cp/utils.c

   1 /*-
   2  * Copyright (c) 1991, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifndef lint
  35 #if 0
  36 static char sccsid[] = "@(#)utils.c     8.3 (Berkeley) 4/1/94";
  37 #endif
  38 #endif /* not lint */
  39 #include <sys/cdefs.h>
  40 __RCSID("$FreeBSD: src/bin/cp/utils.c,v 1.38 2002/07/31 16:52:16 markm Exp $");
  41
  42 #include <sys/param.h>
  43 #include <sys/time.h>
  44 #include <sys/stat.h>
  45 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
  46 #include <sys/mman.h>
  47 #endif
  48
  49 #include <err.h>
  50 #include <errno.h>
  51 #include <fcntl.h>
  52 #include <fts.h>
  53 #include <limits.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <sysexits.h>
  57 #include <unistd.h>
  58
  59 #ifdef __APPLE__
  60 #include <copyfile.h>
  61 #include <string.h>
  62 #include <sys/mount.h>
  63 #endif
  64
  65 #include "extern.h"
  66
  67 int
  68 copy_file(FTSENT *entp, int dne)
  69 {
  70         static char buf[MAXBSIZE];
  71         struct stat *fs;
  72         int ch, checkch, from_fd, rcount, rval, to_fd;
  73         ssize_t wcount;
  74         size_t wresid;
  75         char *bufp;
  76 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
  77         char *p;
  78 #endif
  79
  80         if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) {
  81                 warn("%s", entp->fts_path);
  82                 return (1);
  83         }
  84
  85         fs = entp->fts_statp;
  86
  87         /*
  88          * If the file exists and we're interactive, verify with the user.
  89          * If the file DNE, set the mode to be the from file, minus setuid
  90          * bits, modified by the umask; arguably wrong, but it makes copying
  91          * executables work right and it's been that way forever.  (The
  92          * other choice is 666 or'ed with the execute bits on the from file
  93          * modified by the umask.)
  94          */
  95         if (!dne) {
  96 #define YESNO "(y/n [n]) "
  97                 if (nflag) {
  98                         if (vflag)
  99                                 printf("%s not overwritten\n", to.p_path);
 100                         close(from_fd);
 101                         return (0);
 102                 } else if (iflag) {
 103                         (void)fprintf(stderr, "overwrite %s? %s",
 104                                         to.p_path, YESNO);
 105                         checkch = ch = getchar();
 106                         while (ch != '\n' && ch != EOF)
 107                                 ch = getchar();
 108                         if (checkch != 'y' && checkch != 'Y') {
 109                                 (void)close(from_fd);
 110                                 (void)fprintf(stderr, "not overwritten\n");
 111                                 return (1);
 112                         }
 113                 }
 114
 115                 if (fflag) {
 116                     /* remove existing destination file name,
 117                      * create a new file  */
 118                     (void)unlink(to.p_path);
 119                     to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT,
 120                                  fs->st_mode & ~(S_ISUID | S_ISGID));
 121                 } else
 122                     /* overwrite existing destination file name */
 123                     to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0);
 124         } else
 125                 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT,
 126                     fs->st_mode & ~(S_ISUID | S_ISGID));
 127
 128         if (to_fd == -1) {
 129                 warn("%s", to.p_path);
 130                 (void)close(from_fd);
 131                 return (1);
 132         }
 133
 134         rval = 0;
 135
 136 #ifdef __APPLE__
 137         if (S_ISREG(fs->st_mode)) {
 138                 struct statfs sfs;
 139
 140                 /*
 141                  * Pre-allocate blocks for the destination file if it
 142                  * resides on Xsan.
 143                  */
 144                 if (fstatfs(to_fd, &sfs) == 0 &&
 145                     strcmp(sfs.f_fstypename, "acfs") == 0) {
 146                         fstore_t fst;
 147
 148                         fst.fst_flags = 0;
 149                         fst.fst_posmode = F_PEOFPOSMODE;
 150                         fst.fst_offset = 0;
 151                         fst.fst_length = fs->st_size;
 152
 153                         (void) fcntl(to_fd, F_PREALLOCATE, &fst);
 154                 }
 155         }
 156 #endif /* __APPLE__ */
 157
 158         /*
 159          * Mmap and write if less than 8M (the limit is so we don't totally
 160          * trash memory on big files.  This is really a minor hack, but it
 161          * wins some CPU back.
