xref: /freebsd/lib/libc/rpc/rpc_generic.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
1 /*	$NetBSD: rpc_generic.c,v 1.4 2000/09/28 09:07:04 kleink Exp $	*/
2 
3 /*
4  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
5  * unrestricted use provided that this legend is included on all tape
6  * media and as a part of the software program in whole or part.  Users
7  * may copy or modify Sun RPC without charge, but are not authorized
8  * to license or distribute it to anyone else except as part of a product or
9  * program developed by the user.
10  *
11  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
12  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
13  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
14  *
15  * Sun RPC is provided with no support and without any obligation on the
16  * part of Sun Microsystems, Inc. to assist in its use, correction,
17  * modification or enhancement.
18  *
19  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
20  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
21  * OR ANY PART THEREOF.
22  *
23  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
24  * or profits or other special, indirect and consequential damages, even if
25  * Sun has been advised of the possibility of such damages.
26  *
27  * Sun Microsystems, Inc.
28  * 2550 Garcia Avenue
29  * Mountain View, California  94043
30  */
31 /*
32  * Copyright (c) 1986-1991 by Sun Microsystems Inc.
33  */
34 
35 /* #pragma ident	"@(#)rpc_generic.c	1.17	94/04/24 SMI" */
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
38 
39 /*
40  * rpc_generic.c, Miscl routines for RPC.
41  *
42  */
43 
44 #include "namespace.h"
45 #include "reentrant.h"
46 #include <sys/types.h>
47 #include <sys/param.h>
48 #include <sys/socket.h>
49 #include <sys/time.h>
50 #include <sys/un.h>
51 #include <sys/resource.h>
52 #include <netinet/in.h>
53 #include <arpa/inet.h>
54 #include <rpc/rpc.h>
55 #include <ctype.h>
56 #include <stddef.h>
57 #include <stdio.h>
58 #include <netdb.h>
59 #include <netconfig.h>
60 #include <stdlib.h>
61 #include <string.h>
62 #include <syslog.h>
63 #include <rpc/nettype.h>
64 #include "un-namespace.h"
65 #include "rpc_com.h"
66 #include "mt_misc.h"
67 
68 struct handle {
69 	NCONF_HANDLE *nhandle;
70 	int nflag;		/* Whether NETPATH or NETCONFIG */
71 	int nettype;
72 };
73 
74 static const struct _rpcnettype {
75 	const char *name;
76 	const int type;
77 } _rpctypelist[] = {
78 	{ "netpath", _RPC_NETPATH },
79 	{ "visible", _RPC_VISIBLE },
80 	{ "circuit_v", _RPC_CIRCUIT_V },
81 	{ "datagram_v", _RPC_DATAGRAM_V },
82 	{ "circuit_n", _RPC_CIRCUIT_N },
83 	{ "datagram_n", _RPC_DATAGRAM_N },
84 	{ "tcp", _RPC_TCP },
85 	{ "udp", _RPC_UDP },
86 	{ 0, _RPC_NONE }
87 };
88 
89 struct netid_af {
90 	const char	*netid;
91 	int		af;
92 	int		protocol;
93 };
94 
95 static const struct netid_af na_cvt[] = {
96 	{ "udp",  AF_INET,  IPPROTO_UDP },
97 	{ "tcp",  AF_INET,  IPPROTO_TCP },
98 #ifdef INET6
99 	{ "udp6", AF_INET6, IPPROTO_UDP },
100 	{ "tcp6", AF_INET6, IPPROTO_TCP },
101 #endif
102 	{ "local", AF_LOCAL, 0 }
103 };
104 
105 #if 0
106 static char *strlocase(char *);
107 #endif
108 static int getnettype(const char *);
109 
110 /*
111  * Cache the result of getrlimit(), so we don't have to do an
112  * expensive call every time.
113  */
114 int
115 __rpc_dtbsize()
116 {
117 	static int tbsize;
118 	struct rlimit rl;
119 
120 	if (tbsize) {
121 		return (tbsize);
122 	}
123 	if (getrlimit(RLIMIT_NOFILE, &rl) == 0) {
124 		return (tbsize = (int)rl.rlim_max);
125 	}
126 	/*
127 	 * Something wrong.  I'll try to save face by returning a
128 	 * pessimistic number.
