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 #ifndef lint 33 #if 0 34 static char sccsid[] = "@(#)utils.c 8.3 (Berkeley) 4/1/94"; 35 #endif 36 #endif /* not lint */ 37 #include <sys/cdefs.h> 38 #include <sys/param.h> 39 #include <sys/acl.h> 40 #include <sys/stat.h> 41 42 #include <err.h> 43 #include <errno.h> 44 #include <fcntl.h> 45 #include <fts.h> 46 #include <limits.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <sysexits.h> 50 #include <unistd.h> 51 52 #include "extern.h" 53 54 #define cp_pct(x, y) ((y == 0) ? 0 : (int)(100.0 * (x) / (y))) 55 56 /* 57 * Memory strategy threshold, in pages: if physmem is larger then this, use a 58 * large buffer. 59 */ 60 #define PHYSPAGES_THRESHOLD (32*1024) 61 62 /* Maximum buffer size in bytes - do not allow it to grow larger than this. */ 63 #define BUFSIZE_MAX (2*1024*1024) 64 65 /* 66 * Small (default) buffer size in bytes. It's inefficient for this to be 67 * smaller than MAXPHYS. 68 */ 69 #define BUFSIZE_SMALL (MAXPHYS) 70 71 /* 72 * Prompt used in -i case. 73 */ 74 #define YESNO "(y/n [n]) " 75 76 static ssize_t 77 copy_fallback(int from_fd, int to_fd) 78 { 79 static char *buf = NULL; 80 static size_t bufsize; 81 ssize_t rcount, wresid, wcount = 0; 82 char *bufp; 83 84 if (buf == NULL) { 85 if (sysconf(_SC_PHYS_PAGES) > PHYSPAGES_THRESHOLD) 86 bufsize = MIN(BUFSIZE_MAX, MAXPHYS * 8); 87 else 88 bufsize = BUFSIZE_SMALL; 89 buf = malloc(bufsize); 90 if (buf == NULL) 91 err(1, "Not enough memory"); 92 } 93 rcount = read(from_fd, buf, bufsize); 94 if (rcount <= 0) 95 return (rcount); 96 for (bufp = buf, wresid = rcount; ; bufp += wcount, wresid -= wcount) { 97 wcount = write(to_fd, bufp, wresid); 98 if (wcount <= 0) 99 break; 100 if (wcount >= wresid) 101 break; 102 } 103 return (wcount < 0 ? wcount : rcount); 104 } 105 106 int 107 copy_file(const FTSENT *entp, int dne) 108 { 109 struct stat sb, *fs; 110 ssize_t wcount; 111 off_t wtotal; 112 int ch, checkch, from_fd, rval, to_fd; 113 int use_copy_file_range = 1; 114 115 fs = entp->fts_statp; 116 from_fd = to_fd = -1; 117 if (!lflag && !sflag) { 118 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) < 0 || 119 fstat(from_fd, &sb) != 0) { 120 warn("%s", entp->fts_path); 121 return (1); 122 } 123 /* 124 * Check that the file hasn't been replaced with one of a 125 * different type. This can happen if we've been asked to 126 * copy something which is actively being modified and 127 * lost the race, or if we've been asked to copy something 128 * like /proc/X/fd/Y which stat(2) reports as S_IFREG but 129 * is actually something else once you open it. 130 */ 131 if ((sb.st_mode & S_IFMT) != (fs->st_mode & S_IFMT)) { 132 warnx("%s: File changed", entp->fts_path); 133 return (1); 134 } 135 } 136 137 /* 138 * If the file exists and we're interactive, verify with the user. 139 * If the file DNE, set the mode to be the from file, minus setuid 140 * bits, modified by the umask; arguably wrong, but it makes copying 141 * executables work right and it's been that way forever. (The 142 * other choice is 666 or'ed with the execute bits on the from file 143 * modified by the umask.) 