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
  59 extern u_long _create_xid (void);
  60
  61 /*
  62  * UDP bases client side rpc operations
  63  */
  64 static enum clnt_stat clntudp_call (CLIENT *, u_long, xdrproc_t, caddr_t,
  65                                     xdrproc_t, caddr_t, struct timeval);
  66 static void clntudp_abort (void);
  67 static void clntudp_geterr (CLIENT *, struct rpc_err *);
  68 static bool_t clntudp_freeres (CLIENT *, xdrproc_t, caddr_t);
  69 static bool_t clntudp_control (CLIENT *, int, char *);
  70 static void clntudp_destroy (CLIENT *);
  71
  72 static const struct clnt_ops udp_ops =
  73 {
  74   clntudp_call,
  75   clntudp_abort,
  76   clntudp_geterr,
  77   clntudp_freeres,
  78   clntudp_destroy,
  79   clntudp_control
  80 };
  81
  82 /*
  83  * Private data kept per client handle
  84  */
  85 struct cu_data
  86   {
  87     int cu_sock;
  88     bool_t cu_closeit;
  89     struct sockaddr_in cu_raddr;
  90     int cu_rlen;
  91     struct timeval cu_wait;
  92     struct timeval cu_total;
  93     struct rpc_err cu_error;
  94     XDR cu_outxdrs;
  95     u_int cu_xdrpos;
  96     u_int cu_sendsz;
  97     char *cu_outbuf;
  98     u_int cu_recvsz;
  99     char cu_inbuf[1];
 100   };
 101
 102 /*
 103  * Create a UDP based client handle.
 104  * If *sockp<0, *sockp is set to a newly created UPD socket.
 105  * If raddr->sin_port is 0 a binder on the remote machine
 106  * is consulted for the correct port number.
 107  * NB: It is the clients responsibility to close *sockp.
 108  * NB: The rpch->cl_auth is initialized to null authentication.
 109  *     Caller may wish to set this something more useful.
 110  *
 111  * wait is the amount of time used between retransmitting a call if
 112  * no response has been heard; retransmission occurs until the actual
 113  * rpc call times out.
 114  *
 115  * sendsz and recvsz are the maximum allowable packet sizes that can be
 116  * sent and received.
 117  */
 118 CLIENT *
 119 __libc_clntudp_bufcreate (struct sockaddr_in *raddr, u_long program,
 120                           u_long version, struct timeval wait, int *sockp,
 121                           u_int sendsz, u_int recvsz, int flags)
 122 {
 123   CLIENT *cl;
 124   struct cu_data *cu = NULL;
 125   struct rpc_msg call_msg;
 126
 127   cl = (CLIENT *) mem_alloc (sizeof (CLIENT));
 128   sendsz = ((sendsz + 3) / 4) * 4;
 129   recvsz = ((recvsz + 3) / 4) * 4;
 130   cu = (struct cu_data *) mem_alloc (sizeof (*cu) + sendsz + recvsz);
 131   if (cl == NULL || cu == NULL)
 132     {
 133       struct rpc_createerr *ce = &get_rpc_createerr ();
 134       (void) __fxprintf (NULL, "%s: %s",
 135                          "clntudp_create", _("out of memory\n"));
 136       ce->cf_stat = RPC_SYSTEMERROR;
 137       ce->cf_error.re_errno = ENOMEM;
 138       goto fooy;
 139     }
 140   cu->cu_outbuf = &cu->cu_inbuf[recvsz];
 141
 142   if (raddr->sin_port == 0)
 143     {
 144       u_short port;
 145       if ((port =
 146            pmap_getport (raddr, program, version, IPPROTO_UDP)) == 0)
 147         {
 148           goto fooy;
 149         }
 150       raddr->sin_port = htons (port);
 151     }
 152   cl->cl_ops = (struct clnt_ops *) &udp_ops;
 153   cl->cl_private = (caddr_t) cu;
 154   cu->cu_raddr = *raddr;
 155   cu->cu_rlen = sizeof (cu->cu_raddr);
 156   cu->cu_wait = wait;
 157   cu->cu_total.tv_sec = -1;
 158   cu->cu_total.tv_usec = -1;
