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 1.14 1997/10/03 18:11:14 wosch 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, wresid; 64 char *bufp; 65 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 66 char *p; 67 #endif 68 69 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 70 warn("%s", entp->fts_path); 71 return (1); 72 } 73 74 fs = entp->fts_statp; 75 76 /* 77 * If the file exists and we're interactive, verify with the user. 78 * If the file DNE, set the mode to be the from file, minus setuid 79 * bits, modified by the umask; arguably wrong, but it makes copying 80 * executables work right and it's been that way forever. (The 81 * other choice is 666 or'ed with the execute bits on the from file 82 * modified by the umask.) 83 */ 84 if (!dne) { 85 #define YESNO "(y/n [n]) " 86 if (iflag) { 87 (void)fprintf(stderr, "overwrite %s? %s", 88 to.p_path, YESNO); 89 checkch = ch = getchar(); 90 while (ch != '\n' && ch != EOF) 91 ch = getchar(); 92 if (checkch != 'y' && checkch != 'Y') { 93 (void)close(from_fd); 94 (void)fprintf(stderr, "not overwritten\n"); 95 return (0); 96 } 97 } 98 99 if (fflag) { 100 /* remove existing destination file name, 101 * create a new file */ 102 (void)unlink(to.p_path); 103 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 104 fs->st_mode & ~(S_ISUID | S_ISGID)); 105 } else 106 /* overwrite existing destination file name */ 107 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 108 } else 109 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 110 fs->st_mode & ~(S_ISUID | S_ISGID)); 111 112 if (to_fd == -1) { 113 warn("%s", to.p_path); 114 (void)close(from_fd); 115 return (1);; 116 } 117 118 rval = 0; 119 120 /* 121 * Mmap and write if less than 8M (the limit is so we don't totally 122 * trash memory on big files. This is really a minor hack, but it 123 * wins some CPU back. 124 */ 125 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 126 if (fs->st_size <= 8 * 1048576) { 127 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 128 MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) { 129 warn("%s", entp->fts_path); 130 rval = 1; 131 } else { 132 for (bufp = p, wresid = fs->st_size; ; 133 bufp += wcount, wresid -= wcount) 134 wcount = write(to_fd, bufp, wresid); 135 if (wcount >= wresid || wcount <= 0) 136 break; 137 } 138 if (wcount != wresid) { 139 warn("%s", to.p_path); 140 rval = 1; 141 } 142 /* Some systems don't unmap on close(2). */ 143 if (munmap(p, fs->st_size) < 0) { 144 warn("%s", entp->fts_path); 145 rval = 1; 146 } 147 } 148 } else 149 #endif 150 { 151 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 152 for (bufp = buf, wresid = rcount; ; 153 bufp += wcount, wresid -= wcount) { 154 wcount = write(to_fd, bufp, wresid); 155 if (wcount >= wresid || wcount <= 0) 156 break; 157 } 158 if (wcount != wresid) { 159 warn("%s", to.p_path); 160 rval = 1; 161 break; 162 } 163 } 164 if (rcount < 0) { 165 warn("%s", entp->fts_path); 166 rval = 1; 167 } 168 } 169 170 /* 171 * Don't remove the target even after an error. The target might 172 * not be a regular file, or its attributes might be important, 173 * or its contents might be irreplacable. It would only be safe 174 * to remove it if we created it and its length is 0. 175 */ 176 177 if (pflag && setfile(fs, to_fd)) 178 rval = 1; 179 /* 180 * If the source was setuid or setgid, lose the bits unless the 181 * copy is owned by the same user and group. 182 */ 183 #define RETAINBITS \ 184 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 185 else if (fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) 186 if (fstat(to_fd, &to_stat)) { 187 warn("%s", to.p_path); 188 rval = 1; 189 } else if (fs->st_gid == to_stat.st_gid && 190 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) { 191 warn("%s", to.p_path); 192 rval = 1; 193 } 194 (void)close(from_fd); 195 if (close(to_fd)) { 196 warn("%s", to.p_path); 197 rval = 1; 198 } 199 return (rval); 200 } 201 202 int 203 copy_link(p, exists) 204 FTSENT *p; 205 int exists; 206 { 207 int len; 208 char link[MAXPATHLEN]; 209 210 if ((len = readlink(p->fts_path, link, sizeof(link))) == -1) { 211 warn("readlink: %s", p->fts_path); 212 return (1); 213 } 214 link[len] = '\0'; 215 if (exists && unlink(to.p_path)) { 216 warn("unlink: %s", to.p_path); 217 return (1); 218 } 219 if (symlink(link, to.p_path)) { 220 warn("symlink: %s", link); 221 return (1); 222 } 223 return (0); 224 } 225 226 int 227 copy_fifo(from_stat, exists) 228 struct stat *from_stat; 229 int exists; 230 { 231 if (exists && unlink(to.p_path)) { 232 warn("unlink: %s", to.p_path); 233 return (1); 234 } 235 if (mkfifo(to.p_path, from_stat->st_mode)) { 236 warn("mkfifo: %s", to.p_path); 237 return (1); 238 } 239 return (pflag ? setfile(from_stat, 0) : 0); 240 } 241 242 int 243 copy_special(from_stat, exists) 244 struct stat *from_stat; 245 int exists; 246 { 247 if (exists && unlink(to.p_path)) { 248 warn("unlink: %s", to.p_path); 249 return (1); 250 } 251 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 252 warn("mknod: %s", to.p_path); 253 return (1); 254 } 255 return (pflag ? setfile(from_stat, 0) : 0); 256 } 257 258 259 int 260 setfile(fs, fd) 261 register struct stat *fs; 262 int fd; 263 { 264 static struct timeval tv[2]; 265 int rval; 266 267 rval = 0; 268 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | 269 S_IRWXU | S_IRWXG | S_IRWXO; 270 271 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 272 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 273 if (utimes(to.p_path, tv)) { 274 warn("utimes: %s", to.p_path); 275 rval = 1; 276 } 277 /* 278 * Changing the ownership probably won't succeed, unless we're root 279 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 280 * the mode; current BSD behavior is to remove all setuid bits on 281 * chown. If chown fails, lose setuid/setgid bits. 282 */ 283 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 284 chown(to.p_path, fs->st_uid, fs->st_gid)) { 285 if (errno != EPERM) { 286 warn("chown: %s", to.p_path); 287 rval = 1; 288 } 289 fs->st_mode &= ~(S_ISUID | S_ISGID); 290 } 291 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) { 292 warn("chown: %s", to.p_path); 293 rval = 1; 294 } 295 296 if (fd ? 297 fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) { 298 warn("chflags: %s", to.p_path); 299 rval = 1; 300 } 301 return (rval); 302 } 303 304 void 305 usage() 306 { 307 (void)fprintf(stderr, "%s\n%s\n", 308 "usage: cp [-R [-H | -L | -P]] [-f | -i] [-p] src target", 309 " cp [-R [-H | -L | -P]] [-f | -i] [-p] src1 ... srcN directory"); 310 exit(1); 311 } 312