src/rpcb_clnt.c

   1 /*
   2  * Copyright (c) 2010, Oracle America, Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are met:
   7  * - Redistributions of source code must retain the above copyright notice,
   8  *   this list of conditions and the following disclaimer.
   9  * - Redistributions in binary form must reproduce the above copyright notice,
  10  *   this list of conditions and the following disclaimer in the documentation
  11  *   and/or other materials provided with the distribution.
  12  * - Neither the name of the "Oracle America, Inc." nor the names of its
  13  *   contributors may be used to endorse or promote products derived
  14  *   from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26  * POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 /*
  30  * rpcb_clnt.c
  31  * interface to rpcbind rpc service.
  32  */
  33 #include <pthread.h>
  34 #include <reentrant.h>
  35 #include <sys/types.h>
  36 #include <sys/socket.h>
  37 #include <sys/un.h>
  38 #include <sys/utsname.h>
  39 #include <rpc/rpc.h>
  40 #include <rpc/rpcb_prot.h>
  41 #include <rpc/nettype.h>
  42 #include <netconfig.h>
  43 #ifdef PORTMAP
  44 #include <netinet/in.h>         /* FOR IPPROTO_TCP/UDP definitions */
  45 #include <rpc/pmap_prot.h>
  46 #endif                          /* PORTMAP */
  47 #include <stdio.h>
  48 #include <errno.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <unistd.h>
  52 #include <netdb.h>
  53 #include <syslog.h>
  54 #include <assert.h>
  55
  56 #include "rpc_com.h"
  57 #include "debug.h"
  58
  59 static struct timeval tottimeout = { 60, 0 };
  60 static const struct timeval rmttimeout = { 3, 0 };
  61 static struct timeval rpcbrmttime = { 15, 0 };
  62
  63 extern bool_t xdr_wrapstring(XDR *, char **);
  64
  65 static const char nullstring[] = "\000";
  66
  67 #define RPCB_OWNER_STRING "libtirpc"
  68
  69 #define CACHESIZE 6
  70
  71 struct address_cache {
  72         char *ac_host;
  73         char *ac_netid;
  74         char *ac_uaddr;
  75         struct netbuf *ac_taddr;
  76         struct address_cache *ac_next;
  77 };
  78
  79 static struct address_cache *front;
  80 static int cachesize;
  81
  82 #define CLCR_GET_RPCB_TIMEOUT   1
  83 #define CLCR_SET_RPCB_TIMEOUT   2
  84
  85
  86 extern int __rpc_lowvers;
  87
  88 static struct address_cache *check_cache(const char *, const char *);
  89 static void delete_cache(struct netbuf *);
  90 static void add_cache(const char *, const char *, struct netbuf *, char *);
  91 static CLIENT *getclnthandle(const char *, const struct netconfig *, char **);
  92 static CLIENT *local_rpcb(void);
  93 #ifdef NOTUSED
  94 static struct netbuf *got_entry(rpcb_entry_list_ptr, const struct netconfig *);
  95 #endif
  96
  97 /*
  98  * This routine adjusts the timeout used for calls to the remote rpcbind.
  99  * Also, this routine can be used to set the use of portmapper version 2
 100  * only when doing rpc_broadcasts
 101  * These are private routines that may not be provided in future releases.
 102  */
 103 bool_t
 104 __rpc_control(request, info)
 105         int     request;
 106         void    *info;
 107 {
 108         switch (request) {
 109         case CLCR_GET_RPCB_TIMEOUT:
 110                 *(struct timeval *)info = tottimeout;
 111                 break;
 112         case CLCR_SET_RPCB_TIMEOUT:
 113                 tottimeout = *(struct timeval *)info;
 114                 break;
 115         case CLCR_SET_LOWVERS:
 116                 __rpc_lowvers = *(int *)info;
 117                 break;
 118         case CLCR_GET_LOWVERS:
 119                 *(int *)info = __rpc_lowvers;
 120                 break;
 121         default:
 122                 return (FALSE);
 123         }
 124         return (TRUE);
 125 }
 126
 127 /*
 128  *      It might seem that a reader/writer lock would be more reasonable here.
 129  *      However because getclnthandle(), the only user of the cache functions,
 130  *      may do a delete_cache() operation if a check_cache() fails to return an
 131  *      address useful to clnt_tli_create(), we may as well use a mutex.
 132  */
 133 /*
 134  * As it turns out, if the cache lock is *not* a reader/writer lock, we will
 135  * block all clnt_create's if we are trying to connect to a host that's down,
 136  * since the lock will be held all during that time.
 137  */
 138 extern rwlock_t rpcbaddr_cache_lock;
 139
 140 /*
 141  * The routines check_cache(), add_cache(), delete_cache() manage the
 142  * cache of rpcbind addresses for (host, netid).