 159   cu->cu_sendsz = sendsz;
 160   cu->cu_recvsz = recvsz;
 161   call_msg.rm_xid = _create_xid ();
 162   call_msg.rm_direction = CALL;
 163   call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
 164   call_msg.rm_call.cb_prog = program;
 165   call_msg.rm_call.cb_vers = version;
 166   xdrmem_create (&(cu->cu_outxdrs), cu->cu_outbuf, sendsz, XDR_ENCODE);
 167   if (!xdr_callhdr (&(cu->cu_outxdrs), &call_msg))
 168     {
 169       goto fooy;
 170     }
 171   cu->cu_xdrpos = XDR_GETPOS (&(cu->cu_outxdrs));
 172   if (*sockp < 0)
 173     {
 174 #ifdef SOCK_NONBLOCK
 175 # ifndef __ASSUME_SOCK_CLOEXEC
 176       if (__have_sock_cloexec >= 0)
 177 # endif
 178         {
 179           *sockp = __socket (AF_INET, SOCK_DGRAM|SOCK_NONBLOCK|flags,
 180                              IPPROTO_UDP);
 181 # ifndef __ASSUME_SOCK_CLOEXEC
 182           if (__have_sock_cloexec == 0)
 183             __have_sock_cloexec = *sockp >= 0 || errno != EINVAL ? 1 : -1;
 184 # endif
 185         }
 186 #endif
 187 #ifndef __ASSUME_SOCK_CLOEXEC
 188 # ifdef SOCK_CLOEXEC
 189       if (__have_sock_cloexec < 0)
 190 # endif
 191         {
 192           *sockp = __socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 193 # ifdef SOCK_CLOEXEC
 194           if (flags & SOCK_CLOEXEC)
 195             __fcntl (*sockp, F_SETFD, FD_CLOEXEC);
 196 # endif
 197         }
 198 #endif
 199       if (__glibc_unlikely (*sockp < 0))
 200         {
 201           struct rpc_createerr *ce = &get_rpc_createerr ();
 202           ce->cf_stat = RPC_SYSTEMERROR;
 203           ce->cf_error.re_errno = errno;
 204           goto fooy;
 205         }
 206       /* attempt to bind to prov port */
 207       (void) bindresvport (*sockp, (struct sockaddr_in *) 0);
 208 #ifndef __ASSUME_SOCK_CLOEXEC
 209 # ifdef SOCK_CLOEXEC
 210       if (__have_sock_cloexec < 0)
 211 # endif
 212         {
 213           /* the sockets rpc controls are non-blocking */
 214           int dontblock = 1;
 215           (void) __ioctl (*sockp, FIONBIO, (char *) &dontblock);
 216         }
 217 #endif
 218 #ifdef IP_RECVERR
 219       {
 220         int on = 1;
 221         __setsockopt (*sockp, SOL_IP, IP_RECVERR, &on, sizeof(on));
 222       }
 223 #endif
 224       cu->cu_closeit = TRUE;
 225     }
 226   else
 227     {
 228       cu->cu_closeit = FALSE;
 229     }
 230   cu->cu_sock = *sockp;
 231   cl->cl_auth = authnone_create ();
 232   return cl;
 233 fooy:
 234   if (cu)
 235     mem_free ((caddr_t) cu, sizeof (*cu) + sendsz + recvsz);
 236   if (cl)
 237     mem_free ((caddr_t) cl, sizeof (CLIENT));
 238   return (CLIENT *) NULL;
 239 }
 240 #ifdef EXPORT_RPC_SYMBOLS
 241 libc_hidden_def (__libc_clntudp_bufcreate)
 242 #else
 243 libc_hidden_nolink_sunrpc (__libc_clntudp_bufcreate, GLIBC_PRIVATE)
 244 #endif
 245
 246 CLIENT *
 247 clntudp_bufcreate (struct sockaddr_in *raddr, u_long program, u_long version,
 248                    struct timeval wait, int *sockp, u_int sendsz,
 249                    u_int recvsz)
 250 {
 251   return __libc_clntudp_bufcreate (raddr, program, version, wait,
 252                                    sockp, sendsz, recvsz, 0);
 253 }
 254 libc_hidden_nolink_sunrpc (clntudp_bufcreate, GLIBC_2_0)
 255
 256 CLIENT *
 257 clntudp_create (raddr, program, version, wait, sockp)
 258      struct sockaddr_in *raddr;
 259      u_long program;
 260      u_long version;
 261      struct timeval wait;
