1 /*
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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
29 #include <stand.h>
30 #include <string.h>
31 #include <sys/param.h>
32 #include "bootstrap.h"
33 #include "disk.h"
34 #include "libi386.h"
35 #include "libzfs.h"
36
37 static int i386_parsedev(struct i386_devdesc **, const char *, const char **);
38
39 /*
40 * Point dev at an allocated device specifier for the device matching the
41 * path in devspec. If it contains an explicit device specification,
42 * use that. If not, use the default device.
43 */
44 int
i386_getdev(void ** vdev,const char * devspec,const char ** path)45 i386_getdev(void **vdev, const char *devspec, const char **path)
46 {
47 struct i386_devdesc **dev = (struct i386_devdesc **)vdev;
48 int rv;
49
50 /*
51 * If it looks like this is just a path and no
52 * device, go with the current device.
53 */
54 if ((devspec == NULL) ||
55 (devspec[0] == '/') || (strchr(devspec, ':') == NULL)) {
56
57 rv = i386_parsedev(dev, getenv("currdev"), NULL);
58 if (rv == 0 && path != NULL)
59 *path = devspec;
60 return (rv);
61 }
62
63 /*
64 * Try to parse the device name off the beginning of the devspec
65 */
66 return (i386_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 * disk<unit>[s<slice>][<partition>]:
81 *
82 */
83 static int
i386_parsedev(struct i386_devdesc ** dev,const char * devspec,const char ** path)84 i386_parsedev(struct i386_devdesc **dev, const char *devspec, const char **path)
85 {
86 struct i386_devdesc *idev;
87 struct devsw *dv;
88 int i, unit, err;
89 char *cp;
90 const char *np;
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, dv = NULL; devsw[i] != NULL; i++) {
98 dv = devsw[i];
99 if (strncmp(devspec, dv->dv_name, strlen(dv->dv_name)) == 0)
100 break;
101 }
102 if (devsw[i] == NULL)
103 return (ENOENT);
104
105 np = devspec + strlen(dv->dv_name);
106 idev = NULL;
107 err = 0;
108
109 switch (dv->dv_type) {
110 case DEVT_NONE:
111 break;
112
113 case DEVT_DISK:
114 idev = malloc(sizeof (struct i386_devdesc));
115 if (idev == NULL)
116 return (ENOMEM);
117
118 err = disk_parsedev((struct disk_devdesc *)idev, np, path);
119 if (err != 0)
120 goto fail;
121 break;
122
123 case DEVT_ZFS:
124 idev = malloc(sizeof (struct zfs_devdesc));
125 if (idev == NULL)
126 return (ENOMEM);
127
128 err = zfs_parsedev((struct zfs_devdesc *)idev, np, path);
129 if (err != 0)
130 goto fail;
131 break;
132
133 default:
134 idev = malloc(sizeof (struct devdesc));
135 if (idev == NULL)
136 return (ENOMEM);
137
138 unit = 0;
139 cp = (char *)np;
140
141 if (*np && (*np != ':')) {
142 /* get unit number if present */
143 unit = strtol(np, &cp, 0);
144 if (cp == np) {
145 err = EUNIT;
146 goto fail;
147 }
148 }
149 if (*cp && (*cp != ':')) {
150 err = EINVAL;
151 goto fail;
152 }
153
154 idev->dd.d_unit = unit;
155 if (path != NULL)
156 *path = (*cp == '\0') ? cp : cp + 1;
157 break;
158 }
159
160 idev->dd.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
174 char *
i386_fmtdev(void * vdev)175 i386_fmtdev(void *vdev)
176 {
177 struct i386_devdesc *dev = (struct i386_devdesc *)vdev;
178 static char buf[SPECNAMELEN + 1];
179
180 switch (dev->dd.d_dev->dv_type) {
181 case DEVT_NONE:
182 strlcpy(buf, "(no device)", sizeof (buf));
183 break;
184
185 case DEVT_DISK:
186 return (disk_fmtdev(vdev));
187
188 case DEVT_ZFS:
189 return (zfs_fmtdev(vdev));
190
191 default:
192 snprintf(buf, sizeof (buf), "%s%d:", dev->dd.d_dev->dv_name,
193 dev->dd.d_unit);
194 break;
195 }
196 return (buf);
197 }
198
199
200 /*
201 * Set currdev to suit the value being supplied in (value)
202 */
203 int
i386_setcurrdev(struct env_var * ev,int flags,const void * value)204 i386_setcurrdev(struct env_var *ev, int flags, const void *value)
205 {
206 struct i386_devdesc *ncurr;
207 int rv;
208
209 if ((rv = i386_parsedev(&ncurr, value, NULL)) != 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