1 /* $NetBSD: rpcb_clnt.c,v 1.23 2008/04/25 23:51:41 dogcow 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 40 static char sccsid[] = "@(#)rpcb_clnt.c 1.30 89/06/21 Copyr 1988 Sun Micro"; 41 #else 42 __RCSID("$NetBSD: rpcb_clnt.c,v 1.23 2008/04/25 23:51:41 dogcow 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 "rpc_internal.h" 77 78 #ifdef __weak_alias 79 __weak_alias(rpcb_set,_rpcb_set) 80 __weak_alias(rpcb_unset,_rpcb_unset) 81 __weak_alias(rpcb_getmaps,_rpcb_getmaps) 82 __weak_alias(rpcb_rmtcall,_rpcb_rmtcall) 83 __weak_alias(rpcb_gettime,_rpcb_gettime) 84 __weak_alias(rpcb_taddr2uaddr,_rpcb_taddr2uaddr) 85 __weak_alias(rpcb_uaddr2taddr,_rpcb_uaddr2taddr) 86 #endif 87 88 static struct timeval tottimeout = { 60, 0 }; 89 static const struct timeval rmttimeout = { 3, 0 }; 90 91 static const char nullstring[] = "\000"; 92 93 #define CACHESIZE 6 94 95 struct address_cache { 96 char *ac_host; 97 char *ac_netid; 98 char *ac_uaddr; 99 struct netbuf *ac_taddr; 100 struct address_cache *ac_next; 101 }; 102 103 static struct address_cache *front; 104 static int cachesize; 105 106 #define CLCR_GET_RPCB_TIMEOUT 1 107 #define CLCR_SET_RPCB_TIMEOUT 2 108 109 110 extern int __rpc_lowvers; 111 112 static struct address_cache *check_cache __P((const char *, const char *)); 113 static void delete_cache __P((struct netbuf *)); 114 static void add_cache __P((const char *, const char *, struct netbuf *, 115 char *)); 116 static CLIENT *getclnthandle __P((const char *, const struct netconfig *, 117 char **)); 118 static CLIENT *local_rpcb __P((void)); 119 static struct netbuf *got_entry __P((rpcb_entry_list_ptr, 120 const struct netconfig *)); 121 122 /* 123 * This routine adjusts the timeout used for calls to the remote rpcbind. 124 * Also, this routine can be used to set the use of portmapper version 2 125 * only when doing rpc_broadcasts 126 * These are private routines that may not be provided in future releases. 127 */ 128 bool_t 129 __rpc_control(request, info) 130 int request; 131 void *info; 132 { 133 134 _DIAGASSERT(info != NULL); 135 136 switch (request) { 137 case CLCR_GET_RPCB_TIMEOUT: 138 *(struct timeval *)info = tottimeout; 139 break; 140 case CLCR_SET_RPCB_TIMEOUT: 141 tottimeout = *(struct timeval *)info; 142 break; 143 case CLCR_SET_LOWVERS: 144 __rpc_lowvers = *(int *)info; 145 break; 146 case CLCR_GET_LOWVERS: 147 *(int *)info = __rpc_lowvers; 148 break; 149 default: 150 return (FALSE); 151 } 152 return (TRUE); 153 } 154 155 /* 156 * It might seem that a reader/writer lock would be more reasonable here. 157 * However because getclnthandle(), the only user of the cache functions, 158 * may do a delete_cache() operation if a check_cache() fails to return an 159 * address useful to clnt_tli_create(), we may as well use a mutex. 160 */ 161 /* 162 * As it turns out, if the cache lock is *not* a reader/writer lock, we will 163 * block all clnt_create's if we are trying to connect to a host that's down, 164 * since the lock will be held all during that time. 165 */ 166 #ifdef _REENTRANT 167 extern rwlock_t rpcbaddr_cache_lock; 168 #endif 169 170 /* 171 * The routines check_cache(), add_cache(), delete_cache() manage the 172 * cache of rpcbind addresses for (host, netid). 173 */ 174 175 static struct address_cache * 176 check_cache(host, netid) 177 const char *host, *netid; 178 { 179 struct address_cache *cptr; 180 181 _DIAGASSERT(host != NULL); 182 _DIAGASSERT(netid != NULL); 183 184 /* READ LOCK HELD ON ENTRY: rpcbaddr_cache_lock */ 185 186 for (cptr = front; cptr != NULL; cptr = cptr->ac_next) { 187 if (!strcmp(cptr->ac_host, host) && 188 !strcmp(cptr->ac_netid, netid)) { 189 #ifdef ND_DEBUG 190 fprintf(stderr, "Found cache entry for %s: %s\n", 191 host, netid); 192 #endif 193 return (cptr); 194 } 195 } 196 return NULL; 197 } 198 199 static void 200 delete_cache(addr) 201 struct netbuf *addr; 202 { 203 struct address_cache *cptr, *prevptr = NULL; 204 205 _DIAGASSERT(addr != NULL); 206 207 /* WRITE LOCK HELD ON ENTRY: rpcbaddr_cache_lock */ 208 for (cptr = front; cptr != NULL; cptr = cptr->ac_next) { 209 if (!memcmp(cptr->ac_taddr->buf, addr->buf, addr->len)) { 210 free(cptr->ac_host); 211 free(cptr->ac_netid); 212 free(cptr->ac_taddr->buf); 213 free(cptr->ac_taddr); 214 if (cptr->ac_uaddr) 215 free(cptr->ac_uaddr); 216 if (prevptr) 217 prevptr->ac_next = cptr->ac_next; 218 else 219 front = cptr->ac_next; 220 free(cptr); 221 cachesize--; 222 break; 223 } 224 