1 /* $NetBSD: rpcb_clnt.c,v 1.1 2000/06/02 23:11:14 fvdl 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 <netconfig.h> 60 #ifdef PORTMAP 61 #include <netinet/in.h> /* FOR IPPROTO_TCP/UDP definitions */ 62 #include <rpc/pmap_prot.h> 63 #endif 64 #include <stdio.h> 65 #include <errno.h> 66 #include <stdlib.h> 67 #include <string.h> 68 #include <unistd.h> 69 #include <netdb.h> 70 71 #include "rpc_com.h" 72 73 #ifdef __weak_alias 74 __weak_alias(rpcb_set,_rpcb_set) 75 __weak_alias(rpcb_unset,_rpcb_unset) 76 __weak_alias(rpcb_getmaps,_rpcb_getmaps) 77 __weak_alias(rpcb_rmtcall,_rpcb_rmtcall) 78 __weak_alias(rpcb_gettime,_rpcb_gettime) 79 __weak_alias(rpcb_taddr2uaddr,_rpcb_taddr2uaddr) 80 __weak_alias(rpcb_uaddr2taddr,_rpcb_uaddr2taddr) 81 #endif 82 83 static struct timeval tottimeout = { 60, 0 }; 84 static const struct timeval rmttimeout = { 3, 0 }; 85 86 extern bool_t xdr_wrapstring __P((XDR *, char **)); 87 88 static const char nullstring[] = "\000"; 89 90 #define CACHESIZE 6 91 92 struct address_cache { 93 char *ac_host; 94 char *ac_netid; 95 char *ac_uaddr; 96 struct netbuf *ac_taddr; 97 struct address_cache *ac_next; 98 }; 99 100 static struct address_cache *front; 101 static int cachesize; 102 103 #define CLCR_GET_RPCB_TIMEOUT 1 104 #define CLCR_SET_RPCB_TIMEOUT 2 105 106 107 extern int __rpc_lowvers; 108 109 static struct address_cache *check_cache __P((const char *, const char *)); 110 static void delete_cache __P((struct netbuf *)); 111 static void add_cache __P((const char *, const char *, struct netbuf *, 112 char *)); 113 static CLIENT *getclnthandle __P((const char *, const struct netconfig *, 114 char **)); 115 static CLIENT *local_rpcb __P((void)); 116 static struct netbuf *got_entry __P((rpcb_entry_list_ptr, 117 const struct netconfig *)); 118 119 /* 120 * This routine adjusts the timeout used for calls to the remote rpcbind. 121 * Also, this routine can be used to set the use of portmapper version 2 122 * only when doing rpc_broadcasts 123 * These are private routines that may not be provided in future releases. 124 */ 125 bool_t 126 __rpc_control(request, info) 127 int request; 128 void *info; 129 { 130 switch (request) { 131 case CLCR_GET_RPCB_TIMEOUT: 132 *(struct timeval *)info = tottimeout; 133 break; 134 case CLCR_SET_RPCB_TIMEOUT: 135 tottimeout = *(struct timeval *)info; 136 break; 137 case CLCR_SET_LOWVERS: 138 __rpc_lowvers = *(int *)info; 139 break; 140 case CLCR_GET_LOWVERS: 141 *(int *)info = __rpc_lowvers; 142 break; 143 default: 144 return (FALSE); 145 } 146 return (TRUE); 147 } 148 149 /* 150 * It might seem that a reader/writer lock would be more reasonable here. 151 * However because getclnthandle(), the only user of the cache functions, 152 * may do a delete_cache() operation if a check_cache() fails to return an 153 * address useful to clnt_tli_create(), we may as well use a mutex. 154 */ 155 /* 156 * As it turns out, if the cache lock is *not* a reader/writer lock, we will 157 * block all clnt_create's if we are trying to connect to a host that's down, 158 * since the lock will be held all during that time. 159 */ 160 #ifdef __REENT 161 extern rwlock_t rpcbaddr_cache_lock; 162 #endif 163 164 /* 165 * The routines check_cache(), add_cache(), delete_cache() manage the 166 * cache of rpcbind addresses for (host, netid). 167 */ 168 169 static struct address_cache * 170 check_cache(host, netid) 171 const char *host, *netid; 172 { 173 struct address_cache *cptr; 174 175 /* READ LOCK HELD ON ENTRY: rpcbaddr_cache_lock */ 176 177 for (cptr = front; cptr != NULL; cptr = cptr->ac_next) { 178 if (!strcmp(cptr->ac_host, host) && 179 !strcmp(cptr->ac_netid, netid)) { 180 #ifdef ND_DEBUG 181 fprintf(stderr, "Found cache entry for %s: %s\n", 182 host, netid); 183 #endif 184 return (cptr); 185 } 186 } 187 return ((struct address_cache *) NULL); 188 } 189 190 static void 191 delete_cache(addr) 192 struct netbuf *addr; 193 { 194 struct address_cache *cptr, *prevptr = NULL; 195 196 /* WRITE LOCK HELD ON ENTRY: rpcbaddr_cache_lock */ 197 for (cptr = front; cptr != NULL; cptr = cptr->ac_next) { 198 if (!memcmp(cptr->ac_taddr->buf, addr->buf, addr->len)) { 199 free(cptr->ac_host); 200 free(cptr->ac_netid); 201 free(cptr->ac_taddr->buf); 202 free(cptr->ac_taddr); 203 if (cptr->ac_uaddr) 204 