1 /* $OpenBSD: utils.c,v 1.34 2014/04/24 01:34:35 tedu 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 #include <sys/param.h> 34 #include <sys/stat.h> 35 #include <sys/mman.h> 36 #include <sys/time.h> 37 38 #include <err.h> 39 #include <errno.h> 40 #include <fcntl.h> 41 #include <fts.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 47 #include "extern.h" 48 49 int 50 copy_file(FTSENT *entp, int dne) 51 { 52 static char *buf; 53 static char *zeroes; 54 struct stat to_stat, *fs; 55 int ch, checkch, from_fd, rcount, rval, to_fd, wcount; 56 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 57 char *p; 58 #endif 59 60 if (!buf) { 61 buf = malloc(MAXBSIZE); 62 if (!buf) 63 err(1, "malloc"); 64 } 65 if (!zeroes) { 66 zeroes = calloc(1, MAXBSIZE); 67 if (!zeroes) 68 err(1, "calloc"); 69 } 70 71 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 72 warn("%s", entp->fts_path); 73 return (1); 74 } 75 76 fs = entp->fts_statp; 77 78 /* 79 * In -f (force) mode, we always unlink the destination first 80 * if it exists. Note that -i and -f are mutually exclusive. 81 */ 82 if (!dne && fflag) 83 (void)unlink(to.p_path); 84 85 /* 86 * If the file exists and we're interactive, verify with the user. 87 * If the file DNE, set the mode to be the from file, minus setuid 88 * bits, modified by the umask; arguably wrong, but it makes copying 89 * executables work right and it's been that way forever. (The 90 * other choice is 666 or'ed with the execute bits on the from file 91 * modified by the umask.) 92 */ 93 if (!dne && !fflag) { 94 if (iflag) { 95 (void)fprintf(stderr, "overwrite %s? ", to.p_path); 96 checkch = ch = getchar(); 97 while (ch != '\n' && ch != EOF) 98 ch = getchar(); 99 if (checkch != 'y' && checkch != 'Y') { 100 (void)close(from_fd); 101 return (0); 102 } 103 } 104 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 105 } else 106 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 107 fs->st_mode & ~(S_ISTXT | S_ISUID | S_ISGID)); 108 109 if (to_fd == -1) { 110 warn("%s", to.p_path); 111 (void)close(from_fd); 112 return (1); 113 } 114 115 rval = 0; 116 117 /* 118 * Mmap and write if less than 8M (the limit is so we don't totally 119 * trash memory on big files. This is really a minor hack, but it 120 * wins some CPU back. 121 */ 122 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 123 /* XXX broken for 0-size mmap */ 124 if (fs->st_size <= 8 * 1048576) { 125 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 126 MAP_FILE|MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) { 127 warn("mmap: %s", entp->fts_path); 128 rval = 1; 129 } else { 130 madvise(p, fs->st_size, MADV_SEQUENTIAL); 131 if (write(to_fd, p, fs->st_size) != fs->st_size) { 132 warn("%s", to.p_path); 133 rval = 1; 134 } 135 /* Some systems don't unmap on close(2). */ 136 if (munmap(p, fs->st_size) < 0) { 137 warn("%s", entp->fts_path); 138 rval = 1; 139 } 140 } 141 } else 142 #endif 143 { 144 int skipholes = 0; 145 struct stat tosb; 146 if (!fstat(to_fd, &tosb) && S_ISREG(tosb.st_mode)) 147 skipholes = 1; 148 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 149 if (skipholes && memcmp(buf, zeroes, rcount) == 0) 150 wcount = lseek(to_fd, rcount, SEEK_CUR) == -1 ? -1 : rcount; 151 else 152 wcount = write(to_fd, buf, rcount); 153 if (rcount != wcount || wcount == -1) { 154 warn("%s", to.p_path); 155 rval = 1; 156 break; 157 } 158 } 159 if (skipholes && rcount >= 0) 160 rcount = ftruncate(to_fd, lseek(to_fd, 0, SEEK_CUR)); 161 if (rcount < 0) { 162 warn("%s", entp->fts_path); 163 rval = 1; 164 } 165 } 166 167 if (rval == 1) { 168 (void)close(from_fd); 169 (void)close(to_fd); 170 return (1); 171 } 172 173 if (pflag && setfile(fs, to_fd)) 174 rval = 1; 175 /* 176 * If the source was setuid or setgid, lose the bits unless the 177 * copy is owned by the same user and group. 