xref: /illumos-gate/usr/src/cmd/modload/rem_drv.c (revision 89b2a9fbeabf42fa54594df0e5927bcc50a07cc9)
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 2009 Sun Microsystems, Inc.  All rights reserved.
23  * Use is subject to license terms.
24  */
25 
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <unistd.h>
29 #include <errno.h>
30 #include <libintl.h>
31 #include <string.h>
32 #include <fcntl.h>
33 #include <sys/buf.h>
34 #include <sys/stat.h>
35 #include <sys/wait.h>
36 #include <limits.h>
37 #include <malloc.h>
38 #include <locale.h>
39 #include <ftw.h>
40 #include <sys/types.h>
41 #include <sys/mkdev.h>
42 #include <sys/modctl.h>
43 #include <sys/instance.h>
44 #include <libdevinfo.h>
45 #include <zone.h>
46 
47 #include "addrem.h"
48 #include "errmsg.h"
49 
50 #define	FT_DEPTH	15	/* device tree depth for nftw() */
51 
52 static void usage(void);
53 static void cleanup_devfs_attributes(char *, char *);
54 
55 int
56 main(int argc, char *argv[])
57 {
58 	int opt;
59 	char *basedir = NULL, *driver_name = NULL;
60 	int server = 0, mod_unloaded = 0;
61 	int modid, found;
62 	char maj_num[MAX_STR_MAJOR + 1];
63 	int cleanup = 0;
64 	int err;
65 	int n_flag = 0;
66 
67 	(void) setlocale(LC_ALL, "");
68 #if	!defined(TEXT_DOMAIN)	/* Should be defined by cc -D */
69 #define	TEXT_DOMAIN "SYS_TEST"	/* Use this only if it weren't */
70 #endif
71 	(void) textdomain(TEXT_DOMAIN);
72 
73 	/*  must be run by root */
74 
75 	if (getuid() != 0) {
76 		(void) fprintf(stderr, gettext(ERR_NOT_ROOT));
77 		exit(1);
78 	}
79 
80 	while ((opt = getopt(argc, argv, "b:Cn")) != -1) {
81 		switch (opt) {
82 		case 'b' :
83 			server = 1;
84 			basedir = calloc(strlen(optarg) + 1, 1);
85 			if (basedir == NULL) {
86 				(void) fprintf(stderr, gettext(ERR_NO_MEM));
87 				exit(1);
88 			}
89 			(void) strcat(basedir, optarg);
90 			break;
91 		case 'C':
92 			cleanup = 1;
93 			break;
94 		case 'n':
95 			n_flag = 1;
96 			break;
97 		case '?' :
98 			usage();
99 			exit(1);
100 		}
101 	}
102 
103 	if (argv[optind] != NULL) {
104 		driver_name = calloc(strlen(argv[optind]) + 1, 1);
105 		if (driver_name == NULL) {
106 			(void) fprintf(stderr, gettext(ERR_NO_MEM));
107 			exit(1);
108 
109 		}
110 		(void) strcat(driver_name, argv[optind]);
111 		/*
112 		 * check for extra args
113 		 */
114 		if ((optind + 1) != argc) {
115 			usage();
116 			exit(1);
117 		}
118 
119 	} else {
120 		usage();
121 		exit(1);
122 	}
123 
124 	if (getzoneid() != GLOBAL_ZONEID) {
125 		(void) fprintf(stderr, gettext(ERR_NOT_GLOBAL_ZONE));
126 		exit(1);
127 	}
128 
129 	/* set up add_drv filenames */
130 	if ((build_filenames(basedir)) == ERROR) {
131 		exit(1);
132 	}
133 
134 	/* must be only running version of add_drv/mod_drv/rem_drv */
135 	enter_lock();
136 
137 	if ((check_perms_aliases(1, 1)) == ERROR)
138 		err_exit();
139 
140 	if ((check_name_to_major(R_OK | W_OK)) == ERROR)
141 		err_exit();
142 
143 	/* look up the major number of the driver being removed. */
144 	if ((found = get_major_no(driver_name, name_to_major)) == ERROR) {
145 		(void) fprintf(stderr, gettext(ERR_MAX_MAJOR), name_to_major);
146 		err_exit();
147 	}
148 	if (found == UNIQUE) {
149 		(void) fprintf(stderr, gettext(ERR_NOT_INSTALLED),
150 		    driver_name);
151 		err_exit();
152 	}
153 
154 	if (n_flag == 0 && !server) {
155 		mod_unloaded = 1;
156 
157 		/* get the module id for this driver */
158 		get_modid(driver_name, &modid);
159 
160 		/* module is installed */
161 		if (modid != -1) {
162 			if (modctl(MODUNLOAD, modid) < 0) {
163 				perror(NULL);
164 				(void) fprintf(stderr, gettext(ERR_MODUN),
165 				    driver_name);
166 				mod_unloaded = 0;
167 			}
168 		}
169 		/* unload driver.conf file */
170 		if (modctl(MODUNLOADDRVCONF, (major_t)found) < 0) {
171 			perror(NULL);
172 			(void) fprintf(stderr,
173 			    gettext("cannot unload %s.conf\n"), driver_name);
174 		}
175 	}
176 
177 	if (mod_unloaded && (modctl(MODREMMAJBIND, (major_t)found) < 0)) {
178 		perror(NULL);
179 		(void) fprintf(stderr, gettext(ERR_MODREMMAJ), found);
180 	}
181 	/*
182 	 * add driver to rem_name_to_major; if this fails, don`t
183 	 * delete from name_to_major
184 	 */
185 	(void) sprintf(maj_num, "%d", found);
186 
187 	if (append_to_file(driver_name, maj_num,
188 	    rem_name_to_major, ' ', " ", 0) == ERROR) {
189 		(void) fprintf(stderr, gettext(ERR_NO_UPDATE),
190 		    rem_name_to_major);
191 		err_exit();
192 	}
193 
194 	/*
195 	 * If removing the driver from the running system, notify
196 	 * kernel dynamically to remove minor perm entries.
