summaryrefslogtreecommitdiff
path: root/nis/nis_callback.c
blob: b39786ac7032c1730a678218346c17f27c2d7440 (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
/* Copyright (C) 1997-2016 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Thorsten Kukuk <kukuk@suse.de>, 1997.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <libintl.h>
#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#include <string.h>
#include <memory.h>
#include <syslog.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <rpc/key_prot.h>
#include <rpcsvc/nis.h>
#include <rpcsvc/nis_callback.h>
#include <libc-lock.h>

#include "nis_xdr.h"
#include "nis_intern.h"

/* Sorry, we are not able to make this threadsafe. Stupid. But some
   functions doesn't send us a nis_result obj, so we don't have a
   cookie. Maybe we could use keys for threads ? Have to learn more
   about pthreads -- kukuk@vt.uni-paderborn.de */

static nis_cb *data;

__libc_lock_define_initialized (static, callback)


#if 0
static char *
__nis_getpkey(const char *sname)
{
  char buf[(strlen (sname) + 1) * 2 + 40];
  char pkey[HEXKEYBYTES + 1];
  char *cp, *domain;
  nis_result *res;
  unsigned int len = 0;

  domain = strchr (sname, '.');
  if (domain == NULL)
    return NULL;

  /* Remove prefixing dot */
  ++domain;

  cp = stpcpy (buf, "[cname=");
  cp = stpcpy (cp, sname);
  cp = stpcpy (cp, ",auth_type=DES],cred.org_dir.");
  cp = stpcpy (cp, domain);

  res = nis_list (buf, USE_DGRAM|NO_AUTHINFO|FOLLOW_LINKS|FOLLOW_PATH,
		  NULL, NULL);

  if (res == NULL)
    return NULL;

  if (NIS_RES_STATUS (res) != NIS_SUCCESS)
    {
      nis_freeresult (res);
      return NULL;
    }

  len = ENTRY_LEN(NIS_RES_OBJECT(res), 3);
  strncpy (pkey, ENTRY_VAL(NIS_RES_OBJECT(res), 3), len);
  pkey[len] = '\0';
  cp = strchr (pkey, ':');
  if (cp != NULL)
    *cp = '\0';

  nis_freeresult (res);

  return strdup (pkey);
}
#endif

static void
cb_prog_1 (struct svc_req *rqstp, SVCXPRT *transp)
{
  union
    {
      cback_data cbproc_receive_1_arg;
      nis_error cbproc_error_1_arg;
    }
  argument;
  char *result;
  xdrproc_t xdr_argument, xdr_result;
  bool_t bool_result;

  switch (rqstp->rq_proc)
    {
    case NULLPROC:
      svc_sendreply (transp, (xdrproc_t) xdr_void, (char *) NULL);
      return;

    case CBPROC_RECEIVE:
      {
	unsigned int i;

	xdr_argument = (xdrproc_t) xdr_cback_data;
	xdr_result = (xdrproc_t) xdr_bool;
	memset (&argument, 0, sizeof (argument));
	if (!svc_getargs (transp, xdr_argument, (caddr_t) & argument))
	  {
	    svcerr_decode (transp);
	    return;
	  }
	bool_result = FALSE;
	for (i = 0; i < argument.cbproc_receive_1_arg.entries.entries_len; ++i)
	  {
#define cbproc_entry(a) argument.cbproc_receive_1_arg.entries.entries_val[a]
	    char name[strlen (cbproc_entry(i)->zo_name) +
		      strlen (cbproc_entry(i)->zo_domain) + 3];
	    char *cp;

	    cp = stpcpy (name, cbproc_entry(i)->zo_name);
	    *cp++ = '.';
	    cp = stpcpy (cp, cbproc_entry(i)->zo_domain);

