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 "$Id: utils.c,v 1.19 1998/06/09 03:38:26 imp Exp $"; 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 /* 122 * Mmap and write if less than 8M (the limit is so we don't totally 123 * trash memory on big files. This is really a minor hack, but it 124 * wins some CPU back. 125 */ 126 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 127 if (fs->st_size <= 8 * 1048576) { 128 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 129 MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) { 130 warn("%s", entp->fts_path); 131 rval = 1; 132 } else { 133 for (bufp = p, wresid = fs->st_size; ; 134 bufp += wcount, wresid -= wcount) { 135 wcount = write(to_fd, bufp, wresid); 136 if (wcount >= wresid || wcount <= 0) 137 break; 138 } 139 if (wcount != wresid) { 140 warn("%s", to.p_path); 141 rval = 1; 142 } 143 /* Some systems don't unmap on close(2). */ 144 if (munmap(p, fs->st_size) < 0) { 145 warn("%s", entp->fts_path); 146 rval = 1; 147 } 148 } 149 } else 150 #endif 151 { 152 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 153 for (bufp = buf, wresid = rcount; ; 154 bufp += wcount, wresid -= wcount) { 155 wcount = write(to_fd, bufp, wresid); 156 if (wcount >= wresid || wcount <= 0) 157 break; 158 } 159 if (wcount != wresid) { 160 warn("%s", to.p_path); 161 rval = 1; 162 break; 163 } 164 } 165 if (rcount < 0) { 166 warn("%s", entp->fts_path); 167 rval = 1; 168 } 169 } 170 171 /* 172 * Don't remove the target even after an error. The target might 173 * not be a regular file, or its attributes might be important, 174 * or its contents might be irreplacable. It would only be safe 175 * to remove it if we created it and its length is 0. 176 */ 177 178 if (pflag && setfile(fs, to_fd)) 179 rval = 1; 180 /* 181 * If the source was setuid or setgid, lose the bits unless the 182 * copy is owned by the same user and group. 183 */ 184 #define RETAINBITS \ 185 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 186 else if (fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) 187 if (fstat(to_fd, &to_stat)) { 188 warn("%s", to.p_path); 189 rval = 1; 190 } else if (fs->st_gid == to_stat.st_gid && 191 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) { 192 warn("%s", to.p_path); 193 rval = 1; 194 } 195 (void)close(from_fd); 196 if (close(to_fd)) { 197 warn("%s", to.p_path); 198 rval = 1; 199 } 200 return (rval); 201 } 202 203 int 204 copy_link(p, exists) 205 FTSENT *p; 206 int exists; 207 { 208 int len; 209 char link[MAXPATHLEN]; 210 211 if ((len = readlink(p->fts_path, link, sizeof(link) - 1)) == -1) { 212 warn("readlink: %s", p->fts_path); 213 return (1); 214 } 215 link[len] = '\0'; 216 if (exists && unlink(to.p_path)) { 217 warn("unlink: %s", to.p_path); 218 return (1); 219 } 220 if (symlink(link, to.p_path)) { 221 warn("symlink: %s", link); 222 return (1); 223 } 224 return (0); 225 } 226 227 int 228 copy_fifo(from_stat, exists) 229 struct stat *from_stat; 230 int exists; 231 { 232 if (exists && unlink(to.p_path)) { 233 warn("unlink: %s", to.p_path); 234 return (1); 235 } 236 if (mkfifo(to.p_path, from_stat->st_mode)) { 237 warn("mkfifo: %s", to.p_path); 238 return (1); 239 } 240 return (pflag ? setfile(from_stat, 0) : 0); 241 } 242 243 int 244 copy_special(from_stat, exists) 245 struct stat *from_stat; 246 int exists; 247 { 248 if (exists && unlink(to.p_path)) { 249 warn("unlink: %s", to.p_path); 250 return (1); 251 } 252 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 253 warn("mknod: %s", to.p_path); 254 return (1); 255 } 256 return (pflag ? setfile(from_stat, 0) : 0); 257 } 258 259 260 int 261 setfile(fs, fd) 262 register struct stat *fs; 263 int fd; 264 { 265 static struct timeval tv[2]; 266 struct stat ts; 267 int rval; 268 int gotstat; 269 270 rval = 0; 271 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | 272 S_IRWXU | S_IRWXG | S_IRWXO; 273 274 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 275 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 276 if (utimes(to.p_path, tv)) { 277 warn("utimes: %s", to.p_path); 278 rval = 1; 279 } 280 if (fd ? fstat(fd, &ts) : stat(to.p_path, &ts)) 281 gotstat = 0; 282 else { 283 gotstat = 1; 284 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX | 285 S_IRWXU | S_IRWXG | S_IRWXO; 286 } 287 /* 288 * Changing the ownership probably won't succeed, unless we're root 289 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 290 * the mode; current BSD behavior is to remove all setuid bits on 291 * chown. If chown fails, lose setuid/setgid bits. 292 */ 293 if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid) 294 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 295 chown(to.p_path, fs->st_uid, fs->st_gid)) { 296 if (errno != EPERM) { 297 warn("chown: %s", to.p_path); 298 rval = 1; 299 } 300 fs->st_mode &= ~(S_ISUID | S_ISGID); 301 } 302 303 if (!gotstat || fs->st_mode != ts.st_mode) 304 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) { 305 warn("chown: %s", to.p_path); 306 rval = 1; 307 } 308 309 if (!gotstat || fs->st_flags != ts.st_flags) 310 if (fd ? 311 fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) { 312 warn("chflags: %s", to.p_path); 313 rval = 1; 314 } 315 316 return (rval); 317 } 318 319 void 320 usage() 321 { 322 (void)fprintf(stderr, "%s\n%s\n", 323 "usage: cp [-R [-H | -L | -P]] [-f | -i] [-p] src target", 324 " cp [-R [-H | -L | -P]] [-f | -i] [-p] src1 ... srcN directory"); 325 exit(1); 326 } 327