stat_proc.c revision 1.6
1 /* $NetBSD: stat_proc.c,v 1.6 2000/06/09 14:02:12 fvdl 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 <sys/cdefs.h> 37 #ifndef lint 38 __RCSID("$NetBSD: stat_proc.c,v 1.6 2000/06/09 14:02:12 fvdl Exp $"); 39 #endif 40 41 #include <errno.h> 42 #include <netdb.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <syslog.h> 47 #include <signal.h> 48 #include <unistd.h> 49 50 #include <rpc/rpc.h> 51 52 #include "statd.h" 53 54 /* sm_stat_1 --------------------------------------------------------------- */ 55 /* 56 * Purpose: RPC call to enquire if a host can be monitored 57 * Returns: TRUE for any hostname that can be looked up to give 58 * an address. 59 */ 60 struct sm_stat_res * 61 sm_stat_1_svc(arg, req) 62 sm_name *arg; 63 struct svc_req *req; 64 { 65 static sm_stat_res res; 66 struct addrinfo *ai; 67 68 NO_ALARM; 69 if (debug) 70 syslog(LOG_DEBUG, "stat called for host %s", arg->mon_name); 71 72 if (getaddrinfo(arg->mon_name, NULL, NULL, &ai) == 0) { 73 res.res_stat = stat_succ; 74 freeaddrinfo(ai); 75 } else { 76 syslog(LOG_ERR, "invalid hostname to sm_stat: %s", 77 arg->mon_name); 78 res.res_stat = stat_fail; 79 } 80 81 res.state = status_info.ourState; 82 ALARM; 83 return (&res); 84 } 85 86 /* sm_mon_1 ---------------------------------------------------------------- */ 87 /* 88 * Purpose: RPC procedure to establish a monitor request 89 * Returns: Success, unless lack of resources prevents 90 * the necessary structures from being set up 91 * to record the request, or if the hostname is not 92 * valid (as judged by gethostbyname()) 93 */ 94 struct sm_stat_res * 95 sm_mon_1_svc(arg, req) 96 mon *arg; 97 struct svc_req *req; 98 { 99 static sm_stat_res res; 100 struct addrinfo *ai; 101 HostInfo *hp, h; 102 MonList *lp; 103 104 NO_ALARM; 105 if (debug) { 106 syslog(LOG_DEBUG, "monitor request for host %s", 107 arg->mon_id.mon_name); 108 syslog(LOG_DEBUG, "recall host: %s prog: %d ver: %d proc: %d", 109 arg->mon_id.my_id.my_name, arg->mon_id.my_id.my_prog, 110 arg->mon_id.my_id.my_vers, arg->mon_id.my_id.my_proc); 111 } 112 res.res_stat = stat_fail; /* Assume fail until set otherwise */ 113 res.state = status_info.ourState; 114 115 /* 116 * Find existing host entry, or create one if not found. If 117 * find_host() fails, it will have logged the error already. 118 */ 119 if (getaddrinfo(arg->mon_id.mon_name, NULL, NULL, &ai) != 0) { 120 syslog(LOG_ERR, "Invalid hostname to sm_mon: %s", 121 arg->mon_id.mon_name); 122 return &res; 123 } 124 125 freeaddrinfo(ai); 126 127 if ((hp = find_host(arg->mon_id.mon_name, &h)) == NULL) 128 memset(hp = &h, 0, sizeof(h)); 129 130 lp = (MonList *)malloc(sizeof(MonList)); 131 if (!lp) 132 syslog(LOG_ERR, "Out of memory"); 133 else { 134 strncpy(lp->notifyHost, arg->mon_id.my_id.my_name, 135 SM_MAXSTRLEN); 136 lp->notifyProg = arg->mon_id.my_id.my_prog; 137 lp->notifyVers = arg->mon_id.my_id.my_vers; 138 lp->notifyProc = arg->mon_id.my_id.my_proc; 139 memcpy(lp->notifyData, arg->priv, 140 sizeof(lp->notifyData)); 141 142 lp->next = hp->monList; 143 hp->monList = lp; 144 change_host(arg->mon_id.mon_name, hp); 145 sync_file(); 146 res.res_stat = stat_succ; /* Report success */ 147 } 148 ALARM; 149 return (&res); 150 } 151 152 /* do_unmon ---------------------------------------------------------------- */ 153 /* 154 * Purpose: Remove a monitor request from a host 155 * Returns: TRUE if found, FALSE if not found. 