1 /* $NetBSD: utils.c,v 1.37 2010/12/21 20:56:01 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 1.37 2010/12/21 20:56:01 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 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 return (1); 121 } 122 123 if (!(tolnk && S_ISLNK(sb.st_mode))) 124 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 125 } else 126 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 127 fs->st_mode & ~(S_ISUID | S_ISGID)); 128 129 if (to_fd == -1 && (fflag || tolnk)) { 130 /* 131 * attempt to remove existing destination file name and 132 * create a new file 133 */ 134 (void)unlink(to.p_path); 135 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 136 fs->st_mode & ~(S_ISUID | S_ISGID)); 137 } 138 139 if (to_fd == -1) { 140 warn("%s", to.p_path); 141 (void)close(from_fd); 142 return (1); 143 } 144 145 rval = 0; 146 147 /* 148 * There's no reason to do anything other than close the file 149 * now if it's empty, so let's not bother. 150 */ 151 152 if (fs->st_size > 0) { 153 /* 154 * Mmap and write if less than 8M (the limit is so 155 * we don't totally trash memory on big files). 156 * This is really a minor hack, but it wins some CPU back. 157 */ 158 bool use_read; 159 160 use_read = true; 161 if (fs->st_size <= MMAP_MAX_SIZE) { 162 size_t fsize = (size_t)fs->st_size; 163 p = mmap(NULL, fsize, PROT_READ, MAP_FILE|MAP_SHARED, 164 from_fd, (off_t)0); 165 if (p != MAP_FAILED) { 166 size_t remainder; 167 168 use_read = false; 169 170 (void) madvise(p, (size_t)fs->st_size, 171 MADV_SEQUENTIAL); 172 173 /* 174 * Write out the data in small chunks to 175 * avoid locking the output file for a 176 * long time if the reading the data from 177 * the source is slow. 178 */ 179 remainder = fsize; 180 do { 181 ssize_t chunk; 182 183 chunk = (remainder > MMAP_MAX_WRITE) ? 184 MMAP_MAX_WRITE : remainder; 185 if (write(to_fd, &p[fsize - remainder], 186 chunk) != chunk) { 187 warn("%s", to.p_path); 188 rval = 1; 189 break; 190 } 191 remainder -= chunk; 192 } while (remainder > 0); 193 194 if (munmap(p, fsize) < 0) { 195 warn("%s", entp->fts_path); 196 rval = 1; 197 } 198 } 199 } 200 201 if (use_read) { 202 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 203 wcount = write(to_fd, buf, (size_t)rcount); 204 if (rcount != wcount || wcount == -1) { 205 warn("%s", to.p_path); 206 rval = 1; 207 break; 208 } 209 } 210 if (rcount < 0) { 211 warn("%s", entp->fts_path); 212 rval = 1; 213 } 214 } 215 } 216 217 if (rval == 1) { 218 (void)close(from_fd); 219 (void)close(to_fd); 220 return (1); 221 } 222 223 if (pflag && setfile(fs, to_fd)) 224 rval = 1; 225 /* 226 * If the source was setuid or setgid, lose the bits unless the 227 * copy is owned by the same user and group. 228 */ 229 #define RETAINBITS \ 230 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 231 if (!pflag && dne 232 && fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) { 233 if (fstat(to_fd, &to_stat)) { 234 warn("%s", to.p_path); 235 rval = 1; 236 } else if (fs->st_gid == to_stat.st_gid && 237 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) { 238 warn("%s", to.p_path); 239 rval = 1; 240 } 241 } 242 (void)close(from_fd); 243 if (close(to_fd)) { 244 warn("%s", to.p_path); 245 rval = 1; 246 } 247 /* set the mod/access times now after close of the fd */ 248 if (pflag && set_utimes(to.p_path, fs)) { 249 rval = 