1 /* $NetBSD: rpcb_clnt.c,v 1.11 2002/10/02 01:22:09 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 38 #if 0 39 #if !defined(lint) && defined(SCCSIDS) 40 static char sccsid[] = "@(#)rpcb_clnt.c 1.30 89/06/21 Copyr 1988 Sun Micro"; 41 #endif 42 #endif 43 44 /* 45 * rpcb_clnt.c 46 * interface to rpcbind rpc service. 47 * 48 * Copyright (C) 1988, Sun Microsystems, Inc. 49 */ 50 51 #include "namespace.h" 52 #include "reentrant.h" 53 #include <sys/types.h> 54 #include <sys/socket.h> 55 #include <sys/un.h> 56 #include <sys/utsname.h> 57 #include <rpc/rpc.h> 58 #include <rpc/rpcb_prot.h> 59 #include <rpc/nettype.h> 60 #include <netconfig.h> 61 #ifdef PORTMAP 62 #include <netinet/in.h> /* FOR IPPROTO_TCP/UDP definitions */ 63 #include <rpc/pmap_prot.h> 64 #endif 65 #include <assert.h> 66 #include <errno.h> 67 #include <netdb.h> 68 #include <stdio.h> 69 #include <stdlib.h> 70 #include <string.h> 71 #include <syslog.h> 72 #include <unistd.h> 73 74 #include "rpc_com.h" 75 76 #ifdef __weak_alias 77 __weak_alias(rpcb_set,_rpcb_set) 78 __weak_alias(rpcb_unset,_rpcb_unset) 79 __weak_alias(rpcb_getmaps,_rpcb_getmaps) 80 __weak_alias(rpcb_rmtcall,_rpcb_rmtcall) 81 __weak_alias(rpcb_gettime,_rpcb_gettime) 82 __weak_alias(rpcb_taddr2uaddr,_rpcb_taddr2uaddr) 83 __weak_alias(rpcb_uaddr2taddr,_rpcb_uaddr2taddr) 84 #endif 85 86 static struct timeval tottimeout = { 60, 0 }; 87 static const struct timeval rmttimeout = { 3, 0 }; 88 89 static const char nullstring[] = "\000"; 90 91 #define CACHESIZE 6 92 93 struct address_cache { 94 char *ac_host; 95 char *ac_netid; 96 char *ac_uaddr; 97 struct netbuf *ac_taddr; 98 struct address_cache *ac_next; 99 }; 100 101 static struct address_cache *front; 102 static int cachesize; 103 104 #define CLCR_GET_RPCB_TIMEOUT 1 105 #define CLCR_SET_RPCB_TIMEOUT 2 106 107 108 extern int __rpc_lowvers; 109 110 static struct address_cache *check_cache __P((const char *, const char *)); 111 static void delete_cache __P((struct netbuf *)); 112 static void add_cache __P((const char *, const char *, struct netbuf *, 113 char *)); 114 static CLIENT *getclnthandle __P((const char *, const struct netconfig *, 115 char **)); 116 static CLIENT *local_rpcb __P((void)); 117 static struct netbuf *got_entry __P((rpcb_entry_list_ptr, 118 const struct netconfig *)); 119 120 /* 121 * This routine adjusts the timeout used for calls to the remote rpcbind. 122 * Also, this routine can be used to set the use of portmapper version 2 123 * only when doing rpc_broadcasts 124 * These are private routines that may not be provided in future releases. 125 */ 126 bool_t 127 __rpc_control(request, info) 128 int request; 129 void *info; 130 { 131 132 _DIAGASSERT(info != NULL); 133 134 switch (request) { 135 case CLCR_GET_RPCB_TIMEOUT: 136 *(struct timeval *)info = tottimeout; 137 break; 138 case CLCR_SET_RPCB_TIMEOUT: 139 tottimeout = *(struct timeval *)info; 140 break; 141 case CLCR_SET_LOWVERS: 142 __rpc_lowvers = *(int *)info; 143 break; 144 case CLCR_GET_LOWVERS: 145 *(int *)info = __rpc_lowvers; 146 break; 147 default: 148 return (FALSE); 149 } 150 return (TRUE); 151 } 152 153 /* 154 * It might seem that a reader/writer lock would be more reasonable here. 155 * However because getclnthandle(), the only user of the cache functions, 156 * may do a delete_cache() operation if a check_cache() fails to return an 157 * address useful to clnt_tli_create(), we may as well use a mutex. 158 */ 159 /* 160 * As it turns out, if the cache lock is *not* a reader/writer lock, we will 161 * block all clnt_create's if we are trying to connect to a host that's down, 162 * since the lock will be held all during that time. 163 */ 164 #ifdef __REENT 165 extern rwlock_t rpcbaddr_cache_lock; 166 #endif 167 168 /* 169 * The routines check_cache(), add_cache(), delete_cache() manage the 170 * cache of rpcbind addresses for (host, netid). 