	    if ((data->callback) (name, cbproc_entry(i), data->userdata))
	      {
		bool_result = TRUE;
		data->nomore = 1;
		data->result = NIS_SUCCESS;
		break;
	      }
	  }
	result = (char *) &bool_result;
      }
      break;
    case CBPROC_FINISH:
      xdr_argument = (xdrproc_t) xdr_void;
      xdr_result = (xdrproc_t) xdr_void;
      memset (&argument, 0, sizeof (argument));
      if (!svc_getargs (transp, xdr_argument, (caddr_t) & argument))
	{
	  svcerr_decode (transp);
	  return;
	}
      data->nomore = 1;
      data->result = NIS_SUCCESS;
      bool_result = TRUE;	/* to make gcc happy, not necessary */
      result = (char *) &bool_result;
      break;
    case CBPROC_ERROR:
      xdr_argument = (xdrproc_t) _xdr_nis_error;
      xdr_result = (xdrproc_t) xdr_void;
      memset (&argument, 0, sizeof (argument));
      if (!svc_getargs (transp, xdr_argument, (caddr_t) & argument))
	{
	  svcerr_decode (transp);
	  return;
	}
      data->nomore = 1;
      data->result = argument.cbproc_error_1_arg;
      bool_result = TRUE;	/* to make gcc happy, not necessary */
      result = (char *) &bool_result;
      break;
    default:
      svcerr_noproc (transp);
      return;
    }
  if (result != NULL && !svc_sendreply (transp, xdr_result, result))
    svcerr_systemerr (transp);
  if (!svc_freeargs (transp, xdr_argument, (caddr_t) & argument))
    {
      fputs (_ ("unable to free arguments"), stderr);
      exit (1);
    }
  return;
}

static nis_error
internal_nis_do_callback (struct dir_binding *bptr, netobj *cookie,
			  struct nis_cb *cb)
{
  struct timeval TIMEOUT = {25, 0};
  bool_t cb_is_running;

  data = cb;

  for (;;)
    {
      struct pollfd my_pollfd[svc_max_pollfd];
      int i;

      if (svc_max_pollfd == 0 && svc_pollfd == NULL)
        return NIS_CBERROR;

      for (i = 0; i < svc_max_pollfd; ++i)
        {
          my_pollfd[i].fd = svc_pollfd[i].fd;
          my_pollfd[i].events = svc_pollfd[i].events;
          my_pollfd[i].revents = 0;
        }

      switch (i = TEMP_FAILURE_RETRY (__poll (my_pollfd, svc_max_pollfd,
					      25*1000)))
        {
	case -1:
	  return NIS_CBERROR;
	case 0:
	  /* See if callback 'thread' in the server is still alive. */
	  cb_is_running = FALSE;
	  if (clnt_call (bptr->clnt, NIS_CALLBACK, (xdrproc_t) xdr_netobj,
			 (caddr_t) cookie, (xdrproc_t) xdr_bool,
			 (caddr_t) &cb_is_running, TIMEOUT) != RPC_SUCCESS)
	    cb_is_running = FALSE;

	  if (cb_is_running == FALSE)
	    {
	      syslog (LOG_ERR, "NIS+: callback timed out");
	      return NIS_CBERROR;
	    }
	  break;
	default:
	  svc_getreq_poll (my_pollfd, i);
	  if (data->nomore)
	    return data->result;
	}
    }
}

nis_error
__nis_do_callback (struct dir_binding *bptr, netobj *cookie,
		   struct nis_cb *cb)
{
  nis_error result;

  __libc_lock_lock (callback);

  result = internal_nis_do_callback (bptr, cookie, cb);

  __libc_lock_unlock (callback);

  return result;
}

struct nis_cb *
__nis_create_callback (int (*callback) (const_nis_name, const nis_object *,
					const void *),
		       const void *userdata, unsigned int flags)
{
  struct nis_cb *cb;
  int sock = RPC_ANYSOCK;
  struct sockaddr_in sin;
  socklen_t len = sizeof (struct sockaddr_in);
  unsigned short port;
  int nomsg = 0;