free(cptr->ac_uaddr); 205 if (prevptr) 206 prevptr->ac_next = cptr->ac_next; 207 else 208 front = cptr->ac_next; 209 free(cptr); 210 cachesize--; 211 break; 212 } 213 prevptr = cptr; 214 } 215 } 216 217 static void 218 add_cache(host, netid, taddr, uaddr) 219 const char *host, *netid; 220 char *uaddr; 221 struct netbuf *taddr; 222 { 223 struct address_cache *ad_cache, *cptr, *prevptr; 224 225 ad_cache = (struct address_cache *) 226 malloc(sizeof (struct address_cache)); 227 if (!ad_cache) { 228 return; 229 } 230 ad_cache->ac_host = strdup(host); 231 ad_cache->ac_netid = strdup(netid); 232 ad_cache->ac_uaddr = uaddr ? strdup(uaddr) : NULL; 233 ad_cache->ac_taddr = (struct netbuf *)malloc(sizeof (struct netbuf)); 234 if (!ad_cache->ac_host || !ad_cache->ac_netid || !ad_cache->ac_taddr || 235 (uaddr && !ad_cache->ac_uaddr)) { 236 return; 237 } 238 ad_cache->ac_taddr->len = ad_cache->ac_taddr->maxlen = taddr->len; 239 ad_cache->ac_taddr->buf = (char *) malloc(taddr->len); 240 if (ad_cache->ac_taddr->buf == NULL) { 241 return; 242 } 243 memcpy(ad_cache->ac_taddr->buf, taddr->buf, taddr->len); 244 #ifdef ND_DEBUG 245 fprintf(stderr, "Added to cache: %s : %s\n", host, netid); 246 #endif 247 248 /* VARIABLES PROTECTED BY rpcbaddr_cache_lock: cptr */ 249 250 rwlock_wrlock(&rpcbaddr_cache_lock); 251 if (cachesize < CACHESIZE) { 252 ad_cache->ac_next = front; 253 front = ad_cache; 254 cachesize++; 255 } else { 256 /* Free the last entry */ 257 cptr = front; 258 prevptr = NULL; 259 while (cptr->ac_next) { 260 prevptr = cptr; 261 cptr = cptr->ac_next; 262 } 263 264 #ifdef ND_DEBUG 265 fprintf(stderr, "Deleted from cache: %s : %s\n", 266 cptr->ac_host, cptr->ac_netid); 267 #endif 268 free(cptr->ac_host); 269 free(cptr->ac_netid); 270 free(cptr->ac_taddr->buf); 271 free(cptr->ac_taddr); 272 if (cptr->ac_uaddr) 273 free(cptr->ac_uaddr); 274 275 if (prevptr) { 276 prevptr->ac_next = NULL; 277 ad_cache->ac_next = front; 278 front = ad_cache; 279 } else { 280 front = ad_cache; 281 ad_cache->ac_next = NULL; 282 } 283 free(cptr); 284 } 285 rwlock_unlock(&rpcbaddr_cache_lock); 286 } 287 288 /* 289 * This routine will return a client handle that is connected to the 290 * rpcbind. Returns NULL on error and free's everything. 291 */ 292 static CLIENT * 293 getclnthandle(host, nconf, targaddr) 294 const char *host; 295 const struct netconfig *nconf; 296 char **targaddr; 297 { 298 register CLIENT *client; 299 struct netbuf *addr, taddr; 300 struct netbuf addr_to_delete; 301 struct __rpc_sockinfo si; 302 struct addrinfo hints, *res, *tres; 303 struct address_cache *ad_cache; 304 char *tmpaddr; 305 306 /* VARIABLES PROTECTED BY rpcbaddr_cache_lock: ad_cache */ 307 308 /* Get the address of the rpcbind. Check cache first */ 309 addr_to_delete.len = 0; 310 rwlock_rdlock(&rpcbaddr_cache_lock); 311 ad_cache = check_cache(host, nconf->nc_netid); 312 if (ad_cache != NULL) { 313 addr = ad_cache->ac_taddr; 314 client = clnt_tli_create(RPC_ANYFD, nconf, addr, RPCBPROG, 315 RPCBVERS4, 0, 0); 316 if (client != NULL) { 317 if (targaddr) 318 *targaddr = ad_cache->ac_uaddr; 319 rwlock_unlock(&rpcbaddr_cache_lock); 320 return (client); 321 } 322 addr_to_delete.len = addr->len; 323 addr_to_delete.buf = (char *)malloc(addr->len); 324 if (addr_to_delete.buf == NULL) { 325 addr_to_delete.len = 0; 326 } else { 327 memcpy(addr_to_delete.buf, addr->buf, addr->len); 328 } 329 } 330 rwlock_unlock(&rpcbaddr_cache_lock); 331 if (addr_to_delete.len != 0) { 332 /* 333 * Assume this may be due to cache data being 334 * outdated 335 */ 336 rwlock_wrlock(&rpcbaddr_cache_lock); 337 delete_cache(&addr_to_delete); 338 rwlock_unlock(&rpcbaddr_cache_lock); 339 free(addr_to_delete.buf); 340 } 341 if (!