rpc_generic.c revision 223309 
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 223309 2011-06-19 22:08:55Z rmacklem $");
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#include <rpc/rpcsec_gss.h>
64
65#include <rpc/rpc_com.h>
66
67extern	u_long sb_max_adj;	/* not defined in socketvar.h */
68
69#if __FreeBSD_version < 700000
70#define strrchr rindex
71#endif
72
73/* Provide an entry point hook for the rpcsec_gss module. */
74struct rpc_gss_entries	rpc_gss_entries;
75
76struct handle {
77	NCONF_HANDLE *nhandle;
78	int nflag;		/* Whether NETPATH or NETCONFIG */
79	int nettype;
80};
81
82static const struct _rpcnettype {
83	const char *name;
84	const int type;
85} _rpctypelist[] = {
86	{ "netpath", _RPC_NETPATH },
87	{ "visible", _RPC_VISIBLE },
88	{ "circuit_v", _RPC_CIRCUIT_V },
89	{ "datagram_v", _RPC_DATAGRAM_V },
90	{ "circuit_n", _RPC_CIRCUIT_N },
91	{ "datagram_n", _RPC_DATAGRAM_N },
92	{ "tcp", _RPC_TCP },
93	{ "udp", _RPC_UDP },
94	{ 0, _RPC_NONE }
95};
96
97struct netid_af {
98	const char	*netid;
99	int		af;
100	int		protocol;
101};
102
103static const struct netid_af na_cvt[] = {
104	{ "udp",  AF_INET,  IPPROTO_UDP },
105	{ "tcp",  AF_INET,  IPPROTO_TCP },
106#ifdef INET6
107	{ "udp6", AF_INET6, IPPROTO_UDP },
108	{ "tcp6", AF_INET6, IPPROTO_TCP },
109#endif
110	{ "local", AF_LOCAL, 0 }
111};
112
113struct rpc_createerr rpc_createerr;
114
115/*
116 * Find the appropriate buffer size
117 */
118u_int
119/*ARGSUSED*/
120__rpc_get_t_size(int af, int proto, int size)
121{
122	int defsize;
123
124	switch (proto) {
125	case IPPROTO_TCP:
126		defsize = 64 * 1024;	/* XXX */
127		break;
128	case IPPROTO_UDP:
129		defsize = UDPMSGSIZE;
130		break;
131	default:
132		defsize = RPC_MAXDATASIZE;
133		break;
134	}
135	if (size == 0)
136		return defsize;
137
138	/* Check whether the value is within the upper max limit */
139	return (size > sb_max_adj ? (u_int)sb_max_adj : (u_int)size);
140}
141
142/*
143 * Find the appropriate address buffer size
144 */
145u_int
146__rpc_get_a_size(af)
147	int af;
148{
149	switch (af) {
150	case AF_INET:
151		return sizeof (struct sockaddr_in);
152#ifdef INET6
153	case AF_INET6:
154		return sizeof (struct sockaddr_in6);
155#endif
156	case AF_LOCAL:
157		return sizeof (struct sockaddr_un);
158	default:
159		break;
160	}
161	return ((u_int)RPC_MAXADDRSIZE);
162}
163
164#if 0
165
166/*
167 * Used to ping the NULL procedure for clnt handle.
168 * Returns NULL if fails, else a non-NULL pointer.
169 */
170void *
171rpc_nullproc(clnt)
172	CLIENT *clnt;
173{
174	struct timeval TIMEOUT = {25, 0};
175
176	if (clnt_call(clnt, NULLPROC, (xdrproc_t) xdr_void, NULL,
177		(xdrproc_t) xdr_void, NULL, TIMEOUT) != RPC_SUCCESS) {
178		return (NULL);
179	}
180	return ((void *) clnt);
181}
182
183#endif
184
185int
186__rpc_socket2sockinfo(struct socket *so, struct __rpc_sockinfo *sip)
187{
188	int type, proto;
189	struct sockaddr *sa;
190	sa_family_t family;
191	struct sockopt opt;
192	int error;
193
194	CURVNET_SET(so->so_vnet);
195	error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
196	CURVNET_RESTORE();
197	if (error)
198		return 0;
199
200	sip->si_alen = sa->sa_len;
201	family = sa->sa_family;
202	free(sa, M_SONAME);
203
204	opt.sopt_dir = SOPT_GET;
205	opt.sopt_level = SOL_SOCKET;
206	opt.sopt_name = SO_TYPE;
207	opt.sopt_val = &type;
208	opt.sopt_valsize = sizeof type;
209	opt.sopt_td = NULL;
210	error = sogetopt(so, &opt);
211	if (error)
212		return 0;
213
214	/* XXX */
215	if (family != AF_LOCAL) {
216		if (type == SOCK_STREAM)
217			proto = IPPROTO_TCP;
218		else if (type == SOCK_DGRAM)
219			proto = IPPROTO_UDP;
220		else
221			return 0;
222	} else
223		proto = 0;
224
225	sip->si_af = family;
226	sip->si_proto = proto;
227	sip->si_socktype = type;
228
229	return 1;
230}
231
232/*
233 * Linear search, but the number of entries is small.
