1 /* $NetBSD: rpcb_clnt.c,v 1.19 2005/12/03 15:16:19 yamt 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 1.19 2005/12/03 15:16:19 yamt 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 ((struct address_cache *) 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 = (struct address_cache *) 242 malloc(sizeof (struct address_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 = (struct netbuf *)malloc(sizeof (struct netbuf)); 250 if (!ad_cache->ac_host || !ad_cache->ac_netid || !ad_cache->ac_taddr || 251 (uaddr && !ad_cache->ac_uaddr)) { 252 return; 253 } 254 ad_cache->ac_taddr->len = ad_cache->ac_taddr->maxlen = taddr->len; 255 ad_cache->ac_taddr->buf = (char *) malloc(taddr->len); 256 if (ad_cache->ac_taddr->buf == NULL) { 257 return; 258 } 259 memcpy(ad_cache->ac_taddr->buf, taddr->buf, taddr->len); 260 #ifdef ND_DEBUG 261 fprintf(stderr, "Added to cache: %s : %s\n", host, netid); 262 #endif 263 264 /* VARIABLES PROTECTED BY rpcbaddr_cache_lock: cptr */ 265 266 rwlock_wrlock(&rpcbaddr_cache_lock); 267 if (cachesize < CACHESIZE) { 268 ad_cache->ac_next = front; 269 front = ad_cache; 270 cachesize++; 271 } else { 272 /* Free the last entry */ 273 cptr = front; 274 prevptr = NULL; 275 while (cptr->ac_next) { 276 prevptr = cptr; 277 cptr = cptr->ac_next; 278 } 279 280 #ifdef ND_DEBUG 281 fprintf(stderr, "Deleted from cache: %s : %s\n", 282 cptr->ac_host, cptr->ac_netid); 283 #endif 284 free(cptr->ac_host); 285 free(cptr->ac_netid); 286 free(cptr->ac_taddr->buf); 287 free(cptr->ac_taddr); 288 if (cptr->ac_uaddr) 289 free(cptr->ac_uaddr); 290 291 if (prevptr) { 292 prevptr->ac_next = NULL; 293 ad_cache->ac_next = front; 294 front = ad_cache; 295 } else { 296 front = ad_cache; 297 ad_cache->ac_next = NULL; 298 } 299 free(cptr); 300 } 301 rwlock_unlock(&rpcbaddr_cache_lock); 302 } 303 304 /* 305 * This routine will return a client handle that is connected to the 306 * rpcbind. Returns NULL on error and free's everything. 307 */ 308 static CLIENT * 309 getclnthandle(host, nconf, targaddr) 310 const char *host; 311 const struct netconfig *nconf; 312 char **targaddr; 313 { 314 CLIENT *client; 315 struct netbuf *addr, taddr; 316 struct netbuf addr_to_delete; 317 struct __rpc_sockinfo si; 318 struct addrinfo hints, *res, *tres; 319 struct address_cache *ad_cache; 320 char *tmpaddr; 321 322 _DIAGASSERT(host != NULL); 323 _DIAGASSERT(nconf != NULL); 324 /* targaddr may be NULL */ 325 326 /* VARIABLES PROTECTED BY rpcbaddr_cache_lock: ad_cache */ 327 328 /* Get the address of the rpcbind. Check cache first */ 329 client = NULL; 330 addr_to_delete.len = 0; 331 rwlock_rdlock(&rpcbaddr_cache_lock); 332 ad_cache = check_cache(host, nconf->nc_netid); 333 if (ad_cache != NULL) { 334 addr = ad_cache->ac_taddr; 335 client = clnt_tli_create(RPC_ANYFD, nconf, addr, 336 (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0); 337 if (client != NULL) { 338 if (targaddr) 339 *targaddr = ad_cache->ac_uaddr; 340 rwlock_unlock(&rpcbaddr_cache_lock); 341 return (client); 342 } 343 addr_to_delete.len = addr->len; 344 addr_to_delete.buf = (char *)malloc(addr->len); 345 if (addr_to_delete.buf == NULL) { 346 addr_to_delete.len = 0; 347 } else { 348 memcpy(addr_to_delete.buf, addr->buf, addr->len); 349 } 350 } 351 rwlock_unlock(&rpcbaddr_cache_lock); 352 if (addr_to_delete.len != 0) { 353 /* 354 * Assume this may be due to cache data being 355 * outdated 356 */ 357 rwlock_wrlock(&rpcbaddr_cache_lock); 358 delete_cache(&addr_to_delete); 359 rwlock_unlock(&rpcbaddr_cache_lock); 360 free(addr_to_delete.buf); 361 } 362 if (!