lib/libc/rpc/rpcb_clnt.c

   1 /*      $NetBSD: rpcb_clnt.c,v 1.6 2000/07/16 06:41:43 itojun Exp $     */
   2
   3 /*
   4  * The contents of this file are subject to the Sun Standards
   5  * License Version 1.0 the (the "License";) You may not use
   6  * this file except in compliance with the License.  You may
   7  * obtain a copy of the License at lib/libc/rpc/LICENSE
   8  *
   9  * Software distributed under the License is distributed on
  10  * an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either
  11  * express or implied.  See the License for the specific
  12  * language governing rights and limitations under the License.
  13  *
  14  * The Original Code is Copyright 1998 by Sun Microsystems, Inc
  15  *
  16  * The Initial Developer of the Original Code is:  Sun
  17  * Microsystems, Inc.
  18  *
  19  * All Rights Reserved.
  20  *
  21  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
  22  * unrestricted use provided that this legend is included on all tape
  23  * media and as a part of the software program in whole or part.  Users
  24  * may copy or modify Sun RPC without charge, but are not authorized
  25  * to license or distribute it to anyone else except as part of a product or
  26  * program developed by the user.
  27  *
  28  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  29  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  30  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  31  *
  32  * Sun RPC is provided with no support and without any obligation on the
  33  * part of Sun Microsystems, Inc. to assist in its use, correction,
  34  * modification or enhancement.
  35  *
  36  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  37  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  38  * OR ANY PART THEREOF.
  39  *
  40  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  41  * or profits or other special, indirect and consequential damages, even if
  42  * Sun has been advised of the possibility of such damages.
  43  *
  44  * Sun Microsystems, Inc.
  45  * 2550 Garcia Avenue
  46  * Mountain View, California  94043
  47  */
  48 /*
  49  * Copyright (c) 1986-1991 by Sun Microsystems Inc.
  50  */
  51
  52 /* #ident       "@(#)rpcb_clnt.c        1.27    94/04/24 SMI" */
  53
  54
  55 #if defined(LIBC_SCCS) && !defined(lint)
  56 static char sccsid[] = "@(#)rpcb_clnt.c 1.30 89/06/21 Copyr 1988 Sun Micro";
  57 #endif
  58 #include <sys/cdefs.h>
  59 __FBSDID("$FreeBSD$");
  60
  61 /*
  62  * rpcb_clnt.c
  63  * interface to rpcbind rpc service.
  64  *
  65  * Copyright (C) 1988, Sun Microsystems, Inc.
  66  */
  67
  68 #include "namespace.h"
  69 #include "reentrant.h"
  70 #include <sys/types.h>
  71 #include <sys/socket.h>
  72 #include <sys/un.h>
  73 #include <sys/utsname.h>
  74 #include <rpc/rpc.h>
  75 #include <rpc/rpcb_prot.h>
  76 #include <rpc/nettype.h>
  77 #include <netconfig.h>
  78 #ifdef PORTMAP
  79 #include <netinet/in.h>         /* FOR IPPROTO_TCP/UDP definitions */
  80 #include <rpc/pmap_prot.h>
  81 #endif                          /* PORTMAP */
  82 #include <stdio.h>
  83 #include <errno.h>
  84 #include <stdlib.h>
  85 #include <string.h>
  86 #include <unistd.h>
  87 #include <netdb.h>
  88 #include <syslog.h>
  89 #include "un-namespace.h"
  90
  91 #include "rpc_com.h"
  92 #include "mt_misc.h"
  93
  94 static struct timeval tottimeout = { 60, 0 };
  95 static const struct timeval rmttimeout = { 3, 0 };
  96 static struct timeval rpcbrmttime = { 15, 0 };
  97
  98 extern bool_t xdr_wrapstring(XDR *, char **);
  99
 100 static const char nullstring[] = "\000";
 101
 102 #define CACHESIZE 6
 103
 104 struct address_cache {
 105         char *ac_host;
 106         char *ac_netid;
 107         char *ac_uaddr;
 108         struct netbuf *ac_taddr;
 109         struct address_cache *ac_next;
 110 };
 111
 112 static struct address_cache *front;
 113 static int cachesize;
 114
 115 #define CLCR_GET_RPCB_TIMEOUT   1
 116 #define CLCR_SET_RPCB_TIMEOUT   2
 117
 118
 119 extern int __rpc_lowvers;
 120
 121 static struct address_cache *check_cache(const char *, const char *);
 122 static void delete_cache(struct netbuf *);
 123 static void add_cache(const char *, const char *, struct netbuf *, char *);
 124 static CLIENT *getclnthandle(const char *, const struct netconfig *, char **);
 125 static CLIENT *local_rpcb(void);
 126 static struct netbuf *got_entry(rpcb_entry_list_ptr, const struct netconfig *);
 127
 128 /*
 129  * This routine adjusts the timeout used for calls to the remote rpcbind.
 130  * Also, this routine can be used to set the use of portmapper version 2
 131  * only when doing rpc_broadcasts
 132  * These are private routines that may not be provided in future releases.
 133  */
 134 bool_t
 135 __rpc_control(request, info)
 136         int     request;
 137         void    *info;
 138 {
 139         switch (request) {
 140         case CLCR_GET_RPCB_TIMEOUT:
 141                 *(struct timeval *)info = tottimeout;
 142                 break;
 143         case CLCR_SET_RPCB_TIMEOUT:
 144                 tottimeout = *(struct timeval *)info;
 145                 break;
 146         case CLCR_SET_LOWVERS:
 147                 __rpc_lowvers = *(int *)info;
 148                 break;
 149         case CLCR_GET_LOWVERS:
 150                 *(int *)info = __rpc_lowvers;
 151                 break;
 152         default:
 153                 return (FALSE);
 154         }
 155         return (TRUE);
 156 }
 157
 158 /*
 159  *      It might seem that a reader/writer lock would be more reasonable here.
 160  *      However because getclnthandle(), the only user of the cache functions,
 161  *      may do a delete_cache() operation if a check_cache() fails to return an
 162  *      address useful to clnt_tli_create(), we may as well use a mutex.
 163  */
 164 /*
 165  * As it turns out, if the cache lock is *not* a reader/writer lock, we will
 166  * block all clnt_create's if we are trying to connect to a host that's down,
 167  * since the lock will be held all during that time.
 168  */
 169
 170 /*
 171  * The routines check_cache(), add_cache(), delete_cache() manage the
 172  * cache of rpcbind addresses for (host, netid).
