124 lines
4.8 KiB
C
124 lines
4.8 KiB
C
/*
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* Copyright (c) 1995
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* A.R. Gordon (andrew.gordon@net-tel.co.uk). All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the FreeBSD project
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY ANDREW GORDON AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <rpcsvc/sm_inter.h>
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/* These pieces are missing from the distributed sm_inter.x, which */
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/* omits the SM_NOTIFY procedure used between cooperating rpc.statd's */
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#define SM_NOTIFY ((u_long)6)
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extern void *sm_notify_1();
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struct stat_chge
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{
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char *mon_name;
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int state;
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};
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typedef struct stat_chge stat_chge;
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bool_t xdr_stat_chge();
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/* ------------------------------------------------------------------------- */
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/*
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Data structures for recording monitored hosts
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The information held by the status monitor comprises a list of hosts
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that we have been asked to monitor, and, associated with each monitored
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host, one or more clients to be called back if the monitored host crashes.
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The list of monitored hosts must be retained over a crash, so that upon
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re-boot we can call the SM_NOTIFY procedure in all those hosts so as to
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cause them to start recovery processing. On the other hand, the client
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call-backs are not required to be preserved: they are assumed (in the
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protocol design) to be local processes which will have crashed when
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we did, and so are discarded on restart.
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We handle this by keeping the list of monitored hosts in a file
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(/var/statd.state) which is mmap()ed and whose format is described
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by the typedef FileLayout. The lists of client callbacks are chained
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off this structure, but are held in normal memory and so will be
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lost after a re-boot. Hence the actual values of MonList * pointers
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in the copy on disc have no significance, but their NULL/non-NULL
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status indicates whether this host is actually being monitored or if it
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is an empty slot in the file.
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*/
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typedef struct MonList_s
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{
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struct MonList_s *next; /* Next in list or NULL */
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char notifyHost[SM_MAXSTRLEN + 1]; /* Host to notify */
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int notifyProg; /* RPC program number to call */
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int notifyVers; /* version number */
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int notifyProc; /* procedure number */
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unsigned char notifyData[16]; /* Opaque data from caller */
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} MonList;
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typedef struct
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{
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char hostname[SM_MAXSTRLEN + 1]; /* Name of monitored host */
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int notifyReqd; /* TRUE if we've crashed and not yet */
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/* informed the monitored host */
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MonList *monList; /* List of clients to inform if we */
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/* hear that the monitored host has */
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/* crashed, NULL if no longer monitored */
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} HostInfo;
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/* Overall file layout. */
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typedef struct
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{
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int ourState; /* State number as defined in statd protocol */
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int noOfHosts; /* Number of elements in hosts[] */
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char reserved[248]; /* Reserved for future use */
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HostInfo hosts[1]; /* vector of monitored hosts */
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} FileLayout;
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#define HEADER_LEN (sizeof(FileLayout) - sizeof(HostInfo))
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/* ------------------------------------------------------------------------- */
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/* Global variables */
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extern FileLayout *status_info; /* The mmap()ed status file */
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extern int debug; /* =1 to enable diagnostics to syslog */
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/* Function prototypes */
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extern HostInfo *find_host(char * /*hostname*/, int /*create*/);
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extern void init_file(char * /*filename*/);
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extern void notify_hosts(void);
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extern void sync_file(void);
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