summaryrefslogtreecommitdiffstats
path: root/freebsd/lib/libc/net/getnetnamadr.c
blob: 5a30b5bfcf5434da6f862abd0634048ff12ce9bc (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
445
446
447
448
449
450
451
452
453
454
455
456
457
458
/*-
 * Copyright (c) 1994, Garrett Wollman
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "namespace.h"
#include "reentrant.h"
#include <rtems/bsd/sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <nsswitch.h>
#include "un-namespace.h"
#include "netdb_private.h"
#ifdef NS_CACHING
#include "nscache.h"
#endif

extern int _ht_getnetbyname(void *, void *, va_list);
extern int _dns_getnetbyname(void *, void *, va_list);
extern int _nis_getnetbyname(void *, void *, va_list);
extern int _ht_getnetbyaddr(void *, void *, va_list);
extern int _dns_getnetbyaddr(void *, void *, va_list);
extern int _nis_getnetbyaddr(void *, void *, va_list);

/* Network lookup order if nsswitch.conf is broken or nonexistant */
static const ns_src default_src[] = {
	{ NSSRC_FILES, NS_SUCCESS },
	{ NSSRC_DNS, NS_SUCCESS },
	{ 0 }
};

NETDB_THREAD_ALLOC(netent_data)
NETDB_THREAD_ALLOC(netdata)

#ifdef NS_CACHING
static int
net_id_func(char *buffer, size_t *buffer_size, va_list ap, void *cache_mdata)
{
	char *name;
	uint32_t net;
	int type;

	size_t desired_size, size;
	enum nss_lookup_type lookup_type;
	int res = NS_UNAVAIL;

	lookup_type = (enum nss_lookup_type)cache_mdata;
	switch (lookup_type) {
	case nss_lt_name:
		name = va_arg(ap, char *);

		size = strlen(name);
		desired_size = sizeof(enum nss_lookup_type) + size + 1;
		if (desired_size > *buffer_size) {
			res = NS_RETURN;
			goto fin;
		}

		memcpy(buffer, &lookup_type, sizeof(enum nss_lookup_type));
		memcpy(buffer + sizeof(enum nss_lookup_type), name, size + 1);

		res = NS_SUCCESS;
		break;
	case nss_lt_id:
		net = va_arg(ap, uint32_t);
		type = va_arg(ap, int);

		desired_size = sizeof(enum nss_lookup_type) +
		    sizeof(uint32_t) + sizeof(int);
		if (desired_size > *buffer_size) {
			res = NS_RETURN;
			goto fin;
		}

		memcpy(buffer, &lookup_type, sizeof(enum nss_lookup_type));
		memcpy(buffer + sizeof(enum nss_lookup_type), &net,
		    sizeof(uint32_t));
		memcpy(buffer + sizeof(enum nss_lookup_type) + sizeof(uint32_t),
		    &type, sizeof(int));

		res = NS_SUCCESS;
		break;
	default:
		/* should be unreachable */
		return (NS_UNAVAIL);
	}

fin:
	*buffer_size = desired_size;
	return (res);
}


static int
net_marshal_func(char *buffer, size_t *buffer_size, void *retval, va_list ap,
    void *cache_mdata)
{
	char *name;
	uint32_t net;
	int type;
	struct netent *ne;
	char *orig_buf;
	size_t orig_buf_size;

	struct netent new_ne;
	size_t desired_size, size, aliases_size;
	char *p;
	char **alias;

	switch ((enum nss_lookup_type)cache_mdata) {
	case nss_lt_name:
		name = va_arg(ap, char *);
		break;
	case nss_lt_id:
		net = va_arg(ap, uint32_t);
		type = va_arg(ap, int);
	break;
	case nss_lt_all:
		break;
	default:
		/* should be unreachable */
		return (NS_UNAVAIL);
	}

	ne = va_arg(ap, struct netent *);
	orig_buf = va_arg(ap, char *);
	orig_buf_size = va_arg(ap, size_t);

	desired_size = _ALIGNBYTES + sizeof(struct netent) + sizeof(char *);
	if (ne->n_name != NULL)
		desired_size += strlen(ne->n_name) + 1;

	if (ne->n_aliases != NULL) {
		aliases_size = 0;
		for (alias = ne->n_aliases; *alias; ++alias) {
			desired_size += strlen(*alias) + 1;
			++aliases_size;
		}

		desired_size += _ALIGNBYTES +
		    (aliases_size + 1) * sizeof(char *);
	}

	if (*buffer_size < desired_size) {
		/* this assignment is here for future use */
		*buffer_size = desired_size;
		return (NS_RETURN);
	}

	memcpy(&new_ne, ne, sizeof(struct netent));

