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 1.3.2.1 2001/12/13 01:27:20 iedowse Exp $
  27  * $DragonFly: src/usr.sbin/rpc.umntall/rpc.umntall.c,v 1.6 2005/04/02 20:49:56 joerg 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 static struct hostent *gethostbyname_quick(const char *name);
  56
  57 int     xdr_dir (XDR *, char *);
  58
  59 int
  60 main(int argc, char **argv) {
  61         int ch, keep, success, pathlen;
  62         time_t expire, now;
  63         char *host, *path;
  64         struct mtablist *mtab;
  65
  66         expire = 0;
  67         host = path = NULL;
  68         success = keep = verbose = 0;
  69         while ((ch = getopt(argc, argv, "h:kp:vfe:")) != -1)
  70                 switch (ch) {
  71                 case 'h':
  72                         host = optarg;
  73                         break;
  74                 case 'e':
  75                         expire = atoi(optarg);
  76                         break;
  77                 case 'k':
  78                         keep = 1;
  79                         break;
  80                 case 'p':
  81                         path = optarg;
  82                         break;
  83                 case 'v':
  84                         verbose = 1;
  85                         break;
  86                 case 'f':
  87                         fastopt = 1;
  88                         break;
  89                 case '?':
  90                         usage();
  91                 default:
  92                         break;
  93                 }
  94         argc -= optind;
  95         argv += optind;
  96
  97         /* Default expiretime is one day */
  98         if (expire == 0)
  99                 expire = 86400;
 100         time(&now);
 101
 102         /* Read PATH_MOUNTTAB. */
 103         if (!read_mtab()) {
 104                 if (verbose)
 105                         warnx("no mounttab entries (%s does not exist)",
 106                             PATH_MOUNTTAB);
 107                 mtabhead = NULL;
 108         }
 109
 110         if (host == NULL && path == NULL) {
 111                 /* Check each entry and do any necessary unmount RPCs. */
 112                 for (mtab = mtabhead; mtab != NULL; mtab = mtab->mtab_next) {
 113                         if (*mtab->mtab_host == '\0')
 114                                 continue;
 115                         if (mtab->mtab_time + expire < now) {
 116                                 /* Clear expired entry. */
 117                                 if (verbose)
 118                                         warnx("remove expired entry %s:%s",
 119                                             mtab->mtab_host, mtab->mtab_dirp);
 120                                 bzero(mtab->mtab_host,
 121                                     sizeof(mtab->mtab_host));
 122                                 continue;
 123                         }
 124                         if (keep && is_mounted(mtab->mtab_host,
 125                             mtab->mtab_dirp)) {
 126                                 if (verbose)
 127                                         warnx("skip entry %s:%s",
 128                                             mtab->mtab_host, mtab->mtab_dirp);
 129                                 continue;
 130                         }
 131                         if (do_umount(mtab->mtab_host, mtab->mtab_dirp)) {
 132                                 if (verbose)
 133                                         warnx("umount RPC for %s:%s succeeded",
 134                                             mtab->mtab_host, mtab->mtab_dirp);
 135                                 /* Remove all entries for this host + path. */
 136                                 clean_mtab(mtab->mtab_host, mtab->mtab_dirp,
 137                                     verbose);
 138                         }
 139                 }
 140                 success = 1;
 141         } else {
 142                 if (host == NULL && path != NULL)
 143                         /* Missing hostname. */
 144                         usage();
 145                 if (path == NULL) {
 146                         /* Do a RPC UMNTALL for this specific host */
 147                         success = do_umntall(host);
 148                         if (verbose && success)
 149                                 warnx("umntall RPC for %s succeeded", host);
 150                 } else {
 151                         /* Do a RPC UMNTALL for this specific mount */
 152                         for (pathlen = strlen(path);
 153                             pathlen > 1 && path[pathlen - 1] == '/'; pathlen--)
 154                                 path[pathlen - 1] = '\0';
 155                         success = do_umount(host, path);
 156                         if (verbose && success)
 157                                 warnx("umount RPC for %s:%s succeeded", host,
 158                                     path);
 159                 }
 160                 /* If successful, remove any corresponding mounttab entries. */
 161                 if (success)
 162                         clean_mtab(host, path, verbose);
 163         }
 164         /* Write and unlink PATH_MOUNTTAB if necessary */
 165         if (success)
 166                 success = write_mtab(verbose);
 167         free_mtab();
 168         exit (success ? 0 : 1);
 169 }
 170
 171 /*
 172  * Send a RPC_MNT UMNTALL request to hostname.
 173  * XXX This works for all mountd implementations,
 174  * but produces a RPC IOERR on non FreeBSD systems.
