sunrpc/clnt_udp.c

   1 /*
   2  * clnt_udp.c, Implements a UDP/IP based, client side RPC.
   3  *
   4  * Copyright (c) 2010, Oracle America, Inc.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are
   8  * met:
   9  *
  10  *     * Redistributions of source code must retain the above copyright
  11  *       notice, this list of conditions and the following disclaimer.
  12  *     * Redistributions in binary form must reproduce the above
  13  *       copyright notice, this list of conditions and the following
  14  *       disclaimer in the documentation and/or other materials
  15  *       provided with the distribution.
  16  *     * Neither the name of the "Oracle America, Inc." nor the names of its
  17  *       contributors may be used to endorse or promote products derived
  18  *       from this software without specific prior written permission.
  19  *
  20  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  23  *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  24  *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  25  *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  27  *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28  *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  29  *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  30  *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include <stdio.h>
  35 #include <unistd.h>
  36 #include <libintl.h>
  37 #include <rpc/rpc.h>
  38 #include <rpc/xdr.h>
  39 #include <rpc/clnt.h>
  40 #include <sys/poll.h>
  41 #include <sys/socket.h>
  42 #include <sys/ioctl.h>
  43 #include <netdb.h>
  44 #include <errno.h>
  45 #include <rpc/pmap_clnt.h>
  46 #include <net/if.h>
  47 #include <ifaddrs.h>
  48 #ifdef USE_IN_LIBIO
  49 # include <wchar.h>
  50 #endif
  51 #include <fcntl.h>
  52
  53 #ifdef IP_RECVERR
  54 #include <errqueue.h>
  55 #include <sys/uio.h>
  56 #endif
  57
  58 #include <kernel-features.h>
  59
  60 extern bool_t xdr_opaque_auth (XDR *, struct opaque_auth *);
  61 extern u_long _create_xid (void);
  62
  63 /*
  64  * UDP bases client side rpc operations
  65  */
  66 static enum clnt_stat clntudp_call (CLIENT *, u_long, xdrproc_t, caddr_t,
  67                                     xdrproc_t, caddr_t, struct timeval);
  68 static void clntudp_abort (void);
  69 static void clntudp_geterr (CLIENT *, struct rpc_err *);
  70 static bool_t clntudp_freeres (CLIENT *, xdrproc_t, caddr_t);
  71 static bool_t clntudp_control (CLIENT *, int, char *);
  72 static void clntudp_destroy (CLIENT *);
  73
  74 static const struct clnt_ops udp_ops =
  75 {
  76   clntudp_call,
  77   clntudp_abort,
  78   clntudp_geterr,
  79   clntudp_freeres,
  80   clntudp_destroy,
  81   clntudp_control
  82 };
  83
  84 /*
  85  * Private data kept per client handle
  86  */
  87 struct cu_data
  88   {
  89     int cu_sock;
  90     bool_t cu_closeit;
  91     struct sockaddr_in cu_raddr;
  92     int cu_rlen;
  93     struct timeval cu_wait;
  94     struct timeval cu_total;
  95     struct rpc_err cu_error;
  96     XDR cu_outxdrs;
  97     u_int cu_xdrpos;
  98     u_int cu_sendsz;
  99     char *cu_outbuf;
 100     u_int cu_recvsz;
 101     char cu_inbuf[1];
 102   };
 103
 104 /*
 105  * Create a UDP based client handle.
 106  * If *sockp<0, *sockp is set to a newly created UPD socket.
 107  * If raddr->sin_port is 0 a binder on the remote machine
 108  * is consulted for the correct port number.
 109  * NB: It is the clients responsibility to close *sockp.
 110  * NB: The rpch->cl_auth is initialized to null authentication.
 111  *     Caller may wish to set this something more useful.
 112  *
 113  * wait is the amount of time used between retransmitting a call if
 114  * no response has been heard; retransmission occurs until the actual
 115  * rpc call times out.
 116  *
 117  * sendsz and recvsz are the maximum allowable packet sizes that can be
 118  * sent and received.
