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