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 <sysexits.h> 54 #include <unistd.h> 55 56 #include "extern.h" 57 58 int 59 copy_file(entp, dne) 60 FTSENT *entp; 61 int dne; 62 { 63 static char buf[MAXBSIZE]; 64 struct stat to_stat, *fs; 65 int ch, checkch, from_fd, rcount, rval, to_fd, wcount, wresid; 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 #define YESNO "(y/n [n]) " 88 if (iflag) { 89 (void)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 (void)close(from_fd); 96 (void)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 (void)unlink(to.p_path); 105 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 106 fs->st_mode & ~(S_ISUID | S_ISGID)); 107 } else 108 /* overwrite existing destination file name */ 109 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 110 } else 111 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 112 fs->st_mode & ~(S_ISUID | S_ISGID)); 113 114 if (to_fd == -1) { 115 warn("%s", to.p_path); 116 (void)close(from_fd); 117 return (1);; 118 } 119 120 rval = 0; 121 122 /* 123 * Mmap and write if less than 8M (the limit is so we don't totally 124 * trash memory on big files. This is really a minor hack, but it 125 * wins some CPU back. 126 */ 127 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 128 if (S_ISREG(fs->st_mode) && fs->st_size <= 8 * 1048576) { 129 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 130 MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) { 131 warn("%s", entp->fts_path); 132 rval = 1; 133 } else { 134 for (bufp = p, wresid = fs->st_size; ; 135 bufp += wcount, wresid -= wcount) { 136 wcount = write(to_fd, bufp, wresid); 137 if (wcount >= wresid || wcount <= 0) 138 break; 139 } 140 if (wcount != wresid) { 141 warn("%s", to.p_path); 142 rval = 1; 143 } 144 /* Some systems don't unmap on close(2). */ 145 if (munmap(p, fs->st_size) < 0) { 146 warn("%s", entp->fts_path); 147 rval = 1; 148 } 149 } 150 } else 151 #endif 152 { 153 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 154 for (bufp = buf, wresid = rcount; ; 155 bufp += wcount, wresid -= wcount) { 156 wcount = write(to_fd, bufp, wresid); 157 if (wcount >= wresid || wcount <= 0) 158 break; 159 } 160 if (wcount != wresid) { 161 warn("%s", to.p_path); 162 rval = 1; 163 break; 164 } 165 } 166 if (rcount < 0) { 167 warn("%s", entp->fts_path); 168 rval = 1; 169 } 170 } 171 172 /* 173 * Don't remove the target even after an error. The target might 174 * not be a regular file, or its attributes might be important, 175 * or its contents might be irreplaceable. It would only be safe 176 * to remove it if we created it and its length is 0. 177 */ 178 179 if (pflag && setfile(fs, to_fd)) 180 rval = 1; 181 /* 182 * If the source was setuid or setgid, lose the bits unless the 183 * copy is owned by the same user and group. 184 */ 185 #define RETAINBITS \ 186 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 187 else if (fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) { 188 if (fstat(to_fd, &to_stat)) { 189 warn("%s", to.p_path); 190 rval = 1; 191 } else if (fs->st_gid == to_stat.st_gid && 192 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) { 193 warn("%s", to.p_path); 194 rval = 1; 195 } 196 } 197 (void)close(from_fd); 198 if (close(to_fd)) { 199 warn("%s", to.p_path); 200 rval = 1; 201 } 202 return (rval); 203 } 204 205 int 206 copy_link(p, exists) 207 FTSENT *p; 208 int exists; 209 { 210 int len; 211 char link[MAXPATHLEN]; 212 213 if ((len = readlink(p->fts_path, link, sizeof(link) - 1)) == -1) { 214 warn("readlink: %s", p->fts_path); 215 return (1); 216 } 217 link[len] = '\0'; 218 if (exists && unlink(to.p_path)) { 219 warn("unlink: %s", to.p_path); 220 return (1); 221 } 222 if (symlink(link, to.p_path)) { 223 warn("symlink: %s", link); 224 return (1); 225 } 226 return (0); 227 } 228 229 int 230 copy_fifo(from_stat, exists) 231 struct stat *from_stat; 232 int exists; 233 { 234 if (exists && unlink(to.p_path)) { 235 warn("unlink: %s", to.p_path); 236 return (1); 237 } 238 if (mkfifo(to.p_path, from_stat->st_mode)) { 239 warn("mkfifo: %s", to.p_path); 240 return (1); 241 } 242 return (pflag ? setfile(from_stat, 0) : 0); 243 } 244 245 int 246 copy_special(from_stat, exists) 247 struct stat *from_stat; 248 int exists; 249 { 250 if (exists && unlink(to.p_path)) { 251 warn("unlink: %s", to.p_path); 252 return (1); 253 } 254 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 255 warn("mknod: %s", to.p_path); 256 return (1); 257 } 258 return (pflag ? setfile(from_stat, 0) : 0); 259 } 260 261 262 int 263 setfile(fs, fd) 264 register struct stat *fs; 265 int fd; 266 { 267 static struct timeval tv[2]; 268 struct stat ts; 269 int rval; 270 int gotstat; 271 272 rval = 0; 273 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | 274 S_IRWXU | S_IRWXG | S_IRWXO; 275 276 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 277 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 278 if (utimes(to.p_path, tv)) { 279 warn("utimes: %s", to.p_path); 280 rval = 1; 281 } 282 if (fd ? fstat(fd, &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 (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 297 chown(to.p_path, fs->st_uid, fs->st_gid)) { 298 if (errno != EPERM) { 299 warn("chown: %s", to.p_path); 300 rval = 1; 301 } 302 fs->st_mode &= ~(S_ISUID | S_ISGID); 303 } 304 305 if (!gotstat || fs->st_mode != ts.st_mode) 306 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) { 307 warn("chown: %s", to.p_path); 308 rval = 1; 309 } 310 311 if (!gotstat || fs->st_flags != ts.st_flags) 312 if (fd ? 313 fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) { 314 warn("chflags: %s", to.p_path); 315 rval = 1; 316 } 317 318 return (rval); 319 } 320 321 void 322 usage() 323 { 324 325 (void)fprintf(stderr, "%s\n%s\n", 326 "usage: cp [-R [-H | -L | -P]] [-f | -i] [-pv] src target", 327 " cp [-R [-H | -L | -P]] [-f | -i] [-pv] src1 ... srcN directory"); 328 exit(EX_USAGE); 329 } 330