sunrpc/svc_udp.c

   1 /*
   2  * svc_udp.c,
   3  * Server side for UDP/IP based RPC.  (Does some caching in the hopes of
   4  * achieving execute-at-most-once semantics.)
   5  *
   6  * Copyright (C) 2012-2024 Free Software Foundation, Inc.
   7  * This file is part of the GNU C Library.
   8  *
   9  * The GNU C Library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * The GNU C Library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with the GNU C Library; if not, see
  21  * <https://www.gnu.org/licenses/>.
  22  *
  23  * Copyright (c) 2010, Oracle America, Inc.
  24  *
  25  * Redistribution and use in source and binary forms, with or without
  26  * modification, are permitted provided that the following conditions are
  27  * met:
  28  *
  29  *     * Redistributions of source code must retain the above copyright
  30  *       notice, this list of conditions and the following disclaimer.
  31  *     * Redistributions in binary form must reproduce the above
  32  *       copyright notice, this list of conditions and the following
  33  *       disclaimer in the documentation and/or other materials
  34  *       provided with the distribution.
  35  *     * Neither the name of the "Oracle America, Inc." nor the names of its
  36  *       contributors may be used to endorse or promote products derived
  37  *       from this software without specific prior written permission.
  38  *
  39  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  40  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  41  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  42  *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  43  *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  44  *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  46  *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  47  *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  48  *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  49  *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  50  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  51  */
  52
  53 #include <stdio.h>
  54 #include <unistd.h>
  55 #include <string.h>
  56 #include <rpc/rpc.h>
  57 #include <sys/socket.h>
  58 #include <errno.h>
  59 #include <libintl.h>
  60
  61 #ifdef IP_PKTINFO
  62 #include <sys/uio.h>
  63 #endif
  64
  65 #include <wchar.h>
  66 #include <libio/iolibio.h>
  67 #include <shlib-compat.h>
  68
  69 #define rpc_buffer(xprt) ((xprt)->xp_p1)
  70 #ifndef MAX
  71 #define MAX(a, b)     ((a > b) ? a : b)
  72 #endif
  73
  74 static bool_t svcudp_recv (SVCXPRT *, struct rpc_msg *);
  75 static bool_t svcudp_reply (SVCXPRT *, struct rpc_msg *);
  76 static enum xprt_stat svcudp_stat (SVCXPRT *);
  77 static bool_t svcudp_getargs (SVCXPRT *, xdrproc_t, caddr_t);
  78 static bool_t svcudp_freeargs (SVCXPRT *, xdrproc_t, caddr_t);
  79 static void svcudp_destroy (SVCXPRT *);
  80
  81 static const struct xp_ops svcudp_op =
  82 {
  83   svcudp_recv,
  84   svcudp_stat,
  85   svcudp_getargs,
  86   svcudp_reply,
  87   svcudp_freeargs,
  88   svcudp_destroy
  89 };
  90
  91 static int cache_get (SVCXPRT *, struct rpc_msg *, char **replyp,
  92                       u_long *replylenp);
  93 static void cache_set (SVCXPRT *xprt, u_long replylen);
  94
  95 /*
  96  * kept in xprt->xp_p2
  97  */
  98 struct svcudp_data
  99   {
 100     u_int su_iosz;              /* byte size of send.recv buffer */
 101     u_long su_xid;              /* transaction id */
 102     XDR su_xdrs;                /* XDR handle */
 103     char su_verfbody[MAX_AUTH_BYTES];   /* verifier body */
 104     char *su_cache;             /* cached data, NULL if no cache */
 105   };
 106 #define su_data(xprt)   ((struct svcudp_data *)(xprt->xp_p2))
 107
 108 /*
 109  * Usage:
 110  *      xprt = svcudp_create(sock);
 111  *
 112  * If sock<0 then a socket is created, else sock is used.
 113  * If the socket, sock is not bound to a port then svcudp_create
 114  * binds it to an arbitrary port.  In any (successful) case,
 115  * xprt->xp_sock is the registered socket number and xprt->xp_port is the
 116  * associated port number.
