svc_vc.c revision 1.35 
1/*	$NetBSD: svc_vc.c,v 1.35 2021/08/08 20:54:48 nia Exp $	*/
2
3/*
4 * Copyright (c) 2010, Oracle America, Inc.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met:
9 *
10 *     * Redistributions of source code must retain the above copyright
11 *       notice, this list of conditions and the following disclaimer.
12 *     * Redistributions in binary form must reproduce the above
13 *       copyright notice, this list of conditions and the following
14 *       disclaimer in the documentation and/or other materials
15 *       provided with the distribution.
16 *     * Neither the name of the "Oracle America, Inc." nor the names of its
17 *       contributors may be used to endorse or promote products derived
18 *       from this software without specific prior written permission.
19 *
20 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
25 *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27 *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34#include <sys/cdefs.h>
35#if defined(LIBC_SCCS) && !defined(lint)
36#if 0
37static char *sccsid = "@(#)svc_tcp.c 1.21 87/08/11 Copyr 1984 Sun Micro";
38static char *sccsid = "@(#)svc_tcp.c	2.2 88/08/01 4.0 RPCSRC";
39#else
40__RCSID("$NetBSD: svc_vc.c,v 1.35 2021/08/08 20:54:48 nia Exp $");
41#endif
42#endif
43
44/*
45 * svc_vc.c, Server side for Connection Oriented based RPC.
46 *
47 * Actually implements two flavors of transporter -
48 * a tcp rendezvouser (a listner and connection establisher)
49 * and a record/tcp stream.
50 */
51
52#include "namespace.h"
53#include "reentrant.h"
54#include <sys/types.h>
55#include <sys/param.h>
56#include <sys/poll.h>
57#include <sys/socket.h>
58#include <sys/un.h>
59#include <sys/time.h>
60#include <netinet/in.h>
61
62#include <assert.h>
63#include <err.h>
64#include <errno.h>
65#include <fcntl.h>
66#include <stdio.h>
67#include <stdlib.h>
68#include <string.h>
69#include <unistd.h>
70
71#include <rpc/rpc.h>
72
73#include "svc_fdset.h"
74#include "rpc_internal.h"
75
76#ifdef __weak_alias
77__weak_alias(svc_fd_create,_svc_fd_create)
78__weak_alias(svc_vc_create,_svc_vc_create)
79#endif
80
81#ifdef _REENTRANT
82extern rwlock_t svc_fd_lock;
83#endif
84
85static SVCXPRT *makefd_xprt(int, u_int, u_int);
86static bool_t rendezvous_request(SVCXPRT *, struct rpc_msg *);
87static enum xprt_stat rendezvous_stat(SVCXPRT *);
88static void svc_vc_destroy(SVCXPRT *);
89static void __svc_vc_dodestroy(SVCXPRT *);
90static int read_vc(caddr_t, caddr_t, int);
91static int write_vc(caddr_t, caddr_t, int);
92static enum xprt_stat svc_vc_stat(SVCXPRT *);
93static bool_t svc_vc_recv(SVCXPRT *, struct rpc_msg *);
94static bool_t svc_vc_getargs(SVCXPRT *, xdrproc_t, caddr_t);
95static bool_t svc_vc_freeargs(SVCXPRT *, xdrproc_t, caddr_t);
96static bool_t svc_vc_reply(SVCXPRT *, struct rpc_msg *);
97static void svc_vc_rendezvous_ops(SVCXPRT *);
98static void svc_vc_ops(SVCXPRT *);
99static bool_t svc_vc_control(SVCXPRT *, const u_int, void *);
100static bool_t svc_vc_rendezvous_control(SVCXPRT *, const u_int, void *);
101
102struct cf_rendezvous { /* kept in xprt->xp_p1 for rendezvouser */
103	u_int sendsize;
104	u_int recvsize;
105	int maxrec;
106};
107
108struct cf_conn {  /* kept in xprt->xp_p1 for actual connection */
109	enum xprt_stat strm_stat;
110	u_int32_t x_id;
111	XDR xdrs;
112	char verf_body[MAX_AUTH_BYTES];
113	u_int sendsize;
114	u_int recvsize;
115	int maxrec;
116	bool_t nonblock;
117	struct timeval last_recv_time;
118};
119
120/*
121 * Usage:
122 *	xprt = svc_vc_create(sock, send_buf_size, recv_buf_size);
123 *
124 * Creates, registers, and returns a (rpc) tcp based transporter.
