-/*
- Copyright (C) Andrew Tridgell 1998
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-*/
-
/*
- syscall wrappers to ensure that nothing gets done in dry_run mode
- */
+ * Syscall wrappers to ensure that nothing gets done in dry_run mode
+ * and to handle system peculiarities.
+ *
+ * Copyright (C) 1998 Andrew Tridgell
+ * Copyright (C) 2002 Martin Pool
+ * Copyright (C) 2003-2009 Wayne Davison
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, visit the http://fsf.org website.
+ */
#include "rsync.h"
+#if !defined MKNOD_CREATES_SOCKETS && defined HAVE_SYS_UN_H
+#include <sys/un.h>
+#endif
+#ifdef HAVE_SYS_ATTR_H
+#include <sys/attr.h>
+#endif
+
+#if defined HAVE_SYS_FALLOCATE && !defined HAVE_FALLOCATE
+#include <sys/syscall.h>
+#endif
+
extern int dry_run;
+extern int am_root;
+extern int am_sender;
+extern int read_only;
+extern int list_only;
+extern int preserve_perms;
+extern int preserve_executability;
+
+#define RETURN_ERROR_IF(x,e) \
+ do { \
+ if (x) { \
+ errno = (e); \
+ return -1; \
+ } \
+ } while (0)
-int do_unlink(char *fname)
+#define RETURN_ERROR_IF_RO_OR_LO RETURN_ERROR_IF(read_only || list_only, EROFS)
+
+int do_unlink(const char *fname)
{
if (dry_run) return 0;
+ RETURN_ERROR_IF_RO_OR_LO;
return unlink(fname);
}
-int do_symlink(char *fname1, char *fname2)
+#ifdef SUPPORT_LINKS
+int do_symlink(const char *lnk, const char *fname)
{
if (dry_run) return 0;
- return symlink(fname1, fname2);
+ RETURN_ERROR_IF_RO_OR_LO;
+
+#if defined NO_SYMLINK_XATTRS || defined NO_SYMLINK_USER_XATTRS
+ /* For --fake-super, we create a normal file with mode 0600
+ * and write the lnk into it. */
+ if (am_root < 0) {
+ int ok, len = strlen(lnk);
+ int fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, S_IWUSR|S_IRUSR);
+ if (fd < 0)
+ return -1;
+ ok = write(fd, lnk, len) == len;
+ if (close(fd) < 0)
+ ok = 0;
+ return ok ? 0 : -1;
+ }
+#endif
+
+ return symlink(lnk, fname);
}
-#if HAVE_LINK
-int do_link(char *fname1, char *fname2)
+#if defined NO_SYMLINK_XATTRS || defined NO_SYMLINK_USER_XATTRS
+ssize_t do_readlink(const char *path, char *buf, size_t bufsiz)
+{
+ /* For --fake-super, we read the link from the file. */
+ if (am_root < 0) {
+ int fd = do_open_nofollow(path, O_RDONLY);
+ if (fd >= 0) {
+ int len = read(fd, buf, bufsiz);
+ close(fd);
+ return len;
+ }
+ if (errno != ELOOP)
+ return -1;
+ /* A real symlink needs to be turned into a fake one on the receiving
+ * side, so tell the generator that the link has no length. */
+ if (!am_sender)
+ return 0;
+ /* Otherwise fall through and let the sender report the real length. */
+ }
+
+ return readlink(path, buf, bufsiz);
+}
+#endif
+#endif
+
+#ifdef HAVE_LINK
+int do_link(const char *fname1, const char *fname2)
{
if (dry_run) return 0;
+ RETURN_ERROR_IF_RO_OR_LO;
return link(fname1, fname2);
}
#endif
int do_lchown(const char *path, uid_t owner, gid_t group)
{
if (dry_run) return 0;
+ RETURN_ERROR_IF_RO_OR_LO;
+#ifndef HAVE_LCHOWN
+#define lchown chown
+#endif
return lchown(path, owner, group);
}
-#if HAVE_MKNOD
-int do_mknod(char *pathname, mode_t mode, dev_t dev)
