rpcb_clnt.c revision 1.9
1 /* $NetBSD: rpcb_clnt.c,v 1.9 2001/09/27 18:59:37 jdolecek 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 return client; 468 469 try_nconf: 470 471 /* VARIABLES PROTECTED BY loopnconf_lock: loopnconf */ 472 mutex_lock(&loopnconf_lock); 473 if (loopnconf == NULL) { 474 struct netconfig *nconf, *tmpnconf = NULL; 475 void *nc_handle; 476 int fd; 477 478 nc_handle = setnetconfig(); 479 if (nc_handle == NULL) { 480 /* fails to open netconfig file */ 481 syslog (LOG_ERR, "rpc: failed to open " NETCONFIG); 482 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 483 mutex_unlock(&loopnconf_lock); 484 return (NULL); 485 } 486 while ((nconf = getnetconfig(nc_handle)) != NULL) { 487 #ifdef INET6 488 if ((strcmp(nconf->nc_protofmly, NC_INET6) == 0 || 489 #else 490 if (( 491 #endif 492 strcmp(nconf->nc_protofmly, NC_INET) == 0) && 493 (nconf->nc_semantics == NC_TPI_COTS || 494 nconf->nc_semantics == NC_TPI_COTS_ORD)) { 495 fd = __rpc_nconf2fd(nconf); 496 /* 497 * Can't create a socket, assume that 498 * this family isn't configured in the kernel. 499 */ 500 if (fd < 0) 501 continue; 502 close(fd); 503 tmpnconf = nconf; 504 if (!strcmp(nconf->nc_protofmly, NC_INET)) 505 hostname = IN4_LOCALHOST_STRING; 506 else 507 hostname = IN6_LOCALHOST_STRING; 508 } 509 } 510 if (tmpnconf == NULL) { 511 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 512 mutex_unlock(&loopnconf_lock); 513 return (NULL); 514 } 515 loopnconf = getnetconfigent(tmpnconf->nc_netid); 516 /* loopnconf is never freed */ 517 endnetconfig(nc_handle); 518 } 519 mutex_unlock(&loopnconf_lock); 520 client = getclnthandle(hostname, loopnconf, NULL); 521 return (client); 522 } 523 524 /* 525 * Set a mapping between program, version and address. 526 * Calls the rpcbind service to do the mapping. 527 */ 528 bool_t 529 rpcb_set(program, version, nconf, address) 530 rpcprog_t program; 531 rpcvers_t version; 532 const struct netconfig *nconf; /* Network structure of transport */ 533 const struct netbuf *address; /* Services netconfig address */ 534 { 535 CLIENT *client; 536 bool_t rslt = FALSE; 537 RPCB parms; 538 char uidbuf[32]; 539 540 /* parameter checking */ 541 if (nconf == NULL) { 542 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 543 return (FALSE); 544 } 545 if (address == NULL) { 546 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 547 return (FALSE); 548 } 549 client = local_rpcb(); 550 if (! client) { 551 return (FALSE); 552 } 553 554 /* convert to universal */ 555 /*LINTED const castaway*/ 556 parms.r_addr = taddr2uaddr((struct netconfig *) nconf, 557 (struct netbuf *)address); 558 if (!parms.r_addr) { 559 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE; 560 return (FALSE); /* no universal address */ 561 } 562 parms.r_prog = program; 563 parms.r_vers = version; 564 parms.r_netid = nconf->nc_netid; 565 /* 566 * Though uid is not being used directly, we still send it for 567 * completeness. For non-unix platforms, perhaps some other 568 * string or an empty string can be sent. 569 */ 570 (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid()); 571 parms.r_owner = uidbuf; 572 573 CLNT_CALL(client, (rpcproc_t)RPCBPROC_SET, (xdrproc_t) xdr_rpcb, 574 (char *)(void *)&parms, (xdrproc_t) xdr_bool, 575 (char *)(void *)&rslt, tottimeout); 576 577 CLNT_DESTROY(client); 578 free(parms.r_addr); 579 return (rslt); 580 } 581 582 /* 583 * Remove the mapping between program, version and netbuf address. 584 * Calls the rpcbind service to do the un-mapping. 