utils.c revision 1.34
1 /* $NetBSD: utils.c,v 1.34 2007/10/26 16:21:25 hira 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 1.34 2007/10/26 16:21:25 hira 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, tolnk, 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 to_fd = -1; 86 fs = entp->fts_statp; 87 tolnk = ((Rflag && !(Lflag || Hflag)) || Pflag); 88 89 /* 90 * If the file exists and we're interactive, verify with the user. 91 * If the file DNE, set the mode to be the from file, minus setuid 92 * bits, modified by the umask; arguably wrong, but it makes copying 93 * executables work right and it's been that way forever. (The 94 * other choice is 666 or'ed with the execute bits on the from file 95 * modified by the umask.) 96 */ 97 if (!dne) { 98 struct stat sb; 99 int sval; 100 101 if (iflag) { 102 (void)fprintf(stderr, "overwrite %s? ", to.p_path); 103 checkch = ch = getchar(); 104 while (ch != '\n' && ch != EOF) 105 ch = getchar(); 106 if (checkch != 'y' && checkch != 'Y') { 107 (void)close(from_fd); 108 return (0); 109 } 110 } 111 112 sval = tolnk ? 113 lstat(to.p_path, &sb) : stat(to.p_path, &sb); 114 if (sval == -1) { 115 warn("stat: %s", to.p_path); 116 return (1); 117 } 118 119 if (!(tolnk && S_ISLNK(sb.st_mode))) 120 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 121 } else 122 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 123 fs->st_mode & ~(S_ISUID | S_ISGID)); 124 125 if (to_fd == -1 && (fflag || tolnk)) { 126 /* 127 * attempt to remove existing destination file name and 128 * create a new file 129 */ 130 (void)unlink(to.p_path); 131 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 132 fs->st_mode & ~(S_ISUID | S_ISGID)); 133 } 134 135 if (to_fd == -1) { 136 warn("%s", to.p_path); 137 (void)close(from_fd); 138 return (1); 139 } 140 141 rval = 0; 142 143 /* 144 * There's no reason to do anything other than close the file 145 * now if it's empty, so let's not bother. 146 */ 147 148 if (fs->st_size > 0) { 149 150 /* 151 * Mmap and write if less than 8M (the limit is so 152 * we don't totally trash memory on big files). 153 * This is really a minor hack, but it wins some CPU back. 154 */ 155 156 if (fs->st_size <= 8 * 1048576) { 157 size_t fsize = (size_t)fs->st_size; 158 p = mmap(NULL, fsize, PROT_READ, MAP_FILE|MAP_SHARED, 159 from_fd, (off_t)0); 160 if (p == MAP_FAILED) { 161 goto mmap_failed; 162 } else { 163 (void) madvise(p, (size_t)fs->st_size, 164 MADV_SEQUENTIAL); 165 if (write(to_fd, p, fsize) != 166 fs->st_size) { 167 warn("%s", to.p_path); 168 rval = 1; 169 } 170 if (munmap(p, fsize) < 0) { 171 warn("%s", entp->fts_path); 172 rval = 1; 173 } 174 } 175 } else { 176 mmap_failed: 177 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 178 wcount = write(to_fd, buf, (size_t)rcount); 179 if (rcount != wcount || wcount == -1) { 180 warn("%s", to.p_path); 181 rval = 1; 182 break; 183 } 184 } 185 if (rcount < 0) { 186 warn("%s", entp->fts_path); 187 rval = 1; 188 } 189 } 190 } 191 192 if (rval == 1) { 193 (void)close(from_fd); 194 (void)close(to_fd); 195 return (1); 196 } 197 198 if (pflag && setfile(fs, to_fd)) 199 rval = 1; 200 /* 201 * If the source was setuid or setgid, lose the bits unless the 202 * copy is owned by the same user and group. 