usr.sbin/rpc.umntall/rpc.umntall.c

   1 /*
   2  * Copyright (c) 1999 Martin Blapp
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/usr.sbin/rpc.umntall/rpc.umntall.c,v 1.13 2005/05/27 00:05:16 mux Exp $
  27  * $DragonFly: src/usr.sbin/rpc.umntall/rpc.umntall.c,v 1.7 2008/11/12 21:44:59 swildner Exp $
  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 <rpc/pmap_clnt.h>
  36 #include <nfs/rpcv2.h>
  37
  38 #include <err.h>
  39 #include <netdb.h>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43 #include <unistd.h>
  44 #include <resolv.h>
  45
  46 #include "mounttab.h"
  47
  48 int verbose;
  49 int fastopt;
  50
  51 static int do_umount (char *, char *);
  52 static int do_umntall (char *);
  53 static int is_mounted (char *, char *);
  54 static void usage (void);
  55
  56 int     xdr_dir (XDR *, char *);
  57
  58 int
  59 main(int argc, char **argv) {
  60         int ch, keep, success, pathlen;
  61         time_t expire, now;
  62         char *host, *path;
  63         struct mtablist *mtab;
  64
  65         expire = 0;
  66         host = path = NULL;
  67         success = keep = verbose = 0;
  68         while ((ch = getopt(argc, argv, "h:kp:ve:")) != -1)
  69                 switch (ch) {
  70                 case 'h':
  71                         host = optarg;
  72                         break;
  73                 case 'e':
  74                         expire = atoi(optarg);
  75                         break;
  76                 case 'k':
  77                         keep = 1;
  78                         break;
  79                 case 'p':
  80                         path = optarg;
  81                         break;
  82                 case 'v':
  83                         verbose = 1;
  84                         break;
  85                 case '?':
  86                         usage();
  87                 default:
  88                         break;
  89                 }
  90         argc -= optind;
  91         argv += optind;
  92
  93         /* Default expiretime is one day */
  94         if (expire == 0)
  95                 expire = 86400;
  96         time(&now);
  97
  98         /* Read PATH_MOUNTTAB. */
  99         if (!read_mtab()) {
 100                 if (verbose)
 101                         warnx("no mounttab entries (%s does not exist)",
 102                             PATH_MOUNTTAB);
 103                 mtabhead = NULL;
 104         }
 105
 106         if (host == NULL && path == NULL) {
 107                 /* Check each entry and do any necessary unmount RPCs. */
 108                 for (mtab = mtabhead; mtab != NULL; mtab = mtab->mtab_next) {
 109                         if (*mtab->mtab_host == '\0')
 110                                 continue;
 111                         if (mtab->mtab_time + expire < now) {
 112                                 /* Clear expired entry. */
 113                                 if (verbose)
 114                                         warnx("remove expired entry %s:%s",
 115                                             mtab->mtab_host, mtab->mtab_dirp);
 116                                 bzero(mtab->mtab_host,
 117                                     sizeof(mtab->mtab_host));
 118                                 continue;
 119                         }
 120                         if (keep && is_mounted(mtab->mtab_host,
 121                             mtab->mtab_dirp)) {
 122                                 if (verbose)
 123                                         warnx("skip entry %s:%s",
 124                                             mtab->mtab_host, mtab->mtab_dirp);
 125                                 continue;
 126                         }
 127                         if (do_umount(mtab->mtab_host, mtab->mtab_dirp)) {
 128                                 if (verbose)
 129                                         warnx("umount RPC for %s:%s succeeded",
 130                                             mtab->mtab_host, mtab->mtab_dirp);
 131                                 /* Remove all entries for this host + path. */
 132                                 clean_mtab(mtab->mtab_host, mtab->mtab_dirp,
 133                                     verbose);
 134                         }
 135                 }
 136                 success = 1;
 137         } else {
 138                 if (host == NULL && path != NULL)
 139                         /* Missing hostname. */
 140                         usage();
 141                 if (path == NULL) {
 142                         /* Do a RPC UMNTALL for this specific host */
 143                         success = do_umntall(host);
 144                         if (verbose && success)
 145                                 warnx("umntall RPC for %s succeeded", host);
 146                 } else {
 147                         /* Do a RPC UMNTALL for this specific mount */
 148                         for (pathlen = strlen(path);
 149                             pathlen > 1 && path[pathlen - 1] == '/'; pathlen--)
 150                                 path[pathlen - 1] = '\0';
 151                         success = do_umount(host, path);
 152                         if (verbose && success)
 153                                 warnx("umount RPC for %s:%s succeeded", host,
 154                                     path);
 155                 }
 156                 /* If successful, remove any corresponding mounttab entries. */
 157                 if (success)
 158                         clean_mtab(host, path, verbose);
 159         }
 160         /* Write and unlink PATH_MOUNTTAB if necessary */
 161         if (success)
 162                 success = write_mtab(verbose);
 163         free_mtab();
 164         exit (success ? 0 : 1);
 165 }
 166
 167 /*
 168  * Send a RPC_MNT UMNTALL request to hostname.
