summary refs log tree commit diff
path: root/nis/nss_nisplus/nisplus-rpc.c
blob: 3273cf858af959f78df7668f6c8372c2f170f90c (plain) (blame)
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
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
/* Copyright (C) 1997-2015 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.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 <atomic.h>
#include <ctype.h>
#include <errno.h>
#include <nss.h>
#include <string.h>
#include <rpc/netdb.h>
#include <rpcsvc/nis.h>
#include <bits/libc-lock.h>

#include "nss-nisplus.h"

__libc_lock_define_initialized (static, lock)

static nis_result *result;
static nis_name tablename_val;
static u_long tablename_len;

#define NISENTRYVAL(idx, col, res) \
        (NIS_RES_OBJECT (res)[idx].EN_data.en_cols.en_cols_val[col].ec_value.ec_value_val)

#define NISENTRYLEN(idx, col, res) \
        (NIS_RES_OBJECT (res)[idx].EN_data.en_cols.en_cols_val[col].ec_value.ec_value_len)


static int
_nss_nisplus_parse_rpcent (nis_result *result, struct rpcent *rpc,
			   char *buffer, size_t buflen, int *errnop)
{
  char *first_unused = buffer;
  size_t room_left = buflen;
  unsigned int i;
  char *line;


  if (result == NULL)
    return 0;

  if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS)
      || __type_of (NIS_RES_OBJECT (result)) != NIS_ENTRY_OBJ
      || strcmp (NIS_RES_OBJECT (result)[0].EN_data.en_type, "rpc_tbl") != 0
      || NIS_RES_OBJECT (result)[0].EN_data.en_cols.en_cols_len < 3)
    return 0;

  if (NISENTRYLEN (0, 0, result) >= room_left)
    {
    no_more_room:
      *errnop = ERANGE;
      return -1;
    }
  strncpy (first_unused, NISENTRYVAL (0, 0, result),
           NISENTRYLEN (0, 0, result));
  first_unused[NISENTRYLEN (0, 0, result)] = '\0';
  rpc->r_name = first_unused;
  size_t len = strlen (first_unused) + 1;
  room_left -= len;
  first_unused += len;

  rpc->r_number = atoi (NISENTRYVAL (0, 2, result));

  /* XXX Rewrite at some point to allocate the array first and then
     copy the strings.  It wasteful to first concatenate the strings
     to just split them again later.  */
  line = first_unused;
  for (i = 0; i < NIS_RES_NUMOBJ (result); ++i)
    {
      if (strcmp (NISENTRYVAL (i, 1, result), rpc->r_name) != 0)
        {
          if (NISENTRYLEN (i, 1, result) + 2 > room_left)
	    goto no_more_room;
	  *first_unused++ = ' ';
          first_unused = __stpncpy (first_unused, NISENTRYVAL (i, 1, result),
				    NISENTRYLEN (i, 1, result));
          room_left -= NISENTRYLEN (i, 1, result) + 1;
        }
    }
  *first_unused++ = '\0';

  /* Adjust the pointer so it is aligned for
     storing pointers.  */
  size_t adjust = ((__alignof__ (char *)
		    - (first_unused - (char *) 0) % __alignof__ (char *))
		   % __alignof__ (char *));
  if (room_left < adjust + sizeof (char *))
    goto no_more_room;
  first_unused += adjust;
  room_left -= adjust;
  rpc->r_aliases = (char **) first_unused;