 162          */
 163 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
 164         if (S_ISREG(fs->st_mode) && fs->st_size <= 8 * 1048576) {
 165                 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ,
 166                     MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) {
 167                         warn("%s", entp->fts_path);
 168                         rval = 1;
 169                 } else {
 170                         for (bufp = p, wresid = fs->st_size; ;
 171                             bufp += wcount, wresid -= (size_t)wcount) {
 172                                 wcount = write(to_fd, bufp, wresid);
 173                                 if (wcount >= (ssize_t)wresid || wcount <= 0)
 174                                         break;
 175                         }
 176                         if (wcount != (ssize_t)wresid) {
 177                                 warn("%s", to.p_path);
 178                                 rval = 1;
 179                         }
 180                         /* Some systems don't unmap on close(2). */
 181                         if (munmap(p, fs->st_size) < 0) {
 182                                 warn("%s", entp->fts_path);
 183                                 rval = 1;
 184                         }
 185                 }
 186         } else
 187 #endif
 188         {
 189                 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
 190                         for (bufp = buf, wresid = rcount; ;
 191                             bufp += wcount, wresid -= wcount) {
 192                                 wcount = write(to_fd, bufp, wresid);
 193                                 if (wcount >= (ssize_t)wresid || wcount <= 0)
 194                                         break;
 195                         }
 196                         if (wcount != (ssize_t)wresid) {
 197                                 warn("%s", to.p_path);
 198                                 rval = 1;
 199                                 break;
 200                         }
 201                 }
 202                 if (rcount < 0) {
 203                         warn("%s", entp->fts_path);
 204                         rval = 1;
 205                 }
 206         }
 207
 208 #ifdef __APPLE__
 209         if (pflag)
 210                 copyfile(entp->fts_path, to.p_path, 0, COPYFILE_XATTR | COPYFILE_ACL);
 211         else
 212                 copyfile(entp->fts_path, to.p_path, 0, COPYFILE_XATTR);
 213 #endif
 214         /*
 215          * Don't remove the target even after an error.  The target might
 216          * not be a regular file, or its attributes might be important,
 217          * or its contents might be irreplaceable.  It would only be safe
 218          * to remove it if we created it and its length is 0.
 219          */
 220
 221         if (pflag && setfile(fs, to_fd))
 222                 rval = 1;
 223         (void)close(from_fd);
 224         if (close(to_fd)) {
 225                 warn("%s", to.p_path);
 226                 rval = 1;
 227         }
 228         return (rval);
 229 }
 230
 231 int
 232 copy_link(FTSENT *p, int exists)
 233 {
 234         int len;
 235         char llink[PATH_MAX];
 236
 237         if ((len = readlink(p->fts_path, llink, sizeof(llink) - 1)) == -1) {
 238                 warn("readlink: %s", p->fts_path);
 239                 return (1);
 240         }
 241         llink[len] = '\0';
 242         if (exists && unlink(to.p_path)) {
 243                 warn("unlink: %s", to.p_path);
 244                 return (1);
 245         }
 246         if (symlink(llink, to.p_path)) {
 247                 warn("symlink: %s", llink);
 248                 return (1);
 249         }
 250 #ifdef __APPLE__
 251             copyfile(p->fts_path, to.p_path, 0, COPYFILE_XATTR | COPYFILE_NOFOLLOW_SRC);
 252 #endif
 253         return (0);
 254 }
 255
 256 int
 257 copy_fifo(struct stat *from_stat, int exists)
 258 {
 259         if (exists && unlink(to.p_path)) {
 260                 warn("unlink: %s", to.p_path);
 261                 return (1);
 262         }
 263         if (mkfifo(to.p_path, from_stat->st_mode)) {
 264                 warn("mkfifo: %s", to.p_path);
 265                 return (1);
 266         }
 267         return (pflag ? setfile(from_stat, 0) : 0);
 268 }
 269
 270 int
 271 copy_special(struct stat *from_stat, int exists)
 272 {
 273         if (exists && unlink(to.p_path)) {
 274                 warn("unlink: %s", to.p_path);
 275                 return (1);
 276         }
 277         if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) {
 278                 warn("mknod: %s", to.p_path);
 279                 return (1);
 280         }
 281         return (pflag ? setfile(from_stat, 0) : 0);
 282 }
 283
 284 int
 285 setfile(struct stat *fs, int fd)
 286 {
 287         static struct timeval tv[2];
 288         struct stat ts;
 289         int rval;
 290         int gotstat;
 291
 292         rval = 0;
 293         fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX |
 294                        S_IRWXU | S_IRWXG | S_IRWXO;
 295
 296         TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec);
 297         TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec);
 298         if (utimes(to.p_path, tv)) {
 299                 warn("utimes: %s", to.p_path);
 300                 rval = 1;
 301         }
 302         if (fd ? fstat(fd, &ts) : stat(to.p_path, &ts))
 303                 gotstat = 0;
 304         else {
 305                 gotstat = 1;
 306                 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX |
 307                               S_IRWXU | S_IRWXG | S_IRWXO;
 308         }
 309         /*
 310          * Changing the ownership probably won't succeed, unless we're root
 311          * or POSIX_CHOWN_RESTRICTED is not set.  Set uid/gid before setting
 312          * the mode; current BSD behavior is to remove all setuid bits on
 313          * chown.  If chown fails, lose setuid/setgid bits.
 314          */
 315         if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid)
 316                 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) :
 317                     chown(to.p_path, fs->st_uid, fs->st_gid)) {
 318                         if (errno != EPERM) {
 319                                 warn("chown: %s", to.p_path);
 320                                 rval = 1;
 321                         }
 322                         fs->st_mode &= ~(S_ISUID | S_ISGID);
 323                 }
 324
 325         if (!gotstat || fs->st_mode != ts.st_mode)
 326                 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) {
 327                         warn("chmod: %s", to.p_path);
 328                         rval = 1;
 329                 }
 330
 331         if (!gotstat || fs->st_flags != ts.st_flags)
 332                 if (fd ?
 333                     fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) {
 334                         warn("chflags: %s", to.p_path);
 335                         rval = 1;
 336                 }
 337
 338         return (rval);
 339 }
 340
 341 void
 342 usage(void)
 343 {
 344
 345         (void)fprintf(stderr, "%s\n%s\n",
 346 "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src target",
 347 "       cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src1 ... srcN directory");
 348         exit(EX_USAGE);
 349 }