 117  * Once *xprt is initialized, it is registered as a transporter;
 118  * see (svc.h, xprt_register).
 119  * The routines returns NULL if a problem occurred.
 120  */
 121 SVCXPRT *
 122 svcudp_bufcreate (int sock, u_int sendsz, u_int recvsz)
 123 {
 124   bool_t madesock = FALSE;
 125   SVCXPRT *xprt;
 126   struct svcudp_data *su;
 127   struct sockaddr_in addr;
 128   socklen_t len = sizeof (struct sockaddr_in);
 129   int pad;
 130   void *buf;
 131
 132   if (sock == RPC_ANYSOCK)
 133     {
 134       if ((sock = __socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
 135         {
 136           perror (_("svcudp_create: socket creation problem"));
 137           return (SVCXPRT *) NULL;
 138         }
 139       madesock = TRUE;
 140     }
 141   memset ((char *) &addr, 0, sizeof (addr));
 142   addr.sin_family = AF_INET;
 143   if (bindresvport (sock, &addr))
 144     {
 145       addr.sin_port = 0;
 146       (void) __bind (sock, (struct sockaddr *) &addr, len);
 147     }
 148   if (__getsockname (sock, (struct sockaddr *) &addr, &len) != 0)
 149     {
 150       perror (_("svcudp_create - cannot getsockname"));
 151       if (madesock)
 152         (void) __close (sock);
 153       return (SVCXPRT *) NULL;
 154     }
 155   xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT));
 156   su = (struct svcudp_data *) mem_alloc (sizeof (*su));
 157   buf = mem_alloc (((MAX (sendsz, recvsz) + 3) / 4) * 4);
 158   if (xprt == NULL || su == NULL || buf == NULL)
 159     {
 160       (void) __fxprintf (NULL, "%s: %s",
 161                          "svcudp_create",  _("out of memory\n"));
 162       mem_free (xprt, sizeof (SVCXPRT));
 163       mem_free (su, sizeof (*su));
 164       mem_free (buf, ((MAX (sendsz, recvsz) + 3) / 4) * 4);
 165       return NULL;
 166     }
 167   su->su_iosz = ((MAX (sendsz, recvsz) + 3) / 4) * 4;
 168   rpc_buffer (xprt) = buf;
 169   xdrmem_create (&(su->su_xdrs), rpc_buffer (xprt), su->su_iosz, XDR_DECODE);
 170   su->su_cache = NULL;
 171   xprt->xp_p2 = (caddr_t) su;
 172   xprt->xp_verf.oa_base = su->su_verfbody;
 173   xprt->xp_ops = &svcudp_op;
 174   xprt->xp_port = ntohs (addr.sin_port);
 175   xprt->xp_sock = sock;
 176
 177 #ifdef IP_PKTINFO
 178   if ((sizeof (struct iovec) + sizeof (struct msghdr)
 179        + sizeof(struct cmsghdr) + sizeof (struct in_pktinfo))
 180       > sizeof (xprt->xp_pad))
 181     {
 182       (void) __fxprintf (NULL,"%s", _("\
 183 svcudp_create: xp_pad is too small for IP_PKTINFO\n"));
 184       return NULL;
 185     }
 186   pad = 1;
 187   if (__setsockopt (sock, SOL_IP, IP_PKTINFO, (void *) &pad,
 188                     sizeof (pad)) == 0)
 189     /* Set the padding to all 1s. */
 190     pad = 0xff;
 191   else
 192 #endif
 193     /* Clear the padding. */
 194     pad = 0;
 195   memset (&xprt->xp_pad [0], pad, sizeof (xprt->xp_pad));
 196
 197   xprt_register (xprt);
 198   return xprt;
 199 }
 200 #ifdef EXPORT_RPC_SYMBOLS
 201 libc_hidden_def (svcudp_bufcreate)
 202 #else
 203 libc_hidden_nolink_sunrpc (svcudp_bufcreate, GLIBC_2_0)
 204 #endif
 205
 206 SVCXPRT *
 207 svcudp_create (int sock)
 208 {
 209   return svcudp_bufcreate (sock, UDPMSGSIZE, UDPMSGSIZE);
