umount.c revision 1.52
1 /* $NetBSD: umount.c,v 1.52 2016/06/26 04:01:30 dholland Exp $ */ 2 3 /*- 4 * Copyright (c) 1980, 1989, 1993 5 * The Regents of the University of California. 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 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1980, 1989, 1993\ 35 The Regents of the University of California. All rights reserved."); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)umount.c 8.8 (Berkeley) 5/8/95"; 41 #else 42 __RCSID("$NetBSD: umount.c,v 1.52 2016/06/26 04:01:30 dholland Exp $"); 43 #endif 44 #endif /* not lint */ 45 46 #include <sys/param.h> 47 #include <sys/stat.h> 48 #include <sys/mount.h> 49 #include <sys/time.h> 50 #ifndef SMALL 51 #include <sys/socket.h> 52 53 #include <netdb.h> 54 #include <rpc/rpc.h> 55 #include <rpc/pmap_clnt.h> 56 #include <rpc/pmap_prot.h> 57 #include <nfs/rpcv2.h> 58 #include <nfs/nfsmount.h> 59 #endif /* !SMALL */ 60 61 #include <err.h> 62 #include <errno.h> 63 #include <fstab.h> 64 #include <stdio.h> 65 #include <stdlib.h> 66 #include <string.h> 67 #include <unistd.h> 68 69 typedef enum { MNTANY, MNTON, MNTFROM } mntwhat; 70 71 #ifndef SMALL 72 #include "mountprog.h" 73 74 static int fake, verbose; 75 static char *nfshost; 76 static struct addrinfo *nfshost_ai = NULL; 77 78 static int namematch(const struct addrinfo *); 79 static int sacmp(const struct sockaddr *, const struct sockaddr *); 80 static int xdr_dir(XDR *, char *); 81 static const char *getmntproto(const char *); 82 #endif /* !SMALL */ 83 84 static int fflag; 85 static char *getmntname(const char *, mntwhat, char **); 86 static int umountfs(const char *, const char **, int); 87 static void usage(void) __dead; 88 89 int 90 main(int argc, char *argv[]) 91 { 92 int ch, errs, all = 0, raw = 0; 93 #ifndef SMALL 94 int mnts; 95 struct statvfs *mntbuf; 96 struct addrinfo hints; 97 #endif /* SMALL */ 98 const char **typelist = NULL; 99 100 #ifdef SMALL 101 #define OPTS "fR" 102 #else 103 #define OPTS "AaFfh:Rt:v" 104 #endif 105 while ((ch = getopt(argc, argv, OPTS)) != -1) 106 switch (ch) { 107 case 'f': 108 fflag = MNT_FORCE; 109 break; 110 case 'R': 111 raw = 1; 112 break; 113 #ifndef SMALL 114 case 'A': 115 case 'a': 116 all = 1; 117 break; 118 case 'F': 119 fake = 1; 120 break; 121 case 'h': /* -h implies -A. */ 122 all = 1; 123 nfshost = optarg; 124 break; 125 case 't': 126 if (typelist != NULL) 127 errx(1, "only one -t option may be specified."); 128 typelist = makevfslist(optarg); 129 break; 130 case 'v': 131 verbose = 1; 132 break; 133 #endif /* !SMALL */ 134 default: 135 usage(); 136 /* NOTREACHED */ 137 } 138 argc -= optind; 139 argv += optind; 140 141 if ((argc == 0 && !all) || (argc != 0 && all) || (all && raw)) 142 usage(); 143 144 #ifndef SMALL 145 /* -h implies "-t nfs" if no -t flag. */ 146 if ((nfshost != NULL) && (typelist == NULL)) 147 typelist = makevfslist("nfs"); 148 149 if (nfshost != NULL) { 150 memset(&hints, 0, sizeof hints); 151 if (getaddrinfo(nfshost, NULL, &hints, &nfshost_ai) != 0) { 152 nfshost_ai = NULL; 153 } 154 } 155 156 errs = 0; 157 if (all) { 158 if ((mnts = getmntinfo(&mntbuf, ST_NOWAIT)) == 0) { 159 warn("getmntinfo"); 160 errs = 1; 161 } 162 for (errs = 0, mnts--; mnts > 0; mnts--) { 163 if (checkvfsname(mntbuf[mnts].f_fstypename, typelist)) 164 continue; 165 if (umountfs(mntbuf[mnts].f_mntonname, typelist, 