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Diffstat (limited to 'usr.sbin/rpc.statd/statd.h')
-rw-r--r-- | usr.sbin/rpc.statd/statd.h | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/usr.sbin/rpc.statd/statd.h b/usr.sbin/rpc.statd/statd.h new file mode 100644 index 0000000..a82d760 --- /dev/null +++ b/usr.sbin/rpc.statd/statd.h @@ -0,0 +1,111 @@ +/* + * 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); |