/*      $NetBSD: statd.h,v 1.3 2018/01/23 21:06:26 sevan Exp $  */

/*
* Copyright (c) 1995
*      A.R. Gordon ([email protected]).  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed for the FreeBSD project
* 4. Neither the name of the author nor the names of any co-contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY ANDREW GORDON AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/

#include "sm_inter.h"

/* ------------------------------------------------------------------------- */
/*
* Data structures for recording monitored hosts
*
* The information held by the status monitor comprises a list of hosts
* that we have been asked to monitor, and, associated with each monitored
* host, one or more clients to be called back if the monitored host crashes.
*
* The list of monitored hosts must be retained over a crash, so that upon
* re-boot we can call the SM_NOTIFY procedure in all those hosts so as to
* cause them to start recovery processing.  On the other hand, the client
* call-backs are not required to be preserved: they are assumed (in the
* protocol design) to be local processes which will have crashed when
* we did, and so are discarded on restart.
*
* We handle this by keeping the list of monitored hosts in a file
* (/var/statd.state) which is mmap()ed and whose format is described
* by the typedef Header.  The lists of client callbacks are chained
* off this structure, but are held in normal memory and so will be
* lost after a re-boot.  Hence the actual values of MonList * pointers
* in the copy on disc have no significance, but their NULL/non-NULL
* status indicates whether this host is actually being monitored or if it
* is an empty slot in the file.
*/

typedef struct MonList_s {
       struct MonList_s *next;         /* Next in list or NULL */
       char    notifyHost[SM_MAXSTRLEN + 1]; /* Host to notify */
       int     notifyProg;             /* RPC program number to call */
       int     notifyVers;             /* version number */
       int     notifyProc;             /* procedure number */
       u_char  notifyData[16];         /* Opaque data from caller */
}       MonList;

typedef struct {
       int     notifyReqd;     /* Time of our next attempt or 0
                                  informed the monitored host */
       int     attempts;       /* Number of attempts we tried so far */
       MonList *monList;       /* List of clients to inform if we
                                  hear that the monitored host has
                                  crashed, NULL if no longer monitored  */
}       HostInfo;


/* Overall file layout. */

typedef struct {
       int     magic;          /* Zero magic */
       int     ourState;       /* State number as defined in statd protocol */
}       Header;

/* ------------------------------------------------------------------------- */

/* Global variables */

extern int      debug;          /* = 1 to enable diagnostics to syslog */
extern struct sigaction sa;
extern Header status_info;

/* Function prototypes */

/* stat_proc.c */
struct sm_stat_res *sm_stat_1_svc(sm_name *, struct svc_req *);
struct sm_stat_res *sm_mon_1_svc(mon *, struct svc_req *);
struct sm_stat *sm_unmon_1_svc(mon_id *, struct svc_req *);
struct sm_stat *sm_unmon_all_1_svc(my_id *, struct svc_req *);
void *sm_simu_crash_1_svc(void *, struct svc_req *);
void *sm_notify_1_svc(stat_chge *, struct svc_req *);
int     do_unmon(char *, HostInfo *, void *);

/* statd.c */
void notify_handler(int);
void sync_file(void);
void unmon_hosts(void);
void change_host(char *, HostInfo *);
HostInfo *find_host(char *, HostInfo *);
void reset_database(void);

void sm_prog_1(struct svc_req *, SVCXPRT *);

#define NO_ALARM sa.sa_handler == SIG_DFL ? 0 : (sa.sa_handler = SIG_IGN, sigaction(SIGALRM, &sa, NULL))
#define ALARM sa.sa_handler == SIG_DFL ? 0 : (sa.sa_handler = notify_handler, sigaction(SIGALRM, &sa, NULL))
#define CLR_ALARM sa.sa_handler == SIG_DFL ? 0 : (sa.sa_handler = SIG_DFL, sigaction(SIGALRM, &sa, NULL))

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