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FreeBSD/Linux Kernel Cross Reference
sys/rpc/rpcb_clnt.c

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    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: stable/8/sys/rpc/rpcb_clnt.c 241060 2012-09-30 00:44:53Z pfg $");
   60 
   61 /*
   62  * rpcb_clnt.c
   63  * interface to rpcbind rpc service.
   64  *
   65  * Copyright (C) 1988, Sun Microsystems, Inc.
   66  */
   67 
   68 #include "opt_inet6.h"
   69 
   70 #include <sys/param.h>
   71 #include <sys/systm.h>
   72 #include <sys/kernel.h>
   73 #include <sys/malloc.h>
   74 #include <sys/proc.h>
   75 #include <sys/socket.h>
   76 #include <sys/socketvar.h>
   77 
   78 #include <rpc/rpc.h>
   79 #include <rpc/rpcb_clnt.h>
   80 #include <rpc/rpcb_prot.h>
   81 
   82 #include <rpc/rpc_com.h>
   83 
   84 static struct timeval tottimeout = { 60, 0 };
   85 static const struct timeval rmttimeout = { 3, 0 };
   86 static const char nullstring[] = "\000";
   87 
   88 static CLIENT *local_rpcb(void);
   89 
   90 #if 0
   91 
   92 static struct timeval rpcbrmttime = { 15, 0 };
   93 
   94 #define CACHESIZE 6
   95 
   96 struct address_cache {
   97         char *ac_host;
   98         char *ac_netid;
   99         char *ac_uaddr;
  100         struct netbuf *ac_taddr;
  101         struct address_cache *ac_next;
  102 };
  103 
  104 static struct address_cache *front;
  105 static int cachesize;
  106 
  107 #define CLCR_GET_RPCB_TIMEOUT   1
  108 #define CLCR_SET_RPCB_TIMEOUT   2
  109 
  110 
  111 extern int __rpc_lowvers;
  112 
  113 static struct address_cache *check_cache(const char *, const char *);
  114 static void delete_cache(struct netbuf *);
  115 static void add_cache(const char *, const char *, struct netbuf *, char *);
  116 static CLIENT *getclnthandle(const char *, const struct netconfig *, char **);
  117 static CLIENT *local_rpcb(void);
  118 static struct netbuf *got_entry(rpcb_entry_list_ptr, const struct netconfig *);
  119 
  120 /*
  121  * This routine adjusts the timeout used for calls to the remote rpcbind.
  122  * Also, this routine can be used to set the use of portmapper version 2
  123  * only when doing rpc_broadcasts
  124  * These are private routines that may not be provided in future releases.
  125  */
  126 bool_t
  127 __rpc_control(request, info)
  128         int     request;
  129         void    *info;
  130 {
  131         switch (request) {
  132         case CLCR_GET_RPCB_TIMEOUT:
  133                 *(struct timeval *)info = tottimeout;
  134                 break;
  135         case CLCR_SET_RPCB_TIMEOUT:
  136                 tottimeout = *(struct timeval *)info;
  137                 break;
  138         case CLCR_SET_LOWVERS:
  139                 __rpc_lowvers = *(int *)info;
  140                 break;
  141         case CLCR_GET_LOWVERS:
  142                 *(int *)info = __rpc_lowvers;
  143                 break;
  144         default:
  145                 return (FALSE);
  146         }
  147         return (TRUE);
  148 }
  149 
  150 /*
  151  *      It might seem that a reader/writer lock would be more reasonable here.
  152  *      However because getclnthandle(), the only user of the cache functions,
  153  *      may do a delete_cache() operation if a check_cache() fails to return an
  154  *      address useful to clnt_tli_create(), we may as well use a mutex.
  155  */
  156 /*
  157  * As it turns out, if the cache lock is *not* a reader/writer lock, we will
  158  * block all clnt_create's if we are trying to connect to a host that's down,
  159  * since the lock will be held all during that time.
  160  */
  161 
  162 /*
  163  * The routines check_cache(), add_cache(), delete_cache() manage the
  164  * cache of rpcbind addresses for (host, netid).
  165  */
  166 
  167 static struct address_cache *
  168 check_cache(host, netid)
  169         const char *host, *netid;
  170 {
  171         struct address_cache *cptr;
  172 
  173         /* READ LOCK HELD ON ENTRY: rpcbaddr_cache_lock */
  174 
  175         for (cptr = front; cptr != NULL; cptr = cptr->ac_next) {
  176                 if (!strcmp(cptr->ac_host, host) &&
  177                     !strcmp(cptr->ac_netid, netid)) {
  178 #ifdef ND_DEBUG
  179                         fprintf(stderr, "Found cache entry for %s: %s\n",
  180                                 host, netid);
  181 #endif
  182                         return (cptr);
  183                 }
  184         }
  185         return ((struct address_cache *) NULL);
  186 }
  187 
  188 static void
  189 delete_cache(addr)
  190         struct netbuf *addr;
  191 {
  192         struct address_cache *cptr, *prevptr = NULL;
  193 
  194         /* WRITE LOCK HELD ON ENTRY: rpcbaddr_cache_lock */
  195         for (cptr = front; cptr != NULL; cptr = cptr->ac_next) {
  196                 if (!memcmp(cptr->ac_taddr->buf, addr->buf, addr->len)) {
  197                         free(cptr->ac_host);
  198                         free(cptr->ac_netid);
  199                         free(cptr->ac_taddr->buf);
  200                         free(cptr->ac_taddr);
  201                         if (cptr->ac_uaddr)
  202                                 free(cptr->ac_uaddr);
  203                         if (prevptr)
  204                                 prevptr->ac_next = cptr->ac_next;
  205                         else
  206                                 front = cptr->ac_next;
  207                         free(cptr);
  208                         cachesize--;
  209                         break;
  210                 }
  211                 prevptr = cptr;
  212         }
  213 }
  214 
  215 static void
  216 add_cache(host, netid, taddr, uaddr)
  217         const char *host, *netid;
  218         char *uaddr;
  219         struct netbuf *taddr;
  220 {
  221         struct address_cache  *ad_cache, *cptr, *prevptr;
  222 
  223         ad_cache = (struct address_cache *)
  224                         malloc(sizeof (struct address_cache));
  225         if (!ad_cache) {
  226                 return;
  227         }
  228         ad_cache->ac_host = strdup(host);
  229         ad_cache->ac_netid = strdup(netid);
  230         ad_cache->ac_uaddr = uaddr ? strdup(uaddr) : NULL;
  231         ad_cache->ac_taddr = (struct netbuf *)malloc(sizeof (struct netbuf));
  232         if (!ad_cache->ac_host || !ad_cache->ac_netid || !ad_cache->ac_taddr ||
  233                 (uaddr && !ad_cache->ac_uaddr)) {
  234                 goto out;
  235         }
  236         ad_cache->ac_taddr->len = ad_cache->ac_taddr->maxlen = taddr->len;
