summaryrefslogtreecommitdiffstats
path: root/usr.sbin/rpc.statd/procs.c
blob: eed78495915275dd03f0f7ff1ce0508885e029b5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
/*
 * 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.
 *
 */

#ifndef lint
static const char rcsid[] =
  "$FreeBSD$";
#endif /* not lint */

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <rpc/rpc.h>
#include <syslog.h>
#include <vis.h>
#include <netdb.h>	/* for getaddrinfo()		*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include "statd.h"

/* sm_check_hostname -------------------------------------------------------- */
/*
 * Purpose: Check `mon_name' member of sm_name struct to ensure that the array
 * consists only of printable characters.
 *
 * Returns: TRUE if hostname is good. FALSE if hostname contains binary or
 * otherwise non-printable characters.
 *
 * Notes: Will syslog(3) to warn of corrupt hostname.
 */

int sm_check_hostname(struct svc_req *req, char *arg)
{
  int len, dstlen, ret;
  struct sockaddr_in *claddr;
  char *dst;

  len = strlen(arg);
  dstlen = (4 * len) + 1;
  dst = malloc(dstlen);
  claddr = svc_getcaller(req->rq_xprt);
  ret = 1;

  if (claddr == NULL || dst == NULL)
  {
    ret = 0;
  }
  else if (strvis(dst, arg, VIS_WHITE) != len)
  {
    syslog(LOG_ERR,
	"sm_stat: client %s hostname %s contained invalid characters.",
	inet_ntoa(claddr->sin_addr),
	dst);
    ret = 0;
  }
  free(dst);
  return (ret);
}

/*  sm_stat_1 --------------------------------------------------------------- */
/*
   Purpose:	RPC call to enquire if a host can be monitored
   Returns:	TRUE for any hostname that can be looked up to give
		an address.
*/

struct sm_stat_res *sm_stat_1_svc(sm_name *arg, struct svc_req *req)
{
  static sm_stat_res res;
  struct addrinfo *ai;
  struct sockaddr_in *claddr;
  static int err;

  err = 1;
  if ((err = sm_check_hostname(req, arg->mon_name)) == 0)
  {
    res.res_stat = stat_fail;
  }
  if (err != 0)
  {
    if (debug)
	    syslog(LOG_DEBUG, "stat called for host %s", arg->mon_name);
    if (getaddrinfo(arg->mon_name, NULL, NULL, &ai) == 0) {
	    res.res_stat = stat_succ;
	    freeaddrinfo(ai);
    }
    else
    {
      claddr = svc_getcaller(req->rq_xprt);
      syslog(LOG_ERR, "invalid hostname to sm_stat from %s: %s",
	  inet_ntoa(claddr->sin_addr), arg->mon_name);
      res.res_stat = stat_fail;
    }
  }
  res.state = status_info->ourState;
  return (&res);
}

/* sm_mon_1 ---------------------------------------------------------------- */
/*
   Purpose:	RPC procedure to establish a monitor request
   Returns:	Success, unless lack of resources prevents
		the necessary structures from being set up
		to record the request, or if the hostname is not
		valid (as judged by getaddrinfo())
*/

struct sm_stat_res *sm_mon_1_svc(mon *arg, struct svc_req *req)
{
  static sm_stat_res res;
  HostInfo *hp;
  static int err;
  MonList *lp;
  struct addrinfo *ai;

  if ((err = sm_check_hostname(req, arg->mon_id.mon_name)) == 0)
  {
    res.res_stat = stat_fail;
  }

  if (err != 0)
  {
    if (debug)
    {
      syslog(LOG_DEBUG, "monitor request for host %s", arg->mon_id.mon_name);
      syslog(LOG_DEBUG, "recall host: %s prog: %d ver: %d proc: %d",
      arg->mon_id.mon_name,
      arg->mon_id.my_id.my_prog, arg->mon_id.my_id.my_vers,
      arg->mon_id.my_id.my_proc);
    }
    res.res_stat = stat_fail;  /* Assume fail until set otherwise      */
    res.state = status_info->ourState;
  
