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       *sockp = __socket (AF_INET, SOCK_DGRAM|SOCK_NONBLOCK|flags, IPPROTO_UDP);
 175       if (__glibc_unlikely (*sockp < 0))
 176         {
 177           struct rpc_createerr *ce = &get_rpc_createerr ();
 178           ce->cf_stat = RPC_SYSTEMERROR;
 179           ce->cf_error.re_errno = errno;
 180           goto fooy;
 181         }
 182       /* attempt to bind to prov port */
 183       (void) bindresvport (*sockp, (struct sockaddr_in *) 0);
 184 #ifdef IP_RECVERR
 185       {
 186         int on = 1;
 187         __setsockopt (*sockp, SOL_IP, IP_RECVERR, &on, sizeof(on));
 188       }
 189 #endif
 190       cu->cu_closeit = TRUE;
 191     }
 192   else
 193     {
 194       cu->cu_closeit = FALSE;
 195     }
 196   cu->cu_sock = *sockp;
 197   cl->cl_auth = authnone_create ();
 198   return cl;
 199 fooy:
 200   if (cu)
 201     mem_free ((caddr_t) cu, sizeof (*cu) + sendsz + recvsz);
 202   if (cl)
 203     mem_free ((caddr_t) cl, sizeof (CLIENT));
 204   return (CLIENT *) NULL;
 205 }
 206 #ifdef EXPORT_RPC_SYMBOLS
 207 libc_hidden_def (__libc_clntudp_bufcreate)
 208 #else
 209 libc_hidden_nolink_sunrpc (__libc_clntudp_bufcreate, GLIBC_PRIVATE)
 210 #endif
 211
 212 CLIENT *
 213 clntudp_bufcreate (struct sockaddr_in *raddr, u_long program, u_long version,
 214                    struct timeval wait, int *sockp, u_int sendsz,
 215                    u_int recvsz)
 216 {
 217   return __libc_clntudp_bufcreate (raddr, program, version, wait,
 218                                    sockp, sendsz, recvsz, 0);
 219 }
 220 libc_hidden_nolink_sunrpc (clntudp_bufcreate, GLIBC_2_0)
 221
 222 CLIENT *
 223 clntudp_create (struct sockaddr_in *raddr, u_long program, u_long version,
 224                 struct timeval wait, int *sockp)
 225 {
 226   return __libc_clntudp_bufcreate (raddr, program, version, wait,
 227                                    sockp, UDPMSGSIZE, UDPMSGSIZE, 0);
 228 }
 229 #ifdef EXPORT_RPC_SYMBOLS
 230 libc_hidden_def (clntudp_create)
 231 #else
 232 libc_hidden_nolink_sunrpc (clntudp_create, GLIBC_2_0)
 233 #endif
 234
 235 static int
 236 is_network_up (int sock)
 237 {
 238   struct ifaddrs *ifa;
 239
 240   if (getifaddrs (&ifa) != 0)
 241     return 0;
 242
 243   struct ifaddrs *run = ifa;
 244   while (run != NULL)
 245     {
 246       if ((run->ifa_flags & IFF_UP) != 0
 247           && run->ifa_addr != NULL
 248           && run->ifa_addr->sa_family == AF_INET)
 249         break;
 250
 251       run = run->ifa_next;
 252     }
 253
 254   freeifaddrs (ifa);
 255
 256   return run != NULL;
 257 }
 258
 259 static enum clnt_stat
 260 clntudp_call (/* client handle */
 261               CLIENT *cl,
 262               /* procedure number */
 263               u_long proc,
 264               /* xdr routine for args */
 265               xdrproc_t xargs,
 266               /* pointer to args */
 267               caddr_t argsp,
 268               /* xdr routine for results */
 269               xdrproc_t xresults,
 270               /* pointer to results */
 271               caddr_t resultsp,
 272               /* seconds to wait before giving up */
 273               struct timeval utimeout)
 274 {
 275   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 276   XDR *xdrs;
 277   int outlen = 0;