  237         ad_cache->ac_taddr->buf = (char *) malloc(taddr->len);
  238         if (ad_cache->ac_taddr->buf == NULL) {
  239 out:
  240                 if (ad_cache->ac_host)
  241                         free(ad_cache->ac_host);
  242                 if (ad_cache->ac_netid)
  243                         free(ad_cache->ac_netid);
  244                 if (ad_cache->ac_uaddr)
  245                         free(ad_cache->ac_uaddr);
  246                 if (ad_cache->ac_taddr)
  247                         free(ad_cache->ac_taddr);
  248                 free(ad_cache);
  249                 return;
  250         }
  251         memcpy(ad_cache->ac_taddr->buf, taddr->buf, taddr->len);
  252 #ifdef ND_DEBUG
  253         fprintf(stderr, "Added to cache: %s : %s\n", host, netid);
  254 #endif
  255 
  256 /* VARIABLES PROTECTED BY rpcbaddr_cache_lock:  cptr */
  257 
  258         rwlock_wrlock(&rpcbaddr_cache_lock);
  259         if (cachesize < CACHESIZE) {
  260                 ad_cache->ac_next = front;
  261                 front = ad_cache;
  262                 cachesize++;
  263         } else {
  264                 /* Free the last entry */
  265                 cptr = front;
  266                 prevptr = NULL;
  267                 while (cptr->ac_next) {
  268                         prevptr = cptr;
  269                         cptr = cptr->ac_next;
  270                 }
  271 
  272 #ifdef ND_DEBUG
  273                 fprintf(stderr, "Deleted from cache: %s : %s\n",
  274                         cptr->ac_host, cptr->ac_netid);
  275 #endif
  276                 free(cptr->ac_host);
  277                 free(cptr->ac_netid);
  278                 free(cptr->ac_taddr->buf);
  279                 free(cptr->ac_taddr);
  280                 if (cptr->ac_uaddr)
  281                         free(cptr->ac_uaddr);
  282 
  283                 if (prevptr) {
  284                         prevptr->ac_next = NULL;
  285                         ad_cache->ac_next = front;
  286                         front = ad_cache;
  287                 } else {
  288                         front = ad_cache;
  289                         ad_cache->ac_next = NULL;
  290                 }
  291                 free(cptr);
  292         }
  293         rwlock_unlock(&rpcbaddr_cache_lock);
  294 }
  295 
  296 /*
  297  * This routine will return a client handle that is connected to the
  298  * rpcbind. If targaddr is non-NULL, the "universal address" of the
  299  * host will be stored in *targaddr; the caller is responsible for
  300  * freeing this string.
  301  * On error, returns NULL and free's everything.
  302  */
  303 static CLIENT *
  304 getclnthandle(host, nconf, targaddr)
  305         const char *host;
  306         const struct netconfig *nconf;
  307         char **targaddr;
  308 {
  309         CLIENT *client;
  310         struct netbuf *addr, taddr;
  311         struct netbuf addr_to_delete;
  312         struct __rpc_sockinfo si;
  313         struct addrinfo hints, *res, *tres;
  314         struct address_cache *ad_cache;
  315         char *tmpaddr;
  316 
  317 /* VARIABLES PROTECTED BY rpcbaddr_cache_lock:  ad_cache */
  318 
  319         /* Get the address of the rpcbind.  Check cache first */
  320         client = NULL;
  321         addr_to_delete.len = 0;
  322         rwlock_rdlock(&rpcbaddr_cache_lock);
  323         ad_cache = NULL;
  324         if (host != NULL)
  325                 ad_cache = check_cache(host, nconf->nc_netid);
  326         if (ad_cache != NULL) {
  327                 addr = ad_cache->ac_taddr;
  328                 client = clnt_tli_create(RPC_ANYFD, nconf, addr,
  329                     (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0);
  330                 if (client != NULL) {
  331                         if (targaddr)
  332                                 *targaddr = strdup(ad_cache->ac_uaddr);
  333                         rwlock_unlock(&rpcbaddr_cache_lock);
  334                         return (client);
  335                 }
  336                 addr_to_delete.len = addr->len;
  337                 addr_to_delete.buf = (char *)malloc(addr->len);
  338                 if (addr_to_delete.buf == NULL) {
  339                         addr_to_delete.len = 0;
  340                 } else {
  341                         memcpy(addr_to_delete.buf, addr->buf, addr->len);
  342                 }
  343         }
  344         rwlock_unlock(&rpcbaddr_cache_lock);
  345         if (addr_to_delete.len != 0) {
  346                 /*
  347                  * Assume this may be due to cache data being
  348                  *  outdated
  349                  */
  350                 rwlock_wrlock(&rpcbaddr_cache_lock);
  351                 delete_cache(&addr_to_delete);
  352                 rwlock_unlock(&rpcbaddr_cache_lock);
  353                 free(addr_to_delete.buf);
  354         }
  355         if (!__rpc_nconf2sockinfo(nconf, &si)) {
  356                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
  357                 return NULL;
  358         }
  359 
  360         memset(&hints, 0, sizeof hints);
  361         hints.ai_family = si.si_af;
  362         hints.ai_socktype = si.si_socktype;
  363         hints.ai_protocol = si.si_proto;
  364 
  365 #ifdef CLNT_DEBUG
  366         printf("trying netid %s family %d proto %d socktype %d\n",
  367             nconf->nc_netid, si.si_af, si.si_proto, si.si_socktype);
  368 #endif
  369 
  370         if (nconf->nc_protofmly != NULL && strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) {
  371                 client = local_rpcb();
  372                 if (! client) {
  373 #ifdef ND_DEBUG
  374                         clnt_pcreateerror("rpcbind clnt interface");
  375 #endif
  376                         return (NULL);
  377                 } else {
  378                         struct sockaddr_un sun;
  379                         if (targaddr) {
  380                             *targaddr = malloc(sizeof(sun.sun_path));
  381                             if (*targaddr == NULL) {
  382                                 CLNT_DESTROY(client);
  383                                 return (NULL);
  384                             }
  385                             strncpy(*targaddr, _PATH_RPCBINDSOCK,
  386                                 sizeof(sun.sun_path));
  387                         }
  388                         return (client);
  389                 }
  390         } else {
  391                 if (getaddrinfo(host, "sunrpc", &hints, &res) != 0) {
