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 #include <wchar.h>
  49 #include <fcntl.h>
  50
  51 #ifdef IP_RECVERR
  52 #include <errqueue.h>
  53 #include <sys/uio.h>
  54 #endif
  55
  56 #include <kernel-features.h>
  57
  58 extern u_long _create_xid (void);
  59
  60 /*
  61  * UDP bases client side rpc operations
  62  */
  63 static enum clnt_stat clntudp_call (CLIENT *, u_long, xdrproc_t, caddr_t,
  64                                     xdrproc_t, caddr_t, struct timeval);
  65 static void clntudp_abort (void);
  66 static void clntudp_geterr (CLIENT *, struct rpc_err *);
  67 static bool_t clntudp_freeres (CLIENT *, xdrproc_t, caddr_t);
  68 static bool_t clntudp_control (CLIENT *, int, char *);
  69 static void clntudp_destroy (CLIENT *);
  70
  71 static const struct clnt_ops udp_ops =
  72 {
  73   clntudp_call,
  74   clntudp_abort,
  75   clntudp_geterr,
  76   clntudp_freeres,
  77   clntudp_destroy,
  78   clntudp_control
  79 };
  80
  81 /*
  82  * Private data kept per client handle
  83  */
  84 struct cu_data
  85   {
  86     int cu_sock;
  87     bool_t cu_closeit;
  88     struct sockaddr_in cu_raddr;
  89     int cu_rlen;
  90     struct timeval cu_wait;
  91     struct timeval cu_total;
  92     struct rpc_err cu_error;
  93     XDR cu_outxdrs;
  94     u_int cu_xdrpos;
  95     u_int cu_sendsz;
  96     char *cu_outbuf;
  97     u_int cu_recvsz;
  98     char cu_inbuf[1];
  99   };
 100
 101 /*
 102  * Create a UDP based client handle.
 103  * If *sockp<0, *sockp is set to a newly created UPD socket.
 104  * If raddr->sin_port is 0 a binder on the remote machine
 105  * is consulted for the correct port number.
 106  * NB: It is the clients responsibility to close *sockp.
 107  * NB: The rpch->cl_auth is initialized to null authentication.
 108  *     Caller may wish to set this something more useful.
 109  *
 110  * wait is the amount of time used between retransmitting a call if
 111  * no response has been heard; retransmission occurs until the actual
 112  * rpc call times out.
 113  *
 114  * sendsz and recvsz are the maximum allowable packet sizes that can be
 115  * sent and received.
 116  */
 117 CLIENT *
 118 __libc_clntudp_bufcreate (struct sockaddr_in *raddr, u_long program,
 119                           u_long version, struct timeval wait, int *sockp,
 120                           u_int sendsz, u_int recvsz, int flags)
 121 {
 122   CLIENT *cl;
 123   struct cu_data *cu = NULL;
 124   struct rpc_msg call_msg;
 125
 126   cl = (CLIENT *) mem_alloc (sizeof (CLIENT));
 127   sendsz = ((sendsz + 3) / 4) * 4;
 128   recvsz = ((recvsz + 3) / 4) * 4;
 129   cu = (struct cu_data *) mem_alloc (sizeof (*cu) + sendsz + recvsz);
 130   if (cl == NULL || cu == NULL)
 131     {
 132       struct rpc_createerr *ce = &get_rpc_createerr ();
 133       (void) __fxprintf (NULL, "%s: %s",
 134                          "clntudp_create", _("out of memory\n"));
 135       ce->cf_stat = RPC_SYSTEMERROR;
 136       ce->cf_error.re_errno = ENOMEM;
 137       goto fooy;
 138     }
 139   cu->cu_outbuf = &cu->cu_inbuf[recvsz];
 140
 141   if (raddr->sin_port == 0)
 142     {
 143       u_short port;
 144       if ((port =
 145            pmap_getport (raddr, program, version, IPPROTO_UDP)) == 0)
 146         {
 147           goto fooy;
 148         }
 149       raddr->sin_port = htons (port);
 150     }
 151   cl->cl_ops = (struct clnt_ops *) &udp_ops;
 152   cl->cl_private = (caddr_t) cu;
 153   cu->cu_raddr = *raddr;
