Imported Upstream version 0.8.0~pre1upstream/0.8.0_pre1

1 files changed, 138 insertions, 0 deletions

diff --git a/src/common/acl.h b/src/common/acl.h
new file mode 100644
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--- /dev/null
+++ b/src/common/acl.h
@@ -0,0 +1,138 @@
+/*  Copyright (C) 2011 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/*!
+ * \file acl.h
+ *
+ * \author Marek Vavrusa <marek.vavrusa@nic.cz>
+ *
+ * \brief Access control lists.
+ *
+ * An access control list is a named structure
+ * for efficient IP address and port matching.
+ *
+ * \addtogroup common_lib
+ * @{
+ */
+
+#ifndef _KNOTD_ACL_H_
+#define _KNOTD_ACL_H_
+
+#include "common/skip-list.h"
+#include "common/sockaddr.h"
+
+/*! \brief ACL rules types. */
+typedef enum acl_rule_t {
+	ACL_ERROR  = -1,
+	ACL_DENY   =  0,
+	ACL_ACCEPT =  1
+} acl_rule_t;
+
+/*! \brief ACL structure. */
+typedef struct acl_t {
+	acl_rule_t default_rule;
+	skip_list_t *rules;
+	const char name[];
+} acl_t;
+
+/*!
+ * \brief Create a new ACL.
+ *
+ * \param default_rule Default rule for address matching.
+ * \param name ACL symbolic name (or NULL).
+ *
+ * \retval New ACL instance when successful.
+ * \retval NULL on errors.
+ */
+acl_t *acl_new(acl_rule_t default_rule, const char *name);
+
+/*!
+ * \brief Delete ACL structure.
+ *
+ * \param acl Pointer to ACL instance.
+ */
+void acl_delete(acl_t **acl);
+
+/*!
+ * \brief Create new ACL rule.
+ *
+ * \todo Support address subnets.
+ *
+ * \param acl Pointer to ACL instance.
+ * \param addr IP address (will be duplicated).
+ * \param rule Rule.
+ *
+ * \retval ACL_ACCEPT if successful.
+ * \retval ACP_ERROR on error.
+ */
+int acl_create(acl_t *acl, const sockaddr_t* addr, acl_rule_t rule);
+
+/*!
+ * \brief Match address against ACL.
+ *
+ * \param acl Pointer to ACL instance.
+ * \param addr IP address.
+ *
+ * \retval ACL_ACCEPT if the address is accepted.
+ * \retval ACL_DENY if the address is not accepted.
+ * \retval ACP_ERROR on error.
+ */
+int acl_match(acl_t *acl, sockaddr_t* addr);
+
+/*!
+ * \brief Truncate ACL.
+ *
+ * All but the default rule will be dropped.
+ *
+ * \param acl Pointer to ACL instance.
+ *
+ * \retval ACL_ACCEPT if successful.
+ * \retval ACP_ERROR on error.
+ */
+int acl_truncate(acl_t *acl);
+
+/*!
+ * \brief Return ACL name.
+ *
+ * \param acl Pointer to ACL instance.
+ *
+ * \retval ACL name.
+ */
+static inline const char* acl_name(acl_t *acl) {
+	if (!acl) {
+		return 0;
+	}
+
+	return acl->name;
+}
+
+/*!
+ * \brief Return ACL rules.
+ *
+ * \param acl Pointer to ACL instance.
+ *
+ * \retval ACL rules skip-list.
+ */
+static inline skip_list_t* acl_rules(acl_t *acl) {
+        if (!acl) {
+                return 0;
+        }
+
+        return acl->rules;
+}
+
+#endif /* _KNOTD_ACL_H_ */
+
+/*! @} */