summaryrefslogtreecommitdiff
path: root/nis/nis_call.c
blob: 17f67abbde25b6470362b66d18f267084acee9d2 (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
/* Copyright (C) 1997 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 Library General Public License as
   published by the Free Software Foundation; either version 2 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <string.h>
#include <rpc/rpc.h>
#include <rpc/auth.h>
#include <rpcsvc/nis.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "nis_intern.h"

static struct timeval TIMEOUT = {25, 0};
static int const MAXTRIES = 3;

static unsigned long
inetstr2int (const char *str)
{
  char buffer[strlen (str) + 3];
  size_t buflen;
  size_t i, j;

  buflen = stpcpy (buffer, str) - buffer;

  j = 0;
  for (i = 0; i < buflen; ++i)
    if (buffer[i] == '.')
      {
	++j;
	if (j == 4)
	  {
	    buffer[i] = '\0';
	    break;
	  }
      }

  return inet_addr (buffer);
}

static CLIENT *
__nis_dobind (const nis_server *server, u_long flags)
{
  struct sockaddr_in clnt_saddr;
  int clnt_sock;
  size_t i;
  CLIENT *client = NULL;

  memset (&clnt_saddr, '\0', sizeof clnt_saddr);
  clnt_saddr.sin_family = AF_INET;
  for (i = 0; i < server->ep.ep_len; i++)
    {
      if (strcmp (server->ep.ep_val[i].family,"loopback") == 0)
	{
	  if (server->ep.ep_val[i].uaddr[i] == '-')
	    clnt_saddr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
	  else
	    if (strcmp (server->ep.ep_val[i].proto,"udp") == 0)
	      {
		if ((flags & USE_DGRAM) == USE_DGRAM)
		  clnt_saddr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
		else
		  continue;
	      }
	    else
	      if (strcmp (server->ep.ep_val[i].proto,"tcp") == 0)
		{
		  if ((flags & USE_DGRAM) == USE_DGRAM)
		    continue;
		  else
		    clnt_saddr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
		}
	}
      else
	if (strcmp (server->ep.ep_val[i].family,"inet") == 0)
	  {
	    if (server->ep.ep_val[i].uaddr[i] == '-')
	      clnt_saddr.sin_addr.s_addr =
		inetstr2int (server->ep.ep_val[i].uaddr);
	    else
	      if (strcmp (server->ep.ep_val[i].proto,"udp") == 0)
		{
		  if ((flags & USE_DGRAM) == USE_DGRAM)
		    clnt_saddr.sin_addr.s_addr =
		      inetstr2int (server->ep.ep_val[i].uaddr);
		  else
		    continue;
		}
	      else
		if (strcmp (server->ep.ep_val[i].proto,"tcp") == 0)
		  {
		    if ((flags & USE_DGRAM) == USE_DGRAM)
		      continue;
		    else
		      clnt_saddr.sin_addr.s_addr =
			inetstr2int (server->ep.ep_val[i].uaddr);
		  }
	  }
	else
	  continue;

      clnt_sock = RPC_ANYSOCK;
      if ((flags & USE_DGRAM) == USE_DGRAM)
	client = clntudp_create (&clnt_saddr, NIS_PROG, NIS_VERSION,
				 TIMEOUT, &clnt_sock);
      else
	client = clnttcp_create (&clnt_saddr, NIS_PROG, NIS_VERSION,
				 &clnt_sock, 0, 0);

      if (client == NULL)
	continue;
      if (clnt_call (client, 0, (xdrproc_t) xdr_void, NULL,
		     (xdrproc_t) xdr_void, NULL, TIMEOUT) != RPC_SUCCESS)
	{
	  clnt_destroy (client);
	  continue;
	}

      if ((flags & NO_AUTHINFO) != NO_AUTHINFO)
	{
#if defined(HAVE_SECURE_RPC)
	  if (server->key_type == NIS_PK_DH && getenv ("NO_SECURE_RPC") == NULL)
	    {
	      char netname[MAXNETNAMELEN+1];
	      char *p;

	      p = stpcpy (netname, "unix.");
	      strncpy (p, server->name,MAXNETNAMELEN-5);
	      netname[MAXNETNAMELEN] = '\0';
	      p = strchr (netname, '.');
	      *p = '@';
	      client->cl_auth =
		authdes_pk_create (netname, &server->pkey, 300, NULL, NULL);
	      if (!client->cl_auth)
		client->cl_auth = authunix_create_default ();
	    }
	  else
#endif
	    client->cl_auth = authunix_create_default ();
	}
      return client;
    }

  return NULL;
}

nis_error
__do_niscall2 (const nis_server *server, u_int server_len, u_long prog,
	       xdrproc_t xargs, caddr_t req, xdrproc_t xres, caddr_t resp,
	       u_long flags)
{
  CLIENT *clnt;
  int try, result;

  try = 0;
  result = NIS_NAMEUNREACHABLE;

  if (((flags & MASTER_ONLY) == MASTER_ONLY) && server_len > 1)
    server_len = 1; /* The first entry is the master */

  while (try < MAXTRIES && result != RPC_SUCCESS)
    {
      unsigned int i;

      if ((flags & HARD_LOOKUP) == 0)
	++try;

      for (i = 0; i < server_len; i++)
	{
	  if ((clnt = __nis_dobind (&server[i], flags)) == NULL)
	    continue;

	  result = clnt_call (clnt, prog, xargs, req, xres, resp, TIMEOUT);

	  if (result != RPC_SUCCESS)
	    {
	      clnt_perror (clnt, "do_niscall: clnt_call");
	      clnt_destroy (clnt);
	      result = NIS_RPCERROR;
	    }
	  else
	    clnt_destroy (clnt);
	}
    }

