1#include <unistd.h>
2#include <fcntl.h>
3#include <string.h>
4#include <stdlib.h>
5#include <errno.h>
6#include <sys/socket.h>
7#include "selinux_internal.h"
8#include "policy.h"
9
10#ifndef SO_PEERSEC
11#define SO_PEERSEC 31
12#endif
13
14int getpeercon(int fd, char ** context)
15{
16	char *buf;
17	socklen_t size;
18	ssize_t ret;
19
20	size = INITCONTEXTLEN + 1;
21	buf = malloc(size);
22	if (!buf)
23		return -1;
24	memset(buf, 0, size);
25
26	ret = getsockopt(fd, SOL_SOCKET, SO_PEERSEC, buf, &size);
27	if (ret < 0 && errno == ERANGE) {
28		char *newbuf;
29
30		newbuf = realloc(buf, size);
31		if (!newbuf)
32			goto out;
33
34		buf = newbuf;
35		memset(buf, 0, size);
36		ret = getsockopt(fd, SOL_SOCKET, SO_PEERSEC, buf, &size);
37	}
38      out:
39	if (ret < 0)
40		free(buf);
41	else
42		*context = buf;
43	return ret;
44}
45
46