171 */ 172 173 static struct address_cache * 174 check_cache(host, netid) 175 const char *host, *netid; 176 { 177 struct address_cache *cptr; 178 179 _DIAGASSERT(host != NULL); 180 _DIAGASSERT(netid != NULL); 181 182 /* READ LOCK HELD ON ENTRY: rpcbaddr_cache_lock */ 183 184 for (cptr = front; cptr != NULL; cptr = cptr->ac_next) { 185 if (!strcmp(cptr->ac_host, host) && 186 !strcmp(cptr->ac_netid, netid)) { 187 #ifdef ND_DEBUG 188 fprintf(stderr, "Found cache entry for %s: %s\n", 189 host, netid); 190 #endif 191 return (cptr); 192 } 193 } 194 return ((struct address_cache *) NULL); 195 } 196 197 static void 198 delete_cache(addr) 199 struct netbuf *addr; 200 { 201 struct address_cache *cptr, *prevptr = NULL; 202 203 _DIAGASSERT(addr != NULL); 204 205 /* WRITE LOCK HELD ON ENTRY: rpcbaddr_cache_lock */ 206 for (cptr = front; cptr != NULL; cptr = cptr->ac_next) { 207 if (!memcmp(cptr->ac_taddr->buf, addr->buf, addr->len)) { 208 free(cptr->ac_host); 209 free(cptr->ac_netid); 210 free(cptr->ac_taddr->buf); 211 free(cptr->ac_taddr); 212 if (cptr->ac_uaddr) 213 free(cptr->ac_uaddr); 214 if (prevptr) 215 prevptr->ac_next = cptr->ac_next; 216 else 217 front = cptr->ac_next; 218 free(cptr); 219 cachesize--; 220 break; 221 } 222 prevptr = cptr; 223 } 224 } 225 226 static void 227 add_cache(host, netid, taddr, uaddr) 228 const char *host, *netid; 229 char *uaddr; 230 struct netbuf *taddr; 231 { 232 struct address_cache *ad_cache, *cptr, *prevptr; 233 234 _DIAGASSERT(host != NULL); 235 _DIAGASSERT(netid != NULL); 236 /* uaddr may be NULL */ 237 /* taddr may be NULL ??? */ 238 239 ad_cache = (struct address_cache *) 240 malloc(sizeof (struct address_cache)); 241 if (!ad_cache) { 242 return; 243 } 244 ad_cache->ac_host = strdup(host); 245 ad_cache->ac_netid = strdup(netid); 246 ad_cache->ac_uaddr = uaddr ? strdup(uaddr) : NULL; 247 ad_cache->ac_taddr = (struct netbuf *)malloc(sizeof (struct netbuf)); 248 if (!ad_cache->ac_host || !ad_cache->ac_netid || !ad_cache->ac_taddr || 249 (uaddr && !ad_cache->ac_uaddr)) { 250 return; 251 } 252 ad_cache->ac_taddr->len = ad_cache->ac_taddr->maxlen = taddr->len; 253 ad_cache->ac_taddr->buf = (char *) malloc(taddr->len); 254 if (ad_cache->ac_taddr->buf == NULL) { 255 return; 256 } 257 memcpy(ad_cache->ac_taddr->buf, taddr->buf, taddr->len); 258 #ifdef ND_DEBUG 259 fprintf(stderr, "Added to cache: %s : %s\n", host, netid); 260 #endif 261 262 /* VARIABLES PROTECTED BY rpcbaddr_cache_lock: cptr */ 263 264 rwlock_wrlock(&rpcbaddr_cache_lock); 265 if (cachesize < CACHESIZE) { 266 ad_cache->ac_next = front; 267 front = ad_cache; 268 cachesize++; 269 } else { 270 /* Free the last entry */ 271 cptr = front; 272 prevptr = NULL; 273 while (cptr->ac_next) { 274 prevptr = cptr; 275 cptr = cptr->ac_next; 276 } 277 278 #ifdef ND_DEBUG 279 fprintf(stderr, "Deleted from cache: %s : %s\n", 280 cptr->ac_host, cptr->ac_netid); 281 #endif 282 free(cptr->ac_host); 283 free(cptr->ac_netid); 284 free(cptr->ac_taddr->buf); 285 free(cptr->ac_taddr); 286 if (cptr->ac_uaddr) 287 free(cptr->ac_uaddr); 288 289 if (prevptr) { 290 prevptr->ac_next = NULL; 291 ad_cache->ac_next = front; 292 front = ad_cache; 293 } else { 294 front = ad_cache; 295 ad_cache->ac_next = NULL; 296 } 297 free(cptr); 298 } 299 rwlock_unlock(&rpcbaddr_cache_lock); 300 } 301 302 /* 303 * This routine will return a client handle that is connected to the 304 * rpcbind. Returns NULL on error and free's everything. 305 */ 306 static CLIENT * 307 getclnthandle(host, nconf, targaddr) 308 const char *host; 309 const struct netconfig *nconf; 310 char **targaddr; 311 { 312 CLIENT *client; 313 struct netbuf *addr, taddr; 314 struct netbuf addr_to_delete; 315 struct __rpc_sockinfo si; 316 struct addrinfo hints, *res, *tres; 317 struct address_cache *ad_cache; 318 char *tmpaddr; 319 320 _DIAGASSERT(host != NULL); 321 _DIAGASSERT(nconf != NULL); 322 /* targaddr may be NULL */ 323 324 /* VARIABLES PROTECTED BY rpcbaddr_cache_lock: ad_cache */ 325 326 /* Get the address of the rpcbind. Check cache first */ 327 addr_to_delete.len = 0; 328 rwlock_rdlock(&rpcbaddr_cache_lock); 329 ad_cache = check_cache(host, nconf->nc_netid); 330 if (ad_cache != NULL) { 331 addr = ad_cache->ac_taddr; 332 client = clnt_tli_create(RPC_ANYFD, nconf, addr, 333 (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0); 334 if (client != NULL) { 335 if (targaddr) 336 *targaddr = ad_cache->ac_uaddr; 337 rwlock_unlock(&rpcbaddr_cache_lock); 338 return (client); 339 } 340 addr_to_delete.len = addr->len; 341 addr_to_delete.buf = (char *)malloc(addr->len); 342 if (addr_to_delete.buf == NULL) { 343 addr_to_delete.len = 0; 344 } else { 345 memcpy(addr_to_delete.buf, addr->buf, addr->len); 346 } 347 } 348 rwlock_unlock(&rpcbaddr_cache_lock); 349 if (addr_to_delete.len != 0) { 350 /* 351 * Assume this may be due to cache data being 352 * outdated 353 */ 354 rwlock_wrlock(&rpcbaddr_cache_lock); 355 delete_cache(&addr_to_delete); 356 rwlock_unlock(&rpcbaddr_cache_lock); 357 free(addr_to_delete.buf); 358 } 359 if (!