1; 250 } 251 return (rval); 252 } 253 254 int 255 copy_link(FTSENT *p, int exists) 256 { 257 int len; 258 char target[MAXPATHLEN]; 259 260 if ((len = readlink(p->fts_path, target, sizeof(target)-1)) == -1) { 261 warn("readlink: %s", p->fts_path); 262 return (1); 263 } 264 target[len] = '\0'; 265 if (exists && unlink(to.p_path)) { 266 warn("unlink: %s", to.p_path); 267 return (1); 268 } 269 if (symlink(target, to.p_path)) { 270 warn("symlink: %s", target); 271 return (1); 272 } 273 return (pflag ? setfile(p->fts_statp, 0) : 0); 274 } 275 276 int 277 copy_fifo(struct stat *from_stat, int exists) 278 { 279 if (exists && unlink(to.p_path)) { 280 warn("unlink: %s", to.p_path); 281 return (1); 282 } 283 if (mkfifo(to.p_path, from_stat->st_mode)) { 284 warn("mkfifo: %s", to.p_path); 285 return (1); 286 } 287 return (pflag ? setfile(from_stat, 0) : 0); 288 } 289 290 int 291 copy_special(struct stat *from_stat, int exists) 292 { 293 if (exists && unlink(to.p_path)) { 294 warn("unlink: %s", to.p_path); 295 return (1); 296 } 297 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 298 warn("mknod: %s", to.p_path); 299 return (1); 300 } 301 return (pflag ? setfile(from_stat, 0) : 0); 302 } 303 304 305 /* 306 * Function: setfile 307 * 308 * Purpose: 309 * Set the owner/group/permissions for the "to" file to the information 310 * in the stat structure. If fd is zero, also call set_utimes() to set 311 * the mod/access times. If fd is non-zero, the caller must do a utimes 312 * itself after close(fd). 313 */ 314 int 315 setfile(struct stat *fs, int fd) 316 { 317 int rval, islink; 318 319 rval = 0; 320 islink = S_ISLNK(fs->st_mode); 321 fs->st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO; 322 323 /* 324 * Changing the ownership probably won't succeed, unless we're root 325 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 326 * the mode; current BSD behavior is to remove all setuid bits on 327 * chown. If chown fails, lose setuid/setgid bits. 328 */ 329 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 330 lchown(to.p_path, fs->st_uid, fs->st_gid)) { 331 if (errno != EPERM) { 332 warn("chown: %s", to.p_path); 333 rval = 1; 334 } 335 fs->st_mode &= ~(S_ISUID | S_ISGID); 336 } 337 if (fd ? fchmod(fd, fs->st_mode) : lchmod(to.p_path, fs->st_mode)) { 338 warn("chmod: %s", to.p_path); 339 rval = 1; 340 } 341 342 if (!islink && !Nflag) { 343 unsigned long fflags = fs->st_flags; 344 /* 345 * XXX 346 * NFS doesn't support chflags; ignore errors unless 347 * there's reason to believe we're losing bits. 348 * (Note, this still won't be right if the server 349 * supports flags and we were trying to *remove* flags 350 * on a file that we copied, i.e., that we didn't create.) 351 */ 352 errno = 0; 353 if ((fd ? fchflags(fd, fflags) : 354 chflags(to.p_path, fflags)) == -1) 355 if (errno != EOPNOTSUPP || fs->st_flags != 0) { 356 warn("chflags: %s", to.p_path); 357 rval = 1; 358 } 359 } 360 /* if fd is non-zero, caller must call set_utimes() after close() */ 361 if (fd == 0 && set_utimes(to.p_path, fs)) 362 rval = 1; 363 return (rval); 364 } 365 366 void 367 usage(void) 368 { 369 (void)fprintf(stderr, 370 "usage: %s [-R [-H | -L | -P]] [-f | -i] [-aNpv] src target\n" 371 " %s [-R [-H | -L | -P]] [-f | -i] [-aNpv] src1 ... srcN directory\n", 372 getprogname(), getprogname()); 373 exit(1); 374 /* NOTREACHED */ 375 } 376