1/*	$NetBSD: statd.h,v 1.1 1997/03/10 06:28:32 scottr Exp $	*/
2
3/*
4 * Copyright (c) 1995
5 *	A.R. Gordon (andrew.gordon@net-tel.co.uk).  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed for the FreeBSD project
18 * 4. Neither the name of the author nor the names of any co-contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY ANDREW GORDON AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 */
35
36#include "sm_inter.h"
37
38/* ------------------------------------------------------------------------- */
39/*
40 * Data structures for recording monitored hosts
41 *
42 * The information held by the status monitor comprises a list of hosts
43 * that we have been asked to monitor, and, associated with each monitored
44 * host, one or more clients to be called back if the monitored host crashes.
45 *
46 * The list of monitored hosts must be retained over a crash, so that upon
47 * re-boot we can call the SM_NOTIFY procedure in all those hosts so as to
48 * cause them to start recovery processing.  On the other hand, the client
49 * call-backs are not required to be preserved: they are assumed (in the
50 * protocol design) to be local processes which will have crashed when
51 * we did, and so are discarded on restart.
52 *
53 * We handle this by keeping the list of monitored hosts in a file
54 * (/var/statd.state) which is mmap()ed and whose format is described
55 * by the typedef Header.  The lists of client callbacks are chained
56 * off this structure, but are held in normal memory and so will be
57 * lost after a re-boot.  Hence the actual values of MonList * pointers
58 * in the copy on disc have no significance, but their NULL/non-NULL
59 * status indicates whether this host is actually being monitored or if it
60 * is an empty slot in the file.
61 */
62
63typedef struct MonList_s {
64	struct MonList_s *next;		/* Next in list or NULL */
65	char	notifyHost[SM_MAXSTRLEN + 1]; /* Host to notify */
66	int     notifyProg;		/* RPC program number to call */
67	int     notifyVers;		/* version number */
68	int     notifyProc;		/* procedure number */
69	u_char	notifyData[16];		/* Opaque data from caller */
70}       MonList;
71
72typedef struct {
73	int     notifyReqd;	/* Time of our next attempt or 0
74				   informed the monitored host */
75	int	attempts;	/* Number of attempts we tried so far */
76	MonList *monList;	/* List of clients to inform if we
77				   hear that the monitored host has
78				   crashed, NULL if no longer monitored	 */
79}       HostInfo;
80
81
82/* Overall file layout. */
83
84typedef struct {
85	int	magic;		/* Zero magic */
86	int	ourState;	/* State number as defined in statd protocol */
87}       Header;
88
89/* ------------------------------------------------------------------------- */
90
91/* Global variables */
92
93extern int	debug;		/* = 1 to enable diagnostics to syslog */
94extern struct sigaction sa;
95extern Header status_info;
96
97/* Function prototypes */
98
99/* stat_proc.c */
100struct sm_stat_res *sm_stat_1_svc __P((sm_name *, struct svc_req *));
101struct sm_stat_res *sm_mon_1_svc __P((mon *, struct svc_req *));
102struct sm_stat *sm_unmon_1_svc __P((mon_id *, struct svc_req *));
103struct sm_stat *sm_unmon_all_1_svc __P((my_id *, struct svc_req *));
104void *sm_simu_crash_1_svc __P((void *, struct svc_req *));
105void *sm_notify_1_svc __P((stat_chge *, struct svc_req *));
106int	do_unmon __P((char *, HostInfo *, void *));
107
108/* statd.c */
109void notify_handler __P((int));
110void sync_file __P((void));
111void unmon_hosts __P((void));
112void change_host __P((char *, HostInfo *));
113HostInfo *find_host __P((char *, HostInfo *));
114void reset_database __P((void));
115
116void sm_prog_1 __P((struct svc_req *, SVCXPRT *));
117
118#define NO_ALARM sa.sa_handler == SIG_DFL ? 0 : (sa.sa_handler = SIG_IGN, sigaction(SIGALRM, &sa, NULL))
119#define ALARM sa.sa_handler == SIG_DFL ? 0 : (sa.sa_handler = notify_handler, sigaction(SIGALRM, &sa, NULL))
120#define CLR_ALARM sa.sa_handler == SIG_DFL ? 0 : (sa.sa_handler = SIG_DFL, sigaction(SIGALRM, &sa, NULL))
121