1 /* $NetBSD: utils.c,v 1.40 2011/08/03 04:11:15 manu 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 1.40 2011/08/03 04:11:15 manu 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 int 78 copy_file(FTSENT *entp, int dne) 79 { 80 static char buf[MAXBSIZE]; 81 struct stat to_stat, *fs; 82 int ch, checkch, from_fd, rcount, rval, to_fd, tolnk, wcount; 83 char *p; 84 85 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 86 warn("%s", entp->fts_path); 87 return (1); 88 } 89 90 to_fd = -1; 91 fs = entp->fts_statp; 92 tolnk = ((Rflag && !(Lflag || Hflag)) || Pflag); 93 94 /* 95 * If the file exists and we're interactive, verify with the user. 96 * If the file DNE, set the mode to be the from file, minus setuid 97 * bits, modified by the umask; arguably wrong, but it makes copying 98 * executables work right and it's been that way forever. (The 99 * other choice is 666 or'ed with the execute bits on the from file 100 * modified by the umask.) 101 */ 102 if (!dne) { 103 struct stat sb; 104 int sval; 105 106 if (iflag) { 107 (void)fprintf(stderr, "overwrite %s? ", to.p_path); 108 checkch = ch = getchar(); 109 while (ch != '\n' && ch != EOF) 110 ch = getchar(); 111 if (checkch != 'y' && checkch != 'Y') { 112 (void)close(from_fd); 113 return (0); 114 } 115 } 116 117 sval = tolnk ? 118 lstat(to.p_path, &sb) : stat(to.p_path, &sb); 119 if (sval == -1) { 120 warn("stat: %s", to.p_path); 121 (void)close(from_fd); 122 return (1); 123 } 124 125 if (!(tolnk && S_ISLNK(sb.st_mode))) 126 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 127 } else 128 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 129 fs->st_mode & ~(S_ISUID | S_ISGID)); 130 131 if (to_fd == -1 && (fflag || tolnk)) { 132 /* 133 * attempt to remove existing destination file name and 134 * create a new file 135 */ 136 (void)unlink(to.p_path); 137 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 138 fs->st_mode & ~(S_ISUID | S_ISGID)); 139 } 140 141 if (to_fd == -1) { 142 warn("%s", to.p_path); 143 (void)close(from_fd); 144 return (1); 145 } 146 147 rval = 0; 148 149 /* if hard linking then simply close the open fds, link and return */ 150 if (lflag) { 151 (void)close(from_fd); 152 (void)close(to_fd); 153 (void)unlink(to.p_path); 154 if (link(entp->fts_path, to.p_path)) { 155 warn("%s", to.p_path); 156 return (1); 157 } 158 return (0); 159 } 160 /* NOTREACHED */ 161 162 /* 163 * There's no reason to do anything other than close the file 164 * now if it's empty, so let's not bother. 165 */ 166 if (fs->st_size > 0) { 167 /* 168 * Mmap and write if less than 8M (the limit is so 169 * we don't totally trash memory on big files). 170 * This is really a minor hack, but it wins some CPU back. 171 */ 172 bool use_read; 173 174 use_read = true; 175 if (fs->st_size <= MMAP_MAX_SIZE) { 176 size_t fsize = (size_t)fs->st_size; 177 p = mmap(NULL, fsize, PROT_READ, MAP_FILE|MAP_SHARED, 178 from_fd, (off_t)0); 179 if (p != MAP_FAILED) { 180 size_t remainder; 181 182 use_read = false; 183 184 (void) madvise(p, (size_t)fs->st_size, 185 MADV_SEQUENTIAL); 186 187 /* 188 * Write out the data in small chunks to 189 * avoid locking the output file for a 190 * long time if the reading the data from 191 * the source is slow. 192 */ 193 remainder = fsize; 194 do { 195 ssize_t chunk; 196 197 chunk = (remainder > MMAP_MAX_WRITE) ? 198 MMAP_MAX_WRITE : remainder; 199 if (write(to_fd, &p[fsize - remainder], 200 chunk) != chunk) { 201 warn("%s", to.p_path); 202 rval = 1; 203 break; 204 } 205 remainder -= chunk; 206 } while (remainder > 0); 207 208 if (munmap(p, fsize) < 0) { 209 warn("%s", entp->fts_path); 210 rval = 1; 211 } 212 } 213 } 214 215 if (use_read) { 216 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 217 wcount = write(to_fd, buf, (size_t)rcount); 218 if (rcount != wcount || wcount == -1) { 219 warn("%s", to.p_path); 220 rval = 1; 221 break; 222 } 223 } 224 if (rcount < 0) { 225 warn("%s", entp->fts_path); 226 rval = 1; 227 } 228 } 229 } 230 231 if (pflag && (fcpxattr(from_fd, to_fd) != 0)) 232 warn("%s: error copying extended attributes", to.p_path); 233 234 (void)close(from_fd); 235 236 if (rval == 1) { 237 (void)close(to_fd); 238 return (1); 239 } 240 241 if (pflag && setfile(fs, to_fd)) 242 rval = 1; 243 /* 244 * If the source was setuid or setgid, lose the bits unless the 245 * copy is owned by the same user and group. 