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) 2003-2009 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: extern int dry_run;
33: extern int am_root;
34: extern int read_only;
35: extern int list_only;
36: extern int preserve_perms;
37: extern int preserve_executability;
38:
39: #define RETURN_ERROR_IF(x,e) \
40: do { \
41: if (x) { \
42: errno = (e); \
43: return -1; \
44: } \
45: } while (0)
46:
47: #define RETURN_ERROR_IF_RO_OR_LO RETURN_ERROR_IF(read_only || list_only, EROFS)
48:
49: int do_unlink(const char *fname)
50: {
51: if (dry_run) return 0;
52: RETURN_ERROR_IF_RO_OR_LO;
53: return unlink(fname);
54: }
55:
56: int do_symlink(const char *fname1, const char *fname2)
57: {
58: if (dry_run) return 0;
59: RETURN_ERROR_IF_RO_OR_LO;
60: return symlink(fname1, fname2);
61: }
62:
63: #ifdef HAVE_LINK
64: int do_link(const char *fname1, const char *fname2)
65: {
66: if (dry_run) return 0;
67: RETURN_ERROR_IF_RO_OR_LO;
68: return link(fname1, fname2);
69: }
70: #endif
71:
72: int do_lchown(const char *path, uid_t owner, gid_t group)
73: {
74: if (dry_run) return 0;
75: RETURN_ERROR_IF_RO_OR_LO;
76: #ifndef HAVE_LCHOWN
77: #define lchown chown
78: #endif
79: return lchown(path, owner, group);
80: }
81:
82: int do_mknod(const char *pathname, mode_t mode, dev_t dev)
83: {
84: if (dry_run) return 0;
85: RETURN_ERROR_IF_RO_OR_LO;
86:
87: /* For --fake-super, we create a normal file with mode 0600. */
88: if (am_root < 0) {
89: int fd = open(pathname, O_WRONLY|O_CREAT|O_TRUNC, S_IWUSR|S_IRUSR);
90: if (fd < 0 || close(fd) < 0)
91: return -1;
92: return 0;
93: }
94:
95: #if !defined MKNOD_CREATES_FIFOS && defined HAVE_MKFIFO
96: if (S_ISFIFO(mode))
97: return mkfifo(pathname, mode);
98: #endif
99: #if !defined MKNOD_CREATES_SOCKETS && defined HAVE_SYS_UN_H
100: if (S_ISSOCK(mode)) {
101: int sock;
102: struct sockaddr_un saddr;
103: #ifdef HAVE_SOCKADDR_UN_LEN
104: unsigned int len =
105: #endif
106: strlcpy(saddr.sun_path, pathname, sizeof saddr.sun_path);
107: #ifdef HAVE_SOCKADDR_UN_LEN
108: saddr.sun_len = len >= sizeof saddr.sun_path
109: ? sizeof saddr.sun_path : len + 1;
110: #endif
111: saddr.sun_family = AF_UNIX;
112:
113: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0
114: || (unlink(pathname) < 0 && errno != ENOENT)
115: || (bind(sock, (struct sockaddr*)&saddr, sizeof saddr)) < 0)
116: return -1;
117: close(sock);
118: #ifdef HAVE_CHMOD
119: return do_chmod(pathname, mode);
120: #else
121: return 0;
122: #endif
123: }
124: #endif
125: #ifdef HAVE_MKNOD
126: return mknod(pathname, mode, dev);
127: #else
128: return -1;
129: #endif
130: }
131:
132: int do_rmdir(const char *pathname)
133: {
134: if (dry_run) return 0;
135: RETURN_ERROR_IF_RO_OR_LO;
136: return rmdir(pathname);
137: }
138:
139: int do_open(const char *pathname, int flags, mode_t mode)
140: {
141: if (flags != O_RDONLY) {
142: RETURN_ERROR_IF(dry_run, 0);
143: RETURN_ERROR_IF_RO_OR_LO;
144: }
145:
146: return open(pathname, flags | O_BINARY, mode);
147: }
148:
149: #ifdef HAVE_CHMOD
150: int do_chmod(const char *path, mode_t mode)
151: {
152: int code;
153: if (dry_run) return 0;
154: RETURN_ERROR_IF_RO_OR_LO;
155: #ifdef HAVE_LCHMOD
156: code = lchmod(path, mode & CHMOD_BITS);
157: #else
158: if (S_ISLNK(mode)) {
159: # if defined HAVE_SETATTRLIST
160: struct attrlist attrList;
161: uint32_t m = mode & CHMOD_BITS; /* manpage is wrong: not mode_t! */
162:
163: memset(&attrList, 0, sizeof attrList);
164: attrList.bitmapcount = ATTR_BIT_MAP_COUNT;
165: attrList.commonattr = ATTR_CMN_ACCESSMASK;
166: code = setattrlist(path, &attrList, &m, sizeof m, FSOPT_NOFOLLOW);
167: # else
168: code = 1;
169: # endif
170: } else
171: code = chmod(path, mode & CHMOD_BITS); /* DISCOURAGED FUNCTION */
172: #endif /* !HAVE_LCHMOD */
173: if (code != 0 && (preserve_perms || preserve_executability))
174: return code;
175: return 0;
176: }
177: #endif
178:
179: int do_rename(const char *fname1, const char *fname2)
180: {
181: if (dry_run) return 0;
182: RETURN_ERROR_IF_RO_OR_LO;
183: return rename(fname1, fname2);
184: }
185:
186: #ifdef HAVE_FTRUNCATE
187: int do_ftruncate(int fd, OFF_T size)
188: {
189: int ret;
190:
191: if (dry_run) return 0;
192: RETURN_ERROR_IF_RO_OR_LO;
193:
194: do {
195: ret = ftruncate(fd, size);
196: } while (ret < 0 && errno == EINTR);
197:
198: return ret;
199: }
200: #endif
201:
202: void trim_trailing_slashes(char *name)
203: {
204: int l;
205: /* Some BSD systems cannot make a directory if the name
206: * contains a trailing slash.
