lib/libc/rpc/rpcb_clnt.c

   1 /*
   2  * The contents of this file are subject to the Sun Standards
   3  * License Version 1.0 the (the "License";) You may not use
   4  * this file except in compliance with the License.  You may
   5  * obtain a copy of the License at lib/libc/rpc/LICENSE
   6  *
   7  * Software distributed under the License is distributed on
   8  * an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either
   9  * express or implied.  See the License for the specific
  10  * language governing rights and limitations under the License.
  11  *
  12  * The Original Code is Copyright 1998 by Sun Microsystems, Inc
  13  *
  14  * The Initial Developer of the Original Code is:  Sun
  15  * Microsystems, Inc.
  16  *
  17  * All Rights Reserved.
  18  *
  19  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
  20  * unrestricted use provided that this legend is included on all tape
  21  * media and as a part of the software program in whole or part.  Users
  22  * may copy or modify Sun RPC without charge, but are not authorized
  23  * to license or distribute it to anyone else except as part of a product or
  24  * program developed by the user.
  25  *
  26  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  27  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  28  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  29  *
  30  * Sun RPC is provided with no support and without any obligation on the
  31  * part of Sun Microsystems, Inc. to assist in its use, correction,
  32  * modification or enhancement.
  33  *
  34  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  35  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  36  * OR ANY PART THEREOF.
  37  *
  38  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  39  * or profits or other special, indirect and consequential damages, even if
  40  * Sun has been advised of the possibility of such damages.
  41  *
  42  * Sun Microsystems, Inc.
  43  * 2550 Garcia Avenue
  44  * Mountain View, California  94043
  45  * @(#)rpcb_clnt.c      1.27    94/04/24 SMI; 1.30 89/06/21 Copyr 1988 Sun Micro
  46  * $NetBSD: rpcb_clnt.c,v 1.6 2000/07/16 06:41:43 itojun Exp $
  47  * $FreeBSD: src/lib/libc/rpc/rpcb_clnt.c,v 1.17 2007/09/20 22:35:24 matteo Exp $
  48  * $DragonFly$
  49  */
  50 /*
  51  * Copyright (c) 1986-1991 by Sun Microsystems Inc.
  52  */
  53
  54 /*
  55  * rpcb_clnt.c
  56  * interface to rpcbind rpc service.
  57  *
  58  * Copyright (C) 1988, Sun Microsystems, Inc.
  59  */
  60
  61 #include "namespace.h"
  62 #include "reentrant.h"
  63 #include <sys/types.h>
  64 #include <sys/socket.h>
  65 #include <sys/un.h>
  66 #include <sys/utsname.h>
  67 #include <rpc/rpc.h>
  68 #include <rpc/rpcb_prot.h>
  69 #include <rpc/nettype.h>
  70 #include <netconfig.h>
  71 #ifdef PORTMAP
  72 #include <netinet/in.h>         /* FOR IPPROTO_TCP/UDP definitions */
  73 #include <rpc/pmap_prot.h>
  74 #endif                          /* PORTMAP */
  75 #include <stdio.h>
  76 #include <errno.h>
  77 #include <stdlib.h>
  78 #include <string.h>
  79 #include <unistd.h>
  80 #include <netdb.h>
  81 #include <syslog.h>
  82 #include "un-namespace.h"
  83
  84 #include "rpc_com.h"
  85 #include "mt_misc.h"
  86
  87 static struct timeval tottimeout = { 60, 0 };
  88 static const struct timeval rmttimeout = { 3, 0 };
  89 static struct timeval rpcbrmttime = { 15, 0 };
  90
  91 extern bool_t xdr_wrapstring(XDR *, char **);
  92
  93 static const char nullstring[] = "\000";
  94
  95 #define CACHESIZE 6
  96
  97 struct address_cache {
  98         char *ac_host;
  99         char *ac_netid;
 100         char *ac_uaddr;
 101         struct netbuf *ac_taddr;
 102         struct address_cache *ac_next;
 103 };
 104
 105 static struct address_cache *front;
 106 static int cachesize;
 107
 108 #define CLCR_GET_RPCB_TIMEOUT   1
 109 #define CLCR_SET_RPCB_TIMEOUT   2
 110
 111
 112 extern int __rpc_lowvers;
 113
 114 static struct address_cache *check_cache(const char *, const char *);
 115 static void delete_cache(struct netbuf *);
 116 static void add_cache(const char *, const char *, struct netbuf *, char *);
 117 static CLIENT *getclnthandle(const char *, const struct netconfig *, char **);
 118 static CLIENT *local_rpcb(void);
 119 static struct netbuf *got_entry(rpcb_entry_list_ptr, const struct netconfig *);
 120
 121 /*
 122  * This routine adjusts the timeout used for calls to the remote rpcbind.
 123  * Also, this routine can be used to set the use of portmapper version 2
 124  * only when doing rpc_broadcasts
 125  * These are private routines that may not be provided in future releases.
 126  */
 127 bool_t
 128 __rpc_control(int request, 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
 161 /*
 162  * The routines check_cache(), add_cache(), delete_cache() manage the
 163  * cache of rpcbind addresses for (host, netid).
