rpc_generic.c revision 218757 
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: head/sys/rpc/rpc_generic.c 218757 2011-02-16 21:29:13Z bz $");
38
39/*
40 * rpc_generic.c, Miscl routines for RPC.
41 *
42 */
43
44#include "opt_inet6.h"
45
46#include <sys/param.h>
47#include <sys/kernel.h>
48#include <sys/malloc.h>
49#include <sys/mbuf.h>
50#include <sys/module.h>
51#include <sys/proc.h>
52#include <sys/protosw.h>
53#include <sys/sbuf.h>
54#include <sys/systm.h>
55#include <sys/socket.h>
56#include <sys/socketvar.h>
57#include <sys/syslog.h>
58
59#include <net/vnet.h>
60
61#include <rpc/rpc.h>
62#include <rpc/nettype.h>
63
64#include <rpc/rpc_com.h>
65
66extern	u_long sb_max_adj;	/* not defined in socketvar.h */
67
68#if __FreeBSD_version < 700000
69#define strrchr rindex
70#endif
71
72struct handle {
73	NCONF_HANDLE *nhandle;
74	int nflag;		/* Whether NETPATH or NETCONFIG */
75	int nettype;
76};
77
78static const struct _rpcnettype {
79	const char *name;
80	const int type;
81} _rpctypelist[] = {
82	{ "netpath", _RPC_NETPATH },
83	{ "visible", _RPC_VISIBLE },
84	{ "circuit_v", _RPC_CIRCUIT_V },
85	{ "datagram_v", _RPC_DATAGRAM_V },
86	{ "circuit_n", _RPC_CIRCUIT_N },
87	{ "datagram_n", _RPC_DATAGRAM_N },
88	{ "tcp", _RPC_TCP },
89	{ "udp", _RPC_UDP },
90	{ 0, _RPC_NONE }
91};
92
93struct netid_af {
94	const char	*netid;
95	int		af;
96	int		protocol;
97};
98
99static const struct netid_af na_cvt[] = {
100	{ "udp",  AF_INET,  IPPROTO_UDP },
101	{ "tcp",  AF_INET,  IPPROTO_TCP },
102#ifdef INET6
103	{ "udp6", AF_INET6, IPPROTO_UDP },
104	{ "tcp6", AF_INET6, IPPROTO_TCP },
105#endif
106	{ "local", AF_LOCAL, 0 }
107};
108
109struct rpc_createerr rpc_createerr;
110
111/*
112 * Find the appropriate buffer size
113 */
114u_int
115/*ARGSUSED*/
116__rpc_get_t_size(int af, int proto, int size)
117{
118	int defsize;
119
120	switch (proto) {
121	case IPPROTO_TCP:
122		defsize = 64 * 1024;	/* XXX */
123		break;
124	case IPPROTO_UDP:
125		defsize = UDPMSGSIZE;
126		break;
127	default:
128		defsize = RPC_MAXDATASIZE;
129		break;
130	}
131	if (size == 0)
132		return defsize;
133
134	/* Check whether the value is within the upper max limit */
135	return (size > sb_max_adj ? (u_int)sb_max_adj : (u_int)size);
136}
137
138/*
139 * Find the appropriate address buffer size
140 */
141u_int
142__rpc_get_a_size(af)
143	int af;
144{
145	switch (af) {
146	case AF_INET:
147		return sizeof (struct sockaddr_in);
148#ifdef INET6
149	case AF_INET6:
150		return sizeof (struct sockaddr_in6);
151#endif
152	case AF_LOCAL:
153		return sizeof (struct sockaddr_un);
154	default:
155		break;
156	}
157	return ((u_int)RPC_MAXADDRSIZE);
158}
159
160#if 0
161
162/*
163 * Used to ping the NULL procedure for clnt handle.
164 * Returns NULL if fails, else a non-NULL pointer.