 278   int inlen;
 279   socklen_t fromlen;
 280   struct pollfd fd;
 281   int milliseconds = (cu->cu_wait.tv_sec * 1000) +
 282     (cu->cu_wait.tv_usec / 1000);
 283   struct sockaddr_in from;
 284   struct rpc_msg reply_msg;
 285   XDR reply_xdrs;
 286   struct timeval time_waited;
 287   bool_t ok;
 288   int nrefreshes = 2;           /* number of times to refresh cred */
 289   struct timeval timeout;
 290   int anyup;                    /* any network interface up */
 291
 292   if (cu->cu_total.tv_usec == -1)
 293     {
 294       timeout = utimeout;       /* use supplied timeout */
 295     }
 296   else
 297     {
 298       timeout = cu->cu_total;   /* use default timeout */
 299     }
 300
 301   time_waited.tv_sec = 0;
 302   time_waited.tv_usec = 0;
 303 call_again:
 304   xdrs = &(cu->cu_outxdrs);
 305   if (xargs == NULL)
 306     goto get_reply;
 307   xdrs->x_op = XDR_ENCODE;
 308   XDR_SETPOS (xdrs, cu->cu_xdrpos);
 309   /*
 310    * the transaction is the first thing in the out buffer
 311    */
 312   (*(uint32_t *) (cu->cu_outbuf))++;
 313   if ((!XDR_PUTLONG (xdrs, (long *) &proc)) ||
 314       (!AUTH_MARSHALL (cl->cl_auth, xdrs)) ||
 315       (!(*xargs) (xdrs, argsp)))
 316     return (cu->cu_error.re_status = RPC_CANTENCODEARGS);
 317   outlen = (int) XDR_GETPOS (xdrs);
 318
 319 send_again:
 320   if (__sendto (cu->cu_sock, cu->cu_outbuf, outlen, 0,
 321                 (struct sockaddr *) &(cu->cu_raddr), cu->cu_rlen)
 322       != outlen)
 323     {
 324       cu->cu_error.re_errno = errno;
 325       return (cu->cu_error.re_status = RPC_CANTSEND);
 326     }
 327
 328   /*
 329    * Hack to provide rpc-based message passing
 330    */
 331   if (timeout.tv_sec == 0 && timeout.tv_usec == 0)
 332     {
 333       return (cu->cu_error.re_status = RPC_TIMEDOUT);
 334     }
 335  get_reply:
 336   /*
 337    * sub-optimal code appears here because we have
 338    * some clock time to spare while the packets are in flight.
 339    * (We assume that this is actually only executed once.)
 340    */
 341   reply_msg.acpted_rply.ar_verf = _null_auth;
 342   reply_msg.acpted_rply.ar_results.where = resultsp;
 343   reply_msg.acpted_rply.ar_results.proc = xresults;
 344   fd.fd = cu->cu_sock;
 345   fd.events = POLLIN;
 346   anyup = 0;
 347   for (;;)
 348     {
 349       switch (__poll (&fd, 1, milliseconds))
 350         {
 351
 352         case 0:
 353           if (anyup == 0)
 354             {
 355               anyup = is_network_up (cu->cu_sock);
 356               if (!anyup)
 357                 return (cu->cu_error.re_status = RPC_CANTRECV);
 358             }
 359
 360           time_waited.tv_sec += cu->cu_wait.tv_sec;
 361           time_waited.tv_usec += cu->cu_wait.tv_usec;
 362           while (time_waited.tv_usec >= 1000000)
 363             {
 364               time_waited.tv_sec++;
 365               time_waited.tv_usec -= 1000000;
 366             }
 367           if ((time_waited.tv_sec < timeout.tv_sec) ||
 368               ((time_waited.tv_sec == timeout.tv_sec) &&
 369                (time_waited.tv_usec < timeout.tv_usec)))
 370             goto send_again;
 371           return (cu->cu_error.re_status = RPC_TIMEDOUT);
 372
 373           /*
 374            * buggy in other cases because time_waited is not being
 375            * updated.
