1/* $NetBSD: rpcb_clnt.c,v 1.1 2010/07/26 15:56:45 pooka Exp $ */ 2 3/* 4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 5 * unrestricted use provided that this legend is included on all tape 6 * media and as a part of the software program in whole or part. Users 7 * may copy or modify Sun RPC without charge, but are not authorized 8 * to license or distribute it to anyone else except as part of a product or 9 * program developed by the user. 10 * 11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 14 * 15 * Sun RPC is provided with no support and without any obligation on the 16 * part of Sun Microsystems, Inc. to assist in its use, correction, 17 * modification or enhancement. 18 * 19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 21 * OR ANY PART THEREOF. 22 * 23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 24 * or profits or other special, indirect and consequential damages, even if 25 * Sun has been advised of the possibility of such damages. 26 * 27 * Sun Microsystems, Inc. 28 * 2550 Garcia Avenue 29 * Mountain View, California 94043 30 */ 31/* 32 * Copyright (c) 1986-1991 by Sun Microsystems Inc. 33 */ 34 35/* #ident "@(#)rpcb_clnt.c 1.27 94/04/24 SMI" */ 36 37#include <sys/cdefs.h> 38#if defined(LIBC_SCCS) && !defined(lint) 39#if 0 40static char sccsid[] = "@(#)rpcb_clnt.c 1.30 89/06/21 Copyr 1988 Sun Micro"; 41#else 42__RCSID("$NetBSD: rpcb_clnt.c,v 1.1 2010/07/26 15:56:45 pooka Exp $"); 43#endif 44#endif 45 46/* 47 * rpcb_clnt.c 48 * interface to rpcbind rpc service. 49 * 50 * Copyright (C) 1988, Sun Microsystems, Inc. 51 */ 52 53#include "namespace.h" 54#include "reentrant.h" 55#include <sys/types.h> 56#include <sys/socket.h> 57#include <sys/un.h> 58#include <sys/utsname.h> 59#include <rpc/rpc.h> 60#include <rpc/rpcb_prot.h> 61#include <rpc/nettype.h> 62#include <netconfig.h> 63#ifdef PORTMAP 64#include <netinet/in.h> /* FOR IPPROTO_TCP/UDP definitions */ 65#include <rpc/pmap_prot.h> 66#endif 67#include <assert.h> 68#include <errno.h> 69#include <netdb.h> 70#include <stdio.h> 71#include <stdlib.h> 72#include <string.h> 73#include <syslog.h> 74#include <unistd.h> 75 76#include <rump/rump.h> 77#include <rump/rump_syscalls.h> 78 79#include "rpc_internal.h" 80 81#ifdef __weak_alias 82__weak_alias(rpcb_set,_rpcb_set) 83__weak_alias(rpcb_unset,_rpcb_unset) 84__weak_alias(rpcb_getmaps,_rpcb_getmaps) 85__weak_alias(rpcb_taddr2uaddr,_rpcb_taddr2uaddr) 86__weak_alias(rpcb_uaddr2taddr,_rpcb_uaddr2taddr) 87#endif 88 89static struct timeval tottimeout = { 60, 0 }; 90static const struct timeval rmttimeout = { 3, 0 }; 91 92static const char nullstring[] = "\000"; 93 94#define CACHESIZE 6 95 96struct 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 104static struct address_cache *front; 105static int cachesize; 106 107#define CLCR_GET_RPCB_TIMEOUT 1 108#define CLCR_SET_RPCB_TIMEOUT 2 109 110 111extern int __rpc_lowvers; 112 113static struct address_cache *check_cache __P((const char *, const char *)); 114static void delete_cache __P((struct netbuf *)); 115static void add_cache __P((const char *, const char *, struct netbuf *, 116 char *)); 117static CLIENT *getclnthandle __P((const char *, const struct netconfig *, 118 char **)); 119static CLIENT *local_rpcb __P((void)); 120static struct netbuf *got_entry __P((rpcb_entry_list_ptr, 121 const struct netconfig *)); 122 123/* 124 * This routine adjusts the timeout used for calls to the remote rpcbind. 125 * Also, this routine can be used to set the use of portmapper version 2 126 * only when doing rpc_broadcasts 127 * These are private routines that may not be provided in future releases. 128 */ 129bool_t 130__rpc_control(request, info) 131 int request; 132 void *info; 133{ 134 135 _DIAGASSERT(info != NULL); 136 137 switch (request) { 138 case CLCR_GET_RPCB_TIMEOUT: 139 *(struct timeval *)info = tottimeout; 140 break; 141 case CLCR_SET_RPCB_TIMEOUT: 142 tottimeout = *(struct timeval *)info; 143 break; 144 case CLCR_SET_LOWVERS: 145 __rpc_lowvers = *(int *)info; 146 break; 147 case CLCR_GET_LOWVERS: 148 *(int *)info = __rpc_lowvers; 149 break; 150 default: 151 return (FALSE); 152 } 153 return (TRUE); 154} 155 156/* 157 * It might seem that a reader/writer lock would be more reasonable here. 158 * However because getclnthandle(), the only user of the cache functions, 159 * may do a delete_cache() operation if a check_cache() fails to return an 160 * address useful to clnt_tli_create(), we may as well use a mutex. 