  392                         rpc_createerr.cf_stat = RPC_UNKNOWNHOST;
  393                         return NULL;
  394                 }
  395         }
  396 
  397         for (tres = res; tres != NULL; tres = tres->ai_next) {
  398                 taddr.buf = tres->ai_addr;
  399                 taddr.len = taddr.maxlen = tres->ai_addrlen;
  400 
  401 #ifdef ND_DEBUG
  402                 {
  403                         char *ua;
  404 
  405                         ua = taddr2uaddr(nconf, &taddr);
  406                         fprintf(stderr, "Got it [%s]\n", ua);
  407                         free(ua);
  408                 }
  409 #endif
  410 
  411 #ifdef ND_DEBUG
  412                 {
  413                         int i;
  414 
  415                         fprintf(stderr, "\tnetbuf len = %d, maxlen = %d\n",
  416                                 taddr.len, taddr.maxlen);
  417                         fprintf(stderr, "\tAddress is ");
  418                         for (i = 0; i < taddr.len; i++)
  419                                 fprintf(stderr, "%u.", ((char *)(taddr.buf))[i]);
  420                         fprintf(stderr, "\n");
  421                 }
  422 #endif
  423                 client = clnt_tli_create(RPC_ANYFD, nconf, &taddr,
  424                     (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0);
  425 #ifdef ND_DEBUG
  426                 if (! client) {
  427                         clnt_pcreateerror("rpcbind clnt interface");
  428                 }
  429 #endif
  430 
  431                 if (client) {
  432                         tmpaddr = targaddr ? taddr2uaddr(nconf, &taddr) : NULL;
  433                         add_cache(host, nconf->nc_netid, &taddr, tmpaddr);
  434                         if (targaddr)
  435                                 *targaddr = tmpaddr;
  436                         break;
  437                 }
  438         }
  439         if (res)
  440                 freeaddrinfo(res);
  441         return (client);
  442 }
  443 
  444 #endif
  445 
  446 /* XXX */
  447 #define IN4_LOCALHOST_STRING    "127.0.0.1"
  448 #define IN6_LOCALHOST_STRING    "::1"
  449 
  450 /*
  451  * This routine will return a client handle that is connected to the local
  452  * rpcbind. Returns NULL on error and free's everything.
  453  */
  454 static CLIENT *
  455 local_rpcb()
  456 {
  457         CLIENT *client;
  458         struct socket *so;
  459         size_t tsize;
  460         struct sockaddr_un sun;
  461         int error;
  462 
  463         /*
  464          * Try connecting to the local rpcbind through a local socket
  465          * first. If this doesn't work, try all transports defined in
  466          * the netconfig file.
  467          */
  468         memset(&sun, 0, sizeof sun);
  469         so = NULL;
  470         error = socreate(AF_LOCAL, &so, SOCK_STREAM, 0, curthread->td_ucred,
  471             curthread);
  472         if (error)
  473                 goto try_nconf;
  474         sun.sun_family = AF_LOCAL;
  475         strcpy(sun.sun_path, _PATH_RPCBINDSOCK);
  476         sun.sun_len = SUN_LEN(&sun);
  477 
  478         tsize = __rpc_get_t_size(AF_LOCAL, 0, 0);
  479         client = clnt_vc_create(so, (struct sockaddr *)&sun, (rpcprog_t)RPCBPROG,
  480             (rpcvers_t)RPCBVERS, tsize, tsize, 1);
  481 
  482         if (client != NULL) {
  483                 /* Mark the socket to be closed in destructor */
  484                 (void) CLNT_CONTROL(client, CLSET_FD_CLOSE, NULL);
  485                 return client;
  486         }
  487 
  488         /* Nobody needs this socket anymore; free the descriptor. */
  489         soclose(so);
  490 
  491 try_nconf:
  492 
  493 #if 0
  494         static struct netconfig *loopnconf;
  495         static char *localhostname;
  496 
  497 /* VARIABLES PROTECTED BY loopnconf_lock: loopnconf */
  498         mutex_lock(&loopnconf_lock);
  499         if (loopnconf == NULL) {
  500                 struct netconfig *nconf, *tmpnconf = NULL;
  501                 void *nc_handle;
  502                 int fd;
  503 
  504                 nc_handle = setnetconfig();
  505                 if (nc_handle == NULL) {
  506                         /* fails to open netconfig file */
  507                         syslog (LOG_ERR, "rpc: failed to open " NETCONFIG);
  508                         rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
  509                         mutex_unlock(&loopnconf_lock);
  510                         return (NULL);
  511                 }
  512                 while ((nconf = getnetconfig(nc_handle)) != NULL) {
  513                         if ((
  514 #ifdef INET6
  515                              strcmp(nconf->nc_protofmly, NC_INET6) == 0 ||
  516 #endif
  517                              strcmp(nconf->nc_protofmly, NC_INET) == 0) &&
  518                             (nconf->nc_semantics == NC_TPI_COTS ||
  519                              nconf->nc_semantics == NC_TPI_COTS_ORD)) {
  520                                 fd = __rpc_nconf2fd(nconf);
  521                                 /*
  522                                  * Can't create a socket, assume that
  523                                  * this family isn't configured in the kernel.
  524                                  */
  525                                 if (fd < 0)
  526                                         continue;
  527                                 _close(fd);
  528                                 tmpnconf = nconf;
  529                                 if (!strcmp(nconf->nc_protofmly, NC_INET))
  530                                         localhostname = IN4_LOCALHOST_STRING;
  531                                 else
  532                                         localhostname = IN6_LOCALHOST_STRING;
  533                         }
  534                 }
  535                 if (tmpnconf == NULL) {
  536                         rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
  537                         mutex_unlock(&loopnconf_lock);
  538                         return (NULL);
  539                 }
  540                 loopnconf = getnetconfigent(tmpnconf->nc_netid);
  541                 /* loopnconf is never freed */
  542                 endnetconfig(nc_handle);
  543         }
  544         mutex_unlock(&loopnconf_lock);
  545         client = getclnthandle(localhostname, loopnconf, NULL);
  546         return (client);
  547 #else
  548         return (NULL);
  549 #endif
  550 }
  551 
  552 /*
  553  * Set a mapping between program, version and address.
