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 #include <sys/param.h> 31 #include <sys/stat.h> 32 #include <sys/time.h> 33 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 34 #include <sys/mman.h> 35 #endif 36 37 #include <err.h> 38 #include <errno.h> 39 #include <fcntl.h> 40 #include <fts.h> 41 #include <limits.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <sysexits.h> 45 #include <unistd.h> 46 47 #include "extern.h" 48 49 #define cp_pct(x, y) ((y == 0) ? 0 : (int)(100.0 * (x) / (y))) 50 51 52 int 53 copy_file(const FTSENT *entp, int dne) 54 { 55 static char buf[MAXBSIZE]; 56 struct stat *fs; 57 ssize_t wcount, rcount; 58 size_t wresid; 59 off_t wtotal; 60 int ch, checkch, from_fd = 0, rval, to_fd = 0; 61 char *bufp; 62 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 63 char *p; 64 #endif 65 66 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 67 warn("%s", entp->fts_path); 68 return (1); 69 } 70 71 fs = entp->fts_statp; 72 73 /* 74 * If the file exists and we're interactive, verify with the user. 75 * If the file DNE, set the mode to be the from file, minus setuid 76 * bits, modified by the umask; arguably wrong, but it makes copying 77 * executables work right and it's been that way forever. (The 78 * other choice is 666 or'ed with the execute bits on the from file 79 * modified by the umask.) 80 */ 81 if (!dne) { 82 #define YESNO "(y/n [n]) " 83 if (nflag) { 84 if (vflag) 85 printf("%s not overwritten\n", to.p_path); 86 close(from_fd); 87 return (0); 88 } else if (iflag) { 89 fprintf(stderr, "overwrite %s? %s", 90 to.p_path, YESNO); 91 checkch = ch = getchar(); 92 while (ch != '\n' && ch != EOF) 93 ch = getchar(); 94 if (checkch != 'y' && checkch != 'Y') { 95 close(from_fd); 96 fprintf(stderr, "not overwritten\n"); 97 return (1); 98 } 99 } 100 101 if (fflag) { 102 /* remove existing destination file name, 103 * create a new file */ 104 unlink(to.p_path); 105 if (!lflag) 106 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 107 fs->st_mode & ~(S_ISUID | S_ISGID)); 108 } else { 109 if (!lflag) 110 /* overwrite existing destination file name */ 111 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 112 } 113 } else { 114 if (!lflag) 115 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 116 fs->st_mode & ~(S_ISUID | S_ISGID)); 117 } 118 119 if (to_fd == -1) { 120 warn("%s", to.p_path); 121 close(from_fd); 122 return (1); 123 } 124 125 rval = 0; 126 127 if (!lflag) { 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 * Some filesystems, such as smbnetfs, don't support mmap, 133 * so this is a best-effort attempt. 134 */ 135 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 136 if (S_ISREG(fs->st_mode) && fs->st_size > 0 && 137 fs->st_size <= 8 * 1024 * 1024 && 138 (p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 139 MAP_SHARED, from_fd, (off_t)0)) != MAP_FAILED) { 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 if (wcount <= 0) 145 break; 146 wtotal += wcount; 147 if (info) { 148 info = 0; 149 fprintf(stderr, 150 "%s -> %s %3d%%\n", 151 entp->fts_path, to.p_path, 152 cp_pct(wtotal, fs->st_size)); 153 } 154 if (wcount >= (ssize_t)wresid) 155 break; 156 } 157 if (wcount != (ssize_t)wresid) { 158 warn("%s", to.p_path); 159 rval = 1; 160 } 161 /* Some systems don't unmap on close(2). */ 162 if (munmap(p, fs->st_size) < 0) { 163 warn("%s", entp->fts_path); 164 rval = 1; 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 if (wcount <= 0) 175 break; 176 wtotal += wcount; 177 if (info) { 178 info = 0; 179 fprintf(stderr, 180 "%s -> %s %3d%%\n", 181 entp->fts_path, to.p_path, 182 cp_pct(wtotal, fs->st_size)); 183 } 184 if (wcount >= (ssize_t)wresid) 185 break; 186 } 187 if (wcount != (ssize_t)wresid) { 188 warn("%s", to.p_path); 189 rval = 1; 190 break; 191 } 192 } 193 if (rcount < 0) { 194 warn("%s", entp->fts_path); 195 rval = 1; 196 } 197 } 198 } else { 199 if (link(entp->fts_path, to.p_path)) { 200 warn("%s", to.p_path); 201 rval = 1; 202 } 203 } 204 205 /* 206 * Don't remove the target even after an error. The target might 207 * not be a regular file, or its attributes might be important, 208 * or its contents might be irreplaceable. It would only be safe 209 * to remove it if we created it and its length is 0. 