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
30 #include <stand.h>
31 #include <string.h>
32 #include <sys/disklabel.h>
33 #include <sys/param.h>
34 #include <bootstrap.h>
35 #include <disk.h>
36 #include <libzfs.h>
37
38 #include <efi.h>
39 #include <efilib.h>
40
41 static int efi_parsedev(struct devdesc **, const char *, const char **);
42
43 /*
44 * Point (dev) at an allocated device specifier for the device matching the
45 * path in (devspec). If it contains an explicit device specification,
46 * use that. If not, use the default device.
47 */
48 int
efi_getdev(void ** vdev,const char * devspec,const char ** path)49 efi_getdev(void **vdev, const char *devspec, const char **path)
50 {
51 struct devdesc **dev = (struct devdesc **)vdev;
52 int rv;
53
54 /*
55 * If it looks like this is just a path and no device, then
56 * use the current device instead.
57 */
58 if (devspec == NULL || *devspec == '/' || !strchr(devspec, ':')) {
59 rv = efi_parsedev(dev, getenv("currdev"), NULL);
60 if (rv == 0 && path != NULL)
61 *path = devspec;
62 return (rv);
63 }
64
65 /* Parse the device name off the beginning of the devspec. */
66 return (efi_parsedev(dev, devspec, path));
67 }
68
69 /*
70 * Point (dev) at an allocated device specifier matching the string version
71 * at the beginning of (devspec). Return a pointer to the remaining
72 * text in (path).
73 *
74 * In all cases, the beginning of (devspec) is compared to the names
75 * of known devices in the device switch, and then any following text
76 * is parsed according to the rules applied to the device type.
77 *
78 * For disk-type devices, the syntax is:
79 *
80 * fs<unit>:
81 */
82 static int
efi_parsedev(struct devdesc ** dev,const char * devspec,const char ** path)83 efi_parsedev(struct devdesc **dev, const char *devspec, const char **path)
84 {
85 struct devdesc *idev;
86 struct devsw *dv;
87 int i, unit, err;
88 char *cp;
89 const char *np;
90
91 /* minimum length check */
92 if (strlen(devspec) < 2)
93 return (EINVAL);
94
95 /* look for a device that matches */
96 for (i = 0; devsw[i] != NULL; i++) {
97 dv = devsw[i];
98 if (strncmp(devspec, dv->dv_name, strlen(dv->dv_name)) == 0)
99 break;
100 }
101 if (devsw[i] == NULL)
102 return (ENOENT);
103
104 np = devspec + strlen(dv->dv_name);
105 idev = NULL;
106 err = 0;
107
108 switch (dv->dv_type) {
109 case DEVT_NONE:
110 break;
111
112 case DEVT_DISK:
113 idev = malloc(sizeof (struct disk_devdesc));
114 if (idev == NULL)
115 return (ENOMEM);
116
117 err = disk_parsedev((struct disk_devdesc *)idev, np, path);
118 if (err != 0)
119 goto fail;
120 break;
121
122 case DEVT_ZFS:
123 idev = malloc(sizeof (struct zfs_devdesc));
124 if (idev == NULL)
125 return (ENOMEM);
126
127 err = zfs_parsedev((struct zfs_devdesc *)idev, np, path);
128 if (err != 0)
129 goto fail;
130 break;
131
132 default:
133 idev = malloc(sizeof (struct devdesc));
134 if (idev == NULL)
135 return (ENOMEM);
136
137 unit = 0;
138 cp = (char *)np;
139
140 if (*np != '\0' && *np != ':') {
141 /* get unit number if present */
142 errno = 0;
143 unit = strtol(np, &cp, 0);
144 if (errno != 0 || cp == np) {
145 err = EUNIT;
146 goto fail;
147 }
148 }
149 if (*cp != '\0' && *cp != ':') {
150 err = EINVAL;
151 goto fail;
152 }
153
154 idev->d_unit = unit;
155 if (path != NULL)
156 *path = (*cp == '\0') ? cp : cp + 1;
157 break;
158 }
159
160 idev->d_dev = dv;
161
162 if (dev != NULL)
163 *dev = idev;
164 else
165 free(idev);
166 return (0);
167
168 fail:
169 free(idev);
170 return (err);
171 }
172
173 char *
efi_fmtdev(void * vdev)174 efi_fmtdev(void *vdev)
175 {
176 struct devdesc *dev = (struct devdesc *)vdev;
177 static char buf[SPECNAMELEN + 1];
178
179 switch (dev->d_dev->dv_type) {
180 case DEVT_NONE:
181 strlcpy(buf, "(no device)", sizeof (buf));
182 break;
183
184 case DEVT_DISK:
185 return (disk_fmtdev(vdev));
186
187 case DEVT_ZFS:
188 return (zfs_fmtdev(dev));
189
190 default:
191 snprintf(buf, sizeof (buf), "%s%d:", dev->d_dev->dv_name,
192 dev->d_unit);
193 break;
194 }
195
196 return (buf);
197 }
198
199 /*
200 * Set currdev to suit the value being supplied in (value)
201 */
202 int
efi_setcurrdev(struct env_var * ev,int flags,const void * value)203 efi_setcurrdev(struct env_var *ev, int flags, const void *value)
204 {
205 struct devdesc *ncurr;
206 int rv;
207
208 rv = efi_parsedev(&ncurr, value, NULL);
209 if (rv != 0)
210 return (rv);
211
212 free(ncurr);
213 env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
214 return (0);
215 }
216