1 /* $NetBSD: utils.c,v 1.29 2005/10/15 18:22:18 christos 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 1.29 2005/10/15 18:22:18 christos 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 size_t fsize = (size_t)fs->st_size; 145 p = mmap(NULL, fsize, PROT_READ, MAP_FILE|MAP_SHARED, 146 from_fd, (off_t)0); 147 if (p == MAP_FAILED) { 148 goto mmap_failed; 149 } else { 150 (void) madvise(p, (size_t)fs->st_size, 151 MADV_SEQUENTIAL); 152 if (write(to_fd, p, fsize) != 153 fs->st_size) { 154 warn("%s", to.p_path); 155 rval = 1; 156 } 157 if (munmap(p, fsize) < 0) { 158 warn("%s", entp->fts_path); 159 rval = 1; 160 } 161 } 162 } else { 163 mmap_failed: 164 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 165 wcount = write(to_fd, buf, (size_t)rcount); 166 if (rcount != wcount || wcount == -1) { 167 warn("%s", to.p_path); 168 rval = 1; 169 break; 170 } 171 } 172 if (rcount < 0) { 173 warn("%s", entp->fts_path); 174 rval = 1; 175 } 176 } 177 } 178 179 if (rval == 1) { 180 (void)close(from_fd); 181 (void)close(to_fd); 182 return (1); 183 } 184 185 if (pflag && setfile(fs, to_fd)) 186 rval = 1; 187 /* 188 * If the source was setuid or setgid, lose the bits unless the 189 * copy is owned by the same user and group. 190 */ 191 #define RETAINBITS \ 192 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 193 else if (fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) { 194 if (fstat(to_fd, &to_stat)) { 195 warn("%s", to.p_path); 196 rval = 1; 197 } else if (fs->st_gid == to_stat.st_gid && 198 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) { 199 warn("%s", to.p_path); 200 rval = 1; 201 } 202 } 203 (void)close(from_fd); 204 if (close(to_fd)) { 205 warn("%s", to.p_path); 206 rval = 1; 207 } 208 /* set the mod/access times now after close of the fd */ 209 if (pflag && set_utimes(to.p_path, fs)) { 210 rval = 1; 211 } 212 return (rval); 213 } 214 215 int 216 copy_link(FTSENT *p, int exists) 217 { 218 int len; 219 char target[MAXPATHLEN]; 220 221 if ((len = readlink(p->fts_path, target, sizeof(target)-1)) == -1) { 222 warn("readlink: %s", p->fts_path); 223 return (1); 224 } 225 target[len] = '\0'; 226 if (exists && unlink(to.p_path)) { 227 warn("unlink: %s", to.p_path); 228 return (1); 229 } 230 if (symlink(target, to.p_path)) { 231 warn("symlink: %s", target); 232 return (1); 233 } 234 return (pflag ? setfile(p->fts_statp, 0) : 0); 235 } 236 237 int 238 copy_fifo(struct stat *from_stat, int exists) 239 { 240 if (exists && unlink(to.p_path)) { 241 warn("unlink: %s", to.p_path); 242 return (1); 243 } 244 if (mkfifo(to.p_path, from_stat->st_mode)) { 245 warn("mkfifo: %s", to.p_path); 246 return (1); 247 } 248 return (pflag ? setfile(from_stat, 0) : 0); 249 } 250 251 int 252 copy_special(struct stat *from_stat, int exists) 253 { 254 if (exists && unlink(to.p_path)) { 255 warn("unlink: %s", to.p_path); 256 return (1); 257 } 258 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 259 warn("mknod: %s", to.p_path); 260 return (1); 261 } 262 return (pflag ? setfile(from_stat, 0) : 0); 263 } 264 265 266 /* 267 * Function: setfile 268 * 269 * Purpose: 270 * Set the owner/group/permissions for the "to" file to the information 271 * in the stat structure. If fd is zero, also call set_utimes() to set 272 * the mod/access times. If fd is non-zero, the caller must do a utimes 273 * itself after close(fd). 274 */ 275 int 276 setfile(struct stat *fs, int fd) 277 { 278 int rval, islink; 279 280 rval = 0; 281 islink = S_ISLNK(fs->st_mode); 282 fs->st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO; 283 284 /* 285 * Changing the ownership probably won't succeed, unless we're root 286 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 287 * the mode; current BSD behavior is to remove all setuid bits on 288 * chown. If chown fails, lose setuid/setgid bits. 289 */ 290 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 291 lchown(to.p_path, fs->st_uid, fs->st_gid)) { 292 if (errno != EPERM) { 293 warn("chown: %s", to.p_path); 294 rval = 1; 295 } 296 fs->st_mode &= ~(S_ISUID | S_ISGID); 297 } 298 if (fd ? fchmod(fd, fs->st_mode) : lchmod(to.p_path, fs->st_mode)) { 299 warn("chmod: %s", to.p_path); 300 rval = 1; 301 } 302 303 if (!islink && !Nflag) { 304 unsigned long fflags = fs->st_flags; 305 /* 306 * XXX 307 * NFS doesn't support chflags; ignore errors unless 308 * there's reason to believe we're losing bits. 309 * (Note, this still won't be right if the server 310 * supports flags and we were trying to *remove* flags 311 * on a file that we copied, i.e., that we didn't create.) 312 */ 313 errno = 0; 314 if ((fd ? fchflags(fd, fflags) : 315 chflags(to.p_path, fflags)) == -1) 316 if (errno != EOPNOTSUPP || fs->st_flags != 0) { 317 warn("chflags: %s", to.p_path); 318 rval = 1; 319 } 320 } 321 /* if fd is non-zero, caller must call set_utimes() after close() */ 322 if (fd == 0 && set_utimes(to.p_path, fs)) 323 rval = 1; 324 return (rval); 325 } 326 327 void 328 usage(void) 329 { 330 (void)fprintf(stderr, 331 "usage: %s [-R [-H | -L | -P]] [-f | -i] [-pv] src target\n" 332 " %s [-R [-H | -L | -P]] [-f | -i] [-pv] src1 ... srcN directory\n", 333 getprogname(), getprogname()); 334 exit(1); 335 /* NOTREACHED */ 336 } 337