rem_drv.c revision 4145:90dc07a3821d 
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26#pragma ident	"%Z%%M%	%I%	%E% SMI"
27
28#include <stdio.h>
29#include <stdlib.h>
30#include <unistd.h>
31#include <errno.h>
32#include <libintl.h>
33#include <string.h>
34#include <fcntl.h>
35#include <sys/buf.h>
36#include <sys/stat.h>
37#include <sys/wait.h>
38#include <limits.h>
39#include <malloc.h>
40#include <locale.h>
41#include <ftw.h>
42#include <sys/types.h>
43#include <sys/mkdev.h>
44#include "addrem.h"
45#include "errmsg.h"
46
47#define	FT_DEPTH	15	/* device tree depth for nftw() */
48
49static void usage(void);
50
51int
52main(int argc, char *argv[])
53{
54	int opt;
55	char *basedir = NULL, *driver_name = NULL;
56	int server = 0, mod_unloaded = 0;
57	int modid, found;
58	char maj_num[MAX_STR_MAJOR + 1];
59	int err;
60
61	(void) setlocale(LC_ALL, "");
62#if	!defined(TEXT_DOMAIN)	/* Should be defined by cc -D */
63#define	TEXT_DOMAIN "SYS_TEST"	/* Use this only if it weren't */
64#endif
65	(void) textdomain(TEXT_DOMAIN);
66
67	/*  must be run by root */
68
69	if (getuid() != 0) {
70		(void) fprintf(stderr, gettext(ERR_NOT_ROOT));
71		exit(1);
72	}
73
74	while ((opt = getopt(argc, argv, "b:")) != -1) {
75		switch (opt) {
76		case 'b' :
77			server = 1;
78			basedir = calloc(strlen(optarg) + 1, 1);
79			if (basedir == NULL) {
80				(void) fprintf(stderr, gettext(ERR_NO_MEM));
81				exit(1);
82			}
83			(void) strcat(basedir, optarg);
84			break;
85		case '?' :
86			usage();
87			exit(1);
88		}
89	}
90
91	if (argv[optind] != NULL) {
92		driver_name = calloc(strlen(argv[optind]) + 1, 1);
93		if (driver_name == NULL) {
94			(void) fprintf(stderr, gettext(ERR_NO_MEM));
95			exit(1);
96
97		}
98		(void) strcat(driver_name, argv[optind]);
99		/*
100		 * check for extra args
101		 */
102		if ((optind + 1) != argc) {
103			usage();
104			exit(1);
105		}
106
107	} else {
108		usage();
109		exit(1);
110	}
111
112	/* set up add_drv filenames */
113	if ((build_filenames(basedir)) == ERROR) {
114		exit(1);
115	}
116
117	/* must be only running version of add_drv/mod_drv/rem_drv */
118	enter_lock();
119
120	if ((check_perms_aliases(1, 1)) == ERROR)
121		err_exit();
122
123	if ((check_name_to_major(R_OK | W_OK)) == ERROR)
124		err_exit();
125
126	/* look up the major number of the driver being removed. */
127	if ((found = get_major_no(driver_name, name_to_major)) == ERROR) {
128		(void) fprintf(stderr, gettext(ERR_MAX_MAJOR), name_to_major);
129		err_exit();
130	}
131	if (found == UNIQUE) {
132		(void) fprintf(stderr, gettext(ERR_NOT_INSTALLED),
133		    driver_name);
134		err_exit();
135	}
136
137	if (!server) {
138		mod_unloaded = 1;
139
140		/* get the module id for this driver */
141		get_modid(driver_name, &modid);
142
143		/* module is installed */
144		if (modid != -1) {
145			if (modctl(MODUNLOAD, modid) < 0) {
146				perror(NULL);
147				(void) fprintf(stderr, gettext(ERR_MODUN),
148				    driver_name);
149				mod_unloaded = 0;
150			}
151		}
152		/* unload driver.conf file */
153		if (modctl(MODUNLOADDRVCONF, (major_t)found) < 0) {
154			perror(NULL);
155			(void) fprintf(stderr,
156			    gettext("cannot unload %s.conf\n"), driver_name);
157		}
158	}
159
160	if (mod_unloaded && (modctl(MODREMMAJBIND, (major_t)found) < 0)) {
161		perror(NULL);
162		(void) fprintf(stderr, gettext(ERR_MODREMMAJ), found);
163	}
164	/*
165	 * add driver to rem_name_to_major; if this fails, don`t
166	 * delete from name_to_major
167	 */
168	(void) sprintf(maj_num, "%d", found);
169
170	if (append_to_file(driver_name, maj_num,
171	    rem_name_to_major, ' ', " ", 0) == ERROR) {
172		(void) fprintf(stderr, gettext(ERR_NO_UPDATE),
173		    rem_name_to_major);
174		err_exit();
175	}
176
177	/*
178	 * If removing the driver from the running system, notify
179	 * kernel dynamically to remove minor perm entries.
180	 */
181	if (basedir == NULL || (strcmp(basedir, "/") == 0)) {
182		err = devfs_rm_minor_perm(driver_name, log_minorperm_error);
183		if (err != 0) {
184			(void) fprintf(stderr, gettext(ERR_UPDATE_PERM),
185				driver_name, err);
186		}
187	}
188
189	/*
190	 * delete references to driver in add_drv/rem_drv database
191	 */
192	remove_entry(CLEAN_ALL, driver_name);
193
194	/*
195	 * Clean up any dangling devfs shadow nodes for this
196	 * driver so that, in the event the driver is re-added
197	 * to the system, newly created nodes won't incorrectly
198	 * pick up these stale shadow node permissions.
199	 */
200	if (basedir == NULL || (strcmp(basedir, "/") == 0)) {
201		err = modctl(MODREMDRVCLEANUP, driver_name, 0, NULL);
202		if (err != 0) {
203			(void) fprintf(stderr, gettext(ERR_REMDRV_CLEANUP),
204				driver_name, err);
205		}
206	}
207
208	exit_unlock();
209
210	return (NOERR);
211}
212
213static void
214usage()
215{
216	(void) fprintf(stderr, gettext(REM_USAGE1));
217}
218