1 /*- 2 * Copyright (c) 1991, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifndef lint 31 #if 0 32 static char sccsid[] = "@(#)utils.c 8.3 (Berkeley) 4/1/94"; 33 #endif 34 #endif /* not lint */ 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/types.h> 39 #include <sys/acl.h> 40 #include <sys/param.h> 41 #include <sys/stat.h> 42 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 43 #include <sys/mman.h> 44 #endif 45 46 #include <err.h> 47 #include <errno.h> 48 #include <fcntl.h> 49 #include <fts.h> 50 #include <limits.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <sysexits.h> 54 #include <unistd.h> 55 56 #include "extern.h" 57 58 #define cp_pct(x, y) ((y == 0) ? 0 : (int)(100.0 * (x) / (y))) 59 60 int 61 copy_file(const FTSENT *entp, int dne) 62 { 63 static char buf[MAXBSIZE]; 64 struct stat *fs; 65 ssize_t wcount; 66 size_t wresid; 67 off_t wtotal; 68 int ch, checkch, from_fd = 0, rcount, rval, to_fd = 0; 69 char *bufp; 70 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 71 char *p; 72 #endif 73 74 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 75 warn("%s", entp->fts_path); 76 return (1); 77 } 78 79 fs = entp->fts_statp; 80 81 /* 82 * If the file exists and we're interactive, verify with the user. 83 * If the file DNE, set the mode to be the from file, minus setuid 84 * bits, modified by the umask; arguably wrong, but it makes copying 85 * executables work right and it's been that way forever. (The 86 * other choice is 666 or'ed with the execute bits on the from file 87 * modified by the umask.) 88 */ 89 if (!dne) { 90 #define YESNO "(y/n [n]) " 91 if (nflag) { 92 if (vflag) 93 printf("%s not overwritten\n", to.p_path); 94 (void)close(from_fd); 95 return (0); 96 } else if (iflag) { 97 (void)fprintf(stderr, "overwrite %s? %s", 98 to.p_path, YESNO); 99 checkch = ch = getchar(); 100 while (ch != '\n' && ch != EOF) 101 ch = getchar(); 102 if (checkch != 'y' && checkch != 'Y') { 103 (void)close(from_fd); 104 (void)fprintf(stderr, "not overwritten\n"); 105 return (1); 106 } 107 } 108 109 if (fflag) { 110 /* remove existing destination file name, 111 * create a new file */ 112 (void)unlink(to.p_path); 113 if (!lflag) 114 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 115 fs->st_mode & ~(S_ISUID | S_ISGID)); 116 } else { 117 if (!lflag) 118 /* overwrite existing destination file name */ 119 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 120 } 121 } else { 122 if (!lflag) 123 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 124 fs->st_mode & ~(S_ISUID | S_ISGID)); 125 } 126 127 if (to_fd == -1) { 128 warn("%s", to.p_path); 129 (void)close(from_fd); 130 return (1); 131 } 132 133 rval = 0; 134 135 if (!lflag) { 136 /* 137 * Mmap and write if less than 8M (the limit is so we don't totally 138 * trash memory on big files. This is really a minor hack, but it 139 * wins some CPU back. 140 */ 141 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 142 if (S_ISREG(fs->st_mode) && fs->st_size > 0 && 143 fs->st_size <= 8 * 1048576) { 144 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 145 MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) { 146 warn("%s", entp->fts_path); 147 rval = 1; 148 } else { 149 wtotal = 0; 150 for (bufp = p, wresid = fs->st_size; ; 151 bufp += wcount, wresid -= (size_t)wcount) { 152 wcount = write(to_fd, bufp, wresid); 153 if (wcount <= 0) 154 break; 155 wtotal += wcount; 156 if (info) { 157 info = 0; 158 (void)fprintf(stderr, 159 "%s -> %s %3d%%\n", 160 entp->fts_path, to.p_path, 161 cp_pct(wtotal, fs->st_size)); 