+int do_mknod(const char *pathname, mode_t mode, dev_t dev)
{
if (dry_run) return 0;
+ RETURN_ERROR_IF_RO_OR_LO;
+
+ /* For --fake-super, we create a normal file with mode 0600. */
+ if (am_root < 0) {
+ int fd = open(pathname, O_WRONLY|O_CREAT|O_TRUNC, S_IWUSR|S_IRUSR);
+ if (fd < 0 || close(fd) < 0)
+ return -1;
+ return 0;
+ }
+
+#if !defined MKNOD_CREATES_FIFOS && defined HAVE_MKFIFO
+ if (S_ISFIFO(mode))
+ return mkfifo(pathname, mode);
+#endif
+#if !defined MKNOD_CREATES_SOCKETS && defined HAVE_SYS_UN_H
+ if (S_ISSOCK(mode)) {
+ int sock;
+ struct sockaddr_un saddr;
+#ifdef HAVE_SOCKADDR_UN_LEN
+ unsigned int len =
+#endif
+ strlcpy(saddr.sun_path, pathname, sizeof saddr.sun_path);
+#ifdef HAVE_SOCKADDR_UN_LEN
+ saddr.sun_len = len >= sizeof saddr.sun_path
+ ? sizeof saddr.sun_path : len + 1;
+#endif
+ saddr.sun_family = AF_UNIX;
+
+ if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0
+ || (unlink(pathname) < 0 && errno != ENOENT)
+ || (bind(sock, (struct sockaddr*)&saddr, sizeof saddr)) < 0)
+ return -1;
+ close(sock);
+#ifdef HAVE_CHMOD
+ return do_chmod(pathname, mode);
+#else
+ return 0;
+#endif
+ }
+#endif
+#ifdef HAVE_MKNOD
return mknod(pathname, mode, dev);
-}
+#else
+ return -1;
#endif
+}
-int do_rmdir(char *pathname)
+int do_rmdir(const char *pathname)
{
if (dry_run) return 0;
+ RETURN_ERROR_IF_RO_OR_LO;
return rmdir(pathname);
}
-int do_open(char *pathname, int flags, mode_t mode)
+int do_open(const char *pathname, int flags, mode_t mode)
{
- if (dry_run) return -1;
- return open(pathname, flags, mode);
+ if (flags != O_RDONLY) {
+ RETURN_ERROR_IF(dry_run, 0);
+ RETURN_ERROR_IF_RO_OR_LO;
+ }
+
+ return open(pathname, flags | O_BINARY, mode);
}
-#if HAVE_CHMOD
+#ifdef HAVE_CHMOD
int do_chmod(const char *path, mode_t mode)
{
+ int code;
if (dry_run) return 0;
- return chmod(path, mode);
+ RETURN_ERROR_IF_RO_OR_LO;
+#ifdef HAVE_LCHMOD
+ code = lchmod(path, mode & CHMOD_BITS);
+#else
+ if (S_ISLNK(mode)) {
+# if defined HAVE_SETATTRLIST
+ struct attrlist attrList;
+ uint32_t m = mode & CHMOD_BITS; /* manpage is wrong: not mode_t! */
+
+ memset(&attrList, 0, sizeof attrList);
+ attrList.bitmapcount = ATTR_BIT_MAP_COUNT;
+ attrList.commonattr = ATTR_CMN_ACCESSMASK;
+ code = setattrlist(path, &attrList, &m, sizeof m, FSOPT_NOFOLLOW);
+# else
+ code = 1;
+# endif
+ } else
+ code = chmod(path, mode & CHMOD_BITS); /* DISCOURAGED FUNCTION */
+#endif /* !HAVE_LCHMOD */
+ if (code != 0 && (preserve_perms || preserve_executability))
+ return code;
+ return 0;
}
#endif
-int do_rename(char *fname1, char *fname2)
+int do_rename(const char *fname1, const char *fname2)
{
if (dry_run) return 0;
+ RETURN_ERROR_IF_RO_OR_LO;
return rename(fname1, fname2);
}
+#ifdef HAVE_FTRUNCATE
+int do_ftruncate(int fd, OFF_T size)
+{
+ int ret;
+
+ if (dry_run) return 0;
+ RETURN_ERROR_IF_RO_OR_LO;
+
+ do {
+ ret = ftruncate(fd, size);
+ } while (ret < 0 && errno == EINTR);
+
+ return ret;
+}
+#endif
+
+void trim_trailing_slashes(char *name)
+{
+ int l;
+ /* Some BSD systems cannot make a directory if the name
+ * contains a trailing slash.