  return result;
}

static directory_obj *
dir_lookup (const_nis_name name, nis_server *serv, u_long flags)
{
  CLIENT *clnt;
  int try, result;
  nis_result *res;
  struct ns_request req;
  directory_obj *dir;

  res = calloc (1, sizeof (nis_result));
  req.ns_name = (char *)name;
  req.ns_object.ns_object_len = 0;
  req.ns_object.ns_object_val = NULL;
  try = 0;
  result = NIS_NAMEUNREACHABLE;

  while (try < MAXTRIES && result != RPC_SUCCESS)
    {
      if ((clnt = __nis_dobind (serv, flags)) == NULL)
	continue;

      result = clnt_call (clnt, NIS_LOOKUP, (xdrproc_t) xdr_ns_request,
			  (caddr_t) &req, (xdrproc_t) xdr_nis_result,
			  (caddr_t) res, TIMEOUT);

      if (result != RPC_SUCCESS)
	{
	  clnt_perror (clnt, "do_niscall: clnt_call");
	  clnt_destroy (clnt);
	  result = NIS_RPCERROR;
	}
      else
	clnt_destroy (clnt);
    }
  if (result != RPC_SUCCESS || res->status != NIS_SUCCESS)
    return NULL;

  dir = nis_clone_directory (&res->objects.objects_val->DI_data, NULL);
  nis_freeresult (res);

  return dir;
}

static directory_obj *
rec_dirsearch (const_nis_name name, directory_obj *dir, u_long flags)
{
  char domain [strlen (name) + 3];

  nis_domain_of_r (name, domain, sizeof (domain));
  if (strncmp (domain, "org_dir.", 8) == 0)
    {
      char tmp[strlen (name) + 3];

      nis_domain_of_r (domain, tmp, sizeof (tmp));
      strcpy (domain, tmp);
    }
  else
    if (strncmp (domain, "groups_dir.", 11) == 0)
      {
	char tmp[strlen (name) + 3];

	nis_domain_of_r (domain, tmp, sizeof (tmp));
	strcpy (domain, tmp);
      }
    else
      {
	/* We have no grous_dir or org_dir, so try the complete name */
	strcpy (domain, name);
      }

  switch (nis_dir_cmp (domain, dir->do_name))
    {
    case SAME_NAME:
      return dir;
    case NOT_SEQUENTIAL:
      /* NOT_SEQUENTIAL means, go one up and try it there ! */
    case HIGHER_NAME:
      { /* We need data from a parent domain */
	directory_obj *obj;
	char ndomain [strlen (name) + 3];

	nis_domain_of_r (dir->do_name, ndomain, sizeof (ndomain));

	/* The root server of our domain is a replica of the parent
	   domain ! (Now I understand why a root server must be a
	   replica of the parent domain) */
	obj = dir_lookup (ndomain, dir->do_servers.do_servers_val,
			  flags);
	if (obj != NULL)
	  {
	    /* We have found a NIS+ server serving ndomain, now
	       let us search for "name" */
	    nis_free_directory (dir);
	    return rec_dirsearch (name, obj, flags);
	  }
	else
	  {
	    /* Ups, very bad. Are we already the root server ? */
	    nis_free_directory (dir);
	    return NULL;
	  }
      }
      break;
    case LOWER_NAME:
      {
	directory_obj *obj;
	char leaf [strlen (name) + 3];
	char ndomain [strlen (name) + 3];
	u_int i;

	do
	  {
	    if (strlen (domain) == 0)
	      {
		nis_free_directory (dir);
		return NULL;
	      }
	    nis_leaf_of_r (domain, leaf, sizeof (leaf));
	    nis_domain_of_r (domain, ndomain, sizeof (ndomain));
	    strcpy (domain, ndomain);
	  }
	while (nis_dir_cmp (domain, dir->do_name) != SAME_NAME);
	strcat (leaf, ".");
	strcat (leaf, domain);

	for (i = 0; i < dir->do_servers.do_servers_len; ++i)
	  {
	    obj = dir_lookup (leaf, &dir->do_servers.do_servers_val[i],
			      flags);
	    if (obj != NULL)
	      {
		/* We have found a NIS+ server serving ndomain, now
		   let us search for "name" */
		nis_free_directory (dir);
		return rec_dirsearch (name, obj, flags);
	      }
	  }
      }
      break;
    case BAD_NAME:
      nis_free_directory (dir);
      return NULL;
    }
  nis_free_directory (dir);
  return NULL;
}

nis_error
__do_niscall (const_nis_name name, u_long prog, xdrproc_t xargs,
	      caddr_t req, xdrproc_t xres, caddr_t resp, u_long flags)
{
  nis_error result;
  directory_obj *dir = NULL;
  const nis_server *server;
  u_int server_len;


  dir = readColdStartFile ();
  if (dir == NULL) /* No /var/nis/NIS_COLD_START -> no NIS+ installed */
    return NIS_UNAVAIL;

  if (name != NULL)
    {
      dir = rec_dirsearch (name, dir, flags);
      if (dir == NULL)
	{
	  if (nis_dir_cmp (nis_local_directory(), name) == NOT_SEQUENTIAL)
	    return NIS_NAMEUNREACHABLE;
	  else
	    return NIS_NOTFOUND;
	}
    }
  server = dir->do_servers.do_servers_val;
  server_len = dir->do_servers.do_servers_len;

  if (((flags & MASTER_ONLY) == MASTER_ONLY) && server_len > 1)
    server_len = 1; /* The first entry is the master */

  result = __do_niscall2 (server, server_len, prog, xargs, req, xres,
			  resp, flags);
  if (dir != NULL)
    nis_free_directory (dir);

  return result;
}