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utils.c revision 1.2
      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 /*static char sccsid[] = "from: @(#)utils.c	8.3 (Berkeley) 4/1/94";*/
     36 static char *rcsid = "$Id: utils.c,v 1.2 1994/09/22 09:24:43 mycroft Exp $";
     37 #endif /* not lint */
     38 
     39 #include <sys/param.h>
     40 #include <sys/stat.h>
     41 #include <sys/mman.h>
     42 #include <sys/time.h>
     43 
     44 #include <err.h>
     45 #include <errno.h>
     46 #include <fcntl.h>
     47 #include <fts.h>
     48 #include <stdio.h>
     49 #include <stdlib.h>
     50 #include <string.h>
     51 #include <unistd.h>
     52 
     53 #include "extern.h"
     54 
     55 int
     56 copy_file(entp, dne)
     57 	FTSENT *entp;
     58 	int dne;
     59 {
     60 	static char buf[MAXBSIZE];
     61 	struct stat to_stat, *fs;
     62 	int ch, checkch, from_fd, rcount, rval, to_fd, wcount;
     63 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
     64 	char *p;
     65 #endif
     66 
     67 	if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) {
     68 		warn("%s", entp->fts_path);
     69 		return (1);
     70 	}
     71 
     72 	fs = entp->fts_statp;
     73 
     74 	/*
     75 	 * If the file exists and we're interactive, verify with the user.
     76 	 * If the file DNE, set the mode to be the from file, minus setuid
     77 	 * bits, modified by the umask; arguably wrong, but it makes copying
     78 	 * executables work right and it's been that way forever.  (The
     79 	 * other choice is 666 or'ed with the execute bits on the from file
     80 	 * modified by the umask.)
     81 	 */
     82 	if (!dne) {
     83 		if (iflag) {
     84 			(void)fprintf(stderr, "overwrite %s? ", to.p_path);
     85 			checkch = ch = getchar();
     86 			while (ch != '\n' && ch != EOF)
     87 				ch = getchar();
     88 			if (checkch != 'y' && checkch != 'Y') {
     89 				(void)close(from_fd);
     90 				return (0);
     91 			}
     92 		}
     93 		to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0);
     94 	} else
     95 		to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT,
     96 		    fs->st_mode & ~(S_ISUID | S_ISGID));
     97 
     98 	if (to_fd == -1) {
     99 		warn("%s", to.p_path);
    100 		(void)close(from_fd);
    101 		return (1);;
    102 	}
    103 
    104 	rval = 0;
    105 
    106 	/*
    107 	 * Mmap and write if less than 8M (the limit is so we don't totally
    108 	 * trash memory on big files.  This is really a minor hack, but it
    109 	 * wins some CPU back.
    110 	 */
    111 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
    112 	if (fs->st_size <= 8 * 1048576) {
    113 		if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ,
    114 		    0, from_fd, (off_t)0)) == (char *)-1) {
    115 			warn("%s", entp->fts_path);
    116 			rval = 1;
    117 		} else {
    118 			if (write(to_fd, p, fs->st_size) != fs->st_size) {
    119 				warn("%s", to.p_path);
    120 				rval = 1;
    121 			}
    122 			/* Some systems don't unmap on close(2). */
    123 			if (munmap(p, fs->st_size) < 0) {
    124 				warn("%s", entp->fts_path);
    125 				rval = 1;
    126 			}
    127 		}
    128 	} else
    129 #endif
    130 	{
    131 		while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
    132 			wcount = write(to_fd, buf, rcount);
    133 			if (rcount != wcount || wcount == -1) {
    134 				warn("%s", to.p_path);
    135 				rval = 1;
    136 				break;
    137 			}
    138 		}
    139 		if (rcount < 0) {
    140 			warn("%s", entp->fts_path);
    141 			rval = 1;
    142 		}
    143 	}
    144 
    145 	/* If the copy went bad, lose the file. */
    146 	if (rval == 1) {
    147 		(void)unlink(to.p_path);
    148 		(void)close(from_fd);
    149 		(void)close(to_fd);
    150 		return (1);
    151 	}
    152 
    153 	if (pflag && setfile(fs, to_fd))
    154 		rval = 1;
    155 	/*
    156 	 * If the source was setuid or setgid, lose the bits unless the
    157 	 * copy is owned by the same user and group.
