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 * $Id$ 34 */ 35 36 #ifndef lint 37 static char const sccsid[] = "@(#)utils.c 8.3 (Berkeley) 4/1/94"; 38 #endif /* not lint */ 39 40 #include <sys/param.h> 41 #include <sys/stat.h> 42 #include <sys/mman.h> 43 #include <sys/time.h> 44 45 #include <err.h> 46 #include <errno.h> 47 #include <fcntl.h> 48 #include <fts.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <unistd.h> 53 54 #include "extern.h" 55 56 int 57 copy_file(entp, dne) 58 FTSENT *entp; 59 int dne; 60 { 61 static char buf[MAXBSIZE]; 62 struct stat to_stat, *fs; 63 int ch, checkch, from_fd, rcount, rval, to_fd, wcount; 64 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 65 char *p; 66 #endif 67 68 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 69 warn("%s", entp->fts_path); 70 return (1); 71 } 72 73 fs = entp->fts_statp; 74 75 /* 76 * If the file exists and we're interactive, verify with the user. 77 * If the file DNE, set the mode to be the from file, minus setuid 78 * bits, modified by the umask; arguably wrong, but it makes copying 79 * executables work right and it's been that way forever. (The 80 * other choice is 666 or'ed with the execute bits on the from file 81 * modified by the umask.) 82 */ 83 if (!dne) { 84 if (iflag) { 85 (void)fprintf(stderr, "overwrite %s? ", to.p_path); 86 checkch = ch = getchar(); 87 while (ch != '\n' && ch != EOF) 88 ch = getchar(); 89 if (checkch != 'y' && checkch != 'Y') { 90 (void)close(from_fd); 91 return (0); 92 } 93 } 94 95 if (fflag) { 96 /* remove existing destination file name, 97 * create a new file */ 98 (void)unlink(to.p_path); 99 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 100 fs->st_mode & ~(S_ISUID | S_ISGID)); 101 } else 102 /* overwrite existing destination file name */ 103 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 104 } else 105 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 106 fs->st_mode & ~(S_ISUID | S_ISGID)); 107 108 if (to_fd == -1) { 109 warn("%s", to.p_path); 110 (void)close(from_fd); 111 return (1);; 112 } 113 114 rval = 0; 115 116 /* 117 * Mmap and write if less than 8M (the limit is so we don't totally 118 * trash memory on big files. This is really a minor hack, but it 119 * wins some CPU back. 120 */ 121 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 122 if (fs->st_size <= 8 * 1048576) { 123 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 124 MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) { 125 warn("%s", entp->fts_path); 126 rval = 1; 127 } else { 128 if (write(to_fd, p, fs->st_size) != fs->st_size) { 129 warn("%s", to.p_path); 130 rval = 1; 131 } 132 /* Some systems don't unmap on close(2). */ 133 if (munmap(p, fs->st_size) < 0) { 134 warn("%s", entp->fts_path); 135 rval = 1; 136 } 137 } 138 } else 139 #endif 140 { 141 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 142 wcount = write(to_fd, buf, rcount); 143 if (rcount != wcount || wcount == -1) { 144 warn("%s", to.p_path); 145 rval = 1; 146 break; 147 } 148 } 149 if (rcount < 0) { 150 warn("%s", entp->fts_path); 151 rval = 1; 152 } 153 } 154 155 /* 156 * Don't remove the target even after an error. The target might 157 * not be a regular file, or its attributes might be important, 158 * or its contents might be irreplacable. It would only be safe 159 * to remove it if we created it and its length is 0. 160 */ 161 162 if (pflag && setfile(fs, to_fd)) 163 rval = 1; 164 /* 165 * If the source was setuid or setgid, lose the bits unless the 166 * copy is owned by the same user and group. 167 */ 168 #define RETAINBITS \ 169 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 170 else if (fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) 171 if (fstat(to_fd, &to_stat)) { 172 warn("%s", to.p_path); 173 rval = 1; 174 } else if (fs->st_gid == to_stat.st_gid && 175 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) { 176 warn("%s", to.p_path); 177 rval = 1; 178 } 179 (void)close(from_fd); 180 if (close(to_fd)) { 181 warn("%s", to.p_path); 182 rval = 1; 183 } 184 return (rval); 185 } 186 187 int 188 copy_link(p, exists) 189 FTSENT *p; 190 int exists; 191 { 192 int len; 193 char link[MAXPATHLEN]; 194 195 if ((len = readlink(p->fts_path, link, sizeof(link))) == -1) { 196 warn("readlink: %s", p->fts_path); 197 return (1); 198 } 199 link[len] = '\0'; 200 if (exists && unlink(to.p_path)) { 201 warn("unlink: %s", to.p_path); 202 return (1); 203 } 204 if (symlink(link, to.p_path)) { 205 warn("symlink: %s", link); 206 return (1); 207 } 208 return (0); 209 } 210 211 int 212 copy_fifo(from_stat, exists) 213 struct stat *from_stat; 214 int exists; 215 { 216 if (exists && unlink(to.p_path)) { 217 warn("unlink: %s", to.p_path); 218 return (1); 219 } 220 if (mkfifo(to.p_path, from_stat->st_mode)) { 221 warn("mkfifo: %s", to.p_path); 222 return (1); 223 } 224 return (pflag ? setfile(from_stat, 0) : 0); 225 } 226 227 int 228 copy_special(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 (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 237 warn("mknod: %s", to.p_path); 238 return (1); 239 } 240 return (pflag ? setfile(from_stat, 0) : 0); 241 } 242 243 244 int 245 setfile(fs, fd) 246 register struct stat *fs; 247 int fd; 248 { 249 static struct timeval tv[2]; 250 int rval; 251 252 rval = 0; 253 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | 254 S_IRWXU | S_IRWXG | S_IRWXO; 255 256 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 257 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 258 if (utimes(to.p_path, tv)) { 259 warn("utimes: %s", to.p_path); 260 rval = 1; 261 } 262 /* 263 * Changing the ownership probably won't succeed, unless we're root 264 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 265 * the mode; current BSD behavior is to remove all setuid bits on 266 * chown. If chown fails, lose setuid/setgid bits. 267 */ 268 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 269 chown(to.p_path, fs->st_uid, fs->st_gid)) { 270 if (errno != EPERM) { 271 warn("chown: %s", to.p_path); 272 rval = 1; 273 } 274 fs->st_mode &= ~(S_ISUID | S_ISGID); 275 } 276 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) { 277 warn("chown: %s", to.p_path); 278 rval = 1; 279 } 280 281 if (fd ? 282 fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) { 283 warn("chflags: %s", to.p_path); 284 rval = 1; 285 } 286 return (rval); 287 } 288 289 void 290 usage() 291 { 292 (void)fprintf(stderr, "%s\n%s\n", 293 "usage: cp [-R [-H | -L | -P]] [-f | -i] [-p] src target", 294 " cp [-R [-H | -L | -P]] [-f | -i] [-p] src1 ... srcN directory"); 295 exit(1); 296 } 297