585 * If netbuf is NULL, unset for all the transports, otherwise unset 586 * only for the given transport. 587 */ 588 bool_t 589 rpcb_unset(program, version, nconf) 590 rpcprog_t program; 591 rpcvers_t version; 592 const struct netconfig *nconf; 593 { 594 CLIENT *client; 595 bool_t rslt = FALSE; 596 RPCB parms; 597 char uidbuf[32]; 598 599 client = local_rpcb(); 600 if (! client) { 601 return (FALSE); 602 } 603 604 parms.r_prog = program; 605 parms.r_vers = version; 606 if (nconf) 607 parms.r_netid = nconf->nc_netid; 608 else { 609 /*LINTED const castaway*/ 610 parms.r_netid = (char *) &nullstring[0]; /* unsets all */ 611 } 612 /*LINTED const castaway*/ 613 parms.r_addr = (char *) &nullstring[0]; 614 (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid()); 615 parms.r_owner = uidbuf; 616 617 CLNT_CALL(client, (rpcproc_t)RPCBPROC_UNSET, (xdrproc_t) xdr_rpcb, 618 (char *)(void *)&parms, (xdrproc_t) xdr_bool, 619 (char *)(void *)&rslt, tottimeout); 620 621 CLNT_DESTROY(client); 622 return (rslt); 623 } 624 625 /* 626 * From the merged list, find the appropriate entry 627 */ 628 static struct netbuf * 629 got_entry(relp, nconf) 630 rpcb_entry_list_ptr relp; 631 const struct netconfig *nconf; 632 { 633 struct netbuf *na = NULL; 634 rpcb_entry_list_ptr sp; 635 rpcb_entry *rmap; 636 637 _DIAGASSERT(nconf != NULL); 638 639 for (sp = relp; sp != NULL; sp = sp->rpcb_entry_next) { 640 rmap = &sp->rpcb_entry_map; 641 if ((strcmp(nconf->nc_proto, rmap->r_nc_proto) == 0) && 642 (strcmp(nconf->nc_protofmly, rmap->r_nc_protofmly) == 0) && 643 (nconf->nc_semantics == rmap->r_nc_semantics) && 644 (rmap->r_maddr != NULL) && (rmap->r_maddr[0] != NULL)) { 645 na = uaddr2taddr(nconf, rmap->r_maddr); 646 #ifdef ND_DEBUG 647 fprintf(stderr, "\tRemote address is [%s].\n", 648 rmap->r_maddr); 649 if (!na) 650 fprintf(stderr, 651 "\tCouldn't resolve remote address!\n"); 652 #endif 653 break; 654 } 655 } 656 return (na); 657 } 658 659 /* 660 * An internal function which optimizes rpcb_getaddr function. It also 661 * returns the client handle that it uses to contact the remote rpcbind. 662 * 663 * The algorithm used: If the transports is TCP or UDP, it first tries 664 * version 2 (portmap), 4 and then 3 (svr4). This order should be 665 * changed in the next OS release to 4, 2 and 3. We are assuming that by 666 * that time, version 4 would be available on many machines on the network. 667 * With this algorithm, we get performance as well as a plan for 668 * obsoleting version 2. 669 * 670 * For all other transports, the algorithm remains as 4 and then 3. 671 * 672 * XXX: Due to some problems with t_connect(), we do not reuse the same client 673 * handle for COTS cases and hence in these cases we do not return the 674 * client handle. This code will change if t_connect() ever 675 * starts working properly. Also look under clnt_vc.c. 676 */ 677 struct netbuf * 678 __rpcb_findaddr(program, version, nconf, host, clpp) 679 rpcprog_t program; 680 rpcvers_t version; 681 const struct netconfig *nconf; 682 const char *host; 683 CLIENT **clpp; 684 { 685 CLIENT *client = NULL; 686 RPCB parms; 687 enum clnt_stat clnt_st; 688 char *ua = NULL; 689 rpcvers_t vers; 690 struct netbuf *address = NULL; 691 rpcvers_t start_vers = RPCBVERS4; 692 struct netbuf servaddr; 693 694 /* nconf is handled below */ 695 _DIAGASSERT(host != NULL); 696 /* clpp may be NULL */ 697 698 /* parameter checking */ 699 if (nconf == NULL) { 700 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 701 return (NULL); 702 } 703 704 parms.r_addr = NULL; 705 706 #ifdef PORTMAP 707 /* Try version 2 for TCP or UDP */ 708 if (strcmp(nconf->nc_protofmly, NC_INET) == 0) { 709 u_short port = 0; 710 struct netbuf remote; 711 rpcvers_t pmapvers = 2; 712 struct pmap pmapparms; 713 714 /* 715 * Try UDP only - there are some portmappers out 716 * there that use UDP only. 717 */ 718 if (strcmp(nconf->nc_proto, NC_TCP) == 0) { 719 struct netconfig *newnconf; 720 721 if ((newnconf = getnetconfigent("udp")) == NULL) { 722 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 723 return (NULL); 724 } 725 client = getclnthandle(host, newnconf, &parms.r_addr); 726 freenetconfigent(newnconf); 727 } else { 728 client = getclnthandle(host, nconf, &parms.r_addr); 729 } 730 if (client == NULL) { 731 return (NULL); 732 } 733 734 /* Set the version */ 735 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&pmapvers); 736 pmapparms.pm_prog = program; 737 pmapparms.pm_vers = version; 738 pmapparms.pm_prot = strcmp(nconf->nc_proto, NC_TCP) ? 739 IPPROTO_UDP : IPPROTO_TCP; 740 pmapparms.pm_port = 0; /* not needed */ 741 clnt_st = CLNT_CALL(client, (rpcproc_t)PMAPPROC_GETPORT, 742 (xdrproc_t) xdr_pmap, (caddr_t)(void *)&pmapparms, 743 (xdrproc_t) xdr_u_short, (caddr_t)(void *)&port, 744 tottimeout); 745 if (clnt_st != RPC_SUCCESS) { 746 if ((clnt_st == RPC_PROGVERSMISMATCH) || 747 (clnt_st == RPC_PROGUNAVAIL)) 748 goto try_rpcbind; /* Try different versions */ 749 rpc_createerr.cf_stat = RPC_PMAPFAILURE; 750 clnt_geterr(client, &rpc_createerr.cf_error); 751 goto error; 752 } else if (port == 0) { 753 address = NULL; 754 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 755 goto error; 756 } 757 port = htons(port); 758 CLNT_CONTROL(client, CLGET_SVC_ADDR, (char *)(void *)&remote); 759 if (((address = (struct netbuf *) 760 malloc(sizeof (struct netbuf))) == NULL) || 761 ((address->buf = (char *) 762 malloc(remote.len)) == NULL)) { 763 rpc_createerr.cf_stat = RPC_SYSTEMERROR; 764 clnt_geterr(client, &rpc_createerr.cf_error); 765 if (address) { 766 free(address); 767 address = NULL; 768 } 769 goto error; 770 } 771 memcpy(address->buf, remote.buf, remote.len); 772 memcpy(&((char *)address->buf)[sizeof (short)], 773 (char *)(void *)&port, sizeof (short)); 774 address->len = address->maxlen = remote.len; 775 goto done; 776 } 777 #endif 778 779 try_rpcbind: 780 /* 781 * Now we try version 4 and then 3. 782 * We also send the remote system the address we used to 783 * contact it in case it can help to connect back with us 784 */ 785 parms.r_prog = program; 786 parms.r_vers = version; 787 /*LINTED const castaway*/ 788 parms.r_owner = (char *) &nullstring[0]; /* not needed; */ 789 /* just for xdring */ 790 parms.r_netid = nconf->nc_netid; /* not really needed */ 791 792 /* 793 * If a COTS transport is being used, try getting address via CLTS 794 * transport. This works only with version 4. 795 * NOTE: This is being done for all transports EXCEPT LOOPBACK 796 * because with loopback the cost to go to a COTS is same as 797 * the cost to go through CLTS, plus you get the advantage of 798 * finding out immediately if the local rpcbind process is dead. 799 */ 800 #if 1 801 if ((nconf->nc_semantics == NC_TPI_COTS_ORD || 802 nconf->nc_semantics == NC_TPI_COTS) && 803 (strcmp(nconf->nc_protofmly, NC_LOOPBACK) != 0)) 804 #else 805 if (client != NULL) { 806 CLNT_DESTROY(client); 807 client = NULL; 808 } 809 if (nconf->nc_semantics == NC_TPI_CLTS) 810 #endif 811 { 812 void *handle; 813 struct netconfig *nconf_clts; 814 rpcb_entry_list_ptr relp = NULL; 815 816 if (client == NULL) { 817 /* This did not go through the above PORTMAP/TCP code */ 818 #if 1 819 if ((handle = __rpc_setconf("datagram_v")) != NULL) 820 #else 821 if ((handle = __rpc_setconf("circuit_v")) != NULL) 822 #endif 823 { 824 while ((nconf_clts = __rpc_getconf(handle)) 825 != NULL) { 826 if (strcmp(nconf_clts->nc_protofmly, 827 nconf->nc_protofmly) != 0) { 828 continue; 829 } 830 client = getclnthandle(host, nconf_clts, 831 &parms.r_addr); 832 break; 833 } 834 __rpc_endconf(handle); 835 } 836 if (client == NULL) 837 goto regular_rpcbind; /* Go the regular way */ 838 } else { 839 /* This is a UDP PORTMAP handle. Change to version 4 */ 840 vers = RPCBVERS4; 841 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 842 } 843 /* 844 * We also send the remote system the address we used to 845 * contact it in case it can help it connect back with us 846 */ 847 if (parms.r_addr == NULL) { 848 /*LINTED const castaway*/ 849 parms.r_addr = (char *) &nullstring[0]; /* for XDRing */ 850 } 851 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDRLIST, 852 (xdrproc_t) xdr_rpcb, (char *)(void *)&parms, 853 (xdrproc_t) xdr_rpcb_entry_list_ptr, 854 (char *)(void *)&relp, tottimeout); 855 if (clnt_st == RPC_SUCCESS) { 856 if ((address = got_entry(relp, nconf)) != NULL) { 857 xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr, 858 (char *)(void *)&relp); 859 goto done; 860 } 861 /* Entry not found for this transport */ 862 xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr, 863 (char *)(void *)&relp); 864 /* 865 * XXX: should have perhaps returned with error but 866 * since the remote machine might not always be able 867 * to send the address on all transports, we try the 868 * regular way with regular_rpcbind 869 */ 870 goto regular_rpcbind; 871 } else if ((clnt_st == RPC_PROGVERSMISMATCH) || 872 (clnt_st == RPC_PROGUNAVAIL)) { 873 start_vers = RPCBVERS; /* Try version 3 now */ 874 goto regular_rpcbind; /* Try different versions */ 875 } else { 876 rpc_createerr.cf_stat = RPC_PMAPFAILURE; 877 clnt_geterr(client, &rpc_createerr.cf_error); 878 goto error; 879 } 880 } 881 882 regular_rpcbind: 883 884 /* Now the same transport is to be used to get the address */ 885 #if 1 886 if (client && ((nconf->nc_semantics == NC_TPI_COTS_ORD) || 887 (nconf->nc_semantics == NC_TPI_COTS))) 888 #else 889 if (client && nconf->nc_semantics == NC_TPI_CLTS) 890 #endif 891 { 892 /* A CLTS type of client - destroy it */ 893 CLNT_DESTROY(client); 894 client = NULL; 895 } 896 897 if (client == NULL) { 898 client = getclnthandle(host, nconf, &parms.r_addr); 899 if (client == NULL) { 900 goto error; 901 } 902 } 903 if (parms.r_addr == NULL) { 904 /*LINTED const castaway*/ 905 parms.r_addr = (char *) &nullstring[0]; 906 } 907 908 /* First try from start_vers and then version 3 (RPCBVERS) */ 909 for (vers = start_vers; vers >= RPCBVERS; vers--) { 910 /* Set the version */ 911 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 912 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDR, 913 (xdrproc_t) xdr_rpcb, (char *)(void *)&parms, 914 (xdrproc_t) xdr_wrapstring, (char *)(void *) &ua, 915 tottimeout); 916 if (clnt_st == RPC_SUCCESS) { 917 if ((ua == NULL) || (ua[0] == NULL)) { 918 /* address unknown */ 919 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 920 goto error; 921 } 922 address = uaddr2taddr(nconf, ua); 923 #ifdef ND_DEBUG 924 fprintf(stderr, "\tRemote address is [%s]\n", ua); 925 if (!address) 926 fprintf(stderr, 927 "\tCouldn't resolve remote address!