1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1991, 1993, 1994 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/param.h> 33 #include <sys/acl.h> 34 #include <sys/stat.h> 35 36 #include <err.h> 37 #include <errno.h> 38 #include <fcntl.h> 39 #include <fts.h> 40 #include <limits.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <sysexits.h> 44 #include <unistd.h> 45 46 #include "extern.h" 47 48 #define cp_pct(x, y) ((y == 0) ? 0 : (int)(100.0 * (x) / (y))) 49 50 /* 51 * Memory strategy threshold, in pages: if physmem is larger then this, use a 52 * large buffer. 53 */ 54 #define PHYSPAGES_THRESHOLD (32*1024) 55 56 /* Maximum buffer size in bytes - do not allow it to grow larger than this. */ 57 #define BUFSIZE_MAX (2*1024*1024) 58 59 /* 60 * Small (default) buffer size in bytes. It's inefficient for this to be 61 * smaller than MAXPHYS. 62 */ 63 #define BUFSIZE_SMALL (MAXPHYS) 64 65 /* 66 * Prompt used in -i case. 67 */ 68 #define YESNO "(y/n [n]) " 69 70 static ssize_t 71 copy_fallback(int from_fd, int to_fd) 72 { 73 static char *buf = NULL; 74 static size_t bufsize; 75 ssize_t rcount, wresid, wcount = 0; 76 char *bufp; 77 78 if (buf == NULL) { 79 if (sysconf(_SC_PHYS_PAGES) > PHYSPAGES_THRESHOLD) 80 bufsize = MIN(BUFSIZE_MAX, MAXPHYS * 8); 81 else 82 bufsize = BUFSIZE_SMALL; 83 buf = malloc(bufsize); 84 if (buf == NULL) 85 err(1, "Not enough memory"); 86 } 87 rcount = read(from_fd, buf, bufsize); 88 if (rcount <= 0) 89 return (rcount); 90 for (bufp = buf, wresid = rcount; ; bufp += wcount, wresid -= wcount) { 91 wcount = write(to_fd, bufp, wresid); 92 if (wcount <= 0) 93 break; 94 if (wcount >= wresid) 95 break; 96 } 97 return (wcount < 0 ? wcount : rcount); 98 } 99 100 int 101 copy_file(const FTSENT *entp, int dne) 102 { 103 struct stat sb, *fs; 104 ssize_t wcount; 105 off_t wtotal; 106 int ch, checkch, from_fd, rval, to_fd; 107 int use_copy_file_range = 1; 108 109 fs = entp->fts_statp; 110 from_fd = to_fd = -1; 111 if (!lflag && !sflag) { 112 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) < 0 || 113 fstat(from_fd, &sb) != 0) { 114 warn("%s", entp->fts_path); 115 return (1); 116 } 117 /* 118 * Check that the file hasn't been replaced with one of a 119 * different type. This can happen if we've been asked to 120 * copy something which is actively being modified and 121 * lost the race, or if we've been asked to copy something 122 * like /proc/X/fd/Y which stat(2) reports as S_IFREG but 123 * is actually something else once you open it. 124 */ 125 if ((sb.st_mode & S_IFMT) != (fs->st_mode & S_IFMT)) { 126 warnx("%s: File changed", entp->fts_path); 127 return (1); 128 } 129 } 130 131 /* 132 * If the file exists and we're interactive, verify with the user. 133 * If the file DNE, set the mode to be the from file, minus setuid 134 * bits, modified by the umask; arguably wrong, but it makes copying 135 * executables work right and it's been that way forever. (The 136 * other choice is 666 or'ed with the execute bits on the from file 137 * modified by the umask.) 