 164  */
 165
 166 static struct address_cache *
 167 check_cache(const char *host, const char *netid)
 168 {
 169         struct address_cache *cptr;
 170
 171         /* READ LOCK HELD ON ENTRY: rpcbaddr_cache_lock */
 172
 173         for (cptr = front; cptr != NULL; cptr = cptr->ac_next) {
 174                 if (!strcmp(cptr->ac_host, host) &&
 175                     !strcmp(cptr->ac_netid, netid)) {
 176 #ifdef ND_DEBUG
 177                         fprintf(stderr, "Found cache entry for %s: %s\n",
 178                                 host, netid);
 179 #endif
 180                         return (cptr);
 181                 }
 182         }
 183         return ((struct address_cache *) NULL);
 184 }
 185
 186 static void
 187 delete_cache(struct netbuf *addr)
 188 {
 189         struct address_cache *cptr, *prevptr = NULL;
 190
 191         /* WRITE LOCK HELD ON ENTRY: rpcbaddr_cache_lock */
 192         for (cptr = front; cptr != NULL; cptr = cptr->ac_next) {
 193                 if (!memcmp(cptr->ac_taddr->buf, addr->buf, addr->len)) {
 194                         free(cptr->ac_host);
 195                         free(cptr->ac_netid);
 196                         free(cptr->ac_taddr->buf);
 197                         free(cptr->ac_taddr);
 198                         if (cptr->ac_uaddr)
 199                                 free(cptr->ac_uaddr);
 200                         if (prevptr)
 201                                 prevptr->ac_next = cptr->ac_next;
 202                         else
 203                                 front = cptr->ac_next;
 204                         free(cptr);
 205                         cachesize--;
 206                         break;
 207                 }
 208                 prevptr = cptr;
 209         }
 210 }
 211
 212 static void
 213 add_cache(const char *host, const char *netid, struct netbuf *taddr,
 214           char *uaddr)
 215 {
 216         struct address_cache  *ad_cache, *cptr, *prevptr;
 217
 218         ad_cache = (struct address_cache *)
 219                         malloc(sizeof (struct address_cache));
 220         if (!ad_cache) {
 221                 return;
 222         }
 223         ad_cache->ac_host = strdup(host);
 224         ad_cache->ac_netid = strdup(netid);
 225         ad_cache->ac_uaddr = uaddr ? strdup(uaddr) : NULL;
 226         ad_cache->ac_taddr = (struct netbuf *)malloc(sizeof (struct netbuf));
 227         if (!ad_cache->ac_host || !ad_cache->ac_netid || !ad_cache->ac_taddr ||
 228                 (uaddr && !ad_cache->ac_uaddr)) {
 229                 goto out;
 230         }
 231         ad_cache->ac_taddr->len = ad_cache->ac_taddr->maxlen = taddr->len;
 232         ad_cache->ac_taddr->buf = (char *) malloc(taddr->len);
 233         if (ad_cache->ac_taddr->buf == NULL) {
 234 out:
 235                 if (ad_cache->ac_host)
 236                         free(ad_cache->ac_host);
 237                 if (ad_cache->ac_netid)
 238                         free(ad_cache->ac_netid);
 239                 if (ad_cache->ac_uaddr)
 240                         free(ad_cache->ac_uaddr);
 241                 if (ad_cache->ac_taddr)
 242                         free(ad_cache->ac_taddr);
 243                 free(ad_cache);
 244                 return;
 245         }
 246         memcpy(ad_cache->ac_taddr->buf, taddr->buf, taddr->len);
 247 #ifdef ND_DEBUG
 248         fprintf(stderr, "Added to cache: %s : %s\n", host, netid);
 249 #endif
 250
 251 /* VARIABLES PROTECTED BY rpcbaddr_cache_lock:  cptr */
 252
 253         rwlock_wrlock(&rpcbaddr_cache_lock);
 254         if (cachesize < CACHESIZE) {
 255                 ad_cache->ac_next = front;
 256                 front = ad_cache;
 257                 cachesize++;
 258         } else {
 259                 /* Free the last entry */
 260                 cptr = front;
 261                 prevptr = NULL;
 262                 while (cptr->ac_next) {
 263                         prevptr = cptr;
 264                         cptr = cptr->ac_next;
 265                 }
 266
 267 #ifdef ND_DEBUG
 268                 fprintf(stderr, "Deleted from cache: %s : %s\n",
 269                         cptr->ac_host, cptr->ac_netid);
 270 #endif
 271                 free(cptr->ac_host);
 272                 free(cptr->ac_netid);
 273                 free(cptr->ac_taddr->buf);
 274                 free(cptr->ac_taddr);
 275                 if (cptr->ac_uaddr)
 276                         free(cptr->ac_uaddr);
 277
 278                 if (prevptr) {
 279                         prevptr->ac_next = NULL;
 280                         ad_cache->ac_next = front;
 281                         front = ad_cache;
 282                 } else {
 283                         front = ad_cache;
 284                         ad_cache->ac_next = NULL;
 285                 }
 286                 free(cptr);
 287         }
 288         rwlock_unlock(&rpcbaddr_cache_lock);
 289 }
 290
 291 /*
 292  * This routine will return a client handle that is connected to the
 293  * rpcbind. If targaddr is non-NULL, the "universal address" of the
 294  * host will be stored in *targaddr; the caller is responsible for
 295  * freeing this string.
 296  * On error, returns NULL and free's everything.
 297  */
 298 static CLIENT *
 299 getclnthandle(const char *host, const struct netconfig *nconf, char **targaddr)
 300 {
 301         CLIENT *client;
 302         struct netbuf *addr, taddr;
 303         struct netbuf addr_to_delete;
 304         struct __rpc_sockinfo si;
 305         struct addrinfo hints, *res, *tres;
 306         struct address_cache *ad_cache;
 307         char *tmpaddr;
 308
 309 /* VARIABLES PROTECTED BY rpcbaddr_cache_lock:  ad_cache */
 310
 311         /* Get the address of the rpcbind.  Check cache first */
 312         client = NULL;
 313         addr_to_delete.len = 0;
 314         rwlock_rdlock(&rpcbaddr_cache_lock);
 315         ad_cache = NULL;
 316         if (host != NULL)
 317                 ad_cache = check_cache(host, nconf->nc_netid);
 318         if (ad_cache != NULL) {
 319                 addr = ad_cache->ac_taddr;
 320                 client = clnt_tli_create(RPC_ANYFD, nconf, addr,
 321                     (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0);
 322                 if (client != NULL) {
 323                         if (targaddr)
 324                                 *targaddr = strdup(ad_cache->ac_uaddr);
 325                         rwlock_unlock(&rpcbaddr_cache_lock);
 326                         return (client);
 327                 }
 328                 addr_to_delete.len = addr->len;
 329                 addr_to_delete.buf = (char *)malloc(addr->len);
 330                 if (addr_to_delete.buf == NULL) {
 331                         addr_to_delete.len = 0;
 332                 } else {
 333                         memcpy(addr_to_delete.buf, addr->buf, addr->len);
 334                 }
 335         }
 336         rwlock_unlock(&rpcbaddr_cache_lock);
 337         if (addr_to_delete.len != 0) {
 338                 /*
