1: /*
2: * Syscall wrappers to ensure that nothing gets done in dry_run mode
3: * and to handle system peculiarities.
4: *
5: * Copyright (C) 1998 Andrew Tridgell
6: * Copyright (C) 2002 Martin Pool
7: * Copyright (C) 2003-2013 Wayne Davison
8: *
9: * This program is free software; you can redistribute it and/or modify
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.
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: *
19: * You should have received a copy of the GNU General Public License along
20: * with this program; if not, visit the http://fsf.org website.
21: */
22:
23: #include "rsync.h"
24:
25: #if !defined MKNOD_CREATES_SOCKETS && defined HAVE_SYS_UN_H
26: #include <sys/un.h>
27: #endif
28: #ifdef HAVE_SYS_ATTR_H
29: #include <sys/attr.h>
30: #endif
31:
32: #if defined HAVE_SYS_FALLOCATE && !defined HAVE_FALLOCATE
33: #include <sys/syscall.h>
34: #endif
35:
36: extern int dry_run;
37: extern int am_root;
38: extern int am_sender;
39: extern int read_only;
40: extern int list_only;
41: extern int preserve_perms;
42: extern int preserve_executability;
43:
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)
53:
54: int do_unlink(const char *fname)
55: {
56: if (dry_run) return 0;
57: RETURN_ERROR_IF_RO_OR_LO;
58: return unlink(fname);
59: }
60:
61: #ifdef SUPPORT_LINKS
62: int do_symlink(const char *lnk, const char *fname)
63: {
64: if (dry_run) return 0;
65: RETURN_ERROR_IF_RO_OR_LO;
66:
67: #if defined NO_SYMLINK_XATTRS || defined NO_SYMLINK_USER_XATTRS
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:
82: return symlink(lnk, fname);
83: }
84:
85: #if defined NO_SYMLINK_XATTRS || defined NO_SYMLINK_USER_XATTRS
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 = do_open_nofollow(path, O_RDONLY);
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
108: #endif
109:
110: #ifdef HAVE_LINK
111: int do_link(const char *fname1, const char *fname2)
112: {
113: if (dry_run) return 0;
114: RETURN_ERROR_IF_RO_OR_LO;
115: return link(fname1, fname2);
116: }
117: #endif
118:
119: int do_lchown(const char *path, uid_t owner, gid_t group)
120: {
121: if (dry_run) return 0;
122: RETURN_ERROR_IF_RO_OR_LO;
123: #ifndef HAVE_LCHOWN
124: #define lchown chown
125: #endif
126: return lchown(path, owner, group);
127: }
128:
129: int do_mknod(const char *pathname, mode_t mode, dev_t dev)
130: {
131: if (dry_run) return 0;
132: RETURN_ERROR_IF_RO_OR_LO;
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:
142: #if !defined MKNOD_CREATES_FIFOS && defined HAVE_MKFIFO
143: if (S_ISFIFO(mode))
144: return mkfifo(pathname, mode);
145: #endif
146: #if !defined MKNOD_CREATES_SOCKETS && defined HAVE_SYS_UN_H
147: if (S_ISSOCK(mode)) {
148: int sock;
149: struct sockaddr_un saddr;
150: #ifdef HAVE_SOCKADDR_UN_LEN
151: unsigned int len =
152: #endif
153: strlcpy(saddr.sun_path, pathname, sizeof saddr.sun_path);
154: #ifdef HAVE_SOCKADDR_UN_LEN
155: saddr.sun_len = len >= sizeof saddr.sun_path
156: ? sizeof saddr.sun_path : len + 1;
157: #endif
158: saddr.sun_family = AF_UNIX;
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);
165: #ifdef HAVE_CHMOD
166: return do_chmod(pathname, mode);
167: #else
168: return 0;
169: #endif
170: }
171: #endif
172: #ifdef HAVE_MKNOD
173: return mknod(pathname, mode, dev);
174: #else
175: return -1;
176: #endif
177: }
178:
179: int do_rmdir(const char *pathname)
180: {
181: if (dry_run) return 0;
182: RETURN_ERROR_IF_RO_OR_LO;
183: return rmdir(pathname);
184: }
185:
186: int do_open(const char *pathname, int flags, mode_t mode)
187: {
188: if (flags != O_RDONLY) {
189: RETURN_ERROR_IF(dry_run, 0);
190: RETURN_ERROR_IF_RO_OR_LO;
191: }
192:
193: return open(pathname, flags | O_BINARY, mode);
194: }
195:
196: #ifdef HAVE_CHMOD
197: int do_chmod(const char *path, mode_t mode)
198: {
199: int code;
200: if (dry_run) return 0;
201: RETURN_ERROR_IF_RO_OR_LO;
202: #ifdef HAVE_LCHMOD
203: code = lchmod(path, mode & CHMOD_BITS);
204: #else
