#include <unistd.h>

#include <sys/types.h>

#include <fcntl.h>

#include <stdlib.h>

#include <stdio.h>

#include <errno.h>

#include <string.h>

#include <asm/page.h>

#include "selinux_internal.h"

#include "policy.h"

#include <limits.h>

int security_compute_relabel_raw(security_context_t scon,

                                 security_context_t tcon,

                                 security_class_t tclass,

                                 security_context_t *newcon)

{

	char path[PATH_MAX];

	char *buf;

	size_t size;

	int fd, ret;

	snprintf(path, sizeof path, "%s/relabel", selinux_mnt);

	fd = open(path, O_RDWR);

	if (fd < 0)

		return -1;

	size = PAGE_SIZE;

	buf = malloc(size);

	if (!buf) {

		ret = -1;

		goto out;

	}

	snprintf(buf, size, "%s %s %hu", scon, tcon, tclass);

	ret = write(fd, buf, strlen(buf));

	if (ret < 0) 

		goto out2;

	memset(buf, 0, size);

	ret = read(fd, buf, size-1);

	if (ret < 0)

		goto out2;

	*newcon = strdup(buf);

	if (!*newcon) {

		ret = -1;

		goto out2;

	}

	ret = 0;

out2:

	free(buf);

out:

	close(fd);

	return ret;

}

hidden_def(security_compute_relabel_raw)

int security_compute_relabel(security_context_t scon,

                             security_context_t tcon,

                             security_class_t tclass,

                             security_context_t *newcon)

{

	int ret;

	security_context_t rscon = scon;

	security_context_t rtcon = tcon;

	security_context_t rnewcon;

	if (context_translations) {

		if (trans_to_raw_context(scon, &rscon))

			return -1;

		if (trans_to_raw_context(tcon, &rtcon)) {

			freecon(rscon);

			return -1;

		}

	}

 	ret = security_compute_relabel_raw(rscon, rtcon, tclass, &rnewcon);

	if (context_translations) {

		freecon(rscon);

		freecon(rtcon);

		if (!ret) {

			if (raw_to_trans_context(rnewcon, newcon)) {

				*newcon = NULL;

				ret = -1;

			}

			freecon(rnewcon);

		}

	} else if (!ret)

		*newcon = rnewcon;

	return ret;

}