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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifndef lint 31 #if 0 32 static char sccsid[] = "@(#)utils.c 8.3 (Berkeley) 4/1/94"; 33 #endif 34 #endif /* not lint */ 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/param.h> 39 #include <sys/stat.h> 40 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 41 #include <sys/mman.h> 42 #endif 43 44 #include <err.h> 45 #include <errno.h> 46 #include <fcntl.h> 47 #include <fts.h> 48 #include <limits.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <sysexits.h> 52 #include <unistd.h> 53 54 #include "extern.h" 55 #define cp_pct(x,y) (int)(100.0 * (double)(x) / (double)(y)) 56 57 int 58 copy_file(const FTSENT *entp, int dne) 59 { 60 static char buf[MAXBSIZE]; 61 struct stat *fs; 62 int ch, checkch, from_fd, rcount, rval, to_fd; 63 ssize_t wcount; 64 size_t wresid; 65 size_t wtotal; 66 char *bufp; 67 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 68 char *p; 69 #endif 70 71 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 72 warn("%s", entp->fts_path); 73 return (1); 74 } 75 76 fs = entp->fts_statp; 77 78 /* 79 * If the file exists and we're interactive, verify with the user. 80 * If the file DNE, set the mode to be the from file, minus setuid 81 * bits, modified by the umask; arguably wrong, but it makes copying 82 * executables work right and it's been that way forever. (The 83 * other choice is 666 or'ed with the execute bits on the from file 84 * modified by the umask.) 85 */ 86 if (!dne) { 87 #define YESNO "(y/n [n]) " 88 if (nflag) { 89 if (vflag) 90 printf("%s not overwritten\n", to.p_path); 91 return (0); 92 } else if (iflag) { 93 (void)fprintf(stderr, "overwrite %s? %s", 94 to.p_path, YESNO); 95 checkch = ch = getchar(); 96 while (ch != '\n' && ch != EOF) 97 ch = getchar(); 98 if (checkch != 'y' && checkch != 'Y') { 99 (void)close(from_fd); 100 (void)fprintf(stderr, "not overwritten\n"); 101 return (1); 102 } 103 } 104 105 if (fflag) { 106 /* remove existing destination file name, 107 * create a new file */ 108 (void)unlink(to.p_path); 109 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 110 fs->st_mode & ~(S_ISUID | S_ISGID)); 111 } else 112 /* overwrite existing destination file name */ 113 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 114 } else 115 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 116 fs->st_mode & ~(S_ISUID | S_ISGID)); 117 118 if (to_fd == -1) { 119 warn("%s", to.p_path); 120 (void)close(from_fd); 121 return (1); 122 } 123 124 rval = 0; 125 126 /* 127 * Mmap and write if less than 8M (the limit is so we don't totally 128 * trash memory on big files. This is really a minor hack, but it 129 * wins some CPU back. 130 */ 131 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 132 if (S_ISREG(fs->st_mode) && fs->st_size > 0 && 133 fs->st_size <= 8 * 1048576) { 134 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 135 MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) { 136 warn("%s", entp->fts_path); 137 rval = 1; 138 } else { 139 wtotal = 0; 140 for (bufp = p, wresid = fs->st_size; ; 141 bufp += wcount, wresid -= (size_t)wcount) { 142 wcount = write(to_fd, bufp, wresid); 143 wtotal += wcount; 144 if (info) { 145 info = 0; 146 (void)fprintf(stderr, 147 "%s -> %s %3d%%\n", 148 entp->fts_path, to.p_path, 149 cp_pct(wtotal, fs->st_size)); 150 151 } 152 if (wcount >= (ssize_t)wresid || wcount <= 0) 153 break; 154 } 155 if (wcount != (ssize_t)wresid) { 156 warn("%s", to.p_path); 157 rval = 1; 158 } 159 /* Some systems don't unmap on close(2). */ 160 if (munmap(p, fs->st_size) < 0) { 161 warn("%s", entp->fts_path); 162 rval = 1; 163 } 164 } 165 } else 166 #endif 167 { 168 wtotal = 0; 169 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 170 for (bufp = buf, wresid = rcount; ; 171 bufp += wcount, wresid -= wcount) { 172 wcount = write(to_fd, bufp, wresid); 173 wtotal += wcount; 174 if (info) { 175 info = 0; 176 (void)fprintf(stderr, 