 154   cu->cu_rlen = sizeof (cu->cu_raddr);
 155   cu->cu_wait = wait;
 156   cu->cu_total.tv_sec = -1;
 157   cu->cu_total.tv_usec = -1;
 158   cu->cu_sendsz = sendsz;
 159   cu->cu_recvsz = recvsz;
 160   call_msg.rm_xid = _create_xid ();
 161   call_msg.rm_direction = CALL;
 162   call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
 163   call_msg.rm_call.cb_prog = program;
 164   call_msg.rm_call.cb_vers = version;
 165   xdrmem_create (&(cu->cu_outxdrs), cu->cu_outbuf, sendsz, XDR_ENCODE);
 166   if (!xdr_callhdr (&(cu->cu_outxdrs), &call_msg))
 167     {
 168       goto fooy;
 169     }
 170   cu->cu_xdrpos = XDR_GETPOS (&(cu->cu_outxdrs));
 171   if (*sockp < 0)
 172     {
 173 #ifdef SOCK_NONBLOCK
 174 # ifndef __ASSUME_SOCK_CLOEXEC
 175       if (__have_sock_cloexec >= 0)
 176 # endif
 177         {
 178           *sockp = __socket (AF_INET, SOCK_DGRAM|SOCK_NONBLOCK|flags,
 179                              IPPROTO_UDP);
 180 # ifndef __ASSUME_SOCK_CLOEXEC
 181           if (__have_sock_cloexec == 0)
 182             __have_sock_cloexec = *sockp >= 0 || errno != EINVAL ? 1 : -1;
 183 # endif
 184         }
 185 #endif
 186 #ifndef __ASSUME_SOCK_CLOEXEC
 187 # ifdef SOCK_CLOEXEC
 188       if (__have_sock_cloexec < 0)
 189 # endif
 190         {
 191           *sockp = __socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 192 # ifdef SOCK_CLOEXEC
 193           if (flags & SOCK_CLOEXEC)
 194             __fcntl (*sockp, F_SETFD, FD_CLOEXEC);
 195 # endif
 196         }
 197 #endif
 198       if (__builtin_expect (*sockp < 0, 0))
 199         {
 200           struct rpc_createerr *ce = &get_rpc_createerr ();
 201           ce->cf_stat = RPC_SYSTEMERROR;
 202           ce->cf_error.re_errno = errno;
 203           goto fooy;
 204         }
 205       /* attempt to bind to prov port */
 206       (void) bindresvport (*sockp, (struct sockaddr_in *) 0);
 207 #ifndef __ASSUME_SOCK_CLOEXEC
 208 # ifdef SOCK_CLOEXEC
 209       if (__have_sock_cloexec < 0)
 210 # endif
 211         {
 212           /* the sockets rpc controls are non-blocking */
 213           int dontblock = 1;
 214           (void) __ioctl (*sockp, FIONBIO, (char *) &dontblock);
 215         }
 216 #endif
 217 #ifdef IP_RECVERR
 218       {
 219         int on = 1;
 220         __setsockopt (*sockp, SOL_IP, IP_RECVERR, &on, sizeof(on));
 221       }
 222 #endif
 223       cu->cu_closeit = TRUE;
 224     }
 225   else
 226     {
 227       cu->cu_closeit = FALSE;
 228     }
 229   cu->cu_sock = *sockp;
 230   cl->cl_auth = authnone_create ();
 231   return cl;
 232 fooy:
 233   if (cu)
 234     mem_free ((caddr_t) cu, sizeof (*cu) + sendsz + recvsz);
 235   if (cl)
 236     mem_free ((caddr_t) cl, sizeof (CLIENT));
 237   return (CLIENT *) NULL;
 238 }
 239 #ifdef EXPORT_RPC_SYMBOLS
 240 libc_hidden_def (__libc_clntudp_bufcreate)
 241 #else
 242 libc_hidden_nolink_sunrpc (__libc_clntudp_bufcreate, GLIBC_PRIVATE)
 243 #endif
 244
 245 CLIENT *
 246 clntudp_bufcreate (struct sockaddr_in *raddr, u_long program, u_long version,
 247                    struct timeval wait, int *sockp, u_int sendsz,
 248                    u_int recvsz)
 249 {
 250   return __libc_clntudp_bufcreate (raddr, program, version, wait,
 251                                    sockp, sendsz, recvsz, 0);
 252 }
 253 libc_hidden_nolink_sunrpc (clntudp_bufcreate, GLIBC_2_0)
 254
 255 CLIENT *
 256 clntudp_create (raddr, program, version, wait, sockp)
 257      struct sockaddr_in *raddr;
 258      u_long program;