144 */ 145 if (!dne) { 146 if (nflag) { 147 if (vflag) 148 printf("%s not overwritten\n", to.p_path); 149 rval = 1; 150 goto done; 151 } else if (iflag) { 152 (void)fprintf(stderr, "overwrite %s? %s", 153 to.p_path, YESNO); 154 checkch = ch = getchar(); 155 while (ch != '\n' && ch != EOF) 156 ch = getchar(); 157 if (checkch != 'y' && checkch != 'Y') { 158 (void)fprintf(stderr, "not overwritten\n"); 159 rval = 1; 160 goto done; 161 } 162 } 163 164 if (fflag) { 165 /* remove existing destination file */ 166 (void)unlink(to.p_path); 167 dne = 1; 168 } 169 } 170 171 rval = 0; 172 173 if (lflag) { 174 if (link(entp->fts_path, to.p_path) != 0) { 175 warn("%s", to.p_path); 176 rval = 1; 177 } 178 goto done; 179 } 180 181 if (sflag) { 182 if (symlink(entp->fts_path, to.p_path) != 0) { 183 warn("%s", to.p_path); 184 rval = 1; 185 } 186 goto done; 187 } 188 189 if (!dne) { 190 /* overwrite existing destination file */ 191 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 192 } else { 193 /* create new destination file */ 194 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 195 fs->st_mode & ~(S_ISUID | S_ISGID)); 196 } 197 if (to_fd == -1) { 198 warn("%s", to.p_path); 199 rval = 1; 200 goto done; 201 } 202 203 wtotal = 0; 204 do { 205 if (use_copy_file_range) { 206 wcount = copy_file_range(from_fd, NULL, 207 to_fd, NULL, SSIZE_MAX, 0); 208 if (wcount < 0 && errno == EINVAL) { 209 /* probably a non-seekable descriptor */ 210 use_copy_file_range = 0; 211 } 212 } 213 if (!use_copy_file_range) { 214 wcount = copy_fallback(from_fd, to_fd); 215 } 216 wtotal += wcount; 217 if (info) { 218 info = 0; 219 (void)fprintf(stderr, 220 "%s -> %s %3d%%\n", 221 entp->fts_path, to.p_path, 222 cp_pct(wtotal, fs->st_size)); 223 } 224 } while (wcount > 0); 225 if (wcount < 0) { 226 warn("%s", entp->fts_path); 227 rval = 1; 228 } 229 230 /* 231 * Don't remove the target even after an error. The target might 232 * not be a regular file, or its attributes might be important, 233 * or its contents might be irreplaceable. It would only be safe 234 * to remove it if we created it and its length is 0. 235 */ 236 if (pflag && setfile(fs, to_fd)) 237 rval = 1; 238 if (pflag && preserve_fd_acls(from_fd, to_fd) != 0) 239 rval = 1; 240 if (close(to_fd)) { 241 warn("%s", to.p_path); 242 rval = 1; 243 } 244 245 done: 246 if (from_fd != -1) 247 (void)close(from_fd); 248 return (rval); 249 } 250 251 int 252 copy_link(const FTSENT *p, int exists) 253 { 254 ssize_t len; 255 char llink[PATH_MAX]; 256 257 if (exists && nflag) { 258 if (vflag) 259 printf("%s not overwritten\n", to.p_path); 260 return (1); 261 } 262 if ((len = readlink(p->fts_path, llink, sizeof(llink) - 1)) == -1) { 263 warn("readlink: %s", p->fts_path); 264 return (1); 265 } 266 llink[len] = '\0'; 267 if (exists && unlink(to.p_path)) { 268 warn("unlink: %s", to.p_path); 269 return (1); 270 } 271 if (symlink(llink, to.p_path)) { 272 warn("symlink: %s", llink); 273 return (1); 274 } 275 return (pflag ? setfile(p->fts_statp, -1) : 0); 276 } 277 278 int 279 copy_fifo(struct stat *from_stat, int exists) 280 { 281 282 if (exists && nflag) { 283 if (vflag) 284 printf("%s not overwritten\n", to.p_path); 285 return (1); 286 } 287 if (exists && unlink(to.p_path)) { 288 warn("unlink: %s", to.p_path); 289 return (1); 290 } 291 if (mkfifo(to.p_path, from_stat->st_mode)) { 292 warn("mkfifo: %s", to.p_path); 293 return (1); 294 } 295 return (pflag ? setfile(from_stat, -1) : 0); 296 } 297 298 int 299 copy_special(struct