kldload.c revision 211990 
1/*-
2 * Copyright (c) 1997 Doug Rabson
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: head/sbin/kldload/kldload.c 211990 2010-08-30 07:29:27Z maxim $");
29
30#include <sys/types.h>
31#include <sys/param.h>
32#include <sys/linker.h>
33#include <sys/sysctl.h>
34#include <sys/stat.h>
35#include <err.h>
36#include <stdio.h>
37#include <stdlib.h>
38#include <string.h>
39#include <unistd.h>
40
41#define	PATHCTL	"kern.module_path"
42
43static int	path_check(const char *, int);
44static void	usage(void);
45
46/*
47 * Check to see if the requested module is specified as a filename with no
48 * path.  If so and if a file by the same name exists in the module path,
49 * warn the user that the module in the path will be used in preference.
50 */
51static int
52path_check(const char *kldname, int quiet)
53{
54	int	mib[5], found;
55	size_t	miblen, pathlen;
56	char	kldpath[MAXPATHLEN];
57	char	*path, *tmppath, *element;
58	struct	stat sb;
59	dev_t	dev;
60	ino_t	ino;
61
62	if (strchr(kldname, '/') != NULL) {
63		return (0);
64	}
65	if (strstr(kldname, ".ko") == NULL) {
66		return (0);
67	}
68	if (stat(kldname, &sb) != 0) {
69		return (0);
70	}
71
72	found = 0;
73	dev = sb.st_dev;
74	ino = sb.st_ino;
75
76	miblen = sizeof(mib) / sizeof(mib[0]);
77	if (sysctlnametomib(PATHCTL, mib, &miblen) != 0) {
78		err(1, "sysctlnametomib(%s)", PATHCTL);
79	}
80	if (sysctl(mib, miblen, NULL, &pathlen, NULL, 0) == -1) {
81		err(1, "getting path: sysctl(%s) - size only", PATHCTL);
82	}
83	path = malloc(pathlen + 1);
84	if (path == NULL) {
85		err(1, "allocating %lu bytes for the path",
86		    (unsigned long)pathlen + 1);
87	}
88	if (sysctl(mib, miblen, path, &pathlen, NULL, 0) == -1) {
89		err(1, "getting path: sysctl(%s)", PATHCTL);
90	}
91	tmppath = path;
92
93	while ((element = strsep(&tmppath, ";")) != NULL) {
94		strlcpy(kldpath, element, MAXPATHLEN);
95		if (kldpath[strlen(kldpath) - 1] != '/') {
96			strlcat(kldpath, "/", MAXPATHLEN);
97		}
98		strlcat(kldpath, kldname, MAXPATHLEN);
99
100		if (stat(kldpath, &sb) == -1) {
101			continue;
102		}
103
104		found = 1;
105
106		if (sb.st_dev != dev || sb.st_ino != ino) {
107			if (!quiet) {
108				warnx("%s will be loaded from %s, not the "
109				    "current directory", kldname, element);
110			}
111			break;
112		} else if (sb.st_dev == dev && sb.st_ino == ino) {
113			break;
114		}
115	}
116
117	free(path);
118
119	if (!found) {
120		if (!quiet) {
121			warnx("%s is not in the module path", kldname);
122		}
123		return (-1);
124	}
125
126	return (0);
127}
128
129static void
130usage(void)
131{
132	fprintf(stderr, "usage: kldload [-qv] file ...\n");
133	exit(1);
134}
135
136int
137main(int argc, char** argv)
138{
139	int c;
140	int errors;
141	int fileid;
142	int verbose;
143	int quiet;
144
145	errors = 0;
146	verbose = 0;
147	quiet = 0;
148
149	while ((c = getopt(argc, argv, "qv")) != -1) {
150		switch (c) {
151		case 'q':
152			quiet = 1;
153			verbose = 0;
154			break;
155		case 'v':
156			verbose = 1;
157			quiet = 0;
158			break;
159		default:
160			usage();
161		}
162	}
163	argc -= optind;
164	argv += optind;
165
166	if (argc == 0)
167		usage();
168
169	while (argc-- != 0) {
170		if (path_check(argv[0], quiet) == 0) {
171			fileid = kldload(argv[0]);
172			if (fileid < 0) {
173				warn("can't load %s", argv[0]);
174				errors++;
175			} else {
176				if (verbose)
177					printf("Loaded %s, id=%d\n", argv[0],
178					    fileid);
179			}
180		} else {
181			errors++;
182		}
183		argv++;
184	}
185
186	return (errors ? 1 : 0);
187}
188