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