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 #define cp_pct(x,y) (int)(100.0 * (double)(x) / (double)(y)) 58 59 int 60 copy_file(const FTSENT *entp, int dne) 61 { 62 static char buf[MAXBSIZE]; 63 struct stat *fs; 64 int ch, checkch, from_fd = 0, rcount, rval, to_fd = 0; 65 ssize_t wcount; 66 size_t wresid; 67 size_t wtotal; 68 char *bufp; 69 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 70 char *p; 71 #endif 72 73 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 74 warn("%s", entp->fts_path); 75 return (1); 76 } 77 78 fs = entp->fts_statp; 79 80 /* 81 * If the file exists and we're interactive, verify with the user. 82 * If the file DNE, set the mode to be the from file, minus setuid 83 * bits, modified by the umask; arguably wrong, but it makes copying 84 * executables work right and it's been that way forever. (The 85 * other choice is 666 or'ed with the execute bits on the from file 86 * modified by the umask.) 87 */ 88 if (!dne) { 89 #define YESNO "(y/n [n]) " 90 if (nflag) { 91 if (vflag) 92 printf("%s not overwritten\n", to.p_path); 93 (void)close(from_fd); 94 return (0); 95 } else if (iflag) { 96 (void)fprintf(stderr, "overwrite %s? %s", 97 to.p_path, YESNO); 98 checkch = ch = getchar(); 99 while (ch != '\n' && ch != EOF) 100 ch = getchar(); 101 if (checkch != 'y' && checkch != 'Y') { 102 (void)close(from_fd); 103 (void)fprintf(stderr, "not overwritten\n"); 104 return (1); 105 } 106 } 107 108 if (fflag) { 109 /* remove existing destination file name, 110 * create a new file */ 111 (void)unlink(to.p_path); 112 if (!lflag) 113 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 114 fs->st_mode & ~(S_ISUID | S_ISGID)); 115 } else { 116 if (!lflag) 117 /* overwrite existing destination file name */ 118 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 119 } 120 } else { 121 if (!lflag) 122 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 123 fs->st_mode & ~(S_ISUID | S_ISGID)); 124 } 125 126 if (to_fd == -1) { 127 warn("%s", to.p_path); 128 (void)close(from_fd); 129 return (1); 130 } 131 132 rval = 0; 133 134 if (!lflag) { 135 /* 136 * Mmap and write if less than 8M (the limit is so we don't totally 137 * trash memory on big files. This is really a minor hack, but it 138 * wins some CPU back. 139 */ 140 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 141 if (S_ISREG(fs->st_mode) && fs->st_size > 0 && 142 fs->st_size <= 8 * 1048576) { 143 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 144 MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) { 145 warn("%s", entp->fts_path); 146 rval = 1; 147 } else { 148 wtotal = 0; 149 for (bufp = p, wresid = fs->st_size; ; 150 bufp += wcount, wresid -= (size_t)wcount) { 151 wcount = write(to_fd, bufp, wresid); 152 wtotal += wcount; 153 if (info) { 154 info = 0; 155 (void)fprintf(stderr, 156 "%s -> %s %3d%%\n", 157 entp->fts_path, to.p_path, 158 cp_pct(wtotal, fs->st_size)); 159 160 } 161 if (wcount >= (ssize_t)wresid || wcount <= 0) 162 break; 163 } 164 if (wcount != (ssize_t)wresid) { 165 warn("%s", to.p_path); 166 rval = 1; 167 } 168 /* Some systems don't unmap on close(2). */ 169 if (munmap(p, fs->st_size) < 0) { 170 warn("%s", entp->fts_path); 171 rval = 1; 172 } 173 } 174 } else 175 #endif 176 { 177 wtotal = 0; 178 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 179 for (bufp = buf, wresid = rcount; ; 180 bufp += wcount, wresid -= wcount) { 181 wcount = write(to_fd, bufp, wresid); 182 wtotal += wcount; 183 if (info) { 184 info = 0; 185 (void)fprintf(stderr, 186 "%s -> %s %3d%%\n", 187 entp->fts_path, to.p_path, 188 cp_pct(wtotal, fs->st_size)); 189 190 } 191 if (wcount >= (ssize_t)wresid || wcount <= 0) 192 break; 193 } 194 if (wcount != (ssize_t)wresid) { 195 warn("%s", to.p_path); 196 rval = 1; 197 break; 198 } 199 } 200 if (rcount < 0) { 201 warn("%s", entp->fts_path); 202 rval = 1; 203 } 204 } 205 } else { 206 if (link(entp->fts_path, to.p_path)) { 207 warn("%s", to.p_path); 208 rval = 1; 209 } 210 } 211 (void)close(from_fd); 212 213 /* 214 * Don't remove the target even after an error. The target might 215 * not be a regular file, or its attributes might be important, 216 * or its contents might be irreplaceable. It would only be safe 217 * to remove it if we created it and its length is 0. 218 */ 219 220 if (!lflag) { 221 if (pflag && setfile(fs, to_fd)) 222 rval = 1; 223 if (pflag && preserve_fd_acls(from_fd, to_fd) != 0) 224 rval = 1; 225 (void)close(from_fd); 226 if (close(to_fd)) { 227 warn("%s", to.p_path); 228 rval = 1; 229 } 230 } 231 return (rval); 232 } 233 234 int 235 copy_link(const FTSENT *p, int exists) 236 { 237 int len; 238 char llink[PATH_MAX]; 239 240 if ((len = readlink(p->fts_path, llink, sizeof(llink) - 1)) == -1) { 241 warn("readlink: %s", p->fts_path); 242 return (1); 243 } 244 llink[len] = '\0'; 245 if (exists && unlink(to.p_path)) { 246 warn("unlink: %s", to.p_path); 247 return (1); 248 } 249 if (symlink(llink, to.p_path)) { 250 warn("symlink: %s", llink); 251 return (1); 252 } 253 return (pflag ? setfile(p->fts_statp, -1) : 0); 254 } 255 256 int 257 copy_fifo(struct stat *from_stat, int exists) 258 { 259 if (exists && unlink(to.p_path)) { 260 warn("unlink: %s", to.p_path); 261 return (1); 262 } 263 if (mkfifo(to.p_path, from_stat->st_mode)) { 264 warn("mkfifo: %s", to.p_path); 265 return (1); 266 } 267 return (pflag ? setfile(from_stat, -1) : 0); 268 } 269 270 int 271 copy_special(struct stat *from_stat, int exists) 272 { 273 if (exists && unlink(to.p_path)) { 274 warn("unlink: %s", to.p_path); 275 return (1); 276 } 277 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 278 warn("mknod: %s", to.p_path); 279 return (1); 280 } 281 return (pflag ? setfile(from_stat, -1) : 0); 282 } 283 284 int 285 setfile(struct stat *fs, int fd) 286 { 287 static struct timeval tv[2]; 288 struct stat ts; 289 int rval, gotstat, islink, fdval; 290 291 rval = 0; 292 fdval = fd != -1; 293 islink = !fdval && S_ISLNK(fs->st_mode); 294 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | 295 S_IRWXU | S_IRWXG | S_IRWXO; 296 297 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 298 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 299 if (islink ? lutimes(to.p_path, tv) : utimes(to.p_path, tv)) { 300 warn("%sutimes: %s", islink ? "l" : "", to.p_path); 301 rval = 1; 302 } 303 if (fdval ? fstat(fd, &ts) : 304 (islink ? lstat(to.p_path, &ts) : stat(to.p_path, &ts))) 305 gotstat = 0; 306 else { 307 gotstat = 1; 308 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX | 309 S_IRWXU | S_IRWXG | S_IRWXO; 310 } 311 /* 312 * Changing the ownership probably won't succeed, unless we're root 313 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 