 339                  * Assume this may be due to cache data being
 340                  *  outdated
 341                  */
 342                 rwlock_wrlock(&rpcbaddr_cache_lock);
 343                 delete_cache(&addr_to_delete);
 344                 rwlock_unlock(&rpcbaddr_cache_lock);
 345                 free(addr_to_delete.buf);
 346         }
 347         if (!__rpc_nconf2sockinfo(nconf, &si)) {
 348                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 349                 return NULL;
 350         }
 351
 352         memset(&hints, 0, sizeof hints);
 353         hints.ai_family = si.si_af;
 354         hints.ai_socktype = si.si_socktype;
 355         hints.ai_protocol = si.si_proto;
 356
 357 #ifdef CLNT_DEBUG
 358         printf("trying netid %s family %d proto %d socktype %d\n",
 359             nconf->nc_netid, si.si_af, si.si_proto, si.si_socktype);
 360 #endif
 361
 362         if (nconf->nc_protofmly != NULL && strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) {
 363                 client = local_rpcb();
 364                 if (! client) {
 365 #ifdef ND_DEBUG
 366                         clnt_pcreateerror("rpcbind clnt interface");
 367 #endif
 368                         return (NULL);
 369                 } else {
 370                         struct sockaddr_un sun;
 371                         if (targaddr) {
 372                             *targaddr = malloc(sizeof(sun.sun_path));
 373                             if (*targaddr == NULL) {
 374                                 CLNT_DESTROY(client);
 375                                 return (NULL);
 376                             }
 377                             strncpy(*targaddr, _PATH_RPCBINDSOCK,
 378                                 sizeof(sun.sun_path));
 379                         }
 380                         return (client);
 381                 }
 382         } else {
 383                 if (getaddrinfo(host, "sunrpc", &hints, &res) != 0) {
 384                         rpc_createerr.cf_stat = RPC_UNKNOWNHOST;
 385                         return NULL;
 386                 }
 387         }
 388
 389         for (tres = res; tres != NULL; tres = tres->ai_next) {
 390                 taddr.buf = tres->ai_addr;
 391                 taddr.len = taddr.maxlen = tres->ai_addrlen;
 392
 393 #ifdef ND_DEBUG
 394                 {
 395                         char *ua;
 396
 397                         ua = taddr2uaddr(nconf, &taddr);
 398                         fprintf(stderr, "Got it [%s]\n", ua);
 399                         free(ua);
 400                 }
 401 #endif
 402
 403 #ifdef ND_DEBUG
 404                 {
 405                         int i;
 406
 407                         fprintf(stderr, "\tnetbuf len = %d, maxlen = %d\n",
 408                                 taddr.len, taddr.maxlen);
 409                         fprintf(stderr, "\tAddress is ");
 410                         for (i = 0; i < taddr.len; i++)
 411                                 fprintf(stderr, "%u.", ((char *)(taddr.buf))[i]);
 412                         fprintf(stderr, "\n");
 413                 }
 414 #endif
 415                 client = clnt_tli_create(RPC_ANYFD, nconf, &taddr,
 416                     (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0);
 417 #ifdef ND_DEBUG
 418                 if (! client) {
 419                         clnt_pcreateerror("rpcbind clnt interface");
 420                 }
 421 #endif
 422
 423                 if (client) {
 424                         tmpaddr = targaddr ? taddr2uaddr(nconf, &taddr) : NULL;
 425                         add_cache(host, nconf->nc_netid, &taddr, tmpaddr);
 426                         if (targaddr)
 427                                 *targaddr = tmpaddr;
 428                         break;
 429                 }
 430         }
 431         if (res)
 432                 freeaddrinfo(res);
 433         return (client);
 434 }
 435
 436 /* XXX */
 437 #define IN4_LOCALHOST_STRING    "127.0.0.1"
 438 #define IN6_LOCALHOST_STRING    "::1"
 439
 440 /*
 441  * This routine will return a client handle that is connected to the local
 442  * rpcbind. Returns NULL on error and free's everything.
 443  */
 444 static CLIENT *
 445 local_rpcb(void)
 446 {
 447         CLIENT *client;
 448         static struct netconfig *loopnconf;
 449         static char *hostname;
 450         int sock;
 451         size_t tsize;
 452         struct netbuf nbuf;
 453         struct sockaddr_un sun;
 454
 455         /*
 456          * Try connecting to the local rpcbind through a local socket
 457          * first. If this doesn't work, try all transports defined in
 458          * the netconfig file.
 459          */
 460         memset(&sun, 0, sizeof sun);
 461         sock = _socket(AF_LOCAL, SOCK_STREAM, 0);
 462         if (sock < 0)
 463                 goto try_nconf;
 464         sun.sun_family = AF_LOCAL;
 465         strcpy(sun.sun_path, _PATH_RPCBINDSOCK);
 466         nbuf.len = sun.sun_len = SUN_LEN(&sun);
 467         nbuf.maxlen = sizeof (struct sockaddr_un);
 468         nbuf.buf = &sun;
 469
 470         tsize = __rpc_get_t_size(AF_LOCAL, 0, 0);
 471         client = clnt_vc_create(sock, &nbuf, (rpcprog_t)RPCBPROG,
 472             (rpcvers_t)RPCBVERS, tsize, tsize);
 473
 474         if (client != NULL) {
 475                 /* Mark the socket to be closed in destructor */
 476                 CLNT_CONTROL(client, CLSET_FD_CLOSE, NULL);
 477                 return client;
 478         }
 479
 480         /* Nobody needs this socket anymore; free the descriptor. */
 481         _close(sock);
 482
 483 try_nconf:
 484
 485 /* VARIABLES PROTECTED BY loopnconf_lock: loopnconf */
 486         mutex_lock(&loopnconf_lock);
 487         if (loopnconf == NULL) {
 488                 struct netconfig *nconf, *tmpnconf = NULL;
 489                 void *nc_handle;
 490                 int fd;
 491
 492                 nc_handle = setnetconfig();
 493                 if (nc_handle == NULL) {
 494                         /* fails to open netconfig file */
 495                         syslog (LOG_ERR, "rpc: failed to open " NETCONFIG);
 496                         rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 497                         mutex_unlock(&loopnconf_lock);
 498                         return (NULL);
 499                 }
 500                 while ((nconf = getnetconfig(nc_handle)) != NULL) {
 501 #ifdef INET6
 502                         if ((strcmp(nconf->nc_protofmly, NC_INET6) == 0 ||
 503 #else
 504                         if ((
 505 #endif
 506                              strcmp(nconf->nc_protofmly, NC_INET) == 0) &&
 507                             (nconf->nc_semantics == NC_TPI_COTS ||
 508                              nconf->nc_semantics == NC_TPI_COTS_ORD)) {
 509                                 fd = __rpc_nconf2fd(nconf);
 510                                 /*
 511                                  * Can't create a socket, assume that
 512                                  * this family isn't configured in the kernel.
