1 /* $NetBSD: rpcb_clnt.c,v 1.7 2000/12/20 20:52:24 christos 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 <stdio.h> 66 #include <errno.h> 67 #include <stdlib.h> 68 #include <string.h> 69 #include <unistd.h> 70 #include <netdb.h> 71 #include <syslog.h> 72 73 #include "rpc_com.h" 74 75 #ifdef __weak_alias 76 __weak_alias(rpcb_set,_rpcb_set) 77 __weak_alias(rpcb_unset,_rpcb_unset) 78 __weak_alias(rpcb_getmaps,_rpcb_getmaps) 79 __weak_alias(rpcb_rmtcall,_rpcb_rmtcall) 80 __weak_alias(rpcb_gettime,_rpcb_gettime) 81 __weak_alias(rpcb_taddr2uaddr,_rpcb_taddr2uaddr) 82 __weak_alias(rpcb_uaddr2taddr,_rpcb_uaddr2taddr) 83 #endif 84 85 static struct timeval tottimeout = { 60, 0 }; 86 static const struct timeval rmttimeout = { 3, 0 }; 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 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, 315 (rpcprog_t)RPCBPROG, (rpcvers_t)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 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 343 return NULL; 344 } 345 346 memset(&hints, 0, sizeof hints); 347 hints.ai_family = si.si_af; 348 hints.ai_socktype = si.si_socktype; 349 hints.ai_protocol = si.si_proto; 350 351 #ifdef CLNT_DEBUG 352 printf("trying netid %s family %d proto %d socktype %d\n", 353 nconf->nc_netid, si.si_af, si.si_proto, si.si_socktype); 354 #endif 355 356 if (getaddrinfo(host, "sunrpc", &hints, &res) != 0) { 357 rpc_createerr.cf_stat = RPC_UNKNOWNHOST; 358 return NULL; 359 } 360 361 for (tres = res; tres != NULL; tres = tres->ai_next) { 362 taddr.buf = tres->ai_addr; 363 taddr.len = taddr.maxlen = tres->ai_addrlen; 364 365 #ifdef ND_DEBUG 366 { 367 char *ua; 368 369 ua = taddr2uaddr(nconf, &taddr); 370 fprintf(stderr, "Got it [%s]\n", ua); 371 free(ua); 372 } 373 #endif 374 375 #ifdef ND_DEBUG 376 { 377 int i; 378 379 fprintf(stderr, "\tnetbuf len = %d, maxlen = %d\n", 380 taddr.len, taddr.maxlen); 381 fprintf(stderr, "\tAddress is "); 382 for (i = 0; i < taddr.len; i++) 383 fprintf(stderr, "%u.", ((char *)(taddr.buf))[i]); 384 fprintf(stderr, "\n"); 385 } 386 #endif 387 client = clnt_tli_create(RPC_ANYFD, nconf, &taddr, 388 (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0); 389 #ifdef ND_DEBUG 390 if (! client) { 391 clnt_pcreateerror("rpcbind clnt interface"); 392 } 393 #endif 394 395 if (client) { 396 tmpaddr = targaddr ? taddr2uaddr(nconf, &taddr) : NULL; 397 add_cache(host, nconf->nc_netid, &taddr, tmpaddr); 398 if (targaddr) 399 *targaddr = tmpaddr; 400 break; 401 } 402 } 403 freeaddrinfo(res); 404 return (client); 405 } 406 407 /* XXX */ 408 #define IN4_LOCALHOST_STRING "127.0.0.1" 409 #define IN6_LOCALHOST_STRING "::1" 410 411 /* 412 * This routine will return a client handle that is connected to the local 413 * rpcbind. Returns NULL on error and free's everything. 414 */ 415 static CLIENT * 416 local_rpcb() 417 { 418 CLIENT *client; 419 static struct netconfig *loopnconf; 420 static char *hostname; 421 #ifdef __REENT 422 extern mutex_t loopnconf_lock; 423 #endif 424 int sock; 425 size_t tsize; 426 struct netbuf nbuf; 427 struct sockaddr_un sun; 428 429 /* 430 * Try connecting to the local rpcbind through a local socket 431 * first. If this doesn't work, try all transports defined in 432 * the netconfig file. 433 */ 434 memset(&sun, 0, sizeof sun); 435 sock = socket(AF_LOCAL, SOCK_STREAM, 0); 436 if (sock < 0) 437 goto try_nconf; 438 sun.sun_family = AF_LOCAL; 439 strcpy(sun.sun_path, _PATH_RPCBINDSOCK); 440 nbuf.len = sun.sun_len = SUN_LEN(&sun); 441 