utils.c revision 1.1
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 34 #ifndef lint 35 static char sccsid[] = "@(#)utils.c 8.3 (Berkeley) 4/1/94"; 36 #endif /* not lint */ 37 38 #include <sys/param.h> 39 #include <sys/stat.h> 40 #include <sys/mman.h> 41 #include <sys/time.h> 42 43 #include <err.h> 44 #include <errno.h> 45 #include <fcntl.h> 46 #include <fts.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <unistd.h> 51 52 #include "extern.h" 53 54 int 55 copy_file(entp, dne) 56 FTSENT *entp; 57 int dne; 58 { 59 static char buf[MAXBSIZE]; 60 struct stat to_stat, *fs; 61 int ch, checkch, from_fd, rcount, rval, to_fd, wcount; 62 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 63 char *p; 64 #endif 65 66 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 67 warn("%s", entp->fts_path); 68 return (1); 69 } 70 71 fs = entp->fts_statp; 72 73 /* 74 * If the file exists and we're interactive, verify with the user. 75 * If the file DNE, set the mode to be the from file, minus setuid 76 * bits, modified by the umask; arguably wrong, but it makes copying 77 * executables work right and it's been that way forever. (The 78 * other choice is 666 or'ed with the execute bits on the from file 79 * modified by the umask.) 80 */ 81 if (!dne) { 82 if (iflag) { 83 (void)fprintf(stderr, "overwrite %s? ", to.p_path); 84 checkch = ch = getchar(); 85 while (ch != '\n' && ch != EOF) 86 ch = getchar(); 87 if (checkch != 'y') { 88 (void)close(from_fd); 89 return (0); 90 } 91 } 92 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 93 } else 94 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 95 fs->st_mode & ~(S_ISUID | S_ISGID)); 96 97 if (to_fd == -1) { 98 warn("%s", to.p_path); 99 (void)close(from_fd); 100 return (1);; 101 } 102 103 rval = 0; 104 105 /* 106 * Mmap and write if less than 8M (the limit is so we don't totally 107 * trash memory on big files. This is really a minor hack, but it 108 * wins some CPU back. 109 */ 110 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 111 if (fs->st_size <= 8 * 1048576) { 112 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 113 0, from_fd, (off_t)0)) == (char *)-1) { 114 warn("%s", entp->fts_path); 115 rval = 1; 116 } else { 117 if (write(to_fd, p, fs->st_size) != fs->st_size) { 118 warn("%s", to.p_path); 119 rval = 1; 120 } 121 /* Some systems don't unmap on close(2). */ 122 if (munmap(p, fs->st_size) < 0) { 123 warn("%s", entp->fts_path); 124 rval = 1; 125 } 126 } 127 } else 128 #endif 129 { 130 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 131 wcount = write(to_fd, buf, rcount); 132 if (rcount != wcount || wcount == -1) { 133 warn("%s", to.p_path); 134 rval = 1; 135 break; 136 } 137 } 138 if (rcount < 0) { 139 warn("%s", entp->fts_path); 140 rval = 1; 141 } 142 } 143 144 /* If the copy went bad, lose the file. */ 145 if (rval == 1) { 146 (void)unlink(to.p_path); 147 (void)close(from_fd); 148 (void)close(to_fd); 149 return (1); 150 } 151 152 if (pflag && setfile(fs, to_fd)) 153 rval = 1; 154 /* 155 * If the source was setuid or setgid, lose the bits unless the 156 * copy is owned by the same user and group. 157 */ 158 #define RETAINBITS \ 159 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 160 else if (fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) 161 if (fstat(to_fd, &to_stat)) { 162 warn("%s", to.p_path); 163 rval = 1; 164 } else if (fs->st_gid == to_stat.st_gid && 165 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) { 166 warn("%s", to.p_path); 167 rval = 1; 168 } 169 (void)close(from_fd); 170 if (close(to_fd)) { 171 warn("%s", to.p_path); 172 rval = 1; 173 } 174 return (rval); 175 } 176 177 int 178 copy_link(p, exists) 179 FTSENT *p; 180 int exists; 181 { 182 int len; 183 char link[MAXPATHLEN]; 184 185 if ((len = readlink(p->fts_path, link, sizeof(link))) == -1) { 186 warn("readlink: %s", p->fts_path); 187 return (1); 188 } 189 link[len] = '\0'; 190 if (exists && unlink(to.p_path)) { 191 warn("unlink: %s", to.p_path); 192 return (1); 193 } 194 if (symlink(link, to.p_path)) { 195 warn("symlink: %s", link); 196 return (1); 197 } 198 return (0); 199 } 200 201 int 202 copy_fifo(from_stat, exists) 203 struct stat *from_stat; 204 int exists; 205 { 206 if (exists && unlink(to.p_path)) { 207 warn("unlink: %s", to.p_path); 208 return (1); 209 } 210 if (mkfifo(to.p_path, from_stat->st_mode)) { 211 warn("mkfifo: %s", to.p_path); 212 return (1); 213 } 214 return (pflag ? setfile(from_stat, 0) : 0); 215 } 216 217 int 218 copy_special(from_stat, exists) 219 struct stat *from_stat; 220 int exists; 221 { 222 if (exists && unlink(to.p_path)) { 223 warn("unlink: %s", to.p_path); 224 return (1); 225 } 226 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 227 warn("mknod: %s", to.p_path); 228 return (1); 229 } 230 return (pflag ? setfile(from_stat, 0) : 0); 231 } 232 233 234 int 235 setfile(fs, fd) 236 register struct stat *fs; 237 int fd; 238 { 239 static struct timeval tv[2]; 240 int rval; 241 242 rval = 0; 243 fs->st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO; 244 245 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 246 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 247 if (utimes(to.p_path, tv)) { 248 warn("utimes: %s", to.p_path); 249 rval = 1; 250 } 251 /* 252 * Changing the ownership probably won't succeed, unless we're root 253 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 254 * the mode; current BSD behavior is to remove all setuid bits on 255 * chown. If chown fails, lose setuid/setgid bits. 256 */ 257 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 258 chown(to.p_path, fs->st_uid, fs->st_gid)) { 259 if (errno != EPERM) { 260 warn("chown: %s", to.p_path); 261 rval = 1; 262 } 263 fs->st_mode &= ~(S_ISUID | S_ISGID); 264 } 265 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) { 266 warn("chown: %s", to.p_path); 267 rval = 1; 268 } 269 270 if (fd ? 271 fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) { 272 warn("chflags: %s", to.p_path); 273 rval = 1; 274 } 275 return (rval); 276 } 277 278 void 279 usage() 280 { 281 (void)fprintf(stderr, "%s\n%s\n", 282 "usage: cp [-R [-H | -L | -P] [-fip] src target", 283 " cp [-R [-H | -L | -P] [-fip] src1 ... srcN directory"); 284 exit(1); 285 } 286
Indexes created Tue Sep 23 02:09:52 GMT 2025