1 /*- 2 * Copyright (c) 1989, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Ken Smith of The State University of New York at Buffalo. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/param.h> 34 #include <sys/time.h> 35 #include <sys/wait.h> 36 #include <sys/stat.h> 37 #include <sys/mount.h> 38 39 #include <err.h> 40 #include <errno.h> 41 #include <fcntl.h> 42 #include <grp.h> 43 #include <limits.h> 44 #include <paths.h> 45 #include <pwd.h> 46 #include <signal.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <sysexits.h> 51 #include <unistd.h> 52 53 /* Exit code for a failed exec. */ 54 #define EXEC_FAILED 127 55 56 #ifndef _PATH_RM 57 #define _PATH_RM "/bin/rm" 58 #endif 59 60 static int fflg, hflg, iflg, nflg, vflg; 61 static volatile sig_atomic_t info; 62 63 static int copy(const char *, const char *); 64 static int do_move(const char *, const char *); 65 static int fastcopy(const char *, const char *, struct stat *); 66 static void usage(void); 67 #ifdef SIGINFO 68 static void siginfo(int); 69 #endif 70 71 int 72 main(int argc, char *argv[]) 73 { 74 size_t baselen, len; 75 int rval; 76 char *p, *endp; 77 struct stat sb; 78 int ch; 79 char path[PATH_MAX]; 80 81 while ((ch = getopt(argc, argv, "fhinv")) != -1) 82 switch (ch) { 83 case 'h': 84 hflg = 1; 85 break; 86 case 'i': 87 iflg = 1; 88 fflg = nflg = 0; 89 break; 90 case 'f': 91 fflg = 1; 92 iflg = nflg = 0; 93 break; 94 case 'n': 95 nflg = 1; 96 fflg = iflg = 0; 97 break; 98 case 'v': 99 vflg = 1; 100 break; 101 default: 102 usage(); 103 } 104 argc -= optind; 105 argv += optind; 106 107 #ifdef SIGINFO 108 signal(SIGINFO, siginfo); 109 #endif 110 111 if (argc < 2) 112 usage(); 113 114 /* 115 * If the stat on the target fails or the target isn't a directory, 116 * try the move. More than 2 arguments is an error in this case. 117 */ 118 if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) { 119 if (argc > 2) 120 usage(); 121 exit(do_move(argv[0], argv[1])); 122 } 123 124 /* 125 * If -h was specified, treat the target as a symlink instead of 126 * directory. 127 */ 128 if (hflg) { 129 if (argc > 2) 130 usage(); 131 if (lstat(argv[1], &sb) == 0 && S_ISLNK(sb.st_mode)) 132 exit(do_move(argv[0], argv[1])); 133 } 134 135 /* It's a directory, move each file into it. */ 136 if (strlen(argv[argc - 1]) > sizeof(path) - 1) 137 errx(1, "%s: destination pathname too long", *argv); 138 strcpy(path, argv[argc - 1]); 139 baselen = strlen(path); 140 endp = &path[baselen]; 141 if (!baselen || *(endp - 1) != '/') { 142 *endp++ = '/'; 143 ++baselen; 144 } 145 for (rval = 0; --argc; ++argv) { 146 /* 147 * Find the last component of the source pathname. It 148 * may have trailing slashes. 149 */ 150 p = *argv + strlen(*argv); 151 while (p != *argv && p[-1] == '/') 152 --p; 153 while (p != *argv && p[-1] != '/') 154 --p; 155 156 if ((baselen + (len = strlen(p))) >= PATH_MAX) { 157 warnx("%s: destination pathname too long", *argv); 158 rval = 1; 159 } else { 160 memmove(endp, p, (size_t)len + 1); 161 if (do_move(*argv, path)) 162 rval = 1; 163 } 164 } 165 exit(rval); 166 } 167 168 static int 169 do_move(const char *from, const char *to) 170 { 171 struct stat sb; 172 int ask, ch, first; 173 char modep[15]; 174 175 /* 176 * Check access. If interactive and file exists, ask user if it 177 * should be replaced. Otherwise if file exists but isn't writable 178 * make sure the user wants to clobber it. 179 */ 180 if (!fflg && !access(to, F_OK)) { 181 182 /* prompt only if source exist */ 183 if (lstat(from, &sb) == -1) { 184 warn("%s", from); 