1 /* $NetBSD: utils.c,v 1.39 2011/02/06 12:37:49 darcy 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 1.39 2011/02/06 12:37:49 darcy 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 46 #include <err.h> 47 #include <errno.h> 48 #include <fcntl.h> 49 #include <fts.h> 50 #include <stdbool.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <unistd.h> 55 56 #include "extern.h" 57 58 #define MMAP_MAX_SIZE (8 * 1048576) 59 #define MMAP_MAX_WRITE (64 * 1024) 60 61 int 62 set_utimes(const char *file, struct stat *fs) 63 { 64 static struct timeval tv[2]; 65 66 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 67 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 68 69 if (lutimes(file, tv)) { 70 warn("lutimes: %s", file); 71 return (1); 72 } 73 return (0); 74 } 75 76 int 77 copy_file(FTSENT *entp, int dne) 78 { 79 static char buf[MAXBSIZE]; 80 struct stat to_stat, *fs; 81 int ch, checkch, from_fd, rcount, rval, to_fd, tolnk, wcount; 82 char *p; 83 84 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 85 warn("%s", entp->fts_path); 86 return (1); 87 } 88 89 to_fd = -1; 90 fs = entp->fts_statp; 91 tolnk = ((Rflag && !(Lflag || Hflag)) || Pflag); 92 93 /* 94 * If the file exists and we're interactive, verify with the user. 95 * If the file DNE, set the mode to be the from file, minus setuid 96 * bits, modified by the umask; arguably wrong, but it makes copying 97 * executables work right and it's been that way forever. (The 98 * other choice is 666 or'ed with the execute bits on the from file 99 * modified by the umask.) 100 */ 101 if (!dne) { 102 struct stat sb; 103 int sval; 104 105 if (iflag) { 106 (void)fprintf(stderr, "overwrite %s? ", to.p_path); 107 checkch = ch = getchar(); 108 while (ch != '\n' && ch != EOF) 109 ch = getchar(); 110 if (checkch != 'y' && checkch != 'Y') { 111 (void)close(from_fd); 112 return (0); 113 } 114 } 115 116 sval = tolnk ? 117 lstat(to.p_path, &sb) : stat(to.p_path, &sb); 118 if (sval == -1) { 119 warn("stat: %s", to.p_path); 120 (void)close(from_fd); 121 return (1); 122 } 123 124 if (!(tolnk && S_ISLNK(sb.st_mode))) 125 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 126 } else 127 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 128 fs->st_mode & ~(S_ISUID | S_ISGID)); 129 130 if (to_fd == -1 && (fflag || tolnk)) { 131 /* 132 * attempt to remove existing destination file name and 133 * create a new file 134 */ 135 (void)unlink(to.p_path); 136 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 137 fs->st_mode & ~(S_ISUID | S_ISGID)); 138 } 139 140 if (to_fd == -1) { 141 warn("%s", to.p_path); 142 (void)close(from_fd); 143 return (1); 144 } 145 146 rval = 0; 147 148 /* if hard linking then simply close the open fds, link and return */ 149 if (lflag) { 150 (void)close(from_fd); 151 (void)close(to_fd); 152 (void)unlink(to.p_path); 153 if (link(entp->fts_path, to.p_path)) { 154 warn("%s", to.p_path); 155 return (1); 156 } 157 return (0); 158 } 159 /* NOTREACHED */ 160 161 /* 162 * There's no reason to do anything other than close the file 163 * now if it's empty, so let's not bother. 164 */ 165 if (fs->st_size > 0) { 166 /* 167 * Mmap and write if less than 8M (the limit is so 168 * we don't totally trash memory on big files). 169 * This is really a minor hack, but it wins some CPU back. 170 */ 171 bool use_read; 172 173 use_read = true; 174 if (fs->st_size <= MMAP_MAX_SIZE) { 175 size_t fsize = (size_t)fs->st_size; 176 p = mmap(NULL, fsize, PROT_READ, MAP_FILE|MAP_SHARED, 177 from_fd, (off_t)0); 178 if (p != MAP_FAILED) { 179 size_t remainder; 180 181 use_read = false; 182 183 (void) madvise(p, (size_t)fs->st_size, 184 MADV_SEQUENTIAL); 185 186 /* 187 * Write out the data in small chunks to 188 * avoid locking the output file for a 189 * long time if the reading the data from 190 * the source is slow. 191 */ 192 remainder = fsize; 193 do { 194 ssize_t chunk; 195 196 chunk = (remainder > MMAP_MAX_WRITE) ? 197 MMAP_MAX_WRITE : remainder; 198 if (write(to_fd, &p[fsize - remainder], 199 chunk) != chunk) { 200 warn("%s", to.p_path); 201 rval = 1; 202 break; 203 } 204 remainder -= chunk; 205 } while (remainder > 0); 206 207 if (munmap(p, fsize) < 0) { 208 warn("%s", entp->fts_path); 209 rval = 1; 210 } 211 } 212 } 213 214 if (use_read) { 215 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 216 wcount = write(to_fd, buf, (size_t)rcount); 217 if (rcount != wcount || wcount == -1) { 218 warn("%s", to.p_path); 219 rval = 1; 220 break; 221 } 222 } 223 if (rcount < 0) { 224 warn("%s", entp->fts_path); 225 rval = 1; 226 } 227 } 228 } 229 230 (void)close(from_fd); 231 232 if (rval == 1) { 233 (void)close(to_fd); 234 return (1); 235 } 236 237 if (pflag && setfile(fs, to_fd)) 238 rval = 1; 239 /* 240 * If the source was setuid or setgid, lose the bits unless the 241 * copy is owned by the same user and group. 