nbuf.maxlen = sizeof (struct sockaddr_un); 442 nbuf.buf = &sun; 443 444 tsize = __rpc_get_t_size(AF_LOCAL, 0, 0); 445 client = clnt_vc_create(sock, &nbuf, (rpcprog_t)RPCBPROG, 446 (rpcvers_t)RPCBVERS, tsize, tsize); 447 448 if (client != NULL) 449 return client; 450 451 try_nconf: 452 453 /* VARIABLES PROTECTED BY loopnconf_lock: loopnconf */ 454 mutex_lock(&loopnconf_lock); 455 if (loopnconf == NULL) { 456 struct netconfig *nconf, *tmpnconf = NULL; 457 void *nc_handle; 458 int fd; 459 460 nc_handle = setnetconfig(); 461 if (nc_handle == NULL) { 462 /* fails to open netconfig file */ 463 syslog (LOG_ERR, "rpc: failed to open " NETCONFIG); 464 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 465 mutex_unlock(&loopnconf_lock); 466 return (NULL); 467 } 468 while ((nconf = getnetconfig(nc_handle)) != NULL) { 469 #ifdef INET6 470 if ((strcmp(nconf->nc_protofmly, NC_INET6) == 0 || 471 #else 472 if ( 473 #endif 474 strcmp(nconf->nc_protofmly, NC_INET) == 0) && 475 (nconf->nc_semantics == NC_TPI_COTS || 476 nconf->nc_semantics == NC_TPI_COTS_ORD)) { 477 fd = __rpc_nconf2fd(nconf); 478 /* 479 * Can't create a socket, assume that 480 * this family isn't configured in the kernel. 481 */ 482 if (fd < 0) 483 continue; 484 close(fd); 485 tmpnconf = nconf; 486 if (!strcmp(nconf->nc_protofmly, NC_INET)) 487 hostname = IN4_LOCALHOST_STRING; 488 else 489 hostname = IN6_LOCALHOST_STRING; 490 } 491 } 492 if (tmpnconf == NULL) { 493 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 494 mutex_unlock(&loopnconf_lock); 495 return (NULL); 496 } 497 loopnconf = getnetconfigent(tmpnconf->nc_netid); 498 /* loopnconf is never freed */ 499 endnetconfig(nc_handle); 500 } 501 mutex_unlock(&loopnconf_lock); 502 client = getclnthandle(hostname, loopnconf, NULL); 503 return (client); 504 } 505 506 /* 507 * Set a mapping between program, version and address. 508 * Calls the rpcbind service to do the mapping. 509 */ 510 bool_t 511 rpcb_set(program, version, nconf, address) 512 rpcprog_t program; 513 rpcvers_t version; 514 const struct netconfig *nconf; /* Network structure of transport */ 515 const struct netbuf *address; /* Services netconfig address */ 516 { 517 CLIENT *client; 518 bool_t rslt = FALSE; 519 RPCB parms; 520 char uidbuf[32]; 521 522 /* parameter checking */ 523 if (nconf == NULL) { 524 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 525 return (FALSE); 526 } 527 if (address == NULL) { 528 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 529 return (FALSE); 530 } 531 client = local_rpcb(); 532 if (! client) { 533 return (FALSE); 534 } 535 536 /* convert to universal */ 537 /*LINTED const castaway*/ 538 parms.r_addr = taddr2uaddr((struct netconfig *) nconf, 539 (struct netbuf *)address); 540 if (!parms.r_addr) { 541 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE; 542 return (FALSE); /* no universal address */ 543 } 544 parms.r_prog = program; 545 parms.r_vers = version; 546 parms.r_netid = nconf->nc_netid; 547 /* 548 * Though uid is not being used directly, we still send it for 549 * completeness. For non-unix platforms, perhaps some other 550 * string or an empty string can be sent. 551 */ 552 (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid()); 553 parms.r_owner = uidbuf; 554 555 CLNT_CALL(client, (rpcproc_t)RPCBPROC_SET, (xdrproc_t) xdr_rpcb, 556 (char *)(void *)&parms, (xdrproc_t) xdr_bool, 557 (char *)(void *)&rslt, tottimeout); 558 559 CLNT_DESTROY(client); 560 free(parms.r_addr); 561 return (rslt); 562 } 563 564 /* 565 * Remove the mapping between program, version and netbuf address. 