 119  */
 120 CLIENT *
 121 __libc_clntudp_bufcreate (struct sockaddr_in *raddr, u_long program,
 122                           u_long version, struct timeval wait, int *sockp,
 123                           u_int sendsz, u_int recvsz, int flags)
 124 {
 125   CLIENT *cl;
 126   struct cu_data *cu = NULL;
 127   struct rpc_msg call_msg;
 128
 129   cl = (CLIENT *) mem_alloc (sizeof (CLIENT));
 130   sendsz = ((sendsz + 3) / 4) * 4;
 131   recvsz = ((recvsz + 3) / 4) * 4;
 132   cu = (struct cu_data *) mem_alloc (sizeof (*cu) + sendsz + recvsz);
 133   if (cl == NULL || cu == NULL)
 134     {
 135       struct rpc_createerr *ce = &get_rpc_createerr ();
 136       (void) __fxprintf (NULL, "%s: %s",
 137                          "clntudp_create", _("out of memory\n"));
 138       ce->cf_stat = RPC_SYSTEMERROR;
 139       ce->cf_error.re_errno = ENOMEM;
 140       goto fooy;
 141     }
 142   cu->cu_outbuf = &cu->cu_inbuf[recvsz];
 143
 144   if (raddr->sin_port == 0)
 145     {
 146       u_short port;
 147       if ((port =
 148            pmap_getport (raddr, program, version, IPPROTO_UDP)) == 0)
 149         {
 150           goto fooy;
 151         }
 152       raddr->sin_port = htons (port);
 153     }
 154   cl->cl_ops = (struct clnt_ops *) &udp_ops;
 155   cl->cl_private = (caddr_t) cu;
 156   cu->cu_raddr = *raddr;
 157   cu->cu_rlen = sizeof (cu->cu_raddr);
 158   cu->cu_wait = wait;
 159   cu->cu_total.tv_sec = -1;
 160   cu->cu_total.tv_usec = -1;
 161   cu->cu_sendsz = sendsz;
 162   cu->cu_recvsz = recvsz;
 163   call_msg.rm_xid = _create_xid ();
 164   call_msg.rm_direction = CALL;
 165   call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
 166   call_msg.rm_call.cb_prog = program;
 167   call_msg.rm_call.cb_vers = version;
 168   INTUSE(xdrmem_create) (&(cu->cu_outxdrs), cu->cu_outbuf, sendsz, XDR_ENCODE);
 169   if (!INTUSE(xdr_callhdr) (&(cu->cu_outxdrs), &call_msg))
 170     {
 171       goto fooy;
 172     }
 173   cu->cu_xdrpos = XDR_GETPOS (&(cu->cu_outxdrs));
 174   if (*sockp < 0)
 175     {
 176       int dontblock = 1;
 177
 178 #ifdef SOCK_NONBLOCK
 179 # ifndef __ASSUME_SOCK_CLOEXEC
 180       if (__have_sock_cloexec >= 0)
 181 # endif
 182         {
 183           *sockp = __socket (AF_INET, SOCK_DGRAM|SOCK_NONBLOCK|flags,
 184                              IPPROTO_UDP);
 185 # ifndef __ASSUME_SOCK_CLOEXEC
 186           if (__have_sock_cloexec == 0)
 187             __have_sock_cloexec = *sockp >= 0 || errno != EINVAL ? 1 : -1;
 188 # endif
 189         }
 190 #endif
 191 #ifndef __ASSUME_SOCK_CLOEXEC
 192 # ifdef SOCK_CLOEXEC
 193       if (__have_sock_cloexec < 0)
 194 # endif
 195         {
 196           *sockp = __socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 197 # ifdef SOCK_CLOEXEC
 198           if (flags & SOCK_CLOEXEC)
 199             __fcntl (*sockp, F_SETFD, FD_CLOEXEC);
 200 # endif
 201         }
 202 #endif
 203       if (__builtin_expect (*sockp < 0, 0))
 204         {
 205           struct rpc_createerr *ce = &get_rpc_createerr ();
 206           ce->cf_stat = RPC_SYSTEMERROR;
 207           ce->cf_error.re_errno = errno;
 208           goto fooy;