  /* For the terminating NULL pointer.  */
  room_left -= sizeof (char *);

  i = 0;
  while (*line != '\0')
    {
      /* Skip leading blanks.  */
      while (isspace (*line))
        ++line;

      if (*line == '\0')
        break;

      if (room_left < sizeof (char *))
	goto no_more_room;

      room_left -= sizeof (char *);
      rpc->r_aliases[i++] = line;

      while (*line != '\0' && *line != ' ')
        ++line;

      if (*line == ' ')
	*line++ = '\0';
    }
  rpc->r_aliases[i] = NULL;

  return 1;
}


static enum nss_status
_nss_create_tablename (int *errnop)
{
  if (tablename_val == NULL)
    {
      const char *local_dir = nis_local_directory ();
      size_t local_dir_len = strlen (local_dir);
      static const char prefix[] = "rpc.org_dir.";

      char *p = malloc (sizeof (prefix) + local_dir_len);
      if (p == NULL)
	{
	  *errnop = errno;
	  return NSS_STATUS_TRYAGAIN;
	}

      memcpy (__stpcpy (p, prefix), local_dir, local_dir_len + 1);

      tablename_len = sizeof (prefix) - 1 + local_dir_len;

      atomic_write_barrier ();

      tablename_val = p;
    }

  return NSS_STATUS_SUCCESS;
}


enum nss_status
_nss_nisplus_setrpcent (int stayopen)
{
  enum nss_status status = NSS_STATUS_SUCCESS;

  __libc_lock_lock (lock);

  if (result != NULL)
    {
      nis_freeresult (result);
      result = NULL;
    }

  if (tablename_val == NULL)
    {
      int err;
      status = _nss_create_tablename (&err);
    }

  __libc_lock_unlock (lock);

  return status;
}

enum nss_status
_nss_nisplus_endrpcent (void)
{
  __libc_lock_lock (lock);

  if (result != NULL)
    {
      nis_freeresult (result);
      result = NULL;
    }

  __libc_lock_unlock (lock);

  return NSS_STATUS_SUCCESS;
}

static enum nss_status
internal_nisplus_getrpcent_r (struct rpcent *rpc, char *buffer,
			      size_t buflen, int *errnop)
{
  int parse_res;

  /* Get the next entry until we found a correct one. */
  do
    {
      nis_result *saved_res;

      if (result == NULL)
	{
	  saved_res = NULL;
          if (tablename_val == NULL)
	    {
	      enum nss_status status =  _nss_create_tablename (errnop);

	      if (status != NSS_STATUS_SUCCESS)
		return status;
	    }

	  result = nis_first_entry (tablename_val);
	  if (result == NULL)
	    {
	      *errnop = errno;
	      return NSS_STATUS_TRYAGAIN;
	    }
	  if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
	    return niserr2nss (result->status);
	}
      else
	{
	  saved_res = result;
	  result = nis_next_entry (tablename_val, &result->cookie);
	  if (result == NULL)
	    {
	      *errnop = errno;
	      return NSS_STATUS_TRYAGAIN;
	    }
	  if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
	    {
	      nis_freeresult (saved_res);
	      return niserr2nss (result->status);
	    }
	}

      parse_res = _nss_nisplus_parse_rpcent (result, rpc, buffer,
					     buflen, errnop);
      if (parse_res == -1)
	{
	  nis_freeresult (result);
	  result = saved_res;
	  *errnop = ERANGE;
	  return NSS_STATUS_TRYAGAIN;
	}
      else
	{
	  if (saved_res)
	    nis_freeresult (saved_res);
	}
    }
  while (!parse_res);

  return NSS_STATUS_SUCCESS;
}

enum nss_status
_nss_nisplus_getrpcent_r (struct rpcent *result, char *buffer,
			  size_t buflen, int *errnop)
{
  int status;

  __libc_lock_lock (lock);

  status = internal_nisplus_getrpcent_r (result, buffer, buflen, errnop);

  __libc_lock_unlock (lock);

  return status;
}

enum nss_status
_nss_nisplus_getrpcbyname_r (const char *name, struct rpcent *rpc,
			     char *buffer, size_t buflen, int *errnop)
{
  int parse_res;

  if (tablename_val == NULL)
    {
      __libc_lock_lock (lock);

      enum nss_status status = _nss_create_tablename (errnop);