 143  */
 144
 145 static struct address_cache *
 146 check_cache(host, netid)
 147         const char *host, *netid;
 148 {
 149         struct address_cache *cptr;
 150
 151         /* READ LOCK HELD ON ENTRY: rpcbaddr_cache_lock */
 152
 153         for (cptr = front; cptr != NULL; cptr = cptr->ac_next) {
 154                 if (!strcmp(cptr->ac_host, host) &&
 155                     !strcmp(cptr->ac_netid, netid)) {
 156                         LIBTIRPC_DEBUG(3, ("check_cache: Found cache entry for %s: %s\n",
 157                                 host, netid));
 158                         return (cptr);
 159                 }
 160         }
 161         return ((struct address_cache *) NULL);
 162 }
 163
 164 static void
 165 delete_cache(addr)
 166         struct netbuf *addr;
 167 {
 168         struct address_cache *cptr, *prevptr = NULL;
 169
 170         /* WRITE LOCK HELD ON ENTRY: rpcbaddr_cache_lock */
 171         for (cptr = front; cptr != NULL; cptr = cptr->ac_next) {
 172                 if (!memcmp(cptr->ac_taddr->buf, addr->buf, addr->len)) {
 173                         free(cptr->ac_host);
 174                         free(cptr->ac_netid);
 175                         free(cptr->ac_taddr->buf);
 176                         free(cptr->ac_taddr);
 177                         if (cptr->ac_uaddr)
 178                                 free(cptr->ac_uaddr);
 179                         if (prevptr)
 180                                 prevptr->ac_next = cptr->ac_next;
 181                         else
 182                                 front = cptr->ac_next;
 183                         free(cptr);
 184                         cachesize--;
 185                         break;
 186                 }
 187                 prevptr = cptr;
 188         }
 189 }
 190
 191 static void
 192 add_cache(host, netid, taddr, uaddr)
 193         const char *host, *netid;
 194         char *uaddr;
 195         struct netbuf *taddr;
 196 {
 197         struct address_cache  *ad_cache, *cptr, *prevptr;
 198
 199         ad_cache = (struct address_cache *)
 200                         malloc(sizeof (struct address_cache));
 201         if (!ad_cache) {
 202                 return;
 203         }
 204         ad_cache->ac_host = strdup(host);
 205         ad_cache->ac_netid = strdup(netid);
 206         ad_cache->ac_uaddr = uaddr ? strdup(uaddr) : NULL;
 207         ad_cache->ac_taddr = (struct netbuf *)malloc(sizeof (struct netbuf));
 208         if (!ad_cache->ac_host || !ad_cache->ac_netid || !ad_cache->ac_taddr ||
 209                         (uaddr && !ad_cache->ac_uaddr))
 210                 goto out_free;
 211         ad_cache->ac_taddr->len = ad_cache->ac_taddr->maxlen = taddr->len;
 212         ad_cache->ac_taddr->buf = (char *) malloc(taddr->len);
 213         if (ad_cache->ac_taddr->buf == NULL)
 214                 goto out_free;
 215         memcpy(ad_cache->ac_taddr->buf, taddr->buf, taddr->len);
 216         LIBTIRPC_DEBUG(3, ("add_cache: Added to cache: %s : %s\n", host, netid));
 217
 218 /* VARIABLES PROTECTED BY rpcbaddr_cache_lock:  cptr */
 219
 220         rwlock_wrlock(&rpcbaddr_cache_lock);
 221         if (cachesize < CACHESIZE) {
 222                 ad_cache->ac_next = front;
 223                 front = ad_cache;
 224                 cachesize++;
 225         } else {
 226                 /* Free the last entry */
 227                 cptr = front;
 228                 prevptr = NULL;
 229                 while (cptr->ac_next) {
 230                         prevptr = cptr;
 231                         cptr = cptr->ac_next;
 232                 }
 233
 234                 LIBTIRPC_DEBUG(3, ("add_cache: Deleted from cache: %s : %s\n",
 235                         cptr->ac_host, cptr->ac_netid));
 236                 free(cptr->ac_host);
 237                 free(cptr->ac_netid);
 238                 free(cptr->ac_taddr->buf);
 239                 free(cptr->ac_taddr);
 240                 if (cptr->ac_uaddr)
 241                         free(cptr->ac_uaddr);
 242
 243                 if (prevptr) {
 244                         prevptr->ac_next = NULL;
 245                         ad_cache->ac_next = front;
 246                         front = ad_cache;
 247                 } else {
 248                         front = ad_cache;
 249                         ad_cache->ac_next = NULL;
 250                 }
 251                 free(cptr);
 252         }
 253         rwlock_unlock(&rpcbaddr_cache_lock);
 254         return;
 255
 256 out_free:
 257         free(ad_cache->ac_host);
 258         free(ad_cache->ac_netid);
 259         free(ad_cache->ac_uaddr);
 260         free(ad_cache->ac_taddr);
 261         free(ad_cache);
 262 }
 263
 264 /*
 265  * This routine will return a client handle that is connected to the
 266  * rpcbind. If targaddr is non-NULL, the "universal address" of the
 267  * host will be stored in *targaddr; the caller is responsible for
 268  * freeing this string.
 269  * On error, returns NULL and free's everything.