+ * <http://www.opensource.apple.com/bugs/X/BSD%20Kernel/2734739.html> */
+
+ /* Don't change empty string; and also we can't improve on
+ * "/" */
+
+ l = strlen(name);
+ while (l > 1) {
+ if (name[--l] != '/')
+ break;
+ name[l] = '\0';
+ }
+}
+
int do_mkdir(char *fname, mode_t mode)
{
if (dry_run) return 0;
+ RETURN_ERROR_IF_RO_OR_LO;
+ trim_trailing_slashes(fname);
return mkdir(fname, mode);
}
-char *do_mktemp(char *template)
+/* like mkstemp but forces permissions */
+int do_mkstemp(char *template, mode_t perms)
{
- if (dry_run) return NULL;
- return mktemp(template);
+ RETURN_ERROR_IF(dry_run, 0);
+ RETURN_ERROR_IF(read_only, EROFS);
+ perms |= S_IWUSR;
+
+#if defined HAVE_SECURE_MKSTEMP && defined HAVE_FCHMOD && (!defined HAVE_OPEN64 || defined HAVE_MKSTEMP64)
+ {
+ int fd = mkstemp(template);
+ if (fd == -1)
+ return -1;
+ if (fchmod(fd, perms) != 0 && preserve_perms) {
+ int errno_save = errno;
+ close(fd);
+ unlink(template);
+ errno = errno_save;
+ return -1;
+ }
+#if defined HAVE_SETMODE && O_BINARY
+ setmode(fd, O_BINARY);
+#endif
+ return fd;
+ }
+#else
+ if (!mktemp(template))
+ return -1;
+ return do_open(template, O_RDWR|O_EXCL|O_CREAT, perms);
+#endif
}
int do_stat(const char *fname, STRUCT_STAT *st)
{
-#if HAVE_OFF64_T
+#ifdef USE_STAT64_FUNCS
return stat64(fname, st);
#else
return stat(fname, st);
#endif
}
-#if SUPPORT_LINKS
int do_lstat(const char *fname, STRUCT_STAT *st)
{
-#if HAVE_OFF64_T
+#ifdef SUPPORT_LINKS
+# ifdef USE_STAT64_FUNCS
return lstat64(fname, st);
-#else
+# else
return lstat(fname, st);
+# endif
+#else
+ return do_stat(fname, st);
#endif
}
-#endif
int do_fstat(int fd, STRUCT_STAT *st)
{
-#if HAVE_OFF64_T
+#ifdef USE_STAT64_FUNCS
return fstat64(fd, st);
#else
return fstat(fd, st);
OFF_T do_lseek(int fd, OFF_T offset, int whence)
{
-#if HAVE_OFF64_T
+#ifdef HAVE_LSEEK64
+#if !SIZEOF_OFF64_T
+ OFF_T lseek64();
+#else
off64_t lseek64();
+#endif
return lseek64(fd, offset, whence);
#else
return lseek(fd, offset, whence);
#endif
}
-char *d_name(struct dirent *di)
+#ifdef HAVE_UTIMENSAT
+int do_utimensat(const char *fname, time_t modtime, uint32 mod_nsec)
+{
+ struct timespec t[2];
+
+ if (dry_run) return 0;
+ RETURN_ERROR_IF_RO_OR_LO;
+
+ t[0].tv_sec = 0;
+ t[0].tv_nsec = UTIME_NOW;
+ t[1].tv_sec = modtime;
+ t[1].tv_nsec = mod_nsec;
+ return utimensat(AT_FDCWD, fname, t, AT_SYMLINK_NOFOLLOW);
+}
+#endif
+
+#ifdef HAVE_LUTIMES
+int do_lutimes(const char *fname, time_t modtime, uint32 mod_nsec)
+{
+ struct timeval t[2];
+
+ if (dry_run) return 0;
+ RETURN_ERROR_IF_RO_OR_LO;
+
+ t[0].tv_sec = time(NULL);