 173  */
 174
 175 static struct address_cache *
 176 check_cache(host, netid)
 177         const char *host, *netid;
 178 {
 179         struct address_cache *cptr;
 180
 181         /* READ LOCK HELD ON ENTRY: rpcbaddr_cache_lock */
 182
 183         for (cptr = front; cptr != NULL; cptr = cptr->ac_next) {
 184                 if (!strcmp(cptr->ac_host, host) &&
 185                     !strcmp(cptr->ac_netid, netid)) {
 186 #ifdef ND_DEBUG
 187                         fprintf(stderr, "Found cache entry for %s: %s\n",
 188                                 host, netid);
 189 #endif
 190                         return (cptr);
 191                 }
 192         }
 193         return ((struct address_cache *) NULL);
 194 }
 195
 196 static void
 197 delete_cache(addr)
 198         struct netbuf *addr;
 199 {
 200         struct address_cache *cptr, *prevptr = NULL;
 201
 202         /* WRITE LOCK HELD ON ENTRY: rpcbaddr_cache_lock */
 203         for (cptr = front; cptr != NULL; cptr = cptr->ac_next) {
 204                 if (!memcmp(cptr->ac_taddr->buf, addr->buf, addr->len)) {
 205                         free(cptr->ac_host);
 206                         free(cptr->ac_netid);
 207                         free(cptr->ac_taddr->buf);
 208                         free(cptr->ac_taddr);
 209                         if (cptr->ac_uaddr)
 210                                 free(cptr->ac_uaddr);
 211                         if (prevptr)
 212                                 prevptr->ac_next = cptr->ac_next;
 213                         else
 214                                 front = cptr->ac_next;
 215                         free(cptr);
 216                         cachesize--;
 217                         break;
 218                 }
 219                 prevptr = cptr;
 220         }
 221 }
 222
 223 static void
 224 add_cache(host, netid, taddr, uaddr)
 225         const char *host, *netid;
 226         char *uaddr;
 227         struct netbuf *taddr;
 228 {
 229         struct address_cache  *ad_cache, *cptr, *prevptr;
 230
 231         ad_cache = (struct address_cache *)
 232                         malloc(sizeof (struct address_cache));
 233         if (!ad_cache) {
 234                 return;
 235         }
 236         ad_cache->ac_host = strdup(host);
 237         ad_cache->ac_netid = strdup(netid);
 238         ad_cache->ac_uaddr = uaddr ? strdup(uaddr) : NULL;
 239         ad_cache->ac_taddr = (struct netbuf *)malloc(sizeof (struct netbuf));
 240         if (!ad_cache->ac_host || !ad_cache->ac_netid || !ad_cache->ac_taddr ||
 241                 (uaddr && !ad_cache->ac_uaddr)) {
 242                 goto out;
 243         }
 244         ad_cache->ac_taddr->len = ad_cache->ac_taddr->maxlen = taddr->len;
 245         ad_cache->ac_taddr->buf = (char *) malloc(taddr->len);
 246         if (ad_cache->ac_taddr->buf == NULL) {
 247 out:
 248                 if (ad_cache->ac_host)
 249                         free(ad_cache->ac_host);
 250                 if (ad_cache->ac_netid)
 251                         free(ad_cache->ac_netid);
 252                 if (ad_cache->ac_uaddr)
 253                         free(ad_cache->ac_uaddr);
 254                 if (ad_cache->ac_taddr)
 255                         free(ad_cache->ac_taddr);
 256                 free(ad_cache);
 257                 return;
 258         }
 259         memcpy(ad_cache->ac_taddr->buf, taddr->buf, taddr->len);
 260 #ifdef ND_DEBUG
 261         fprintf(stderr, "Added to cache: %s : %s\n", host, netid);
 262 #endif
 263
 264 /* VARIABLES PROTECTED BY rpcbaddr_cache_lock:  cptr */
 265
 266         rwlock_wrlock(&rpcbaddr_cache_lock);
 267         if (cachesize < CACHESIZE) {
 268                 ad_cache->ac_next = front;
 269                 front = ad_cache;
 270                 cachesize++;
 271         } else {
 272                 /* Free the last entry */
 273                 cptr = front;
 274                 prevptr = NULL;
 275                 while (cptr->ac_next) {
 276                         prevptr = cptr;
 277                         cptr = cptr->ac_next;
 278                 }
 279
 280 #ifdef ND_DEBUG
 281                 fprintf(stderr, "Deleted from cache: %s : %s\n",
 282                         cptr->ac_host, cptr->ac_netid);
 283 #endif
 284                 free(cptr->ac_host);
 285                 free(cptr->ac_netid);
 286                 free(cptr->ac_taddr->buf);
 287                 free(cptr->ac_taddr);
 288                 if (cptr->ac_uaddr)
 289                         free(cptr->ac_uaddr);
 290
 291                 if (prevptr) {
 292                         prevptr->ac_next = NULL;
 293                         ad_cache->ac_next = front;
 294                         front = ad_cache;
 295                 } else {
 296                         front = ad_cache;
 297                         ad_cache->ac_next = NULL;
 298                 }
 299                 free(cptr);
 300         }
 301         rwlock_unlock(&rpcbaddr_cache_lock);
 302 }
 303
 304 /*
 305  * This routine will return a client handle that is connected to the
 306  * rpcbind. If targaddr is non-NULL, the "universal address" of the
 307  * host will be stored in *targaddr; the caller is responsible for
 308  * freeing this string.
 309  * On error, returns NULL and free's everything.
