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[FreeBSD/releng/9.2.git] / sys / rpc / clnt_vc.c
1 /*      $NetBSD: clnt_vc.c,v 1.4 2000/07/14 08:40:42 fvdl 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 #if defined(LIBC_SCCS) && !defined(lint)
33 static char *sccsid2 = "@(#)clnt_tcp.c 1.37 87/10/05 Copyr 1984 Sun Micro";
34 static char *sccsid = "@(#)clnt_tcp.c   2.2 88/08/01 4.0 RPCSRC";
35 static char sccsid3[] = "@(#)clnt_vc.c 1.19 89/03/16 Copyr 1988 Sun Micro";
36 #endif
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
39  
40 /*
41  * clnt_tcp.c, Implements a TCP/IP based, client side RPC.
42  *
43  * Copyright (C) 1984, Sun Microsystems, Inc.
44  *
45  * TCP based RPC supports 'batched calls'.
46  * A sequence of calls may be batched-up in a send buffer.  The rpc call
47  * return immediately to the client even though the call was not necessarily
48  * sent.  The batching occurs if the results' xdr routine is NULL (0) AND
49  * the rpc timeout value is zero (see clnt.h, rpc).
50  *
51  * Clients should NOT casually batch calls that in fact return results; that is,
52  * the server side should be aware that a call is batched and not produce any
53  * return message.  Batched calls that produce many result messages can
54  * deadlock (netlock) the client and the server....
55  *
56  * Now go hang yourself.
57  */
58
59 #include <sys/param.h>
60 #include <sys/systm.h>
61 #include <sys/lock.h>
62 #include <sys/malloc.h>
63 #include <sys/mbuf.h>
64 #include <sys/mutex.h>
65 #include <sys/pcpu.h>
66 #include <sys/proc.h>
67 #include <sys/protosw.h>
68 #include <sys/socket.h>
69 #include <sys/socketvar.h>
70 #include <sys/syslog.h>
71 #include <sys/time.h>
72 #include <sys/uio.h>
73
74 #include <net/vnet.h>
75
76 #include <netinet/tcp.h>
77
78 #include <rpc/rpc.h>
79 #include <rpc/rpc_com.h>
80
81 #define MCALL_MSG_SIZE 24
82
83 struct cmessage {
84         struct cmsghdr cmsg;
85         struct cmsgcred cmcred;
86 };
87
88 static enum clnt_stat clnt_vc_call(CLIENT *, struct rpc_callextra *,
89     rpcproc_t, struct mbuf *, struct mbuf **, struct timeval);
90 static void clnt_vc_geterr(CLIENT *, struct rpc_err *);
91 static bool_t clnt_vc_freeres(CLIENT *, xdrproc_t, void *);
92 static void clnt_vc_abort(CLIENT *);
93 static bool_t clnt_vc_control(CLIENT *, u_int, void *);
94 static void clnt_vc_close(CLIENT *);
95 static void clnt_vc_destroy(CLIENT *);
96 static bool_t time_not_ok(struct timeval *);
97 static int clnt_vc_soupcall(struct socket *so, void *arg, int waitflag);
98
99 static struct clnt_ops clnt_vc_ops = {
100         .cl_call =      clnt_vc_call,
101         .cl_abort =     clnt_vc_abort,
102         .cl_geterr =    clnt_vc_geterr,
103         .cl_freeres =   clnt_vc_freeres,
104         .cl_close =     clnt_vc_close,
105         .cl_destroy =   clnt_vc_destroy,
106         .cl_control =   clnt_vc_control
107 };
108
109 /*
110  * A pending RPC request which awaits a reply. Requests which have
111  * received their reply will have cr_xid set to zero and cr_mrep to
112  * the mbuf chain of the reply.