__rpc_nconf2sockinfo(nconf, &si)) 342 return NULL; 343 344 memset(&hints, 0, sizeof hints); 345 hints.ai_family = si.si_af; 346 hints.ai_socktype = si.si_socktype; 347 hints.ai_protocol = si.si_proto; 348 349 #ifdef CLNT_DEBUG 350 printf("trying netid %s family %d proto %d socktype %d\n", 351 nconf->nc_netid, si.si_af, si.si_proto, si.si_socktype); 352 #endif 353 354 if (getaddrinfo(host, "sunrpc", &hints, &res) != 0) 355 return NULL; 356 357 for (tres = res; tres != NULL; tres = tres->ai_next) { 358 taddr.buf = tres->ai_addr; 359 taddr.len = taddr.maxlen = tres->ai_addrlen; 360 361 #ifdef ND_DEBUG 362 { 363 char *ua; 364 365 ua = taddr2uaddr(nconf, &taddr); 366 fprintf(stderr, "Got it [%s]\n", ua); 367 free(ua); 368 } 369 #endif 370 371 #ifdef ND_DEBUG 372 { 373 int i; 374 375 fprintf(stderr, "\tnetbuf len = %d, maxlen = %d\n", 376 taddr.len, taddr.maxlen); 377 fprintf(stderr, "\tAddress is "); 378 for (i = 0; i < taddr.len; i++) 379 fprintf(stderr, "%u.", taddr.buf[i]); 380 fprintf(stderr, "\n"); 381 } 382 #endif 383 client = clnt_tli_create(RPC_ANYFD, nconf, &taddr, RPCBPROG, 384 RPCBVERS4, 0, 0); 385 #ifdef ND_DEBUG 386 if (! client) { 387 clnt_pcreateerror("rpcbind clnt interface"); 388 } 389 #endif 390 391 if (client) { 392 tmpaddr = targaddr ? taddr2uaddr(nconf, &taddr) : NULL; 393 add_cache(host, nconf->nc_netid, &taddr, tmpaddr); 394 if (targaddr) 395 *targaddr = tmpaddr; 396 break; 397 } 398 } 399 freeaddrinfo(res); 400 return (client); 401 } 402 403 /* XXX */ 404 #define IN4_LOCALHOST_STRING "127.0.0.1" 405 #define IN6_LOCALHOST_STRING "::1" 406 407 /* 408 * This routine will return a client handle that is connected to the local 409 * rpcbind. Returns NULL on error and free's everything. 410 */ 411 static CLIENT * 412 local_rpcb() 413 { 414 CLIENT *client; 415 static struct netconfig *loopnconf; 416 static char *hostname; 417 #ifdef __REENT 418 extern mutex_t loopnconf_lock; 419 #endif 420 int sock, tsize; 421 struct netbuf nbuf; 422 struct sockaddr_un sun; 423 424 /* 425 * Try connecting to the local rpcbind through a local socket 426 * first. If this doesn't work, try all transports defined in 427 * the netconfig file. 428 */ 429 memset(&sun, 0, sizeof sun); 430 sock = socket(AF_LOCAL, SOCK_STREAM, 0); 431 if (sock < 0) 432 goto try_nconf; 433 sun.sun_family = AF_LOCAL; 434 strcpy(sun.sun_path, _PATH_RPCBINDSOCK); 435 nbuf.len = sun.sun_len = SUN_LEN(&sun); 436 nbuf.maxlen = sizeof (struct sockaddr_un); 437 nbuf.buf = &sun; 438 439 tsize = __rpc_get_t_size(AF_LOCAL, 0, 0); 440 client = clnt_vc_create(sock, &nbuf, RPCBPROG, RPCBVERS, tsize, tsize); 441 442 if (client != NULL) 443 return client; 444 445 try_nconf: 446 447 /* VARIABLES PROTECTED BY loopnconf_lock: loopnconf */ 448 mutex_lock(&loopnconf_lock); 449 if (loopnconf == NULL) { 450 struct netconfig *nconf, *tmpnconf = NULL; 451 void *nc_handle; 452 int fd; 453 454 nc_handle = setnetconfig(); 455 if (nc_handle == NULL) { 456 /* fails to open netconfig file */ 457 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 458 mutex_unlock(&loopnconf_lock); 459 return (NULL); 460 } 461 while ((nconf = getnetconfig(nc_handle))) { 462 #ifdef INET6 463 if ((strcmp(nconf->nc_protofmly, NC_INET6) == 0 || 464 #else 465 if ( 466 #endif 467 strcmp(nconf->nc_protofmly, NC_INET) == 0) && 468 (nconf->nc_semantics == NC_TPI_COTS || 469 nconf->nc_semantics == NC_TPI_COTS_ORD)) { 470 fd = __rpc_nconf2fd(nconf); 471 /* 472 * Can't create a socket, assume that 473 * this family isn't configured in the kernel. 474 */ 475 if (fd < 0) 476 continue; 477 close(fd); 478 tmpnconf = nconf; 479 if (!strcmp(nconf->nc_protofmly, NC_INET)) 480 hostname = IN4_LOCALHOST_STRING; 481 else 482 hostname = IN6_LOCALHOST_STRING; 483 } 484 } 485 if (tmpnconf == NULL) { 486 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 487 mutex_unlock(&loopnconf_lock); 488 return (NULL); 489 } 490 loopnconf = getnetconfigent(tmpnconf->nc_netid); 491 /* loopnconf is never freed */ 492 endnetconfig(nc_handle); 493 } 494 mutex_unlock(&loopnconf_lock); 495 client = getclnthandle(hostname, loopnconf, (char **)NULL); 496 return (client); 497 } 498 499 /* 500 * Set a mapping between program, version and address. 501 * Calls the rpcbind service to do the mapping. 