129 	 */
130 	return (32);
131 }
132 
133 
134 /*
135  * Find the appropriate buffer size
136  */
137 u_int
138 /*ARGSUSED*/
139 __rpc_get_t_size(af, proto, size)
140 	int af, proto;
141 	int size;	/* Size requested */
142 {
143 	int maxsize, defsize;
144 
145 	maxsize = 256 * 1024;	/* XXX */
146 	switch (proto) {
147 	case IPPROTO_TCP:
148 		defsize = 64 * 1024;	/* XXX */
149 		break;
150 	case IPPROTO_UDP:
151 		defsize = UDPMSGSIZE;
152 		break;
153 	default:
154 		defsize = RPC_MAXDATASIZE;
155 		break;
156 	}
157 	if (size == 0)
158 		return defsize;
159 
160 	/* Check whether the value is within the upper max limit */
161 	return (size > maxsize ? (u_int)maxsize : (u_int)size);
162 }
163 
164 /*
165  * Find the appropriate address buffer size
166  */
167 u_int
168 __rpc_get_a_size(af)
169 	int af;
170 {
171 	switch (af) {
172 	case AF_INET:
173 		return sizeof (struct sockaddr_in);
174 #ifdef INET6
175 	case AF_INET6:
176 		return sizeof (struct sockaddr_in6);
177 #endif
178 	case AF_LOCAL:
179 		return sizeof (struct sockaddr_un);
180 	default:
181 		break;
182 	}
183 	return ((u_int)RPC_MAXADDRSIZE);
184 }
185 
186 #if 0
187 static char *
188 strlocase(p)
189 	char *p;
190 {
191 	char *t = p;
192 
193 	for (; *p; p++)
194 		if (isupper(*p))
195 			*p = tolower(*p);
196 	return (t);
197 }
198 #endif
199 
200 /*
201  * Returns the type of the network as defined in <rpc/nettype.h>
202  * If nettype is NULL, it defaults to NETPATH.
203  */
204 static int
205 getnettype(nettype)
206 	const char *nettype;
207 {
208 	int i;
209 
210 	if ((nettype == NULL) || (nettype[0] == 0)) {
211 		return (_RPC_NETPATH);	/* Default */
212 	}
213 
214 #if 0
215 	nettype = strlocase(nettype);
216 #endif
217 	for (i = 0; _rpctypelist[i].name; i++)
218 		if (strcasecmp(nettype, _rpctypelist[i].name) == 0) {
219 			return (_rpctypelist[i].type);
220 		}
221 	return (_rpctypelist[i].type);
222 }
223 
224 /*
225  * For the given nettype (tcp or udp only), return the first structure found.
226  * This should be freed by calling freenetconfigent()
227  */
228 struct netconfig *
229 __rpc_getconfip(nettype)
230 	const char *nettype;
231 {
232 	char *netid;
233 	char *netid_tcp = (char *) NULL;
234 	char *netid_udp = (char *) NULL;
235 	static char *netid_tcp_main;
236 	static char *netid_udp_main;
237 	struct netconfig *dummy;
238 	int main_thread;
239 	static thread_key_t tcp_key, udp_key;
240 
241 	if ((main_thread = thr_main())) {
242 		netid_udp = netid_udp_main;
243 		netid_tcp = netid_tcp_main;
244 	} else {
245 		if (tcp_key == 0) {
246 			mutex_lock(&tsd_lock);
247 			if (tcp_key == 0)
248 				thr_keycreate(&tcp_key, free);
