umount.c revision 1.49
1 /* $NetBSD: umount.c,v 1.49 2016/06/26 03:05:52 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 1.49 2016/06/26 03:05:52 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 <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 #ifdef SMALL 100 #define OPTS "fR" 101 #else 102 #define OPTS "AaFfh:Rt:v" 103 #endif 104 while ((ch = getopt(argc, argv, OPTS)) != -1) 105 switch (ch) { 106 case 'f': 107 fflag = MNT_FORCE; 108 break; 109 case 'R': 110 raw = 1; 111 break; 112 #ifndef SMALL 113 case 'A': 114 case 'a': 115 all = 1; 116 break; 117 case 'F': 118 fake = 1; 119 break; 120 case 'h': /* -h implies -A. */ 121 all = 1; 122 nfshost = optarg; 123 break; 124 case 't': 125 if (typelist != NULL) 126 errx(1, "only one -t option may be specified."); 127 typelist = makevfslist(optarg); 128 break; 129 case 'v': 130 verbose = 1; 131 break; 132 #endif /* !SMALL */ 133 default: 134 usage(); 135 /* NOTREACHED */ 136 } 137 argc -= optind; 138 argv += optind; 139 140 if ((argc == 0 && !all) || (argc != 0 && all) || (all && raw)) 141 usage(); 142 143 #ifndef SMALL 144 /* -h implies "-t nfs" if no -t flag. */ 145 if ((nfshost != NULL) && (typelist == NULL)) 146 typelist = makevfslist("nfs"); 147 148 if (nfshost != NULL) { 149 memset(&hints, 0, sizeof hints); 150 getaddrinfo(nfshost, NULL, &hints, &nfshost_ai); 151 } 152 153 errs = 0; 154 if (all) { 155 if ((mnts = getmntinfo(&mntbuf, ST_NOWAIT)) == 0) { 156 warn("getmntinfo"); 157 errs = 1; 158 } 159 for (errs = 0, mnts--; mnts > 0; mnts--) { 160 if (checkvfsname(mntbuf[mnts].f_fstypename, typelist)) 161 continue; 162 if (umountfs(mntbuf[mnts].f_mntonname, typelist, 163 1) != 0) 164 errs = 1; 165 } 166 } else 167 #endif /* !SMALL */ 168 for (errs = 0; *argv != NULL; ++argv) 169 if (umountfs(*argv, typelist, raw) != 0) 170 errs = 1; 171 return errs; 172 } 173 174 static int 175 umountfs(const char *name, const char **typelist, int raw) 176 { 177 #ifndef SMALL 178 enum clnt_stat clnt_stat; 179 struct timeval try; 180 CLIENT *clp; 181 char *hostp = NULL; 182 struct addrinfo *ai = NULL, hints; 183 const char *proto = NULL; 184 #endif /* !SMALL */ 185 const char *mntpt; 186 char *type, rname[MAXPATHLEN]; 187 mntwhat what; 188 struct stat sb; 189 190 if (raw) { 191 mntpt = name; 192 } else { 193 194 what = MNTANY; 195 if (realpath(name, rname) != NULL) { 196 name = rname; 197 198 if (stat(name, &sb) == 0) { 199 if (S_ISBLK(sb.st_mode)) 200 what = MNTON; 201 else if (S_ISDIR(sb.st_mode)) 202 what = MNTFROM; 203 } 204 } 205 #ifdef SMALL 206 else { 207 warn("%s", name); 208 return 1; 209 } 210 #endif /* SMALL */ 211 mntpt = name; 212 213 switch (what) { 214 case MNTON: 215 if ((mntpt = getmntname(name, MNTON, &type)) == NULL) { 216 warnx("%s: not currently mounted", name); 217 return (1); 218 } 219 break; 220 case MNTFROM: 221 if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) { 222 warnx("%s: not currently mounted", mntpt); 223 return (1); 224 } 225 break; 226 default: 227 if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) { 228 name = mntpt; 229 if ((mntpt = getmntname(name, MNTON, &type)) == NULL) { 230 warnx("%s: not currently mounted", name); 231 return 1; 232 } 233 } 234 } 235 236 #ifndef SMALL 237 if (checkvfsname(type, typelist)) 238 return 1; 239 240 (void)memset(&hints, 0, sizeof hints); 241 if (!strncmp(type, MOUNT_NFS, 242 sizeof(((struct statvfs *)NULL)->f_fstypename))) { 243 char *delimp; 244 proto = getmntproto(mntpt); 245 /* look for host:mountpoint */ 246 if ((delimp = strrchr(name, ':')) != NULL) { 247 int len = delimp - name; 248 hostp = malloc(len + 1); 249 if (hostp == NULL) 250 return 1; 251 memcpy(hostp, name, len); 252 hostp[len] = 0; 253 name += len + 1; 254 getaddrinfo(hostp, NULL, &hints, &ai); 255 } 256 } 257 258 if (!namematch(ai)) 259 return 1; 260 #endif /* ! SMALL */ 261 } 262 263 #ifndef SMALL 264 if (verbose) 265 (void)printf("%s: unmount from %s\n", name, mntpt); 266 if (fake) 267 return 0; 268 #endif /* ! SMALL */ 269 270 if (unmount(mntpt, fflag) == -1) { 271 warn("%s", mntpt); 272 return 1; 273 } 274 275 #ifndef SMALL 276 if (ai != NULL && !