sunrpc/clnt_udp.c

   1 /* @(#)clnt_udp.c       2.2 88/08/01 4.0 RPCSRC */
   2 /*
   3  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   4  * unrestricted use provided that this legend is included on all tape
   5  * media and as a part of the software program in whole or part.  Users
   6  * may copy or modify Sun RPC without charge, but are not authorized
   7  * to license or distribute it to anyone else except as part of a product or
   8  * program developed by the user.
   9  *
  10  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  11  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  12  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  13  *
  14  * Sun RPC is provided with no support and without any obligation on the
  15  * part of Sun Microsystems, Inc. to assist in its use, correction,
  16  * modification or enhancement.
  17  *
  18  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  19  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  20  * OR ANY PART THEREOF.
  21  *
  22  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  23  * or profits or other special, indirect and consequential damages, even if
  24  * Sun has been advised of the possibility of such damages.
  25  *
  26  * Sun Microsystems, Inc.
  27  * 2550 Garcia Avenue
  28  * Mountain View, California  94043
  29  */
  30 #if !defined(lint) && defined(SCCSIDS)
  31 static char sccsid[] = "@(#)clnt_udp.c 1.39 87/08/11 Copyr 1984 Sun Micro";
  32 #endif
  33
  34 /*
  35  * clnt_udp.c, Implements a UDP/IP based, client side RPC.
  36  *
  37  * Copyright (C) 1984, Sun Microsystems, Inc.
  38  */
  39
  40 #include <stdio.h>
  41 #include <unistd.h>
  42 #include <libintl.h>
  43 #include <rpc/rpc.h>
  44 #include <rpc/xdr.h>
  45 #include <rpc/clnt.h>
  46 #include <sys/poll.h>
  47 #include <sys/socket.h>
  48 #include <sys/ioctl.h>
  49 #include <netdb.h>
  50 #include <errno.h>
  51 #include <rpc/pmap_clnt.h>
  52 #include <net/if.h>
  53 #include <ifaddrs.h>
  54 #ifdef USE_IN_LIBIO
  55 # include <wchar.h>
  56 #endif
  57 #include <fcntl.h>
  58
  59 #ifdef IP_RECVERR
  60 #include <errqueue.h>
  61 #include <sys/uio.h>
  62 #endif
  63
  64 #include <kernel-features.h>
  65
  66 extern bool_t xdr_opaque_auth (XDR *, struct opaque_auth *);
  67 extern u_long _create_xid (void);
  68
  69 /*
  70  * UDP bases client side rpc operations
  71  */
  72 static enum clnt_stat clntudp_call (CLIENT *, u_long, xdrproc_t, caddr_t,
  73                                     xdrproc_t, caddr_t, struct timeval);
  74 static void clntudp_abort (void);
  75 static void clntudp_geterr (CLIENT *, struct rpc_err *);
  76 static bool_t clntudp_freeres (CLIENT *, xdrproc_t, caddr_t);
  77 static bool_t clntudp_control (CLIENT *, int, char *);
  78 static void clntudp_destroy (CLIENT *);
  79
  80 static const struct clnt_ops udp_ops =
  81 {
  82   clntudp_call,
  83   clntudp_abort,
  84   clntudp_geterr,
  85   clntudp_freeres,
  86   clntudp_destroy,
  87   clntudp_control
  88 };
  89
  90 /*
  91  * Private data kept per client handle
  92  */
  93 struct cu_data
  94   {
  95     int cu_sock;
  96     bool_t cu_closeit;
  97     struct sockaddr_in cu_raddr;
  98     int cu_rlen;
  99     struct timeval cu_wait;
 100     struct timeval cu_total;
 101     struct rpc_err cu_error;
 102     XDR cu_outxdrs;
 103     u_int cu_xdrpos;
 104     u_int cu_sendsz;
 105     char *cu_outbuf;
 106     u_int cu_recvsz;
 107     char cu_inbuf[1];
 108   };
 109
 110 /*
 111  * Create a UDP based client handle.
 112  * If *sockp<0, *sockp is set to a newly created UPD socket.