165 */
166void *
167rpc_nullproc(clnt)
168	CLIENT *clnt;
169{
170	struct timeval TIMEOUT = {25, 0};
171
172	if (clnt_call(clnt, NULLPROC, (xdrproc_t) xdr_void, NULL,
173		(xdrproc_t) xdr_void, NULL, TIMEOUT) != RPC_SUCCESS) {
174		return (NULL);
175	}
176	return ((void *) clnt);
177}
178
179#endif
180
181int
182__rpc_socket2sockinfo(struct socket *so, struct __rpc_sockinfo *sip)
183{
184	int type, proto;
185	struct sockaddr *sa;
186	sa_family_t family;
187	struct sockopt opt;
188	int error;
189
190	CURVNET_SET(so->so_vnet);
191	error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
192	CURVNET_RESTORE();
193	if (error)
194		return 0;
195
196	sip->si_alen = sa->sa_len;
197	family = sa->sa_family;
198	free(sa, M_SONAME);
199
200	opt.sopt_dir = SOPT_GET;
201	opt.sopt_level = SOL_SOCKET;
202	opt.sopt_name = SO_TYPE;
203	opt.sopt_val = &type;
204	opt.sopt_valsize = sizeof type;
205	opt.sopt_td = NULL;
206	error = sogetopt(so, &opt);
207	if (error)
208		return 0;
209
210	/* XXX */
211	if (family != AF_LOCAL) {
212		if (type == SOCK_STREAM)
213			proto = IPPROTO_TCP;
214		else if (type == SOCK_DGRAM)
215			proto = IPPROTO_UDP;
216		else
217			return 0;
218	} else
219		proto = 0;
220
221	sip->si_af = family;
222	sip->si_proto = proto;
223	sip->si_socktype = type;
224
225	return 1;
226}
227
228/*
229 * Linear search, but the number of entries is small.
230 */
231int
232__rpc_nconf2sockinfo(const struct netconfig *nconf, struct __rpc_sockinfo *sip)
233{
234	int i;
235
236	for (i = 0; i < (sizeof na_cvt) / (sizeof (struct netid_af)); i++)
237		if (strcmp(na_cvt[i].netid, nconf->nc_netid) == 0 || (
238		    strcmp(nconf->nc_netid, "unix") == 0 &&
239		    strcmp(na_cvt[i].netid, "local") == 0)) {
240			sip->si_af = na_cvt[i].af;
241			sip->si_proto = na_cvt[i].protocol;
242			sip->si_socktype =
243			    __rpc_seman2socktype((int)nconf->nc_semantics);
244			if (sip->si_socktype == -1)
245				return 0;
246			sip->si_alen = __rpc_get_a_size(sip->si_af);
247			return 1;
248		}
249
250	return 0;
251}
252
253struct socket *
254__rpc_nconf2socket(const struct netconfig *nconf)
255{
256	struct __rpc_sockinfo si;
257	struct socket *so;
258	int error;
259
260	if (!__rpc_nconf2sockinfo(nconf, &si))
261		return 0;
262
263	so = NULL;
264	error =  socreate(si.si_af, &so, si.si_socktype, si.si_proto,
265	    curthread->td_ucred, curthread);
266
267	if (error)
268		return NULL;
269	else
270		return so;
271}
272
273char *
274taddr2uaddr(const struct netconfig *nconf, const struct netbuf *nbuf)
275{
276	struct __rpc_sockinfo si;
277
278	if (!__rpc_nconf2sockinfo(nconf, &si))
279		return NULL;
280	return __rpc_taddr2uaddr_af(si.si_af, nbuf);
281}
282
283struct netbuf *
284uaddr2taddr(const struct netconfig *nconf, const char *uaddr)
285{
286	struct __rpc_sockinfo si;
287
288	if (!__rpc_nconf2sockinfo(nconf, &si))
289		return NULL;
290	return __rpc_uaddr2taddr_af(si.si_af, uaddr);
291}
292
293char *
294__rpc_taddr2uaddr_af(int af, const struct netbuf *nbuf)
295{
296	char *ret;
297	struct sbuf sb;
298	struct sockaddr_in *sin;
299	struct sockaddr_un *sun;
300	char namebuf[INET_ADDRSTRLEN];
301#ifdef INET6
302	struct sockaddr_in6 *sin6;
303	char namebuf6[INET6_ADDRSTRLEN];
304#endif
305	u_int16_t port;
306
307	sbuf_new(&sb, NULL, 0, SBUF_AUTOEXTEND);
308
309	switch (af) {
310	case AF_INET:
311		sin = nbuf->buf;
312		if (inet_ntop(af, &sin->sin_addr, namebuf, sizeof namebuf)
313		    == NULL)
314			return NULL;
315		port = ntohs(sin->sin_port);
316		if (sbuf_printf(&sb, "%s.%u.%u", namebuf,
317			((uint32_t)port) >> 8,
318			port & 0xff) < 0)
319			return NULL;
320		break;
321#ifdef INET6
322	case AF_INET6:
323		sin6 = nbuf->buf;
324		if (inet_ntop(af, &sin6->sin6_addr, namebuf6, sizeof namebuf6)
