Rename SELinux source files

The name rc-selinux-util.* is a bit long, so I renamed the source files
to rc-selinux.*

X-Gentoo-Bug: 516956
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=516956

src/rc/rc-selinux.c

@@ -0,0 +1,126 @@
+/*
+  rc-selinux.c
+  SELinux helpers to get and set contexts.
+*/
+
+/*
+ * Copyright (c) 2014 Jason Zaman <jason@perfinion.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <stddef.h>
+#include <errno.h>
+
+#include <sys/stat.h>
+
+#include <selinux/selinux.h>
+#include <selinux/label.h>
+
+#include "rc-selinux.h"
+
+static struct selabel_handle *hnd = NULL;
+
+int
+selinux_util_label(const char *path)
+{
+	int retval = 0;
+	int enforce;
+	struct stat st;
+	security_context_t con;
+
+	enforce = security_getenforce();
+	if (retval < 0)
+		return retval;
+
+	if (NULL == hnd)
+		return (enforce) ? -1 : 0;
+
+	retval = lstat(path, &st);
+	if (retval < 0) {
+		if (ENOENT == errno)
+			return 0;
+		return (enforce) ? -1 : 0;
+	}
+
+	/* lookup the context */
+	retval = selabel_lookup_raw(hnd, &con, path, st.st_mode);
+	if (retval < 0) {
+		if (ENOENT == errno)
+			return 0;
+		return (enforce) ? -1 : 0;
+	}
+
+	/* apply the context */
+	retval = lsetfilecon(path, con);
+	freecon(con);
+	if (retval < 0) {
+		if (ENOENT == errno)
+			return 0;
+		if (ENOTSUP == errno)
+			return 0;
+		return (enforce) ? -1 : 0;
+	}
+
+	return 0;
+}
+
+/*
+ * Open the label handle
+ * returns 1 on success, 0 if no selinux, negative on error
+ */
+int
+selinux_util_open(void)
+{
+	int retval = 0;
+
+	retval = is_selinux_enabled();
+	if (retval <= 0)
+		return retval;
+
+	hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0);
+	if (NULL == hnd)
+		return -2;
+
+	return 1;
+}
+
+/*
+ * Close the label handle
+ * returns 1 on success, 0 if no selinux, negative on error
+ */
+int
+selinux_util_close(void)
+{
+	int retval = 0;
+
+	retval = is_selinux_enabled();
+	if (retval <= 0)
+		return retval;
+
+	if (hnd) {
+		selabel_close(hnd);
+		hnd = NULL;
+	}
+
+	return 0;
+}