summaryrefslogtreecommitdiff
path: root/nis/nss_nisplus/nisplus-hosts.c
blob: 0a486411debd4e5bcd55bdec246c8edbddf98a31 (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
/* 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 <nss.h>
#include <netdb.h>
#include <errno.h>
#include <ctype.h>
#include <string.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <libc-lock.h>
#include <rpcsvc/nis.h>
#include <rpcsvc/nislib.h>

#include "nss-nisplus.h"

__libc_lock_define_initialized (static, lock)

static nis_result *result = NULL;
static nis_name *names = NULL;

#define NISENTRYVAL(idx,col,res) \
        ((res)->objects.objects_val[(idx)].zo_data.objdata_u.en_data.en_cols.en_cols_val[(col)].ec_value.ec_value_val)

#define NISENTRYLEN(idx,col,res) \
        ((res)->objects.objects_val[(idx)].zo_data.objdata_u.en_data.en_cols.en_cols_val[(col)].ec_value.ec_value_len)

/* Get implementation for some internal functions. */
#include "../../resolv/mapv4v6addr.h"
#include "../../resolv/mapv4v6hostent.h"

#define ENTNAME         hostent
#define DATABASE        "hosts"
#define NEED_H_ERRNO

#define ENTDATA hostent_data
struct hostent_data
  {
    unsigned char host_addr[16];        /* IPv4 or IPv6 address.  */
    char *h_addr_ptrs[2];       /* Points to that and null terminator.  */
  };

#define TRAILING_LIST_MEMBER            h_aliases
#define TRAILING_LIST_SEPARATOR_P       isspace
#include "../../nss/nss_files/files-parse.c"
LINE_PARSER
("#",
 {
   char *addr;

   STRING_FIELD (addr, isspace, 1);

   /* Parse address.  */
   if ((_res.options & RES_USE_INET6)
       && inet_pton (AF_INET6, addr, entdata->host_addr) > 0)
     {
       result->h_addrtype = AF_INET6;
       result->h_length = IN6ADDRSZ;
     }
   else
     if (inet_pton (AF_INET, addr, entdata->host_addr) > 0)
       {
         if (_res.options & RES_USE_INET6)
           {
             map_v4v6_address ((char *) entdata->host_addr,
                               (char *) entdata->host_addr);
             result->h_addrtype = AF_INET6;
             result->h_length = IN6ADDRSZ;
           }
         else
           {
             result->h_addrtype = AF_INET;
             result->h_length = INADDRSZ;
           }
       }
     else
       /* Illegal address: ignore line.  */
       return 0;

   /* Store a pointer to the address in the expected form.  */
   entdata->h_addr_ptrs[0] = entdata->host_addr;
   entdata->h_addr_ptrs[1] = NULL;
   result->h_addr_list = entdata->h_addr_ptrs;

   /* If we need the host entry in IPv6 form change it now.  */
   if (_res.options & RES_USE_INET6)
     {
        char *bufptr = data->linebuffer;
       size_t buflen = (char *) data + datalen - bufptr;
       map_v4v6_hostent (result, &bufptr, &buflen);
     }

   STRING_FIELD (result->h_name, isspace, 1);
 }
)


static int
_nss_nisplus_parse_hostent (nis_result *result, struct hostent *host,
			    char *buffer, size_t buflen)
{
  char *p = buffer;
  size_t room_left = buflen;
  int parse_res, i;
  struct parser_data *data = (void *) buffer;

  if (result == NULL)
    return -1;

  if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS) ||
      result->objects.objects_val[0].zo_data.zo_type != ENTRY_OBJ ||
      strcmp(result->objects.objects_val[0].zo_data.objdata_u.en_data.en_type,
             "hosts_tbl") != 0 ||
      result->objects.objects_val[0].zo_data.objdata_u.en_data.en_cols.en_cols_len < 4)
    return -1;

  memset (p, '\0', room_left);

  /* Generate the hosts entry format and use the normal parser */
  if (NISENTRYLEN (0, 2, result) + 1 > room_left)
    {
      __set_errno (ERANGE);
      return -1;
    }
  strncpy (p, NISENTRYVAL (0, 2, result),
	   NISENTRYLEN (0, 2, result));
  room_left -= (NISENTRYLEN (0, 2, result) + 1);

  if (NISENTRYLEN (0, 0, result) + 1 > room_left)
    {
      __set_errno (ERANGE);
      return -1;
    }
  strcat (p, "\t");
  strncat (p, NISENTRYVAL (0, 0, result), NISENTRYLEN (0, 0, result));
  room_left -= (NISENTRYLEN (0, 0, result) + 1);
                                       /* + 1: We overwrite the last \0 */

  for (i = 1; i < result->objects.objects_len; i++)
    {
      if (NISENTRYLEN (i, 1, result) + 1 > room_left)
	{
	  __set_errno (ERANGE);
	  return -1;
	}
      strcat (p, " ");
      strcat (p, NISENTRYVAL (i, 1, result));
      room_left -= (NISENTRYLEN (i, 1, result) + 1);
    }

  parse_res = parse_line (p, host, data, buflen);

  return parse_res;
}

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

  if (result)
    nis_freeresult (result);
  result = NULL;
  if (names)
    {
      nis_freenames (names);
      names = NULL;
    }

  __libc_lock_unlock (lock);

  return NSS_STATUS_SUCCESS;
}

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

  if (result)
    nis_freeresult (result);
  result = NULL;
  if (names)
    {
      nis_freenames (names);
      names = NULL;
    }

  __libc_lock_unlock (lock);

  return NSS_STATUS_SUCCESS;
}

static enum nss_status
internal_nisplus_gethostent_r (struct hostent *host, char *buffer,
			       size_t buflen, int *herrnop)
{
  int parse_res;

