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/* $OpenBSD: sync.h,v 1.5 2016/10/04 22:47:51 krw Exp $ */
/*
* Copyright (c) 2008, Bob Beck <beck@openbsd.org>
* Copyright (c) 2006, 2007 Reyk Floeter <reyk@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _DHCPD_SYNC
#define _DHCPD_SYNC
/*
* dhcpd(8) synchronisation protocol.
*
* This protocol has been designed for realtime synchronisation between
* multiple machines running dhcpd(8), running the same config.
* It is a simple Type-Length-Value based protocol, it allows easy
* extension with future subtypes and bulk transfers by sending multiple
* entries at once. The unencrypted messages will be authenticated using
* HMAC-SHA1.
*
*/
#define DHCP_SYNC_VERSION 1
#define DHCP_SYNC_MCASTADDR "224.0.1.240" /* XXX choose valid address */
#define DHCP_SYNC_MCASTTTL IP_DEFAULT_MULTICAST_TTL
#define DHCP_SYNC_HMAC_LEN 20 /* SHA1 */
#define DHCP_SYNC_MAXSIZE 1408
#define DHCP_SYNC_KEY "/var/db/dhcpd.key"
#define DHCP_ALIGNBYTES (15)
#define DHCP_ALIGN(p) (((u_int)(p) + DHCP_ALIGNBYTES) &~ DHCP_ALIGNBYTES)
struct dhcp_synchdr {
u_int8_t sh_version;
u_int8_t sh_af;
u_int16_t sh_length;
u_int32_t sh_counter;
u_int8_t sh_hmac[DHCP_SYNC_HMAC_LEN];
u_int8_t sh_pad[4];
} __packed;
struct dhcp_synctlv_hdr {
u_int16_t st_type;
u_int16_t st_length;
} __packed;
struct dhcp_synctlv_lease {
u_int16_t lv_type;
u_int16_t lv_length;
u_int32_t lv_starts, lv_ends, lv_timestamp;
struct iaddr lv_ip_addr;
struct hardware lv_hardware_addr;
} __packed;
#define DHCP_SYNC_END 0x0000
#define DHCP_SYNC_LEASE 0x0001
extern int syncfd;
extern int sync_init(const char *, const char *, u_short);
extern int sync_addhost(const char *, u_short);
extern void sync_recv(void);
extern void sync_lease(struct lease *);
#endif /* _DHCPD_SYNC */
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