  cb = (struct nis_cb *) calloc (1,
				 sizeof (struct nis_cb) + sizeof (nis_server));
  if (__glibc_unlikely (cb == NULL))
    goto failed;
  cb->serv = (nis_server *) (cb + 1);
  cb->serv->name = strdup (nis_local_principal ());
  if (__glibc_unlikely (cb->serv->name == NULL))
    goto failed;
  cb->serv->ep.ep_val = (endpoint *) calloc (2, sizeof (endpoint));
  if (__glibc_unlikely (cb->serv->ep.ep_val == NULL))
    goto failed;
  cb->serv->ep.ep_len = 1;
  cb->serv->ep.ep_val[0].family = strdup ("inet");
  if (__glibc_unlikely (cb->serv->ep.ep_val[0].family == NULL))
    goto failed;
  cb->callback = callback;
  cb->userdata = userdata;

  if ((flags & NO_AUTHINFO) || !key_secretkey_is_set ())
    {
      cb->serv->key_type = NIS_PK_NONE;
      cb->serv->pkey.n_bytes = NULL;
      cb->serv->pkey.n_len = 0;
    }
  else
    {
#if 0
      if ((cb->serv->pkey.n_bytes = __nis_getpkey (cb->serv->name)) == NULL)
	{
	  cb->serv->pkey.n_len = 0;
	  cb->serv->key_type = NIS_PK_NONE;
	}
      else
	{
	  cb->serv->key_type = NIS_PK_DH;
	  cb->serv->pkey.n_len = strlen(cb->serv->pkey.n_bytes);
	}
#else
      cb->serv->pkey.n_len =0;
      cb->serv->pkey.n_bytes = NULL;
      cb->serv->key_type = NIS_PK_NONE;
#endif
    }

  cb->serv->ep.ep_val[0].proto = strdup ((flags & USE_DGRAM) ? "udp" : "tcp");
  if (__glibc_unlikely (cb->serv->ep.ep_val[0].proto == NULL))
    goto failed;
  cb->xprt = ((flags & USE_DGRAM)
	      ? svcudp_bufcreate (sock, 100, 8192)
	      : svctcp_create (sock, 100, 8192));
  if (cb->xprt == NULL)
    {
      nomsg = 1;
      goto failed;
    }
  cb->sock = cb->xprt->xp_sock;
  if (!svc_register (cb->xprt, CB_PROG, CB_VERS, cb_prog_1, 0))
    {
      xprt_unregister (cb->xprt);
      svc_destroy (cb->xprt);
      xdr_free ((xdrproc_t) _xdr_nis_server, (char *) cb->serv);
      free (cb);
      syslog (LOG_ERR, "NIS+: failed to register callback dispatcher");
      return NULL;
    }

  if (getsockname (cb->sock, (struct sockaddr *) &sin, &len) == -1)
    {
      xprt_unregister (cb->xprt);
      svc_destroy (cb->xprt);
      xdr_free ((xdrproc_t) _xdr_nis_server, (char *) cb->serv);
      free (cb);
      syslog (LOG_ERR, "NIS+: failed to read local socket info");
      return NULL;
    }
  port = ntohs (sin.sin_port);
  get_myaddress (&sin);

  if (asprintf (&cb->serv->ep.ep_val[0].uaddr, "%s.%d.%d",
		inet_ntoa (sin.sin_addr), (port & 0xFF00) >> 8, port & 0x00FF)
      < 0)
    goto failed;

  return cb;

 failed:
  if (cb)
    {
      if (cb->xprt)
	svc_destroy (cb->xprt);
      xdr_free ((xdrproc_t) _xdr_nis_server, (char *) cb->serv);
      free (cb);
    }
  if (!nomsg)
    syslog (LOG_ERR, "NIS+: out of memory allocating callback");
  return NULL;
}

nis_error
__nis_destroy_callback (struct nis_cb *cb)
{
  xprt_unregister (cb->xprt);
  svc_destroy (cb->xprt);
  close (cb->sock);
  xdr_free ((xdrproc_t) _xdr_nis_server, (char *) cb->serv);
  free (cb);

  return NIS_SUCCESS;
}