1 #include <unistd.h>
2 #include <fcntl.h>
3 #include <string.h>
4 #include "selinux_internal.h"
5 #include <stdlib.h>
6 #include <errno.h>
7 #include <sys/xattr.h>
8 #include "policy.h"
9
getfilecon(const char * path,char ** context)10 int getfilecon(const char *path, char ** context)
11 {
12 char *buf;
13 ssize_t size;
14 ssize_t ret;
15
16 size = INITCONTEXTLEN + 1;
17 buf = malloc(size);
18 if (!buf)
19 return -1;
20 memset(buf, 0, size);
21
22 ret = getxattr(path, XATTR_NAME_SELINUX, buf, size - 1);
23 if (ret < 0 && errno == ERANGE) {
24 char *newbuf;
25
26 size = getxattr(path, XATTR_NAME_SELINUX, NULL, 0);
27 if (size < 0)
28 goto out;
29
30 size++;
31 newbuf = realloc(buf, size);
32 if (!newbuf)
33 goto out;
34
35 buf = newbuf;
36 memset(buf, 0, size);
37 ret = getxattr(path, XATTR_NAME_SELINUX, buf, size - 1);
38 }
39 out:
40 if (ret == 0) {
41 /* Re-map empty attribute values to errors. */
42 errno = EOPNOTSUPP;
43 ret = -1;
44 }
45 if (ret < 0)
46 free(buf);
47 else
48 *context = buf;
49 return ret;
50 }
51