 259      u_long version;
 260      struct timeval wait;
 261      int *sockp;
 262 {
 263   return __libc_clntudp_bufcreate (raddr, program, version, wait,
 264                                    sockp, UDPMSGSIZE, UDPMSGSIZE, 0);
 265 }
 266 #ifdef EXPORT_RPC_SYMBOLS
 267 libc_hidden_def (clntudp_create)
 268 #else
 269 libc_hidden_nolink_sunrpc (clntudp_create, GLIBC_2_0)
 270 #endif
 271
 272 static int
 273 is_network_up (int sock)
 274 {
 275   struct ifaddrs *ifa;
 276
 277   if (getifaddrs (&ifa) != 0)
 278     return 0;
 279
 280   struct ifaddrs *run = ifa;
 281   while (run != NULL)
 282     {
 283       if ((run->ifa_flags & IFF_UP) != 0
 284           && run->ifa_addr != NULL
 285           && run->ifa_addr->sa_family == AF_INET)
 286         break;
 287
 288       run = run->ifa_next;
 289     }
 290
 291   freeifaddrs (ifa);
 292
 293   return run != NULL;
 294 }
 295
 296 static enum clnt_stat
 297 clntudp_call (cl, proc, xargs, argsp, xresults, resultsp, utimeout)
 298      CLIENT *cl;        /* client handle */
 299      u_long proc;               /* procedure number */
 300      xdrproc_t xargs;           /* xdr routine for args */
 301      caddr_t argsp;             /* pointer to args */
 302      xdrproc_t xresults;        /* xdr routine for results */
 303      caddr_t resultsp;          /* pointer to results */
 304      struct timeval utimeout;   /* seconds to wait before giving up */
 305 {
 306   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 307   XDR *xdrs;
 308   int outlen = 0;
 309   int inlen;
 310   socklen_t fromlen;
 311   struct pollfd fd;
 312   int milliseconds = (cu->cu_wait.tv_sec * 1000) +
 313     (cu->cu_wait.tv_usec / 1000);
 314   struct sockaddr_in from;
 315   struct rpc_msg reply_msg;
 316   XDR reply_xdrs;
 317   struct timeval time_waited;
 318   bool_t ok;
 319   int nrefreshes = 2;           /* number of times to refresh cred */
 320   struct timeval timeout;
 321   int anyup;                    /* any network interface up */
 322
 323   if (cu->cu_total.tv_usec == -1)
 324     {
 325       timeout = utimeout;       /* use supplied timeout */
 326     }
 327   else
 328     {
 329       timeout = cu->cu_total;   /* use default timeout */
 330     }
 331
 332   time_waited.tv_sec = 0;
 333   time_waited.tv_usec = 0;
 334 call_again:
 335   xdrs = &(cu->cu_outxdrs);
 336   if (xargs == NULL)
 337     goto get_reply;
 338   xdrs->x_op = XDR_ENCODE;
 339   XDR_SETPOS (xdrs, cu->cu_xdrpos);
 340   /*
 341    * the transaction is the first thing in the out buffer
 342    */
 343   (*(uint32_t *) (cu->cu_outbuf))++;
 344   if ((!XDR_PUTLONG (xdrs, (long *) &proc)) ||
 345       (!AUTH_MARSHALL (cl->cl_auth, xdrs)) ||
 346       (!(*xargs) (xdrs, argsp)))
 347     return (cu->cu_error.re_status = RPC_CANTENCODEARGS);
 348   outlen = (int) XDR_GETPOS (xdrs);
 349
 350 send_again:
 351   if (__sendto (cu->cu_sock, cu->cu_outbuf, outlen, 0,
 352                 (struct sockaddr *) &(cu->cu_raddr), cu->cu_rlen)
 353       != outlen)
 354     {
 355       cu->cu_error.re_errno = errno;
 356       return (cu->cu_error.re_status = RPC_CANTSEND);
 357     }
 358
 359   /*
 360    * Hack to provide rpc-based message passing
 361    */
 362   if (timeout.tv_sec == 0 && timeout.tv_usec == 0)
 363     {
 364       return (cu->cu_error.re_status = RPC_TIMEDOUT);
 365     }
 366  get_reply:
 367   /*
 368    * sub-optimal code appears here because we have
 369    * some clock time to spare while the packets are in flight.
