1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 1997 Doug Rabson
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/types.h>
30#include <sys/param.h>
31#include <sys/linker.h>
32#include <sys/sysctl.h>
33#include <sys/stat.h>
34#include <err.h>
35#include <stdio.h>
36#include <stdlib.h>
37#include <string.h>
38#include <unistd.h>
39#include <errno.h>
40
41#define	PATHCTL	"kern.module_path"
42
43/*
44 * Check to see if the requested module is specified as a filename with no
45 * path.  If so and if a file by the same name exists in the module path,
46 * warn the user that the module in the path will be used in preference.
47 */
48static int
49path_check(const char *kldname, int quiet)
50{
51	char	*path, *tmppath, *element;
52	struct	stat sb;
53	int	mib[5];
54	char	kldpath[MAXPATHLEN];
55	size_t	miblen, pathlen;
56	dev_t	dev;
57	ino_t	ino;
58	int	found;
59
60	if (strchr(kldname, '/') != NULL)
61		return (0);
62	if (strstr(kldname, ".ko") == NULL)
63		return (0);
64	if (stat(kldname, &sb) != 0)
65		return (0);
66
67	found = 0;
68	dev = sb.st_dev;
69	ino = sb.st_ino;
70
71	miblen = nitems(mib);
72	if (sysctlnametomib(PATHCTL, mib, &miblen) != 0)
73		err(1, "sysctlnametomib(%s)", PATHCTL);
74	if (sysctl(mib, miblen, NULL, &pathlen, NULL, 0) == -1)
75		err(1, "getting path: sysctl(%s) - size only", PATHCTL);
76	path = malloc(pathlen + 1);
77	if (path == NULL)
78		err(1, "allocating %lu bytes for the path",
79		    (unsigned long)pathlen + 1);
80	if (sysctl(mib, miblen, path, &pathlen, NULL, 0) == -1)
81		err(1, "getting path: sysctl(%s)", PATHCTL);
82	tmppath = path;
83
84	while ((element = strsep(&tmppath, ";")) != NULL) {
85		strlcpy(kldpath, element, MAXPATHLEN);
86		if (kldpath[strlen(kldpath) - 1] != '/') {
87			strlcat(kldpath, "/", MAXPATHLEN);
88		}
89		strlcat(kldpath, kldname, MAXPATHLEN);
90
91		if (stat(kldpath, &sb) == -1)
92			continue;
93
94		found = 1;
95
96		if (sb.st_dev != dev || sb.st_ino != ino) {
97			if (!quiet)
98				warnx("%s will be loaded from %s, not the "
99				    "current directory", kldname, element);
100			break;
101		} else if (sb.st_dev == dev && sb.st_ino == ino)
102			break;
103	}
104
105	free(path);
106
107	if (!found) {
108		if (!quiet)
109			warnx("%s is not in the module path", kldname);
110		return (-1);
111	}
112
113	return (0);
114}
115
116static void
117usage(void)
118{
119
120	fprintf(stderr, "usage: kldload [-nqv] file ...\n");
121	exit(1);
122}
123
124int
125main(int argc, char** argv)
126{
127	int c;
128	int check_loaded;
129	int errors;
130	int fileid;
131	int quiet;
132	int verbose;
133
134	errors = 0;
135	verbose = 0;
136	quiet = 0;
137	check_loaded = 0;
138
139	while ((c = getopt(argc, argv, "nqv")) != -1) {
140		switch (c) {
141		case 'q':
142			quiet = 1;
143			verbose = 0;
144			break;
145		case 'v':
146			verbose = 1;
147			quiet = 0;
148			break;
149		case 'n':
150			check_loaded = 1;
151			break;
152		default:
153			usage();
154		}
155	}
156	argc -= optind;
157	argv += optind;
158
159	if (argc == 0)
160		usage();
161
162	while (argc-- != 0) {
163		if (path_check(argv[0], quiet) == 0) {
164			fileid = kldload(argv[0]);
165			if (fileid < 0) {
166				if (check_loaded != 0 && errno == EEXIST) {
167					if (verbose)
168						printf("%s is already "
169						    "loaded\n", argv[0]);
170				} else {
171					if (!quiet) {
172						switch (errno) {
173						case EEXIST:
174							warnx("can't load %s: module "
175							    "already loaded or "
176							    "in kernel", argv[0]);
177							break;
178						case ENOEXEC:
179							warnx("an error occurred while "
180							    "loading module %s. "
181							    "Please check dmesg(8) for "
182							    "more details.", argv[0]);
183							break;
184						default:
185							warn("can't load %s", argv[0]);
186							break;
187						}
188					}
189					errors++;
190				}
191			} else {
192				if (verbose)
193					printf("Loaded %s, id=%d\n", argv[0],
194					    fileid);
195			}
196		} else
197			errors++;
198		argv++;
199	}
200
201	return (errors ? 1 : 0);
202}
203