249 			mutex_unlock(&tsd_lock);
250 		}
251 		netid_tcp = (char *)thr_getspecific(tcp_key);
252 		if (udp_key == 0) {
253 			mutex_lock(&tsd_lock);
254 			if (udp_key == 0)
255 				thr_keycreate(&udp_key, free);
256 			mutex_unlock(&tsd_lock);
257 		}
258 		netid_udp = (char *)thr_getspecific(udp_key);
259 	}
260 	if (!netid_udp && !netid_tcp) {
261 		struct netconfig *nconf;
262 		void *confighandle;
263 
264 		if (!(confighandle = setnetconfig())) {
265 			syslog (LOG_ERR, "rpc: failed to open " NETCONFIG);
266 			return (NULL);
267 		}
268 		while ((nconf = getnetconfig(confighandle)) != NULL) {
269 			if (strcmp(nconf->nc_protofmly, NC_INET) == 0) {
270 				if (strcmp(nconf->nc_proto, NC_TCP) == 0) {
271 					netid_tcp = strdup(nconf->nc_netid);
272 					if (main_thread)
273 						netid_tcp_main = netid_tcp;
274 					else
275 						thr_setspecific(tcp_key,
276 							(void *) netid_tcp);
277 				} else
278 				if (strcmp(nconf->nc_proto, NC_UDP) == 0) {
279 					netid_udp = strdup(nconf->nc_netid);
280 					if (main_thread)
281 						netid_udp_main = netid_udp;
282 					else
283 						thr_setspecific(udp_key,
284 						(void *) netid_udp);
285 				}
286 			}
287 		}
288 		endnetconfig(confighandle);
289 	}
290 	if (strcmp(nettype, "udp") == 0)
291 		netid = netid_udp;
292 	else if (strcmp(nettype, "tcp") == 0)
293 		netid = netid_tcp;
294 	else {
295 		return (NULL);
296 	}
297 	if ((netid == NULL) || (netid[0] == 0)) {
298 		return (NULL);
299 	}
300 	dummy = getnetconfigent(netid);
301 	return (dummy);
302 }
303 
304 /*
305  * Returns the type of the nettype, which should then be used with
306  * __rpc_getconf().
307  */
308 void *
309 __rpc_setconf(nettype)
310 	const char *nettype;
311 {
312 	struct handle *handle;
313 
314 	handle = (struct handle *) malloc(sizeof (struct handle));
315 	if (handle == NULL) {
316 		return (NULL);
317 	}
318 	switch (handle->nettype = getnettype(nettype)) {
319 	case _RPC_NETPATH:
320 	case _RPC_CIRCUIT_N:
321 	case _RPC_DATAGRAM_N:
322 		if (!(handle->nhandle = setnetpath()))
323 			goto failed;
324 		handle->nflag = TRUE;
325 		break;
326 	case _RPC_VISIBLE:
327 	case _RPC_CIRCUIT_V:
328 	case _RPC_DATAGRAM_V:
329 	case _RPC_TCP:
330 	case _RPC_UDP:
331 		if (!(handle->nhandle = setnetconfig())) {
332 		        syslog (LOG_ERR, "rpc: failed to open " NETCONFIG);
333 			goto failed;
334 		}
335 		handle->nflag = FALSE;
336 		break;
337 	default:
338 		goto failed;
339 	}
340 
341 	return (handle);
342 
343 failed:
344 	free(handle);
345 	return (NULL);
346 }
347 
348 /*
349  * Returns the next netconfig struct for the given "net" type.
350  * __rpc_setconf() should have been called previously.