 209         }
 210       /* attempt to bind to prov port */
 211       (void) bindresvport (*sockp, (struct sockaddr_in *) 0);
 212 #ifndef __ASSUME_SOCK_CLOEXEC
 213 # ifdef SOCK_CLOEXEC
 214       if (__have_sock_cloexec < 0)
 215 # endif
 216         /* the sockets rpc controls are non-blocking */
 217         (void) __ioctl (*sockp, FIONBIO, (char *) &dontblock);
 218 #endif
 219 #ifdef IP_RECVERR
 220       {
 221         int on = 1;
 222         __setsockopt (*sockp, SOL_IP, IP_RECVERR, &on, sizeof(on));
 223       }
 224 #endif
 225       cu->cu_closeit = TRUE;
 226     }
 227   else
 228     {
 229       cu->cu_closeit = FALSE;
 230     }
 231   cu->cu_sock = *sockp;
 232   cl->cl_auth = INTUSE(authnone_create) ();
 233   return cl;
 234 fooy:
 235   if (cu)
 236     mem_free ((caddr_t) cu, sizeof (*cu) + sendsz + recvsz);
 237   if (cl)
 238     mem_free ((caddr_t) cl, sizeof (CLIENT));
 239   return (CLIENT *) NULL;
 240 }
 241 INTDEF (__libc_clntudp_bufcreate)
 242
 243 CLIENT *
 244 clntudp_bufcreate (struct sockaddr_in *raddr, u_long program, u_long version,
 245                    struct timeval wait, int *sockp, u_int sendsz,
 246                    u_int recvsz)
 247 {
 248   return INTUSE(__libc_clntudp_bufcreate) (raddr, program, version, wait,
 249                                            sockp, sendsz, recvsz, 0);
 250 }
 251 INTDEF (clntudp_bufcreate)
 252
 253 CLIENT *
 254 clntudp_create (raddr, program, version, wait, sockp)
 255      struct sockaddr_in *raddr;
 256      u_long program;
 257      u_long version;
 258      struct timeval wait;
 259      int *sockp;
 260 {
 261   return INTUSE(__libc_clntudp_bufcreate) (raddr, program, version, wait,
 262                                            sockp, UDPMSGSIZE, UDPMSGSIZE, 0);
 263 }
 264 INTDEF (clntudp_create)
 265
 266 static int
 267 is_network_up (int sock)
 268 {
 269   struct ifaddrs *ifa;
 270
 271   if (getifaddrs (&ifa) != 0)
 272     return 0;
 273
 274   struct ifaddrs *run = ifa;
 275   while (run != NULL)
 276     {
 277       if ((run->ifa_flags & IFF_UP) != 0
 278           && run->ifa_addr != NULL
 279           && run->ifa_addr->sa_family == AF_INET)
 280         break;
 281
 282       run = run->ifa_next;
 283     }
 284
 285   freeifaddrs (ifa);
 286
 287   return run != NULL;
 288 }
 289
 290 static enum clnt_stat
 291 clntudp_call (cl, proc, xargs, argsp, xresults, resultsp, utimeout)
 292      CLIENT *cl;        /* client handle */
 293      u_long proc;               /* procedure number */
 294      xdrproc_t xargs;           /* xdr routine for args */
 295      caddr_t argsp;             /* pointer to args */
 296      xdrproc_t xresults;        /* xdr routine for results */
 297      caddr_t resultsp;          /* pointer to results */
 298      struct timeval utimeout;   /* seconds to wait before giving up */
 299 {
 300   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 301   XDR *xdrs;
 302   int outlen = 0;
 303   int inlen;
 304   socklen_t fromlen;
 305   struct pollfd fd;
 306   int milliseconds = (cu->cu_wait.tv_sec * 1000) +
 307     (cu->cu_wait.tv_usec / 1000);
 308   struct sockaddr_in from;