 513                                  */
 514                                 if (fd < 0)
 515                                         continue;
 516                                 _close(fd);
 517                                 tmpnconf = nconf;
 518                                 if (!strcmp(nconf->nc_protofmly, NC_INET))
 519                                         hostname = IN4_LOCALHOST_STRING;
 520                                 else
 521                                         hostname = IN6_LOCALHOST_STRING;
 522                         }
 523                 }
 524                 if (tmpnconf == NULL) {
 525                         rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 526                         mutex_unlock(&loopnconf_lock);
 527                         return (NULL);
 528                 }
 529                 loopnconf = getnetconfigent(tmpnconf->nc_netid);
 530                 /* loopnconf is never freed */
 531                 endnetconfig(nc_handle);
 532         }
 533         mutex_unlock(&loopnconf_lock);
 534         client = getclnthandle(hostname, loopnconf, NULL);
 535         return (client);
 536 }
 537
 538 /*
 539  * Set a mapping between program, version and address.
 540  * Calls the rpcbind service to do the mapping.
 541  */
 542 bool_t
 543 rpcb_set(rpcprog_t program, rpcvers_t version,
 544          const struct netconfig *nconf, /* Network structure of transport */
 545          const struct netbuf *address)  /* Services netconfig address */
 546 {
 547         CLIENT *client;
 548         bool_t rslt = FALSE;
 549         RPCB parms;
 550         char uidbuf[32];
 551
 552         /* parameter checking */
 553         if (nconf == NULL) {
 554                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 555                 return (FALSE);
 556         }
 557         if (address == NULL) {
 558                 rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
 559                 return (FALSE);
 560         }
 561         client = local_rpcb();
 562         if (! client) {
 563                 return (FALSE);
 564         }
 565
 566         /* convert to universal */
 567         /*LINTED const castaway*/
 568         parms.r_addr = taddr2uaddr((struct netconfig *) nconf,
 569                                    (struct netbuf *)address);
 570         if (!parms.r_addr) {
 571                 CLNT_DESTROY(client);
 572                 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE;
 573                 return (FALSE); /* no universal address */
 574         }
 575         parms.r_prog = program;
 576         parms.r_vers = version;
 577         parms.r_netid = nconf->nc_netid;
 578         /*
 579          * Though uid is not being used directly, we still send it for
 580          * completeness.  For non-unix platforms, perhaps some other
 581          * string or an empty string can be sent.
 582          */
 583         snprintf(uidbuf, sizeof uidbuf, "%d", geteuid());
 584         parms.r_owner = uidbuf;
 585
 586         CLNT_CALL(client, (rpcproc_t)RPCBPROC_SET, (xdrproc_t) xdr_rpcb,
 587             (char *)(void *)&parms, (xdrproc_t) xdr_bool,
 588             (char *)(void *)&rslt, tottimeout);
 589
 590         CLNT_DESTROY(client);
 591         free(parms.r_addr);
 592         return (rslt);
 593 }
 594
 595 /*
 596  * Remove the mapping between program, version and netbuf address.
 597  * Calls the rpcbind service to do the un-mapping.
 598  * If netbuf is NULL, unset for all the transports, otherwise unset
 599  * only for the given transport.
 600  */
 601 bool_t
 602 rpcb_unset(rpcprog_t program, rpcvers_t version, const struct netconfig *nconf)
 603 {
 604         CLIENT *client;
 605         bool_t rslt = FALSE;
 606         RPCB parms;
 607         char uidbuf[32];
 608
 609         client = local_rpcb();
 610         if (! client) {
 611                 return (FALSE);
 612         }
 613
 614         parms.r_prog = program;
 615         parms.r_vers = version;
 616         if (nconf)
 617                 parms.r_netid = nconf->nc_netid;
 618         else {
 619                 /*LINTED const castaway*/
 620                 parms.r_netid = (char *) &nullstring[0]; /* unsets  all */
 621         }
 622         /*LINTED const castaway*/
 623         parms.r_addr = (char *) &nullstring[0];
 624         snprintf(uidbuf, sizeof uidbuf, "%d", geteuid());
 625         parms.r_owner = uidbuf;
 626
 627         CLNT_CALL(client, (rpcproc_t)RPCBPROC_UNSET, (xdrproc_t) xdr_rpcb,
 628             (char *)(void *)&parms, (xdrproc_t) xdr_bool,
 629             (char *)(void *)&rslt, tottimeout);
 630
 631         CLNT_DESTROY(client);
 632         return (rslt);
 633 }
 634
 635 /*
 636  * From the merged list, find the appropriate entry
 637  */
 638 static struct netbuf *
 639 got_entry(rpcb_entry_list_ptr relp, const struct netconfig *nconf)
 640 {
 641         struct netbuf *na = NULL;
 642         rpcb_entry_list_ptr sp;
 643         rpcb_entry *rmap;
 644
 645         for (sp = relp; sp != NULL; sp = sp->rpcb_entry_next) {
 646                 rmap = &sp->rpcb_entry_map;
 647                 if ((strcmp(nconf->nc_proto, rmap->r_nc_proto) == 0) &&
 648                     (strcmp(nconf->nc_protofmly, rmap->r_nc_protofmly) == 0) &&
 649                     (nconf->nc_semantics == rmap->r_nc_semantics) &&
 650                     (rmap->r_maddr != NULL) && (rmap->r_maddr[0] != 0)) {
 651                         na = uaddr2taddr(nconf, rmap->r_maddr);
 652 #ifdef ND_DEBUG
 653                         fprintf(stderr, "\tRemote address is [%s].\n",
 654                                 rmap->r_maddr);
 655                         if (!na)
 656                                 fprintf(stderr,
 657                                     "\tCouldn't resolve remote address!\n");
 658 #endif
 659                         break;
 660                 }
 661         }
 662         return (na);
 663 }
 664
 665 /*
 666  * Quick check to see if rpcbind is up.  Tries to connect over
 667  * local transport.