351  */
352 struct netconfig *
353 __rpc_getconf(vhandle)
354 	void *vhandle;
355 {
356 	struct handle *handle;
357 	struct netconfig *nconf;
358 
359 	handle = (struct handle *)vhandle;
360 	if (handle == NULL) {
361 		return (NULL);
362 	}
363 	for (;;) {
364 		if (handle->nflag)
365 			nconf = getnetpath(handle->nhandle);
366 		else
367 			nconf = getnetconfig(handle->nhandle);
368 		if (nconf == NULL)
369 			break;
370 		if ((nconf->nc_semantics != NC_TPI_CLTS) &&
371 			(nconf->nc_semantics != NC_TPI_COTS) &&
372 			(nconf->nc_semantics != NC_TPI_COTS_ORD))
373 			continue;
374 		switch (handle->nettype) {
375 		case _RPC_VISIBLE:
376 			if (!(nconf->nc_flag & NC_VISIBLE))
377 				continue;
378 			/* FALLTHROUGH */
379 		case _RPC_NETPATH:	/* Be happy */
380 			break;
381 		case _RPC_CIRCUIT_V:
382 			if (!(nconf->nc_flag & NC_VISIBLE))
383 				continue;
384 			/* FALLTHROUGH */
385 		case _RPC_CIRCUIT_N:
386 			if ((nconf->nc_semantics != NC_TPI_COTS) &&
387 				(nconf->nc_semantics != NC_TPI_COTS_ORD))
388 				continue;
389 			break;
390 		case _RPC_DATAGRAM_V:
391 			if (!(nconf->nc_flag & NC_VISIBLE))
392 				continue;
393 			/* FALLTHROUGH */
394 		case _RPC_DATAGRAM_N:
395 			if (nconf->nc_semantics != NC_TPI_CLTS)
396 				continue;
397 			break;
398 		case _RPC_TCP:
399 			if (((nconf->nc_semantics != NC_TPI_COTS) &&
400 				(nconf->nc_semantics != NC_TPI_COTS_ORD)) ||
401 				(strcmp(nconf->nc_protofmly, NC_INET)
402 #ifdef INET6
403 				 && strcmp(nconf->nc_protofmly, NC_INET6))
404 #else
405 				)
406 #endif
407 				||
408 				strcmp(nconf->nc_proto, NC_TCP))
409 				continue;
410 			break;
411 		case _RPC_UDP:
412 			if ((nconf->nc_semantics != NC_TPI_CLTS) ||
413 				(strcmp(nconf->nc_protofmly, NC_INET)
414 #ifdef INET6
415 				&& strcmp(nconf->nc_protofmly, NC_INET6))
416 #else
417 				)
418 #endif
419 				||
420 				strcmp(nconf->nc_proto, NC_UDP))
421 				continue;
422 			break;
423 		}
424 		break;
425 	}
426 	return (nconf);
427 }
428 
429 void
430 __rpc_endconf(vhandle)
431 	void * vhandle;
432 {
433 	struct handle *handle;
434 
435 	handle = (struct handle *) vhandle;
436 	if (handle == NULL) {
437 		return;
438 	}
439 	if (handle->nflag) {
440 		endnetpath(handle->nhandle);
441 	} else {
442 		endnetconfig(handle->nhandle);
443 	}
444 	free(handle);
445 }
446 
447 /*
448  * Used to ping the NULL procedure for clnt handle.
449  * Returns NULL if fails, else a non-NULL pointer.
450  */
451 void *
452 rpc_nullproc(clnt)
453 	CLIENT *clnt;
454 {
455 	struct timeval TIMEOUT = {25, 0};
456 
457 	if (clnt_call(clnt, NULLPROC, (xdrproc_t) xdr_void, NULL,
458 		(xdrproc_t) xdr_void, NULL, TIMEOUT) != RPC_SUCCESS) {
459 		return (NULL);
460 	}
461 	return ((void *) clnt);
462 }
463 
464 /*
465  * Try all possible transports until
466  * one succeeds in finding the netconf for the given fd.
467  */
468 struct netconfig *
469 __rpcgettp(fd)
470 	int fd;
471 {
472 	const char *netid;
473 	struct __rpc_sockinfo si;
474 
475 	if (!__rpc_fd2sockinfo(fd, &si))
476 		return NULL;
477 
478 	if (!__rpc_sockinfo2netid(&si, &netid))
479 		return NULL;
480 
481 	/*LINTED const castaway*/
482 	return getnetconfigent((char *)netid);
483 }
484 
485 int
486 __rpc_fd2sockinfo(int fd, struct __rpc_sockinfo *sip)
487 {
488 	socklen_t len;
489 	int type, proto;
490 	struct sockaddr_storage ss;
491 
492 	len = sizeof ss;
493 	if (_getsockname(fd, (struct sockaddr *)(void *)&ss, &len) < 0)
494 		return 0;
495 	sip->si_alen = len;
496 
497 	len = sizeof type;
498 	if (_getsockopt(fd, SOL_SOCKET, SO_TYPE, &type, &len) < 0)
499 		return 0;
500 
501 	/* XXX */
502 	if (ss.ss_family != AF_LOCAL) {
503 		if (type == SOCK_STREAM)
504 			proto = IPPROTO_TCP;
505 		else if (type == SOCK_DGRAM)
506 			proto = IPPROTO_UDP;
507 		else
508 			return 0;
509 	} else
510 		proto = 0;
511 
512 	sip->si_af = ss.ss_family;
513 	sip->si_proto = proto;
514 	sip->si_socktype = type;
515 
516 	return 1;
517 }
518 
519 /*
520  * Linear search, but the number of entries is small.