 376            */
 377         case -1:
 378           if (errno == EINTR)
 379             continue;
 380           cu->cu_error.re_errno = errno;
 381           return (cu->cu_error.re_status = RPC_CANTRECV);
 382         }
 383 #ifdef IP_RECVERR
 384       if (fd.revents & POLLERR)
 385         {
 386           struct msghdr msg;
 387           struct cmsghdr *cmsg;
 388           struct sock_extended_err *e;
 389           struct sockaddr_in err_addr;
 390           struct iovec iov;
 391           char *cbuf = (char *) alloca (outlen + 256);
 392           int ret;
 393
 394           iov.iov_base = cbuf + 256;
 395           iov.iov_len = outlen;
 396           msg.msg_name = (void *) &err_addr;
 397           msg.msg_namelen = sizeof (err_addr);
 398           msg.msg_iov = &iov;
 399           msg.msg_iovlen = 1;
 400           msg.msg_flags = 0;
 401           msg.msg_control = cbuf;
 402           msg.msg_controllen = 256;
 403           ret = __recvmsg (cu->cu_sock, &msg, MSG_ERRQUEUE);
 404           if (ret >= 0
 405               && memcmp (cbuf + 256, cu->cu_outbuf, ret) == 0
 406               && (msg.msg_flags & MSG_ERRQUEUE)
 407               && ((msg.msg_namelen == 0
 408                    && ret >= 12)
 409                   || (msg.msg_namelen == sizeof (err_addr)
 410                       && err_addr.sin_family == AF_INET
 411                       && memcmp (&err_addr.sin_addr, &cu->cu_raddr.sin_addr,
 412                                  sizeof (err_addr.sin_addr)) == 0
 413                       && err_addr.sin_port == cu->cu_raddr.sin_port)))
 414             for (cmsg = CMSG_FIRSTHDR (&msg); cmsg;
 415                  cmsg = CMSG_NXTHDR (&msg, cmsg))
 416               if (cmsg->cmsg_level == SOL_IP && cmsg->cmsg_type == IP_RECVERR)
 417                 {
 418                   e = (struct sock_extended_err *) CMSG_DATA(cmsg);
 419                   cu->cu_error.re_errno = e->ee_errno;
 420                   return (cu->cu_error.re_status = RPC_CANTRECV);
 421                 }
 422         }
 423 #endif
 424       do
 425         {
 426           fromlen = sizeof (struct sockaddr);
 427           inlen = __recvfrom (cu->cu_sock, cu->cu_inbuf,
 428                               (int) cu->cu_recvsz, MSG_DONTWAIT,
 429                               (struct sockaddr *) &from, &fromlen);
 430         }
 431       while (inlen < 0 && errno == EINTR);
 432       if (inlen < 0)
 433         {
 434           if (errno == EWOULDBLOCK)
 435             continue;
 436           cu->cu_error.re_errno = errno;
 437           return (cu->cu_error.re_status = RPC_CANTRECV);
 438         }
 439       if (inlen < 4)
 440         continue;
 441
 442       /* see if reply transaction id matches sent id.
 443         Don't do this if we only wait for a replay */
 444       if (xargs != NULL
 445           && memcmp (cu->cu_inbuf, cu->cu_outbuf, sizeof (u_int32_t)) != 0)
 446         continue;
 447       /* we now assume we have the proper reply */
 448       break;
 449     }
 450
 451   /*
 452    * now decode and validate the response
 453    */
 454   xdrmem_create (&reply_xdrs, cu->cu_inbuf, (u_int) inlen, XDR_DECODE);
 455   ok = xdr_replymsg (&reply_xdrs, &reply_msg);
 456   /* XDR_DESTROY(&reply_xdrs);  save a few cycles on noop destroy */
 457   if (ok)
 458     {
 459       _seterr_reply (&reply_msg, &(cu->cu_error));
 460       if (cu->cu_error.re_status == RPC_SUCCESS)
 461         {
 462           if (!AUTH_VALIDATE (cl->cl_auth,
 463                               &reply_msg.acpted_rply.ar_verf))
 464             {
 465               cu->cu_error.re_status = RPC_AUTHERROR;
 466               cu->cu_error.re_why = AUTH_INVALIDRESP;
 467             }
 468           if (reply_msg.acpted_rply.ar_verf.oa_base != NULL)
 469             {
 470               xdrs->x_op = XDR_FREE;
 471               (void) xdr_opaque_auth (xdrs, &(reply_msg.acpted_rply.ar_verf));
 472             }
 473         }                       /* end successful completion */
 474       else
 475         {
 476           /* maybe our credentials need to be refreshed ... */
 477           if (nrefreshes > 0 && AUTH_REFRESH (cl->cl_auth))
 478             {
 479               nrefreshes--;
 480               goto call_again;
 481             }
 482         }                       /* end of unsuccessful completion */