stat *from_stat, int exists) 300 { 301 302 if (exists && nflag) { 303 if (vflag) 304 printf("%s not overwritten\n", to.p_path); 305 return (1); 306 } 307 if (exists && unlink(to.p_path)) { 308 warn("unlink: %s", to.p_path); 309 return (1); 310 } 311 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 312 warn("mknod: %s", to.p_path); 313 return (1); 314 } 315 return (pflag ? setfile(from_stat, -1) : 0); 316 } 317 318 int 319 setfile(struct stat *fs, int fd) 320 { 321 static struct timespec tspec[2]; 322 struct stat ts; 323 int rval, gotstat, islink, fdval; 324 325 rval = 0; 326 fdval = fd != -1; 327 islink = !fdval && S_ISLNK(fs->st_mode); 328 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | 329 S_IRWXU | S_IRWXG | S_IRWXO; 330 331 tspec[0] = fs->st_atim; 332 tspec[1] = fs->st_mtim; 333 if (fdval ? futimens(fd, tspec) : utimensat(AT_FDCWD, to.p_path, tspec, 334 islink ? AT_SYMLINK_NOFOLLOW : 0)) { 335 warn("utimensat: %s", to.p_path); 336 rval = 1; 337 } 338 if (fdval ? fstat(fd, &ts) : 339 (islink ? lstat(to.p_path, &ts) : stat(to.p_path, &ts))) 340 gotstat = 0; 341 else { 342 gotstat = 1; 343 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX | 344 S_IRWXU | S_IRWXG | S_IRWXO; 345 } 346 /* 347 * Changing the ownership probably won't succeed, unless we're root 348 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 349 * the mode; current BSD behavior is to remove all setuid bits on 350 * chown. If chown fails, lose setuid/setgid bits. 351 */ 352 if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid) 353 if (fdval ? fchown(fd, fs->st_uid, fs->st_gid) : 354 (islink ? lchown(to.p_path, fs->st_uid, fs->st_gid) : 355 chown(to.p_path, fs->st_uid, fs->st_gid))) { 356 if (errno != EPERM) { 357 warn("chown: %s", to.p_path); 358 rval = 1; 359 } 360 fs->st_mode &= ~(S_ISUID | S_ISGID); 361 } 362 363 if (!gotstat || fs->st_mode != ts.st_mode) 364 if (fdval ? fchmod(fd, fs->st_mode) : 365 (islink ? lchmod(to.p_path, fs->st_mode) : 366 chmod(to.p_path, fs->st_mode))) { 367 warn("chmod: %s", to.p_path); 368 rval = 1; 369 } 370 371 if (!Nflag && (!gotstat || fs->st_flags != ts.st_flags)) 372 if (fdval ? 373 fchflags(fd, fs->st_flags) : 374 (islink ? lchflags(to.p_path, fs->st_flags) : 375 chflags(to.p_path, fs->st_flags))) { 376 /* 377 * NFS doesn't support chflags; ignore errors unless 378 * there's reason to believe we're losing bits. (Note, 379 * this still won't be right if the server supports 380 * flags and we were trying to *remove* flags on a file 381 * that we copied, i.e., that we didn't create.) 382 */ 383 if (errno != EOPNOTSUPP || fs->st_flags != 0) { 384 warn("chflags: %s", to.p_path); 385 rval = 1; 386 } 387 } 388 389 return (rval); 390 } 391 392 int 393 preserve_fd_acls(int source_fd, int dest_fd) 394 { 395 acl_t acl; 396 acl_type_t acl_type; 397 int acl_supported = 0, ret, trivial; 398 399 ret = fpathconf(source_fd, _PC_ACL_NFS4); 400 if (ret > 0 ) { 401 acl_supported = 1; 402 acl_type = ACL_TYPE_NFS4; 403 } else if (ret < 0 && errno != EINVAL) { 404 warn("fpathconf(..., _PC_ACL_NFS4) failed for %s", to.p_path); 405 return (1); 406 } 407 if (acl_supported == 0) { 408 ret = fpathconf(source_fd, _PC_ACL_EXTENDED); 409 if (ret > 0 ) { 410 acl_supported = 1; 411 acl_type = ACL_TYPE_ACCESS; 412 } else if (ret < 0 && errno != EINVAL) { 413 