138 */ 139 if (!dne) { 140 if (nflag) { 141 if (vflag) 142 printf("%s not overwritten\n", to.p_path); 143 rval = 1; 144 goto done; 145 } else if (iflag) { 146 (void)fprintf(stderr, "overwrite %s? %s", 147 to.p_path, YESNO); 148 checkch = ch = getchar(); 149 while (ch != '\n' && ch != EOF) 150 ch = getchar(); 151 if (checkch != 'y' && checkch != 'Y') { 152 (void)fprintf(stderr, "not overwritten\n"); 153 rval = 1; 154 goto done; 155 } 156 } 157 158 if (fflag) { 159 /* remove existing destination file */ 160 (void)unlink(to.p_path); 161 dne = 1; 162 } 163 } 164 165 rval = 0; 166 167 if (lflag) { 168 if (link(entp->fts_path, to.p_path) != 0) { 169 warn("%s", to.p_path); 170 rval = 1; 171 } 172 goto done; 173 } 174 175 if (sflag) { 176 if (symlink(entp->fts_path, to.p_path) != 0) { 177 warn("%s", to.p_path); 178 rval = 1; 179 } 180 goto done; 181 } 182 183 if (!dne) { 184 /* overwrite existing destination file */ 185 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 186 } else { 187 /* create new destination file */ 188 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 189 fs->st_mode & ~(S_ISUID | S_ISGID)); 190 } 191 if (to_fd == -1) { 192 warn("%s", to.p_path); 193 rval = 1; 194 goto done; 195 } 196 197 wtotal = 0; 198 do { 199 if (use_copy_file_range) { 200 wcount = copy_file_range(from_fd, NULL, 201 to_fd, NULL, SSIZE_MAX, 0); 202 if (wcount < 0 && errno == EINVAL) { 203 /* probably a non-seekable descriptor */ 204 use_copy_file_range = 0; 205 } 206 } 207 if (!use_copy_file_range) { 208 wcount = copy_fallback(from_fd, to_fd); 209 } 210 wtotal += wcount; 211 if (info) { 212 info = 0; 213 (void)fprintf(stderr, 214 "%s -> %s %3d%%\n", 215 entp->fts_path, to.p_path, 216 cp_pct(wtotal, fs->st_size)); 217 } 218 } while (wcount > 0); 219 if (wcount < 0) { 220 warn("%s", entp->fts_path); 221 rval = 1; 222 } 223 224 /* 225 * Don't remove the target even after an error. The target might 226 * not be a regular file, or its attributes might be important, 227 * or its contents might be irreplaceable. It would only be safe 228 * to remove it if we created it and its length is 0. 229 */ 230 if (pflag && setfile(fs, to_fd)) 231 rval = 1; 232 if (pflag && preserve_fd_acls(from_fd, to_fd) != 0) 233 rval = 1; 234 if (close(to_fd)) { 235 warn("%s", to.p_path); 236 rval = 1; 237 } 238 239 done: 240 if (from_fd != -1) 241 (void)close(from_fd); 242 return (rval); 243 } 244 245 int 246 copy_link(const FTSENT *p, int exists) 247 { 248 ssize_t len; 249 char llink[PATH_MAX]; 250 251 if (exists && nflag) { 252 if (vflag) 253 printf("%s not overwritten\n", to.p_path); 254 return (1); 255 } 256 if ((len = readlink(p->fts_path, llink, sizeof(llink) - 1)) == -1) { 257 warn("readlink: %s", p->fts_path); 258 return (1); 259 } 260 llink[len] = '\0'; 261 if (exists && unlink(to.p_path)) { 262 warn("unlink: %s", to.p_path); 263 return (1); 264 } 265 if (symlink(llink, to.p_path)) { 266 warn("symlink: %s", llink); 267 return (1); 268 } 269 return (pflag ? setfile(p->fts_statp, -1) : 0); 270 } 271 272 int 273 copy_fifo(struct stat *from_stat, int exists) 274 { 275 276 if (exists && nflag) { 277 if (vflag) 278 printf("%s not overwritten\n", to.p_path); 279 return (1); 280 } 281 if (exists && unlink(to.p_path)) { 282 warn("unlink: %s", to.p_path); 283 return (1); 284 } 285 if (mkfifo(to.p_path, from_stat->st_mode)) { 286 warn("mkfifo: %s", to.p_path); 287 return (1); 288 } 289 return (pflag ? setfile(from_stat, -1) : 0); 290 } 291 292 int 293 copy_special(struct stat *from_stat, int exists) 294 { 295 296 if (exists && nflag) { 297 if (vflag) 298 printf("%s not overwritten\n", to.p_path); 299 return (1); 300 } 301 if (exists && unlink(to.p_path)) { 302 warn("unlink: %s", to.p_path); 303 return (1); 304 } 305 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 306 warn("mknod: %s", to.p_path); 307 return (1); 308 } 309 return (pflag ? setfile(from_stat, -1) : 0); 310 } 311 312 int 313 setfile(struct stat *fs, int fd) 314 { 315 static struct timespec tspec[2]; 316 struct stat ts; 317 int rval, gotstat, islink, fdval; 318 319 rval = 0; 320 fdval = fd != -1; 321 islink = !fdval && S_ISLNK(fs->st_mode); 322 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | 323 S_IRWXU | S_IRWXG | S_IRWXO; 324 325 tspec[0] = fs->st_atim; 326 tspec[1] = fs->st_mtim; 327 if (fdval ? futimens(fd, tspec) : utimensat(AT_FDCWD, to.p_path, tspec, 328 islink ? AT_SYMLINK_NOFOLLOW : 0)) { 329 warn("utimensat: %s", to.p_path); 330 rval = 1; 331 } 332 if (fdval ? fstat(fd, &ts) : 333 (islink ? lstat(to.p_path, &ts) : stat(to.p_path, &ts))) 334 gotstat = 0; 335 else { 336 gotstat = 1; 337 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX | 338 S_IRWXU | S_IRWXG | S_IRWXO; 339 } 340 /* 341 * Changing the ownership probably won't succeed, unless we're root 342 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 343 * the mode; current BSD behavior is to remove all setuid bits on 344 * chown. If chown fails, lose setuid/setgid bits. 345 */ 346 if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid) 347 if (fdval ? fchown(fd, fs->st_uid, fs->st_gid) : 348 (islink ? lchown(to.p_path, fs->st_uid, fs->st_gid) : 349 chown(to.p_path, fs->st_uid, fs->st_gid))) { 350 if (errno != EPERM) { 351 warn("chown: %s", to.p_path); 352 rval = 1; 353 } 354 fs->st_mode &= ~(S_ISUID | S_ISGID); 355 } 356 357 if (!gotstat || fs->st_mode != ts.st_mode) 358 if (fdval ? fchmod(fd, fs->st_mode) : 359 (islink ? lchmod(to.p_path, fs->st_mode) : 360 chmod(to.p_path, fs->st_mode))) { 361 warn("chmod: %s", to.p_path); 362 rval = 1; 363 } 364 365 if (!Nflag && (!gotstat || fs->st_flags != ts.st_flags)) 366 if (fdval ? 367 fchflags(fd, fs->st_flags) : 368 (islink ? lchflags(to.p_path, fs->st_flags) : 369 chflags(to.p_path, fs->st_flags))) { 370 /* 371 * NFS doesn't support chflags; ignore errors unless 372 * there's reason to believe we're losing bits. (Note, 373 * this still won't be right if the server supports 374 * flags and we were trying to *remove* flags on a file 375 * that we copied, i.e., that we didn't create.) 376 */ 377 if (errno != EOPNOTSUPP || fs->st_flags != 0) { 378 warn("chflags: %s", to.p_path); 379 rval = 1; 380 } 381 } 382 383 return (rval); 384 } 385 386 int 387 preserve_fd_acls(int source_fd, int dest_fd) 388 { 389 acl_t acl; 390 acl_type_t acl_type; 391 int acl_supported = 0, ret, trivial; 392 393 ret = fpathconf(source_fd, _PC_ACL_NFS4); 394 if (ret > 0 ) { 395 acl_supported = 1; 396 acl_type = ACL_TYPE_NFS4; 397 } else if (ret < 0 && errno != EINVAL) { 398 warn("fpathconf(..., _PC_ACL_NFS4) failed for %s", to.p_path); 399 return (1); 400 } 401 if (acl_supported == 0) { 402 ret = fpathconf(source_fd, _PC_ACL_EXTENDED); 403 if (ret > 0 ) { 404 acl_supported = 1; 405 acl_type = ACL_TYPE_ACCESS; 406 } else if (ret < 0 && errno != EINVAL) { 407 warn("fpathconf(..., _PC_ACL_EXTENDED) failed