 113  * If raddr->sin_port is 0 a binder on the remote machine
 114  * is consulted for the correct port number.
 115  * NB: It is the clients responsibility to close *sockp.
 116  * NB: The rpch->cl_auth is initialized to null authentication.
 117  *     Caller may wish to set this something more useful.
 118  *
 119  * wait is the amount of time used between retransmitting a call if
 120  * no response has been heard; retransmission occurs until the actual
 121  * rpc call times out.
 122  *
 123  * sendsz and recvsz are the maximum allowable packet sizes that can be
 124  * sent and received.
 125  */
 126 CLIENT *
 127 __libc_clntudp_bufcreate (struct sockaddr_in *raddr, u_long program,
 128                           u_long version, struct timeval wait, int *sockp,
 129                           u_int sendsz, u_int recvsz, int flags)
 130 {
 131   CLIENT *cl;
 132   struct cu_data *cu = NULL;
 133   struct rpc_msg call_msg;
 134
 135   cl = (CLIENT *) mem_alloc (sizeof (CLIENT));
 136   sendsz = ((sendsz + 3) / 4) * 4;
 137   recvsz = ((recvsz + 3) / 4) * 4;
 138   cu = (struct cu_data *) mem_alloc (sizeof (*cu) + sendsz + recvsz);
 139   if (cl == NULL || cu == NULL)
 140     {
 141       struct rpc_createerr *ce = &get_rpc_createerr ();
 142       (void) __fxprintf (NULL, "%s: %s",
 143                          "clntudp_create", _("out of memory\n"));
 144       ce->cf_stat = RPC_SYSTEMERROR;
 145       ce->cf_error.re_errno = ENOMEM;
 146       goto fooy;
 147     }
 148   cu->cu_outbuf = &cu->cu_inbuf[recvsz];
 149
 150   if (raddr->sin_port == 0)
 151     {
 152       u_short port;
 153       if ((port =
 154            pmap_getport (raddr, program, version, IPPROTO_UDP)) == 0)
 155         {
 156           goto fooy;
 157         }
 158       raddr->sin_port = htons (port);
 159     }
 160   cl->cl_ops = (struct clnt_ops *) &udp_ops;
 161   cl->cl_private = (caddr_t) cu;
 162   cu->cu_raddr = *raddr;
 163   cu->cu_rlen = sizeof (cu->cu_raddr);
 164   cu->cu_wait = wait;
 165   cu->cu_total.tv_sec = -1;
 166   cu->cu_total.tv_usec = -1;
 167   cu->cu_sendsz = sendsz;
 168   cu->cu_recvsz = recvsz;
 169   call_msg.rm_xid = _create_xid ();
 170   call_msg.rm_direction = CALL;
 171   call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
 172   call_msg.rm_call.cb_prog = program;
 173   call_msg.rm_call.cb_vers = version;
 174   INTUSE(xdrmem_create) (&(cu->cu_outxdrs), cu->cu_outbuf, sendsz, XDR_ENCODE);
 175   if (!INTUSE(xdr_callhdr) (&(cu->cu_outxdrs), &call_msg))
 176     {
 177       goto fooy;
 178     }
 179   cu->cu_xdrpos = XDR_GETPOS (&(cu->cu_outxdrs));
 180   if (*sockp < 0)
 181     {
 182       int dontblock = 1;
 183
 184 #ifdef SOCK_NONBLOCK
 185 # ifndef __ASSUME_SOCK_CLOEXEC
 186       if (__have_sock_cloexec >= 0)
 187 # endif
 188         {
 189           *sockp = __socket (AF_INET, SOCK_DGRAM|SOCK_NONBLOCK|flags,
 190                              IPPROTO_UDP);
 191 # ifndef __ASSUME_SOCK_CLOEXEC
 192           if (__have_sock_cloexec == 0)
 193             __have_sock_cloexec = *sockp >= 0 || errno != EINVAL ? 1 : -1;
 194 # endif
 195         }
 196 #endif
 197 #ifndef __ASSUME_SOCK_CLOEXEC
 198 # ifdef SOCK_CLOEXEC
 199       if (__have_sock_cloexec < 0)
 200 # endif
 201         {
 202           *sockp = __socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 203 # ifdef SOCK_CLOEXEC
 204           if (flags & SOCK_CLOEXEC)
 205             __fcntl (*sockp, F_SETFD, FD_CLOEXEC);
