1 /* $NetBSD: svc.c,v 1.21 2000/07/06 03:10:35 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2009, Sun Microsystems, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * - Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 * - Neither the name of Sun Microsystems, Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived
16 * from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #if defined(LIBC_SCCS) && !defined(lint)
32 static char *sccsid2 = "@(#)svc.c 1.44 88/02/08 Copyr 1984 Sun Micro";
33 static char *sccsid = "@(#)svc.c 2.4 88/08/11 4.0 RPCSRC";
34 #endif
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD: stable/10/lib/libc/rpc/svc.c 318327 2017-05-15 23:13:49Z brooks $");
37
38 /*
39 * svc.c, Server-side remote procedure call interface.
40 *
41 * There are two sets of procedures here. The xprt routines are
42 * for handling transport handles. The svc routines handle the
43 * list of service routines.
44 *
45 * Copyright (C) 1984, Sun Microsystems, Inc.
46 */
47
48 #include "namespace.h"
49 #include "reentrant.h"
50 #include <sys/types.h>
51 #include <sys/poll.h>
52 #include <assert.h>
53 #include <errno.h>
54 #include <stdlib.h>
55 #include <string.h>
56
57 #include <rpc/rpc.h>
58 #ifdef PORTMAP
59 #include <rpc/pmap_clnt.h>
60 #endif /* PORTMAP */
61 #include "un-namespace.h"
62
63 #include "rpc_com.h"
64 #include "mt_misc.h"
65
66 #define RQCRED_SIZE 400 /* this size is excessive */
67
68 #define SVC_VERSQUIET 0x0001 /* keep quiet about vers mismatch */
69 #define version_keepquiet(xp) (SVC_EXT(xp)->xp_flags & SVC_VERSQUIET)
70
71 #define max(a, b) (a > b ? a : b)
72
73 /*
74 * The services list
75 * Each entry represents a set of procedures (an rpc program).
76 * The dispatch routine takes request structs and runs the
77 * apropriate procedure.
78 */
79 static struct svc_callout {
80 struct svc_callout *sc_next;
81 rpcprog_t sc_prog;
82 rpcvers_t sc_vers;
83 char *sc_netid;
84 void (*sc_dispatch)(struct svc_req *, SVCXPRT *);
85 } *svc_head;
86
87 SVCXPRT **__svc_xports;
88 int __svc_maxrec;
89
90 static struct svc_callout *svc_find(rpcprog_t, rpcvers_t,
91 struct svc_callout **, char *);
92 static void __xprt_do_unregister (SVCXPRT *xprt, bool_t dolock);
93
94 /* *************** SVCXPRT related stuff **************** */
95
96 /*
97 * Activate a transport handle.
98 */
99 void
xprt_register(SVCXPRT * xprt)100 xprt_register(SVCXPRT *xprt)
101 {
102 int sock;
103
104 assert(xprt != NULL);
105
106 sock = xprt->xp_fd;
107
108 rwlock_wrlock(&svc_fd_lock);
109 if (__svc_xports == NULL) {
110 __svc_xports = (SVCXPRT **)
111 mem_alloc((FD_SETSIZE + 1) * sizeof(SVCXPRT *));
112 if (__svc_xports == NULL) {
113 rwlock_unlock(&svc_fd_lock);
114 return;
115 }
116 memset(__svc_xports, '\0', (FD_SETSIZE + 1) * sizeof(SVCXPRT *));
117 }
118 if (sock < FD_SETSIZE) {
119 __svc_xports[sock] = xprt;
120 FD_SET(sock, &svc_fdset);
121 svc_maxfd = max(svc_maxfd, sock);
122 } else if (sock == FD_SETSIZE)
123 __svc_xports[sock] = xprt;
124 rwlock_unlock(&svc_fd_lock);
125 }
126
127 void
xprt_unregister(SVCXPRT * xprt)128 xprt_unregister(SVCXPRT *xprt)
129 {
130 __xprt_do_unregister(xprt, TRUE);
131 }
132
133 void
__xprt_unregister_unlocked(SVCXPRT * xprt)134 __xprt_unregister_unlocked(SVCXPRT *xprt)
135 {
136 __xprt_do_unregister(xprt, FALSE);
137 }
138
139 /*
140 * De-activate a transport handle.
