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 #endif
  62
  63 #include "extern.h"
  64
  65 int
  66 copy_file(FTSENT *entp, int dne)
  67 {
  68         static char buf[MAXBSIZE];
  69         struct stat *fs;
  70         int ch, checkch, from_fd, rcount, rval, to_fd;
  71         ssize_t wcount;
  72         size_t wresid;
  73         char *bufp;
  74 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
  75         char *p;
  76 #endif
  77
  78         if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) {
  79                 warn("%s", entp->fts_path);
  80                 return (1);
  81         }
  82
  83         fs = entp->fts_statp;
  84
  85         /*
  86          * If the file exists and we're interactive, verify with the user.
  87          * If the file DNE, set the mode to be the from file, minus setuid
  88          * bits, modified by the umask; arguably wrong, but it makes copying
  89          * executables work right and it's been that way forever.  (The
  90          * other choice is 666 or'ed with the execute bits on the from file
  91          * modified by the umask.)
  92          */
  93         if (!dne) {
  94 #define YESNO "(y/n [n]) "
  95                 if (nflag) {
  96                         if (vflag)
  97                                 printf("%s not overwritten\n", to.p_path);
  98                         close(from_fd);
  99                         return (0);
 100                 } else if (iflag) {
 101                         (void)fprintf(stderr, "overwrite %s? %s",
 102                                         to.p_path, YESNO);
 103                         checkch = ch = getchar();
 104                         while (ch != '\n' && ch != EOF)
 105                                 ch = getchar();
 106                         if (checkch != 'y' && checkch != 'Y') {
 107                                 (void)close(from_fd);
 108                                 (void)fprintf(stderr, "not overwritten\n");
 109                                 return (1);
 110                         }
 111                 }
 112
 113                 if (fflag) {
 114                     /* remove existing destination file name,
 115                      * create a new file  */
 116                     (void)unlink(to.p_path);
 117                     to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT,
 118                                  fs->st_mode & ~(S_ISUID | S_ISGID));
 119                 } else
 120                     /* overwrite existing destination file name */
 121                     to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0);
 122         } else
 123                 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT,
 124                     fs->st_mode & ~(S_ISUID | S_ISGID));
 125
 126         if (to_fd == -1) {
 127                 warn("%s", to.p_path);
 128                 (void)close(from_fd);
 129                 return (1);
 130         }
 131
 132         rval = 0;
 133
 134         /*
 135          * Mmap and write if less than 8M (the limit is so we don't totally
 136          * trash memory on big files.  This is really a minor hack, but it
 137          * wins some CPU back.
 138          */
 139 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
 140         if (S_ISREG(fs->st_mode) && fs->st_size <= 8 * 1048576) {
 141                 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ,
 142                     MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) {
 143                         warn("%s", entp->fts_path);
 144                         rval = 1;
 145                 } else {
 146                         for (bufp = p, wresid = fs->st_size; ;
 147                             bufp += wcount, wresid -= (size_t)wcount) {
 148                                 wcount = write(to_fd, bufp, wresid);
 149                                 if (wcount >= (ssize_t)wresid || wcount <= 0)
 150                                         break;
 151                         }
 152                         if (wcount != (ssize_t)wresid) {
 153                                 warn("%s", to.p_path);
 154                                 rval = 1;
 155                         }
 156                         /* Some systems don't unmap on close(2). */
 157                         if (munmap(p, fs->st_size) < 0) {
 158                                 warn("%s", entp->fts_path);
 159                                 rval = 1;
 160                         }
 161                 }
 162         } else
 163 #endif
 164         {
 165                 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
 166                         for (bufp = buf, wresid = rcount; ;
 167                             bufp += wcount, wresid -= wcount) {
 168                                 wcount = write(to_fd, bufp, wresid);
 169                                 if (wcount >= (ssize_t)wresid || wcount <= 0)
 170                                         break;
 171                         }
 172                         if (wcount != (ssize_t)wresid) {
 173                                 warn("%s", to.p_path);
 174                                 rval = 1;
 175                                 break;
 176                         }
 177                 }
 178                 if (rcount < 0) {
 179                         warn("%s", entp->fts_path);
 180                         rval = 1;
 181                 }
 182         }
 183
 184 #ifdef __APPLE__
 185         if (pflag)
 186                 copyfile(entp->fts_path, to.p_path, 0, COPYFILE_XATTR | COPYFILE_ACL);
 187         else
 188                 copyfile(entp->fts_path, to.p_path, 0, COPYFILE_XATTR);
 189 #endif
 190         /*
 191          * Don't remove the target even after an error.  The target might
 192          * not be a regular file, or its attributes might be important,
 193          * or its contents might be irreplaceable.  It would only be safe
 194          * to remove it if we created it and its length is 0.