125 * Once *xprt is initialized, it is registered as a transporter
126 * see (svc.h, xprt_register).  This routine returns
127 * a NULL if a problem occurred.
128 *
129 * The filedescriptor passed in is expected to refer to a bound, but
130 * not yet connected socket.
131 *
132 * Since streams do buffered io similar to stdio, the caller can specify
133 * how big the send and receive buffers are via the second and third parms;
134 * 0 => use the system default.
135 */
136SVCXPRT *
137svc_vc_create(int fd, u_int sendsize, u_int recvsize)
138{
139	SVCXPRT *xprt;
140	struct cf_rendezvous *r = NULL;
141	struct __rpc_sockinfo si;
142	struct sockaddr_storage sslocal;
143	socklen_t slen;
144	int one = 1;
145
146	if (!__rpc_fd2sockinfo(fd, &si))
147		return NULL;
148
149	r = mem_alloc(sizeof(*r));
150	if (r == NULL) {
151		warn("%s: out of memory", __func__);
152		return NULL;
153	}
154	r->sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize);
155	r->recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize);
156	r->maxrec = __svc_maxrec;
157	xprt = mem_alloc(sizeof(SVCXPRT));
158	if (xprt == NULL) {
159		warn("%s: out of memory", __func__);
160		goto cleanup_svc_vc_create;
161	}
162	xprt->xp_tp = NULL;
163	xprt->xp_p1 = (caddr_t)(void *)r;
164	xprt->xp_p2 = NULL;
165	xprt->xp_p3 = NULL;
166	xprt->xp_verf = _null_auth;
167	svc_vc_rendezvous_ops(xprt);
168	xprt->xp_port = (u_short)-1;	/* It is the rendezvouser */
169	xprt->xp_fd = fd;
170
171	slen = sizeof (struct sockaddr_storage);
172	if (getsockname(fd, (struct sockaddr *)(void *)&sslocal, &slen) < 0) {
173		warn("%s: could not retrieve local addr", __func__);
174		goto cleanup_svc_vc_create;
175	}
176
177	/*
178	 * We want to be able to check credentials on local sockets.
179	 */
180	if (sslocal.ss_family == AF_LOCAL)
181		if (setsockopt(fd, SOL_LOCAL, LOCAL_CREDS, &one,
182		    (socklen_t)sizeof one) == -1)
183			goto cleanup_svc_vc_create;
184
185	xprt->xp_ltaddr.maxlen = xprt->xp_ltaddr.len = sslocal.ss_len;
186	xprt->xp_ltaddr.buf = mem_alloc((size_t)sslocal.ss_len);
187	if (xprt->xp_ltaddr.buf == NULL) {
188		warn("%s: out of memory", __func__);
189		goto cleanup_svc_vc_create;
190	}
191	memcpy(xprt->xp_ltaddr.buf, &sslocal, (size_t)sslocal.ss_len);
192
193	xprt->xp_rtaddr.maxlen = sizeof (struct sockaddr_storage);
194	if (!xprt_register(xprt))
195		goto cleanup_svc_vc_create;
196	return xprt;
197cleanup_svc_vc_create:
198	if (xprt)
199		mem_free(xprt, sizeof(*xprt));
200	if (r != NULL)
201		mem_free(r, sizeof(*r));
202	return NULL;
203}
204
205/*
206 * Like svtcp_create(), except the routine takes any *open* UNIX file
207 * descriptor as its first input.
