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 *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 from_fd = to_fd = -1; 110 if (!lflag && !sflag && 111 (from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 112 warn("%s", entp->fts_path); 113 return (1); 114 } 115 116 fs = entp->fts_statp; 117 118 /* 119 * If the file exists and we're interactive, verify with the user. 120 * If the file DNE, set the mode to be the from file, minus setuid 121 * bits, modified by the umask; arguably wrong, but it makes copying 122 * executables work right and it's been that way forever. (The 123 * other choice is 666 or'ed with the execute bits on the from file 124 * modified by the umask.) 125 */ 126 if (!dne) { 127 if (nflag) { 128 if (vflag) 129 printf("%s not overwritten\n", to.p_path); 130 rval = 1; 131 goto done; 132 } else if (iflag) { 133 (void)fprintf(stderr, "overwrite %s? %s", 134 to.p_path, YESNO); 135 checkch = ch = getchar(); 136 while (ch != '\n' && ch != EOF) 137 ch = getchar(); 138 if (checkch != 'y' && checkch != 'Y') { 139 (void)fprintf(stderr, "not overwritten\n"); 140 rval = 1; 141 goto done; 142 } 143 } 144 145 if (fflag) { 146 /* remove existing destination file */ 147 (void)unlink(to.p_path); 148 dne = 1; 149 } 150 } 151 152 rval = 0; 153 154 if (lflag) { 155 if (link(entp->fts_path, to.p_path) != 0) { 156 warn("%s", to.p_path); 157 rval = 1; 158 } 159 goto done; 160 } 161 162 if (sflag) { 163 if (symlink(entp->fts_path, to.p_path) != 0) { 164 warn("%s", to.p_path); 165 rval = 1; 166 } 167 goto done; 168 } 169 170 if (!dne) { 171 /* overwrite existing destination file */ 172 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 173 } else { 174 /* create new destination file */ 175 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 176 fs->st_mode & ~(S_ISUID | S_ISGID)); 177 } 178 if (to_fd == -1) { 179 warn("%s", to.p_path); 180 rval = 1; 181 goto done; 182 } 183 184 wtotal = 0; 185 do { 186 if (use_copy_file_range) { 187 wcount = copy_file_range(from_fd, NULL, 188 to_fd, NULL, SSIZE_MAX, 0); 189 if (wcount < 0 && errno == EINVAL) { 190 /* probably a non-seekable descriptor */ 191 use_copy_file_range = 0; 192 } 193 } 194 if (!use_copy_file_range) { 195 wcount = copy_fallback(from_fd, to_fd); 196 } 197 wtotal += wcount; 198 if (info) { 199 info = 0; 200 (void)fprintf(stderr, 201 "%s -> %s %3d%%\n", 202 entp->fts_path, to.p_path, 203 cp_pct(wtotal, fs->st_size)); 204 } 205 } while (wcount > 0); 206 if (wcount < 0) { 207 warn("%s", entp->fts_path); 208 rval = 1; 209 } 210 211 /* 212 * Don't remove the target even after an error. The target might 213 * not be a regular file, or its attributes might be important, 214 * or its contents might be irreplaceable. It would only be safe 215 * to remove it if we created it and its length is 0. 216 */ 217 if (pflag && setfile(fs, to_fd)) 218 rval = 1; 219 if (pflag && preserve_fd_acls(from_fd, to_fd) != 0) 220 rval = 1; 221 if (close(to_fd)) { 222 warn("%s", to.p_path); 223 rval = 1; 224 } 225 226 done: 227 if (from_fd != -1) 228 (void)close(from_fd); 229 return (rval); 230 } 231 232 int 233 copy_link(const FTSENT *p, int exists) 234 { 235 ssize_t len; 236 char llink[PATH_MAX]; 237 238 if (exists && nflag) { 239 if (vflag) 240 printf("%s not overwritten\n", to.p_path); 241 return (1); 242 } 243 if ((len = readlink(p->fts_path, llink, sizeof(llink) - 1)) == -1) { 244 warn("readlink: %s", p->fts_path); 245 return (1); 246 } 247 llink[len] = '\0'; 248 if (exists && unlink(to.p_path)) { 249 warn("unlink: %s", to.p_path); 250 return (1); 251 } 252 if (symlink(llink, to.p_path)) { 253 