 668  */
 669 static bool_t
 670 __rpcbind_is_up(void)
 671 {
 672         struct netconfig *nconf;
 673         struct sockaddr_un sun;
 674         void *localhandle;
 675         int sock;
 676
 677         nconf = NULL;
 678         localhandle = setnetconfig();
 679         while ((nconf = getnetconfig(localhandle)) != NULL) {
 680                 if (nconf->nc_protofmly != NULL &&
 681                     strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0)
 682                          break;
 683         }
 684         if (nconf == NULL)
 685                 return (FALSE);
 686
 687         endnetconfig(localhandle);
 688
 689         memset(&sun, 0, sizeof sun);
 690         sock = _socket(AF_LOCAL, SOCK_STREAM, 0);
 691         if (sock < 0)
 692                 return (FALSE);
 693         sun.sun_family = AF_LOCAL;
 694         strncpy(sun.sun_path, _PATH_RPCBINDSOCK, sizeof(sun.sun_path));
 695         sun.sun_len = SUN_LEN(&sun);
 696
 697         if (_connect(sock, (struct sockaddr *)&sun, sun.sun_len) < 0) {
 698                 _close(sock);
 699                 return (FALSE);
 700         }
 701
 702         _close(sock);
 703         return (TRUE);
 704 }
 705
 706 /*
 707  * An internal function which optimizes rpcb_getaddr function.  It also
 708  * returns the client handle that it uses to contact the remote rpcbind.
 709  *
 710  * The algorithm used: If the transports is TCP or UDP, it first tries
 711  * version 2 (portmap), 4 and then 3 (svr4).  This order should be
 712  * changed in the next OS release to 4, 2 and 3.  We are assuming that by
 713  * that time, version 4 would be available on many machines on the network.
 714  * With this algorithm, we get performance as well as a plan for
 715  * obsoleting version 2.
 716  *
 717  * For all other transports, the algorithm remains as 4 and then 3.
 718  *
 719  * XXX: Due to some problems with t_connect(), we do not reuse the same client
 720  * handle for COTS cases and hence in these cases we do not return the
 721  * client handle.  This code will change if t_connect() ever
 722  * starts working properly.  Also look under clnt_vc.c.
 723  */
 724 struct netbuf *
 725 __rpcb_findaddr_timed(rpcprog_t program, rpcvers_t version,
 726                       const struct netconfig *nconf, const char *host,
 727                       CLIENT **clpp, struct timeval *tp)
 728 {
 729         static bool_t check_rpcbind = TRUE;
 730         CLIENT *client = NULL;
 731         RPCB parms;
 732         enum clnt_stat clnt_st;
 733         char *ua = NULL;
 734         rpcvers_t vers;
 735         struct netbuf *address = NULL;
 736         rpcvers_t start_vers = RPCBVERS4;
 737         struct netbuf servaddr;
 738
 739         /* parameter checking */
 740         if (nconf == NULL) {
 741                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 742                 return (NULL);
 743         }
 744
 745         parms.r_addr = NULL;
 746
 747         /*
 748          * Use default total timeout if no timeout is specified.
 749          */
 750         if (tp == NULL)
 751                 tp = &tottimeout;
 752
 753 #ifdef PORTMAP
 754         /* Try version 2 for TCP or UDP */
 755         if (strcmp(nconf->nc_protofmly, NC_INET) == 0) {
 756                 u_short port = 0;
 757                 struct netbuf remote;
 758                 rpcvers_t pmapvers = 2;
 759                 struct pmap pmapparms;
 760
 761                 /*
 762                  * Try UDP only - there are some portmappers out
 763                  * there that use UDP only.
 764                  */
 765                 if (strcmp(nconf->nc_proto, NC_TCP) == 0) {
 766                         struct netconfig *newnconf;
 767
 768                         if ((newnconf = getnetconfigent("udp")) == NULL) {
 769                                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 770                                 return (NULL);
 771                         }
 772                         client = getclnthandle(host, newnconf, &parms.r_addr);
 773                         freenetconfigent(newnconf);
 774                 } else {
 775                         client = getclnthandle(host, nconf, &parms.r_addr);
 776                 }
 777                 if (client == NULL)
 778                         return (NULL);
 779
 780                 /*
 781                  * Set version and retry timeout.
 782                  */
 783                 CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *)&rpcbrmttime);
 784                 CLNT_CONTROL(client, CLSET_VERS, (char *)&pmapvers);
 785
 786                 pmapparms.pm_prog = program;
 787                 pmapparms.pm_vers = version;
 788                 pmapparms.pm_prot = strcmp(nconf->nc_proto, NC_TCP) ?
 789                                         IPPROTO_UDP : IPPROTO_TCP;
 790                 pmapparms.pm_port = 0;  /* not needed */
 791                 clnt_st = CLNT_CALL(client, (rpcproc_t)PMAPPROC_GETPORT,
 792                     (xdrproc_t) xdr_pmap, (caddr_t)(void *)&pmapparms,
 793                     (xdrproc_t) xdr_u_short, (caddr_t)(void *)&port,
 794                     *tp);
 795                 if (clnt_st != RPC_SUCCESS) {
 796                         if ((clnt_st == RPC_PROGVERSMISMATCH) ||
 797                                 (clnt_st == RPC_PROGUNAVAIL))
 798                                 goto try_rpcbind; /* Try different versions */
 799                         rpc_createerr.cf_stat = RPC_PMAPFAILURE;
 800                         clnt_geterr(client, &rpc_createerr.cf_error);
 801                         goto error;
 802                 } else if (port == 0) {
 803                         address = NULL;
 804                         rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
 805                         goto error;
 806                 }
 807                 port = htons(port);
 808                 CLNT_CONTROL(client, CLGET_SVC_ADDR, (char *)&remote);
 809                 if (((address = (struct netbuf *)
 810                         malloc(sizeof (struct netbuf))) == NULL) ||
 811                     ((address->buf = (char *)
 812                         malloc(remote.len)) == NULL)) {
 813                         rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 814                         clnt_geterr(client, &rpc_createerr.cf_error);
 815                         if (address) {
 816                                 free(address);
 817                                 address = NULL;
 818                         }
 819                         goto error;
 820                 }
 821                 memcpy(address->buf, remote.buf, remote.len);
 822                 memcpy(&((char *)address->buf)[sizeof (short)],
 823                                 (char *)(void *)&port, sizeof (short));
 824                 address->len = address->maxlen = remote.len;
 825                 goto done;
 826         }
 827 #endif                          /* PORTMAP */
 828
 829 try_rpcbind:
 830         /*
 831          * Check if rpcbind is up.  This prevents needless delays when
 832          * accessing applications such as the keyserver while booting
 833          * disklessly.
