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 1.4 1995/06/14 05:41:27 bde Exp $ 34 */ 35 36 #ifndef lint 37 static char 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') { 90 (void)close(from_fd); 91 return (0); 92 } 93 } 94 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 95 } else 96 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 97 fs->st_mode & ~(S_ISUID | S_ISGID)); 98 99 if (to_fd == -1) { 100 warn("%s", to.p_path); 101 (void)close(from_fd); 102 return (1);; 103 } 104 105 rval = 0; 106 107 /* 108 * Mmap and write if less than 8M (the limit is so we don't totally 109 * trash memory on big files. This is really a minor hack, but it 110 * wins some CPU back. 111 */ 112 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 113 if (fs->st_size <= 8 * 1048576) { 114 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 115 0, from_fd, (off_t)0)) == (char *)-1) { 116 warn("%s", entp->fts_path); 117 rval = 1; 118 } else { 119 if (write(to_fd, p, fs->st_size) != fs->st_size) { 120 warn("%s", to.p_path); 121 rval = 1; 122 } 123 /* Some systems don't unmap on close(2). */ 124 if (munmap(p, fs->st_size) < 0) { 125 warn("%s", entp->fts_path); 126 rval = 1; 127 } 128 } 129 } else 130 #endif 131 { 132 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 133 wcount = write(to_fd, buf, rcount); 134 if (rcount != wcount || wcount == -1) { 135 warn("%s", to.p_path); 136 rval = 1; 137 break; 138 } 139 } 140 if (rcount < 0) { 141 warn("%s", entp->fts_path); 142 rval = 1; 143 } 144 } 145 146 /* 147 * Don't remove the target even after an error. The target might 148 * not be a regular file, or its attributes might be important, 149 * or its contents might be irreplacable. It would only be safe 150 * to remove it if we created it and its length is 0. 151 */ 152 153 if (pflag && setfile(fs, to_fd)) 154 rval = 1; 155 /* 156 * If the source was setuid or setgid, lose the bits unless the 157 * copy is owned by the same user and group. 158 */ 159 #define RETAINBITS \ 160 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 161 else if (fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) 162 if (fstat(to_fd, &to_stat)) { 163 warn("%s", to.p_path); 164 rval = 1; 165 } else if (fs->st_gid == to_stat.st_gid && 166 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) { 167 warn("%s", to.p_path); 168 rval = 1; 169 } 170 (void)close(from_fd); 171 if (close(to_fd)) { 172 warn("%s", to.p_path); 173 rval = 1; 174 } 175 return (rval); 176 } 177 178 int 179 copy_link(p, exists) 180 FTSENT *p; 181 int exists; 182 { 183 int len; 184 char link[MAXPATHLEN]; 185 186 if ((len = readlink(p->fts_path, link, sizeof(link))) == -1) { 187 warn("readlink: %s", p->fts_path); 188 return (1); 189 } 190 link[len] = '\0'; 191 if (exists && unlink(to.p_path)) { 192 warn("unlink: %s", to.p_path); 193 return (1); 194 } 195 if (symlink(link, to.p_path)) { 196 warn("symlink: %s", link); 197 return (1); 198 } 199 return (0); 200 } 201 202 int 203 copy_fifo(from_stat, exists) 204 struct stat *from_stat; 205 int exists; 206 { 207 if (exists && unlink(to.p_path)) { 208 warn("unlink: %s", to.p_path); 209 return (1); 210 } 211 if (mkfifo(to.p_path, from_stat->st_mode)) { 212 warn("mkfifo: %s", to.p_path); 213 return (1); 214 } 215 return (pflag ? setfile(from_stat, 0) : 0); 216 } 217 218 int 219 copy_special(from_stat, exists) 220 struct stat *from_stat; 221 int exists; 222 { 223 if (exists && unlink(to.p_path)) { 224 warn("unlink: %s", to.p_path); 225 return (1); 226 } 227 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 228 warn("mknod: %s", to.p_path); 229 return (1); 230 } 231 return (pflag ? setfile(from_stat, 0) : 0); 232 } 233 234 235 int 236 setfile(fs, fd) 237 register struct stat *fs; 238 int fd; 239 { 240 static struct timeval tv[2]; 241 int rval; 242 243 rval = 0; 244 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | 245 S_IRWXU | S_IRWXG | S_IRWXO; 246 247 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 248 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 249 if (utimes(to.p_path, tv)) { 250 warn("utimes: %s", to.p_path); 251 rval = 1; 252 } 253 /* 254 * Changing the ownership probably won't succeed, unless we're root 255 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 256 * the mode; current BSD behavior is to remove all setuid bits on 257 * chown. If chown fails, lose setuid/setgid bits. 258 */ 259 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 260 chown(to.p_path, fs->st_uid, fs->st_gid)) { 261 if (errno != EPERM) { 262 warn("chown: %s", to.p_path); 263 rval = 1; 264 } 265 fs->st_mode &= ~(S_ISUID | S_ISGID); 266 } 267 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) { 268 warn("chown: %s", to.p_path); 269 rval = 1; 270 } 271 272 if (fd ? 273 fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) { 274 warn("chflags: %s", to.p_path); 275 rval = 1; 276 } 277 return (rval); 278 } 279 280 void 281 usage() 282 { 283 (void)fprintf(stderr, "%s\n%s\n", 284 "usage: cp [-R [-H | -L | -P] [-fip] src target", 285 " cp [-R [-H | -L | -P] [-fip] src1 ... srcN directory"); 286 exit(1); 287 } 288