 175  */
 176 int
 177 do_umntall(char *hostname) {
 178         enum clnt_stat clnt_stat;
 179         struct hostent *hp;
 180         struct sockaddr_in saddr;
 181         struct timeval pertry, try;
 182         int so;
 183         CLIENT *clp;
 184
 185         if ((hp = gethostbyname_quick(hostname)) == NULL) {
 186                 warnx("gethostbyname(%s) failed", hostname);
 187                 return (0);
 188         }
 189         memset(&saddr, 0, sizeof(saddr));
 190         saddr.sin_family = AF_INET;
 191         saddr.sin_port = 0;
 192         memmove(&saddr.sin_addr, hp->h_addr, MIN(hp->h_length,
 193             (int)sizeof(saddr.sin_addr)));
 194         pertry.tv_sec = 3;
 195         pertry.tv_usec = 0;
 196         if (fastopt)
 197             pmap_getport_timeout(NULL, &pertry);
 198         so = RPC_ANYSOCK;
 199         clp = clntudp_create(&saddr, RPCPROG_MNT, RPCMNT_VER1, pertry, &so);
 200         if (clp == NULL) {
 201                 warnx("%s: %s", hostname, clnt_spcreateerror("RPCPROG_MNT"));
 202                 return (0);
 203         }
 204         clp->cl_auth = authunix_create_default();
 205         try.tv_sec = 3;
 206         try.tv_usec = 0;
 207         clnt_stat = clnt_call(clp, RPCMNT_UMNTALL, xdr_void, (caddr_t)0,
 208             xdr_void, (caddr_t)0, try);
 209         if (clnt_stat != RPC_SUCCESS)
 210                 warnx("%s: %s", hostname, clnt_sperror(clp, "RPCMNT_UMNTALL"));
 211         auth_destroy(clp->cl_auth);
 212         clnt_destroy(clp);
 213         return (clnt_stat == RPC_SUCCESS);
 214 }
 215
 216 /*
 217  * Send a RPC_MNT UMOUNT request for dirp to hostname.
 218  */
 219 int
 220 do_umount(char *hostname, char *dirp) {
 221         enum clnt_stat clnt_stat;
 222         struct hostent *hp;
 223         struct sockaddr_in saddr;
 224         struct timeval pertry, try;
 225         CLIENT *clp;
 226         int so;
 227
 228         if ((hp = gethostbyname_quick(hostname)) == NULL) {
 229                 warnx("gethostbyname(%s) failed", hostname);
 230                 return (0);
 231         }
 232         memset(&saddr, 0, sizeof(saddr));
 233         saddr.sin_family = AF_INET;
 234         saddr.sin_port = 0;
 235         memmove(&saddr.sin_addr, hp->h_addr, MIN(hp->h_length,
 236                 (int)sizeof(saddr.sin_addr)));
 237         pertry.tv_sec = 3;
 238         pertry.tv_usec = 0;
 239         if (fastopt)
 240             pmap_getport_timeout(NULL, &pertry);
 241         so = RPC_ANYSOCK;
 242         clp = clntudp_create(&saddr, RPCPROG_MNT, RPCMNT_VER1, pertry, &so);
 243         if (clp  == NULL) {
 244                 warnx("%s: %s", hostname, clnt_spcreateerror("RPCPROG_MNT"));
 245                 return (0);
 246         }
 247         clp->cl_auth = authunix_create_default();
 248         try.tv_sec = 3;
 249         try.tv_usec = 0;
 250         clnt_stat = clnt_call(clp, RPCMNT_UMOUNT, xdr_dir, dirp,
 251             xdr_void, (caddr_t)0, try);
 252         if (clnt_stat != RPC_SUCCESS)
 253                 warnx("%s: %s", hostname, clnt_sperror(clp, "RPCMNT_UMOUNT"));
 254         auth_destroy(clp->cl_auth);
 255         clnt_destroy(clp);
 256         return (clnt_stat == RPC_SUCCESS);
 257 }
 258
 259 /*
 260  * Check if the entry is still/already mounted.
 261  */
 262 int
 263 is_mounted(char *hostname, char *dirp) {
 264         struct statfs *mntbuf;
 265         char name[MNAMELEN + 1];
 266         size_t bufsize;
 267         int mntsize, i;
 268
 269         if (strlen(hostname) + strlen(dirp) >= MNAMELEN)
 270                 return (0);
 271         snprintf(name, sizeof(name), "%s:%s", hostname, dirp);
 272         mntsize = getfsstat(NULL, 0, MNT_NOWAIT);
 273         if (mntsize <= 0)
 274                 return (0);
 275         bufsize = (mntsize + 1) * sizeof(struct statfs);
 276         if ((mntbuf = malloc(bufsize)) == NULL)
 277                 err(1, "malloc");
 278         mntsize = getfsstat(mntbuf, (long)bufsize, MNT_NOWAIT);
 279         for (i = mntsize - 1; i >= 0; i--) {
 280                 if (strcmp(mntbuf[i].f_mntfromname, name) == 0) {
 281                         free(mntbuf);
 282                         return (1);
 283                 }
 284         }
 285         free(mntbuf);
 286         return (0);
 287 }
 288
 289 /*
 290  * rpc.umntall is often called at boot.  If the network or target host has
 291  * issues we want to limit resolver stalls so rpc.umntall doesn't stall
 292  * the boot sequence forever.
 293  */
 294 struct hostent *
 295 gethostbyname_quick(const char *name)
 296 {
 297     struct hostent *he;
 298     int save_retrans;
 299     int save_retry;
 300
 301     save_retrans = _res.retrans;
 302     save_retry = _res.retry;
 303     if (fastopt) {
 304         _res.retrans = 1;
 305         _res.retry = 2;
 306     }
 307     he = gethostbyname(name);
 308     if (fastopt) {
 309         _res.retrans = save_retrans;
 310         _res.retry = save_retry;
 311     }
 312     return(he);
 313 }
 314
 315 /*
 316  * xdr routines for mount rpc's
 317  */
 318 int
 319 xdr_dir(XDR *xdrsp, char *dirp) {
 320         return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
 321 }
 322
 323 static void
 324 usage() {
 325         fprintf(stderr, "%s\n",
 326             "usage: rpc.umntall [-kv] [-e expire] [-h host] [-p path]");
 327         exit(1);
 328 }