234 */
235int
236__rpc_nconf2sockinfo(const struct netconfig *nconf, struct __rpc_sockinfo *sip)
237{
238	int i;
239
240	for (i = 0; i < (sizeof na_cvt) / (sizeof (struct netid_af)); i++)
241		if (strcmp(na_cvt[i].netid, nconf->nc_netid) == 0 || (
242		    strcmp(nconf->nc_netid, "unix") == 0 &&
243		    strcmp(na_cvt[i].netid, "local") == 0)) {
244			sip->si_af = na_cvt[i].af;
245			sip->si_proto = na_cvt[i].protocol;
246			sip->si_socktype =
247			    __rpc_seman2socktype((int)nconf->nc_semantics);
248			if (sip->si_socktype == -1)
249				return 0;
250			sip->si_alen = __rpc_get_a_size(sip->si_af);
251			return 1;
252		}
253
254	return 0;
255}
256
257struct socket *
258__rpc_nconf2socket(const struct netconfig *nconf)
259{
260	struct __rpc_sockinfo si;
261	struct socket *so;
262	int error;
263
264	if (!__rpc_nconf2sockinfo(nconf, &si))
265		return 0;
266
267	so = NULL;
268	error =  socreate(si.si_af, &so, si.si_socktype, si.si_proto,
269	    curthread->td_ucred, curthread);
270
271	if (error)
272		return NULL;
273	else
274		return so;
275}
276
277char *
278taddr2uaddr(const struct netconfig *nconf, const struct netbuf *nbuf)
279{
280	struct __rpc_sockinfo si;
281
282	if (!__rpc_nconf2sockinfo(nconf, &si))
283		return NULL;
284	return __rpc_taddr2uaddr_af(si.si_af, nbuf);
285}
286
287struct netbuf *
288uaddr2taddr(const struct netconfig *nconf, const char *uaddr)
289{
290	struct __rpc_sockinfo si;
291
292	if (!__rpc_nconf2sockinfo(nconf, &si))
293		return NULL;
294	return __rpc_uaddr2taddr_af(si.si_af, uaddr);
295}
296
297char *
298__rpc_taddr2uaddr_af(int af, const struct netbuf *nbuf)
299{
300	char *ret;
301	struct sbuf sb;
302	struct sockaddr_in *sin;
303	struct sockaddr_un *sun;
304	char namebuf[INET_ADDRSTRLEN];
305#ifdef INET6
306	struct sockaddr_in6 *sin6;
307	char namebuf6[INET6_ADDRSTRLEN];
308#endif
309	u_int16_t port;
310
311	sbuf_new(&sb, NULL, 0, SBUF_AUTOEXTEND);
312
313	switch (af) {
314	case AF_INET:
315		sin = nbuf->buf;
316		if (inet_ntop(af, &sin->sin_addr, namebuf, sizeof namebuf)
317		    == NULL)
318			return NULL;
319		port = ntohs(sin->sin_port);
320		if (sbuf_printf(&sb, "%s.%u.%u", namebuf,
321			((uint32_t)port) >> 8,
322			port & 0xff) < 0)
323			return NULL;
324		break;
325#ifdef INET6
326	case AF_INET6:
327		sin6 = nbuf->buf;
328		if (inet_ntop(af, &sin6->sin6_addr, namebuf6, sizeof namebuf6)
329		    == NULL)
330			return NULL;
331		port = ntohs(sin6->sin6_port);
332		if (sbuf_printf(&sb, "%s.%u.%u", namebuf6,
333			((uint32_t)port) >> 8,
334			port & 0xff) < 0)
335			return NULL;
336		break;
337#endif
338	case AF_LOCAL:
339		sun = nbuf->buf;
340		if (sbuf_printf(&sb, "%.*s", (int)(sun->sun_len -
341			    offsetof(struct sockaddr_un, sun_path)),
342			sun->sun_path) < 0)
343			return (NULL);
344		break;
345	default:
346		return NULL;
347	}
348
349	sbuf_finish(&sb);
350	ret = strdup(sbuf_data(&sb), M_RPC);
351	sbuf_delete(&sb);
352
353	return ret;
354}
355
356struct netbuf *
357__rpc_uaddr2taddr_af(int af, const char *uaddr)
358{