210 */ 211 212 if (!lflag) { 213 if (pflag && setfile(fs, to_fd)) 214 rval = 1; 215 if (close(to_fd)) { 216 warn("%s", to.p_path); 217 rval = 1; 218 } 219 } 220 221 close(from_fd); 222 223 return (rval); 224 } 225 226 int 227 copy_link(const FTSENT *p, int exists) 228 { 229 int len; 230 char llink[PATH_MAX]; 231 232 if ((len = readlink(p->fts_path, llink, sizeof(llink) - 1)) == -1) { 233 warn("readlink: %s", p->fts_path); 234 return (1); 235 } 236 llink[len] = '\0'; 237 if (exists && unlink(to.p_path)) { 238 warn("unlink: %s", to.p_path); 239 return (1); 240 } 241 if (symlink(llink, to.p_path)) { 242 warn("symlink: %s", llink); 243 return (1); 244 } 245 return (pflag ? setfile(p->fts_statp, -1) : 0); 246 } 247 248 int 249 copy_fifo(struct stat *from_stat, int exists) 250 { 251 if (exists && unlink(to.p_path)) { 252 warn("unlink: %s", to.p_path); 253 return (1); 254 } 255 if (mkfifo(to.p_path, from_stat->st_mode)) { 256 warn("mkfifo: %s", to.p_path); 257 return (1); 258 } 259 return (pflag ? setfile(from_stat, -1) : 0); 260 } 261 262 int 263 copy_special(struct stat *from_stat, int exists) 264 { 265 if (exists && unlink(to.p_path)) { 266 warn("unlink: %s", to.p_path); 267 return (1); 268 } 269 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 270 warn("mknod: %s", to.p_path); 271 return (1); 272 } 273 return (pflag ? setfile(from_stat, -1) : 0); 274 } 275 276 int 277 setfile(struct stat *fs, int fd) 278 { 279 static struct timeval tv[2]; 280 struct stat ts; 281 int rval, gotstat, islink, fdval; 282 283 rval = 0; 284 fdval = fd != -1; 285 islink = !fdval && S_ISLNK(fs->st_mode); 286 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | 287 S_IRWXU | S_IRWXG | S_IRWXO; 288 289 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 290 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 291 if (islink ? lutimes(to.p_path, tv) : utimes(to.p_path, tv)) { 292 warn("%sutimes: %s", islink ? "l" : "", to.p_path); 293 rval = 1; 294 } 295 if (fdval ? fstat(fd, &ts) : 296 (islink ? lstat(to.p_path, &ts) : stat(to.p_path, &ts))) 297 gotstat = 0; 298 else { 299 gotstat = 1; 300 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX | 301 S_IRWXU | S_IRWXG | S_IRWXO; 302 } 303 /* 304 * Changing the ownership probably won't succeed, unless we're root 305 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 306 * the mode; current BSD behavior is to remove all setuid bits on 307 * chown. If chown fails, lose setuid/setgid bits. 308 */ 309 if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid) 310 if (fdval ? fchown(fd, fs->st_uid, fs->st_gid) : 311 (islink ? lchown(to.p_path, fs->st_uid, fs->st_gid) : 312 chown(to.p_path, fs->st_uid, fs->st_gid))) { 313 if (errno != EPERM) { 314 warn("chown: %s", to.p_path); 315 rval = 1; 316 } 317 fs->st_mode &= ~(S_ISUID | S_ISGID); 318 } 319 320 if (!gotstat || fs->st_mode != ts.st_mode) 321 if (fdval ? fchmod(fd, fs->st_mode) : 322 (islink ? lchmod(to.p_path, fs->st_mode) : 323 chmod(to.p_path, fs->st_mode))) { 324 warn("chmod: %s", to.p_path); 325 rval = 1; 326 } 327 328 if (!gotstat || fs->st_flags != ts.st_flags) 329 if (fdval ? 330 fchflags(fd, fs->st_flags) : 331 (islink ? lchflags(to.p_path, fs->st_flags) : 332 chflags(to.p_path, fs->st_flags))) { 333 warn("chflags: %s", to.p_path); 334 rval = 1; 335 } 336 337 return (rval); 338 } 339 340 void 341 usage(void) 342 { 343 344 fprintf(stderr, "%s\n%s\n", 345 "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-alpvx] source_file target_file", 346 " cp [-R [-H | -L | -P]] [-f | -i | -n] [-alpvx] source_file ... " 347 "target_directory"); 348 exit(EX_USAGE); 349 } 350