prevptr = cptr; 225 } 226 } 227 228 static void 229 add_cache(host, netid, taddr, uaddr) 230 const char *host, *netid; 231 char *uaddr; 232 struct netbuf *taddr; 233 { 234 struct address_cache *ad_cache, *cptr, *prevptr; 235 236 _DIAGASSERT(host != NULL); 237 _DIAGASSERT(netid != NULL); 238 /* uaddr may be NULL */ 239 /* taddr may be NULL ??? */ 240 241 ad_cache = malloc(sizeof(*ad_cache)); 242 if (!ad_cache) { 243 return; 244 } 245 ad_cache->ac_host = strdup(host); 246 ad_cache->ac_netid = strdup(netid); 247 ad_cache->ac_uaddr = uaddr ? strdup(uaddr) : NULL; 248 ad_cache->ac_taddr = malloc(sizeof(*ad_cache->ac_taddr)); 249 if (!ad_cache->ac_host || !ad_cache->ac_netid || !ad_cache->ac_taddr || 250 (uaddr && !ad_cache->ac_uaddr)) { 251 goto out; 252 } 253 ad_cache->ac_taddr->len = ad_cache->ac_taddr->maxlen = taddr->len; 254 ad_cache->ac_taddr->buf = malloc(taddr->len); 255 if (ad_cache->ac_taddr->buf == NULL) { 256 out: 257 if (ad_cache->ac_host) 258 free(ad_cache->ac_host); 259 if (ad_cache->ac_netid) 260 free(ad_cache->ac_netid); 261 if (ad_cache->ac_uaddr) 262 free(ad_cache->ac_uaddr); 263 if (ad_cache->ac_taddr) 264 free(ad_cache->ac_taddr); 265 free(ad_cache); 266 return; 267 } 268 memcpy(ad_cache->ac_taddr->buf, taddr->buf, taddr->len); 269 #ifdef ND_DEBUG 270 fprintf(stderr, "Added to cache: %s : %s\n", host, netid); 271 #endif 272 273 /* VARIABLES PROTECTED BY rpcbaddr_cache_lock: cptr */ 274 275 rwlock_wrlock(&rpcbaddr_cache_lock); 276 if (cachesize < CACHESIZE) { 277 ad_cache->ac_next = front; 278 front = ad_cache; 279 cachesize++; 280 } else { 281 /* Free the last entry */ 282 cptr = front; 283 prevptr = NULL; 284 while (cptr->ac_next) { 285 prevptr = cptr; 286 cptr = cptr->ac_next; 287 } 288 289 #ifdef ND_DEBUG 290 fprintf(stderr, "Deleted from cache: %s : %s\n", 291 cptr->ac_host, cptr->ac_netid); 292 #endif 293 free(cptr->ac_host); 294 free(cptr->ac_netid); 295 free(cptr->ac_taddr->buf); 296 free(cptr->ac_taddr); 297 if (cptr->ac_uaddr) 298 free(cptr->ac_uaddr); 299 300 if (prevptr) { 301 prevptr->ac_next = NULL; 302 ad_cache->ac_next = front; 303 front = ad_cache; 304 } else { 305 front = ad_cache; 306 ad_cache->ac_next = NULL; 307 } 308 free(cptr); 309 } 310 rwlock_unlock(&rpcbaddr_cache_lock); 311 } 312 313 /* 314 * This routine will return a client handle that is connected to the 315 * rpcbind. Returns NULL on error and free's everything. 316 */ 317 static CLIENT * 318 getclnthandle(host, nconf, targaddr) 319 const char *host; 320 const struct netconfig *nconf; 321 char **targaddr; 322 { 323 CLIENT *client; 324 struct netbuf *addr, taddr; 325 struct netbuf addr_to_delete; 326 struct __rpc_sockinfo si; 327 struct addrinfo hints, *res, *tres; 328 struct address_cache *ad_cache; 329 char *tmpaddr; 330 331 _DIAGASSERT(host != NULL); 332 _DIAGASSERT(nconf != NULL); 333 /* targaddr may be NULL */ 334 335 /* VARIABLES PROTECTED BY rpcbaddr_cache_lock: ad_cache */ 336 337 /* Get the address of the rpcbind. Check cache first */ 338 client = NULL; 339 addr_to_delete.len = 0; 340 rwlock_rdlock(&rpcbaddr_cache_lock); 341 ad_cache = check_cache(host, nconf->nc_netid); 342 if (ad_cache != NULL) { 343 addr = ad_cache->ac_taddr; 344 client = clnt_tli_create(RPC_ANYFD, nconf, addr, 345 (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0); 346 if (client != NULL) { 347 if (targaddr) 348 *targaddr = ad_cache->ac_uaddr; 349 rwlock_unlock(&rpcbaddr_cache_lock); 350 return (client); 351 } 352 addr_to_delete.len = addr->len; 353 addr_to_delete.buf = malloc(addr->len); 354 if (addr_to_delete.buf == NULL) { 355 addr_to_delete.len = 0; 356 } else { 357 memcpy(addr_to_delete.buf, addr->buf, addr->len); 358 } 359 } 360 rwlock_unlock(&rpcbaddr_cache_lock); 361 if (addr_to_delete.len != 0) { 362 /* 363 * Assume this may be due to cache data being 364 * outdated 365 */ 366 rwlock_wrlock(&rpcbaddr_cache_lock); 367 delete_cache(&addr_to_delete); 368 rwlock_unlock(&rpcbaddr_cache_lock); 369 free(addr_to_delete.buf); 370 } 371 if (!