 262      int *sockp;
 263 {
 264   return __libc_clntudp_bufcreate (raddr, program, version, wait,
 265                                    sockp, UDPMSGSIZE, UDPMSGSIZE, 0);
 266 }
 267 #ifdef EXPORT_RPC_SYMBOLS
 268 libc_hidden_def (clntudp_create)
 269 #else
 270 libc_hidden_nolink_sunrpc (clntudp_create, GLIBC_2_0)
 271 #endif
 272
 273 static int
 274 is_network_up (int sock)
 275 {
 276   struct ifaddrs *ifa;
 277
 278   if (getifaddrs (&ifa) != 0)
 279     return 0;
 280
 281   struct ifaddrs *run = ifa;
 282   while (run != NULL)
 283     {
 284       if ((run->ifa_flags & IFF_UP) != 0
 285           && run->ifa_addr != NULL
 286           && run->ifa_addr->sa_family == AF_INET)
 287         break;
 288
 289       run = run->ifa_next;
 290     }
 291
 292   freeifaddrs (ifa);
 293
 294   return run != NULL;
 295 }
 296
 297 static enum clnt_stat
 298 clntudp_call (cl, proc, xargs, argsp, xresults, resultsp, utimeout)
 299      CLIENT *cl;        /* client handle */
 300      u_long proc;               /* procedure number */
 301      xdrproc_t xargs;           /* xdr routine for args */
 302      caddr_t argsp;             /* pointer to args */
 303      xdrproc_t xresults;        /* xdr routine for results */
 304      caddr_t resultsp;          /* pointer to results */
 305      struct timeval utimeout;   /* seconds to wait before giving up */
 306 {
 307   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 308   XDR *xdrs;
 309   int outlen = 0;
 310   int inlen;
 311   socklen_t fromlen;
 312   struct pollfd fd;
 313   int milliseconds = (cu->cu_wait.tv_sec * 1000) +
 314     (cu->cu_wait.tv_usec / 1000);
 315   struct sockaddr_in from;
 316   struct rpc_msg reply_msg;
 317   XDR reply_xdrs;
 318   struct timeval time_waited;
 319   bool_t ok;
 320   int nrefreshes = 2;           /* number of times to refresh cred */
 321   struct timeval timeout;
 322   int anyup;                    /* any network interface up */
 323
 324   if (cu->cu_total.tv_usec == -1)
 325     {
 326       timeout = utimeout;       /* use supplied timeout */
 327     }
 328   else
 329     {
 330       timeout = cu->cu_total;   /* use default timeout */
 331     }
 332
 333   time_waited.tv_sec = 0;
 334   time_waited.tv_usec = 0;
 335 call_again:
 336   xdrs = &(cu->cu_outxdrs);
 337   if (xargs == NULL)
 338     goto get_reply;
 339   xdrs->x_op = XDR_ENCODE;
 340   XDR_SETPOS (xdrs, cu->cu_xdrpos);
 341   /*
 342    * the transaction is the first thing in the out buffer
 343    */
 344   (*(uint32_t *) (cu->cu_outbuf))++;
 345   if ((!XDR_PUTLONG (xdrs, (long *) &proc)) ||
 346       (!AUTH_MARSHALL (cl->cl_auth, xdrs)) ||
 347       (!(*xargs) (xdrs, argsp)))
 348     return (cu->cu_error.re_status = RPC_CANTENCODEARGS);
 349   outlen = (int) XDR_GETPOS (xdrs);
 350
 351 send_again:
 352   if (__sendto (cu->cu_sock, cu->cu_outbuf, outlen, 0,
 353                 (struct sockaddr *) &(cu->cu_raddr), cu->cu_rlen)
 354       != outlen)
 355     {
 356       cu->cu_error.re_errno = errno;
 357       return (cu->cu_error.re_status = RPC_CANTSEND);
 358     }
 359
 360   /*
 361    * Hack to provide rpc-based message passing
 362    */
 363   if (timeout.tv_sec == 0 && timeout.tv_usec == 0)
 364     {
 365       return (cu->cu_error.re_status = RPC_TIMEDOUT);
 366     }
 367  get_reply:
 368   /*
 369    * sub-optimal code appears here because we have
 370    * some clock time to spare while the packets are in flight.