      __libc_lock_unlock (lock);

      if (status != NSS_STATUS_SUCCESS)
	return status;
    }

  if (name == NULL)
    return NSS_STATUS_NOTFOUND;

  char buf[strlen (name) + 10 + tablename_len];
  int olderr = errno;

  /* Search at first in the alias list, and use the correct name
     for the next search */
  snprintf (buf, sizeof (buf), "[name=%s],%s", name, tablename_val);
  nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS | USE_DGRAM,
				 NULL, NULL);

  if (result != NULL)
    {
      char *bufptr = buf;

      /* If we did not find it, try it as original name. But if the
	 database is correct, we should find it in the first case, too */
      if ((result->status != NIS_SUCCESS
	   && result->status != NIS_S_SUCCESS)
	  || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
	  || strcmp (result->objects.objects_val->EN_data.en_type,
		     "rpc_tbl") != 0
	  || result->objects.objects_val->EN_data.en_cols.en_cols_len < 3)
	snprintf (buf, sizeof (buf), "[cname=%s],%s", name, tablename_val);
      else
	{
	  /* We need to allocate a new buffer since there is no
	     guarantee the returned name has a length limit.  */
	  const char *entryval = NISENTRYVAL (0, 0, result);
	  size_t buflen = strlen (entryval) + 10 + tablename_len;
	  bufptr = alloca (buflen);
	  snprintf (bufptr, buflen, "[cname=%s],%s",
		    entryval, tablename_val);
	}

      nis_freeresult (result);
      result = nis_list (bufptr, FOLLOW_PATH | FOLLOW_LINKS | USE_DGRAM,
			 NULL, NULL);
    }

  if (result == NULL)
    {
      *errnop = ENOMEM;
      return NSS_STATUS_TRYAGAIN;
    }

  if (__glibc_unlikely (niserr2nss (result->status) != NSS_STATUS_SUCCESS))
    {
      enum nss_status status = niserr2nss (result->status);

      __set_errno (olderr);

      nis_freeresult (result);
      return status;
    }

  parse_res = _nss_nisplus_parse_rpcent (result, rpc, buffer, buflen,
					     errnop);

  nis_freeresult (result);

  if (parse_res < 1)
    {
      if (parse_res == -1)
	{
	  *errnop = ERANGE;
	  return NSS_STATUS_TRYAGAIN;
	}

      __set_errno (olderr);
      return NSS_STATUS_NOTFOUND;
    }

  return NSS_STATUS_SUCCESS;
}

enum nss_status
_nss_nisplus_getrpcbynumber_r (const int number, struct rpcent *rpc,
			       char *buffer, size_t buflen, int *errnop)
{
  if (tablename_val == NULL)
    {
      __libc_lock_lock (lock);

      enum nss_status status = _nss_create_tablename (errnop);

      __libc_lock_unlock (lock);

      if (status != NSS_STATUS_SUCCESS)
	return status;
    }

  char buf[12 + 3 * sizeof (number) + tablename_len];
  int olderr = errno;

  snprintf (buf, sizeof (buf), "[number=%d],%s", number, tablename_val);

  nis_result *result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH | USE_DGRAM,
				 NULL, NULL);

  if (result == NULL)
    {
      *errnop = ENOMEM;
      return NSS_STATUS_TRYAGAIN;
    }

  if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS,  0))
    {
      enum nss_status status = niserr2nss (result->status);

      __set_errno (olderr);

      nis_freeresult (result);
      return status;
    }

  int parse_res = _nss_nisplus_parse_rpcent (result, rpc, buffer, buflen,
					     errnop);

  nis_freeresult (result);

  if (parse_res < 1)
    {
      if (parse_res == -1)
	{
	  *errnop = ERANGE;
	  return NSS_STATUS_TRYAGAIN;
	}
      else
	{
	  __set_errno (olderr);
	  return NSS_STATUS_NOTFOUND;
	}
    }

  return NSS_STATUS_SUCCESS;
}