325		    == NULL)
326			return NULL;
327		port = ntohs(sin6->sin6_port);
328		if (sbuf_printf(&sb, "%s.%u.%u", namebuf6,
329			((uint32_t)port) >> 8,
330			port & 0xff) < 0)
331			return NULL;
332		break;
333#endif
334	case AF_LOCAL:
335		sun = nbuf->buf;
336		if (sbuf_printf(&sb, "%.*s", (int)(sun->sun_len -
337			    offsetof(struct sockaddr_un, sun_path)),
338			sun->sun_path) < 0)
339			return (NULL);
340		break;
341	default:
342		return NULL;
343	}
344
345	sbuf_finish(&sb);
346	ret = strdup(sbuf_data(&sb), M_RPC);
347	sbuf_delete(&sb);
348
349	return ret;
350}
351
352struct netbuf *
353__rpc_uaddr2taddr_af(int af, const char *uaddr)
354{
355	struct netbuf *ret = NULL;
356	char *addrstr, *p;
357	unsigned port, portlo, porthi;
358	struct sockaddr_in *sin;
359#ifdef INET6
360	struct sockaddr_in6 *sin6;
361#endif
362	struct sockaddr_un *sun;
363
364	port = 0;
365	sin = NULL;
366	addrstr = strdup(uaddr, M_RPC);
367	if (addrstr == NULL)
368		return NULL;
369
370	/*
371	 * AF_LOCAL addresses are expected to be absolute
372	 * pathnames, anything else will be AF_INET or AF_INET6.
373	 */
374	if (*addrstr != '/') {
375		p = strrchr(addrstr, '.');
376		if (p == NULL)
377			goto out;
378		portlo = (unsigned)strtol(p + 1, NULL, 10);
379		*p = '\0';
380
381		p = strrchr(addrstr, '.');
382		if (p == NULL)
383			goto out;
384		porthi = (unsigned)strtol(p + 1, NULL, 10);
385		*p = '\0';
386		port = (porthi << 8) | portlo;
387	}
388
389	ret = (struct netbuf *)malloc(sizeof *ret, M_RPC, M_WAITOK);
390	if (ret == NULL)
391		goto out;
392
393	switch (af) {
394	case AF_INET:
395		sin = (struct sockaddr_in *)malloc(sizeof *sin, M_RPC,
396		    M_WAITOK);
397		if (sin == NULL)
398			goto out;
399		memset(sin, 0, sizeof *sin);
400		sin->sin_family = AF_INET;
401		sin->sin_port = htons(port);
402		if (inet_pton(AF_INET, addrstr, &sin->sin_addr) <= 0) {
403			free(sin, M_RPC);
404			free(ret, M_RPC);
405			ret = NULL;
406			goto out;
407		}
408		sin->sin_len = ret->maxlen = ret->len = sizeof *sin;
409		ret->buf = sin;
410		break;
411#ifdef INET6
412	case AF_INET6:
413		sin6 = (struct sockaddr_in6 *)malloc(sizeof *sin6, M_RPC,
414		    M_WAITOK);
415		if (sin6 == NULL)
416			goto out;
417		memset(sin6, 0, sizeof *sin6);
418		sin6->sin6_family = AF_INET6;
419		sin6->sin6_port = htons(port);
420		if (inet_pton(AF_INET6, addrstr, &sin6->sin6_addr) <= 0) {
421			free(sin6, M_RPC);
422			free(ret, M_RPC);
423			ret = NULL;
424			goto out;
425		}
426		sin6->sin6_len = ret->maxlen = ret->len = sizeof *sin6;
427		ret->buf = sin6;
428		break;
429#endif
430	case AF_LOCAL:
431		sun = (struct sockaddr_un *)malloc(sizeof *sun, M_RPC,
432		    M_WAITOK);
433		if (sun == NULL)
434			goto out;
435		memset(sun, 0, sizeof *sun);
436		sun->sun_family = AF_LOCAL;
437		strncpy(sun->sun_path, addrstr, sizeof(sun->sun_path) - 1);
438		ret->len = ret->maxlen = sun->sun_len = SUN_LEN(sun);
439		ret->buf = sun;
440		break;
441	default:
442		break;
443	}
444out:
445	free(addrstr, M_RPC);
446	return ret;
447}
448
449int
450__rpc_seman2socktype(int semantics)
451{
452	switch (semantics) {
453	case NC_TPI_CLTS:
454		return SOCK_DGRAM;
455	case NC_TPI_COTS_ORD:
456		return SOCK_STREAM;
457	case NC_TPI_RAW:
458		return SOCK_RAW;
459	default:
460		break;
461	}
462
463	return -1;
464}
465
466int
467__rpc_socktype2seman(int socktype)
468{
469	switch (socktype) {
470	case SOCK_DGRAM:
471		return NC_TPI_CLTS;
472	case SOCK_STREAM:
473		return NC_TPI_COTS_ORD;
474	case SOCK_RAW:
475		return NC_TPI_RAW;
476	default:
477		break;
478	}
479
480	return -1;
481}
482
483/*
484 * Returns the type of the network as defined in <rpc/nettype.h>
485 * If nettype is NULL, it defaults to NETPATH.