__rpc_nconf2sockinfo(nconf, &si)) { 363 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 364 return NULL; 365 } 366 367 memset(&hints, 0, sizeof hints); 368 hints.ai_family = si.si_af; 369 hints.ai_socktype = si.si_socktype; 370 hints.ai_protocol = si.si_proto; 371 372 #ifdef CLNT_DEBUG 373 printf("trying netid %s family %d proto %d socktype %d\n", 374 nconf->nc_netid, si.si_af, si.si_proto, si.si_socktype); 375 #endif 376 377 if (getaddrinfo(host, "sunrpc", &hints, &res) != 0) { 378 rpc_createerr.cf_stat = RPC_UNKNOWNHOST; 379 return NULL; 380 } 381 382 for (tres = res; tres != NULL; tres = tres->ai_next) { 383 taddr.buf = tres->ai_addr; 384 taddr.len = taddr.maxlen = tres->ai_addrlen; 385 386 #ifdef ND_DEBUG 387 { 388 char *ua; 389 390 ua = taddr2uaddr(nconf, &taddr); 391 fprintf(stderr, "Got it [%s]\n", ua); 392 free(ua); 393 } 394 #endif 395 396 #ifdef ND_DEBUG 397 { 398 int i; 399 400 fprintf(stderr, "\tnetbuf len = %d, maxlen = %d\n", 401 taddr.len, taddr.maxlen); 402 fprintf(stderr, "\tAddress is "); 403 for (i = 0; i < taddr.len; i++) 404 fprintf(stderr, "%u.", ((char *)(taddr.buf))[i]); 405 fprintf(stderr, "\n"); 406 } 407 #endif 408 client = clnt_tli_create(RPC_ANYFD, nconf, &taddr, 409 (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0); 410 #ifdef ND_DEBUG 411 if (! client) { 412 clnt_pcreateerror("rpcbind clnt interface"); 413 } 414 #endif 415 416 if (client) { 417 tmpaddr = targaddr ? taddr2uaddr(nconf, &taddr) : NULL; 418 add_cache(host, nconf->nc_netid, &taddr, tmpaddr); 419 if (targaddr) 420 *targaddr = tmpaddr; 421 break; 422 } 423 } 424 freeaddrinfo(res); 425 return (client); 426 } 427 428 /* XXX */ 429 #define IN4_LOCALHOST_STRING "127.0.0.1" 430 #define IN6_LOCALHOST_STRING "::1" 431 432 /* 433 * This routine will return a client handle that is connected to the local 434 * rpcbind. Returns NULL on error and free's everything. 435 */ 436 static CLIENT * 437 local_rpcb() 438 { 439 CLIENT *client; 440 static struct netconfig *loopnconf; 441 static const char *hostname; 442 #ifdef _REENTRANT 443 extern mutex_t loopnconf_lock; 444 #endif 445 int sock; 446 size_t tsize; 447 struct netbuf nbuf; 448 struct sockaddr_un sun; 449 450 /* 451 * Try connecting to the local rpcbind through a local socket 452 * first. If this doesn't work, try all transports defined in 453 * the netconfig file. 454 */ 455 memset(&sun, 0, sizeof sun); 456 sock = socket(AF_LOCAL, SOCK_STREAM, 0); 457 if (sock < 0) 458 goto try_nconf; 459 sun.sun_family = AF_LOCAL; 460 strcpy(sun.sun_path, _PATH_RPCBINDSOCK); 461 nbuf.len = sun.sun_len = SUN_LEN(&sun); 462 nbuf.maxlen = sizeof (struct sockaddr_un); 463 nbuf.buf = &sun; 464 465 tsize = __rpc_get_t_size(AF_LOCAL, 0, 0); 466 client = clnt_vc_create(sock, &nbuf, (rpcprog_t)RPCBPROG, 467 (rpcvers_t)RPCBVERS, tsize, tsize); 468 469 if (client != NULL) { 470 /* XXX - mark the socket to be closed in destructor */ 471 (void) CLNT_CONTROL(client, CLSET_FD_CLOSE, NULL); 472 return client; 473 } 474 475 /* XXX - nobody needs this socket anymore, free the descriptor */ 476 close(sock); 477 478 try_nconf: 479 480 /* VARIABLES PROTECTED BY loopnconf_lock: loopnconf */ 481 mutex_lock(&loopnconf_lock); 482 if (loopnconf == NULL) { 483 struct netconfig *nconf, *tmpnconf = NULL; 484 void *nc_handle; 485 int fd; 486 487 nc_handle = setnetconfig(); 488 if (nc_handle == NULL) { 489 /* fails to open netconfig file */ 490 syslog (LOG_ERR, "rpc: failed to open " NETCONFIG); 491 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 492 mutex_unlock(&loopnconf_lock); 493 return (NULL); 494 } 495 while ((nconf = getnetconfig(nc_handle)) != NULL) { 496 #ifdef INET6 497 if ((strcmp(nconf->nc_protofmly, NC_INET6) == 0 || 498 #else 499 if (( 500 #endif 501 strcmp(nconf->nc_protofmly, NC_INET) == 0) && 502 (nconf->nc_semantics == NC_TPI_COTS || 503 nconf->nc_semantics == NC_TPI_COTS_ORD)) { 504 fd = __rpc_nconf2fd(nconf); 505 /* 506 * Can't create a socket, assume that 507 * this family isn't configured in the kernel. 