 310  */
 311 static CLIENT *
 312 getclnthandle(host, nconf, targaddr)
 313         const char *host;
 314         const struct netconfig *nconf;
 315         char **targaddr;
 316 {
 317         CLIENT *client;
 318         struct netbuf *addr, taddr;
 319         struct netbuf addr_to_delete;
 320         struct __rpc_sockinfo si;
 321         struct addrinfo hints, *res, *tres;
 322         struct address_cache *ad_cache;
 323         char *tmpaddr;
 324
 325 /* VARIABLES PROTECTED BY rpcbaddr_cache_lock:  ad_cache */
 326
 327         /* Get the address of the rpcbind.  Check cache first */
 328         client = NULL;
 329         addr_to_delete.len = 0;
 330         rwlock_rdlock(&rpcbaddr_cache_lock);
 331         ad_cache = NULL;
 332         if (host != NULL)
 333                 ad_cache = check_cache(host, nconf->nc_netid);
 334         if (ad_cache != NULL) {
 335                 addr = ad_cache->ac_taddr;
 336                 client = clnt_tli_create(RPC_ANYFD, nconf, addr,
 337                     (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0);
 338                 if (client != NULL) {
 339                         if (targaddr)
 340                                 *targaddr = strdup(ad_cache->ac_uaddr);
 341                         rwlock_unlock(&rpcbaddr_cache_lock);
 342                         return (client);
 343                 }
 344                 addr_to_delete.len = addr->len;
 345                 addr_to_delete.buf = (char *)malloc(addr->len);
 346                 if (addr_to_delete.buf == NULL) {
 347                         addr_to_delete.len = 0;
 348                 } else {
 349                         memcpy(addr_to_delete.buf, addr->buf, addr->len);
 350                 }
 351         }
 352         rwlock_unlock(&rpcbaddr_cache_lock);
 353         if (addr_to_delete.len != 0) {
 354                 /*
 355                  * Assume this may be due to cache data being
 356                  *  outdated
 357                  */
 358                 rwlock_wrlock(&rpcbaddr_cache_lock);
 359                 delete_cache(&addr_to_delete);
 360                 rwlock_unlock(&rpcbaddr_cache_lock);
 361                 free(addr_to_delete.buf);
 362         }
 363         if (!__rpc_nconf2sockinfo(nconf, &si)) {
 364                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 365                 return NULL;
 366         }
 367
 368         memset(&hints, 0, sizeof hints);
 369         hints.ai_family = si.si_af;
 370         hints.ai_socktype = si.si_socktype;
 371         hints.ai_protocol = si.si_proto;
 372
 373 #ifdef CLNT_DEBUG
 374         printf("trying netid %s family %d proto %d socktype %d\n",
 375             nconf->nc_netid, si.si_af, si.si_proto, si.si_socktype);
 376 #endif
 377
 378         if (nconf->nc_protofmly != NULL && strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) {
 379                 client = local_rpcb();
 380                 if (! client) {
 381 #ifdef ND_DEBUG
 382                         clnt_pcreateerror("rpcbind clnt interface");
 383 #endif
 384                         return (NULL);
 385                 } else {
 386                         struct sockaddr_un sun;
 387                         if (targaddr) {
 388                             *targaddr = malloc(sizeof(sun.sun_path));
 389                             if (*targaddr == NULL) {
 390                                 CLNT_DESTROY(client);
 391                                 return (NULL);
 392                             }
 393                             strncpy(*targaddr, _PATH_RPCBINDSOCK,
 394                                 sizeof(sun.sun_path));
 395                         }
 396                         return (client);
 397                 }
 398         } else {
 399                 if (getaddrinfo(host, "sunrpc", &hints, &res) != 0) {
 400                         rpc_createerr.cf_stat = RPC_UNKNOWNHOST;
 401                         return NULL;
 402                 }
 403         }
 404
 405         for (tres = res; tres != NULL; tres = tres->ai_next) {
 406                 taddr.buf = tres->ai_addr;
 407                 taddr.len = taddr.maxlen = tres->ai_addrlen;
 408
 409 #ifdef ND_DEBUG
 410                 {
 411                         char *ua;
 412
 413                         ua = taddr2uaddr(nconf, &taddr);
 414                         fprintf(stderr, "Got it [%s]\n", ua);
 415                         free(ua);
 416                 }
 417 #endif
 418
 419 #ifdef ND_DEBUG
 420                 {
 421                         int i;
 422
 423                         fprintf(stderr, "\tnetbuf len = %d, maxlen = %d\n",
 424                                 taddr.len, taddr.maxlen);
 425                         fprintf(stderr, "\tAddress is ");
 426                         for (i = 0; i < taddr.len; i++)
 427                                 fprintf(stderr, "%u.", ((char *)(taddr.buf))[i]);
 428                         fprintf(stderr, "\n");
 429                 }
 430 #endif
 431                 client = clnt_tli_create(RPC_ANYFD, nconf, &taddr,
 432                     (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0);
 433 #ifdef ND_DEBUG
 434                 if (! client) {
 435                         clnt_pcreateerror("rpcbind clnt interface");
 436                 }
 437 #endif
 438
 439                 if (client) {
 440                         tmpaddr = targaddr ? taddr2uaddr(nconf, &taddr) : NULL;
 441                         add_cache(host, nconf->nc_netid, &taddr, tmpaddr);
 442                         if (targaddr)
 443                                 *targaddr = tmpaddr;
 444                         break;
 445                 }
 446         }
 447         if (res)
 448                 freeaddrinfo(res);
 449         return (client);
 450 }
 451
 452 /* XXX */
 453 #define IN4_LOCALHOST_STRING    "127.0.0.1"
 454 #define IN6_LOCALHOST_STRING    "::1"
 455
 456 /*
 457  * This routine will return a client handle that is connected to the local
 458  * rpcbind. Returns NULL on error and free's everything.
 459  */
 460 static CLIENT *
 461 local_rpcb()
 462 {
 463         CLIENT *client;
 464         static struct netconfig *loopnconf;
 465         static char *hostname;
 466         int sock;
 467         size_t tsize;
 468         struct netbuf nbuf;
 469         struct sockaddr_un sun;
 470
 471         /*
 472          * Try connecting to the local rpcbind through a local socket
 473          * first. If this doesn't work, try all transports defined in
 474          * the netconfig file.
 475          */
 476         memset(&sun, 0, sizeof sun);
 477         sock = _socket(AF_LOCAL, SOCK_STREAM, 0);
 478         if (sock < 0)
 479                 goto try_nconf;
 480         sun.sun_family = AF_LOCAL;
 481         strcpy(sun.sun_path, _PATH_RPCBINDSOCK);
 482         nbuf.len = sun.sun_len = SUN_LEN(&sun);
 483         nbuf.maxlen = sizeof (struct sockaddr_un);
 484         nbuf.buf = &sun;
 485
 486         tsize = __rpc_get_t_size(AF_LOCAL, 0, 0);
 487         client = clnt_vc_create(sock, &nbuf, (rpcprog_t)RPCBPROG,
 488             (rpcvers_t)RPCBVERS, tsize, tsize);
 489
 490         if (client != NULL) {
 491                 /* Mark the socket to be closed in destructor */
 492                 (void) CLNT_CONTROL(client, CLSET_FD_CLOSE, NULL);
 493                 return client;
 494         }
 495
 496         /* Nobody needs this socket anymore; free the descriptor. */
 497         _close(sock);
 498
 499 try_nconf:
 500
 501 /* VARIABLES PROTECTED BY loopnconf_lock: loopnconf */
 502         mutex_lock(&loopnconf_lock);
 503         if (loopnconf == NULL) {
 504                 struct netconfig *nconf, *tmpnconf = NULL;
 505                 void *nc_handle;
 506                 int fd;
 507
 508                 nc_handle = setnetconfig();
 509                 if (nc_handle == NULL) {
 510                         /* fails to open netconfig file */
 511                         syslog (LOG_ERR, "rpc: failed to open " NETCONFIG);
 512                         rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 513                         mutex_unlock(&loopnconf_lock);
 514                         return (NULL);
 515                 }
 516                 while ((nconf = getnetconfig(nc_handle)) != NULL) {
 517 #ifdef INET6
 518                         if ((strcmp(nconf->nc_protofmly, NC_INET6) == 0 ||
 519 #else
 520                         if ((
 521 #endif
 522                              strcmp(nconf->nc_protofmly, NC_INET) == 0) &&
 523                             (nconf->nc_semantics == NC_TPI_COTS ||
 524                              nconf->nc_semantics == NC_TPI_COTS_ORD)) {
 525                                 fd = __rpc_nconf2fd(nconf);
 526                                 /*
 527                                  * Can't create a socket, assume that
 528                                  * this family isn't configured in the kernel.
