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: utils.c,v 1.13 1997/02/22 14:01:34 peter Exp $ 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 #define YESNO "(y/n [n]) " 85 if (iflag) { 86 (void)fprintf(stderr, "overwrite %s? %s", 87 to.p_path, YESNO); 88 checkch = ch = getchar(); 89 while (ch != '\n' && ch != EOF) 90 ch = getchar(); 91 if (checkch != 'y' && checkch != 'Y') { 92 (void)close(from_fd); 93 (void)fprintf(stderr, "not overwritten\n"); 94 return (0); 95 } 96 } 97 98 if (fflag) { 99 /* remove existing destination file name, 100 * create a new file */ 101 (void)unlink(to.p_path); 102 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 103 fs->st_mode & ~(S_ISUID | S_ISGID)); 104 } else 105 /* overwrite existing destination file name */ 106 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 107 } else 108 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 109 fs->st_mode & ~(S_ISUID | S_ISGID)); 110 111 if (to_fd == -1) { 112 warn("%s", to.p_path); 113 (void)close(from_fd); 114 return (1);; 115 } 116 117 rval = 0; 118 119 /* 120 * Mmap and write if less than 8M (the limit is so we don't totally 121 * trash memory on big files. This is really a minor hack, but it 122 * wins some CPU back. 123 */ 124 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 125 if (fs->st_size <= 8 * 1048576) { 126 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 127 MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) { 128 warn("%s", entp->fts_path); 129 rval = 1; 130 } else { 131 if (write(to_fd, p, fs->st_size) != fs->st_size) { 132 warn("%s", to.p_path); 133 rval = 1; 134 } 135 /* Some systems don't unmap on close(2). */ 136 if (munmap(p, fs->st_size) < 0) { 137 warn("%s", entp->fts_path); 138 rval = 1; 139 } 140 } 141 } else 142 #endif 143 { 144 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 145 wcount = write(to_fd, buf, rcount); 146 if (rcount != wcount || wcount == -1) { 147 warn("%s", to.p_path); 148 rval = 1; 149 break; 150 } 151 } 152 if (rcount < 0) { 153 warn("%s", entp->fts_path); 154 rval = 1; 155 } 156 } 157 158 /* 159 * Don't remove the target even after an error. The target might 160 * not be a regular file, or its attributes might be important, 161 * or its contents might be irreplacable. It would only be safe 162 * to remove it if we created it and its length is 0. 163 */ 164 165 if (pflag && setfile(fs, to_fd)) 166 rval = 1; 167 /* 168 * If the source was setuid or setgid, lose the bits unless the 169 * copy is owned by the same user and group. 170 */ 171 #define RETAINBITS \ 172 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 173 else if (fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) 174 if (fstat(to_fd, &to_stat)) { 175 warn("%s", to.p_path); 176 rval = 1; 177 } else if (fs->st_gid == to_stat.st_gid && 178 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) { 179 warn("%s", to.p_path); 180 rval = 1; 181 } 182 (void)close(from_fd); 183 if (close(to_fd)) { 184 warn("%s", to.p_path); 185 rval = 1; 186 } 187 return (rval); 188 } 189 190 int 191 copy_link(p, exists) 192 FTSENT *p; 193 int exists; 194 { 195 int len; 196 char link[MAXPATHLEN]; 197 198 if ((len = readlink(p->fts_path, link, sizeof(link))) == -1) { 199 warn("readlink: %s", p->fts_path); 200 return (1); 201 } 202 link[len] = '\0'; 203 if (exists && unlink(to.p_path)) { 204 warn("unlink: %s", to.p_path); 205 return (1); 206 } 207 if (symlink(link, to.p_path)) { 208 warn("symlink: %s", link); 209 return (1); 210 } 211 return (0); 212 } 213 214 int 215 copy_fifo(from_stat, exists) 216 struct stat *from_stat; 217 int exists; 218 { 219 if (exists && unlink(to.p_path)) { 220 warn("unlink: %s", to.p_path); 221 return (1); 222 } 223 if (mkfifo(to.p_path, from_stat->st_mode)) { 224 warn("mkfifo: %s", to.p_path); 225 return (1); 226 } 227 return (pflag ? setfile(from_stat, 0) : 0); 228 } 229 230 int 231 copy_special(from_stat, exists) 232 struct stat *from_stat; 233 int exists; 234 { 235 if (exists && unlink(to.p_path)) { 236 warn("unlink: %s", to.p_path); 237 return (1); 238 } 239 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 240 warn("mknod: %s", to.p_path); 241 return (1); 242 } 243 return (pflag ? setfile(from_stat, 0) : 0); 244 } 245 246 247 int 248 setfile(fs, fd) 249 register struct stat *fs; 250 int fd; 251 { 252 static struct timeval tv[2]; 253 int rval; 254 255 rval = 0; 256 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | 257 S_IRWXU | S_IRWXG | S_IRWXO; 258 259 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 260 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 261 if (utimes(to.p_path, tv)) { 262 warn("utimes: %s", to.p_path); 263 rval = 1; 264 } 265 /* 266 * Changing the ownership probably won't succeed, unless we're root 267 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 268 * the mode; current BSD behavior is to remove all setuid bits on 269 * chown. If chown fails, lose setuid/setgid bits. 270 */ 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 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) { 280 warn("chown: %s", to.p_path); 281 rval = 1; 282 } 283 284 if (fd ? 285 fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) { 286 warn("chflags: %s", to.p_path); 287 rval = 1; 288 } 289 return (rval); 290 } 291 292 void 293 usage() 294 { 295 (void)fprintf(stderr, "%s\n%s\n", 296 "usage: cp [-R [-H | -L | -P]] [-f | -i] [-p] src target", 297 " cp [-R [-H | -L | -P]] [-f | -i] [-p] src1 ... srcN directory"); 298 exit(1); 299 } 300