162 } 163 if (wcount >= (ssize_t)wresid) 164 break; 165 } 166 if (wcount != (ssize_t)wresid) { 167 warn("%s", to.p_path); 168 rval = 1; 169 } 170 /* Some systems don't unmap on close(2). */ 171 if (munmap(p, fs->st_size) < 0) { 172 warn("%s", entp->fts_path); 173 rval = 1; 174 } 175 } 176 } else 177 #endif 178 { 179 wtotal = 0; 180 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 181 for (bufp = buf, wresid = rcount; ; 182 bufp += wcount, wresid -= wcount) { 183 wcount = write(to_fd, bufp, wresid); 184 if (wcount <= 0) 185 break; 186 wtotal += wcount; 187 if (info) { 188 info = 0; 189 (void)fprintf(stderr, 190 "%s -> %s %3d%%\n", 191 entp->fts_path, to.p_path, 192 cp_pct(wtotal, fs->st_size)); 193 } 194 if (wcount >= (ssize_t)wresid) 195 break; 196 } 197 if (wcount != (ssize_t)wresid) { 198 warn("%s", to.p_path); 199 rval = 1; 200 break; 201 } 202 } 203 if (rcount < 0) { 204 warn("%s", entp->fts_path); 205 rval = 1; 206 } 207 } 208 } else { 209 if (link(entp->fts_path, to.p_path)) { 210 warn("%s", to.p_path); 211 rval = 1; 212 } 213 } 214 215 /* 216 * Don't remove the target even after an error. The target might 217 * not be a regular file, or its attributes might be important, 218 * or its contents might be irreplaceable. It would only be safe 219 * to remove it if we created it and its length is 0. 220 */ 221 222 if (!lflag) { 223 if (pflag && setfile(fs, to_fd)) 224 rval = 1; 225 if (pflag && preserve_fd_acls(from_fd, to_fd) != 0) 226 rval = 1; 227 if (close(to_fd)) { 228 warn("%s", to.p_path); 229 rval = 1; 230 } 231 } 232 233 (void)close(from_fd); 234 235 return (rval); 236 } 237 238 int 239 copy_link(const FTSENT *p, int exists) 240 { 241 int len; 242 char llink[PATH_MAX]; 243 244 if ((len = readlink(p->fts_path, llink, sizeof(llink) - 1)) == -1) { 245 warn("readlink: %s", p->fts_path); 246 return (1); 247 } 248 llink[len] = '\0'; 249 if (exists && unlink(to.p_path)) { 250 warn("unlink: %s", to.p_path); 251 return (1); 252 } 253 if (symlink(llink, to.p_path)) { 254 warn("symlink: %s", llink); 255 return (1); 256 } 257 return (pflag ? setfile(p->fts_statp, -1) : 0); 258 } 259 260 int 261 copy_fifo(struct stat *from_stat, int exists) 262 { 263 if (exists && unlink(to.p_path)) { 264 warn("unlink: %s", to.p_path); 265 return (1); 266 } 267 if (mkfifo(to.p_path, from_stat->st_mode)) { 268 warn("mkfifo: %s", to.p_path); 269 return (1); 270 } 271 return (pflag ? setfile(from_stat, -1) : 0); 272 } 273 274 int 275 copy_special(struct stat *from_stat, int exists) 276 { 277 if (exists && unlink(to.p_path)) { 278 warn("unlink: %s", to.p_path); 279 return (1); 280 } 281 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 282 warn("mknod: %s", to.p_path); 283 return (1); 284 } 285 return (pflag ? setfile(from_stat, -1) : 0); 286 } 287 288 int 289 setfile(struct stat *fs, int fd) 290 { 291 static struct timeval tv[2]; 292 struct stat ts; 293 int rval, gotstat, islink, fdval; 294 295 rval = 0; 296 fdval = fd != -1; 297 islink = !fdval && S_ISLNK(fs->st_mode); 298 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | 299 S_IRWXU | S_IRWXG | S_IRWXO; 300 301 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 302 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 303 if (islink ? lutimes(to.p_path, tv) : utimes(to.p_path, tv)) { 304 warn("%sutimes: %s", islink ? "l" : "", to.p_path); 305 rval = 1; 306 } 307 if (fdval ? fstat(fd, &ts) : 308 (islink ? lstat(to.p_path, &ts) : stat(to.p_path, &ts))) 309 gotstat = 0; 310 else { 311 gotstat = 1; 312 