 270  */
 271 static CLIENT *
 272 getclnthandle(host, nconf, targaddr)
 273         const char *host;
 274         const struct netconfig *nconf;
 275         char **targaddr;
 276 {
 277         CLIENT *client;
 278         struct netbuf *addr, taddr;
 279         struct netbuf addr_to_delete;
 280         struct __rpc_sockinfo si;
 281         struct addrinfo hints, *res, *tres;
 282         struct address_cache *ad_cache;
 283         char *tmpaddr;
 284
 285 /* VARIABLES PROTECTED BY rpcbaddr_cache_lock:  ad_cache */
 286
 287         /* Get the address of the rpcbind.  Check cache first */
 288         client = NULL;
 289         if (targaddr)
 290                 *targaddr = NULL;
 291         addr_to_delete.len = 0;
 292         rwlock_rdlock(&rpcbaddr_cache_lock);
 293         ad_cache = NULL;
 294         if (host != NULL)
 295                 ad_cache = check_cache(host, nconf->nc_netid);
 296         if (ad_cache != NULL) {
 297                 addr = ad_cache->ac_taddr;
 298                 client = clnt_tli_create(RPC_ANYFD, nconf, addr,
 299                     (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0);
 300                 if (client != NULL) {
 301                         if (targaddr)
 302                                 *targaddr = strdup(ad_cache->ac_uaddr);
 303                         rwlock_unlock(&rpcbaddr_cache_lock);
 304                         return (client);
 305                 }
 306                 addr_to_delete.len = addr->len;
 307                 addr_to_delete.buf = (char *)malloc(addr->len);
 308                 if (addr_to_delete.buf == NULL) {
 309                         addr_to_delete.len = 0;
 310                 } else {
 311                         memcpy(addr_to_delete.buf, addr->buf, addr->len);
 312                 }
 313         }
 314         rwlock_unlock(&rpcbaddr_cache_lock);
 315         if (addr_to_delete.len != 0) {
 316                 /*
 317                  * Assume this may be due to cache data being
 318                  *  outdated
 319                  */
 320                 rwlock_wrlock(&rpcbaddr_cache_lock);
 321                 delete_cache(&addr_to_delete);
 322                 rwlock_unlock(&rpcbaddr_cache_lock);
 323                 free(addr_to_delete.buf);
 324         }
 325         if (!__rpc_nconf2sockinfo(nconf, &si)) {
 326                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 327                 assert(client == NULL);
 328                 goto out_err;
 329         }
 330
 331         memset(&hints, 0, sizeof hints);
 332         hints.ai_family = si.si_af;
 333         hints.ai_socktype = si.si_socktype;
 334         hints.ai_protocol = si.si_proto;
 335
 336         LIBTIRPC_DEBUG(3, ("getclnthandle: trying netid %s family %d proto %d socktype %d\n",
 337             nconf->nc_netid, si.si_af, si.si_proto, si.si_socktype));
 338
 339         if (nconf->nc_protofmly != NULL && strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) {
 340                 client = local_rpcb();
 341                 if (! client) {
 342                         LIBTIRPC_DEBUG(1, ("getclnthandle: %s",
 343                                 clnt_spcreateerror("local_rpcb failed")));
 344                         goto out_err;
 345                 } else {
 346                         struct sockaddr_un sun;
 347
 348                         *targaddr = malloc(sizeof(sun.sun_path));
 349                         strncpy(*targaddr, _PATH_RPCBINDSOCK,
 350                             sizeof(sun.sun_path));
 351                         return (client);
 352                 }
 353         } else {
 354                 if (getaddrinfo(host, "sunrpc", &hints, &res) != 0) {
 355                         rpc_createerr.cf_stat = RPC_UNKNOWNHOST;
 356                         assert(client == NULL);
 357                         goto out_err;
 358                 }
 359         }
 360
 361         for (tres = res; tres != NULL; tres = tres->ai_next) {
 362                 taddr.buf = tres->ai_addr;
 363                 taddr.len = taddr.maxlen = tres->ai_addrlen;
 364
 365                 if (libtirpc_debug_level > 3 && log_stderr) {
 366                         char *ua;
 367                         int i;
 368
 369                         ua = taddr2uaddr(nconf, &taddr);
 370                         fprintf(stderr, "Got it [%s]\n", ua);
 371                         free(ua);
 372
 373                         fprintf(stderr, "\tnetbuf len = %d, maxlen = %d\n",
 374                                 taddr.len, taddr.maxlen);
 375                         fprintf(stderr, "\tAddress is ");
 376                         for (i = 0; i < taddr.len; i++)
 377                                 fprintf(stderr, "%u.", ((char *)(taddr.buf))[i]);
 378                         fprintf(stderr, "\n");
 379                 }
 380
 381                 client = clnt_tli_create(RPC_ANYFD, nconf, &taddr,
 382                     (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0);
 383                 if (! client) {
 384                         LIBTIRPC_DEBUG(1, ("getclnthandle: %s",
 385                                 clnt_spcreateerror("clnt_tli_create failed")));
 386                 }
 387
 388                 if (client) {
 389                         tmpaddr = targaddr ? taddr2uaddr(nconf, &taddr) : NULL;
 390                         add_cache(host, nconf->nc_netid, &taddr, tmpaddr);
 391                         if (targaddr)
 392                                 *targaddr = tmpaddr;
 393                         break;
 394                 }
 395         }
 396         if (res)
 397                 freeaddrinfo(res);
 398 out_err:
 399         if (!client && targaddr)
 400                 free(*targaddr);
 401         return (client);
 402 }
 403
 404 /* XXX */
 405 #define IN4_LOCALHOST_STRING    "127.0.0.1"
 406 #define IN6_LOCALHOST_STRING    "::1"
 407
 408 /*
 409  * This routine will return a client handle that is connected to the local
 410  * rpcbind. Returns NULL on error and free's everything.
 411  */
 412 static CLIENT *
 413 local_rpcb()
 414 {
 415         CLIENT *client;
 416         static struct netconfig *loopnconf;
 417         static char *hostname;
 418         extern mutex_t loopnconf_lock;
 419         int sock;
 420         size_t tsize;
 421         struct netbuf nbuf;
 422         struct sockaddr_un sun;
 423
 424         /*
 425          * Try connecting to the local rpcbind through a local socket
 426          * first. If this doesn't work, try all transports defined in
 427          * the netconfig file.
