1 /* $OpenBSD: utils.c,v 1.29 2007/09/22 21:10:49 sobrado 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 1.29 2007/09/22 21:10:49 sobrado 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; 61 static char *zeroes; 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 (!buf) { 69 buf = malloc(MAXBSIZE); 70 if (!buf) 71 err(1, "malloc"); 72 } 73 if (!zeroes) { 74 zeroes = malloc(MAXBSIZE); 75 if (!zeroes) 76 err(1, "malloc"); 77 memset(zeroes, 0, MAXBSIZE); 78 } 79 80 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 81 warn("%s", entp->fts_path); 82 return (1); 83 } 84 85 fs = entp->fts_statp; 86 87 /* 88 * In -f (force) mode, we always unlink the destination first 89 * if it exists. Note that -i and -f are mutually exclusive. 90 */ 91 if (!dne && fflag) 92 (void)unlink(to.p_path); 93 94 /* 95 * If the file exists and we're interactive, verify with the user. 96 * If the file DNE, set the mode to be the from file, minus setuid 97 * bits, modified by the umask; arguably wrong, but it makes copying 98 * executables work right and it's been that way forever. (The 99 * other choice is 666 or'ed with the execute bits on the from file 100 * modified by the umask.) 101 */ 102 if (!dne && !fflag) { 103 if (iflag) { 104 (void)fprintf(stderr, "overwrite %s? ", to.p_path); 105 checkch = ch = getchar(); 106 while (ch != '\n' && ch != EOF) 107 ch = getchar(); 108 if (checkch != 'y' && checkch != 'Y') { 109 (void)close(from_fd); 110 return (0); 111 } 112 } 113 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 114 } else 115 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 116 fs->st_mode & ~(S_ISTXT | S_ISUID | S_ISGID)); 117 118 if (to_fd == -1) { 119 warn("%s", to.p_path); 120 (void)close(from_fd); 121 return (1); 122 } 123 124 rval = 0; 125 126 /* 127 * Mmap and write if less than 8M (the limit is so we don't totally 128 * trash memory on big files. This is really a minor hack, but it 129 * wins some CPU back. 130 */ 131 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 132 if (fs->st_size <= 8 * 1048576) { 133 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 134 MAP_FILE|MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) { 135 warn("mmap: %s", entp->fts_path); 136 rval = 1; 137 } else { 138 madvise(p, fs->st_size, MADV_SEQUENTIAL); 139 if (write(to_fd, p, fs->st_size) != fs->st_size) { 140 warn("%s", to.p_path); 141 rval = 1; 142 } 143 /* Some systems don't unmap on close(2). */ 144 if (munmap(p, fs->st_size) < 0) { 145 warn("%s", entp->fts_path); 146 rval = 1; 147 } 148 } 149 } else 150 #endif 151 { 152 int skipholes = 0; 153 struct stat tosb; 154 if (!fstat(to_fd, &tosb) && S_ISREG(tosb.st_mode)) 155 skipholes = 1; 156 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 157 if (skipholes && memcmp(buf, zeroes, rcount) == 0) 158 wcount = lseek(to_fd, rcount, SEEK_CUR) == -1 ? -1 : rcount; 159 else 160 wcount = write(to_fd, buf, rcount); 161 if (rcount != wcount || wcount == -1) { 162 warn("%s", to.p_path); 163 rval = 1; 164 break; 165 } 166 } 167 if (skipholes && rcount >= 0) 168 rcount = ftruncate(to_fd, fs->st_size); 169 if (rcount < 0) { 170 warn("%s", entp->fts_path); 171 rval = 1; 172 } 173 } 174 175 if (rval == 1) { 176 (void)close(from_fd); 177 (void)close(to_fd); 178 return (1); 179 } 180 181 if (pflag && setfile(fs, to_fd)) 182 rval = 1; 183 /* 184 * If the source was setuid or setgid, lose the bits unless the 185 * copy is owned by the same user and group. 