  554  * Calls the rpcbind service to do the mapping.
  555  */
  556 bool_t
  557 rpcb_set(rpcprog_t program, rpcvers_t version,
  558     const struct netconfig *nconf,      /* Network structure of transport */
  559     const struct netbuf *address)       /* Services netconfig address */
  560 {
  561         CLIENT *client;
  562         bool_t rslt = FALSE;
  563         RPCB parms;
  564 #if 0
  565         char uidbuf[32];
  566 #endif
  567         struct netconfig nconfcopy;
  568         struct netbuf addresscopy;
  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         nconfcopy = *nconf;
  587         addresscopy = *address;
  588         parms.r_addr = taddr2uaddr(&nconfcopy, &addresscopy);
  589         if (!parms.r_addr) {
  590                 CLNT_DESTROY(client);
  591                 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE;
  592                 return (FALSE); /* no universal address */
  593         }
  594         parms.r_prog = program;
  595         parms.r_vers = version;
  596         parms.r_netid = nconf->nc_netid;
  597 #if 0
  598         /*
  599          * Though uid is not being used directly, we still send it for
  600          * completeness.  For non-unix platforms, perhaps some other
  601          * string or an empty string can be sent.
  602          */
  603         (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid());
  604         parms.r_owner = uidbuf;
  605 #else
  606         parms.r_owner = "";
  607 #endif
  608 
  609         CLNT_CALL(client, (rpcproc_t)RPCBPROC_SET, (xdrproc_t) xdr_rpcb,
  610             (char *)(void *)&parms, (xdrproc_t) xdr_bool,
  611             (char *)(void *)&rslt, tottimeout);
  612 
  613         CLNT_DESTROY(client);
  614         free(parms.r_addr, M_RPC);
  615         return (rslt);
  616 }
  617 
  618 /*
  619  * Remove the mapping between program, version and netbuf address.
  620  * Calls the rpcbind service to do the un-mapping.
  621  * If netbuf is NULL, unset for all the transports, otherwise unset
  622  * only for the given transport.
  623  */
  624 bool_t
  625 rpcb_unset(rpcprog_t program, rpcvers_t version, const struct netconfig *nconf)
  626 {
  627         CLIENT *client;
  628         bool_t rslt = FALSE;
  629         RPCB parms;
  630 #if 0
  631         char uidbuf[32];
  632 #endif
  633 
  634         client = local_rpcb();
  635         if (! client) {
  636                 return (FALSE);
  637         }
  638 
  639         parms.r_prog = program;
  640         parms.r_vers = version;
  641         if (nconf)
  642                 parms.r_netid = nconf->nc_netid;
  643         else {
  644                 /*LINTED const castaway*/
  645                 parms.r_netid = (char *)(uintptr_t) &nullstring[0]; /* unsets  all */
  646         }
  647         /*LINTED const castaway*/
  648         parms.r_addr = (char *)(uintptr_t) &nullstring[0];
  649 #if 0
  650         (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid());
  651         parms.r_owner = uidbuf;
  652 #else
  653         parms.r_owner = "";
  654 #endif
  655 
  656         CLNT_CALL(client, (rpcproc_t)RPCBPROC_UNSET, (xdrproc_t) xdr_rpcb,
  657             (char *)(void *)&parms, (xdrproc_t) xdr_bool,
  658             (char *)(void *)&rslt, tottimeout);
  659 
  660         CLNT_DESTROY(client);
  661         return (rslt);
  662 }
  663 
  664 #if 0
  665 
  666 /*
  667  * From the merged list, find the appropriate entry
  668  */
  669 static struct netbuf *
  670 got_entry(relp, nconf)
  671         rpcb_entry_list_ptr relp;
  672         const struct netconfig *nconf;
  673 {
  674         struct netbuf *na = NULL;
  675         rpcb_entry_list_ptr sp;
  676         rpcb_entry *rmap;
  677 
  678         for (sp = relp; sp != NULL; sp = sp->rpcb_entry_next) {
  679                 rmap = &sp->rpcb_entry_map;
  680                 if ((strcmp(nconf->nc_proto, rmap->r_nc_proto) == 0) &&
  681                     (strcmp(nconf->nc_protofmly, rmap->r_nc_protofmly) == 0) &&
  682                     (nconf->nc_semantics == rmap->r_nc_semantics) &&
  683                     (rmap->r_maddr != NULL) && (rmap->r_maddr[0] != 0)) {
  684                         na = uaddr2taddr(nconf, rmap->r_maddr);
  685 #ifdef ND_DEBUG
  686                         fprintf(stderr, "\tRemote address is [%s].\n",
  687                                 rmap->r_maddr);
  688                         if (!na)
  689                                 fprintf(stderr,
  690                                     "\tCouldn't resolve remote address!\n");
  691 #endif
  692                         break;
  693                 }
  694         }
  695         return (na);
  696 }
  697 
  698 /*
  699  * Quick check to see if rpcbind is up.  Tries to connect over
  700  * local transport.
  701  */
  702 static bool_t
  703 __rpcbind_is_up()
  704 {
  705         struct netconfig *nconf;
  706         struct sockaddr_un sun;
  707         void *localhandle;
  708         int sock;
  709 
  710         nconf = NULL;
  711         localhandle = setnetconfig();
  712         while ((nconf = getnetconfig(localhandle)) != NULL) {
  713                 if (nconf->nc_protofmly != NULL &&
  714                     strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0)
  715                          break;
  716         }
  717         if (nconf == NULL)
  718                 return (FALSE);
  719 
  720         endnetconfig(localhandle);
  721 
  722         memset(&sun, 0, sizeof sun);
  723         sock = _socket(AF_LOCAL, SOCK_STREAM, 0);
  724         if (sock < 0)
  725                 return (FALSE);
  726         sun.sun_family = AF_LOCAL;
  727         strncpy(sun.sun_path, _PATH_RPCBINDSOCK, sizeof(sun.sun_path));
  728         sun.sun_len = SUN_LEN(&sun);
  729 
  730         if (_connect(sock, (struct sockaddr *)&sun, sun.sun_len) < 0) {
  731                 _close(sock);
  732                 return (FALSE);
  733         }
  734 
  735         _close(sock);
  736         return (TRUE);
  737 }
  738 
  739 /*
  740  * An internal function which optimizes rpcb_getaddr function.  It also
  741  * returns the client handle that it uses to contact the remote rpcbind.