521  */
522 int
523 __rpc_nconf2sockinfo(const struct netconfig *nconf, struct __rpc_sockinfo *sip)
524 {
525 	int i;
526 
527 	for (i = 0; i < (sizeof na_cvt) / (sizeof (struct netid_af)); i++)
528 		if (strcmp(na_cvt[i].netid, nconf->nc_netid) == 0 || (
529 		    strcmp(nconf->nc_netid, "unix") == 0 &&
530 		    strcmp(na_cvt[i].netid, "local") == 0)) {
531 			sip->si_af = na_cvt[i].af;
532 			sip->si_proto = na_cvt[i].protocol;
533 			sip->si_socktype =
534 			    __rpc_seman2socktype((int)nconf->nc_semantics);
535 			if (sip->si_socktype == -1)
536 				return 0;
537 			sip->si_alen = __rpc_get_a_size(sip->si_af);
538 			return 1;
539 		}
540 
541 	return 0;
542 }
543 
544 int
545 __rpc_nconf2fd(const struct netconfig *nconf)
546 {
547 	struct __rpc_sockinfo si;
548 
549 	if (!__rpc_nconf2sockinfo(nconf, &si))
550 		return 0;
551 
552 	return _socket(si.si_af, si.si_socktype, si.si_proto);
553 }
554 
555 int
556 __rpc_sockinfo2netid(struct __rpc_sockinfo *sip, const char **netid)
557 {
558 	int i;
559 	struct netconfig *nconf;
560 
561 	nconf = getnetconfigent("local");
562 
563 	for (i = 0; i < (sizeof na_cvt) / (sizeof (struct netid_af)); i++) {
564 		if (na_cvt[i].af == sip->si_af &&
565 		    na_cvt[i].protocol == sip->si_proto) {
566 			if (strcmp(na_cvt[i].netid, "local") == 0 && nconf == NULL) {
567 				if (netid)
568 					*netid = "unix";
569 			} else {
570 				if (netid)
571 					*netid = na_cvt[i].netid;
572 			}
573 			if (nconf != NULL)
574 				freenetconfigent(nconf);
575 			return 1;
576 		}
577 	}
578 	if (nconf != NULL)
579 		freenetconfigent(nconf);
580 
581 	return 0;
582 }
583 
584 char *
585 taddr2uaddr(const struct netconfig *nconf, const struct netbuf *nbuf)
586 {
587 	struct __rpc_sockinfo si;
588 
589 	if (!__rpc_nconf2sockinfo(nconf, &si))
590 		return NULL;
591 	return __rpc_taddr2uaddr_af(si.si_af, nbuf);
592 }
593 
594 struct netbuf *
595 uaddr2taddr(const struct netconfig *nconf, const char *uaddr)
596 {
597 	struct __rpc_sockinfo si;
598 
599 	if (!__rpc_nconf2sockinfo(nconf, &si))
600 		return NULL;
601 	return __rpc_uaddr2taddr_af(si.si_af, uaddr);
602 }
603 
604 char *
605 __rpc_taddr2uaddr_af(int af, const struct netbuf *nbuf)
606 {
607 	char *ret;
608 	struct sockaddr_in *sin;
609 	struct sockaddr_un *sun;
610 	char namebuf[INET_ADDRSTRLEN];
611 #ifdef INET6
612 	struct sockaddr_in6 *sin6;
613 	char namebuf6[INET6_ADDRSTRLEN];
614 #endif
615 	u_int16_t port;
616 
617 	switch (af) {
618 	case AF_INET:
619 		sin = nbuf->buf;
620 		if (inet_ntop(af, &sin->sin_addr, namebuf, sizeof namebuf)
621 		    == NULL)
622 			return NULL;
623 		port = ntohs(sin->sin_port);
624 		if (asprintf(&ret, "%s.%u.%u", namebuf, ((u_int32_t)port) >> 8,
625 		    port & 0xff) < 0)
626 			return NULL;