186 */ 187 #define RETAINBITS \ 188 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 189 else if (fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) { 190 if (fstat(to_fd, &to_stat)) { 191 warn("%s", to.p_path); 192 rval = 1; 193 } else if (fs->st_gid == to_stat.st_gid && 194 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) { 195 warn("%s", to.p_path); 196 rval = 1; 197 } 198 } 199 (void)close(from_fd); 200 if (close(to_fd)) { 201 warn("%s", to.p_path); 202 rval = 1; 203 } 204 return (rval); 205 } 206 207 int 208 copy_link(FTSENT *p, int exists) 209 { 210 int len; 211 char link[MAXPATHLEN]; 212 213 if ((len = readlink(p->fts_path, link, sizeof(link)-1)) == -1) { 214 warn("readlink: %s", p->fts_path); 215 return (1); 216 } 217 link[len] = '\0'; 218 if (exists && unlink(to.p_path)) { 219 warn("unlink: %s", to.p_path); 220 return (1); 221 } 222 if (symlink(link, to.p_path)) { 223 warn("symlink: %s", link); 224 return (1); 225 } 226 return (pflag ? setlink(p->fts_statp) : 0); 227 } 228 229 int 230 copy_fifo(struct stat *from_stat, int exists) 231 { 232 if (exists && unlink(to.p_path)) { 233 warn("unlink: %s", to.p_path); 234 return (1); 235 } 236 if (mkfifo(to.p_path, from_stat->st_mode)) { 237 warn("mkfifo: %s", to.p_path); 238 return (1); 239 } 240 return (pflag ? setfile(from_stat, 0) : 0); 241 } 242 243 int 244 copy_special(struct stat *from_stat, int exists) 245 { 246 if (exists && unlink(to.p_path)) { 247 warn("unlink: %s", to.p_path); 248 return (1); 249 } 250 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 251 warn("mknod: %s", to.p_path); 252 return (1); 253 } 254 return (pflag ? setfile(from_stat, 0) : 0); 255 } 256 257 258 int 259 setfile(struct stat *fs, int fd) 260 { 261 static struct timeval tv[2]; 262 int rval; 263 264 rval = 0; 265 fs->st_mode &= S_ISTXT | S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO; 266 267 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 268 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 269 if (utimes(to.p_path, tv)) { 270 warn("utimes: %s", to.p_path); 271 rval = 1; 272 } 273 /* 274 * Changing the ownership probably won't succeed, unless we're root 275 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 276 * the mode; current BSD behavior is to remove all setuid bits on 277 * chown. If chown fails, lose setuid/setgid bits. 278 */ 279 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 280 chown(to.p_path, fs->st_uid, fs->st_gid)) { 281 if (errno != EPERM) { 282 warn("chown: %s", to.p_path); 283 rval = 1; 284 } 285 fs->st_mode &= ~(S_ISTXT | S_ISUID | S_ISGID); 286 } 287 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) { 288 warn("chmod: %s", to.p_path); 289 rval = 1; 290 } 291 292 /* 293 * XXX 294 * NFS doesn't support chflags; ignore errors unless there's reason 295 * to believe we're losing bits. (Note, this still won't be right 296 * if the server supports flags and we were trying to *remove* flags 297 * on a file that we copied, i.e., that we didn't create.) 298 */ 299 errno = 0; 300 if (fd ? fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) 301 if (errno != EOPNOTSUPP || fs->st_flags != 0) { 302 warn("chflags: %s", to.p_path); 303 rval = 1; 304 } 305 return (rval); 306 } 307 308 309 int 310 setlink(struct stat *fs) 311 { 312 313 if (lchown(to.p_path, fs->st_uid, fs->st_gid)) { 314 if (errno != EPERM) { 315 warn("lchown: %s", to.p_path); 316 return (1); 317 } 318 } 319 return (0); 320 } 321 322 323 void 324 usage(void) 325 { 326 (void)fprintf(stderr, 327 "usage: %s [-fip] [-R [-H | -L | -P]] source target\n", __progname); 328 (void)fprintf(stderr, 329 " %s [-fip] [-R [-H | -L | -P]] source ... directory\n", 330 __progname); 331 exit(1); 332 } 333