486 */
487static int
488getnettype(const char *nettype)
489{
490	int i;
491
492	if ((nettype == NULL) || (nettype[0] == 0)) {
493		return (_RPC_NETPATH);	/* Default */
494	}
495
496#if 0
497	nettype = strlocase(nettype);
498#endif
499	for (i = 0; _rpctypelist[i].name; i++)
500		if (strcasecmp(nettype, _rpctypelist[i].name) == 0) {
501			return (_rpctypelist[i].type);
502		}
503	return (_rpctypelist[i].type);
504}
505
506/*
507 * For the given nettype (tcp or udp only), return the first structure found.
508 * This should be freed by calling freenetconfigent()
509 */
510struct netconfig *
511__rpc_getconfip(const char *nettype)
512{
513	char *netid;
514	static char *netid_tcp = (char *) NULL;
515	static char *netid_udp = (char *) NULL;
516	struct netconfig *dummy;
517
518	if (!netid_udp && !netid_tcp) {
519		struct netconfig *nconf;
520		void *confighandle;
521
522		if (!(confighandle = setnetconfig())) {
523			log(LOG_ERR, "rpc: failed to open " NETCONFIG);
524			return (NULL);
525		}
526		while ((nconf = getnetconfig(confighandle)) != NULL) {
527			if (strcmp(nconf->nc_protofmly, NC_INET) == 0) {
528				if (strcmp(nconf->nc_proto, NC_TCP) == 0) {
529					netid_tcp = strdup(nconf->nc_netid,
530					    M_RPC);
531				} else
532				if (strcmp(nconf->nc_proto, NC_UDP) == 0) {
533					netid_udp = strdup(nconf->nc_netid,
534					    M_RPC);
535				}
536			}
537		}
538		endnetconfig(confighandle);
539	}
540	if (strcmp(nettype, "udp") == 0)
541		netid = netid_udp;
542	else if (strcmp(nettype, "tcp") == 0)
543		netid = netid_tcp;
544	else {
545		return (NULL);
546	}
547	if ((netid == NULL) || (netid[0] == 0)) {
548		return (NULL);
549	}
550	dummy = getnetconfigent(netid);
551	return (dummy);
552}
553
554/*
555 * Returns the type of the nettype, which should then be used with
556 * __rpc_getconf().
557 *
558 * For simplicity in the kernel, we don't support the NETPATH
559 * environment variable. We behave as userland would then NETPATH is
560 * unset, i.e. iterate over all visible entries in netconfig.
561 */
562void *
563__rpc_setconf(nettype)
564	const char *nettype;
565{
566	struct handle *handle;
567
568	handle = (struct handle *) malloc(sizeof (struct handle),
569	    M_RPC, M_WAITOK);
570	switch (handle->nettype = getnettype(nettype)) {
571	case _RPC_NETPATH:
572	case _RPC_CIRCUIT_N:
573	case _RPC_DATAGRAM_N:
574		if (!(handle->nhandle = setnetconfig()))
575			goto failed;
576		handle->nflag = TRUE;
577		break;
578	case _RPC_VISIBLE:
579	case _RPC_CIRCUIT_V:
580	case _RPC_DATAGRAM_V:
581	case _RPC_TCP:
582	case _RPC_UDP:
583		if (!(handle->nhandle = setnetconfig())) {
584		        log(LOG_ERR, "rpc: failed to open " NETCONFIG);
585			goto failed;
586		}
587		handle->nflag = FALSE;
588		break;
589	default:
590		goto failed;
591	}
592
593	return (handle);
594
595failed:
596	free(handle, M_RPC);
597	return (NULL);
598}
599
600/*
601 * Returns the next netconfig struct for the given "net" type.