 529                                  */
 530                                 if (fd < 0)
 531                                         continue;
 532                                 _close(fd);
 533                                 tmpnconf = nconf;
 534                                 if (!strcmp(nconf->nc_protofmly, NC_INET))
 535                                         hostname = IN4_LOCALHOST_STRING;
 536                                 else
 537                                         hostname = IN6_LOCALHOST_STRING;
 538                         }
 539                 }
 540                 if (tmpnconf == NULL) {
 541                         rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 542                         mutex_unlock(&loopnconf_lock);
 543                         return (NULL);
 544                 }
 545                 loopnconf = getnetconfigent(tmpnconf->nc_netid);
 546                 /* loopnconf is never freed */
 547                 endnetconfig(nc_handle);
 548         }
 549         mutex_unlock(&loopnconf_lock);
 550         client = getclnthandle(hostname, loopnconf, NULL);
 551         return (client);
 552 }
 553
 554 /*
 555  * Set a mapping between program, version and address.
 556  * Calls the rpcbind service to do the mapping.
 557  */
 558 bool_t
 559 rpcb_set(program, version, nconf, address)
 560         rpcprog_t program;
 561         rpcvers_t version;
 562         const struct netconfig *nconf;  /* Network structure of transport */
 563         const struct netbuf *address;           /* Services netconfig address */
 564 {
 565         CLIENT *client;
 566         bool_t rslt = FALSE;
 567         RPCB parms;
 568         char uidbuf[32];
 569
 570         /* parameter checking */
 571         if (nconf == NULL) {
 572                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 573                 return (FALSE);
 574         }
 575         if (address == NULL) {
 576                 rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
 577                 return (FALSE);
 578         }
 579         client = local_rpcb();
 580         if (! client) {
 581                 return (FALSE);
 582         }
 583
 584         /* convert to universal */
 585         /*LINTED const castaway*/
 586         parms.r_addr = taddr2uaddr((struct netconfig *) nconf,
 587                                    (struct netbuf *)address);
 588         if (!parms.r_addr) {
 589                 CLNT_DESTROY(client);
 590                 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE;
 591                 return (FALSE); /* no universal address */
 592         }
 593         parms.r_prog = program;
 594         parms.r_vers = version;
 595         parms.r_netid = nconf->nc_netid;
 596         /*
 597          * Though uid is not being used directly, we still send it for
 598          * completeness.  For non-unix platforms, perhaps some other
 599          * string or an empty string can be sent.
 600          */
 601         (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid());
 602         parms.r_owner = uidbuf;
 603
 604         CLNT_CALL(client, (rpcproc_t)RPCBPROC_SET, (xdrproc_t) xdr_rpcb,
 605             (char *)(void *)&parms, (xdrproc_t) xdr_bool,
 606             (char *)(void *)&rslt, tottimeout);
 607
 608         CLNT_DESTROY(client);
 609         free(parms.r_addr);
 610         return (rslt);
 611 }
 612
 613 /*
 614  * Remove the mapping between program, version and netbuf address.
 615  * Calls the rpcbind service to do the un-mapping.
 616  * If netbuf is NULL, unset for all the transports, otherwise unset
 617  * only for the given transport.
 618  */
 619 bool_t
 620 rpcb_unset(program, version, nconf)
 621         rpcprog_t program;
 622         rpcvers_t version;
 623         const struct netconfig *nconf;
 624 {
 625         CLIENT *client;
 626         bool_t rslt = FALSE;
 627         RPCB parms;
 628         char uidbuf[32];
 629
 630         client = local_rpcb();
 631         if (! client) {
 632                 return (FALSE);
 633         }
 634
 635         parms.r_prog = program;
 636         parms.r_vers = version;
 637         if (nconf)
 638                 parms.r_netid = nconf->nc_netid;
 639         else {
 640                 /*LINTED const castaway*/
 641                 parms.r_netid = (char *) &nullstring[0]; /* unsets  all */
 642         }
 643         /*LINTED const castaway*/
 644         parms.r_addr = (char *) &nullstring[0];
 645         (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid());
 646         parms.r_owner = uidbuf;
 647
 648         CLNT_CALL(client, (rpcproc_t)RPCBPROC_UNSET, (xdrproc_t) xdr_rpcb,
 649             (char *)(void *)&parms, (xdrproc_t) xdr_bool,
 650             (char *)(void *)&rslt, tottimeout);
 651
 652         CLNT_DESTROY(client);
 653         return (rslt);
 654 }
 655
 656 /*
 657  * From the merged list, find the appropriate entry
 658  */
 659 static struct netbuf *
 660 got_entry(relp, nconf)
 661         rpcb_entry_list_ptr relp;
 662         const struct netconfig *nconf;
 663 {
 664         struct netbuf *na = NULL;
 665         rpcb_entry_list_ptr sp;
 666         rpcb_entry *rmap;
 667
 668         for (sp = relp; sp != NULL; sp = sp->rpcb_entry_next) {
 669                 rmap = &sp->rpcb_entry_map;
 670                 if ((strcmp(nconf->nc_proto, rmap->r_nc_proto) == 0) &&
 671                     (strcmp(nconf->nc_protofmly, rmap->r_nc_protofmly) == 0) &&
 672                     (nconf->nc_semantics == rmap->r_nc_semantics) &&
 673                     (rmap->r_maddr != NULL) && (rmap->r_maddr[0] != 0)) {
 674                         na = uaddr2taddr(nconf, rmap->r_maddr);
 675 #ifdef ND_DEBUG
 676                         fprintf(stderr, "\tRemote address is [%s].\n",
 677                                 rmap->r_maddr);
 678                         if (!na)
 679                                 fprintf(stderr,
 680                                     "\tCouldn't resolve remote address!\n");
 681 #endif
 682                         break;
 683                 }
 684         }
 685         return (na);
 686 }
 687
 688 /*
 689  * Quick check to see if rpcbind is up.  Tries to connect over
 690  * local transport.
