1 /* $NetBSD: utils.c,v 1.41 2012/01/04 15:58:37 christos Exp $ */ 2 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/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)utils.c 8.3 (Berkeley) 4/1/94"; 36 #else 37 __RCSID("$NetBSD: utils.c,v 1.41 2012/01/04 15:58:37 christos Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 #include <sys/mman.h> 42 #include <sys/param.h> 43 #include <sys/stat.h> 44 #include <sys/time.h> 45 #ifndef ANDROID 46 #include <sys/extattr.h> 47 #endif 48 49 #include <err.h> 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <fts.h> 53 #include <stdbool.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <unistd.h> 58 59 #include "extern.h" 60 61 #ifdef ANDROID 62 #define MAXBSIZE 65536 63 #endif 64 65 #define MMAP_MAX_SIZE (8 * 1048576) 66 #define MMAP_MAX_WRITE (64 * 1024) 67 68 int 69 set_utimes(const char *file, struct stat *fs) 70 { 71 static struct timeval tv[2]; 72 73 #ifdef ANDROID 74 tv[0].tv_sec = fs->st_atime; 75 tv[0].tv_usec = 0; 76 tv[1].tv_sec = fs->st_mtime; 77 tv[1].tv_usec = 0; 78 79 if (utimes(file, tv)) { 80 warn("utimes: %s", file); 81 return 1; 82 } 83 #else 84 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 85 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 86 87 if (lutimes(file, tv)) { 88 warn("lutimes: %s", file); 89 return (1); 90 } 91 #endif 92 return (0); 93 } 94 95 struct finfo { 96 const char *from; 97 const char *to; 98 size_t size; 99 }; 100 101 static void 102 progress(const struct finfo *fi, size_t written) 103 { 104 int pcent = (int)((100.0 * written) / fi->size); 105 106 pinfo = 0; 107 (void)fprintf(stderr, "%s => %s %zu/%zu bytes %d%% written\n", 108 fi->from, fi->to, written, fi->size, pcent); 109 } 110 111 int 112 copy_file(FTSENT *entp, int dne) 113 { 114 static char buf[MAXBSIZE]; 115 struct stat to_stat, *fs; 116 int ch, checkch, from_fd, rcount, rval, to_fd, tolnk, wcount; 117 char *p; 118 size_t ptotal = 0; 119 120 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 121 warn("%s", entp->fts_path); 122 return (1); 123 } 124 125 to_fd = -1; 126 fs = entp->fts_statp; 127 tolnk = ((Rflag && !(Lflag || Hflag)) || Pflag); 128 129 /* 130 * If the file exists and we're interactive, verify with the user. 131 * If the file DNE, set the mode to be the from file, minus setuid 132 * bits, modified by the umask; arguably wrong, but it makes copying 133 * executables work right and it's been that way forever. (The 134 * other choice is 666 or'ed with the execute bits on the from file 135 * modified by the umask.) 136 */ 137 if (!dne) { 138 struct stat sb; 139 int sval; 140 141 if (iflag) { 142 (void)fprintf(stderr, "overwrite %s? ", to.p_path); 143 checkch = ch = getchar(); 144 while (ch != '\n' && ch != EOF) 145 ch = getchar(); 146 if (checkch != 'y' && checkch != 'Y') { 147 (void)close(from_fd); 148 return (0); 149 } 150 } 151 152 sval = tolnk ? 153 lstat(to.p_path, &sb) : stat(to.p_path, &sb); 154 if (sval == -1) { 155 warn("stat: %s", to.p_path); 156 (void)close(from_fd); 157 return (1); 158 } 159 160 if (!