602 * __rpc_setconf() should have been called previously.
603 */
604struct netconfig *
605__rpc_getconf(void *vhandle)
606{
607	struct handle *handle;
608	struct netconfig *nconf;
609
610	handle = (struct handle *)vhandle;
611	if (handle == NULL) {
612		return (NULL);
613	}
614	for (;;) {
615		if (handle->nflag) {
616			nconf = getnetconfig(handle->nhandle);
617			if (nconf && !(nconf->nc_flag & NC_VISIBLE))
618				continue;
619		} else {
620			nconf = getnetconfig(handle->nhandle);
621		}
622		if (nconf == NULL)
623			break;
624		if ((nconf->nc_semantics != NC_TPI_CLTS) &&
625			(nconf->nc_semantics != NC_TPI_COTS) &&
626			(nconf->nc_semantics != NC_TPI_COTS_ORD))
627			continue;
628		switch (handle->nettype) {
629		case _RPC_VISIBLE:
630			if (!(nconf->nc_flag & NC_VISIBLE))
631				continue;
632			/* FALLTHROUGH */
633		case _RPC_NETPATH:	/* Be happy */
634			break;
635		case _RPC_CIRCUIT_V:
636			if (!(nconf->nc_flag & NC_VISIBLE))
637				continue;
638			/* FALLTHROUGH */
639		case _RPC_CIRCUIT_N:
640			if ((nconf->nc_semantics != NC_TPI_COTS) &&
641				(nconf->nc_semantics != NC_TPI_COTS_ORD))
642				continue;
643			break;
644		case _RPC_DATAGRAM_V:
645			if (!(nconf->nc_flag & NC_VISIBLE))
646				continue;
647			/* FALLTHROUGH */
648		case _RPC_DATAGRAM_N:
649			if (nconf->nc_semantics != NC_TPI_CLTS)
650				continue;
651			break;
652		case _RPC_TCP:
653			if (((nconf->nc_semantics != NC_TPI_COTS) &&
654				(nconf->nc_semantics != NC_TPI_COTS_ORD)) ||
655				(strcmp(nconf->nc_protofmly, NC_INET)
656#ifdef INET6
657				 && strcmp(nconf->nc_protofmly, NC_INET6))
658#else
659				)
660#endif
661				||
662				strcmp(nconf->nc_proto, NC_TCP))
663				continue;
664			break;
665		case _RPC_UDP:
666			if ((nconf->nc_semantics != NC_TPI_CLTS) ||
667				(strcmp(nconf->nc_protofmly, NC_INET)
668#ifdef INET6
669				&& strcmp(nconf->nc_protofmly, NC_INET6))
670#else
671				)
672#endif
673				||
674				strcmp(nconf->nc_proto, NC_UDP))
675				continue;
676			break;
677		}
678		break;
679	}
680	return (nconf);
681}
682
683void
684__rpc_endconf(vhandle)
685	void * vhandle;
686{
687	struct handle *handle;
688
689	handle = (struct handle *) vhandle;
690	if (handle == NULL) {
691		return;
692	}
693	endnetconfig(handle->nhandle);
694	free(handle, M_RPC);
695}
696
697int
698__rpc_sockisbound(struct socket *so)
699{
700	struct sockaddr *sa;
701	int error, bound;
702
703	error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
704	if (error)
705		return (0);
706
707	switch (sa->sa_family) {
708		case AF_INET:
709			bound = (((struct sockaddr_in *) sa)->sin_port != 0);
710			break;
711#ifdef INET6
712		case AF_INET6:
713			bound = (((struct sockaddr_in6 *) sa)->sin6_port != 0);
714			break;
715#endif
716		case AF_LOCAL:
717			/* XXX check this */
718			bound = (((struct sockaddr_un *) sa)->sun_path[0] != '\0');
719			break;
720		default:
721			bound = FALSE;
722			break;
723	}
724
725	free(sa, M_SONAME);
726
727	return bound;
728}
729
730/*
731 * Implement XDR-style API for RPC call.
