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/* 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_ */
/*! @} */
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