 691  */
 692 static bool_t
 693 __rpcbind_is_up()
 694 {
 695         struct netconfig *nconf;
 696         struct sockaddr_un sun;
 697         void *localhandle;
 698         int sock;
 699
 700         nconf = NULL;
 701         localhandle = setnetconfig();
 702         while ((nconf = getnetconfig(localhandle)) != NULL) {
 703                 if (nconf->nc_protofmly != NULL &&
 704                     strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0)
 705                          break;
 706         }
 707         if (nconf == NULL)
 708                 return (FALSE);
 709
 710         endnetconfig(localhandle);
 711
 712         memset(&sun, 0, sizeof sun);
 713         sock = _socket(AF_LOCAL, SOCK_STREAM, 0);
 714         if (sock < 0)
 715                 return (FALSE);
 716         sun.sun_family = AF_LOCAL;
 717         strncpy(sun.sun_path, _PATH_RPCBINDSOCK, sizeof(sun.sun_path));
 718         sun.sun_len = SUN_LEN(&sun);
 719
 720         if (_connect(sock, (struct sockaddr *)&sun, sun.sun_len) < 0) {
 721                 _close(sock);
 722                 return (FALSE);
 723         }
 724
 725         _close(sock);
 726         return (TRUE);
 727 }
 728
 729 /*
 730  * An internal function which optimizes rpcb_getaddr function.  It also
 731  * returns the client handle that it uses to contact the remote rpcbind.
 732  *
 733  * The algorithm used: If the transports is TCP or UDP, it first tries
 734  * version 2 (portmap), 4 and then 3 (svr4).  This order should be
 735  * changed in the next OS release to 4, 2 and 3.  We are assuming that by
 736  * that time, version 4 would be available on many machines on the network.
 737  * With this algorithm, we get performance as well as a plan for
 738  * obsoleting version 2.
 739  *
 740  * For all other transports, the algorithm remains as 4 and then 3.
 741  *
 742  * XXX: Due to some problems with t_connect(), we do not reuse the same client
 743  * handle for COTS cases and hence in these cases we do not return the
 744  * client handle.  This code will change if t_connect() ever
 745  * starts working properly.  Also look under clnt_vc.c.
 746  */
 747 struct netbuf *
 748 __rpcb_findaddr_timed(program, version, nconf, host, clpp, tp)
 749         rpcprog_t program;
 750         rpcvers_t version;
 751         const struct netconfig *nconf;
 752         const char *host;
 753         CLIENT **clpp;
 754         struct timeval *tp;
 755 {
 756         static bool_t check_rpcbind = TRUE;
 757         CLIENT *client = NULL;
 758         RPCB parms;
 759         enum clnt_stat clnt_st;
 760         char *ua = NULL;
 761         rpcvers_t vers;
 762         struct netbuf *address = NULL;
 763         rpcvers_t start_vers = RPCBVERS4;
 764         struct netbuf servaddr;
 765
 766         /* parameter checking */
 767         if (nconf == NULL) {
 768                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 769                 return (NULL);
 770         }
 771
 772         parms.r_addr = NULL;
 773
 774         /*
 775          * Use default total timeout if no timeout is specified.
 776          */
 777         if (tp == NULL)
 778                 tp = &tottimeout;
 779
 780 #ifdef PORTMAP
 781         /* Try version 2 for TCP or UDP */
 782         if (strcmp(nconf->nc_protofmly, NC_INET) == 0) {
 783                 u_short port = 0;
 784                 struct netbuf remote;
 785                 rpcvers_t pmapvers = 2;
 786                 struct pmap pmapparms;
 787
 788                 /*
 789                  * Try UDP only - there are some portmappers out
 790                  * there that use UDP only.
 791                  */
 792                 if (strcmp(nconf->nc_proto, NC_TCP) == 0) {
 793                         struct netconfig *newnconf;
 794
 795                         if ((newnconf = getnetconfigent("udp")) == NULL) {
 796                                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 797                                 return (NULL);
 798                         }
 799                         client = getclnthandle(host, newnconf, &parms.r_addr);
 800                         freenetconfigent(newnconf);
 801                 } else {
 802                         client = getclnthandle(host, nconf, &parms.r_addr);
 803                 }
 804                 if (client == NULL)
 805                         return (NULL);
 806
 807                 /*
 808                  * Set version and retry timeout.
 809                  */
 810                 CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *)&rpcbrmttime);
 811                 CLNT_CONTROL(client, CLSET_VERS, (char *)&pmapvers);
 812
 813                 pmapparms.pm_prog = program;
 814                 pmapparms.pm_vers = version;
 815                 pmapparms.pm_prot = strcmp(nconf->nc_proto, NC_TCP) ?
 816                                         IPPROTO_UDP : IPPROTO_TCP;
 817                 pmapparms.pm_port = 0;  /* not needed */
 818                 clnt_st = CLNT_CALL(client, (rpcproc_t)PMAPPROC_GETPORT,
 819                     (xdrproc_t) xdr_pmap, (caddr_t)(void *)&pmapparms,
 820                     (xdrproc_t) xdr_u_short, (caddr_t)(void *)&port,
 821                     *tp);
 822                 if (clnt_st != RPC_SUCCESS) {
 823                         if ((clnt_st == RPC_PROGVERSMISMATCH) ||
 824                                 (clnt_st == RPC_PROGUNAVAIL))
 825                                 goto try_rpcbind; /* Try different versions */
 826                         rpc_createerr.cf_stat = RPC_PMAPFAILURE;
 827                         clnt_geterr(client, &rpc_createerr.cf_error);
 828                         goto error;
 829                 } else if (port == 0) {
 830                         address = NULL;
 831                         rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
 832                         goto error;
 833                 }
 834                 port = htons(port);
 835                 CLNT_CONTROL(client, CLGET_SVC_ADDR, (char *)&remote);
 836                 if (((address = (struct netbuf *)
 837                         malloc(sizeof (struct netbuf))) == NULL) ||
 838                     ((address->buf = (char *)
 839                         malloc(remote.len)) == NULL)) {
 840                         rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 841                         clnt_geterr(client, &rpc_createerr.cf_error);
 842                         if (address) {
 843                                 free(address);
 844                                 address = NULL;
 845                         }
 846                         goto error;
 847                 }
 848                 memcpy(address->buf, remote.buf, remote.len);
 849                 memcpy(&((char *)address->buf)[sizeof (short)],
 850                                 (char *)(void *)&port, sizeof (short));
 851                 address->len = address->maxlen = remote.len;
 852                 goto done;
 853         }
 854 #endif                          /* PORTMAP */
 855
 856 try_rpcbind:
 857         /*
 858          * Check if rpcbind is up.  This prevents needless delays when
 859          * accessing applications such as the keyserver while booting
 860          * disklessly.