  /* Get the next entry until we found a correct one. */
  do
    {
      if (result == NULL)
	{
	  names = nis_getnames("hosts.org_dir");
	  if (names == NULL || names[0] == NULL)
	    return NSS_STATUS_UNAVAIL;

	  result = nis_first_entry(names[0]);
	  if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
            {
              int retval;

              retval = niserr2nss (result->status);
              if (retval == NSS_STATUS_TRYAGAIN)
                {
                  *herrnop = NETDB_INTERNAL;
                  __set_errno (EAGAIN);
                }
              return retval;
            }

	}
      else
	{
	  nis_result *res2;

	  res2 = nis_next_entry(names[0], &result->cookie);
	  nis_freeresult (result);
	  result = res2;
	  if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
            {
              int retval;

              retval = niserr2nss (result->status);
              if (retval == NSS_STATUS_TRYAGAIN)
                {
                  *herrnop = NETDB_INTERNAL;
                  __set_errno (EAGAIN);
                }
              return retval;
            }
	}

      parse_res = _nss_nisplus_parse_hostent (result, host, buffer, buflen);
      if (!parse_res && errno == ERANGE)
        {
          *herrnop = NETDB_INTERNAL;
          return NSS_STATUS_TRYAGAIN;
        }

    } while (!parse_res);

  return NSS_STATUS_SUCCESS;
}

enum nss_status
_nss_nisplus_gethostent_r (struct hostent *result, char *buffer,
			   size_t buflen, int *herrnop)
{
  int status;

  __libc_lock_lock (lock);

  status = internal_nisplus_gethostent_r (result, buffer, buflen, herrnop);

  __libc_lock_unlock (lock);

  return status;
}

enum nss_status
_nss_nisplus_gethostbyname2_r (const char *name, int af, struct hostent *host,
			      char *buffer, size_t buflen, int *herrnop)
{
  int parse_res, retval;

  if (name == NULL)
    {
      __set_errno (EINVAL);
      *herrnop = NETDB_INTERNAL;
      return NSS_STATUS_NOTFOUND;
    }
  else
    {
      nis_result *result;
      char buf[strlen (name) + 255];

      /* Search at first in the alias list, and use the correct name
	 for the next search */
      sprintf(buf, "[name=%s],hosts.org_dir", name);
      result = nis_list(buf, EXPAND_NAME, NULL, NULL);

      /* If we do 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) ||
	  result->objects.objects_val[0].zo_data.zo_type != ENTRY_OBJ ||
	  strcmp(result->objects.objects_val[0].zo_data.objdata_u.en_data.en_type,
		 "hosts_tbl") != 0 ||
	  result->objects.objects_val[0].zo_data.objdata_u.en_data.en_cols.en_cols_len
	  < 3)
	sprintf(buf, "[cname=%s],hosts.org_dir", name);
      else
	sprintf(buf, "[cname=%s],hosts.org_dir", NISENTRYVAL(0, 0, result));

      nis_freeresult (result);
      result = nis_list(buf, EXPAND_NAME, NULL, NULL);

      retval = niserr2nss (result->status);
      if (retval != NSS_STATUS_SUCCESS)
        {
          if (retval == NSS_STATUS_TRYAGAIN)
            {
              __set_errno (EAGAIN);
              *herrnop = NETDB_INTERNAL;
            }
	  nis_freeresult (result);
          return retval;
        }

      parse_res = _nss_nisplus_parse_hostent (result, host, buffer, buflen);

      nis_freeresult (result);

      if (parse_res)
	return NSS_STATUS_SUCCESS;

      *herrnop = NETDB_INTERNAL;
      if (!parse_res && errno == ERANGE)
	return NSS_STATUS_TRYAGAIN;
      else
	return NSS_STATUS_NOTFOUND;
    }
}

enum nss_status
_nss_nisplus_gethostbyname_r (const char *name, struct hostent *host,
			      char *buffer, size_t buflen, int *h_errnop)
{
  if (_res.options & RES_USE_INET6)
    {
      enum nss_status status;

      status = _nss_nisplus_gethostbyname2_r (name, AF_INET6, host, buffer,
					      buflen, h_errnop);
      if (status == NSS_STATUS_SUCCESS)
        return status;
    }

  return _nss_nisplus_gethostbyname2_r (name, AF_INET, host, buffer,
					buflen, h_errnop);
}

enum nss_status
_nss_nisplus_gethostbyaddr_r (const char *addr, struct hostent *host,
			      char *buffer, size_t buflen, int *herrnop)
{
  if (addr == NULL)
    return NSS_STATUS_NOTFOUND;
  else
    {
      nis_result *result;
      char buf[24 + strlen (addr)];
      int retval, parse_res;

      sprintf(buf, "[addr=%s],hosts.org_dir", addr);

      result = nis_list(buf, EXPAND_NAME, NULL, NULL);

      retval = niserr2nss (result->status);
      if (retval != NSS_STATUS_SUCCESS)
        {
          if (retval == NSS_STATUS_TRYAGAIN)
            {
              __set_errno (EAGAIN);
              *herrnop = NETDB_INTERNAL;
            }
	  nis_freeresult (result);
          return retval;
        }

      parse_res = _nss_nisplus_parse_hostent (result, host, buffer, buflen);

      nis_freeresult (result);

      if (parse_res)
	return NSS_STATUS_SUCCESS;

      *herrnop = NETDB_INTERNAL;
      if (!parse_res && errno == ERANGE)
	return NSS_STATUS_TRYAGAIN;
      else
	return NSS_STATUS_NOTFOUND;
    }
}