__rpc_nconf2sockinfo(nconf, &si)) { 372 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 373 return NULL; 374 } 375 376 memset(&hints, 0, sizeof hints); 377 hints.ai_family = si.si_af; 378 hints.ai_socktype = si.si_socktype; 379 hints.ai_protocol = si.si_proto; 380 381 #ifdef CLNT_DEBUG 382 printf("trying netid %s family %d proto %d socktype %d\n", 383 nconf->nc_netid, si.si_af, si.si_proto, si.si_socktype); 384 #endif 385 386 if (getaddrinfo(host, "sunrpc", &hints, &res) != 0) { 387 rpc_createerr.cf_stat = RPC_UNKNOWNHOST; 388 return NULL; 389 } 390 391 for (tres = res; tres != NULL; tres = tres->ai_next) { 392 taddr.buf = tres->ai_addr; 393 taddr.len = taddr.maxlen = tres->ai_addrlen; 394 395 #ifdef ND_DEBUG 396 { 397 char *ua; 398 399 ua = taddr2uaddr(nconf, &taddr); 400 fprintf(stderr, "Got it [%s]\n", ua); 401 free(ua); 402 } 403 #endif 404 405 #ifdef ND_DEBUG 406 { 407 int i; 408 409 fprintf(stderr, "\tnetbuf len = %d, maxlen = %d\n", 410 taddr.len, taddr.maxlen); 411 fprintf(stderr, "\tAddress is "); 412 for (i = 0; i < taddr.len; i++) 413 fprintf(stderr, "%u.", ((char *)(taddr.buf))[i]); 414 fprintf(stderr, "\n"); 415 } 416 #endif 417 client = clnt_tli_create(RPC_ANYFD, nconf, &taddr, 418 (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0); 419 #ifdef ND_DEBUG 420 if (! client) { 421 clnt_pcreateerror("rpcbind clnt interface"); 422 } 423 #endif 424 425 if (client) { 426 tmpaddr = targaddr ? taddr2uaddr(nconf, &taddr) : NULL; 427 add_cache(host, nconf->nc_netid, &taddr, tmpaddr); 428 if (targaddr) 429 *targaddr = tmpaddr; 430 break; 431 } 432 } 433 freeaddrinfo(res); 434 return (client); 435 } 436 437 /* XXX */ 438 #define IN4_LOCALHOST_STRING "127.0.0.1" 439 #define IN6_LOCALHOST_STRING "::1" 440 441 /* 442 * This routine will return a client handle that is connected to the local 443 * rpcbind. Returns NULL on error and free's everything. 444 */ 445 static CLIENT * 446 local_rpcb() 447 { 448 CLIENT *client; 449 static struct netconfig *loopnconf; 450 static const char *hostname; 451 #ifdef _REENTRANT 452 extern mutex_t loopnconf_lock; 453 #endif 454 int sock; 455 size_t tsize; 456 struct netbuf nbuf; 457 struct sockaddr_un sun; 458 459 /* 460 * Try connecting to the local rpcbind through a local socket 461 * first. If this doesn't work, try all transports defined in 462 * the netconfig file. 463 */ 464 memset(&sun, 0, sizeof sun); 465 sock = socket(AF_LOCAL, SOCK_STREAM, 0); 466 if (sock < 0) 467 goto try_nconf; 468 sun.sun_family = AF_LOCAL; 469 strcpy(sun.sun_path, _PATH_RPCBINDSOCK); 470 nbuf.len = sun.sun_len = SUN_LEN(&sun); 471 nbuf.maxlen = sizeof (struct sockaddr_un); 472 nbuf.buf = &sun; 473 474 tsize = __rpc_get_t_size(AF_LOCAL, 0, 0); 475 client = clnt_vc_create(sock, &nbuf, (rpcprog_t)RPCBPROG, 476 (rpcvers_t)RPCBVERS, tsize, tsize); 477 478 if (client != NULL) { 479 /* XXX - mark the socket to be closed in destructor */ 480 (void) CLNT_CONTROL(client, CLSET_FD_CLOSE, NULL); 481 return client; 482 } 483 484 /* XXX - nobody needs this socket anymore, free the descriptor */ 485 close(sock); 486 487 try_nconf: 488 489 /* VARIABLES PROTECTED BY loopnconf_lock: loopnconf */ 490 mutex_lock(&loopnconf_lock); 491 if (loopnconf == NULL) { 492 struct netconfig *nconf, *tmpnconf = NULL; 493 void *nc_handle; 494 int fd; 495 496 nc_handle = setnetconfig(); 497 if (nc_handle == NULL) { 498 /* fails to open netconfig file */ 499 syslog (LOG_ERR, "rpc: failed to open " NETCONFIG); 500 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 501 mutex_unlock(&loopnconf_lock); 502 return (NULL); 503 } 504 while ((nconf = getnetconfig(nc_handle)) != NULL) { 505 #ifdef INET6 506 if ((strcmp(nconf->nc_protofmly, NC_INET6) == 0 || 507 #else 508 if (( 509 #endif 510 strcmp(nconf->nc_protofmly, NC_INET) == 0) && 511 (nconf->nc_semantics == NC_TPI_COTS || 512 nconf->nc_semantics == NC_TPI_COTS_ORD)) { 513 fd = __rpc_nconf2fd(nconf); 514 /* 515 * Can't create a socket, assume that 516 * this family isn't configured in the kernel. 517 */ 518 if (fd < 0) 519 continue; 520 close(fd); 521 tmpnconf = nconf; 522 if (!strcmp(nconf->nc_protofmly, NC_INET)) 523 hostname = IN4_LOCALHOST_STRING; 524 else 525 hostname = IN6_LOCALHOST_STRING; 526 } 527 } 528 if (tmpnconf == NULL) { 529 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 530 mutex_unlock(&loopnconf_lock); 531 return (NULL); 532 } 533 loopnconf = getnetconfigent(tmpnconf->nc_netid); 534 /* loopnconf is never freed */ 535 endnetconfig(nc_handle); 536 } 537 mutex_unlock(&loopnconf_lock); 538 client = getclnthandle(hostname, loopnconf, NULL); 539 return (client); 540 } 541 542 /* 543 * Set a mapping between program, version and address. 544 * Calls the rpcbind service to do the mapping. 