1/* $NetBSD: utils.c,v 1.42 2013/12/11 06:00:11 dholland 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 35static char sccsid[] = "@(#)utils.c 8.3 (Berkeley) 4/1/94"; 36#else 37__RCSID("$NetBSD: utils.c,v 1.42 2013/12/11 06:00:11 dholland 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#include <sys/extattr.h> 46 47#include <err.h> 48#include <errno.h> 49#include <fcntl.h> 50#include <fts.h> 51#include <stdbool.h> 52#include <stdio.h> 53#include <stdlib.h> 54#include <string.h> 55#include <unistd.h> 56 57#include "extern.h" 58 59#define MMAP_MAX_SIZE (8 * 1048576) 60#define MMAP_MAX_WRITE (64 * 1024) 61 62int 63set_utimes(const char *file, struct stat *fs) 64{ 65 static struct timeval tv[2]; 66 67#ifdef __ANDROID__ 68 tv[0].tv_sec = fs->st_atime; 69 tv[0].tv_usec = 0; 70 tv[1].tv_sec = fs->st_mtime; 71 tv[1].tv_usec = 0; 72 73 if (utimes(file, tv)) { 74 warn("utimes: %s", file); 75 return 1; 76 } 77#else 78 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 79 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 80 81 if (lutimes(file, tv)) { 82 warn("lutimes: %s", file); 83 return (1); 84 } 85#endif 86 return (0); 87} 88 89struct finfo { 90 const char *from; 91 const char *to; 92 size_t size; 93}; 94 95static void 96progress(const struct finfo *fi, size_t written) 97{ 98 int pcent = (int)((100.0 * written) / fi->size); 99 100 pinfo = 0; 101 (void)fprintf(stderr, "%s => %s %zu/%zu bytes %d%% written\n", 102 fi->from, fi->to, written, fi->size, pcent); 103} 104 105int 106copy_file(FTSENT *entp, int dne) 107{ 108 static char buf[MAXBSIZE]; 109 struct stat to_stat, *fs; 110 int ch, checkch, from_fd, rcount, rval, to_fd, tolnk, wcount; 111 char *p; 112 size_t ptotal = 0; 113 114 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 115 warn("%s", entp->fts_path); 116 return (1); 117 } 118 119 to_fd = -1; 120 fs = entp->fts_statp; 121 tolnk = ((Rflag && !(Lflag || Hflag)) || Pflag); 122 123 /* 124 * If the file exists and we're interactive, verify with the user. 125 * If the file DNE, set the mode to be the from file, minus setuid 126 * bits, modified by the umask; arguably wrong, but it makes copying 127 * executables work right and it's been that way forever. (The 128 * other choice is 666 or'ed with the execute bits on the from file 129 * modified by the umask.) 130 */ 131 if (!dne) { 132 struct stat sb; 133 int sval; 134 135 if (iflag) { 136 (void)fprintf(stderr, "overwrite %s? ", to.p_path); 137 checkch = ch = getchar(); 138 while (ch != '\n' && ch != EOF) 139 ch = getchar(); 140 if (checkch != 'y' && checkch != 'Y') { 141 (void)close(from_fd); 142 return (0); 143 } 144 } 145 146 sval = tolnk ? 147 lstat(to.p_path, &sb) : stat(to.p_path, &sb); 148 if (sval == -1) { 149 warn("stat: %s", to.p_path); 150 (void)close(from_fd); 151 return (1); 152 } 153 154 if (!(tolnk && S_ISLNK(sb.st_mode))) 155 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 156 } else 157 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 158 fs->st_mode & ~(S_ISUID | S_ISGID)); 159 160 if (to_fd == -1 && (fflag || tolnk)) { 161 /* 162 * attempt to remove existing destination file name and 163 * create a new file 164 */ 165 (void)unlink(to.p_path); 166 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 167 fs->st_mode & ~(S_ISUID | S_ISGID)); 168 } 169 170 if (to_fd == -1) { 171 warn("%s", to.p_path); 172 (void)close(from_fd); 173 return (1); 174 } 175 176 rval = 0; 177 178 /* if hard linking then simply close the open fds, link and return */ 179 if (lflag) { 180 (void)close(from_fd); 181 (void)close(to_fd); 182 (void)unlink(to.p_path); 183 if (link(entp->fts_path, to.p_path)) { 184 warn("%s", to.p_path); 185 return (1); 186 } 187 return (0); 188 } 189 190 /* 191 * There's no reason to do anything other than close the file 192 * now if it's empty, so let's not bother. 