185 return (1); 186 } 187 188 #define YESNO "(y/n [n]) " 189 ask = 0; 190 if (nflg) { 191 if (vflg) 192 printf("%s not overwritten\n", to); 193 return (0); 194 } else if (iflg) { 195 fprintf(stderr, "overwrite %s? %s", to, YESNO); 196 ask = 1; 197 } else if (access(to, W_OK) && !stat(to, &sb) && isatty(STDIN_FILENO)) { 198 strmode(sb.st_mode, modep); 199 fprintf(stderr, "override %s%s%s/%s for %s? %s", 200 modep + 1, modep[9] == ' ' ? "" : " ", 201 user_from_uid((unsigned long)sb.st_uid, 0), 202 group_from_gid((unsigned long)sb.st_gid, 0), to, YESNO); 203 ask = 1; 204 } 205 if (ask) { 206 first = ch = getchar(); 207 while (ch != '\n' && ch != EOF) 208 ch = getchar(); 209 if (first != 'y' && first != 'Y') { 210 fprintf(stderr, "not overwritten\n"); 211 return (0); 212 } 213 } 214 } 215 /* 216 * Rename on FreeBSD will fail with EISDIR and ENOTDIR, before failing 217 * with EXDEV. Therefore, copy() doesn't have to perform the checks 218 * specified in the Step 3 of the POSIX mv specification. 219 */ 220 if (!rename(from, to)) { 221 if (vflg) 222 printf("%s -> %s\n", from, to); 223 return (0); 224 } 225 226 if (errno == EXDEV) { 227 char path[PATH_MAX]; 228 int target_is_file = 0; 229 230 if (!lstat(to, &sb) && S_ISREG(sb.st_mode)) 231 target_is_file = 1; 232 /* 233 * If the source is a symbolic link and is on another 234 * filesystem, it can be recreated at the destination. 235 */ 236 if (lstat(from, &sb) == -1) { 237 warn("%s", from); 238 return (1); 239 } 240 /* Can't mv(1) directory into a file ever. */ 241 if (target_is_file && S_ISDIR(sb.st_mode)) { 242 warn("cannot overwrite %s with directory", to); 243 return (1); 244 } 245 if (!S_ISLNK(sb.st_mode)) { 246 /* Can't mv(1) a mount point. */ 247 if (realpath(from, path) == NULL) { 248 warn("cannot resolve %s: %s", from, path); 249 return (1); 250 } 251 #ifdef MNAMELEN 252 struct statfs sfs; 253 if (!statfs(path, &sfs) && 254 !strcmp(path, sfs.f_mntonname)) { 255 warnx("cannot rename a mount point"); 256 return (1); 257 } 258 #endif 259 } 260 } else { 261 warn("rename %s to %s", from, to); 262 return (1); 263 } 264 265 /* 266 * If rename fails because we're trying to cross devices, and 267 * it's a regular file, do the copy internally; otherwise, use 268 * cp and rm. 269 */ 270 if (lstat(from, &sb)) { 271 warn("%s", from); 272 return (1); 273 } 274 return (S_ISREG(sb.st_mode) ? 275 fastcopy(from, to, &sb) : copy(from, to)); 276 } 277 278 static int 279 fastcopy(const char *from, const char *to, struct stat *sbp) 280 { 281 struct timeval tval[2]; 282 static u_int blen = MAXPHYS; 283 static char *bp = NULL; 284 mode_t oldmode; 285 int from_fd, to_fd; 286 ssize_t nread; 287 288 if ((from_fd = open(from, O_RDONLY, 0)) < 0) { 289 warn("fastcopy: open() failed (from): %s", from); 290 return (1); 291 } 292 if (bp == NULL && (bp = malloc((size_t)blen)) == NULL) { 293 warnx("malloc(%u) failed", blen); 294 return (1); 295 } 296 while ((to_fd = 297 open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) { 298 if (errno == EEXIST && unlink(to) == 0) 299 continue; 300 warn("fastcopy: open() failed (to): %s", to); 301 close(from_fd); 302 return (1); 303 } 304 while ((nread = read(from_fd, bp, (size_t)blen)) > 0) 305 if (write(to_fd, bp, (size_t)nread) != nread) { 306 warn("fastcopy: write() failed: %s", to); 307 goto err; 308 } 309 if (nread < 0) { 310 warn("fastcopy: read() failed: %s", from); 311 err: if (unlink(to)) 312 warn("%s: remove", to); 313 close(from_fd); 314 close(to_fd); 315 return (1); 316 } 317 318 oldmode = sbp->st_mode & ALLPERMS; 