\n"); 928 #endif 929 xdr_free((xdrproc_t)xdr_wrapstring, 930 (char *)(void *)&ua); 931 932 if (! address) { 933 /* We don't know about your universal address */ 934 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE; 935 goto error; 936 } 937 CLNT_CONTROL(client, CLGET_SVC_ADDR, 938 (char *)(void *)&servaddr); 939 __rpc_fixup_addr(address, &servaddr); 940 goto done; 941 } else if (clnt_st == RPC_PROGVERSMISMATCH) { 942 struct rpc_err rpcerr; 943 944 clnt_geterr(client, &rpcerr); 945 if (rpcerr.re_vers.low > RPCBVERS4) 946 goto error; /* a new version, can't handle */ 947 } else if (clnt_st != RPC_PROGUNAVAIL) { 948 /* Cant handle this error */ 949 rpc_createerr.cf_stat = clnt_st; 950 clnt_geterr(client, &rpc_createerr.cf_error); 951 goto error; 952 } 953 } 954 955 if ((address == NULL) || (address->len == 0)) { 956 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 957 clnt_geterr(client, &rpc_createerr.cf_error); 958 } 959 960 error: 961 if (client) { 962 CLNT_DESTROY(client); 963 client = NULL; 964 } 965 done: 966 if (nconf->nc_semantics != NC_TPI_CLTS) { 967 /* This client is the connectionless one */ 968 if (client) { 969 CLNT_DESTROY(client); 970 client = NULL; 971 } 972 } 973 if (clpp) { 974 *clpp = client; 975 } else if (client) { 976 CLNT_DESTROY(client); 977 } 978 return (address); 979 } 980 981 982 /* 983 * Find the mapped address for program, version. 984 * Calls the rpcbind service remotely to do the lookup. 985 * Uses the transport specified in nconf. 986 * Returns FALSE (0) if no map exists, else returns 1. 987 * 988 * Assuming that the address is all properly allocated 989 */ 990 int 991 rpcb_getaddr(program, version, nconf, address, host) 992 rpcprog_t program; 993 rpcvers_t version; 994 const struct netconfig *nconf; 995 struct netbuf *address; 996 const char *host; 997 { 998 struct netbuf *na; 999 1000 _DIAGASSERT(address != NULL); 1001 1002 if ((na = __rpcb_findaddr(program, version, nconf, 1003 host, (CLIENT **) NULL)) == NULL) 1004 return (FALSE); 1005 1006 if (na->len > address->maxlen) { 1007 /* Too long address */ 1008 free(na->buf); 1009 free(na); 1010 rpc_createerr.cf_stat = RPC_FAILED; 1011 return (FALSE); 1012 } 1013 memcpy(address->buf, na->buf, (size_t)na->len); 1014 address->len = na->len; 1015 free(na->buf); 1016 free(na); 1017 return (TRUE); 1018 } 1019 1020 /* 1021 * Get a copy of the current maps. 1022 * Calls the rpcbind service remotely to get the maps. 1023 * 1024 * It returns only a list of the services 1025 * It returns NULL on failure. 1026 */ 1027 rpcblist * 1028 rpcb_getmaps(nconf, host) 1029 const struct netconfig *nconf; 1030 const char *host; 1031 { 1032 rpcblist_ptr head = NULL; 1033 CLIENT *client; 1034 enum clnt_stat clnt_st; 1035 rpcvers_t vers = 0; 1036 1037 client = getclnthandle(host, nconf, NULL); 1038 if (client == NULL) { 1039 return (head); 1040 } 1041 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP, 1042 (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr, 1043 (char *)(void *)&head, tottimeout); 1044 if (clnt_st == RPC_SUCCESS) 1045 goto done; 1046 1047 if ((clnt_st != RPC_PROGVERSMISMATCH) && 1048 (clnt_st != RPC_PROGUNAVAIL)) { 1049 rpc_createerr.cf_stat = RPC_RPCBFAILURE; 1050 clnt_geterr(client, &rpc_createerr.cf_error); 1051 goto done; 1052 } 1053 1054 /* fall back to earlier version */ 1055 CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers); 1056 if (vers == RPCBVERS4) { 1057 vers = RPCBVERS; 1058 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 1059 if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP, 1060 (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr, 1061 (char *)(void *)&head, tottimeout) == RPC_SUCCESS) 1062 goto done; 1063 } 1064 rpc_createerr.cf_stat = RPC_RPCBFAILURE; 1065 clnt_geterr(client, &rpc_createerr.cf_error); 1066 1067 done: 1068 CLNT_DESTROY(client); 1069 return (head); 1070 } 1071 1072 /* 1073 * rpcbinder remote-call-service interface. 