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 #define cp_pct(x,y) (int)(100.0 * (double)(x) / (double)(y)) 60 61 int 62 copy_file(const FTSENT *entp, int dne) 63 { 64 static char buf[MAXBSIZE]; 65 struct stat *fs; 66 int ch, checkch, from_fd, rcount, rval, to_fd; 67 ssize_t wcount; 68 size_t wresid; 69 size_t wtotal; 70 char *bufp; 71 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 72 char *p; 73 #endif 74 75 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 76 warn("%s", entp->fts_path); 77 return (1); 78 } 79 80 fs = entp->fts_statp; 81 82 /* 83 * If the file exists and we're interactive, verify with the user. 84 * If the file DNE, set the mode to be the from file, minus setuid 85 * bits, modified by the umask; arguably wrong, but it makes copying 86 * executables work right and it's been that way forever. (The 87 * other choice is 666 or'ed with the execute bits on the from file 88 * modified by the umask.) 89 */ 90 if (!dne) { 91 #define YESNO "(y/n [n]) " 92 if (nflag) { 93 if (vflag) 94 printf("%s not overwritten\n", to.p_path); 95 return (0); 96 } else if (iflag) { 97 (void)fprintf(stderr, "overwrite %s? %s", 98 to.p_path, YESNO); 99 checkch = ch = getchar(); 100 while (ch != '\n' && ch != EOF) 101 ch = getchar(); 102 if (checkch != 'y' && checkch != 'Y') { 103 (void)close(from_fd); 104 (void)fprintf(stderr, "not overwritten\n"); 105 return (1); 106 } 107 } 108 109 if (fflag) { 110 /* remove existing destination file name, 111 * create a new file */ 112 (void)unlink(to.p_path); 113 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 114 fs->st_mode & ~(S_ISUID | S_ISGID)); 115 } else 116 /* overwrite existing destination file name */ 117 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 118 } else 119 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 120 fs->st_mode & ~(S_ISUID | S_ISGID)); 121 122 if (to_fd == -1) { 123 warn("%s", to.p_path); 124 (void)close(from_fd); 125 return (1); 126 } 127 128 rval = 0; 129 130 /* 131 * Mmap and write if less than 8M (the limit is so we don't totally 132 * trash memory on big files. This is really a minor hack, but it 133 * wins some CPU back. 134 */ 135 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 136 if (S_ISREG(fs->st_mode) && fs->st_size <= 8 * 1048576) { 137 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 138 MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) { 139 warn("%s", entp->fts_path); 140 rval = 1; 141 } else { 142 wtotal = 0; 143 for (bufp = p, wresid = fs->st_size; ; 144 bufp += wcount, wresid -= (size_t)wcount) { 145 wcount = write(to_fd, bufp, wresid); 146 wtotal += wcount; 147 if (info) { 148 info = 0; 149 (void)fprintf(stderr, 150 "%s -> %s %3d%%\n", 151 entp->fts_path, to.p_path, 152 cp_pct(wtotal, fs->st_size)); 153 154 } 155 if (wcount >= (ssize_t)wresid || wcount <= 0) 156 break; 157 } 158 if (wcount != (ssize_t)wresid) { 159 warn("%s", to.p_path); 160 rval = 1; 161 } 162 /* Some systems don't unmap on close(2). */ 163 if (munmap(p, fs->st_size) < 0) { 164 warn("%s", entp->fts_path); 165 rval = 1; 166 } 167 } 168 } else 169 #endif 170 { 171 wtotal = 0; 172 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 173 for (bufp = buf, wresid = rcount; ; 174 bufp += wcount, wresid -= wcount) { 175 wcount = write(to_fd, bufp, wresid); 176 wtotal += wcount; 177 if (info) { 178 info = 0; 179 (void)fprintf(stderr, 180 "%s -> %s %3d%%\n", 181 entp->fts_path, to.p_path, 182 cp_pct(wtotal, fs->st_size)); 183 184 } 185 if (wcount >= (ssize_t)wresid || wcount <= 0) 186 break; 187 } 188 if (wcount != (ssize_t)wresid) { 189 warn("%s", to.p_path); 190 rval = 1; 191 break; 192 } 193 } 194 if (rcount < 0) { 195 warn("%s", entp->fts_path); 196 rval = 1; 197 } 198 } 199 200 /* 201 * Don't remove the target even after an error. The target might 202 * not be a regular file, or its attributes might be important, 203 * or its contents might be irreplaceable. It would only be safe 204 * to remove it if we created it and its length is 0. 