545 */ 546 bool_t 547 rpcb_set(program, version, nconf, address) 548 rpcprog_t program; 549 rpcvers_t version; 550 const struct netconfig *nconf; /* Network structure of transport */ 551 const struct netbuf *address; /* Services netconfig address */ 552 { 553 CLIENT *client; 554 bool_t rslt = FALSE; 555 RPCB parms; 556 char uidbuf[32]; 557 558 /* parameter checking */ 559 if (nconf == NULL) { 560 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 561 return (FALSE); 562 } 563 if (address == NULL) { 564 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 565 return (FALSE); 566 } 567 client = local_rpcb(); 568 if (! client) { 569 return (FALSE); 570 } 571 572 /* convert to universal */ 573 parms.r_addr = taddr2uaddr(__UNCONST(nconf), __UNCONST(address)); 574 if (!parms.r_addr) { 575 CLNT_DESTROY(client); 576 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE; 577 return (FALSE); /* no universal address */ 578 } 579 parms.r_prog = program; 580 parms.r_vers = version; 581 parms.r_netid = nconf->nc_netid; 582 /* 583 * Though uid is not being used directly, we still send it for 584 * completeness. For non-unix platforms, perhaps some other 585 * string or an empty string can be sent. 586 */ 587 (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid()); 588 parms.r_owner = uidbuf; 589 590 CLNT_CALL(client, (rpcproc_t)RPCBPROC_SET, (xdrproc_t) xdr_rpcb, 591 (char *)(void *)&parms, (xdrproc_t) xdr_bool, 592 (char *)(void *)&rslt, tottimeout); 593 594 CLNT_DESTROY(client); 595 free(parms.r_addr); 596 return (rslt); 597 } 598 599 /* 600 * Remove the mapping between program, version and netbuf address. 601 * Calls the rpcbind service to do the un-mapping. 602 * If netbuf is NULL, unset for all the transports, otherwise unset 603 * only for the given transport. 604 */ 605 bool_t 606 rpcb_unset(program, version, nconf) 607 rpcprog_t program; 608 rpcvers_t version; 609 const struct netconfig *nconf; 610 { 611 CLIENT *client; 612 bool_t rslt = FALSE; 613 RPCB parms; 614 char uidbuf[32]; 615 616 client = local_rpcb(); 617 if (! client) { 618 return (FALSE); 619 } 620 621 parms.r_prog = program; 622 parms.r_vers = version; 623 if (nconf) 624 parms.r_netid = nconf->nc_netid; 625 else { 626 parms.r_netid = __UNCONST(&nullstring[0]); /* unsets all */ 627 } 628 parms.r_addr = __UNCONST(&nullstring[0]); 629 (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid()); 630 parms.r_owner = uidbuf; 631 632 CLNT_CALL(client, (rpcproc_t)RPCBPROC_UNSET, (xdrproc_t) xdr_rpcb, 633 (char *)(void *)&parms, (xdrproc_t) xdr_bool, 634 (char *)(void *)&rslt, tottimeout); 635 636 CLNT_DESTROY(client); 637 return (rslt); 638 } 639 640 /* 641 * From the merged list, find the appropriate entry 642 */ 643 static struct netbuf * 644 got_entry(relp, nconf) 645 rpcb_entry_list_ptr relp; 646 const struct netconfig *nconf; 647 { 648 struct netbuf *na = NULL; 649 rpcb_entry_list_ptr sp; 650 rpcb_entry *rmap; 651 652 _DIAGASSERT(nconf != NULL); 653 654 for (sp = relp; sp != NULL; sp = sp->rpcb_entry_next) { 655 rmap = &sp->rpcb_entry_map; 656 if ((strcmp(nconf->nc_proto, rmap->r_nc_proto) == 0) && 657 (strcmp(nconf->nc_protofmly, rmap->r_nc_protofmly) == 0) && 658 (nconf->nc_semantics == rmap->r_nc_semantics) && 659 (rmap->r_maddr != NULL) && (rmap->r_maddr[0] != 0)) { 660 na = uaddr2taddr(nconf, rmap->r_maddr); 661 #ifdef ND_DEBUG 662 fprintf(stderr, "\tRemote address is [%s].\n", 663 rmap->r_maddr); 664 if (!na) 665 fprintf(stderr, 666 "\tCouldn't resolve remote address!\n"); 667 #endif 668 break; 669 } 670 } 671 return (na); 672 } 673 674 /* 675 * An internal function which optimizes rpcb_getaddr function. It also 676 * returns the client handle that it uses to contact the remote rpcbind. 677 * 678 * The algorithm used: If the transports is TCP or UDP, it first tries 679 * version 2 (portmap), 4 and then 3 (svr4). This order should be 680 * changed in the next OS release to 4, 2 and 3. We are assuming that by 681 * that time, version 4 would be available on many machines on the network. 682 * With this algorithm, we get performance as well as a plan for 683 * obsoleting version 2. 684 * 685 * For all other transports, the algorithm remains as 4 and then 3. 