 370    * (We assume that this is actually only executed once.)
 371    */
 372   reply_msg.acpted_rply.ar_verf = _null_auth;
 373   reply_msg.acpted_rply.ar_results.where = resultsp;
 374   reply_msg.acpted_rply.ar_results.proc = xresults;
 375   fd.fd = cu->cu_sock;
 376   fd.events = POLLIN;
 377   anyup = 0;
 378   for (;;)
 379     {
 380       switch (__poll (&fd, 1, milliseconds))
 381         {
 382
 383         case 0:
 384           if (anyup == 0)
 385             {
 386               anyup = is_network_up (cu->cu_sock);
 387               if (!anyup)
 388                 return (cu->cu_error.re_status = RPC_CANTRECV);
 389             }
 390
 391           time_waited.tv_sec += cu->cu_wait.tv_sec;
 392           time_waited.tv_usec += cu->cu_wait.tv_usec;
 393           while (time_waited.tv_usec >= 1000000)
 394             {
 395               time_waited.tv_sec++;
 396               time_waited.tv_usec -= 1000000;
 397             }
 398           if ((time_waited.tv_sec < timeout.tv_sec) ||
 399               ((time_waited.tv_sec == timeout.tv_sec) &&
 400                (time_waited.tv_usec < timeout.tv_usec)))
 401             goto send_again;
 402           return (cu->cu_error.re_status = RPC_TIMEDOUT);
 403
 404           /*
 405            * buggy in other cases because time_waited is not being
 406            * updated.
 407            */
 408         case -1:
 409           if (errno == EINTR)
 410             continue;
 411           cu->cu_error.re_errno = errno;
 412           return (cu->cu_error.re_status = RPC_CANTRECV);
 413         }
 414 #ifdef IP_RECVERR
 415       if (fd.revents & POLLERR)
 416         {
 417           struct msghdr msg;
 418           struct cmsghdr *cmsg;
 419           struct sock_extended_err *e;
 420           struct sockaddr_in err_addr;
 421           struct iovec iov;
 422           char *cbuf = (char *) alloca (outlen + 256);
 423           int ret;
 424
 425           iov.iov_base = cbuf + 256;
 426           iov.iov_len = outlen;
 427           msg.msg_name = (void *) &err_addr;
 428           msg.msg_namelen = sizeof (err_addr);
 429           msg.msg_iov = &iov;
 430           msg.msg_iovlen = 1;
 431           msg.msg_flags = 0;
 432           msg.msg_control = cbuf;
 433           msg.msg_controllen = 256;
 434           ret = __recvmsg (cu->cu_sock, &msg, MSG_ERRQUEUE);
 435           if (ret >= 0
 436               && memcmp (cbuf + 256, cu->cu_outbuf, ret) == 0
 437               && (msg.msg_flags & MSG_ERRQUEUE)
 438               && ((msg.msg_namelen == 0
 439                    && ret >= 12)
 440                   || (msg.msg_namelen == sizeof (err_addr)
 441                       && err_addr.sin_family == AF_INET
 442                       && memcmp (&err_addr.sin_addr, &cu->cu_raddr.sin_addr,
 443                                  sizeof (err_addr.sin_addr)) == 0
 444                       && err_addr.sin_port == cu->cu_raddr.sin_port)))
 445             for (cmsg = CMSG_FIRSTHDR (&msg); cmsg;
 446                  cmsg = CMSG_NXTHDR (&msg, cmsg))
 447               if (cmsg->cmsg_level == SOL_IP && cmsg->cmsg_type == IP_RECVERR)
 448                 {
 449                   e = (struct sock_extended_err *) CMSG_DATA(cmsg);