 834          */
 835         if (check_rpcbind && strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) {
 836                 if (!__rpcbind_is_up()) {
 837                         rpc_createerr.cf_stat = RPC_PMAPFAILURE;
 838                         rpc_createerr.cf_error.re_errno = 0;
 839                         goto error;
 840                 }
 841                 check_rpcbind = FALSE;
 842         }
 843
 844         /*
 845          * Now we try version 4 and then 3.
 846          * We also send the remote system the address we used to
 847          * contact it in case it can help to connect back with us
 848          */
 849         parms.r_prog = program;
 850         parms.r_vers = version;
 851         /*LINTED const castaway*/
 852         parms.r_owner = (char *) &nullstring[0];        /* not needed; */
 853                                                         /* just for xdring */
 854         parms.r_netid = nconf->nc_netid; /* not really needed */
 855
 856         /*
 857          * If a COTS transport is being used, try getting address via CLTS
 858          * transport.  This works only with version 4.
 859          */
 860         if (nconf->nc_semantics == NC_TPI_COTS_ORD ||
 861                         nconf->nc_semantics == NC_TPI_COTS) {
 862
 863                 void *handle;
 864                 struct netconfig *nconf_clts;
 865                 rpcb_entry_list_ptr relp = NULL;
 866
 867                 if (client == NULL) {
 868                         /* This did not go through the above PORTMAP/TCP code */
 869                         if ((handle = __rpc_setconf("datagram_v")) != NULL) {
 870                                 while ((nconf_clts = __rpc_getconf(handle))
 871                                         != NULL) {
 872                                         if (strcmp(nconf_clts->nc_protofmly,
 873                                                 nconf->nc_protofmly) != 0) {
 874                                                 continue;
 875                                         }
 876                                         client = getclnthandle(host, nconf_clts,
 877                                                         &parms.r_addr);
 878                                         break;
 879                                 }
 880                                 __rpc_endconf(handle);
 881                         }
 882                         if (client == NULL)
 883                                 goto regular_rpcbind;   /* Go the regular way */
 884                 } else {
 885                         /* This is a UDP PORTMAP handle.  Change to version 4 */
 886                         vers = RPCBVERS4;
 887                         CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers);
 888                 }
 889                 /*
 890                  * We also send the remote system the address we used to
 891                  * contact it in case it can help it connect back with us
 892                  */
 893                 if (parms.r_addr == NULL) {
 894                         /*LINTED const castaway*/
 895                         parms.r_addr = (char *) &nullstring[0]; /* for XDRing */
 896                 }
 897
 898                 CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *)&rpcbrmttime);
 899
 900                 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDRLIST,
 901                     (xdrproc_t) xdr_rpcb, (char *)(void *)&parms,
 902                     (xdrproc_t) xdr_rpcb_entry_list_ptr,
 903                     (char *)(void *)&relp, *tp);
 904                 if (clnt_st == RPC_SUCCESS) {
 905                         if ((address = got_entry(relp, nconf)) != NULL) {
 906                                 xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr,
 907                                     (char *)(void *)&relp);
 908                                 CLNT_CONTROL(client, CLGET_SVC_ADDR,
 909                                         (char *)(void *)&servaddr);
 910                                 __rpc_fixup_addr(address, &servaddr);
 911                                 goto done;
 912                         }
 913                         /* Entry not found for this transport */
 914                         xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr,
 915                             (char *)(void *)&relp);
 916                         /*
 917                          * XXX: should have perhaps returned with error but
 918                          * since the remote machine might not always be able
 919                          * to send the address on all transports, we try the
 920                          * regular way with regular_rpcbind
 921                          */
 922                         goto regular_rpcbind;
 923                 } else if ((clnt_st == RPC_PROGVERSMISMATCH) ||
 924                         (clnt_st == RPC_PROGUNAVAIL)) {
 925                         start_vers = RPCBVERS;  /* Try version 3 now */
 926                         goto regular_rpcbind; /* Try different versions */
 927                 } else {
 928                         rpc_createerr.cf_stat = RPC_PMAPFAILURE;
 929                         clnt_geterr(client, &rpc_createerr.cf_error);
 930                         goto error;
 931                 }
 932         }
 933
 934 regular_rpcbind:
 935
 936         /* Now the same transport is to be used to get the address */
 937         if (client && ((nconf->nc_semantics == NC_TPI_COTS_ORD) ||
 938                         (nconf->nc_semantics == NC_TPI_COTS))) {
 939                 /* A CLTS type of client - destroy it */
 940                 CLNT_DESTROY(client);
 941                 client = NULL;
 942         }
 943
 944         if (client == NULL) {
 945                 client = getclnthandle(host, nconf, &parms.r_addr);
 946                 if (client == NULL) {
 947                         goto error;
 948                 }
 949         }
 950         if (parms.r_addr == NULL) {
 951                 /*LINTED const castaway*/
 952                 parms.r_addr = (char *) &nullstring[0];
 953         }
 954
 955         /* First try from start_vers and then version 3 (RPCBVERS) */
 956
 957         CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *) &rpcbrmttime);
 958         for (vers = start_vers;  vers >= RPCBVERS; vers--) {
 959                 /* Set the version */
 960                 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers);