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX | 313 S_IRWXU | S_IRWXG | S_IRWXO; 314 } 315 /* 316 * Changing the ownership probably won't succeed, unless we're root 317 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 318 * the mode; current BSD behavior is to remove all setuid bits on 319 * chown. If chown fails, lose setuid/setgid bits. 320 */ 321 if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid) 322 if (fdval ? fchown(fd, fs->st_uid, fs->st_gid) : 323 (islink ? lchown(to.p_path, fs->st_uid, fs->st_gid) : 324 chown(to.p_path, fs->st_uid, fs->st_gid))) { 325 if (errno != EPERM) { 326 warn("chown: %s", to.p_path); 327 rval = 1; 328 } 329 fs->st_mode &= ~(S_ISUID | S_ISGID); 330 } 331 332 if (!gotstat || fs->st_mode != ts.st_mode) 333 if (fdval ? fchmod(fd, fs->st_mode) : 334 (islink ? lchmod(to.p_path, fs->st_mode) : 335 chmod(to.p_path, fs->st_mode))) { 336 warn("chmod: %s", to.p_path); 337 rval = 1; 338 } 339 340 if (!gotstat || fs->st_flags != ts.st_flags) 341 if (fdval ? 342 fchflags(fd, fs->st_flags) : 343 (islink ? (errno = ENOSYS) : 344 chflags(to.p_path, fs->st_flags))) { 345 warn("chflags: %s", to.p_path); 346 rval = 1; 347 } 348 349 return (rval); 350 } 351 352 int 353 preserve_fd_acls(int source_fd, int dest_fd) 354 { 355 struct acl *aclp; 356 acl_t acl; 357 358 if (fpathconf(source_fd, _PC_ACL_EXTENDED) != 1 || 359 fpathconf(dest_fd, _PC_ACL_EXTENDED) != 1) 360 return (0); 361 acl = acl_get_fd(source_fd); 362 if (acl == NULL) { 363 warn("failed to get acl entries while setting %s", to.p_path); 364 return (1); 365 } 366 aclp = &acl->ats_acl; 367 if (aclp->acl_cnt == 3) 368 return (0); 369 if (acl_set_fd(dest_fd, acl) < 0) { 370 warn("failed to set acl entries for %s", to.p_path); 371 return (1); 372 } 373 return (0); 374 } 375 376 int 377 preserve_dir_acls(struct stat *fs, char *source_dir, char *dest_dir) 378 { 379 acl_t (*aclgetf)(const char *, acl_type_t); 380 int (*aclsetf)(const char *, acl_type_t, acl_t); 381 struct acl *aclp; 382 acl_t acl; 383 384 if (pathconf(source_dir, _PC_ACL_EXTENDED) != 1 || 385 pathconf(dest_dir, _PC_ACL_EXTENDED) != 1) 386 return (0); 387 /* 388 * If the file is a link we will not follow it 389 */ 390 if (S_ISLNK(fs->st_mode)) { 391 aclgetf = acl_get_link_np; 392 aclsetf = acl_set_link_np; 393 } else { 394 aclgetf = acl_get_file; 395 aclsetf = acl_set_file; 396 } 397 /* 398 * Even if there is no ACL_TYPE_DEFAULT entry here, a zero 399 * size ACL will be returned. So it is not safe to simply 400 * check the pointer to see if the default ACL is present. 401 */ 402 acl = aclgetf(source_dir, ACL_TYPE_DEFAULT); 403 if (acl == NULL) { 404 warn("failed to get default acl entries on %s", 405 source_dir); 406 return (1); 407 } 408 aclp = &acl->ats_acl; 409 if (aclp->acl_cnt != 0 && aclsetf(dest_dir, 410 ACL_TYPE_DEFAULT, acl) < 0) { 411 warn("failed to set default acl entries on %s", 412 dest_dir); 413 return (1); 414 } 415 acl = aclgetf(source_dir, ACL_TYPE_ACCESS); 416 if (acl == NULL) { 417 warn("failed to get acl entries on %s", source_dir); 418 return (1); 419 } 420 aclp = &acl->ats_acl; 421 if (aclsetf(dest_dir, ACL_TYPE_ACCESS, acl) < 0) { 422 warn("failed to set acl entries on %s", dest_dir); 423 return (1); 424 } 425 return (0); 426 } 427 428 void 429 usage(void) 430 { 431 432 (void)fprintf(stderr, "%s\n%s\n", 433 "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-alpv] source_file target_file", 434 " cp [-R [-H | -L | -P]] [-f | -i | -n] [-alpv] source_file ... " 435 "target_directory"); 436 exit(EX_USAGE); 437 } 438