about summary refs log tree commit diff
path: root/nis/nss_nis/nis-network.c
blob: 8d87c69d8e1757088dfeffa8cff3bef18e003613 (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
/* Copyright (C) 1996-2020 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1996.

   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
   <https://www.gnu.org/licenses/>.  */

#include <nss.h>
#include <netdb.h>
#include <ctype.h>
#include <errno.h>
#include <stdint.h>
#include <string.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <libc-lock.h>
#include <rpcsvc/yp.h>
#include <rpcsvc/ypclnt.h>

#include "nss-nis.h"

/* Get the declaration of the parser function.  */
#define ENTNAME netent
#define EXTERN_PARSER
#include <nss/nss_files/files-parse.c>

__libc_lock_define_initialized (static, lock)

static bool_t new_start = 1;
static char *oldkey;
static int oldkeylen;

enum nss_status
_nss_nis_setnetent (int stayopen)
{
  return _nss_nis_endnetent ();
}

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

  new_start = 1;
  if (oldkey != NULL)
    {
      free (oldkey);
      oldkey = NULL;
      oldkeylen = 0;
    }

  __libc_lock_unlock (lock);

  return NSS_STATUS_SUCCESS;
}
libnss_nis_hidden_def (_nss_nis_endnetent)

static enum nss_status
internal_nis_getnetent_r (struct netent *net, char *buffer, size_t buflen,
			  int *errnop, int *herrnop)
{
  struct parser_data *data = (void *) buffer;

  char *domain;
  if (__glibc_unlikely (yp_get_default_domain (&domain)))
    return NSS_STATUS_UNAVAIL;

  /* Get the next entry until we found a correct one. */
  int parse_res;
  do
    {
      char *result;
      char *outkey;
      int len;
      int keylen;
      int yperr;

      if (new_start)
        yperr = yp_first (domain, "networks.byname", &outkey, &keylen, &result,
			  &len);
      else
        yperr = yp_next (domain, "networks.byname", oldkey, oldkeylen, &outkey,
			 &keylen, &result, &len);

      if (__glibc_unlikely (yperr != YPERR_SUCCESS))
        {
	  enum nss_status retval = yperr2nss (yperr);

          if (retval == NSS_STATUS_TRYAGAIN)
	    {
	      *herrnop = NETDB_INTERNAL;
	      *errnop = errno;
	    }
          return retval;
        }

      if (__glibc_unlikely ((size_t) (len + 1) > buflen))
        {
          free (result);
	  *errnop = ERANGE;
	  *herrnop = NETDB_INTERNAL;
          return NSS_STATUS_TRYAGAIN;
        }

      char *p = strncpy (buffer, result, len);
      buffer[len] = '\0';
      while (isspace (*p))
        ++p;
      free (result);

      parse_res = _nss_files_parse_netent (p, net, data, buflen, errnop);
      if (__glibc_unlikely (parse_res == -1))
	{
	  free (outkey);
	  *herrnop = NETDB_INTERNAL;
	  *errnop = ERANGE;
	  return NSS_STATUS_TRYAGAIN;
	}

      free (oldkey);
      oldkey = outkey;
      oldkeylen = keylen;
      new_start = 0;
    }
  while (!parse_res);

  return NSS_STATUS_SUCCESS;
}

enum nss_status
_nss_nis_getnetent_r (struct netent *net, char *buffer, size_t buflen,
		      int *errnop, int *herrnop)
{
  enum nss_status status;

  __libc_lock_lock (lock);

  status = internal_nis_getnetent_r (net, buffer, buflen, errnop, herrnop);

  __libc_lock_unlock (lock);

  return status;
}

enum nss_status
_nss_nis_getnetbyname_r (const char *name, struct netent *net, char *buffer,
			 size_t buflen, int *errnop, int *herrnop)
{
  if (name == NULL)
    {
      *errnop = EINVAL;
      *herrnop = NETDB_INTERNAL;
      return NSS_STATUS_UNAVAIL;
    }

  char *domain;
  if (__glibc_unlikely (yp_get_default_domain (&domain)))
    return NSS_STATUS_UNAVAIL;

  struct parser_data *data = (void *) buffer;
  if (buflen < sizeof *data + 1)
    {
      *herrnop = NETDB_INTERNAL;
      *errnop = ERANGE;
      return NSS_STATUS_TRYAGAIN;
    }

