1 /* $OpenBSD: utils.c,v 1.25 2003/11/24 04:22:44 mickey Exp $ */ 2 /* $NetBSD: utils.c,v 1.6 1997/02/26 14:40:51 cgd Exp $ */ 3 4 /*- 5 * Copyright (c) 1991, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)utils.c 8.3 (Berkeley) 4/1/94"; 36 #else 37 static char rcsid[] = "$OpenBSD: utils.c,v 1.25 2003/11/24 04:22:44 mickey Exp $"; 38 #endif 39 #endif /* not lint */ 40 41 #include <sys/param.h> 42 #include <sys/stat.h> 43 #include <sys/mman.h> 44 #include <sys/time.h> 45 46 #include <err.h> 47 #include <errno.h> 48 #include <fcntl.h> 49 #include <fts.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <unistd.h> 54 55 #include "extern.h" 56 57 int 58 copy_file(FTSENT *entp, int dne) 59 { 60 static char buf[MAXBSIZE]; 61 struct stat to_stat, *fs; 62 int ch, checkch, from_fd, rcount, rval, to_fd, wcount; 63 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 64 char *p; 65 #endif 66 67 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 68 warn("%s", entp->fts_path); 69 return (1); 70 } 71 72 fs = entp->fts_statp; 73 74 /* 75 * In -f (force) mode, we always unlink the destination first 76 * if it exists. Note that -i and -f are mutually exclusive. 77 */ 78 if (!dne && fflag) 79 (void)unlink(to.p_path); 80 81 /* 82 * If the file exists and we're interactive, verify with the user. 83 * If the file DNE, set the mode to be the from file, minus setuid 84 * bits, modified by the umask; arguably wrong, but it makes copying 85 * executables work right and it's been that way forever. (The 86 * other choice is 666 or'ed with the execute bits on the from file 87 * modified by the umask.) 88 */ 89 if (!dne && !fflag) { 90 if (iflag) { 91 (void)fprintf(stderr, "overwrite %s? ", to.p_path); 92 checkch = ch = getchar(); 93 while (ch != '\n' && ch != EOF) 94 ch = getchar(); 95 if (checkch != 'y' && checkch != 'Y') { 96 (void)close(from_fd); 97 return (0); 98 } 99 } 100 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 101 } else 102 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 103 fs->st_mode & ~(S_ISTXT | S_ISUID | S_ISGID)); 104 105 if (to_fd == -1) { 106 warn("%s", to.p_path); 107 (void)close(from_fd); 108 return (1); 109 } 110 111 rval = 0; 112 113 /* 114 * Mmap and write if less than 8M (the limit is so we don't totally 115 * trash memory on big files. This is really a minor hack, but it 116 * wins some CPU back. 117 */ 118 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 119 if (fs->st_size <= 8 * 1048576) { 120 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 121 MAP_FILE|MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) { 122 warn("mmap: %s", entp->fts_path); 123 rval = 1; 124 } else { 125 madvise(p, fs->st_size, MADV_SEQUENTIAL); 126 if (write(to_fd, p, fs->st_size) != fs->st_size) { 127 warn("%s", to.p_path); 128 rval = 1; 129 } 130 /* Some systems don't unmap on close(2). */ 131 if (munmap(p, fs->st_size) < 0) { 132 warn("%s", entp->fts_path); 133 rval = 1; 134 } 135 } 136 } else 137 #endif 138 { 139 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 140 wcount = write(to_fd, buf, rcount); 141 if (rcount != wcount || wcount == -1) { 142 warn("%s", to.p_path); 143 rval = 1; 144 break; 145 } 146 } 147 if (rcount < 0) { 148 warn("%s", entp->fts_path); 149 rval = 1; 150 } 151 } 152 153 if (rval == 1) { 154 (void)close(from_fd); 155 (void)close(to_fd); 156 return (1); 157 } 158 159 if (pflag && setfile(fs, to_fd)) 160 rval = 1; 161 /* 162 * If the source was setuid or setgid, lose the bits unless the 163 * copy is owned by the same user and group. 164 */ 165 #define RETAINBITS \ 166 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 167 else if (fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) { 168 if (fstat(to_fd, &to_stat)) { 169 warn("%s", to.p_path); 170 rval = 1; 171 } else if (fs->st_gid == to_stat.st_gid && 172 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) { 173 warn("%s", to.p_path); 174 rval = 1; 175 } 176 } 177 (void)close(from_fd); 178 if (close(to_fd)) { 179 warn("%s", to.p_path); 180 rval = 1; 181 } 182 return (rval); 183 } 184 185 int 186 copy_link(FTSENT *p, int exists) 187 { 188 int len; 189 char link[MAXPATHLEN]; 190 191 if ((len = readlink(p->fts_path, link, sizeof(link)-1)) == -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 (pflag ? setlink(p->fts_statp) : 0); 205 } 206 207 int 208 copy_fifo(struct stat *from_stat, int exists) 209 { 210 if (exists && unlink(to.p_path)) { 211 warn("unlink: %s", to.p_path); 212 return (1); 213 } 214 if (mkfifo(to.p_path, from_stat->st_mode)) { 215 warn("mkfifo: %s", to.p_path); 216 return (1); 217 } 218 return (pflag ? setfile(from_stat, 0) : 0); 219 } 220 221 int 222 copy_special(struct stat *from_stat, int exists) 223 { 224 if (exists && unlink(to.p_path)) { 225 warn("unlink: %s", to.p_path); 226 return (1); 227 } 228 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 229 warn("mknod: %s", to.p_path); 230 return (1); 231 } 232 return (pflag ? setfile(from_stat, 0) : 0); 233 } 234 235 236 int 237 setfile(struct stat *fs, int fd) 238 { 239 static struct timeval tv[2]; 240 int rval; 241 242 rval = 0; 243 fs->st_mode &= S_ISTXT | 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_ISTXT | 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 /* 271 * XXX 272 * NFS doesn't support chflags; ignore errors unless there's reason 273 * to believe we're losing bits. (Note, this still won't be right 274 * if the server supports flags and we were trying to *remove* flags 275 * on a file that we copied, i.e., that we didn't create.) 276 */ 277 errno = 0; 278 if (fd ? fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) 279 if (errno != EOPNOTSUPP || fs->st_flags != 0) { 280 warn("chflags: %s", to.p_path); 281 rval = 1; 282 } 283 return (rval); 284 } 285 286 287 int 288 setlink(struct stat *fs) 289 { 290 291 if (lchown(to.p_path, fs->st_uid, fs->st_gid)) { 292 if (errno != EPERM) { 293 warn("lchown: %s", to.p_path); 294 return (1); 295 } 296 } 297 return (0); 298 } 299 300 301 void 302 usage(void) 303 { 304 (void)fprintf(stderr, 305 "usage: %s [-R [-H | -L | -P]] [-fip] src target\n", __progname); 306 (void)fprintf(stderr, 307 " %s [-R [-H | -L | -P]] [-fip] src1 ... srcN directory\n", 308 __progname); 309 exit(1); 310 } 311