732 */
733enum clnt_stat
734clnt_call_private(
735	CLIENT		*cl,		/* client handle */
736	struct rpc_callextra *ext,	/* call metadata */
737	rpcproc_t	proc,		/* procedure number */
738	xdrproc_t	xargs,		/* xdr routine for args */
739	void		*argsp,		/* pointer to args */
740	xdrproc_t	xresults,	/* xdr routine for results */
741	void		*resultsp,	/* pointer to results */
742	struct timeval	utimeout)	/* seconds to wait before giving up */
743{
744	XDR xdrs;
745	struct mbuf *mreq;
746	struct mbuf *mrep;
747	enum clnt_stat stat;
748
749	MGET(mreq, M_WAIT, MT_DATA);
750	MCLGET(mreq, M_WAIT);
751	mreq->m_len = 0;
752
753	xdrmbuf_create(&xdrs, mreq, XDR_ENCODE);
754	if (!xargs(&xdrs, argsp)) {
755		m_freem(mreq);
756		return (RPC_CANTENCODEARGS);
757	}
758	XDR_DESTROY(&xdrs);
759
760	stat = CLNT_CALL_MBUF(cl, ext, proc, mreq, &mrep, utimeout);
761	m_freem(mreq);
762
763	if (stat == RPC_SUCCESS) {
764		xdrmbuf_create(&xdrs, mrep, XDR_DECODE);
765		if (!xresults(&xdrs, resultsp)) {
766			XDR_DESTROY(&xdrs);
767			return (RPC_CANTDECODERES);
768		}
769		XDR_DESTROY(&xdrs);
770	}
771
772	return (stat);
773}
774
775/*
776 * Bind a socket to a privileged IP port
777 */
778int
779bindresvport(struct socket *so, struct sockaddr *sa)
780{
781	int old, error, af;
782	bool_t freesa = FALSE;
783	struct sockaddr_in *sin;
784#ifdef INET6
785	struct sockaddr_in6 *sin6;
786#endif
787	struct sockopt opt;
788	int proto, portrange, portlow;
789	u_int16_t *portp;
790	socklen_t salen;
791
792	if (sa == NULL) {
793		error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
794		if (error)
795			return (error);
796		freesa = TRUE;
797		af = sa->sa_family;
798		salen = sa->sa_len;
799		memset(sa, 0, sa->sa_len);
800	} else {
801		af = sa->sa_family;
802		salen = sa->sa_len;
803	}
804
805	switch (af) {
806	case AF_INET:
807		proto = IPPROTO_IP;
808		portrange = IP_PORTRANGE;
809		portlow = IP_PORTRANGE_LOW;
810		sin = (struct sockaddr_in *)sa;
811		portp = &sin->sin_port;
812		break;
813#ifdef INET6
814	case AF_INET6:
815		proto = IPPROTO_IPV6;
816		portrange = IPV6_PORTRANGE;
817		portlow = IPV6_PORTRANGE_LOW;
818		sin6 = (struct sockaddr_in6 *)sa;
819		portp = &sin6->sin6_port;
820		break;
821#endif
822	default:
823		return (EPFNOSUPPORT);
824	}
825
826	sa->sa_family = af;
827	sa->sa_len = salen;
828
829	if (*portp == 0) {
830		bzero(&opt, sizeof(opt));
831		opt.sopt_dir = SOPT_GET;
832		opt.sopt_level = proto;
833		opt.sopt_name = portrange;
834		opt.sopt_val = &old;
835		opt.sopt_valsize = sizeof(old);
836		error = sogetopt(so, &opt);
837		if (error) {
838			goto out;
839		}
840
841		opt.sopt_dir = SOPT_SET;
842		opt.sopt_val = &portlow;
843		error = sosetopt(so, &opt);
844		if (error)
845			goto out;
846	}
847
848	error = sobind(so, sa, curthread);
849
850	if (*portp == 0) {
851		if (error) {
852			opt.sopt_dir = SOPT_SET;
853			opt.sopt_val = &old;
854			sosetopt(so, &opt);
855		}
856	}
857out:
858	if (freesa)
859		free(sa, M_SONAME);
860
861	return (error);
862}
863
864/*
865 * Kernel module glue
866 */
867static int
868krpc_modevent(module_t mod, int type, void *data)
869{
870
871	return (0);
872}
873static moduledata_t krpc_mod = {
874	"krpc",
875	krpc_modevent,
876	NULL,
877};
878DECLARE_MODULE(krpc, krpc_mod, SI_SUB_VFS, SI_ORDER_ANY);
879
880/* So that loader and kldload(2) can find us, wherever we are.. */
881MODULE_VERSION(krpc, 1);
882