__rpc_nconf2sockinfo(nconf, &si)) { 360 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 361 return NULL; 362 } 363 364 memset(&hints, 0, sizeof hints); 365 hints.ai_family = si.si_af; 366 hints.ai_socktype = si.si_socktype; 367 hints.ai_protocol = si.si_proto; 368 369 #ifdef CLNT_DEBUG 370 printf("trying netid %s family %d proto %d socktype %d\n", 371 nconf->nc_netid, si.si_af, si.si_proto, si.si_socktype); 372 #endif 373 374 if (getaddrinfo(host, "sunrpc", &hints, &res) != 0) { 375 rpc_createerr.cf_stat = RPC_UNKNOWNHOST; 376 return NULL; 377 } 378 379 for (tres = res; tres != NULL; tres = tres->ai_next) { 380 taddr.buf = tres->ai_addr; 381 taddr.len = taddr.maxlen = tres->ai_addrlen; 382 383 #ifdef ND_DEBUG 384 { 385 char *ua; 386 387 ua = taddr2uaddr(nconf, &taddr); 388 fprintf(stderr, "Got it [%s]\n", ua); 389 free(ua); 390 } 391 #endif 392 393 #ifdef ND_DEBUG 394 { 395 int i; 396 397 fprintf(stderr, "\tnetbuf len = %d, maxlen = %d\n", 398 taddr.len, taddr.maxlen); 399 fprintf(stderr, "\tAddress is "); 400 for (i = 0; i < taddr.len; i++) 401 fprintf(stderr, "%u.", ((char *)(taddr.buf))[i]); 402 fprintf(stderr, "\n"); 403 } 404 #endif 405 client = clnt_tli_create(RPC_ANYFD, nconf, &taddr, 406 (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0); 407 #ifdef ND_DEBUG 408 if (! client) { 409 clnt_pcreateerror("rpcbind clnt interface"); 410 } 411 #endif 412 413 if (client) { 414 tmpaddr = targaddr ? taddr2uaddr(nconf, &taddr) : NULL; 415 add_cache(host, nconf->nc_netid, &taddr, tmpaddr); 416 if (targaddr) 417 *targaddr = tmpaddr; 418 break; 419 } 420 } 421 freeaddrinfo(res); 422 return (client); 423 } 424 425 /* XXX */ 426 #define IN4_LOCALHOST_STRING "127.0.0.1" 427 #define IN6_LOCALHOST_STRING "::1" 428 429 /* 430 * This routine will return a client handle that is connected to the local 431 * rpcbind. Returns NULL on error and free's everything. 432 */ 433 static CLIENT * 434 local_rpcb() 435 { 436 CLIENT *client; 437 static struct netconfig *loopnconf; 438 static char *hostname; 439 #ifdef __REENT 440 extern mutex_t loopnconf_lock; 441 #endif 442 int sock; 443 size_t tsize; 444 struct netbuf nbuf; 445 struct sockaddr_un sun; 446 447 /* 448 * Try connecting to the local rpcbind through a local socket 449 * first. If this doesn't work, try all transports defined in 450 * the netconfig file. 451 */ 452 memset(&sun, 0, sizeof sun); 453 sock = socket(AF_LOCAL, SOCK_STREAM, 0); 454 if (sock < 0) 455 goto try_nconf; 456 sun.sun_family = AF_LOCAL; 457 strcpy(sun.sun_path, _PATH_RPCBINDSOCK); 458 nbuf.len = sun.sun_len = SUN_LEN(&sun); 459 nbuf.maxlen = sizeof (struct sockaddr_un); 460 nbuf.buf = &sun; 461 462 tsize = __rpc_get_t_size(AF_LOCAL, 0, 0); 463 client = clnt_vc_create(sock, &nbuf, (rpcprog_t)RPCBPROG, 464 (rpcvers_t)RPCBVERS, tsize, tsize); 465 466 if (client != NULL) { 467 /* XXX - mark the socket to be closed in destructor */ 468 (void) CLNT_CONTROL(client, CLSET_FD_CLOSE, NULL); 469 return client; 470 } 471 472 /* XXX - nobody needs this socket anymore, free the descriptor */ 473 close(sock); 474 475 try_nconf: 476 477 /* VARIABLES PROTECTED BY loopnconf_lock: loopnconf */ 478 mutex_lock(&loopnconf_lock); 479 if (loopnconf == NULL) { 480 struct netconfig *nconf, *tmpnconf = NULL; 481 void *nc_handle; 482 int fd; 483 484 nc_handle = setnetconfig(); 485 if (nc_handle == NULL) { 486 /* fails to open netconfig file */ 487 syslog (LOG_ERR, "rpc: failed to open " NETCONFIG); 488 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 489 mutex_unlock(&loopnconf_lock); 490 return (NULL); 491 } 492 while ((nconf = getnetconfig(nc_handle)) != NULL) { 493 #ifdef INET6 494 if ((strcmp(nconf->nc_protofmly, NC_INET6) == 0 || 495 #else 496 if (( 497 #endif 498 strcmp(nconf->nc_protofmly, NC_INET) == 0) && 499 (nconf->nc_semantics == NC_TPI_COTS || 500 nconf->nc_semantics == NC_TPI_COTS_ORD)) { 501 fd = __rpc_nconf2fd(nconf); 502 /* 503 * Can't create a socket, assume that 504 * this family isn't configured in the kernel. 505 */ 506 if (fd < 0) 507 continue; 508 close(fd); 509 tmpnconf = nconf; 510 if (!strcmp(nconf->nc_protofmly, NC_INET)) 511 hostname = IN4_LOCALHOST_STRING; 512 else 513 hostname = IN6_LOCALHOST_STRING; 514 } 515 } 516 if (tmpnconf == NULL) { 517 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 518 mutex_unlock(&loopnconf_lock); 519 return (NULL); 520 } 521 loopnconf = getnetconfigent(tmpnconf->nc_netid); 522 /* loopnconf is never freed */ 523 endnetconfig(nc_handle); 524 } 525 mutex_unlock(&loopnconf_lock); 526 client = getclnthandle(hostname, loopnconf, NULL); 527 return (client); 528 } 529 530 /* 531 * Set a mapping between program, version and address. 