161 */ 162/* 163 * As it turns out, if the cache lock is *not* a reader/writer lock, we will 164 * block all clnt_create's if we are trying to connect to a host that's down, 165 * since the lock will be held all during that time. 166 */ 167#ifdef _REENTRANT 168extern rwlock_t rpcbaddr_cache_lock; 169#endif 170 171/* 172 * The routines check_cache(), add_cache(), delete_cache() manage the 173 * cache of rpcbind addresses for (host, netid). 174 */ 175 176static struct address_cache * 177check_cache(host, netid) 178 const char *host, *netid; 179{ 180 struct address_cache *cptr; 181 182 _DIAGASSERT(host != NULL); 183 _DIAGASSERT(netid != NULL); 184 185 /* READ LOCK HELD ON ENTRY: rpcbaddr_cache_lock */ 186 187 for (cptr = front; cptr != NULL; cptr = cptr->ac_next) { 188 if (!strcmp(cptr->ac_host, host) && 189 !strcmp(cptr->ac_netid, netid)) { 190#ifdef ND_DEBUG 191 fprintf(stderr, "Found cache entry for %s: %s\n", 192 host, netid); 193#endif 194 return (cptr); 195 } 196 } 197 return NULL; 198} 199 200static void 201delete_cache(addr) 202 struct netbuf *addr; 203{ 204 struct address_cache *cptr, *prevptr = NULL; 205 206 _DIAGASSERT(addr != NULL); 207 208 /* WRITE LOCK HELD ON ENTRY: rpcbaddr_cache_lock */ 209 for (cptr = front; cptr != NULL; cptr = cptr->ac_next) { 210 if (!memcmp(cptr->ac_taddr->buf, addr->buf, addr->len)) { 211 free(cptr->ac_host); 212 free(cptr->ac_netid); 213 free(cptr->ac_taddr->buf); 214 free(cptr->ac_taddr); 215 if (cptr->ac_uaddr) 216 free(cptr->ac_uaddr); 217 if (prevptr) 218 prevptr->ac_next = cptr->ac_next; 219 else 220 front = cptr->ac_next; 221 free(cptr); 222 cachesize--; 223 break; 224 } 225 prevptr = cptr; 226 } 227} 228 229static void 230add_cache(host, netid, taddr, uaddr) 231 const char *host, *netid; 232 char *uaddr; 233 struct netbuf *taddr; 234{ 235 struct address_cache *ad_cache, *cptr, *prevptr; 236 237 _DIAGASSERT(host != NULL); 238 _DIAGASSERT(netid != NULL); 239 /* uaddr may be NULL */ 240 /* taddr may be NULL ??? */ 241 242 ad_cache = malloc(sizeof(*ad_cache)); 243 if (!ad_cache) { 244 return; 245 } 246 ad_cache->ac_host = strdup(host); 247 ad_cache->ac_netid = strdup(netid); 248 ad_cache->ac_uaddr = uaddr ? strdup(uaddr) : NULL; 249 ad_cache->ac_taddr = malloc(sizeof(*ad_cache->ac_taddr)); 250 if (!ad_cache->ac_host || !ad_cache->ac_netid || !ad_cache->ac_taddr || 251 (uaddr && !ad_cache->ac_uaddr)) { 252 goto out; 253 } 254 ad_cache->ac_taddr->len = ad_cache->ac_taddr->maxlen = taddr->len; 255 ad_cache->ac_taddr->buf = malloc(taddr->len); 256 if (ad_cache->ac_taddr->buf == NULL) { 257out: 258 if (ad_cache->ac_host) 259 free(ad_cache->ac_host); 260 if (ad_cache->ac_netid) 261 free(ad_cache->ac_netid); 262 if (ad_cache->ac_uaddr) 263 free(ad_cache->ac_uaddr); 264 if (ad_cache->ac_taddr) 265 free(ad_cache->ac_taddr); 266 free(ad_cache); 267 return; 268 } 269 memcpy(ad_cache->ac_taddr->buf, taddr->buf, taddr->len); 270#ifdef ND_DEBUG 271 fprintf(stderr, "Added to cache: %s : %s\n", host, netid); 272#endif 273 274/* VARIABLES PROTECTED BY rpcbaddr_cache_lock: cptr */ 275 276 rwlock_wrlock(&rpcbaddr_cache_lock); 277 if (cachesize < CACHESIZE) { 278 ad_cache->ac_next = front; 279 front = ad_cache; 280 cachesize++; 281 } else { 282 /* Free the last entry */ 283 cptr = front; 284 prevptr = NULL; 285 while (cptr->ac_next) { 286 prevptr = cptr; 287 cptr = cptr->ac_next; 288 } 289 290#ifdef ND_DEBUG 291 fprintf(stderr, "Deleted from cache: %s : %s\n", 292 cptr->ac_host, cptr->ac_netid); 293#endif 294 free(cptr->ac_host); 295 free(cptr->ac_netid); 296 free(cptr->ac_taddr->buf); 297 free(cptr->ac_taddr); 298 if (cptr->ac_uaddr) 299 free(cptr->ac_uaddr); 300 301 if (prevptr) { 302 prevptr->ac_next = NULL; 303 ad_cache->ac_next = front; 304 front = ad_cache; 305 } else { 306 front = ad_cache; 307 ad_cache->ac_next = NULL; 308 } 309 free(cptr); 310 } 311 rwlock_unlock(&rpcbaddr_cache_lock); 312} 313 314/* 315 * This routine will return a client handle that is connected to the 316 * rpcbind. Returns NULL on error and free's everything. 317 */ 318static CLIENT * 319getclnthandle(host, nconf, targaddr) 320 const char *host; 321 const struct netconfig *nconf; 322 char **targaddr; 323{ 324 CLIENT *client; 325 struct netbuf *addr, taddr; 326 struct netbuf addr_to_delete; 327 struct __rpc_sockinfo si; 328 struct addrinfo hints, *res, *tres; 329 struct address_cache *ad_cache; 330 char *tmpaddr; 331 332 _DIAGASSERT(host != NULL); 333 _DIAGASSERT(nconf != NULL); 334 /* targaddr may be NULL */ 335 336/* VARIABLES PROTECTED BY rpcbaddr_cache_lock: ad_cache */ 337 338 /* Get the address of the rpcbind. Check cache first */ 339 client = NULL; 340 addr_to_delete.len = 0; 341 addr_to_delete.buf = NULL; 342 rwlock_rdlock(&rpcbaddr_cache_lock); 343 ad_cache = check_cache(host, nconf->nc_netid); 344 if (ad_cache != NULL) { 345 addr = ad_cache->ac_taddr; 346 client = clnt_tli_create(RPC_ANYFD, nconf, addr, 347 (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0); 348 if (client != NULL) { 349 if (targaddr) 350 *targaddr = ad_cache->ac_uaddr; 351 rwlock_unlock(&rpcbaddr_cache_lock); 352 return (client); 353 } 354 addr_to_delete.len = addr->len; 355 addr_to_delete.buf = malloc(addr->len); 356 if (addr_to_delete.buf == NULL) { 357 addr_to_delete.len = 0; 358 } else { 359 memcpy(addr_to_delete.buf, addr->buf, addr->len); 360 } 361 } 362 rwlock_unlock(&rpcbaddr_cache_lock); 363 if (addr_to_delete.len != 0) { 364 /* 365 * Assume this may be due to cache data being 366 * outdated 367 */ 368 rwlock_wrlock(&rpcbaddr_cache_lock); 369 delete_cache(&addr_to_delete); 370 rwlock_unlock(&rpcbaddr_cache_lock); 371 free(addr_to_delete.buf); 372 } 373 if (!__rpc_nconf2sockinfo(nconf, &si)) { 374 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 375 return NULL; 376 } 377 378 memset(&hints, 0, sizeof hints); 379 hints.ai_family = si.si_af; 380 hints.ai_socktype = si.si_socktype; 381 hints.ai_protocol = si.si_proto; 382 383#ifdef CLNT_DEBUG 384 printf("trying netid %s family %d proto %d socktype %d\n", 385 nconf->nc_netid, si.si_af, si.si_proto, si.si_socktype); 386#endif 387 388 if (getaddrinfo(host, "sunrpc", &hints, &res) != 0) { 389 rpc_createerr.cf_stat = RPC_UNKNOWNHOST; 390 return NULL; 391 } 392 393 for (tres = res; tres != NULL; tres = tres->ai_next) { 394 taddr.buf = tres->ai_addr; 395 taddr.len = taddr.maxlen = tres->ai_addrlen; 396 397#ifdef ND_DEBUG 398 { 399 char *ua; 400 401 ua = taddr2uaddr(nconf, &taddr); 402 fprintf(stderr, "Got it [%s]\n", ua); 403 free(ua); 404 } 405#endif 406 407#ifdef ND_DEBUG 408 { 409 int i; 410 411 fprintf(stderr, "\tnetbuf len = %d, maxlen = %d\n", 412 taddr.len, taddr.maxlen); 413 fprintf(stderr, "\tAddress is "); 414 for (i = 0; i < taddr.len; i++) 415 fprintf(stderr, "%u.", ((char *)(taddr.buf))[i]); 416 fprintf(stderr, "\n"); 417 } 418#endif 419 client = clnt_tli_create(RPC_ANYFD, nconf, &taddr, 420 (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0); 421#ifdef ND_DEBUG 422 if (! client) { 423 clnt_pcreateerror("rpcbind clnt interface"); 424 } 425#endif 426 427 if (client) { 428 tmpaddr = targaddr ? taddr2uaddr(nconf, &taddr) : NULL; 429 add_cache(host, nconf->nc_netid, &taddr, tmpaddr); 430 if (targaddr) 431 *targaddr = tmpaddr; 432 break; 433 } 434 } 435 freeaddrinfo(res); 436 return (client); 437} 438 439/* XXX */ 440#define IN4_LOCALHOST_STRING "127.0.0.1" 441#define IN6_LOCALHOST_STRING "::1" 442 443/* 444 * This routine will return a client handle that is connected to the local 445 * rpcbind. Returns NULL on error and free's everything. 446 */ 447static CLIENT * 448local_rpcb() 449{ 450 CLIENT *client; 451 static struct netconfig *loopnconf; 452 static const char *hostname; 453#ifdef _REENTRANT 454 extern mutex_t loopnconf_lock; 455#endif 456 int sock; 457 size_t tsize; 458 struct netbuf nbuf; 459 struct sockaddr_un sun; 460 461 /* 462 * Try connecting to the local rpcbind through a local socket 463 * first. If this doesn't work, try all transports defined in 464 * the netconfig file. 465 */ 466 memset(&sun, 0, sizeof sun); 467 sock = socket(AF_LOCAL, SOCK_STREAM, 0); 468 if (sock < 0) 469 goto try_nconf; 470 sun.sun_family = AF_LOCAL; 471 strcpy(sun.sun_path, _PATH_RPCBINDSOCK); 472 nbuf.len = sun.sun_len = SUN_LEN(&sun); 473 nbuf.maxlen = sizeof (struct sockaddr_un); 474 nbuf.buf = &sun; 475 476 tsize = __rpc_get_t_size(AF_LOCAL, 0, 0); 477 client = clnt_vc_create(sock, &nbuf, (rpcprog_t)RPCBPROG, 478 (rpcvers_t)RPCBVERS, tsize, tsize); 479 480 if (client != NULL) { 481 /* XXX - mark the socket to be closed in destructor */ 482 (void) CLNT_CONTROL(client, CLSET_FD_CLOSE, NULL); 483 return client; 484 } 485 486 /* XXX - nobody needs this socket anymore, free the descriptor */ 487 rump_sys_close(sock); 488 489try_nconf: 490 491/* VARIABLES PROTECTED BY loopnconf_lock: loopnconf */ 492 mutex_lock(&loopnconf_lock); 493 if (loopnconf == NULL) { 494 struct netconfig *nconf, *tmpnconf = NULL; 495 void *nc_handle; 496 int fd; 497 498 nc_handle = setnetconfig(); 499 if (nc_handle == NULL) { 500 /* fails to open netconfig file */ 501 syslog (LOG_ERR, "rpc: failed to open " NETCONFIG); 502 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 503 mutex_unlock(&loopnconf_lock); 504 return (NULL); 505 } 506 while ((nconf = getnetconfig(nc_handle)) != NULL) { 507#ifdef INET6 508 if ((strcmp(nconf->nc_protofmly, NC_INET6) == 0 || 509#else 510 if (( 511#endif 512 strcmp(nconf->nc_protofmly, NC_INET) == 0) && 513 (nconf->nc_semantics == NC_TPI_COTS || 514 nconf->nc_semantics == NC_TPI_COTS_ORD)) { 515 fd = __rpc_nconf2fd(nconf); 516 /* 517 * Can't create a socket, assume that 518 * this family isn't configured in the kernel. 