warn("symlink: %s", llink); 254 return (1); 255 } 256 return (pflag ? setfile(p->fts_statp, -1) : 0); 257 } 258 259 int 260 copy_fifo(struct stat *from_stat, int exists) 261 { 262 263 if (exists && nflag) { 264 if (vflag) 265 printf("%s not overwritten\n", to.p_path); 266 return (1); 267 } 268 if (exists && unlink(to.p_path)) { 269 warn("unlink: %s", to.p_path); 270 return (1); 271 } 272 if (mkfifo(to.p_path, from_stat->st_mode)) { 273 warn("mkfifo: %s", to.p_path); 274 return (1); 275 } 276 return (pflag ? setfile(from_stat, -1) : 0); 277 } 278 279 int 280 copy_special(struct stat *from_stat, int exists) 281 { 282 283 if (exists && nflag) { 284 if (vflag) 285 printf("%s not overwritten\n", to.p_path); 286 return (1); 287 } 288 if (exists && unlink(to.p_path)) { 289 warn("unlink: %s", to.p_path); 290 return (1); 291 } 292 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 293 warn("mknod: %s", to.p_path); 294 return (1); 295 } 296 return (pflag ? setfile(from_stat, -1) : 0); 297 } 298 299 int 300 setfile(struct stat *fs, int fd) 301 { 302 static struct timespec tspec[2]; 303 struct stat ts; 304 int rval, gotstat, islink, fdval; 305 306 rval = 0; 307 fdval = fd != -1; 308 islink = !fdval && S_ISLNK(fs->st_mode); 309 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | 310 S_IRWXU | S_IRWXG | S_IRWXO; 311 312 tspec[0] = fs->st_atim; 313 tspec[1] = fs->st_mtim; 314 if (fdval ? futimens(fd, tspec) : utimensat(AT_FDCWD, to.p_path, tspec, 315 islink ? AT_SYMLINK_NOFOLLOW : 0)) { 316 warn("utimensat: %s", to.p_path); 317 rval = 1; 318 } 319 if (fdval ? fstat(fd, &ts) : 320 (islink ? lstat(to.p_path, &ts) : stat(to.p_path, &ts))) 321 gotstat = 0; 322 else { 323 gotstat = 1; 324 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX | 325 S_IRWXU | S_IRWXG | S_IRWXO; 326 } 327 /* 328 * Changing the ownership probably won't succeed, unless we're root 329 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 330 * the mode; current BSD behavior is to remove all setuid bits on 331 * chown. If chown fails, lose setuid/setgid bits. 332 */ 333 if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid) 334 if (fdval ? fchown(fd, fs->st_uid, fs->st_gid) : 335 (islink ? lchown(to.p_path, fs->st_uid, fs->st_gid) : 336 chown(to.p_path, fs->st_uid, fs->st_gid))) { 337 if (errno != EPERM) { 338 warn("chown: %s", to.p_path); 339 rval = 1; 340 } 341 fs->st_mode &= ~(S_ISUID | S_ISGID); 342 } 343 344 if (!gotstat || fs->st_mode != ts.st_mode) 345 if (fdval ? fchmod(fd, fs->st_mode) : 346 (islink ? lchmod(to.p_path, fs->st_mode) : 347 chmod(to.p_path, fs->st_mode))) { 348 warn("chmod: %s", to.p_path); 349 rval = 1; 350 } 351 352 if (!Nflag && (!gotstat || fs->st_flags != ts.st_flags)) 353 if (fdval ? 354 fchflags(fd, fs->st_flags) : 355 (islink ? lchflags(to.p_path, fs->st_flags) : 356 chflags(to.p_path, fs->st_flags))) { 357 /* 358 * NFS doesn't support chflags; ignore errors unless 359 * there's reason to believe we're losing bits. (Note, 360 * this still won't be right if the server supports 361 * flags and we were trying to *remove* flags on a file 362 * that we copied, i.e., that we didn't create.) 