502 */ 503 bool_t 504 rpcb_set(program, version, nconf, address) 505 rpcprog_t program; 506 rpcvers_t version; 507 const struct netconfig *nconf; /* Network structure of transport */ 508 const struct netbuf *address; /* Services netconfig address */ 509 { 510 register CLIENT *client; 511 bool_t rslt = FALSE; 512 RPCB parms; 513 char uidbuf[32]; 514 515 /* parameter checking */ 516 if (nconf == (struct netconfig *)NULL) { 517 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 518 return (FALSE); 519 } 520 if (address == NULL) { 521 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 522 return (FALSE); 523 } 524 client = local_rpcb(); 525 if (! client) { 526 return (FALSE); 527 } 528 529 /* convert to universal */ 530 parms.r_addr = taddr2uaddr((struct netconfig *) nconf, 531 (struct netbuf *)address); 532 if (!parms.r_addr) { 533 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE; 534 return (FALSE); /* no universal address */ 535 } 536 parms.r_prog = program; 537 parms.r_vers = version; 538 parms.r_netid = nconf->nc_netid; 539 /* 540 * Though uid is not being used directly, we still send it for 541 * completeness. For non-unix platforms, perhaps some other 542 * string or an empty string can be sent. 543 */ 544 (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid()); 545 parms.r_owner = uidbuf; 546 547 CLNT_CALL(client, RPCBPROC_SET, (xdrproc_t) xdr_rpcb, (char *)&parms, 548 (xdrproc_t) xdr_bool, (char *)&rslt, tottimeout); 549 550 CLNT_DESTROY(client); 551 free(parms.r_addr); 552 return (rslt); 553 } 554 555 /* 556 * Remove the mapping between program, version and netbuf address. 557 * Calls the rpcbind service to do the un-mapping. 558 * If netbuf is NULL, unset for all the transports, otherwise unset 559 * only for the given transport. 560 */ 561 bool_t 562 rpcb_unset(program, version, nconf) 563 rpcprog_t program; 564 rpcvers_t version; 565 const struct netconfig *nconf; 566 { 567 register CLIENT *client; 568 bool_t rslt = FALSE; 569 RPCB parms; 570 char uidbuf[32]; 571 572 client = local_rpcb(); 573 if (! client) { 574 return (FALSE); 575 } 576 577 parms.r_prog = program; 578 parms.r_vers = version; 579 if (nconf) 580 parms.r_netid = nconf->nc_netid; 581 else 582 parms.r_netid = (char *) &nullstring[0]; /* unsets all */ 583 parms.r_addr = (char *) &nullstring[0]; 584 (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid()); 585 parms.r_owner = uidbuf; 586 587 CLNT_CALL(client, RPCBPROC_UNSET, (xdrproc_t) xdr_rpcb, (char *)&parms, 588 (xdrproc_t) xdr_bool, (char *)&rslt, tottimeout); 589 590 CLNT_DESTROY(client); 591 return (rslt); 592 } 593 594 /* 595 * From the merged list, find the appropriate entry 596 */ 597 static struct netbuf * 598 got_entry(relp, nconf) 599 rpcb_entry_list_ptr relp; 600 const struct netconfig *nconf; 601 { 602 struct netbuf *na = NULL; 603 rpcb_entry_list_ptr sp; 604 rpcb_entry *rmap; 605 606 for (sp = relp; sp != NULL; sp = sp->rpcb_entry_next) { 607 rmap = &sp->rpcb_entry_map; 608 if ((strcmp(nconf->nc_proto, rmap->r_nc_proto) == 0) && 609 (strcmp(nconf->nc_protofmly, rmap->r_nc_protofmly) == 0) && 610 (nconf->nc_semantics == rmap->r_nc_semantics) && 611 (rmap->r_maddr != NULL) && (rmap->r_maddr[0] != NULL)) { 612 na = uaddr2taddr(nconf, rmap->r_maddr); 613 #ifdef ND_DEBUG 614 fprintf(stderr, "\tRemote address is [%s].\n", 615 rmap->r_maddr); 616 if (!na) 617 fprintf(stderr, 618 "\tCouldn't resolve remote address!\n"); 619 #endif 620 break; 621 } 622 } 623 return (na); 624 } 625 626 /* 627 * An internal function which optimizes rpcb_getaddr function. It also 628 * returns the client handle that it uses to contact the remote rpcbind. 629 * 630 * The algorithm used: If the transports is TCP or UDP, it first tries 631 * version 2 (portmap), 4 and then 3 (svr4). This order should be 632 * changed in the next OS release to 4, 2 and 3. We are assuming that by 633 * that time, version 4 would be available on many machines on the network. 634 * With this algorithm, we get performance as well as a plan for 635 * obsoleting version 2. 636 * 637 * For all other transports, the algorithm remains as 4 and then 3. 638 * 639 * XXX: Due to some problems with t_connect(), we do not reuse the same client 640 * handle for COTS cases and hence in these cases we do not return the 641 * client handle. This code will change if t_connect() ever 642 * starts working properly. Also look under clnt_vc.c. 643 */ 644 struct netbuf * 645 __rpcb_findaddr(program, version, nconf, host, clpp) 646 rpcprog_t program; 647 rpcvers_t version; 648 const struct netconfig *nconf; 649 const char *host; 650 CLIENT **clpp; 651 { 652 register CLIENT *client = NULL; 653 RPCB parms; 654 enum clnt_stat clnt_st; 655 char *ua = NULL; 656 rpcvers_t vers; 657 struct netbuf *address = NULL; 658 rpcvers_t start_vers = RPCBVERS4; 659 struct netbuf servaddr; 660 661 /* parameter checking */ 662 if (nconf == (struct netconfig *)NULL) { 663 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 664 return (NULL); 665 } 666 667 parms.r_addr = NULL; 668 669 #ifdef PORTMAP 670 /* Try version 2 for TCP or UDP */ 671 if (strcmp(nconf->nc_protofmly, NC_INET) == 0) { 672 u_short port = 0; 673 struct netbuf remote; 674 u_long pmapvers = 2; 675 struct pmap pmapparms; 676 677 /* 678 * Try UDP only - there are some portmappers out 679 * there that use UDP only. 680 */ 681 if (strcmp(nconf->nc_proto, NC_TCP) == 0) { 682 struct netconfig *newnconf; 683 void *handle; 684 685 if ((handle = __rpc_setconf("udp")) == NULL) { 686 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 687 return (NULL); 688 } 689 if ((newnconf = __rpc_getconf(handle)) == NULL) { 690 __rpc_endconf(handle); 691 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 692 return (NULL); 693 } 694 client = getclnthandle(host, newnconf, &parms.r_addr); 695 __rpc_endconf(handle); 696 } else { 697 client = getclnthandle(host, nconf, &parms.r_addr); 698 } 699 if (client == (CLIENT *)NULL) { 700 return (NULL); 701 } 702 703 /* Set the version */ 704 CLNT_CONTROL(client, CLSET_VERS, (char *)&pmapvers); 705 pmapparms.pm_prog = program; 706 pmapparms.pm_vers = version; 707 pmapparms.pm_prot = strcmp(nconf->nc_proto, NC_TCP) ? 708 IPPROTO_UDP : IPPROTO_TCP; 709 pmapparms.pm_port = 0; /* not needed */ 710 clnt_st = CLNT_CALL(client, PMAPPROC_GETPORT, 711 (xdrproc_t) xdr_pmap, (caddr_t) &pmapparms, 712 (xdrproc_t) xdr_u_short, (caddr_t) &port, 713 tottimeout); 714 if (clnt_st != RPC_SUCCESS) { 715 if ((clnt_st == RPC_PROGVERSMISMATCH) || 716 (clnt_st == RPC_PROGUNAVAIL)) 717 goto try_rpcbind; /* Try different versions */ 718 rpc_createerr.cf_stat = RPC_PMAPFAILURE; 719 clnt_geterr(client, &rpc_createerr.cf_error); 720 goto error; 721 } else if (port == 0) { 722 address = NULL; 723 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 724 goto error; 725 } 726 port = htons(port); 727 CLNT_CONTROL(client, CLGET_SVC_ADDR, (char *)&remote); 728 if (((address = (struct netbuf *) 729 malloc(sizeof (struct netbuf))) == NULL) || 730 ((address->buf = (char *) 731 malloc(remote.len)) == NULL)) { 732 rpc_createerr.cf_stat = RPC_SYSTEMERROR; 733 clnt_geterr(client, &rpc_createerr.cf_error); 734 if (address) { 735 free(address); 736 address = NULL; 737 } 738 goto error; 739 } 740 memcpy(address->buf, remote.buf, remote.len); 741 memcpy(&((char *)address->buf)[sizeof (short)], 742 (char *)&port, sizeof (short)); 743 address->len = address->maxlen = remote.len; 744 goto done; 745 } 746 #endif 747 748 try_rpcbind: 749 /* 750 * Now we try version 4 and then 3. 751 * We also send the remote system the address we used to 752 * contact it in case it can help to connect back with us 753 */ 754 parms.r_prog = program; 755 parms.r_vers = version; 756 parms.r_owner = (char *) &nullstring[0]; /* not needed; */ 757 /* just for xdring */ 758 parms.r_netid = nconf->nc_netid; /* not really needed */ 759 760 /* 761 * If a COTS transport is being used, try getting address via CLTS 762 * transport. This works only with version 4. 763 * NOTE: This is being done for all transports EXCEPT LOOPBACK 764 * because with loopback the cost to go to a COTS is same as 765 * the cost to go through CLTS, plus you get the advantage of 766 * finding out immediately if the local rpcbind process is dead. 767 */ 768 #if 1 769 if ((nconf->nc_semantics == NC_TPI_COTS_ORD || 770 nconf->nc_semantics == NC_TPI_COTS) && 771 (strcmp(nconf->nc_protofmly, NC_LOOPBACK) != 0)) { 772 #else 773 if (client != NULL) { 774 CLNT_DESTROY(client); 775 client = NULL; 776 } 777 if (nconf->nc_semantics == NC_TPI_CLTS) { 778 #endif 779 void *handle; 780 struct netconfig *nconf_clts; 781 rpcb_entry_list_ptr relp = NULL; 782 783 if (client == NULL) { 784 /* This did not go through the above PORTMAP/TCP code */ 785 #if 1 786 if ((handle = __rpc_setconf("datagram_v")) != NULL) { 787 #else 788 if ((handle = __rpc_setconf("circuit_v")) != NULL) { 789 #endif 790 while ((nconf_clts = __rpc_getconf(handle)) 791 != NULL) { 792 if (strcmp(nconf_clts->nc_protofmly, 793 nconf->nc_protofmly) != 0) { 794 continue; 795 } 796 client = getclnthandle(host, nconf_clts, 797 &parms.r_addr); 798 break; 799 } 800 __rpc_endconf(handle); 801 } 802 if (client == (CLIENT *)NULL) 803 goto