532 * Calls the rpcbind service to do the mapping. 533 */ 534 bool_t 535 rpcb_set(program, version, nconf, address) 536 rpcprog_t program; 537 rpcvers_t version; 538 const struct netconfig *nconf; /* Network structure of transport */ 539 const struct netbuf *address; /* Services netconfig address */ 540 { 541 CLIENT *client; 542 bool_t rslt = FALSE; 543 RPCB parms; 544 char uidbuf[32]; 545 546 /* parameter checking */ 547 if (nconf == NULL) { 548 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 549 return (FALSE); 550 } 551 if (address == NULL) { 552 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 553 return (FALSE); 554 } 555 client = local_rpcb(); 556 if (! client) { 557 return (FALSE); 558 } 559 560 /* convert to universal */ 561 /*LINTED const castaway*/ 562 parms.r_addr = taddr2uaddr((struct netconfig *) nconf, 563 (struct netbuf *)address); 564 if (!parms.r_addr) { 565 CLNT_DESTROY(client); 566 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE; 567 return (FALSE); /* no universal address */ 568 } 569 parms.r_prog = program; 570 parms.r_vers = version; 571 parms.r_netid = nconf->nc_netid; 572 /* 573 * Though uid is not being used directly, we still send it for 574 * completeness. For non-unix platforms, perhaps some other 575 * string or an empty string can be sent. 576 */ 577 (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid()); 578 parms.r_owner = uidbuf; 579 580 CLNT_CALL(client, (rpcproc_t)RPCBPROC_SET, (xdrproc_t) xdr_rpcb, 581 (char *)(void *)&parms, (xdrproc_t) xdr_bool, 582 (char *)(void *)&rslt, tottimeout); 583 584 CLNT_DESTROY(client); 585 free(parms.r_addr); 586 return (rslt); 587 } 588 589 /* 590 * Remove the mapping between program, version and netbuf address. 591 * Calls the rpcbind service to do the un-mapping. 592 * If netbuf is NULL, unset for all the transports, otherwise unset 593 * only for the given transport. 594 */ 595 bool_t 596 rpcb_unset(program, version, nconf) 597 rpcprog_t program; 598 rpcvers_t version; 599 const struct netconfig *nconf; 600 { 601 CLIENT *client; 602 bool_t rslt = FALSE; 603 RPCB parms; 604 char uidbuf[32]; 605 606 client = local_rpcb(); 607 if (! client) { 608 return (FALSE); 609 } 610 611 parms.r_prog = program; 612 parms.r_vers = version; 613 if (nconf) 614 parms.r_netid = nconf->nc_netid; 615 else { 616 /*LINTED const castaway*/ 617 parms.r_netid = (char *) &nullstring[0]; /* unsets all */ 618 } 619 /*LINTED const castaway*/ 620 parms.r_addr = (char *) &nullstring[0]; 621 (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid()); 622 parms.r_owner = uidbuf; 623 624 CLNT_CALL(client, (rpcproc_t)RPCBPROC_UNSET, (xdrproc_t) xdr_rpcb, 625 (char *)(void *)&parms, (xdrproc_t) xdr_bool, 626 (char *)(void *)&rslt, tottimeout); 627 628 CLNT_DESTROY(client); 629 return (rslt); 630 } 631 632 /* 633 * From the merged list, find the appropriate entry 634 */ 635 static struct netbuf * 636 got_entry(relp, nconf) 637 rpcb_entry_list_ptr relp; 638 const struct netconfig *nconf; 639 { 640 struct netbuf *na = NULL; 641 rpcb_entry_list_ptr sp; 642 rpcb_entry *rmap; 643 644 _DIAGASSERT(nconf != NULL); 645 646 for (sp = relp; sp != NULL; sp = sp->rpcb_entry_next) { 647 rmap = &sp->rpcb_entry_map; 648 if ((strcmp(nconf->nc_proto, rmap->r_nc_proto) == 0) && 649 (strcmp(nconf->nc_protofmly, rmap->r_nc_protofmly) == 0) && 650 (nconf->nc_semantics == rmap->r_nc_semantics) && 651 (rmap->r_maddr != NULL) && (rmap->r_maddr[0] != NULL)) { 652 na = uaddr2taddr(nconf, rmap->r_maddr); 653 #ifdef ND_DEBUG 654 fprintf(stderr, "\tRemote address is [%s].\n", 655 rmap->r_maddr); 656 if (!na) 657 fprintf(stderr, 658 "\tCouldn't resolve remote address!\n"); 659 #endif 660 break; 661 } 662 } 663 return (na); 664 } 665 666 /* 667 * An internal function which optimizes rpcb_getaddr function. It also 668 * returns the client handle that it uses to contact the remote rpcbind. 669 * 670 * The algorithm used: If the transports is TCP or UDP, it first tries 671 * version 2 (portmap), 4 and then 3 (svr4). This order should be 672 * changed in the next OS release to 4, 2 and 3. We are assuming that by 673 * that time, version 4 would be available on many machines on the network. 674 * With this algorithm, we get performance as well as a plan for 675 * obsoleting version 2. 676 * 677 * For all other transports, the algorithm remains as 4 and then 3. 