 309   struct rpc_msg reply_msg;
 310   XDR reply_xdrs;
 311   struct timeval time_waited;
 312   bool_t ok;
 313   int nrefreshes = 2;           /* number of times to refresh cred */
 314   struct timeval timeout;
 315   int anyup;                    /* any network interface up */
 316
 317   if (cu->cu_total.tv_usec == -1)
 318     {
 319       timeout = utimeout;       /* use supplied timeout */
 320     }
 321   else
 322     {
 323       timeout = cu->cu_total;   /* use default timeout */
 324     }
 325
 326   time_waited.tv_sec = 0;
 327   time_waited.tv_usec = 0;
 328 call_again:
 329   xdrs = &(cu->cu_outxdrs);
 330   if (xargs == NULL)
 331     goto get_reply;
 332   xdrs->x_op = XDR_ENCODE;
 333   XDR_SETPOS (xdrs, cu->cu_xdrpos);
 334   /*
 335    * the transaction is the first thing in the out buffer
 336    */
 337   (*(uint32_t *) (cu->cu_outbuf))++;
 338   if ((!XDR_PUTLONG (xdrs, (long *) &proc)) ||
 339       (!AUTH_MARSHALL (cl->cl_auth, xdrs)) ||
 340       (!(*xargs) (xdrs, argsp)))
 341     return (cu->cu_error.re_status = RPC_CANTENCODEARGS);
 342   outlen = (int) XDR_GETPOS (xdrs);
 343
 344 send_again:
 345   if (__sendto (cu->cu_sock, cu->cu_outbuf, outlen, 0,
 346                 (struct sockaddr *) &(cu->cu_raddr), cu->cu_rlen)
 347       != outlen)
 348     {
 349       cu->cu_error.re_errno = errno;
 350       return (cu->cu_error.re_status = RPC_CANTSEND);
 351     }
 352
 353   /*
 354    * Hack to provide rpc-based message passing
 355    */
 356   if (timeout.tv_sec == 0 && timeout.tv_usec == 0)
 357     {
 358       return (cu->cu_error.re_status = RPC_TIMEDOUT);
 359     }
 360  get_reply:
 361   /*
 362    * sub-optimal code appears here because we have
 363    * some clock time to spare while the packets are in flight.
 364    * (We assume that this is actually only executed once.)
 365    */
 366   reply_msg.acpted_rply.ar_verf = _null_auth;
 367   reply_msg.acpted_rply.ar_results.where = resultsp;
 368   reply_msg.acpted_rply.ar_results.proc = xresults;
 369   fd.fd = cu->cu_sock;
 370   fd.events = POLLIN;
 371   anyup = 0;
 372   for (;;)
 373     {
 374       switch (__poll (&fd, 1, milliseconds))
 375         {
 376
 377         case 0:
 378           if (anyup == 0)
 379             {
 380               anyup = is_network_up (cu->cu_sock);
 381               if (!anyup)
 382                 return (cu->cu_error.re_status = RPC_CANTRECV);
 383             }
 384
 385           time_waited.tv_sec += cu->cu_wait.tv_sec;
 386           time_waited.tv_usec += cu->cu_wait.tv_usec;
 387           while (time_waited.tv_usec >= 1000000)
 388             {
 389               time_waited.tv_sec++;
 390               time_waited.tv_usec -= 1000000;
 391             }
 392           if ((time_waited.tv_sec < timeout.tv_sec) ||
 393               ((time_waited.tv_sec == timeout.tv_sec) &&
 394                (time_waited.tv_usec < timeout.tv_usec)))
 395             goto send_again;
 396           return (cu->cu_error.re_status = RPC_TIMEDOUT);
 397
 398           /*
 399            * buggy in other cases because time_waited is not being
 400            * updated.