208 */
209SVCXPRT *
210svc_fd_create(int fd, u_int sendsize, u_int recvsize)
211{
212	struct sockaddr_storage ss;
213	socklen_t slen;
214	SVCXPRT *ret;
215
216	_DIAGASSERT(fd != -1);
217
218	ret = makefd_xprt(fd, sendsize, recvsize);
219	if (ret == NULL)
220		return NULL;
221
222	slen = sizeof (struct sockaddr_storage);
223	if (getsockname(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) {
224		warn("%s: could not retrieve local addr", __func__);
225		goto freedata;
226	}
227	ret->xp_ltaddr.maxlen = ret->xp_ltaddr.len = ss.ss_len;
228	ret->xp_ltaddr.buf = mem_alloc((size_t)ss.ss_len);
229	if (ret->xp_ltaddr.buf == NULL) {
230		warn("%s: out of memory", __func__);
231		goto freedata;
232	}
233	memcpy(ret->xp_ltaddr.buf, &ss, (size_t)ss.ss_len);
234
235	slen = sizeof (struct sockaddr_storage);
236	if (getpeername(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) {
237		warn("%s: could not retrieve remote addr", __func__);
238		goto freedata;
239	}
240	ret->xp_rtaddr.maxlen = ret->xp_rtaddr.len = ss.ss_len;
241	ret->xp_rtaddr.buf = mem_alloc((size_t)ss.ss_len);
242	if (ret->xp_rtaddr.buf == NULL) {
243		warn("%s: out of memory", __func__);
244		goto freedata;
245	}
246	memcpy(ret->xp_rtaddr.buf, &ss, (size_t)ss.ss_len);
247#ifdef PORTMAP
248	if (ss.ss_family == AF_INET) {
249		ret->xp_raddr = *(struct sockaddr_in *)ret->xp_rtaddr.buf;
250		ret->xp_addrlen = sizeof (struct sockaddr_in);
251	}
252#endif
253
254	return ret;
255
256freedata:
257	if (ret->xp_ltaddr.buf != NULL)
258		mem_free(ret->xp_ltaddr.buf, rep->xp_ltaddr.maxlen);
259
260	return NULL;
261}
262
263static SVCXPRT *
264makefd_xprt(int fd, u_int sendsize, u_int recvsize)
265{
266	SVCXPRT *xprt;
267	struct cf_conn *cd;
268	const char *netid;
269	struct __rpc_sockinfo si;
270
271	_DIAGASSERT(fd != -1);
272
273	xprt = mem_alloc(sizeof(SVCXPRT));
274	if (xprt == NULL)
275		goto outofmem;
276	memset(xprt, 0, sizeof *xprt);
277	cd = mem_alloc(sizeof(struct cf_conn));
278	if (cd == NULL)
279		goto outofmem;
280	cd->strm_stat = XPRT_IDLE;
281	xdrrec_create(&(cd->xdrs), sendsize, recvsize,
282	    (caddr_t)(void *)xprt, read_vc, write_vc);
283	xprt->xp_p1 = (caddr_t)(void *)cd;
284	xprt->xp_verf.oa_base = cd->verf_body;
285	svc_vc_ops(xprt);  /* truely deals with calls */
286	xprt->xp_port = 0;  /* this is a connection, not a rendezvouser */
287	xprt->xp_fd = fd;
288	if (__rpc_fd2sockinfo(fd, &si) && __rpc_sockinfo2netid(&si, &netid))
289		if ((xprt->xp_netid = strdup(netid)) == NULL)
290			goto outofmem;
291
292	if (!xprt_register(xprt))
293		goto out;
294	return xprt;
295
296outofmem:
297	warn("svc_tcp: makefd_xprt");
298out:
299	if (xprt)
300		mem_free(xprt, sizeof(SVCXPRT));
301	return NULL;
302}
303
304/*ARGSUSED*/
305static bool_t
306rendezvous_request(SVCXPRT *xprt, struct rpc_msg *msg)
307{
308	int sock, flags;
309	struct cf_rendezvous *r;
310	struct cf_conn *cd;
311	struct sockaddr_storage addr;
312	socklen_t len;
313	struct __rpc_sockinfo si;
314	SVCXPRT *newxprt;
315
316	_DIAGASSERT(xprt != NULL);
317	_DIAGASSERT(msg != NULL);
318
319	r = (struct cf_rendezvous *)xprt->xp_p1;
320again:
321	len = sizeof addr;
322	if ((sock = accept(xprt->xp_fd, (struct sockaddr *)(void *)&addr,
323	    &len)) < 0) {
324		if (errno == EINTR)
325			goto again;
326		/*
327		 * Clean out the most idle file descriptor when we're
328		 * running out.