141 */
142 static void
__xprt_do_unregister(SVCXPRT * xprt,bool_t dolock)143 __xprt_do_unregister(SVCXPRT *xprt, bool_t dolock)
144 {
145 int sock;
146
147 assert(xprt != NULL);
148
149 sock = xprt->xp_fd;
150
151 if (dolock)
152 rwlock_wrlock(&svc_fd_lock);
153 if ((sock < FD_SETSIZE) && (__svc_xports[sock] == xprt)) {
154 __svc_xports[sock] = NULL;
155 FD_CLR(sock, &svc_fdset);
156 if (sock >= svc_maxfd) {
157 for (svc_maxfd--; svc_maxfd>=0; svc_maxfd--)
158 if (__svc_xports[svc_maxfd])
159 break;
160 }
161 } else if ((sock == FD_SETSIZE) && (__svc_xports[sock] == xprt))
162 __svc_xports[sock] = NULL;
163 if (dolock)
164 rwlock_unlock(&svc_fd_lock);
165 }
166
167 /*
168 * Add a service program to the callout list.
169 * The dispatch routine will be called when a rpc request for this
170 * program number comes in.
171 */
172 bool_t
svc_reg(SVCXPRT * xprt,const rpcprog_t prog,const rpcvers_t vers,void (* dispatch)(struct svc_req *,SVCXPRT *),const struct netconfig * nconf)173 svc_reg(SVCXPRT *xprt, const rpcprog_t prog, const rpcvers_t vers,
174 void (*dispatch)(struct svc_req *, SVCXPRT *),
175 const struct netconfig *nconf)
176 {
177 bool_t dummy;
178 struct svc_callout *prev;
179 struct svc_callout *s;
180 struct netconfig *tnconf;
181 char *netid = NULL;
182 int flag = 0;
183
184 /* VARIABLES PROTECTED BY svc_lock: s, prev, svc_head */
185
186 if (xprt->xp_netid) {
187 netid = strdup(xprt->xp_netid);
188 flag = 1;
189 } else if (nconf && nconf->nc_netid) {
190 netid = strdup(nconf->nc_netid);
191 flag = 1;
192 } else if ((tnconf = __rpcgettp(xprt->xp_fd)) != NULL) {
193 netid = strdup(tnconf->nc_netid);
194 flag = 1;
195 freenetconfigent(tnconf);
196 } /* must have been created with svc_raw_create */
197 if ((netid == NULL) && (flag == 1)) {
198 return (FALSE);
199 }
200
201 rwlock_wrlock(&svc_lock);
202 if ((s = svc_find(prog, vers, &prev, netid)) != NULL) {
203 free(netid);
204 if (s->sc_dispatch == dispatch)
205 goto rpcb_it; /* he is registering another xptr */
206 rwlock_unlock(&svc_lock);
207 return (FALSE);
208 }
209 s = mem_alloc(sizeof (struct svc_callout));
210 if (s == NULL) {
211 free(netid);
212 rwlock_unlock(&svc_lock);
213 return (FALSE);
214 }
215
216 s->sc_prog = prog;
217 s->sc_vers = vers;
218 s->sc_dispatch = dispatch;
219 s->sc_netid = netid;
220 s->sc_next = svc_head;
221 svc_head = s;
222
223 if ((xprt->xp_netid == NULL) && (flag == 1) && netid)
224 ((SVCXPRT *) xprt)->xp_netid = strdup(netid);
225
226 rpcb_it:
227 rwlock_unlock(&svc_lock);
228 /* now register the information with the local binder service */
229 if (nconf) {
230 /*LINTED const castaway*/
231 dummy = rpcb_set(prog, vers, (struct netconfig *) nconf,
232 &((SVCXPRT *) xprt)->xp_ltaddr);
233 return (dummy);
234 }
235 return (TRUE);
236 }
237
238 /*
239 * Remove a service program from the callout list.
240 */
241 void
svc_unreg(const rpcprog_t prog,const rpcvers_t vers)242 svc_unreg(const rpcprog_t prog, const rpcvers_t vers)
243 {
244 struct svc_callout *prev;
245 struct svc_callout *s;
246
247 /* unregister the information anyway */
248 (void) rpcb_unset(prog, vers, NULL);
249 rwlock_wrlock(&svc_lock);
250 while ((s = svc_find(prog, vers, &prev, NULL)) != NULL) {
251 if (prev == NULL) {
252 svc_head = s->sc_next;
253 } else {
254 prev->sc_next = s->sc_next;
255 }
256 s->sc_next = NULL;
257 if (s->sc_netid)
258 mem_free(s->sc_netid, sizeof (s->sc_netid) + 1);
259 mem_free(s, sizeof (struct svc_callout));
260 }
261 rwlock_unlock(&svc_lock);
262 }
263
264 /* ********************** CALLOUT list related stuff ************* */
265
266 #ifdef PORTMAP
267 /*
268 * Add a service program to the callout list.
