FreeBSD/Linux Kernel Cross Reference
sys/rpc/rpcb_clnt.c
1 /* $NetBSD: rpcb_clnt.c,v 1.6 2000/07/16 06:41:43 itojun Exp $ */
2
3 /*
4 * The contents of this file are subject to the Sun Standards
5 * License Version 1.0 the (the "License";) You may not use
6 * this file except in compliance with the License. You may
7 * obtain a copy of the License at lib/libc/rpc/LICENSE
8 *
9 * Software distributed under the License is distributed on
10 * an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either
11 * express or implied. See the License for the specific
12 * language governing rights and limitations under the License.
13 *
14 * The Original Code is Copyright 1998 by Sun Microsystems, Inc
15 *
16 * The Initial Developer of the Original Code is: Sun
17 * Microsystems, Inc.
18 *
19 * All Rights Reserved.
20 *
21 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
22 * unrestricted use provided that this legend is included on all tape
23 * media and as a part of the software program in whole or part. Users
24 * may copy or modify Sun RPC without charge, but are not authorized
25 * to license or distribute it to anyone else except as part of a product or
26 * program developed by the user.
27 *
28 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
29 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
30 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
31 *
32 * Sun RPC is provided with no support and without any obligation on the
33 * part of Sun Microsystems, Inc. to assist in its use, correction,
34 * modification or enhancement.
35 *
36 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
37 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
38 * OR ANY PART THEREOF.
39 *
40 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
41 * or profits or other special, indirect and consequential damages, even if
42 * Sun has been advised of the possibility of such damages.
43 *
44 * Sun Microsystems, Inc.
45 * 2550 Garcia Avenue
46 * Mountain View, California 94043
47 */
48 /*
49 * Copyright (c) 1986-1991 by Sun Microsystems Inc.
50 */
51
52 /* #ident "@(#)rpcb_clnt.c 1.27 94/04/24 SMI" */
53
54
55 #if defined(LIBC_SCCS) && !defined(lint)
56 static char sccsid[] = "@(#)rpcb_clnt.c 1.30 89/06/21 Copyr 1988 Sun Micro";
57 #endif
58 #include <sys/cdefs.h>
59 __FBSDID("$FreeBSD: src/sys/rpc/rpcb_clnt.c,v 1.3 2008/06/29 01:04:48 julian Exp $");
60
61 /*
62 * rpcb_clnt.c
63 * interface to rpcbind rpc service.
64 *
65 * Copyright (C) 1988, Sun Microsystems, Inc.
66 */
67
68 #include "opt_inet6.h"
69
70 #include <sys/param.h>
71 #include <sys/systm.h>
72 #include <sys/kernel.h>
73 #include <sys/malloc.h>
74 #include <sys/proc.h>
75 #include <sys/socket.h>
76 #include <sys/socketvar.h>
77
78 #include <rpc/rpc.h>
79 #include <rpc/rpcb_clnt.h>
80 #include <rpc/rpcb_prot.h>
81
82 #include <rpc/rpc_com.h>
83
84 static struct timeval tottimeout = { 60, 0 };
85 static const struct timeval rmttimeout = { 3, 0 };
86 static const char nullstring[] = "\000";
87
88 static CLIENT *local_rpcb(void);
89
90 #if 0
91
92 static struct timeval rpcbrmttime = { 15, 0 };
93
94 #define CACHESIZE 6
95
96 struct address_cache {
97 char *ac_host;
98 char *ac_netid;
99 char *ac_uaddr;
100 struct netbuf *ac_taddr;
101 struct address_cache *ac_next;
102 };
103
104 static struct address_cache *front;
105 static int cachesize;
106
107 #define CLCR_GET_RPCB_TIMEOUT 1
108 #define CLCR_SET_RPCB_TIMEOUT 2
109
110
111 extern int __rpc_lowvers;
112
113 static struct address_cache *check_cache(const char *, const char *);
114 static void delete_cache(struct netbuf *);
115 static void add_cache(const char *, const char *, struct netbuf *, char *);
116 static CLIENT *getclnthandle(const char *, const struct netconfig *, char **);
117 static CLIENT *local_rpcb(void);
118 static struct netbuf *got_entry(rpcb_entry_list_ptr, const struct netconfig *);
119
120 /*
121 * This routine adjusts the timeout used for calls to the remote rpcbind.
122 * Also, this routine can be used to set the use of portmapper version 2
123 * only when doing rpc_broadcasts
124 * These are private routines that may not be provided in future releases.
