Source

libtirpc / src / rpc_generic.c

Full commit
  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
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
/*
 * Copyright (c) 2009, Sun Microsystems, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - 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.
 * - Neither the name of Sun Microsystems, Inc. nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 COPYRIGHT HOLDER 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.
 */
/*
 * Copyright (c) 1986-1991 by Sun Microsystems Inc. 
 */

#include <sys/cdefs.h>

/*
 * rpc_generic.c, Miscl routines for RPC.
 *
 */
#include <pthread.h>
#include <reentrant.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/un.h>
#include <sys/resource.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <rpc/rpc.h>
#include <ctype.h>
#include <stddef.h>
#include <stdio.h>
#include <netdb.h>
#include <netconfig.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <rpc/nettype.h>
#include "rpc_com.h"

struct handle {
	NCONF_HANDLE *nhandle;
	int nflag;		/* Whether NETPATH or NETCONFIG */
	int nettype;
};

static const struct _rpcnettype {
	const char *name;
	const int type;
} _rpctypelist[] = {
	{ "netpath", _RPC_NETPATH },
	{ "visible", _RPC_VISIBLE },
	{ "circuit_v", _RPC_CIRCUIT_V },
	{ "datagram_v", _RPC_DATAGRAM_V },
	{ "circuit_n", _RPC_CIRCUIT_N },
	{ "datagram_n", _RPC_DATAGRAM_N },
	{ "tcp", _RPC_TCP },
	{ "udp", _RPC_UDP },
	{ 0, _RPC_NONE }
};

struct netid_af {
	const char	*netid;
	int		af;
	int		protocol;
};

static const struct netid_af na_cvt[] = {
	{ "udp",  AF_INET,  IPPROTO_UDP },
	{ "tcp",  AF_INET,  IPPROTO_TCP },
#ifdef INET6
	{ "udp6", AF_INET6, IPPROTO_UDP },
	{ "tcp6", AF_INET6, IPPROTO_TCP },
#endif
	{ "local", AF_LOCAL, 0 }
};

#if 0
static char *strlocase(char *);
#endif
static int getnettype(const char *);

/*
 * Cache the result of getrlimit(), so we don't have to do an
 * expensive call every time.
 */
int
__rpc_dtbsize()
{
	static int tbsize;
	struct rlimit rl;

	if (tbsize) {
		return (tbsize);
	}
	if (getrlimit(RLIMIT_NOFILE, &rl) == 0) {
		return (tbsize = (int)rl.rlim_max);
	}
	/*
	 * Something wrong.  I'll try to save face by returning a
	 * pessimistic number.
	 */
	return (32);
}


/*
 * Find the appropriate buffer size
 */
u_int
/*ARGSUSED*/
__rpc_get_t_size(af, proto, size)
	int af, proto;
	int size;	/* Size requested */
{
	int maxsize, defsize;

	maxsize = 256 * 1024;	/* XXX */
	switch (proto) {
	case IPPROTO_TCP:
		defsize = 64 * 1024;	/* XXX */
		break;
	case IPPROTO_UDP:
		defsize = UDPMSGSIZE;
		break;
	default:
		defsize = RPC_MAXDATASIZE;
		break;
	}
	if (size == 0)
		return defsize;

	/* Check whether the value is within the upper max limit */
	return (size > maxsize ? (u_int)maxsize : (u_int)size);
}

/*
 * Find the appropriate address buffer size
 */
u_int
__rpc_get_a_size(af)
	int af;
{
	switch (af) {
	case AF_INET:
		return sizeof (struct sockaddr_in);
#ifdef INET6
	case AF_INET6:
		return sizeof (struct sockaddr_in6);
#endif
	case AF_LOCAL:
		return sizeof (struct sockaddr_un);
	default:
		break;
	}
	return ((u_int)RPC_MAXADDRSIZE);
}