warn("fpathconf(..., _PC_ACL_EXTENDED) failed for %s", 414 to.p_path); 415 return (1); 416 } 417 } 418 if (acl_supported == 0) 419 return (0); 420 421 acl = acl_get_fd_np(source_fd, acl_type); 422 if (acl == NULL) { 423 warn("failed to get acl entries while setting %s", to.p_path); 424 return (1); 425 } 426 if (acl_is_trivial_np(acl, &trivial)) { 427 warn("acl_is_trivial() failed for %s", to.p_path); 428 acl_free(acl); 429 return (1); 430 } 431 if (trivial) { 432 acl_free(acl); 433 return (0); 434 } 435 if (acl_set_fd_np(dest_fd, acl, acl_type) < 0) { 436 warn("failed to set acl entries for %s", to.p_path); 437 acl_free(acl); 438 return (1); 439 } 440 acl_free(acl); 441 return (0); 442 } 443 444 int 445 preserve_dir_acls(struct stat *fs, char *source_dir, char *dest_dir) 446 { 447 acl_t (*aclgetf)(const char *, acl_type_t); 448 int (*aclsetf)(const char *, acl_type_t, acl_t); 449 struct acl *aclp; 450 acl_t acl; 451 acl_type_t acl_type; 452 int acl_supported = 0, ret, trivial; 453 454 ret = pathconf(source_dir, _PC_ACL_NFS4); 455 if (ret > 0) { 456 acl_supported = 1; 457 acl_type = ACL_TYPE_NFS4; 458 } else if (ret < 0 && errno != EINVAL) { 459 warn("fpathconf(..., _PC_ACL_NFS4) failed for %s", source_dir); 460 return (1); 461 } 462 if (acl_supported == 0) { 463 ret = pathconf(source_dir, _PC_ACL_EXTENDED); 464 if (ret > 0) { 465 acl_supported = 1; 466 acl_type = ACL_TYPE_ACCESS; 467 } else if (ret < 0 && errno != EINVAL) { 468 warn("fpathconf(..., _PC_ACL_EXTENDED) failed for %s", 469 source_dir); 470 return (1); 471 } 472 } 473 if (acl_supported == 0) 474 return (0); 475 476 /* 477 * If the file is a link we will not follow it. 478 */ 479 if (S_ISLNK(fs->st_mode)) { 480 aclgetf = acl_get_link_np; 481 aclsetf = acl_set_link_np; 482 } else { 483 aclgetf = acl_get_file; 484 aclsetf = acl_set_file; 485 } 486 if (acl_type == ACL_TYPE_ACCESS) { 487 /* 488 * Even if there is no ACL_TYPE_DEFAULT entry here, a zero 489 * size ACL will be returned. So it is not safe to simply 490 * check the pointer to see if the default ACL is present. 491 */ 492 acl = aclgetf(source_dir, ACL_TYPE_DEFAULT); 493 if (acl == NULL) { 494 warn("failed to get default acl entries on %s", 495 source_dir); 496 return (1); 497 } 498 aclp = &acl->ats_acl; 499 if (aclp->acl_cnt != 0 && aclsetf(dest_dir, 500 ACL_TYPE_DEFAULT, acl) < 0) { 501 warn("failed to set default acl entries on %s", 502 dest_dir); 503 acl_free(acl); 504 return (1); 505 } 506 acl_free(acl); 507 } 508 acl = aclgetf(source_dir, acl_type); 509 if (acl == NULL) { 510 warn("failed to get acl entries on %s", source_dir); 511 return (1); 512 } 513 if (acl_is_trivial_np(acl, &trivial)) { 514 warn("acl_is_trivial() failed on %s", source_dir); 515 acl_free(acl); 516 return (1); 517 } 518 if (trivial) { 519 acl_free(acl); 520 return (0); 521 } 522 if (aclsetf(dest_dir, acl_type, acl) < 0) { 523 warn("failed to set acl entries on %s", dest_dir); 524 acl_free(acl); 525 return (1); 526 } 527 acl_free(acl); 528 return (0); 529 } 530 531 void 532 usage(void) 533 { 534 535 (void)fprintf(stderr, "%s\n%s\n", 536 "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-alpsvx] " 537 "source_file target_file", 538 " cp [-R [-H | -L | -P]] [-f | -i | -n] [-alpsvx] " 539 "source_file ... " 540 "target_directory"); 541 exit(EX_USAGE); 542 } 543