125 */
126 bool_t
127 __rpc_control(request, info)
128 int request;
129 void *info;
130 {
131 switch (request) {
132 case CLCR_GET_RPCB_TIMEOUT:
133 *(struct timeval *)info = tottimeout;
134 break;
135 case CLCR_SET_RPCB_TIMEOUT:
136 tottimeout = *(struct timeval *)info;
137 break;
138 case CLCR_SET_LOWVERS:
139 __rpc_lowvers = *(int *)info;
140 break;
141 case CLCR_GET_LOWVERS:
142 *(int *)info = __rpc_lowvers;
143 break;
144 default:
145 return (FALSE);
146 }
147 return (TRUE);
148 }
149
150 /*
151 * It might seem that a reader/writer lock would be more reasonable here.
152 * However because getclnthandle(), the only user of the cache functions,
153 * may do a delete_cache() operation if a check_cache() fails to return an
154 * address useful to clnt_tli_create(), we may as well use a mutex.
155 */
156 /*
157 * As it turns out, if the cache lock is *not* a reader/writer lock, we will
158 * block all clnt_create's if we are trying to connect to a host that's down,
159 * since the lock will be held all during that time.
160 */
161
162 /*
163 * The routines check_cache(), add_cache(), delete_cache() manage the
164 * cache of rpcbind addresses for (host, netid).
165 */
166
167 static struct address_cache *
168 check_cache(host, netid)
169 const char *host, *netid;
170 {
171 struct address_cache *cptr;
172
173 /* READ LOCK HELD ON ENTRY: rpcbaddr_cache_lock */
174
175 for (cptr = front; cptr != NULL; cptr = cptr->ac_next) {
176 if (!strcmp(cptr->ac_host, host) &&
177 !strcmp(cptr->ac_netid, netid)) {
178 #ifdef ND_DEBUG
179 fprintf(stderr, "Found cache entry for %s: %s\n",
180 host, netid);
181 #endif
182 return (cptr);
183 }
184 }
185 return ((struct address_cache *) NULL);
186 }
187
188 static void
189 delete_cache(addr)
190 struct netbuf *addr;
191 {
192 struct address_cache *cptr, *prevptr = NULL;
193
194 /* WRITE LOCK HELD ON ENTRY: rpcbaddr_cache_lock */
195 for (cptr = front; cptr != NULL; cptr = cptr->ac_next) {
196 if (!memcmp(cptr->ac_taddr->buf, addr->buf, addr->len)) {
197 free(cptr->ac_host);
198 free(cptr->ac_netid);
199 free(cptr->ac_taddr->buf);
200 free(cptr->ac_taddr);
201 if (cptr->ac_uaddr)
202 free(cptr->ac_uaddr);
203 if (prevptr)
204 prevptr->ac_next = cptr->ac_next;
205 else
206 front = cptr->ac_next;
207 free(cptr);
208 cachesize--;
209 break;
210 }
211 prevptr = cptr;
212 }
213 }
214
215 static void
216 add_cache(host, netid, taddr, uaddr)
217 const char *host, *netid;
218 char *uaddr;
219 struct netbuf *taddr;
220 {
221 struct address_cache *ad_cache, *cptr, *prevptr;
222
223 ad_cache = (struct address_cache *)
224 malloc(sizeof (struct address_cache));
225 if (!ad_cache) {
226 return;
227 }
228 ad_cache->ac_host = strdup(host);
229 ad_cache->ac_netid = strdup(netid);
230 ad_cache->ac_uaddr = uaddr ? strdup(uaddr) : NULL;
231 ad_cache->ac_taddr = (struct netbuf *)malloc(sizeof (struct netbuf));
232 if (!ad_cache->ac_host || !ad_cache->ac_netid || !ad_cache->ac_taddr ||
233 (uaddr && !ad_cache->ac_uaddr)) {
234 goto out;
235 }
236 ad_cache->ac_taddr->len = ad_cache->ac_taddr->maxlen = taddr->len;
237 ad_cache->ac_taddr->buf = (char *) malloc(taddr->len);
238 if (ad_cache->ac_taddr->buf == NULL) {
239 out:
240 if (ad_cache->ac_host)
241 free(ad_cache->ac_host);
242 if (ad_cache->ac_netid)
243 free(ad_cache->ac_netid);
244 if (ad_cache->ac_uaddr)
245 free(ad_cache->ac_uaddr);
246 if (ad_cache->ac_taddr)
247 free(ad_cache->ac_taddr);
248 free(ad_cache);
249 return;
250 }
251 memcpy(ad_cache->ac_taddr->buf, taddr->buf, taddr->len);
252 #ifdef ND_DEBUG
253 fprintf(stderr, "Added to cache: %s : %s\n", host, netid);
254 #endif
255