203 */ 204 #define RETAINBITS \ 205 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 206 if (!pflag && dne 207 && fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) { 208 if (fstat(to_fd, &to_stat)) { 209 warn("%s", to.p_path); 210 rval = 1; 211 } else if (fs->st_gid == to_stat.st_gid && 212 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) { 213 warn("%s", to.p_path); 214 rval = 1; 215 } 216 } 217 (void)close(from_fd); 218 if (close(to_fd)) { 219 warn("%s", to.p_path); 220 rval = 1; 221 } 222 /* set the mod/access times now after close of the fd */ 223 if (pflag && set_utimes(to.p_path, fs)) { 224 rval = 1; 225 } 226 return (rval); 227 } 228 229 int 230 copy_link(FTSENT *p, int exists) 231 { 232 int len; 233 char target[MAXPATHLEN]; 234 235 if ((len = readlink(p->fts_path, target, sizeof(target)-1)) == -1) { 236 warn("readlink: %s", p->fts_path); 237 return (1); 238 } 239 target[len] = '\0'; 240 if (exists && unlink(to.p_path)) { 241 warn("unlink: %s", to.p_path); 242 return (1); 243 } 244 if (symlink(target, to.p_path)) { 245 warn("symlink: %s", target); 246 return (1); 247 } 248 return (pflag ? setfile(p->fts_statp, 0) : 0); 249 } 250 251 int 252 copy_fifo(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 (mkfifo(to.p_path, from_stat->st_mode)) { 259 warn("mkfifo: %s", to.p_path); 260 return (1); 261 } 262 return (pflag ? setfile(from_stat, 0) : 0); 263 } 264 265 int 266 copy_special(struct stat *from_stat, int exists) 267 { 268 if (exists && unlink(to.p_path)) { 269 warn("unlink: %s", to.p_path); 270 return (1); 271 } 272 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 273 warn("mknod: %s", to.p_path); 274 return (1); 275 } 276 return (pflag ? setfile(from_stat, 0) : 0); 277 } 278 279 280 /* 281 * Function: setfile 282 * 283 * Purpose: 284 * Set the owner/group/permissions for the "to" file to the information 285 * in the stat structure. If fd is zero, also call set_utimes() to set 286 * the mod/access times. If fd is non-zero, the caller must do a utimes 287 * itself after close(fd). 288 */ 289 int 290 setfile(struct stat *fs, int fd) 291 { 292 int rval, islink; 293 294 rval = 0; 295 islink = S_ISLNK(fs->st_mode); 296 fs->st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO; 297 298 /* 299 * Changing the ownership probably won't succeed, unless we're root 300 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 301 * the mode; current BSD behavior is to remove all setuid bits on 302 * chown. If chown fails, lose setuid/setgid bits. 303 */ 304 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 305 lchown(to.p_path, fs->st_uid, fs->st_gid)) { 306 if (errno != EPERM) { 307 warn("chown: %s", to.p_path); 308 rval = 1; 309 } 310 fs->st_mode &= ~(S_ISUID | S_ISGID); 311 } 312 if (fd ? fchmod(fd, fs->st_mode) : lchmod(to.p_path, fs->st_mode)) { 313 warn("chmod: %s", to.p_path); 314 rval = 1; 315 } 316 317 if (!islink && !Nflag) { 318 unsigned long fflags = fs->st_flags; 319 /* 320 * XXX 321 * NFS doesn't support chflags; ignore errors unless 322 * there's reason to believe we're losing bits. 323 * (Note, this still won't be right if the server 324 * supports flags and we were trying to *remove* flags 325 * on a file that we copied, i.e., that we didn't create.) 326 */ 327 errno = 0; 328 if ((fd ? fchflags(fd, fflags) : 329 chflags(to.p_path, fflags)) == -1) 330 if (errno != EOPNOTSUPP || fs->st_flags != 0) { 331 warn("chflags: %s", to.p_path); 332 rval = 1; 333 } 334 } 335 /* if fd is non-zero, caller must call set_utimes() after close() */ 336 if (fd == 0 && set_utimes(to.p_path, fs)) 337 rval = 1; 338 return (rval); 339 } 340 341 void 342 usage(void) 343 { 344 (void)fprintf(stderr, 345 "usage: %s [-R [-H | -L | -P]] [-f | -i] [-Npv] src target\n" 346 " %s [-R [-H | -L | -P]] [-f | -i] [-Npv] src1 ... srcN directory\n", 347 getprogname(), getprogname()); 348 exit(1); 349 /* NOTREACHED */ 350 } 351
Indexes created Mon Sep 22 05:09:51 GMT 2025