 206 # endif
 207         }
 208 #endif
 209       if (__builtin_expect (*sockp < 0, 0))
 210         {
 211           struct rpc_createerr *ce = &get_rpc_createerr ();
 212           ce->cf_stat = RPC_SYSTEMERROR;
 213           ce->cf_error.re_errno = errno;
 214           goto fooy;
 215         }
 216       /* attempt to bind to prov port */
 217       (void) bindresvport (*sockp, (struct sockaddr_in *) 0);
 218 #ifndef __ASSUME_SOCK_CLOEXEC
 219 # ifdef SOCK_CLOEXEC
 220       if (__have_sock_cloexec < 0)
 221 # endif
 222         /* the sockets rpc controls are non-blocking */
 223         (void) __ioctl (*sockp, FIONBIO, (char *) &dontblock);
 224 #endif
 225 #ifdef IP_RECVERR
 226       {
 227         int on = 1;
 228         __setsockopt (*sockp, SOL_IP, IP_RECVERR, &on, sizeof(on));
 229       }
 230 #endif
 231       cu->cu_closeit = TRUE;
 232     }
 233   else
 234     {
 235       cu->cu_closeit = FALSE;
 236     }
 237   cu->cu_sock = *sockp;
 238   cl->cl_auth = INTUSE(authnone_create) ();
 239   return cl;
 240 fooy:
 241   if (cu)
 242     mem_free ((caddr_t) cu, sizeof (*cu) + sendsz + recvsz);
 243   if (cl)
 244     mem_free ((caddr_t) cl, sizeof (CLIENT));
 245   return (CLIENT *) NULL;
 246 }
 247 INTDEF (__libc_clntudp_bufcreate)
 248
 249 CLIENT *
 250 clntudp_bufcreate (struct sockaddr_in *raddr, u_long program, u_long version,
 251                    struct timeval wait, int *sockp, u_int sendsz,
 252                    u_int recvsz)
 253 {
 254   return INTUSE(__libc_clntudp_bufcreate) (raddr, program, version, wait,
 255                                            sockp, sendsz, recvsz, 0);
 256 }
 257 INTDEF (clntudp_bufcreate)
 258
 259 CLIENT *
 260 clntudp_create (raddr, program, version, wait, sockp)
 261      struct sockaddr_in *raddr;
 262      u_long program;
 263      u_long version;
 264      struct timeval wait;
 265      int *sockp;
 266 {
 267   return INTUSE(__libc_clntudp_bufcreate) (raddr, program, version, wait,
 268                                            sockp, UDPMSGSIZE, UDPMSGSIZE, 0);
 269 }
 270 INTDEF (clntudp_create)
 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           && (*((u_int32_t *) (cu->cu_inbuf))
 477               != *((u_int32_t *) (cu->cu_outbuf))))
 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   INTUSE(xdrmem_create) (&reply_xdrs, cu->cu_inbuf, (u_int) inlen, XDR_DECODE);
 487   ok = INTUSE(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) INTUSE(xdr_opaque_auth) (xdrs,
 504                                               &(reply_msg.acpted_rply.ar_verf));
 505             }
 506         }                       /* end successful completion */
 507       else
 508         {
 509           /* maybe our credentials need to be refreshed ... */
 510           if (nrefreshes > 0 && AUTH_REFRESH (cl->cl_auth))
 511             {
 512               nrefreshes--;
 513               goto call_again;
 514             }
 515         }                       /* end of unsuccessful completion */
 516     }                           /* end of valid reply message */
 517   else
 518     {
 519       cu->cu_error.re_status = RPC_CANTDECODERES;
 520     }
 521   return cu->cu_error.re_status;
 522 }
 523
 524 static void
 525 clntudp_geterr (CLIENT *cl, struct rpc_err *errp)
 526 {
 527   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 528
 529   *errp = cu->cu_error;
 530 }
 531
 532
 533 static bool_t