 428          */
 429         memset(&sun, 0, sizeof sun);
 430         sock = socket(AF_LOCAL, SOCK_STREAM, 0);
 431         if (sock < 0)
 432                 goto try_nconf;
 433         sun.sun_family = AF_LOCAL;
 434         strcpy(sun.sun_path, _PATH_RPCBINDSOCK);
 435         nbuf.len = SUN_LEN(&sun);
 436         nbuf.maxlen = sizeof (struct sockaddr_un);
 437         nbuf.buf = &sun;
 438
 439         tsize = __rpc_get_t_size(AF_LOCAL, 0, 0);
 440         client = clnt_vc_create(sock, &nbuf, (rpcprog_t)RPCBPROG,
 441             (rpcvers_t)RPCBVERS, tsize, tsize);
 442
 443         if (client != NULL) {
 444                 /* Mark the socket to be closed in destructor */
 445                 (void) CLNT_CONTROL(client, CLSET_FD_CLOSE, NULL);
 446                 return client;
 447         }
 448
 449         /* Nobody needs this socket anymore; free the descriptor. */
 450         close(sock);
 451
 452 try_nconf:
 453
 454 /* VARIABLES PROTECTED BY loopnconf_lock: loopnconf */
 455         mutex_lock(&loopnconf_lock);
 456         if (loopnconf == NULL) {
 457                 struct netconfig *nconf, *tmpnconf = NULL;
 458                 void *nc_handle;
 459                 int fd;
 460
 461                 nc_handle = setnetconfig();
 462                 if (nc_handle == NULL) {
 463                         /* fails to open netconfig file */
 464                         syslog (LOG_ERR, "rpc: failed to open " NETCONFIG);
 465                         rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 466                         mutex_unlock(&loopnconf_lock);
 467                         return (NULL);
 468                 }
 469                 while ((nconf = getnetconfig(nc_handle)) != NULL) {
 470 #ifdef INET6
 471                         if ((strcmp(nconf->nc_protofmly, NC_INET6) == 0 ||
 472 #else
 473                         if ((
 474 #endif
 475                              strcmp(nconf->nc_protofmly, NC_INET) == 0) &&
 476                             (nconf->nc_semantics == NC_TPI_COTS ||
 477                              nconf->nc_semantics == NC_TPI_COTS_ORD)) {
 478                                 fd = __rpc_nconf2fd(nconf);
 479                                 /*
 480                                  * Can't create a socket, assume that
 481                                  * this family isn't configured in the kernel.
 482                                  */
 483                                 if (fd < 0)
 484                                         continue;
 485                                 close(fd);
 486                                 tmpnconf = nconf;
 487                                 if (!strcmp(nconf->nc_protofmly, NC_INET))
 488                                         hostname = IN4_LOCALHOST_STRING;
 489                                 else
 490                                         hostname = IN6_LOCALHOST_STRING;
 491                         }
 492                 }
 493                 if (tmpnconf == NULL) {
 494                         rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 495                         mutex_unlock(&loopnconf_lock);
 496                         return (NULL);
 497                 }
 498                 loopnconf = getnetconfigent(tmpnconf->nc_netid);
 499                 /* loopnconf is never freed */
 500                 endnetconfig(nc_handle);
 501         }
 502         mutex_unlock(&loopnconf_lock);
 503         client = getclnthandle(hostname, loopnconf, NULL);
 504         return (client);
 505 }
 506
 507 /*
 508  * Set a mapping between program, version and address.
 509  * Calls the rpcbind service to do the mapping.
 510  */
 511 bool_t
 512 rpcb_set(program, version, nconf, address)
 513         rpcprog_t program;
 514         rpcvers_t version;
 515         const struct netconfig *nconf;  /* Network structure of transport */
 516         const struct netbuf *address;           /* Services netconfig address */
 517 {
 518         CLIENT *client;
 519         bool_t rslt = FALSE;
 520         RPCB parms;
 521         char uidbuf[32];
 522
 523         /* parameter checking */
 524         if (nconf == NULL) {
 525                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 526                 return (FALSE);
 527         }
 528         if (address == NULL) {
 529                 rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
 530                 return (FALSE);
 531         }
 532         client = local_rpcb();
 533         if (! client) {
 534                 return (FALSE);
 535         }
 536
 537         /* convert to universal */
 538         /*LINTED const castaway*/
 539         parms.r_addr = taddr2uaddr((struct netconfig *) nconf,
 540                                    (struct netbuf *)address);
 541         if (!parms.r_addr) {
 542                 CLNT_DESTROY(client);
 543                 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE;
 544                 return (FALSE); /* no universal address */
 545         }
 546         parms.r_prog = program;
 547         parms.r_vers = version;
 548         parms.r_netid = nconf->nc_netid;
 549         /*
 550          * Though uid is not being used directly, we still send it for
 551          * completeness.  For non-unix platforms, perhaps some other
 552          * string or an empty string can be sent.
 553          */
 554         (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid());
 555         parms.r_owner = uidbuf;
 556
 557         CLNT_CALL(client, (rpcproc_t)RPCBPROC_SET, (xdrproc_t) xdr_rpcb,
 558             (char *)&parms, (xdrproc_t) xdr_bool,
 559             (char *)&rslt, tottimeout);
 560
 561         CLNT_DESTROY(client);
 562         free(parms.r_addr);
 563         return (rslt);
 564 }
 565
 566 /*
 567  * Remove the mapping between program, version and netbuf address.
 568  * Calls the rpcbind service to do the un-mapping.
 569  * If netbuf is NULL, unset for all the transports, otherwise unset
 570  * only for the given transport.
 571  */
 572 bool_t
 573 rpcb_unset(program, version, nconf)
 574         rpcprog_t program;
 575         rpcvers_t version;
 576         const struct netconfig *nconf;
 577 {
 578         CLIENT *client;
 579         bool_t rslt = FALSE;
 580         RPCB parms;
 581         char uidbuf[32];
 582
 583         client = local_rpcb();
 584         if (! client) {
 585                 return (FALSE);
 586         }
 587
 588         parms.r_prog = program;
 589         parms.r_vers = version;
 590         if (nconf)
 591                 parms.r_netid = nconf->nc_netid;
 592         else {
 593                 /*LINTED const castaway*/
 594                 parms.r_netid = (char *) &nullstring[0]; /* unsets  all */
 595         }
 596         /*LINTED const castaway*/
 597         parms.r_addr = (char *) &nullstring[0];
 598         (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid());
 599         parms.r_owner = uidbuf;
 600
 601         CLNT_CALL(client, (rpcproc_t)RPCBPROC_UNSET, (xdrproc_t) xdr_rpcb,
 602             (char *)(void *)&parms, (xdrproc_t) xdr_bool,
 603             (char *)(void *)&rslt, tottimeout);
 604
 605         CLNT_DESTROY(client);
 606         return (rslt);
 607 }
 608
 609 #ifdef NOTUSED
 610 /*
 611  * From the merged list, find the appropriate entry
 612  */
 613 static struct netbuf *
 614 got_entry(relp, nconf)
 615         rpcb_entry_list_ptr relp;
 616         const struct netconfig *nconf;
 617 {
 618         struct netbuf *na = NULL;
 619         rpcb_entry_list_ptr sp;
 620         rpcb_entry *rmap;
 621
 622         for (sp = relp; sp != NULL; sp = sp->rpcb_entry_next) {
 623                 rmap = &sp->rpcb_entry_map;
 624                 if ((strcmp(nconf->nc_proto, rmap->r_nc_proto) == 0) &&
 625                     (strcmp(nconf->nc_protofmly, rmap->r_nc_protofmly) == 0) &&
 626                     (nconf->nc_semantics == rmap->r_nc_semantics) &&
 627                     (rmap->r_maddr != NULL) && (rmap->r_maddr[0] != 0)) {
 628                         na = uaddr2taddr(nconf, rmap->r_maddr);
 629                         LIBTIRPC_DEBUG(3, ("got_entry: Remote address is [%s] %s",
 630                                 rmap->r_maddr, (na ? "Resolvable" : "Not Resolvable")));
 631                         break;
 632                 }
 633         }
 634         return (na);
 635 }
 636
 637 /*
 638  * Quick check to see if rpcbind is up.  Tries to connect over
 639  * local transport.
