1 /* $NetBSD: statd.h,v 1.2 1997/10/21 20:38:19 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1995 5 * A.R. Gordon (andrew.gordon@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 __P((sm_name *, struct svc_req *)); 101 struct sm_stat_res *sm_mon_1_svc __P((mon *, struct svc_req *)); 102 struct sm_stat *sm_unmon_1_svc __P((mon_id *, struct svc_req *)); 103 struct sm_stat *sm_unmon_all_1_svc __P((my_id *, struct svc_req *)); 104 void *sm_simu_crash_1_svc __P((void *, struct svc_req *)); 105 void *sm_notify_1_svc __P((stat_chge *, struct svc_req *)); 106 int do_unmon __P((char *, HostInfo *, void *)); 107 108 /* statd.c */ 109 void notify_handler __P((int)); 110 void sync_file __P((void)); 111 void unmon_hosts __P((void)); 112 void change_host __P((char *, HostInfo *)); 113 HostInfo *find_host __P((char *, HostInfo *)); 114 void reset_database __P((void)); 115 116 void sm_prog_1 __P((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