Commit | Line | Data |
---|---|---|
0f78b815 | 1 | /* |
ded8347d MP |
2 | * Syscall wrappers to ensure that nothing gets done in dry_run mode |
3 | * and to handle system peculiarities. | |
0f78b815 WD |
4 | * |
5 | * Copyright (C) 1998 Andrew Tridgell | |
6 | * Copyright (C) 2002 Martin Pool | |
b3bf9b9d | 7 | * Copyright (C) 2003-2009 Wayne Davison |
0f78b815 WD |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify | |
8e41b68e WD |
10 | * it under the terms of the GNU General Public License as published by |
11 | * the Free Software Foundation; either version 3 of the License, or | |
12 | * (at your option) any later version. | |
0f78b815 WD |
13 | * |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
e7c67065 | 19 | * You should have received a copy of the GNU General Public License along |
4fd842f9 | 20 | * with this program; if not, visit the http://fsf.org website. |
0f78b815 | 21 | */ |
31e12522 AT |
22 | |
23 | #include "rsync.h" | |
24 | ||
4f5b0756 | 25 | #if !defined MKNOD_CREATES_SOCKETS && defined HAVE_SYS_UN_H |
da6eb9d1 WD |
26 | #include <sys/un.h> |
27 | #endif | |
11b02d92 WD |
28 | #ifdef HAVE_SYS_ATTR_H |
29 | #include <sys/attr.h> | |
30 | #endif | |
da6eb9d1 | 31 | |
28b519c9 WD |
32 | #if defined HAVE_SYS_FALLOCATE && !defined HAVE_FALLOCATE |
33 | #include <sys/syscall.h> | |
34 | #endif | |
35 | ||
31e12522 | 36 | extern int dry_run; |
9439c0cb | 37 | extern int am_root; |
6e310d38 | 38 | extern int am_sender; |
f0fca04e | 39 | extern int read_only; |
2b086e03 | 40 | extern int list_only; |
f0b4fdaf | 41 | extern int preserve_perms; |
e35ad79b | 42 | extern int preserve_executability; |
f0fca04e | 43 | |
cfeed4da WD |
44 | #define RETURN_ERROR_IF(x,e) \ |
45 | do { \ | |
46 | if (x) { \ | |
47 | errno = (e); \ | |
48 | return -1; \ | |
49 | } \ | |
50 | } while (0) | |
51 | ||
52 | #define RETURN_ERROR_IF_RO_OR_LO RETURN_ERROR_IF(read_only || list_only, EROFS) | |
31e12522 | 53 | |
63cf5ae7 | 54 | int do_unlink(const char *fname) |
31e12522 AT |
55 | { |
56 | if (dry_run) return 0; | |
cfeed4da | 57 | RETURN_ERROR_IF_RO_OR_LO; |
31e12522 AT |
58 | return unlink(fname); |
59 | } | |
60 | ||
8e15bd87 WD |
61 | #ifdef SUPPORT_LINKS |
62 | int do_symlink(const char *lnk, const char *fname) | |
31e12522 AT |
63 | { |
64 | if (dry_run) return 0; | |
cfeed4da | 65 | RETURN_ERROR_IF_RO_OR_LO; |
6e310d38 | 66 | |
e2c1e482 | 67 | #if defined NO_SYMLINK_XATTRS || defined NO_SYMLINK_USER_XATTRS |
6e310d38 WD |
68 | /* For --fake-super, we create a normal file with mode 0600 |
69 | * and write the lnk into it. */ | |
70 | if (am_root < 0) { | |
71 | int ok, len = strlen(lnk); | |
72 | int fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, S_IWUSR|S_IRUSR); | |
73 | if (fd < 0) | |
74 | return -1; | |
75 | ok = write(fd, lnk, len) == len; | |
76 | if (close(fd) < 0) | |
77 | ok = 0; | |
78 | return ok ? 0 : -1; | |
79 | } | |
80 | #endif | |
81 | ||
8e15bd87 | 82 | return symlink(lnk, fname); |
31e12522 | 83 | } |
6e310d38 | 84 | |