508 */ 509 if (fd < 0) 510 continue; 511 close(fd); 512 tmpnconf = nconf; 513 if (!strcmp(nconf->nc_protofmly, NC_INET)) 514 hostname = IN4_LOCALHOST_STRING; 515 else 516 hostname = IN6_LOCALHOST_STRING; 517 } 518 } 519 if (tmpnconf == NULL) { 520 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 521 mutex_unlock(&loopnconf_lock); 522 return (NULL); 523 } 524 loopnconf = getnetconfigent(tmpnconf->nc_netid); 525 /* loopnconf is never freed */ 526 endnetconfig(nc_handle); 527 } 528 mutex_unlock(&loopnconf_lock); 529 client = getclnthandle(hostname, loopnconf, NULL); 530 return (client); 531 } 532 533 /* 534 * Set a mapping between program, version and address. 535 * Calls the rpcbind service to do the mapping. 536 */ 537 bool_t 538 rpcb_set(program, version, nconf, address) 539 rpcprog_t program; 540 rpcvers_t version; 541 const struct netconfig *nconf; /* Network structure of transport */ 542 const struct netbuf *address; /* Services netconfig address */ 543 { 544 CLIENT *client; 545 bool_t rslt = FALSE; 546 RPCB parms; 547 char uidbuf[32]; 548 549 /* parameter checking */ 550 if (nconf == NULL) { 551 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 552 return (FALSE); 553 } 554 if (address == NULL) { 555 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 556 return (FALSE); 557 } 558 client = local_rpcb(); 559 if (! client) { 560 return (FALSE); 561 } 562 563 /* convert to universal */ 564 parms.r_addr = taddr2uaddr(__UNCONST(nconf), __UNCONST(address)); 565 if (!parms.r_addr) { 566 CLNT_DESTROY(client); 567 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE; 568 return (FALSE); /* no universal address */ 569 } 570 parms.r_prog = program; 571 parms.r_vers = version; 572 parms.r_netid = nconf->nc_netid; 573 /* 574 * Though uid is not being used directly, we still send it for 575 * completeness. For non-unix platforms, perhaps some other 576 * string or an empty string can be sent. 577 */ 578 (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid()); 579 parms.r_owner = uidbuf; 580 581 CLNT_CALL(client, (rpcproc_t)RPCBPROC_SET, (xdrproc_t) xdr_rpcb, 582 (char *)(void *)&parms, (xdrproc_t) xdr_bool, 583 (char *)(void *)&rslt, tottimeout); 584 585 CLNT_DESTROY(client); 586 free(parms.r_addr); 587 return (rslt); 588 } 589 590 /* 591 * Remove the mapping between program, version and netbuf address. 592 * Calls the rpcbind service to do the un-mapping. 593 * If netbuf is NULL, unset for all the transports, otherwise unset 594 * only for the given transport. 595 */ 596 bool_t 597 rpcb_unset(program, version, nconf) 598 rpcprog_t program; 599 rpcvers_t version; 600 const struct netconfig *nconf; 601 { 602 CLIENT *client; 603 bool_t rslt = FALSE; 604 RPCB parms; 605 char uidbuf[32]; 606 607 client = local_rpcb(); 608 if (! client) { 609 return (FALSE); 610 } 611 612 parms.r_prog = program; 613 parms.r_vers = version; 614 if (nconf) 615 parms.r_netid = nconf->nc_netid; 616 else { 617 parms.r_netid = __UNCONST(&nullstring[0]); /* unsets all */ 618 } 619 parms.r_addr = __UNCONST(&nullstring[0]); 620 (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid()); 621 parms.r_owner = uidbuf; 622 623 CLNT_CALL(client, (rpcproc_t)RPCBPROC_UNSET, (xdrproc_t) xdr_rpcb, 624 (char *)(void *)&parms, (xdrproc_t) xdr_bool, 625 (char *)(void *)&rslt, tottimeout); 626 627 CLNT_DESTROY(client); 628 return (rslt); 629 } 630 631 /* 632 * From the merged list, find the appropriate entry 633 */ 634 static struct netbuf * 635 got_entry(relp, nconf) 636 rpcb_entry_list_ptr relp; 637 const struct netconfig *nconf; 638 { 639 struct netbuf *na = NULL; 640 rpcb_entry_list_ptr sp; 641 rpcb_entry *rmap; 642 643 _DIAGASSERT(nconf != NULL); 644 645 for (sp = relp; sp != NULL; sp = sp->rpcb_entry_next) { 646 rmap = &sp->rpcb_entry_map; 647 if ((strcmp(nconf->nc_proto, rmap->r_nc_proto) == 0) && 648 (strcmp(nconf->nc_protofmly, rmap->r_nc_protofmly) == 0) && 649 (nconf->nc_semantics == rmap->r_nc_semantics) && 650 (rmap->r_maddr != NULL) && (rmap->r_maddr[0] != 0)) { 651 na = uaddr2taddr(nconf, rmap->r_maddr); 652 #ifdef ND_DEBUG 653 fprintf(stderr, "\tRemote address is [%s].