lib/libc/rpc/svc_dg.c

   1 /*      $NetBSD: svc_dg.c,v 1.12 2008/04/25 17:44:44 christos Exp $     */
   2
   3 /*
   4  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   5  * unrestricted use provided that this legend is included on all tape
   6  * media and as a part of the software program in whole or part.  Users
   7  * may copy or modify Sun RPC without charge, but are not authorized
   8  * to license or distribute it to anyone else except as part of a product or
   9  * program developed by the user.
  10  *
  11  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  12  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  13  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  14  *
  15  * Sun RPC is provided with no support and without any obligation on the
  16  * part of Sun Microsystems, Inc. to assist in its use, correction,
  17  * modification or enhancement.
  18  *
  19  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  20  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  21  * OR ANY PART THEREOF.
  22  *
  23  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  24  * or profits or other special, indirect and consequential damages, even if
  25  * Sun has been advised of the possibility of such damages.
  26  *
  27  * Sun Microsystems, Inc.
  28  * 2550 Garcia Avenue
  29  * Mountain View, California  94043
  30  */
  31
  32 /*
  33  * Copyright (c) 1986-1991 by Sun Microsystems Inc.
  34  */
  35
  36 /* #ident       "@(#)svc_dg.c   1.17    94/04/24 SMI" */
  37
  38
  39 /*
  40  * svc_dg.c, Server side for connectionless RPC.
  41  *
  42  * Does some caching in the hopes of achieving execute-at-most-once semantics.
  43  */
  44
  45 #include <sys/cdefs.h>
  46 #if defined(LIBC_SCCS) && !defined(lint)
  47 __RCSID("$NetBSD: svc_dg.c,v 1.12 2008/04/25 17:44:44 christos Exp $");
  48 #endif
  49
  50 #include "namespace.h"
  51 #include "reentrant.h"
  52 #include <sys/types.h>
  53 #include <sys/socket.h>
  54 #include <rpc/rpc.h>
  55 #include <assert.h>
  56 #include <errno.h>
  57 #include <unistd.h>
  58 #include <stdio.h>
  59 #include <stdlib.h>
  60 #include <string.h>
  61 #ifdef RPC_CACHE_DEBUG
  62 #include <netconfig.h>
  63 #include <netdir.h>
  64 #endif
  65 #include <err.h>
  66
  67 #include "rpc_internal.h"
  68 #include "svc_dg.h"
  69
  70 #define su_data(xprt)   ((struct svc_dg_data *)(xprt->xp_p2))
  71 #define rpc_buffer(xprt) ((xprt)->xp_p1)
  72
  73 #ifdef __weak_alias
  74 __weak_alias(svc_dg_create,_svc_dg_create)
  75 #endif
  76
  77 #ifndef MAX
  78 #define MAX(a, b)       (((a) > (b)) ? (a) : (b))
  79 #endif
  80
  81 static void svc_dg_ops __P((SVCXPRT *));
  82 static enum xprt_stat svc_dg_stat __P((SVCXPRT *));
  83 static bool_t svc_dg_recv __P((SVCXPRT *, struct rpc_msg *));
  84 static bool_t svc_dg_reply __P((SVCXPRT *, struct rpc_msg *));
  85 static bool_t svc_dg_getargs __P((SVCXPRT *, xdrproc_t, caddr_t));
  86 static bool_t svc_dg_freeargs __P((SVCXPRT *, xdrproc_t, caddr_t));
  87 static void svc_dg_destroy __P((SVCXPRT *));
  88 static bool_t svc_dg_control __P((SVCXPRT *, const u_int, void *));
  89 static int cache_get __P((SVCXPRT *, struct rpc_msg *, char **, size_t *));
  90 static void cache_set __P((SVCXPRT *, size_t));
  91
  92 /*
  93  * Usage:
  94  *      xprt = svc_dg_create(sock, sendsize, recvsize);
  95  * Does other connectionless specific initializations.
  96  * Once *xprt is initialized, it is registered.
  97  * see (svc.h, xprt_register). If recvsize or sendsize are 0 suitable
  98  * system defaults are chosen.
  99  * The routines returns NULL if a problem occurred.