 861          */
 862         if (check_rpcbind && strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) {
 863                 if (!__rpcbind_is_up()) {
 864                         rpc_createerr.cf_stat = RPC_PMAPFAILURE;
 865                         rpc_createerr.cf_error.re_errno = 0;
 866                         goto error;
 867                 }
 868                 check_rpcbind = FALSE;
 869         }
 870
 871         /*
 872          * Now we try version 4 and then 3.
 873          * We also send the remote system the address we used to
 874          * contact it in case it can help to connect back with us
 875          */
 876         parms.r_prog = program;
 877         parms.r_vers = version;
 878         /*LINTED const castaway*/
 879         parms.r_owner = (char *) &nullstring[0];        /* not needed; */
 880                                                         /* just for xdring */
 881         parms.r_netid = nconf->nc_netid; /* not really needed */
 882
 883         /*
 884          * If a COTS transport is being used, try getting address via CLTS
 885          * transport.  This works only with version 4.
 886          */
 887         if (nconf->nc_semantics == NC_TPI_COTS_ORD ||
 888                         nconf->nc_semantics == NC_TPI_COTS) {
 889
 890                 void *handle;
 891                 struct netconfig *nconf_clts;
 892                 rpcb_entry_list_ptr relp = NULL;
 893
 894                 if (client == NULL) {
 895                         /* This did not go through the above PORTMAP/TCP code */
 896                         if ((handle = __rpc_setconf("datagram_v")) != NULL) {
 897                                 while ((nconf_clts = __rpc_getconf(handle))
 898                                         != NULL) {
 899                                         if (strcmp(nconf_clts->nc_protofmly,
 900                                                 nconf->nc_protofmly) != 0) {
 901                                                 continue;
 902                                         }
 903                                         client = getclnthandle(host, nconf_clts,
 904                                                         &parms.r_addr);
 905                                         break;
 906                                 }
 907                                 __rpc_endconf(handle);
 908                         }
 909                         if (client == NULL)
 910                                 goto regular_rpcbind;   /* Go the regular way */
 911                 } else {
 912                         /* This is a UDP PORTMAP handle.  Change to version 4 */
 913                         vers = RPCBVERS4;
 914                         CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers);
 915                 }
 916                 /*
 917                  * We also send the remote system the address we used to
 918                  * contact it in case it can help it connect back with us
 919                  */
 920                 if (parms.r_addr == NULL) {
 921                         /*LINTED const castaway*/
 922                         parms.r_addr = (char *) &nullstring[0]; /* for XDRing */
 923                 }
 924
 925                 CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *)&rpcbrmttime);
 926
 927                 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDRLIST,
 928                     (xdrproc_t) xdr_rpcb, (char *)(void *)&parms,
 929                     (xdrproc_t) xdr_rpcb_entry_list_ptr,
 930                     (char *)(void *)&relp, *tp);
 931                 if (clnt_st == RPC_SUCCESS) {
 932                         if ((address = got_entry(relp, nconf)) != NULL) {
 933                                 xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr,
 934                                     (char *)(void *)&relp);
 935                                 CLNT_CONTROL(client, CLGET_SVC_ADDR,
 936                                         (char *)(void *)&servaddr);
 937                                 __rpc_fixup_addr(address, &servaddr);
 938                                 goto done;
 939                         }
 940                         /* Entry not found for this transport */
 941                         xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr,
 942                             (char *)(void *)&relp);
 943                         /*
 944                          * XXX: should have perhaps returned with error but
 945                          * since the remote machine might not always be able
 946                          * to send the address on all transports, we try the
 947                          * regular way with regular_rpcbind
 948                          */
 949                         goto regular_rpcbind;
 950                 } else if ((clnt_st == RPC_PROGVERSMISMATCH) ||
 951                         (clnt_st == RPC_PROGUNAVAIL)) {
 952                         start_vers = RPCBVERS;  /* Try version 3 now */
 953                         goto regular_rpcbind; /* Try different versions */
 954                 } else {
 955                         rpc_createerr.cf_stat = RPC_PMAPFAILURE;
 956                         clnt_geterr(client, &rpc_createerr.cf_error);
 957                         goto error;
 958                 }
 959         }
 960
 961 regular_rpcbind:
 962
 963         /* Now the same transport is to be used to get the address */
 964         if (client && ((nconf->nc_semantics == NC_TPI_COTS_ORD) ||
 965                         (nconf->nc_semantics == NC_TPI_COTS))) {
 966                 /* A CLTS type of client - destroy it */
 967                 CLNT_DESTROY(client);
 968                 client = NULL;
 969         }
 970
 971         if (client == NULL) {
 972                 client = getclnthandle(host, nconf, &parms.r_addr);
 973                 if (client == NULL) {
 974                         goto error;
 975                 }
 976         }
 977         if (parms.r_addr == NULL) {
 978                 /*LINTED const castaway*/
 979                 parms.r_addr = (char *) &nullstring[0];
 980         }
 981
 982         /* First try from start_vers and then version 3 (RPCBVERS) */
 983
 984         CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *) &rpcbrmttime);
 985         for (vers = start_vers;  vers >= RPCBVERS; vers--) {
 986                 /* Set the version */
 987                 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers);
 988                 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDR,
 989                     (xdrproc_t) xdr_rpcb, (char *)(void *)&parms,
 990                     (xdrproc_t) xdr_wrapstring, (char *)(void *) &ua, *tp);
 991                 if (clnt_st == RPC_SUCCESS) {
 992                         if ((ua == NULL) || (ua[0] == 0)) {
 993                                 /* address unknown */
 994                                 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
 995                                 goto error;
 996                         }
 997                         address = uaddr2taddr(nconf, ua);
 998 #ifdef ND_DEBUG
 999                         fprintf(stderr, "\tRemote address is [%s]\n", ua);
1000                         if (!address)
1001                                 fprintf(stderr,
1002                                         "\tCouldn't resolve remote address!\n");
1003 #endif
1004                         xdr_free((xdrproc_t)xdr_wrapstring,
1005                             (char *)(void *)&ua);
1006
1007                         if (! address) {
1008                                 /* We don't know about your universal address */
1009                                 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE;
1010                                 goto error;
1011                         }
1012                         CLNT_CONTROL(client, CLGET_SVC_ADDR,
1013                             (char *)(void *)&servaddr);
1014                         __rpc_fixup_addr(address, &servaddr);
1015                         goto done;
1016                 } else if (clnt_st == RPC_PROGVERSMISMATCH) {
1017                         struct rpc_err rpcerr;
1018
1019                         clnt_geterr(client, &rpcerr);
1020                         if (rpcerr.re_vers.low > RPCBVERS4)
1021                                 goto error;  /* a new version, can't handle */
1022                 } else if (clnt_st != RPC_PROGUNAVAIL) {
1023                         /* Cant handle this error */
1024                         rpc_createerr.cf_stat = clnt_st;
1025                         clnt_geterr(client, &rpc_createerr.cf_error);
1026                         goto error;
1027                 }
1028         }
1029
1030 error:
1031         if (client) {
1032                 CLNT_DESTROY(client);
1033                 client = NULL;
1034         }
1035 done:
1036         if (nconf->nc_semantics != NC_TPI_CLTS) {
1037                 /* This client is the connectionless one */
1038                 if (client) {
1039                         CLNT_DESTROY(client);
1040                         client = NULL;
1041                 }
1042         }
1043         if (clpp) {
1044                 *clpp = client;
1045         } else if (client) {
1046                 CLNT_DESTROY(client);
1047         }
1048         if (parms.r_addr != NULL && parms.r_addr != nullstring)
1049                 free(parms.r_addr);
1050         return (address);
1051 }
1052
1053
1054 /*
1055  * Find the mapped address for program, version.