166 1) != 0) 167 errs = 1; 168 } 169 } else 170 #endif /* !SMALL */ 171 for (errs = 0; *argv != NULL; ++argv) 172 if (umountfs(*argv, typelist, raw) != 0) 173 errs = 1; 174 return errs; 175 } 176 177 static int 178 umountfs(const char *name, const char **typelist, int raw) 179 { 180 #ifndef SMALL 181 enum clnt_stat clnt_stat; 182 struct timeval try; 183 CLIENT *clp; 184 char *hostp = NULL; 185 struct addrinfo *ai = NULL, hints; 186 const char *proto = NULL; 187 #endif /* !SMALL */ 188 const char *mntpt; 189 char *type, rname[MAXPATHLEN], umountprog[MAXPATHLEN]; 190 mntwhat what; 191 struct stat sb; 192 193 if (raw) { 194 mntpt = name; 195 } else { 196 197 what = MNTANY; 198 if (realpath(name, rname) != NULL) { 199 name = rname; 200 201 if (stat(name, &sb) == 0) { 202 if (S_ISBLK(sb.st_mode)) 203 what = MNTON; 204 else if (S_ISDIR(sb.st_mode)) 205 what = MNTFROM; 206 } 207 } 208 #ifdef SMALL 209 else { 210 warn("%s", name); 211 return 1; 212 } 213 #endif /* SMALL */ 214 mntpt = name; 215 216 switch (what) { 217 case MNTON: 218 if ((mntpt = getmntname(name, MNTON, &type)) == NULL) { 219 warnx("%s: not currently mounted", name); 220 return (1); 221 } 222 break; 223 case MNTFROM: 224 if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) { 225 warnx("%s: not currently mounted", mntpt); 226 return (1); 227 } 228 break; 229 default: 230 if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) { 231 name = mntpt; 232 if ((mntpt = getmntname(name, MNTON, &type)) == NULL) { 233 warnx("%s: not currently mounted", name); 234 return 1; 235 } 236 } 237 } 238 239 #ifndef SMALL 240 if (checkvfsname(type, typelist)) 241 return 1; 242 243 (void)memset(&hints, 0, sizeof hints); 244 if (!strncmp(type, MOUNT_NFS, 245 sizeof(((struct statvfs *)NULL)->f_fstypename))) { 246 char *delimp; 247 proto = getmntproto(mntpt); 248 /* look for host:mountpoint */ 249 if ((delimp = strrchr(name, ':')) != NULL) { 250 int len = delimp - name; 251 hostp = malloc(len + 1); 252 if (hostp == NULL) 253 return 1; 254 memcpy(hostp, name, len); 255 hostp[len] = 0; 256 name += len + 1; 257 if (getaddrinfo(hostp, NULL, &hints, &ai) != 0) 258 ai = NULL; 259 } 260 } 261 262 if (!namematch(ai)) 263 return 1; 264 #endif /* ! SMALL */ 265 snprintf(umountprog, sizeof(umountprog), "umount_%s", type); 266 } 267 268 #ifndef SMALL 269 if (verbose) { 270 (void)printf("%s: unmount from %s\n", name, mntpt); 271 /* put this before the test of FAKE */ 272 if (!raw) { 273 (void)printf("Trying unmount program %s\n", 274 umountprog); 275 } 276 } 277 if (fake) 278 return 0; 279 #endif /* ! SMALL */ 280 281 if (!raw) { 282 /* 283 * The only options that need to be passed on are -f 284 * and -v. 285 */ 286 char *args[3]; 287 unsigned nargs = 0; 288 289 args[nargs++] = umountprog; 290 if (fflag == MNT_FORCE) { 291 args[nargs++] = __UNCONST("-f"); 292 } 293 #ifndef SMALL 294 if (verbose) { 295 args[nargs++] = __UNCONST("-v"); 296 } 297 #endif 298 execvp(umountprog, args); 299 if (errno != ENOENT) { 300 warn("%s: execvp", umountprog); 301 } 302 } 303 304 #ifndef SMALL 305 if (verbose) 306 (void)printf("(No separate unmount program.)\n"); 307 #endif 308 309 if (unmount(mntpt, fflag) == -1) { 310 warn("%s", mntpt); 311 return 1; 312 } 313 314 #ifndef SMALL 315 if (ai != NULL && !