113  */
114 struct ct_request {
115         TAILQ_ENTRY(ct_request) cr_link;
116         uint32_t                cr_xid;         /* XID of request */
117         struct mbuf             *cr_mrep;       /* reply received by upcall */
118         int                     cr_error;       /* any error from upcall */
119         char                    cr_verf[MAX_AUTH_BYTES]; /* reply verf */
120 };
121
122 TAILQ_HEAD(ct_request_list, ct_request);
123
124 struct ct_data {
125         struct mtx      ct_lock;
126         int             ct_threads;     /* number of threads in clnt_vc_call */
127         bool_t          ct_closing;     /* TRUE if we are closing */
128         bool_t          ct_closed;      /* TRUE if we are closed */
129         struct socket   *ct_socket;     /* connection socket */
130         bool_t          ct_closeit;     /* close it on destroy */
131         struct timeval  ct_wait;        /* wait interval in milliseconds */
132         struct sockaddr_storage ct_addr; /* remote addr */
133         struct rpc_err  ct_error;
134         uint32_t        ct_xid;
135         char            ct_mcallc[MCALL_MSG_SIZE]; /* marshalled callmsg */
136         size_t          ct_mpos;        /* pos after marshal */
137         const char      *ct_waitchan;
138         int             ct_waitflag;
139         struct mbuf     *ct_record;     /* current reply record */
140         size_t          ct_record_resid; /* how much left of reply to read */
141         bool_t          ct_record_eor;   /* true if reading last fragment */
142         struct ct_request_list ct_pending;
143         int             ct_upcallrefs;  /* Ref cnt of upcalls in prog. */
144 };
145
146 static void clnt_vc_upcallsdone(struct ct_data *);
147
148 static const char clnt_vc_errstr[] = "%s : %s";
149 static const char clnt_vc_str[] = "clnt_vc_create";
150 static const char clnt_read_vc_str[] = "read_vc";
151 static const char __no_mem_str[] = "out of memory";
152
153 /*
154  * Create a client handle for a connection.
155  * Default options are set, which the user can change using clnt_control()'s.
156  * The rpc/vc package does buffering similar to stdio, so the client
157  * must pick send and receive buffer sizes, 0 => use the default.
158  * NB: fd is copied into a private area.
159  * NB: The rpch->cl_auth is set null authentication. Caller may wish to
160  * set this something more useful.
161  *
162  * fd should be an open socket
163  */
164 CLIENT *
165 clnt_vc_create(
166         struct socket *so,              /* open file descriptor */
167         struct sockaddr *raddr,         /* servers address */
168         const rpcprog_t prog,           /* program number */
169         const rpcvers_t vers,           /* version number */
170         size_t sendsz,                  /* buffer recv size */
171         size_t recvsz,                  /* buffer send size */
172         int intrflag)                   /* interruptible */
173 {
174         CLIENT *cl;                     /* client handle */
175         struct ct_data *ct = NULL;      /* client handle */
176         struct timeval now;
177         struct rpc_msg call_msg;
178         static uint32_t disrupt;
179         struct __rpc_sockinfo si;
180         XDR xdrs;
181         int error, interrupted, one = 1, sleep_flag;
182         struct sockopt sopt;
183
184         if (disrupt == 0)
185                 disrupt = (uint32_t)(long)raddr;
186
187         cl = (CLIENT *)mem_alloc(sizeof (*cl));
188         ct = (struct ct_data *)mem_alloc(sizeof (*ct));
189
190         mtx_init(&ct->ct_lock, "ct->ct_lock", NULL, MTX_DEF);
191         ct->ct_threads = 0;
192         ct->ct_closing = FALSE;
193         ct->ct_closed = FALSE;
194         ct->ct_upcallrefs = 0;
195
196         if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) {
197                 error = soconnect(so, raddr, curthread);
198                 SOCK_LOCK(so);
199                 interrupted = 0;
200                 sleep_flag = PSOCK;
201                 if (intrflag != 0)
202                         sleep_flag |= (PCATCH | PBDRY);
203                 while ((so->so_state & SS_ISCONNECTING)
204                     && so->so_error == 0) {
205                         error = msleep(&so->so_timeo, SOCK_MTX(so),
206                             sleep_flag, "connec", 0);
207                         if (error) {
208                                 if (error == EINTR || error == ERESTART)
209                                         interrupted = 1;
210                                 break;
211                         }
212                 }
213                 if (error == 0) {
214                         error = so->so_error;
215                         so->so_error = 0;
216                 }
217                 SOCK_UNLOCK(so);
218                 if (error) {
219                         if (!interrupted)
220                                 so->so_state &= ~SS_ISCONNECTING;
221                         rpc_createerr.cf_stat = RPC_SYSTEMERROR;
222                         rpc_createerr.cf_error.re_errno = error;
223                         goto err;
224                 }
225         }
226
227         if (!__rpc_socket2sockinfo(so, &si)) {
228                 goto err;
229         }
230
231         if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
232                 bzero(&sopt, sizeof(sopt));