566 * Calls the rpcbind service to do the un-mapping. 567 * If netbuf is NULL, unset for all the transports, otherwise unset 568 * only for the given transport. 569 */ 570 bool_t 571 rpcb_unset(program, version, nconf) 572 rpcprog_t program; 573 rpcvers_t version; 574 const struct netconfig *nconf; 575 { 576 CLIENT *client; 577 bool_t rslt = FALSE; 578 RPCB parms; 579 char uidbuf[32]; 580 581 client = local_rpcb(); 582 if (! client) { 583 return (FALSE); 584 } 585 586 parms.r_prog = program; 587 parms.r_vers = version; 588 if (nconf) 589 parms.r_netid = nconf->nc_netid; 590 else { 591 /*LINTED const castaway*/ 592 parms.r_netid = (char *) &nullstring[0]; /* unsets all */ 593 } 594 /*LINTED const castaway*/ 595 parms.r_addr = (char *) &nullstring[0]; 596 (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid()); 597 parms.r_owner = uidbuf; 598 599 CLNT_CALL(client, (rpcproc_t)RPCBPROC_UNSET, (xdrproc_t) xdr_rpcb, 600 (char *)(void *)&parms, (xdrproc_t) xdr_bool, 601 (char *)(void *)&rslt, tottimeout); 602 603 CLNT_DESTROY(client); 604 return (rslt); 605 } 606 607 /* 608 * From the merged list, find the appropriate entry 609 */ 610 static struct netbuf * 611 got_entry(relp, nconf) 612 rpcb_entry_list_ptr relp; 613 const struct netconfig *nconf; 614 { 615 struct netbuf *na = NULL; 616 rpcb_entry_list_ptr sp; 617 rpcb_entry *rmap; 618 619 for (sp = relp; sp != NULL; sp = sp->rpcb_entry_next) { 620 rmap = &sp->rpcb_entry_map; 621 if ((strcmp(nconf->nc_proto, rmap->r_nc_proto) == 0) && 622 (strcmp(nconf->nc_protofmly, rmap->r_nc_protofmly) == 0) && 623 (nconf->nc_semantics == rmap->r_nc_semantics) && 624 (rmap->r_maddr != NULL) && (rmap->r_maddr[0] != NULL)) { 625 na = uaddr2taddr(nconf, rmap->r_maddr); 626 #ifdef ND_DEBUG 627 fprintf(stderr, "\tRemote address is [%s].\n", 628 rmap->r_maddr); 629 if (!na) 630 fprintf(stderr, 631 "\tCouldn't resolve remote address!\n"); 632 #endif 633 break; 634 } 635 } 636 return (na); 637 } 638 639 /* 640 * An internal function which optimizes rpcb_getaddr function. It also 641 * returns the client handle that it uses to contact the remote rpcbind. 642 * 643 * The algorithm used: If the transports is TCP or UDP, it first tries 644 * version 2 (portmap), 4 and then 3 (svr4). This order should be 645 * changed in the next OS release to 4, 2 and 3. We are assuming that by 646 * that time, version 4 would be available on many machines on the network. 647 * With this algorithm, we get performance as well as a plan for 648 * obsoleting version 2. 649 * 650 * For all other transports, the algorithm remains as 4 and then 3. 651 * 652 * XXX: Due to some problems with t_connect(), we do not reuse the same client 653 * handle for COTS cases and hence in these cases we do not return the 654 * client handle. This code will change if t_connect() ever 655 * starts working properly. Also look under clnt_vc.c. 656 */ 657 struct netbuf * 658 __rpcb_findaddr(program, version, nconf, host, clpp) 659 rpcprog_t program; 660 rpcvers_t version; 661 const struct netconfig *nconf; 662 const char *host; 663 CLIENT **clpp; 664 { 665 CLIENT *client = NULL; 666 RPCB parms; 667 enum clnt_stat clnt_st; 668 char *ua = NULL; 669 rpcvers_t vers; 670 struct netbuf *address = NULL; 671 rpcvers_t start_vers = RPCBVERS4; 672 struct netbuf servaddr; 673 674 /* parameter checking */ 675 if (nconf == NULL) { 676 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 