1 /* $OpenBSD: utils.c,v 1.40 2017/06/27 21:43:46 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> /* MAXBSIZE */ 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 #include <limits.h> 47 48 #include "extern.h" 49 50 int 51 copy_file(FTSENT *entp, int dne) 52 { 53 static char *buf; 54 static char *zeroes; 55 struct stat to_stat, *fs; 56 int ch, checkch, from_fd, rcount, rval, to_fd, wcount; 57 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 58 char *p; 59 #endif 60 61 if (!buf) { 62 buf = malloc(MAXBSIZE); 63 if (!buf) 64 err(1, "malloc"); 65 } 66 if (!zeroes) { 67 zeroes = calloc(1, MAXBSIZE); 68 if (!zeroes) 69 err(1, "calloc"); 70 } 71 72 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 73 warn("%s", entp->fts_path); 74 return (1); 75 } 76 77 fs = entp->fts_statp; 78 79 /* 80 * In -f (force) mode, we always unlink the destination first 81 * if it exists. Note that -i and -f are mutually exclusive. 82 */ 83 if (!dne && fflag) 84 (void)unlink(to.p_path); 85 86 /* 87 * If the file exists and we're interactive, verify with the user. 88 * If the file DNE, set the mode to be the from file, minus setuid 89 * bits, modified by the umask; arguably wrong, but it makes copying 90 * executables work right and it's been that way forever. (The 91 * other choice is 666 or'ed with the execute bits on the from file 92 * modified by the umask.) 93 */ 94 if (!dne && !fflag) { 95 if (iflag) { 96 (void)fprintf(stderr, "overwrite %s? ", to.p_path); 97 checkch = ch = getchar(); 98 while (ch != '\n' && ch != EOF) 99 ch = getchar(); 100 if (checkch != 'y' && checkch != 'Y') { 101 (void)close(from_fd); 102 return (0); 103 } 104 } 105 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 106 } else 107 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 108 fs->st_mode & ~(S_ISTXT | S_ISUID | S_ISGID)); 109 110 if (to_fd == -1) { 111 warn("%s", to.p_path); 112 (void)close(from_fd); 113 return (1); 114 } 115 116 rval = 0; 117 118 /* 119 * Mmap and write if less than 8M (the limit is so we don't totally 120 * trash memory on big files. This is really a minor hack, but it 121 * wins some CPU back. 122 */ 123 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 124 /* XXX broken for 0-size mmap */ 125 if (fs->st_size <= 8 * 1048576) { 126 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 127 MAP_FILE|MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) { 128 warn("mmap: %s", entp->fts_path); 129 rval = 1; 130 } else { 131 madvise(p, fs->st_size, MADV_SEQUENTIAL); 132 if (write(to_fd, p, fs->st_size) != fs->st_size) { 133 warn("%s", to.p_path); 134 rval = 1; 135 } 136 /* Some systems don't unmap on close(2). */ 137 if (munmap(p, fs->st_size) < 0) { 138 warn("%s", entp->fts_path); 139 rval = 1; 140 } 141 } 142 } else 143 #endif 144 { 145 int skipholes = 0; 146 struct stat tosb; 147 if (!fstat(to_fd, &tosb) && S_ISREG(tosb.st_mode)) 148 skipholes = 1; 149 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 150 if (skipholes && memcmp(buf, zeroes, rcount) == 0) 151 wcount = lseek(to_fd, rcount, SEEK_CUR) == -1 ? -1 : rcount; 152 else 153 wcount = write(to_fd, buf, rcount); 154 if (rcount != wcount || wcount == -1) { 155 warn("%s", to.p_path); 156 rval = 1; 157 break; 158 } 159 } 160 if (skipholes && rcount >= 0) 161 rcount = ftruncate(to_fd, lseek(to_fd, 0, SEEK_CUR)); 162 if (rcount < 0) { 163 warn("%s", entp->fts_path); 164 rval = 1; 165 } 166 } 167 168 if (rval == 1) { 169 (void)close(from_fd); 170 (void)close(to_fd); 171 return (1); 172 } 173 174 if (pflag && setfile(fs, to_fd)) 175 rval = 1; 176 /* 177 * If the source was setuid or setgid, lose the bits unless the 178 * copy is owned by the same user and group. 