 640  */
 641 bool_t
 642 __rpcbind_is_up()
 643 {
 644         struct netconfig *nconf;
 645         struct sockaddr_un sun;
 646         void *localhandle;
 647         int sock;
 648
 649         nconf = NULL;
 650         localhandle = setnetconfig();
 651         while ((nconf = getnetconfig(localhandle)) != NULL) {
 652                 if (nconf->nc_protofmly != NULL &&
 653                     strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0)
 654                          break;
 655         }
 656         if (nconf == NULL)
 657                 return (FALSE);
 658
 659         endnetconfig(localhandle);
 660
 661         memset(&sun, 0, sizeof sun);
 662         sock = socket(AF_LOCAL, SOCK_STREAM, 0);
 663         if (sock < 0)
 664                 return (FALSE);
 665         sun.sun_family = AF_LOCAL;
 666         strncpy(sun.sun_path, _PATH_RPCBINDSOCK, sizeof(sun.sun_path));
 667
 668         if (connect(sock, (struct sockaddr *)&sun, sizeof(sun)) < 0) {
 669                 close(sock);
 670                 return (FALSE);
 671         }
 672
 673         close(sock);
 674         return (TRUE);
 675 }
 676 #endif
 677
 678 /*
 679  * An internal function which optimizes rpcb_getaddr function.  It also
 680  * returns the client handle that it uses to contact the remote rpcbind.
 681  *
 682  * The algorithm used: If the transports is TCP or UDP, it first tries
 683  * version 2 (portmap), 4 and then 3 (svr4).  This order should be
 684  * changed in the next OS release to 4, 2 and 3.  We are assuming that by
 685  * that time, version 4 would be available on many machines on the network.
 686  * With this algorithm, we get performance as well as a plan for
 687  * obsoleting version 2.
 688  *
 689  * For all other transports, the algorithm remains as 4 and then 3.
 690  *
 691  * XXX: Due to some problems with t_connect(), we do not reuse the same client
 692  * handle for COTS cases and hence in these cases we do not return the
 693  * client handle.  This code will change if t_connect() ever
 694  * starts working properly.  Also look under clnt_vc.c.
 695  */
 696 struct netbuf *
 697 __rpcb_findaddr_timed(program, version, nconf, host, clpp, tp)
 698         rpcprog_t program;
 699         rpcvers_t version;
 700         const struct netconfig *nconf;
 701         const char *host;
 702         CLIENT **clpp;
 703         struct timeval *tp;
 704 {
 705 #ifdef NOTUSED
 706         static bool_t check_rpcbind = TRUE;
 707 #endif
 708         CLIENT *client = NULL;
 709         RPCB parms;
 710         enum clnt_stat clnt_st;
 711         char *ua = NULL;
 712         rpcvers_t vers;
 713         struct netbuf *address = NULL;
 714         rpcvers_t start_vers = RPCBVERS4;
 715         struct netbuf servaddr;
 716
 717         /* parameter checking */
 718         if (nconf == NULL) {
 719                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 720                 return (NULL);
 721         }
 722
 723         parms.r_addr = NULL;
 724
 725         /*
 726          * Use default total timeout if no timeout is specified.
 727          */
 728         if (tp == NULL)
 729                 tp = &tottimeout;
 730
 731 #ifdef PORTMAP
 732         /* Try version 2 for TCP or UDP */
 733         if (strcmp(nconf->nc_protofmly, NC_INET) == 0) {
 734                 u_short port = 0;
 735                 struct netbuf remote;
 736                 rpcvers_t pmapvers = 2;
 737                 struct pmap pmapparms;
 738
 739                 /*
 740                  * Try UDP only - there are some portmappers out
 741                  * there that use UDP only.
 742                  */
 743                 if (strcmp(nconf->nc_proto, NC_TCP) == 0) {
 744                         struct netconfig *newnconf;
 745
 746                         if ((newnconf = getnetconfigent("udp")) == NULL) {
 747                                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 748                                 return (NULL);
 749                         }
 750                         client = getclnthandle(host, newnconf, &parms.r_addr);
 751                         freenetconfigent(newnconf);
 752                 } else if (strcmp(nconf->nc_proto, NC_UDP) == 0)
 753                         client = getclnthandle(host, nconf, &parms.r_addr);
 754                 else
 755                         goto try_rpcbind;
 756                 if (client == NULL)
 757                         return (NULL);
 758
 759                 /*
 760                  * Set version and retry timeout.
 761                  */
 762                 CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *)&rpcbrmttime);
 763                 CLNT_CONTROL(client, CLSET_VERS, (char *)&pmapvers);
 764
 765                 pmapparms.pm_prog = program;
 766                 pmapparms.pm_vers = version;
 767                 pmapparms.pm_prot = strcmp(nconf->nc_proto, NC_TCP) ?