 961                 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDR,
 962                     (xdrproc_t) xdr_rpcb, (char *)(void *)&parms,
 963                     (xdrproc_t) xdr_wrapstring, (char *)(void *) &ua, *tp);
 964                 if (clnt_st == RPC_SUCCESS) {
 965                         if ((ua == NULL) || (ua[0] == 0)) {
 966                                 /* address unknown */
 967                                 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
 968                                 goto error;
 969                         }
 970                         address = uaddr2taddr(nconf, ua);
 971 #ifdef ND_DEBUG
 972                         fprintf(stderr, "\tRemote address is [%s]\n", ua);
 973                         if (!address)
 974                                 fprintf(stderr,
 975                                         "\tCouldn't resolve remote address!\n");
 976 #endif
 977                         xdr_free((xdrproc_t)xdr_wrapstring,
 978                             (char *)(void *)&ua);
 979
 980                         if (! address) {
 981                                 /* We don't know about your universal address */
 982                                 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE;
 983                                 goto error;
 984                         }
 985                         CLNT_CONTROL(client, CLGET_SVC_ADDR,
 986                             (char *)(void *)&servaddr);
 987                         __rpc_fixup_addr(address, &servaddr);
 988                         goto done;
 989                 } else if (clnt_st == RPC_PROGVERSMISMATCH) {
 990                         struct rpc_err rpcerr;
 991
 992                         clnt_geterr(client, &rpcerr);
 993                         if (rpcerr.re_vers.low > RPCBVERS4)
 994                                 goto error;  /* a new version, can't handle */
 995                 } else if (clnt_st != RPC_PROGUNAVAIL) {
 996                         /* Cant handle this error */
 997                         rpc_createerr.cf_stat = clnt_st;
 998                         clnt_geterr(client, &rpc_createerr.cf_error);
 999                         goto error;
1000                 }
1001         }
1002
1003 error:
1004         if (client) {
1005                 CLNT_DESTROY(client);
1006                 client = NULL;
1007         }
1008 done:
1009         if (nconf->nc_semantics != NC_TPI_CLTS) {
1010                 /* This client is the connectionless one */
1011                 if (client) {
1012                         CLNT_DESTROY(client);
1013                         client = NULL;
1014                 }
1015         }
1016         if (clpp) {
1017                 *clpp = client;
1018         } else if (client) {
1019                 CLNT_DESTROY(client);
1020         }
1021         if (parms.r_addr != NULL && parms.r_addr != nullstring)
1022                 free(parms.r_addr);
1023         return (address);
1024 }
1025
1026
1027 /*
1028  * Find the mapped address for program, version.
1029  * Calls the rpcbind service remotely to do the lookup.
1030  * Uses the transport specified in nconf.
1031  * Returns FALSE (0) if no map exists, else returns 1.
1032  *
1033  * Assuming that the address is all properly allocated
1034  */
1035 int
1036 rpcb_getaddr(rpcprog_t program, rpcvers_t version,
1037              const struct netconfig *nconf, struct netbuf *address,
1038              const char *host)
1039 {
1040         struct netbuf *na;
1041
1042         if ((na = __rpcb_findaddr_timed(program, version,
1043             (struct netconfig *) nconf, (char *) host,
1044             (CLIENT **) NULL, (struct timeval *) NULL)) == NULL)
1045                 return (FALSE);
1046
1047         if (na->len > address->maxlen) {
1048                 /* Too long address */
1049                 free(na->buf);
1050                 free(na);
1051                 rpc_createerr.cf_stat = RPC_FAILED;
1052                 return (FALSE);
1053         }
1054         memcpy(address->buf, na->buf, (size_t)na->len);
1055         address->len = na->len;
1056         free(na->buf);
1057         free(na);
1058         return (TRUE);
1059 }
1060
1061 /*
1062  * Get a copy of the current maps.
1063  * Calls the rpcbind service remotely to get the maps.
1064  *
1065  * It returns only a list of the services
1066  * It returns NULL on failure.
1067  */
1068 rpcblist *
1069 rpcb_getmaps(const struct netconfig *nconf, const char *host)
1070 {
1071         rpcblist_ptr head = NULL;
1072         CLIENT *client;
1073         enum clnt_stat clnt_st;
1074         rpcvers_t vers = 0;
1075
1076         client = getclnthandle(host, nconf, NULL);
1077         if (client == NULL) {
1078                 return (head);
1079         }
1080         clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP,
1081             (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr,
1082             (char *)(void *)&head, tottimeout);
1083         if (clnt_st == RPC_SUCCESS)
1084                 goto done;
1085
1086         if ((clnt_st != RPC_PROGVERSMISMATCH) &&
1087             (clnt_st != RPC_PROGUNAVAIL)) {
1088                 rpc_createerr.cf_stat = RPC_RPCBFAILURE;
1089                 clnt_geterr(client, &rpc_createerr.cf_error);
1090                 goto done;
1091         }
1092
1093         /* fall back to earlier version */
1094         CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers);
1095         if (vers == RPCBVERS4) {
1096                 vers = RPCBVERS;
1097                 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers);
1098                 if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP,
1099                     (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr,
1100                     (char *)(void *)&head, tottimeout) == RPC_SUCCESS)
1101                         goto done;
1102         }
1103         rpc_createerr.cf_stat = RPC_RPCBFAILURE;
1104         clnt_geterr(client, &rpc_createerr.cf_error);
1105
1106 done:
1107         CLNT_DESTROY(client);
1108         return (head);
1109 }
1110
1111 /*
1112  * rpcbinder remote-call-service interface.
1113  * This routine is used to call the rpcbind remote call service
1114  * which will look up a service program in the address maps, and then
1115  * remotely call that routine with the given parameters. This allows
1116  * programs to do a lookup and call in one step.