 371    * (We assume that this is actually only executed once.)
 372    */
 373   reply_msg.acpted_rply.ar_verf = _null_auth;
 374   reply_msg.acpted_rply.ar_results.where = resultsp;
 375   reply_msg.acpted_rply.ar_results.proc = xresults;
 376   fd.fd = cu->cu_sock;
 377   fd.events = POLLIN;
 378   anyup = 0;
 379   for (;;)
 380     {
 381       switch (__poll (&fd, 1, milliseconds))
 382         {
 383
 384         case 0:
 385           if (anyup == 0)
 386             {
 387               anyup = is_network_up (cu->cu_sock);
 388               if (!anyup)
 389                 return (cu->cu_error.re_status = RPC_CANTRECV);
 390             }
 391
 392           time_waited.tv_sec += cu->cu_wait.tv_sec;
 393           time_waited.tv_usec += cu->cu_wait.tv_usec;
 394           while (time_waited.tv_usec >= 1000000)
 395             {
 396               time_waited.tv_sec++;
 397               time_waited.tv_usec -= 1000000;
 398             }
 399           if ((time_waited.tv_sec < timeout.tv_sec) ||
 400               ((time_waited.tv_sec == timeout.tv_sec) &&
 401                (time_waited.tv_usec < timeout.tv_usec)))
 402             goto send_again;
 403           return (cu->cu_error.re_status = RPC_TIMEDOUT);
 404
 405           /*
 406            * buggy in other cases because time_waited is not being
 407            * updated.
 408            */
 409         case -1:
 410           if (errno == EINTR)
 411             continue;
 412           cu->cu_error.re_errno = errno;
 413           return (cu->cu_error.re_status = RPC_CANTRECV);
 414         }
 415 #ifdef IP_RECVERR
 416       if (fd.revents & POLLERR)
 417         {
 418           struct msghdr msg;
 419           struct cmsghdr *cmsg;
 420           struct sock_extended_err *e;
 421           struct sockaddr_in err_addr;
 422           struct iovec iov;
 423           char *cbuf = (char *) alloca (outlen + 256);
 424           int ret;
 425
 426           iov.iov_base = cbuf + 256;
 427           iov.iov_len = outlen;
 428           msg.msg_name = (void *) &err_addr;
 429           msg.msg_namelen = sizeof (err_addr);
 430           msg.msg_iov = &iov;
 431           msg.msg_iovlen = 1;
 432           msg.msg_flags = 0;
 433           msg.msg_control = cbuf;
 434           msg.msg_controllen = 256;
 435           ret = __recvmsg (cu->cu_sock, &msg, MSG_ERRQUEUE);
 436           if (ret >= 0
 437               && memcmp (cbuf + 256, cu->cu_outbuf, ret) == 0
 438               && (msg.msg_flags & MSG_ERRQUEUE)
 439               && ((msg.msg_namelen == 0
 440                    && ret >= 12)
 441                   || (msg.msg_namelen == sizeof (err_addr)
 442                       && err_addr.sin_family == AF_INET
 443                       && memcmp (&err_addr.sin_addr, &cu->cu_raddr.sin_addr,
 444                                  sizeof (err_addr.sin_addr)) == 0
 445                       && err_addr.sin_port == cu->cu_raddr.sin_port)))
 446             for (cmsg = CMSG_FIRSTHDR (&msg); cmsg;
 447                  cmsg = CMSG_NXTHDR (&msg, cmsg))
 448               if (cmsg->cmsg_level == SOL_IP && cmsg->cmsg_type == IP_RECVERR)
 449                 {
 450                   e = (struct sock_extended_err *) CMSG_DATA(cmsg);
 451                   cu->cu_error.re_errno = e->ee_errno;
 452                   return (cu->cu_error.re_status = RPC_CANTRECV);
 453                 }
 454         }
 455 #endif
 456       do
 457         {
 458           fromlen = sizeof (struct sockaddr);
 459           inlen = __recvfrom (cu->cu_sock, cu->cu_inbuf,
 460                               (int) cu->cu_recvsz, MSG_DONTWAIT,
 461                               (struct sockaddr *) &from, &fromlen);
 462         }
 463       while (inlen < 0 && errno == EINTR);
 464       if (inlen < 0)
 465         {
 466           if (errno == EWOULDBLOCK)
 467             continue;
 468           cu->cu_error.re_errno = errno;
 469           return (cu->cu_error.re_status = RPC_CANTRECV);
 470         }
 471       if (inlen < 4)
 472         continue;
 473
 474       /* see if reply transaction id matches sent id.
