| Stephen Smalley | f074036 | 2012-01-04 12:30:47 -0500 | [diff] [blame] | 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 | |
| Stephen Smalley | ab40ea9 | 2014-02-19 09:16:17 -0500 | [diff] [blame] | 10 | int lgetfilecon(const char *path, char ** context) |
| Stephen Smalley | f074036 | 2012-01-04 12:30:47 -0500 | [diff] [blame] | 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 = EOPNOTSUPP; |
| 43 | ret = -1; |
| 44 | } |
| 45 | if (ret < 0) |
| 46 | free(buf); |
| 47 | else |
| 48 | *context = buf; |
| 49 | return ret; |
| 50 | } |