329		 */
330		if (errno == EMFILE || errno == ENFILE) {
331			if (__svc_clean_idle(NULL, 0, FALSE))
332				goto again;
333		}
334		return FALSE;
335	}
336	/*
337	 * make a new transporter (re-uses xprt)
338	 */
339	newxprt = makefd_xprt(sock, r->sendsize, r->recvsize);
340	if (newxprt == NULL)
341		goto out;
342	newxprt->xp_rtaddr.buf = mem_alloc(len);
343	if (newxprt->xp_rtaddr.buf == NULL)
344		goto out;
345	memcpy(newxprt->xp_rtaddr.buf, &addr, len);
346	newxprt->xp_rtaddr.len = len;
347#ifdef PORTMAP
348	if (addr.ss_family == AF_INET) {
349		newxprt->xp_raddr = *(struct sockaddr_in *)newxprt->xp_rtaddr.buf;
350		newxprt->xp_addrlen = sizeof (struct sockaddr_in);
351	}
352#endif
353	if (__rpc_fd2sockinfo(sock, &si))
354		__rpc_setnodelay(sock, &si);
355
356	cd = (struct cf_conn *)newxprt->xp_p1;
357
358	cd->recvsize = r->recvsize;
359	cd->sendsize = r->sendsize;
360	cd->maxrec = r->maxrec;
361
362	if (cd->maxrec != 0) {
363		flags = fcntl(sock, F_GETFL, 0);
364		if (flags  == -1)
365			goto out;
366		if (fcntl(sock, F_SETFL, flags | O_NONBLOCK) == -1)
367			goto out;
368		if (cd->recvsize > (u_int)cd->maxrec)
369			cd->recvsize = cd->maxrec;
370		cd->nonblock = TRUE;
371		__xdrrec_setnonblock(&cd->xdrs, cd->maxrec);
372	} else
373		cd->nonblock = FALSE;
374
375	(void)gettimeofday(&cd->last_recv_time, NULL);
376
377	return FALSE; /* there is never an rpc msg to be processed */
378out:
379	(void)close(sock);
380	return FALSE; /* there was an error */
381}
382
383/*ARGSUSED*/
384static enum xprt_stat
385rendezvous_stat(SVCXPRT *xprt)
386{
387
388	return XPRT_IDLE;
389}
390
391static void
392svc_vc_destroy(SVCXPRT *xprt)
393{
394	_DIAGASSERT(xprt != NULL);
395
396	xprt_unregister(xprt);
397	__svc_vc_dodestroy(xprt);
398}
399
400static void
401__svc_vc_dodestroy(SVCXPRT *xprt)
402{
403	struct cf_conn *cd;
404	struct cf_rendezvous *r;
405
406	cd = (struct cf_conn *)xprt->xp_p1;
407
408	if (xprt->xp_fd != RPC_ANYFD)
409		(void)close(xprt->xp_fd);
410	if (xprt->xp_port != 0) {
411		/* a rendezvouser socket */
412		r = (struct cf_rendezvous *)xprt->xp_p1;
413		mem_free(r, sizeof (struct cf_rendezvous));
414		xprt->xp_port = 0;
415	} else {
416		/* an actual connection socket */
417		XDR_DESTROY(&(cd->xdrs));
418		mem_free(cd, sizeof(struct cf_conn));
419	}
420	if (xprt->xp_rtaddr.buf)
421		mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.maxlen);
422	if (xprt->xp_ltaddr.buf)
423		mem_free(xprt->xp_ltaddr.buf, xprt->xp_ltaddr.maxlen);
424	if (xprt->xp_tp)
425		free(xprt->xp_tp);
426	if (xprt->xp_netid)
427		free(xprt->xp_netid);
428	mem_free(xprt, sizeof(SVCXPRT));
429}
430
431/*ARGSUSED*/
432static bool_t
433svc_vc_control(SVCXPRT *xprt, const u_int rq, void *in)
434{
435	return FALSE;
436}
437
438/*ARGSUSED*/
439static bool_t
440svc_vc_rendezvous_control(SVCXPRT *xprt, const u_int rq, void *in)
441{
442	struct cf_rendezvous *cfp;
443
444	cfp = (struct cf_rendezvous *)xprt->xp_p1;
445	if (cfp == NULL)
446		return FALSE;
447	switch (rq) {
448		case SVCGET_CONNMAXREC:
449			*(int *)in = cfp->maxrec;
450			break;
451		case SVCSET_CONNMAXREC:
452			cfp->maxrec = *(int *)in;
453			break;
454		default:
455			return FALSE;
456	}
457	return TRUE;
458}
459
460/*
461 * reads data from the tcp connection.