359	struct netbuf *ret = NULL;
360	char *addrstr, *p;
361	unsigned port, portlo, porthi;
362	struct sockaddr_in *sin;
363#ifdef INET6
364	struct sockaddr_in6 *sin6;
365#endif
366	struct sockaddr_un *sun;
367
368	port = 0;
369	sin = NULL;
370	addrstr = strdup(uaddr, M_RPC);
371	if (addrstr == NULL)
372		return NULL;
373
374	/*
375	 * AF_LOCAL addresses are expected to be absolute
376	 * pathnames, anything else will be AF_INET or AF_INET6.
377	 */
378	if (*addrstr != '/') {
379		p = strrchr(addrstr, '.');
380		if (p == NULL)
381			goto out;
382		portlo = (unsigned)strtol(p + 1, NULL, 10);
383		*p = '\0';
384
385		p = strrchr(addrstr, '.');
386		if (p == NULL)
387			goto out;
388		porthi = (unsigned)strtol(p + 1, NULL, 10);
389		*p = '\0';
390		port = (porthi << 8) | portlo;
391	}
392
393	ret = (struct netbuf *)malloc(sizeof *ret, M_RPC, M_WAITOK);
394	if (ret == NULL)
395		goto out;
396
397	switch (af) {
398	case AF_INET:
399		sin = (struct sockaddr_in *)malloc(sizeof *sin, M_RPC,
400		    M_WAITOK);
401		if (sin == NULL)
402			goto out;
403		memset(sin, 0, sizeof *sin);
404		sin->sin_family = AF_INET;
405		sin->sin_port = htons(port);
406		if (inet_pton(AF_INET, addrstr, &sin->sin_addr) <= 0) {
407			free(sin, M_RPC);
408			free(ret, M_RPC);
409			ret = NULL;
410			goto out;
411		}
412		sin->sin_len = ret->maxlen = ret->len = sizeof *sin;
413		ret->buf = sin;
414		break;
415#ifdef INET6
416	case AF_INET6:
417		sin6 = (struct sockaddr_in6 *)malloc(sizeof *sin6, M_RPC,
418		    M_WAITOK);
419		if (sin6 == NULL)
420			goto out;
421		memset(sin6, 0, sizeof *sin6);
422		sin6->sin6_family = AF_INET6;
423		sin6->sin6_port = htons(port);
424		if (inet_pton(AF_INET6, addrstr, &sin6->sin6_addr) <= 0) {
425			free(sin6, M_RPC);
426			free(ret, M_RPC);
427			ret = NULL;
428			goto out;
429		}
430		sin6->sin6_len = ret->maxlen = ret->len = sizeof *sin6;
431		ret->buf = sin6;
432		break;
433#endif
434	case AF_LOCAL:
435		sun = (struct sockaddr_un *)malloc(sizeof *sun, M_RPC,
436		    M_WAITOK);
437		if (sun == NULL)
438			goto out;
439		memset(sun, 0, sizeof *sun);
440		sun->sun_family = AF_LOCAL;
441		strncpy(sun->sun_path, addrstr, sizeof(sun->sun_path) - 1);
442		ret->len = ret->maxlen = sun->sun_len = SUN_LEN(sun);
443		ret->buf = sun;
444		break;
445	default:
446		break;
447	}
448out:
449	free(addrstr, M_RPC);
450	return ret;
451}
452
453int
454__rpc_seman2socktype(int semantics)
455{
456	switch (semantics) {
457	case NC_TPI_CLTS:
458		return SOCK_DGRAM;
459	case NC_TPI_COTS_ORD:
460		return SOCK_STREAM;
461	case NC_TPI_RAW:
462		return SOCK_RAW;
463	default:
464		break;
465	}
466
467	return -1;
468}
469
470int
471__rpc_socktype2seman(int socktype)
472{
473	switch (socktype) {
474	case SOCK_DGRAM:
475		return NC_TPI_CLTS;
476	case SOCK_STREAM:
477		return NC_TPI_COTS_ORD;
478	case SOCK_RAW:
479		return NC_TPI_RAW;
480	default:
481		break;
482	}
483
484	return -1;
485}
486
487/*
488 * Returns the type of the network as defined in <rpc/nettype.h>
489 * If nettype is NULL, it defaults to NETPATH.