 768                                         IPPROTO_UDP : IPPROTO_TCP;
 769                 pmapparms.pm_port = 0;  /* not needed */
 770                 clnt_st = CLNT_CALL(client, (rpcproc_t)PMAPPROC_GETPORT,
 771                     (xdrproc_t) xdr_pmap, (caddr_t)(void *)&pmapparms,
 772                     (xdrproc_t) xdr_u_short, (caddr_t)(void *)&port,
 773                     *tp);
 774                 if (clnt_st != RPC_SUCCESS) {
 775                         if ((clnt_st == RPC_PROGVERSMISMATCH) ||
 776                                 (clnt_st == RPC_PROGUNAVAIL))
 777                                 goto try_rpcbind;
 778                         rpc_createerr.cf_stat = RPC_PMAPFAILURE;
 779                         clnt_geterr(client, &rpc_createerr.cf_error);
 780                         goto error;
 781                 } else if (port == 0) {
 782                         address = NULL;
 783                         rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
 784                         goto error;
 785                 }
 786                 port = htons(port);
 787                 CLNT_CONTROL(client, CLGET_SVC_ADDR, (char *)&remote);
 788                 if (((address = (struct netbuf *)
 789                         malloc(sizeof (struct netbuf))) == NULL) ||
 790                     ((address->buf = (char *)
 791                         malloc(remote.len)) == NULL)) {
 792                         rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 793                         clnt_geterr(client, &rpc_createerr.cf_error);
 794                         if (address) {
 795                                 free(address);
 796                                 address = NULL;
 797                         }
 798                         goto error;
 799                 }
 800                 memcpy(address->buf, remote.buf, remote.len);
 801                 memcpy(&((char *)address->buf)[sizeof (short)],
 802                                 (char *)(void *)&port, sizeof (short));
 803                 address->len = address->maxlen = remote.len;
 804                 goto done;
 805         }
 806
 807 try_rpcbind:
 808 #endif                          /* PORTMAP */
 809
 810         parms.r_prog = program;
 811         parms.r_vers = version;
 812         parms.r_netid = nconf->nc_netid;
 813
 814         /*
 815          * rpcbind ignores the r_owner field in GETADDR requests, but we
 816          * need to give xdr_rpcb something to gnaw on. Might as well make
 817          * it something human readable for when we see these in captures.
 818          */
 819         parms.r_owner = RPCB_OWNER_STRING;
 820
 821         /* Now the same transport is to be used to get the address */
 822         if (client && ((nconf->nc_semantics == NC_TPI_COTS_ORD) ||
 823                         (nconf->nc_semantics == NC_TPI_COTS))) {
 824                 /* A CLTS type of client - destroy it */
 825                 CLNT_DESTROY(client);
 826                 client = NULL;
 827                 free(parms.r_addr);
 828                 parms.r_addr = NULL;
 829         }
 830
 831         if (client == NULL) {
 832                 client = getclnthandle(host, nconf, &parms.r_addr);
 833                 if (client == NULL) {
 834                         goto error;
 835                 }
 836         }
 837         if (parms.r_addr == NULL) {
 838                 /*LINTED const castaway*/
 839                 parms.r_addr = (char *) &nullstring[0];
 840         }
 841
 842         /* First try from start_vers(4) and then version 3 (RPCBVERS) */
 843
 844         CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *) &rpcbrmttime);
 845         for (vers = start_vers;  vers >= RPCBVERS; vers--) {
 846                 /* Set the version */
 847                 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers);
 848                 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDR,
 849                     (xdrproc_t) xdr_rpcb, (char *)(void *)&parms,
 850                     (xdrproc_t) xdr_wrapstring, (char *)(void *) &ua, *tp);
 851                 if (clnt_st == RPC_SUCCESS) {
 852                         if ((ua == NULL) || (ua[0] == 0)) {
 853                                 /* address unknown */
 854                                 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
 855                                 goto error;
 856                         }
 857                         address = uaddr2taddr(nconf, ua);
 858                         LIBTIRPC_DEBUG(3, ("__rpcb_findaddr_timed: Remote address is [%s] %s",
 859                                 ua, (address ? "Resolvable" : "Not Resolvable")));
 860
 861                         xdr_free((xdrproc_t)xdr_wrapstring,
 862                             (char *)(void *)&ua);
 863
 864                         if (! address) {
 865                                 /* We don't know about your universal address */
 866                                 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE;
 867                                 goto error;
 868                         }
 869                         CLNT_CONTROL(client, CLGET_SVC_ADDR,
 870                             (char *)(void *)&servaddr);
 871                         __rpc_fixup_addr(address, &servaddr);
 872                         goto done;
 873                 } else if (clnt_st == RPC_PROGVERSMISMATCH) {
 874                         struct rpc_err rpcerr;
 875                         clnt_geterr(client, &rpcerr);
 876                         if (rpcerr.re_vers.low > RPCBVERS4)
 877                                 goto error;  /* a new version, can't handle */
 878                 } else if (clnt_st != RPC_PROGUNAVAIL) {
 879                         /* Cant handle this error */
 880                         rpc_createerr.cf_stat = clnt_st;
 881                         clnt_geterr(client, &rpc_createerr.cf_error);
 882                         goto error;
 883                 }
 884         }
 885
 886         if ((address == NULL) || (address->len == 0)) {
 887           rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
 888           clnt_geterr(client, &rpc_createerr.cf_error);
 889         }
 890
 891 error:
 892         if (client) {
 893                 CLNT_DESTROY(client);
 894                 client = NULL;
 895         }
 896 done:
 897         if (nconf->nc_semantics != NC_TPI_CLTS) {
 898                 /* This client is the connectionless one */
 899                 if (client) {
 900                         CLNT_DESTROY(client);
 901                         client = NULL;
 902                 }
 903         }
 904         if (clpp) {
 905                 *clpp = client;
 906         } else if (client) {
 907                 CLNT_DESTROY(client);
 908         }
 909         if (parms.r_addr != NULL && parms.r_addr != nullstring)
 910                 free(parms.r_addr);
 911         return (address);
 912 }
 913
 914
 915 /*
 916  * Find the mapped address for program, version.