\n", 654 rmap->r_maddr); 655 if (!na) 656 fprintf(stderr, 657 "\tCouldn't resolve remote address!\n"); 658 #endif 659 break; 660 } 661 } 662 return (na); 663 } 664 665 /* 666 * An internal function which optimizes rpcb_getaddr function. It also 667 * returns the client handle that it uses to contact the remote rpcbind. 668 * 669 * The algorithm used: If the transports is TCP or UDP, it first tries 670 * version 2 (portmap), 4 and then 3 (svr4). This order should be 671 * changed in the next OS release to 4, 2 and 3. We are assuming that by 672 * that time, version 4 would be available on many machines on the network. 673 * With this algorithm, we get performance as well as a plan for 674 * obsoleting version 2. 675 * 676 * For all other transports, the algorithm remains as 4 and then 3. 677 * 678 * XXX: Due to some problems with t_connect(), we do not reuse the same client 679 * handle for COTS cases and hence in these cases we do not return the 680 * client handle. This code will change if t_connect() ever 681 * starts working properly. Also look under clnt_vc.c. 682 */ 683 struct netbuf * 684 __rpcb_findaddr(program, version, nconf, host, clpp) 685 rpcprog_t program; 686 rpcvers_t version; 687 const struct netconfig *nconf; 688 const char *host; 689 CLIENT **clpp; 690 { 691 CLIENT *client = NULL; 692 RPCB parms; 693 enum clnt_stat clnt_st; 694 char *ua = NULL; 695 rpcvers_t vers; 696 struct netbuf *address = NULL; 697 rpcvers_t start_vers = RPCBVERS4; 698 struct netbuf servaddr; 699 700 /* nconf is handled below */ 701 _DIAGASSERT(host != NULL); 702 /* clpp may be NULL */ 703 704 /* parameter checking */ 705 if (nconf == NULL) { 706 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 707 return (NULL); 708 } 709 710 parms.r_addr = NULL; 711 712 #ifdef PORTMAP 713 /* Try version 2 for TCP or UDP */ 714 if (strcmp(nconf->nc_protofmly, NC_INET) == 0) { 715 u_short port = 0; 716 struct netbuf remote; 717 rpcvers_t pmapvers = 2; 718 struct pmap pmapparms; 719 720 /* 721 * Try UDP only - there are some portmappers out 722 * there that use UDP only. 723 */ 724 if (strcmp(nconf->nc_proto, NC_TCP) == 0) { 725 struct netconfig *newnconf; 726 727 if ((newnconf = getnetconfigent("udp")) == NULL) { 728 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 729 return (NULL); 730 } 731 client = getclnthandle(host, newnconf, &parms.r_addr); 732 freenetconfigent(newnconf); 733 } else { 734 client = getclnthandle(host, nconf, &parms.r_addr); 735 } 736 if (client == NULL) { 737 return (NULL); 738 } 739 740 /* Set the version */ 741 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&pmapvers); 742 pmapparms.pm_prog = program; 743 pmapparms.pm_vers = version; 744 pmapparms.pm_prot = strcmp(nconf->nc_proto, NC_TCP) ? 745 IPPROTO_UDP : IPPROTO_TCP; 746 pmapparms.pm_port = 0; /* not needed */ 747 clnt_st = CLNT_CALL(client, (rpcproc_t)PMAPPROC_GETPORT, 748 (xdrproc_t) xdr_pmap, (caddr_t)(void *)&pmapparms, 749 (xdrproc_t) xdr_u_short, (caddr_t)(void *)&port, 750 tottimeout); 751 if (clnt_st != RPC_SUCCESS) { 752 if ((clnt_st == RPC_PROGVERSMISMATCH) || 753 (clnt_st == RPC_PROGUNAVAIL)) 754 goto try_rpcbind; /* Try different versions */ 755 rpc_createerr.cf_stat = RPC_PMAPFAILURE; 756 clnt_geterr(client, &rpc_createerr.cf_error); 757 goto error; 758 } else if (port == 0) { 759 address = NULL; 760 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 761 goto error; 762 } 763 port = htons(port); 764 CLNT_CONTROL(client, CLGET_SVC_ADDR, (char *)(void *)&remote); 765 if (((address = (struct netbuf *) 766 malloc(sizeof (struct netbuf))) == NULL) || 767 ((address->buf = (char *) 768 malloc(remote.len)) == NULL)) { 769 rpc_createerr.cf_stat = RPC_SYSTEMERROR; 770 clnt_geterr(client, &rpc_createerr.cf_error); 771 if (address) { 772 free(address); 773 address = NULL; 774 } 775 goto error; 776 } 777 memcpy(address->buf, remote.buf, remote.len); 778 memcpy(&((char *)address->buf)[sizeof (short)], 779 (char *)(void *)&port, sizeof (short)); 780 address->len = address->maxlen = remote.len; 781 goto done; 782 } 783 #endif 784 785 try_rpcbind: 786 /* 787 * Now we try version 4 and then 3. 