519 */ 520 if (fd < 0) 521 continue; 522 rump_sys_close(fd); 523 tmpnconf = nconf; 524 if (!strcmp(nconf->nc_protofmly, NC_INET)) 525 hostname = IN4_LOCALHOST_STRING; 526 else 527 hostname = IN6_LOCALHOST_STRING; 528 } 529 } 530 if (tmpnconf == NULL) { 531 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 532 mutex_unlock(&loopnconf_lock); 533 return (NULL); 534 } 535 loopnconf = getnetconfigent(tmpnconf->nc_netid); 536 /* loopnconf is never freed */ 537 endnetconfig(nc_handle); 538 } 539 mutex_unlock(&loopnconf_lock); 540 client = getclnthandle(hostname, loopnconf, NULL); 541 return (client); 542} 543 544/* 545 * Set a mapping between program, version and address. 546 * Calls the rpcbind service to do the mapping. 547 */ 548bool_t 549rpcb_set(program, version, nconf, address) 550 rpcprog_t program; 551 rpcvers_t version; 552 const struct netconfig *nconf; /* Network structure of transport */ 553 const struct netbuf *address; /* Services netconfig address */ 554{ 555 CLIENT *client; 556 bool_t rslt = FALSE; 557 RPCB parms; 558 char uidbuf[32]; 559 560 /* parameter checking */ 561 if (nconf == NULL) { 562 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 563 return (FALSE); 564 } 565 if (address == NULL) { 566 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 567 return (FALSE); 568 } 569 570 client = local_rpcb(); 571 if (! client) { 572 return (FALSE); 573 } 574 575 /* convert to universal */ 576 parms.r_addr = taddr2uaddr(__UNCONST(nconf), __UNCONST(address)); 577 if (!parms.r_addr) { 578 CLNT_DESTROY(client); 579 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE; 580 return (FALSE); /* no universal address */ 581 } 582 parms.r_prog = program; 583 parms.r_vers = version; 584 parms.r_netid = nconf->nc_netid; 585 /* 586 * Though uid is not being used directly, we still send it for 587 * completeness. For non-unix platforms, perhaps some other 588 * string or an empty string can be sent. 589 */ 590 (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid()); 591 parms.r_owner = uidbuf; 592 593 CLNT_CALL(client, (rpcproc_t)RPCBPROC_SET, (xdrproc_t) xdr_rpcb, 594 (char *)(void *)&parms, (xdrproc_t) xdr_bool, 595 (char *)(void *)&rslt, tottimeout); 596 597 CLNT_DESTROY(client); 598 free(parms.r_addr); 599 return (rslt); 600} 601 602/* 603 * Remove the mapping between program, version and netbuf address. 604 * Calls the rpcbind service to do the un-mapping. 605 * If netbuf is NULL, unset for all the transports, otherwise unset 606 * only for the given transport. 607 */ 608bool_t 609rpcb_unset(program, version, nconf) 610 rpcprog_t program; 611 rpcvers_t version; 612 const struct netconfig *nconf; 613{ 614 CLIENT *client; 615 bool_t rslt = FALSE; 616 RPCB parms; 617 char uidbuf[32]; 618 619 client = local_rpcb(); 620 if (! client) { 621 return (FALSE); 622 } 623 624 parms.r_prog = program; 625 parms.r_vers = version; 626 if (nconf) 627 parms.r_netid = nconf->nc_netid; 628 else { 629 parms.r_netid = __UNCONST(&nullstring[0]); /* unsets all */ 630 } 631 parms.r_addr = __UNCONST(&nullstring[0]); 632 (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid()); 633 parms.r_owner = uidbuf; 634 635 CLNT_CALL(client, (rpcproc_t)RPCBPROC_UNSET, (xdrproc_t) xdr_rpcb, 636 (char *)(void *)&parms, (xdrproc_t) xdr_bool, 637 (char *)(void *)&rslt, tottimeout); 638 639 CLNT_DESTROY(client); 640 return (rslt); 641} 642 643/* 644 * From the merged list, find the appropriate entry 645 */ 646static struct netbuf * 647got_entry(relp, nconf) 648 rpcb_entry_list_ptr relp; 649 const struct netconfig *nconf; 650{ 651 struct netbuf *na = NULL; 652 rpcb_entry_list_ptr sp; 653 rpcb_entry *rmap; 654 655 _DIAGASSERT(nconf != NULL); 656 657 for (sp = relp; sp != NULL; sp = sp->rpcb_entry_next) { 658 rmap = &sp->rpcb_entry_map; 659 if ((strcmp(nconf->nc_proto, rmap->r_nc_proto) == 0) && 660 (strcmp(nconf->nc_protofmly, rmap->r_nc_protofmly) == 0) && 661 (nconf->nc_semantics == rmap->r_nc_semantics) && 662 (rmap->r_maddr != NULL) && (rmap->r_maddr[0] != 0)) { 663 na = uaddr2taddr(nconf, rmap->r_maddr); 664#ifdef ND_DEBUG 665 fprintf(stderr, "\tRemote address is [%s].\n", 666 rmap->r_maddr); 667 if (!na) 668 fprintf(stderr, 669 "\tCouldn't resolve remote address!\n"); 670#endif 671 break; 672 } 673 } 674 return (na); 675} 676 677/* 678 * An internal function which optimizes rpcb_getaddr function. It also 679 * returns the client handle that it uses to contact the remote rpcbind. 