  742  *
  743  * The algorithm used: If the transports is TCP or UDP, it first tries
  744  * version 2 (portmap), 4 and then 3 (svr4).  This order should be
  745  * changed in the next OS release to 4, 2 and 3.  We are assuming that by
  746  * that time, version 4 would be available on many machines on the network.
  747  * With this algorithm, we get performance as well as a plan for
  748  * obsoleting version 2.
  749  *
  750  * For all other transports, the algorithm remains as 4 and then 3.
  751  *
  752  * XXX: Due to some problems with t_connect(), we do not reuse the same client
  753  * handle for COTS cases and hence in these cases we do not return the
  754  * client handle.  This code will change if t_connect() ever
  755  * starts working properly.  Also look under clnt_vc.c.
  756  */
  757 struct netbuf *
  758 __rpcb_findaddr_timed(program, version, nconf, host, clpp, tp)
  759         rpcprog_t program;
  760         rpcvers_t version;
  761         const struct netconfig *nconf;
  762         const char *host;
  763         CLIENT **clpp;
  764         struct timeval *tp;
  765 {
  766         static bool_t check_rpcbind = TRUE;
  767         CLIENT *client = NULL;
  768         RPCB parms;
  769         enum clnt_stat clnt_st;
  770         char *ua = NULL;
  771         rpcvers_t vers;
  772         struct netbuf *address = NULL;
  773         rpcvers_t start_vers = RPCBVERS4;
  774         struct netbuf servaddr;
  775 
  776         /* parameter checking */
  777         if (nconf == NULL) {
  778                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
  779                 return (NULL);
  780         }
  781 
  782         parms.r_addr = NULL;
  783 
  784         /*
  785          * Use default total timeout if no timeout is specified.
  786          */
  787         if (tp == NULL)
  788                 tp = &tottimeout;
  789 
  790 #ifdef PORTMAP
  791         /* Try version 2 for TCP or UDP */
  792         if (strcmp(nconf->nc_protofmly, NC_INET) == 0) {
  793                 u_short port = 0;
  794                 struct netbuf remote;
  795                 rpcvers_t pmapvers = 2;
  796                 struct pmap pmapparms;
  797 
  798                 /*
  799                  * Try UDP only - there are some portmappers out
  800                  * there that use UDP only.
  801                  */
  802                 if (strcmp(nconf->nc_proto, NC_TCP) == 0) {
  803                         struct netconfig *newnconf;
  804 
  805                         if ((newnconf = getnetconfigent("udp")) == NULL) {
  806                                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
  807                                 return (NULL);
  808                         }
  809                         client = getclnthandle(host, newnconf, &parms.r_addr);
  810                         freenetconfigent(newnconf);
  811                 } else {
  812                         client = getclnthandle(host, nconf, &parms.r_addr);
  813                 }
  814                 if (client == NULL)
  815                         return (NULL);
  816 
  817                 /*
  818                  * Set version and retry timeout.
  819                  */
  820                 CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *)&rpcbrmttime);
  821                 CLNT_CONTROL(client, CLSET_VERS, (char *)&pmapvers);
  822 
  823                 pmapparms.pm_prog = program;
  824                 pmapparms.pm_vers = version;
  825                 pmapparms.pm_prot = strcmp(nconf->nc_proto, NC_TCP) ?
  826                                         IPPROTO_UDP : IPPROTO_TCP;
  827                 pmapparms.pm_port = 0;  /* not needed */
  828                 clnt_st = CLNT_CALL(client, (rpcproc_t)PMAPPROC_GETPORT,
  829                     (xdrproc_t) xdr_pmap, (caddr_t)(void *)&pmapparms,
  830                     (xdrproc_t) xdr_u_short, (caddr_t)(void *)&port,
  831                     *tp);
  832                 if (clnt_st != RPC_SUCCESS) {
  833                         if ((clnt_st == RPC_PROGVERSMISMATCH) ||
  834                                 (clnt_st == RPC_PROGUNAVAIL))
  835                                 goto try_rpcbind; /* Try different versions */
  836                         rpc_createerr.cf_stat = RPC_PMAPFAILURE;
  837                         clnt_geterr(client, &rpc_createerr.cf_error);
  838                         goto error;
  839                 } else if (port == 0) {
  840                         address = NULL;
  841                         rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
  842                         goto error;
  843                 }
  844                 port = htons(port);
  845                 CLNT_CONTROL(client, CLGET_SVC_ADDR, (char *)&remote);
  846                 if (((address = (struct netbuf *)
  847                         malloc(sizeof (struct netbuf))) == NULL) ||
  848                     ((address->buf = (char *)
  849                         malloc(remote.len)) == NULL)) {
  850                         rpc_createerr.cf_stat = RPC_SYSTEMERROR;
  851                         clnt_geterr(client, &rpc_createerr.cf_error);
  852                         if (address) {
  853                                 free(address);
  854                                 address = NULL;
  855                         }
  856                         goto error;
  857                 }
  858                 memcpy(address->buf, remote.buf, remote.len);
  859                 memcpy(&((char *)address->buf)[sizeof (short)],
  860                                 (char *)(void *)&port, sizeof (short));
  861                 address->len = address->maxlen = remote.len;
  862                 goto done;
  863         }
  864 #endif                          /* PORTMAP */
  865 
  866 try_rpcbind:
  867         /*
  868          * Check if rpcbind is up.  This prevents needless delays when
  869          * accessing applications such as the keyserver while booting
  870          * disklessly.
  871          */
  872         if (check_rpcbind && strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) {
  873                 if (!__rpcbind_is_up()) {
  874                         rpc_createerr.cf_stat = RPC_PMAPFAILURE;
  875                         rpc_createerr.cf_error.re_errno = 0;
  876                         goto error;
  877                 }
  878                 check_rpcbind = FALSE;
  879         }
  880 
  881         /*
  882          * Now we try version 4 and then 3.
  883          * We also send the remote system the address we used to
  884          * contact it in case it can help to connect back with us
  885          */
  886         parms.r_prog = program;
  887         parms.r_vers = version;
  888         /*LINTED const castaway*/
  889         parms.r_owner = (char *) &nullstring[0];        /* not needed; */
  890                                                         /* just for xdring */
  891         parms.r_netid = nconf->nc_netid; /* not really needed */
  892 
  893         /*
  894          * If a COTS transport is being used, try getting address via CLTS
  895          * transport.  This works only with version 4.