  /* Convert name to lowercase.  */
  size_t namlen = strlen (name);
  /* Limit name length to the maximum size of an RPC packet.  */
  if (namlen > UDPMSGSIZE)
    {
      *errnop = ERANGE;
      return NSS_STATUS_UNAVAIL;
    }

  char name2[namlen + 1];
  size_t i;

  for (i = 0; i < namlen; ++i)
    name2[i] = _tolower (name[i]);
  name2[i] = '\0';

  char *result;
  int len;
  int yperr = yp_match (domain, "networks.byname", name2, namlen, &result,
			&len);

  if (__glibc_unlikely (yperr != YPERR_SUCCESS))
    {
      enum nss_status retval = yperr2nss (yperr);

      if (retval == NSS_STATUS_TRYAGAIN)
	{
	  *errnop = errno;
	  *herrnop = NETDB_INTERNAL;
	}
      return retval;
    }

  if (__glibc_unlikely ((size_t) (len + 1) > buflen))
    {
      free (result);
      *errnop = ERANGE;
      *herrnop = NETDB_INTERNAL;
      return NSS_STATUS_TRYAGAIN;
    }

  char *p = strncpy (buffer, result, len);
  buffer[len] = '\0';
  while (isspace (*p))
    ++p;
  free (result);

  int parse_res = _nss_files_parse_netent (p, net, data, buflen, errnop);

  if (__glibc_unlikely (parse_res < 1))
    {
      *herrnop = NETDB_INTERNAL;
      if (parse_res == -1)
	return NSS_STATUS_TRYAGAIN;
      else
	return NSS_STATUS_NOTFOUND;
    }
  else
    return NSS_STATUS_SUCCESS;
}

enum nss_status
_nss_nis_getnetbyaddr_r (uint32_t addr, int type, struct netent *net,
			 char *buffer, size_t buflen, int *errnop,
			 int *herrnop)
{
  char *domain;
  if (__glibc_unlikely (yp_get_default_domain (&domain)))
    return NSS_STATUS_UNAVAIL;

  struct in_addr in = { .s_addr = htonl (addr) };
  char *buf = inet_ntoa (in);
  size_t blen = strlen (buf);

  while (1)
    {
      char *result;
      int len;

      int yperr = yp_match (domain, "networks.byaddr", buf, blen, &result,
			    &len);

      if (__glibc_unlikely (yperr != YPERR_SUCCESS))
	  {
	    enum nss_status retval = yperr2nss (yperr);

	    if (retval == NSS_STATUS_NOTFOUND)
	      {
		if (buf[blen - 2] == '.' && buf[blen - 1] == '0')
		  {
		    /* Try again, but with trailing dot(s)
		       removed (one by one) */
		    buf[blen - 2] = '\0';
		    blen -= 2;
		    continue;
		  }
		else
		  return NSS_STATUS_NOTFOUND;
	      }
	    else
	      {
		if (retval == NSS_STATUS_TRYAGAIN)
		  *errnop = errno;
		return retval;
	      }
	  }

      if (__glibc_unlikely ((size_t) (len + 1) > buflen))
	{
	  free (result);
	  *errnop = ERANGE;
	  *herrnop = NETDB_INTERNAL;
	  return NSS_STATUS_TRYAGAIN;
	}

        char *p = strncpy (buffer, result, len);
	buffer[len] = '\0';
	while (isspace (*p))
	  ++p;
	free (result);

	int parse_res = _nss_files_parse_netent (p, net, (void *) buffer,
						 buflen, errnop);

	if (__glibc_unlikely (parse_res < 1))
	  {
	    *herrnop = NETDB_INTERNAL;
	    if (parse_res == -1)
	      return NSS_STATUS_TRYAGAIN;
	    else
	      return NSS_STATUS_NOTFOUND;
	  }
	else
	  return NSS_STATUS_SUCCESS;
    }
}