179 */ 180 #define RETAINBITS \ 181 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 182 if (!pflag && dne && 183 fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) { 184 if (fstat(to_fd, &to_stat)) { 185 warn("%s", to.p_path); 186 rval = 1; 187 } else if (fs->st_gid == to_stat.st_gid && 188 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) { 189 warn("%s", to.p_path); 190 rval = 1; 191 } 192 } 193 (void)close(from_fd); 194 if (close(to_fd)) { 195 warn("%s", to.p_path); 196 rval = 1; 197 } 198 return (rval); 199 } 200 201 int 202 copy_link(FTSENT *p, int exists) 203 { 204 int len; 205 char name[PATH_MAX]; 206 207 if ((len = readlink(p->fts_path, name, sizeof(name)-1)) == -1) { 208 warn("readlink: %s", p->fts_path); 209 return (1); 210 } 211 name[len] = '\0'; 212 if (exists && unlink(to.p_path)) { 213 warn("unlink: %s", to.p_path); 214 return (1); 215 } 216 if (symlink(name, to.p_path)) { 217 warn("symlink: %s", name); 218 return (1); 219 } 220 return (pflag ? setfile(p->fts_statp, -1) : 0); 221 } 222 223 int 224 copy_fifo(struct stat *from_stat, int exists) 225 { 226 if (exists && unlink(to.p_path)) { 227 warn("unlink: %s", to.p_path); 228 return (1); 229 } 230 if (mkfifo(to.p_path, from_stat->st_mode)) { 231 warn("mkfifo: %s", to.p_path); 232 return (1); 233 } 234 return (pflag ? setfile(from_stat, -1) : 0); 235 } 236 237 int 238 copy_special(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 (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 245 warn("mknod: %s", to.p_path); 246 return (1); 247 } 248 return (pflag ? setfile(from_stat, -1) : 0); 249 } 250 251 252 int 253 setfile(struct stat *fs, int fd) 254 { 255 struct timespec ts[2]; 256 int rval; 257 258 rval = 0; 259 fs->st_mode &= S_ISTXT | S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO; 260 261 ts[0] = fs->st_atim; 262 ts[1] = fs->st_mtim; 263 if (fd >= 0 ? futimens(fd, ts) : 264 utimensat(AT_FDCWD, to.p_path, ts, AT_SYMLINK_NOFOLLOW)) { 265 warn("update times: %s", to.p_path); 266 rval = 1; 267 } 268 /* 269 * Changing the ownership probably won't succeed, unless we're root 270 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 271 * the mode; current BSD behavior is to remove all setuid bits on 272 * chown. If chown fails, lose setuid/setgid bits. 273 */ 274 if (fd >= 0 ? fchown(fd, fs->st_uid, fs->st_gid) : 275 lchown(to.p_path, fs->st_uid, fs->st_gid)) { 276 if (errno != EPERM) { 277 warn("chown: %s", to.p_path); 278 rval = 1; 279 } 280 fs->st_mode &= ~(S_ISTXT | S_ISUID | S_ISGID); 281 } 282 if (fd >= 0 ? fchmod(fd, fs->st_mode) : 283 fchmodat(AT_FDCWD, to.p_path, fs->st_mode, AT_SYMLINK_NOFOLLOW)) { 284 warn("chmod: %s", to.p_path); 285 rval = 1; 286 } 287 288 /* 289 * XXX 290 * NFS doesn't support chflags; ignore errors unless there's reason 291 * to believe we're losing bits. (Note, this still won't be right 292 * if the server supports flags and we were trying to *remove* flags 293 * on a file that we copied, i.e., that we didn't create.) 294 */ 295 errno = 0; 296 if (fd >= 0 ? fchflags(fd, fs->st_flags) : 297 chflagsat(AT_FDCWD, to.p_path, fs->st_flags, AT_SYMLINK_NOFOLLOW)) 298 if (errno != EOPNOTSUPP || fs->st_flags != 0) { 299 warn("chflags: %s", to.p_path); 300 rval = 1; 301 } 302 return (rval); 303 } 304 305 306 void 307 usage(void) 308 { 309 (void)fprintf(stderr, 310 "usage: %s [-fipv] [-R [-H | -L | -P]] source target\n", __progname); 311 (void)fprintf(stderr, 312 " %s [-fipv] [-R [-H | -L | -P]] source ... directory\n", 313 __progname); 314 exit(1); 315 } 316