462 * any error is fatal and the connection is closed.
463 * (And a read of zero bytes is a half closed stream => error.)
464 * All read operations timeout after 35 seconds.  A timeout is
465 * fatal for the connection.
466 */
467static int
468read_vc(caddr_t xprtp, caddr_t buf, int len)
469{
470	SVCXPRT *xprt;
471	int sock;
472	struct pollfd pollfd;
473	struct sockaddr *sa;
474	struct msghdr msg;
475	struct cmsghdr *cmp;
476	void *crmsg = NULL;
477	struct sockcred *sc;
478	socklen_t crmsgsize;
479	struct cf_conn *cfp;
480	static const struct timespec ts = { 35, 0 };
481
482	xprt = (SVCXPRT *)(void *)xprtp;
483	_DIAGASSERT(xprt != NULL);
484
485	sock = xprt->xp_fd;
486
487	sa = (struct sockaddr *)xprt->xp_rtaddr.buf;
488	if (sa->sa_family == AF_LOCAL && xprt->xp_p2 == NULL) {
489		memset(&msg, 0, sizeof msg);
490		crmsgsize = CMSG_SPACE(SOCKCREDSIZE(NGROUPS));
491		crmsg = malloc(crmsgsize);
492		if (crmsg == NULL)
493			goto fatal_err;
494		memset(crmsg, 0, crmsgsize);
495
496		msg.msg_control = crmsg;
497		msg.msg_controllen = crmsgsize;
498
499		if (recvmsg(sock, &msg, 0) < 0)
500			goto fatal_err;
501
502		if (msg.msg_controllen == 0 ||
503		    (msg.msg_flags & MSG_CTRUNC) != 0)
504			goto fatal_err;
505
506		cmp = CMSG_FIRSTHDR(&msg);
507		if (cmp->cmsg_level != SOL_SOCKET ||
508		    cmp->cmsg_type != SCM_CREDS)
509			goto fatal_err;
510
511		sc = (struct sockcred *)(void *)CMSG_DATA(cmp);
512
513		xprt->xp_p2 = mem_alloc(SOCKCREDSIZE(sc->sc_ngroups));
514		if (xprt->xp_p2 == NULL)
515			goto fatal_err;
516
517		memcpy(xprt->xp_p2, sc, SOCKCREDSIZE(sc->sc_ngroups));
518		free(crmsg);
519		crmsg = NULL;
520	}
521
522	cfp = (struct cf_conn *)xprt->xp_p1;
523
524	if (cfp->nonblock) {
525		len = (int)read(sock, buf, (size_t)len);
526		if (len < 0) {
527			if (errno == EAGAIN)
528				len = 0;
529			else
530				goto fatal_err;
531		}
532		if (len != 0)
533			gettimeofday(&cfp->last_recv_time, NULL);
534		return len;
535	}
536
537	do {
538		pollfd.fd = sock;
539		pollfd.events = POLLIN;
540		switch (pollts(&pollfd, 1, &ts, NULL)) {
541		case -1:
542			if (errno == EINTR) {
543				continue;
544			}
545			/*FALLTHROUGH*/
546		case 0:
547			goto fatal_err;
548
549		default:
550			break;
551		}
552	} while ((pollfd.revents & POLLIN) == 0);
553
554	if ((len = (int)read(sock, buf, (size_t)len)) > 0) {
555		gettimeofday(&cfp->last_recv_time, NULL);
556		return len;
557	}
558
559fatal_err:
560	if (crmsg != NULL)
561		free(crmsg);
562	((struct cf_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;
563	return -1;
564}
565
566/*
567 * writes data to the tcp connection.
568 * Any error is fatal and the connection is closed.