(tolnk && S_ISLNK(sb.st_mode))) 161 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 162 } else 163 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 164 fs->st_mode & ~(S_ISUID | S_ISGID)); 165 166 if (to_fd == -1 && (fflag || tolnk)) { 167 /* 168 * attempt to remove existing destination file name and 169 * create a new file 170 */ 171 (void)unlink(to.p_path); 172 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 173 fs->st_mode & ~(S_ISUID | S_ISGID)); 174 } 175 176 if (to_fd == -1) { 177 warn("%s", to.p_path); 178 (void)close(from_fd); 179 return (1); 180 } 181 182 rval = 0; 183 184 /* if hard linking then simply close the open fds, link and return */ 185 if (lflag) { 186 (void)close(from_fd); 187 (void)close(to_fd); 188 (void)unlink(to.p_path); 189 if (link(entp->fts_path, to.p_path)) { 190 warn("%s", to.p_path); 191 return (1); 192 } 193 return (0); 194 } 195 /* NOTREACHED */ 196 197 /* 198 * There's no reason to do anything other than close the file 199 * now if it's empty, so let's not bother. 200 */ 201 if (fs->st_size > 0) { 202 struct finfo fi; 203 204 fi.from = entp->fts_path; 205 fi.to = to.p_path; 206 fi.size = (size_t)fs->st_size; 207 208 /* 209 * Mmap and write if less than 8M (the limit is so 210 * we don't totally trash memory on big files). 211 * This is really a minor hack, but it wins some CPU back. 212 */ 213 bool use_read; 214 215 use_read = true; 216 if (fs->st_size <= MMAP_MAX_SIZE) { 217 size_t fsize = (size_t)fs->st_size; 218 p = mmap(NULL, fsize, PROT_READ, MAP_FILE|MAP_SHARED, 219 from_fd, (off_t)0); 220 if (p != MAP_FAILED) { 221 size_t remainder; 222 223 use_read = false; 224 225 (void) madvise(p, (size_t)fs->st_size, 226 MADV_SEQUENTIAL); 227 228 /* 229 * Write out the data in small chunks to 230 * avoid locking the output file for a 231 * long time if the reading the data from 232 * the source is slow. 233 */ 234 remainder = fsize; 235 do { 236 ssize_t chunk; 237 238 chunk = (remainder > MMAP_MAX_WRITE) ? 239 MMAP_MAX_WRITE : remainder; 240 if (write(to_fd, &p[fsize - remainder], 241 chunk) != chunk) { 242 warn("%s", to.p_path); 243 rval = 1; 244 break; 245 } 246 remainder -= chunk; 247 ptotal += chunk; 248 if (pinfo) 249 progress(&fi, ptotal); 250 } while (remainder > 0); 251 252 if (munmap(p, fsize) < 0) { 253 warn("%s", entp->fts_path); 254 rval = 1; 255 } 256 } 257 } 258 259 if (use_read) { 260 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 261 wcount = write(to_fd, buf, (size_t)rcount); 262 if (rcount != wcount || wcount == -1) { 263 warn("%s", to.p_path); 264 rval = 1; 265 break; 266 } 267 ptotal += wcount; 268 if (pinfo) 269 progress(&fi, ptotal); 270 } 271 if (rcount < 0) { 272 warn("%s", entp->fts_path); 273 rval = 1; 274 } 275 } 276 } 277 278 #ifndef ANDROID 279 if (pflag && (fcpxattr(from_fd, to_fd) != 0)) 280 warn("%s: error copying extended attributes", to.p_path); 281 #endif 282 283 (void)close(from_fd); 284 285 if (rval == 1) { 286 (void)close(to_fd); 287 return (1); 288 } 289 290 if (pflag && setfile(fs, to_fd)) 291 rval = 1; 292 /* 293 * If the source was setuid or setgid, lose the bits unless the 294 * copy is owned by the same user and group. 295 */ 296 #define RETAINBITS \ 297 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 298 if (!pflag && dne 299 && fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) { 300 if (fstat(to_fd, &to_stat)) { 301 warn("%s", to.p_path); 302 rval = 1; 303 } else if (fs->st_gid == to_stat.st_gid && 304 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) { 305 warn("%s", to.p_path); 306 rval = 1; 307 } 308 } 309 if (close(to_fd)) { 310 warn("%s", to.p_path); 311 rval = 1; 312 } 313 /* set the mod/access times now after close of the fd */ 314 if (pflag && set_utimes(to.p_path, fs)) { 315 rval = 1; 316 } 317 return (rval); 318 } 319 