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 34 #ifndef lint 35 #if 0 36 static char sccsid[] = "@(#)utils.c 8.3 (Berkeley) 4/1/94"; 37 #endif 38 static const char rcsid[] = 39 "$FreeBSD$"; 40 #endif /* not lint */ 41 42 #include <sys/param.h> 43 #include <sys/stat.h> 44 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 45 #include <sys/mman.h> 46 #endif 47 48 #include <err.h> 49 #include <errno.h> 50 #include <fcntl.h> 51 #include <fts.h> 52 #include <stdio.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 to_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 (iflag) { 88 (void)fprintf(stderr, "overwrite %s? %s", 89 to.p_path, YESNO); 90 checkch = ch = getchar(); 91 while (ch != '\n' && ch != EOF) 92 ch = getchar(); 93 if (checkch != 'y' && checkch != 'Y') { 94 (void)close(from_fd); 95 (void)fprintf(stderr, "not overwritten\n"); 96 return (0); 97 } 98 } 99 100 if (fflag) { 101 /* remove existing destination file name, 102 * create a new file */ 103 (void)unlink(to.p_path); 104 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 105 fs->st_mode & ~(S_ISUID | S_ISGID)); 106 } else 107 /* overwrite existing destination file name */ 108 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 109 } else 110 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 111 fs->st_mode & ~(S_ISUID | S_ISGID)); 112 113 if (to_fd == -1) { 114 warn("%s", to.p_path); 115 (void)close(from_fd); 116 return (1);; 117 } 118 119 rval = 0; 120 121 if (vflag) 122 printf("%s -> %s\n",entp->fts_path, to.p_path); 123 124 /* 125 * Mmap and write if less than 8M (the limit is so we don't totally 126 * trash memory on big files. This is really a minor hack, but it 127 * wins some CPU back. 128 */ 129 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 130 if (S_ISREG(fs->st_mode) && fs->st_size <= 8 * 1048576) { 131 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 132 MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) { 133 warn("%s", entp->fts_path); 134 rval = 1; 135 } else { 136 for (bufp = p, wresid = fs->st_size; ; 137 bufp += wcount, wresid -= wcount) { 138 wcount = write(to_fd, bufp, wresid); 139 if (wcount >= wresid || wcount <= 0) 140 break; 141 } 142 if (wcount != wresid) { 143 warn("%s", to.p_path); 144 rval = 1; 145 } 146 /* Some systems don't unmap on close(2). */ 147 if (munmap(p, fs->st_size) < 0) { 148 warn("%s", entp->fts_path); 149 rval = 1; 150 } 151 } 152 } else 153 #endif 154 { 155 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 156 for (bufp = buf, wresid = rcount; ; 157 bufp += wcount, wresid -= wcount) { 158 wcount = write(to_fd, bufp, wresid); 159 if (wcount >= wresid || wcount <= 0) 160 break; 161 } 162 if (wcount != wresid) { 163 warn("%s", to.p_path); 164 rval = 1; 165 break; 166 } 167 } 168 if (rcount < 0) { 169 warn("%s", entp->fts_path); 170 rval = 1; 171 } 172 } 173 174 /* 175 * Don't remove the target even after an error. The target might 176 * not be a regular file, or its attributes might be important, 177 * or its contents might be irreplaceable. It would only be safe 178 * to remove it if we created it and its length is 0. 179 */ 180 181 if (pflag && setfile(fs, to_fd)) 182 rval = 1; 183 /* 184 * If the source was setuid or setgid, lose the bits unless the 185 * copy is owned by the same user and group. 186 */ 187 #define RETAINBITS \ 188 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 189 else if (fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) { 190 if (fstat(to_fd, &to_stat)) { 191 warn("%s", to.p_path); 192 rval = 1; 193 } else if (fs->st_gid == to_stat.st_gid && 194 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) { 195 warn("%s", to.p_path); 196 rval = 1; 197 } 198 } 199 (void)close(from_fd); 200 if (close(to_fd)) { 201 warn("%s", to.p_path); 202 rval = 1; 203 } 204 return (rval); 205 } 206 207 int 208 copy_link(p, exists) 209 FTSENT *p; 210 int exists; 211 { 212 int len; 213 char link[MAXPATHLEN]; 214 215 if ((len = readlink(p->fts_path, link, sizeof(link) - 1)) == -1) { 216 warn("readlink: %s", p->fts_path); 217 return (1); 218 } 219 link[len] = '\0'; 220 if (exists && unlink(to.p_path)) { 221 warn("unlink: %s", to.p_path); 222 return (1); 223 } 224 if (symlink(link, to.p_path)) { 225 warn("symlink: %s", link); 226 return (1); 227 } 228 return (0); 229 } 230 231 int 232 copy_fifo(from_stat, exists) 233 struct stat *from_stat; 234 int exists; 235 { 236 if (exists && unlink(to.p_path)) { 237 warn("unlink: %s", to.p_path); 238 return (1); 239 } 240 if (mkfifo(to.p_path, from_stat->st_mode)) { 241 warn("mkfifo: %s", to.p_path); 242 return (1); 243 } 244 return (pflag ? setfile(from_stat, 0) : 0); 245 } 246 247 int 248 copy_special(from_stat, exists) 249 struct stat *from_stat; 250 int exists; 251 { 252 if (exists && unlink(to.p_path)) { 253 warn("unlink: %s", to.p_path); 254 return (1); 255 } 256 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 257 warn("mknod: %s", to.p_path); 258 return (1); 259 } 260 return (pflag ? setfile(from_stat, 0) : 0); 261 } 262 263 264 int 265 setfile(fs, fd) 266 register struct stat *fs; 267 int fd; 268 { 269 static struct timeval tv[2]; 270 struct stat ts; 271 int rval; 272 int gotstat; 273 274 rval = 0; 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 (utimes(to.p_path, tv)) { 281 warn("utimes: %s", to.p_path); 282 rval = 1; 283 } 284 if (fd ? fstat(fd, &ts) : stat(to.p_path, &ts)) 285 gotstat = 0; 286 else { 287 gotstat = 1; 288 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX | 289 S_IRWXU | S_IRWXG | S_IRWXO; 290 } 291 /* 292 * Changing the ownership probably won't succeed, unless we're root 293 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 294 * the mode; current BSD behavior is to remove all setuid bits on 295 * chown. If chown fails, lose setuid/setgid bits. 296 */ 297 if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid) 298 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 299 chown(to.p_path, fs->st_uid, fs->st_gid)) { 300 if (errno != EPERM) { 301 warn("chown: %s", to.p_path); 302 rval = 1; 303 } 304 fs->st_mode &= ~(S_ISUID | S_ISGID); 305 } 306 307 if (!gotstat || fs->st_mode != ts.st_mode) 308 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) { 309 warn("chown: %s", to.p_path); 310 rval = 1; 311 } 312 313 if (!gotstat || fs->st_flags != ts.st_flags) 314 if (fd ? 315 fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) { 316 warn("chflags: %s", to.p_path); 317 rval = 1; 318 } 319 320 return (rval); 321 } 322 323 void 324 usage() 325 { 326 (void)fprintf(stderr, "%s\n%s\n", 327 "usage: cp [-R [-H | -L | -P]] [-f | -i] [-p] [-v] src target", 328 " cp [-R [-H | -L | -P]] [-f | -i] [-p] [-v] src1 ... srcN directory"); 329 exit(1); 330 } 331