178 */ 179 #define RETAINBITS \ 180 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 181 if (!pflag && dne && 182 fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) { 183 if (fstat(to_fd, &to_stat)) { 184 warn("%s", to.p_path); 185 rval = 1; 186 } else if (fs->st_gid == to_stat.st_gid && 187 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) { 188 warn("%s", to.p_path); 189 rval = 1; 190 } 191 } 192 (void)close(from_fd); 193 if (close(to_fd)) { 194 warn("%s", to.p_path); 195 rval = 1; 196 } 197 return (rval); 198 } 199 200 int 201 copy_link(FTSENT *p, int exists) 202 { 203 int len; 204 char link[MAXPATHLEN]; 205 206 if ((len = readlink(p->fts_path, link, sizeof(link)-1)) == -1) { 207 warn("readlink: %s", p->fts_path); 208 return (1); 209 } 210 link[len] = '\0'; 211 if (exists && unlink(to.p_path)) { 212 warn("unlink: %s", to.p_path); 213 return (1); 214 } 215 if (symlink(link, to.p_path)) { 216 warn("symlink: %s", link); 217 return (1); 218 } 219 return (pflag ? setlink(p->fts_statp) : 0); 220 } 221 222 int 223 copy_fifo(struct stat *from_stat, int exists) 224 { 225 if (exists && unlink(to.p_path)) { 226 warn("unlink: %s", to.p_path); 227 return (1); 228 } 229 if (mkfifo(to.p_path, from_stat->st_mode)) { 230 warn("mkfifo: %s", to.p_path); 231 return (1); 232 } 233 return (pflag ? setfile(from_stat, 0) : 0); 234 } 235 236 int 237 copy_special(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 (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 244 warn("mknod: %s", to.p_path); 245 return (1); 246 } 247 return (pflag ? setfile(from_stat, 0) : 0); 248 } 249 250 251 int 252 setfile(struct stat *fs, int fd) 253 { 254 static struct timeval tv[2]; 255 int rval; 256 257 rval = 0; 258 fs->st_mode &= S_ISTXT | S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO; 259 260 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 261 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 262 if (utimes(to.p_path, tv)) { 263 warn("utimes: %s", to.p_path); 264 rval = 1; 265 } 266 /* 267 * Changing the ownership probably won't succeed, unless we're root 268 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 269 * the mode; current BSD behavior is to remove all setuid bits on 270 * chown. If chown fails, lose setuid/setgid bits. 271 */ 272 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) : 273 chown(to.p_path, fs->st_uid, fs->st_gid)) { 274 if (errno != EPERM) { 275 warn("chown: %s", to.p_path); 276 rval = 1; 277 } 278 fs->st_mode &= ~(S_ISTXT | S_ISUID | S_ISGID); 279 } 280 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) { 281 warn("chmod: %s", to.p_path); 282 rval = 1; 283 } 284 285 /* 286 * XXX 287 * NFS doesn't support chflags; ignore errors unless there's reason 288 * to believe we're losing bits. (Note, this still won't be right 289 * if the server supports flags and we were trying to *remove* flags 290 * on a file that we copied, i.e., that we didn't create.) 291 */ 292 errno = 0; 293 if (fd ? fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) 294 if (errno != EOPNOTSUPP || fs->st_flags != 0) { 295 warn("chflags: %s", to.p_path); 296 rval = 1; 297 } 298 return (rval); 299 } 300 301 302 int 303 setlink(struct stat *fs) 304 { 305 306 if (lchown(to.p_path, fs->st_uid, fs->st_gid)) { 307 if (errno != EPERM) { 308 warn("lchown: %s", to.p_path); 309 return (1); 310 } 311 } 312 return (0); 313 } 314 315 316 void 317 usage(void) 318 { 319 (void)fprintf(stderr, 320 "usage: %s [-fip] [-R [-H | -L | -P]] source target\n", __progname); 321 (void)fprintf(stderr, 322 " %s [-fip] [-R [-H | -L | -P]] source ... directory\n", 323 __progname); 324 exit(1); 325 } 326