788 * We also send the remote system the address we used to 789 * contact it in case it can help to connect back with us 790 */ 791 parms.r_prog = program; 792 parms.r_vers = version; 793 parms.r_owner = __UNCONST(&nullstring[0]); /* not needed; */ 794 /* just for xdring */ 795 parms.r_netid = nconf->nc_netid; /* not really needed */ 796 797 /* 798 * If a COTS transport is being used, try getting address via CLTS 799 * transport. This works only with version 4. 800 * NOTE: This is being done for all transports EXCEPT LOOPBACK 801 * because with loopback the cost to go to a COTS is same as 802 * the cost to go through CLTS, plus you get the advantage of 803 * finding out immediately if the local rpcbind process is dead. 804 */ 805 #if 1 806 if ((nconf->nc_semantics == NC_TPI_COTS_ORD || 807 nconf->nc_semantics == NC_TPI_COTS) && 808 (strcmp(nconf->nc_protofmly, NC_LOOPBACK) != 0)) 809 #else 810 if (client != NULL) { 811 CLNT_DESTROY(client); 812 client = NULL; 813 } 814 if (nconf->nc_semantics == NC_TPI_CLTS) 815 #endif 816 { 817 void *handle; 818 struct netconfig *nconf_clts; 819 rpcb_entry_list_ptr relp = NULL; 820 821 if (client == NULL) { 822 /* This did not go through the above PORTMAP/TCP code */ 823 #if 1 824 if ((handle = __rpc_setconf("datagram_v")) != NULL) 825 #else 826 if ((handle = __rpc_setconf("circuit_v")) != NULL) 827 #endif 828 { 829 while ((nconf_clts = __rpc_getconf(handle)) 830 != NULL) { 831 if (strcmp(nconf_clts->nc_protofmly, 832 nconf->nc_protofmly) != 0) { 833 continue; 834 } 835 client = getclnthandle(host, nconf_clts, 836 &parms.r_addr); 837 break; 838 } 839 __rpc_endconf(handle); 840 } 841 if (client == NULL) 842 goto regular_rpcbind; /* Go the regular way */ 843 } else { 844 /* This is a UDP PORTMAP handle. Change to version 4 */ 845 vers = RPCBVERS4; 846 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 847 } 848 /* 849 * We also send the remote system the address we used to 850 * contact it in case it can help it connect back with us 851 */ 852 if (parms.r_addr == NULL) { 853 /* for XDRing */ 854 parms.r_addr = __UNCONST(&nullstring[0]); 855 } 856 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDRLIST, 857 (xdrproc_t) xdr_rpcb, (char *)(void *)&parms, 858 (xdrproc_t) xdr_rpcb_entry_list_ptr, 859 (char *)(void *)&relp, tottimeout); 860 if (clnt_st == RPC_SUCCESS) { 861 if ((address = got_entry(relp, nconf)) != NULL) { 862 xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr, 863 (char *)(void *)&relp); 864 CLNT_CONTROL(client, CLGET_SVC_ADDR, 865 (char *)(void *)&servaddr); 866 __rpc_fixup_addr(address, &servaddr); 867 goto done; 868 } 869 /* Entry not found for this transport */ 870 xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr, 871 (char *)(void *)&relp); 872 /* 873 * XXX: should have perhaps returned with error but 874 * since the remote machine might not always be able 875 * to send the address on all transports, we try the 876 * regular way with regular_rpcbind 877 */ 878 goto regular_rpcbind; 879 } else if ((clnt_st == RPC_PROGVERSMISMATCH) || 880 (clnt_st == RPC_PROGUNAVAIL)) { 881 start_vers = RPCBVERS; /* Try version 3 now */ 882 goto regular_rpcbind; /* Try different versions */ 883 } else { 884 rpc_createerr.cf_stat = RPC_PMAPFAILURE; 885 clnt_geterr(client, &rpc_createerr.cf_error); 886 goto error; 887 } 888 } 889 890 regular_rpcbind: 891 892 /* Now the same transport is to be used to get the address */ 893 #if 1 894 if (client && ((nconf->nc_semantics == NC_TPI_COTS_ORD) || 