678 * 679 * XXX: Due to some problems with t_connect(), we do not reuse the same client 680 * handle for COTS cases and hence in these cases we do not return the 681 * client handle. This code will change if t_connect() ever 682 * starts working properly. Also look under clnt_vc.c. 683 */ 684 struct netbuf * 685 __rpcb_findaddr(program, version, nconf, host, clpp) 686 rpcprog_t program; 687 rpcvers_t version; 688 const struct netconfig *nconf; 689 const char *host; 690 CLIENT **clpp; 691 { 692 CLIENT *client = NULL; 693 RPCB parms; 694 enum clnt_stat clnt_st; 695 char *ua = NULL; 696 rpcvers_t vers; 697 struct netbuf *address = NULL; 698 rpcvers_t start_vers = RPCBVERS4; 699 struct netbuf servaddr; 700 701 /* nconf is handled below */ 702 _DIAGASSERT(host != NULL); 703 /* clpp may be NULL */ 704 705 /* parameter checking */ 706 if (nconf == NULL) { 707 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 708 return (NULL); 709 } 710 711 parms.r_addr = NULL; 712 713 #ifdef PORTMAP 714 /* Try version 2 for TCP or UDP */ 715 if (strcmp(nconf->nc_protofmly, NC_INET) == 0) { 716 u_short port = 0; 717 struct netbuf remote; 718 rpcvers_t pmapvers = 2; 719 struct pmap pmapparms; 720 721 /* 722 * Try UDP only - there are some portmappers out 723 * there that use UDP only. 724 */ 725 if (strcmp(nconf->nc_proto, NC_TCP) == 0) { 726 struct netconfig *newnconf; 727 728 if ((newnconf = getnetconfigent("udp")) == NULL) { 729 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 730 return (NULL); 731 } 732 client = getclnthandle(host, newnconf, &parms.r_addr); 733 freenetconfigent(newnconf); 734 } else { 735 client = getclnthandle(host, nconf, &parms.r_addr); 736 } 737 if (client == NULL) { 738 return (NULL); 739 } 740 741 /* Set the version */ 742 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&pmapvers); 743 pmapparms.pm_prog = program; 744 pmapparms.pm_vers = version; 745 pmapparms.pm_prot = strcmp(nconf->nc_proto, NC_TCP) ? 746 IPPROTO_UDP : IPPROTO_TCP; 747 pmapparms.pm_port = 0; /* not needed */ 748 clnt_st = CLNT_CALL(client, (rpcproc_t)PMAPPROC_GETPORT, 749 (xdrproc_t) xdr_pmap, (caddr_t)(void *)&pmapparms, 750 (xdrproc_t) xdr_u_short, (caddr_t)(void *)&port, 751 tottimeout); 752 if (clnt_st != RPC_SUCCESS) { 753 if ((clnt_st == RPC_PROGVERSMISMATCH) || 754 (clnt_st == RPC_PROGUNAVAIL)) 755 goto try_rpcbind; /* Try different versions */ 756 rpc_createerr.cf_stat = RPC_PMAPFAILURE; 757 clnt_geterr(client, &rpc_createerr.cf_error); 758 goto error; 759 } else if (port == 0) { 760 address = NULL; 761 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 762 goto error; 763 } 764 port = htons(port); 765 CLNT_CONTROL(client, CLGET_SVC_ADDR, (char *)(void *)&remote); 766 if (((address = (struct netbuf *) 767 malloc(sizeof (struct netbuf))) == NULL) || 768 ((address->buf = (char *) 769 malloc(remote.len)) == NULL)) { 770 rpc_createerr.cf_stat = RPC_SYSTEMERROR; 771 clnt_geterr(client, &rpc_createerr.cf_error); 772 if (address) { 773 free(address); 774 address = NULL; 775 } 776 goto error; 777 } 778 memcpy(address->buf, remote.buf, remote.len); 779 memcpy(&((char *)address->buf)[sizeof (short)], 780 (char *)(void *)&port, sizeof (short)); 781 address->len = address->maxlen = remote.len; 782 goto done; 783 } 784 #endif 785 786 try_rpcbind: 787 /* 788 * Now we try version 4 and then 3. 789 * We also send the remote system the address we used to 790 * contact it in case it can help to connect back with us 791 */ 792 parms.r_prog = program; 793 parms.r_vers = version; 794 /*LINTED const castaway*/ 795 parms.r_owner = (char *) &nullstring[0]; /* not needed; */ 796 /* just for xdring */ 797 parms.r_netid = nconf->nc_netid; /* not really needed */ 798 799 /* 800 * If a COTS transport is being used, try getting address via CLTS 801 * transport. This works only with version 4. 802 * NOTE: This is being done for all transports EXCEPT LOOPBACK 803 * because with loopback the cost to go to a COTS is same as 804 * the cost to go through CLTS, plus you get the advantage of 805 * finding out immediately if the local rpcbind process is dead. 806 */ 807 #if 1 808 if ((nconf->nc_semantics == NC_TPI_COTS_ORD || 809 nconf->nc_semantics == NC_TPI_COTS) && 810 (strcmp(nconf->nc_protofmly, NC_LOOPBACK) != 0)) 811 #else 812 if (client != NULL) { 813 CLNT_DESTROY(client); 814 client = NULL; 815 } 816 if (nconf->nc_semantics == NC_TPI_CLTS) 817 #endif 818 { 819 void *handle; 820 struct netconfig *nconf_clts; 821 rpcb_entry_list_ptr relp = NULL; 822 823 if (client == NULL) { 824 /* This did not go through the above PORTMAP/TCP code */ 825 #if 1 826 if ((handle = __rpc_setconf("datagram_v")) != NULL) 827 #else 828 if ((handle = __rpc_setconf("circuit_v")) != NULL) 829 #endif 830 { 831 while ((nconf_clts = __rpc_getconf(handle)) 832 != NULL) { 833 if (strcmp(nconf_clts->nc_protofmly, 834 nconf->nc_protofmly) != 0) { 835 continue; 836 } 837 client = getclnthandle(host, nconf_clts, 838 &parms.r_addr); 839 break; 840 } 841 __rpc_endconf(handle); 842 } 843 if (client == NULL) 844 goto regular_rpcbind; /* Go the regular way */ 845 } else { 846 /* This is a UDP PORTMAP handle. Change to version 4 */ 847 vers = RPCBVERS4; 848 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 849 } 850 /* 851 * We also send the remote system the address we used to 852 * contact it in case it can help it connect back with us 853 */ 854 if (parms.r_addr == NULL) { 855 /*LINTED const castaway*/ 856 parms.r_addr = (char *) &nullstring[0]; /* for XDRing */ 857 } 858 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDRLIST, 859 (xdrproc_t) xdr_rpcb, (char *)(void *)&parms, 860 (xdrproc_t) xdr_rpcb_entry_list_ptr, 861 (char *)(void *)&relp, tottimeout); 862 if (clnt_st == RPC_SUCCESS) { 863 if ((address = got_entry(relp, nconf)) != NULL) { 864 xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr, 865 (char *)(void *)&relp); 866 CLNT_CONTROL(client, CLGET_SVC_ADDR, 867 (char *)(void *)&servaddr); 868 __rpc_fixup_addr(address, &servaddr); 869 goto done; 870 } 871 /* Entry not found for this transport */ 872 xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr, 873 (char *)(void *)&relp); 874 /* 875 * XXX: should have perhaps returned with error but 876 * since the remote machine might not always be able 877 * to send the address on all transports, we try the 878 * regular way with regular_rpcbind 879 */ 880 goto regular_rpcbind; 881 } else if ((clnt_st == RPC_PROGVERSMISMATCH) || 882 (clnt_st == RPC_PROGUNAVAIL)) { 883 start_vers = RPCBVERS; /* Try version 3 now */ 884 goto regular_rpcbind; /* Try different versions */ 885 } else { 886 rpc_createerr.cf_stat = RPC_PMAPFAILURE; 887 clnt_geterr(client, &rpc_createerr.cf_error); 888 goto error; 889 } 890 } 891 892 regular_rpcbind: 893 894 /* Now the same transport is to be used to get the address */ 895 #if 1 896 if (client && ((nconf->nc_semantics == NC_TPI_COTS_ORD) || 897 (nconf->nc_semantics == NC_TPI_COTS))) 898 #else 899 if (client && nconf->nc_semantics == NC_TPI_CLTS) 900 #endif 901 { 902 /* A CLTS type of client - destroy it */ 903 CLNT_DESTROY(client); 904 client = NULL; 905 } 906 907 if (client == NULL) { 908 client = getclnthandle(host, nconf, &parms.r_addr); 909 if (client == NULL) { 910 goto error; 911 } 912 } 913 if (parms.r_addr == NULL) { 914 /*LINTED const castaway*/ 915 parms.r_addr = (char *) &nullstring[0]; 916 } 917 918 /* First try from start_vers and then version 3 (RPCBVERS) */ 919 for (vers = start_vers; vers >= RPCBVERS; vers--) { 920 /* Set the version */ 921 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 922 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDR, 923 (xdrproc_t) xdr_rpcb, (char *)(void *)&parms, 924 (xdrproc_t) xdr_wrapstring, (char *)(void *) &ua, 925 tottimeout); 926 if (clnt_st == RPC_SUCCESS) { 927 if ((ua == NULL) || (ua[0] == NULL)) { 928 /* address unknown */ 929 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 930 goto error; 931 } 932 address = uaddr2taddr(nconf, ua); 933 #ifdef ND_DEBUG 934 fprintf(stderr, "\tRemote address is [%s]\n", ua); 935 if (!address) 936 fprintf(stderr, 937 "\tCouldn't resolve remote address!\n"); 938 #endif 939 xdr_free((xdrproc_t)xdr_wrapstring, 940 (char *)(void *)&ua); 941 942 if (! address) { 943 /* We don't know about your universal address */ 944 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE; 945 goto error; 946 } 947 CLNT_CONTROL(client, CLGET_SVC_ADDR, 948 (char *)(void *)&servaddr); 949 __rpc_fixup_addr(address, &servaddr); 950 goto done; 951 } else if (clnt_st == RPC_PROGVERSMISMATCH) { 952 struct rpc_err rpcerr; 953 954 clnt_geterr(client, &rpcerr); 955 if (rpcerr.re_vers.low > RPCBVERS4) 956 goto error; /* a new version, can't handle */ 957 } else if (clnt_st != RPC_PROGUNAVAIL) { 958 /* Cant handle this error */ 959 rpc_createerr.cf_stat = clnt_st; 960 clnt_geterr(client, &rpc_createerr.cf_error); 961 goto error; 962 } 963 } 964 965 if ((address == NULL) || (address->len == 0)) { 966 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 967 clnt_geterr(client, &rpc_createerr.cf_error); 968 } 969 970 error: 971 if (client) { 972 CLNT_DESTROY(client); 973 client = NULL; 974 } 975 done: 976 if (nconf->nc_semantics != NC_TPI_CLTS) { 977 /* This client is the connectionless one */ 978 if (client) { 979 CLNT_DESTROY(client); 980 client = NULL; 981 } 982 } 983 if (clpp) { 984 *clpp = client; 985 } else if (client) { 986 CLNT_DESTROY(client); 987 } 988 return (address); 989 } 990 991 992 /* 993 * Find the mapped address for program, version. 