490 */
491static int
492getnettype(const char *nettype)
493{
494	int i;
495
496	if ((nettype == NULL) || (nettype[0] == 0)) {
497		return (_RPC_NETPATH);	/* Default */
498	}
499
500#if 0
501	nettype = strlocase(nettype);
502#endif
503	for (i = 0; _rpctypelist[i].name; i++)
504		if (strcasecmp(nettype, _rpctypelist[i].name) == 0) {
505			return (_rpctypelist[i].type);
506		}
507	return (_rpctypelist[i].type);
508}
509
510/*
511 * For the given nettype (tcp or udp only), return the first structure found.
512 * This should be freed by calling freenetconfigent()
513 */
514struct netconfig *
515__rpc_getconfip(const char *nettype)
516{
517	char *netid;
518	static char *netid_tcp = (char *) NULL;
519	static char *netid_udp = (char *) NULL;
520	struct netconfig *dummy;
521
522	if (!netid_udp && !netid_tcp) {
523		struct netconfig *nconf;
524		void *confighandle;
525
526		if (!(confighandle = setnetconfig())) {
527			log(LOG_ERR, "rpc: failed to open " NETCONFIG);
528			return (NULL);
529		}
530		while ((nconf = getnetconfig(confighandle)) != NULL) {
531			if (strcmp(nconf->nc_protofmly, NC_INET) == 0) {
532				if (strcmp(nconf->nc_proto, NC_TCP) == 0) {
533					netid_tcp = strdup(nconf->nc_netid,
534					    M_RPC);
535				} else
536				if (strcmp(nconf->nc_proto, NC_UDP) == 0) {
537					netid_udp = strdup(nconf->nc_netid,
538					    M_RPC);
539				}
540			}
541		}
542		endnetconfig(confighandle);
543	}
544	if (strcmp(nettype, "udp") == 0)
545		netid = netid_udp;
546	else if (strcmp(nettype, "tcp") == 0)
547		netid = netid_tcp;
548	else {
549		return (NULL);
550	}
551	if ((netid == NULL) || (netid[0] == 0)) {
552		return (NULL);
553	}
554	dummy = getnetconfigent(netid);
555	return (dummy);
556}
557
558/*
559 * Returns the type of the nettype, which should then be used with
560 * __rpc_getconf().
561 *
562 * For simplicity in the kernel, we don't support the NETPATH
563 * environment variable. We behave as userland would then NETPATH is
564 * unset, i.e. iterate over all visible entries in netconfig.
565 */
566void *
567__rpc_setconf(nettype)
568	const char *nettype;
569{
570	struct handle *handle;
571
572	handle = (struct handle *) malloc(sizeof (struct handle),
573	    M_RPC, M_WAITOK);
574	switch (handle->nettype = getnettype(nettype)) {
575	case _RPC_NETPATH:
576	case _RPC_CIRCUIT_N:
577	case _RPC_DATAGRAM_N:
578		if (!(handle->nhandle = setnetconfig()))
579			goto failed;
580		handle->nflag = TRUE;
581		break;
582	case _RPC_VISIBLE:
583	case _RPC_CIRCUIT_V:
584	case _RPC_DATAGRAM_V:
585	case _RPC_TCP:
586	case _RPC_UDP:
587		if (!(handle->nhandle = setnetconfig())) {
588		        log(LOG_ERR, "rpc: failed to open " NETCONFIG);
589			goto failed;
590		}
591		handle->nflag = FALSE;
592		break;
593	default:
594		goto failed;
595	}
596
597	return (handle);
598
599failed:
600	free(handle, M_RPC);
601	return (NULL);
602}
603
604/*
605 * Returns the next netconfig struct for the given "net" type.