	*buffer_size = desired_size;
	memset(buffer, 0, desired_size);
	p = buffer + sizeof(struct netent) + sizeof(char *);
	memcpy(buffer + sizeof(struct netent), &p, sizeof(char *));
	p = (char *)_ALIGN(p);

	if (new_ne.n_name != NULL) {
		size = strlen(new_ne.n_name);
		memcpy(p, new_ne.n_name, size);
		new_ne.n_name = p;
		p += size + 1;
	}

	if (new_ne.n_aliases != NULL) {
		p = (char *)_ALIGN(p);
		memcpy(p, new_ne.n_aliases, sizeof(char *) * aliases_size);
		new_ne.n_aliases = (char **)p;
		p += sizeof(char *) * (aliases_size + 1);

		for (alias = new_ne.n_aliases; *alias; ++alias) {
			size = strlen(*alias);
			memcpy(p, *alias, size);
			*alias = p;
			p += size + 1;
		}
	}

	memcpy(buffer, &new_ne, sizeof(struct netent));
	return (NS_SUCCESS);
}

static int
net_unmarshal_func(char *buffer, size_t buffer_size, void *retval, va_list ap,
    void *cache_mdata)
{
	char *name;
	uint32_t net;
	int type;
	struct netent *ne;
	char *orig_buf;
	size_t orig_buf_size;
	int *ret_errno;

	char *p;
	char **alias;

	switch ((enum nss_lookup_type)cache_mdata) {
	case nss_lt_name:
		name = va_arg(ap, char *);
		break;
	case nss_lt_id:
		net = va_arg(ap, uint32_t);
		type = va_arg(ap, int);
		break;
	case nss_lt_all:
		break;
	default:
		/* should be unreachable */
		return (NS_UNAVAIL);
	}

	ne = va_arg(ap, struct netent *);
	orig_buf = va_arg(ap, char *);
	orig_buf_size = va_arg(ap, size_t);
	ret_errno = va_arg(ap, int *);

	if (orig_buf_size <
	    buffer_size - sizeof(struct netent) - sizeof(char *)) {
		*ret_errno = ERANGE;
		return (NS_RETURN);
	}

	memcpy(ne, buffer, sizeof(struct netent));
	memcpy(&p, buffer + sizeof(struct netent), sizeof(char *));

	orig_buf = (char *)_ALIGN(orig_buf);
	memcpy(orig_buf, buffer + sizeof(struct netent) + sizeof(char *) +
	    _ALIGN(p) - (size_t)p,
	    buffer_size - sizeof(struct netent) - sizeof(char *) -
	    _ALIGN(p) + (size_t)p);
	p = (char *)_ALIGN(p);

	NS_APPLY_OFFSET(ne->n_name, orig_buf, p, char *);
	if (ne->n_aliases != NULL) {
		NS_APPLY_OFFSET(ne->n_aliases, orig_buf, p, char **);

		for (alias = ne->n_aliases; *alias; ++alias)
			NS_APPLY_OFFSET(*alias, orig_buf, p, char *);
	}

	if (retval != NULL)
		*((struct netent **)retval) = ne;

	return (NS_SUCCESS);
}
#endif /* NS_CACHING */

static void
netent_data_free(void *ptr)
{
	struct netent_data *ned = ptr;

	if (ned == NULL)
		return;
	ned->stayopen = 0;
	_endnethtent(ned);
	free(ned);
}

static void
netdata_free(void *ptr)
{
	free(ptr);
}

int
__copy_netent(struct netent *ne, struct netent *nptr, char *buf, size_t buflen)
{
	char *cp;
	int i, n;
	int numptr, len;

	/* Find out the amount of space required to store the answer. */
	numptr = 1; /* NULL ptr */
	len = (char *)ALIGN(buf) - buf;
	for (i = 0; ne->n_aliases[i]; i++, numptr++) {
		len += strlen(ne->n_aliases[i]) + 1;
	}
	len += strlen(ne->n_name) + 1;
	len += numptr * sizeof(char*);

	if (len > (int)buflen) {
		errno = ERANGE;
		return (-1);
	}

	/* copy net value and type */
	nptr->n_addrtype = ne->n_addrtype;
	nptr->n_net = ne->n_net;

	cp = (char *)ALIGN(buf) + numptr * sizeof(char *);