 195          */
 196
 197         if (pflag && setfile(fs, to_fd))
 198                 rval = 1;
 199         (void)close(from_fd);
 200         if (close(to_fd)) {
 201                 warn("%s", to.p_path);
 202                 rval = 1;
 203         }
 204         return (rval);
 205 }
 206
 207 int
 208 copy_link(FTSENT *p, int exists)
 209 {
 210         int len;
 211         char llink[PATH_MAX];
 212
 213         if ((len = readlink(p->fts_path, llink, sizeof(llink) - 1)) == -1) {
 214                 warn("readlink: %s", p->fts_path);
 215                 return (1);
 216         }
 217         llink[len] = '\0';
 218         if (exists && unlink(to.p_path)) {
 219                 warn("unlink: %s", to.p_path);
 220                 return (1);
 221         }
 222         if (symlink(llink, to.p_path)) {
 223                 warn("symlink: %s", llink);
 224                 return (1);
 225         }
 226 #ifdef __APPLE__
 227             copyfile(p->fts_path, to.p_path, 0, COPYFILE_XATTR | COPYFILE_NOFOLLOW_SRC);
 228 #endif
 229         return (0);
 230 }
 231
 232 int
 233 copy_fifo(struct stat *from_stat, int exists)
 234 {
 235         if (exists && unlink(to.p_path)) {
 236                 warn("unlink: %s", to.p_path);
 237                 return (1);
 238         }
 239         if (mkfifo(to.p_path, from_stat->st_mode)) {
 240                 warn("mkfifo: %s", to.p_path);
 241                 return (1);
 242         }
 243         return (pflag ? setfile(from_stat, 0) : 0);
 244 }
 245
 246 int
 247 copy_special(struct stat *from_stat, int exists)
 248 {
 249         if (exists && unlink(to.p_path)) {
 250                 warn("unlink: %s", to.p_path);
 251                 return (1);
 252         }
 253         if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) {
 254                 warn("mknod: %s", to.p_path);
 255                 return (1);
 256         }
 257         return (pflag ? setfile(from_stat, 0) : 0);
 258 }
 259
 260 int
 261 setfile(struct stat *fs, int fd)
 262 {
 263         static struct timeval tv[2];
 264         struct stat ts;
 265         int rval;
 266         int gotstat;
 267
 268         rval = 0;
 269         fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX |
 270                        S_IRWXU | S_IRWXG | S_IRWXO;
 271
 272         TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec);
 273         TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec);
 274         if (utimes(to.p_path, tv)) {
 275                 warn("utimes: %s", to.p_path);
 276                 rval = 1;
 277         }
 278         if (fd ? fstat(fd, &ts) : stat(to.p_path, &ts))
 279                 gotstat = 0;
 280         else {
 281                 gotstat = 1;
 282                 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX |
 283                               S_IRWXU | S_IRWXG | S_IRWXO;
 284         }
 285         /*
 286          * Changing the ownership probably won't succeed, unless we're root
 287          * or POSIX_CHOWN_RESTRICTED is not set.  Set uid/gid before setting
 288          * the mode; current BSD behavior is to remove all setuid bits on
 289          * chown.  If chown fails, lose setuid/setgid bits.
 290          */
 291         if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid)
 292                 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) :
 293                     chown(to.p_path, fs->st_uid, fs->st_gid)) {
 294                         if (errno != EPERM) {
 295                                 warn("chown: %s", to.p_path);
 296                                 rval = 1;
 297                         }
 298                         fs->st_mode &= ~(S_ISUID | S_ISGID);
 299                 }
 300
 301         if (!gotstat || fs->st_mode != ts.st_mode)
 302                 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) {
 303                         warn("chmod: %s", to.p_path);
 304                         rval = 1;
 305                 }
 306
 307         if (!gotstat || fs->st_flags != ts.st_flags)
 308                 if (fd ?
 309                     fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) {
 310                         warn("chflags: %s", to.p_path);
 311                         rval = 1;
 312                 }
 313
 314         return (rval);
 315 }
 316
 317 void
 318 usage(void)
 319 {
 320
 321         (void)fprintf(stderr, "%s\n%s\n",
 322 "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src target",
 323 "       cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src1 ... srcN directory");
 324         exit(EX_USAGE);
 325 }