994 * Calls the rpcbind service remotely to do the lookup. 995 * Uses the transport specified in nconf. 996 * Returns FALSE (0) if no map exists, else returns 1. 997 * 998 * Assuming that the address is all properly allocated 999 */ 1000 int 1001 rpcb_getaddr(program, version, nconf, address, host) 1002 rpcprog_t program; 1003 rpcvers_t version; 1004 const struct netconfig *nconf; 1005 struct netbuf *address; 1006 const char *host; 1007 { 1008 struct netbuf *na; 1009 1010 _DIAGASSERT(address != NULL); 1011 1012 if ((na = __rpcb_findaddr(program, version, nconf, 1013 host, (CLIENT **) NULL)) == NULL) 1014 return (FALSE); 1015 1016 if (na->len > address->maxlen) { 1017 /* Too long address */ 1018 free(na->buf); 1019 free(na); 1020 rpc_createerr.cf_stat = RPC_FAILED; 1021 return (FALSE); 1022 } 1023 memcpy(address->buf, na->buf, (size_t)na->len); 1024 address->len = na->len; 1025 free(na->buf); 1026 free(na); 1027 return (TRUE); 1028 } 1029 1030 /* 1031 * Get a copy of the current maps. 1032 * Calls the rpcbind service remotely to get the maps. 1033 * 1034 * It returns only a list of the services 1035 * It returns NULL on failure. 1036 */ 1037 rpcblist * 1038 rpcb_getmaps(nconf, host) 1039 const struct netconfig *nconf; 1040 const char *host; 1041 { 1042 rpcblist_ptr head = NULL; 1043 CLIENT *client; 1044 enum clnt_stat clnt_st; 1045 rpcvers_t vers = 0; 1046 1047 client = getclnthandle(host, nconf, NULL); 1048 if (client == NULL) { 1049 return (head); 1050 } 1051 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP, 1052 (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr, 1053 (char *)(void *)&head, tottimeout); 1054 if (clnt_st == RPC_SUCCESS) 1055 goto done; 1056 1057 if ((clnt_st != RPC_PROGVERSMISMATCH) && 1058 (clnt_st != RPC_PROGUNAVAIL)) { 1059 rpc_createerr.cf_stat = RPC_RPCBFAILURE; 1060 clnt_geterr(client, &rpc_createerr.cf_error); 1061 goto done; 1062 } 1063 1064 /* fall back to earlier version */ 1065 CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers); 1066 if (vers == RPCBVERS4) { 1067 vers = RPCBVERS; 1068 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 1069 if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP, 1070 (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr, 1071 (char *)(void *)&head, tottimeout) == RPC_SUCCESS) 1072 goto done; 1073 } 1074 rpc_createerr.cf_stat = RPC_RPCBFAILURE; 1075 clnt_geterr(client, &rpc_createerr.cf_error); 1076 1077 done: 1078 CLNT_DESTROY(client); 1079 return (head); 1080 } 1081 1082 /* 1083 * rpcbinder remote-call-service interface. 1084 * This routine is used to call the rpcbind remote call service 1085 * which will look up a service program in the address maps, and then 1086 * remotely call that routine with the given parameters. This allows 1087 * programs to do a lookup and call in one step. 1088 */ 1089 enum clnt_stat 1090 rpcb_rmtcall(nconf, host, prog, vers, proc, xdrargs, argsp, 1091 xdrres, resp, tout, addr_ptr) 1092 const struct netconfig *nconf; /* Netconfig structure */ 1093 const char *host; /* Remote host name */ 1094 rpcprog_t prog; 1095 rpcvers_t vers; 1096 rpcproc_t proc; /* Remote proc identifiers */ 1097 xdrproc_t xdrargs, xdrres; /* XDR routines */ 1098 caddr_t argsp, resp; /* Argument and Result */ 1099 struct timeval tout; /* Timeout value for this call */ 1100 const struct netbuf *addr_ptr; /* Preallocated netbuf address */ 1101 { 1102 CLIENT *client; 1103 enum clnt_stat stat; 1104 struct r_rpcb_rmtcallargs a; 1105 struct r_rpcb_rmtcallres r; 1106 rpcvers_t rpcb_vers; 1107 1108 client = getclnthandle(host, nconf, NULL); 1109 if (client == NULL) { 1110 return (RPC_FAILED); 1111 } 1112 /*LINTED const castaway*/ 1113 CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *)(void *)&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 /*LINTED const castaway*/ 1131 na = uaddr2taddr((struct netconfig *) nconf, r.addr); 1132 if (!na) { 1133 stat = RPC_N2AXLATEFAILURE; 1134 /*LINTED const castaway*/ 1135 ((struct netbuf *) addr_ptr)->len = 0; 1136 goto error; 1137 } 1138 if (na->len > addr_ptr->maxlen) { 1139 /* Too long address */ 1140 stat = RPC_FAILED; /* XXX A better error no */ 1141 free(na->buf); 1142 free(na); 1143 /*LINTED const castaway*/ 1144 ((struct netbuf *) addr_ptr)->len = 0; 1145 goto error; 1146 } 1147 memcpy(addr_ptr->buf, na->buf, (size_t)na->len); 1148 /*LINTED const castaway*/ 1149 ((struct netbuf *)addr_ptr)->len = na->len; 1150 free(na->buf); 1151 free(na); 1152 break; 1153 } else if ((stat != RPC_PROGVERSMISMATCH) && 1154 (stat != RPC_PROGUNAVAIL)) { 1155 goto error; 1156 } 1157 } 1158 error: 1159 CLNT_DESTROY(client); 1160 if (r.addr) 1161 xdr_free((xdrproc_t) xdr_wrapstring, (char *)(void *)&r.addr); 1162 return (stat); 1163 } 1164 1165 /* 1166 * Gets the time on the remote host. 1167 * Returns 1 if succeeds else 0. 1168 */ 1169 bool_t 1170 rpcb_gettime(host, timep) 1171 const char *host; 1172 time_t *timep; 1173 { 1174 CLIENT *client = NULL; 1175 void *handle; 1176 struct netconfig *nconf; 1177 rpcvers_t vers; 1178 enum clnt_stat st; 1179 1180 1181 if ((host == NULL) || (host[0] == NULL)) { 1182 time(timep); 1183 return (TRUE); 1184 } 1185 1186 if ((handle = __rpc_setconf("netpath")) == NULL) { 1187 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1188 return (FALSE); 1189 } 1190 rpc_createerr.cf_stat = RPC_SUCCESS; 1191 while (client == NULL) { 1192 if ((nconf = __rpc_getconf(handle)) == NULL) { 1193 if (rpc_createerr.cf_stat == RPC_SUCCESS) 1194 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1195 break; 1196 } 1197 client = getclnthandle(host, nconf, NULL); 1198 if (client) 1199 break; 1200 } 1201 __rpc_endconf(handle); 1202 if (client == (CLIENT *) NULL) { 1203 return (FALSE); 1204 } 1205 1206 st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME, 1207 (xdrproc_t) xdr_void, NULL, 1208 (xdrproc_t) xdr_int, (char *)(void *)timep, tottimeout); 1209 1210 if ((st == RPC_PROGVERSMISMATCH) || (st == RPC_PROGUNAVAIL)) { 1211 CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers); 1212 if (vers == RPCBVERS4) { 1213 /* fall back to earlier version */ 1214 vers = RPCBVERS; 1215 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 1216 st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME, 1217 (xdrproc_t) xdr_void, NULL, 1218 (xdrproc_t) xdr_int, (char *)(void *)timep, 1219 tottimeout); 1220 } 1221 } 1222 CLNT_DESTROY(client); 1223 return (st == RPC_SUCCESS? TRUE: FALSE); 1224 } 1225 1226 /* 1227 * Converts taddr to universal address. This routine should never 1228 * really be called because local n2a libraries are always provided. 1229 */ 1230 char * 1231 rpcb_taddr2uaddr(nconf, taddr) 1232 struct netconfig *nconf; 1233 struct netbuf *taddr; 1234 { 1235 CLIENT *client; 1236 char *uaddr = NULL; 1237 1238 1239 /* parameter checking */ 1240 if (nconf == NULL) { 1241 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1242 return (NULL); 1243 } 1244 if (taddr == NULL) { 1245 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 1246 return (NULL); 1247 } 1248 client = local_rpcb(); 1249 if (! client) { 1250 return (NULL); 1251 } 1252 1253 CLNT_CALL(client, (rpcproc_t)RPCBPROC_TADDR2UADDR, 1254 (xdrproc_t) xdr_netbuf, (char *)(void *)taddr, 1255 (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr, tottimeout); 1256 CLNT_DESTROY(client); 1257 return (uaddr); 1258 } 1259 1260 /* 1261 * Converts universal address to netbuf. This routine should never 1262 * really be called because local n2a libraries are always provided. 1263 */ 1264 struct netbuf * 1265 rpcb_uaddr2taddr(nconf, uaddr) 1266 struct netconfig *nconf; 1267 char *uaddr; 1268 { 1269 CLIENT *client; 1270 struct netbuf *taddr; 1271 1272 1273 /* parameter checking */ 1274 if (nconf == NULL) { 1275 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1276 return (NULL); 1277 } 1278 if (uaddr == NULL) { 1279 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 1280 return (NULL); 1281 } 1282 client = local_rpcb(); 1283 if (! client) { 1284 return (NULL); 1285 } 1286 1287 taddr = (struct netbuf *)calloc(1, sizeof (struct netbuf)); 1288 if (taddr == NULL) { 1289 CLNT_DESTROY(client); 1290 return (NULL); 1291 } 1292 if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_UADDR2TADDR, 1293 (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr, 1294 (xdrproc_t) xdr_netbuf, (char *)(void *)taddr, 1295 tottimeout) != RPC_SUCCESS) { 1296 free(taddr); 1297 taddr = NULL; 1298 } 1299 CLNT_DESTROY(client); 1300 return (taddr); 1301 } 1302