680 * 681 * The algorithm used: If the transports is TCP or UDP, it first tries 682 * version 2 (portmap), 4 and then 3 (svr4). This order should be 683 * changed in the next OS release to 4, 2 and 3. We are assuming that by 684 * that time, version 4 would be available on many machines on the network. 685 * With this algorithm, we get performance as well as a plan for 686 * obsoleting version 2. 687 * 688 * For all other transports, the algorithm remains as 4 and then 3. 689 * 690 * XXX: Due to some problems with t_connect(), we do not reuse the same client 691 * handle for COTS cases and hence in these cases we do not return the 692 * client handle. This code will change if t_connect() ever 693 * starts working properly. Also look under clnt_vc.c. 694 */ 695struct netbuf * 696__rpcb_findaddr(program, version, nconf, host, clpp) 697 rpcprog_t program; 698 rpcvers_t version; 699 const struct netconfig *nconf; 700 const char *host; 701 CLIENT **clpp; 702{ 703 CLIENT *client = NULL; 704 RPCB parms; 705 enum clnt_stat clnt_st; 706 char *ua = NULL; 707 rpcvers_t vers; 708 struct netbuf *address = NULL; 709 rpcvers_t start_vers = RPCBVERS4; 710 struct netbuf servaddr; 711 712 /* nconf is handled below */ 713 _DIAGASSERT(host != NULL); 714 /* clpp may be NULL */ 715 716 /* parameter checking */ 717 if (nconf == NULL) { 718 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 719 return (NULL); 720 } 721 722 parms.r_addr = NULL; 723 724#ifdef PORTMAP 725 /* Try version 2 for TCP or UDP */ 726 if (strcmp(nconf->nc_protofmly, NC_INET) == 0) { 727 u_short port = 0; 728 struct netbuf remote; 729 rpcvers_t pmapvers = 2; 730 struct pmap pmapparms; 731 732 /* 733 * Try UDP only - there are some portmappers out 734 * there that use UDP only. 735 */ 736 if (strcmp(nconf->nc_proto, NC_TCP) == 0) { 737 struct netconfig *newnconf; 738 739 if ((newnconf = getnetconfigent("udp")) == NULL) { 740 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 741 return (NULL); 742 } 743 client = getclnthandle(host, newnconf, &parms.r_addr); 744 freenetconfigent(newnconf); 745 } else { 746 client = getclnthandle(host, nconf, &parms.r_addr); 747 } 748 if (client == NULL) { 749 return (NULL); 750 } 751 752 /* Set the version */ 753 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&pmapvers); 754 pmapparms.pm_prog = program; 755 pmapparms.pm_vers = version; 756 pmapparms.pm_prot = strcmp(nconf->nc_proto, NC_TCP) ? 757 IPPROTO_UDP : IPPROTO_TCP; 758 pmapparms.pm_port = 0; /* not needed */ 759 clnt_st = CLNT_CALL(client, (rpcproc_t)PMAPPROC_GETPORT, 760 (xdrproc_t) xdr_pmap, (caddr_t)(void *)&pmapparms, 761 (xdrproc_t) xdr_u_short, (caddr_t)(void *)&port, 762 tottimeout); 763 if (clnt_st != RPC_SUCCESS) { 764 if ((clnt_st == RPC_PROGVERSMISMATCH) || 765 (clnt_st == RPC_PROGUNAVAIL)) 766 goto try_rpcbind; /* Try different versions */ 767 rpc_createerr.cf_stat = RPC_PMAPFAILURE; 768 clnt_geterr(client, &rpc_createerr.cf_error); 769 goto error; 770 } else if (port == 0) { 771 address = NULL; 772 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 773 goto error; 774 } 775 port = htons(port); 776 CLNT_CONTROL(client, CLGET_SVC_ADDR, (char *)(void *)&remote); 777 if (((address = malloc(sizeof(struct netbuf))) == NULL) || 778 ((address->buf = malloc(remote.len)) == NULL)) { 779 rpc_createerr.cf_stat = RPC_SYSTEMERROR; 780 clnt_geterr(client, &rpc_createerr.cf_error); 781 if (address) { 782 free(address); 783 address = NULL; 784 } 785 goto error; 786 } 787 memcpy(address->buf, remote.buf, remote.len); 788 memcpy(&((char *)address->buf)[sizeof (short)], 789 (char *)(void *)&port, sizeof (short)); 790 address->len = address->maxlen = remote.len; 791 goto done; 792 } 793#endif 794 795try_rpcbind: 796 /* 797 * Now we try version 4 and then 3. 798 * We also send the remote system the address we used to 799 * contact it in case it can help to connect back with us 800 */ 801 parms.r_prog = program; 802 parms.r_vers = version; 803 parms.r_owner = __UNCONST(&nullstring[0]); /* not needed; */ 804 /* just for xdring */ 805 parms.r_netid = nconf->nc_netid; /* not really needed */ 806 807 /* 808 * If a COTS transport is being used, try getting address via CLTS 809 * transport. This works only with version 4. 