 210 }
 211 #ifdef EXPORT_RPC_SYMBOLS
 212 libc_hidden_def (svcudp_create)
 213 #else
 214 libc_hidden_nolink_sunrpc (svcudp_create, GLIBC_2_0)
 215 #endif
 216
 217 static enum xprt_stat
 218 svcudp_stat (SVCXPRT *xprt)
 219 {
 220
 221   return XPRT_IDLE;
 222 }
 223
 224 static bool_t
 225 svcudp_recv (SVCXPRT *xprt, struct rpc_msg *msg)
 226 {
 227   struct svcudp_data *su = su_data (xprt);
 228   XDR *xdrs = &(su->su_xdrs);
 229   int rlen;
 230   char *reply;
 231   u_long replylen;
 232   socklen_t len;
 233
 234   /* It is very tricky when you have IP aliases. We want to make sure
 235      that we are sending the packet from the IP address where the
 236      incoming packet is addressed to. H.J. */
 237 #ifdef IP_PKTINFO
 238   struct iovec *iovp;
 239   struct msghdr *mesgp;
 240 #endif
 241
 242 again:
 243   /* FIXME -- should xp_addrlen be a size_t?  */
 244   len = (socklen_t) sizeof(struct sockaddr_in);
 245 #ifdef IP_PKTINFO
 246   iovp = (struct iovec *) &xprt->xp_pad [0];
 247   mesgp = (struct msghdr *) &xprt->xp_pad [sizeof (struct iovec)];
 248   if (mesgp->msg_iovlen)
 249     {
 250       iovp->iov_base = rpc_buffer (xprt);
 251       iovp->iov_len = su->su_iosz;
 252       mesgp->msg_iov = iovp;
 253       mesgp->msg_iovlen = 1;
 254       mesgp->msg_name = &(xprt->xp_raddr);
 255       mesgp->msg_namelen = len;
 256       mesgp->msg_control = &xprt->xp_pad [sizeof (struct iovec)
 257                                           + sizeof (struct msghdr)];
 258       mesgp->msg_controllen = sizeof(xprt->xp_pad)
 259                               - sizeof (struct iovec) - sizeof (struct msghdr);
 260       rlen = __recvmsg (xprt->xp_sock, mesgp, 0);
 261       if (rlen >= 0)
 262         {
 263           struct cmsghdr *cmsg;
 264           len = mesgp->msg_namelen;
 265           cmsg = CMSG_FIRSTHDR (mesgp);
 266           if (cmsg == NULL
 267               || CMSG_NXTHDR (mesgp, cmsg) != NULL
 268               || cmsg->cmsg_level != SOL_IP
 269               || cmsg->cmsg_type != IP_PKTINFO
 270               || cmsg->cmsg_len < (sizeof (struct cmsghdr)
 271                                    + sizeof (struct in_pktinfo)))
 272             {
 273               /* Not a simple IP_PKTINFO, ignore it.  */
 274               mesgp->msg_control = NULL;
 275               mesgp->msg_controllen = 0;
 276             }
 277           else
 278             {
 279               /* It was a simple IP_PKTIFO as we expected, discard the
 280                  interface field.  */
 281               struct in_pktinfo *pkti = (struct in_pktinfo *) CMSG_DATA (cmsg);
 282               pkti->ipi_ifindex = 0;
 283             }
 284         }
 285     }
 286   else
 287 #endif
 288     rlen = __recvfrom (xprt->xp_sock, rpc_buffer (xprt),
 289                        (int) su->su_iosz, 0,
 290                        (struct sockaddr *) &(xprt->xp_raddr), &len);
 291   xprt->xp_addrlen = len;
 292   if (rlen == -1)
 293     {
 294       if (errno == EINTR)
 295         goto again;
 296       __svc_accept_failed ();
 297     }
 298   if (rlen < 16)                /* < 4 32-bit ints? */
 299     return FALSE;