242 */ 243 #define RETAINBITS \ 244 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 245 if (!pflag && dne 246 && fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) { 247 if (fstat(to_fd, &to_stat)) { 248 warn("%s", to.p_path); 249 rval = 1; 250 } else if (fs->st_gid == to_stat.st_gid && 251 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) { 252 warn("%s", to.p_path); 253 rval = 1; 254 } 255 } 256 if (close(to_fd)) { 257 warn("%s", to.p_path); 258 rval = 1; 259 } 260 /* set the mod/access times now after close of the fd */ 261 if (pflag && set_utimes(to.p_path, fs)) { 262 rval = 1; 263 } 264 return (rval); 265 } 266 267 int 268 copy_link(FTSENT *p, int exists) 269 { 270 int len; 271 char target[MAXPATHLEN]; 272 273 if ((len = readlink(p->fts_path, target, sizeof(target)-1)) == -1) { 274 warn("readlink: %s", p->fts_path); 275 return (1); 276 } 277 target[len] = '\0'; 278 if (exists && unlink(to.p_path)) { 279 warn("unlink: %s", to.p_path); 280 return (1); 281 } 282 if (symlink(target, to.p_path)) { 283 warn("symlink: %s", target); 284 return (1); 285 } 286 return (pflag ? setfile(p->fts_statp, 0) : 0); 287 } 288 289 int 290 copy_fifo(struct stat *from_stat, int exists) 291 { 292 if (exists && unlink(to.p_path)) { 293 warn("unlink: %s", to.p_path); 294 return (1); 295 } 296 if (mkfifo(to.p_path, from_stat->st_mode)) { 297 warn("mkfifo: %s", to.p_path); 298 return (1); 299 } 300 return (pflag ? setfile(from_stat, 0) : 0); 301 } 302 303 int 304 copy_special(struct stat *from_stat, int exists) 305 { 306 if (exists && unlink(to.p_path)) { 307 warn("unlink: %s", to.p_path); 308 return (1); 309 } 310 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 311 warn("mknod: %s", to.p_path); 312 return (1); 313 } 314 return (pflag ? setfile(from_stat, 0) : 0); 315 } 316 317 318 /* 319 * Function: setfile 320 * 321 * Purpose: 322 * Set the owner/group/permissions for the "to" file to the information 323 * in the stat structure. If fd is zero, also call set_utimes() to set 324 * the mod/access times. If fd is non-zero, the caller must do a utimes 325 * itself after close(fd). 326 */ 327 int 328 setfile(struct stat *fs, int fd) 329 { 330 int rval, islink; 331 332 rval = 0; 333 islink = S_ISLNK(fs->st_mode); 334 fs->st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO; 335 336 /* 337 * Changing the ownership probably won't succeed, unless we're root 338 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 339 * the mode; current BSD behavior is to remove all setuid bits on 340 * chown. If chown fails, lose setuid/setgid bits. 341 */ 342 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 343 lchown(to.p_path, fs->st_uid, fs->st_gid)) { 344 if (errno != EPERM) { 345 warn("chown: %s", to.p_path); 346 rval = 1; 347 } 348 fs->st_mode &= ~(S_ISUID | S_ISGID); 349 } 350 if (fd ? fchmod(fd, fs->st_mode) : lchmod(to.p_path, fs->st_mode)) { 351 warn("chmod: %s", to.p_path); 352 rval = 1; 353 } 354 355 if (!islink && !Nflag) { 356 unsigned long fflags = fs->st_flags; 357 /* 358 * XXX 359 * NFS doesn't support chflags; ignore errors unless 360 * there's reason to believe we're losing bits. 361 * (Note, this still won't be right if the server 362 * supports flags and we were trying to *remove* flags 363 * on a file that we copied, i.e., that we didn't create.) 364 */ 365 errno = 0; 366 if ((fd ? fchflags(fd, fflags) : 367 chflags(to.p_path, fflags)) == -1) 368 if (errno != EOPNOTSUPP || fs->st_flags != 0) { 369 warn("chflags: %s", to.p_path); 370 rval = 1; 371 } 372 } 373 /* if fd is non-zero, caller must call set_utimes() after close() */ 374 if (fd == 0 && set_utimes(to.p_path, fs)) 375 rval = 1; 376 return (rval); 377 } 378 379 void 380 usage(void) 381 { 382 (void)fprintf(stderr, 383 "usage: %s [-R [-H | -L | -P]] [-f | -i] [-alNpv] src target\n" 384 " %s [-R [-H | -L | -P]] [-f | -i] [-alNpv] src1 ... srcN directory\n", 385 getprogname(), getprogname()); 386 exit(1); 387 /* NOTREACHED */ 388 } 389