233                 sopt.sopt_dir = SOPT_SET;
234                 sopt.sopt_level = SOL_SOCKET;
235                 sopt.sopt_name = SO_KEEPALIVE;
236                 sopt.sopt_val = &one;
237                 sopt.sopt_valsize = sizeof(one);
238                 sosetopt(so, &sopt);
239         }
240
241         if (so->so_proto->pr_protocol == IPPROTO_TCP) {
242                 bzero(&sopt, sizeof(sopt));
243                 sopt.sopt_dir = SOPT_SET;
244                 sopt.sopt_level = IPPROTO_TCP;
245                 sopt.sopt_name = TCP_NODELAY;
246                 sopt.sopt_val = &one;
247                 sopt.sopt_valsize = sizeof(one);
248                 sosetopt(so, &sopt);
249         }
250
251         ct->ct_closeit = FALSE;
252
253         /*
254          * Set up private data struct
255          */
256         ct->ct_socket = so;
257         ct->ct_wait.tv_sec = -1;
258         ct->ct_wait.tv_usec = -1;
259         memcpy(&ct->ct_addr, raddr, raddr->sa_len);
260
261         /*
262          * Initialize call message
263          */
264         getmicrotime(&now);
265         ct->ct_xid = ((uint32_t)++disrupt) ^ __RPC_GETXID(&now);
266         call_msg.rm_xid = ct->ct_xid;
267         call_msg.rm_direction = CALL;
268         call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
269         call_msg.rm_call.cb_prog = (uint32_t)prog;
270         call_msg.rm_call.cb_vers = (uint32_t)vers;
271
272         /*
273          * pre-serialize the static part of the call msg and stash it away
274          */
275         xdrmem_create(&xdrs, ct->ct_mcallc, MCALL_MSG_SIZE,
276             XDR_ENCODE);
277         if (! xdr_callhdr(&xdrs, &call_msg)) {
278                 if (ct->ct_closeit) {
279                         soclose(ct->ct_socket);
280                 }
281                 goto err;
282         }
283         ct->ct_mpos = XDR_GETPOS(&xdrs);
284         XDR_DESTROY(&xdrs);
285         ct->ct_waitchan = "rpcrecv";
286         ct->ct_waitflag = 0;
287
288         /*
289          * Create a client handle which uses xdrrec for serialization
290          * and authnone for authentication.
291          */
292         sendsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsz);
293         recvsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsz);
294         error = soreserve(ct->ct_socket, sendsz, recvsz);
295         if (error != 0) {
296                 if (ct->ct_closeit) {
297                         soclose(ct->ct_socket);
298                 }
299                 goto err;
300         }
301         cl->cl_refs = 1;
302         cl->cl_ops = &clnt_vc_ops;
303         cl->cl_private = ct;
304         cl->cl_auth = authnone_create();
305
306         SOCKBUF_LOCK(&ct->ct_socket->so_rcv);
307         soupcall_set(ct->ct_socket, SO_RCV, clnt_vc_soupcall, ct);
308         SOCKBUF_UNLOCK(&ct->ct_socket->so_rcv);
309
310         ct->ct_record = NULL;
311         ct->ct_record_resid = 0;
312         TAILQ_INIT(&ct->ct_pending);
313         return (cl);
314
315 err:
316         if (cl) {
317                 if (ct) {
318                         mtx_destroy(&ct->ct_lock);
319                         mem_free(ct, sizeof (struct ct_data));
320                 }
321                 if (cl)
322                         mem_free(cl, sizeof (CLIENT));
323         }
324         return ((CLIENT *)NULL);
325 }
326
327 static enum clnt_stat
328 clnt_vc_call(
329         CLIENT          *cl,            /* client handle */
330         struct rpc_callextra *ext,      /* call metadata */
331         rpcproc_t       proc,           /* procedure number */
332         struct mbuf     *args,          /* pointer to args */
333         struct mbuf     **resultsp,     /* pointer to results */
334         struct timeval  utimeout)
335 {
336         struct ct_data *ct = (struct ct_data *) cl->cl_private;
337         AUTH *auth;
338         struct rpc_err *errp;
339         enum clnt_stat stat;
340         XDR xdrs;
341         struct rpc_msg reply_msg;
342         bool_t ok;
343         int nrefreshes = 2;             /* number of times to refresh cred */
344         struct timeval timeout;
345         uint32_t xid;
346         struct mbuf *mreq = NULL, *results;
347         struct ct_request *cr;
348         int error;
349
350         cr = malloc(sizeof(struct ct_request), M_RPC, M_WAITOK);
351
352         mtx_lock(&ct->ct_lock);
353
354         if (ct->ct_closing || ct->ct_closed) {
355                 mtx_unlock(&ct->ct_lock);
356                 free(cr, M_RPC);
357                 return (RPC_CANTSEND);
358         }
359         ct->ct_threads++;
360
361         if (ext) {
362                 auth = ext->rc_auth;
363                 errp = &ext->rc_err;
364         } else {
365                 auth = cl->cl_auth;
366                 errp = &ct->ct_error;
367         }
368
369         cr->cr_mrep = NULL;
370         cr->cr_error = 0;
371
372         if (ct->ct_wait.tv_usec == -1) {
373                 timeout = utimeout;     /* use supplied timeout */
374         } else {
375                 timeout = ct->ct_wait;  /* use default timeout */
376         }
377
378 call_again:
379         mtx_assert(&ct->ct_lock, MA_OWNED);
380
381         ct->ct_xid++;
382         xid = ct->ct_xid;
383
384         mtx_unlock(&ct->ct_lock);
385
386         /*
387          * Leave space to pre-pend the record mark.