#if 0
static char *
strlocase(p)
	char *p;
{
	char *t = p;

	for (; *p; p++)
		if (isupper(*p))
			*p = tolower(*p);
	return (t);
}
#endif

/*
 * Returns the type of the network as defined in <rpc/nettype.h>
 * If nettype is NULL, it defaults to NETPATH.
 */
static int
getnettype(nettype)
	const char *nettype;
{
	int i;

	if ((nettype == NULL) || (nettype[0] == 0)) {
		return (_RPC_NETPATH);	/* Default */
	}

#if 0
	nettype = strlocase(nettype);
#endif
	for (i = 0; _rpctypelist[i].name; i++)
		if (strcasecmp(nettype, _rpctypelist[i].name) == 0) {
			return (_rpctypelist[i].type);
		}
	return (_rpctypelist[i].type);
}

/*
 * For the given nettype (tcp or udp only), return the first structure found.
 * This should be freed by calling freenetconfigent()
 */
struct netconfig *
__rpc_getconfip(nettype)
	const char *nettype;
{
	char *netid;
	char *netid_tcp = (char *) NULL;
	char *netid_udp = (char *) NULL;
	struct netconfig *dummy;
	extern thread_key_t tcp_key, udp_key;
	extern mutex_t tsd_lock;

	if (tcp_key == -1) {
		mutex_lock(&tsd_lock);
		if (tcp_key == -1)
			thr_keycreate(&tcp_key, free);
		mutex_unlock(&tsd_lock);
	}
	netid_tcp = (char *)thr_getspecific(tcp_key);
	if (udp_key == -1) {
		mutex_lock(&tsd_lock);
		if (udp_key == -1)
			thr_keycreate(&udp_key, free);
		mutex_unlock(&tsd_lock);
	}
	netid_udp = (char *)thr_getspecific(udp_key);
	if (!netid_udp && !netid_tcp) {
		struct netconfig *nconf;
		void *confighandle;

		if (!(confighandle = setnetconfig())) {
			syslog (LOG_ERR, "rpc: failed to open " NETCONFIG);
			return (NULL);
		}
		while ((nconf = getnetconfig(confighandle)) != NULL) {
			if (strcmp(nconf->nc_protofmly, NC_INET) == 0 ||
			    strcmp(nconf->nc_protofmly, NC_INET6) == 0) {
				if (strcmp(nconf->nc_proto, NC_TCP) == 0 &&
						netid_tcp == NULL) {
					netid_tcp = strdup(nconf->nc_netid);
					thr_setspecific(tcp_key,
							(void *) netid_tcp);
				} else
				if (strcmp(nconf->nc_proto, NC_UDP) == 0 &&
						netid_udp == NULL) {
					netid_udp = strdup(nconf->nc_netid);
					thr_setspecific(udp_key,
						(void *) netid_udp);
				}
			}
		}
		endnetconfig(confighandle);
	}
	if (strcmp(nettype, "udp") == 0)
		netid = netid_udp;
	else if (strcmp(nettype, "tcp") == 0)
		netid = netid_tcp;
	else {
		return (NULL);
	}
	if ((netid == NULL) || (netid[0] == 0)) {
		return (NULL);
	}
	dummy = getnetconfigent(netid);
	return (dummy);
}

/*
 * Returns the type of the nettype, which should then be used with
 * __rpc_getconf().
 */
void *
__rpc_setconf(nettype)
	const char *nettype;
{
	struct handle *handle;

	handle = (struct handle *) malloc(sizeof (struct handle));
	if (handle == NULL) {
		return (NULL);
	}
	switch (handle->nettype = getnettype(nettype)) {
	case _RPC_NETPATH:
	case _RPC_CIRCUIT_N:
	case _RPC_DATAGRAM_N:
		if (!(handle->nhandle = setnetpath())) {
			free(handle);
			return (NULL);
		}
		handle->nflag = TRUE;
		break;
	case _RPC_VISIBLE:
	case _RPC_CIRCUIT_V:
	case _RPC_DATAGRAM_V:
	case _RPC_TCP:
	case _RPC_UDP:
		if (!(handle->nhandle = setnetconfig())) {
		        syslog (LOG_ERR, "rpc: failed to open " NETCONFIG);
			free(handle);
			return (NULL);
		}
		handle->nflag = FALSE;
		break;
	default:
		return (NULL);
	}

