1 /*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * Copyright (c) 2006 Marcel Moolenaar
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD: stable/10/sys/boot/efi/loader/devicename.c 297555 2016-04-04 12:21:04Z marius $");
30
31 #include <stand.h>
32 #include <string.h>
33 #include <sys/disklabel.h>
34 #include <sys/param.h>
35 #include <bootstrap.h>
36 #ifdef EFI_ZFS_BOOT
37 #include <libzfs.h>
38 #endif
39
40 #include <efi.h>
41 #include <efilib.h>
42
43 #include "loader_efi.h"
44
45 static int efi_parsedev(struct devdesc **, const char *, const char **);
46
47 /*
48 * Point (dev) at an allocated device specifier for the device matching the
49 * path in (devspec). If it contains an explicit device specification,
50 * use that. If not, use the default device.
51 */
52 int
efi_getdev(void ** vdev,const char * devspec,const char ** path)53 efi_getdev(void **vdev, const char *devspec, const char **path)
54 {
55 struct devdesc **dev = (struct devdesc **)vdev;
56 int rv;
57
58 /*
59 * If it looks like this is just a path and no device, then
60 * use the current device instead.
61 */
62 if (devspec == NULL || *devspec == '/' || !strchr(devspec, ':')) {
63 rv = efi_parsedev(dev, getenv("currdev"), NULL);
64 if (rv == 0 && path != NULL)
65 *path = devspec;
66 return (rv);
67 }
68
69 /* Parse the device name off the beginning of the devspec. */
70 return (efi_parsedev(dev, devspec, path));
71 }
72
73 /*
74 * Point (dev) at an allocated device specifier matching the string version
75 * at the beginning of (devspec). Return a pointer to the remaining
76 * text in (path).
77 *
78 * In all cases, the beginning of (devspec) is compared to the names
79 * of known devices in the device switch, and then any following text
80 * is parsed according to the rules applied to the device type.
81 *
82 * For disk-type devices, the syntax is:
83 *
84 * fs<unit>:
85 */
86 static int
efi_parsedev(struct devdesc ** dev,const char * devspec,const char ** path)87 efi_parsedev(struct devdesc **dev, const char *devspec, const char **path)
88 {
89 struct devdesc *idev;
90 struct devsw *dv;
91 char *cp;
92 const char *np;
93 int i;
94
95 /* minimum length check */
96 if (strlen(devspec) < 2)
97 return (EINVAL);
98
99 /* look for a device that matches */
100 for (i = 0; devsw[i] != NULL; i++) {
101 dv = devsw[i];
102 if (!strncmp(devspec, dv->dv_name, strlen(dv->dv_name)))
103 break;
104 }
105 if (devsw[i] == NULL)
106 return (ENOENT);
107
108 np = devspec + strlen(dv->dv_name);
109
110 #ifdef EFI_ZFS_BOOT
111 if (dv->dv_type == DEVT_ZFS) {
112 int err;
113
114 idev = malloc(sizeof(struct zfs_devdesc));
115 if (idev == NULL)
116 return (ENOMEM);
117
118 err = zfs_parsedev((struct zfs_devdesc*)idev, np, path);
119 if (err != 0) {
120 free(idev);
121 return (err);
122 }
123 *dev = idev;
124 cp = strchr(np + 1, ':');
125 } else
126 #endif
127 {
128 idev = malloc(sizeof(struct devdesc));
129 if (idev == NULL)
130 return (ENOMEM);
131
132 idev->d_dev = dv;
133 idev->d_type = dv->dv_type;
134 idev->d_unit = -1;
135 if (*np != '\0' && *np != ':') {
136 idev->d_unit = strtol(np, &cp, 0);
137 if (cp == np) {
138 idev->d_unit = -1;
139 free(idev);
140 return (EUNIT);
141 }
142 }
143 }
144
145 if (*cp != '\0' && *cp != ':') {
146 free(idev);
147 return (EINVAL);
148 }
149
150 if (path != NULL)
151 *path = (*cp == 0) ? cp : cp + 1;
152 if (dev != NULL)
153 *dev = idev;
154 else
155 free(idev);
156 return (0);
157 }
158
159 char *
efi_fmtdev(void * vdev)160 efi_fmtdev(void *vdev)
161 {
162 struct devdesc *dev = (struct devdesc *)vdev;
163 static char buf[SPECNAMELEN + 1];
164
165 switch(dev->d_type) {
166 #ifdef EFI_ZFS_BOOT
167 case DEVT_ZFS:
168 return (zfs_fmtdev(dev));
169 #endif
170 case DEVT_NONE:
171 strcpy(buf, "(no device)");
172 break;
173
174 default:
175 sprintf(buf, "%s%d:", dev->d_dev->dv_name, dev->d_unit);
176 break;
177 }
178
179 return (buf);
180 }
181
182 /*
183 * Set currdev to suit the value being supplied in (value)
184 */
185 int
efi_setcurrdev(struct env_var * ev,int flags,const void * value)186 efi_setcurrdev(struct env_var *ev, int flags, const void *value)
187 {
188 struct devdesc *ncurr;
189 int rv;
190
191 rv = efi_parsedev(&ncurr, value, NULL);
192 if (rv != 0)
193 return (rv);
194
195 free(ncurr);
196 env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
197 return (0);
198 }
199