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 * @(#)utils.c 8.3 (Berkeley) 4/1/94 34 * $FreeBSD: src/bin/cp/utils.c,v 1.45 2005/02/09 17:37:37 ru Exp $ 35 * $DragonFly: src/bin/cp/utils.c,v 1.11 2007/06/15 07:02:51 corecode Exp $ 36 */ 37 38 #include <sys/param.h> 39 #include <sys/stat.h> 40 #include <sys/time.h> 41 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 42 #include <sys/mman.h> 43 #endif 44 45 #include <err.h> 46 #include <errno.h> 47 #include <fcntl.h> 48 #include <fts.h> 49 #include <limits.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <sysexits.h> 53 #include <unistd.h> 54 55 #include "extern.h" 56 #define cp_pct(x,y) (int)(100.0 * (double)(x) / (double)(y)) 57 58 #define YESNO "(y/n [n]) " 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, rval, to_fd; 66 size_t rcount, wcount, wresid; 67 off_t wtotal; 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 if (nflag) { 90 if (vflag) 91 printf("%s not overwritten\n", to.p_path); 92 close(from_fd); 93 return (0); 94 } else if (iflag) { 95 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 close(from_fd); 102 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 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 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 > 0 && 135 fs->st_size <= 8 * 1048576) { 136 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 137 MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) { 138 warn("%s", entp->fts_path); 139 rval = 1; 140 } else { 141 wtotal = 0; 142 for (bufp = p, wresid = fs->st_size; ; 143 bufp += wcount, wresid -= wcount) { 144 wcount = write(to_fd, bufp, wresid); 145 if ((ssize_t)wcount == -1) 146 break; 147 wtotal += wcount; 148 if (info) { 149 info = 0; 150 fprintf(stderr, 151 "%s -> %s %3d%%\n", 152 entp->fts_path, to.p_path, 153 cp_pct(wtotal, fs->st_size)); 154 } 155 if (wcount >= wresid || wcount == 0) 156 break; 157 } 158 if (wcount != 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 ((ssize_t)(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 if ((ssize_t)wcount == -1) 177 break; 178 wtotal += wcount; 179 if (info) { 180 info = 0; 181 fprintf(stderr, 182 "%s -> %s %3d%%\n", 183 entp->fts_path, to.p_path, 184 cp_pct(wtotal, fs->st_size)); 185 } 186 if (wcount >= wresid || wcount == 0) 187 break; 188 } 189 if (wcount != wresid) { 190 warn("%s", to.p_path); 191 rval = 1; 192 break; 193 } 194 } 195 if ((ssize_t)rcount == -1) { 196 warn("%s", entp->fts_path); 197 rval = 1; 198 } 199 } 200 201 /* 202 * Don't remove the target even after an error. The target might 203 * not be a regular file, or its attributes might be important, 204 * or its contents might be irreplaceable. It would only be safe 205 * to remove it if we created it and its length is 0. 206 */ 207 208 if (pflag && setfile(fs, to_fd)) 209 rval = 1; 210 close(from_fd); 211 if (close(to_fd)) { 212 warn("%s", to.p_path); 213 rval = 1; 214 } 215 return (rval); 216 } 217 218 int 219 copy_link(const FTSENT *p, int exists) 220 { 221 int len; 222 char linkname[PATH_MAX]; 223 224 if ((len = readlink(p->fts_path, linkname, sizeof(linkname) - 1)) == -1) { 225 warn("readlink: %s", p->fts_path); 226 return (1); 227 } 228 linkname[len] = '\0'; 229 if (exists && unlink(to.p_path)) { 230 warn("unlink: %s", to.p_path); 231 return (1); 232 } 233 if (symlink(linkname, to.p_path)) { 234 warn("symlink: %s", linkname); 235 return (1); 236 } 237 return (pflag ? setfile(p->fts_statp, -1) : 0); 238 } 239 240 int 241 copy_fifo(struct stat *from_stat, int exists) 242 { 243 if (exists && unlink(to.p_path)) { 244 warn("unlink: %s", to.p_path); 245 return (1); 246 } 247 if (mkfifo(to.p_path, from_stat->st_mode)) { 248 warn("mkfifo: %s", to.p_path); 249 return (1); 250 } 251 return (pflag ? setfile(from_stat, -1) : 0); 252 } 253 254 int 255 copy_special(struct stat *from_stat, int exists) 256 { 257 if (exists && unlink(to.p_path)) { 258 warn("unlink: %s", to.p_path); 259 return (1); 260 } 261 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 262 warn("mknod: %s", to.p_path); 263 return (1); 264 } 265 return (pflag ? setfile(from_stat, -1) : 0); 266 } 267 268 int 269 setfile(struct stat *fs, int fd) 270 { 271 static struct timeval tv[2]; 272 struct stat ts; 273 int rval, gotstat, islink, fdval; 274 275 rval = 0; 276 fdval = fd != -1; 277 islink = !fdval && S_ISLNK(fs->st_mode); 278 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | 279 S_IRWXU | S_IRWXG | S_IRWXO; 280 281 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 282 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 283 if (islink ? lutimes(to.p_path, tv) : utimes(to.p_path, tv)) { 284 warn("%sutimes: %s", islink ? "l" : "", to.p_path); 285 rval = 1; 286 } 287 if (fdval ? fstat(fd, &ts) : 288 (islink ? lstat(to.p_path, &ts) : stat(to.p_path, &ts))) { 289 gotstat = 0; 290 } else { 291 gotstat = 1; 292 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX | 293 S_IRWXU | S_IRWXG | S_IRWXO; 294 } 295 /* 296 * Changing the ownership probably won't succeed, unless we're root 297 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 298 * the mode; current BSD behavior is to remove all setuid bits on 299 * chown. If chown fails, lose setuid/setgid bits. 300 */ 301 if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid) 302 if (fdval ? fchown(fd, fs->st_uid, fs->st_gid) : 303 (islink ? lchown(to.p_path, fs->st_uid, fs->st_gid) : 304 chown(to.p_path, fs->st_uid, fs->st_gid))) { 305 if (errno != EPERM) { 306 warn("chown: %s", to.p_path); 307 rval = 1; 308 } 309 fs->st_mode &= ~(S_ISUID | S_ISGID); 310 } 311 312 if (!gotstat || fs->st_mode != ts.st_mode) 313 if (fdval ? fchmod(fd, fs->st_mode) : 314 (islink ? lchmod(to.p_path, fs->st_mode) : 315 chmod(to.p_path, fs->st_mode))) { 316 warn("chmod: %s", to.p_path); 317 rval = 1; 318 } 319 320 if (!gotstat || fs->st_flags != ts.st_flags) 321 if (fdval ? 322 fchflags(fd, fs->st_flags) : 323 (islink ? (errno = ENOSYS) : 324 chflags(to.p_path, fs->st_flags))) { 325 warn("chflags: %s", to.p_path); 326 rval = 1; 327 } 328 329 return (rval); 330 } 331 332 void 333 usage(void) 334 { 335 fprintf(stderr, "%s\n%s\n", 336 "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] source_file target_file", 337 " cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] source_file ... " 338 "target_directory"); 339 exit(EX_USAGE); 340 } 341