256 /* VARIABLES PROTECTED BY rpcbaddr_cache_lock: cptr */
257
258 rwlock_wrlock(&rpcbaddr_cache_lock);
259 if (cachesize < CACHESIZE) {
260 ad_cache->ac_next = front;
261 front = ad_cache;
262 cachesize++;
263 } else {
264 /* Free the last entry */
265 cptr = front;
266 prevptr = NULL;
267 while (cptr->ac_next) {
268 prevptr = cptr;
269 cptr = cptr->ac_next;
270 }
271
272 #ifdef ND_DEBUG
273 fprintf(stderr, "Deleted from cache: %s : %s\n",
274 cptr->ac_host, cptr->ac_netid);
275 #endif
276 free(cptr->ac_host);
277 free(cptr->ac_netid);
278 free(cptr->ac_taddr->buf);
279 free(cptr->ac_taddr);
280 if (cptr->ac_uaddr)
281 free(cptr->ac_uaddr);
282
283 if (prevptr) {
284 prevptr->ac_next = NULL;
285 ad_cache->ac_next = front;
286 front = ad_cache;
287 } else {
288 front = ad_cache;
289 ad_cache->ac_next = NULL;
290 }
291 free(cptr);
292 }
293 rwlock_unlock(&rpcbaddr_cache_lock);
294 }
295
296 /*
297 * This routine will return a client handle that is connected to the
298 * rpcbind. If targaddr is non-NULL, the "universal address" of the
299 * host will be stored in *targaddr; the caller is responsible for
300 * freeing this string.
301 * On error, returns NULL and free's everything.
302 */
303 static CLIENT *
304 getclnthandle(host, nconf, targaddr)
305 const char *host;
306 const struct netconfig *nconf;
307 char **targaddr;
308 {
309 CLIENT *client;
310 struct netbuf *addr, taddr;
311 struct netbuf addr_to_delete;
312 struct __rpc_sockinfo si;
313 struct addrinfo hints, *res, *tres;
314 struct address_cache *ad_cache;
315 char *tmpaddr;
316
317 /* VARIABLES PROTECTED BY rpcbaddr_cache_lock: ad_cache */
318
319 /* Get the address of the rpcbind. Check cache first */
320 client = NULL;
321 addr_to_delete.len = 0;
322 rwlock_rdlock(&rpcbaddr_cache_lock);
323 ad_cache = NULL;
324 if (host != NULL)
325 ad_cache = check_cache(host, nconf->nc_netid);
326 if (ad_cache != NULL) {
327 addr = ad_cache->ac_taddr;
328 client = clnt_tli_create(RPC_ANYFD, nconf, addr,
329 (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0);
330 if (client != NULL) {
331 if (targaddr)
332 *targaddr = strdup(ad_cache->ac_uaddr);
333 rwlock_unlock(&rpcbaddr_cache_lock);
334 return (client);
335 }
336 addr_to_delete.len = addr->len;
337 addr_to_delete.buf = (char *)malloc(addr->len);
338 if (addr_to_delete.buf == NULL) {
339 addr_to_delete.len = 0;
340 } else {
341 memcpy(addr_to_delete.buf, addr->buf, addr->len);
342 }
343 }
344 rwlock_unlock(&rpcbaddr_cache_lock);
345 if (addr_to_delete.len != 0) {
346 /*
347 * Assume this may be due to cache data being
348 * outdated
349 */
350 rwlock_wrlock(&rpcbaddr_cache_lock);
351 delete_cache(&addr_to_delete);
352 rwlock_unlock(&rpcbaddr_cache_lock);
353 free(addr_to_delete.buf);
354 }
355 if (!__rpc_nconf2sockinfo(nconf, &si)) {
356 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
357 return NULL;
358 }
359
360 memset(&hints, 0, sizeof hints);
361 hints.ai_family = si.si_af;
362 hints.ai_socktype = si.si_socktype;
363 hints.ai_protocol = si.si_proto;
364
365 #ifdef CLNT_DEBUG
366 printf("trying netid %s family %d proto %d socktype %d\n",
367 nconf->nc_netid, si.si_af, si.si_proto, si.si_socktype);
368 #endif
369
370 if (nconf->nc_protofmly != NULL && strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) {
371 client = local_rpcb();
372 if (! client) {
373 #ifdef ND_DEBUG
374 clnt_pcreateerror("rpcbind clnt interface");
375 #endif
376 return (NULL);
377 } else {
378 struct sockaddr_un sun;
379 if (targaddr) {
380 *targaddr = malloc(sizeof(sun.sun_path));
381 if (*targaddr == NULL) {
382 CLNT_DESTROY(client);
383 return (NULL);
384 }