1056  * Calls the rpcbind service remotely to do the lookup.
1057  * Uses the transport specified in nconf.
1058  * Returns FALSE (0) if no map exists, else returns 1.
1059  *
1060  * Assuming that the address is all properly allocated
1061  */
1062 int
1063 rpcb_getaddr(program, version, nconf, address, host)
1064         rpcprog_t program;
1065         rpcvers_t version;
1066         const struct netconfig *nconf;
1067         struct netbuf *address;
1068         const char *host;
1069 {
1070         struct netbuf *na;
1071
1072         if ((na = __rpcb_findaddr_timed(program, version,
1073             (struct netconfig *) nconf, (char *) host,
1074             (CLIENT **) NULL, (struct timeval *) NULL)) == NULL)
1075                 return (FALSE);
1076
1077         if (na->len > address->maxlen) {
1078                 /* Too long address */
1079                 free(na->buf);
1080                 free(na);
1081                 rpc_createerr.cf_stat = RPC_FAILED;
1082                 return (FALSE);
1083         }
1084         memcpy(address->buf, na->buf, (size_t)na->len);
1085         address->len = na->len;
1086         free(na->buf);
1087         free(na);
1088         return (TRUE);
1089 }
1090
1091 /*
1092  * Get a copy of the current maps.
1093  * Calls the rpcbind service remotely to get the maps.
1094  *
1095  * It returns only a list of the services
1096  * It returns NULL on failure.
1097  */
1098 rpcblist *
1099 rpcb_getmaps(nconf, host)
1100         const struct netconfig *nconf;
1101         const char *host;
1102 {
1103         rpcblist_ptr head = NULL;
1104         CLIENT *client;
1105         enum clnt_stat clnt_st;
1106         rpcvers_t vers = 0;
1107
1108         client = getclnthandle(host, nconf, NULL);
1109         if (client == NULL) {
1110                 return (head);
1111         }
1112         clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP,
1113             (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr,
1114             (char *)(void *)&head, tottimeout);
1115         if (clnt_st == RPC_SUCCESS)
1116                 goto done;
1117
1118         if ((clnt_st != RPC_PROGVERSMISMATCH) &&
1119             (clnt_st != RPC_PROGUNAVAIL)) {
1120                 rpc_createerr.cf_stat = RPC_RPCBFAILURE;
1121                 clnt_geterr(client, &rpc_createerr.cf_error);
1122                 goto done;
1123         }
1124
1125         /* fall back to earlier version */
1126         CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers);
1127         if (vers == RPCBVERS4) {
1128                 vers = RPCBVERS;
1129                 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers);
1130                 if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP,
1131                     (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr,
1132                     (char *)(void *)&head, tottimeout) == RPC_SUCCESS)
1133                         goto done;
1134         }
1135         rpc_createerr.cf_stat = RPC_RPCBFAILURE;
1136         clnt_geterr(client, &rpc_createerr.cf_error);
1137
1138 done:
1139         CLNT_DESTROY(client);
1140         return (head);
1141 }
1142
1143 /*
1144  * rpcbinder remote-call-service interface.
1145  * This routine is used to call the rpcbind remote call service
1146  * which will look up a service program in the address maps, and then
1147  * remotely call that routine with the given parameters. This allows
1148  * programs to do a lookup and call in one step.