627 		break;
628 #ifdef INET6
629 	case AF_INET6:
630 		sin6 = nbuf->buf;
631 		if (inet_ntop(af, &sin6->sin6_addr, namebuf6, sizeof namebuf6)
632 		    == NULL)
633 			return NULL;
634 		port = ntohs(sin6->sin6_port);
635 		if (asprintf(&ret, "%s.%u.%u", namebuf6, ((u_int32_t)port) >> 8,
636 		    port & 0xff) < 0)
637 			return NULL;
638 		break;
639 #endif
640 	case AF_LOCAL:
641 		sun = nbuf->buf;
642 		if (asprintf(&ret, "%.*s", (int)(sun->sun_len -
643 		    offsetof(struct sockaddr_un, sun_path)),
644 		    sun->sun_path) < 0)
645 			return (NULL);
646 		break;
647 	default:
648 		return NULL;
649 	}
650 
651 	return ret;
652 }
653 
654 struct netbuf *
655 __rpc_uaddr2taddr_af(int af, const char *uaddr)
656 {
657 	struct netbuf *ret = NULL;
658 	char *addrstr, *p;
659 	unsigned port, portlo, porthi;
660 	struct sockaddr_in *sin;
661 #ifdef INET6
662 	struct sockaddr_in6 *sin6;
663 #endif
664 	struct sockaddr_un *sun;
665 
666 	port = 0;
667 	sin = NULL;
668 	addrstr = strdup(uaddr);
669 	if (addrstr == NULL)
670 		return NULL;
671 
672 	/*
673 	 * AF_LOCAL addresses are expected to be absolute
674 	 * pathnames, anything else will be AF_INET or AF_INET6.
675 	 */
676 	if (*addrstr != '/') {
677 		p = strrchr(addrstr, '.');
678 		if (p == NULL)
679 			goto out;
680 		portlo = (unsigned)atoi(p + 1);
681 		*p = '\0';
682 
683 		p = strrchr(addrstr, '.');
684 		if (p == NULL)
685 			goto out;
686 		porthi = (unsigned)atoi(p + 1);
687 		*p = '\0';
688 		port = (porthi << 8) | portlo;
689 	}
690 
691 	ret = (struct netbuf *)malloc(sizeof *ret);
692 	if (ret == NULL)
693 		goto out;
694 
695 	switch (af) {
696 	case AF_INET:
697 		sin = (struct sockaddr_in *)malloc(sizeof *sin);
698 		if (sin == NULL)
699 			goto out;
700 		memset(sin, 0, sizeof *sin);
701 		sin->sin_family = AF_INET;
702 		sin->sin_port = htons(port);
703 		if (inet_pton(AF_INET, addrstr, &sin->sin_addr) <= 0) {
704 			free(sin);
705 			free(ret);
706 			ret = NULL;
707 			goto out;
708 		}
709 		sin->sin_len = ret->maxlen = ret->len = sizeof *sin;
710 		ret->buf = sin;
711 		break;
712 #ifdef INET6
713 	case AF_INET6:
714 		sin6 = (struct sockaddr_in6 *)malloc(sizeof *sin6);
715 		if (sin6 == NULL)
716 			goto out;
717 		memset(sin6, 0, sizeof *sin6);
718 		sin6->sin6_family = AF_INET6;
719 		sin6->sin6_port = htons(port);
720 		if (inet_pton(AF_INET6, addrstr, &sin6->sin6_addr) <= 0) {
721 			free(sin6);
722 			free(ret);
723 			ret = NULL;
724 			goto out;
725 		}
726 		sin6->sin6_len = ret->maxlen = ret->len = sizeof *sin6;
727 		ret->buf = sin6;
728 		break;
729 #endif
730 	case AF_LOCAL:
731 		sun = (struct sockaddr_un *)malloc(sizeof *sun);
732 		if (sun == NULL)
733 			goto out;
734 		memset(sun, 0, sizeof *sun);
