umount.c revision 1.47
1 /* $NetBSD: umount.c,v 1.47 2013/07/02 01:39:17 christos 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 1.47 2013/07/02 01:39:17 christos 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 <fstab.h> 63 #include <stdio.h> 64 #include <stdlib.h> 65 #include <string.h> 66 #include <unistd.h> 67 68 typedef enum { MNTANY, MNTON, MNTFROM } mntwhat; 69 70 #ifndef SMALL 71 #include "mountprog.h" 72 73 static int fake, verbose; 74 static char *nfshost; 75 static struct addrinfo *nfshost_ai = NULL; 76 77 static int namematch(const struct addrinfo *); 78 static int sacmp(const struct sockaddr *, const struct sockaddr *); 79 static int xdr_dir(XDR *, char *); 80 static const char *getmntproto(const char *); 81 #endif /* !SMALL */ 82 83 static int fflag; 84 static char *getmntname(const char *, mntwhat, char **); 85 static int umountfs(const char *, const char **, int); 86 static void usage(void) __dead; 87 88 int 89 main(int argc, char *argv[]) 90 { 91 int ch, errs, all = 0, raw = 0; 92 #ifndef SMALL 93 int mnts; 94 struct statvfs *mntbuf; 95 struct addrinfo hints; 96 #endif /* SMALL */ 97 const char **typelist = NULL; 98 99 /* Start disks transferring immediately. */ 100 sync(); 101 102 #ifdef SMALL 103 #define OPTS "fR" 104 #else 105 #define OPTS "AaFfh:Rt:v" 106 #endif 107 while ((ch = getopt(argc, argv, OPTS)) != -1) 108 switch (ch) { 109 case 'f': 110 fflag = MNT_FORCE; 111 break; 112 case 'R': 113 raw = 1; 114 break; 115 #ifndef SMALL 116 case 'A': 117 case 'a': 118 all = 1; 119 break; 120 case 'F': 121 fake = 1; 122 break; 123 case 'h': /* -h implies -A. */ 124 all = 1; 125 nfshost = optarg; 126 break; 127 case 't': 128 if (typelist != NULL) 129 errx(1, "only one -t option may be specified."); 130 typelist = makevfslist(optarg); 131 break; 132 case 'v': 133 verbose = 1; 134 break; 135 #endif /* !SMALL */ 136 default: 137 usage(); 138 /* NOTREACHED */ 139 } 140 argc -= optind; 141 argv += optind; 142 143 if ((argc == 0 && !all) || (argc != 0 && all) || (all && raw)) 144 usage(); 145 146 #ifndef SMALL 147 /* -h implies "-t nfs" if no -t flag. */ 148 if ((nfshost != NULL) && (typelist == NULL)) 149 typelist = makevfslist("nfs"); 150 151 if (nfshost != NULL) { 152 memset(&hints, 0, sizeof hints); 153 getaddrinfo(nfshost, NULL, &hints, &nfshost_ai); 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]; 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", rname); 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 getaddrinfo(hostp, NULL, &hints, &ai); 258 } 259 } 260 261 if (!namematch(ai)) 262 return 1; 263 #endif /* ! SMALL */ 264 } 265 266 #ifndef SMALL 267 if (verbose) 268 (void)printf("%s: unmount from %s\n", name, mntpt); 269 if (fake) 270 return 0; 271 #endif /* ! SMALL */ 272 273 if (unmount(mntpt, fflag) == -1) { 274 warn("%s", mntpt); 275 return 1; 276 } 277 278 #ifndef SMALL 279 if (ai != NULL && !