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 35 static 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 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 } 177 178 /* 179 * There's no reason to do anything other than close the file 180 * now if it's empty, so let's not bother. 181 */ 182 if (fs->st_size > 0) { 183 struct finfo fi; 184 185 fi.from = entp->fts_path; 186 fi.to = to.p_path; 187 fi.size = (size_t)fs->st_size; 188 189 /* 190 * Mmap and write if less than 8M (the limit is so 191 * we don't totally trash memory on big files). 192 * This is really a minor hack, but it wins some CPU back. 193 */ 194 bool use_read; 195 196 use_read = true; 197 if (fs->st_size <= MMAP_MAX_SIZE) { 198 size_t fsize = (size_t)fs->st_size; 199 p = mmap(NULL, fsize, PROT_READ, MAP_FILE|MAP_SHARED, 200 from_fd, (off_t)0); 201 if (p != MAP_FAILED) { 202 size_t remainder; 203 204 use_read = false; 205 206 (void) madvise(p, (size_t)fs->st_size, 207 MADV_SEQUENTIAL); 208 209 /* 210 * Write out the data in small chunks to 211 * avoid locking the output file for a 212 * long time if the reading the data from 213 * the source is slow. 214 */ 215 remainder = fsize; 216 do { 217 ssize_t chunk; 218 219 chunk = (remainder > MMAP_MAX_WRITE) ? 220 MMAP_MAX_WRITE : remainder; 221 if (write(to_fd, &p[fsize - remainder], 222 chunk) != chunk) { 223 warn("%s", to.p_path); 224 rval = 1; 225 break; 226 } 227 remainder -= chunk; 228 ptotal += chunk; 229 if (pinfo) 230 progress(&fi, ptotal); 231 } while (remainder > 0); 232 233 if (munmap(p, fsize) < 0) { 234 warn("%s", entp->fts_path); 235 rval = 1; 236 } 237 } 238 } 239 240 if (use_read) { 241 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 242 wcount = write(to_fd, buf, (size_t)rcount); 243 if (rcount != wcount || wcount == -1) { 244 warn("%s", to.p_path); 245 rval = 1; 246 break; 247 } 248 ptotal += wcount; 249 if (pinfo) 250 progress(&fi, ptotal); 251 } 252 if (rcount < 0) { 253 warn("%s", entp->fts_path); 254 rval = 1; 255 } 256 } 257 } 258 259 if (pflag && (fcpxattr(from_fd, to_fd) != 0)) 260 warn("%s: error copying extended attributes", to.p_path); 261 262 (void)close(from_fd); 263 264 if (rval == 1) { 265 (void)close(to_fd); 266 return (1); 267 } 268 269 if (pflag && setfile(fs, to_fd)) 270 rval = 1; 271 /* 272 * If the source was setuid or setgid, lose the bits unless the 273 * copy is owned by the same user and group. 274 */ 275 #define RETAINBITS \ 276 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 277 if (!pflag && dne 278 && fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) { 279 if (fstat(to_fd, &to_stat)) { 280 warn("%s", to.p_path); 281 rval = 1; 282 } else if (fs->st_gid == to_stat.st_gid && 283 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) { 284 warn("%s", to.p_path); 285 rval = 1; 286 } 287 } 288 if (close(to_fd)) { 289 warn("%s", to.p_path); 290 rval = 1; 291 } 292 /* set the mod/access times now after close of the fd */ 293 if (pflag && set_utimes(to.p_path, fs)) { 294 rval = 1; 295 } 296 return (rval); 297 } 298 299 int 300 copy_link(FTSENT *p, int exists) 301 { 302 int len; 303 char target[MAXPATHLEN]; 304 305 if ((len = readlink(p->fts_path, target, sizeof(target)-1)) == -1) { 306 warn("readlink: %s", p->fts_path); 307 return (1); 308 } 309 target[len] = '\0'; 310 if (exists && unlink(to.p_path)) { 311 warn("unlink: %s", to.p_path); 312 return (1); 313 } 314 if (symlink(target, to.p_path)) { 315 warn("symlink: %s", target); 316 return (1); 317 } 318 return (pflag ? setfile(p->fts_statp, 0) : 0); 319 } 320 321 int 322 copy_fifo(struct stat *from_stat, int exists) 323 { 324 if (exists && unlink(to.p_path)) { 325 warn("unlink: %s", to.p_path); 326 return (1); 327 } 328 if (mkfifo(to.p_path, from_stat->st_mode)) { 329 warn("mkfifo: %s", to.p_path); 330 return (1); 331 } 332 return (pflag ? setfile(from_stat, 0) : 0); 333 } 334 335 int 336 copy_special(struct stat *from_stat, int exists) 337 { 338 if (exists && unlink(to.p_path)) { 339 warn("unlink: %s", to.p_path); 340 return (1); 341 } 342 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 343 warn("mknod: %s", to.p_path); 344 return (1); 345 } 346 return (pflag ? setfile(from_stat, 0) : 0); 347 } 348 349 350 /* 351 * Function: setfile 352 * 353 * Purpose: 354 * Set the owner/group/permissions for the "to" file to the information 355 * in the stat structure. If fd is zero, also call set_utimes() to set 356 * the mod/access times. If fd is non-zero, the caller must do a utimes 357 * itself after close(fd). 358 */ 359 int 360 setfile(struct stat *fs, int fd) 361 { 362 int rval, islink; 363 364 rval = 0; 365 islink = S_ISLNK(fs->st_mode); 366 fs->st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO; 367 368 /* 369 * Changing the ownership probably won't succeed, unless we're root 370 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 371 * the mode; current BSD behavior is to remove all setuid bits on 372 * chown. If chown fails, lose setuid/setgid bits. 373 */ 374 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 375 lchown(to.p_path, fs->st_uid, fs->st_gid)) { 376 if (errno != EPERM) { 377 warn("chown: %s", to.p_path); 378 rval = 1; 379 } 380 fs->st_mode &= ~(S_ISUID | S_ISGID); 381 } 382 if (fd ? fchmod(fd, fs->st_mode) : lchmod(to.p_path, fs->st_mode)) { 383 warn("chmod: %s", to.p_path); 384 rval = 1; 385 } 386 387 if (!islink && !Nflag) { 388 unsigned long fflags = fs->st_flags; 389 /* 390 * XXX 391 * NFS doesn't support chflags; ignore errors unless 392 * there's reason to believe we're losing bits. 393 * (Note, this still won't be right if the server 394 * supports flags and we were trying to *remove* flags 395 * on a file that we copied, i.e., that we didn't create.) 396 */ 397 errno = 0; 398 if ((fd ? fchflags(fd, fflags) : 399 chflags(to.p_path, fflags)) == -1) 400 if (errno != EOPNOTSUPP || fs->st_flags != 0) { 401 warn("chflags: %s", to.p_path); 402 rval = 1; 403 } 404 } 405 /* if fd is non-zero, caller must call set_utimes() after close() */ 406 if (fd == 0 && set_utimes(to.p_path, fs)) 407 rval = 1; 408 return (rval); 409 } 410 411 void 412 usage(void) 413 { 414 (void)fprintf(stderr, 415 "usage: %s [-R [-H | -L | -P]] [-f | -i] [-alNpv] src target\n" 416 " %s [-R [-H | -L | -P]] [-f | -i] [-alNpv] src1 ... srcN directory\n", 417 getprogname(), getprogname()); 418 exit(1); 419 /* NOTREACHED */ 420 } 421