606 * __rpc_setconf() should have been called previously.
607 */
608struct netconfig *
609__rpc_getconf(void *vhandle)
610{
611	struct handle *handle;
612	struct netconfig *nconf;
613
614	handle = (struct handle *)vhandle;
615	if (handle == NULL) {
616		return (NULL);
617	}
618	for (;;) {
619		if (handle->nflag) {
620			nconf = getnetconfig(handle->nhandle);
621			if (nconf && !(nconf->nc_flag & NC_VISIBLE))
622				continue;
623		} else {
624			nconf = getnetconfig(handle->nhandle);
625		}
626		if (nconf == NULL)
627			break;
628		if ((nconf->nc_semantics != NC_TPI_CLTS) &&
629			(nconf->nc_semantics != NC_TPI_COTS) &&
630			(nconf->nc_semantics != NC_TPI_COTS_ORD))
631			continue;
632		switch (handle->nettype) {
633		case _RPC_VISIBLE:
634			if (!(nconf->nc_flag & NC_VISIBLE))
635				continue;
636			/* FALLTHROUGH */
637		case _RPC_NETPATH:	/* Be happy */
638			break;
639		case _RPC_CIRCUIT_V:
640			if (!(nconf->nc_flag & NC_VISIBLE))
641				continue;
642			/* FALLTHROUGH */
643		case _RPC_CIRCUIT_N:
644			if ((nconf->nc_semantics != NC_TPI_COTS) &&
645				(nconf->nc_semantics != NC_TPI_COTS_ORD))
646				continue;
647			break;
648		case _RPC_DATAGRAM_V:
649			if (!(nconf->nc_flag & NC_VISIBLE))
650				continue;
651			/* FALLTHROUGH */
652		case _RPC_DATAGRAM_N:
653			if (nconf->nc_semantics != NC_TPI_CLTS)
654				continue;
655			break;
656		case _RPC_TCP:
657			if (((nconf->nc_semantics != NC_TPI_COTS) &&
658				(nconf->nc_semantics != NC_TPI_COTS_ORD)) ||
659				(strcmp(nconf->nc_protofmly, NC_INET)
660#ifdef INET6
661				 && strcmp(nconf->nc_protofmly, NC_INET6))
662#else
663				)
664#endif
665				||
666				strcmp(nconf->nc_proto, NC_TCP))
667				continue;
668			break;
669		case _RPC_UDP:
670			if ((nconf->nc_semantics != NC_TPI_CLTS) ||
671				(strcmp(nconf->nc_protofmly, NC_INET)
672#ifdef INET6
673				&& strcmp(nconf->nc_protofmly, NC_INET6))
674#else
675				)
676#endif
677				||
678				strcmp(nconf->nc_proto, NC_UDP))
679				continue;
680			break;
681		}
682		break;
683	}
684	return (nconf);
685}
686
687void
688__rpc_endconf(vhandle)
689	void * vhandle;
690{
691	struct handle *handle;
692
693	handle = (struct handle *) vhandle;
694	if (handle == NULL) {
695		return;
696	}
697	endnetconfig(handle->nhandle);
698	free(handle, M_RPC);
699}
700
701int
702__rpc_sockisbound(struct socket *so)
703{
704	struct sockaddr *sa;
705	int error, bound;
706
707	error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
708	if (error)
709		return (0);
710
711	switch (sa->sa_family) {
712		case AF_INET:
713			bound = (((struct sockaddr_in *) sa)->sin_port != 0);
714			break;
715#ifdef INET6
716		case AF_INET6:
717			bound = (((struct sockaddr_in6 *) sa)->sin6_port != 0);
718			break;
719#endif
720		case AF_LOCAL:
721			/* XXX check this */
722			bound = (((struct sockaddr_un *) sa)->sun_path[0] != '\0');
723			break;
724		default:
725			bound = FALSE;
726			break;
727	}
728
729	free(sa, M_SONAME);
730
731	return bound;
732}
733
734/*
735 * Implement XDR-style API for RPC call.
