2 * Syscall wrappers to ensure that nothing gets done in dry_run mode
3 * and to handle system peculiarities.
5 * Copyright (C) 1998 Andrew Tridgell
6 * Copyright (C) 2002 Martin Pool
7 * Copyright (C) 2003-2009 Wayne Davison
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.
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.
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.
25 #if !defined MKNOD_CREATES_SOCKETS && defined HAVE_SYS_UN_H
28 #ifdef HAVE_SYS_ATTR_H
36 extern int preserve_perms;
37 extern int preserve_executability;
39 #define RETURN_ERROR_IF(x,e) \
47 #define RETURN_ERROR_IF_RO_OR_LO RETURN_ERROR_IF(read_only || list_only, EROFS)
49 int do_unlink(const char *fname)
51 if (dry_run) return 0;
52 RETURN_ERROR_IF_RO_OR_LO;
57 int do_symlink(const char *lnk, const char *fname)
59 if (dry_run) return 0;
60 RETURN_ERROR_IF_RO_OR_LO;
61 return symlink(lnk, fname);
66 int do_link(const char *fname1, const char *fname2)
68 if (dry_run) return 0;
69 RETURN_ERROR_IF_RO_OR_LO;
70 return link(fname1, fname2);
74 int do_lchown(const char *path, uid_t owner, gid_t group)
76 if (dry_run) return 0;
77 RETURN_ERROR_IF_RO_OR_LO;
81 return lchown(path, owner, group);
84 int do_mknod(const char *pathname, mode_t mode, dev_t dev)
86 if (dry_run) return 0;
87 RETURN_ERROR_IF_RO_OR_LO;
89 /* For --fake-super, we create a normal file with mode 0600. */
91 int fd = open(pathname, O_WRONLY|O_CREAT|O_TRUNC, S_IWUSR|S_IRUSR);
92 if (fd < 0 || close(fd) < 0)
97 #if !defined MKNOD_CREATES_FIFOS && defined HAVE_MKFIFO
99 return mkfifo(pathname, mode);
101 #if !defined MKNOD_CREATES_SOCKETS && defined HAVE_SYS_UN_H
102 if (S_ISSOCK(mode)) {
104 struct sockaddr_un saddr;
105 #ifdef HAVE_SOCKADDR_UN_LEN
108 strlcpy(saddr.sun_path, pathname, sizeof saddr.sun_path);
109 #ifdef HAVE_SOCKADDR_UN_LEN
110 saddr.sun_len = len >= sizeof saddr.sun_path
111 ? sizeof saddr.sun_path : len + 1;
113 saddr.sun_family = AF_UNIX;
115 if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0
116 || (unlink(pathname) < 0 && errno != ENOENT)
117 || (bind(sock, (struct sockaddr*)&saddr, sizeof saddr)) < 0)
121 return do_chmod(pathname, mode);
128 return mknod(pathname, mode, dev);
134 int do_rmdir(const char *pathname)
136 if (dry_run) return 0;
137 RETURN_ERROR_IF_RO_OR_LO;
138 return rmdir(pathname);
141 int do_open(const char *pathname, int flags, mode_t mode)
143 if (flags != O_RDONLY) {
144 RETURN_ERROR_IF(dry_run, 0);
145 RETURN_ERROR_IF_RO_OR_LO;
148 return open(pathname, flags | O_BINARY, mode);
152 int do_chmod(const char *path, mode_t mode)
155 if (dry_run) return 0;
156 RETURN_ERROR_IF_RO_OR_LO;
159 code = lchmod(path, mode & CHMOD_BITS);
160 #elif defined HAVE_SETATTRLIST
161 struct attrlist attrList;
162 uint32_t m = mode & CHMOD_BITS; /* manpage is wrong: not mode_t! */
164 memset(&attrList, 0, sizeof attrList);
165 attrList.bitmapcount = ATTR_BIT_MAP_COUNT;
166 attrList.commonattr = ATTR_CMN_ACCESSMASK;
167 code = setattrlist(path, &attrList, &m, sizeof m, FSOPT_NOFOLLOW);
172 code = chmod(path, mode & CHMOD_BITS); /* DISCOURAGED FUNCTION */
173 if (code != 0 && (preserve_perms || preserve_executability))
179 int do_rename(const char *fname1, const char *fname2)
181 if (dry_run) return 0;
182 RETURN_ERROR_IF_RO_OR_LO;
183 return rename(fname1, fname2);
186 void trim_trailing_slashes(char *name)
189 /* Some BSD systems cannot make a directory if the name
190 * contains a trailing slash.
191 * <http://www.opensource.apple.com/bugs/X/BSD%20Kernel/2734739.html> */
193 /* Don't change empty string; and also we can't improve on
198 if (name[--l] != '/')
204 int do_mkdir(char *fname, mode_t mode)
206 if (dry_run) return 0;
207 RETURN_ERROR_IF_RO_OR_LO;
208 trim_trailing_slashes(fname);
209 return mkdir(fname, mode);
212 /* like mkstemp but forces permissions */
213 int do_mkstemp(char *template, mode_t perms)
215 RETURN_ERROR_IF(dry_run, 0);
216 RETURN_ERROR_IF(read_only, EROFS);
219 #if defined HAVE_SECURE_MKSTEMP && defined HAVE_FCHMOD && (!defined HAVE_OPEN64 || defined HAVE_MKSTEMP64)
221 int fd = mkstemp(template);
224 if (fchmod(fd, perms) != 0 && preserve_perms) {
225 int errno_save = errno;
231 #if defined HAVE_SETMODE && O_BINARY
232 setmode(fd, O_BINARY);
237 if (!mktemp(template))
239 return do_open(template, O_RDWR|O_EXCL|O_CREAT, perms);
243 int do_stat(const char *fname, STRUCT_STAT *st)
245 #ifdef USE_STAT64_FUNCS
246 return stat64(fname, st);
248 return stat(fname, st);
252 int do_lstat(const char *fname, STRUCT_STAT *st)
255 # ifdef USE_STAT64_FUNCS
256 return lstat64(fname, st);
258 return lstat(fname, st);
261 return do_stat(fname, st);
265 int do_fstat(int fd, STRUCT_STAT *st)
267 #ifdef USE_STAT64_FUNCS
268 return fstat64(fd, st);
270 return fstat(fd, st);
274 OFF_T do_lseek(int fd, OFF_T offset, int whence)
282 return lseek64(fd, offset, whence);
284 return lseek(fd, offset, whence);