umount.c revision 35939
1/*- 2 * Copyright (c) 1980, 1989, 1993 3 * The Regents of the University of California. 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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#ifndef lint 35static char copyright[] = 36"@(#) Copyright (c) 1980, 1989, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif /* not lint */ 39 40#ifndef lint 41static char sccsid[] = "@(#)umount.c 8.8 (Berkeley) 5/8/95"; 42#endif /* not lint */ 43 44#include <sys/param.h> 45#include <sys/stat.h> 46#include <sys/mount.h> 47#include <sys/time.h> 48#include <sys/socket.h> 49#include <sys/socketvar.h> 50 51#include <netdb.h> 52#include <rpc/rpc.h> 53#include <rpc/pmap_clnt.h> 54#include <rpc/pmap_prot.h> 55#include <nfs/rpcv2.h> 56 57#include <err.h> 58#include <fstab.h> 59#include <stdio.h> 60#include <stdlib.h> 61#include <string.h> 62#include <unistd.h> 63 64typedef enum { MNTON, MNTFROM } mntwhat; 65 66int fake, fflag, vflag; 67char *nfshost; 68 69int checkvfsname __P((const char *, char **)); 70char *getmntname __P((char *, mntwhat, char **)); 71char **makevfslist __P((char *)); 72int selected __P((int)); 73int namematch __P((struct hostent *)); 74int umountall __P((char **)); 75int umountfs __P((char *, char **)); 76void usage __P((void)); 77int xdr_dir __P((XDR *, char *)); 78 79int 80main(argc, argv) 81 int argc; 82 char *argv[]; 83{ 84 int all, ch, errs, mnts; 85 char **typelist = NULL; 86 struct statfs *mntbuf; 87 88 /* Start disks transferring immediately. */ 89 sync(); 90 91 all = 0; 92 while ((ch = getopt(argc, argv, "AaFfh:t:v")) != -1) 93 switch (ch) { 94 case 'A': 95 all = 2; 96 break; 97 case 'a': 98 all = 1; 99 break; 100 case 'F': 101 fake = 1; 102 break; 103 case 'f': 104 fflag = MNT_FORCE; 105 break; 106 case 'h': /* -h implies -A. */ 107 all = 2; 108 nfshost = optarg; 109 break; 110 case 't': 111 if (typelist != NULL) 112 errx(1, "only one -t option may be specified."); 113 typelist = makevfslist(optarg); 114 break; 115 case 'v': 116 vflag = 1; 117 break; 118 default: 119 usage(); 120 /* NOTREACHED */ 121 } 122 argc -= optind; 123 argv += optind; 124 125 if (argc == 0 && !all || argc != 0 && all) 126 usage(); 127 128 /* -h implies "-t nfs" if no -t flag. */ 129 if ((nfshost != NULL) && (typelist == NULL)) 130 typelist = makevfslist("nfs"); 131 132 switch (all) { 133 case 2: 134 if ((mnts = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) { 135 warn("getmntinfo"); 136 errs = 1; 137 break; 138 } 139 for (errs = 0, mnts--; mnts > 0; mnts--) { 140 if (checkvfsname(mntbuf[mnts].f_fstypename, typelist)) 141 continue; 142 if (umountfs(mntbuf[mnts].f_mntonname, typelist) != 0) 143 errs = 1; 144 } 145 break; 146 case 1: 147 if (setfsent() == 0) 148 err(1, "%s", _PATH_FSTAB); 149 errs = umountall(typelist); 150 break; 151 case 0: 152 for (errs = 0; *argv != NULL; ++argv) 153 if (umountfs(*argv, typelist) != 0) 154 errs = 1; 155 break; 156 } 157 exit(errs); 158} 159 160int 161umountall(typelist) 162 char **typelist; 163{ 164 struct fstab *fs; 165 int rval, type; 166 char *cp; 167 struct vfsconf vfc; 168 169 while ((fs = getfsent()) != NULL) { 170 /* Ignore the root. */ 171 if (strcmp(fs->fs_file, "/") == 0) 172 continue; 173 /* 174 * !!! 175 * Historic practice: ignore unknown FSTAB_* fields. 176 */ 177 if (strcmp(fs->fs_type, FSTAB_RW) && 178 strcmp(fs->fs_type, FSTAB_RO) && 179 strcmp(fs->fs_type, FSTAB_RQ)) 180 continue; 181 /* If an unknown file system type, complain. */ 182 if (getvfsbyname(fs->fs_vfstype, &vfc) < 0) { 183 warnx("%s: unknown mount type", fs->fs_vfstype); 184 continue; 185 } 186 if (checkvfsname(fs->fs_vfstype, typelist)) 187 continue; 188 189 /* 190 * We want to unmount the file systems in the reverse order 191 * that they were mounted. So, we save off the file name 192 * in some allocated memory, and then call recursively. 