686 * 687 * XXX: Due to some problems with t_connect(), we do not reuse the same client 688 * handle for COTS cases and hence in these cases we do not return the 689 * client handle. This code will change if t_connect() ever 690 * starts working properly. Also look under clnt_vc.c. 691 */ 692 struct netbuf * 693 __rpcb_findaddr(program, version, nconf, host, clpp) 694 rpcprog_t program; 695 rpcvers_t version; 696 const struct netconfig *nconf; 697 const char *host; 698 CLIENT **clpp; 699 { 700 CLIENT *client = NULL; 701 RPCB parms; 702 enum clnt_stat clnt_st; 703 char *ua = NULL; 704 rpcvers_t vers; 705 struct netbuf *address = NULL; 706 rpcvers_t start_vers = RPCBVERS4; 707 struct netbuf servaddr; 708 709 /* nconf is handled below */ 710 _DIAGASSERT(host != NULL); 711 /* clpp may be NULL */ 712 713 /* parameter checking */ 714 if (nconf == NULL) { 715 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 716 return (NULL); 717 } 718 719 parms.r_addr = NULL; 720 721 #ifdef PORTMAP 722 /* Try version 2 for TCP or UDP */ 723 if (strcmp(nconf->nc_protofmly, NC_INET) == 0) { 724 u_short port = 0; 725 struct netbuf remote; 726 rpcvers_t pmapvers = 2; 727 struct pmap pmapparms; 728 729 /* 730 * Try UDP only - there are some portmappers out 731 * there that use UDP only. 732 */ 733 if (strcmp(nconf->nc_proto, NC_TCP) == 0) { 734 struct netconfig *newnconf; 735 736 if ((newnconf = getnetconfigent("udp")) == NULL) { 737 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 738 return (NULL); 739 } 740 client = getclnthandle(host, newnconf, &parms.r_addr); 741 freenetconfigent(newnconf); 742 } else { 743 client = getclnthandle(host, nconf, &parms.r_addr); 744 } 745 if (client == NULL) { 746 return (NULL); 747 } 748 749 /* Set the version */ 750 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&pmapvers); 751 pmapparms.pm_prog = program; 752 pmapparms.pm_vers = version; 753 pmapparms.pm_prot = strcmp(nconf->nc_proto, NC_TCP) ? 754 IPPROTO_UDP : IPPROTO_TCP; 755 pmapparms.pm_port = 0; /* not needed */ 756 clnt_st = CLNT_CALL(client, (rpcproc_t)PMAPPROC_GETPORT, 757 (xdrproc_t) xdr_pmap, (caddr_t)(void *)&pmapparms, 758 (xdrproc_t) xdr_u_short, (caddr_t)(void *)&port, 759 tottimeout); 760 if (clnt_st != RPC_SUCCESS) { 761 if ((clnt_st == RPC_PROGVERSMISMATCH) || 762 (clnt_st == RPC_PROGUNAVAIL)) 763 goto try_rpcbind; /* Try different versions */ 764 rpc_createerr.cf_stat = RPC_PMAPFAILURE; 765 clnt_geterr(client, &rpc_createerr.cf_error); 766 goto error; 767 } else if (port == 0) { 768 address = NULL; 769 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 770 goto error; 771 } 772 port = htons(port); 773 CLNT_CONTROL(client, CLGET_SVC_ADDR, (char *)(void *)&remote); 774 if (((address = malloc(sizeof(struct netbuf))) == NULL) || 775 ((address->buf = malloc(remote.len)) == NULL)) { 776 rpc_createerr.cf_stat = RPC_SYSTEMERROR; 777 clnt_geterr(client, &rpc_createerr.cf_error); 778 if (address) { 779 free(address); 780 address = NULL; 781 } 782 goto error; 783 } 784 memcpy(address->buf, remote.buf, remote.len); 785 memcpy(&((char *)address->buf)[sizeof (short)], 786 (char *)(void *)&port, sizeof (short)); 787 address->len = address->maxlen = remote.len; 788 goto done; 789 } 790 #endif 791 792 try_rpcbind: 793 /* 794 * Now we try version 4 and then 3. 795 * We also send the remote system the address we used to 796 * contact it in case it can help to connect back with us 797 */ 798 parms.r_prog = program; 799 parms.r_vers = version; 800 parms.r_owner = __UNCONST(&nullstring[0]); /* not needed; */ 801 /* just for xdring */ 802 parms.r_netid = nconf->nc_netid; /* not really needed */ 803 804 /* 805 * If a COTS transport is being used, try getting address via CLTS 806 * transport. This works only with version 4. 807 * NOTE: This is being done for all transports EXCEPT LOOPBACK 808 * because with loopback the cost to go to a COTS is same as 809 * the cost to go through CLTS, plus you get the advantage of 810 * finding out immediately if the local rpcbind process is dead. 811 */ 812 #if 1 813 if ((nconf->nc_semantics == NC_TPI_COTS_ORD || 814 nconf->nc_semantics == NC_TPI_COTS) && 815 (strcmp(nconf->nc_protofmly, NC_LOOPBACK) != 0)) 816 #else 817 if (client != NULL) { 818 CLNT_DESTROY(client); 819 client = NULL; 820 } 821 if (nconf->nc_semantics == NC_TPI_CLTS) 822 #endif 823 { 824 void *handle; 825 struct netconfig *nconf_clts; 826 rpcb_entry_list_ptr relp = NULL; 827 828 if (client == NULL) { 829 /* This did not go through the above PORTMAP/TCP code */ 830 #if 1 831 if ((handle = __rpc_setconf("datagram_v")) != NULL) 832 #else 833 if ((handle = __rpc_setconf("circuit_v")) != NULL) 834 #endif 835 { 836 while ((nconf_clts = __rpc_getconf(handle)) 837 != NULL) { 838 if (strcmp(nconf_clts->nc_protofmly, 839 nconf->nc_protofmly) != 0) { 840 continue; 841 } 842 client = getclnthandle(host, nconf_clts, 