388          */
389         MGETHDR(mreq, M_WAIT, MT_DATA);
390         mreq->m_data += sizeof(uint32_t);
391         KASSERT(ct->ct_mpos + sizeof(uint32_t) <= MHLEN,
392             ("RPC header too big"));
393         bcopy(ct->ct_mcallc, mreq->m_data, ct->ct_mpos);
394         mreq->m_len = ct->ct_mpos;
395
396         /*
397          * The XID is the first thing in the request.
398          */
399         *mtod(mreq, uint32_t *) = htonl(xid);
400
401         xdrmbuf_create(&xdrs, mreq, XDR_ENCODE);
402
403         errp->re_status = stat = RPC_SUCCESS;
404
405         if ((! XDR_PUTINT32(&xdrs, &proc)) ||
406             (! AUTH_MARSHALL(auth, xid, &xdrs,
407                 m_copym(args, 0, M_COPYALL, M_WAITOK)))) {
408                 errp->re_status = stat = RPC_CANTENCODEARGS;
409                 mtx_lock(&ct->ct_lock);
410                 goto out;
411         }
412         mreq->m_pkthdr.len = m_length(mreq, NULL);
413
414         /*
415          * Prepend a record marker containing the packet length.
416          */
417         M_PREPEND(mreq, sizeof(uint32_t), M_WAIT);
418         *mtod(mreq, uint32_t *) =
419                 htonl(0x80000000 | (mreq->m_pkthdr.len - sizeof(uint32_t)));
420
421         cr->cr_xid = xid;
422         mtx_lock(&ct->ct_lock);
423         /*
424          * Check to see if the other end has already started to close down
425          * the connection. The upcall will have set ct_error.re_status
426          * to RPC_CANTRECV if this is the case.
427          * If the other end starts to close down the connection after this
428          * point, it will be detected later when cr_error is checked,
429          * since the request is in the ct_pending queue.
430          */
431         if (ct->ct_error.re_status == RPC_CANTRECV) {
432                 if (errp != &ct->ct_error) {
433                         errp->re_errno = ct->ct_error.re_errno;
434                         errp->re_status = RPC_CANTRECV;
435                 }
436                 stat = RPC_CANTRECV;
437                 goto out;
438         }
439         TAILQ_INSERT_TAIL(&ct->ct_pending, cr, cr_link);
440         mtx_unlock(&ct->ct_lock);
441
442         /*
443          * sosend consumes mreq.
444          */
445         error = sosend(ct->ct_socket, NULL, NULL, mreq, NULL, 0, curthread);
446         mreq = NULL;
447         if (error == EMSGSIZE) {
448                 SOCKBUF_LOCK(&ct->ct_socket->so_snd);
449                 sbwait(&ct->ct_socket->so_snd);
450                 SOCKBUF_UNLOCK(&ct->ct_socket->so_snd);
451                 AUTH_VALIDATE(auth, xid, NULL, NULL);
452                 mtx_lock(&ct->ct_lock);
453                 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
454                 goto call_again;
455         }
456
457         reply_msg.acpted_rply.ar_verf.oa_flavor = AUTH_NULL;
458         reply_msg.acpted_rply.ar_verf.oa_base = cr->cr_verf;
459         reply_msg.acpted_rply.ar_verf.oa_length = 0;
460         reply_msg.acpted_rply.ar_results.where = NULL;
461         reply_msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void;
462
463         mtx_lock(&ct->ct_lock);
464         if (error) {
465                 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
466                 errp->re_errno = error;
467                 errp->re_status = stat = RPC_CANTSEND;
468                 goto out;
469         }
470
471         /*
472          * Check to see if we got an upcall while waiting for the
473          * lock. In both these cases, the request has been removed
474          * from ct->ct_pending.
475          */
476         if (cr->cr_error) {
477                 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
478                 errp->re_errno = cr->cr_error;
479                 errp->re_status = stat = RPC_CANTRECV;
480                 goto out;
481         }
482         if (cr->cr_mrep) {
483                 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
484                 goto got_reply;
485         }
486
487         /*
488          * Hack to provide rpc-based message passing
489          */
490         if (timeout.tv_sec == 0 && timeout.tv_usec == 0) {
491                 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
492                 errp->re_status = stat = RPC_TIMEDOUT;
493                 goto out;
494         }
495
496         error = msleep(cr, &ct->ct_lock, ct->ct_waitflag, ct->ct_waitchan,
497             tvtohz(&timeout));
498
499         TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
500
501         if (error) {
502                 /*
503                  * The sleep returned an error so our request is still
504                  * on the list. Turn the error code into an
505                  * appropriate client status.
