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 <stdint.h>
  46 #include <rpc/pmap_clnt.h>
  47 #include <net/if.h>
  48 #include <ifaddrs.h>
  49 #include <wchar.h>
  50 #include <fcntl.h>
  51
  52 #ifdef IP_RECVERR
  53 #include <errqueue.h>
  54 #include <sys/uio.h>
  55 #endif
  56
  57 #include <kernel-features.h>
  58 #include <inet/net-internal.h>
  59 #include <shlib-compat.h>
  60
  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.  This private struct is
  86  * unfortunately part of the ABI; ypbind contains a copy of it and
  87  * accesses it through CLIENT::cl_private field.
  88  */
  89 struct cu_data
  90   {
  91     int cu_sock;
  92     bool_t cu_closeit;
  93     struct sockaddr_in cu_raddr;
  94     int cu_rlen;
  95     struct timeval cu_wait;
  96     struct timeval cu_total;
  97     struct rpc_err cu_error;
  98     XDR cu_outxdrs;
  99     u_int cu_xdrpos;
 100     u_int cu_sendsz;
 101     char *cu_outbuf;
 102     u_int cu_recvsz;
 103     char cu_inbuf[1];
 104   };
 105
 106 /*
 107  * Create a UDP based client handle.
 108  * If *sockp<0, *sockp is set to a newly created UPD socket.
 109  * If raddr->sin_port is 0 a binder on the remote machine
 110  * is consulted for the correct port number.
 111  * NB: It is the clients responsibility to close *sockp.
 112  * NB: The rpch->cl_auth is initialized to null authentication.
 113  *     Caller may wish to set this something more useful.
 114  *
 115  * wait is the amount of time used between retransmitting a call if
 116  * no response has been heard; retransmission occurs until the actual
 117  * rpc call times out.
 118  *
 119  * sendsz and recvsz are the maximum allowable packet sizes that can be
 120  * sent and received.
 121  */
 122 CLIENT *
 123 __libc_clntudp_bufcreate (struct sockaddr_in *raddr, u_long program,
 124                           u_long version, struct timeval wait, int *sockp,
 125                           u_int sendsz, u_int recvsz, int flags)
 126 {
 127   CLIENT *cl;
 128   struct cu_data *cu = NULL;
 129   struct rpc_msg call_msg;
 130
 131   cl = (CLIENT *) mem_alloc (sizeof (CLIENT));
 132   sendsz = ((sendsz + 3) / 4) * 4;
 133   recvsz = ((recvsz + 3) / 4) * 4;
 134   cu = (struct cu_data *) mem_alloc (sizeof (*cu) + sendsz + recvsz);
 135   if (cl == NULL || cu == NULL)
 136     {
 137       struct rpc_createerr *ce = &get_rpc_createerr ();
 138       (void) __fxprintf (NULL, "%s: %s",
 139                          "clntudp_create", _("out of memory\n"));
 140       ce->cf_stat = RPC_SYSTEMERROR;
 141       ce->cf_error.re_errno = ENOMEM;
 142       goto fooy;
 143     }
 144   cu->cu_outbuf = &cu->cu_inbuf[recvsz];
 145
 146   if (raddr->sin_port == 0)
 147     {
 148       u_short port;
 149       if ((port =
 150            pmap_getport (raddr, program, version, IPPROTO_UDP)) == 0)
 151         {
 152           goto fooy;
 153         }
 154       raddr->sin_port = htons (port);
 155     }
 156   cl->cl_ops = (struct clnt_ops *) &udp_ops;
 157   cl->cl_private = (caddr_t) cu;
 158   cu->cu_raddr = *raddr;
 159   cu->cu_rlen = sizeof (cu->cu_raddr);
 160   cu->cu_wait = wait;
 161   cu->cu_total.tv_sec = -1;
 162   cu->cu_total.tv_usec = -1;
 163   cu->cu_sendsz = sendsz;
 164   cu->cu_recvsz = recvsz;
 165   call_msg.rm_xid = _create_xid ();
 166   call_msg.rm_direction = CALL;
 167   call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
 168   call_msg.rm_call.cb_prog = program;
 169   call_msg.rm_call.cb_vers = version;
 170   xdrmem_create (&(cu->cu_outxdrs), cu->cu_outbuf, sendsz, XDR_ENCODE);
 171   if (!xdr_callhdr (&(cu->cu_outxdrs), &call_msg))
 172     {
 173       goto fooy;
 174     }
 175   cu->cu_xdrpos = XDR_GETPOS (&(cu->cu_outxdrs));
 176   if (*sockp < 0)
 177     {
 178       *sockp = __socket (AF_INET, SOCK_DGRAM|SOCK_NONBLOCK|flags, IPPROTO_UDP);
 179       if (__glibc_unlikely (*sockp < 0))
 180         {
 181           struct rpc_createerr *ce = &get_rpc_createerr ();
