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: head/sys/boot/efi/loader/devicename.c 294068 2016-01-15 02:33:47Z smh $");
30
31 #include <stand.h>
32 #include <string.h>
33 #include <sys/disklabel.h>
34 #include <sys/param.h>
35 #include <bootstrap.h>
36
37 #include <efi.h>
38 #include <efilib.h>
39
40 #include "loader_efi.h"
41
42 static int efi_parsedev(struct efi_devdesc **, const char *, const char **);
43
44 /*
45 * Point (dev) at an allocated device specifier for the device matching the
46 * path in (devspec). If it contains an explicit device specification,
47 * use that. If not, use the default device.
48 */
49 int
efi_getdev(void ** vdev,const char * devspec,const char ** path)50 efi_getdev(void **vdev, const char *devspec, const char **path)
51 {
52 struct efi_devdesc **dev = (struct efi_devdesc **)vdev;
53 int rv;
54
55 /*
56 * If it looks like this is just a path and no device, then
57 * use the current device instead.
58 */
59 if (devspec == NULL || *devspec == '/' || !strchr(devspec, ':')) {
60 rv = efi_parsedev(dev, getenv("currdev"), NULL);
61 if (rv == 0 && path != NULL)
62 *path = devspec;
63 return (rv);
64 }
65
66 /* Parse the device name off the beginning of the devspec. */
67 return (efi_parsedev(dev, devspec, path));
68 }
69
70 /*
71 * Point (dev) at an allocated device specifier matching the string version
72 * at the beginning of (devspec). Return a pointer to the remaining
73 * text in (path).
74 *
75 * In all cases, the beginning of (devspec) is compared to the names
76 * of known devices in the device switch, and then any following text
77 * is parsed according to the rules applied to the device type.
78 *
79 * For disk-type devices, the syntax is:
80 *
81 * fs<unit>:
82 */
83 static int
efi_parsedev(struct efi_devdesc ** dev,const char * devspec,const char ** path)84 efi_parsedev(struct efi_devdesc **dev, const char *devspec, const char **path)
85 {
86 struct efi_devdesc *idev;
87 struct devsw *dv;
88 char *cp;
89 const char *np;
90 int i;
91
92 /* minimum length check */
93 if (strlen(devspec) < 2)
94 return (EINVAL);
95
96 /* look for a device that matches */
97 for (i = 0; devsw[i] != NULL; i++) {
98 dv = devsw[i];
99 if (!strncmp(devspec, dv->dv_name, strlen(dv->dv_name)))
100 break;
101 }
102 if (devsw[i] == NULL)
103 return (ENOENT);
104
105 np = devspec + strlen(dv->dv_name);
106
107 {
108 idev = malloc(sizeof(struct efi_devdesc));
109 if (idev == NULL)
110 return (ENOMEM);
111
112 idev->d_dev = dv;
113 idev->d_type = dv->dv_type;
114 idev->d_kind.efidisk.unit = -1;
115 if (*np != '\0' && *np != ':') {
116 idev->d_kind.efidisk.unit = strtol(np, &cp, 0);
117 if (cp == np) {
118 idev->d_kind.efidisk.unit = -1;
119 free(idev);
120 return (EUNIT);
121 }
122 }
123 }
124
125 if (*cp != '\0' && *cp != ':') {
126 free(idev);
127 return (EINVAL);
128 }
129
130 if (path != NULL)
131 *path = (*cp == 0) ? cp : cp + 1;
132 if (dev != NULL)
133 *dev = idev;
134 else
135 free(idev);
136 return (0);
137 }
138
139 char *
efi_fmtdev(void * vdev)140 efi_fmtdev(void *vdev)
141 {
142 struct efi_devdesc *dev = (struct efi_devdesc *)vdev;
143 static char buf[SPECNAMELEN + 1];
144
145 switch(dev->d_type) {
146 case DEVT_NONE:
147 strcpy(buf, "(no device)");
148 break;
149
150 default:
151 sprintf(buf, "%s%d:", dev->d_dev->dv_name,
152 dev->d_kind.efidisk.unit);
153 break;
154 }
155
156 return (buf);
157 }
158
159 /*
160 * Set currdev to suit the value being supplied in (value)
161 */
162 int
efi_setcurrdev(struct env_var * ev,int flags,const void * value)163 efi_setcurrdev(struct env_var *ev, int flags, const void *value)
164 {
165 struct efi_devdesc *ncurr;
166 int rv;
167
168 rv = efi_parsedev(&ncurr, value, NULL);
169 if (rv != 0)
170 return (rv);
171
172 free(ncurr);
173 env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
174 return (0);
175 }
176