1117 */
1118 enum clnt_stat
1119 rpcb_rmtcall(const struct netconfig *nconf, const char *host, rpcprog_t prog,
1120              rpcvers_t vers, rpcproc_t proc, xdrproc_t xdrargs, caddr_t argsp,
1121              xdrproc_t xdrres, caddr_t resp, struct timeval tout,
1122              const struct netbuf *addr_ptr)
1123 {
1124         CLIENT *client;
1125         enum clnt_stat stat;
1126         struct r_rpcb_rmtcallargs a;
1127         struct r_rpcb_rmtcallres r;
1128         rpcvers_t rpcb_vers;
1129
1130         stat = 0;
1131         client = getclnthandle(host, nconf, NULL);
1132         if (client == NULL) {
1133                 return (RPC_FAILED);
1134         }
1135         /*LINTED const castaway*/
1136         CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *)(void *)&rmttimeout);
1137         a.prog = prog;
1138         a.vers = vers;
1139         a.proc = proc;
1140         a.args.args_val = argsp;
1141         a.xdr_args = xdrargs;
1142         r.addr = NULL;
1143         r.results.results_val = resp;
1144         r.xdr_res = xdrres;
1145
1146         for (rpcb_vers = RPCBVERS4; rpcb_vers >= RPCBVERS; rpcb_vers--) {
1147                 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&rpcb_vers);
1148                 stat = CLNT_CALL(client, (rpcproc_t)RPCBPROC_CALLIT,
1149                     (xdrproc_t) xdr_rpcb_rmtcallargs, (char *)(void *)&a,
1150                     (xdrproc_t) xdr_rpcb_rmtcallres, (char *)(void *)&r, tout);
1151                 if ((stat == RPC_SUCCESS) && (addr_ptr != NULL)) {
1152                         struct netbuf *na;
1153                         /*LINTED const castaway*/
1154                         na = uaddr2taddr((struct netconfig *) nconf, r.addr);
1155                         if (!na) {
1156                                 stat = RPC_N2AXLATEFAILURE;
1157                                 /*LINTED const castaway*/
1158                                 ((struct netbuf *) addr_ptr)->len = 0;
1159                                 goto error;
1160                         }
1161                         if (na->len > addr_ptr->maxlen) {
1162                                 /* Too long address */
1163                                 stat = RPC_FAILED; /* XXX A better error no */
1164                                 free(na->buf);
1165                                 free(na);
1166                                 /*LINTED const castaway*/
1167                                 ((struct netbuf *) addr_ptr)->len = 0;
1168                                 goto error;
1169                         }
1170                         memcpy(addr_ptr->buf, na->buf, (size_t)na->len);
1171                         /*LINTED const castaway*/
1172                         ((struct netbuf *)addr_ptr)->len = na->len;
1173                         free(na->buf);
1174                         free(na);
1175                         break;
1176                 } else if ((stat != RPC_PROGVERSMISMATCH) &&
1177                             (stat != RPC_PROGUNAVAIL)) {
1178                         goto error;
1179                 }
1180         }
1181 error:
1182         CLNT_DESTROY(client);
1183         if (r.addr)
1184                 xdr_free((xdrproc_t) xdr_wrapstring, (char *)(void *)&r.addr);
1185         return (stat);
1186 }
1187
1188 /*
1189  * Gets the time on the remote host.
1190  * Returns 1 if succeeds else 0.
1191  */
1192 bool_t
1193 rpcb_gettime(const char *host, time_t *timep)
1194 {
1195         CLIENT *client = NULL;
1196         void *handle;
1197         struct netconfig *nconf;
1198         rpcvers_t vers;
1199         enum clnt_stat st;
1200
1201
1202         if ((host == NULL) || (host[0] == 0)) {
1203                 time(timep);
1204                 return (TRUE);
1205         }
1206
1207         if ((handle = __rpc_setconf("netpath")) == NULL) {
1208                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
1209                 return (FALSE);
1210         }
1211         rpc_createerr.cf_stat = RPC_SUCCESS;
1212         while (client == NULL) {
1213                 if ((nconf = __rpc_getconf(handle)) == NULL) {
1214                         if (rpc_createerr.cf_stat == RPC_SUCCESS)
1215                                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
1216                         break;
1217                 }
1218                 client = getclnthandle(host, nconf, NULL);
1219                 if (client)
1220                         break;
1221         }
1222         __rpc_endconf(handle);
1223         if (client == (CLIENT *) NULL) {
1224                 return (FALSE);
1225         }
1226
1227         st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME,
1228                 (xdrproc_t) xdr_void, NULL,
1229                 (xdrproc_t) xdr_int, (char *)(void *)timep, tottimeout);
1230
1231         if ((st == RPC_PROGVERSMISMATCH) || (st == RPC_PROGUNAVAIL)) {
1232                 CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers);
1233                 if (vers == RPCBVERS4) {
1234                         /* fall back to earlier version */
1235                         vers = RPCBVERS;
1236                         CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers);
1237                         st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME,
1238                                 (xdrproc_t) xdr_void, NULL,
1239                                 (xdrproc_t) xdr_int, (char *)(void *)timep,
1240                                 tottimeout);
1241                 }
1242         }
1243         CLNT_DESTROY(client);
1244         return (st == RPC_SUCCESS? TRUE: FALSE);
1245 }
1246
1247 /*
1248  * Converts taddr to universal address.  This routine should never
1249  * really be called because local n2a libraries are always provided.
1250  */
1251 char *
1252 rpcb_taddr2uaddr(struct netconfig *nconf, struct netbuf *taddr)
1253 {
1254         CLIENT *client;
1255         char *uaddr = NULL;
1256
1257
1258         /* parameter checking */
1259         if (nconf == NULL) {
1260                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
1261                 return (NULL);
1262         }
1263         if (taddr == NULL) {
1264                 rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
1265                 return (NULL);
1266         }
1267         client = local_rpcb();
1268         if (! client) {
1269                 return (NULL);
1270         }
1271
1272         CLNT_CALL(client, (rpcproc_t)RPCBPROC_TADDR2UADDR,
1273             (xdrproc_t) xdr_netbuf, (char *)(void *)taddr,
1274             (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr, tottimeout);
1275         CLNT_DESTROY(client);
1276         return (uaddr);
1277 }
1278
1279 /*
1280  * Converts universal address to netbuf.  This routine should never
1281  * really be called because local n2a libraries are always provided.
1282  */
1283 struct netbuf *
1284 rpcb_uaddr2taddr(struct netconfig *nconf, char *uaddr)
1285 {
1286         CLIENT *client;
1287         struct netbuf *taddr;
1288
1289
1290         /* parameter checking */
1291         if (nconf == NULL) {
1292                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
1293                 return (NULL);
1294         }
1295         if (uaddr == NULL) {
1296                 rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
1297                 return (NULL);
1298         }
1299         client = local_rpcb();
1300         if (! client) {
1301                 return (NULL);
1302         }
1303
1304         taddr = (struct netbuf *)calloc(1, sizeof (struct netbuf));
1305         if (taddr == NULL) {
1306                 CLNT_DESTROY(client);
1307                 return (NULL);
1308         }
1309         if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_UADDR2TADDR,
1310             (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr,
1311             (xdrproc_t) xdr_netbuf, (char *)(void *)taddr,
1312             tottimeout) != RPC_SUCCESS) {
1313                 free(taddr);
1314                 taddr = NULL;
1315         }
1316         CLNT_DESTROY(client);
1317         return (taddr);
1318 }