 182           ce->cf_stat = RPC_SYSTEMERROR;
 183           ce->cf_error.re_errno = errno;
 184           goto fooy;
 185         }
 186       /* attempt to bind to prov port */
 187       (void) bindresvport (*sockp, (struct sockaddr_in *) 0);
 188 #ifdef IP_RECVERR
 189       {
 190         int on = 1;
 191         __setsockopt (*sockp, SOL_IP, IP_RECVERR, &on, sizeof(on));
 192       }
 193 #endif
 194       cu->cu_closeit = TRUE;
 195     }
 196   else
 197     {
 198       cu->cu_closeit = FALSE;
 199     }
 200   cu->cu_sock = *sockp;
 201   cl->cl_auth = authnone_create ();
 202   return cl;
 203 fooy:
 204   if (cu)
 205     mem_free ((caddr_t) cu, sizeof (*cu) + sendsz + recvsz);
 206   if (cl)
 207     mem_free ((caddr_t) cl, sizeof (CLIENT));
 208   return (CLIENT *) NULL;
 209 }
 210 #ifdef EXPORT_RPC_SYMBOLS
 211 libc_hidden_def (__libc_clntudp_bufcreate)
 212 #else
 213 libc_hidden_nolink_sunrpc (__libc_clntudp_bufcreate, GLIBC_PRIVATE)
 214 #endif
 215
 216 CLIENT *
 217 clntudp_bufcreate (struct sockaddr_in *raddr, u_long program, u_long version,
 218                    struct timeval wait, int *sockp, u_int sendsz,
 219                    u_int recvsz)
 220 {
 221   return __libc_clntudp_bufcreate (raddr, program, version, wait,
 222                                    sockp, sendsz, recvsz, 0);
 223 }
 224 libc_hidden_nolink_sunrpc (clntudp_bufcreate, GLIBC_2_0)
 225
 226 CLIENT *
 227 clntudp_create (struct sockaddr_in *raddr, u_long program, u_long version,
 228                 struct timeval wait, int *sockp)
 229 {
 230   return __libc_clntudp_bufcreate (raddr, program, version, wait,
 231                                    sockp, UDPMSGSIZE, UDPMSGSIZE, 0);
 232 }
 233 #ifdef EXPORT_RPC_SYMBOLS
 234 libc_hidden_def (clntudp_create)
 235 #else
 236 libc_hidden_nolink_sunrpc (clntudp_create, GLIBC_2_0)
 237 #endif
 238
 239 static int
 240 is_network_up (int sock)
 241 {
 242   struct ifaddrs *ifa;
 243
 244   if (getifaddrs (&ifa) != 0)
 245     return 0;
 246
 247   struct ifaddrs *run = ifa;
 248   while (run != NULL)
 249     {
 250       if ((run->ifa_flags & IFF_UP) != 0
 251           && run->ifa_addr != NULL
 252           && run->ifa_addr->sa_family == AF_INET)
 253         break;
 254
 255       run = run->ifa_next;
 256     }
 257
 258   freeifaddrs (ifa);
 259
 260   return run != NULL;
 261 }
 262
 263 static enum clnt_stat
 264 clntudp_call (/* client handle */
 265               CLIENT *cl,
 266               /* procedure number */
 267               u_long proc,
 268               /* xdr routine for args */
 269               xdrproc_t xargs,
 270               /* pointer to args */
 271               caddr_t argsp,
 272               /* xdr routine for results */
 273               xdrproc_t xresults,
 274               /* pointer to results */
 275               caddr_t resultsp,
 276               /* seconds to wait before giving up */
 277               struct timeval utimeout)
 278 {
 279   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 280   XDR *xdrs;
 281   int outlen = 0;
 282   int inlen;
 283   socklen_t fromlen;
 284   struct pollfd fd;
 285   struct sockaddr_in from;
 286   struct rpc_msg reply_msg;
 287   XDR reply_xdrs;
 288   bool_t ok;
 289   int nrefreshes = 2;           /* number of times to refresh cred */
 290   int anyup;                    /* any network interface up */
 291
 292   struct deadline_current_time current_time = __deadline_current_time ();
 293   struct deadline total_deadline; /* Determined once by overall timeout.  */
 294   struct deadline response_deadline; /* Determined anew for each query.  */
 295
 296   /* Choose the timeout value.  For non-sending usage (xargs == NULL),
 297      the total deadline does not matter, only cu->cu_wait is used
 298      below.  */
 299   if (xargs != NULL)
 300     {
 301       struct timeval tv;
 302       if (cu->cu_total.tv_usec == -1)
