umount.c revision 1.51
1 /* $NetBSD: umount.c,v 1.51 2016/06/26 03:51:28 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 1.51 2016/06/26 03:51:28 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 getaddrinfo(nfshost, NULL, &hints, &nfshost_ai); 152 } 153 154 errs = 0; 155 if (all) { 156 if ((mnts = getmntinfo(&mntbuf, ST_NOWAIT)) == 0) { 157 warn("getmntinfo"); 158 errs = 1; 159 } 160 for (errs = 0, mnts--; mnts > 0; mnts--) { 161 if (checkvfsname(mntbuf[mnts].f_fstypename, typelist)) 162 continue; 163 if (umountfs(mntbuf[mnts].f_mntonname, typelist, 164 1) != 0) 165 errs = 1; 166 } 167 } else 168 #endif /* !SMALL */ 169 for (errs = 0; *argv != NULL; ++argv) 170 if (umountfs(*argv, typelist, raw) != 0) 171 errs = 1; 172 return errs; 173 } 174 175 static int 176 umountfs(const char *name, const char **typelist, int raw) 177 { 178 #ifndef SMALL 179 enum clnt_stat clnt_stat; 180 struct timeval try; 181 CLIENT *clp; 182 char *hostp = NULL; 183 struct addrinfo *ai = NULL, hints; 184 const char *proto = NULL; 185 #endif /* !SMALL */ 186 const char *mntpt; 187 char *type, rname[MAXPATHLEN], umountprog[MAXPATHLEN]; 188 mntwhat what; 189 struct stat sb; 190 191 if (raw) { 192 mntpt = name; 193 } else { 194 195 what = MNTANY; 196 if (realpath(name, rname) != NULL) { 197 name = rname; 198 199 if (stat(name, &sb) == 0) { 200 if (S_ISBLK(sb.st_mode)) 201 what = MNTON; 202 else if (S_ISDIR(sb.st_mode)) 203 what = MNTFROM; 204 } 205 } 206 #ifdef SMALL 207 else { 208 warn("%s", name); 209 return 1; 210 } 211 #endif /* SMALL */ 212 mntpt = name; 213 214 switch (what) { 215 case MNTON: 216 if ((mntpt = getmntname(name, MNTON, &type)) == NULL) { 217 warnx("%s: not currently mounted", name); 218 return (1); 219 } 220 break; 221 case MNTFROM: 222 if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) { 223 warnx("%s: not currently mounted", mntpt); 224 return (1); 225 } 226 break; 227 default: 228 if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) { 229 name = mntpt; 230 if ((mntpt = getmntname(name, MNTON, &type)) == NULL) { 231 warnx("%s: not currently mounted", name); 232 return 1; 233 } 234 } 235 } 236 237 #ifndef SMALL 238 if (checkvfsname(type, typelist)) 239 return 1; 240 241 (void)memset(&hints, 0, sizeof hints); 242 if (!strncmp(type, MOUNT_NFS, 243 sizeof(((struct statvfs *)NULL)->f_fstypename))) { 244 char *delimp; 245 proto = getmntproto(mntpt); 246 /* look for host:mountpoint */ 247 if ((delimp = strrchr(name, ':')) != NULL) { 248 int len = delimp - name; 249 hostp = malloc(len + 1); 250 if (hostp == NULL) 251 return 1; 252 memcpy(hostp, name, len); 253 hostp[len] = 0; 254 name += len + 1; 255 getaddrinfo(hostp, NULL, &hints, &ai); 256 } 257 } 258 259 if (!namematch(ai)) 260 return 1; 261 #endif /* ! SMALL */ 262 snprintf(umountprog, sizeof(umountprog), "umount_%s", type); 263 } 264 265 #ifndef SMALL 266 if (verbose) { 267 (void)printf("%s: unmount from %s\n", name, mntpt); 268 /* put this before the test of FAKE */ 269 if (!raw) { 270 (void)printf("Trying unmount program %s\n", 271 umountprog); 272 } 273 } 274 if (fake) 275 return 0; 276 #endif /* ! SMALL */ 277 278 if (!raw) { 279 /* 280 * The only options that need to be passed on are -f 281 * and -v. 282 */ 283 char *args[3]; 284 unsigned nargs = 0; 285 286 args[nargs++] = umountprog; 287 if (fflag == MNT_FORCE) { 288 args[nargs++] = __UNCONST("-f"); 289 } 290 #ifndef SMALL 291 if (verbose) { 292 args[nargs++] = __UNCONST("-v"); 293 } 294 #endif 295 execvp(umountprog, args); 296 if (errno != ENOENT) { 297 warn("%s: execvp", umountprog); 298 } 299 } 300 301 #ifndef SMALL 302 if (verbose) 303 (void)printf("(No separate unmount program.)