 450                   cu->cu_error.re_errno = e->ee_errno;
 451                   return (cu->cu_error.re_status = RPC_CANTRECV);
 452                 }
 453         }
 454 #endif
 455       do
 456         {
 457           fromlen = sizeof (struct sockaddr);
 458           inlen = __recvfrom (cu->cu_sock, cu->cu_inbuf,
 459                               (int) cu->cu_recvsz, MSG_DONTWAIT,
 460                               (struct sockaddr *) &from, &fromlen);
 461         }
 462       while (inlen < 0 && errno == EINTR);
 463       if (inlen < 0)
 464         {
 465           if (errno == EWOULDBLOCK)
 466             continue;
 467           cu->cu_error.re_errno = errno;
 468           return (cu->cu_error.re_status = RPC_CANTRECV);
 469         }
 470       if (inlen < 4)
 471         continue;
 472
 473       /* see if reply transaction id matches sent id.
 474         Don't do this if we only wait for a replay */
 475       if (xargs != NULL
 476           && memcmp (cu->cu_inbuf, cu->cu_outbuf, sizeof (u_int32_t)) != 0)
 477         continue;
 478       /* we now assume we have the proper reply */
 479       break;
 480     }
 481
 482   /*
 483    * now decode and validate the response
 484    */
 485   xdrmem_create (&reply_xdrs, cu->cu_inbuf, (u_int) inlen, XDR_DECODE);
 486   ok = xdr_replymsg (&reply_xdrs, &reply_msg);
 487   /* XDR_DESTROY(&reply_xdrs);  save a few cycles on noop destroy */
 488   if (ok)
 489     {
 490       _seterr_reply (&reply_msg, &(cu->cu_error));
 491       if (cu->cu_error.re_status == RPC_SUCCESS)
 492         {
 493           if (!AUTH_VALIDATE (cl->cl_auth,
 494                               &reply_msg.acpted_rply.ar_verf))
 495             {
 496               cu->cu_error.re_status = RPC_AUTHERROR;
 497               cu->cu_error.re_why = AUTH_INVALIDRESP;
 498             }
 499           if (reply_msg.acpted_rply.ar_verf.oa_base != NULL)
 500             {
 501               xdrs->x_op = XDR_FREE;
 502               (void) xdr_opaque_auth (xdrs, &(reply_msg.acpted_rply.ar_verf));
 503             }
 504         }                       /* end successful completion */
 505       else
 506         {
 507           /* maybe our credentials need to be refreshed ... */
 508           if (nrefreshes > 0 && AUTH_REFRESH (cl->cl_auth))
 509             {
 510               nrefreshes--;
 511               goto call_again;
 512             }
 513         }                       /* end of unsuccessful completion */
 514     }                           /* end of valid reply message */
 515   else
 516     {
 517       cu->cu_error.re_status = RPC_CANTDECODERES;
 518     }
 519   return cu->cu_error.re_status;
 520 }
 521
 522 static void
 523 clntudp_geterr (CLIENT *cl, struct rpc_err *errp)
 524 {
 525   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 526
 527   *errp = cu->cu_error;
 528 }
 529
 530
 531 static bool_t
 532 clntudp_freeres (CLIENT *cl, xdrproc_t xdr_res, caddr_t res_ptr)
 533 {
 534   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 535   XDR *xdrs = &(cu->cu_outxdrs);
 536
 537   xdrs->x_op = XDR_FREE;
 538   return (*xdr_res) (xdrs, res_ptr);
 539 }
 540
 541 static void
 542 clntudp_abort (void)
 543 {
 544 }
 545
 546 static bool_t