385 strncpy(*targaddr, _PATH_RPCBINDSOCK,
386 sizeof(sun.sun_path));
387 }
388 return (client);
389 }
390 } else {
391 if (getaddrinfo(host, "sunrpc", &hints, &res) != 0) {
392 rpc_createerr.cf_stat = RPC_UNKNOWNHOST;
393 return NULL;
394 }
395 }
396
397 for (tres = res; tres != NULL; tres = tres->ai_next) {
398 taddr.buf = tres->ai_addr;
399 taddr.len = taddr.maxlen = tres->ai_addrlen;
400
401 #ifdef ND_DEBUG
402 {
403 char *ua;
404
405 ua = taddr2uaddr(nconf, &taddr);
406 fprintf(stderr, "Got it [%s]\n", ua);
407 free(ua);
408 }
409 #endif
410
411 #ifdef ND_DEBUG
412 {
413 int i;
414
415 fprintf(stderr, "\tnetbuf len = %d, maxlen = %d\n",
416 taddr.len, taddr.maxlen);
417 fprintf(stderr, "\tAddress is ");
418 for (i = 0; i < taddr.len; i++)
419 fprintf(stderr, "%u.", ((char *)(taddr.buf))[i]);
420 fprintf(stderr, "\n");
421 }
422 #endif
423 client = clnt_tli_create(RPC_ANYFD, nconf, &taddr,
424 (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0);
425 #ifdef ND_DEBUG
426 if (! client) {
427 clnt_pcreateerror("rpcbind clnt interface");
428 }
429 #endif
430
431 if (client) {
432 tmpaddr = targaddr ? taddr2uaddr(nconf, &taddr) : NULL;
433 add_cache(host, nconf->nc_netid, &taddr, tmpaddr);
434 if (targaddr)
435 *targaddr = tmpaddr;
436 break;
437 }
438 }
439 if (res)
440 freeaddrinfo(res);
441 return (client);
442 }
443
444 #endif
445
446 /* XXX */
447 #define IN4_LOCALHOST_STRING "127.0.0.1"
448 #define IN6_LOCALHOST_STRING "::1"
449
450 /*
451 * This routine will return a client handle that is connected to the local
452 * rpcbind. Returns NULL on error and free's everything.
453 */
454 static CLIENT *
455 local_rpcb()
456 {
457 CLIENT *client;
458 struct socket *so;
459 size_t tsize;
460 struct sockaddr_un sun;
461 int error;
462
463 /*
464 * Try connecting to the local rpcbind through a local socket
465 * first. If this doesn't work, try all transports defined in
466 * the netconfig file.
467 */
468 memset(&sun, 0, sizeof sun);
469 so = NULL;
470 error = socreate(AF_LOCAL, &so, SOCK_STREAM, 0, curthread->td_ucred,
471 curthread);
472 if (error)
473 goto try_nconf;
474 sun.sun_family = AF_LOCAL;
475 strcpy(sun.sun_path, _PATH_RPCBINDSOCK);
476 sun.sun_len = SUN_LEN(&sun);
477
478 tsize = __rpc_get_t_size(AF_LOCAL, 0, 0);
479 client = clnt_vc_create(so, (struct sockaddr *)&sun, (rpcprog_t)RPCBPROG,
480 (rpcvers_t)RPCBVERS, tsize, tsize);
481
482 if (client != NULL) {
483 /* Mark the socket to be closed in destructor */
484 (void) CLNT_CONTROL(client, CLSET_FD_CLOSE, NULL);
485 return client;
486 }
487
488 /* Nobody needs this socket anymore; free the descriptor. */
489 soclose(so);
490
491 try_nconf:
492
493 #if 0
494 static struct netconfig *loopnconf;
495 static char *localhostname;
496
497 /* VARIABLES PROTECTED BY loopnconf_lock: loopnconf */
498 mutex_lock(&loopnconf_lock);
499 if (loopnconf == NULL) {
500 struct netconfig *nconf, *tmpnconf = NULL;
501 void *nc_handle;
502 int fd;
503
504 nc_handle = setnetconfig();
505 if (nc_handle == NULL) {
506 /* fails to open netconfig file */
507 syslog (LOG_ERR, "rpc: failed to open " NETCONFIG);
508 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
509 mutex_unlock(&loopnconf_lock);
510 return (NULL);
511 }
512 while ((nconf = getnetconfig(nc_handle)) != NULL) {
513 if ((
514 #ifdef INET6
515 strcmp(nconf->nc_protofmly, NC_INET6) == 0 ||
516 #endif
517 strcmp(nconf->nc_protofmly, NC_INET) == 0) &&
518 (nconf->nc_semantics == NC_TPI_COTS ||
519 nconf->nc_semantics == NC_TPI_COTS_ORD)) {
520 fd = __rpc_nconf2fd(nconf);
521 /*
522 * Can't create a socket, assume that
523 * this family isn't configured in the kernel.
