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 <limits.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <sysexits.h> 56 #include <unistd.h> 57 58 #include "extern.h" 59 60 int 61 copy_file(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; 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 (void)close(from_fd); 182 if (close(to_fd)) { 183 warn("%s", to.p_path); 184 rval = 1; 185 } 186 return (rval); 187 } 188 189 int 190 copy_link(FTSENT *p, int exists) 191 { 192 int len; 193 char llink[PATH_MAX]; 194 195 if ((len = readlink(p->fts_path, llink, sizeof(llink) - 1)) == -1) { 196 warn("readlink: %s", p->fts_path); 197 return (1); 198 } 199 llink[len] = '\0'; 200 if (exists && unlink(to.p_path)) { 201 warn("unlink: %s", to.p_path); 202 return (1); 203 } 204 if (symlink(llink, to.p_path)) { 205 warn("symlink: %s", llink); 206 return (1); 207 } 208 return (0); 209 } 210 211 int 212 copy_fifo(struct stat *from_stat, int exists) 213 { 214 if (exists && unlink(to.p_path)) { 215 warn("unlink: %s", to.p_path); 216 return (1); 217 } 218 if (mkfifo(to.p_path, from_stat->st_mode)) { 219 warn("mkfifo: %s", to.p_path); 220 return (1); 221 } 222 return (pflag ? setfile(from_stat, 0) : 0); 223 } 224 225 int 226 copy_special(struct stat *from_stat, int exists) 227 { 228 if (exists && unlink(to.p_path)) { 229 warn("unlink: %s", to.p_path); 230 return (1); 231 } 232 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 233 warn("mknod: %s", to.p_path); 234 return (1); 235 } 236 return (pflag ? setfile(from_stat, 0) : 0); 237 } 238 239 int 240 setfile(struct stat *fs, int fd) 241 { 242 static struct timeval tv[2]; 243 struct stat ts; 244 int rval; 245 int gotstat; 246 247 rval = 0; 248 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | 249 S_IRWXU | S_IRWXG | S_IRWXO; 250 251 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 252 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 253 if (utimes(to.p_path, tv)) { 254 warn("utimes: %s", to.p_path); 255 rval = 1; 256 } 257 if (fd ? fstat(fd, &ts) : stat(to.p_path, &ts)) 258 gotstat = 0; 259 else { 260 gotstat = 1; 261 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX | 262 S_IRWXU | S_IRWXG | S_IRWXO; 263 } 264 /* 265 * Changing the ownership probably won't succeed, unless we're root 266 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 267 * the mode; current BSD behavior is to remove all setuid bits on 268 * chown. If chown fails, lose setuid/setgid bits. 269 */ 270 if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid) 271 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 272 chown(to.p_path, fs->st_uid, fs->st_gid)) { 273 if (errno != EPERM) { 274 warn("chown: %s", to.p_path); 275 rval = 1; 276 } 277 fs->st_mode &= ~(S_ISUID | S_ISGID); 278 } 279 280 if (!gotstat || fs->st_mode != ts.st_mode) 281 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) { 282 warn("chmod: %s", to.p_path); 283 rval = 1; 284 } 285 286 if (!gotstat || fs->st_flags != ts.st_flags) 287 if (fd ? 288 fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) { 289 warn("chflags: %s", to.p_path); 290 rval = 1; 291 } 292 293 return (rval); 294 } 295 296 void 297 usage(void) 298 { 299 300 (void)fprintf(stderr, "%s\n%s\n", 301 "usage: cp [-R [-H | -L | -P]] [-f | -i] [-pv] src target", 302 " cp [-R [-H | -L | -P]] [-f | -i] [-pv] src1 ... srcN directory"); 303 exit(EX_USAGE); 304 } 305