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 __FBSDID("$FreeBSD$"); 41 42 #include <sys/param.h> 43 #include <sys/stat.h> 44 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 45 #include <sys/mman.h> 46 #endif 47 48 #include <err.h> 49 #include <errno.h> 50 #include <fcntl.h> 51 #include <fts.h> 52 #include <limits.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <sysexits.h> 56 #include <unistd.h> 57 58 #include "extern.h" 59 60 int 61 copy_file(const FTSENT *entp, int dne) 62 { 63 static char buf[MAXBSIZE]; 64 struct stat *fs; 65 int ch, checkch, from_fd, rcount, rval, to_fd; 66 ssize_t wcount; 67 size_t wresid; 68 char *bufp; 69 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 70 char *p; 71 #endif 72 73 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 74 warn("%s", entp->fts_path); 75 return (1); 76 } 77 78 fs = entp->fts_statp; 79 80 /* 81 * If the file exists and we're interactive, verify with the user. 82 * If the file DNE, set the mode to be the from file, minus setuid 83 * bits, modified by the umask; arguably wrong, but it makes copying 84 * executables work right and it's been that way forever. (The 85 * other choice is 666 or'ed with the execute bits on the from file 86 * modified by the umask.) 87 */ 88 if (!dne) { 89 #define YESNO "(y/n [n]) " 90 if (nflag) { 91 if (vflag) 92 printf("%s not overwritten\n", to.p_path); 93 return (0); 94 } else if (iflag) { 95 (void)fprintf(stderr, "overwrite %s? %s", 96 to.p_path, YESNO); 97 checkch = ch = getchar(); 98 while (ch != '\n' && ch != EOF) 99 ch = getchar(); 100 if (checkch != 'y' && checkch != 'Y') { 101 (void)close(from_fd); 102 (void)fprintf(stderr, "not overwritten\n"); 103 return (1); 104 } 105 } 106 107 if (fflag) { 108 /* remove existing destination file name, 109 * create a new file */ 110 (void)unlink(to.p_path); 111 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 112 fs->st_mode & ~(S_ISUID | S_ISGID)); 113 } else 114 /* overwrite existing destination file name */ 115 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 116 } else 117 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 118 fs->st_mode & ~(S_ISUID | S_ISGID)); 119 120 if (to_fd == -1) { 121 warn("%s", to.p_path); 122 (void)close(from_fd); 123 return (1); 124 } 125 126 rval = 0; 127 128 /* 129 * Mmap and write if less than 8M (the limit is so we don't totally 130 * trash memory on big files. This is really a minor hack, but it 131 * wins some CPU back. 132 */ 133 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 134 if (S_ISREG(fs->st_mode) && fs->st_size <= 8 * 1048576) { 135 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 136 MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) { 137 warn("%s", entp->fts_path); 138 rval = 1; 139 } else { 140 for (bufp = p, wresid = fs->st_size; ; 141 bufp += wcount, wresid -= (size_t)wcount) { 142 wcount = write(to_fd, bufp, wresid); 143 if (wcount >= (ssize_t)wresid || wcount <= 0) 144 break; 145 } 146 if (wcount != (ssize_t)wresid) { 147 warn("%s", to.p_path); 148 rval = 1; 149 } 150 /* Some systems don't unmap on close(2). */ 151 if (munmap(p, fs->st_size) < 0) { 152 warn("%s", entp->fts_path); 153 rval = 1; 154 } 155 } 156 } else 157 #endif 158 { 159 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 160 for (bufp = buf, wresid = rcount; ; 161 bufp += wcount, wresid -= wcount) { 162 wcount = write(to_fd, bufp, wresid); 163 if (wcount >= (ssize_t)wresid || wcount <= 0) 164 break; 165 } 166 if (wcount != (ssize_t)wresid) { 167 warn("%s", to.p_path); 168 rval = 1; 169 break; 170 } 171 } 172 if (rcount < 0) { 173 warn("%s", entp->fts_path); 174 rval = 1; 175 } 176 } 177 178 /* 179 * Don't remove the target even after an error. The target might 180 * not be a regular file, or its attributes might be important, 181 * or its contents might be irreplaceable. It would only be safe 182 * to remove it if we created it and its length is 0. 