regular_rpcbind; /* Go the regular way */ 804 } else { 805 /* This is a UDP PORTMAP handle. Change to version 4 */ 806 vers = RPCBVERS4; 807 CLNT_CONTROL(client, CLSET_VERS, (char *)&vers); 808 } 809 /* 810 * We also send the remote system the address we used to 811 * contact it in case it can help it connect back with us 812 */ 813 if (parms.r_addr == NULL) 814 parms.r_addr = (char *) &nullstring[0]; /* for XDRing */ 815 clnt_st = CLNT_CALL(client, RPCBPROC_GETADDRLIST, 816 (xdrproc_t) xdr_rpcb, (char *) &parms, 817 (xdrproc_t) xdr_rpcb_entry_list_ptr, 818 (char *) &relp, tottimeout); 819 if (clnt_st == RPC_SUCCESS) { 820 if ((address = got_entry(relp, nconf))) { 821 xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr, 822 (char *)&relp); 823 goto done; 824 } 825 /* Entry not found for this transport */ 826 xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr, 827 (char *)&relp); 828 /* 829 * XXX: should have perhaps returned with error but 830 * since the remote machine might not always be able 831 * to send the address on all transports, we try the 832 * regular way with regular_rpcbind 833 */ 834 goto regular_rpcbind; 835 } else if ((clnt_st == RPC_PROGVERSMISMATCH) || 836 (clnt_st == RPC_PROGUNAVAIL)) { 837 start_vers = RPCBVERS; /* Try version 3 now */ 838 goto regular_rpcbind; /* Try different versions */ 839 } else { 840 rpc_createerr.cf_stat = RPC_PMAPFAILURE; 841 clnt_geterr(client, &rpc_createerr.cf_error); 842 goto error; 843 } 844 } 845 846 regular_rpcbind: 847 848 /* Now the same transport is to be used to get the address */ 849 #if 1 850 if (client && ((nconf->nc_semantics == NC_TPI_COTS_ORD) || 851 (nconf->nc_semantics == NC_TPI_COTS))) { 852 #else 853 if (client && nconf->nc_semantics == NC_TPI_CLTS) { 854 #endif 855 /* A CLTS type of client - destroy it */ 856 CLNT_DESTROY(client); 857 client = NULL; 858 } 859 860 if (client == NULL) { 861 client = getclnthandle(host, nconf, &parms.r_addr); 862 if (client == NULL) { 863 goto error; 864 } 865 } 866 if (parms.r_addr == NULL) 867 parms.r_addr = (char *) &nullstring[0]; 868 869 /* First try from start_vers and then version 3 (RPCBVERS) */ 870 for (vers = start_vers; vers >= RPCBVERS; vers--) { 871 /* Set the version */ 872 CLNT_CONTROL(client, CLSET_VERS, (char *)&vers); 873 clnt_st = CLNT_CALL(client, RPCBPROC_GETADDR, 874 (xdrproc_t) xdr_rpcb, (char *) &parms, 875 (xdrproc_t) xdr_wrapstring, 876 (char *) &ua, tottimeout); 877 if (clnt_st == RPC_SUCCESS) { 878 if ((ua == NULL) || (ua[0] == NULL)) { 879 /* address unknown */ 880 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 881 goto error; 882 } 883 address = uaddr2taddr(nconf, ua); 884 #ifdef ND_DEBUG 885 fprintf(stderr, "\tRemote address is [%s]\n", ua); 886 if (!address) 887 fprintf(stderr, 888 "\tCouldn't resolve remote address!\n"); 889 #endif 890 xdr_free((xdrproc_t)xdr_wrapstring, (char *)&ua); 891 892 if (! address) { 893 /* We don't know about your universal address */ 894 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE; 895 goto error; 896 } 897 CLNT_CONTROL(client, CLGET_SVC_ADDR, (char *)&servaddr); 898 __rpc_fixup_addr(address, &servaddr); 899 goto done; 900 } else if (clnt_st == RPC_PROGVERSMISMATCH) { 901 struct rpc_err rpcerr; 902 903 clnt_geterr(client, &rpcerr); 904 if (rpcerr.re_vers.low > RPCBVERS4) 905 goto error; /* a new version, can't handle */ 906 } else if (clnt_st != RPC_PROGUNAVAIL) { 907 /* Cant handle this error */ 908 rpc_createerr.cf_stat = clnt_st; 909 clnt_geterr(client, &rpc_createerr.cf_error); 910 goto error; 911 } 912 } 913 914 if ((address == NULL) || (address->len == 0)) { 915 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 916 clnt_geterr(client, &rpc_createerr.cf_error); 917 } 918 919 error: 920 if (client) { 921 CLNT_DESTROY(client); 922 client = NULL; 923 } 924 done: 925 if (nconf->nc_semantics != NC_TPI_CLTS) { 926 /* This client is the connectionless one */ 927 if (client) { 928 CLNT_DESTROY(client); 929 client = NULL; 930 } 931 } 932 if (clpp) { 933 *clpp = client; 934 } else if (client) { 935 CLNT_DESTROY(client); 936 } 937 return (address); 938 } 939 940 941 /* 942 * Find the mapped address for program, version. 943 * Calls the rpcbind service remotely to do the lookup. 944 * Uses the transport specified in nconf. 