1074 * This routine is used to call the rpcbind remote call service 1075 * which will look up a service program in the address maps, and then 1076 * remotely call that routine with the given parameters. This allows 1077 * programs to do a lookup and call in one step. 1078 */ 1079 enum clnt_stat 1080 rpcb_rmtcall(nconf, host, prog, vers, proc, xdrargs, argsp, 1081 xdrres, resp, tout, addr_ptr) 1082 const struct netconfig *nconf; /* Netconfig structure */ 1083 const char *host; /* Remote host name */ 1084 rpcprog_t prog; 1085 rpcvers_t vers; 1086 rpcproc_t proc; /* Remote proc identifiers */ 1087 xdrproc_t xdrargs, xdrres; /* XDR routines */ 1088 caddr_t argsp, resp; /* Argument and Result */ 1089 struct timeval tout; /* Timeout value for this call */ 1090 const struct netbuf *addr_ptr; /* Preallocated netbuf address */ 1091 { 1092 CLIENT *client; 1093 enum clnt_stat stat; 1094 struct r_rpcb_rmtcallargs a; 1095 struct r_rpcb_rmtcallres r; 1096 rpcvers_t rpcb_vers; 1097 1098 client = getclnthandle(host, nconf, NULL); 1099 if (client == NULL) { 1100 return (RPC_FAILED); 1101 } 1102 /*LINTED const castaway*/ 1103 CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *)(void *)&rmttimeout); 1104 a.prog = prog; 1105 a.vers = vers; 1106 a.proc = proc; 1107 a.args.args_val = argsp; 1108 a.xdr_args = xdrargs; 1109 r.addr = NULL; 1110 r.results.results_val = resp; 1111 r.xdr_res = xdrres; 1112 1113 for (rpcb_vers = RPCBVERS4; rpcb_vers >= RPCBVERS; rpcb_vers--) { 1114 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&rpcb_vers); 1115 stat = CLNT_CALL(client, (rpcproc_t)RPCBPROC_CALLIT, 1116 (xdrproc_t) xdr_rpcb_rmtcallargs, (char *)(void *)&a, 1117 (xdrproc_t) xdr_rpcb_rmtcallres, (char *)(void *)&r, tout); 1118 if ((stat == RPC_SUCCESS) && (addr_ptr != NULL)) { 1119 struct netbuf *na; 1120 /*LINTED const castaway*/ 1121 na = uaddr2taddr((struct netconfig *) nconf, r.addr); 1122 if (!na) { 1123 stat = RPC_N2AXLATEFAILURE; 1124 /*LINTED const castaway*/ 1125 ((struct netbuf *) addr_ptr)->len = 0; 1126 goto error; 1127 } 1128 if (na->len > addr_ptr->maxlen) { 1129 /* Too long address */ 1130 stat = RPC_FAILED; /* XXX A better error no */ 1131 free(na->buf); 1132 free(na); 1133 /*LINTED const castaway*/ 1134 ((struct netbuf *) addr_ptr)->len = 0; 1135 goto error; 1136 } 1137 memcpy(addr_ptr->buf, na->buf, (size_t)na->len); 1138 /*LINTED const castaway*/ 1139 ((struct netbuf *)addr_ptr)->len = na->len; 1140 free(na->buf); 1141 free(na); 1142 break; 1143 } else if ((stat != RPC_PROGVERSMISMATCH) && 1144 (stat != RPC_PROGUNAVAIL)) { 1145 goto error; 1146 } 1147 } 1148 error: 1149 CLNT_DESTROY(client); 1150 if (r.addr) 1151 xdr_free((xdrproc_t) xdr_wrapstring, (char *)(void *)&r.addr); 1152 return (stat); 1153 } 1154 1155 /* 1156 * Gets the time on the remote host. 1157 * Returns 1 if succeeds else 0. 