+ t[0].tv_usec = 0;
+ t[1].tv_sec = modtime;
+ t[1].tv_usec = mod_nsec / 1000;
+ return lutimes(fname, t);
+}
+#endif
+
+#ifdef HAVE_UTIMES
+int do_utimes(const char *fname, time_t modtime, uint32 mod_nsec)
+{
+ struct timeval t[2];
+
+ if (dry_run) return 0;
+ RETURN_ERROR_IF_RO_OR_LO;
+
+ t[0].tv_sec = time(NULL);
+ t[0].tv_usec = 0;
+ t[1].tv_sec = modtime;
+ t[1].tv_usec = mod_nsec / 1000;
+ return utimes(fname, t);
+}
+
+#elif defined HAVE_UTIME
+int do_utime(const char *fname, time_t modtime, UNUSED(uint32 mod_nsec))
+{
+#ifdef HAVE_STRUCT_UTIMBUF
+ struct utimbuf tbuf;
+#else
+ time_t t[2];
+#endif
+
+ if (dry_run) return 0;
+ RETURN_ERROR_IF_RO_OR_LO;
+
+# ifdef HAVE_STRUCT_UTIMBUF
+ tbuf.actime = time(NULL);
+ tbuf.modtime = modtime;
+ return utime(fname, &tbuf);
+# else
+ t[0] = time(NULL);
+ t[1] = modtime;
+ return utime(fname, t);
+# endif
+}
+
+#else
+#error Need utimes or utime function.
+#endif
+
+#ifdef SUPPORT_PREALLOCATION
+int do_fallocate(int fd, OFF_T offset, OFF_T length)
{
-#if HAVE_BROKEN_READDIR
- return (di->d_name - 2);
+#ifdef FALLOC_FL_KEEP_SIZE
+#define DO_FALLOC_OPTIONS FALLOC_FL_KEEP_SIZE
+#else
+#define DO_FALLOC_OPTIONS 0
+#endif
+ RETURN_ERROR_IF(dry_run, 0);
+ RETURN_ERROR_IF_RO_OR_LO;
+#if defined HAVE_FALLOCATE
+ return fallocate(fd, DO_FALLOC_OPTIONS, offset, length);
+#elif defined HAVE_SYS_FALLOCATE
+ return syscall(SYS_fallocate, fd, DO_FALLOC_OPTIONS, (loff_t)offset, (loff_t)length);
+#elif defined HAVE_EFFICIENT_POSIX_FALLOCATE
+ return posix_fallocate(fd, offset, length);
#else
- return di->d_name;
+#error Coding error in SUPPORT_PREALLOCATION logic.
#endif
}
+#endif
+
+int do_open_nofollow(const char *pathname, int flags)
+{
+#ifndef O_NOFOLLOW
+ struct stat f_st, l_st;
+#endif
+ int fd;
+
+ if (flags != O_RDONLY) {
+ RETURN_ERROR_IF(dry_run, 0);
+ RETURN_ERROR_IF_RO_OR_LO;
+#ifndef O_NOFOLLOW
+ /* This function doesn't support write attempts w/o O_NOFOLLOW. */
+ errno = EINVAL;
+ return -1;
+#endif
+ }
+
+#ifdef O_NOFOLLOW
+ fd = open(pathname, flags|O_NOFOLLOW);
+#else
+ if ((fd = open(pathname, flags)) < 0)
+ return fd;
+
+ if (do_fstat(fd, &f_st) < 0) {
+ close_and_return_error:
+ {
+ int save_errno = errno;
+ close(fd);
+ errno = save_errno;
+ }
+ return -1;
+ }
+ if (do_lstat(pathname, &l_st) < 0)
+ goto close_and_return_error;
+ if (S_ISLNK(l_st.st_mode)) {
+ errno = ELOOP;
+ goto close_and_return_error;
+ }
+ if (l_st.st_dev != f_st.st_dev || l_st.st_ino != f_st.st_ino) {
+ errno = EINVAL;
+ goto close_and_return_error;
+ }
+#endif
+
+ return fd;
+}
git.samba.org / rsync.git / blobdiff