 401            */
 402         case -1:
 403           if (errno == EINTR)
 404             continue;
 405           cu->cu_error.re_errno = errno;
 406           return (cu->cu_error.re_status = RPC_CANTRECV);
 407         }
 408 #ifdef IP_RECVERR
 409       if (fd.revents & POLLERR)
 410         {
 411           struct msghdr msg;
 412           struct cmsghdr *cmsg;
 413           struct sock_extended_err *e;
 414           struct sockaddr_in err_addr;
 415           struct iovec iov;
 416           char *cbuf = (char *) alloca (outlen + 256);
 417           int ret;
 418
 419           iov.iov_base = cbuf + 256;
 420           iov.iov_len = outlen;
 421           msg.msg_name = (void *) &err_addr;
 422           msg.msg_namelen = sizeof (err_addr);
 423           msg.msg_iov = &iov;
 424           msg.msg_iovlen = 1;
 425           msg.msg_flags = 0;
 426           msg.msg_control = cbuf;
 427           msg.msg_controllen = 256;
 428           ret = __recvmsg (cu->cu_sock, &msg, MSG_ERRQUEUE);
 429           if (ret >= 0
 430               && memcmp (cbuf + 256, cu->cu_outbuf, ret) == 0
 431               && (msg.msg_flags & MSG_ERRQUEUE)
 432               && ((msg.msg_namelen == 0
 433                    && ret >= 12)
 434                   || (msg.msg_namelen == sizeof (err_addr)
 435                       && err_addr.sin_family == AF_INET
 436                       && memcmp (&err_addr.sin_addr, &cu->cu_raddr.sin_addr,
 437                                  sizeof (err_addr.sin_addr)) == 0
 438                       && err_addr.sin_port == cu->cu_raddr.sin_port)))
 439             for (cmsg = CMSG_FIRSTHDR (&msg); cmsg;
 440                  cmsg = CMSG_NXTHDR (&msg, cmsg))
 441               if (cmsg->cmsg_level == SOL_IP && cmsg->cmsg_type == IP_RECVERR)
 442                 {
 443                   e = (struct sock_extended_err *) CMSG_DATA(cmsg);
 444                   cu->cu_error.re_errno = e->ee_errno;
 445                   return (cu->cu_error.re_status = RPC_CANTRECV);
 446                 }
 447         }
 448 #endif
 449       do
 450         {
 451           fromlen = sizeof (struct sockaddr);
 452           inlen = __recvfrom (cu->cu_sock, cu->cu_inbuf,
 453                               (int) cu->cu_recvsz, MSG_DONTWAIT,
 454                               (struct sockaddr *) &from, &fromlen);
 455         }
 456       while (inlen < 0 && errno == EINTR);
 457       if (inlen < 0)
 458         {
 459           if (errno == EWOULDBLOCK)
 460             continue;
 461           cu->cu_error.re_errno = errno;
 462           return (cu->cu_error.re_status = RPC_CANTRECV);
 463         }
 464       if (inlen < 4)
 465         continue;
 466
 467       /* see if reply transaction id matches sent id.
 468         Don't do this if we only wait for a replay */
 469       if (xargs != NULL
 470           && (*((u_int32_t *) (cu->cu_inbuf))
 471               != *((u_int32_t *) (cu->cu_outbuf))))
 472         continue;
 473       /* we now assume we have the proper reply */
 474       break;
 475     }
 476
 477   /*
 478    * now decode and validate the response
 479    */
 480   INTUSE(xdrmem_create) (&reply_xdrs, cu->cu_inbuf, (u_int) inlen, XDR_DECODE);
 481   ok = INTUSE(xdr_replymsg) (&reply_xdrs, &reply_msg);
 482   /* XDR_DESTROY(&reply_xdrs);  save a few cycles on noop destroy */
 483   if (ok)
 484     {
 485       _seterr_reply (&reply_msg, &(cu->cu_error));
 486       if (cu->cu_error.re_status == RPC_SUCCESS)
 487         {
 488           if (!AUTH_VALIDATE (cl->cl_auth,
 489                               &reply_msg.acpted_rply.ar_verf))
 490             {
 491               cu->cu_error.re_status = RPC_AUTHERROR;
 492               cu->cu_error.re_why = AUTH_INVALIDRESP;
 493             }
 494           if (reply_msg.acpted_rply.ar_verf.oa_base != NULL)
 495             {
 496               xdrs->x_op = XDR_FREE;
 497               (void) INTUSE(xdr_opaque_auth) (xdrs,
 498                                               &(reply_msg.acpted_rply.ar_verf));
 499             }
 500         }                       /* end successful completion */
 501       else
 502         {
 503           /* maybe our credentials need to be refreshed ... */