 917  * Calls the rpcbind service remotely to do the lookup.
 918  * Uses the transport specified in nconf.
 919  * Returns FALSE (0) if no map exists, else returns 1.
 920  *
 921  * Assuming that the address is all properly allocated
 922  */
 923 int
 924 rpcb_getaddr(program, version, nconf, address, host)
 925         rpcprog_t program;
 926         rpcvers_t version;
 927         const struct netconfig *nconf;
 928         struct netbuf *address;
 929         const char *host;
 930 {
 931         struct netbuf *na;
 932
 933         if ((na = __rpcb_findaddr_timed(program, version,
 934             (struct netconfig *) nconf, (char *) host,
 935             (CLIENT **) NULL, (struct timeval *) NULL)) == NULL)
 936                 return (FALSE);
 937
 938         if (na->len > address->maxlen) {
 939                 /* Too long address */
 940                 free(na->buf);
 941                 free(na);
 942                 rpc_createerr.cf_stat = RPC_FAILED;
 943                 return (FALSE);
 944         }
 945         memcpy(address->buf, na->buf, (size_t)na->len);
 946         address->len = na->len;
 947         free(na->buf);
 948         free(na);
 949         return (TRUE);
 950 }
 951
 952 /*
 953  * Get a copy of the current maps.
 954  * Calls the rpcbind service remotely to get the maps.
 955  *
 956  * It returns only a list of the services
 957  * It returns NULL on failure.
 958  */
 959 rpcblist *
 960 rpcb_getmaps(nconf, host)
 961         const struct netconfig *nconf;
 962         const char *host;
 963 {
 964         rpcblist_ptr head = NULL;
 965         CLIENT *client;
 966         enum clnt_stat clnt_st;
 967         rpcvers_t vers = 0;
 968
 969         client = getclnthandle(host, nconf, NULL);
 970         if (client == NULL) {
 971                 return (head);
 972         }
 973         clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP,
 974             (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr,
 975             (char *)(void *)&head, tottimeout);
 976         if (clnt_st == RPC_SUCCESS)
 977                 goto done;
 978
 979         if ((clnt_st != RPC_PROGVERSMISMATCH) &&
 980             (clnt_st != RPC_PROGUNAVAIL)) {
 981                 rpc_createerr.cf_stat = RPC_RPCBFAILURE;
 982                 clnt_geterr(client, &rpc_createerr.cf_error);
 983                 goto done;
 984         }
 985
 986         /* fall back to earlier version */
 987         CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers);
 988         if (vers == RPCBVERS4) {
 989                 vers = RPCBVERS;
 990                 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers);
 991                 if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP,
 992                     (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr,
 993                     (char *)(void *)&head, tottimeout) == RPC_SUCCESS)
 994                         goto done;
 995         }
 996         rpc_createerr.cf_stat = RPC_RPCBFAILURE;
 997         clnt_geterr(client, &rpc_createerr.cf_error);
 998
 999 done:
1000         CLNT_DESTROY(client);
1001         return (head);
1002 }
1003
1004 /*
1005  * rpcbinder remote-call-service interface.
1006  * This routine is used to call the rpcbind remote call service
1007  * which will look up a service program in the address maps, and then
1008  * remotely call that routine with the given parameters. This allows
1009  * programs to do a lookup and call in one step.
1010 */
1011 enum clnt_stat
1012 rpcb_rmtcall(nconf, host, prog, vers, proc, xdrargs, argsp,
1013                 xdrres, resp, tout, addr_ptr)
1014         const struct netconfig *nconf;  /* Netconfig structure */
1015         const char *host;                       /* Remote host name */
1016         rpcprog_t prog;
1017         rpcvers_t vers;
1018         rpcproc_t proc;                 /* Remote proc identifiers */
1019         xdrproc_t xdrargs, xdrres;      /* XDR routines */
1020         caddr_t argsp, resp;            /* Argument and Result */
1021         struct timeval tout;            /* Timeout value for this call */
1022         const struct netbuf *addr_ptr;  /* Preallocated netbuf address */
1023 {
1024         CLIENT *client;
1025         enum clnt_stat stat;
1026         struct r_rpcb_rmtcallargs a;
1027         struct r_rpcb_rmtcallres r;
1028         rpcvers_t rpcb_vers;
1029
1030         stat = 0;
1031         client = getclnthandle(host, nconf, NULL);
1032         if (client == NULL) {
1033                 return (RPC_FAILED);
1034         }
1035         /*LINTED const castaway*/
1036         CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *)(void *)&rmttimeout);
1037         a.prog = prog;
1038         a.vers = vers;
1039         a.proc = proc;
1040         a.args.args_val = argsp;
1041         a.xdr_args = xdrargs;
1042         r.addr = NULL;
1043         r.results.results_val = resp;
1044         r.xdr_res = xdrres;
1045
1046         for (rpcb_vers = RPCBVERS4; rpcb_vers >= RPCBVERS; rpcb_vers--) {
1047                 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&rpcb_vers);
1048                 stat = CLNT_CALL(client, (rpcproc_t)RPCBPROC_CALLIT,
1049                     (xdrproc_t) xdr_rpcb_rmtcallargs, (char *)(void *)&a,
1050                     (xdrproc_t) xdr_rpcb_rmtcallres, (char *)(void *)&r, tout);
1051                 if ((stat == RPC_SUCCESS) && (addr_ptr != NULL)) {
1052                         struct netbuf *na;
1053                         /*LINTED const castaway*/
1054                         na = uaddr2taddr((struct netconfig *) nconf, r.addr);
1055                         if (!na) {
1056                                 stat = RPC_N2AXLATEFAILURE;
1057                                 /*LINTED const castaway*/
1058                                 ((struct netbuf *) addr_ptr)->len = 0;
1059                                 goto error;
1060                         }
1061                         if (na->len > addr_ptr->maxlen) {
1062                                 /* Too long address */
1063                                 stat = RPC_FAILED; /* XXX A better error no */
1064                                 free(na->buf);
1065                                 free(na);
1066                                 /*LINTED const castaway*/
1067                                 ((struct netbuf *) addr_ptr)->len = 0;
1068                                 goto error;
1069                         }
1070                         memcpy(addr_ptr->buf, na->buf, (size_t)na->len);
1071                         /*LINTED const castaway*/
1072                         ((struct netbuf *)addr_ptr)->len = na->len;
1073                         free(na->buf);
1074                         free(na);
1075                         break;
1076                 } else if ((stat != RPC_PROGVERSMISMATCH) &&
1077                             (stat != RPC_PROGUNAVAIL)) {
1078                         goto error;
1079                 }
1080         }
1081 error:
1082         CLNT_DESTROY(client);
1083         if (r.addr)
1084                 xdr_free((xdrproc_t) xdr_wrapstring, (char *)(void *)&r.addr);
1085         return (stat);
1086 }
1087
1088 /*
1089  * Gets the time on the remote host.