	return (handle);
}

/*
 * Returns the next netconfig struct for the given "net" type.
 * __rpc_setconf() should have been called previously.
 */
struct netconfig *
__rpc_getconf(vhandle)
	void *vhandle;
{
	struct handle *handle;
	struct netconfig *nconf;

	handle = (struct handle *)vhandle;
	if (handle == NULL) {
		return (NULL);
	}
	for (;;) {
		if (handle->nflag)
			nconf = getnetpath(handle->nhandle);
		else
			nconf = getnetconfig(handle->nhandle);
		if (nconf == NULL)
			break;
		if ((nconf->nc_semantics != NC_TPI_CLTS) &&
			(nconf->nc_semantics != NC_TPI_COTS) &&
			(nconf->nc_semantics != NC_TPI_COTS_ORD))
			continue;
		switch (handle->nettype) {
		case _RPC_VISIBLE:
			if (!(nconf->nc_flag & NC_VISIBLE))
				continue;
			/* FALLTHROUGH */
		case _RPC_NETPATH:	/* Be happy */
			break;
		case _RPC_CIRCUIT_V:
			if (!(nconf->nc_flag & NC_VISIBLE))
				continue;
			/* FALLTHROUGH */
		case _RPC_CIRCUIT_N:
			if ((nconf->nc_semantics != NC_TPI_COTS) &&
				(nconf->nc_semantics != NC_TPI_COTS_ORD))
				continue;
			break;
		case _RPC_DATAGRAM_V:
			if (!(nconf->nc_flag & NC_VISIBLE))
				continue;
			/* FALLTHROUGH */
		case _RPC_DATAGRAM_N:
			if (nconf->nc_semantics != NC_TPI_CLTS)
				continue;
			break;
		case _RPC_TCP:
			if (((nconf->nc_semantics != NC_TPI_COTS) &&
				(nconf->nc_semantics != NC_TPI_COTS_ORD)) ||
				(strcmp(nconf->nc_protofmly, NC_INET)
#ifdef INET6
				 && strcmp(nconf->nc_protofmly, NC_INET6))
#else
				)
#endif
				||
				strcmp(nconf->nc_proto, NC_TCP))
				continue;
			break;
		case _RPC_UDP:
			if ((nconf->nc_semantics != NC_TPI_CLTS) ||
				(strcmp(nconf->nc_protofmly, NC_INET)
#ifdef INET6
				&& strcmp(nconf->nc_protofmly, NC_INET6))
#else
				)
#endif
				||
				strcmp(nconf->nc_proto, NC_UDP))
				continue;
			break;
		}
		break;
	}
	return (nconf);
}

void
__rpc_endconf(vhandle)
	void * vhandle;
{
	struct handle *handle;

	handle = (struct handle *) vhandle;
	if (handle == NULL) {
		return;
	}
	if (handle->nflag) {
		endnetpath(handle->nhandle);
	} else {
		endnetconfig(handle->nhandle);
	}
	free(handle);
}

/*
 * Used to ping the NULL procedure for clnt handle.
 * Returns NULL if fails, else a non-NULL pointer.
 */
void *
rpc_nullproc(clnt)
	CLIENT *clnt;
{
	struct timeval TIMEOUT = {25, 0};

	if (clnt_call(clnt, NULLPROC, (xdrproc_t) xdr_void, NULL,
		(xdrproc_t) xdr_void, NULL, TIMEOUT) != RPC_SUCCESS) {
		return (NULL);
	}
	return ((void *) clnt);
}

/*
 * Try all possible transports until
 * one succeeds in finding the netconf for the given fd.
 */
struct netconfig *
__rpcgettp(fd)
	int fd;
{
	const char *netid;
	struct __rpc_sockinfo si;

	if (!__rpc_fd2sockinfo(fd, &si))
		return NULL;

	if (!__rpc_sockinfo2netid(&si, &netid))
		return NULL;