677 return (NULL); 678 } 679 680 parms.r_addr = NULL; 681 682 #ifdef PORTMAP 683 /* Try version 2 for TCP or UDP */ 684 if (strcmp(nconf->nc_protofmly, NC_INET) == 0) { 685 u_short port = 0; 686 struct netbuf remote; 687 rpcvers_t pmapvers = 2; 688 struct pmap pmapparms; 689 690 /* 691 * Try UDP only - there are some portmappers out 692 * there that use UDP only. 693 */ 694 if (strcmp(nconf->nc_proto, NC_TCP) == 0) { 695 struct netconfig *newnconf; 696 697 if ((newnconf = getnetconfigent("udp")) == NULL) { 698 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 699 return (NULL); 700 } 701 client = getclnthandle(host, newnconf, &parms.r_addr); 702 freenetconfigent(newnconf); 703 } else { 704 client = getclnthandle(host, nconf, &parms.r_addr); 705 } 706 if (client == NULL) { 707 return (NULL); 708 } 709 710 /* Set the version */ 711 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&pmapvers); 712 pmapparms.pm_prog = program; 713 pmapparms.pm_vers = version; 714 pmapparms.pm_prot = strcmp(nconf->nc_proto, NC_TCP) ? 715 IPPROTO_UDP : IPPROTO_TCP; 716 pmapparms.pm_port = 0; /* not needed */ 717 clnt_st = CLNT_CALL(client, (rpcproc_t)PMAPPROC_GETPORT, 718 (xdrproc_t) xdr_pmap, (caddr_t)(void *)&pmapparms, 719 (xdrproc_t) xdr_u_short, (caddr_t)(void *)&port, 720 tottimeout); 721 if (clnt_st != RPC_SUCCESS) { 722 if ((clnt_st == RPC_PROGVERSMISMATCH) || 723 (clnt_st == RPC_PROGUNAVAIL)) 724 goto try_rpcbind; /* Try different versions */ 725 rpc_createerr.cf_stat = RPC_PMAPFAILURE; 726 clnt_geterr(client, &rpc_createerr.cf_error); 727 goto error; 728 } else if (port == 0) { 729 address = NULL; 730 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 731 goto error; 732 } 733 port = htons(port); 734 CLNT_CONTROL(client, CLGET_SVC_ADDR, (char *)(void *)&remote); 735 if (((address = (struct netbuf *) 736 malloc(sizeof (struct netbuf))) == NULL) || 737 ((address->buf = (char *) 738 malloc(remote.len)) == NULL)) { 739 rpc_createerr.cf_stat = RPC_SYSTEMERROR; 740 clnt_geterr(client, &rpc_createerr.cf_error); 741 if (address) { 742 free(address); 743 address = NULL; 744 } 745 goto error; 746 } 747 memcpy(address->buf, remote.buf, remote.len); 748 memcpy(&((char *)address->buf)[sizeof (short)], 749 (char *)(void *)&port, sizeof (short)); 750 address->len = address->maxlen = remote.len; 751 goto done; 752 } 753 #endif 754 755 try_rpcbind: 756 /* 757 * Now we try version 4 and then 3. 758 * We also send the remote system the address we used to 759 * contact it in case it can help to connect back with us 760 */ 761 parms.r_prog = program; 762 parms.r_vers = version; 763 /*LINTED const castaway*/ 764 parms.r_owner = (char *) &nullstring[0]; /* not needed; */ 765 /* just for xdring */ 766 parms.r_netid = nconf->nc_netid; /* not really needed */ 767 768 /* 769 * If a COTS transport is being used, try getting address via CLTS 770 * transport. This works only with version 4. 771 * NOTE: This is being done for all transports EXCEPT LOOPBACK 772 * because with loopback the cost to go to a COTS is same as 773 * the cost to go through CLTS, plus you get the advantage of 774 * finding out immediately if the local rpcbind process is dead. 775 */ 776 #if 1 777 if ((nconf->nc_semantics == NC_TPI_COTS_ORD || 778 nconf->nc_semantics == NC_TPI_COTS) && 779 (strcmp(nconf->nc_protofmly, NC_LOOPBACK) != 0)) { 780 #else 781 if (client != NULL) { 782 CLNT_DESTROY(client); 783 client = NULL; 784 } 785 if (nconf->nc_semantics == NC_TPI_CLTS) { 786 #endif 787 