320 int 321 copy_link(FTSENT *p, int exists) 322 { 323 int len; 324 char target[MAXPATHLEN]; 325 326 if ((len = readlink(p->fts_path, target, sizeof(target)-1)) == -1) { 327 warn("readlink: %s", p->fts_path); 328 return (1); 329 } 330 target[len] = '\0'; 331 if (exists && unlink(to.p_path)) { 332 warn("unlink: %s", to.p_path); 333 return (1); 334 } 335 if (symlink(target, to.p_path)) { 336 warn("symlink: %s", target); 337 return (1); 338 } 339 return (pflag ? setfile(p->fts_statp, 0) : 0); 340 } 341 342 int 343 copy_fifo(struct stat *from_stat, int exists) 344 { 345 if (exists && unlink(to.p_path)) { 346 warn("unlink: %s", to.p_path); 347 return (1); 348 } 349 if (mkfifo(to.p_path, from_stat->st_mode)) { 350 warn("mkfifo: %s", to.p_path); 351 return (1); 352 } 353 return (pflag ? setfile(from_stat, 0) : 0); 354 } 355 356 int 357 copy_special(struct stat *from_stat, int exists) 358 { 359 if (exists && unlink(to.p_path)) { 360 warn("unlink: %s", to.p_path); 361 return (1); 362 } 363 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 364 warn("mknod: %s", to.p_path); 365 return (1); 366 } 367 return (pflag ? setfile(from_stat, 0) : 0); 368 } 369 370 371 /* 372 * Function: setfile 373 * 374 * Purpose: 375 * Set the owner/group/permissions for the "to" file to the information 376 * in the stat structure. If fd is zero, also call set_utimes() to set 377 * the mod/access times. If fd is non-zero, the caller must do a utimes 378 * itself after close(fd). 379 */ 380 int 381 setfile(struct stat *fs, int fd) 382 { 383 int rval, islink; 384 385 rval = 0; 386 islink = S_ISLNK(fs->st_mode); 387 fs->st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO; 388 389 /* 390 * Changing the ownership probably won't succeed, unless we're root 391 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 392 * the mode; current BSD behavior is to remove all setuid bits on 393 * chown. If chown fails, lose setuid/setgid bits. 394 */ 395 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 396 lchown(to.p_path, fs->st_uid, fs->st_gid)) { 397 if (errno != EPERM) { 398 warn("chown: %s", to.p_path); 399 rval = 1; 400 } 401 fs->st_mode &= ~(S_ISUID | S_ISGID); 402 } 403 #ifdef ANDROID 404 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) { 405 #else 406 if (fd ? fchmod(fd, fs->st_mode) : lchmod(to.p_path, fs->st_mode)) { 407 #endif 408 warn("chmod: %s", to.p_path); 409 rval = 1; 410 } 411 412 #ifndef ANDROID 413 if (!islink && !Nflag) { 414 unsigned long fflags = fs->st_flags; 415 /* 416 * XXX 417 * NFS doesn't support chflags; ignore errors unless 418 * there's reason to believe we're losing bits. 419 * (Note, this still won't be right if the server 420 * supports flags and we were trying to *remove* flags 421 * on a file that we copied, i.e., that we didn't create.) 422 */ 423 errno = 0; 424 if ((fd ? fchflags(fd, fflags) : 425 chflags(to.p_path, fflags)) == -1) 426 if (errno != EOPNOTSUPP || fs->st_flags != 0) { 427 warn("chflags: %s", to.p_path); 428 rval = 1; 429 } 430 } 431 #endif 432 /* if fd is non-zero, caller must call set_utimes() after close() */ 433 if (fd == 0 && set_utimes(to.p_path, fs)) 434 rval = 1; 435 return (rval); 436 } 437 438 void 439 cp_usage(void) 440 { 441 (void)fprintf(stderr, 442 "usage: cp [-R [-H | -L | -P]] [-f | -i] [-alNpv] src target\n" 443 " cp [-R [-H | -L | -P]] [-f | -i] [-alNpv] src1 ... srcN directory\n"); 444 exit(1); 445 /* NOTREACHED */ 446 } 447