a59a7b24 | 85 | #if defined NO_SYMLINK_XATTRS || defined NO_SYMLINK_USER_XATTRS |
6e310d38 WD |
86 | ssize_t do_readlink(const char *path, char *buf, size_t bufsiz) |
87 | { | |
88 | /* For --fake-super, we read the link from the file. */ | |
89 | if (am_root < 0) { | |
90 | int fd = open(path, O_RDONLY|O_NOFOLLOW); | |
91 | if (fd >= 0) { | |
92 | int len = read(fd, buf, bufsiz); | |
93 | close(fd); | |
94 | return len; | |
95 | } | |
96 | if (errno != ELOOP) | |
97 | return -1; | |
98 | /* A real symlink needs to be turned into a fake one on the receiving | |
99 | * side, so tell the generator that the link has no length. */ | |
100 | if (!am_sender) | |
101 | return 0; | |
102 | /* Otherwise fall through and let the sender report the real length. */ | |
103 | } | |
104 | ||
105 | return readlink(path, buf, bufsiz); | |
106 | } | |
107 | #endif | |
8e15bd87 | 108 | #endif |
31e12522 | 109 | |
4f5b0756 | 110 | #ifdef HAVE_LINK |
63cf5ae7 | 111 | int do_link(const char *fname1, const char *fname2) |
31e12522 AT |
112 | { |
113 | if (dry_run) return 0; | |
cfeed4da | 114 | RETURN_ERROR_IF_RO_OR_LO; |
31e12522 AT |
115 | return link(fname1, fname2); |
116 | } | |
f92ef572 | 117 | #endif |
31e12522 | 118 | |
7308bd66 AT |
119 | int do_lchown(const char *path, uid_t owner, gid_t group) |
120 | { | |
121 | if (dry_run) return 0; | |
cfeed4da | 122 | RETURN_ERROR_IF_RO_OR_LO; |
4f5b0756 | 123 | #ifndef HAVE_LCHOWN |
05154760 WD |
124 | #define lchown chown |
125 | #endif | |
7308bd66 AT |
126 | return lchown(path, owner, group); |
127 | } | |
128 | ||
4a19c3b2 | 129 | int do_mknod(const char *pathname, mode_t mode, dev_t dev) |
31e12522 AT |
130 | { |
131 | if (dry_run) return 0; | |
cfeed4da | 132 | RETURN_ERROR_IF_RO_OR_LO; |
9439c0cb WD |
133 | |
134 | /* For --fake-super, we create a normal file with mode 0600. */ | |
135 | if (am_root < 0) { | |
136 | int fd = open(pathname, O_WRONLY|O_CREAT|O_TRUNC, S_IWUSR|S_IRUSR); | |
137 | if (fd < 0 || close(fd) < 0) | |
138 | return -1; | |
139 | return 0; | |
140 | } | |
141 | ||
4f5b0756 | 142 | #if !defined MKNOD_CREATES_FIFOS && defined HAVE_MKFIFO |
da6eb9d1 WD |
143 | if (S_ISFIFO(mode)) |
144 | return mkfifo(pathname, mode); | |
145 | #endif | |
4f5b0756 | 146 | #if !defined MKNOD_CREATES_SOCKETS && defined HAVE_SYS_UN_H |
da6eb9d1 WD |
147 | if (S_ISSOCK(mode)) { |
148 | int sock; | |
149 | struct sockaddr_un saddr; | |
4f375592 WD |
150 | #ifdef HAVE_SOCKADDR_UN_LEN |
151 | unsigned int len = | |
152 | #endif | |
153 | strlcpy(saddr.sun_path, pathname, sizeof saddr.sun_path); | |
4f5b0756 | 154 | #ifdef HAVE_SOCKADDR_UN_LEN |
da6eb9d1 WD |
155 | saddr.sun_len = len >= sizeof saddr.sun_path |
156 | ? sizeof saddr.sun_path : len + 1; | |
157 | #endif | |
4f375592 | 158 | saddr.sun_family = AF_UNIX; |
da6eb9d1 WD |
159 | |
160 | if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0 | |
161 | || (unlink(pathname) < 0 && errno != ENOENT) | |
162 | || (bind(sock, (struct sockaddr*)&saddr, sizeof saddr)) < 0) | |
163 | return -1; | |
164 | close(sock); | |
d11f5c6e | 165 | #ifdef HAVE_CHMOD |