193 */ 194#ifndef __ANDROID__ // Files in /proc report length 0. mmap will fail but we'll fall back to read. 195 if (fs->st_size > 0) { 196#endif 197 struct finfo fi; 198 199 fi.from = entp->fts_path; 200 fi.to = to.p_path; 201 fi.size = (size_t)fs->st_size; 202 203 /* 204 * Mmap and write if less than 8M (the limit is so 205 * we don't totally trash memory on big files). 206 * This is really a minor hack, but it wins some CPU back. 207 */ 208 bool use_read; 209 210 use_read = true; 211 if (fs->st_size <= MMAP_MAX_SIZE) { 212 size_t fsize = (size_t)fs->st_size; 213 p = mmap(NULL, fsize, PROT_READ, MAP_FILE|MAP_SHARED, 214 from_fd, (off_t)0); 215 if (p != MAP_FAILED) { 216 size_t remainder; 217 218 use_read = false; 219 220 (void) madvise(p, (size_t)fs->st_size, 221 MADV_SEQUENTIAL); 222 223 /* 224 * Write out the data in small chunks to 225 * avoid locking the output file for a 226 * long time if the reading the data from 227 * the source is slow. 228 */ 229 remainder = fsize; 230 do { 231 ssize_t chunk; 232 233 chunk = (remainder > MMAP_MAX_WRITE) ? 234 MMAP_MAX_WRITE : remainder; 235 if (write(to_fd, &p[fsize - remainder], 236 chunk) != chunk) { 237 warn("%s", to.p_path); 238 rval = 1; 239 break; 240 } 241 remainder -= chunk; 242 ptotal += chunk; 243 if (pinfo) 244 progress(&fi, ptotal); 245 } while (remainder > 0); 246 247 if (munmap(p, fsize) < 0) { 248 warn("%s", entp->fts_path); 249 rval = 1; 250 } 251 } 252 } 253 254 if (use_read) { 255 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 256 wcount = write(to_fd, buf, (size_t)rcount); 257 if (rcount != wcount || wcount == -1) { 258 warn("%s", to.p_path); 259 rval = 1; 260 break; 261 } 262 ptotal += wcount; 263 if (pinfo) 264 progress(&fi, ptotal); 265 } 266 if (rcount < 0) { 267 warn("%s", entp->fts_path); 268 rval = 1; 269 } 270 } 271#ifndef __ANDROID__ 272 } 273#endif 274 275#ifndef __ANDROID__ 276 if (pflag && (fcpxattr(from_fd, to_fd) != 0)) 277 warn("%s: error copying extended attributes", to.p_path); 278#endif 279 280 (void)close(from_fd); 281 282 if (rval == 1) { 283 (void)close(to_fd); 284 return (1); 285 } 286 287 if (pflag && setfile(fs, to_fd)) 288 rval = 1; 289 /* 290 * If the source was setuid or setgid, lose the bits unless the 291 * copy is owned by the same user and group. 292 */ 293#define RETAINBITS \ 294 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 295 if (!pflag && dne 296 && fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) { 297 if (fstat(to_fd, &to_stat)) { 298 warn("%s", to.p_path); 299 rval = 1; 300 } else if (fs->st_gid == to_stat.st_gid && 301 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) { 302 warn("%s", to.p_path); 303 rval = 1; 304 } 305 } 306 if (close(to_fd)) { 307 warn("%s", to.p_path); 308 rval = 1; 309 } 310 /* set the mod/access times now after close of the fd */ 311 if (pflag && set_utimes(to.p_path, fs)) { 312 rval = 1; 313 } 314 return (rval); 315} 316 317int 318copy_link(FTSENT *p, int exists) 