1090  * Returns 1 if succeeds else 0.
1091  */
1092 bool_t
1093 rpcb_gettime(host, timep)
1094         const char *host;
1095         time_t *timep;
1096 {
1097         CLIENT *client = NULL;
1098         void *handle;
1099         struct netconfig *nconf;
1100         rpcvers_t vers;
1101         enum clnt_stat st;
1102
1103         if ((host == NULL) || (host[0] == 0)) {
1104                 time(timep);
1105                 return (TRUE);
1106         }
1107
1108         if ((handle = __rpc_setconf("netpath")) == NULL) {
1109                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
1110                 return (FALSE);
1111         }
1112         rpc_createerr.cf_stat = RPC_SUCCESS;
1113         while (client == NULL) {
1114                 if ((nconf = __rpc_getconf(handle)) == NULL) {
1115                         if (rpc_createerr.cf_stat == RPC_SUCCESS)
1116                                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
1117                         break;
1118                 }
1119                 client = getclnthandle(host, nconf, NULL);
1120                 if (client)
1121                         break;
1122         }
1123         __rpc_endconf(handle);
1124         if (client == (CLIENT *) NULL) {
1125                 return (FALSE);
1126         }
1127
1128         st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME,
1129                 (xdrproc_t) xdr_void, NULL,
1130                 (xdrproc_t) xdr_int, (char *)(void *)timep, tottimeout);
1131
1132         if ((st == RPC_PROGVERSMISMATCH) || (st == RPC_PROGUNAVAIL)) {
1133                 CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers);
1134                 if (vers == RPCBVERS4) {
1135                         /* fall back to earlier version */
1136                         vers = RPCBVERS;
1137                         CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers);
1138                         st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME,
1139                                 (xdrproc_t) xdr_void, NULL,
1140                                 (xdrproc_t) xdr_int, (char *)(void *)timep,
1141                                 tottimeout);
1142                 }
1143         }
1144         CLNT_DESTROY(client);
1145         return (st == RPC_SUCCESS? TRUE: FALSE);
1146 }
1147
1148 /*
1149  * Converts taddr to universal address.  This routine should never
1150  * really be called because local n2a libraries are always provided.
1151  */
1152 char *
1153 rpcb_taddr2uaddr(nconf, taddr)
1154         struct netconfig *nconf;
1155         struct netbuf *taddr;
1156 {
1157         CLIENT *client;
1158         char *uaddr = NULL;
1159
1160
1161         /* parameter checking */
1162         if (nconf == NULL) {
1163                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
1164                 return (NULL);
1165         }
1166         if (taddr == NULL) {
1167                 rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
1168                 return (NULL);
1169         }
1170         client = local_rpcb();
1171         if (! client) {
1172                 return (NULL);
1173         }
1174
1175         CLNT_CALL(client, (rpcproc_t)RPCBPROC_TADDR2UADDR,
1176             (xdrproc_t) xdr_netbuf, (char *)(void *)taddr,
1177             (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr, tottimeout);
1178         CLNT_DESTROY(client);
1179         return (uaddr);
1180 }
1181
1182 /*
1183  * Converts universal address to netbuf.  This routine should never
1184  * really be called because local n2a libraries are always provided.
1185  */
1186 struct netbuf *
1187 rpcb_uaddr2taddr(nconf, uaddr)
1188         struct netconfig *nconf;
1189         char *uaddr;
1190 {
1191         CLIENT *client;
1192         struct netbuf *taddr;
1193
1194
1195         /* parameter checking */
1196         if (nconf == NULL) {
1197                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
1198                 return (NULL);
1199         }
1200         if (uaddr == NULL) {
1201                 rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
1202                 return (NULL);
1203         }
1204         client = local_rpcb();
1205         if (! client) {
1206                 return (NULL);
1207         }
1208
1209         taddr = (struct netbuf *)calloc(1, sizeof (struct netbuf));
1210         if (taddr == NULL) {
1211                 CLNT_DESTROY(client);
1212                 return (NULL);
1213         }
1214         if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_UADDR2TADDR,
1215             (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr,
1216             (xdrproc_t) xdr_netbuf, (char *)(void *)taddr,
1217             tottimeout) != RPC_SUCCESS) {
1218                 free(taddr);
1219                 taddr = NULL;
1220         }
1221         CLNT_DESTROY(client);
1222         return (taddr);
1223 }