4fd842f9 | 166 | return do_chmod(pathname, mode); |
d11f5c6e WD |
167 | #else |
168 | return 0; | |
169 | #endif | |
da6eb9d1 WD |
170 | } |
171 | #endif | |
4f5b0756 | 172 | #ifdef HAVE_MKNOD |
31e12522 | 173 | return mknod(pathname, mode, dev); |
da6eb9d1 WD |
174 | #else |
175 | return -1; | |
f92ef572 | 176 | #endif |
da6eb9d1 | 177 | } |
31e12522 | 178 | |
63cf5ae7 | 179 | int do_rmdir(const char *pathname) |
31e12522 AT |
180 | { |
181 | if (dry_run) return 0; | |
cfeed4da | 182 | RETURN_ERROR_IF_RO_OR_LO; |
31e12522 AT |
183 | return rmdir(pathname); |
184 | } | |
185 | ||
63cf5ae7 | 186 | int do_open(const char *pathname, int flags, mode_t mode) |
31e12522 | 187 | { |
3420c8e6 | 188 | if (flags != O_RDONLY) { |
7a27e9b5 | 189 | RETURN_ERROR_IF(dry_run, 0); |
cfeed4da | 190 | RETURN_ERROR_IF_RO_OR_LO; |
3420c8e6 | 191 | } |
b0f3f578 | 192 | |
e106de49 | 193 | return open(pathname, flags | O_BINARY, mode); |
31e12522 | 194 | } |
7308bd66 | 195 | |
4f5b0756 | 196 | #ifdef HAVE_CHMOD |
7308bd66 AT |
197 | int do_chmod(const char *path, mode_t mode) |
198 | { | |
f0b4fdaf | 199 | int code; |
7308bd66 | 200 | if (dry_run) return 0; |
cfeed4da | 201 | RETURN_ERROR_IF_RO_OR_LO; |
d11f5c6e | 202 | #ifdef HAVE_LCHMOD |
42562649 WD |
203 | code = lchmod(path, mode & CHMOD_BITS); |
204 | #else | |
205 | if (S_ISLNK(mode)) { | |
206 | # if defined HAVE_SETATTRLIST | |
11b02d92 WD |
207 | struct attrlist attrList; |
208 | uint32_t m = mode & CHMOD_BITS; /* manpage is wrong: not mode_t! */ | |
209 | ||
210 | memset(&attrList, 0, sizeof attrList); | |
211 | attrList.bitmapcount = ATTR_BIT_MAP_COUNT; | |
212 | attrList.commonattr = ATTR_CMN_ACCESSMASK; | |
213 | code = setattrlist(path, &attrList, &m, sizeof m, FSOPT_NOFOLLOW); | |
42562649 | 214 | # else |
d11f5c6e | 215 | code = 1; |
42562649 | 216 | # endif |
d11f5c6e | 217 | } else |
aa0e6b99 | 218 | code = chmod(path, mode & CHMOD_BITS); /* DISCOURAGED FUNCTION */ |
42562649 | 219 | #endif /* !HAVE_LCHMOD */ |
e35ad79b | 220 | if (code != 0 && (preserve_perms || preserve_executability)) |
ff0e1580 | 221 | return code; |
f0b4fdaf | 222 | return 0; |
7308bd66 | 223 | } |
f92ef572 | 224 | #endif |
1b2d733a | 225 | |
63cf5ae7 | 226 | int do_rename(const char *fname1, const char *fname2) |
1b2d733a AT |
227 | { |
228 | if (dry_run) return 0; | |
cfeed4da | 229 | RETURN_ERROR_IF_RO_OR_LO; |
1b2d733a AT |
230 | return rename(fname1, fname2); |
231 | } | |
232 | ||
96e051c8 WD |
233 | #ifdef HAVE_FTRUNCATE |
234 | int do_ftruncate(int fd, OFF_T size) | |
235 | { | |
236 | int ret; | |
237 | ||
238 | if (dry_run) return 0; | |
239 | RETURN_ERROR_IF_RO_OR_LO; | |
240 | ||
241 | do { | |
242 | ret = ftruncate(fd, size); | |
243 | } while (ret < 0 && errno == EINTR); | |
244 | ||
245 | return ret; | |
246 | } | |
247 | #endif | |
248 | ||
bf4e725d MP |
249 | void trim_trailing_slashes(char *name) |
250 | { | |
c127e8aa | 251 | int l; |
bf4e725d MP |
252 | /* Some BSD systems cannot make a directory if the name |
253 | * contains a trailing slash. | |