945 * Returns FALSE (0) if no map exists, else returns 1. 946 * 947 * Assuming that the address is all properly allocated 948 */ 949 int 950 rpcb_getaddr(program, version, nconf, address, host) 951 rpcprog_t program; 952 rpcvers_t version; 953 const struct netconfig *nconf; 954 struct netbuf *address; 955 const char *host; 956 { 957 struct netbuf *na; 958 959 if ((na = __rpcb_findaddr(program, version, nconf, 960 host, (CLIENT **) NULL)) == NULL) 961 return (FALSE); 962 963 if (na->len > address->maxlen) { 964 /* Too long address */ 965 free(na->buf); 966 free(na); 967 rpc_createerr.cf_stat = RPC_FAILED; 968 return (FALSE); 969 } 970 memcpy(address->buf, na->buf, (int)na->len); 971 address->len = na->len; 972 free(na->buf); 973 free(na); 974 return (TRUE); 975 } 976 977 /* 978 * Get a copy of the current maps. 979 * Calls the rpcbind service remotely to get the maps. 980 * 981 * It returns only a list of the services 982 * It returns NULL on failure. 983 */ 984 rpcblist * 985 rpcb_getmaps(nconf, host) 986 const struct netconfig *nconf; 987 const char *host; 988 { 989 rpcblist_ptr head = (rpcblist_ptr)NULL; 990 register CLIENT *client; 991 enum clnt_stat clnt_st; 992 long vers = 0; 993 994 client = getclnthandle(host, nconf, (char **)NULL); 995 if (client == (CLIENT *)NULL) { 996 return (head); 997 } 998 clnt_st = CLNT_CALL(client, RPCBPROC_DUMP, 999 (xdrproc_t) xdr_void, NULL, 1000 (xdrproc_t) xdr_rpcblist_ptr, 1001 (char *)&head, tottimeout); 1002 if (clnt_st == RPC_SUCCESS) 1003 goto done; 1004 1005 if ((clnt_st != RPC_PROGVERSMISMATCH) && 1006 (clnt_st != RPC_PROGUNAVAIL)) { 1007 rpc_createerr.cf_stat = RPC_RPCBFAILURE; 1008 clnt_geterr(client, &rpc_createerr.cf_error); 1009 goto done; 1010 } 1011 1012 /* fall back to earlier version */ 1013 CLNT_CONTROL(client, CLGET_VERS, (char *)&vers); 1014 if (vers == RPCBVERS4) { 1015 vers = RPCBVERS; 1016 CLNT_CONTROL(client, CLSET_VERS, (char *)&vers); 1017 if (CLNT_CALL(client, RPCBPROC_DUMP, 1018 (xdrproc_t) xdr_void, 1019 (char *) NULL, (xdrproc_t) xdr_rpcblist_ptr, 1020 (char *)&head, tottimeout) == RPC_SUCCESS) 1021 goto done; 1022 } 1023 rpc_createerr.cf_stat = RPC_RPCBFAILURE; 1024 clnt_geterr(client, &rpc_createerr.cf_error); 1025 1026 done: 1027 CLNT_DESTROY(client); 1028 return (head); 1029 } 1030 1031 /* 1032 * rpcbinder remote-call-service interface. 1033 * This routine is used to call the rpcbind remote call service 1034 * which will look up a service program in the address maps, and then 1035 * remotely call that routine with the given parameters. This allows 1036 * programs to do a lookup and call in one step. 1037 */ 1038 enum clnt_stat 1039 rpcb_rmtcall(nconf, host, prog, vers, proc, xdrargs, argsp, 1040 xdrres, resp, tout, addr_ptr) 1041 const struct netconfig *nconf; /* Netconfig structure */ 1042 const char *host; /* Remote host name */ 1043 rpcprog_t prog; 1044 rpcvers_t vers; 1045 rpcproc_t proc; /* Remote proc identifiers */ 1046 xdrproc_t xdrargs, xdrres; /* XDR routines */ 1047 caddr_t argsp, resp; /* Argument and Result */ 1048 struct timeval tout; /* Timeout value for this call */ 1049 const struct netbuf *addr_ptr; /* Preallocated netbuf address */ 1050 { 1051 register CLIENT *client; 1052 enum clnt_stat stat; 1053 struct r_rpcb_rmtcallargs a; 1054 struct r_rpcb_rmtcallres r; 1055 long rpcb_vers; 1056 1057 1058 client = getclnthandle(host, nconf, (char **)NULL); 1059 if (client == (CLIENT *)NULL) { 1060 return (RPC_FAILED); 1061 } 1062 CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *)&rmttimeout); 1063 a.prog = prog; 1064 a.vers = vers; 1065 a.proc = proc; 1066 a.args.args_val = argsp; 1067 a.xdr_args = xdrargs; 1068 r.addr = NULL; 1069 r.results.results_val = resp; 1070 r.xdr_res = xdrres; 1071 1072 for (rpcb_vers = RPCBVERS4; rpcb_vers >= RPCBVERS; rpcb_vers--) { 1073 CLNT_CONTROL(client, CLSET_VERS, (char *)&rpcb_vers); 1074 stat = CLNT_CALL(client, RPCBPROC_CALLIT, 1075 (xdrproc_t) xdr_rpcb_rmtcallargs, (char *)&a, 1076 (xdrproc_t) xdr_rpcb_rmtcallres, (char *)&r, tout); 1077 if ((stat == RPC_SUCCESS) && (addr_ptr != NULL)) { 1078 struct netbuf *na; 1079 1080 na = uaddr2taddr((struct netconfig *) nconf, r.addr); 1081 if (! na) { 1082 stat = RPC_N2AXLATEFAILURE; 1083 ((struct netbuf *) addr_ptr)->len = 0; 1084 goto error; 1085 } 1086 