524 */
525 if (fd < 0)
526 continue;
527 _close(fd);
528 tmpnconf = nconf;
529 if (!strcmp(nconf->nc_protofmly, NC_INET))
530 localhostname = IN4_LOCALHOST_STRING;
531 else
532 localhostname = IN6_LOCALHOST_STRING;
533 }
534 }
535 if (tmpnconf == NULL) {
536 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
537 mutex_unlock(&loopnconf_lock);
538 return (NULL);
539 }
540 loopnconf = getnetconfigent(tmpnconf->nc_netid);
541 /* loopnconf is never freed */
542 endnetconfig(nc_handle);
543 }
544 mutex_unlock(&loopnconf_lock);
545 client = getclnthandle(localhostname, loopnconf, NULL);
546 return (client);
547 #else
548 return (NULL);
549 #endif
550 }
551
552 /*
553 * Set a mapping between program, version and address.
554 * Calls the rpcbind service to do the mapping.
555 */
556 bool_t
557 rpcb_set(rpcprog_t program, rpcvers_t version,
558 const struct netconfig *nconf, /* Network structure of transport */
559 const struct netbuf *address) /* Services netconfig address */
560 {
561 CLIENT *client;
562 bool_t rslt = FALSE;
563 RPCB parms;
564 #if 0
565 char uidbuf[32];
566 #endif
567 struct netconfig nconfcopy;
568 struct netbuf addresscopy;
569
570 /* parameter checking */
571 if (nconf == NULL) {
572 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
573 return (FALSE);
574 }
575 if (address == NULL) {
576 rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
577 return (FALSE);
578 }
579 client = local_rpcb();
580 if (! client) {
581 return (FALSE);
582 }
583
584 /* convert to universal */
585 /*LINTED const castaway*/
586 nconfcopy = *nconf;
587 addresscopy = *address;
588 parms.r_addr = taddr2uaddr(&nconfcopy, &addresscopy);
589 if (!parms.r_addr) {
590 CLNT_DESTROY(client);
591 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE;
592 return (FALSE); /* no universal address */
593 }
594 parms.r_prog = program;
595 parms.r_vers = version;
596 parms.r_netid = nconf->nc_netid;
597 #if 0
598 /*
599 * Though uid is not being used directly, we still send it for
600 * completeness. For non-unix platforms, perhaps some other
601 * string or an empty string can be sent.
602 */
603 (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid());
604 parms.r_owner = uidbuf;
605 #else
606 parms.r_owner = "";
607 #endif
608
609 CLNT_CALL(client, (rpcproc_t)RPCBPROC_SET, (xdrproc_t) xdr_rpcb,
610 (char *)(void *)&parms, (xdrproc_t) xdr_bool,
611 (char *)(void *)&rslt, tottimeout);
612
613 CLNT_DESTROY(client);
614 free(parms.r_addr, M_RPC);
615 return (rslt);
616 }
617
618 /*
619 * Remove the mapping between program, version and netbuf address.
620 * Calls the rpcbind service to do the un-mapping.
621 * If netbuf is NULL, unset for all the transports, otherwise unset
622 * only for the given transport.
623 */
624 bool_t
625 rpcb_unset(rpcprog_t program, rpcvers_t version, const struct netconfig *nconf)
626 {
627 CLIENT *client;
628 bool_t rslt = FALSE;
629 RPCB parms;
630 #if 0
631 char uidbuf[32];
632 #endif
633
634 client = local_rpcb();
635 if (! client) {
636 return (FALSE);
637 }
638
639 parms.r_prog = program;
640 parms.r_vers = version;
641 if (nconf)
642 parms.r_netid = nconf->nc_netid;
643 else {
644 /*LINTED const castaway*/
645 parms.r_netid = (char *)(uintptr_t) &nullstring[0]; /* unsets all */
646 }
647 /*LINTED const castaway*/
648 parms.r_addr = (char *)(uintptr_t) &nullstring[0];
649 #if 0
650 (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid());
651 parms.r_owner = uidbuf;
652 #else
653 parms.r_owner = "";
654 #endif
655
656 CLNT_CALL(client, (rpcproc_t)RPCBPROC_UNSET, (xdrproc_t) xdr_rpcb,
657 (char *)(void *)&parms, (xdrproc_t) xdr_bool,
658 (char *)(void *)&rslt, tottimeout);
659
660 CLNT_DESTROY(client);
661 return (rslt);
662 }
663
664 #if 0
665
666 /*
667 * From the merged list, find the appropriate entry
668 */
669 static struct netbuf *
670 got_entry(relp, nconf)
671 rpcb_entry_list_ptr relp;
672 const struct netconfig *nconf;
673 {
674 struct netbuf *na = NULL;
675 rpcb_entry_list_ptr sp;
676 rpcb_entry *rmap;
677
678 for (sp = relp; sp != NULL; sp = sp->rpcb_entry_next) {
679 rmap = &sp->rpcb_entry_map;
680 if ((strcmp(nconf->nc_proto, rmap->r_nc_proto) == 0) &&
681 (strcmp(nconf->nc_protofmly, rmap->r_nc_protofmly) == 0) &&
682 (nconf->nc_semantics == rmap->r_nc_semantics) &&
683 (rmap->r_maddr != NULL) && (rmap->r_maddr[0] != 0)) {
684 na = uaddr2taddr(nconf, rmap->r_maddr);
685 #ifdef ND_DEBUG
686 fprintf(stderr, "\tRemote address is [%s].\n",
687 rmap->r_maddr);
688 if (!na)
689 fprintf(stderr,
690 "\tCouldn't resolve remote address!\n");
691 #endif
692 break;
693 }
694 }
695 return (na);
696 }
697
698 /*
699 * Quick check to see if rpcbind is up. Tries to connect over
700 * local transport.