810 * NOTE: This is being done for all transports EXCEPT LOOPBACK 811 * because with loopback the cost to go to a COTS is same as 812 * the cost to go through CLTS, plus you get the advantage of 813 * finding out immediately if the local rpcbind process is dead. 814 */ 815#if 1 816 if ((nconf->nc_semantics == NC_TPI_COTS_ORD || 817 nconf->nc_semantics == NC_TPI_COTS) && 818 (strcmp(nconf->nc_protofmly, NC_LOOPBACK) != 0)) 819#else 820 if (client != NULL) { 821 CLNT_DESTROY(client); 822 client = NULL; 823 } 824 if (nconf->nc_semantics == NC_TPI_CLTS) 825#endif 826 { 827 void *handle; 828 struct netconfig *nconf_clts; 829 rpcb_entry_list_ptr relp = NULL; 830 831 if (client == NULL) { 832 /* This did not go through the above PORTMAP/TCP code */ 833#if 1 834 if ((handle = __rpc_setconf("datagram_v")) != NULL) 835#else 836 if ((handle = __rpc_setconf("circuit_v")) != NULL) 837#endif 838 { 839 while ((nconf_clts = __rpc_getconf(handle)) 840 != NULL) { 841 if (strcmp(nconf_clts->nc_protofmly, 842 nconf->nc_protofmly) != 0) { 843 continue; 844 } 845 client = getclnthandle(host, nconf_clts, 846 &parms.r_addr); 847 break; 848 } 849 __rpc_endconf(handle); 850 } 851 if (client == NULL) 852 goto regular_rpcbind; /* Go the regular way */ 853 } else { 854 /* This is a UDP PORTMAP handle. Change to version 4 */ 855 vers = RPCBVERS4; 856 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 857 } 858 /* 859 * We also send the remote system the address we used to 860 * contact it in case it can help it connect back with us 861 */ 862 if (parms.r_addr == NULL) { 863 /* for XDRing */ 864 parms.r_addr = __UNCONST(&nullstring[0]); 865 } 866 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDRLIST, 867 (xdrproc_t) xdr_rpcb, (char *)(void *)&parms, 868 (xdrproc_t) xdr_rpcb_entry_list_ptr, 869 (char *)(void *)&relp, tottimeout); 870 if (clnt_st == RPC_SUCCESS) { 871 if ((address = got_entry(relp, nconf)) != NULL) { 872 xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr, 873 (char *)(void *)&relp); 874 CLNT_CONTROL(client, CLGET_SVC_ADDR, 875 (char *)(void *)&servaddr); 876 __rpc_fixup_addr(address, &servaddr); 877 goto done; 878 } 879 /* Entry not found for this transport */ 880 xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr, 881 (char *)(void *)&relp); 882 /* 883 * XXX: should have perhaps returned with error but 884 * since the remote machine might not always be able 885 * to send the address on all transports, we try the 886 * regular way with regular_rpcbind 887 */ 888 goto regular_rpcbind; 889 } else if ((clnt_st == RPC_PROGVERSMISMATCH) || 890 (clnt_st == RPC_PROGUNAVAIL)) { 891 start_vers = RPCBVERS; /* Try version 3 now */ 892 goto regular_rpcbind; /* Try different versions */ 893 } else { 894 rpc_createerr.cf_stat = RPC_PMAPFAILURE; 895 clnt_geterr(client, &rpc_createerr.cf_error); 896 goto error; 897 } 898 } 899 900regular_rpcbind: 901 902 /* Now the same transport is to be used to get the address */ 903#if 1 904 if (client && ((nconf->nc_semantics == NC_TPI_COTS_ORD) || 905 (nconf->nc_semantics == NC_TPI_COTS))) 906#else 907 if (client && nconf->nc_semantics == NC_TPI_CLTS) 908#endif 909 { 910 /* A CLTS type of client - destroy it */ 911 CLNT_DESTROY(client); 912 client = NULL; 913 } 914 915 if (client == NULL) { 916 client = getclnthandle(host, nconf, &parms.r_addr); 917 if (client == NULL) { 918 goto error; 919 } 920 } 921 if (parms.r_addr == NULL) 922 parms.r_addr = __UNCONST(&nullstring[0]); 923 924 /* First try from start_vers and then version 3 (RPCBVERS) */ 925 for (vers = start_vers; vers >= RPCBVERS; vers--) { 926 /* Set the version */ 927 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 928 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDR, 929 (xdrproc_t) xdr_rpcb, (char *)(void *)&parms, 930 (xdrproc_t) xdr_wrapstring, (char *)(void *) &ua, 931 tottimeout); 932 if (clnt_st == RPC_SUCCESS) { 933 if ((ua == NULL) || (ua[0] == 0)) { 934 /* address unknown */ 935 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 936 goto error; 937 } 938 address = uaddr2taddr(nconf, ua); 939#ifdef ND_DEBUG 940 fprintf(stderr, "\tRemote address is [%s]\n", ua); 941 if (!address) 942 fprintf(stderr, 943 "\tCouldn't resolve remote address!\n"); 944#endif 945 xdr_free((xdrproc_t)xdr_wrapstring, 946 (char *)(void *)&ua); 947 948 if (! address) { 949 /* We don't know about your universal address */ 950 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE; 951 goto error; 952 } 953 CLNT_CONTROL(client, CLGET_SVC_ADDR, 954 (char *)(void *)&servaddr); 955 __rpc_fixup_addr(address, &servaddr); 956 goto done; 957 } else if (clnt_st == RPC_PROGVERSMISMATCH) { 958 struct rpc_err rpcerr; 959 960 clnt_geterr(client, &rpcerr); 961 if (rpcerr.re_vers.low > RPCBVERS4) 962 goto error; /* a new version, can't handle */ 963 } else if (clnt_st != RPC_PROGUNAVAIL) { 964 /* Cant handle this error */ 965 rpc_createerr.cf_stat = clnt_st; 966 clnt_geterr(client, &rpc_createerr.cf_error); 967 goto error; 968 } 969 } 970 971error: 972 if (client) { 973 CLNT_DESTROY(client); 974 client = NULL; 975 } 976done: 977 if (nconf->nc_semantics != NC_TPI_CLTS) { 978 /* This client is the connectionless one */ 979 if (client) { 980 CLNT_DESTROY(client); 981 client = NULL; 982 } 983 } 984 if (clpp) { 985 *clpp = client; 986 } else if (client) { 987 CLNT_DESTROY(client); 988 } 989 return (address); 990} 991 992 993/* 994 * Find the mapped address for program, version. 