 300   xdrs->x_op = XDR_DECODE;
 301   XDR_SETPOS (xdrs, 0);
 302   if (!xdr_callmsg (xdrs, msg))
 303     return FALSE;
 304   su->su_xid = msg->rm_xid;
 305   if (su->su_cache != NULL)
 306     {
 307       if (cache_get (xprt, msg, &reply, &replylen))
 308         {
 309 #ifdef IP_PKTINFO
 310           if (mesgp->msg_iovlen)
 311             {
 312               iovp->iov_base = reply;
 313               iovp->iov_len = replylen;
 314               (void) __sendmsg (xprt->xp_sock, mesgp, 0);
 315             }
 316           else
 317 #endif
 318             (void) __sendto (xprt->xp_sock, reply, (int) replylen, 0,
 319                              (struct sockaddr *) &xprt->xp_raddr, len);
 320           return TRUE;
 321         }
 322     }
 323   return TRUE;
 324 }
 325
 326 static bool_t
 327 svcudp_reply (SVCXPRT *xprt, struct rpc_msg *msg)
 328 {
 329   struct svcudp_data *su = su_data (xprt);
 330   XDR *xdrs = &(su->su_xdrs);
 331   int slen, sent;
 332   bool_t stat = FALSE;
 333 #ifdef IP_PKTINFO
 334   struct iovec *iovp;
 335   struct msghdr *mesgp;
 336 #endif
 337
 338   xdrs->x_op = XDR_ENCODE;
 339   XDR_SETPOS (xdrs, 0);
 340   msg->rm_xid = su->su_xid;
 341   if (xdr_replymsg (xdrs, msg))
 342     {
 343       slen = (int) XDR_GETPOS (xdrs);
 344 #ifdef IP_PKTINFO
 345       mesgp = (struct msghdr *) &xprt->xp_pad [sizeof (struct iovec)];
 346       if (mesgp->msg_iovlen)
 347         {
 348           iovp = (struct iovec *) &xprt->xp_pad [0];
 349           iovp->iov_base = rpc_buffer (xprt);
 350           iovp->iov_len = slen;
 351           sent = __sendmsg (xprt->xp_sock, mesgp, 0);
 352         }
 353       else
 354 #endif
 355         sent = __sendto (xprt->xp_sock, rpc_buffer (xprt), slen, 0,
 356                          (struct sockaddr *) &(xprt->xp_raddr),
 357                          xprt->xp_addrlen);
 358       if (sent == slen)
 359         {
 360           stat = TRUE;
 361           if (su->su_cache && slen >= 0)
 362             {
 363               cache_set (xprt, (u_long) slen);
 364             }
 365         }
 366     }
 367   return stat;
 368 }
 369
 370 static bool_t
 371 svcudp_getargs (SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr)
 372 {
 373
 374   return (*xdr_args) (&(su_data (xprt)->su_xdrs), args_ptr);
 375 }
 376
 377 static bool_t
 378 svcudp_freeargs (SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr)
 379 {
 380   XDR *xdrs = &(su_data (xprt)->su_xdrs);
 381
 382   xdrs->x_op = XDR_FREE;
 383   return (*xdr_args) (xdrs, args_ptr);
 384 }
 385
 386 static void
 387 svcudp_destroy (SVCXPRT *xprt)
 388 {
 389   struct svcudp_data *su = su_data (xprt);
 390
 391   xprt_unregister (xprt);
 392   (void) __close (xprt->xp_sock);
 393   XDR_DESTROY (&(su->su_xdrs));
 394   mem_free (rpc_buffer (xprt), su->su_iosz);
 395   mem_free ((caddr_t) su, sizeof (struct svcudp_data));
 396   mem_free ((caddr_t) xprt, sizeof (SVCXPRT));
 397 }
 398
 399
 400 /***********this could be a separate file*********************/
 401
 402 /*
 403  * Fifo cache for udp server
 404  * Copies pointers to reply buffers into fifo cache
 405  * Buffers are sent again if retransmissions are detected.
