", dv->dv_name, 3)) dv_type = DEVT_DISK;
122
123 switch(dv_type) {
124 case DEVT_NONE: /* XXX what to do here? Do we care? */
125 break;
126
127 case DEVT_DISK:
128 unit = -1;
129 slice = -1;
130 partition = -1;
131 if (*np && (*np != ':')) {
132 unit = strtol(np, &cp, 10); /* next comes the unit number */
133 if (cp == np) {
134 err = EUNIT;
135 goto fail;
136 }
137 if (*cp == 's') { /* got a slice number */
138 np = cp + 1;
139 slice = strtol(np, &cp, 10);
140 if (cp == np) {
141 err = EPART; /* XXX : NetBSD calls a FreeBSD SLICE, a Partition! */
142 goto fail;
143 }
144 }
145 if (*cp && (*cp != ':')) {
146 partition = *cp - 'a'; /* get a partition number */
147 if ((partition < 0) || (partition >= MAXPARTITIONS)) {
148 err = EPART;
149 goto fail;
150 }
151 cp++;
152 }
153 }
154 if (cp == NULL) {
155 err = EINVAL;
156 goto fail;
157 }
158 if (*cp && (*cp != ':')) {
159 err = EINVAL;
160 goto fail;
161 }
162
163 idev->d_kind.efidisk.unit = unit;
164 idev->d_kind.efidisk.slice = slice;
165 idev->d_kind.efidisk.partition = partition;
166
167 if (path != NULL)
168 *path = (*cp == 0) ? cp : cp + 1;
169 break;
170
171 case DEVT_NET:
172 unit = 0;
173
174 if (*np && (*np != ':')) {
175 unit = strtol(np, &cp, 0); /* get unit number if present */
176 if (cp == np) {
177 err = EUNIT;
178 goto fail;
179 }
180 }
181 if (cp == NULL) {
182 err = EINVAL;
183 goto fail;
184 }
185 if (*cp && (*cp != ':')) {
186 err = EINVAL;
187 goto fail;
188 }
189
190 idev->d_kind.netif.unit = unit;
191 if (path != NULL)
192 *path = (*cp == 0) ? cp : cp + 1;
193 break;
194
195 default:
196 err = EINVAL;
197 goto fail;
198 }
199 idev->d_dev = dv;
200 idev->d_type = dv_type;
201 if (dev == NULL) {
202 free(idev);
203 } else {
204 *dev = idev;
205 }
206 return(0);
207
208 fail:
209 free(idev);
210 return(err);
211 }
212
213
214 char *
efi_fmtdev(void * vdev)215 efi_fmtdev(void *vdev)
216 {
217 struct efi_devdesc *dev = (struct efi_devdesc *)vdev;
218 static char buf[128]; /* XXX device length constant? */
219 size_t len, buflen = sizeof(buf);
220
221 switch(dev->d_type) {
222 case DEVT_NONE:
223 strlcpy(buf, "(no device)", sizeof(buf));
224 break;
225
226 case DEVT_DISK:
227 len = snprintf(buf, buflen, "%s%d", dev->d_dev->dv_name, dev->d_kind.efidisk.unit);
228 if (len > buflen)
229 len = buflen;
230 if (dev->d_kind.efidisk.slice > 0) {
231 len += snprintf(buf + len, buflen - len, "s%d", dev->d_kind.efidisk.slice);
232 if (len > buflen)
233 len = buflen;
234 }
235 if (dev->d_kind.efidisk.partition >= 0) {
236 len += snprintf(buf + len, buflen - len, "%c", dev->d_kind.efidisk.partition + 'a');
237 if (len > buflen)
238 len = buflen;
239 }
240 strlcat(buf, ":", sizeof(buf) - len);
241 break;
242
243 case DEVT_NET:
244 snprintf(buf, buflen, "%s%d:", dev->d_dev->dv_name, dev->d_kind.netif.unit);
245 break;
246 }
247 return(buf);
248 }
249
250
251 /*
252 * Set currdev to suit the value being supplied in (value)
253 */
254 int
efi_setcurrdev(struct env_var * ev,int flags,void * value)255 efi_setcurrdev(struct env_var *ev, int flags, void *value)
256 {
257 struct efi_devdesc *ncurr;
258 int rv;
259
260 if ((rv = efi_parsedev(&ncurr, value, NULL)) != 0)
261 return(rv);
262 free(ncurr);
263 env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
264 return(0);
265 }
266
267