269 * The dispatch routine will be called when a rpc request for this
270 * program number comes in.
271 */
272 bool_t
svc_register(SVCXPRT * xprt,u_long prog,u_long vers,void (* dispatch)(struct svc_req *,SVCXPRT *),int protocol)273 svc_register(SVCXPRT *xprt, u_long prog, u_long vers,
274 void (*dispatch)(struct svc_req *, SVCXPRT *),
275 int protocol)
276 {
277 struct svc_callout *prev;
278 struct svc_callout *s;
279
280 assert(xprt != NULL);
281 assert(dispatch != NULL);
282
283 if ((s = svc_find((rpcprog_t)prog, (rpcvers_t)vers, &prev, NULL)) !=
284 NULL) {
285 if (s->sc_dispatch == dispatch)
286 goto pmap_it; /* he is registering another xptr */
287 return (FALSE);
288 }
289 s = mem_alloc(sizeof(struct svc_callout));
290 if (s == NULL) {
291 return (FALSE);
292 }
293 s->sc_prog = (rpcprog_t)prog;
294 s->sc_vers = (rpcvers_t)vers;
295 s->sc_dispatch = dispatch;
296 s->sc_next = svc_head;
297 svc_head = s;
298 pmap_it:
299 /* now register the information with the local binder service */
300 if (protocol) {
301 return (pmap_set(prog, vers, protocol, xprt->xp_port));
302 }
303 return (TRUE);
304 }
305
306 /*
307 * Remove a service program from the callout list.
308 */
309 void
svc_unregister(u_long prog,u_long vers)310 svc_unregister(u_long prog, u_long vers)
311 {
312 struct svc_callout *prev;
313 struct svc_callout *s;
314
315 if ((s = svc_find((rpcprog_t)prog, (rpcvers_t)vers, &prev, NULL)) ==
316 NULL)
317 return;
318 if (prev == NULL) {
319 svc_head = s->sc_next;
320 } else {
321 prev->sc_next = s->sc_next;
322 }
323 s->sc_next = NULL;
324 mem_free(s, sizeof(struct svc_callout));
325 /* now unregister the information with the local binder service */
326 (void)pmap_unset(prog, vers);
327 }
328 #endif /* PORTMAP */
329
330 /*
331 * Search the callout list for a program number, return the callout
332 * struct.
333 */
334 static struct svc_callout *
svc_find(rpcprog_t prog,rpcvers_t vers,struct svc_callout ** prev,char * netid)335 svc_find(rpcprog_t prog, rpcvers_t vers, struct svc_callout **prev,
336 char *netid)
337 {
338 struct svc_callout *s, *p;
339
340 assert(prev != NULL);
341
342 p = NULL;
343 for (s = svc_head; s != NULL; s = s->sc_next) {
344 if (((s->sc_prog == prog) && (s->sc_vers == vers)) &&
345 ((netid == NULL) || (s->sc_netid == NULL) ||
346 (strcmp(netid, s->sc_netid) == 0)))
347 break;
348 p = s;
349 }
350 *prev = p;
351 return (s);
352 }
353
354 /* ******************* REPLY GENERATION ROUTINES ************ */
355
356 /*
357 * Send a reply to an rpc request
358 */
359 bool_t
svc_sendreply(SVCXPRT * xprt,xdrproc_t xdr_results,void * xdr_location)360 svc_sendreply(SVCXPRT *xprt, xdrproc_t xdr_results,
361 void * xdr_location)
362 {
363 struct rpc_msg rply;
364
365 assert(xprt != NULL);
366
367 rply.rm_direction = REPLY;
368 rply.rm_reply.rp_stat = MSG_ACCEPTED;
369 rply.acpted_rply.ar_verf = xprt->xp_verf;
370 rply.acpted_rply.ar_stat = SUCCESS;
371 rply.acpted_rply.ar_results.where = xdr_location;
372 rply.acpted_rply.ar_results.proc = xdr_results;
373 return (SVC_REPLY(xprt, &rply));
374 }
375
376 /*
377 * No procedure error reply
378 */
379 void
svcerr_noproc(SVCXPRT * xprt)380 svcerr_noproc(SVCXPRT *xprt)
381 {
382 struct rpc_msg rply;
383
384 assert(xprt != NULL);
385
386 rply.rm_direction = REPLY;
387 rply.rm_reply.rp_stat = MSG_ACCEPTED;
388 rply.acpted_rply.ar_verf = xprt->xp_verf;
389 rply.acpted_rply.ar_stat = PROC_UNAVAIL;