319{ 320 int len; 321 char target[MAXPATHLEN]; 322 323 if ((len = readlink(p->fts_path, target, sizeof(target)-1)) == -1) { 324 warn("readlink: %s", p->fts_path); 325 return (1); 326 } 327 target[len] = '\0'; 328 if (exists && unlink(to.p_path)) { 329 warn("unlink: %s", to.p_path); 330 return (1); 331 } 332 if (symlink(target, to.p_path)) { 333 warn("symlink: %s", target); 334 return (1); 335 } 336 return (pflag ? setfile(p->fts_statp, 0) : 0); 337} 338 339int 340copy_fifo(struct stat *from_stat, int exists) 341{ 342 if (exists && unlink(to.p_path)) { 343 warn("unlink: %s", to.p_path); 344 return (1); 345 } 346 if (mkfifo(to.p_path, from_stat->st_mode)) { 347 warn("mkfifo: %s", to.p_path); 348 return (1); 349 } 350 return (pflag ? setfile(from_stat, 0) : 0); 351} 352 353int 354copy_special(struct stat *from_stat, int exists) 355{ 356 if (exists && unlink(to.p_path)) { 357 warn("unlink: %s", to.p_path); 358 return (1); 359 } 360 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 361 warn("mknod: %s", to.p_path); 362 return (1); 363 } 364 return (pflag ? setfile(from_stat, 0) : 0); 365} 366 367 368/* 369 * Function: setfile 370 * 371 * Purpose: 372 * Set the owner/group/permissions for the "to" file to the information 373 * in the stat structure. If fd is zero, also call set_utimes() to set 374 * the mod/access times. If fd is non-zero, the caller must do a utimes 375 * itself after close(fd). 376 */ 377int 378setfile(struct stat *fs, int fd) 379{ 380 int rval, islink; 381 382 rval = 0; 383 islink = S_ISLNK(fs->st_mode); 384 fs->st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO; 385 386 /* 387 * Changing the ownership probably won't succeed, unless we're root 388 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 389 * the mode; current BSD behavior is to remove all setuid bits on 390 * chown. If chown fails, lose setuid/setgid bits. 391 */ 392 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 393 lchown(to.p_path, fs->st_uid, fs->st_gid)) { 394 if (errno != EPERM) { 395 warn("chown: %s", to.p_path); 396 rval = 1; 397 } 398 fs->st_mode &= ~(S_ISUID | S_ISGID); 399 } 400#ifdef __ANDROID__ 401 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) { 402#else 403 if (fd ? fchmod(fd, fs->st_mode) : lchmod(to.p_path, fs->st_mode)) { 404#endif 405 warn("chmod: %s", to.p_path); 406 rval = 1; 407 } 408 409#ifndef __ANDROID__ 410 if (!islink && !Nflag) { 411 unsigned long fflags = fs->st_flags; 412 /* 413 * XXX 414 * NFS doesn't support chflags; ignore errors unless 415 * there's reason to believe we're losing bits. 416 * (Note, this still won't be right if the server 417 * supports flags and we were trying to *remove* flags 418 * on a file that we copied, i.e., that we didn't create.) 419 */ 420 errno = 0; 421 if ((fd ? fchflags(fd, fflags) : 422 chflags(to.p_path, fflags)) == -1) 423 if (errno != EOPNOTSUPP || fs->st_flags != 0) { 424 warn("chflags: %s", to.p_path); 425 rval = 1; 426 } 427 } 428#endif 429 /* if fd is non-zero, caller must call set_utimes() after close() */ 430 if (fd == 0 && set_utimes(to.p_path, fs)) 431 rval = 1; 432 return (rval); 433} 434 435void 436usage(void) 437{ 438 (void)fprintf(stderr, 439 "usage: %s [-R [-H | -L | -P]] [-f | -i] [-alNpv] src target\n" 440 " %s [-R [-H | -L | -P]] [-f | -i] [-alNpv] src1 ... srcN directory\n", 441 getprogname(), getprogname()); 442 exit(1); 443 /* NOTREACHED */ 444} 445