(fflag & MNT_FORCE)) { 280 clp = clnt_create(hostp, RPCPROG_MNT, RPCMNT_VER1, proto); 281 if (clp == NULL) { 282 clnt_pcreateerror("Cannot MNT PRC"); 283 return 1; 284 } 285 clp->cl_auth = authsys_create_default(); 286 try.tv_sec = 20; 287 try.tv_usec = 0; 288 clnt_stat = clnt_call(clp, RPCMNT_UMOUNT, xdr_dir, 289 __UNCONST(name), xdr_void, NULL, try); 290 if (clnt_stat != RPC_SUCCESS) { 291 clnt_perror(clp, "Bad MNT RPC"); 292 return 1; 293 } 294 auth_destroy(clp->cl_auth); 295 clnt_destroy(clp); 296 } 297 #endif /* ! SMALL */ 298 return 0; 299 } 300 301 static char * 302 getmntname(const char *name, mntwhat what, char **type) 303 { 304 static struct statvfs *mntbuf; 305 static int mntsize; 306 int i; 307 308 if (mntbuf == NULL && 309 (mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) { 310 warn("getmntinfo"); 311 return (NULL); 312 } 313 for (i = mntsize - 1; i >= 0; i--) { 314 if ((what == MNTON) && !strcmp(mntbuf[i].f_mntfromname, name)) { 315 if (type) 316 *type = mntbuf[i].f_fstypename; 317 return (mntbuf[i].f_mntonname); 318 } 319 if ((what == MNTFROM) && !strcmp(mntbuf[i].f_mntonname, name)) { 320 if (type) 321 *type = mntbuf[i].f_fstypename; 322 return (mntbuf[i].f_mntfromname); 323 } 324 } 325 return (NULL); 326 } 327 328 #ifndef SMALL 329 static int 330 sacmp(const struct sockaddr *sa1, const struct sockaddr *sa2) 331 { 332 const void *p1, *p2; 333 size_t len; 334 335 if (sa1->sa_family != sa2->sa_family) 336 return 1; 337 338 switch (sa1->sa_family) { 339 case AF_INET: 340 p1 = &((const struct sockaddr_in *)sa1)->sin_addr; 341 p2 = &((const struct sockaddr_in *)sa2)->sin_addr; 342 len = 4; 343 break; 344 case AF_INET6: 345 p1 = &((const struct sockaddr_in6 *)sa1)->sin6_addr; 346 p2 = &((const struct sockaddr_in6 *)sa2)->sin6_addr; 347 len = 16; 348 if (((const struct sockaddr_in6 *)sa1)->sin6_scope_id != 349 ((const struct sockaddr_in6 *)sa2)->sin6_scope_id) 350 return 1; 351 break; 352 default: 353 return 1; 354 } 355 356 return memcmp(p1, p2, len); 357 } 358 359 static int 360 namematch(const struct addrinfo *ai) 361 { 362 struct addrinfo *aip; 363 364 if (nfshost == NULL || nfshost_ai == NULL) 365 return (1); 366 367 while (ai != NULL) { 368 aip = nfshost_ai; 369 while (aip != NULL) { 370 if (sacmp(ai->ai_addr, aip->ai_addr) == 0) 371 return 1; 372 aip = aip->ai_next; 373 } 374 ai = ai->ai_next; 375 } 376 377 return 0; 378 } 379 380 /* 381 * xdr routines for mount rpc's 382 */ 383 static int 384 xdr_dir(XDR *xdrsp, char *dirp) 385 { 386 return xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN); 387 } 388 389 static const char * 390 getmntproto(const char *name) 391 { 392 struct nfs_args nfsargs; 393 struct sockaddr_storage ss; 394 395 nfsargs.sotype = SOCK_DGRAM; 396 nfsargs.addr = (struct sockaddr *)&ss; 397 nfsargs.addrlen = sizeof(ss); 398 (void)mount("nfs", name, MNT_GETARGS, &nfsargs, sizeof(nfsargs)); 399 return nfsargs.sotype == SOCK_STREAM ? "tcp" : "udp"; 400 } 401 #endif /* !SMALL */ 402 403 static void 404 usage(void) 405 { 406 #ifdef SMALL 407 (void)fprintf(stderr, 408 "Usage: %s [-fR] special | node\n", getprogname()); 409 #else 410 (void)fprintf(stderr, 411 "Usage: %s [-fvFR] [-t fstypelist] special | node\n" 412 "\t %s -a[fvF] [-h host] [-t fstypelist]\n", getprogname(), 413 getprogname()); 414 #endif /* SMALL */ 415 exit(1); 416 } 417
Indexes created Thu Oct 02 01:09:59 GMT 2025