\n"); 304 #endif 305 306 if (unmount(mntpt, fflag) == -1) { 307 warn("%s", mntpt); 308 return 1; 309 } 310 311 #ifndef SMALL 312 if (ai != NULL && !(fflag & MNT_FORCE)) { 313 clp = clnt_create(hostp, RPCPROG_MNT, RPCMNT_VER1, proto); 314 if (clp == NULL) { 315 clnt_pcreateerror("Cannot MNT PRC"); 316 return 1; 317 } 318 clp->cl_auth = authsys_create_default(); 319 try.tv_sec = 20; 320 try.tv_usec = 0; 321 clnt_stat = clnt_call(clp, RPCMNT_UMOUNT, xdr_dir, 322 __UNCONST(name), xdr_void, NULL, try); 323 if (clnt_stat != RPC_SUCCESS) { 324 clnt_perror(clp, "Bad MNT RPC"); 325 return 1; 326 } 327 auth_destroy(clp->cl_auth); 328 clnt_destroy(clp); 329 } 330 #endif /* ! SMALL */ 331 return 0; 332 } 333 334 static char * 335 getmntname(const char *name, mntwhat what, char **type) 336 { 337 static struct statvfs *mntbuf; 338 static int mntsize; 339 int i; 340 341 if (mntbuf == NULL && 342 (mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) { 343 warn("getmntinfo"); 344 return (NULL); 345 } 346 for (i = mntsize - 1; i >= 0; i--) { 347 if ((what == MNTON) && !strcmp(mntbuf[i].f_mntfromname, name)) { 348 if (type) 349 *type = mntbuf[i].f_fstypename; 350 return (mntbuf[i].f_mntonname); 351 } 352 if ((what == MNTFROM) && !strcmp(mntbuf[i].f_mntonname, name)) { 353 if (type) 354 *type = mntbuf[i].f_fstypename; 355 return (mntbuf[i].f_mntfromname); 356 } 357 } 358 return (NULL); 359 } 360 361 #ifndef SMALL 362 static int 363 sacmp(const struct sockaddr *sa1, const struct sockaddr *sa2) 364 { 365 const void *p1, *p2; 366 size_t len; 367 368 if (sa1->sa_family != sa2->sa_family) 369 return 1; 370 371 switch (sa1->sa_family) { 372 case AF_INET: 373 p1 = &((const struct sockaddr_in *)sa1)->sin_addr; 374 p2 = &((const struct sockaddr_in *)sa2)->sin_addr; 375 len = 4; 376 break; 377 case AF_INET6: 378 p1 = &((const struct sockaddr_in6 *)sa1)->sin6_addr; 379 p2 = &((const struct sockaddr_in6 *)sa2)->sin6_addr; 380 len = 16; 381 if (((const struct sockaddr_in6 *)sa1)->sin6_scope_id != 382 ((const struct sockaddr_in6 *)sa2)->sin6_scope_id) 383 return 1; 384 break; 385 default: 386 return 1; 387 } 388 389 return memcmp(p1, p2, len); 390 } 391 392 static int 393 namematch(const struct addrinfo *ai) 394 { 395 struct addrinfo *aip; 396 397 if (nfshost == NULL || nfshost_ai == NULL) 398 return (1); 399 400 while (ai != NULL) { 401 aip = nfshost_ai; 402 while (aip != NULL) { 403 if (sacmp(ai->ai_addr, aip->ai_addr) == 0) 404 return 1; 405 aip = aip->ai_next; 406 } 407 ai = ai->ai_next; 408 } 409 410 return 0; 411 } 412 413 /* 414 * xdr routines for mount rpc's 415 */ 416 static int 417 xdr_dir(XDR *xdrsp, char *dirp) 418 { 419 return xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN); 420 } 421 422 static const char * 423 getmntproto(const char *name) 424 { 425 struct nfs_args nfsargs; 426 struct sockaddr_storage ss; 427 428 nfsargs.sotype = SOCK_DGRAM; 429 nfsargs.addr = (struct sockaddr *)&ss; 430 nfsargs.addrlen = sizeof(ss); 431 (void)mount("nfs", name, MNT_GETARGS, &nfsargs, sizeof(nfsargs)); 432 return nfsargs.sotype == SOCK_STREAM ? "tcp" : "udp"; 433 } 434 #endif /* !SMALL */ 435 436 static void 437 usage(void) 438 { 439 #ifdef SMALL 440 (void)fprintf(stderr, 441 "Usage: %s [-fR] special | node\n", getprogname()); 442 #else 443 (void)fprintf(stderr, 444 "Usage: %s [-fvFR] [-t fstypelist] special | node\n" 445 "\t %s -a[fvF] [-h host] [-t fstypelist]\n", getprogname(), 446 getprogname()); 447 #endif /* SMALL */ 448 exit(1); 449 } 450
Indexes created Tue Sep 30 11:09:46 GMT 2025