mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-01 08:27:59 +00:00
112 lines
4.5 KiB
C
112 lines
4.5 KiB
C
/*
|
|
* Copyright (c) 1995
|
|
* A.R. Gordon (andrew.gordon@net-tel.co.uk). 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
|
|
|
|
#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 FileLayout. 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 */
|
|
unsigned char notifyData[16]; /* Opaque data from caller */
|
|
} MonList;
|
|
|
|
typedef struct
|
|
{
|
|
char hostname[SM_MAXSTRLEN + 1]; /* Name of monitored host */
|
|
int notifyReqd; /* TRUE if we've crashed and not yet */
|
|
/* informed the monitored host */
|
|
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 ourState; /* State number as defined in statd protocol */
|
|
int noOfHosts; /* Number of elements in hosts[] */
|
|
char reserved[248]; /* Reserved for future use */
|
|
HostInfo hosts[1]; /* vector of monitored hosts */
|
|
} FileLayout;
|
|
|
|
#define HEADER_LEN (sizeof(FileLayout) - sizeof(HostInfo))
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
/* Global variables */
|
|
|
|
extern FileLayout *status_info; /* The mmap()ed status file */
|
|
|
|
extern int debug; /* =1 to enable diagnostics to syslog */
|
|
|
|
/* Function prototypes */
|
|
|
|
extern HostInfo *find_host(char * /*hostname*/, int /*create*/);
|
|
extern void init_file(const char * /*filename*/);
|
|
extern void notify_hosts(void);
|
|
extern void sync_file(void);
|
|
extern int sm_check_hostname(struct svc_req *req, char *arg);
|