 303         /* Use supplied timeout.  */
 304         tv = utimeout;
 305       else
 306         /* Use default timeout.  */
 307         tv = cu->cu_total;
 308       if (!__is_timeval_valid_timeout (tv))
 309         return (cu->cu_error.re_status = RPC_TIMEDOUT);
 310       total_deadline = __deadline_from_timeval (current_time, tv);
 311     }
 312
 313   /* Guard against bad timeout specification.  */
 314   if (!__is_timeval_valid_timeout (cu->cu_wait))
 315     return (cu->cu_error.re_status = RPC_TIMEDOUT);
 316
 317 call_again:
 318   xdrs = &(cu->cu_outxdrs);
 319   if (xargs == NULL)
 320     goto get_reply;
 321   xdrs->x_op = XDR_ENCODE;
 322   XDR_SETPOS (xdrs, cu->cu_xdrpos);
 323   /*
 324    * the transaction is the first thing in the out buffer
 325    */
 326   (*(uint32_t *) (cu->cu_outbuf))++;
 327   if ((!XDR_PUTLONG (xdrs, (long *) &proc)) ||
 328       (!AUTH_MARSHALL (cl->cl_auth, xdrs)) ||
 329       (!(*xargs) (xdrs, argsp)))
 330     return (cu->cu_error.re_status = RPC_CANTENCODEARGS);
 331   outlen = (int) XDR_GETPOS (xdrs);
 332
 333 send_again:
 334   if (__sendto (cu->cu_sock, cu->cu_outbuf, outlen, 0,
 335                 (struct sockaddr *) &(cu->cu_raddr), cu->cu_rlen)
 336       != outlen)
 337     {
 338       cu->cu_error.re_errno = errno;
 339       return (cu->cu_error.re_status = RPC_CANTSEND);
 340     }
 341
 342   /* sendto may have blocked, so recompute the current time.  */
 343   current_time = __deadline_current_time ();
 344  get_reply:
 345   response_deadline = __deadline_from_timeval (current_time, cu->cu_wait);
 346
 347   reply_msg.acpted_rply.ar_verf = _null_auth;
 348   reply_msg.acpted_rply.ar_results.where = resultsp;
 349   reply_msg.acpted_rply.ar_results.proc = xresults;
 350   fd.fd = cu->cu_sock;
 351   fd.events = POLLIN;
 352   anyup = 0;
 353
 354   /* Per-response retry loop.  current_time must be up-to-date at the
 355      top of the loop.  */
 356   for (;;)
 357     {
 358       int milliseconds;
 359       if (xargs != NULL)
 360         {
 361           if (__deadline_elapsed (current_time, total_deadline))
 362             /* Overall timeout expired.  */
 363             return (cu->cu_error.re_status = RPC_TIMEDOUT);
 364           milliseconds = __deadline_to_ms
 365             (current_time, __deadline_first (total_deadline,
 366                                              response_deadline));
 367           if (milliseconds == 0)
 368             /* Per-query timeout expired.  */
 369             goto send_again;
 370         }
 371       else
 372         {
 373           /* xatgs == NULL.  Collect a response without sending a
 374              query.  In this mode, we need to ignore the total
 375              deadline.  */
 376           milliseconds = __deadline_to_ms (current_time, response_deadline);
 377           if (milliseconds == 0)
 378             /* Cannot send again, so bail out.  */
 379             return (cu->cu_error.re_status = RPC_CANTSEND);
 380         }
 381
 382       switch (__poll (&fd, 1, milliseconds))
 383         {
 384
 385         case 0:
 386           if (anyup == 0)
 387             {
 388               anyup = is_network_up (cu->cu_sock);
 389               if (!anyup)
 390                 return (cu->cu_error.re_status = RPC_CANTRECV);
 391             }
 392           goto next_response;
 393         case -1:
 394           if (errno == EINTR)
 395             goto next_response;
 396           cu->cu_error.re_errno = errno;
 397           return (cu->cu_error.re_status = RPC_CANTRECV);
 398         }
 399 #ifdef IP_RECVERR
 400       if (fd.revents & POLLERR)
 401         {
 402           struct msghdr msg;
 403           struct cmsghdr *cmsg;
 404           struct sock_extended_err *e;
 405           struct sockaddr_in err_addr;
 406           struct iovec iov;
 407           char *cbuf = malloc (outlen + 256);
 408           int ret;
 409
 410           if (cbuf == NULL)
