1 /* $NetBSD: utils.c,v 1.46 2018/07/17 13:04:58 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 1.46 2018/07/17 13:04:58 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 #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 struct timespec ts[2]; 66 67 ts[0] = fs->st_atimespec; 68 ts[1] = fs->st_mtimespec; 69 70 if (lutimens(file, ts)) { 71 warn("lutimens: %s", file); 72 return (1); 73 } 74 return (0); 75 } 76 77 struct finfo { 78 const char *from; 79 const char *to; 80 off_t size; 81 }; 82 83 static void 84 progress(const struct finfo *fi, off_t written) 85 { 86 int pcent = (int)((100.0 * written) / fi->size); 87 88 pinfo = 0; 89 (void)fprintf(stderr, "%s => %s %llu/%llu bytes %d%% written\n", 90 fi->from, fi->to, (unsigned long long)written, 91 (unsigned long long)fi->size, pcent); 92 } 93 94 int 95 copy_file(FTSENT *entp, int dne) 96 { 97 static char buf[MAXBSIZE]; 98 struct stat to_stat, *fs; 99 int ch, checkch, from_fd, rcount, rval, to_fd, tolnk, wcount; 100 char *p; 101 off_t ptotal = 0; 102 103 /* if hard linking then simply link and return */ 104 if (lflag) { 105 (void)unlink(to.p_path); 106 if (link(entp->fts_path, to.p_path)) { 107 warn("%s", to.p_path); 108 return (1); 109 } 110 return (0); 111 } 112 113 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 114 warn("%s", entp->fts_path); 115 return (1); 116 } 117 118 to_fd = -1; 119 fs = entp->fts_statp; 120 tolnk = ((Rflag && !(Lflag || Hflag)) || Pflag); 121 122 /* 123 * If the file exists and we're interactive, verify with the user. 124 * If the file DNE, set the mode to be the from file, minus setuid 125 * bits, modified by the umask; arguably wrong, but it makes copying 126 * executables work right and it's been that way forever. (The 127 * other choice is 666 or'ed with the execute bits on the from file 128 * modified by the umask.) 129 */ 130 if (!dne) { 131 struct stat sb; 132 int sval; 133 134 if (iflag) { 135 (void)fprintf(stderr, "overwrite %s? ", to.p_path); 136 checkch = ch = getchar(); 137 while (ch != '\n' && ch != EOF) 138 ch = getchar(); 139 if (checkch != 'y' && checkch != 'Y') { 140 (void)close(from_fd); 141 return (0); 142 } 143 } 144 145 sval = tolnk ? 146 lstat(to.p_path, &sb) : stat(to.p_path, &sb); 147 if (sval == -1) { 148 warn("stat: %s", to.p_path); 149 (void)close(from_fd); 150 return (1); 151 } 152 153 if (!(tolnk && S_ISLNK(sb.st_mode))) 154 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 155 } else 156 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 157 fs->st_mode & ~(S_ISUID | S_ISGID)); 158 159 if (to_fd == -1 && (fflag || tolnk)) { 160 /* 161 * attempt to remove existing destination file name and 162 * create a new file 163 */ 164 (void)unlink(to.p_path); 165 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 166 fs->st_mode & ~(S_ISUID | S_ISGID)); 167 } 168 169 if (to_fd == -1) { 170 warn("%s", to.p_path); 171 (void)close(from_fd); 172 return (1); 173 } 174 175 rval = 0; 176 177 /* 178 * There's no reason to do anything other than close the file 179 * now if it's empty, so let's not bother. 180 */ 181 if (fs->st_size > 0) { 182 struct finfo fi; 183 184 fi.from = entp->fts_path; 185 fi.to = to.p_path; 186 fi.size = fs->st_size; 187 188 /* 189 * Mmap and write if less than 8M (the limit is so 190 * we don't totally trash memory on big files). 191 * This is really a minor hack, but it wins some CPU back. 192 */ 193 bool use_read; 194 195 use_read = true; 196 if (fs->st_size <= MMAP_MAX_SIZE) { 197 size_t fsize = (size_t)fs->st_size; 198 p = mmap(NULL, fsize, PROT_READ, MAP_FILE|MAP_SHARED, 199 from_fd, (off_t)0); 200 if (p != MAP_FAILED) { 201 size_t remainder; 202 203 use_read = false; 204 205 (void) madvise(p, (size_t)fs->st_size, 206 MADV_SEQUENTIAL); 207 208 /* 209 * Write out the data in small chunks to 210 * avoid locking the output file for a 211 * long time if the reading the data from 212 * the source is slow. 213 */ 214 remainder = fsize; 215 do { 216 ssize_t chunk; 217 218 chunk = (remainder > MMAP_MAX_WRITE) ? 