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 1.27.2.6 2002/08/10 13:20:19 johan Exp $ 35 * $DragonFly: src/bin/cp/utils.c,v 1.2 2003/06/17 04:22:49 dillon 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 57 int 58 copy_file(entp, dne) 59 FTSENT *entp; 60 int dne; 61 { 62 static char buf[MAXBSIZE]; 63 struct stat *fs; 64 int ch, checkch, from_fd, rcount, rval, to_fd, wcount, wresid; 65 char *bufp; 66 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 67 char *p; 68 #endif 69 70 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 71 warn("%s", entp->fts_path); 72 return (1); 73 } 74 75 fs = entp->fts_statp; 76 77 /* 78 * If the file exists and we're interactive, verify with the user. 79 * If the file DNE, set the mode to be the from file, minus setuid 80 * bits, modified by the umask; arguably wrong, but it makes copying 81 * executables work right and it's been that way forever. (The 82 * other choice is 666 or'ed with the execute bits on the from file 83 * modified by the umask.) 84 */ 85 if (!dne) { 86 #define YESNO "(y/n [n]) " 87 if (nflag) { 88 if (vflag) 89 printf("%s not overwritten\n", to.p_path); 90 return (0); 91 } else if (iflag) { 92 (void)fprintf(stderr, "overwrite %s? %s", 93 to.p_path, YESNO); 94 checkch = ch = getchar(); 95 while (ch != '\n' && ch != EOF) 96 ch = getchar(); 97 if (checkch != 'y' && checkch != 'Y') { 98 (void)close(from_fd); 99 (void)fprintf(stderr, "not overwritten\n"); 100 return (1); 101 } 102 } 103 104 if (fflag) { 105 /* remove existing destination file name, 106 * create a new file */ 107 (void)unlink(to.p_path); 108 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 109 fs->st_mode & ~(S_ISUID | S_ISGID)); 110 } else 111 /* overwrite existing destination file name */ 112 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 113 } else 114 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 115 fs->st_mode & ~(S_ISUID | S_ISGID)); 116 117 if (to_fd == -1) { 118 warn("%s", to.p_path); 119 (void)close(from_fd); 120 return (1);; 121 } 122 123 rval = 0; 124 125 /* 126 * Mmap and write if less than 8M (the limit is so we don't totally 127 * trash memory on big files. This is really a minor hack, but it 128 * wins some CPU back. 129 */ 130 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 131 if (S_ISREG(fs->st_mode) && fs->st_size <= 8 * 1048576) { 132 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 133 MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) { 134 warn("%s", entp->fts_path); 135 rval = 1; 136 } else { 137 for (bufp = p, wresid = fs->st_size; ; 138 bufp += wcount, wresid -= wcount) { 139 wcount = write(to_fd, bufp, wresid); 140 if (wcount >= wresid || wcount <= 0) 141 break; 142 } 143 if (wcount != wresid) { 144 warn("%s", to.p_path); 145 rval = 1; 146 } 147 /* Some systems don't unmap on close(2). */ 148 if (munmap(p, fs->st_size) < 0) { 149 warn("%s", entp->fts_path); 150 rval = 1; 151 } 152 } 153 } else 154 #endif 155 { 156 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 157 for (bufp = buf, wresid = rcount; ; 158 bufp += wcount, wresid -= wcount) { 159 wcount = write(to_fd, bufp, wresid); 160 if (wcount >= wresid || wcount <= 0) 161 break; 162 } 163 if (wcount != wresid) { 164 warn("%s", to.p_path); 165 rval = 1; 166 break; 167 } 168 } 169 if (rcount < 0) { 170 warn("%s", entp->fts_path); 171 rval = 1; 172 } 173 } 174 175 /* 176 * Don't remove the target even after an error. The target might 177 * not be a regular file, or its attributes might be important, 178 * or its contents might be irreplaceable. It would only be safe 179 * to remove it if we created it and its length is 0. 180 */ 181 182 if (pflag && setfile(fs, to_fd)) 183 rval = 1; 184 (void)close(from_fd); 185 if (close(to_fd)) { 186 warn("%s", to.p_path); 187 rval = 1; 188 } 189 return (rval); 190 } 191 192 int 193 copy_link(p, exists) 194 FTSENT *p; 195 int exists; 196 { 197 int len; 198 char link[PATH_MAX]; 199 200 if ((len = readlink(p->fts_path, link, sizeof(link) - 1)) == -1) { 201 warn("readlink: %s", p->fts_path); 202 return (1); 203 } 204 link[len] = '\0'; 205 if (exists && unlink(to.p_path)) { 206 warn("unlink: %s", to.p_path); 207 return (1); 208 } 209 if (symlink(link, to.p_path)) { 210 warn("symlink: %s", link); 211 return (1); 212 } 213 return (0); 214 } 215 216 int 217 copy_fifo(from_stat, exists) 218 struct stat *from_stat; 219 int exists; 220 { 221 if (exists && unlink(to.p_path)) { 222 warn("unlink: %s", to.p_path); 223 return (1); 224 } 225 if (mkfifo(to.p_path, from_stat->st_mode)) { 226 warn("mkfifo: %s", to.p_path); 227 return (1); 228 } 229 return (pflag ? setfile(from_stat, 0) : 0); 230 } 231 232 int 233 copy_special(from_stat, exists) 234 struct stat *from_stat; 235 int exists; 236 { 237 if (exists && unlink(to.p_path)) { 238 warn("unlink: %s", to.p_path); 239 return (1); 240 } 241 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 242 warn("mknod: %s", to.p_path); 243 return (1); 244 } 245 return (pflag ? setfile(from_stat, 0) : 0); 246 } 247 248 #define RETAINBITS \ 249 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 250 251 int 252 setfile(fs, fd) 253 register struct stat *fs; 254 int fd; 255 { 256 static struct timeval tv[2]; 257 struct stat ts; 258 int rval; 259 int gotstat; 260 261 rval = 0; 262 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | 263 S_IRWXU | S_IRWXG | S_IRWXO; 264 265 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 266 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 267 if (utimes(to.p_path, tv)) { 268 warn("utimes: %s", to.p_path); 269 rval = 1; 270 } 271 if (fd ? fstat(fd, &ts) : stat(to.p_path, &ts)) 272 gotstat = 0; 273 else { 274 gotstat = 1; 275 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX | 276 S_IRWXU | S_IRWXG | S_IRWXO; 277 } 278 /* 279 * Changing the ownership probably won't succeed, unless we're root 280 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 281 * the mode; current BSD behavior is to remove all setuid bits on 282 * chown. If chown fails, lose setuid/setgid bits. 283 */ 284 if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid) 285 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 286 chown(to.p_path, fs->st_uid, fs->st_gid)) { 287 if (errno != EPERM) { 288 warn("chown: %s", to.p_path); 289 rval = 1; 290 } 291 fs->st_mode &= ~(S_ISUID | S_ISGID); 292 } 293 294 if (!gotstat || fs->st_mode != ts.st_mode) 295 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) { 296 warn("chmod: %s", to.p_path); 297 rval = 1; 298 } 299 300 if (!gotstat || fs->st_flags != ts.st_flags) 301 if (fd ? 302 fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) { 303 warn("chflags: %s", to.p_path); 304 rval = 1; 305 } 306 307 return (rval); 308 } 309 310 void 311 usage() 312 { 313 314 (void)fprintf(stderr, "%s\n%s\n", 315 "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src target", 316 " cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] src1 ... srcN directory"); 317 exit(EX_USAGE); 318 } 319