devicename.c revision 344377 
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__FBSDID("$FreeBSD: stable/11/stand/ofw/libofw/devicename.c 344377 2019-02-20 19:13:09Z kevans $");
29
30#include <stand.h>
31
32#include "bootstrap.h"
33#include "libofw.h"
34#include "libzfs.h"
35
36static int ofw_parsedev(struct ofw_devdesc **, const char *, const char **);
37
38/*
39 * Point (dev) at an allocated device specifier for the device matching the
40 * path in (devspec). If it contains an explicit device specification,
41 * use that.  If not, use the default device.
42 */
43int
44ofw_getdev(void **vdev, const char *devspec, const char **path)
45{
46    struct ofw_devdesc **dev = (struct ofw_devdesc **)vdev;
47    int				rv;
48
49    /*
50     * If it looks like this is just a path and no
51     * device, go with the current device.
52     */
53    if ((devspec == NULL) ||
54	((strchr(devspec, '@') == NULL) &&
55	(strchr(devspec, ':') == NULL))) {
56
57	if (((rv = ofw_parsedev(dev, getenv("currdev"), NULL)) == 0) &&
58	    (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(ofw_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 */
74static int
75ofw_parsedev(struct ofw_devdesc **dev, const char *devspec, const char **path)
76{
77    struct ofw_devdesc	*idev;
78    struct devsw	*dv;
79    phandle_t		handle;
80    const char		*p;
81    const char		*s;
82    char		*ep;
83    char		name[256];
84    char		type[64];
85    int			err;
86    int			len;
87    int			i;
88
89    for (p = s = devspec; *s != '\0'; p = s) {
90	if ((s = strchr(p + 1, '/')) == NULL)
91	    s = strchr(p, '\0');
92	len = s - devspec;
93	bcopy(devspec, name, len);
94	name[len] = '\0';
95	if ((handle = OF_finddevice(name)) == -1) {
96	    bcopy(name, type, len);
97	    type[len] = '\0';
98	} else if (OF_getprop(handle, "device_type", type, sizeof(type)) == -1)
99	    continue;
100	for (i = 0; (dv = devsw[i]) != NULL; i++) {
101	    if (strncmp(dv->dv_name, type, strlen(dv->dv_name)) == 0)
102		goto found;
103	}
104    }
105    return(ENOENT);
106
107found:
108    if (path != NULL)
109	*path = s;
110    idev = malloc(sizeof(struct ofw_devdesc));
111    if (idev == NULL) {
112	printf("ofw_parsedev: malloc failed\n");
113	return ENOMEM;
114    }
115    strcpy(idev->d_path, name);
116    idev->dd.d_dev = dv;
117    if (dv->dv_type == DEVT_ZFS) {
118	p = devspec + strlen(dv->dv_name);
119	err = zfs_parsedev((struct zfs_devdesc *)idev, p, path);
120	if (err != 0) {
121	    free(idev);
122	    return (err);
123	}
124    }
125
126    if (dev == NULL) {
127	free(idev);
128    } else {
129	*dev = idev;
130    }
131    return(0);
132}
133
134int
135ofw_setcurrdev(struct env_var *ev, int flags, const void *value)
136{
137    struct ofw_devdesc	*ncurr;
138    int			rv;
139
140    if ((rv = ofw_parsedev(&ncurr, value, NULL)) != 0)
141	return rv;
142
143    free(ncurr);
144    env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
145    return 0;
146}
147