(fflag & MNT_FORCE)) { 316 clp = clnt_create(hostp, RPCPROG_MNT, RPCMNT_VER1, proto); 317 if (clp == NULL) { 318 clnt_pcreateerror("Cannot MNT PRC"); 319 return 1; 320 } 321 clp->cl_auth = authsys_create_default(); 322 try.tv_sec = 20; 323 try.tv_usec = 0; 324 clnt_stat = clnt_call(clp, RPCMNT_UMOUNT, xdr_dir, 325 __UNCONST(name), xdr_void, NULL, try); 326 if (clnt_stat != RPC_SUCCESS) { 327 clnt_perror(clp, "Bad MNT RPC"); 328 return 1; 329 } 330 auth_destroy(clp->cl_auth); 331 clnt_destroy(clp); 332 } 333 #endif /* ! SMALL */ 334 return 0; 335 } 336 337 static char * 338 getmntname(const char *name, mntwhat what, char **type) 339 { 340 static struct statvfs *mntbuf; 341 static int mntsize; 342 int i; 343 344 if (mntbuf == NULL && 345 (mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) { 346 warn("getmntinfo"); 347 return (NULL); 348 } 349 for (i = mntsize - 1; i >= 0; i--) { 350 if ((what == MNTON) && !strcmp(mntbuf[i].f_mntfromname, name)) { 351 if (type) 352 *type = mntbuf[i].f_fstypename; 353 return (mntbuf[i].f_mntonname); 354 } 355 if ((what == MNTFROM) && !strcmp(mntbuf[i].f_mntonname, name)) { 356 if (type) 357 *type = mntbuf[i].f_fstypename; 358 return (mntbuf[i].f_mntfromname); 359 } 360 } 361 return (NULL); 362 } 363 364 #ifndef SMALL 365 static int 366 sacmp(const struct sockaddr *sa1, const struct sockaddr *sa2) 367 { 368 const void *p1, *p2; 369 size_t len; 370 371 if (sa1->sa_family != sa2->sa_family) 372 return 1; 373 374 switch (sa1->sa_family) { 375 case AF_INET: 376 p1 = &((const struct sockaddr_in *)sa1)->sin_addr; 377 p2 = &((const struct sockaddr_in *)sa2)->sin_addr; 378 len = 4; 379 break; 380 case AF_INET6: 381 p1 = &((const struct sockaddr_in6 *)sa1)->sin6_addr; 382 p2 = &((const struct sockaddr_in6 *)sa2)->sin6_addr; 383 len = 16; 384 if (((const struct sockaddr_in6 *)sa1)->sin6_scope_id != 385 ((const struct sockaddr_in6 *)sa2)->sin6_scope_id) 386 return 1; 387 break; 388 default: 389 return 1; 390 } 391 392 return memcmp(p1, p2, len); 393 } 394 395 static int 396 namematch(const struct addrinfo *ai) 397 { 398 struct addrinfo *aip; 399 400 if (nfshost == NULL || nfshost_ai == NULL) 401 return (1); 402 403 while (ai != NULL) { 404 aip = nfshost_ai; 405 while (aip != NULL) { 406 if (sacmp(ai->ai_addr, aip->ai_addr) == 0) 407 return 1; 408 aip = aip->ai_next; 409 } 410 ai = ai->ai_next; 411 } 412 413 return 0; 414 } 415 416 /* 417 * xdr routines for mount rpc's 418 */ 419 static int 420 xdr_dir(XDR *xdrsp, char *dirp) 421 { 422 return xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN); 423 } 424 425 static const char * 426 getmntproto(const char *name) 427 { 428 struct nfs_args nfsargs; 429 struct sockaddr_storage ss; 430 431 nfsargs.sotype = SOCK_DGRAM; 432 nfsargs.addr = (struct sockaddr *)&ss; 433 nfsargs.addrlen = sizeof(ss); 434 (void)mount("nfs", name, MNT_GETARGS, &nfsargs, sizeof(nfsargs)); 435 return nfsargs.sotype == SOCK_STREAM ? "tcp" : "udp"; 436 } 437 #endif /* !SMALL */ 438 439 static void 440 usage(void) 441 { 442 #ifdef SMALL 443 (void)fprintf(stderr, 444 "Usage: %s [-fR] special | node\n", getprogname()); 445 #else 446 (void)fprintf(stderr, 447 "Usage: %s [-fvFR] [-t fstypelist] special | node\n" 448 "\t %s -a[fvF] [-h host] [-t fstypelist]\n", getprogname(), 449 getprogname()); 450 #endif /* SMALL */ 451 exit(1); 452 } 453
Indexes created Tue Sep 30 17:09:57 GMT 2025