177 "%s -> %s %3d%%\n", 178 entp->fts_path, to.p_path, 179 cp_pct(wtotal, fs->st_size)); 180 181 } 182 if (wcount >= (ssize_t)wresid || wcount <= 0) 183 break; 184 } 185 if (wcount != (ssize_t)wresid) { 186 warn("%s", to.p_path); 187 rval = 1; 188 break; 189 } 190 } 191 if (rcount < 0) { 192 warn("%s", entp->fts_path); 193 rval = 1; 194 } 195 } 196 197 /* 198 * Don't remove the target even after an error. The target might 199 * not be a regular file, or its attributes might be important, 200 * or its contents might be irreplaceable. It would only be safe 201 * to remove it if we created it and its length is 0. 202 */ 203 204 if (pflag && setfile(fs, to_fd)) 205 rval = 1; 206 (void)close(from_fd); 207 if (close(to_fd)) { 208 warn("%s", to.p_path); 209 rval = 1; 210 } 211 return (rval); 212 } 213 214 int 215 copy_link(const FTSENT *p, int exists) 216 { 217 int len; 218 char llink[PATH_MAX]; 219 220 if ((len = readlink(p->fts_path, llink, sizeof(llink) - 1)) == -1) { 221 warn("readlink: %s", p->fts_path); 222 return (1); 223 } 224 llink[len] = '\0'; 225 if (exists && unlink(to.p_path)) { 226 warn("unlink: %s", to.p_path); 227 return (1); 228 } 229 if (symlink(llink, to.p_path)) { 230 warn("symlink: %s", llink); 231 return (1); 232 } 233 return (pflag ? setfile(p->fts_statp, -1) : 0); 234 } 235 236 int 237 copy_fifo(struct stat *from_stat, int exists) 238 { 239 if (exists && unlink(to.p_path)) { 240 warn("unlink: %s", to.p_path); 241 return (1); 242 } 243 if (mkfifo(to.p_path, from_stat->st_mode)) { 244 warn("mkfifo: %s", to.p_path); 245 return (1); 246 } 247 return (pflag ? setfile(from_stat, -1) : 0); 248 } 249 250 int 251 copy_special(struct stat *from_stat, int exists) 252 { 253 if (exists && unlink(to.p_path)) { 254 warn("unlink: %s", to.p_path); 255 return (1); 256 } 257 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 258 warn("mknod: %s", to.p_path); 259 return (1); 260 } 261 return (pflag ? setfile(from_stat, -1) : 0); 262 } 263 264 int 265 setfile(struct stat *fs, int fd) 266 { 267 static struct timeval tv[2]; 268 struct stat ts; 269 int rval, gotstat, islink, fdval; 270 271 rval = 0; 272 fdval = fd != -1; 273 islink = !fdval && S_ISLNK(fs->st_mode); 274 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | 275 S_IRWXU | S_IRWXG | S_IRWXO; 276 277 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 278 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 279 if (islink ? lutimes(to.p_path, tv) : utimes(to.p_path, tv)) { 280 warn("%sutimes: %s", islink ? "l" : "", to.p_path); 281 rval = 1; 282 } 283 if (fdval ? fstat(fd, &ts) : 284 (islink ? lstat(to.p_path, &ts) : stat(to.p_path, &ts))) 285 gotstat = 0; 286 else { 287 gotstat = 1; 288 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX | 289 S_IRWXU | S_IRWXG | S_IRWXO; 290 } 291 /* 292 * Changing the ownership probably won't succeed, unless we're root 293 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 294 * the mode; current BSD behavior is to remove all setuid bits on 295 * chown. If chown fails, lose setuid/setgid bits. 296 */ 297 if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid) 298 if (fdval ? fchown(fd, fs->st_uid, fs->st_gid) : 299 (islink ? lchown(to.p_path, 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 (fdval ? fchmod(fd, fs->st_mode) : 310 (islink ? lchmod(to.p_path, fs->st_mode) : 311 chmod(to.p_path, fs->st_mode))) { 312 warn("chmod: %s", to.p_path); 313 rval = 1; 314 } 315 316 if (!gotstat || fs->st_flags != ts.st_flags) 317 if (fdval ? 318 fchflags(fd, fs->st_flags) : 319 (islink ? (errno = ENOSYS) : 320 chflags(to.p_path, fs->st_flags))) { 321 warn("chflags: %s", to.p_path); 322 rval = 1; 323 } 324 325 return (rval); 326 } 327 328 void 329 usage(void) 330 { 331 332 (void)fprintf(stderr, "%s\n%s\n", 333 "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src target", 334 " cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src1 ... srcN directory"); 335 exit(EX_USAGE); 336 } 337