1 /* $NetBSD: utils.c,v 1.27 2004/01/04 16:04:18 jschauma 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)utils.c 8.3 (Berkeley) 4/1/94"; 36 #else 37 __RCSID("$NetBSD: utils.c,v 1.27 2004/01/04 16:04:18 jschauma Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 #include <sys/mman.h> 42 #include <sys/param.h> 43 #include <sys/stat.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 set_utimes(const char *file, struct stat *fs) 59 { 60 static struct timeval tv[2]; 61 62 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 63 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 64 65 if (lutimes(file, tv)) { 66 warn("lutimes: %s", file); 67 return (1); 68 } 69 return (0); 70 } 71 72 int 73 copy_file(FTSENT *entp, int dne) 74 { 75 static char buf[MAXBSIZE]; 76 struct stat to_stat, *fs; 77 int ch, checkch, from_fd, rcount, rval, to_fd, wcount; 78 char *p; 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 * If the file exists and we're interactive, verify with the user. 89 * If the file DNE, set the mode to be the from file, minus setuid 90 * bits, modified by the umask; arguably wrong, but it makes copying 91 * executables work right and it's been that way forever. (The 92 * other choice is 666 or'ed with the execute bits on the from file 93 * modified by the umask.) 94 */ 95 if (!dne) { 96 if (iflag) { 97 (void)fprintf(stderr, "overwrite %s? ", to.p_path); 98 checkch = ch = getchar(); 99 while (ch != '\n' && ch != EOF) 100 ch = getchar(); 101 if (checkch != 'y' && checkch != 'Y') { 102 (void)close(from_fd); 103 return (0); 104 } 105 } 106 /* overwrite existing destination file name */ 107 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 108 } else 109 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 110 fs->st_mode & ~(S_ISUID | S_ISGID)); 111 112 if (to_fd == -1 && fflag) { 113 /* 114 * attempt to remove existing destination file name and 115 * create a new file 116 */ 117 (void)unlink(to.p_path); 118 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 119 fs->st_mode & ~(S_ISUID | S_ISGID)); 120 } 121 122 if (to_fd == -1) { 123 warn("%s", to.p_path); 124 (void)close(from_fd); 125 return (1); 126 } 127 128 rval = 0; 129 130 /* 131 * There's no reason to do anything other than close the file 132 * now if it's empty, so let's not bother. 133 */ 134 135 if (fs->st_size > 0) { 136 137 /* 138 * Mmap and write if less than 8M (the limit is so 139 * we don't totally trash memory on big files). 140 * This is really a minor hack, but it wins some CPU back. 141 */ 142 143 if (fs->st_size <= 8 * 1048576) { 144 p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 145 MAP_FILE|MAP_SHARED, from_fd, (off_t)0); 146 if (p == MAP_FAILED) { 147 goto mmap_failed; 148 } else { 149 (void) madvise(p, (size_t)fs->st_size, 150 MADV_SEQUENTIAL); 151 if (write(to_fd, p, fs->st_size) != 152 fs->st_size) { 153 warn("%s", to.p_path); 154 rval = 1; 155 } 156 if (munmap(p, fs->st_size) < 0) { 157 warn("%s", entp->fts_path); 158 rval = 1; 159 } 160 } 161 } else { 162 mmap_failed: 163 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 164 wcount = write(to_fd, buf, rcount); 165 if (rcount != wcount || wcount == -1) { 166 warn("%s", to.p_path); 167 rval = 1; 168 break; 169 } 170 } 171 if (rcount < 0) { 172 warn("%s", entp->fts_path); 173 rval = 1; 174 } 175 } 176 } 177 178 if (rval == 1) { 179 (void)close(from_fd); 180 (void)close(to_fd); 181 return (1); 182 } 183 184 if (pflag && setfile(fs, to_fd)) 185 rval = 1; 186 /* 187 * If the source was setuid or setgid, lose the bits unless the 188 * copy is owned by the same user and group. 