895 (nconf->nc_semantics == NC_TPI_COTS))) 896 #else 897 if (client && nconf->nc_semantics == NC_TPI_CLTS) 898 #endif 899 { 900 /* A CLTS type of client - destroy it */ 901 CLNT_DESTROY(client); 902 client = NULL; 903 } 904 905 if (client == NULL) { 906 client = getclnthandle(host, nconf, &parms.r_addr); 907 if (client == NULL) { 908 goto error; 909 } 910 } 911 if (parms.r_addr == NULL) 912 parms.r_addr = __UNCONST(&nullstring[0]); 913 914 /* First try from start_vers and then version 3 (RPCBVERS) */ 915 for (vers = start_vers; vers >= RPCBVERS; vers--) { 916 /* Set the version */ 917 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 918 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDR, 919 (xdrproc_t) xdr_rpcb, (char *)(void *)&parms, 920 (xdrproc_t) xdr_wrapstring, (char *)(void *) &ua, 921 tottimeout); 922 if (clnt_st == RPC_SUCCESS) { 923 if ((ua == NULL) || (ua[0] == 0)) { 924 /* address unknown */ 925 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 926 goto error; 927 } 928 address = uaddr2taddr(nconf, ua); 929 #ifdef ND_DEBUG 930 fprintf(stderr, "\tRemote address is [%s]\n", ua); 931 if (!address) 932 fprintf(stderr, 933 "\tCouldn't resolve remote address!\n"); 934 #endif 935 xdr_free((xdrproc_t)xdr_wrapstring, 936 (char *)(void *)&ua); 937 938 if (! address) { 939 /* We don't know about your universal address */ 940 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE; 941 goto error; 942 } 943 CLNT_CONTROL(client, CLGET_SVC_ADDR, 944 (char *)(void *)&servaddr); 945 __rpc_fixup_addr(address, &servaddr); 946 goto done; 947 } else if (clnt_st == RPC_PROGVERSMISMATCH) { 948 struct rpc_err rpcerr; 949 950 clnt_geterr(client, &rpcerr); 951 if (rpcerr.re_vers.low > RPCBVERS4) 952 goto error; /* a new version, can't handle */ 953 } else if (clnt_st != RPC_PROGUNAVAIL) { 954 /* Cant handle this error */ 955 rpc_createerr.cf_stat = clnt_st; 956 clnt_geterr(client, &rpc_createerr.cf_error); 957 goto error; 958 } 959 } 960 961 if ((address == NULL) || (address->len == 0)) { 962 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 963 clnt_geterr(client, &rpc_createerr.cf_error); 964 } 965 966 error: 967 if (client) { 968 CLNT_DESTROY(client); 969 client = NULL; 970 } 971 done: 972 if (nconf->nc_semantics != NC_TPI_CLTS) { 973 /* This client is the connectionless one */ 974 if (client) { 975 CLNT_DESTROY(client); 976 client = NULL; 977 } 978 } 979 if (clpp) { 980 *clpp = client; 981 } else if (client) { 982 CLNT_DESTROY(client); 983 } 984 return (address); 985 } 986 987 988 /* 989 * Find the mapped address for program, version. 990 * Calls the rpcbind service remotely to do the lookup. 991 * Uses the transport specified in nconf. 992 * Returns FALSE (0) if no map exists, else returns 1. 993 * 994 * Assuming that the address is all properly allocated 995 */ 996 int 997 rpcb_getaddr(program, version, nconf, address, host) 998 rpcprog_t program; 999 rpcvers_t version; 1000 const struct netconfig *nconf; 1001 struct netbuf *address; 1002 const char *host; 1003 { 1004 struct netbuf *na; 1005 1006 _DIAGASSERT(address != NULL); 1007 1008 if ((na = __rpcb_findaddr(program, version, nconf, 1009 host, (CLIENT **) NULL)) == NULL) 1010 return (FALSE); 1011 1012 if (na->len > address->maxlen) { 1013 /* Too long address */ 1014 free(na->buf); 1015 free(na); 1016 rpc_createerr.cf_stat = RPC_FAILED; 1017 return (FALSE); 1018 } 1019 memcpy(address->buf, na->buf, (size_t)na->len); 1020 address->len = na->len; 1021 free(na->buf); 1022 free(na); 1023 return (TRUE); 1024 } 1025 1026 /* 1027 * Get a copy of the current maps. 1028 * Calls the rpcbind service remotely to get the maps. 1029 * 1030 * It returns only a list of the services 1031 * It returns NULL on failure. 