736 */
737enum clnt_stat
738clnt_call_private(
739	CLIENT		*cl,		/* client handle */
740	struct rpc_callextra *ext,	/* call metadata */
741	rpcproc_t	proc,		/* procedure number */
742	xdrproc_t	xargs,		/* xdr routine for args */
743	void		*argsp,		/* pointer to args */
744	xdrproc_t	xresults,	/* xdr routine for results */
745	void		*resultsp,	/* pointer to results */
746	struct timeval	utimeout)	/* seconds to wait before giving up */
747{
748	XDR xdrs;
749	struct mbuf *mreq;
750	struct mbuf *mrep;
751	enum clnt_stat stat;
752
753	MGET(mreq, M_WAIT, MT_DATA);
754	MCLGET(mreq, M_WAIT);
755	mreq->m_len = 0;
756
757	xdrmbuf_create(&xdrs, mreq, XDR_ENCODE);
758	if (!xargs(&xdrs, argsp)) {
759		m_freem(mreq);
760		return (RPC_CANTENCODEARGS);
761	}
762	XDR_DESTROY(&xdrs);
763
764	stat = CLNT_CALL_MBUF(cl, ext, proc, mreq, &mrep, utimeout);
765	m_freem(mreq);
766
767	if (stat == RPC_SUCCESS) {
768		xdrmbuf_create(&xdrs, mrep, XDR_DECODE);
769		if (!xresults(&xdrs, resultsp)) {
770			XDR_DESTROY(&xdrs);
771			return (RPC_CANTDECODERES);
772		}
773		XDR_DESTROY(&xdrs);
774	}
775
776	return (stat);
777}
778
779/*
780 * Bind a socket to a privileged IP port
781 */
782int
783bindresvport(struct socket *so, struct sockaddr *sa)
784{
785	int old, error, af;
786	bool_t freesa = FALSE;
787	struct sockaddr_in *sin;
788#ifdef INET6
789	struct sockaddr_in6 *sin6;
790#endif
791	struct sockopt opt;
792	int proto, portrange, portlow;
793	u_int16_t *portp;
794	socklen_t salen;
795
796	if (sa == NULL) {
797		error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
798		if (error)
799			return (error);
800		freesa = TRUE;
801		af = sa->sa_family;
802		salen = sa->sa_len;
803		memset(sa, 0, sa->sa_len);
804	} else {
805		af = sa->sa_family;
806		salen = sa->sa_len;
807	}
808
809	switch (af) {
810	case AF_INET:
811		proto = IPPROTO_IP;
812		portrange = IP_PORTRANGE;
813		portlow = IP_PORTRANGE_LOW;
814		sin = (struct sockaddr_in *)sa;
815		portp = &sin->sin_port;
816		break;
817#ifdef INET6
818	case AF_INET6:
819		proto = IPPROTO_IPV6;
820		portrange = IPV6_PORTRANGE;
821		portlow = IPV6_PORTRANGE_LOW;
822		sin6 = (struct sockaddr_in6 *)sa;
823		portp = &sin6->sin6_port;
824		break;
825#endif
826	default:
827		return (EPFNOSUPPORT);
828	}
829
830	sa->sa_family = af;
831	sa->sa_len = salen;
832
833	if (*portp == 0) {
834		bzero(&opt, sizeof(opt));
835		opt.sopt_dir = SOPT_GET;
836		opt.sopt_level = proto;
837		opt.sopt_name = portrange;
838		opt.sopt_val = &old;
839		opt.sopt_valsize = sizeof(old);
840		error = sogetopt(so, &opt);
841		if (error) {
842			goto out;
843		}
844
845		opt.sopt_dir = SOPT_SET;
846		opt.sopt_val = &portlow;
847		error = sosetopt(so, &opt);
848		if (error)
849			goto out;
850	}
851
852	error = sobind(so, sa, curthread);
853
854	if (*portp == 0) {
855		if (error) {
856			opt.sopt_dir = SOPT_SET;
857			opt.sopt_val = &old;
858			sosetopt(so, &opt);
859		}
860	}
861out:
862	if (freesa)
863		free(sa, M_SONAME);
864
865	return (error);
866}
867
868/*
869 * Kernel module glue
870 */
871static int
872krpc_modevent(module_t mod, int type, void *data)
873{
874
875	return (0);
876}
877static moduledata_t krpc_mod = {
878	"krpc",
879	krpc_modevent,
880	NULL,
881};
882DECLARE_MODULE(krpc, krpc_mod, SI_SUB_VFS, SI_ORDER_ANY);
883
884/* So that loader and kldload(2) can find us, wherever we are.. */
885MODULE_VERSION(krpc, 1);
886