 406  */
 407
 408 #define SPARSENESS 4            /* 75% sparse */
 409
 410 #define CACHE_PERROR(msg)       \
 411         (void) __fxprintf(NULL, "%s\n", msg)
 412
 413 #define ALLOC(type, size)       \
 414         (type *) mem_alloc((unsigned) (sizeof(type) * (size)))
 415
 416 #define CALLOC(type, size)      \
 417   (type *) calloc (sizeof (type), size)
 418
 419 /*
 420  * An entry in the cache
 421  */
 422 typedef struct cache_node *cache_ptr;
 423 struct cache_node
 424   {
 425     /*
 426      * Index into cache is xid, proc, vers, prog and address
 427      */
 428     u_long cache_xid;
 429     u_long cache_proc;
 430     u_long cache_vers;
 431     u_long cache_prog;
 432     struct sockaddr_in cache_addr;
 433     /*
 434      * The cached reply and length
 435      */
 436     char *cache_reply;
 437     u_long cache_replylen;
 438     /*
 439      * Next node on the list, if there is a collision
 440      */
 441     cache_ptr cache_next;
 442   };
 443
 444
 445
 446 /*
 447  * The entire cache
 448  */
 449 struct udp_cache
 450   {
 451     u_long uc_size;             /* size of cache */
 452     cache_ptr *uc_entries;      /* hash table of entries in cache */
 453     cache_ptr *uc_fifo;         /* fifo list of entries in cache */
 454     u_long uc_nextvictim;       /* points to next victim in fifo list */
 455     u_long uc_prog;             /* saved program number */
 456     u_long uc_vers;             /* saved version number */
 457     u_long uc_proc;             /* saved procedure number */
 458     struct sockaddr_in uc_addr; /* saved caller's address */
 459   };
 460
 461
 462 /*
 463  * the hashing function
 464  */
 465 #define CACHE_LOC(transp, xid)  \
 466  (xid % (SPARSENESS*((struct udp_cache *) su_data(transp)->su_cache)->uc_size))
 467
 468
 469 /*
 470  * Enable use of the cache.
 471  * Note: there is no disable.
 472  */
 473 int
 474 svcudp_enablecache (SVCXPRT *transp, u_long size)
 475 {
 476   struct svcudp_data *su = su_data (transp);
 477   struct udp_cache *uc;
 478
 479   if (su->su_cache != NULL)
 480     {
 481       CACHE_PERROR (_("enablecache: cache already enabled"));
 482       return 0;
 483     }
 484   uc = ALLOC (struct udp_cache, 1);
 485   if (uc == NULL)
 486     {
 487       CACHE_PERROR (_("enablecache: could not allocate cache"));
 488       return 0;
 489     }
 490   uc->uc_size = size;
 491   uc->uc_nextvictim = 0;
 492   uc->uc_entries = CALLOC (cache_ptr, size * SPARSENESS);
 493   if (uc->uc_entries == NULL)
 494     {
 495       mem_free (uc, sizeof (struct udp_cache));
 496       CACHE_PERROR (_("enablecache: could not allocate cache data"));
 497       return 0;
 498     }
 499   uc->uc_fifo = CALLOC (cache_ptr, size);
 500   if (uc->uc_fifo == NULL)
 501     {
 502       mem_free (uc->uc_entries, size * SPARSENESS);
 503       mem_free (uc, sizeof (struct udp_cache));
 504       CACHE_PERROR (_("enablecache: could not allocate cache fifo"));
 505       return 0;
 506     }
 507   su->su_cache = (char *) uc;
 508   return 1;
 509 }
 510 libc_hidden_nolink_sunrpc (svcudp_enablecache, GLIBC_2_0)
 511
 512
 513 /*
 514  * Set an entry in the cache
 515  */
 516 static void
 517 cache_set (SVCXPRT *xprt, u_long replylen)
 518 {
 519   cache_ptr victim;
 520   cache_ptr *vicp;
 521   struct svcudp_data *su = su_data (xprt);