1158 */ 1159 bool_t 1160 rpcb_gettime(host, timep) 1161 const char *host; 1162 time_t *timep; 1163 { 1164 CLIENT *client = NULL; 1165 void *handle; 1166 struct netconfig *nconf; 1167 rpcvers_t vers; 1168 enum clnt_stat st; 1169 1170 1171 if ((host == NULL) || (host[0] == NULL)) { 1172 time(timep); 1173 return (TRUE); 1174 } 1175 1176 if ((handle = __rpc_setconf("netpath")) == NULL) { 1177 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1178 return (FALSE); 1179 } 1180 rpc_createerr.cf_stat = RPC_SUCCESS; 1181 while (client == NULL) { 1182 if ((nconf = __rpc_getconf(handle)) == NULL) { 1183 if (rpc_createerr.cf_stat == RPC_SUCCESS) 1184 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1185 break; 1186 } 1187 client = getclnthandle(host, nconf, NULL); 1188 if (client) 1189 break; 1190 } 1191 __rpc_endconf(handle); 1192 if (client == (CLIENT *) NULL) { 1193 return (FALSE); 1194 } 1195 1196 st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME, 1197 (xdrproc_t) xdr_void, NULL, 1198 (xdrproc_t) xdr_int, (char *)(void *)timep, tottimeout); 1199 1200 if ((st == RPC_PROGVERSMISMATCH) || (st == RPC_PROGUNAVAIL)) { 1201 CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers); 1202 if (vers == RPCBVERS4) { 1203 /* fall back to earlier version */ 1204 vers = RPCBVERS; 1205 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 1206 st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME, 1207 (xdrproc_t) xdr_void, NULL, 1208 (xdrproc_t) xdr_int, (char *)(void *)timep, 1209 tottimeout); 1210 } 1211 } 1212 CLNT_DESTROY(client); 1213 return (st == RPC_SUCCESS? TRUE: FALSE); 1214 } 1215 1216 /* 1217 * Converts taddr to universal address. This routine should never 1218 * really be called because local n2a libraries are always provided. 1219 */ 1220 char * 1221 rpcb_taddr2uaddr(nconf, taddr) 1222 struct netconfig *nconf; 1223 struct netbuf *taddr; 1224 { 1225 CLIENT *client; 1226 char *uaddr = NULL; 1227 1228 1229 /* parameter checking */ 1230 if (nconf == NULL) { 1231 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1232 return (NULL); 1233 } 1234 if (taddr == NULL) { 1235 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 1236 return (NULL); 1237 } 1238 client = local_rpcb(); 1239 if (! client) { 1240 return (NULL); 1241 } 1242 1243 CLNT_CALL(client, (rpcproc_t)RPCBPROC_TADDR2UADDR, 1244 (xdrproc_t) xdr_netbuf, (char *)(void *)taddr, 1245 (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr, tottimeout); 1246 CLNT_DESTROY(client); 1247 return (uaddr); 1248 } 1249 1250 /* 1251 * Converts universal address to netbuf. This routine should never 1252 * really be called because local n2a libraries are always provided. 1253 */ 1254 struct netbuf * 1255 rpcb_uaddr2taddr(nconf, uaddr) 1256 struct netconfig *nconf; 1257 char *uaddr; 1258 { 1259 CLIENT *client; 1260 struct netbuf *taddr; 1261 1262 1263 /* parameter checking */ 1264 if (nconf == NULL) { 1265 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1266 return (NULL); 1267 } 1268 if (uaddr == NULL) { 1269 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 1270 return (NULL); 1271 } 1272 client = local_rpcb(); 1273 if (! client) { 1274 return (NULL); 1275 } 1276 1277 taddr = (struct netbuf *)calloc(1, sizeof (struct netbuf)); 1278 if (taddr == NULL) { 1279 CLNT_DESTROY(client); 1280 return (NULL); 1281 } 1282 if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_UADDR2TADDR, 1283 (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr, 1284 (xdrproc_t) xdr_netbuf, (char *)(void *)taddr, 1285 tottimeout) != RPC_SUCCESS) { 1286 free(taddr); 1287 taddr = NULL; 1288 } 1289 CLNT_DESTROY(client); 1290 return (taddr); 1291 } 1292
Indexes created Sun Sep 21 20:09:37 GMT 2025