189 */ 190 #define RETAINBITS \ 191 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 192 else if (fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) { 193 if (fstat(to_fd, &to_stat)) { 194 warn("%s", to.p_path); 195 rval = 1; 196 } else if (fs->st_gid == to_stat.st_gid && 197 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) { 198 warn("%s", to.p_path); 199 rval = 1; 200 } 201 } 202 (void)close(from_fd); 203 if (close(to_fd)) { 204 warn("%s", to.p_path); 205 rval = 1; 206 } 207 /* set the mod/access times now after close of the fd */ 208 if (pflag && set_utimes(to.p_path, fs)) { 209 rval = 1; 210 } 211 return (rval); 212 } 213 214 int 215 copy_link(FTSENT *p, int exists) 216 { 217 int len; 218 char target[MAXPATHLEN]; 219 220 if ((len = readlink(p->fts_path, target, sizeof(target)-1)) == -1) { 221 warn("readlink: %s", p->fts_path); 222 return (1); 223 } 224 target[len] = '\0'; 225 if (exists && unlink(to.p_path)) { 226 warn("unlink: %s", to.p_path); 227 return (1); 228 } 229 if (symlink(target, to.p_path)) { 230 warn("symlink: %s", target); 231 return (1); 232 } 233 return (pflag ? setfile(p->fts_statp, 0) : 0); 234 } 235 236 int 237 copy_fifo(struct stat *from_stat, int exists) 238 { 239 if (exists && unlink(to.p_path)) { 240 warn("unlink: %s", to.p_path); 241 return (1); 242 } 243 if (mkfifo(to.p_path, from_stat->st_mode)) { 244 warn("mkfifo: %s", to.p_path); 245 return (1); 246 } 247 return (pflag ? setfile(from_stat, 0) : 0); 248 } 249 250 int 251 copy_special(struct stat *from_stat, int exists) 252 { 253 if (exists && unlink(to.p_path)) { 254 warn("unlink: %s", to.p_path); 255 return (1); 256 } 257 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 258 warn("mknod: %s", to.p_path); 259 return (1); 260 } 261 return (pflag ? setfile(from_stat, 0) : 0); 262 } 263 264 265 /* 266 * Function: setfile 267 * 268 * Purpose: 269 * Set the owner/group/permissions for the "to" file to the information 270 * in the stat structure. If fd is zero, also call set_utimes() to set 271 * the mod/access times. If fd is non-zero, the caller must do a utimes 272 * itself after close(fd). 273 */ 274 int 275 setfile(struct stat *fs, int fd) 276 { 277 int rval, islink; 278 279 rval = 0; 280 islink = S_ISLNK(fs->st_mode); 281 fs->st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO; 282 283 /* 284 * Changing the ownership probably won't succeed, unless we're root 285 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 286 * the mode; current BSD behavior is to remove all setuid bits on 287 * chown. If chown fails, lose setuid/setgid bits. 288 */ 289 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 290 lchown(to.p_path, fs->st_uid, fs->st_gid)) { 291 if (errno != EPERM) { 292 warn("chown: %s", to.p_path); 293 rval = 1; 294 } 295 fs->st_mode &= ~(S_ISUID | S_ISGID); 296 } 297 if (fd ? fchmod(fd, fs->st_mode) : lchmod(to.p_path, fs->st_mode)) { 298 warn("chmod: %s", to.p_path); 299 rval = 1; 300 } 301 302 if (!islink) { 303 /* 304 * XXX 305 * NFS doesn't support chflags; ignore errors unless 306 * there's reason to believe we're losing bits. 307 * (Note, this still won't be right if the server 308 * supports flags and we were trying to *remove* flags 309 * on a file that we copied, i.e., that we didn't create.) 310 */ 311 errno = 0; 312 if (fd ? fchflags(fd, fs->st_flags) : 313 chflags(to.p_path, fs->st_flags)) 314 if (errno != EOPNOTSUPP || fs->st_flags != 0) { 315 warn("chflags: %s", to.p_path); 316 rval = 1; 317 } 318 } 319 /* if fd is non-zero, caller must call set_utimes() after close() */ 320 if (fd == 0 && set_utimes(to.p_path, fs)) 321 rval = 1; 322 return (rval); 323 } 324 325 void 326 usage(void) 327 { 328 (void)fprintf(stderr, 329 "usage: %s [-R [-H | -L | -P]] [-f | -i] [-pv] src target\n" 330 " %s [-R [-H | -L | -P]] [-f | -i] [-pv] src1 ... srcN directory\n", 331 getprogname(), getprogname()); 332 exit(1); 333 /* NOTREACHED */ 334 } 335