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