193 */ 194 if ((cp = malloc((size_t)strlen(fs->fs_file) + 1)) == NULL) 195 err(1, NULL); 196 (void)strcpy(cp, fs->fs_file); 197 rval = umountall(typelist); 198 return (umountfs(cp, typelist) || rval); 199 } 200 return (0); 201} 202 203int 204umountfs(name, typelist) 205 char *name; 206 char **typelist; 207{ 208 enum clnt_stat clnt_stat; 209 struct hostent *hp; 210 struct sockaddr_in saddr; 211 struct stat sb; 212 struct timeval pertry, try; 213 CLIENT *clp; 214 int so; 215 char *type, *delimp, *hostp, *mntpt, *origname, rname[MAXPATHLEN]; 216 217 if (realpath(name, rname) == NULL) { 218 /* Continue and let the system call check it... */ 219 strcpy(rname, name); 220 } 221 222 origname = name; 223 if (stat(name, &sb) < 0) { 224 mntpt = rname; 225 if ((getmntname(rname, MNTFROM, &type) == NULL) && 226 ((mntpt = getmntname(name, MNTON, &type)) == NULL)) { 227 warnx("%s: not currently mounted", name); 228 return (1); 229 } 230 } else if (S_ISBLK(sb.st_mode)) { 231 if ((mntpt = getmntname(name, MNTON, &type)) == NULL) { 232 warnx("%s: not currently mounted", name); 233 return (1); 234 } 235 } else if (S_ISDIR(sb.st_mode)) { 236 mntpt = rname; 237 if (getmntname(mntpt, MNTFROM, &type) == NULL) { 238 warnx("%s: not currently mounted", name); 239 return (1); 240 } 241 } else { 242 warnx("%s: not a directory or special device", name); 243 return (1); 244 } 245 name = rname; 246 247 if (checkvfsname(type, typelist)) 248 return (1); 249 250 hp = NULL; 251 if (!strcmp(type, "nfs")) { 252 if ((delimp = strchr(name, '@')) != NULL) { 253 hostp = delimp + 1; 254 *delimp = '\0'; 255 hp = gethostbyname(hostp); 256 *delimp = '@'; 257 } else if ((delimp = strchr(name, ':')) != NULL) { 258 *delimp = '\0'; 259 hostp = name; 260 hp = gethostbyname(hostp); 261 name = delimp + 1; 262 *delimp = ':'; 263 } 264 } 265 266 if (!namematch(hp)) 267 return (1); 268 269 if (vflag) 270 (void)printf("%s: unmount from %s\n", origname, mntpt); 271 if (fake) 272 return (0); 273 274 if (unmount(mntpt, fflag) < 0) { 275 warn("%s", mntpt); 276 return (1); 277 } 278 279 if ((hp != NULL) && !(fflag & MNT_FORCE)) { 280 *delimp = '\0'; 281 memset(&saddr, 0, sizeof(saddr)); 282 saddr.sin_family = AF_INET; 283 saddr.sin_port = 0; 284 memmove(&saddr.sin_addr, hp->h_addr, 285 MIN(hp->h_length, sizeof(saddr.sin_addr))); 286 pertry.tv_sec = 3; 287 pertry.tv_usec = 0; 288 so = RPC_ANYSOCK; 289 if ((clp = clntudp_create(&saddr, 290 RPCPROG_MNT, RPCMNT_VER1, pertry, &so)) == NULL) { 291 clnt_pcreateerror("Cannot MNT PRC"); 292 return (1); 293 } 294 clp->cl_auth = authunix_create_default(); 295 try.tv_sec = 20; 296 try.tv_usec = 0; 297 clnt_stat = clnt_call(clp, 298 RPCMNT_UMOUNT, xdr_dir, name, xdr_void, (caddr_t)0, try); 299 if (clnt_stat != RPC_SUCCESS) { 300 clnt_perror(clp, "Bad MNT RPC"); 301 return (1); 302 } 303 auth_destroy(clp->cl_auth); 304 clnt_destroy(clp); 305 } 306 return (0); 307} 308 309char * 310getmntname(name, what, type) 311 char *name; 312 mntwhat what; 313 char **type; 314{ 315 static struct statfs *mntbuf; 316 static int mntsize; 317 int i; 318 319 if (mntbuf == NULL && 320 (mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) { 321 warn("getmntinfo"); 322 return (NULL); 323 } 324 for (i = 0; i < mntsize; i++) { 325 if ((what == MNTON) && !strcmp(mntbuf[i].f_mntfromname, name)) { 326 if (type) 327 *type = mntbuf[i].f_fstypename; 328 return (mntbuf[i].f_mntonname); 329 } 330 if ((what == MNTFROM) && !strcmp(mntbuf[i].f_mntonname, name)) { 331 if (type) 332 *type = mntbuf[i].f_fstypename; 333 return (mntbuf[i].f_mntfromname); 334 } 335 } 336 return (NULL); 337} 338 339int 340namematch(hp) 341 struct hostent *hp; 342{ 343 char *cp, **np; 344 345 if ((hp == NULL) || (nfshost == NULL)) 346 return (1); 347 348 if (strcasecmp(nfshost, hp->h_name) == 0) 349 return (1); 350 351 if ((cp = strchr(hp->h_name, '.')) != NULL) { 352 *cp = '\0'; 353 if (strcasecmp(nfshost, hp->h_name) == 0) 354 return (1); 355 } 356 for (np = hp->h_aliases; *np; np++) { 357 if (strcasecmp(nfshost, *np) == 0) 358 return (1); 359 if ((cp = strchr(*np, '.')) != NULL) { 360 *cp = '\0'; 361 if (strcasecmp(nfshost, *np) == 0) 362 return (1); 363 } 364 } 365 return (0); 366} 367 368/* 369 * xdr routines for mount rpc's 370 */ 371int 372xdr_dir(xdrsp, dirp) 373 XDR *xdrsp; 374 char *dirp; 375{ 376 return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN)); 377} 378 379void 380usage() 381{ 382 (void)fprintf(stderr, "%s\n%s\n", 383 "usage: umount [-fv] special | node", 384 " umount -a | -A [-fv] [-h host] [-t type]"); 385 exit(1); 386} 387