if (na->len > addr_ptr->maxlen) { 1087 /* Too long address */ 1088 stat = RPC_FAILED; /* XXX A better error no */ 1089 free(na->buf); 1090 free(na); 1091 ((struct netbuf *) addr_ptr)->len = 0; 1092 goto error; 1093 } 1094 memcpy(addr_ptr->buf, na->buf, (int)na->len); 1095 ((struct netbuf *)addr_ptr)->len = na->len; 1096 free(na->buf); 1097 free(na); 1098 break; 1099 } else if ((stat != RPC_PROGVERSMISMATCH) && 1100 (stat != RPC_PROGUNAVAIL)) { 1101 goto error; 1102 } 1103 } 1104 error: 1105 CLNT_DESTROY(client); 1106 if (r.addr) 1107 xdr_free((xdrproc_t) xdr_wrapstring, (char *)&r.addr); 1108 return (stat); 1109 } 1110 1111 /* 1112 * Gets the time on the remote host. 1113 * Returns 1 if succeeds else 0. 1114 */ 1115 bool_t 1116 rpcb_gettime(host, timep) 1117 const char *host; 1118 time_t *timep; 1119 { 1120 CLIENT *client = NULL; 1121 void *handle; 1122 struct netconfig *nconf; 1123 long vers; 1124 enum clnt_stat st; 1125 1126 1127 if ((host == NULL) || (host[0] == NULL)) { 1128 time(timep); 1129 return (TRUE); 1130 } 1131 1132 if ((handle = __rpc_setconf("netpath")) == NULL) { 1133 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1134 return (FALSE); 1135 } 1136 rpc_createerr.cf_stat = RPC_SUCCESS; 1137 while (client == (CLIENT *)NULL) { 1138 if ((nconf = __rpc_getconf(handle)) == NULL) { 1139 if (rpc_createerr.cf_stat == RPC_SUCCESS) 1140 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1141 break; 1142 } 1143 client = getclnthandle(host, nconf, (char **)NULL); 1144 if (client) 1145 break; 1146 } 1147 __rpc_endconf(handle); 1148 if (client == (CLIENT *) NULL) { 1149 return (FALSE); 1150 } 1151 1152 st = CLNT_CALL(client, RPCBPROC_GETTIME, 1153 (xdrproc_t) xdr_void, (char *)NULL, 1154 (xdrproc_t) xdr_int, (char *)timep, tottimeout); 1155 1156 if ((st == RPC_PROGVERSMISMATCH) || (st == RPC_PROGUNAVAIL)) { 1157 CLNT_CONTROL(client, CLGET_VERS, (char *)&vers); 1158 if (vers == RPCBVERS4) { 1159 /* fall back to earlier version */ 1160 vers = RPCBVERS; 1161 CLNT_CONTROL(client, CLSET_VERS, (char *)&vers); 1162 st = CLNT_CALL(client, RPCBPROC_GETTIME, 1163 (xdrproc_t) xdr_void, (char *)NULL, 1164 (xdrproc_t) xdr_int, (char *) timep, 1165 tottimeout); 1166 } 1167 } 1168 CLNT_DESTROY(client); 1169 return (st == RPC_SUCCESS? TRUE: FALSE); 1170 } 1171 1172 /* 1173 * Converts taddr to universal address. This routine should never 1174 * really be called because local n2a libraries are always provided. 1175 */ 1176 char * 1177 rpcb_taddr2uaddr(nconf, taddr) 1178 struct netconfig *nconf; 1179 struct netbuf *taddr; 1180 { 1181 CLIENT *client; 1182 char *uaddr = NULL; 1183 1184 1185 /* parameter checking */ 1186 if (nconf == (struct netconfig *)NULL) { 1187 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1188 return (NULL); 1189 } 1190 if (taddr == NULL) { 1191 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 1192 return (NULL); 1193 } 1194 client = local_rpcb(); 1195 if (! client) { 1196 return (NULL); 1197 } 1198 1199 CLNT_CALL(client, RPCBPROC_TADDR2UADDR, (xdrproc_t) xdr_netbuf, 1200 (char *)taddr, (xdrproc_t) xdr_wrapstring, (char *)&uaddr, 1201 tottimeout); 1202 CLNT_DESTROY(client); 1203 return (uaddr); 1204 } 1205 1206 /* 1207 * Converts universal address to netbuf. This routine should never 1208 * really be called because local n2a libraries are always provided. 1209 */ 1210 struct netbuf * 1211 rpcb_uaddr2taddr(nconf, uaddr) 1212 struct netconfig *nconf; 1213 char *uaddr; 1214 { 1215 CLIENT *client; 1216 struct netbuf *taddr; 1217 1218 1219 /* parameter checking */ 1220 if (nconf == (struct netconfig *)NULL) { 1221 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1222 return (NULL); 1223 } 1224 if (uaddr == NULL) { 1225 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 1226 return (NULL); 1227 } 1228 client = local_rpcb(); 1229 if (! client) { 1230 return (NULL); 1231 } 1232 1233 taddr = (struct netbuf *)calloc(1, sizeof (struct netbuf)); 1234 if (taddr == NULL) { 1235 CLNT_DESTROY(client); 1236 return (NULL); 1237 } 1238 if (CLNT_CALL(client, RPCBPROC_UADDR2TADDR, (xdrproc_t) xdr_wrapstring, 1239 (char *) &uaddr, (xdrproc_t) xdr_netbuf, (char *)taddr, 1240 tottimeout) != RPC_SUCCESS) { 1241 free(taddr); 1242 taddr = NULL; 1243 } 1244 CLNT_DESTROY(client); 1245 return (taddr); 1246 } 1247