735 		sun->sun_family = AF_LOCAL;
736 		strncpy(sun->sun_path, addrstr, sizeof(sun->sun_path) - 1);
737 		ret->len = ret->maxlen = sun->sun_len = SUN_LEN(sun);
738 		ret->buf = sun;
739 		break;
740 	default:
741 		break;
742 	}
743 out:
744 	free(addrstr);
745 	return ret;
746 }
747 
748 int
749 __rpc_seman2socktype(int semantics)
750 {
751 	switch (semantics) {
752 	case NC_TPI_CLTS:
753 		return SOCK_DGRAM;
754 	case NC_TPI_COTS_ORD:
755 		return SOCK_STREAM;
756 	case NC_TPI_RAW:
757 		return SOCK_RAW;
758 	default:
759 		break;
760 	}
761 
762 	return -1;
763 }
764 
765 int
766 __rpc_socktype2seman(int socktype)
767 {
768 	switch (socktype) {
769 	case SOCK_DGRAM:
770 		return NC_TPI_CLTS;
771 	case SOCK_STREAM:
772 		return NC_TPI_COTS_ORD;
773 	case SOCK_RAW:
774 		return NC_TPI_RAW;
775 	default:
776 		break;
777 	}
778 
779 	return -1;
780 }
781 
782 /*
783  * XXXX - IPv6 scope IDs can't be handled in universal addresses.
784  * Here, we compare the original server address to that of the RPC
785  * service we just received back from a call to rpcbind on the remote
786  * machine. If they are both "link local" or "site local", copy
787  * the scope id of the server address over to the service address.
788  */
789 int
790 __rpc_fixup_addr(struct netbuf *new, const struct netbuf *svc)
791 {
792 #ifdef INET6
793 	struct sockaddr *sa_new, *sa_svc;
794 	struct sockaddr_in6 *sin6_new, *sin6_svc;
795 
796 	sa_svc = (struct sockaddr *)svc->buf;
797 	sa_new = (struct sockaddr *)new->buf;
798 
799 	if (sa_new->sa_family == sa_svc->sa_family &&
800 	    sa_new->sa_family == AF_INET6) {
801 		sin6_new = (struct sockaddr_in6 *)new->buf;
802 		sin6_svc = (struct sockaddr_in6 *)svc->buf;
803 
804 		if ((IN6_IS_ADDR_LINKLOCAL(&sin6_new->sin6_addr) &&
805 		     IN6_IS_ADDR_LINKLOCAL(&sin6_svc->sin6_addr)) ||
806 		    (IN6_IS_ADDR_SITELOCAL(&sin6_new->sin6_addr) &&
807 		     IN6_IS_ADDR_SITELOCAL(&sin6_svc->sin6_addr))) {
808 			sin6_new->sin6_scope_id = sin6_svc->sin6_scope_id;
809 		}
810 	}
811 #endif
812 	return 1;
813 }
814 
815 int
816 __rpc_sockisbound(int fd)
817 {
818 	struct sockaddr_storage ss;
819 	socklen_t slen;
820 
821 	slen = sizeof (struct sockaddr_storage);
822 	if (_getsockname(fd, (struct sockaddr *)(void *)&ss, &slen) < 0)
823 		return 0;
824 
825 	switch (ss.ss_family) {
826 		case AF_INET:
827 			return (((struct sockaddr_in *)
828 			    (void *)&ss)->sin_port != 0);
829 #ifdef INET6
830 		case AF_INET6:
831 			return (((struct sockaddr_in6 *)
832 			    (void *)&ss)->sin6_port != 0);
833 #endif
834 		case AF_LOCAL:
835 			/* XXX check this */
836 			return (((struct sockaddr_un *)
837 			    (void *)&ss)->sun_path[0] != '\0');
838 		default:
839 			break;
840 	}
841 
842 	return 0;
843 }
844