redis_ippool.h

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#pragma once
/*
 *   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 2 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, write to the Free Software
 *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
/**
 * $Id: 31f45df57f6ae956d692be5048c904442b170ace $
 * @file cluster.h
 * @brief Common functions for interacting with Redis cluster via Hiredis
 *
 * @author Arran Cudbard-Bell
 *
 * @copyright 2015 Arran Cudbard-Bell (a.cudbardb@freeradius.org)
 * @copyright 2015 The FreeRADIUS server project
 */
RCSIDH(redis_ippool_h, "$Id: 31f45df57f6ae956d692be5048c904442b170ace $")
 
/*
 *      Can't stringify enum macros *sigh*
 */
#define _IPPOOL_RCODE_SUCCESS           0
#define _IPPOOL_RCODE_NOT_FOUND         -1
#define _IPPOOL_RCODE_EXPIRED           -2
#define _IPPOOL_RCODE_DEVICE_MISMATCH   -3
#define _IPPOOL_RCODE_POOL_EMPTY        -4
#define _IPPOOL_RCODE_FAIL              -5
 
typedef enum {
        IPPOOL_RCODE_SUCCESS = _IPPOOL_RCODE_SUCCESS,
        IPPOOL_RCODE_NOT_FOUND = _IPPOOL_RCODE_NOT_FOUND,
        IPPOOL_RCODE_EXPIRED = _IPPOOL_RCODE_EXPIRED,
        IPPOOL_RCODE_DEVICE_MISMATCH = _IPPOOL_RCODE_DEVICE_MISMATCH,
        IPPOOL_RCODE_POOL_EMPTY = _IPPOOL_RCODE_POOL_EMPTY,
        IPPOOL_RCODE_FAIL = _IPPOOL_RCODE_FAIL
} ippool_rcode_t;
 
typedef enum {
        POOL_ACTION_ALLOCATE = 1,
        POOL_ACTION_UPDATE = 2,
        POOL_ACTION_RELEASE = 3,
        POOL_ACTION_BULK_RELEASE = 4,
} ippool_action_t;
 
#define IPPOOL_MAX_KEY_PREFIX_SIZE      128
#define IPPOOL_POOL_KEY                 "pool"
#define IPPOOL_ADDRESS_KEY              "ip"
#define IPPOOL_OWNER_KEY                "device"
#define IPPOOL_STATIC_BIT               0x10000000000000   /* A high bit which Redis ZSCORE will represent accurately*/
 
/** {prefix}:pool
 */
#define IPPOOL_MAX_POOL_KEY_SIZE        IPPOOL_MAX_KEY_PREFIX_SIZE + (sizeof("{}:" IPPOOL_POOL_KEY) - 1) + 2
 
/** {prefix}:ipaddr/prefix
 */
#define IPPOOL_MAX_IP_KEY_SIZE          IPPOOL_MAX_KEY_PREFIX_SIZE + (sizeof("{}:" IPPOOL_ADDRESS_KEY ":") - 1) + INET6_ADDRSTRLEN + 4
 
/** {prefix}:device
 */
#define IPPOOL_MAX_OWNER_KEY_SIZE       IPPOOL_MAX_KEY_PREFIX_SIZE + (sizeof("{}:" IPPOOL_OWNER_KEY ":") - 1) + 128
 
 
#define IPADDR_LEN(_af) ((_af == AF_UNSPEC) ? 0 : ((_af == AF_INET6) ? 128 : 32))
 
/** Wrap the prefix in {} and add the pool suffix
 *
 */
#define IPPOOL_BUILD_KEY(_buff, _p, _key, _key_len) \
do { \
        *_p++ = '{'; \
        memcpy(_p, _key, _key_len); \
        _p += _key_len; \
        *_p++ = '}'; \
        *_p++ = ':'; \
        memcpy(_p, IPPOOL_POOL_KEY, sizeof(IPPOOL_POOL_KEY) - 1); \
        _p +=  sizeof(IPPOOL_POOL_KEY) - 1; \
} while (0)
 
/** Build the IP key {prefix}:ip
 *
 */
#define IPPOOL_BUILD_IP_KEY(_buff, _p, _key, _key_len, _ip) \
do { \
        ssize_t _slen; \
        *_p++ = '{'; \
        memcpy(_p, _key, _key_len); \
        _p += _key_len; \
        _slen = strlcpy((char *)_p, "}:"IPPOOL_ADDRESS_KEY":", sizeof(_buff) - (_p - _buff)); \
        if (is_truncated((size_t)_slen, sizeof(_buff) - (_p - _buff))) { \
                REDEBUG("IP key too long"); \
                ret = IPPOOL_RCODE_FAIL; \
                goto finish; \
        } \
        _p += (size_t)_slen;\
        _slen = fr_pair_print_value_quoted(&FR_SBUFF_OUT((char *)_p, sizeof(_buff) - (_p - _buff)), _ip, T_BARE_WORD); \
        if (_slen < 0) { \
                REDEBUG("IP key too long"); \
                ret = IPPOOL_RCODE_FAIL; \
                goto finish; \
        } \
        _p += (size_t)_slen;\
} while (0)
 
/** If the prefix is as wide as the AF data size then print it without CIDR notation.
 *
 */
#define IPPOOL_SPRINT_IP(_buff, _ip, _prefix) \
do { \
        if (_prefix == IPADDR_LEN((_ip)->af)) { \
                inet_ntop((_ip)->af, &((_ip)->addr), _buff, sizeof(_buff)); \
        } else { \
                uint8_t _net = (_ip)->prefix; \
                (_ip)->prefix = _prefix; \
                fr_inet_ntop_prefix(_buff, sizeof(_buff), _ip); \
                (_ip)->prefix = _net; \
        } \
} while (0)