    /* Find existing host entry, or create one if not found            */
    /* If find_host() fails, it will have logged the error already.    */
    if (getaddrinfo(arg->mon_id.mon_name, NULL, NULL, &ai) != 0)
    {
      syslog(LOG_ERR, "Invalid hostname to sm_mon: %s", arg->mon_id.mon_name);
      return (&res);
    }
    freeaddrinfo(ai);
    if ((hp = find_host(arg->mon_id.mon_name, TRUE)))
    {
      lp = (MonList *)malloc(sizeof(MonList));
      if (!lp)
      {
        syslog(LOG_ERR, "Out of memory");
      }
      else
      {
        strncpy(lp->notifyHost, arg->mon_id.my_id.my_name, SM_MAXSTRLEN);
        lp->notifyProg = arg->mon_id.my_id.my_prog;
        lp->notifyVers = arg->mon_id.my_id.my_vers;
        lp->notifyProc = arg->mon_id.my_id.my_proc;
        memcpy(lp->notifyData, arg->priv, sizeof(lp->notifyData));

        lp->next = hp->monList;
        hp->monList = lp;
        sync_file();

        res.res_stat = stat_succ;      /* Report success                       */
      }
    }
  }
  return (&res);
}

/* do_unmon ---------------------------------------------------------------- */
/*
   Purpose:	Remove a monitor request from a host
   Returns:	TRUE if found, FALSE if not found.
   Notes:	Common code from sm_unmon_1_svc and sm_unmon_all_1_svc
		In the unlikely event of more than one identical monitor
		request, all are removed.
*/

static int do_unmon(HostInfo *hp, my_id *idp)
{
  MonList *lp, *next;
  MonList *last = NULL;
  int result = FALSE;

  lp = hp->monList;
  while (lp)
  {
    if (!strncasecmp(idp->my_name, lp->notifyHost, SM_MAXSTRLEN)
      && (idp->my_prog == lp->notifyProg) && (idp->my_proc == lp->notifyProc)
      && (idp->my_vers == lp->notifyVers))
    {
      /* found one.  Unhook from chain and free.		*/
      next = lp->next;
      if (last) last->next = next;
      else hp->monList = next;
      free(lp);
      lp = next;
      result = TRUE;
    }
    else
    {
      last = lp;
      lp = lp->next;
    }
  }
  return (result);
}

/* sm_unmon_1 -------------------------------------------------------------- */
/*
   Purpose:	RPC procedure to release a monitor request.
   Returns:	Local machine's status number
   Notes:	The supplied mon_id should match the value passed in an
		earlier call to sm_mon_1
*/

struct sm_stat *sm_unmon_1_svc(mon_id *arg, struct svc_req *req __unused)
{
  static sm_stat res;
  HostInfo *hp;

  if (debug)
  {
    syslog(LOG_DEBUG, "un-monitor request for host %s", arg->mon_name);
    syslog(LOG_DEBUG, "recall host: %s prog: %d ver: %d proc: %d",
      arg->mon_name,
      arg->my_id.my_prog, arg->my_id.my_vers, arg->my_id.my_proc);
  }

  if ((hp = find_host(arg->mon_name, FALSE)))
  {
    if (do_unmon(hp, &arg->my_id)) sync_file();
    else
    {
      syslog(LOG_ERR, "unmon request from %s, no matching monitor",
	arg->my_id.my_name);
    }
  }
  else syslog(LOG_ERR, "unmon request from %s for unknown host %s",
    arg->my_id.my_name, arg->mon_name);

  res.state = status_info->ourState;

  return (&res);
}

/* sm_unmon_all_1 ---------------------------------------------------------- */
/*
   Purpose:	RPC procedure to release monitor requests.
   Returns:	Local machine's status number
   Notes:	Releases all monitor requests (if any) from the specified
		host and program number.
*/

struct sm_stat *sm_unmon_all_1_svc(my_id *arg, struct svc_req *req __unused)
{
  static sm_stat res;
  HostInfo *hp;
  int i;

  if (debug)
  {
    syslog(LOG_DEBUG, "unmon_all for host: %s prog: %d ver: %d proc: %d",
      arg->my_name, arg->my_prog, arg->my_vers, arg->my_proc);
  }

  for (i = status_info->noOfHosts, hp = status_info->hosts; i; i--, hp++)
  {
    do_unmon(hp, arg);
  }
  sync_file();