390 SVC_REPLY(xprt, &rply);
391 }
392
393 /*
394 * Can't decode args error reply
395 */
396 void
svcerr_decode(SVCXPRT * xprt)397 svcerr_decode(SVCXPRT *xprt)
398 {
399 struct rpc_msg rply;
400
401 assert(xprt != NULL);
402
403 rply.rm_direction = REPLY;
404 rply.rm_reply.rp_stat = MSG_ACCEPTED;
405 rply.acpted_rply.ar_verf = xprt->xp_verf;
406 rply.acpted_rply.ar_stat = GARBAGE_ARGS;
407 SVC_REPLY(xprt, &rply);
408 }
409
410 /*
411 * Some system error
412 */
413 void
svcerr_systemerr(SVCXPRT * xprt)414 svcerr_systemerr(SVCXPRT *xprt)
415 {
416 struct rpc_msg rply;
417
418 assert(xprt != NULL);
419
420 rply.rm_direction = REPLY;
421 rply.rm_reply.rp_stat = MSG_ACCEPTED;
422 rply.acpted_rply.ar_verf = xprt->xp_verf;
423 rply.acpted_rply.ar_stat = SYSTEM_ERR;
424 SVC_REPLY(xprt, &rply);
425 }
426
427 #if 0
428 /*
429 * Tell RPC package to not complain about version errors to the client. This
430 * is useful when revving broadcast protocols that sit on a fixed address.
431 * There is really one (or should be only one) example of this kind of
432 * protocol: the portmapper (or rpc binder).
433 */
434 void
435 __svc_versquiet_on(SVCXPRT *xprt)
436 {
437
438 SVC_EXT(xprt)->xp_flags |= SVC_VERSQUIET;
439 }
440
441 void
442 __svc_versquiet_off(SVCXPRT *xprt)
443 {
444
445 SVC_EXT(xprt)->xp_flags &= ~SVC_VERSQUIET;
446 }
447
448 void
449 svc_versquiet(SVCXPRT *xprt)
450 {
451 __svc_versquiet_on(xprt);
452 }
453
454 int
455 __svc_versquiet_get(SVCXPRT *xprt)
456 {
457
458 return (SVC_EXT(xprt)->xp_flags & SVC_VERSQUIET);
459 }
460 #endif
461
462 /*
463 * Authentication error reply
464 */
465 void
svcerr_auth(SVCXPRT * xprt,enum auth_stat why)466 svcerr_auth(SVCXPRT *xprt, enum auth_stat why)
467 {
468 struct rpc_msg rply;
469
470 assert(xprt != NULL);
471
472 rply.rm_direction = REPLY;
473 rply.rm_reply.rp_stat = MSG_DENIED;
474 rply.rjcted_rply.rj_stat = AUTH_ERROR;
475 rply.rjcted_rply.rj_why = why;
476 SVC_REPLY(xprt, &rply);
477 }
478
479 /*
480 * Auth too weak error reply
481 */
482 void
svcerr_weakauth(SVCXPRT * xprt)483 svcerr_weakauth(SVCXPRT *xprt)
484 {
485
486 assert(xprt != NULL);
487
488 svcerr_auth(xprt, AUTH_TOOWEAK);
489 }
490
491 /*
492 * Program unavailable error reply
493 */
494 void
svcerr_noprog(SVCXPRT * xprt)495 svcerr_noprog(SVCXPRT *xprt)
496 {
497 struct rpc_msg rply;
498
499 assert(xprt != NULL);
500
501 rply.rm_direction = REPLY;
502 rply.rm_reply.rp_stat = MSG_ACCEPTED;
503 rply.acpted_rply.ar_verf = xprt->xp_verf;
504 rply.acpted_rply.ar_stat = PROG_UNAVAIL;
505 SVC_REPLY(xprt, &rply);
506 }
507
508 /*
509 * Program version mismatch error reply
510 */
511 void
svcerr_progvers(SVCXPRT * xprt,rpcvers_t low_vers,rpcvers_t high_vers)512 svcerr_progvers(SVCXPRT *xprt, rpcvers_t low_vers, rpcvers_t high_vers)
513 {
514 struct rpc_msg rply;
515
516 assert(xprt != NULL);
517
518 rply.rm_direction = REPLY;
519 rply.rm_reply.rp_stat = MSG_ACCEPTED;
520 rply.acpted_rply.ar_verf = xprt->xp_verf;
521 rply.acpted_rply.ar_stat = PROG_MISMATCH;
522 rply.acpted_rply.ar_vers.low = (u_int32_t)low_vers;
523 rply.acpted_rply.ar_vers.high = (u_int32_t)high_vers;
524 SVC_REPLY(xprt, &rply);
525 }
526
527 /*
528 * Allocate a new server transport structure. All fields are
529 * initialized to zero and xp_p3 is initialized to point at an
530 * extension structure to hold various flags and authentication
531 * parameters.