363 */ 364 if (errno != EOPNOTSUPP || fs->st_flags != 0) { 365 warn("chflags: %s", to.p_path); 366 rval = 1; 367 } 368 } 369 370 return (rval); 371 } 372 373 int 374 preserve_fd_acls(int source_fd, int dest_fd) 375 { 376 acl_t acl; 377 acl_type_t acl_type; 378 int acl_supported = 0, ret, trivial; 379 380 ret = fpathconf(source_fd, _PC_ACL_NFS4); 381 if (ret > 0 ) { 382 acl_supported = 1; 383 acl_type = ACL_TYPE_NFS4; 384 } else if (ret < 0 && errno != EINVAL) { 385 warn("fpathconf(..., _PC_ACL_NFS4) failed for %s", to.p_path); 386 return (1); 387 } 388 if (acl_supported == 0) { 389 ret = fpathconf(source_fd, _PC_ACL_EXTENDED); 390 if (ret > 0 ) { 391 acl_supported = 1; 392 acl_type = ACL_TYPE_ACCESS; 393 } else if (ret < 0 && errno != EINVAL) { 394 warn("fpathconf(..., _PC_ACL_EXTENDED) failed for %s", 395 to.p_path); 396 return (1); 397 } 398 } 399 if (acl_supported == 0) 400 return (0); 401 402 acl = acl_get_fd_np(source_fd, acl_type); 403 if (acl == NULL) { 404 warn("failed to get acl entries while setting %s", to.p_path); 405 return (1); 406 } 407 if (acl_is_trivial_np(acl, &trivial)) { 408 warn("acl_is_trivial() failed for %s", to.p_path); 409 acl_free(acl); 410 return (1); 411 } 412 if (trivial) { 413 acl_free(acl); 414 return (0); 415 } 416 if (acl_set_fd_np(dest_fd, acl, acl_type) < 0) { 417 warn("failed to set acl entries for %s", to.p_path); 418 acl_free(acl); 419 return (1); 420 } 421 acl_free(acl); 422 return (0); 423 } 424 425 int 426 preserve_dir_acls(struct stat *fs, char *source_dir, char *dest_dir) 427 { 428 acl_t (*aclgetf)(const char *, acl_type_t); 429 int (*aclsetf)(const char *, acl_type_t, acl_t); 430 struct acl *aclp; 431 acl_t acl; 432 acl_type_t acl_type; 433 int acl_supported = 0, ret, trivial; 434 435 ret = pathconf(source_dir, _PC_ACL_NFS4); 436 if (ret > 0) { 437 acl_supported = 1; 438 acl_type = ACL_TYPE_NFS4; 439 } else if (ret < 0 && errno != EINVAL) { 440 warn("fpathconf(..., _PC_ACL_NFS4) failed for %s", source_dir); 441 return (1); 442 } 443 if (acl_supported == 0) { 444 ret = pathconf(source_dir, _PC_ACL_EXTENDED); 445 if (ret > 0) { 446 acl_supported = 1; 447 acl_type = ACL_TYPE_ACCESS; 448 } else if (ret < 0 && errno != EINVAL) { 449 warn("fpathconf(..., _PC_ACL_EXTENDED) failed for %s", 450 source_dir); 451 return (1); 452 } 453 } 454 if (acl_supported == 0) 455 return (0); 456 457 /* 458 * If the file is a link we will not follow it. 459 */ 460 if (S_ISLNK(fs->st_mode)) { 461 aclgetf = acl_get_link_np; 462 aclsetf = acl_set_link_np; 463 } else { 464 aclgetf = acl_get_file; 465 aclsetf = acl_set_file; 466 } 467 if (acl_type == ACL_TYPE_ACCESS) { 468 /* 469 * Even if there is no ACL_TYPE_DEFAULT entry here, a zero 470 * size ACL will be returned. So it is not safe to simply 471 * check the pointer to see if the default ACL is present. 472 */ 473 acl = aclgetf(source_dir, ACL_TYPE_DEFAULT); 474 if (acl == NULL) { 475 warn("failed to get default acl entries on %s", 476 source_dir); 477 return (1); 478 } 479 aclp = &acl->ats_acl; 480 if (aclp->acl_cnt != 0 && aclsetf(dest_dir, 481 ACL_TYPE_DEFAULT, acl) < 0) { 482 warn("failed to set default acl entries on %s", 483 dest_dir); 484 acl_free(acl); 485 return (1); 486 } 487 acl_free(acl); 488 } 489 acl = aclgetf(source_dir, acl_type); 490 if (acl == NULL) { 491 warn("failed to get acl entries on %s", source_dir); 492 return (1); 493 } 494 if (acl_is_trivial_np(acl, &trivial)) { 495 warn("acl_is_trivial() failed on %s", source_dir); 496 acl_free(acl); 497 return (1); 498 } 499 if (trivial) { 500 acl_free(acl); 501 return (0); 502 } 503 if (aclsetf(dest_dir, acl_type, acl) < 0) { 504 warn("failed to set acl entries on %s", dest_dir); 505 acl_free(acl); 506 return (1); 507 } 508 acl_free(acl); 509 return (0); 510 } 511 512 void 513 usage(void) 514 { 515 516 (void)fprintf(stderr, "%s\n%s\n", 517 "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-alpsvx] " 518 "source_file target_file", 519 " cp [-R [-H | -L | -P]] [-f | -i | -n] [-alpsvx] " 520 "source_file ... " 521 "target_directory"); 522 exit(EX_USAGE); 523 } 524