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 1.8 2005/02/28 23:15:35 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, rcount, rval, to_fd, wcount, wresid, 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 if (nflag) { 88 if (vflag) 89 printf("%s not overwritten\n", to.p_path); 90 close(from_fd); 91 return (0); 92 } else if (iflag) { 93 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 close(from_fd); 100 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 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 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 -= wcount) { 142 wcount = write(to_fd, bufp, wresid); 143 wtotal += wcount; 144 if (info) { 145 info = 0; 146 fprintf(stderr, 147 "%s -> %s %3d%%\n", 148 entp->fts_path, to.p_path, 149 cp_pct(wtotal, fs->st_size)); 150 } 151 if (wcount >= wresid || wcount <= 0) 152 break; 153 } 154 if (wcount != wresid) { 155 warn("%s", to.p_path); 156 rval = 1; 157 } 158 /* Some systems don't unmap on close(2). */ 159 if (munmap(p, fs->st_size) < 0) { 160 warn("%s", entp->fts_path); 161 rval = 1; 162 } 163 } 164 } else 165 #endif 166 { 167 wtotal = 0; 168 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 169 for (bufp = buf, wresid = rcount; ; 170 bufp += wcount, wresid -= wcount) { 171 wcount = write(to_fd, bufp, wresid); 172 wtotal += wcount; 173 if (info) { 174 info = 0; 175 fprintf(stderr, 176 "%s -> %s %3d%%\n", 177 entp->fts_path, to.p_path, 178 cp_pct(wtotal, fs->st_size)); 179 } 180 if (wcount >= wresid || wcount <= 0) 181 break; 182 } 183 if (wcount != wresid) { 184 warn("%s", to.p_path); 185 rval = 1; 186 break; 187 } 188 } 189 if (rcount < 0) { 190 warn("%s", entp->fts_path); 191 rval = 1; 192 } 193 } 194 195 /* 196 * Don't remove the target even after an error. The target might 197 * not be a regular file, or its attributes might be important, 198 * or its contents might be irreplaceable. It would only be safe 199 * to remove it if we created it and its length is 0. 200 */ 201 202 if (pflag && setfile(fs, to_fd)) 203 rval = 1; 204 close(from_fd); 205 if (close(to_fd)) { 206 warn("%s", to.p_path); 207 rval = 1; 208 } 209 return (rval); 210 } 211 212 int 213 copy_link(const FTSENT *p, int exists) 214 { 215 int len; 216 char linkname[PATH_MAX]; 217 218 if ((len = readlink(p->fts_path, linkname, sizeof(linkname) - 1)) == -1) { 219 warn("readlink: %s", p->fts_path); 220 return (1); 221 } 222 linkname[len] = '\0'; 223 if (exists && unlink(to.p_path)) { 224 warn("unlink: %s", to.p_path); 225 return (1); 226 } 227 if (symlink(linkname, to.p_path)) { 228 warn("symlink: %s", linkname); 229 return (1); 230 } 231 return (pflag ? setfile(p->fts_statp, -1) : 0); 232 } 233 234 int 235 copy_fifo(struct stat *from_stat, int exists) 236 { 237 if (exists && unlink(to.p_path)) { 238 warn("unlink: %s", to.p_path); 239 return (1); 240 } 241 if (mkfifo(to.p_path, from_stat->st_mode)) { 242 warn("mkfifo: %s", to.p_path); 243 return (1); 244 } 245 return (pflag ? setfile(from_stat, -1) : 0); 246 } 247 248 int 249 copy_special(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 (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 256 warn("mknod: %s", to.p_path); 257 return (1); 258 } 259 return (pflag ? setfile(from_stat, -1) : 0); 260 } 261 262 int 263 setfile(struct stat *fs, int fd) 264 { 265 static struct timeval tv[2]; 266 struct stat ts; 267 int rval, gotstat, islink, fdval; 268 269 rval = 0; 270 fdval = fd != -1; 271 islink = !fdval && S_ISLNK(fs->st_mode); 272 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | 273 S_IRWXU | S_IRWXG | S_IRWXO; 274 275 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 276 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 277 if (islink ? lutimes(to.p_path, tv) : utimes(to.p_path, tv)) { 278 warn("%sutimes: %s", islink ? "l" : "", to.p_path); 279 rval = 1; 280 } 281 if (fdval ? fstat(fd, &ts) : 282 (islink ? lstat(to.p_path, &ts) : stat(to.p_path, &ts))) { 283 gotstat = 0; 284 } else { 285 gotstat = 1; 286 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX | 287 S_IRWXU | S_IRWXG | S_IRWXO; 288 } 289 /* 290 * Changing the ownership probably won't succeed, unless we're root 291 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 292 * the mode; current BSD behavior is to remove all setuid bits on 293 * chown. If chown fails, lose setuid/setgid bits. 294 */ 295 if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid) 296 if (fdval ? fchown(fd, fs->st_uid, fs->st_gid) : 297 (islink ? lchown(to.p_path, fs->st_uid, fs->st_gid) : 298 chown(to.p_path, fs->st_uid, fs->st_gid))) { 299 if (errno != EPERM) { 300 warn("chown: %s", to.p_path); 301 rval = 1; 302 } 303 fs->st_mode &= ~(S_ISUID | S_ISGID); 304 } 305 306 if (!gotstat || fs->st_mode != ts.st_mode) 307 if (fdval ? fchmod(fd, fs->st_mode) : 308 (islink ? lchmod(to.p_path, fs->st_mode) : 309 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 (fdval ? 316 fchflags(fd, fs->st_flags) : 317 (islink ? (errno = ENOSYS) : 318 chflags(to.p_path, fs->st_flags))) { 319 warn("chflags: %s", to.p_path); 320 rval = 1; 321 } 322 323 return (rval); 324 } 325 326 void 327 usage(void) 328 { 329 fprintf(stderr, "%s\n%s\n", 330 "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] source_file target_file", 331 " cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] source_file ... " 332 "target_directory"); 333 exit(EX_USAGE); 334 } 335