 475         Don't do this if we only wait for a replay */
 476       if (xargs != NULL
 477           && memcmp (cu->cu_inbuf, cu->cu_outbuf, sizeof (u_int32_t)) != 0)
 478         continue;
 479       /* we now assume we have the proper reply */
 480       break;
 481     }
 482
 483   /*
 484    * now decode and validate the response
 485    */
 486   xdrmem_create (&reply_xdrs, cu->cu_inbuf, (u_int) inlen, XDR_DECODE);
 487   ok = xdr_replymsg (&reply_xdrs, &reply_msg);
 488   /* XDR_DESTROY(&reply_xdrs);  save a few cycles on noop destroy */
 489   if (ok)
 490     {
 491       _seterr_reply (&reply_msg, &(cu->cu_error));
 492       if (cu->cu_error.re_status == RPC_SUCCESS)
 493         {
 494           if (!AUTH_VALIDATE (cl->cl_auth,
 495                               &reply_msg.acpted_rply.ar_verf))
 496             {
 497               cu->cu_error.re_status = RPC_AUTHERROR;
 498               cu->cu_error.re_why = AUTH_INVALIDRESP;
 499             }
 500           if (reply_msg.acpted_rply.ar_verf.oa_base != NULL)
 501             {
 502               xdrs->x_op = XDR_FREE;
 503               (void) xdr_opaque_auth (xdrs, &(reply_msg.acpted_rply.ar_verf));
 504             }
 505         }                       /* end successful completion */
 506       else
 507         {
 508           /* maybe our credentials need to be refreshed ... */
 509           if (nrefreshes > 0 && AUTH_REFRESH (cl->cl_auth))
 510             {
 511               nrefreshes--;
 512               goto call_again;
 513             }
 514         }                       /* end of unsuccessful completion */
 515     }                           /* end of valid reply message */
 516   else
 517     {
 518       cu->cu_error.re_status = RPC_CANTDECODERES;
 519     }
 520   return cu->cu_error.re_status;
 521 }
 522
 523 static void
 524 clntudp_geterr (CLIENT *cl, struct rpc_err *errp)
 525 {
 526   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 527
 528   *errp = cu->cu_error;
 529 }
 530
 531
 532 static bool_t
 533 clntudp_freeres (CLIENT *cl, xdrproc_t xdr_res, caddr_t res_ptr)
 534 {
 535   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 536   XDR *xdrs = &(cu->cu_outxdrs);
 537
 538   xdrs->x_op = XDR_FREE;
 539   return (*xdr_res) (xdrs, res_ptr);
 540 }
 541
 542 static void
 543 clntudp_abort (void)
 544 {
 545 }
 546
 547 static bool_t
 548 clntudp_control (CLIENT *cl, int request, char *info)
 549 {
 550   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 551   u_long ul;
 552   u_int32_t ui32;
 553
 554   switch (request)
 555     {
 556     case CLSET_FD_CLOSE:
 557       cu->cu_closeit = TRUE;
 558       break;
 559     case CLSET_FD_NCLOSE:
 560       cu->cu_closeit = FALSE;
 561       break;
 562     case CLSET_TIMEOUT:
 563       cu->cu_total = *(struct timeval *) info;
 564       break;
 565     case CLGET_TIMEOUT:
 566       *(struct timeval *) info = cu->cu_total;
 567       break;
 568     case CLSET_RETRY_TIMEOUT:
 569       cu->cu_wait = *(struct timeval *) info;
 570       break;
 571     case CLGET_RETRY_TIMEOUT:
 572       *(struct timeval *) info = cu->cu_wait;
 573       break;
 574     case CLGET_SERVER_ADDR:
 575       *(struct sockaddr_in *) info = cu->cu_raddr;
 576       break;
 577     case CLGET_FD:
 578       *(int *)info = cu->cu_sock;
 579       break;
 580     case CLGET_XID:
 581       /*
 582        * use the knowledge that xid is the
 583        * first element in the call structure *.