254 | * <http://www.opensource.apple.com/bugs/X/BSD%20Kernel/2734739.html> */ | |
0f78b815 | 255 | |
c127e8aa MP |
256 | /* Don't change empty string; and also we can't improve on |
257 | * "/" */ | |
0f78b815 | 258 | |
c127e8aa MP |
259 | l = strlen(name); |
260 | while (l > 1) { | |
261 | if (name[--l] != '/') | |
262 | break; | |
263 | name[l] = '\0'; | |
bf4e725d MP |
264 | } |
265 | } | |
266 | ||
1b2d733a AT |
267 | int do_mkdir(char *fname, mode_t mode) |
268 | { | |
cfeed4da WD |
269 | if (dry_run) return 0; |
270 | RETURN_ERROR_IF_RO_OR_LO; | |
0f78b815 | 271 | trim_trailing_slashes(fname); |
1b2d733a AT |
272 | return mkdir(fname, mode); |
273 | } | |
274 | ||
f62c17e3 AT |
275 | /* like mkstemp but forces permissions */ |
276 | int do_mkstemp(char *template, mode_t perms) | |
277 | { | |
7a27e9b5 | 278 | RETURN_ERROR_IF(dry_run, 0); |
cfeed4da | 279 | RETURN_ERROR_IF(read_only, EROFS); |
0379c8ec | 280 | perms |= S_IWUSR; |
f62c17e3 | 281 | |
4f5b0756 | 282 | #if defined HAVE_SECURE_MKSTEMP && defined HAVE_FCHMOD && (!defined HAVE_OPEN64 || defined HAVE_MKSTEMP64) |
f62c17e3 AT |
283 | { |
284 | int fd = mkstemp(template); | |
cfeed4da WD |
285 | if (fd == -1) |
286 | return -1; | |
287 | if (fchmod(fd, perms) != 0 && preserve_perms) { | |
288 | int errno_save = errno; | |
f62c17e3 AT |
289 | close(fd); |
290 | unlink(template); | |
cfeed4da | 291 | errno = errno_save; |
f62c17e3 AT |
292 | return -1; |
293 | } | |
4f5b0756 | 294 | #if defined HAVE_SETMODE && O_BINARY |
3267d6a9 WD |
295 | setmode(fd, O_BINARY); |
296 | #endif | |
f62c17e3 AT |
297 | return fd; |
298 | } | |
299 | #else | |
cfeed4da WD |
300 | if (!mktemp(template)) |
301 | return -1; | |
25f2cb3d | 302 | return do_open(template, O_RDWR|O_EXCL|O_CREAT, perms); |
f62c17e3 | 303 | #endif |
1b2d733a | 304 | } |
bcacc18b AT |
305 | |
306 | int do_stat(const char *fname, STRUCT_STAT *st) | |
307 | { | |
4f5b0756 | 308 | #ifdef USE_STAT64_FUNCS |
bcacc18b AT |
309 | return stat64(fname, st); |
310 | #else | |
311 | return stat(fname, st); | |
312 | #endif | |
313 | } | |
314 | ||
315 | int do_lstat(const char *fname, STRUCT_STAT *st) | |
316 | { | |
4f5b0756 WD |
317 | #ifdef SUPPORT_LINKS |
318 | # ifdef USE_STAT64_FUNCS | |
bcacc18b | 319 | return lstat64(fname, st); |
0957a746 | 320 | # else |
bcacc18b | 321 | return lstat(fname, st); |
0957a746 WD |
322 | # endif |
323 | #else | |
324 | return do_stat(fname, st); | |
bcacc18b AT |
325 | #endif |
326 | } | |
327 | ||
328 | int do_fstat(int fd, STRUCT_STAT *st) | |
329 | { | |
4f5b0756 | 330 | #ifdef USE_STAT64_FUNCS |
bcacc18b AT |
331 | return fstat64(fd, st); |
332 | #else | |
333 | return fstat(fd, st); | |
334 | #endif | |
335 | } | |
73233f0f AT |
336 | |
337 | OFF_T do_lseek(int fd, OFF_T offset, int whence) | |
338 | { | |
ebd33e0c | 339 | #ifdef HAVE_LSEEK64 |
f853b777 WD |
340 | #if !SIZEOF_OFF64_T |
341 | OFF_T lseek64(); | |
342 | #else | |
f28ee65b | 343 | off64_t lseek64(); |
f853b777 | 344 | #endif |
73233f0f AT |
345 | return lseek64(fd, offset, whence); |