(fflag & MNT_FORCE)) { 277 clp = clnt_create(hostp, RPCPROG_MNT, RPCMNT_VER1, proto); 278 if (clp == NULL) { 279 clnt_pcreateerror("Cannot MNT PRC"); 280 return 1; 281 } 282 clp->cl_auth = authsys_create_default(); 283 try.tv_sec = 20; 284 try.tv_usec = 0; 285 clnt_stat = clnt_call(clp, RPCMNT_UMOUNT, xdr_dir, 286 __UNCONST(name), xdr_void, NULL, try); 287 if (clnt_stat != RPC_SUCCESS) { 288 clnt_perror(clp, "Bad MNT RPC"); 289 return 1; 290 } 291 auth_destroy(clp->cl_auth); 292 clnt_destroy(clp); 293 } 294 #endif /* ! SMALL */ 295 return 0; 296 } 297 298 static char * 299 getmntname(const char *name, mntwhat what, char **type) 300 { 301 static struct statvfs *mntbuf; 302 static int mntsize; 303 int i; 304 305 if (mntbuf == NULL && 306 (mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) { 307 warn("getmntinfo"); 308 return (NULL); 309 } 310 for (i = mntsize - 1; i >= 0; i--) { 311 if ((what == MNTON) && !strcmp(mntbuf[i].f_mntfromname, name)) { 312 if (type) 313 *type = mntbuf[i].f_fstypename; 314 return (mntbuf[i].f_mntonname); 315 } 316 if ((what == MNTFROM) && !strcmp(mntbuf[i].f_mntonname, name)) { 317 if (type) 318 *type = mntbuf[i].f_fstypename; 319 return (mntbuf[i].f_mntfromname); 320 } 321 } 322 return (NULL); 323 } 324 325 #ifndef SMALL 326 static int 327 sacmp(const struct sockaddr *sa1, const struct sockaddr *sa2) 328 { 329 const void *p1, *p2; 330 size_t len; 331 332 if (sa1->sa_family != sa2->sa_family) 333 return 1; 334 335 switch (sa1->sa_family) { 336 case AF_INET: 337 p1 = &((const struct sockaddr_in *)sa1)->sin_addr; 338 p2 = &((const struct sockaddr_in *)sa2)->sin_addr; 339 len = 4; 340 break; 341 case AF_INET6: 342 p1 = &((const struct sockaddr_in6 *)sa1)->sin6_addr; 343 p2 = &((const struct sockaddr_in6 *)sa2)->sin6_addr; 344 len = 16; 345 if (((const struct sockaddr_in6 *)sa1)->sin6_scope_id != 346 ((const struct sockaddr_in6 *)sa2)->sin6_scope_id) 347 return 1; 348 break; 349 default: 350 return 1; 351 } 352 353 return memcmp(p1, p2, len); 354 } 355 356 static int 357 namematch(const struct addrinfo *ai) 358 { 359 struct addrinfo *aip; 360 361 if (nfshost == NULL || nfshost_ai == NULL) 362 return (1); 363 364 while (ai != NULL) { 365 aip = nfshost_ai; 366 while (aip != NULL) { 367 if (sacmp(ai->ai_addr, aip->ai_addr) == 0) 368 return 1; 369 aip = aip->ai_next; 370 } 371 ai = ai->ai_next; 372 } 373 374 return 0; 375 } 376 377 /* 378 * xdr routines for mount rpc's 379 */ 380 static int 381 xdr_dir(XDR *xdrsp, char *dirp) 382 { 383 return xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN); 384 } 385 386 static const char * 387 getmntproto(const char *name) 388 { 389 struct nfs_args nfsargs; 390 struct sockaddr_storage ss; 391 392 nfsargs.sotype = SOCK_DGRAM; 393 nfsargs.addr = (struct sockaddr *)&ss; 394 nfsargs.addrlen = sizeof(ss); 395 (void)mount("nfs", name, MNT_GETARGS, &nfsargs, sizeof(nfsargs)); 396 return nfsargs.sotype == SOCK_STREAM ? "tcp" : "udp"; 397 } 398 #endif /* !SMALL */ 399 400 static void 401 usage(void) 402 { 403 #ifdef SMALL 404 (void)fprintf(stderr, 405 "Usage: %s [-fR] special | node\n", getprogname()); 406 #else 407 (void)fprintf(stderr, 408 "Usage: %s [-fvFR] [-t fstypelist] special | node\n" 409 "\t %s -a[fvF] [-h host] [-t fstypelist]\n", getprogname(), 410 getprogname()); 411 #endif /* SMALL */ 412 exit(1); 413 } 414
Indexes created Tue Sep 30 07:10:03 GMT 2025