1149 */
1150 enum clnt_stat
1151 rpcb_rmtcall(nconf, host, prog, vers, proc, xdrargs, argsp,
1152                 xdrres, resp, tout, addr_ptr)
1153         const struct netconfig *nconf;  /* Netconfig structure */
1154         const char *host;                       /* Remote host name */
1155         rpcprog_t prog;
1156         rpcvers_t vers;
1157         rpcproc_t proc;                 /* Remote proc identifiers */
1158         xdrproc_t xdrargs, xdrres;      /* XDR routines */
1159         caddr_t argsp, resp;            /* Argument and Result */
1160         struct timeval tout;            /* Timeout value for this call */
1161         const struct netbuf *addr_ptr;  /* Preallocated netbuf address */
1162 {
1163         CLIENT *client;
1164         enum clnt_stat stat;
1165         struct r_rpcb_rmtcallargs a;
1166         struct r_rpcb_rmtcallres r;
1167         rpcvers_t rpcb_vers;
1168
1169         stat = 0;
1170         client = getclnthandle(host, nconf, NULL);
1171         if (client == NULL) {
1172                 return (RPC_FAILED);
1173         }
1174         /*LINTED const castaway*/
1175         CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *)(void *)&rmttimeout);
1176         a.prog = prog;
1177         a.vers = vers;
1178         a.proc = proc;
1179         a.args.args_val = argsp;
1180         a.xdr_args = xdrargs;
1181         r.addr = NULL;
1182         r.results.results_val = resp;
1183         r.xdr_res = xdrres;
1184
1185         for (rpcb_vers = RPCBVERS4; rpcb_vers >= RPCBVERS; rpcb_vers--) {
1186                 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&rpcb_vers);
1187                 stat = CLNT_CALL(client, (rpcproc_t)RPCBPROC_CALLIT,
1188                     (xdrproc_t) xdr_rpcb_rmtcallargs, (char *)(void *)&a,
1189                     (xdrproc_t) xdr_rpcb_rmtcallres, (char *)(void *)&r, tout);
1190                 if ((stat == RPC_SUCCESS) && (addr_ptr != NULL)) {
1191                         struct netbuf *na;
1192                         /*LINTED const castaway*/
1193                         na = uaddr2taddr((struct netconfig *) nconf, r.addr);
1194                         if (!na) {
1195                                 stat = RPC_N2AXLATEFAILURE;
1196                                 /*LINTED const castaway*/
1197                                 ((struct netbuf *) addr_ptr)->len = 0;
1198                                 goto error;
1199                         }
1200                         if (na->len > addr_ptr->maxlen) {
1201                                 /* Too long address */
1202                                 stat = RPC_FAILED; /* XXX A better error no */
1203                                 free(na->buf);
1204                                 free(na);
1205                                 /*LINTED const castaway*/
1206                                 ((struct netbuf *) addr_ptr)->len = 0;
1207                                 goto error;
1208                         }
1209                         memcpy(addr_ptr->buf, na->buf, (size_t)na->len);
1210                         /*LINTED const castaway*/
1211                         ((struct netbuf *)addr_ptr)->len = na->len;
1212                         free(na->buf);
1213                         free(na);
1214                         break;
1215                 } else if ((stat != RPC_PROGVERSMISMATCH) &&
1216                             (stat != RPC_PROGUNAVAIL)) {
1217                         goto error;
1218                 }
1219         }
1220 error:
1221         CLNT_DESTROY(client);
1222         if (r.addr)
1223                 xdr_free((xdrproc_t) xdr_wrapstring, (char *)(void *)&r.addr);
1224         return (stat);
1225 }
1226
1227 /*
1228  * Gets the time on the remote host.
1229  * Returns 1 if succeeds else 0.
1230  */
1231 bool_t
1232 rpcb_gettime(host, timep)
1233         const char *host;
1234         time_t *timep;
1235 {
1236         CLIENT *client = NULL;
1237         void *handle;
1238         struct netconfig *nconf;
1239         rpcvers_t vers;
1240         enum clnt_stat st;
1241
1242
1243         if ((host == NULL) || (host[0] == 0)) {
1244                 time(timep);
1245                 return (TRUE);
1246         }
1247
1248         if ((handle = __rpc_setconf("netpath")) == NULL) {
1249                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
1250                 return (FALSE);
1251         }
1252         rpc_createerr.cf_stat = RPC_SUCCESS;
1253         while (client == NULL) {
1254                 if ((nconf = __rpc_getconf(handle)) == NULL) {
1255                         if (rpc_createerr.cf_stat == RPC_SUCCESS)
1256                                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
1257                         break;
1258                 }
1259                 client = getclnthandle(host, nconf, NULL);
1260                 if (client)
1261                         break;
1262         }
1263         __rpc_endconf(handle);
1264         if (client == (CLIENT *) NULL) {
1265                 return (FALSE);
1266         }
1267
1268         st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME,
1269                 (xdrproc_t) xdr_void, NULL,
1270                 (xdrproc_t) xdr_int, (char *)(void *)timep, tottimeout);
1271
1272         if ((st == RPC_PROGVERSMISMATCH) || (st == RPC_PROGUNAVAIL)) {
1273                 CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers);
1274                 if (vers == RPCBVERS4) {
1275                         /* fall back to earlier version */
1276                         vers = RPCBVERS;
1277                         CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers);
1278                         st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME,
1279                                 (xdrproc_t) xdr_void, NULL,
1280                                 (xdrproc_t) xdr_int, (char *)(void *)timep,
1281                                 tottimeout);
1282                 }
1283         }
1284         CLNT_DESTROY(client);
1285         return (st == RPC_SUCCESS? TRUE: FALSE);
1286 }
1287
1288 /*
1289  * Converts taddr to universal address.  This routine should never
1290  * really be called because local n2a libraries are always provided.
1291  */
1292 char *
1293 rpcb_taddr2uaddr(nconf, taddr)
1294         struct netconfig *nconf;
1295         struct netbuf *taddr;
1296 {
1297         CLIENT *client;
1298         char *uaddr = NULL;
1299
1300
1301         /* parameter checking */
1302         if (nconf == NULL) {
1303                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
1304                 return (NULL);
1305         }
1306         if (taddr == NULL) {
1307                 rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
1308                 return (NULL);
1309         }
1310         client = local_rpcb();
1311         if (! client) {
1312                 return (NULL);
1313         }
1314
1315         CLNT_CALL(client, (rpcproc_t)RPCBPROC_TADDR2UADDR,
1316             (xdrproc_t) xdr_netbuf, (char *)(void *)taddr,
1317             (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr, tottimeout);
1318         CLNT_DESTROY(client);
1319         return (uaddr);
1320 }
1321
1322 /*
1323  * Converts universal address to netbuf.  This routine should never
1324  * really be called because local n2a libraries are always provided.
1325  */
1326 struct netbuf *
1327 rpcb_uaddr2taddr(nconf, uaddr)
1328         struct netconfig *nconf;
1329         char *uaddr;
1330 {
1331         CLIENT *client;
1332         struct netbuf *taddr;
1333
1334
1335         /* parameter checking */
1336         if (nconf == NULL) {
1337                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
1338                 return (NULL);
1339         }
1340         if (uaddr == NULL) {
1341                 rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
1342                 return (NULL);
1343         }
1344         client = local_rpcb();
1345         if (! client) {
1346                 return (NULL);
1347         }
1348
1349         taddr = (struct netbuf *)calloc(1, sizeof (struct netbuf));
1350         if (taddr == NULL) {
1351                 CLNT_DESTROY(client);
1352                 return (NULL);
1353         }
1354         if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_UADDR2TADDR,
1355             (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr,
1356             (xdrproc_t) xdr_netbuf, (char *)(void *)taddr,
1357             tottimeout) != RPC_SUCCESS) {
1358                 free(taddr);
1359                 taddr = NULL;
1360         }
1361         CLNT_DESTROY(client);
1362         return (taddr);
1363 }