  896          */
  897         if (nconf->nc_semantics == NC_TPI_COTS_ORD ||
  898                         nconf->nc_semantics == NC_TPI_COTS) {
  899 
  900                 void *handle;
  901                 struct netconfig *nconf_clts;
  902                 rpcb_entry_list_ptr relp = NULL;
  903 
  904                 if (client == NULL) {
  905                         /* This did not go through the above PORTMAP/TCP code */
  906                         if ((handle = __rpc_setconf("datagram_v")) != NULL) {
  907                                 while ((nconf_clts = __rpc_getconf(handle))
  908                                         != NULL) {
  909                                         if (strcmp(nconf_clts->nc_protofmly,
  910                                                 nconf->nc_protofmly) != 0) {
  911                                                 continue;
  912                                         }
  913                                         client = getclnthandle(host, nconf_clts,
  914                                                         &parms.r_addr);
  915                                         break;
  916                                 }
  917                                 __rpc_endconf(handle);
  918                         }
  919                         if (client == NULL)
  920                                 goto regular_rpcbind;   /* Go the regular way */
  921                 } else {
  922                         /* This is a UDP PORTMAP handle.  Change to version 4 */
  923                         vers = RPCBVERS4;
  924                         CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers);
  925                 }
  926                 /*
  927                  * We also send the remote system the address we used to
  928                  * contact it in case it can help it connect back with us
  929                  */
  930                 if (parms.r_addr == NULL) {
  931                         /*LINTED const castaway*/
  932                         parms.r_addr = (char *) &nullstring[0]; /* for XDRing */
  933                 }
  934 
  935                 CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *)&rpcbrmttime);
  936 
  937                 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDRLIST,
  938                     (xdrproc_t) xdr_rpcb, (char *)(void *)&parms,
  939                     (xdrproc_t) xdr_rpcb_entry_list_ptr,
  940                     (char *)(void *)&relp, *tp);
  941                 if (clnt_st == RPC_SUCCESS) {
  942                         if ((address = got_entry(relp, nconf)) != NULL) {
  943                                 xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr,
  944                                     (char *)(void *)&relp);
  945                                 CLNT_CONTROL(client, CLGET_SVC_ADDR,
  946                                         (char *)(void *)&servaddr);
  947                                 __rpc_fixup_addr(address, &servaddr);
  948                                 goto done;
  949                         }
  950                         /* Entry not found for this transport */
  951                         xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr,
  952                             (char *)(void *)&relp);
  953                         /*
  954                          * XXX: should have perhaps returned with error but
  955                          * since the remote machine might not always be able
  956                          * to send the address on all transports, we try the
  957                          * regular way with regular_rpcbind
  958                          */
  959                         goto regular_rpcbind;
  960                 } else if ((clnt_st == RPC_PROGVERSMISMATCH) ||
  961                         (clnt_st == RPC_PROGUNAVAIL)) {
  962                         start_vers = RPCBVERS;  /* Try version 3 now */
  963                         goto regular_rpcbind; /* Try different versions */
  964                 } else {
  965                         rpc_createerr.cf_stat = RPC_PMAPFAILURE;
  966                         clnt_geterr(client, &rpc_createerr.cf_error);
  967                         goto error;
  968                 }
  969         }
  970 
  971 regular_rpcbind:
  972 
  973         /* Now the same transport is to be used to get the address */
  974         if (client && ((nconf->nc_semantics == NC_TPI_COTS_ORD) ||
  975                         (nconf->nc_semantics == NC_TPI_COTS))) {
  976                 /* A CLTS type of client - destroy it */
  977                 CLNT_DESTROY(client);
  978                 client = NULL;
  979         }
  980 
  981         if (client == NULL) {
  982                 client = getclnthandle(host, nconf, &parms.r_addr);
  983                 if (client == NULL) {
  984                         goto error;
  985                 }
  986         }
  987         if (parms.r_addr == NULL) {
  988                 /*LINTED const castaway*/
  989                 parms.r_addr = (char *) &nullstring[0];
  990         }
  991 
  992         /* First try from start_vers and then version 3 (RPCBVERS) */
  993 
  994         CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *) &rpcbrmttime);
  995         for (vers = start_vers;  vers >= RPCBVERS; vers--) {
  996                 /* Set the version */
  997                 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers);
  998                 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDR,
  999                     (xdrproc_t) xdr_rpcb, (char *)(void *)&parms,
 1000                     (xdrproc_t) xdr_wrapstring, (char *)(void *) &ua, *tp);
 1001                 if (clnt_st == RPC_SUCCESS) {
 1002                         if ((ua == NULL) || (ua[0] == 0)) {
 1003                                 /* address unknown */
 1004                                 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
 1005                                 goto error;
 1006                         }
 1007                         address = uaddr2taddr(nconf, ua);
 1008 #ifdef ND_DEBUG
 1009                         fprintf(stderr, "\tRemote address is [%s]\n", ua);
 1010                         if (!address)
 1011                                 fprintf(stderr,
 1012                                         "\tCouldn't resolve remote address!\n");
 1013 #endif
 1014                         xdr_free((xdrproc_t)xdr_wrapstring,
 1015                             (char *)(void *)&ua);
 1016 
 1017                         if (! address) {
 1018                                 /* We don't know about your universal address */
 1019                                 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE;
 1020                                 goto error;
 1021                         }
 1022                         CLNT_CONTROL(client, CLGET_SVC_ADDR,
 1023                             (char *)(void *)&servaddr);
 1024                         __rpc_fixup_addr(address, &servaddr);
 1025                         goto done;
 1026                 } else if (clnt_st == RPC_PROGVERSMISMATCH) {
 1027                         struct rpc_err rpcerr;
 1028 
 1029                         clnt_geterr(client, &rpcerr);
 1030                         if (rpcerr.re_vers.low > RPCBVERS4)
 1031                                 goto error;  /* a new version, can't handle */
 1032                 } else if (clnt_st != RPC_PROGUNAVAIL) {
 1033                         /* Cant handle this error */
 1034                         rpc_createerr.cf_stat = clnt_st;
 1035                         clnt_geterr(client, &rpc_createerr.cf_error);
 1036                         goto error;
 1037                 }
 1038         }
 1039 
 1040 error:
 1041         if (client) {
 1042                 CLNT_DESTROY(client);
 1043                 client = NULL;
 1044         }
 1045 done:
 1046         if (nconf->nc_semantics != NC_TPI_CLTS) {
 1047                 /* This client is the connectionless one */
 1048                 if (client) {
 1049                         CLNT_DESTROY(client);
 1050                         client = NULL;
 1051                 }
 1052         }
 1053         if (clpp) {
 1054                 *clpp = client;
 1055         } else if (client) {
 1056                 CLNT_DESTROY(client);
 1057         }
 1058         if (parms.r_addr != NULL && parms.r_addr != nullstring)
 1059                 free(parms.r_addr);
 1060         return (address);
 1061 }
 1062 
 1063 
 1064 /*
 1065  * Find the mapped address for program, version.
