1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 1999 Martin Blapp
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 
30 #include <sys/param.h>
31 #include <sys/ucred.h>
32 #include <sys/mount.h>
33 
34 #include <rpc/rpc.h>
35 #include <rpcsvc/mount.h>
36 
37 #include <err.h>
38 #include <netdb.h>
39 #include <stdio.h>
40 #include <stdlib.h>
41 #include <string.h>
42 #include <unistd.h>
43 
44 #include "mounttab.h"
45 
46 int verbose;
47 
48 static int do_umount (char *, char *);
49 static int do_umntall (char *);
50 static int is_mounted (char *, char *);
51 static void usage (void);
52 int	xdr_dir (XDR *, char *);
53 
54 int
main(int argc,char ** argv)55 main(int argc, char **argv) {
56 	int ch, keep, success, pathlen;
57 	time_t expire, now;
58 	char *host, *path;
59 	struct mtablist *mtab;
60 
61 	expire = 0;
62 	host = path = NULL;
63 	success = keep = verbose = 0;
64 	while ((ch = getopt(argc, argv, "h:kp:ve:")) != -1)
65 		switch (ch) {
66 		case 'h':
67 			host = optarg;
68 			break;
69 		case 'e':
70 			expire = atoi(optarg);
71 			break;
72 		case 'k':
73 			keep = 1;
74 			break;
75 		case 'p':
76 			path = optarg;
77 			break;
78 		case 'v':
79 			verbose = 1;
80 			break;
81 		case '?':
82 			usage();
83 		default:
84 			break;
85 		}
86 	argc -= optind;
87 	argv += optind;
88 
89 	/* Default expiretime is one day */
90 	if (expire == 0)
91 		expire = 86400;
92 	time(&now);
93 
94 	/* Read PATH_MOUNTTAB. */
95 	if (!read_mtab()) {
96 		if (verbose)
97 			warnx("no mounttab entries (%s does not exist)",
98 			    PATH_MOUNTTAB);
99 		mtabhead = NULL;
100 	}
101 
102 	if (host == NULL && path == NULL) {
103 		/* Check each entry and do any necessary unmount RPCs. */
104 		for (mtab = mtabhead; mtab != NULL; mtab = mtab->mtab_next) {
105 			if (*mtab->mtab_host == '\0')
106 				continue;
107 			if (mtab->mtab_time + expire < now) {
108 				/* Clear expired entry. */
109 				if (verbose)
110 					warnx("remove expired entry %s:%s",
111 					    mtab->mtab_host, mtab->mtab_dirp);
112 				bzero(mtab->mtab_host,
113 				    sizeof(mtab->mtab_host));
114 				continue;
115 			}
116 			if (keep && is_mounted(mtab->mtab_host,
117 			    mtab->mtab_dirp)) {
118 				if (verbose)
119 					warnx("skip entry %s:%s",
120 					    mtab->mtab_host, mtab->mtab_dirp);
121 				continue;
122 			}
123 			if (do_umount(mtab->mtab_host, mtab->mtab_dirp)) {
124 				if (verbose)
125 					warnx("umount RPC for %s:%s succeeded",
126 					    mtab->mtab_host, mtab->mtab_dirp);
127 				/* Remove all entries for this host + path. */
128 				clean_mtab(mtab->mtab_host, mtab->mtab_dirp,
129 				    verbose);
130 			}
131 		}
132 		success = 1;
133 	} else {
134 		if (host == NULL && path != NULL)
135 			/* Missing hostname. */
136 			usage();
137 		if (path == NULL) {
138 			/* Do a RPC UMNTALL for this specific host */
139 			success = do_umntall(host);
140 			if (verbose && success)
141 				warnx("umntall RPC for %s succeeded", host);
142 		} else {
143 			/* Do a RPC UMNTALL for this specific mount */
144 			for (pathlen = strlen(path);
145 			    pathlen > 1 && path[pathlen - 1] == '/'; pathlen--)
146 				path[pathlen - 1] = '\0';
147 			success = do_umount(host, path);
148 			if (verbose && success)
149 				warnx("umount RPC for %s:%s succeeded", host,
150 				    path);
151 		}
152 		/* If successful, remove any corresponding mounttab entries. */
153 		if (success)
154 			clean_mtab(host, path, verbose);
155 	}
156 	/* Write and unlink PATH_MOUNTTAB if necessary */
157 	if (success)
158 		success = write_mtab(verbose);
159 	free_mtab();
160 	exit (success ? 0 : 1);
161 }
162 
163 /*
164  * Send a RPC_MNT UMNTALL request to hostname.
