about summary refs log tree commit diff
path: root/nis/nss_nis/nis-service.c
blob: 6e086e42a32a05aeff2a0da7ea2aee6d698317eb (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
/* Copyright (C) 1996-2001, 2002, 2003, 2004 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Thorsten Kukuk <kukuk@suse.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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <nss.h>
#include <netdb.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>
#include <bits/libc-lock.h>
#include <rpcsvc/yp.h>
#include <rpcsvc/ypclnt.h>

#include "nss-nis.h"


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

__libc_lock_define_initialized (static, lock)

struct response_t
{
  struct response_t *next;
  char val[0];
};

struct intern_t
{
  struct response_t *start;
  struct response_t *next;
};
typedef struct intern_t intern_t;

static intern_t intern = { NULL, NULL };

struct search_t
{
  const char *name;
  const char *proto;
  int port;
  enum nss_status status;
  struct servent *serv;
  char *buffer;
  size_t buflen;
  int *errnop;
};

static int
saveit (int instatus, char *inkey, int inkeylen, char *inval,
        int invallen, char *indata)
{
  intern_t *intern = (intern_t *) indata;

  if (instatus != YP_TRUE)
    return instatus;

  if (inkey && inkeylen > 0 && inval && invallen > 0)
    {
      struct response_t *newp = malloc (sizeof (struct response_t)
					+ invallen + 1);
      if (newp == NULL)
	return YP_FALSE; /* We have no error code for out of memory */

      if (intern->start == NULL)
	intern->start = newp;
      else
	intern->next->next = newp;
      intern->next = newp;

      newp->next = NULL;
      *((char *) mempcpy (newp->val, inval, invallen)) = '\0';
    }

  return 0;
}

static int
dosearch (int instatus, char *inkey, int inkeylen, char *inval,
	  int invallen, char *indata)
{
  struct search_t *req = (struct search_t *) indata;

  if (instatus != YP_TRUE)
    return 1;

  if (inkey && inkeylen > 0 && inval && invallen > 0)
    {
      struct parser_data *pdata = (void *) req->buffer;
      int parse_res;
      char *p;

      if ((size_t) (invallen + 1) > req->buflen)
	{
	  *req->errnop = ERANGE;
	  req->status = NSS_STATUS_TRYAGAIN;
	  return 1;
	}

      p = strncpy (req->buffer, inval, invallen);
      req->buffer[invallen] = '\0';
      while (isspace (*p))
        ++p;

      parse_res = _nss_files_parse_servent (p, req->serv, pdata, req->buflen,
					    req->errnop);
      if (parse_res == -1)
	{
	  req->status = NSS_STATUS_TRYAGAIN;
	  return 1;
	}

      if (!parse_res)
        return 0;

      if (req->proto != NULL && strcmp (req->serv->s_proto, req->proto) != 0)
	return 0;

      if (req->port != -1 && req->serv->s_port != req->port)
	return 0;

      if (req->name != NULL && strcmp (req->serv->s_name, req->name) != 0)
	{
	  char **cp;
	  for (cp = req->serv->s_aliases; *cp; cp++)
	    if (strcmp (req->name, *cp) == 0)
	      break;

	  if (*cp == NULL)
	    return 0;
	}

      req->status = NSS_STATUS_SUCCESS;
      return 1;
    }

  return 0;
}

static enum nss_status
internal_nis_endservent (intern_t * intern)
{
  while (intern->start != NULL)
    {
      intern->next = intern->start;
      intern->start = intern->start->next;
      free (intern->next);
    }

  return NSS_STATUS_SUCCESS;
}

enum nss_status
_nss_nis_endservent (void)
{
  enum nss_status status;

  __libc_lock_lock (lock);

  status = internal_nis_endservent (&intern);

  __libc_lock_unlock (lock);

  return status;
}

static enum nss_status
internal_nis_setservent (intern_t *intern)
{
  char *domainname;
  struct ypall_callback ypcb;
  enum nss_status status;

  if (yp_get_default_domain (&domainname))
    return NSS_STATUS_UNAVAIL;

  (void) internal_nis_endservent (intern);

  ypcb.foreach = saveit;
  ypcb.data = (char *) intern;
  status = yperr2nss (yp_all (domainname, "services.byname", &ypcb));
  intern->next = intern->start;

  return status;
}

enum nss_status
_nss_nis_setservent (int stayopen)
{
  enum nss_status status;

  __libc_lock_lock (lock);

  status = internal_nis_setservent (&intern);

  __libc_lock_unlock (lock);

  return status;
}

static enum nss_status
internal_nis_getservent_r (struct servent *serv, char *buffer,
			   size_t buflen, int *errnop, intern_t *data)
{
  struct parser_data *pdata = (void *) buffer;
  int parse_res;
  char *p;

  if (data->start == NULL)
    internal_nis_setservent (data);

  /* Get the next entry until we found a correct one. */
  do
    {
      if (data->next == NULL)
	return NSS_STATUS_NOTFOUND;

      p = strncpy (buffer, data->next->val, buflen);
      while (isspace (*p))
        ++p;

      parse_res = _nss_files_parse_servent (p, serv, pdata, buflen, errnop);
      if (parse_res == -1)
        return NSS_STATUS_TRYAGAIN;
      data->next = data->next->next;
    }
  while (!parse_res);

  return NSS_STATUS_SUCCESS;
}

enum nss_status
_nss_nis_getservent_r (struct servent *serv, char *buffer, size_t buflen,
		       int *errnop)
{
  enum nss_status status;