506                  */
507                 errp->re_errno = error;
508                 switch (error) {
509                 case EINTR:
510                 case ERESTART:
511                         stat = RPC_INTR;
512                         break;
513                 case EWOULDBLOCK:
514                         stat = RPC_TIMEDOUT;
515                         break;
516                 default:
517                         stat = RPC_CANTRECV;
518                 }
519                 errp->re_status = stat;
520                 goto out;
521         } else {
522                 /*
523                  * We were woken up by the upcall.  If the
524                  * upcall had a receive error, report that,
525                  * otherwise we have a reply.
526                  */
527                 if (cr->cr_error) {
528                         errp->re_errno = cr->cr_error;
529                         errp->re_status = stat = RPC_CANTRECV;
530                         goto out;
531                 }
532         }
533
534 got_reply:
535         /*
536          * Now decode and validate the response. We need to drop the
537          * lock since xdr_replymsg may end up sleeping in malloc.
538          */
539         mtx_unlock(&ct->ct_lock);
540
541         if (ext && ext->rc_feedback)
542                 ext->rc_feedback(FEEDBACK_OK, proc, ext->rc_feedback_arg);
543
544         xdrmbuf_create(&xdrs, cr->cr_mrep, XDR_DECODE);
545         ok = xdr_replymsg(&xdrs, &reply_msg);
546         cr->cr_mrep = NULL;
547
548         if (ok) {
549                 if ((reply_msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
550                     (reply_msg.acpted_rply.ar_stat == SUCCESS))
551                         errp->re_status = stat = RPC_SUCCESS;
552                 else
553                         stat = _seterr_reply(&reply_msg, errp);
554
555                 if (stat == RPC_SUCCESS) {
556                         results = xdrmbuf_getall(&xdrs);
557                         if (!AUTH_VALIDATE(auth, xid,
558                                 &reply_msg.acpted_rply.ar_verf,
559                                 &results)) {
560                                 errp->re_status = stat = RPC_AUTHERROR;
561                                 errp->re_why = AUTH_INVALIDRESP;
562                         } else {
563                                 KASSERT(results,
564                                     ("auth validated but no result"));
565                                 *resultsp = results;
566                         }
567                 }               /* end successful completion */
568                 /*
569                  * If unsuccesful AND error is an authentication error
570                  * then refresh credentials and try again, else break
571                  */
572                 else if (stat == RPC_AUTHERROR)
573                         /* maybe our credentials need to be refreshed ... */
574                         if (nrefreshes > 0 &&
575                             AUTH_REFRESH(auth, &reply_msg)) {
576                                 nrefreshes--;
577                                 XDR_DESTROY(&xdrs);
578                                 mtx_lock(&ct->ct_lock);
579                                 goto call_again;
580                         }
581                 /* end of unsuccessful completion */
582         }       /* end of valid reply message */
583         else {
584                 errp->re_status = stat = RPC_CANTDECODERES;
585         }
586         XDR_DESTROY(&xdrs);
587         mtx_lock(&ct->ct_lock);
588 out:
589         mtx_assert(&ct->ct_lock, MA_OWNED);
590
591         KASSERT(stat != RPC_SUCCESS || *resultsp,
592             ("RPC_SUCCESS without reply"));
593
594         if (mreq)
595                 m_freem(mreq);
596         if (cr->cr_mrep)
597                 m_freem(cr->cr_mrep);
598
599         ct->ct_threads--;
600         if (ct->ct_closing)
601                 wakeup(ct);
602                 
603         mtx_unlock(&ct->ct_lock);
604
605         if (auth && stat != RPC_SUCCESS)
606                 AUTH_VALIDATE(auth, xid, NULL, NULL);
607
608         free(cr, M_RPC);
609
610         return (stat);
611 }
612
613 static void
614 clnt_vc_geterr(CLIENT *cl, struct rpc_err *errp)
615 {
616         struct ct_data *ct = (struct ct_data *) cl->cl_private;
617
618         *errp = ct->ct_error;
619 }
620
621 static bool_t
622 clnt_vc_freeres(CLIENT *cl, xdrproc_t xdr_res, void *res_ptr)
623 {
624         XDR xdrs;
625         bool_t dummy;
626
627         xdrs.x_op = XDR_FREE;
628         dummy = (*xdr_res)(&xdrs, res_ptr);
629
630         return (dummy);
631 }
632
633 /*ARGSUSED*/
634 static void
635 clnt_vc_abort(CLIENT *cl)
636 {
637 }
638
639 static bool_t
640 clnt_vc_control(CLIENT *cl, u_int request, void *info)
641 {
642         struct ct_data *ct = (struct ct_data *)cl->cl_private;
643         void *infop = info;
644
645         mtx_lock(&ct->ct_lock);
646
647         switch (request) {
648         case CLSET_FD_CLOSE:
649                 ct->ct_closeit = TRUE;
650                 mtx_unlock(&ct->ct_lock);
651                 return (TRUE);
652         case CLSET_FD_NCLOSE:
653                 ct->ct_closeit = FALSE;
654                 mtx_unlock(&ct->ct_lock);