 584        * This will get the xid of the PREVIOUS call
 585        */
 586       memcpy (&ui32, cu->cu_outbuf, sizeof (ui32));
 587       ul = ntohl (ui32);
 588       memcpy (info, &ul, sizeof (ul));
 589       break;
 590     case CLSET_XID:
 591       /* This will set the xid of the NEXT call */
 592       memcpy (&ul, info, sizeof (ul));
 593       ui32 = htonl (ul - 1);
 594       memcpy (cu->cu_outbuf, &ui32, sizeof (ui32));
 595       /* decrement by 1 as clntudp_call() increments once */
 596       break;
 597     case CLGET_VERS:
 598       /*
 599        * This RELIES on the information that, in the call body,
 600        * the version number field is the fifth field from the
 601        * beginning of the RPC header. MUST be changed if the
 602        * call_struct is changed
 603        */
 604       memcpy (&ui32, cu->cu_outbuf + 4 * BYTES_PER_XDR_UNIT, sizeof (ui32));
 605       ul = ntohl (ui32);
 606       memcpy (info, &ul, sizeof (ul));
 607       break;
 608     case CLSET_VERS:
 609       memcpy (&ul, info, sizeof (ul));
 610       ui32 = htonl (ul);
 611       memcpy (cu->cu_outbuf + 4 * BYTES_PER_XDR_UNIT, &ui32, sizeof (ui32));
 612       break;
 613     case CLGET_PROG:
 614       /*
 615        * This RELIES on the information that, in the call body,
 616        * the program number field is the  field from the
 617        * beginning of the RPC header. MUST be changed if the
 618        * call_struct is changed
 619        */
 620       memcpy (&ui32, cu->cu_outbuf + 3 * BYTES_PER_XDR_UNIT, sizeof (ui32));
 621       ul = ntohl (ui32);
 622       memcpy (info, &ul, sizeof (ul));
 623       break;
 624     case CLSET_PROG:
 625       memcpy (&ul, info, sizeof (ul));
 626       ui32 = htonl (ul);
 627       memcpy (cu->cu_outbuf + 3 * BYTES_PER_XDR_UNIT, &ui32, sizeof (ui32));
 628       break;
 629     /* The following are only possible with TI-RPC */
 630     case CLGET_SVC_ADDR:
 631     case CLSET_SVC_ADDR:
 632     case CLSET_PUSH_TIMOD:
 633     case CLSET_POP_TIMOD:
 634     default:
 635       return FALSE;
 636     }
 637   return TRUE;
 638 }
 639
 640 static void
 641 clntudp_destroy (CLIENT *cl)
 642 {
 643   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 644
 645   if (cu->cu_closeit)
 646     {
 647       (void) __close (cu->cu_sock);
 648     }
 649   XDR_DESTROY (&(cu->cu_outxdrs));
 650   mem_free ((caddr_t) cu, (sizeof (*cu) + cu->cu_sendsz + cu->cu_recvsz));
 651   mem_free ((caddr_t) cl, sizeof (CLIENT));
 652 }