1 files changed, 87 insertions, 0 deletions
diff --git a/lib/isc/unix/fsaccess.c b/lib/isc/unix/fsaccess.c
new file mode 100644
index 0000000..306cdfd
--- /dev/null
+++ b/lib/isc/unix/fsaccess.c
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0.  If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#include <errno.h>
+#include <stdbool.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "errno2result.h"
+
+/*! \file
+ * \brief
+ * The OS-independent part of the API is in lib/isc.
+ */
+#include "../fsaccess.c"
+
+isc_result_t
+isc_fsaccess_set(const char *path, isc_fsaccess_t access) {
+	struct stat statb;
+	mode_t mode;
+	bool is_dir = false;
+	isc_fsaccess_t bits;
+	isc_result_t result;
+
+	if (stat(path, &statb) != 0) {
+		return (isc__errno2result(errno));
+	}
+
+	if ((statb.st_mode & S_IFDIR) != 0) {
+		is_dir = true;
+	} else if ((statb.st_mode & S_IFREG) == 0) {
+		return (ISC_R_INVALIDFILE);
+	}
+
+	result = check_bad_bits(access, is_dir);
+	if (result != ISC_R_SUCCESS) {
+		return (result);
+	}
+
+	/*
+	 * Done with checking bad bits.  Set mode_t.
+	 */
+	mode = 0;
+
+#define SET_AND_CLEAR1(modebit)     \
+	if ((access & bits) != 0) { \
+		mode |= modebit;    \
+		access &= ~bits;    \
+	}
+#define SET_AND_CLEAR(user, group, other) \
+	SET_AND_CLEAR1(user);             \
+	bits <<= STEP;                    \
+	SET_AND_CLEAR1(group);            \
+	bits <<= STEP;                    \
+	SET_AND_CLEAR1(other);
+
+	bits = ISC_FSACCESS_READ | ISC_FSACCESS_LISTDIRECTORY;
+
+	SET_AND_CLEAR(S_IRUSR, S_IRGRP, S_IROTH);
+
+	bits = ISC_FSACCESS_WRITE | ISC_FSACCESS_CREATECHILD |
+	       ISC_FSACCESS_DELETECHILD;
+
+	SET_AND_CLEAR(S_IWUSR, S_IWGRP, S_IWOTH);
+
+	bits = ISC_FSACCESS_EXECUTE | ISC_FSACCESS_ACCESSCHILD;
+
+	SET_AND_CLEAR(S_IXUSR, S_IXGRP, S_IXOTH);
+
+	INSIST(access == 0);
+
+	if (chmod(path, mode) < 0) {
+		return (isc__errno2result(errno));
+	}
+
+	return (ISC_R_SUCCESS);
+}