319 if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) { 320 warn("%s: set owner/group (was: %lu/%lu)", to, 321 (u_long)sbp->st_uid, (u_long)sbp->st_gid); 322 if (oldmode & (S_ISUID | S_ISGID)) { 323 warnx( 324 "%s: owner/group changed; clearing suid/sgid (mode was 0%03o)", 325 to, oldmode); 326 sbp->st_mode &= ~(S_ISUID | S_ISGID); 327 } 328 } 329 if (fchmod(to_fd, sbp->st_mode)) 330 warn("%s: set mode (was: 0%03o)", to, oldmode); 331 332 close(from_fd); 333 /* 334 * XXX 335 * NFS doesn't support chflags; ignore errors unless there's reason 336 * to believe we're losing bits. (Note, this still won't be right 337 * if the server supports flags and we were trying to *remove* flags 338 * on a file that we copied, i.e., that we didn't create.) 339 */ 340 errno = 0; 341 #ifdef _ST_FLAGS_PRESENT_ 342 if (fchflags(to_fd, sbp->st_flags)) 343 if (errno != EOPNOTSUPP || sbp->st_flags != 0) 344 warn("%s: set flags (was: 0%07o)", to, sbp->st_flags); 345 #endif 346 347 tval[0].tv_sec = sbp->st_atime; 348 tval[1].tv_sec = sbp->st_mtime; 349 tval[0].tv_usec = tval[1].tv_usec = 0; 350 if (utimes(to, tval)) 351 warn("%s: set times", to); 352 353 if (close(to_fd)) { 354 warn("%s", to); 355 return (1); 356 } 357 358 if (unlink(from)) { 359 warn("%s: remove", from); 360 return (1); 361 } 362 if (vflg) 363 printf("%s -> %s\n", from, to); 364 return (0); 365 } 366 367 static int 368 copy(const char *from, const char *to) 369 { 370 struct stat sb; 371 int status; 372 pid_t pid; 373 374 if (lstat(to, &sb) == 0) { 375 /* Destination path exists. */ 376 if (S_ISDIR(sb.st_mode)) { 377 if (rmdir(to) != 0) { 378 warn("rmdir %s", to); 379 return (1); 380 } 381 } else { 382 if (unlink(to) != 0) { 383 warn("unlink %s", to); 384 return (1); 385 } 386 } 387 } else if (errno != ENOENT) { 388 warn("%s", to); 389 return (1); 390 } 391 392 /* Copy source to destination. */ 393 if (!(pid = vfork())) { 394 execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", "--", from, to, 395 NULL); 396 _exit(EXEC_FAILED); 397 } 398 if (waitpid(pid, &status, 0) == -1) { 399 warn("%s %s %s: waitpid", _PATH_CP, from, to); 400 return (1); 401 } 402 if (!WIFEXITED(status)) { 403 warnx("%s %s %s: did not terminate normally", 404 _PATH_CP, from, to); 405 return (1); 406 } 407 switch (WEXITSTATUS(status)) { 408 case 0: 409 break; 410 case EXEC_FAILED: 411 warnx("%s %s %s: exec failed", _PATH_CP, from, to); 412 return (1); 413 default: 414 warnx("%s %s %s: terminated with %d (non-zero) status", 415 _PATH_CP, from, to, WEXITSTATUS(status)); 416 return (1); 417 } 418 419 /* Delete the source. */ 420 if (!(pid = vfork())) { 421 execl(_PATH_RM, "mv", "-rf", "--", from, NULL); 422 _exit(EXEC_FAILED); 423 } 424 if (waitpid(pid, &status, 0) == -1) { 425 warn("%s %s: waitpid", _PATH_RM, from); 426 return (1); 427 } 428 if (!WIFEXITED(status)) { 429 warnx("%s %s: did not terminate normally", _PATH_RM, from); 430 return (1); 431 } 432 switch (WEXITSTATUS(status)) { 433 case 0: 434 break; 435 case EXEC_FAILED: 436 warnx("%s %s: exec failed", _PATH_RM, from); 437 return (1); 438 default: 439 warnx("%s %s: terminated with %d (non-zero) status", 440 _PATH_RM, from, WEXITSTATUS(status)); 441 return (1); 442 } 443 return (0); 444 } 445 446 static void 447 usage(void) 448 { 449 450 fprintf(stderr, "%s\n%s\n", 451 "usage: mv [-f | -i | -n] [-hv] source target", 452 " mv [-f | -i | -n] [-v] source ... directory"); 453 exit(EX_USAGE); 454 } 455 456 #ifdef SIGINFO 457 static void 458 siginfo(int notused __unused) 459 { 460 info = 1; 461 } 462 #endif 463