183 */ 184 185 if (pflag && setfile(fs, to_fd)) 186 rval = 1; 187 (void)close(from_fd); 188 if (close(to_fd)) { 189 warn("%s", to.p_path); 190 rval = 1; 191 } 192 return (rval); 193 } 194 195 int 196 copy_link(const FTSENT *p, int exists) 197 { 198 int len; 199 char llink[PATH_MAX]; 200 201 if ((len = readlink(p->fts_path, llink, sizeof(llink) - 1)) == -1) { 202 warn("readlink: %s", p->fts_path); 203 return (1); 204 } 205 llink[len] = '\0'; 206 if (exists && unlink(to.p_path)) { 207 warn("unlink: %s", to.p_path); 208 return (1); 209 } 210 if (symlink(llink, to.p_path)) { 211 warn("symlink: %s", llink); 212 return (1); 213 } 214 return (0); 215 } 216 217 int 218 copy_fifo(struct stat *from_stat, int exists) 219 { 220 if (exists && unlink(to.p_path)) { 221 warn("unlink: %s", to.p_path); 222 return (1); 223 } 224 if (mkfifo(to.p_path, from_stat->st_mode)) { 225 warn("mkfifo: %s", to.p_path); 226 return (1); 227 } 228 return (pflag ? setfile(from_stat, 0) : 0); 229 } 230 231 int 232 copy_special(struct stat *from_stat, int exists) 233 { 234 if (exists && unlink(to.p_path)) { 235 warn("unlink: %s", to.p_path); 236 return (1); 237 } 238 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 239 warn("mknod: %s", to.p_path); 240 return (1); 241 } 242 return (pflag ? setfile(from_stat, 0) : 0); 243 } 244 245 int 246 setfile(struct stat *fs, int fd) 247 { 248 static struct timeval tv[2]; 249 struct stat ts; 250 int rval; 251 int gotstat; 252 253 rval = 0; 254 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | 255 S_IRWXU | S_IRWXG | S_IRWXO; 256 257 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 258 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 259 if (utimes(to.p_path, tv)) { 260 warn("utimes: %s", to.p_path); 261 rval = 1; 262 } 263 if (fd ? fstat(fd, &ts) : stat(to.p_path, &ts)) 264 gotstat = 0; 265 else { 266 gotstat = 1; 267 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX | 268 S_IRWXU | S_IRWXG | S_IRWXO; 269 } 270 /* 271 * Changing the ownership probably won't succeed, unless we're root 272 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 273 * the mode; current BSD behavior is to remove all setuid bits on 274 * chown. If chown fails, lose setuid/setgid bits. 275 */ 276 if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid) 277 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 278 chown(to.p_path, fs->st_uid, fs->st_gid)) { 279 if (errno != EPERM) { 280 warn("chown: %s", to.p_path); 281 rval = 1; 282 } 283 fs->st_mode &= ~(S_ISUID | S_ISGID); 284 } 285 286 if (!gotstat || fs->st_mode != ts.st_mode) 287 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) { 288 warn("chmod: %s", to.p_path); 289 rval = 1; 290 } 291 292 if (!gotstat || fs->st_flags != ts.st_flags) 293 if (fd ? 294 fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) { 295 warn("chflags: %s", to.p_path); 296 rval = 1; 297 } 298 299 return (rval); 300 } 301 302 void 303 usage(void) 304 { 305 306 (void)fprintf(stderr, "%s\n%s\n", 307 "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src target", 308 " cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src1 ... srcN directory"); 309 exit(EX_USAGE); 310 } 311