for %s", 408 to.p_path); 409 return (1); 410 } 411 } 412 if (acl_supported == 0) 413 return (0); 414 415 acl = acl_get_fd_np(source_fd, acl_type); 416 if (acl == NULL) { 417 warn("failed to get acl entries while setting %s", to.p_path); 418 return (1); 419 } 420 if (acl_is_trivial_np(acl, &trivial)) { 421 warn("acl_is_trivial() failed for %s", to.p_path); 422 acl_free(acl); 423 return (1); 424 } 425 if (trivial) { 426 acl_free(acl); 427 return (0); 428 } 429 if (acl_set_fd_np(dest_fd, acl, acl_type) < 0) { 430 warn("failed to set acl entries for %s", to.p_path); 431 acl_free(acl); 432 return (1); 433 } 434 acl_free(acl); 435 return (0); 436 } 437 438 int 439 preserve_dir_acls(struct stat *fs, char *source_dir, char *dest_dir) 440 { 441 acl_t (*aclgetf)(const char *, acl_type_t); 442 int (*aclsetf)(const char *, acl_type_t, acl_t); 443 struct acl *aclp; 444 acl_t acl; 445 acl_type_t acl_type; 446 int acl_supported = 0, ret, trivial; 447 448 ret = pathconf(source_dir, _PC_ACL_NFS4); 449 if (ret > 0) { 450 acl_supported = 1; 451 acl_type = ACL_TYPE_NFS4; 452 } else if (ret < 0 && errno != EINVAL) { 453 warn("fpathconf(..., _PC_ACL_NFS4) failed for %s", source_dir); 454 return (1); 455 } 456 if (acl_supported == 0) { 457 ret = pathconf(source_dir, _PC_ACL_EXTENDED); 458 if (ret > 0) { 459 acl_supported = 1; 460 acl_type = ACL_TYPE_ACCESS; 461 } else if (ret < 0 && errno != EINVAL) { 462 warn("fpathconf(..., _PC_ACL_EXTENDED) failed for %s", 463 source_dir); 464 return (1); 465 } 466 } 467 if (acl_supported == 0) 468 return (0); 469 470 /* 471 * If the file is a link we will not follow it. 472 */ 473 if (S_ISLNK(fs->st_mode)) { 474 aclgetf = acl_get_link_np; 475 aclsetf = acl_set_link_np; 476 } else { 477 aclgetf = acl_get_file; 478 aclsetf = acl_set_file; 479 } 480 if (acl_type == ACL_TYPE_ACCESS) { 481 /* 482 * Even if there is no ACL_TYPE_DEFAULT entry here, a zero 483 * size ACL will be returned. So it is not safe to simply 484 * check the pointer to see if the default ACL is present. 485 */ 486 acl = aclgetf(source_dir, ACL_TYPE_DEFAULT); 487 if (acl == NULL) { 488 warn("failed to get default acl entries on %s", 489 source_dir); 490 return (1); 491 } 492 aclp = &acl->ats_acl; 493 if (aclp->acl_cnt != 0 && aclsetf(dest_dir, 494 ACL_TYPE_DEFAULT, acl) < 0) { 495 warn("failed to set default acl entries on %s", 496 dest_dir); 497 acl_free(acl); 498 return (1); 499 } 500 acl_free(acl); 501 } 502 acl = aclgetf(source_dir, acl_type); 503 if (acl == NULL) { 504 warn("failed to get acl entries on %s", source_dir); 505 return (1); 506 } 507 if (acl_is_trivial_np(acl, &trivial)) { 508 warn("acl_is_trivial() failed on %s", source_dir); 509 acl_free(acl); 510 return (1); 511 } 512 if (trivial) { 513 acl_free(acl); 514 return (0); 515 } 516 if (aclsetf(dest_dir, acl_type, acl) < 0) { 517 warn("failed to set acl entries on %s", dest_dir); 518 acl_free(acl); 519 return (1); 520 } 521 acl_free(acl); 522 return (0); 523 } 524 525 void 526 usage(void) 527 { 528 529 (void)fprintf(stderr, "%s\n%s\n", 530 "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-alpsvx] " 531 "source_file target_file", 532 " cp [-R [-H | -L | -P]] [-f | -i | -n] [-alpsvx] " 533 "source_file ... " 534 "target_directory"); 535 exit(EX_USAGE); 536 } 537