udev_utils_file.c revision 726687ad48bdececed1e7e44387c50e009e28208
/*
* Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
*
* 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 version 2 of the License.
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <stddef.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include "udev.h"
#include "udev_selinux.h"
int create_path(const char *path)
{
char p[PATH_SIZE];
char *pos;
struct stat stats;
int ret;
strlcpy(p, path, sizeof(p));
pos = strrchr(p, '/');
if (pos == p || pos == NULL)
return 0;
while (pos[-1] == '/')
pos--;
pos[0] = '\0';
dbg("stat '%s'\n", p);
if (stat(p, &stats) == 0 && (stats.st_mode & S_IFMT) == S_IFDIR)
return 0;
if (create_path(p) != 0)
return -1;
dbg("mkdir '%s'\n", p);
selinux_setfscreatecon(p, NULL, S_IFDIR|0755);
ret = mkdir(p, 0755);
selinux_resetfscreatecon();
if (ret == 0)
return 0;
if (errno == EEXIST)
if (stat(p, &stats) == 0 && (stats.st_mode & S_IFMT) == S_IFDIR)
return 0;
return -1;
}
int delete_path(const char *path)
{
char p[PATH_SIZE];
char *pos;
int retval;
strcpy (p, path);
pos = strrchr(p, '/');
if (pos == p || pos == NULL)
return 0;
while (1) {
*pos = '\0';
pos = strrchr(p, '/');
/* don't remove the last one */
if ((pos == p) || (pos == NULL))
break;
/* remove if empty */
retval = rmdir(p);
if (errno == ENOENT)
retval = 0;
if (retval) {
if (errno == ENOTEMPTY)
return 0;
err("rmdir(%s) failed: %s\n", p, strerror(errno));
break;
}
dbg("removed '%s'\n", p);
}
return 0;
}
/* Reset permissions on the device node, before unlinking it to make sure,
* that permisions of possible hard links will be removed too.
*/
int unlink_secure(const char *filename)
{
int retval;
retval = chown(filename, 0, 0);
if (retval)
err("chown(%s, 0, 0) failed: %s\n", filename, strerror(errno));
retval = chmod(filename, 0000);
if (retval)
err("chmod(%s, 0000) failed: %s\n", filename, strerror(errno));
retval = unlink(filename);
if (errno == ENOENT)
retval = 0;
if (retval)
err("unlink(%s) failed: %s\n", filename, strerror(errno));
return retval;
}
int file_map(const char *filename, char **buf, size_t *bufsize)
{
struct stat stats;
int fd;
fd = open(filename, O_RDONLY);
if (fd < 0) {
return -1;
}
if (fstat(fd, &stats) < 0) {
close(fd);
return -1;
}
*buf = mmap(NULL, stats.st_size, PROT_READ, MAP_SHARED, fd, 0);
if (*buf == MAP_FAILED) {
close(fd);
return -1;
}
*bufsize = stats.st_size;
close(fd);
return 0;
}
void file_unmap(void *buf, size_t bufsize)
{
munmap(buf, bufsize);
}
/* return number of chars until the next newline, skip escaped newline */
size_t buf_get_line(const char *buf, size_t buflen, size_t cur)
{
int escape = 0;
size_t count;
for (count = cur; count < buflen; count++) {
if (!escape && buf[count] == '\n')
break;
if (buf[count] == '\\')
escape = 1;
else
escape = 0;
}
return count - cur;
}