197 	 */
198 	if ((n_flag == 0) &&
199 	    (basedir == NULL || (strcmp(basedir, "/") == 0))) {
200 		err = devfs_rm_minor_perm(driver_name, log_minorperm_error);
201 		if (err != 0) {
202 			(void) fprintf(stderr, gettext(ERR_UPDATE_PERM),
203 			    driver_name, err);
204 		}
205 	}
206 
207 	/*
208 	 * delete references to driver in add_drv/rem_drv database
209 	 */
210 	remove_entry(CLEAN_ALL, driver_name);
211 
212 	/*
213 	 * Optionally clean up any dangling devfs shadow nodes for
214 	 * this driver so that, in the event the driver is re-added
215 	 * to the system, newly created nodes won't incorrectly
216 	 * pick up these stale shadow node permissions.
217 	 */
218 	if ((n_flag == 0) && cleanup) {
219 		if ((basedir == NULL || (strcmp(basedir, "/") == 0))) {
220 			err = modctl(MODREMDRVCLEANUP, driver_name, 0, NULL);
221 			if (err != 0) {
222 				(void) fprintf(stderr,
223 				    gettext(ERR_REMDRV_CLEANUP),
224 				    driver_name, err);
225 			}
226 		} else if (strcmp(basedir, "/") != 0) {
227 			cleanup_devfs_attributes(basedir, driver_name);
228 		}
229 	}
230 
231 	exit_unlock();
232 
233 	return (NOERR);
234 }
235 
236 /*
237  * Optionally remove attribute nodes for a driver when
238  * removing drivers on a mounted root image.  Useful
239  * when reprovisioning a machine to return to default
240  * permission/ownership settings if the driver is
241  * re-installed.
242  */
243 typedef struct cleanup_arg {
244 	char	*ca_basedir;
245 	char	*ca_drvname;
246 } cleanup_arg_t;
247 
248 
249 /*
250  * Callback to remove a minor node for a device
251  */
252 /*ARGSUSED*/
253 static int
254 cleanup_minor_walker(void *cb_arg, const char *minor_path)
255 {
256 	if (unlink(minor_path) == -1) {
257 		(void) fprintf(stderr, "rem_drv: error removing %s - %s\n",
258 		    minor_path, strerror(errno));
259 	}
260 	return (DI_WALK_CONTINUE);
261 }
262 
263 /*
264  * Callback for each device registered in the binding file (path_to_inst)
265  */
266 /*ARGSUSED*/
267 static int
268 cleanup_device_walker(void *cb_arg, const char *inst_path,
269     int inst_number, const char *inst_driver)
270 {
271 	char path[MAXPATHLEN];
272 	cleanup_arg_t *arg = (cleanup_arg_t *)cb_arg;
273 	int rv = DI_WALK_CONTINUE;
274 
275 	if (strcmp(inst_driver, arg->ca_drvname) == 0) {
276 		if (snprintf(path, MAXPATHLEN, "%s/devices%s",
277 		    arg->ca_basedir, inst_path) < MAXPATHLEN) {
278 			rv = devfs_walk_minor_nodes(path,
279 			    cleanup_minor_walker, NULL);
280 		}
281 	}
282 	return (rv);
283 }
284 
285 static void
286 cleanup_devfs_attributes(char *basedir, char *driver_name)
287 {
288 	cleanup_arg_t arg;
289 	char binding_path[MAXPATHLEN+1];
290 
291 	(void) snprintf(binding_path, MAXPATHLEN,
292 	    "%s%s", basedir, INSTANCE_FILE);
293 
294 	arg.ca_basedir = basedir;
295 	arg.ca_drvname = driver_name;
296 	(void) devfs_parse_binding_file(binding_path,
297 	    cleanup_device_walker, (void *)&arg);
298 }
299 
300 static void
301 usage()
302 {
303 	(void) fprintf(stderr, gettext(REM_USAGE1));
304 }
305