  res.state = status_info->ourState;

  return (&res);
}

/* sm_simu_crash_1 --------------------------------------------------------- */
/*
   Purpose:	RPC procedure to simulate a crash
   Returns:	Nothing
   Notes:	Standardised mechanism for debug purposes
		The specification says that we should drop all of our
		status information (apart from the list of monitored hosts
		on disc).  However, this would confuse the rpc.lockd
		which would be unaware that all of its monitor requests
		had been silently junked.  Hence we in fact retain all
		current requests and simply increment the status counter
		and inform all hosts on the monitor list.
*/

void *sm_simu_crash_1_svc(void *v __unused, struct svc_req *req __unused)
{
  static char dummy;
  int work_to_do;
  HostInfo *hp;
  int i;

  if (debug) syslog(LOG_DEBUG, "simu_crash called!!");

  /* Simulate crash by setting notify-required flag on all monitored	*/
  /* hosts, and incrementing our status number.  notify_hosts() is	*/
  /* then called to fork a process to do the notifications.		*/

  for (i = status_info->noOfHosts, hp = status_info->hosts; i ; i--, hp++)
  {
    if (hp->monList)
    {
      work_to_do = TRUE;
      hp->notifyReqd = TRUE;
    }
  }
  status_info->ourState += 2;	/* always even numbers if not crashed	*/

  if (work_to_do) notify_hosts();

  return (&dummy);
}

/* sm_notify_1 ------------------------------------------------------------- */
/*
   Purpose:	RPC procedure notifying local statd of the crash of another
   Returns:	Nothing
   Notes:	There is danger of deadlock, since it is quite likely that
		the client procedure that we call will in turn call us
		to remove or adjust the monitor request.
		We therefore fork() a process to do the notifications.
		Note that the main HostInfo structure is in a mmap()
		region and so will be shared with the child, but the
		monList pointed to by the HostInfo is in normal memory.
		Hence if we read the monList before forking, we are
		protected from the parent servicing other requests
		that modify the list.
*/

void *sm_notify_1_svc(stat_chge *arg, struct svc_req *req __unused)
{
  struct timeval timeout = { 20, 0 };	/* 20 secs timeout		*/
  CLIENT *cli;
  static char dummy; 
  sm_status tx_arg;		/* arg sent to callback procedure	*/
  MonList *lp;
  HostInfo *hp;
  pid_t pid;

  if (debug) syslog(LOG_DEBUG, "notify from host %s, new state %d",
    arg->mon_name, arg->state);

  hp = find_host(arg->mon_name, FALSE);
  if (!hp)
  {
    /* Never heard of this host - why is it notifying us?		*/
    syslog(LOG_ERR, "Unsolicited notification from host %s", arg->mon_name);
    return (&dummy);
  }
  lp = hp->monList;
  if (!lp) return (&dummy);	/* We know this host, but have no	*/
				/* outstanding requests.		*/
  pid = fork();
  if (pid == -1)
  {
    syslog(LOG_ERR, "Unable to fork notify process - %s", strerror(errno));
    return (NULL);		/* no answer, the client will retry */
  }
  if (pid) return (&dummy);	/* Parent returns			*/

  while (lp)
  {
    tx_arg.mon_name = arg->mon_name;
    tx_arg.state = arg->state;
    memcpy(tx_arg.priv, lp->notifyData, sizeof(tx_arg.priv));
    cli = clnt_create(lp->notifyHost, lp->notifyProg, lp->notifyVers, "udp");
    if (!cli)
    {
      syslog(LOG_ERR, "Failed to contact host %s%s", lp->notifyHost,
        clnt_spcreateerror(""));
    }
    else
    {
      if (clnt_call(cli, lp->notifyProc, (xdrproc_t)xdr_sm_status, &tx_arg,
	  (xdrproc_t)xdr_void, &dummy, timeout) != RPC_SUCCESS)
      {
        syslog(LOG_ERR, "Failed to call rpc.statd client at host %s",
	  lp->notifyHost);
      }
      clnt_destroy(cli);
    }
    lp = lp->next;
  }

  exit (0);	/* Child quits	*/
}
OpenPOWER on IntegriCloud