1032 */ 1033 rpcblist * 1034 rpcb_getmaps(nconf, host) 1035 const struct netconfig *nconf; 1036 const char *host; 1037 { 1038 rpcblist_ptr head = NULL; 1039 CLIENT *client; 1040 enum clnt_stat clnt_st; 1041 rpcvers_t vers = 0; 1042 1043 client = getclnthandle(host, nconf, NULL); 1044 if (client == NULL) { 1045 return (head); 1046 } 1047 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP, 1048 (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr, 1049 (char *)(void *)&head, tottimeout); 1050 if (clnt_st == RPC_SUCCESS) 1051 goto done; 1052 1053 if ((clnt_st != RPC_PROGVERSMISMATCH) && 1054 (clnt_st != RPC_PROGUNAVAIL)) { 1055 rpc_createerr.cf_stat = RPC_RPCBFAILURE; 1056 clnt_geterr(client, &rpc_createerr.cf_error); 1057 goto done; 1058 } 1059 1060 /* fall back to earlier version */ 1061 CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers); 1062 if (vers == RPCBVERS4) { 1063 vers = RPCBVERS; 1064 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 1065 if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP, 1066 (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr, 1067 (char *)(void *)&head, tottimeout) == RPC_SUCCESS) 1068 goto done; 1069 } 1070 rpc_createerr.cf_stat = RPC_RPCBFAILURE; 1071 clnt_geterr(client, &rpc_createerr.cf_error); 1072 1073 done: 1074 CLNT_DESTROY(client); 1075 return (head); 1076 } 1077 1078 /* 1079 * rpcbinder remote-call-service interface. 1080 * This routine is used to call the rpcbind remote call service 1081 * which will look up a service program in the address maps, and then 1082 * remotely call that routine with the given parameters. This allows 1083 * programs to do a lookup and call in one step. 1084 */ 1085 enum clnt_stat 1086 rpcb_rmtcall(nconf, host, prog, vers, proc, xdrargs, argsp, 1087 xdrres, resp, tout, addr_ptr) 1088 const struct netconfig *nconf; /* Netconfig structure */ 1089 const char *host; /* Remote host name */ 1090 rpcprog_t prog; 1091 rpcvers_t vers; 1092 rpcproc_t proc; /* Remote proc identifiers */ 1093 xdrproc_t xdrargs, xdrres; /* XDR routines */ 1094 const char *argsp; /* Argument */ 1095 caddr_t resp; /* Result */ 1096 struct timeval tout; /* Timeout value for this call */ 1097 const struct netbuf *addr_ptr; /* Preallocated netbuf address */ 1098 { 1099 CLIENT *client; 1100 enum clnt_stat stat; 1101 struct r_rpcb_rmtcallargs a; 1102 struct r_rpcb_rmtcallres r; 1103 rpcvers_t rpcb_vers; 1104 1105 stat = RPC_FAILED; /* XXXGCC -Wuninitialized [dreamcast] */ 1106 1107 client = getclnthandle(host, nconf, NULL); 1108 if (client == NULL) { 1109 return (RPC_FAILED); 1110 } 1111 CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, __UNCONST(&rmttimeout)); 1112 a.prog = prog; 1113 a.vers = vers; 1114 a.proc = proc; 1115 a.args.args_val = argsp; 1116 a.xdr_args = xdrargs; 1117 r.addr = NULL; 1118 r.results.results_val = resp; 1119 r.xdr_res = xdrres; 1120 1121 for (rpcb_vers = RPCBVERS4; rpcb_vers >= RPCBVERS; rpcb_vers--) { 1122 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&rpcb_vers); 1123 stat = CLNT_CALL(client, (rpcproc_t)RPCBPROC_CALLIT, 1124 (xdrproc_t) xdr_rpcb_rmtcallargs, (char *)(void *)&a, 1125 (xdrproc_t) xdr_rpcb_rmtcallres, (char *)(void *)&r, tout); 1126 if ((stat == RPC_SUCCESS) && (addr_ptr != NULL)) { 1127 struct netbuf *na; 1128 na = uaddr2taddr(__UNCONST(nconf), r.addr); 1129 if (!na) { 1130 stat = RPC_N2AXLATEFAILURE; 1131 ((struct netbuf *)__UNCONST(addr_ptr))->len = 0; 1132 goto error; 1133 } 1134 if (na->len > addr_ptr->maxlen) { 1135 /* Too long address */ 1136 stat = RPC_FAILED; /* XXX A better error no */ 1137 free(na->buf); 1138 free(na); 1139 ((struct netbuf *)__UNCONST(addr_ptr))->len = 0; 1140 goto error; 1141 } 1142 memcpy(addr_ptr->buf, na->buf, (size_t)na->len); 1143 ((struct netbuf *)__UNCONST(addr_ptr))->len = na->len; 1144 free(na->buf); 1145 free(na); 1146 break; 1147 } else if ((stat != RPC_PROGVERSMISMATCH) && 1148 (stat != RPC_PROGUNAVAIL)) { 1149 goto error; 1150 } 1151 } 1152 error: 1153 CLNT_DESTROY(client); 1154 if (r.addr) 1155 xdr_free((xdrproc_t) xdr_wrapstring, (char *)(void *)&r.addr); 1156 return (stat); 1157 } 1158 1159 /* 1160 * Gets the time on the remote host. 1161 * Returns 1 if succeeds else 0. 