 547 clntudp_control (CLIENT *cl, int request, char *info)
 548 {
 549   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 550
 551   switch (request)
 552     {
 553     case CLSET_FD_CLOSE:
 554       cu->cu_closeit = TRUE;
 555       break;
 556     case CLSET_FD_NCLOSE:
 557       cu->cu_closeit = FALSE;
 558       break;
 559     case CLSET_TIMEOUT:
 560       cu->cu_total = *(struct timeval *) info;
 561       break;
 562     case CLGET_TIMEOUT:
 563       *(struct timeval *) info = cu->cu_total;
 564       break;
 565     case CLSET_RETRY_TIMEOUT:
 566       cu->cu_wait = *(struct timeval *) info;
 567       break;
 568     case CLGET_RETRY_TIMEOUT:
 569       *(struct timeval *) info = cu->cu_wait;
 570       break;
 571     case CLGET_SERVER_ADDR:
 572       *(struct sockaddr_in *) info = cu->cu_raddr;
 573       break;
 574     case CLGET_FD:
 575       *(int *)info = cu->cu_sock;
 576       break;
 577     case CLGET_XID:
 578       /*
 579        * use the knowledge that xid is the
 580        * first element in the call structure *.
 581        * This will get the xid of the PREVIOUS call
 582        */
 583       *(u_long *)info = ntohl(*(u_long *)cu->cu_outbuf);
 584       break;
 585     case CLSET_XID:
 586       /* This will set the xid of the NEXT call */
 587       *(u_long *)cu->cu_outbuf =  htonl(*(u_long *)info - 1);
 588       /* decrement by 1 as clntudp_call() increments once */
 589       break;
 590     case CLGET_VERS:
 591       /*
 592        * This RELIES on the information that, in the call body,
 593        * the version number field is the fifth field from the
 594        * begining of the RPC header. MUST be changed if the
 595        * call_struct is changed
 596        */
 597       *(u_long *)info = ntohl(*(u_long *)(cu->cu_outbuf +
 598                                           4 * BYTES_PER_XDR_UNIT));
 599       break;
 600     case CLSET_VERS:
 601       *(u_long *)(cu->cu_outbuf + 4 * BYTES_PER_XDR_UNIT)
 602         = htonl(*(u_long *)info);
 603       break;
 604     case CLGET_PROG:
 605       /*
 606        * This RELIES on the information that, in the call body,
 607        * the program number field is the  field from the
 608        * begining of the RPC header. MUST be changed if the
 609        * call_struct is changed
 610        */
 611       *(u_long *)info = ntohl(*(u_long *)(cu->cu_outbuf +
 612                                           3 * BYTES_PER_XDR_UNIT));
 613       break;
 614     case CLSET_PROG:
 615       *(u_long *)(cu->cu_outbuf + 3 * BYTES_PER_XDR_UNIT)
 616         = htonl(*(u_long *)info);
 617       break;
 618     /* The following are only possible with TI-RPC */
 619     case CLGET_SVC_ADDR:
 620     case CLSET_SVC_ADDR:
 621     case CLSET_PUSH_TIMOD:
 622     case CLSET_POP_TIMOD:
 623     default:
 624       return FALSE;
 625     }
 626   return TRUE;
 627 }
 628
 629 static void
 630 clntudp_destroy (CLIENT *cl)
 631 {
 632   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 633
 634   if (cu->cu_closeit)
 635     {
 636       (void) __close (cu->cu_sock);
 637     }
 638   XDR_DESTROY (&(cu->cu_outxdrs));
 639   mem_free ((caddr_t) cu, (sizeof (*cu) + cu->cu_sendsz + cu->cu_recvsz));
 640   mem_free ((caddr_t) cl, sizeof (CLIENT));
 641 }