655                 return (TRUE);
656         default:
657                 break;
658         }
659
660         /* for other requests which use info */
661         if (info == NULL) {
662                 mtx_unlock(&ct->ct_lock);
663                 return (FALSE);
664         }
665         switch (request) {
666         case CLSET_TIMEOUT:
667                 if (time_not_ok((struct timeval *)info)) {
668                         mtx_unlock(&ct->ct_lock);
669                         return (FALSE);
670                 }
671                 ct->ct_wait = *(struct timeval *)infop;
672                 break;
673         case CLGET_TIMEOUT:
674                 *(struct timeval *)infop = ct->ct_wait;
675                 break;
676         case CLGET_SERVER_ADDR:
677                 (void) memcpy(info, &ct->ct_addr, (size_t)ct->ct_addr.ss_len);
678                 break;
679         case CLGET_SVC_ADDR:
680                 /*
681                  * Slightly different semantics to userland - we use
682                  * sockaddr instead of netbuf.
683                  */
684                 memcpy(info, &ct->ct_addr, ct->ct_addr.ss_len);
685                 break;
686         case CLSET_SVC_ADDR:            /* set to new address */
687                 mtx_unlock(&ct->ct_lock);
688                 return (FALSE);
689         case CLGET_XID:
690                 *(uint32_t *)info = ct->ct_xid;
691                 break;
692         case CLSET_XID:
693                 /* This will set the xid of the NEXT call */
694                 /* decrement by 1 as clnt_vc_call() increments once */
695                 ct->ct_xid = *(uint32_t *)info - 1;
696                 break;
697         case CLGET_VERS:
698                 /*
699                  * This RELIES on the information that, in the call body,
700                  * the version number field is the fifth field from the
701                  * begining of the RPC header. MUST be changed if the
702                  * call_struct is changed
703                  */
704                 *(uint32_t *)info =
705                     ntohl(*(uint32_t *)(void *)(ct->ct_mcallc +
706                     4 * BYTES_PER_XDR_UNIT));
707                 break;
708
709         case CLSET_VERS:
710                 *(uint32_t *)(void *)(ct->ct_mcallc +
711                     4 * BYTES_PER_XDR_UNIT) =
712                     htonl(*(uint32_t *)info);
713                 break;
714
715         case CLGET_PROG:
716                 /*
717                  * This RELIES on the information that, in the call body,
718                  * the program number field is the fourth field from the
719                  * begining of the RPC header. MUST be changed if the
720                  * call_struct is changed
721                  */
722                 *(uint32_t *)info =
723                     ntohl(*(uint32_t *)(void *)(ct->ct_mcallc +
724                     3 * BYTES_PER_XDR_UNIT));
725                 break;
726
727         case CLSET_PROG:
728                 *(uint32_t *)(void *)(ct->ct_mcallc +
729                     3 * BYTES_PER_XDR_UNIT) =
730                     htonl(*(uint32_t *)info);
731                 break;
732
733         case CLSET_WAITCHAN:
734                 ct->ct_waitchan = (const char *)info;
735                 break;
736
737         case CLGET_WAITCHAN:
738                 *(const char **) info = ct->ct_waitchan;
739                 break;
740
741         case CLSET_INTERRUPTIBLE:
742                 if (*(int *) info)
743                         ct->ct_waitflag = PCATCH | PBDRY;
744                 else
745                         ct->ct_waitflag = 0;
746                 break;
747
748         case CLGET_INTERRUPTIBLE:
749                 if (ct->ct_waitflag)
750                         *(int *) info = TRUE;
751                 else
752                         *(int *) info = FALSE;
753                 break;
754
755         default:
756                 mtx_unlock(&ct->ct_lock);
757                 return (FALSE);
758         }
759
760         mtx_unlock(&ct->ct_lock);
761         return (TRUE);
762 }
763
764 static void
765 clnt_vc_close(CLIENT *cl)
766 {
767         struct ct_data *ct = (struct ct_data *) cl->cl_private;
768         struct ct_request *cr;
769
770         mtx_lock(&ct->ct_lock);
771
772         if (ct->ct_closed) {
773                 mtx_unlock(&ct->ct_lock);
774                 return;
775         }
776
777         if (ct->ct_closing) {
778                 while (ct->ct_closing)
779                         msleep(ct, &ct->ct_lock, 0, "rpcclose", 0);
780                 KASSERT(ct->ct_closed, ("client should be closed"));
781                 mtx_unlock(&ct->ct_lock);
782                 return;
783         }
784
785         if (ct->ct_socket) {
786                 ct->ct_closing = TRUE;
787                 mtx_unlock(&ct->ct_lock);
788
789                 SOCKBUF_LOCK(&ct->ct_socket->so_rcv);
790                 soupcall_clear(ct->ct_socket, SO_RCV);
791                 clnt_vc_upcallsdone(ct);
792                 SOCKBUF_UNLOCK(&ct->ct_socket->so_rcv);
793
794                 /*
795                  * Abort any pending requests and wait until everyone
796                  * has finished with clnt_vc_call.