207: * <http://www.opensource.apple.com/bugs/X/BSD%20Kernel/2734739.html> */
208:
209: /* Don't change empty string; and also we can't improve on
210: * "/" */
211:
212: l = strlen(name);
213: while (l > 1) {
214: if (name[--l] != '/')
215: break;
216: name[l] = '\0';
217: }
218: }
219:
220: int do_mkdir(char *fname, mode_t mode)
221: {
222: if (dry_run) return 0;
223: RETURN_ERROR_IF_RO_OR_LO;
224: trim_trailing_slashes(fname);
225: return mkdir(fname, mode);
226: }
227:
228: /* like mkstemp but forces permissions */
229: int do_mkstemp(char *template, mode_t perms)
230: {
231: RETURN_ERROR_IF(dry_run, 0);
232: RETURN_ERROR_IF(read_only, EROFS);
233: perms |= S_IWUSR;
234:
235: #if defined HAVE_SECURE_MKSTEMP && defined HAVE_FCHMOD && (!defined HAVE_OPEN64 || defined HAVE_MKSTEMP64)
236: {
237: int fd = mkstemp(template);
238: if (fd == -1)
239: return -1;
240: if (fchmod(fd, perms) != 0 && preserve_perms) {
241: int errno_save = errno;
242: close(fd);
243: unlink(template);
244: errno = errno_save;
245: return -1;
246: }
247: #if defined HAVE_SETMODE && O_BINARY
248: setmode(fd, O_BINARY);
249: #endif
250: return fd;
251: }
252: #else
253: if (!mktemp(template))
254: return -1;
255: return do_open(template, O_RDWR|O_EXCL|O_CREAT, perms);
256: #endif
257: }
258:
259: int do_stat(const char *fname, STRUCT_STAT *st)
260: {
261: #ifdef USE_STAT64_FUNCS
262: return stat64(fname, st);
263: #else
264: return stat(fname, st);
265: #endif
266: }
267:
268: int do_lstat(const char *fname, STRUCT_STAT *st)
269: {
270: #ifdef SUPPORT_LINKS
271: # ifdef USE_STAT64_FUNCS
272: return lstat64(fname, st);
273: # else
274: return lstat(fname, st);
275: # endif
276: #else
277: return do_stat(fname, st);
278: #endif
279: }
280:
281: int do_fstat(int fd, STRUCT_STAT *st)
282: {
283: #ifdef USE_STAT64_FUNCS
284: return fstat64(fd, st);
285: #else
286: return fstat(fd, st);
287: #endif
288: }
289:
290: OFF_T do_lseek(int fd, OFF_T offset, int whence)
291: {
292: #ifdef HAVE_LSEEK64
293: #if !SIZEOF_OFF64_T
294: OFF_T lseek64();
295: #else
296: off64_t lseek64();
297: #endif
298: return lseek64(fd, offset, whence);
299: #else
300: return lseek(fd, offset, whence);
301: #endif
302: }
303:
304: #ifdef HAVE_UTIMENSAT
305: int do_utimensat(const char *fname, time_t modtime, uint32 mod_nsec)
306: {
307: struct timespec t[2];
308:
309: if (dry_run) return 0;
310: RETURN_ERROR_IF_RO_OR_LO;
311:
312: t[0].tv_sec = 0;
313: t[0].tv_nsec = UTIME_NOW;
314: t[1].tv_sec = modtime;
315: t[1].tv_nsec = mod_nsec;
316: return utimensat(AT_FDCWD, fname, t, AT_SYMLINK_NOFOLLOW);
317: }
318: #endif
319:
320: #ifdef HAVE_LUTIMES
321: int do_lutimes(const char *fname, time_t modtime, uint32 mod_nsec)
322: {
323: struct timeval t[2];
324:
325: if (dry_run) return 0;
326: RETURN_ERROR_IF_RO_OR_LO;
327:
328: t[0].tv_sec = time(NULL);
329: t[0].tv_usec = 0;
330: t[1].tv_sec = modtime;
331: t[1].tv_usec = mod_nsec / 1000;
332: return lutimes(fname, t);
333: }
334: #endif
335:
336: #ifdef HAVE_UTIMES
337: int do_utimes(const char *fname, time_t modtime, uint32 mod_nsec)
338: {
339: struct timeval t[2];
340:
341: if (dry_run) return 0;
342: RETURN_ERROR_IF_RO_OR_LO;
343:
344: t[0].tv_sec = time(NULL);
345: t[0].tv_usec = 0;
346: t[1].tv_sec = modtime;
347: t[1].tv_usec = mod_nsec / 1000;
348: return utimes(fname, t);
349: }
350:
351: #elif defined HAVE_UTIME
352: int do_utime(const char *fname, time_t modtime, UNUSED(uint32 mod_nsec))
353: {
354: #ifdef HAVE_STRUCT_UTIMBUF
355: struct utimbuf tbuf;
356: #else
357: time_t t[2];
358: #endif
359:
360: if (dry_run) return 0;
361: RETURN_ERROR_IF_RO_OR_LO;
362:
363: # ifdef HAVE_STRUCT_UTIMBUF
364: tbuf.actime = time(NULL);
365: tbuf.modtime = modtime;
366: return utime(fname, &tbuf);
367: # else
368: t[0] = time(NULL);
369: t[1] = modtime;
370: return utime(fname, t);
371: # endif
372: }
373:
374: #else
375: #error Need utimes or utime function.
376: #endif
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