 1066  * Calls the rpcbind service remotely to do the lookup.
 1067  * Uses the transport specified in nconf.
 1068  * Returns FALSE (0) if no map exists, else returns 1.
 1069  *
 1070  * Assuming that the address is all properly allocated
 1071  */
 1072 int
 1073 rpcb_getaddr(program, version, nconf, address, host)
 1074         rpcprog_t program;
 1075         rpcvers_t version;
 1076         const struct netconfig *nconf;
 1077         struct netbuf *address;
 1078         const char *host;
 1079 {
 1080         struct netbuf *na;
 1081 
 1082         if ((na = __rpcb_findaddr_timed(program, version,
 1083             (struct netconfig *) nconf, (char *) host,
 1084             (CLIENT **) NULL, (struct timeval *) NULL)) == NULL)
 1085                 return (FALSE);
 1086 
 1087         if (na->len > address->maxlen) {
 1088                 /* Too long address */
 1089                 free(na->buf);
 1090                 free(na);
 1091                 rpc_createerr.cf_stat = RPC_FAILED;
 1092                 return (FALSE);
 1093         }
 1094         memcpy(address->buf, na->buf, (size_t)na->len);
 1095         address->len = na->len;
 1096         free(na->buf);
 1097         free(na);
 1098         return (TRUE);
 1099 }
 1100 
 1101 /*
 1102  * Get a copy of the current maps.
 1103  * Calls the rpcbind service remotely to get the maps.
 1104  *
 1105  * It returns only a list of the services
 1106  * It returns NULL on failure.
 1107  */
 1108 rpcblist *
 1109 rpcb_getmaps(nconf, host)
 1110         const struct netconfig *nconf;
 1111         const char *host;
 1112 {
 1113         rpcblist_ptr head = NULL;
 1114         CLIENT *client;
 1115         enum clnt_stat clnt_st;
 1116         rpcvers_t vers = 0;
 1117 
 1118         client = getclnthandle(host, nconf, NULL);
 1119         if (client == NULL) {
 1120                 return (head);
 1121         }
 1122         clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP,
 1123             (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr,
 1124             (char *)(void *)&head, tottimeout);
 1125         if (clnt_st == RPC_SUCCESS)
 1126                 goto done;
 1127 
 1128         if ((clnt_st != RPC_PROGVERSMISMATCH) &&
 1129             (clnt_st != RPC_PROGUNAVAIL)) {
 1130                 rpc_createerr.cf_stat = RPC_RPCBFAILURE;
 1131                 clnt_geterr(client, &rpc_createerr.cf_error);
 1132                 goto done;
 1133         }
 1134 
 1135         /* fall back to earlier version */
 1136         CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers);
 1137         if (vers == RPCBVERS4) {
 1138                 vers = RPCBVERS;
 1139                 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers);
 1140                 if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP,
 1141                     (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr,
 1142                     (char *)(void *)&head, tottimeout) == RPC_SUCCESS)
 1143                         goto done;
 1144         }
 1145         rpc_createerr.cf_stat = RPC_RPCBFAILURE;
 1146         clnt_geterr(client, &rpc_createerr.cf_error);
 1147 
 1148 done:
 1149         CLNT_DESTROY(client);
 1150         return (head);
 1151 }
 1152 
 1153 /*
 1154  * rpcbinder remote-call-service interface.
 1155  * This routine is used to call the rpcbind remote call service
 1156  * which will look up a service program in the address maps, and then
 1157  * remotely call that routine with the given parameters. This allows
 1158  * programs to do a lookup and call in one step.
 1159 */
 1160 enum clnt_stat
 1161 rpcb_rmtcall(nconf, host, prog, vers, proc, xdrargs, argsp,
 1162                 xdrres, resp, tout, addr_ptr)
 1163         const struct netconfig *nconf;  /* Netconfig structure */
 1164         const char *host;                       /* Remote host name */
 1165         rpcprog_t prog;
 1166         rpcvers_t vers;
 1167         rpcproc_t proc;                 /* Remote proc identifiers */
 1168         xdrproc_t xdrargs, xdrres;      /* XDR routines */
 1169         caddr_t argsp, resp;            /* Argument and Result */
 1170         struct timeval tout;            /* Timeout value for this call */
 1171         const struct netbuf *addr_ptr;  /* Preallocated netbuf address */
 1172 {
 1173         CLIENT *client;
 1174         enum clnt_stat stat;
 1175         struct r_rpcb_rmtcallargs a;
 1176         struct r_rpcb_rmtcallres r;
 1177         rpcvers_t rpcb_vers;
 1178 
 1179         stat = 0;
 1180         client = getclnthandle(host, nconf, NULL);
 1181         if (client == NULL) {
 1182                 return (RPC_FAILED);
 1183         }
 1184         /*LINTED const castaway*/
 1185         CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *)(void *)&rmttimeout);
 1186         a.prog = prog;
 1187         a.vers = vers;
 1188         a.proc = proc;
 1189         a.args.args_val = argsp;
 1190         a.xdr_args = xdrargs;
 1191         r.addr = NULL;
 1192         r.results.results_val = resp;
 1193         r.xdr_res = xdrres;
 1194 
 1195         for (rpcb_vers = RPCBVERS4; rpcb_vers >= RPCBVERS; rpcb_vers--) {
 1196                 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&rpcb_vers);
 1197                 stat = CLNT_CALL(client, (rpcproc_t)RPCBPROC_CALLIT,
 1198                     (xdrproc_t) xdr_rpcb_rmtcallargs, (char *)(void *)&a,
 1199                     (xdrproc_t) xdr_rpcb_rmtcallres, (char *)(void *)&r, tout);
 1200                 if ((stat == RPC_SUCCESS) && (addr_ptr != NULL)) {
 1201                         struct netbuf *na;
 1202                         /*LINTED const castaway*/
 1203                         na = uaddr2taddr((struct netconfig *) nconf, r.addr);
 1204                         if (!na) {
 1205                                 stat = RPC_N2AXLATEFAILURE;
 1206                                 /*LINTED const castaway*/
 1207                                 ((struct netbuf *) addr_ptr)->len = 0;
 1208                                 goto error;
 1209                         }
 1210                         if (na->len > addr_ptr->maxlen) {
 1211                                 /* Too long address */
 1212                                 stat = RPC_FAILED; /* XXX A better error no */
 1213                                 free(na->buf);
 1214                                 free(na);
 1215                                 /*LINTED const castaway*/
 1216                                 ((struct netbuf *) addr_ptr)->len = 0;
 1217                                 goto error;
 1218                         }
 1219                         memcpy(addr_ptr->buf, na->buf, (size_t)na->len);
 1220                         /*LINTED const castaway*/
 1221                         ((struct netbuf *)addr_ptr)->len = na->len;
 1222                         free(na->buf);
 1223                         free(na);
 1224                         break;
 1225                 } else if ((stat != RPC_PROGVERSMISMATCH) &&
 1226                             (stat != RPC_PROGUNAVAIL)) {
 1227                         goto error;
 1228                 }
 1229         }
 1230 error:
 1231         CLNT_DESTROY(client);
 1232         if (r.addr)
 1233                 xdr_free((xdrproc_t) xdr_wrapstring, (char *)(void *)&r.addr);
 1234         return (stat);
 1235 }
 1236 
 1237 /*
 1238  * Gets the time on the remote host.