void *handle; 788 struct netconfig *nconf_clts; 789 rpcb_entry_list_ptr relp = NULL; 790 791 if (client == NULL) { 792 /* This did not go through the above PORTMAP/TCP code */ 793 #if 1 794 if ((handle = __rpc_setconf("datagram_v")) != NULL) { 795 #else 796 if ((handle = __rpc_setconf("circuit_v")) != NULL) { 797 #endif 798 while ((nconf_clts = __rpc_getconf(handle)) 799 != NULL) { 800 if (strcmp(nconf_clts->nc_protofmly, 801 nconf->nc_protofmly) != 0) { 802 continue; 803 } 804 client = getclnthandle(host, nconf_clts, 805 &parms.r_addr); 806 break; 807 } 808 __rpc_endconf(handle); 809 } 810 if (client == NULL) 811 goto regular_rpcbind; /* Go the regular way */ 812 } else { 813 /* This is a UDP PORTMAP handle. Change to version 4 */ 814 vers = RPCBVERS4; 815 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 816 } 817 /* 818 * We also send the remote system the address we used to 819 * contact it in case it can help it connect back with us 820 */ 821 if (parms.r_addr == NULL) { 822 /*LINTED const castaway*/ 823 parms.r_addr = (char *) &nullstring[0]; /* for XDRing */ 824 } 825 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDRLIST, 826 (xdrproc_t) xdr_rpcb, (char *)(void *)&parms, 827 (xdrproc_t) xdr_rpcb_entry_list_ptr, 828 (char *)(void *)&relp, tottimeout); 829 if (clnt_st == RPC_SUCCESS) { 830 if ((address = got_entry(relp, nconf)) != NULL) { 831 xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr, 832 (char *)(void *)&relp); 833 goto done; 834 } 835 /* Entry not found for this transport */ 836 xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr, 837 (char *)(void *)&relp); 838 /* 839 * XXX: should have perhaps returned with error but 840 * since the remote machine might not always be able 841 * to send the address on all transports, we try the 842 * regular way with regular_rpcbind 843 */ 844 goto regular_rpcbind; 845 } else if ((clnt_st == RPC_PROGVERSMISMATCH) || 846 (clnt_st == RPC_PROGUNAVAIL)) { 847 start_vers = RPCBVERS; /* Try version 3 now */ 848 goto regular_rpcbind; /* Try different versions */ 849 } else { 850 rpc_createerr.cf_stat = RPC_PMAPFAILURE; 851 clnt_geterr(client, &rpc_createerr.cf_error); 852 goto error; 853 } 854 } 855 856 regular_rpcbind: 857 858 /* Now the same transport is to be used to get the address */ 859 #if 1 860 if (client && ((nconf->nc_semantics == NC_TPI_COTS_ORD) || 861 (nconf->nc_semantics == NC_TPI_COTS))) { 862 #else 863 if (client && nconf->nc_semantics == NC_TPI_CLTS) { 864 #endif 865 /* A CLTS type of client - destroy it */ 866 CLNT_DESTROY(client); 867 client = NULL; 868 } 869 870 if (client == NULL) { 871 client = getclnthandle(host, nconf, &parms.r_addr); 872 if (client == NULL) { 873 goto error; 874 } 875 } 876 if (parms.r_addr == NULL) { 877 /*LINTED const castaway*/ 878 parms.r_addr = (char *) &nullstring[0]; 879 } 880 881 /* First try from start_vers and then version 3 (RPCBVERS) */ 882 for (vers = start_vers; vers >= RPCBVERS; vers--) { 883 /* Set the version */ 884 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 885 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDR, 886 (xdrproc_t) xdr_rpcb, (char *)(void *)&parms, 887 (xdrproc_t) xdr_wrapstring, (char *)(void *) &ua, 888 tottimeout); 889 if (clnt_st == RPC_SUCCESS) { 890 if ((ua == NULL) || (ua[0] == NULL)) { 891 /* address unknown */ 892 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 893 goto error; 894 } 895 address = uaddr2taddr(nconf, ua); 896 #ifdef ND_DEBUG 897 fprintf(stderr, "\tRemote address is [%s]\n", ua); 898 if (!address) 899 fprintf(stderr, 900 "\tCouldn't resolve remote address!