314 * the mode; current BSD behavior is to remove all setuid bits on 315 * chown. If chown fails, lose setuid/setgid bits. 316 */ 317 if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid) 318 if (fdval ? fchown(fd, fs->st_uid, fs->st_gid) : 319 (islink ? lchown(to.p_path, fs->st_uid, fs->st_gid) : 320 chown(to.p_path, fs->st_uid, fs->st_gid))) { 321 if (errno != EPERM) { 322 warn("chown: %s", to.p_path); 323 rval = 1; 324 } 325 fs->st_mode &= ~(S_ISUID | S_ISGID); 326 } 327 328 if (!gotstat || fs->st_mode != ts.st_mode) 329 if (fdval ? fchmod(fd, fs->st_mode) : 330 (islink ? lchmod(to.p_path, fs->st_mode) : 331 chmod(to.p_path, fs->st_mode))) { 332 warn("chmod: %s", to.p_path); 333 rval = 1; 334 } 335 336 if (!gotstat || fs->st_flags != ts.st_flags) 337 if (fdval ? 338 fchflags(fd, fs->st_flags) : 339 (islink ? (errno = ENOSYS) : 340 chflags(to.p_path, fs->st_flags))) { 341 warn("chflags: %s", to.p_path); 342 rval = 1; 343 } 344 345 return (rval); 346 } 347 348 int 349 preserve_fd_acls(int source_fd, int dest_fd) 350 { 351 struct acl *aclp; 352 acl_t acl; 353 354 if (fpathconf(source_fd, _PC_ACL_EXTENDED) != 1 || 355 fpathconf(dest_fd, _PC_ACL_EXTENDED) != 1) 356 return (0); 357 acl = acl_get_fd(source_fd); 358 if (acl == NULL) { 359 warn("failed to get acl entries while setting %s", to.p_path); 360 return (1); 361 } 362 aclp = &acl->ats_acl; 363 if (aclp->acl_cnt == 3) 364 return (0); 365 if (acl_set_fd(dest_fd, acl) < 0) { 366 warn("failed to set acl entries for %s", to.p_path); 367 return (1); 368 } 369 return (0); 370 } 371 372 int 373 preserve_dir_acls(struct stat *fs, char *source_dir, char *dest_dir) 374 { 375 acl_t (*aclgetf)(const char *, acl_type_t); 376 int (*aclsetf)(const char *, acl_type_t, acl_t); 377 struct acl *aclp; 378 acl_t acl; 379 380 if (pathconf(source_dir, _PC_ACL_EXTENDED) != 1 || 381 pathconf(dest_dir, _PC_ACL_EXTENDED) != 1) 382 return (0); 383 /* 384 * If the file is a link we will not follow it 385 */ 386 if (S_ISLNK(fs->st_mode)) { 387 aclgetf = acl_get_link_np; 388 aclsetf = acl_set_link_np; 389 } else { 390 aclgetf = acl_get_file; 391 aclsetf = acl_set_file; 392 } 393 /* 394 * Even if there is no ACL_TYPE_DEFAULT entry here, a zero 395 * size ACL will be returned. So it is not safe to simply 396 * check the pointer to see if the default ACL is present. 397 */ 398 acl = aclgetf(source_dir, ACL_TYPE_DEFAULT); 399 if (acl == NULL) { 400 warn("failed to get default acl entries on %s", 401 source_dir); 402 return (1); 403 } 404 aclp = &acl->ats_acl; 405 if (aclp->acl_cnt != 0 && aclsetf(dest_dir, 406 ACL_TYPE_DEFAULT, acl) < 0) { 407 warn("failed to set default acl entries on %s", 408 dest_dir); 409 return (1); 410 } 411 acl = aclgetf(source_dir, ACL_TYPE_ACCESS); 412 if (acl == NULL) { 413 warn("failed to get acl entries on %s", source_dir); 414 return (1); 415 } 416 aclp = &acl->ats_acl; 417 if (aclsetf(dest_dir, ACL_TYPE_ACCESS, acl) < 0) { 418 warn("failed to set acl entries on %s", dest_dir); 419 return (1); 420 } 421 return (0); 422 } 423 424 void 425 usage(void) 426 { 427 428 (void)fprintf(stderr, "%s\n%s\n", 429 "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-lpv] source_file target_file", 430 " cp [-R [-H | -L | -P]] [-f | -i | -n] [-lpv] source_file ... " 431 "target_directory"); 432 exit(EX_USAGE); 433 } 434