843 &parms.r_addr); 844 break; 845 } 846 __rpc_endconf(handle); 847 } 848 if (client == NULL) 849 goto regular_rpcbind; /* Go the regular way */ 850 } else { 851 /* This is a UDP PORTMAP handle. Change to version 4 */ 852 vers = RPCBVERS4; 853 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 854 } 855 /* 856 * We also send the remote system the address we used to 857 * contact it in case it can help it connect back with us 858 */ 859 if (parms.r_addr == NULL) { 860 /* for XDRing */ 861 parms.r_addr = __UNCONST(&nullstring[0]); 862 } 863 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDRLIST, 864 (xdrproc_t) xdr_rpcb, (char *)(void *)&parms, 865 (xdrproc_t) xdr_rpcb_entry_list_ptr, 866 (char *)(void *)&relp, tottimeout); 867 if (clnt_st == RPC_SUCCESS) { 868 if ((address = got_entry(relp, nconf)) != NULL) { 869 xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr, 870 (char *)(void *)&relp); 871 CLNT_CONTROL(client, CLGET_SVC_ADDR, 872 (char *)(void *)&servaddr); 873 __rpc_fixup_addr(address, &servaddr); 874 goto done; 875 } 876 /* Entry not found for this transport */ 877 xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr, 878 (char *)(void *)&relp); 879 /* 880 * XXX: should have perhaps returned with error but 881 * since the remote machine might not always be able 882 * to send the address on all transports, we try the 883 * regular way with regular_rpcbind 884 */ 885 goto regular_rpcbind; 886 } else if ((clnt_st == RPC_PROGVERSMISMATCH) || 887 (clnt_st == RPC_PROGUNAVAIL)) { 888 start_vers = RPCBVERS; /* Try version 3 now */ 889 goto regular_rpcbind; /* Try different versions */ 890 } else { 891 rpc_createerr.cf_stat = RPC_PMAPFAILURE; 892 clnt_geterr(client, &rpc_createerr.cf_error); 893 goto error; 894 } 895 } 896 897 regular_rpcbind: 898 899 /* Now the same transport is to be used to get the address */ 900 #if 1 901 if (client && ((nconf->nc_semantics == NC_TPI_COTS_ORD) || 902 (nconf->nc_semantics == NC_TPI_COTS))) 903 #else 904 if (client && nconf->nc_semantics == NC_TPI_CLTS) 905 #endif 906 { 907 /* A CLTS type of client - destroy it */ 908 CLNT_DESTROY(client); 909 client = NULL; 910 } 911 912 if (client == NULL) { 913 client = getclnthandle(host, nconf, &parms.r_addr); 914 if (client == NULL) { 915 goto error; 916 } 917 } 918 if (parms.r_addr == NULL) 919 parms.r_addr = __UNCONST(&nullstring[0]); 920 921 /* First try from start_vers and then version 3 (RPCBVERS) */ 922 for (vers = start_vers; vers >= RPCBVERS; vers--) { 923 /* Set the version */ 924 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 925 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDR, 926 (xdrproc_t) xdr_rpcb, (char *)(void *)&parms, 927 (xdrproc_t) xdr_wrapstring, (char *)(void *) &ua, 928 tottimeout); 929 if (clnt_st == RPC_SUCCESS) { 930 if ((ua == NULL) || (ua[0] == 0)) { 931 /* address unknown */ 932 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 933 goto error; 934 } 935 address = uaddr2taddr(nconf, ua); 936 #ifdef ND_DEBUG 937 fprintf(stderr, "\tRemote address is [%s]\n", ua); 938 if (!address) 939 fprintf(stderr, 940 "\tCouldn't resolve remote address!\n"); 941 #endif 942 xdr_free((xdrproc_t)xdr_wrapstring, 943 (char *)(void *)&ua); 944 945 if (! address) { 946 /* We don't know about your universal address */ 947 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE; 948 goto error; 949 } 950 CLNT_CONTROL(client, CLGET_SVC_ADDR, 951 (char *)(void *)&servaddr); 952 __rpc_fixup_addr(address, &servaddr); 953 goto done; 954 } else if (clnt_st == RPC_PROGVERSMISMATCH) { 955 struct rpc_err rpcerr; 956 957 clnt_geterr(client, &rpcerr); 958 if (rpcerr.re_vers.low > RPCBVERS4) 959 goto error; /* a new version, can't handle */ 960 } else if (clnt_st != RPC_PROGUNAVAIL) { 961 /* Cant handle this error */ 962 rpc_createerr.cf_stat = clnt_st; 963 clnt_geterr(client, &rpc_createerr.cf_error); 964 goto error; 965 } 966 } 967 968 error: 969 if (client) { 970 CLNT_DESTROY(client); 971 client = NULL; 972 } 973 done: 974 if (nconf->nc_semantics != NC_TPI_CLTS) { 975 /* This client is the connectionless one */ 976 if (client) { 977 CLNT_DESTROY(client); 978 client = NULL; 979 } 980 } 981 if (clpp) { 982 *clpp = client; 983 } else if (client) { 984 CLNT_DESTROY(client); 985 } 986 return (address); 987 } 988 989 990 /* 991 * Find the mapped address for program, version. 992 * Calls the rpcbind service remotely to do the lookup. 993 * Uses the transport specified in nconf. 