\n"); 901 #endif 902 xdr_free((xdrproc_t)xdr_wrapstring, 903 (char *)(void *)&ua); 904 905 if (! address) { 906 /* We don't know about your universal address */ 907 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE; 908 goto error; 909 } 910 CLNT_CONTROL(client, CLGET_SVC_ADDR, 911 (char *)(void *)&servaddr); 912 __rpc_fixup_addr(address, &servaddr); 913 goto done; 914 } else if (clnt_st == RPC_PROGVERSMISMATCH) { 915 struct rpc_err rpcerr; 916 917 clnt_geterr(client, &rpcerr); 918 if (rpcerr.re_vers.low > RPCBVERS4) 919 goto error; /* a new version, can't handle */ 920 } else if (clnt_st != RPC_PROGUNAVAIL) { 921 /* Cant handle this error */ 922 rpc_createerr.cf_stat = clnt_st; 923 clnt_geterr(client, &rpc_createerr.cf_error); 924 goto error; 925 } 926 } 927 928 if ((address == NULL) || (address->len == 0)) { 929 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 930 clnt_geterr(client, &rpc_createerr.cf_error); 931 } 932 933 error: 934 if (client) { 935 CLNT_DESTROY(client); 936 client = NULL; 937 } 938 done: 939 if (nconf->nc_semantics != NC_TPI_CLTS) { 940 /* This client is the connectionless one */ 941 if (client) { 942 CLNT_DESTROY(client); 943 client = NULL; 944 } 945 } 946 if (clpp) { 947 *clpp = client; 948 } else if (client) { 949 CLNT_DESTROY(client); 950 } 951 return (address); 952 } 953 954 955 /* 956 * Find the mapped address for program, version. 957 * Calls the rpcbind service remotely to do the lookup. 958 * Uses the transport specified in nconf. 959 * Returns FALSE (0) if no map exists, else returns 1. 960 * 961 * Assuming that the address is all properly allocated 962 */ 963 int 964 rpcb_getaddr(program, version, nconf, address, host) 965 rpcprog_t program; 966 rpcvers_t version; 967 const struct netconfig *nconf; 968 struct netbuf *address; 969 const char *host; 970 { 971 struct netbuf *na; 972 973 if ((na = __rpcb_findaddr(program, version, nconf, 974 host, (CLIENT **) NULL)) == NULL) 975 return (FALSE); 976 977 if (na->len > address->maxlen) { 978 /* Too long address */ 979 free(na->buf); 980 free(na); 981 rpc_createerr.cf_stat = RPC_FAILED; 982 return (FALSE); 983 } 984 memcpy(address->buf, na->buf, (size_t)na->len); 985 address->len = na->len; 986 free(na->buf); 987 free(na); 988 return (TRUE); 989 } 990 991 /* 992 * Get a copy of the current maps. 993 * Calls the rpcbind service remotely to get the maps. 994 * 995 * It returns only a list of the services 996 * It returns NULL on failure. 997 */ 998 rpcblist * 999 rpcb_getmaps(nconf, host) 1000 const struct netconfig *nconf; 1001 const char *host; 1002 { 1003 rpcblist_ptr head = NULL; 1004 CLIENT *client; 1005 enum clnt_stat clnt_st; 1006 rpcvers_t vers = 0; 1007 1008 client = getclnthandle(host, nconf, NULL); 1009 if (client == NULL) { 1010 return (head); 1011 } 1012 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP, 1013 (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr, 1014 (char *)(void *)&head, tottimeout); 1015 if (clnt_st == RPC_SUCCESS) 1016 goto done; 1017 1018 if ((clnt_st != RPC_PROGVERSMISMATCH) && 1019 (clnt_st != RPC_PROGUNAVAIL)) { 1020 rpc_createerr.cf_stat = RPC_RPCBFAILURE; 1021 clnt_geterr(client, &rpc_createerr.cf_error); 1022 goto done; 1023 } 1024 1025 /* fall back to earlier version */ 1026 CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers); 1027 if (vers == RPCBVERS4) { 1028 vers = RPCBVERS; 1029 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 1030 if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP, 1031 (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr, 1032 (char *)(void *)&head, tottimeout) == RPC_SUCCESS) 1033 goto done; 1034 } 1035 rpc_createerr.cf_stat = RPC_RPCBFAILURE; 1036 clnt_geterr(client, &rpc_createerr.cf_error); 1037 1038 done: 1039 CLNT_DESTROY(client); 1040 return (head); 1041 } 1042 1043 /* 1044 * rpcbinder remote-call-service interface. 