 522   struct udp_cache *uc = (struct udp_cache *) su->su_cache;
 523   u_int loc;
 524   char *newbuf;
 525
 526   /*
 527    * Find space for the new entry, either by
 528    * reusing an old entry, or by mallocing a new one
 529    */
 530   victim = uc->uc_fifo[uc->uc_nextvictim];
 531   if (victim != NULL)
 532     {
 533       loc = CACHE_LOC (xprt, victim->cache_xid);
 534       for (vicp = &uc->uc_entries[loc];
 535            *vicp != NULL && *vicp != victim;
 536            vicp = &(*vicp)->cache_next)
 537         ;
 538       if (*vicp == NULL)
 539         {
 540           CACHE_PERROR (_("cache_set: victim not found"));
 541           return;
 542         }
 543       *vicp = victim->cache_next;       /* remote from cache */
 544       newbuf = victim->cache_reply;
 545     }
 546   else
 547     {
 548       victim = ALLOC (struct cache_node, 1);
 549       if (victim == NULL)
 550         {
 551           CACHE_PERROR (_("cache_set: victim alloc failed"));
 552           return;
 553         }
 554       newbuf = mem_alloc (su->su_iosz);
 555       if (newbuf == NULL)
 556         {
 557           mem_free (victim, sizeof (struct cache_node));
 558           CACHE_PERROR (_("cache_set: could not allocate new rpc_buffer"));
 559           return;
 560         }
 561     }
 562
 563   /*
 564    * Store it away
 565    */
 566   victim->cache_replylen = replylen;
 567   victim->cache_reply = rpc_buffer (xprt);
 568   rpc_buffer (xprt) = newbuf;
 569   xdrmem_create (&(su->su_xdrs), rpc_buffer (xprt), su->su_iosz, XDR_ENCODE);
 570   victim->cache_xid = su->su_xid;
 571   victim->cache_proc = uc->uc_proc;
 572   victim->cache_vers = uc->uc_vers;
 573   victim->cache_prog = uc->uc_prog;
 574   victim->cache_addr = uc->uc_addr;
 575   loc = CACHE_LOC (xprt, victim->cache_xid);
 576   victim->cache_next = uc->uc_entries[loc];
 577   uc->uc_entries[loc] = victim;
 578   uc->uc_fifo[uc->uc_nextvictim++] = victim;
 579   uc->uc_nextvictim %= uc->uc_size;
 580 }
 581
 582 /*
 583  * Try to get an entry from the cache
 584  * return 1 if found, 0 if not found
 585  */
 586 static int
 587 cache_get (SVCXPRT *xprt, struct rpc_msg *msg, char **replyp,
 588            u_long *replylenp)
 589 {
 590   u_int loc;
 591   cache_ptr ent;
 592   struct svcudp_data *su = su_data (xprt);
 593   struct udp_cache *uc = (struct udp_cache *) su->su_cache;
 594
 595 #define EQADDR(a1, a2)  (memcmp((char*)&a1, (char*)&a2, sizeof(a1)) == 0)
 596
 597   loc = CACHE_LOC (xprt, su->su_xid);
 598   for (ent = uc->uc_entries[loc]; ent != NULL; ent = ent->cache_next)
 599     {
 600       if (ent->cache_xid == su->su_xid &&
 601           ent->cache_proc == uc->uc_proc &&
 602           ent->cache_vers == uc->uc_vers &&
 603           ent->cache_prog == uc->uc_prog &&
 604           EQADDR (ent->cache_addr, uc->uc_addr))
 605         {
 606           *replyp = ent->cache_reply;
 607           *replylenp = ent->cache_replylen;
 608           return 1;
 609         }
 610     }
 611   /*
 612    * Failed to find entry
 613    * Remember a few things so we can do a set later
 614    */
 615   uc->uc_proc = msg->rm_call.cb_proc;
 616   uc->uc_vers = msg->rm_call.cb_vers;
 617   uc->uc_prog = msg->rm_call.cb_prog;
 618   memcpy (&uc->uc_addr, &xprt->xp_raddr, sizeof (uc->uc_addr));
 619   return 0;
 620 }