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 (void)close(from_fd); 92 return (0); 93 } else if (iflag) { 94 (void)fprintf(stderr, "overwrite %s? %s", 95 to.p_path, YESNO); 96 checkch = ch = getchar(); 97 while (ch != '\n' && ch != EOF) 98 ch = getchar(); 99 if (checkch != 'y' && checkch != 'Y') { 100 (void)close(from_fd); 101 (void)fprintf(stderr, "not overwritten\n"); 102 return (1); 103 } 104 } 105 106 if (fflag) { 107 /* remove existing destination file name, 108 * create a new file */ 109 (void)unlink(to.p_path); 110 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 111 fs->st_mode & ~(S_ISUID | S_ISGID)); 112 } else 113 /* overwrite existing destination file name */ 114 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 115 } else 116 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 117 fs->st_mode & ~(S_ISUID | S_ISGID)); 118 119 if (to_fd == -1) { 120 warn("%s", to.p_path); 121 (void)close(from_fd); 122 return (1); 123 } 124 125 rval = 0; 126 127 /* 128 * Mmap and write if less than 8M (the limit is so we don't totally 129 * trash memory on big files. This is really a minor hack, but it 130 * wins some CPU back. 131 */ 132 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 133 if (S_ISREG(fs->st_mode) && fs->st_size > 0 && 134 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 wtotal = 0; 141 for (bufp = p, wresid = fs->st_size; ; 142 bufp += wcount, wresid -= (size_t)wcount) { 143 wcount = write(to_fd, bufp, wresid); 144 wtotal += wcount; 145 if (info) { 146 info = 0; 147 (void)fprintf(stderr, 148 "%s -> %s %3d%%\n", 149 entp->fts_path, to.p_path, 150 cp_pct(wtotal, fs->st_size)); 151 152 } 153 if (wcount >= (ssize_t)wresid || wcount <= 0) 154 break; 155 } 156 if (wcount != (ssize_t)wresid) { 157 warn("%s", to.p_path); 158 rval = 1; 159 } 160 /* Some systems don't unmap on close(2). */ 161 if (munmap(p, fs->st_size) < 0) { 162 warn("%s", entp->fts_path); 163 rval = 1; 164 } 165 } 166 } else 167 #endif 168 { 169 wtotal = 0; 170 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 171 for (bufp = buf, wresid = rcount; ; 172 bufp += wcount, wresid -= wcount) { 173 wcount = write(to_fd, bufp, wresid); 174 wtotal += wcount; 175 if (info) { 176 info = 0; 177 (void)fprintf(stderr, 178 "%s -> %s %3d%%\n", 179 entp->fts_path, to.p_path, 180 cp_pct(wtotal, fs->st_size)); 181 182 } 183 if (wcount >= (ssize_t)wresid || wcount <= 0) 184 break; 185 } 186 if (wcount != (ssize_t)wresid) { 187 warn("%s", to.p_path); 188 rval = 1; 189 break; 190 } 191 } 192 if (rcount < 0) { 193 warn("%s", entp->fts_path); 194 rval = 1; 195 } 196 } 197 198 /* 199 * Don't remove the target even after an error. The target might 200 * not be a regular file, or its attributes might be important, 201 * or its contents might be irreplaceable. It would only be safe 202 * to remove it if we created it and its length is 0. 203 */ 204 205 if (pflag && setfile(fs, to_fd)) 206 rval = 1; 207 (void)close(from_fd); 208 if (close(to_fd)) { 209 warn("%s", to.p_path); 210 rval = 1; 211 } 212 return (rval); 213 } 214 215 int 216 copy_link(const FTSENT *p, int exists) 217 { 218 int len; 219 char llink[PATH_MAX]; 220 221 if ((len = readlink(p->fts_path, llink, sizeof(llink) - 1)) == -1) { 222 warn("readlink: %s", p->fts_path); 223 return (1); 224 } 225 llink[len] = '\0'; 226 if (exists && unlink(to.p_path)) { 227 warn("unlink: %s", to.p_path); 228 return (1); 229 } 230 if (symlink(llink, to.p_path)) { 231 warn("symlink: %s", llink); 232 return (1); 233 } 234 return (pflag ? setfile(p->fts_statp, -1) : 0); 235 } 236 237 int 238 copy_fifo(struct stat *from_stat, int exists) 239 { 240 if (exists && unlink(to.p_path)) { 241 warn("unlink: %s", to.p_path); 242 return (1); 243 } 244 if (mkfifo(to.p_path, from_stat->st_mode)) { 245 warn("mkfifo: %s", to.p_path); 246 return (1); 247 } 248 return (pflag ? setfile(from_stat, -1) : 0); 249 } 250 251 int 252 copy_special(struct stat *from_stat, int exists) 253 { 254 if (exists && unlink(to.p_path)) { 255 warn("unlink: %s", to.p_path); 256 return (1); 257 } 258 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 259 warn("mknod: %s", to.p_path); 260 return (1); 261 } 262 return (pflag ? setfile(from_stat, -1) : 0); 263 } 264 265 int 266 setfile(struct stat *fs, int fd) 267 { 268 static struct timeval tv[2]; 269 struct stat ts; 270 int rval, gotstat, islink, fdval; 271 272 rval = 0; 273 fdval = fd != -1; 274 islink = !fdval && S_ISLNK(fs->st_mode); 275 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | 276 S_IRWXU | S_IRWXG | S_IRWXO; 277 278 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 279 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 280 if (islink ? lutimes(to.p_path, tv) : utimes(to.p_path, tv)) { 281 warn("%sutimes: %s", islink ? "l" : "", to.p_path); 282 rval = 1; 283 } 284 if (fdval ? fstat(fd, &ts) : 285 (islink ? lstat(to.p_path, &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 (fdval ? fchown(fd, fs->st_uid, fs->st_gid) : 300 (islink ? lchown(to.p_path, fs->st_uid, fs->st_gid) : 301 chown(to.p_path, fs->st_uid, fs->st_gid))) { 302 if (errno != EPERM) { 303 warn("chown: %s", to.p_path); 304 rval = 1; 305 } 306 fs->st_mode &= ~(S_ISUID | S_ISGID); 307 } 308 309 if (!gotstat || fs->st_mode != ts.st_mode) 310 if (fdval ? fchmod(fd, fs->st_mode) : 311 (islink ? lchmod(to.p_path, fs->st_mode) : 312 chmod(to.p_path, fs->st_mode))) { 313 warn("chmod: %s", to.p_path); 314 rval = 1; 315 } 316 317 if (!gotstat || fs->st_flags != ts.st_flags) 318 if (fdval ? 319 fchflags(fd, fs->st_flags) : 320 (islink ? (errno = ENOSYS) : 321 chflags(to.p_path, fs->st_flags))) { 322 warn("chflags: %s", to.p_path); 323 rval = 1; 324 } 325 326 return (rval); 327 } 328 329 void 330 usage(void) 331 { 332 333 (void)fprintf(stderr, "%s\n%s\n", 334 "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src target", 335 " cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src1 ... srcN directory"); 336 exit(EX_USAGE); 337 } 338