 504           if (nrefreshes > 0 && AUTH_REFRESH (cl->cl_auth))
 505             {
 506               nrefreshes--;
 507               goto call_again;
 508             }
 509         }                       /* end of unsuccessful completion */
 510     }                           /* end of valid reply message */
 511   else
 512     {
 513       cu->cu_error.re_status = RPC_CANTDECODERES;
 514     }
 515   return cu->cu_error.re_status;
 516 }
 517
 518 static void
 519 clntudp_geterr (CLIENT *cl, struct rpc_err *errp)
 520 {
 521   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 522
 523   *errp = cu->cu_error;
 524 }
 525
 526
 527 static bool_t
 528 clntudp_freeres (CLIENT *cl, xdrproc_t xdr_res, caddr_t res_ptr)
 529 {
 530   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 531   XDR *xdrs = &(cu->cu_outxdrs);
 532
 533   xdrs->x_op = XDR_FREE;
 534   return (*xdr_res) (xdrs, res_ptr);
 535 }
 536
 537 static void
 538 clntudp_abort (void)
 539 {
 540 }
 541
 542 static bool_t
 543 clntudp_control (CLIENT *cl, int request, char *info)
 544 {
 545   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 546
 547   switch (request)
 548     {
 549     case CLSET_FD_CLOSE:
 550       cu->cu_closeit = TRUE;
 551       break;
 552     case CLSET_FD_NCLOSE:
 553       cu->cu_closeit = FALSE;
 554       break;
 555     case CLSET_TIMEOUT:
 556       cu->cu_total = *(struct timeval *) info;
 557       break;
 558     case CLGET_TIMEOUT:
 559       *(struct timeval *) info = cu->cu_total;
 560       break;
 561     case CLSET_RETRY_TIMEOUT:
 562       cu->cu_wait = *(struct timeval *) info;
 563       break;
 564     case CLGET_RETRY_TIMEOUT:
 565       *(struct timeval *) info = cu->cu_wait;
 566       break;
 567     case CLGET_SERVER_ADDR:
 568       *(struct sockaddr_in *) info = cu->cu_raddr;
 569       break;
 570     case CLGET_FD:
 571       *(int *)info = cu->cu_sock;
 572       break;
 573     case CLGET_XID:
 574       /*
 575        * use the knowledge that xid is the
 576        * first element in the call structure *.
 577        * This will get the xid of the PREVIOUS call
 578        */
 579       *(u_long *)info = ntohl(*(u_long *)cu->cu_outbuf);
 580       break;
 581     case CLSET_XID:
 582       /* This will set the xid of the NEXT call */
 583       *(u_long *)cu->cu_outbuf =  htonl(*(u_long *)info - 1);
 584       /* decrement by 1 as clntudp_call() increments once */
 585       break;
 586     case CLGET_VERS:
 587       /*
 588        * This RELIES on the information that, in the call body,
 589        * the version number field is the fifth field from the
 590        * begining of the RPC header. MUST be changed if the
 591        * call_struct is changed
 592        */
 593       *(u_long *)info = ntohl(*(u_long *)(cu->cu_outbuf +
 594                                           4 * BYTES_PER_XDR_UNIT));
 595       break;
 596     case CLSET_VERS:
 597       *(u_long *)(cu->cu_outbuf + 4 * BYTES_PER_XDR_UNIT)
 598         = htonl(*(u_long *)info);
 599       break;
 600     case CLGET_PROG:
 601       /*
 602        * This RELIES on the information that, in the call body,
 603        * the program number field is the  field from the
 604        * begining of the RPC header. MUST be changed if the
 605        * call_struct is changed
 606        */
 607       *(u_long *)info = ntohl(*(u_long *)(cu->cu_outbuf +
 608                                           3 * BYTES_PER_XDR_UNIT));
 609       break;
 610     case CLSET_PROG:
 611       *(u_long *)(cu->cu_outbuf + 3 * BYTES_PER_XDR_UNIT)
 612         = htonl(*(u_long *)info);
 613       break;
 614     /* The following are only possible with TI-RPC */
 615     case CLGET_SVC_ADDR:
 616     case CLSET_SVC_ADDR:
 617     case CLSET_PUSH_TIMOD:
 618     case CLSET_POP_TIMOD:
 619     default:
 620       return FALSE;
 621     }
 622   return TRUE;
 623 }
 624
 625 static void
 626 clntudp_destroy (CLIENT *cl)
 627 {
 628   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 629
 630   if (cu->cu_closeit)
 631     {
 632       (void) __close (cu->cu_sock);
 633     }
 634   XDR_DESTROY (&(cu->cu_outxdrs));
 635   mem_free ((caddr_t) cu, (sizeof (*cu) + cu->cu_sendsz + cu->cu_recvsz));
 636   mem_free ((caddr_t) cl, sizeof (CLIENT));
 637 }