569 */
570static int
571write_vc(caddr_t xprtp, caddr_t buf, int len)
572{
573	SVCXPRT *xprt;
574	int i, cnt;
575	struct cf_conn *cd;
576	struct timeval tv0, tv1;
577
578	xprt = (SVCXPRT *)(void *)xprtp;
579	_DIAGASSERT(xprt != NULL);
580
581	cd = (struct cf_conn *)xprt->xp_p1;
582
583	if (cd->nonblock)
584		gettimeofday(&tv0, NULL);
585
586	for (cnt = len; cnt > 0; cnt -= i, buf += i) {
587		if ((i = (int)write(xprt->xp_fd, buf, (size_t)cnt)) < 0) {
588			if (errno != EAGAIN || !cd->nonblock) {
589				cd->strm_stat = XPRT_DIED;
590				return -1;
591			}
592			if (cd->nonblock) {
593				/*
594				 * For non-blocking connections, do not
595				 * take more than 2 seconds writing the
596				 * data out.
597				 *
598				 * XXX 2 is an arbitrary amount.
599				 */
600				gettimeofday(&tv1, NULL);
601				if (tv1.tv_sec - tv0.tv_sec >= 2) {
602					cd->strm_stat = XPRT_DIED;
603					return -1;
604				}
605			}
606			i = 0;
607		}
608	}
609	return len;
610}
611
612static enum xprt_stat
613svc_vc_stat(SVCXPRT *xprt)
614{
615	struct cf_conn *cd;
616
617	_DIAGASSERT(xprt != NULL);
618
619	cd = (struct cf_conn *)(xprt->xp_p1);
620
621	if (cd->strm_stat == XPRT_DIED)
622		return XPRT_DIED;
623	if (! xdrrec_eof(&(cd->xdrs)))
624		return XPRT_MOREREQS;
625	return XPRT_IDLE;
626}
627
628static bool_t
629svc_vc_recv(SVCXPRT *xprt, struct rpc_msg *msg)
630{
631	struct cf_conn *cd;
632	XDR *xdrs;
633
634	_DIAGASSERT(xprt != NULL);
635	_DIAGASSERT(msg != NULL);
636
637	cd = (struct cf_conn *)(xprt->xp_p1);
638	xdrs = &(cd->xdrs);
639
640	if (cd->nonblock) {
641		if (!__xdrrec_getrec(xdrs, &cd->strm_stat, TRUE))
642			return FALSE;
643	}
644
645	xdrs->x_op = XDR_DECODE;
646	(void)xdrrec_skiprecord(xdrs);
647
648	if (xdr_callmsg(xdrs, msg)) {
649		cd->x_id = msg->rm_xid;
650		return TRUE;
651	}
652	cd->strm_stat = XPRT_DIED;
653	return FALSE;
654}
655
656static bool_t
657svc_vc_getargs(SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr)
658{
659
660	_DIAGASSERT(xprt != NULL);
661	/* args_ptr may be NULL */
662
663	return (*xdr_args)(&(((struct cf_conn *)(xprt->xp_p1))->xdrs),
664	    args_ptr);
665}
666
667static bool_t
668svc_vc_freeargs(SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr)
669{
670	XDR *xdrs;
671
672	_DIAGASSERT(xprt != NULL);
673	/* args_ptr may be NULL */
674
675	xdrs = &(((struct cf_conn *)(xprt->xp_p1))->xdrs);
676
677	xdrs->x_op = XDR_FREE;
678	return (*xdr_args)(xdrs, args_ptr);
679}
680
681static bool_t
682svc_vc_reply(SVCXPRT *xprt, struct rpc_msg *msg)
683{
684	struct cf_conn *cd;
685	XDR *xdrs;
686	bool_t rstat;
687
688	_DIAGASSERT(xprt != NULL);
689	_DIAGASSERT(msg != NULL);
690
691	cd = (struct cf_conn *)(xprt->xp_p1);
692	xdrs = &(cd->xdrs);
693
694	xdrs->x_op = XDR_ENCODE;
695	msg->rm_xid = cd->x_id;
696	rstat = xdr_replymsg(xdrs, msg);
697	(void)xdrrec_endofrecord(xdrs, TRUE);
698	return rstat;
699}
700
701static void
702svc_vc_ops(SVCXPRT *xprt)
703{
704	static struct xp_ops ops;