	/* copy official name */
	n = strlen(ne->n_name) + 1;
	strcpy(cp, ne->n_name);
	nptr->n_name = cp;
	cp += n;

	/* copy aliases */
	nptr->n_aliases = (char **)ALIGN(buf);
	for (i = 0 ; ne->n_aliases[i]; i++) {
		n = strlen(ne->n_aliases[i]) + 1;
		strcpy(cp, ne->n_aliases[i]);
		nptr->n_aliases[i] = cp;
		cp += n;
	}
	nptr->n_aliases[i] = NULL;

	return (0);
}

int
getnetbyname_r(const char *name, struct netent *ne, char *buffer,
    size_t buflen, struct netent **result, int *h_errorp)
{
#ifdef NS_CACHING
	static const nss_cache_info cache_info =
    		NS_COMMON_CACHE_INFO_INITIALIZER(
		networks, (void *)nss_lt_name,
		net_id_func, net_marshal_func, net_unmarshal_func);
#endif
	static const ns_dtab dtab[] = {
		NS_FILES_CB(_ht_getnetbyname, NULL)
		{ NSSRC_DNS, _dns_getnetbyname, NULL },
		NS_NIS_CB(_nis_getnetbyname, NULL) /* force -DHESIOD */
#ifdef NS_CACHING
		NS_CACHE_CB(&cache_info)
#endif
		{ 0 }
	};
	int rval, ret_errno = 0;

	rval = _nsdispatch((void *)result, dtab, NSDB_NETWORKS,
	    "getnetbyname_r", default_src, name, ne, buffer, buflen,
	    &ret_errno, h_errorp);

	if (rval != NS_SUCCESS) {
		errno = ret_errno;
		return ((ret_errno != 0) ? ret_errno : -1);
	}
	return (0);
}

int
getnetbyaddr_r(uint32_t addr, int af, struct netent *ne, char *buffer,
    size_t buflen, struct netent **result, int *h_errorp)
{
#ifdef NS_CACHING
	static const nss_cache_info cache_info =
    		NS_COMMON_CACHE_INFO_INITIALIZER(
		networks, (void *)nss_lt_id,
		net_id_func, net_marshal_func, net_unmarshal_func);
#endif
	static const ns_dtab dtab[] = {
		NS_FILES_CB(_ht_getnetbyaddr, NULL)
		{ NSSRC_DNS, _dns_getnetbyaddr, NULL },
		NS_NIS_CB(_nis_getnetbyaddr, NULL) /* force -DHESIOD */
#ifdef NS_CACHING
		NS_CACHE_CB(&cache_info)
#endif
		{ 0 }
	};
	int rval, ret_errno = 0;

	rval = _nsdispatch((void *)result, dtab, NSDB_NETWORKS,
	    "getnetbyaddr_r", default_src, addr, af, ne, buffer, buflen,
	    &ret_errno, h_errorp);

	if (rval != NS_SUCCESS) {
		errno = ret_errno;
		return ((ret_errno != 0) ? ret_errno : -1);
	}
	return (0);
}

struct netent *
getnetbyname(const char *name)
{
	struct netdata *nd;
	struct netent *rval;
	int ret_h_errno;

	if ((nd = __netdata_init()) == NULL)
		return (NULL);
	if (getnetbyname_r(name, &nd->net, nd->data, sizeof(nd->data), &rval,
	    &ret_h_errno) != 0)
		return (NULL);
	return (rval);
}

struct netent *
getnetbyaddr(uint32_t addr, int af)
{
	struct netdata *nd;
	struct netent *rval;
	int ret_h_errno;

	if ((nd = __netdata_init()) == NULL)
		return (NULL);
	if (getnetbyaddr_r(addr, af, &nd->net, nd->data, sizeof(nd->data),
	    &rval, &ret_h_errno) != 0)
		return (NULL);
	return (rval);
}

void
setnetent(int stayopen)
{
	struct netent_data *ned;

	if ((ned = __netent_data_init()) == NULL)
		return;
	_setnethtent(stayopen, ned);
	_setnetdnsent(stayopen);
}

void
endnetent(void)
{
	struct netent_data *ned;

	if ((ned = __netent_data_init()) == NULL)
		return;
	_endnethtent(ned);
	_endnetdnsent();
}