246 */ 247 #define RETAINBITS \ 248 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 249 if (!pflag && dne 250 && fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) { 251 if (fstat(to_fd, &to_stat)) { 252 warn("%s", to.p_path); 253 rval = 1; 254 } else if (fs->st_gid == to_stat.st_gid && 255 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) { 256 warn("%s", to.p_path); 257 rval = 1; 258 } 259 } 260 if (close(to_fd)) { 261 warn("%s", to.p_path); 262 rval = 1; 263 } 264 /* set the mod/access times now after close of the fd */ 265 if (pflag && set_utimes(to.p_path, fs)) { 266 rval = 1; 267 } 268 return (rval); 269 } 270 271 int 272 copy_link(FTSENT *p, int exists) 273 { 274 int len; 275 char target[MAXPATHLEN]; 276 277 if ((len = readlink(p->fts_path, target, sizeof(target)-1)) == -1) { 278 warn("readlink: %s", p->fts_path); 279 return (1); 280 } 281 target[len] = '\0'; 282 if (exists && unlink(to.p_path)) { 283 warn("unlink: %s", to.p_path); 284 return (1); 285 } 286 if (symlink(target, to.p_path)) { 287 warn("symlink: %s", target); 288 return (1); 289 } 290 return (pflag ? setfile(p->fts_statp, 0) : 0); 291 } 292 293 int 294 copy_fifo(struct stat *from_stat, int exists) 295 { 296 if (exists && unlink(to.p_path)) { 297 warn("unlink: %s", to.p_path); 298 return (1); 299 } 300 if (mkfifo(to.p_path, from_stat->st_mode)) { 301 warn("mkfifo: %s", to.p_path); 302 return (1); 303 } 304 return (pflag ? setfile(from_stat, 0) : 0); 305 } 306 307 int 308 copy_special(struct stat *from_stat, int exists) 309 { 310 if (exists && unlink(to.p_path)) { 311 warn("unlink: %s", to.p_path); 312 return (1); 313 } 314 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 315 warn("mknod: %s", to.p_path); 316 return (1); 317 } 318 return (pflag ? setfile(from_stat, 0) : 0); 319 } 320 321 322 /* 323 * Function: setfile 324 * 325 * Purpose: 326 * Set the owner/group/permissions for the "to" file to the information 327 * in the stat structure. If fd is zero, also call set_utimes() to set 328 * the mod/access times. If fd is non-zero, the caller must do a utimes 329 * itself after close(fd). 330 */ 331 int 332 setfile(struct stat *fs, int fd) 333 { 334 int rval, islink; 335 336 rval = 0; 337 islink = S_ISLNK(fs->st_mode); 338 fs->st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO; 339 340 /* 341 * Changing the ownership probably won't succeed, unless we're root 342 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 343 * the mode; current BSD behavior is to remove all setuid bits on 344 * chown. If chown fails, lose setuid/setgid bits. 345 */ 346 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 347 lchown(to.p_path, fs->st_uid, fs->st_gid)) { 348 if (errno != EPERM) { 349 warn("chown: %s", to.p_path); 350 rval = 1; 351 } 352 fs->st_mode &= ~(S_ISUID | S_ISGID); 353 } 354 if (fd ? fchmod(fd, fs->st_mode) : lchmod(to.p_path, fs->st_mode)) { 355 warn("chmod: %s", to.p_path); 356 rval = 1; 357 } 358 359 if (!islink && !Nflag) { 360 unsigned long fflags = fs->st_flags; 361 /* 362 * XXX 363 * NFS doesn't support chflags; ignore errors unless 364 * there's reason to believe we're losing bits. 365 * (Note, this still won't be right if the server 366 * supports flags and we were trying to *remove* flags 367 * on a file that we copied, i.e., that we didn't create.) 368 */ 369 errno = 0; 370 if ((fd ? fchflags(fd, fflags) : 371 chflags(to.p_path, fflags)) == -1) 372 if (errno != EOPNOTSUPP || fs->st_flags != 0) { 373 warn("chflags: %s", to.p_path); 374 rval = 1; 375 } 376 } 377 /* if fd is non-zero, caller must call set_utimes() after close() */ 378 if (fd == 0 && set_utimes(to.p_path, fs)) 379 rval = 1; 380 return (rval); 381 } 382 383 void 384 usage(void) 385 { 386 (void)fprintf(stderr, 387 "usage: %s [-R [-H | -L | -P]] [-f | -i] [-alNpv] src target\n" 388 " %s [-R [-H | -L | -P]] [-f | -i] [-alNpv] src1 ... srcN directory\n", 389 getprogname(), getprogname()); 390 exit(1); 391 /* NOTREACHED */ 392 } 393