701 */
702 static bool_t
703 __rpcbind_is_up()
704 {
705 struct netconfig *nconf;
706 struct sockaddr_un sun;
707 void *localhandle;
708 int sock;
709
710 nconf = NULL;
711 localhandle = setnetconfig();
712 while ((nconf = getnetconfig(localhandle)) != NULL) {
713 if (nconf->nc_protofmly != NULL &&
714 strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0)
715 break;
716 }
717 if (nconf == NULL)
718 return (FALSE);
719
720 endnetconfig(localhandle);
721
722 memset(&sun, 0, sizeof sun);
723 sock = _socket(AF_LOCAL, SOCK_STREAM, 0);
724 if (sock < 0)
725 return (FALSE);
726 sun.sun_family = AF_LOCAL;
727 strncpy(sun.sun_path, _PATH_RPCBINDSOCK, sizeof(sun.sun_path));
728 sun.sun_len = SUN_LEN(&sun);
729
730 if (_connect(sock, (struct sockaddr *)&sun, sun.sun_len) < 0) {
731 _close(sock);
732 return (FALSE);
733 }
734
735 _close(sock);
736 return (TRUE);
737 }
738
739 /*
740 * An internal function which optimizes rpcb_getaddr function. It also
741 * returns the client handle that it uses to contact the remote rpcbind.
742 *
743 * The algorithm used: If the transports is TCP or UDP, it first tries
744 * version 2 (portmap), 4 and then 3 (svr4). This order should be
745 * changed in the next OS release to 4, 2 and 3. We are assuming that by
746 * that time, version 4 would be available on many machines on the network.
747 * With this algorithm, we get performance as well as a plan for
748 * obsoleting version 2.
749 *
750 * For all other transports, the algorithm remains as 4 and then 3.
751 *
752 * XXX: Due to some problems with t_connect(), we do not reuse the same client
753 * handle for COTS cases and hence in these cases we do not return the
754 * client handle. This code will change if t_connect() ever
755 * starts working properly. Also look under clnt_vc.c.
756 */
757 struct netbuf *
758 __rpcb_findaddr_timed(program, version, nconf, host, clpp, tp)
759 rpcprog_t program;
760 rpcvers_t version;
761 const struct netconfig *nconf;
762 const char *host;
763 CLIENT **clpp;
764 struct timeval *tp;
765 {
766 static bool_t check_rpcbind = TRUE;
767 CLIENT *client = NULL;
768 RPCB parms;
769 enum clnt_stat clnt_st;
770 char *ua = NULL;
771 rpcvers_t vers;
772 struct netbuf *address = NULL;
773 rpcvers_t start_vers = RPCBVERS4;
774 struct netbuf servaddr;
775
776 /* parameter checking */
777 if (nconf == NULL) {
778 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
779 return (NULL);
780 }
781
782 parms.r_addr = NULL;
783
784 /*
785 * Use default total timeout if no timeout is specified.
786 */
787 if (tp == NULL)
788 tp = &tottimeout;
789
790 #ifdef PORTMAP
791 /* Try version 2 for TCP or UDP */
792 if (strcmp(nconf->nc_protofmly, NC_INET) == 0) {
793 u_short port = 0;
794 struct netbuf remote;
795 rpcvers_t pmapvers = 2;
796 struct pmap pmapparms;
797
798 /*
799 * Try UDP only - there are some portmappers out
800 * there that use UDP only.