205 */ 206 207 if (pflag && setfile(fs, to_fd)) 208 rval = 1; 209 (void)close(from_fd); 210 if (close(to_fd)) { 211 warn("%s", to.p_path); 212 rval = 1; 213 } 214 return (rval); 215 } 216 217 int 218 copy_link(const FTSENT *p, int exists) 219 { 220 int len; 221 char llink[PATH_MAX]; 222 223 if ((len = readlink(p->fts_path, llink, sizeof(llink) - 1)) == -1) { 224 warn("readlink: %s", p->fts_path); 225 return (1); 226 } 227 llink[len] = '\0'; 228 if (exists && unlink(to.p_path)) { 229 warn("unlink: %s", to.p_path); 230 return (1); 231 } 232 if (symlink(llink, to.p_path)) { 233 warn("symlink: %s", llink); 234 return (1); 235 } 236 return (0); 237 } 238 239 int 240 copy_fifo(struct stat *from_stat, int exists) 241 { 242 if (exists && unlink(to.p_path)) { 243 warn("unlink: %s", to.p_path); 244 return (1); 245 } 246 if (mkfifo(to.p_path, from_stat->st_mode)) { 247 warn("mkfifo: %s", to.p_path); 248 return (1); 249 } 250 return (pflag ? setfile(from_stat, 0) : 0); 251 } 252 253 int 254 copy_special(struct stat *from_stat, int exists) 255 { 256 if (exists && unlink(to.p_path)) { 257 warn("unlink: %s", to.p_path); 258 return (1); 259 } 260 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 261 warn("mknod: %s", to.p_path); 262 return (1); 263 } 264 return (pflag ? setfile(from_stat, 0) : 0); 265 } 266 267 int 268 setfile(struct stat *fs, int fd) 269 { 270 static struct timeval tv[2]; 271 struct stat ts; 272 int rval; 273 int gotstat; 274 275 rval = 0; 276 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | 277 S_IRWXU | S_IRWXG | S_IRWXO; 278 279 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 280 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 281 if (utimes(to.p_path, tv)) { 282 warn("utimes: %s", to.p_path); 283 rval = 1; 284 } 285 if (fd ? fstat(fd, &ts) : stat(to.p_path, &ts)) 286 gotstat = 0; 287 else { 288 gotstat = 1; 289 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX | 290 S_IRWXU | S_IRWXG | S_IRWXO; 291 } 292 /* 293 * Changing the ownership probably won't succeed, unless we're root 294 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 295 * the mode; current BSD behavior is to remove all setuid bits on 296 * chown. If chown fails, lose setuid/setgid bits. 297 */ 298 if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid) 299 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 300 chown(to.p_path, fs->st_uid, fs->st_gid)) { 301 if (errno != EPERM) { 302 warn("chown: %s", to.p_path); 303 rval = 1; 304 } 305 fs->st_mode &= ~(S_ISUID | S_ISGID); 306 } 307 308 if (!gotstat || fs->st_mode != ts.st_mode) 309 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) { 310 warn("chmod: %s", to.p_path); 311 rval = 1; 312 } 313 314 if (!gotstat || fs->st_flags != ts.st_flags) 315 if (fd ? 316 fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) { 317 warn("chflags: %s", to.p_path); 318 rval = 1; 319 } 320 321 return (rval); 322 } 323 324 void 325 usage(void) 326 { 327 328 (void)fprintf(stderr, "%s\n%s\n", 329 "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src target", 330 " cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src1 ... srcN directory"); 331 exit(EX_USAGE); 332 } 333