346 | #else | |
347 | return lseek(fd, offset, whence); | |
348 | #endif | |
349 | } | |
2a189350 WD |
350 | |
351 | #ifdef HAVE_UTIMENSAT | |
352 | int do_utimensat(const char *fname, time_t modtime, uint32 mod_nsec) | |
353 | { | |
354 | struct timespec t[2]; | |
355 | ||
356 | if (dry_run) return 0; | |
357 | RETURN_ERROR_IF_RO_OR_LO; | |
358 | ||
359 | t[0].tv_sec = 0; | |
360 | t[0].tv_nsec = UTIME_NOW; | |
361 | t[1].tv_sec = modtime; | |
362 | t[1].tv_nsec = mod_nsec; | |
363 | return utimensat(AT_FDCWD, fname, t, AT_SYMLINK_NOFOLLOW); | |
364 | } | |
365 | #endif | |
366 | ||
367 | #ifdef HAVE_LUTIMES | |
368 | int do_lutimes(const char *fname, time_t modtime, uint32 mod_nsec) | |
369 | { | |
370 | struct timeval t[2]; | |
371 | ||
372 | if (dry_run) return 0; | |
373 | RETURN_ERROR_IF_RO_OR_LO; | |
374 | ||
375 | t[0].tv_sec = time(NULL); | |
376 | t[0].tv_usec = 0; | |
377 | t[1].tv_sec = modtime; | |
378 | t[1].tv_usec = mod_nsec / 1000; | |
379 | return lutimes(fname, t); | |
380 | } | |
381 | #endif | |
382 | ||
383 | #ifdef HAVE_UTIMES | |
384 | int do_utimes(const char *fname, time_t modtime, uint32 mod_nsec) | |
385 | { | |
386 | struct timeval t[2]; | |
387 | ||
388 | if (dry_run) return 0; | |
389 | RETURN_ERROR_IF_RO_OR_LO; | |
390 | ||
391 | t[0].tv_sec = time(NULL); | |
392 | t[0].tv_usec = 0; | |
393 | t[1].tv_sec = modtime; | |
394 | t[1].tv_usec = mod_nsec / 1000; | |
395 | return utimes(fname, t); | |
396 | } | |
397 | ||
398 | #elif defined HAVE_UTIME | |
399 | int do_utime(const char *fname, time_t modtime, UNUSED(uint32 mod_nsec)) | |
400 | { | |
401 | #ifdef HAVE_STRUCT_UTIMBUF | |
402 | struct utimbuf tbuf; | |
403 | #else | |
404 | time_t t[2]; | |
405 | #endif | |
406 | ||
407 | if (dry_run) return 0; | |
408 | RETURN_ERROR_IF_RO_OR_LO; | |
409 | ||
410 | # ifdef HAVE_STRUCT_UTIMBUF | |
411 | tbuf.actime = time(NULL); | |
412 | tbuf.modtime = modtime; | |
413 | return utime(fname, &tbuf); | |
414 | # else | |
415 | t[0] = time(NULL); | |
416 | t[1] = modtime; | |
417 | return utime(fname, t); | |
418 | # endif | |
419 | } | |
420 | ||
421 | #else | |
422 | #error Need utimes or utime function. | |
423 | #endif | |
28b519c9 WD |
424 | |
425 | #ifdef SUPPORT_PREALLOCATION | |
426 | int do_fallocate(int fd, OFF_T offset, OFF_T length) | |
427 | { | |
428 | #ifdef FALLOC_FL_KEEP_SIZE | |
429 | #define DO_FALLOC_OPTIONS FALLOC_FL_KEEP_SIZE | |
430 | #else | |
431 | #define DO_FALLOC_OPTIONS 0 | |
432 | #endif | |
433 | RETURN_ERROR_IF(dry_run, 0); | |
434 | RETURN_ERROR_IF_RO_OR_LO; | |
435 | #if defined HAVE_FALLOCATE | |
436 | return fallocate(fd, DO_FALLOC_OPTIONS, offset, length); | |
437 | #elif defined HAVE_SYS_FALLOCATE | |
438 | return syscall(SYS_fallocate, fd, DO_FALLOC_OPTIONS, (loff_t)offset, (loff_t)length); | |
439 | #elif defined HAVE_EFFICIENT_POSIX_FALLOCATE | |
440 | return posix_fallocate(fd, offset, length); | |
441 | #else | |
442 | #error Coding error in SUPPORT_PREALLOCATION logic. | |
443 | #endif | |
444 | } | |
445 | #endif |