 1239  * Returns 1 if succeeds else 0.
 1240  */
 1241 bool_t
 1242 rpcb_gettime(host, timep)
 1243         const char *host;
 1244         time_t *timep;
 1245 {
 1246         CLIENT *client = NULL;
 1247         void *handle;
 1248         struct netconfig *nconf;
 1249         rpcvers_t vers;
 1250         enum clnt_stat st;
 1251 
 1252 
 1253         if ((host == NULL) || (host[0] == 0)) {
 1254                 time(timep);
 1255                 return (TRUE);
 1256         }
 1257 
 1258         if ((handle = __rpc_setconf("netpath")) == NULL) {
 1259                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 1260                 return (FALSE);
 1261         }
 1262         rpc_createerr.cf_stat = RPC_SUCCESS;
 1263         while (client == NULL) {
 1264                 if ((nconf = __rpc_getconf(handle)) == NULL) {
 1265                         if (rpc_createerr.cf_stat == RPC_SUCCESS)
 1266                                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 1267                         break;
 1268                 }
 1269                 client = getclnthandle(host, nconf, NULL);
 1270                 if (client)
 1271                         break;
 1272         }
 1273         __rpc_endconf(handle);
 1274         if (client == (CLIENT *) NULL) {
 1275                 return (FALSE);
 1276         }
 1277 
 1278         st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME,
 1279                 (xdrproc_t) xdr_void, NULL,
 1280                 (xdrproc_t) xdr_int, (char *)(void *)timep, tottimeout);
 1281 
 1282         if ((st == RPC_PROGVERSMISMATCH) || (st == RPC_PROGUNAVAIL)) {
 1283                 CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers);
 1284                 if (vers == RPCBVERS4) {
 1285                         /* fall back to earlier version */
 1286                         vers = RPCBVERS;
 1287                         CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers);
 1288                         st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME,
 1289                                 (xdrproc_t) xdr_void, NULL,
 1290                                 (xdrproc_t) xdr_int, (char *)(void *)timep,
 1291                                 tottimeout);
 1292                 }
 1293         }
 1294         CLNT_DESTROY(client);
 1295         return (st == RPC_SUCCESS? TRUE: FALSE);
 1296 }
 1297 
 1298 static bool_t
 1299 xdr_netbuf(XDR *xdrs, struct netbuf *objp)
 1300 {
 1301         bool_t dummy;
 1302         void **pp;
 1303 
 1304         if (!xdr_uint32_t(xdrs, (uint32_t *) &objp->maxlen)) {
 1305                 return (FALSE);
 1306         }
 1307         pp = &objp->buf;
 1308         dummy = xdr_bytes(xdrs, (char **) pp,
 1309                         (u_int *)&(objp->len), objp->maxlen);
 1310         return (dummy);
 1311 }
 1312 
 1313 /*
 1314  * Converts taddr to universal address.  This routine should never
 1315  * really be called because local n2a libraries are always provided.
 1316  */
 1317 char *
 1318 rpcb_taddr2uaddr(struct netconfig *nconf, struct netbuf *taddr)
 1319 {
 1320         CLIENT *client;
 1321         char *uaddr = NULL;
 1322 
 1323 
 1324         /* parameter checking */
 1325         if (nconf == NULL) {
 1326                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 1327                 return (NULL);
 1328         }
 1329         if (taddr == NULL) {
 1330                 rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
 1331                 return (NULL);
 1332         }
 1333         client = local_rpcb();
 1334         if (! client) {
 1335                 return (NULL);
 1336         }
 1337 
 1338         CLNT_CALL(client, (rpcproc_t)RPCBPROC_TADDR2UADDR,
 1339             (xdrproc_t) xdr_netbuf, (char *)(void *)taddr,
 1340             (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr, tottimeout);
 1341         CLNT_DESTROY(client);
 1342         return (uaddr);
 1343 }
 1344 
 1345 /*
 1346  * Converts universal address to netbuf.  This routine should never
 1347  * really be called because local n2a libraries are always provided.
 1348  */
 1349 struct netbuf *
 1350 rpcb_uaddr2taddr(struct netconfig *nconf, char *uaddr)
 1351 {
 1352         CLIENT *client;
 1353         struct netbuf *taddr;
 1354 
 1355 
 1356         /* parameter checking */
 1357         if (nconf == NULL) {
 1358                 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
 1359                 return (NULL);
 1360         }
 1361         if (uaddr == NULL) {
 1362                 rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
 1363                 return (NULL);
 1364         }
 1365         client = local_rpcb();
 1366         if (! client) {
 1367                 return (NULL);
 1368         }
 1369 
 1370         taddr = (struct netbuf *)malloc(sizeof (struct netbuf), M_RPC, M_WAITOK|M_ZERO);
 1371         if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_UADDR2TADDR,
 1372             (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr,
 1373             (xdrproc_t) xdr_netbuf, (char *)(void *)taddr,
 1374             tottimeout) != RPC_SUCCESS) {
 1375                 free(taddr);
 1376                 taddr = NULL;
 1377         }
 1378         CLNT_DESTROY(client);
 1379         return (taddr);
 1380 }
 1381 
 1382 #endif

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