705	static struct xp_ops2 ops2;
706#ifdef _REENTRANT
707	extern mutex_t ops_lock;
708#endif
709
710/* VARIABLES PROTECTED BY ops_lock: ops, ops2 */
711
712	mutex_lock(&ops_lock);
713	if (ops.xp_recv == NULL) {
714		ops.xp_recv = svc_vc_recv;
715		ops.xp_stat = svc_vc_stat;
716		ops.xp_getargs = svc_vc_getargs;
717		ops.xp_reply = svc_vc_reply;
718		ops.xp_freeargs = svc_vc_freeargs;
719		ops.xp_destroy = svc_vc_destroy;
720		ops2.xp_control = svc_vc_control;
721	}
722	xprt->xp_ops = &ops;
723	xprt->xp_ops2 = &ops2;
724	mutex_unlock(&ops_lock);
725}
726
727static void
728svc_vc_rendezvous_ops(SVCXPRT *xprt)
729{
730	static struct xp_ops ops;
731	static struct xp_ops2 ops2;
732#ifdef _REENTRANT
733	extern mutex_t ops_lock;
734#endif
735	mutex_lock(&ops_lock);
736	if (ops.xp_recv == NULL) {
737		ops.xp_recv = rendezvous_request;
738		ops.xp_stat = rendezvous_stat;
739		ops.xp_getargs =
740		    (bool_t (*)(SVCXPRT *, xdrproc_t, caddr_t))abort;
741		ops.xp_reply =
742		    (bool_t (*)(SVCXPRT *, struct rpc_msg *))abort;
743		ops.xp_freeargs =
744		    (bool_t (*)(SVCXPRT *, xdrproc_t, caddr_t))abort;
745		ops.xp_destroy = svc_vc_destroy;
746		ops2.xp_control = svc_vc_rendezvous_control;
747	}
748	xprt->xp_ops = &ops;
749	xprt->xp_ops2 = &ops2;
750	mutex_unlock(&ops_lock);
751}
752
753/*
754 * Destroy xprts that have not have had any activity in 'timeout' seconds.
755 * If 'cleanblock' is true, blocking connections (the default) are also
756 * cleaned. If timeout is 0, the least active connection is picked.
757 */
758bool_t
759/*ARGSUSED1*/
760__svc_clean_idle(fd_set *fds __unused, int timeout, bool_t cleanblock)
761{
762	int i, ncleaned, *fdmax;
763	SVCXPRT *xprt, *least_active;
764	struct timeval tv, tdiff, tmax;
765	struct cf_conn *cd;
766
767	gettimeofday(&tv, NULL);
768	tmax.tv_sec = tmax.tv_usec = 0;
769	least_active = NULL;
770	rwlock_wrlock(&svc_fd_lock);
771	fdmax = svc_fdset_getmax();
772	if (fdmax == NULL)
773		return FALSE;
774	for (i = ncleaned = 0; i <= *fdmax; i++) {
775		switch (svc_fdset_isset(i)) {
776		case 0:
777		case -1:
778			continue;
779		default:
780			break;
781		}
782
783		xprt = __svc_xports[i];
784		if (xprt == NULL || xprt->xp_ops == NULL ||
785		    xprt->xp_ops->xp_recv != svc_vc_recv)
786			continue;
787
788		cd = (struct cf_conn *)xprt->xp_p1;
789		if (!cleanblock && !cd->nonblock)
790			continue;
791
792		if (timeout == 0) {
793			timersub(&tv, &cd->last_recv_time, &tdiff);
794			if (timercmp(&tdiff, &tmax, >)) {
795				tmax = tdiff;
796				least_active = xprt;
797			}
798			continue;
799		}
800
801		if (tv.tv_sec - cd->last_recv_time.tv_sec > timeout) {
802			__xprt_unregister_unlocked(xprt);
803			__svc_vc_dodestroy(xprt);
804			ncleaned++;
805		}
806	}
807	if (timeout == 0 && least_active != NULL) {
808		__xprt_unregister_unlocked(least_active);
809		__svc_vc_dodestroy(least_active);
810		ncleaned++;
811	}
812	rwlock_unlock(&svc_fd_lock);
813	return ncleaned > 0 ? TRUE : FALSE;
814}
815