532 */
533 SVCXPRT *
svc_xprt_alloc(void)534 svc_xprt_alloc(void)
535 {
536 SVCXPRT *xprt;
537 SVCXPRT_EXT *ext;
538
539 xprt = mem_alloc(sizeof(SVCXPRT));
540 if (xprt == NULL)
541 return (NULL);
542 memset(xprt, 0, sizeof(SVCXPRT));
543 ext = mem_alloc(sizeof(SVCXPRT_EXT));
544 if (ext == NULL) {
545 mem_free(xprt, sizeof(SVCXPRT));
546 return (NULL);
547 }
548 memset(ext, 0, sizeof(SVCXPRT_EXT));
549 xprt->xp_p3 = ext;
550 ext->xp_auth.svc_ah_ops = &svc_auth_null_ops;
551
552 return (xprt);
553 }
554
555 /*
556 * Free a server transport structure.
557 */
558 void
svc_xprt_free(SVCXPRT * xprt)559 svc_xprt_free(SVCXPRT *xprt)
560 {
561
562 mem_free(xprt->xp_p3, sizeof(SVCXPRT_EXT));
563 mem_free(xprt, sizeof(SVCXPRT));
564 }
565
566 /* ******************* SERVER INPUT STUFF ******************* */
567
568 /*
569 * Get server side input from some transport.
570 *
571 * Statement of authentication parameters management:
572 * This function owns and manages all authentication parameters, specifically
573 * the "raw" parameters (msg.rm_call.cb_cred and msg.rm_call.cb_verf) and
574 * the "cooked" credentials (rqst->rq_clntcred).
575 * However, this function does not know the structure of the cooked
576 * credentials, so it make the following assumptions:
577 * a) the structure is contiguous (no pointers), and
578 * b) the cred structure size does not exceed RQCRED_SIZE bytes.
579 * In all events, all three parameters are freed upon exit from this routine.
580 * The storage is trivially management on the call stack in user land, but
581 * is mallocated in kernel land.
582 */
583
584 void
svc_getreq(int rdfds)585 svc_getreq(int rdfds)
586 {
587 fd_set readfds;
588
589 FD_ZERO(&readfds);
590 readfds.fds_bits[0] = rdfds;
591 svc_getreqset(&readfds);
592 }
593
594 void
svc_getreqset(fd_set * readfds)595 svc_getreqset(fd_set *readfds)
596 {
597 int bit, fd;
598 fd_mask mask, *maskp;
599 int sock;
600
601 assert(readfds != NULL);
602
603 maskp = readfds->fds_bits;
604 for (sock = 0; sock < FD_SETSIZE; sock += NFDBITS) {
605 for (mask = *maskp++; (bit = ffsl(mask)) != 0;
606 mask ^= (1ul << (bit - 1))) {
607 /* sock has input waiting */
608 fd = sock + bit - 1;
609 svc_getreq_common(fd);
610 }
611 }
612 }
613
614 void
svc_getreq_common(int fd)615 svc_getreq_common(int fd)
616 {
617 SVCXPRT *xprt;
618 struct svc_req r;
619 struct rpc_msg msg;
620 int prog_found;
621 rpcvers_t low_vers;
622 rpcvers_t high_vers;
623 enum xprt_stat stat;
624 char cred_area[2*MAX_AUTH_BYTES + RQCRED_SIZE];
625
626 msg.rm_call.cb_cred.oa_base = cred_area;
627 msg.rm_call.cb_verf.oa_base = &(cred_area[MAX_AUTH_BYTES]);
628 r.rq_clntcred = &(cred_area[2*MAX_AUTH_BYTES]);
629
630 rwlock_rdlock(&svc_fd_lock);
631 xprt = __svc_xports[fd];
632 rwlock_unlock(&svc_fd_lock);
633 if (xprt == NULL)
634 /* But do we control sock? */
635 return;
636 /* now receive msgs from xprtprt (support batch calls) */
637 do {
638 if (SVC_RECV(xprt, &msg)) {
639
640 /* now find the exported program and call it */
641 struct svc_callout *s;
642 enum auth_stat why;
643
644 r.rq_xprt = xprt;
645 r.rq_prog = msg.rm_call.cb_prog;
646 r.rq_vers = msg.rm_call.cb_vers;
647 r.rq_proc = msg.rm_call.cb_proc;
648 r.rq_cred = msg.rm_call.cb_cred;
649 /* first authenticate the message */
650 if ((why = _authenticate(&r, &msg)) != AUTH_OK) {
651 /*
652 * RPCSEC_GSS uses this return code
653 * for requests that form part of its
654 * context establishment protocol and
655 * should not be dispatched to the
656 * application.