1045 * This routine is used to call the rpcbind remote call service 1046 * which will look up a service program in the address maps, and then 1047 * remotely call that routine with the given parameters. This allows 1048 * programs to do a lookup and call in one step. 1049 */ 1050 enum clnt_stat 1051 rpcb_rmtcall(nconf, host, prog, vers, proc, xdrargs, argsp, 1052 xdrres, resp, tout, addr_ptr) 1053 const struct netconfig *nconf; /* Netconfig structure */ 1054 const char *host; /* Remote host name */ 1055 rpcprog_t prog; 1056 rpcvers_t vers; 1057 rpcproc_t proc; /* Remote proc identifiers */ 1058 xdrproc_t xdrargs, xdrres; /* XDR routines */ 1059 caddr_t argsp, resp; /* Argument and Result */ 1060 struct timeval tout; /* Timeout value for this call */ 1061 const struct netbuf *addr_ptr; /* Preallocated netbuf address */ 1062 { 1063 CLIENT *client; 1064 enum clnt_stat stat; 1065 struct r_rpcb_rmtcallargs a; 1066 struct r_rpcb_rmtcallres r; 1067 rpcvers_t rpcb_vers; 1068 1069 1070 client = getclnthandle(host, nconf, NULL); 1071 if (client == NULL) { 1072 return (RPC_FAILED); 1073 } 1074 /*LINTED const castaway*/ 1075 CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *)(void *)&rmttimeout); 1076 a.prog = prog; 1077 a.vers = vers; 1078 a.proc = proc; 1079 a.args.args_val = argsp; 1080 a.xdr_args = xdrargs; 1081 r.addr = NULL; 1082 r.results.results_val = resp; 1083 r.xdr_res = xdrres; 1084 1085 for (rpcb_vers = RPCBVERS4; rpcb_vers >= RPCBVERS; rpcb_vers--) { 1086 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&rpcb_vers); 1087 stat = CLNT_CALL(client, (rpcproc_t)RPCBPROC_CALLIT, 1088 (xdrproc_t) xdr_rpcb_rmtcallargs, (char *)(void *)&a, 1089 (xdrproc_t) xdr_rpcb_rmtcallres, (char *)(void *)&r, tout); 1090 if ((stat == RPC_SUCCESS) && (addr_ptr != NULL)) { 1091 struct netbuf *na; 1092 /*LINTED const castaway*/ 1093 na = uaddr2taddr((struct netconfig *) nconf, r.addr); 1094 if (!na) { 1095 stat = RPC_N2AXLATEFAILURE; 1096 /*LINTED const castaway*/ 1097 ((struct netbuf *) addr_ptr)->len = 0; 1098 goto error; 1099 } 1100 if (na->len > addr_ptr->maxlen) { 1101 /* Too long address */ 1102 stat = RPC_FAILED; /* XXX A better error no */ 1103 free(na->buf); 1104 free(na); 1105 /*LINTED const castaway*/ 1106 ((struct netbuf *) addr_ptr)->len = 0; 1107 goto error; 1108 } 1109 memcpy(addr_ptr->buf, na->buf, (size_t)na->len); 1110 /*LINTED const castaway*/ 1111 ((struct netbuf *)addr_ptr)->len = na->len; 1112 free(na->buf); 1113 free(na); 1114 break; 1115 } else if ((stat != RPC_PROGVERSMISMATCH) && 1116 (stat != RPC_PROGUNAVAIL)) { 1117 goto error; 1118 } 1119 } 1120 error: 1121 CLNT_DESTROY(client); 1122 if (r.addr) 1123 xdr_free((xdrproc_t) xdr_wrapstring, (char *)(void *)&r.addr); 1124 return (stat); 1125 } 1126 1127 /* 1128 * Gets the time on the remote host. 1129 * Returns 1 if succeeds else 0. 