994 * Returns FALSE (0) if no map exists, else returns 1. 995 * 996 * Assuming that the address is all properly allocated 997 */ 998 int 999 rpcb_getaddr(program, version, nconf, address, host) 1000 rpcprog_t program; 1001 rpcvers_t version; 1002 const struct netconfig *nconf; 1003 struct netbuf *address; 1004 const char *host; 1005 { 1006 struct netbuf *na; 1007 1008 _DIAGASSERT(address != NULL); 1009 1010 if ((na = __rpcb_findaddr(program, version, nconf, 1011 host, NULL)) == NULL) 1012 return (FALSE); 1013 1014 if (na->len > address->maxlen) { 1015 /* Too long address */ 1016 free(na->buf); 1017 free(na); 1018 rpc_createerr.cf_stat = RPC_FAILED; 1019 return (FALSE); 1020 } 1021 memcpy(address->buf, na->buf, (size_t)na->len); 1022 address->len = na->len; 1023 free(na->buf); 1024 free(na); 1025 return (TRUE); 1026 } 1027 1028 /* 1029 * Get a copy of the current maps. 1030 * Calls the rpcbind service remotely to get the maps. 1031 * 1032 * It returns only a list of the services 1033 * It returns NULL on failure. 1034 */ 1035 rpcblist * 1036 rpcb_getmaps(nconf, host) 1037 const struct netconfig *nconf; 1038 const char *host; 1039 { 1040 rpcblist_ptr head = NULL; 1041 CLIENT *client; 1042 enum clnt_stat clnt_st; 1043 rpcvers_t vers = 0; 1044 1045 client = getclnthandle(host, nconf, NULL); 1046 if (client == NULL) { 1047 return (head); 1048 } 1049 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP, 1050 (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr, 1051 (char *)(void *)&head, tottimeout); 1052 if (clnt_st == RPC_SUCCESS) 1053 goto done; 1054 1055 if ((clnt_st != RPC_PROGVERSMISMATCH) && 1056 (clnt_st != RPC_PROGUNAVAIL)) { 1057 rpc_createerr.cf_stat = RPC_RPCBFAILURE; 1058 clnt_geterr(client, &rpc_createerr.cf_error); 1059 goto done; 1060 } 1061 1062 /* fall back to earlier version */ 1063 CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers); 1064 if (vers == RPCBVERS4) { 1065 vers = RPCBVERS; 1066 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 1067 if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP, 1068 (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr, 1069 (char *)(void *)&head, tottimeout) == RPC_SUCCESS) 1070 goto done; 1071 } 1072 rpc_createerr.cf_stat = RPC_RPCBFAILURE; 1073 clnt_geterr(client, &rpc_createerr.cf_error); 1074 1075 done: 1076 CLNT_DESTROY(client); 1077 return (head); 1078 } 1079 1080 /* 1081 * rpcbinder remote-call-service interface. 1082 * This routine is used to call the rpcbind remote call service 1083 * which will look up a service program in the address maps, and then 1084 * remotely call that routine with the given parameters. This allows 1085 * programs to do a lookup and call in one step. 1086 */ 1087 enum clnt_stat 1088 rpcb_rmtcall(nconf, host, prog, vers, proc, xdrargs, argsp, 1089 xdrres, resp, tout, addr_ptr) 1090 const struct netconfig *nconf; /* Netconfig structure */ 1091 const char *host; /* Remote host name */ 1092 rpcprog_t prog; 1093 rpcvers_t vers; 1094 rpcproc_t proc; /* Remote proc identifiers */ 1095 xdrproc_t xdrargs, xdrres; /* XDR routines */ 1096 const char *argsp; /* Argument */ 1097 caddr_t resp; /* Result */ 1098 struct timeval tout; /* Timeout value for this call */ 1099 const struct netbuf *addr_ptr; /* Preallocated netbuf address */ 1100 { 1101 CLIENT *client; 1102 enum clnt_stat stat; 1103 struct r_rpcb_rmtcallargs a; 1104 struct r_rpcb_rmtcallres r; 1105 rpcvers_t rpcb_vers; 1106 1107 stat = RPC_FAILED; /* XXXGCC -Wuninitialized [dreamcast] */ 1108 1109 client = getclnthandle(host, nconf, NULL); 1110 if (client == NULL) { 1111 return (RPC_FAILED); 1112 } 1113 CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, __UNCONST(&rmttimeout)); 1114 a.prog = prog; 1115 a.vers = vers; 1116 a.proc = proc; 1117 a.args.args_val = argsp; 1118 a.xdr_args = xdrargs; 1119 r.addr = NULL; 1120 r.results.results_val = resp; 1121 r.xdr_res = xdrres; 1122 1123 for (rpcb_vers = RPCBVERS4; rpcb_vers >= RPCBVERS; rpcb_vers--) { 1124 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&rpcb_vers); 1125 stat = CLNT_CALL(client, (rpcproc_t)RPCBPROC_CALLIT, 1126 (xdrproc_t) xdr_rpcb_rmtcallargs, (char *)(void *)&a, 1127 (xdrproc_t) xdr_rpcb_rmtcallres, (char *)(void *)&r, tout); 1128 if ((stat == RPC_SUCCESS) && (addr_ptr != NULL)) { 1129 struct netbuf *na; 1130 na = uaddr2taddr(__UNCONST(nconf), r.addr); 1131 if (!na) { 1132 stat = RPC_N2AXLATEFAILURE; 1133 ((struct netbuf *)__UNCONST(addr_ptr))->len = 0; 1134 goto error; 1135 } 1136 if (na->len > addr_ptr->maxlen) { 1137 /* Too long address */ 1138 stat = RPC_FAILED; /* XXX A better error no */ 1139 free(na->buf); 1140 free(na); 1141 ((struct netbuf *)__UNCONST(addr_ptr))->len = 0; 1142 goto error; 1143 } 1144 memcpy(addr_ptr->buf, na->buf, (size_t)na->len); 1145 ((struct netbuf *)__UNCONST(addr_ptr))->len = na->len; 1146 free(na->buf); 1147 free(na); 1148 break; 1149 } else if ((stat != RPC_PROGVERSMISMATCH) && 1150 (stat != RPC_PROGUNAVAIL)) { 1151 goto error; 1152 } 1153 } 1154 error: 1155 CLNT_DESTROY(client); 1156 if (r.addr) 1157 xdr_free((xdrproc_t) xdr_wrapstring, (char *)(void *)&r.addr); 1158 return (stat); 1159 } 1160 1161 /* 1162 * Gets the time on the remote host. 1163 * Returns 1 if succeeds else 0. 1164 */ 1165 bool_t 1166 rpcb_gettime(host, timep) 1167 const char *host; 1168 time_t *timep; 1169 { 1170 CLIENT *client = NULL; 1171 void *handle; 1172 struct netconfig *nconf; 1173 rpcvers_t vers; 1174 enum clnt_stat st; 1175 1176 1177 if ((host == NULL) || (host[0] == 0)) { 1178 time(timep); 1179 return (TRUE); 1180 } 1181 1182 if ((handle = __rpc_setconf("netpath")) == NULL) { 1183 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1184 return (FALSE); 1185 } 1186 rpc_createerr.cf_stat = RPC_SUCCESS; 1187 while (client == NULL) { 1188 if ((nconf = __rpc_getconf(handle)) == NULL) { 1189 if (rpc_createerr.cf_stat == RPC_SUCCESS) 1190 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1191 break; 1192 } 1193 client = getclnthandle(host, nconf, NULL); 1194 if (client) 1195 break; 1196 } 1197 __rpc_endconf(handle); 1198 if (client == NULL) { 1199 return (FALSE); 1200 } 1201 1202 st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME, 1203 (xdrproc_t) xdr_void, NULL, 1204 (xdrproc_t) xdr_int, (char *)(void *)timep, tottimeout); 1205 1206 if ((st == RPC_PROGVERSMISMATCH) || (st == RPC_PROGUNAVAIL)) { 1207 CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers); 1208 if (vers == RPCBVERS4) { 1209 /* fall back to earlier version */ 1210 vers = RPCBVERS; 1211 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 1212 st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME, 1213 (xdrproc_t) xdr_void, NULL, 1214 (xdrproc_t) xdr_int, (char *)(void *)timep, 1215 tottimeout); 1216 } 1217 } 1218 CLNT_DESTROY(client); 1219 return (st == RPC_SUCCESS? TRUE: FALSE); 1220 } 1221 1222 /* 1223 * Converts taddr to universal address. This routine should never 1224 * really be called because local n2a libraries are always provided. 1225 */ 1226 char * 1227 rpcb_taddr2uaddr(nconf, taddr) 1228 struct netconfig *nconf; 1229 struct netbuf *taddr; 1230 { 1231 CLIENT *client; 1232 char *uaddr = NULL; 1233 1234 1235 /* parameter checking */ 1236 if (nconf == NULL) { 1237 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1238 return (NULL); 1239 } 1240 if (taddr == NULL) { 1241 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 1242 return (NULL); 1243 } 1244 client = local_rpcb(); 1245 if (! client) { 1246 return (NULL); 1247 } 1248 1249 CLNT_CALL(client, (rpcproc_t)RPCBPROC_TADDR2UADDR, 1250 (xdrproc_t) xdr_netbuf, (char *)(void *)taddr, 1251 (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr, tottimeout); 1252 CLNT_DESTROY(client); 1253 return (uaddr); 1254 } 1255 1256 /* 1257 * Converts universal address to netbuf. This routine should never 1258 * really be called because local n2a libraries are always provided. 1259 */ 1260 struct netbuf * 1261 rpcb_uaddr2taddr(nconf, uaddr) 1262 struct netconfig *nconf; 1263 char *uaddr; 1264 { 1265 CLIENT *client; 1266 struct netbuf *taddr; 1267 1268 1269 /* parameter checking */ 1270 if (nconf == NULL) { 1271 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1272 return (NULL); 1273 } 1274 if (uaddr == NULL) { 1275 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 1276 return (NULL); 1277 } 1278 client = local_rpcb(); 1279 if (! client) { 1280 return (NULL); 1281 } 1282 1283 taddr = (struct netbuf *)calloc(1, sizeof (struct netbuf)); 1284 if (taddr == NULL) { 1285 CLNT_DESTROY(client); 1286 return (NULL); 1287 } 1288 if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_UADDR2TADDR, 1289 (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr, 1290 (xdrproc_t) xdr_netbuf, (char *)(void *)taddr, 1291 tottimeout) != RPC_SUCCESS) { 1292 free(taddr); 1293 taddr = NULL; 1294 } 1295 CLNT_DESTROY(client); 1296 return (taddr); 1297 } 1298