	/*LINTED const castaway*/
	return getnetconfigent((char *)netid);
}

int
__rpc_fd2sockinfo(int fd, struct __rpc_sockinfo *sip)
{
	socklen_t len;
	int type, proto;
	struct sockaddr_storage ss;

	len = sizeof ss;
	if (getsockname(fd, (struct sockaddr *)&ss, &len) < 0)
		return 0;
	sip->si_alen = len;

	len = sizeof type;
	if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &type, &len) < 0)
		return 0;

	/* XXX */
	if (ss.ss_family != AF_LOCAL) {
		if (type == SOCK_STREAM)
			proto = IPPROTO_TCP;
		else if (type == SOCK_DGRAM)
			proto = IPPROTO_UDP;
		else
			return 0;
	} else
		proto = 0;

	sip->si_af = ss.ss_family;
	sip->si_proto = proto;
	sip->si_socktype = type;

	return 1;
}

/*
 * Linear search, but the number of entries is small.
 */
int
__rpc_nconf2sockinfo(const struct netconfig *nconf, struct __rpc_sockinfo *sip)
{
	int i;

	for (i = 0; i < (sizeof na_cvt) / (sizeof (struct netid_af)); i++)
		if (strcmp(na_cvt[i].netid, nconf->nc_netid) == 0 || (
		    strcmp(nconf->nc_netid, "unix") == 0 &&
		    strcmp(na_cvt[i].netid, "local") == 0)) {
			sip->si_af = na_cvt[i].af;
			sip->si_proto = na_cvt[i].protocol;
			sip->si_socktype =
			    __rpc_seman2socktype((int)nconf->nc_semantics);
			if (sip->si_socktype == -1)
				return 0;
			sip->si_alen = __rpc_get_a_size(sip->si_af);
			return 1;
		}

	return 0;
}

int
__rpc_nconf2fd_flags(const struct netconfig *nconf, int flags)
{
	struct __rpc_sockinfo si;
	int fd;

	if (!__rpc_nconf2sockinfo(nconf, &si))
		return 0;

	if ((fd = socket(si.si_af, si.si_socktype | flags, si.si_proto)) >= 0 &&
	    si.si_af == AF_INET6) {
		int val = 1;

#ifdef INET6
		setsockopt(fd, SOL_IPV6, IPV6_V6ONLY, &val, sizeof(val));
#endif
	}
	return fd;
}

int
__rpc_nconf2fd(const struct netconfig *nconf)
{
	return __rpc_nconf2fd_flags(nconf, 0);
}

int
__rpc_sockinfo2netid(struct __rpc_sockinfo *sip, const char **netid)
{
	int i;
	struct netconfig *nconf;

	nconf = getnetconfigent("local");

	for (i = 0; i < (sizeof na_cvt) / (sizeof (struct netid_af)); i++) {
		if (na_cvt[i].af == sip->si_af &&
		    na_cvt[i].protocol == sip->si_proto) {
			if (strcmp(na_cvt[i].netid, "local") == 0 && nconf == NULL) {
				if (netid)
					*netid = "unix";
			} else {
				if (netid)
					*netid = na_cvt[i].netid;
			}
			if (nconf != NULL)
				freenetconfigent(nconf);
			return 1;
		}
	}
	if (nconf != NULL)
		freenetconfigent(nconf);

	return 0;
}

char *
taddr2uaddr(const struct netconfig *nconf, const struct netbuf *nbuf)
{
	struct __rpc_sockinfo si;

	if (!__rpc_nconf2sockinfo(nconf, &si))
		return NULL;
	return __rpc_taddr2uaddr_af(si.si_af, nbuf);
}

struct netbuf *
uaddr2taddr(const struct netconfig *nconf, const char *uaddr)
{
	struct __rpc_sockinfo si;
	
	if (!__rpc_nconf2sockinfo(nconf, &si))
		return NULL;
	return __rpc_uaddr2taddr_af(si.si_af, uaddr);
}

char *
__rpc_taddr2uaddr_af(int af, const struct netbuf *nbuf)
{
	char *ret;
	struct sockaddr_in *sin;
	struct sockaddr_un *sun;
	char namebuf[INET_ADDRSTRLEN];
#ifdef INET6
	struct sockaddr_in6 *sin6;
	char namebuf6[INET6_ADDRSTRLEN];
#endif
	u_int16_t port;