156 * Notes: Common code from sm_unmon_1_svc and sm_unmon_all_1_svc 157 * In the unlikely event of more than one identical monitor 158 * request, all are removed. 159 */ 160 int 161 do_unmon(name, hp, ptr) 162 char *name; 163 HostInfo *hp; 164 void *ptr; 165 { 166 my_id *idp = ptr; 167 MonList *lp, *next; 168 MonList *last = NULL; 169 int result = FALSE; 170 171 lp = hp->monList; 172 while (lp) { 173 if (!strncasecmp(idp->my_name, lp->notifyHost, SM_MAXSTRLEN) 174 && (idp->my_prog == lp->notifyProg) 175 && (idp->my_proc == lp->notifyProc) 176 && (idp->my_vers == lp->notifyVers)) { 177 /* found one. Unhook from chain and free. */ 178 next = lp->next; 179 if (last) 180 last->next = next; 181 else 182 hp->monList = next; 183 free(lp); 184 lp = next; 185 result = TRUE; 186 } else { 187 last = lp; 188 lp = lp->next; 189 } 190 } 191 return (result); 192 } 193 194 /* sm_unmon_1 -------------------------------------------------------------- */ 195 /* 196 * Purpose: RPC procedure to release a monitor request. 197 * Returns: Local machine's status number 198 * Notes: The supplied mon_id should match the value passed in an 199 * earlier call to sm_mon_1 200 */ 201 struct sm_stat * 202 sm_unmon_1_svc(arg, req) 203 mon_id *arg; 204 struct svc_req *req; 205 { 206 static sm_stat res; 207 HostInfo *hp, h; 208 209 NO_ALARM; 210 if (debug) { 211 syslog(LOG_DEBUG, "un-monitor request for host %s", 212 arg->mon_name); 213 syslog(LOG_DEBUG, "recall host: %s prog: %d ver: %d proc: %d", 214 arg->my_id.my_name, arg->my_id.my_prog, 215 arg->my_id.my_vers, arg->my_id.my_proc); 216 } 217 if ((hp = find_host(arg->mon_name, &h)) != NULL) { 218 if (do_unmon(arg->mon_name, hp, &arg->my_id)) { 219 change_host(arg->mon_name, hp); 220 sync_file(); 221 } 222 else 223 syslog(LOG_ERR, 224 "unmon request from %s, no matching monitor", 225 arg->my_id.my_name); 226 } else 227 syslog(LOG_ERR, "unmon request from %s for unknown host %s", 228 arg->my_id.my_name, arg->mon_name); 229 230 res.state = status_info.ourState; 231 ALARM; 232 233 return (&res); 234 } 235 236 /* sm_unmon_all_1 ---------------------------------------------------------- */ 237 /* 238 * Purpose: RPC procedure to release monitor requests. 239 * Returns: Local machine's status number 240 * Notes: Releases all monitor requests (if any) from the specified 241 * host and program number. 242 */ 243 struct sm_stat * 244 sm_unmon_all_1_svc(arg, req) 245 my_id *arg; 246 struct svc_req *req; 247 { 248 static sm_stat res; 249 250 NO_ALARM; 251 if (debug) { 252 syslog(LOG_DEBUG, 253 "unmon_all for host: %s prog: %d ver: %d proc: %d", 254 arg->my_name, arg->my_prog, arg->my_vers, arg->my_proc); 255 } 256 257 unmon_hosts(); 258 sync_file(); 259 260 res.state = status_info.ourState; 261 ALARM; 262 263 return (&res); 264 } 265 266 /* sm_simu_crash_1 --------------------------------------------------------- */ 267 /* 268 * Purpose: RPC procedure to simulate a crash 269 * Returns: Nothing 270 * Notes: Standardised mechanism for debug purposes 271 * The specification says that we should drop all of our 272 * status information (apart from the list of monitored hosts 273 * on disc). However, this would confuse the rpc.lockd 274 * which would be unaware that all of its monitor requests 275 * had been silently junked. Hence we in fact retain all 276 * current requests and simply increment the status counter 277 * and inform all hosts on the monitor list. 278 */ 279 void * 280 sm_simu_crash_1_svc(v, req) 281 void *v; 282 struct svc_req *req; 283 { 284 static char dummy; 285 286 NO_ALARM; 287 if (debug) 288 syslog(LOG_DEBUG, "simu_crash called!!"); 289 290 reset_database(); 291 ALARM; 292 notify_handler(0); 293 294 return (&dummy); 295 } 296 297 /* sm_notify_1 ------------------------------------------------------------- */ 298 /* 299 * Purpose: RPC procedure notifying local statd of the crash of another 300 * Returns: Nothing 301 * Notes: There is danger of deadlock, since it is quite likely that 302 * the client procedure that we call will in turn call us 303 * to remove or adjust the monitor request. 304 * We therefore fork() a process to do the notifications. 305 * Note that the main HostInfo structure is in a mmap() 306 * region and so will be shared with the child, but the 307 * monList pointed to by the HostInfo is in normal memory. 308 * Hence if we read the monList before forking, we are 309 * protected from the parent servicing other requests 310 * that modify the list. 311 */ 312 void * 313 sm_notify_1_svc(arg, req) 314 stat_chge *arg; 315 struct svc_req *req; 316 { 317 struct timeval timeout = {20, 0}; /* 20 secs timeout */ 318 CLIENT *cli; 319 static char dummy; 320 status tx_arg; /* arg sent to callback procedure */ 321 MonList *lp; 322 HostInfo *hp, h; 323 pid_t pid; 324 325 if (debug) 326 syslog(LOG_DEBUG, "notify from host %s, new state %d", 327 arg->mon_name, arg->state); 328 329 hp = find_host(arg->mon_name, &h); 330 if (!hp) { 331 /* Never heard of this host - why is it notifying us? */ 332 syslog(LOG_DEBUG, "Unsolicited notification from host %s", 333 arg->mon_name); 334 return (&dummy); 335 } 336 lp = hp->monList; 337 if (!lp) /* We know this host, but have no outstanding requests. */ 338 return (&dummy); 339 340 pid = fork(); 341 if (pid == -1) { 342 syslog(LOG_ERR, "Unable to fork notify process - %s", 343 strerror(errno)); 344 return (FALSE); 345 } 346 if (pid) 347 return (&dummy); /* Parent returns */ 348 349 while (lp) { 350 tx_arg.mon_name = arg->mon_name; 351 tx_arg.state = arg->state; 352 memcpy(tx_arg.priv, lp->notifyData, sizeof(tx_arg.priv)); 353 cli = clnt_create(lp->notifyHost, lp->notifyProg, 354 lp->notifyVers, "udp"); 355 if (!cli) 356 syslog(LOG_ERR, "Failed to contact host %s%s", 357 lp->notifyHost, clnt_spcreateerror("")); 358 else { 359 if (clnt_call(cli, lp->notifyProc, xdr_status, &tx_arg, 360 xdr_void, &dummy, timeout) != RPC_SUCCESS) 361 syslog(LOG_ERR, 362 "Failed to call rpc.statd client at host %s", 363 lp->notifyHost); 364 clnt_destroy(cli); 365 } 366 lp = lp->next; 367 } 368 369 exit(0); /* Child quits */ 370 } 371
Indexes created Mon Sep 22 10:09:38 GMT 2025