  __libc_lock_lock (lock);

  status = internal_nis_getservent_r (serv, buffer, buflen, errnop, &intern);

  __libc_lock_unlock (lock);

  return status;
}

enum nss_status
_nss_nis_getservbyname_r (const char *name, const char *protocol,
			  struct servent *serv, char *buffer, size_t buflen,
			  int *errnop)
{
  enum nss_status status;
  char *domain;

  if (name == NULL)
    {
      *errnop = EINVAL;
      return NSS_STATUS_UNAVAIL;
    }

  if (yp_get_default_domain (&domain))
    return NSS_STATUS_UNAVAIL;

  /* If the protocol is given, we could try if our NIS server knows
     about services.byservicename map. If yes, we only need one query.  */
  char key[strlen (name) + (protocol ? strlen (protocol) : 0) + 2];
  char *cp, *result;
  size_t keylen, len;
  int int_len;

  /* key is: "name/proto" */
  cp = stpcpy (key, name);
  if (protocol)
    {
      *cp++ = '/';
      strcpy (cp, protocol);
    }
  keylen = strlen (key);
  status = yperr2nss (yp_match (domain, "services.byservicename", key,
				keylen, &result, &int_len));
  len = int_len;

  /* If we found the key, it's ok and parse the result. If not,
     fall through and parse the complete table. */
  if (status == NSS_STATUS_SUCCESS)
    {
      struct parser_data *pdata = (void *) buffer;
      int parse_res;
      char *p;

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

      p = strncpy (buffer, result, len);
      buffer[len] = '\0';
      while (isspace (*p))
	++p;
      free (result);
      parse_res = _nss_files_parse_servent (p, serv, pdata,
					    buflen, errnop);
      if (parse_res < 0)
	{
	  if (parse_res == -1)
	    return NSS_STATUS_TRYAGAIN;
	  else
	    return NSS_STATUS_NOTFOUND;
	}
      else
	return NSS_STATUS_SUCCESS;
    }

  struct ypall_callback ypcb;
  struct search_t req;

  ypcb.foreach = dosearch;
  ypcb.data = (char *) &req;
  req.name = name;
  req.proto = protocol;
  req.port = -1;
  req.serv = serv;
  req.buffer = buffer;
  req.buflen = buflen;
  req.errnop = errnop;
  req.status = NSS_STATUS_NOTFOUND;
  status = yperr2nss (yp_all (domain, "services.byname", &ypcb));

  if (status != NSS_STATUS_SUCCESS)
    return status;

  return req.status;
}

enum nss_status
_nss_nis_getservbyport_r (int port, const char *protocol,
			  struct servent *serv, char *buffer,
			  size_t buflen, int *errnop)
{
  enum nss_status status;
  char *domain;

  if (yp_get_default_domain (&domain))
    return NSS_STATUS_UNAVAIL;

  /* If the protocol is given, we only need one query.
     Otherwise try first port/tcp, then port/udp and then fallback
     to sequential scanning of services.byname.  */
  const char *proto = protocol != NULL ? protocol : "tcp";
  do
    {
      char key[sizeof (int) * 3 + strlen (proto) + 2];
      char *result;
      size_t keylen, len;
      int int_len;

      /* key is: "port/proto" */
      keylen = snprintf (key, sizeof (key), "%d/%s", ntohs (port), proto);
      status = yperr2nss (yp_match (domain, "services.byname", key,
				    keylen, &result, &int_len));
      len = int_len;

      /* If we found the key, it's ok and parse the result. If not,
	 fall through and parse the complete table. */
      if (status == NSS_STATUS_SUCCESS)
	{
	  struct parser_data *pdata = (void *) buffer;
	  int parse_res;
	  char *p;

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

	  p = strncpy (buffer, result, len);
	  buffer[len] = '\0';
	  while (isspace (*p))
	    ++p;
	  free (result);
	  parse_res = _nss_files_parse_servent (p, serv, pdata,
						buflen, errnop);
	  if (parse_res < 0)
	    {
	      if (parse_res == -1)
		return NSS_STATUS_TRYAGAIN;
	      else
		return NSS_STATUS_NOTFOUND;
	    }
	  else
	    return NSS_STATUS_SUCCESS;
	}
    }
  while (protocol == NULL && (proto[0] == 't' ? (proto = "udp") : NULL));

  if (port == -1)
    return NSS_STATUS_NOTFOUND;

  struct ypall_callback ypcb;
  struct search_t req;

  ypcb.foreach = dosearch;
  ypcb.data = (char *) &req;
  req.name = NULL;
  req.proto = protocol;
  req.port = port;
  req.serv = serv;
  req.buffer = buffer;
  req.buflen = buflen;
  req.errnop = errnop;
  req.status = NSS_STATUS_NOTFOUND;
  status = yperr2nss (yp_all (domain, "services.byname", &ypcb));

  if (status != NSS_STATUS_SUCCESS)
    return status;

  return req.status;
}