657 */
658 if (why != RPCSEC_GSS_NODISPATCH)
659 svcerr_auth(xprt, why);
660 goto call_done;
661 }
662 /* now match message with a registered service*/
663 prog_found = FALSE;
664 low_vers = (rpcvers_t) -1L;
665 high_vers = (rpcvers_t) 0L;
666 for (s = svc_head; s != NULL; s = s->sc_next) {
667 if (s->sc_prog == r.rq_prog) {
668 if (s->sc_vers == r.rq_vers) {
669 (*s->sc_dispatch)(&r, xprt);
670 goto call_done;
671 } /* found correct version */
672 prog_found = TRUE;
673 if (s->sc_vers < low_vers)
674 low_vers = s->sc_vers;
675 if (s->sc_vers > high_vers)
676 high_vers = s->sc_vers;
677 } /* found correct program */
678 }
679 /*
680 * if we got here, the program or version
681 * is not served ...
682 */
683 if (prog_found)
684 svcerr_progvers(xprt, low_vers, high_vers);
685 else
686 svcerr_noprog(xprt);
687 /* Fall through to ... */
688 }
689 /*
690 * Check if the xprt has been disconnected in a
691 * recursive call in the service dispatch routine.
692 * If so, then break.
693 */
694 rwlock_rdlock(&svc_fd_lock);
695 if (xprt != __svc_xports[fd]) {
696 rwlock_unlock(&svc_fd_lock);
697 break;
698 }
699 rwlock_unlock(&svc_fd_lock);
700 call_done:
701 if ((stat = SVC_STAT(xprt)) == XPRT_DIED){
702 SVC_DESTROY(xprt);
703 break;
704 }
705 } while (stat == XPRT_MOREREQS);
706 }
707
708
709 void
svc_getreq_poll(struct pollfd * pfdp,int pollretval)710 svc_getreq_poll(struct pollfd *pfdp, int pollretval)
711 {
712 int i;
713 int fds_found;
714
715 for (i = fds_found = 0; fds_found < pollretval; i++) {
716 struct pollfd *p = &pfdp[i];
717
718 if (p->revents) {
719 /* fd has input waiting */
720 fds_found++;
721 /*
722 * We assume that this function is only called
723 * via someone _select()ing from svc_fdset or
724 * _poll()ing from svc_pollset[]. Thus it's safe
725 * to handle the POLLNVAL event by simply turning
726 * the corresponding bit off in svc_fdset. The
727 * svc_pollset[] array is derived from svc_fdset
728 * and so will also be updated eventually.
729 *
730 * XXX Should we do an xprt_unregister() instead?
731 */
732 if (p->revents & POLLNVAL) {
733 rwlock_wrlock(&svc_fd_lock);
734 FD_CLR(p->fd, &svc_fdset);
735 rwlock_unlock(&svc_fd_lock);
736 } else
737 svc_getreq_common(p->fd);
738 }
739 }
740 }
741
742 bool_t
rpc_control(int what,void * arg)743 rpc_control(int what, void *arg)
744 {
745 int val;
746
747 switch (what) {
748 case RPC_SVC_CONNMAXREC_SET:
749 val = *(int *)arg;
750 if (val <= 0)
751 return FALSE;
752 __svc_maxrec = val;
753 return TRUE;
754 case RPC_SVC_CONNMAXREC_GET:
755 *(int *)arg = __svc_maxrec;
756 return TRUE;
757 default:
758 break;
759 }
760 return FALSE;
761 }
762