165  * XXX This works for all mountd implementations,
166  * but produces a RPC IOERR on non FreeBSD systems.
167  */
168 int
do_umntall(char * hostname)169 do_umntall(char *hostname) {
170 	enum clnt_stat clnt_stat;
171 	struct timeval try;
172 	CLIENT *clp;
173 
174 	try.tv_sec = 3;
175 	try.tv_usec = 0;
176 	clp = clnt_create_timed(hostname, MOUNTPROG, MOUNTVERS, "udp",
177 	    &try);
178 	if (clp == NULL) {
179 		warnx("%s: %s", hostname, clnt_spcreateerror("MOUNTPROG"));
180 		return (0);
181 	}
182 	clp->cl_auth = authunix_create_default();
183 	clnt_stat = clnt_call(clp, MOUNTPROC_UMNTALL,
184 	    (xdrproc_t)xdr_void, (caddr_t)0,
185 	    (xdrproc_t)xdr_void, (caddr_t)0, try);
186 	if (clnt_stat != RPC_SUCCESS)
187 		warnx("%s: %s", hostname, clnt_sperror(clp, "MOUNTPROC_UMNTALL"));
188 	auth_destroy(clp->cl_auth);
189 	clnt_destroy(clp);
190 	return (clnt_stat == RPC_SUCCESS);
191 }
192 
193 /*
194  * Send a RPC_MNT UMOUNT request for dirp to hostname.
195  */
196 int
do_umount(char * hostname,char * dirp)197 do_umount(char *hostname, char *dirp) {
198 	enum clnt_stat clnt_stat;
199 	struct timeval try;
200 	CLIENT *clp;
201 
202 	try.tv_sec = 3;
203 	try.tv_usec = 0;
204 	clp = clnt_create_timed(hostname, MOUNTPROG, MOUNTVERS, "udp",
205 	    &try);
206 	if (clp  == NULL) {
207 		warnx("%s: %s", hostname, clnt_spcreateerror("MOUNTPROG"));
208 		return (0);
209 	}
210 	clp->cl_auth = authsys_create_default();
211 	clnt_stat = clnt_call(clp, MOUNTPROC_UMNT, (xdrproc_t)xdr_dir, dirp,
212 	    (xdrproc_t)xdr_void, (caddr_t)0, try);
213 	if (clnt_stat != RPC_SUCCESS)
214 		warnx("%s: %s", hostname, clnt_sperror(clp, "MOUNTPROC_UMNT"));
215 	auth_destroy(clp->cl_auth);
216 	clnt_destroy(clp);
217 	return (clnt_stat == RPC_SUCCESS);
218 }
219 
220 /*
221  * Check if the entry is still/already mounted.
222  */
223 int
is_mounted(char * hostname,char * dirp)224 is_mounted(char *hostname, char *dirp) {
225 	struct statfs *mntbuf;
226 	char name[MNAMELEN + 1];
227 	size_t bufsize;
228 	int mntsize, i;
229 
230 	if (strlen(hostname) + strlen(dirp) >= MNAMELEN)
231 		return (0);
232 	snprintf(name, sizeof(name), "%s:%s", hostname, dirp);
233 	mntsize = getfsstat(NULL, 0, MNT_NOWAIT);
234 	if (mntsize <= 0)
235 		return (0);
236 	bufsize = (mntsize + 1) * sizeof(struct statfs);
237 	if ((mntbuf = malloc(bufsize)) == NULL)
238 		err(1, "malloc");
239 	mntsize = getfsstat(mntbuf, (long)bufsize, MNT_NOWAIT);
240 	for (i = mntsize - 1; i >= 0; i--) {
241 		if (strcmp(mntbuf[i].f_mntfromname, name) == 0) {
242 			free(mntbuf);
243 			return (1);
244 		}
245 	}
246 	free(mntbuf);
247 	return (0);
248 }
249 
250 /*
251  * xdr routines for mount rpc's
252  */
253 int
xdr_dir(XDR * xdrsp,char * dirp)254 xdr_dir(XDR *xdrsp, char *dirp) {
255 	return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
256 }
257 
258 static void
usage(void)259 usage(void)
260 {
261 	(void)fprintf(stderr, "%s\n",
262 	    "usage: rpc.umntall [-kv] [-e expire] [-h host] [-p path]");
263 	exit(1);
264 }
265