801 */
802 if (strcmp(nconf->nc_proto, NC_TCP) == 0) {
803 struct netconfig *newnconf;
804
805 if ((newnconf = getnetconfigent("udp")) == NULL) {
806 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
807 return (NULL);
808 }
809 client = getclnthandle(host, newnconf, &parms.r_addr);
810 freenetconfigent(newnconf);
811 } else {
812 client = getclnthandle(host, nconf, &parms.r_addr);
813 }
814 if (client == NULL)
815 return (NULL);
816
817 /*
818 * Set version and retry timeout.
819 */
820 CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *)&rpcbrmttime);
821 CLNT_CONTROL(client, CLSET_VERS, (char *)&pmapvers);
822
823 pmapparms.pm_prog = program;
824 pmapparms.pm_vers = version;
825 pmapparms.pm_prot = strcmp(nconf->nc_proto, NC_TCP) ?
826 IPPROTO_UDP : IPPROTO_TCP;
827 pmapparms.pm_port = 0; /* not needed */
828 clnt_st = CLNT_CALL(client, (rpcproc_t)PMAPPROC_GETPORT,
829 (xdrproc_t) xdr_pmap, (caddr_t)(void *)&pmapparms,
830 (xdrproc_t) xdr_u_short, (caddr_t)(void *)&port,
831 *tp);
832 if (clnt_st != RPC_SUCCESS) {
833 if ((clnt_st == RPC_PROGVERSMISMATCH) ||
834 (clnt_st == RPC_PROGUNAVAIL))
835 goto try_rpcbind; /* Try different versions */
836 rpc_createerr.cf_stat = RPC_PMAPFAILURE;
837 clnt_geterr(client, &rpc_createerr.cf_error);
838 goto error;
839 } else if (port == 0) {
840 address = NULL;
841 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
842 goto error;
843 }
844 port = htons(port);
845 CLNT_CONTROL(client, CLGET_SVC_ADDR, (char *)&remote);
846 if (((address = (struct netbuf *)
847 malloc(sizeof (struct netbuf))) == NULL) ||
848 ((address->buf = (char *)
849 malloc(remote.len)) == NULL)) {
850 rpc_createerr.cf_stat = RPC_SYSTEMERROR;
851 clnt_geterr(client, &rpc_createerr.cf_error);
852 if (address) {
853 free(address);
854 address = NULL;
855 }
856 goto error;
857 }
858 memcpy(address->buf, remote.buf, remote.len);
859 memcpy(&((char *)address->buf)[sizeof (short)],
860 (char *)(void *)&port, sizeof (short));
861 address->len = address->maxlen = remote.len;
862 goto done;
863 }
864 #endif /* PORTMAP */
865
866 try_rpcbind:
867 /*
868 * Check if rpcbind is up. This prevents needless delays when
869 * accessing applications such as the keyserver while booting
870 * disklessly.
871 */
872 if (check_rpcbind && strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) {
873 if (!__rpcbind_is_up()) {
874 rpc_createerr.cf_stat = RPC_PMAPFAILURE;
875 rpc_createerr.cf_error.re_errno = 0;
876 goto error;
877 }
878 check_rpcbind = FALSE;
879 }
880
881 /*
882 * Now we try version 4 and then 3.
883 * We also send the remote system the address we used to
884 * contact it in case it can help to connect back with us
885 */
886 parms.r_prog = program;
887 parms.r_vers = version;
888 /*LINTED const castaway*/
889 parms.r_owner = (char *) &nullstring[0]; /* not needed; */
890 /* just for xdring */
891 parms.r_netid = nconf->nc_netid; /* not really needed */
892
893 /*
894 * If a COTS transport is being used, try getting address via CLTS
895 * transport. This works only with version 4.