797                  */
798                 mtx_lock(&ct->ct_lock);
799                 TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) {
800                         cr->cr_xid = 0;
801                         cr->cr_error = ESHUTDOWN;
802                         wakeup(cr);
803                 }
804
805                 while (ct->ct_threads)
806                         msleep(ct, &ct->ct_lock, 0, "rpcclose", 0);
807         }
808
809         ct->ct_closing = FALSE;
810         ct->ct_closed = TRUE;
811         mtx_unlock(&ct->ct_lock);
812         wakeup(ct);
813 }
814
815 static void
816 clnt_vc_destroy(CLIENT *cl)
817 {
818         struct ct_data *ct = (struct ct_data *) cl->cl_private;
819         struct socket *so = NULL;
820
821         clnt_vc_close(cl);
822
823         mtx_lock(&ct->ct_lock);
824
825         if (ct->ct_socket) {
826                 if (ct->ct_closeit) {
827                         so = ct->ct_socket;
828                 }
829         }
830
831         mtx_unlock(&ct->ct_lock);
832
833         mtx_destroy(&ct->ct_lock);
834         if (so) {
835                 soshutdown(so, SHUT_WR);
836                 soclose(so);
837         }
838         mem_free(ct, sizeof(struct ct_data));
839         if (cl->cl_netid && cl->cl_netid[0])
840                 mem_free(cl->cl_netid, strlen(cl->cl_netid) +1);
841         if (cl->cl_tp && cl->cl_tp[0])
842                 mem_free(cl->cl_tp, strlen(cl->cl_tp) +1);
843         mem_free(cl, sizeof(CLIENT));
844 }
845
846 /*
847  * Make sure that the time is not garbage.   -1 value is disallowed.
848  * Note this is different from time_not_ok in clnt_dg.c
849  */
850 static bool_t
851 time_not_ok(struct timeval *t)
852 {
853         return (t->tv_sec <= -1 || t->tv_sec > 100000000 ||
854                 t->tv_usec <= -1 || t->tv_usec > 1000000);
855 }
856
857 int
858 clnt_vc_soupcall(struct socket *so, void *arg, int waitflag)
859 {
860         struct ct_data *ct = (struct ct_data *) arg;
861         struct uio uio;
862         struct mbuf *m;
863         struct ct_request *cr;
864         int error, rcvflag, foundreq;
865         uint32_t xid, header;
866         bool_t do_read;
867
868         ct->ct_upcallrefs++;
869         uio.uio_td = curthread;
870         do {
871                 /*
872                  * If ct_record_resid is zero, we are waiting for a
873                  * record mark.
874                  */
875                 if (ct->ct_record_resid == 0) {
876
877                         /*
878                          * Make sure there is either a whole record
879                          * mark in the buffer or there is some other
880                          * error condition
881                          */
882                         do_read = FALSE;
883                         if (so->so_rcv.sb_cc >= sizeof(uint32_t)
884                             || (so->so_rcv.sb_state & SBS_CANTRCVMORE)
885                             || so->so_error)
886                                 do_read = TRUE;
887
888                         if (!do_read)
889                                 break;
890
891                         SOCKBUF_UNLOCK(&so->so_rcv);
892                         uio.uio_resid = sizeof(uint32_t);
893                         m = NULL;
894                         rcvflag = MSG_DONTWAIT | MSG_SOCALLBCK;
895                         error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag);
896                         SOCKBUF_LOCK(&so->so_rcv);
897
898                         if (error == EWOULDBLOCK)
899                                 break;
900                         
901                         /*
902                          * If there was an error, wake up all pending
903                          * requests.
904                          */
905                         if (error || uio.uio_resid > 0) {
906                         wakeup_all:
907                                 mtx_lock(&ct->ct_lock);
908                                 if (!error) {
909                                         /*
910                                          * We must have got EOF trying
911                                          * to read from the stream.