1130 */ 1131 bool_t 1132 rpcb_gettime(host, timep) 1133 const char *host; 1134 time_t *timep; 1135 { 1136 CLIENT *client = NULL; 1137 void *handle; 1138 struct netconfig *nconf; 1139 rpcvers_t vers; 1140 enum clnt_stat st; 1141 1142 1143 if ((host == NULL) || (host[0] == NULL)) { 1144 time(timep); 1145 return (TRUE); 1146 } 1147 1148 if ((handle = __rpc_setconf("netpath")) == NULL) { 1149 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1150 return (FALSE); 1151 } 1152 rpc_createerr.cf_stat = RPC_SUCCESS; 1153 while (client == NULL) { 1154 if ((nconf = __rpc_getconf(handle)) == NULL) { 1155 if (rpc_createerr.cf_stat == RPC_SUCCESS) 1156 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1157 break; 1158 } 1159 client = getclnthandle(host, nconf, NULL); 1160 if (client) 1161 break; 1162 } 1163 __rpc_endconf(handle); 1164 if (client == (CLIENT *) NULL) { 1165 return (FALSE); 1166 } 1167 1168 st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME, 1169 (xdrproc_t) xdr_void, NULL, 1170 (xdrproc_t) xdr_int, (char *)(void *)timep, tottimeout); 1171 1172 if ((st == RPC_PROGVERSMISMATCH) || (st == RPC_PROGUNAVAIL)) { 1173 CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers); 1174 if (vers == RPCBVERS4) { 1175 /* fall back to earlier version */ 1176 vers = RPCBVERS; 1177 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 1178 st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME, 1179 (xdrproc_t) xdr_void, NULL, 1180 (xdrproc_t) xdr_int, (char *)(void *)timep, 1181 tottimeout); 1182 } 1183 } 1184 CLNT_DESTROY(client); 1185 return (st == RPC_SUCCESS? TRUE: FALSE); 1186 } 1187 1188 /* 1189 * Converts taddr to universal address. This routine should never 1190 * really be called because local n2a libraries are always provided. 1191 */ 1192 char * 1193 rpcb_taddr2uaddr(nconf, taddr) 1194 struct netconfig *nconf; 1195 struct netbuf *taddr; 1196 { 1197 CLIENT *client; 1198 char *uaddr = NULL; 1199 1200 1201 /* parameter checking */ 1202 if (nconf == NULL) { 1203 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1204 return (NULL); 1205 } 1206 if (taddr == NULL) { 1207 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 1208 return (NULL); 1209 } 1210 client = local_rpcb(); 1211 if (! client) { 1212 return (NULL); 1213 } 1214 1215 CLNT_CALL(client, (rpcproc_t)RPCBPROC_TADDR2UADDR, 1216 (xdrproc_t) xdr_netbuf, (char *)(void *)taddr, 1217 (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr, tottimeout); 1218 CLNT_DESTROY(client); 1219 return (uaddr); 1220 } 1221 1222 /* 1223 * Converts universal address to netbuf. This routine should never 1224 * really be called because local n2a libraries are always provided. 1225 */ 1226 struct netbuf * 1227 rpcb_uaddr2taddr(nconf, uaddr) 1228 struct netconfig *nconf; 1229 char *uaddr; 1230 { 1231 CLIENT *client; 1232 struct netbuf *taddr; 1233 1234 1235 /* parameter checking */ 1236 if (nconf == NULL) { 1237 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1238 return (NULL); 1239 } 1240 if (uaddr == NULL) { 1241 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 1242 return (NULL); 1243 } 1244 client = local_rpcb(); 1245 if (! client) { 1246 return (NULL); 1247 } 1248 1249 taddr = (struct netbuf *)calloc(1, sizeof (struct netbuf)); 1250 if (taddr == NULL) { 1251 CLNT_DESTROY(client); 1252 return (NULL); 1253 } 1254 if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_UADDR2TADDR, 1255 (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr, 1256 (xdrproc_t) xdr_netbuf, (char *)(void *)taddr, 1257 tottimeout) != RPC_SUCCESS) { 1258 free(taddr); 1259 taddr = NULL; 1260 } 1261 CLNT_DESTROY(client); 1262 return (taddr); 1263 } 1264