	if (nbuf->len <= 0)
		return NULL;

	switch (af) {
	case AF_INET:
		sin = nbuf->buf;
		if (inet_ntop(af, &sin->sin_addr, namebuf, sizeof namebuf)
		    == NULL)
			return NULL;
		port = ntohs(sin->sin_port);
		if (asprintf(&ret, "%s.%u.%u", namebuf, ((u_int32_t)port) >> 8,
		    port & 0xff) < 0)
			return NULL;
		break;
#ifdef INET6
	case AF_INET6:
		sin6 = nbuf->buf;
		if (inet_ntop(af, &sin6->sin6_addr, namebuf6, sizeof namebuf6)
		    == NULL)
			return NULL;
		port = ntohs(sin6->sin6_port);
		if (asprintf(&ret, "%s.%u.%u", namebuf6, ((u_int32_t)port) >> 8,
		    port & 0xff) < 0)
			return NULL;
		break;
#endif
	case AF_LOCAL:
		sun = nbuf->buf;
		/*	if (asprintf(&ret, "%.*s", (int)(sun->sun_len -
		    offsetof(struct sockaddr_un, sun_path)),
		    sun->sun_path) < 0)*/
		if (asprintf(&ret, "%.*s", (int)(sizeof(*sun) -
						 offsetof(struct sockaddr_un, sun_path)),
			     sun->sun_path) < 0)

			return (NULL);
		break;
	default:
		return NULL;
	}

	return ret;
}

struct netbuf *
__rpc_uaddr2taddr_af(int af, const char *uaddr)
{
	struct netbuf *ret = NULL;
	char *addrstr, *p;
	unsigned port, portlo, porthi;
	struct sockaddr_in *sin;
#ifdef INET6
	struct sockaddr_in6 *sin6;
#endif
	struct sockaddr_un *sun;

	port = 0;
	sin = NULL;
	addrstr = strdup(uaddr);
	if (addrstr == NULL)
		return NULL;

	/*
	 * AF_LOCAL addresses are expected to be absolute
	 * pathnames, anything else will be AF_INET or AF_INET6.
	 */
	if (*addrstr != '/') {
		p = strrchr(addrstr, '.');
		if (p == NULL)
			goto out;
		portlo = (unsigned)atoi(p + 1);
		*p = '\0';

		p = strrchr(addrstr, '.');
		if (p == NULL)
			goto out;
		porthi = (unsigned)atoi(p + 1);
		*p = '\0';
		port = (porthi << 8) | portlo;
	}

	ret = (struct netbuf *)malloc(sizeof *ret);
	if (ret == NULL)
		goto out;
	
	switch (af) {
	case AF_INET:
		sin = (struct sockaddr_in *)malloc(sizeof *sin);
		if (sin == NULL)
			goto out;
		memset(sin, 0, sizeof *sin);
		sin->sin_family = AF_INET;
		sin->sin_port = htons(port);
		if (inet_pton(AF_INET, addrstr, &sin->sin_addr) <= 0) {
			free(sin);
			free(ret);
			ret = NULL;
			goto out;
		}
		ret->maxlen = ret->len = sizeof *sin;
		ret->buf = sin;
		break;
#ifdef INET6
	case AF_INET6:
		sin6 = (struct sockaddr_in6 *)malloc(sizeof *sin6);
		if (sin6 == NULL)
			goto out;
		memset(sin6, 0, sizeof *sin6);
		sin6->sin6_family = AF_INET6;
		sin6->sin6_port = htons(port);
		if (inet_pton(AF_INET6, addrstr, &sin6->sin6_addr) <= 0) {
			free(sin6);
			free(ret);
			ret = NULL;
			goto out;
		}
		ret->maxlen = ret->len = sizeof *sin6;
		ret->buf = sin6;
		break;
#endif
	case AF_LOCAL:
		sun = (struct sockaddr_un *)malloc(sizeof *sun);
		if (sun == NULL)
			goto out;
		memset(sun, 0, sizeof *sun);
		sun->sun_family = AF_LOCAL;
		strncpy(sun->sun_path, addrstr, sizeof(sun->sun_path) - 1);
		ret->len = SUN_LEN(sun);
		ret->maxlen = sizeof(struct sockaddr_un);
		ret->buf = sun;
		break;
	default:
		break;
	}
out:
	free(addrstr);
	return ret;
}