912                                          */
913                                         error = ECONNRESET;
914                                 }
915                                 ct->ct_error.re_status = RPC_CANTRECV;
916                                 ct->ct_error.re_errno = error;
917                                 TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) {
918                                         cr->cr_error = error;
919                                         wakeup(cr);
920                                 }
921                                 mtx_unlock(&ct->ct_lock);
922                                 break;
923                         }
924                         m_copydata(m, 0, sizeof(uint32_t), (char *)&header);
925                         header = ntohl(header);
926                         ct->ct_record = NULL;
927                         ct->ct_record_resid = header & 0x7fffffff;
928                         ct->ct_record_eor = ((header & 0x80000000) != 0);
929                         m_freem(m);
930                 } else {
931                         /*
932                          * Wait until the socket has the whole record
933                          * buffered.
934                          */
935                         do_read = FALSE;
936                         if (so->so_rcv.sb_cc >= ct->ct_record_resid
937                             || (so->so_rcv.sb_state & SBS_CANTRCVMORE)
938                             || so->so_error)
939                                 do_read = TRUE;
940
941                         if (!do_read)
942                                 break;
943
944                         /*
945                          * We have the record mark. Read as much as
946                          * the socket has buffered up to the end of
947                          * this record.
948                          */
949                         SOCKBUF_UNLOCK(&so->so_rcv);
950                         uio.uio_resid = ct->ct_record_resid;
951                         m = NULL;
952                         rcvflag = MSG_DONTWAIT | MSG_SOCALLBCK;
953                         error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag);
954                         SOCKBUF_LOCK(&so->so_rcv);
955
956                         if (error == EWOULDBLOCK)
957                                 break;
958
959                         if (error || uio.uio_resid == ct->ct_record_resid)
960                                 goto wakeup_all;
961
962                         /*
963                          * If we have part of the record already,
964                          * chain this bit onto the end.
965                          */
966                         if (ct->ct_record)
967                                 m_last(ct->ct_record)->m_next = m;
968                         else
969                                 ct->ct_record = m;
970
971                         ct->ct_record_resid = uio.uio_resid;
972
973                         /*
974                          * If we have the entire record, see if we can
975                          * match it to a request.
976                          */
977                         if (ct->ct_record_resid == 0
978                             && ct->ct_record_eor) {
979                                 /*
980                                  * The XID is in the first uint32_t of
981                                  * the reply.
982                                  */
983                                 if (ct->ct_record->m_len < sizeof(xid) &&
984                                     m_length(ct->ct_record, NULL) <
985                                     sizeof(xid)) {
986                                         m_freem(ct->ct_record);
987                                         break;
988                                 }
989                                 m_copydata(ct->ct_record, 0, sizeof(xid),
990                                     (char *)&xid);
991                                 xid = ntohl(xid);
992
993                                 mtx_lock(&ct->ct_lock);
994                                 foundreq = 0;
995                                 TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) {
996                                         if (cr->cr_xid == xid) {
997                                                 /*
998                                                  * This one
999                                                  * matches. We leave
1000                                                  * the reply mbuf in
1001                                                  * cr->cr_mrep. Set
1002                                                  * the XID to zero so
1003                                                  * that we will ignore
1004                                                  * any duplicaed
1005                                                  * replies.
1006                                                  */
1007                                                 cr->cr_xid = 0;
1008                                                 cr->cr_mrep = ct->ct_record;
1009                                                 cr->cr_error = 0;
1010                                                 foundreq = 1;
1011                                                 wakeup(cr);
1012                                                 break;
1013                                         }
1014                                 }
1015                                 mtx_unlock(&ct->ct_lock);
1016
1017                                 if (!foundreq)
1018                                         m_freem(ct->ct_record);
1019                                 ct->ct_record = NULL;
1020                         }
1021                 }
1022         } while (m);
1023         ct->ct_upcallrefs--;
1024         if (ct->ct_upcallrefs < 0)
1025                 panic("rpcvc upcall refcnt");
1026         if (ct->ct_upcallrefs == 0)
1027                 wakeup(&ct->ct_upcallrefs);
1028         return (SU_OK);
1029 }
1030
1031 /*
1032  * Wait for all upcalls in progress to complete.
1033  */
1034 static void
1035 clnt_vc_upcallsdone(struct ct_data *ct)
1036 {
1037
1038         SOCKBUF_LOCK_ASSERT(&ct->ct_socket->so_rcv);
1039
1040         while (ct->ct_upcallrefs > 0)
1041                 (void) msleep(&ct->ct_upcallrefs,
1042                     SOCKBUF_MTX(&ct->ct_socket->so_rcv), 0, "rpcvcup", 0);
1043 }