205: if (S_ISLNK(mode)) {
206: # if defined HAVE_SETATTRLIST
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);
214: # else
215: code = 1;
216: # endif
217: } else
218: code = chmod(path, mode & CHMOD_BITS); /* DISCOURAGED FUNCTION */
219: #endif /* !HAVE_LCHMOD */
220: if (code != 0 && (preserve_perms || preserve_executability))
221: return code;
222: return 0;
223: }
224: #endif
225:
226: int do_rename(const char *fname1, const char *fname2)
227: {
228: if (dry_run) return 0;
229: RETURN_ERROR_IF_RO_OR_LO;
230: return rename(fname1, fname2);
231: }
232:
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:
249: void trim_trailing_slashes(char *name)
250: {
251: int l;
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> */
255:
256: /* Don't change empty string; and also we can't improve on
257: * "/" */
258:
259: l = strlen(name);
260: while (l > 1) {
261: if (name[--l] != '/')
262: break;
263: name[l] = '\0';
264: }
265: }
266:
267: int do_mkdir(char *fname, mode_t mode)
268: {
269: if (dry_run) return 0;
270: RETURN_ERROR_IF_RO_OR_LO;
271: trim_trailing_slashes(fname);
272: return mkdir(fname, mode);
273: }
274:
275: /* like mkstemp but forces permissions */
276: int do_mkstemp(char *template, mode_t perms)
277: {
278: RETURN_ERROR_IF(dry_run, 0);
279: RETURN_ERROR_IF(read_only, EROFS);
280: perms |= S_IWUSR;
281:
282: #if defined HAVE_SECURE_MKSTEMP && defined HAVE_FCHMOD && (!defined HAVE_OPEN64 || defined HAVE_MKSTEMP64)
283: {
284: int fd = mkstemp(template);
285: if (fd == -1)
286: return -1;
287: if (fchmod(fd, perms) != 0 && preserve_perms) {
288: int errno_save = errno;
289: close(fd);
290: unlink(template);
291: errno = errno_save;
292: return -1;
293: }
294: #if defined HAVE_SETMODE && O_BINARY
295: setmode(fd, O_BINARY);
296: #endif
297: return fd;
298: }
299: #else
300: if (!mktemp(template))
301: return -1;
302: return do_open(template, O_RDWR|O_EXCL|O_CREAT, perms);
303: #endif
304: }
305:
306: int do_stat(const char *fname, STRUCT_STAT *st)
307: {
308: #ifdef USE_STAT64_FUNCS
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: {
317: #ifdef SUPPORT_LINKS
318: # ifdef USE_STAT64_FUNCS
319: return lstat64(fname, st);
320: # else
321: return lstat(fname, st);
322: # endif
323: #else
324: return do_stat(fname, st);
325: #endif
326: }
327:
328: int do_fstat(int fd, STRUCT_STAT *st)
329: {
330: #ifdef USE_STAT64_FUNCS
331: return fstat64(fd, st);
332: #else
333: return fstat(fd, st);
334: #endif
335: }
336:
337: OFF_T do_lseek(int fd, OFF_T offset, int whence)
338: {
339: #ifdef HAVE_LSEEK64
340: #if !SIZEOF_OFF64_T
341: OFF_T lseek64();
342: #else
343: off64_t lseek64();
344: #endif
345: return lseek64(fd, offset, whence);
346: #else
347: return lseek(fd, offset, whence);
348: #endif
349: }
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
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
446:
447: int do_open_nofollow(const char *pathname, int flags)
448: {
449: #ifndef O_NOFOLLOW
450: STRUCT_STAT f_st, l_st;
451: #endif
452: int fd;
453:
454: if (flags != O_RDONLY) {
455: RETURN_ERROR_IF(dry_run, 0);
456: RETURN_ERROR_IF_RO_OR_LO;
457: #ifndef O_NOFOLLOW
458: /* This function doesn't support write attempts w/o O_NOFOLLOW. */
459: errno = EINVAL;
460: return -1;
461: #endif
462: }
463:
464: #ifdef O_NOFOLLOW
465: fd = open(pathname, flags|O_NOFOLLOW);
466: #else
467: if (do_lstat(pathname, &l_st) < 0)
468: return -1;
469: if (S_ISLNK(l_st.st_mode)) {
470: errno = ELOOP;
471: return -1;
472: }
473: if ((fd = open(pathname, flags)) < 0)
474: return fd;
475: if (do_fstat(fd, &f_st) < 0) {
476: close_and_return_error:
477: {
478: int save_errno = errno;
479: close(fd);
480: errno = save_errno;
481: }
482: return -1;
483: }
484: if (l_st.st_dev != f_st.st_dev || l_st.st_ino != f_st.st_ino) {
485: errno = EINVAL;
486: goto close_and_return_error;
487: }
488: #endif
489:
490: return fd;
491: }
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