 534 clntudp_freeres (CLIENT *cl, xdrproc_t xdr_res, caddr_t res_ptr)
 535 {
 536   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 537   XDR *xdrs = &(cu->cu_outxdrs);
 538
 539   xdrs->x_op = XDR_FREE;
 540   return (*xdr_res) (xdrs, res_ptr);
 541 }
 542
 543 static void
 544 clntudp_abort (void)
 545 {
 546 }
 547
 548 static bool_t
 549 clntudp_control (CLIENT *cl, int request, char *info)
 550 {
 551   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 552
 553   switch (request)
 554     {
 555     case CLSET_FD_CLOSE:
 556       cu->cu_closeit = TRUE;
 557       break;
 558     case CLSET_FD_NCLOSE:
 559       cu->cu_closeit = FALSE;
 560       break;
 561     case CLSET_TIMEOUT:
 562       cu->cu_total = *(struct timeval *) info;
 563       break;
 564     case CLGET_TIMEOUT:
 565       *(struct timeval *) info = cu->cu_total;
 566       break;
 567     case CLSET_RETRY_TIMEOUT:
 568       cu->cu_wait = *(struct timeval *) info;
 569       break;
 570     case CLGET_RETRY_TIMEOUT:
 571       *(struct timeval *) info = cu->cu_wait;
 572       break;
 573     case CLGET_SERVER_ADDR:
 574       *(struct sockaddr_in *) info = cu->cu_raddr;
 575       break;
 576     case CLGET_FD:
 577       *(int *)info = cu->cu_sock;
 578       break;
 579     case CLGET_XID:
 580       /*
 581        * use the knowledge that xid is the
 582        * first element in the call structure *.
 583        * This will get the xid of the PREVIOUS call
 584        */
 585       *(u_long *)info = ntohl(*(u_long *)cu->cu_outbuf);
 586       break;
 587     case CLSET_XID:
 588       /* This will set the xid of the NEXT call */
 589       *(u_long *)cu->cu_outbuf =  htonl(*(u_long *)info - 1);
 590       /* decrement by 1 as clntudp_call() increments once */
 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        * begining of the RPC header. MUST be changed if the
 596        * call_struct is changed
 597        */
 598       *(u_long *)info = ntohl(*(u_long *)(cu->cu_outbuf +
 599                                           4 * BYTES_PER_XDR_UNIT));
 600       break;
 601     case CLSET_VERS:
 602       *(u_long *)(cu->cu_outbuf + 4 * BYTES_PER_XDR_UNIT)
 603         = htonl(*(u_long *)info);
 604       break;
 605     case CLGET_PROG:
 606       /*
 607        * This RELIES on the information that, in the call body,
 608        * the program number field is the  field from the
 609        * begining of the RPC header. MUST be changed if the
 610        * call_struct is changed
 611        */
 612       *(u_long *)info = ntohl(*(u_long *)(cu->cu_outbuf +
 613                                           3 * BYTES_PER_XDR_UNIT));
 614       break;
 615     case CLSET_PROG:
 616       *(u_long *)(cu->cu_outbuf + 3 * BYTES_PER_XDR_UNIT)
 617         = htonl(*(u_long *)info);
 618       break;
 619     /* The following are only possible with TI-RPC */
 620     case CLGET_SVC_ADDR:
 621     case CLSET_SVC_ADDR:
 622     case CLSET_PUSH_TIMOD:
 623     case CLSET_POP_TIMOD:
 624     default:
 625       return FALSE;
 626     }
 627   return TRUE;
 628 }
 629
 630 static void
 631 clntudp_destroy (CLIENT *cl)
 632 {
 633   struct cu_data *cu = (struct cu_data *) cl->cl_private;
 634
 635   if (cu->cu_closeit)
 636     {
 637       (void) __close (cu->cu_sock);
 638     }
 639   XDR_DESTROY (&(cu->cu_outxdrs));
 640   mem_free ((caddr_t) cu, (sizeof (*cu) + cu->cu_sendsz + cu->cu_recvsz));
 641   mem_free ((caddr_t) cl, sizeof (CLIENT));
 642 }