    158 	 */
    159 #define	RETAINBITS \
    160 	(S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO)
    161 	else if (fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid)
    162 		if (fstat(to_fd, &to_stat)) {
    163 			warn("%s", to.p_path);
    164 			rval = 1;
    165 		} else if (fs->st_gid == to_stat.st_gid &&
    166 		    fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) {
    167 			warn("%s", to.p_path);
    168 			rval = 1;
    169 		}
    170 	(void)close(from_fd);
    171 	if (close(to_fd)) {
    172 		warn("%s", to.p_path);
    173 		rval = 1;
    174 	}
    175 	return (rval);
    176 }
    177 
    178 int
    179 copy_link(p, exists)
    180 	FTSENT *p;
    181 	int exists;
    182 {
    183 	int len;
    184 	char link[MAXPATHLEN];
    185 
    186 	if ((len = readlink(p->fts_path, link, sizeof(link))) == -1) {
    187 		warn("readlink: %s", p->fts_path);
    188 		return (1);
    189 	}
    190 	link[len] = '\0';
    191 	if (exists && unlink(to.p_path)) {
    192 		warn("unlink: %s", to.p_path);
    193 		return (1);
    194 	}
    195 	if (symlink(link, to.p_path)) {
    196 		warn("symlink: %s", link);
    197 		return (1);
    198 	}
    199 	return (0);
    200 }
    201 
    202 int
    203 copy_fifo(from_stat, exists)
    204 	struct stat *from_stat;
    205 	int exists;
    206 {
    207 	if (exists && unlink(to.p_path)) {
    208 		warn("unlink: %s", to.p_path);
    209 		return (1);
    210 	}
    211 	if (mkfifo(to.p_path, from_stat->st_mode)) {
    212 		warn("mkfifo: %s", to.p_path);
    213 		return (1);
    214 	}
    215 	return (pflag ? setfile(from_stat, 0) : 0);
    216 }
    217 
    218 int
    219 copy_special(from_stat, exists)
    220 	struct stat *from_stat;
    221 	int exists;
    222 {
    223 	if (exists && unlink(to.p_path)) {
    224 		warn("unlink: %s", to.p_path);
    225 		return (1);
    226 	}
    227 	if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) {
    228 		warn("mknod: %s", to.p_path);
    229 		return (1);
    230 	}
    231 	return (pflag ? setfile(from_stat, 0) : 0);
    232 }
    233 
    234 
    235 int
    236 setfile(fs, fd)
    237 	register struct stat *fs;
    238 	int fd;
    239 {
    240 	static struct timeval tv[2];
    241 	int rval;
    242 
    243 	rval = 0;
    244 	fs->st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
    245 
    246 	TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec);
    247 	TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec);
    248 	if (utimes(to.p_path, tv)) {
    249 		warn("utimes: %s", to.p_path);
    250 		rval = 1;
    251 	}
    252 	/*
    253 	 * Changing the ownership probably won't succeed, unless we're root
    254 	 * or POSIX_CHOWN_RESTRICTED is not set.  Set uid/gid before setting
    255 	 * the mode; current BSD behavior is to remove all setuid bits on
    256 	 * chown.  If chown fails, lose setuid/setgid bits.
    257 	 */
    258 	if (fd ? fchown(fd, fs->st_uid, fs->st_gid) :
    259 	    chown(to.p_path, fs->st_uid, fs->st_gid)) {
    260 		if (errno != EPERM) {
    261 			warn("chown: %s", to.p_path);
    262 			rval = 1;
    263 		}
    264 		fs->st_mode &= ~(S_ISUID | S_ISGID);
    265 	}
    266 	if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) {
    267 		warn("chown: %s", to.p_path);
    268 		rval = 1;
    269 	}
    270 
    271 	if (fd ?
    272 	    fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) {
    273 		warn("chflags: %s", to.p_path);
    274 		rval = 1;
    275 	}
    276 	return (rval);
    277 }
    278 
    279 void
    280 usage()
    281 {
    282 	(void)fprintf(stderr, "%s\n%s\n",
    283 "usage: cp [-R [-H | -L | -P] [-fip] src target",
    284 "       cp [-R [-H | -L | -P] [-fip] src1 ... srcN directory");
    285 	exit(1);
    286 }
    287