995 * Calls the rpcbind service remotely to do the lookup. 996 * Uses the transport specified in nconf. 997 * Returns FALSE (0) if no map exists, else returns 1. 998 * 999 * Assuming that the address is all properly allocated 1000 */ 1001int 1002rpcb_getaddr(program, version, nconf, address, host) 1003 rpcprog_t program; 1004 rpcvers_t version; 1005 const struct netconfig *nconf; 1006 struct netbuf *address; 1007 const char *host; 1008{ 1009 struct netbuf *na; 1010 1011 _DIAGASSERT(address != NULL); 1012 1013 if ((na = __rpcb_findaddr(program, version, nconf, 1014 host, NULL)) == NULL) 1015 return (FALSE); 1016 1017 if (na->len > address->maxlen) { 1018 /* Too long address */ 1019 free(na->buf); 1020 free(na); 1021 rpc_createerr.cf_stat = RPC_FAILED; 1022 return (FALSE); 1023 } 1024 memcpy(address->buf, na->buf, (size_t)na->len); 1025 address->len = na->len; 1026 free(na->buf); 1027 free(na); 1028 return (TRUE); 1029} 1030 1031/* 1032 * Get a copy of the current maps. 1033 * Calls the rpcbind service remotely to get the maps. 1034 * 1035 * It returns only a list of the services 1036 * It returns NULL on failure. 1037 */ 1038rpcblist * 1039rpcb_getmaps(nconf, host) 1040 const struct netconfig *nconf; 1041 const char *host; 1042{ 1043 rpcblist_ptr head = NULL; 1044 CLIENT *client; 1045 enum clnt_stat clnt_st; 1046 rpcvers_t vers = 0; 1047 1048 client = getclnthandle(host, nconf, NULL); 1049 if (client == NULL) { 1050 return (head); 1051 } 1052 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP, 1053 (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr, 1054 (char *)(void *)&head, tottimeout); 1055 if (clnt_st == RPC_SUCCESS) 1056 goto done; 1057 1058 if ((clnt_st != RPC_PROGVERSMISMATCH) && 1059 (clnt_st != RPC_PROGUNAVAIL)) { 1060 rpc_createerr.cf_stat = RPC_RPCBFAILURE; 1061 clnt_geterr(client, &rpc_createerr.cf_error); 1062 goto done; 1063 } 1064 1065 /* fall back to earlier version */ 1066 CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers); 1067 if (vers == RPCBVERS4) { 1068 vers = RPCBVERS; 1069 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 1070 if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP, 1071 (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr, 1072 (char *)(void *)&head, tottimeout) == RPC_SUCCESS) 1073 goto done; 1074 } 1075 rpc_createerr.cf_stat = RPC_RPCBFAILURE; 1076 clnt_geterr(client, &rpc_createerr.cf_error); 1077 1078done: 1079 CLNT_DESTROY(client); 1080 return (head); 1081} 1082 1083/* 1084 * rpcbinder remote-call-service interface. 1085 * This routine is used to call the rpcbind remote call service 1086 * which will look up a service program in the address maps, and then 1087 * remotely call that routine with the given parameters. This allows 1088 * programs to do a lookup and call in one step. 1089*/ 1090enum clnt_stat 1091rpcb_rmtcall(nconf, host, prog, vers, proc, xdrargs, argsp, 1092 xdrres, resp, tout, addr_ptr) 1093 const struct netconfig *nconf; /* Netconfig structure */ 1094 const char *host; /* Remote host name */ 1095 rpcprog_t prog; 1096 rpcvers_t vers; 1097 rpcproc_t proc; /* Remote proc identifiers */ 1098 xdrproc_t xdrargs, xdrres; /* XDR routines */ 1099 const char *argsp; /* Argument */ 1100 caddr_t resp; /* Result */ 1101 struct timeval tout; /* Timeout value for this call */ 1102 const struct netbuf *addr_ptr; /* Preallocated netbuf address */ 1103{ 1104 CLIENT *client; 1105 enum clnt_stat stat; 1106 struct r_rpcb_rmtcallargs a; 1107 struct r_rpcb_rmtcallres r; 1108 rpcvers_t rpcb_vers; 1109 1110 stat = RPC_FAILED; /* XXXGCC -Wuninitialized [dreamcast] */ 1111 1112 client = getclnthandle(host, nconf, NULL); 1113 if (client == NULL) { 1114 return (RPC_FAILED); 1115 } 1116 CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, __UNCONST(&rmttimeout)); 1117 a.prog = prog; 1118 a.vers = vers; 1119 a.proc = proc; 1120 a.args.args_val = argsp; 1121 a.xdr_args = xdrargs; 1122 r.addr = NULL; 1123 r.results.results_val = resp; 1124 r.xdr_res = xdrres; 1125 1126 for (rpcb_vers = RPCBVERS4; rpcb_vers >= RPCBVERS; rpcb_vers--) { 1127 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&rpcb_vers); 1128 stat = CLNT_CALL(client, (rpcproc_t)RPCBPROC_CALLIT, 1129 (xdrproc_t) xdr_rpcb_rmtcallargs, (char *)(void *)&a, 1130 (xdrproc_t) xdr_rpcb_rmtcallres, (char *)(void *)&r, tout); 1131 if ((stat == RPC_SUCCESS) && (addr_ptr != NULL)) { 1132 struct netbuf *na; 1133 na = uaddr2taddr(__UNCONST(nconf), r.addr); 1134 if (!na) { 1135 stat = RPC_N2AXLATEFAILURE; 1136 ((struct netbuf *)__UNCONST(addr_ptr))->len = 0; 1137 goto error; 1138 } 1139 if (na->len > addr_ptr->maxlen) { 1140 /* Too long address */ 1141 stat = RPC_FAILED; /* XXX A better error no */ 1142 free(na->buf); 1143 free(na); 1144 ((struct netbuf *)__UNCONST(addr_ptr))->len = 0; 1145 goto error; 1146 } 1147 memcpy(addr_ptr->buf, na->buf, (size_t)na->len); 1148 ((struct netbuf *)__UNCONST(addr_ptr))->len = na->len; 1149 free(na->buf); 1150 free(na); 1151 break; 1152 } else if ((stat != RPC_PROGVERSMISMATCH) && 1153 (stat != RPC_PROGUNAVAIL)) { 1154 goto error; 1155 } 1156 } 1157error: 1158 CLNT_DESTROY(client); 1159 if (r.addr) 1160 xdr_free((xdrproc_t) xdr_wrapstring, (char *)(void *)&r.addr); 1161 return (stat); 1162} 1163 1164/* 1165 * Gets the time on the remote host. 1166 * Returns 1 if succeeds else 0. 1167 */ 1168bool_t 1169rpcb_gettime(host, timep) 1170 const char *host; 1171 time_t *timep; 1172{ 1173 CLIENT *client = NULL; 1174 void *handle; 1175 struct netconfig *nconf; 1176 rpcvers_t vers; 1177 enum clnt_stat st; 1178 1179 1180 if ((host == NULL) || (host[0] == 0)) { 1181 time(timep); 1182 return (TRUE); 1183 } 1184 1185 if ((handle = __rpc_setconf("netpath")) == NULL) { 1186 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1187 return (FALSE); 1188 } 1189 rpc_createerr.cf_stat = RPC_SUCCESS; 1190 while (client == NULL) { 1191 if ((nconf = __rpc_getconf(handle)) == NULL) { 1192 if (rpc_createerr.cf_stat == RPC_SUCCESS) 1193 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1194 break; 1195 } 1196 client = getclnthandle(host, nconf, NULL); 1197 if (client) 1198 break; 1199 } 1200 __rpc_endconf(handle); 1201 if (client == NULL) { 1202 return (FALSE); 1203 } 1204 1205 st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME, 1206 (xdrproc_t) xdr_void, NULL, 1207 (xdrproc_t) xdr_int, (char *)(void *)timep, tottimeout); 1208 1209 if ((st == RPC_PROGVERSMISMATCH) || (st == RPC_PROGUNAVAIL)) { 1210 CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers); 1211 if (vers == RPCBVERS4) { 1212 /* fall back to earlier version */ 1213 vers = RPCBVERS; 1214 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 1215 st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME, 1216 (xdrproc_t) xdr_void, NULL, 1217 (xdrproc_t) xdr_int, (char *)(void *)timep, 1218 tottimeout); 1219 } 1220 } 1221 CLNT_DESTROY(client); 1222 return (st == RPC_SUCCESS? TRUE: FALSE); 1223} 1224 1225/* 1226 * Converts taddr to universal address. This routine should never 1227 * really be called because local n2a libraries are always provided. 1228 */ 1229char * 1230rpcb_taddr2uaddr(nconf, taddr) 1231 struct netconfig *nconf; 1232 struct netbuf *taddr; 1233{ 1234 CLIENT *client; 1235 char *uaddr = NULL; 1236 1237 1238 /* parameter checking */ 1239 if (nconf == NULL) { 1240 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1241 return (NULL); 1242 } 1243 if (taddr == NULL) { 1244 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 1245 return (NULL); 1246 } 1247 client = local_rpcb(); 1248 if (! client) { 1249 return (NULL); 1250 } 1251 1252 CLNT_CALL(client, (rpcproc_t)RPCBPROC_TADDR2UADDR, 1253 (xdrproc_t) xdr_netbuf, (char *)(void *)taddr, 1254 (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr, tottimeout); 1255 CLNT_DESTROY(client); 1256 return (uaddr); 1257} 1258 1259/* 1260 * Converts universal address to netbuf. This routine should never 1261 * really be called because local n2a libraries are always provided. 1262 */ 1263struct netbuf * 1264rpcb_uaddr2taddr(nconf, uaddr) 1265 struct netconfig *nconf; 1266 char *uaddr; 1267{ 1268 CLIENT *client; 1269 struct netbuf *taddr; 1270 1271 1272 /* parameter checking */ 1273 if (nconf == NULL) { 1274 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1275 return (NULL); 1276 } 1277 if (uaddr == NULL) { 1278 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 1279 return (NULL); 1280 } 1281 client = local_rpcb(); 1282 if (! client) { 1283 return (NULL); 1284 } 1285 1286 taddr = (struct netbuf *)calloc(1, sizeof (struct netbuf)); 1287 if (taddr == NULL) { 1288 CLNT_DESTROY(client); 1289 return (NULL); 1290 } 1291 if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_UADDR2TADDR, 1292 (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr, 1293 (xdrproc_t) xdr_netbuf, (char *)(void *)taddr, 1294 tottimeout) != RPC_SUCCESS) { 1295 free(taddr); 1296 taddr = NULL; 1297 } 1298 CLNT_DESTROY(client); 1299 return (taddr); 1300} 1301