 411             {
 412               cu->cu_error.re_errno = errno;
 413               return (cu->cu_error.re_status = RPC_CANTRECV);
 414             }
 415
 416           iov.iov_base = cbuf + 256;
 417           iov.iov_len = outlen;
 418           msg.msg_name = (void *) &err_addr;
 419           msg.msg_namelen = sizeof (err_addr);
 420           msg.msg_iov = &iov;
 421           msg.msg_iovlen = 1;
 422           msg.msg_flags = 0;
 423           msg.msg_control = cbuf;
 424           msg.msg_controllen = 256;
 425           ret = __recvmsg (cu->cu_sock, &msg, MSG_ERRQUEUE);
 426           if (ret >= 0
 427               && memcmp (cbuf + 256, cu->cu_outbuf, ret) == 0
 428               && (msg.msg_flags & MSG_ERRQUEUE)
 429               && ((msg.msg_namelen == 0
 430                    && ret >= 12)
 431                   || (msg.msg_namelen == sizeof (err_addr)
 432                       && err_addr.sin_family == AF_INET
 433                       && memcmp (&err_addr.sin_addr, &cu->cu_raddr.sin_addr,
 434                                  sizeof (err_addr.sin_addr)) == 0
 435                       && err_addr.sin_port == cu->cu_raddr.sin_port)))
 436             for (cmsg = CMSG_FIRSTHDR (&msg); cmsg;
 437                  cmsg = CMSG_NXTHDR (&msg, cmsg))
 438               if (cmsg->cmsg_level == SOL_IP && cmsg->cmsg_type == IP_RECVERR)
 439                 {
 440                   e = (struct sock_extended_err *) CMSG_DATA(cmsg);
 441                   cu->cu_error.re_errno = e->ee_errno;
 442                   free (cbuf);
 443                   return (cu->cu_error.re_status = RPC_CANTRECV);
 444                 }
 445           free (cbuf);
 446         }
 447 #endif
 448       do
 449         {
 450           fromlen = sizeof (struct sockaddr);
 451           inlen = __recvfrom (cu->cu_sock, cu->cu_inbuf,
 452                               (int) cu->cu_recvsz, MSG_DONTWAIT,
 453                               (struct sockaddr *) &from, &fromlen);
 454         }
 455       while (inlen < 0 && errno == EINTR);
 456       if (inlen < 0)
 457         {
 458           if (errno == EWOULDBLOCK)
 459             goto next_response;
 460           cu->cu_error.re_errno = errno;
 461           return (cu->cu_error.re_status = RPC_CANTRECV);
 462         }
 463       /* Accept the response if the packet is sufficiently long and
 464          the transaction ID matches the query (if available).  */
 465       if (inlen >= 4
 466           && (xargs == NULL
 467               || memcmp (cu->cu_inbuf, cu->cu_outbuf,
 468                          sizeof (u_int32_t)) == 0))
 469         break;
 470
 471     next_response:
 472       /* Update the current time because poll and recvmsg waited for
 473          an unknown time.  */
 474       current_time = __deadline_current_time ();
 475     }
 476
 477   /*
 478    * now decode and validate the response
 479    */
 480   xdrmem_create (&reply_xdrs, cu->cu_inbuf, (u_int) inlen, XDR_DECODE);
 481   ok = 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) xdr_opaque_auth (xdrs, &(reply_msg.acpted_rply.ar_verf));
 498             }
 499         }                       /* end successful completion */
 500       else
 501         {
 502           /* maybe our credentials need to be refreshed ... */
 503           if (nrefreshes > 0 && AUTH_REFRESH (cl->cl_auth))
 504             {
 505               nrefreshes--;
 506               goto call_again;
 507             }
 508         }                       /* end of unsuccessful completion */
 509     }                           /* end of valid reply message */
 510   else
 511     {
 512       cu->cu_error.re_status = RPC_CANTDECODERES;
 513     }
 514   return cu->cu_error.re_status;
 515 }
 516
 517 static void
 518 clntudp_geterr (CLIENT *cl, struct rpc_err *errp)
 519 {
 520   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 521
 522   *errp = cu->cu_error;
 523 }
 524
 525
 526 static bool_t