 483     }                           /* end of valid reply message */
 484   else
 485     {
 486       cu->cu_error.re_status = RPC_CANTDECODERES;
 487     }
 488   return cu->cu_error.re_status;
 489 }
 490
 491 static void
 492 clntudp_geterr (CLIENT *cl, struct rpc_err *errp)
 493 {
 494   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 495
 496   *errp = cu->cu_error;
 497 }
 498
 499
 500 static bool_t
 501 clntudp_freeres (CLIENT *cl, xdrproc_t xdr_res, caddr_t res_ptr)
 502 {
 503   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 504   XDR *xdrs = &(cu->cu_outxdrs);
 505
 506   xdrs->x_op = XDR_FREE;
 507   return (*xdr_res) (xdrs, res_ptr);
 508 }
 509
 510 static void
 511 clntudp_abort (void)
 512 {
 513 }
 514
 515 static bool_t
 516 clntudp_control (CLIENT *cl, int request, char *info)
 517 {
 518   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 519   u_long ul;
 520   u_int32_t ui32;
 521
 522   switch (request)
 523     {
 524     case CLSET_FD_CLOSE:
 525       cu->cu_closeit = TRUE;
 526       break;
 527     case CLSET_FD_NCLOSE:
 528       cu->cu_closeit = FALSE;
 529       break;
 530     case CLSET_TIMEOUT:
 531       cu->cu_total = *(struct timeval *) info;
 532       break;
 533     case CLGET_TIMEOUT:
 534       *(struct timeval *) info = cu->cu_total;
 535       break;
 536     case CLSET_RETRY_TIMEOUT:
 537       cu->cu_wait = *(struct timeval *) info;
 538       break;
 539     case CLGET_RETRY_TIMEOUT:
 540       *(struct timeval *) info = cu->cu_wait;
 541       break;
 542     case CLGET_SERVER_ADDR:
 543       *(struct sockaddr_in *) info = cu->cu_raddr;
 544       break;
 545     case CLGET_FD:
 546       *(int *)info = cu->cu_sock;
 547       break;
 548     case CLGET_XID:
 549       /*
 550        * use the knowledge that xid is the
 551        * first element in the call structure *.
 552        * This will get the xid of the PREVIOUS call
 553        */
 554       memcpy (&ui32, cu->cu_outbuf, sizeof (ui32));
 555       ul = ntohl (ui32);
 556       memcpy (info, &ul, sizeof (ul));
 557       break;
 558     case CLSET_XID:
 559       /* This will set the xid of the NEXT call */
 560       memcpy (&ul, info, sizeof (ul));
 561       ui32 = htonl (ul - 1);
 562       memcpy (cu->cu_outbuf, &ui32, sizeof (ui32));
 563       /* decrement by 1 as clntudp_call() increments once */
 564       break;
 565     case CLGET_VERS:
 566       /*
 567        * This RELIES on the information that, in the call body,
 568        * the version number field is the fifth field from the
 569        * beginning of the RPC header. MUST be changed if the
 570        * call_struct is changed
 571        */
 572       memcpy (&ui32, cu->cu_outbuf + 4 * BYTES_PER_XDR_UNIT, sizeof (ui32));
 573       ul = ntohl (ui32);
 574       memcpy (info, &ul, sizeof (ul));
 575       break;
 576     case CLSET_VERS:
 577       memcpy (&ul, info, sizeof (ul));
 578       ui32 = htonl (ul);
 579       memcpy (cu->cu_outbuf + 4 * BYTES_PER_XDR_UNIT, &ui32, sizeof (ui32));
 580       break;
 581     case CLGET_PROG:
 582       /*
 583        * This RELIES on the information that, in the call body,
 584        * the program number field is the  field from the
 585        * beginning of the RPC header. MUST be changed if the
 586        * call_struct is changed
 587        */
 588       memcpy (&ui32, cu->cu_outbuf + 3 * BYTES_PER_XDR_UNIT, sizeof (ui32));
 589       ul = ntohl (ui32);
 590       memcpy (info, &ul, sizeof (ul));
 591       break;
 592     case CLSET_PROG:
 593       memcpy (&ul, info, sizeof (ul));
 594       ui32 = htonl (ul);
 595       memcpy (cu->cu_outbuf + 3 * BYTES_PER_XDR_UNIT, &ui32, sizeof (ui32));
 596       break;
 597     /* The following are only possible with TI-RPC */
 598     case CLGET_SVC_ADDR:
 599     case CLSET_SVC_ADDR:
 600     case CLSET_PUSH_TIMOD:
 601     case CLSET_POP_TIMOD:
 602     default:
 603       return FALSE;
 604     }
 605   return TRUE;
 606 }
 607
 608 static void
 609 clntudp_destroy (CLIENT *cl)
 610 {
 611   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 612
 613   if (cu->cu_closeit)
 614     {
 615       (void) __close (cu->cu_sock);
 616     }
 617   XDR_DESTROY (&(cu->cu_outxdrs));
 618   mem_free ((caddr_t) cu, (sizeof (*cu) + cu->cu_sendsz + cu->cu_recvsz));
 619   mem_free ((caddr_t) cl, sizeof (CLIENT));
 620 }