Home | History | Annotate | Line # | Download | only in rpc.statd 
      1 /*	$NetBSD: statd.h,v 1.3 2018/01/23 21:06:26 sevan Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1995
      5  *	A.R. Gordon (andrew.gordon (at) 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 
     63 typedef 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 
     72 typedef 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 
     84 typedef 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 
     93 extern int	debug;		/* = 1 to enable diagnostics to syslog */
     94 extern struct sigaction sa;
     95 extern Header status_info;
     96 
     97 /* Function prototypes */
     98 
     99 /* stat_proc.c */
    100 struct sm_stat_res *sm_stat_1_svc(sm_name *, struct svc_req *);
    101 struct sm_stat_res *sm_mon_1_svc(mon *, struct svc_req *);
    102 struct sm_stat *sm_unmon_1_svc(mon_id *, struct svc_req *);
    103 struct sm_stat *sm_unmon_all_1_svc(my_id *, struct svc_req *);
    104 void *sm_simu_crash_1_svc(void *, struct svc_req *);
    105 void *sm_notify_1_svc(stat_chge *, struct svc_req *);
    106 int	do_unmon(char *, HostInfo *, void *);
    107 
    108 /* statd.c */
    109 void notify_handler(int);
    110 void sync_file(void);
    111 void unmon_hosts(void);
    112 void change_host(char *, HostInfo *);
    113 HostInfo *find_host(char *, HostInfo *);
    114 void reset_database(void);
    115 
    116 void sm_prog_1(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