 169  * XXX This works for all mountd implementations,
 170  * but produces a RPC IOERR on non FreeBSD systems.
 171  */
 172 int
 173 do_umntall(char *hostname) {
 174         enum clnt_stat clnt_stat;
 175         struct timeval try;
 176         CLIENT *clp;
 177
 178         try.tv_sec = 3;
 179         try.tv_usec = 0;
 180         clp = clnt_create_timed(hostname, RPCPROG_MNT, RPCMNT_VER1, "udp",
 181             &try);
 182         if (clp == NULL) {
 183                 warnx("%s: %s", hostname, clnt_spcreateerror("RPCPROG_MNT"));
 184                 return (0);
 185         }
 186         clp->cl_auth = authunix_create_default();
 187         clnt_stat = clnt_call(clp, RPCMNT_UMNTALL,
 188             (xdrproc_t)xdr_void, (caddr_t)0,
 189             (xdrproc_t)xdr_void, (caddr_t)0, try);
 190         if (clnt_stat != RPC_SUCCESS)
 191                 warnx("%s: %s", hostname, clnt_sperror(clp, "RPCMNT_UMNTALL"));
 192         auth_destroy(clp->cl_auth);
 193         clnt_destroy(clp);
 194         return (clnt_stat == RPC_SUCCESS);
 195 }
 196
 197 /*
 198  * Send a RPC_MNT UMOUNT request for dirp to hostname.
 199  */
 200 int
 201 do_umount(char *hostname, char *dirp) {
 202         enum clnt_stat clnt_stat;
 203         struct timeval try;
 204         CLIENT *clp;
 205
 206         try.tv_sec = 3;
 207         try.tv_usec = 0;
 208         clp = clnt_create_timed(hostname, RPCPROG_MNT, RPCMNT_VER1, "udp",
 209             &try);
 210         if (clp  == NULL) {
 211                 warnx("%s: %s", hostname, clnt_spcreateerror("RPCPROG_MNT"));
 212                 return (0);
 213         }
 214         clp->cl_auth = authsys_create_default();
 215         clnt_stat = clnt_call(clp, RPCMNT_UMOUNT, (xdrproc_t)xdr_dir, dirp,
 216             (xdrproc_t)xdr_void, (caddr_t)0, try);
 217         if (clnt_stat != RPC_SUCCESS)
 218                 warnx("%s: %s", hostname, clnt_sperror(clp, "RPCMNT_UMOUNT"));
 219         auth_destroy(clp->cl_auth);
 220         clnt_destroy(clp);
 221         return (clnt_stat == RPC_SUCCESS);
 222 }
 223
 224 /*
 225  * Check if the entry is still/already mounted.
 226  */
 227 int
 228 is_mounted(char *hostname, char *dirp) {
 229         struct statfs *mntbuf;
 230         char name[MNAMELEN + 1];
 231         size_t bufsize;
 232         int mntsize, i;
 233
 234         if (strlen(hostname) + strlen(dirp) >= MNAMELEN)
 235                 return (0);
 236         snprintf(name, sizeof(name), "%s:%s", hostname, dirp);
 237         mntsize = getfsstat(NULL, 0, MNT_NOWAIT);
 238         if (mntsize <= 0)
 239                 return (0);
 240         bufsize = (mntsize + 1) * sizeof(struct statfs);
 241         if ((mntbuf = malloc(bufsize)) == NULL)
 242                 err(1, "malloc");
 243         mntsize = getfsstat(mntbuf, (long)bufsize, MNT_NOWAIT);
 244         for (i = mntsize - 1; i >= 0; i--) {
 245                 if (strcmp(mntbuf[i].f_mntfromname, name) == 0) {
 246                         free(mntbuf);
 247                         return (1);
 248                 }
 249         }
 250         free(mntbuf);
 251         return (0);
 252 }
 253
 254 /*
 255  * xdr routines for mount rpc's
 256  */
 257 int
 258 xdr_dir(XDR *xdrsp, char *dirp) {
 259         return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
 260 }
 261
 262 static void
 263 usage(void) {
 264         fprintf(stderr, "%s\n",
 265             "usage: rpc.umntall [-kv] [-e expire] [-h host] [-p path]");
 266         exit(1);
 267 }