 527 clntudp_freeres (CLIENT *cl, xdrproc_t xdr_res, caddr_t res_ptr)
 528 {
 529   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 530   XDR *xdrs = &(cu->cu_outxdrs);
 531
 532   xdrs->x_op = XDR_FREE;
 533   return (*xdr_res) (xdrs, res_ptr);
 534 }
 535
 536 static void
 537 clntudp_abort (void)
 538 {
 539 }
 540
 541 static bool_t
 542 clntudp_control (CLIENT *cl, int request, char *info)
 543 {
 544   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 545   u_long ul;
 546   u_int32_t ui32;
 547
 548   switch (request)
 549     {
 550     case CLSET_FD_CLOSE:
 551       cu->cu_closeit = TRUE;
 552       break;
 553     case CLSET_FD_NCLOSE:
 554       cu->cu_closeit = FALSE;
 555       break;
 556     case CLSET_TIMEOUT:
 557       cu->cu_total = *(struct timeval *) info;
 558       break;
 559     case CLGET_TIMEOUT:
 560       *(struct timeval *) info = cu->cu_total;
 561       break;
 562     case CLSET_RETRY_TIMEOUT:
 563       cu->cu_wait = *(struct timeval *) info;
 564       break;
 565     case CLGET_RETRY_TIMEOUT:
 566       *(struct timeval *) info = cu->cu_wait;
 567       break;
 568     case CLGET_SERVER_ADDR:
 569       *(struct sockaddr_in *) info = cu->cu_raddr;
 570       break;
 571     case CLGET_FD:
 572       *(int *)info = cu->cu_sock;
 573       break;
 574     case CLGET_XID:
 575       /*
 576        * use the knowledge that xid is the
 577        * first element in the call structure *.
 578        * This will get the xid of the PREVIOUS call
 579        */
 580       memcpy (&ui32, cu->cu_outbuf, sizeof (ui32));
 581       ul = ntohl (ui32);
 582       memcpy (info, &ul, sizeof (ul));
 583       break;
 584     case CLSET_XID:
 585       /* This will set the xid of the NEXT call */
 586       memcpy (&ul, info, sizeof (ul));
 587       ui32 = htonl (ul - 1);
 588       memcpy (cu->cu_outbuf, &ui32, sizeof (ui32));
 589       /* decrement by 1 as clntudp_call() increments once */
 590       break;
 591     case CLGET_VERS:
 592       /*
 593        * This RELIES on the information that, in the call body,
 594        * the version number field is the fifth field from the
 595        * beginning of the RPC header. MUST be changed if the
 596        * call_struct is changed
 597        */
 598       memcpy (&ui32, cu->cu_outbuf + 4 * BYTES_PER_XDR_UNIT, sizeof (ui32));
 599       ul = ntohl (ui32);
 600       memcpy (info, &ul, sizeof (ul));
 601       break;
 602     case CLSET_VERS:
 603       memcpy (&ul, info, sizeof (ul));
 604       ui32 = htonl (ul);
 605       memcpy (cu->cu_outbuf + 4 * BYTES_PER_XDR_UNIT, &ui32, sizeof (ui32));
 606       break;
 607     case CLGET_PROG:
 608       /*
 609        * This RELIES on the information that, in the call body,
 610        * the program number field is the  field from the
 611        * beginning of the RPC header. MUST be changed if the
 612        * call_struct is changed
 613        */
 614       memcpy (&ui32, cu->cu_outbuf + 3 * BYTES_PER_XDR_UNIT, sizeof (ui32));
 615       ul = ntohl (ui32);
 616       memcpy (info, &ul, sizeof (ul));
 617       break;
 618     case CLSET_PROG:
 619       memcpy (&ul, info, sizeof (ul));
 620       ui32 = htonl (ul);
 621       memcpy (cu->cu_outbuf + 3 * BYTES_PER_XDR_UNIT, &ui32, sizeof (ui32));
 622       break;
 623     /* The following are only possible with TI-RPC */
 624     case CLGET_SVC_ADDR:
 625     case CLSET_SVC_ADDR:
 626     case CLSET_PUSH_TIMOD:
 627     case CLSET_POP_TIMOD:
 628     default:
 629       return FALSE;
 630     }
 631   return TRUE;
 632 }
 633
 634 static void
 635 clntudp_destroy (CLIENT *cl)
 636 {
 637   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 638
 639   if (cu->cu_closeit)
 640     {
 641       (void) __close (cu->cu_sock);
 642     }
 643   XDR_DESTROY (&(cu->cu_outxdrs));
 644   mem_free ((caddr_t) cu, (sizeof (*cu) + cu->cu_sendsz + cu->cu_recvsz));
 645   mem_free ((caddr_t) cl, sizeof (CLIENT));
 646 }