1162 */ 1163 bool_t 1164 rpcb_gettime(host, timep) 1165 const char *host; 1166 time_t *timep; 1167 { 1168 CLIENT *client = NULL; 1169 void *handle; 1170 struct netconfig *nconf; 1171 rpcvers_t vers; 1172 enum clnt_stat st; 1173 1174 1175 if ((host == NULL) || (host[0] == 0)) { 1176 time(timep); 1177 return (TRUE); 1178 } 1179 1180 if ((handle = __rpc_setconf("netpath")) == NULL) { 1181 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1182 return (FALSE); 1183 } 1184 rpc_createerr.cf_stat = RPC_SUCCESS; 1185 while (client == NULL) { 1186 if ((nconf = __rpc_getconf(handle)) == NULL) { 1187 if (rpc_createerr.cf_stat == RPC_SUCCESS) 1188 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1189 break; 1190 } 1191 client = getclnthandle(host, nconf, NULL); 1192 if (client) 1193 break; 1194 } 1195 __rpc_endconf(handle); 1196 if (client == (CLIENT *) NULL) { 1197 return (FALSE); 1198 } 1199 1200 st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME, 1201 (xdrproc_t) xdr_void, NULL, 1202 (xdrproc_t) xdr_int, (char *)(void *)timep, tottimeout); 1203 1204 if ((st == RPC_PROGVERSMISMATCH) || (st == RPC_PROGUNAVAIL)) { 1205 CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers); 1206 if (vers == RPCBVERS4) { 1207 /* fall back to earlier version */ 1208 vers = RPCBVERS; 1209 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 1210 st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME, 1211 (xdrproc_t) xdr_void, NULL, 1212 (xdrproc_t) xdr_int, (char *)(void *)timep, 1213 tottimeout); 1214 } 1215 } 1216 CLNT_DESTROY(client); 1217 return (st == RPC_SUCCESS? TRUE: FALSE); 1218 } 1219 1220 /* 1221 * Converts taddr to universal address. This routine should never 1222 * really be called because local n2a libraries are always provided. 1223 */ 1224 char * 1225 rpcb_taddr2uaddr(nconf, taddr) 1226 struct netconfig *nconf; 1227 struct netbuf *taddr; 1228 { 1229 CLIENT *client; 1230 char *uaddr = NULL; 1231 1232 1233 /* parameter checking */ 1234 if (nconf == NULL) { 1235 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1236 return (NULL); 1237 } 1238 if (taddr == NULL) { 1239 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 1240 return (NULL); 1241 } 1242 client = local_rpcb(); 1243 if (! client) { 1244 return (NULL); 1245 } 1246 1247 CLNT_CALL(client, (rpcproc_t)RPCBPROC_TADDR2UADDR, 1248 (xdrproc_t) xdr_netbuf, (char *)(void *)taddr, 1249 (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr, tottimeout); 1250 CLNT_DESTROY(client); 1251 return (uaddr); 1252 } 1253 1254 /* 1255 * Converts universal address to netbuf. This routine should never 1256 * really be called because local n2a libraries are always provided. 1257 */ 1258 struct netbuf * 1259 rpcb_uaddr2taddr(nconf, uaddr) 1260 struct netconfig *nconf; 1261 char *uaddr; 1262 { 1263 CLIENT *client; 1264 struct netbuf *taddr; 1265 1266 1267 /* parameter checking */ 1268 if (nconf == NULL) { 1269 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1270 return (NULL); 1271 } 1272 if (uaddr == NULL) { 1273 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 1274 return (NULL); 1275 } 1276 client = local_rpcb(); 1277 if (! client) { 1278 return (NULL); 1279 } 1280 1281 taddr = (struct netbuf *)calloc(1, sizeof (struct netbuf)); 1282 if (taddr == NULL) { 1283 CLNT_DESTROY(client); 1284 return (NULL); 1285 } 1286 if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_UADDR2TADDR, 1287 (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr, 1288 (xdrproc_t) xdr_netbuf, (char *)(void *)taddr, 1289 tottimeout) != RPC_SUCCESS) { 1290 free(taddr); 1291 taddr = NULL; 1292 } 1293 CLNT_DESTROY(client); 1294 return (taddr); 1295 } 1296