int
__rpc_seman2socktype(int semantics)
{
	switch (semantics) {
	case NC_TPI_CLTS:
		return SOCK_DGRAM;
	case NC_TPI_COTS_ORD:
		return SOCK_STREAM;
	case NC_TPI_RAW:
		return SOCK_RAW;
	default:
		break;
	}

	return -1;
}

int
__rpc_socktype2seman(int socktype)
{
	switch (socktype) {
	case SOCK_DGRAM:
		return NC_TPI_CLTS;
	case SOCK_STREAM:
		return NC_TPI_COTS_ORD;
	case SOCK_RAW:
		return NC_TPI_RAW;
	default:
		break;
	}

	return -1;
}

/*
 * XXXX - IPv6 scope IDs can't be handled in universal addresses.
 * Here, we compare the original server address to that of the RPC
 * service we just received back from a call to rpcbind on the remote
 * machine. If they are both "link local" or "site local", copy
 * the scope id of the server address over to the service address.
 */
int
__rpc_fixup_addr(struct netbuf *new, const struct netbuf *svc)
{
#ifdef INET6
	struct sockaddr *sa_new, *sa_svc;
	struct sockaddr_in6 *sin6_new, *sin6_svc;

	sa_svc = (struct sockaddr *)svc->buf;
	sa_new = (struct sockaddr *)new->buf;

	if (sa_new->sa_family == sa_svc->sa_family &&
	    sa_new->sa_family == AF_INET6) {
		sin6_new = (struct sockaddr_in6 *)new->buf;
		sin6_svc = (struct sockaddr_in6 *)svc->buf;

		if ((IN6_IS_ADDR_LINKLOCAL(&sin6_new->sin6_addr) &&
		     IN6_IS_ADDR_LINKLOCAL(&sin6_svc->sin6_addr)) ||
		    (IN6_IS_ADDR_SITELOCAL(&sin6_new->sin6_addr) &&
		     IN6_IS_ADDR_SITELOCAL(&sin6_svc->sin6_addr))) {
			sin6_new->sin6_scope_id = sin6_svc->sin6_scope_id;
		}
	}
#endif
	return 1;
}

int
__rpc_sockisbound(int fd)
{
	struct sockaddr_storage ss;
	union {
		struct sockaddr_in  sin;
		struct sockaddr_in6 sin6;
		struct sockaddr_un  usin;
	} u_addr;
	socklen_t slen;

	slen = sizeof (struct sockaddr_storage);
	if (getsockname(fd, (struct sockaddr *)(void *)&ss, &slen) < 0)
		return 0;

	switch (ss.ss_family) {
		case AF_INET:
			memcpy(&u_addr.sin, &ss, sizeof(u_addr.sin)); 
			return (u_addr.sin.sin_port != 0);
#ifdef INET6
		case AF_INET6:
			memcpy(&u_addr.sin6, &ss, sizeof(u_addr.sin6)); 
			return (u_addr.sin6.sin6_port != 0);
#endif
		case AF_LOCAL:
			/* XXX check this */
			memcpy(&u_addr.usin, &ss, sizeof(u_addr.usin)); 
			return (u_addr.usin.sun_path[0] != 0);
		default:
			break;
	}

	return 0;
}

/*
 * Helper function to set up a netbuf
 */
struct netbuf *
__rpc_set_netbuf(struct netbuf *nb, const void *ptr, size_t len)
{
	if (nb->len != len) {
		if (nb->len)
			mem_free(nb->buf, nb->len);
		nb->buf = mem_alloc(len);
		if (nb->buf == NULL)
			return NULL;

		nb->maxlen = nb->len = len;
	}
	memcpy(nb->buf, ptr, len);
	return nb;
}