1 /* $NetBSD: utils.c,v 1.3 1995/03/21 09:02:17 cgd Exp $ */ 2 3 /*- 4 * Copyright (c) 1991, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)utils.c 8.3 (Berkeley) 4/1/94"; 39 #else 40 static char rcsid[] = "$NetBSD: utils.c,v 1.3 1995/03/21 09:02:17 cgd Exp $"; 41 #endif 42 #endif /* not lint */ 43 44 #include <sys/param.h> 45 #include <sys/stat.h> 46 #include <sys/mman.h> 47 #include <sys/time.h> 48 49 #include <err.h> 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <fts.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 58 #include "extern.h" 59 60 int 61 copy_file(entp, dne) 62 FTSENT *entp; 63 int dne; 64 { 65 static char buf[MAXBSIZE]; 66 struct stat to_stat, *fs; 67 int ch, checkch, from_fd, rcount, rval, to_fd, wcount; 68 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 69 char *p; 70 #endif 71 72 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 73 warn("%s", entp->fts_path); 74 return (1); 75 } 76 77 fs = entp->fts_statp; 78 79 /* 80 * If the file exists and we're interactive, verify with the user. 81 * If the file DNE, set the mode to be the from file, minus setuid 82 * bits, modified by the umask; arguably wrong, but it makes copying 83 * executables work right and it's been that way forever. (The 84 * other choice is 666 or'ed with the execute bits on the from file 85 * modified by the umask.) 86 */ 87 if (!dne) { 88 if (iflag) { 89 (void)fprintf(stderr, "overwrite %s? ", to.p_path); 90 checkch = ch = getchar(); 91 while (ch != '\n' && ch != EOF) 92 ch = getchar(); 93 if (checkch != 'y' && checkch != 'Y') { 94 (void)close(from_fd); 95 return (0); 96 } 97 } 98 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 99 } else 100 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 101 fs->st_mode & ~(S_ISUID | S_ISGID)); 102 103 if (to_fd == -1) { 104 warn("%s", to.p_path); 105 (void)close(from_fd); 106 return (1);; 107 } 108 109 rval = 0; 110 111 /* 112 * Mmap and write if less than 8M (the limit is so we don't totally 113 * trash memory on big files. This is really a minor hack, but it 114 * wins some CPU back. 115 */ 116 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 117 if (fs->st_size <= 8 * 1048576) { 118 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 119 0, from_fd, (off_t)0)) == (char *)-1) { 120 warn("%s", entp->fts_path); 121 rval = 1; 122 } else { 123 if (write(to_fd, p, fs->st_size) != fs->st_size) { 124 warn("%s", to.p_path); 125 rval = 1; 126 } 127 /* Some systems don't unmap on close(2). */ 128 if (munmap(p, fs->st_size) < 0) { 129 warn("%s", entp->fts_path); 130 rval = 1; 131 } 132 } 133 } else 134 #endif 135 { 136 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 137 wcount = write(to_fd, buf, rcount); 138 if (rcount != wcount || wcount == -1) { 139 warn("%s", to.p_path); 140 rval = 1; 141 break; 142 } 143 } 144 if (rcount < 0) { 145 warn("%s", entp->fts_path); 146 rval = 1; 147 } 148 } 149 150 /* If the copy went bad, lose the file. */ 151 if (rval == 1) { 152 (void)unlink(to.p_path); 153 (void)close(from_fd); 154 (void)close(to_fd); 155 return (1); 156 } 157 158 if (pflag && setfile(fs, to_fd)) 159 rval = 1; 160 /* 161 * If the source was setuid or setgid, lose the bits unless the 162 * copy is owned by the same user and group. 163 */ 164 #define RETAINBITS \ 165 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 166 else if (fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) 167 if (fstat(to_fd, &to_stat)) { 168 warn("%s", to.p_path); 169 rval = 1; 170 } else if (fs->st_gid == to_stat.st_gid && 171 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) { 172 warn("%s", to.p_path); 173 rval = 1; 174 } 175 (void)close(from_fd); 176 if (close(to_fd)) { 177 warn("%s", to.p_path); 178 rval = 1; 179 } 180 return (rval); 181 } 182 183 int 184 copy_link(p, exists) 185 FTSENT *p; 186 int exists; 187 { 188 int len; 189 char link[MAXPATHLEN]; 190 191 if ((len = readlink(p->fts_path, link, sizeof(link))) == -1) { 192 warn("readlink: %s", p->fts_path); 193 return (1); 194 } 195 link[len] = '\0'; 196 if (exists && unlink(to.p_path)) { 197 warn("unlink: %s", to.p_path); 198 return (1); 199 } 200 if (symlink(link, to.p_path)) { 201 warn("symlink: %s", link); 202 return (1); 203 } 204 return (0); 205 } 206 207 int 208 copy_fifo(from_stat, exists) 209 struct stat *from_stat; 210 int exists; 211 { 212 if (exists && unlink(to.p_path)) { 213 warn("unlink: %s", to.p_path); 214 return (1); 215 } 216 if (mkfifo(to.p_path, from_stat->st_mode)) { 217 warn("mkfifo: %s", to.p_path); 218 return (1); 219 } 220 return (pflag ? setfile(from_stat, 0) : 0); 221 } 222 223 int 224 copy_special(from_stat, exists) 225 struct stat *from_stat; 226 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 } 238 239 240 int 241 setfile(fs, fd) 242 register struct stat *fs; 243 int fd; 244 { 245 static struct timeval tv[2]; 246 int rval; 247 248 rval = 0; 249 fs->st_mode &= S_ISUID | S_ISGID | 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 /* 258 * Changing the ownership probably won't succeed, unless we're root 259 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 260 * the mode; current BSD behavior is to remove all setuid bits on 261 * chown. If chown fails, lose setuid/setgid bits. 262 */ 263 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 264 chown(to.p_path, fs->st_uid, fs->st_gid)) { 265 if (errno != EPERM) { 266 warn("chown: %s", to.p_path); 267 rval = 1; 268 } 269 fs->st_mode &= ~(S_ISUID | S_ISGID); 270 } 271 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) { 272 warn("chown: %s", to.p_path); 273 rval = 1; 274 } 275 276 if (fd ? 277 fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) { 278 warn("chflags: %s", to.p_path); 279 rval = 1; 280 } 281 return (rval); 282 } 283 284 void 285 usage() 286 { 287 (void)fprintf(stderr, "%s\n%s\n", 288 "usage: cp [-R [-H | -L | -P] [-fip] src target", 289 " cp [-R [-H | -L | -P] [-fip] src1 ... srcN directory"); 290 exit(1); 291 } 292