896 */
897 if (nconf->nc_semantics == NC_TPI_COTS_ORD ||
898 nconf->nc_semantics == NC_TPI_COTS) {
899
900 void *handle;
901 struct netconfig *nconf_clts;
902 rpcb_entry_list_ptr relp = NULL;
903
904 if (client == NULL) {
905 /* This did not go through the above PORTMAP/TCP code */
906 if ((handle = __rpc_setconf("datagram_v")) != NULL) {
907 while ((nconf_clts = __rpc_getconf(handle))
908 != NULL) {
909 if (strcmp(nconf_clts->nc_protofmly,
910 nconf->nc_protofmly) != 0) {
911 continue;
912 }
913 client = getclnthandle(host, nconf_clts,
914 &parms.r_addr);
915 break;
916 }
917 __rpc_endconf(handle);
918 }
919 if (client == NULL)
920 goto regular_rpcbind; /* Go the regular way */
921 } else {
922 /* This is a UDP PORTMAP handle. Change to version 4 */
923 vers = RPCBVERS4;
924 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers);
925 }
926 /*
927 * We also send the remote system the address we used to
928 * contact it in case it can help it connect back with us
929 */
930 if (parms.r_addr == NULL) {
931 /*LINTED const castaway*/
932 parms.r_addr = (char *) &nullstring[0]; /* for XDRing */
933 }
934
935 CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *)&rpcbrmttime);
936
937 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDRLIST,
938 (xdrproc_t) xdr_rpcb, (char *)(void *)&parms,
939 (xdrproc_t) xdr_rpcb_entry_list_ptr,
940 (char *)(void *)&relp, *tp);
941 if (clnt_st == RPC_SUCCESS) {
942 if ((address = got_entry(relp, nconf)) != NULL) {
943 xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr,
944 (char *)(void *)&relp);
945 CLNT_CONTROL(client, CLGET_SVC_ADDR,
946 (char *)(void *)&servaddr);
947 __rpc_fixup_addr(address, &servaddr);
948 goto done;
949 }
950 /* Entry not found for this transport */
951 xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr,
952 (char *)(void *)&relp);
953 /*
954 * XXX: should have perhaps returned with error but
955 * since the remote machine might not always be able
956 * to send the address on all transports, we try the
957 * regular way with regular_rpcbind
958 */
959 goto regular_rpcbind;
960 } else if ((clnt_st == RPC_PROGVERSMISMATCH) ||
961 (clnt_st == RPC_PROGUNAVAIL)) {
962 start_vers = RPCBVERS; /* Try version 3 now */
963 goto regular_rpcbind; /* Try different versions */
964 } else {
965 rpc_createerr.cf_stat = RPC_PMAPFAILURE;
966 clnt_geterr(client, &rpc_createerr.cf_error);
967 goto error;
968 }
969 }
970
971 regular_rpcbind:
972
973 /* Now the same transport is to be used to get the address */
974 if (client && ((nconf->nc_semantics == NC_TPI_COTS_ORD) ||
975 (nconf->nc_semantics == NC_TPI_COTS))) {
976 /* A CLTS type of client - destroy it */
977 CLNT_DESTROY(client);
978 client = NULL;
979 }
980
981 if (client == NULL) {
982 client = getclnthandle(host, nconf, &parms.r_addr);
983 if (client == NULL) {
984 goto error;
985 }
986 }
987 if (parms.r_addr == NULL) {
988 /*LINTED const castaway*/
989 parms.r_addr = (char *) &nullstring[0];
990 }
991
992 /* First try from start_vers and then version 3 (RPCBVERS) */
993
994 CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *) &rpcbrmttime);
995 for (vers = start_vers; vers >= RPCBVERS; vers--) {
996 /* Set the version */
997 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers);
998 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDR,
999 (xdrproc_t) xdr_rpcb, (char *)(void *)&parms,
1000 (xdrproc_t) xdr_wrapstring, (char *)(void *) &ua, *tp);
1001 if (clnt_st == RPC_SUCCESS) {
1002 if ((ua == NULL) || (ua[0] == 0)) {
1003 /* address unknown */
1004 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
1005 goto error;
1006 }
1007 address = uaddr2taddr(nconf, ua);
1008 #ifdef ND_DEBUG
1009 fprintf(stderr, "\tRemote address is [%s]\n", ua);
1010 if (!address)
1011 fprintf(stderr,
1012 "\tCouldn't resolve remote address!\n");
1013 #endif
1014 xdr_free((xdrproc_t)xdr_wrapstring,
1015 (char *)(void *)&ua);
1016
1017 if (! address) {
1018 /* We don't know about your universal address */
1019 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE;
1020 goto error;
1021 }
1022 CLNT_CONTROL(client, CLGET_SVC_ADDR,
1023 (char *)(void *)&servaddr);
1024 __rpc_fixup_addr(address, &servaddr);
1025 goto done;
1026 } else if (clnt_st == RPC_PROGVERSMISMATCH) {
1027 struct rpc_err rpcerr;
1028
1029 clnt_geterr(client, &rpcerr);
1030 if (rpcerr.re_vers.low > RPCBVERS4)
1031 goto error; /* a new version, can't handle */
1032 } else if (clnt_st != RPC_PROGUNAVAIL) {
1033 /* Cant handle this error */
1034 rpc_createerr.cf_stat = clnt_st;
1035 clnt_geterr(client, &rpc_createerr.cf_error);
1036 goto error;
1037 }
1038 }
1039
1040 error:
1041 if |