1 #include <unistd.h>
2 #include <fcntl.h>
3 #include <string.h>
4 #include <stdlib.h>
5 #include <errno.h>
6 #include <sys/xattr.h>
7 #include "selinux_internal.h"
8 #include "policy.h"
9
lgetfilecon_raw(const char * path,char ** context)10 int lgetfilecon_raw(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 = lgetxattr(path, XATTR_NAME_SELINUX, buf, size - 1);
23 if (ret < 0 && errno == ERANGE) {
24 char *newbuf;
25
26 size = lgetxattr(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 = lgetxattr(path, XATTR_NAME_SELINUX, buf, size - 1);
38 }
39 out:
40 if (ret == 0) {
41 /* Re-map empty attribute values to errors. */
42 errno = ENOTSUP;
43 ret = -1;
44 }
45 if (ret < 0)
46 free(buf);
47 else
48 *context = buf;
49 return ret;
50 }
51
hidden_def(lgetfilecon_raw)52 hidden_def(lgetfilecon_raw)
53
54 int lgetfilecon(const char *path, char ** context)
55 {
56 int ret;
57 char * rcontext = NULL;
58
59 *context = NULL;
60
61 ret = lgetfilecon_raw(path, &rcontext);
62
63 if (ret > 0) {
64 ret = selinux_raw_to_trans_context(rcontext, context);
65 freecon(rcontext);
66 }
67
68 if (ret >= 0 && *context)
69 return strlen(*context) + 1;
70 return ret;
71 }
72