219 MMAP_MAX_WRITE : remainder; 220 if (write(to_fd, &p[fsize - remainder], 221 chunk) != chunk) { 222 warn("%s", to.p_path); 223 rval = 1; 224 break; 225 } 226 remainder -= chunk; 227 ptotal += chunk; 228 if (pinfo) 229 progress(&fi, ptotal); 230 } while (remainder > 0); 231 232 if (munmap(p, fsize) < 0) { 233 warn("%s", entp->fts_path); 234 rval = 1; 235 } 236 } 237 } 238 239 if (use_read) { 240 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 241 wcount = write(to_fd, buf, (size_t)rcount); 242 if (rcount != wcount || wcount == -1) { 243 warn("%s", to.p_path); 244 rval = 1; 245 break; 246 } 247 ptotal += wcount; 248 if (pinfo) 249 progress(&fi, ptotal); 250 } 251 if (rcount < 0) { 252 warn("%s", entp->fts_path); 253 rval = 1; 254 } 255 } 256 } 257 258 if (pflag && (fcpxattr(from_fd, to_fd) != 0)) 259 warn("%s: error copying extended attributes", to.p_path); 260 261 (void)close(from_fd); 262 263 if (rval == 1) { 264 (void)close(to_fd); 265 return (1); 266 } 267 268 if (pflag && setfile(fs, to_fd)) 269 rval = 1; 270 /* 271 * If the source was setuid or setgid, lose the bits unless the 272 * copy is owned by the same user and group. 273 */ 274 #define RETAINBITS \ 275 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 276 if (!pflag && dne 277 && fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) { 278 if (fstat(to_fd, &to_stat)) { 279 warn("%s", to.p_path); 280 rval = 1; 281 } else if (fs->st_gid == to_stat.st_gid && 282 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) { 283 warn("%s", to.p_path); 284 rval = 1; 285 } 286 } 287 if (close(to_fd)) { 288 warn("%s", to.p_path); 289 rval = 1; 290 } 291 /* set the mod/access times now after close of the fd */ 292 if (pflag && set_utimes(to.p_path, fs)) { 293 rval = 1; 294 } 295 return (rval); 296 } 297 298 int 299 copy_link(FTSENT *p, int exists) 300 { 301 int len; 302 char target[MAXPATHLEN]; 303 304 if ((len = readlink(p->fts_path, target, sizeof(target)-1)) == -1) { 305 warn("readlink: %s", p->fts_path); 306 return (1); 307 } 308 target[len] = '\0'; 309 if (exists && unlink(to.p_path)) { 310 warn("unlink: %s", to.p_path); 311 return (1); 312 } 313 if (symlink(target, to.p_path)) { 314 warn("symlink: %s", target); 315 return (1); 316 } 317 return (pflag ? setfile(p->fts_statp, 0) : 0); 318 } 319 320 int 321 copy_fifo(struct stat *from_stat, int exists) 322 { 323 if (exists && unlink(to.p_path)) { 324 warn("unlink: %s", to.p_path); 325 return (1); 326 } 327 if (mkfifo(to.p_path, from_stat->st_mode)) { 328 warn("mkfifo: %s", to.p_path); 329 return (1); 330 } 331 return (pflag ? setfile(from_stat, 0) : 0); 332 } 333 334 int 335 copy_special(struct stat *from_stat, int exists) 336 { 337 if (exists && unlink(to.p_path)) { 338 warn("unlink: %s", to.p_path); 339 return (1); 340 } 341 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 342 warn("mknod: %s", to.p_path); 343 return (1); 344 } 345 return (pflag ? setfile(from_stat, 0) : 0); 346 } 347 348 349 /* 350 * Function: setfile 351 * 352 * Purpose: 353 * Set the owner/group/permissions for the "to" file to the information 354 * in the stat structure. If fd is zero, also call set_utimes() to set 355 * the mod/access times. If fd is non-zero, the caller must do a utimes 356 * itself after close(fd). 357 */ 358 int 359 setfile(struct stat *fs, int fd) 360 { 361 int rval, islink; 362 363 rval = 0; 364 islink = S_ISLNK(fs->st_mode); 365 fs->st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO; 366 367 /* 368 * Changing the ownership probably won't succeed, unless we're root 369 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 370 * the mode; current BSD behavior is to remove all setuid bits on 371 * chown. If chown fails, lose setuid/setgid bits. 372 */ 373 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 374 lchown(to.p_path, fs->st_uid, fs->st_gid)) { 375 if (errno != EPERM) { 376 warn("chown: %s", to.p_path); 377 rval = 1; 378 } 379 fs->st_mode &= ~(S_ISUID | S_ISGID); 380 } 381 if (fd ? fchmod(fd, fs->st_mode) : lchmod(to.p_path, fs->st_mode)) { 382 warn("chmod: %s", to.p_path); 383 rval = 1; 384 } 385 386 if (!islink && !Nflag) { 387 unsigned long fflags = fs->st_flags; 388 /* 389 * XXX 390 * NFS doesn't support chflags; ignore errors unless 391 * there's reason to believe we're losing bits. 392 * (Note, this still won't be right if the server 393 * supports flags and we were trying to *remove* flags 394 * on a file that we copied, i.e., that we didn't create.) 395 */ 396 errno = 0; 397 if ((fd ? fchflags(fd, fflags) : 398 chflags(to.p_path, fflags)) == -1) 399 if (errno != EOPNOTSUPP || fs->st_flags != 0) { 400 warn("chflags: %s", to.p_path); 401 rval = 1; 402 } 403 } 404 /* if fd is non-zero, caller must call set_utimes() after close() */ 405 if (fd == 0 && set_utimes(to.p_path, fs)) 406 rval = 1; 407 return (rval); 408 } 409 410 void 411 usage(void) 412 { 413 (void)fprintf(stderr, 414 "usage: %s [-R [-H | -L | -P]] [-f | -i] [-alNpv] src target\n" 415 " %s [-R [-H | -L | -P]] [-f | -i] [-alNpv] src1 ... srcN directory\n", 416 getprogname(), getprogname()); 417 exit(1); 418 /* NOTREACHED */ 419 } 420