 100  */
 101 static const char svc_dg_str[] = "svc_dg_create: %s";
 102 static const char svc_dg_err1[] = "could not get transport information";
 103 static const char svc_dg_err2[] = " transport does not support data transfer";
 104 static const char __no_mem_str[] = "out of memory";
 105
 106 SVCXPRT *
 107 svc_dg_create(fd, sendsize, recvsize)
 108         int fd;
 109         u_int sendsize;
 110         u_int recvsize;
 111 {
 112         SVCXPRT *xprt;
 113         struct svc_dg_data *su = NULL;
 114         struct __rpc_sockinfo si;
 115         struct sockaddr_storage ss;
 116         socklen_t slen;
 117
 118         if (!__rpc_fd2sockinfo(fd, &si)) {
 119                 warnx(svc_dg_str, svc_dg_err1);
 120                 return (NULL);
 121         }
 122         /*
 123          * Find the receive and the send size
 124          */
 125         sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize);
 126         recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize);
 127         if ((sendsize == 0) || (recvsize == 0)) {
 128                 warnx(svc_dg_str, svc_dg_err2);
 129                 return (NULL);
 130         }
 131
 132         xprt = mem_alloc(sizeof (SVCXPRT));
 133         if (xprt == NULL)
 134                 goto freedata;
 135         memset(xprt, 0, sizeof (SVCXPRT));
 136
 137         su = mem_alloc(sizeof (*su));
 138         if (su == NULL)
 139                 goto freedata;
 140         su->su_iosz = ((MAX(sendsize, recvsize) + 3) / 4) * 4;
 141         if ((rpc_buffer(xprt) = malloc(su->su_iosz)) == NULL)
 142                 goto freedata;
 143         xdrmem_create(&(su->su_xdrs), rpc_buffer(xprt), su->su_iosz,
 144                 XDR_DECODE);
 145         su->su_cache = NULL;
 146         xprt->xp_fd = fd;
 147         xprt->xp_p2 = (caddr_t)(void *)su;
 148         xprt->xp_verf.oa_base = su->su_verfbody;
 149         svc_dg_ops(xprt);
 150         xprt->xp_rtaddr.maxlen = sizeof (struct sockaddr_storage);
 151
 152         slen = sizeof ss;
 153         if (getsockname(fd, (struct sockaddr *)(void *)&ss, &slen) < 0)
 154                 goto freedata;
 155         xprt->xp_ltaddr.buf = mem_alloc(sizeof (struct sockaddr_storage));
 156         xprt->xp_ltaddr.maxlen = sizeof (struct sockaddr_storage);
 157         xprt->xp_ltaddr.len = slen;
 158         memcpy(xprt->xp_ltaddr.buf, &ss, slen);
 159
 160         xprt_register(xprt);
 161         return (xprt);
 162 freedata:
 163         (void) warnx(svc_dg_str, __no_mem_str);
 164         if (xprt) {
 165                 if (su)
 166                         (void) mem_free(su, sizeof (*su));
 167                 (void) mem_free(xprt, sizeof (SVCXPRT));
 168         }
 169         return (NULL);
 170 }
 171
 172 /*ARGSUSED*/
 173 static enum xprt_stat
 174 svc_dg_stat(xprt)
 175         SVCXPRT *xprt;
 176 {
 177         return (XPRT_IDLE);
 178 }
 179
 180 static bool_t
 181 svc_dg_recv(xprt, msg)
 182         SVCXPRT *xprt;
 183         struct rpc_msg *msg;
 184 {
 185         struct svc_dg_data *su;
 186         XDR *xdrs;
 187         char *reply;
 188         struct sockaddr_storage ss;
 189         socklen_t alen;
 190         size_t replylen;
 191         ssize_t rlen;
 192
 193         _DIAGASSERT(xprt != NULL);
 194         _DIAGASSERT(msg != NULL);
 195
 196         su = su_data(xprt);
 197         xdrs = &(su->su_xdrs);
 198
 199 again:
 200         alen = sizeof (struct sockaddr_storage);
 201         rlen = recvfrom(xprt->xp_fd, rpc_buffer(xprt), su->su_iosz, 0,
 202             (struct sockaddr *)(void *)&ss, &alen);
 203         if (rlen == -1 && errno == EINTR)
 204                 goto again;
 205         if (rlen == -1 || (rlen < (ssize_t)(4 * sizeof (u_int32_t))))
 206                 return (FALSE);
 207         if (xprt->xp_rtaddr.len < alen) {
 208                 if (xprt->xp_rtaddr.len != 0)
 209                         mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.len);
 210                 xprt->xp_rtaddr.buf = mem_alloc(alen);
 211                 xprt->xp_rtaddr.len = alen;
 212         }
 213         memcpy(xprt->xp_rtaddr.buf, &ss, alen);
 214 #ifdef PORTMAP
 215         if (ss.ss_family == AF_INET) {
 216                 xprt->xp_raddr = *(struct sockaddr_in *)xprt->xp_rtaddr.buf;
 217                 xprt->xp_addrlen = sizeof (struct sockaddr_in);
 218         }
 219 #endif
 220         xdrs->x_op = XDR_DECODE;
 221         XDR_SETPOS(xdrs, 0);
 222         if (! xdr_callmsg(xdrs, msg)) {
 223                 return (FALSE);
 224         }
 225         su->su_xid = msg->rm_xid;
 226         if (su->su_cache != NULL) {
 227                 if (cache_get(xprt, msg, &reply, &replylen)) {
 228                         (void)sendto(xprt->xp_fd, reply, replylen, 0,
 229                             (struct sockaddr *)(void *)&ss, alen);
 230                         return (FALSE);
 231                 }
 232         }
 233         return (TRUE);
 234 }
 235
 236 static bool_t
 237 svc_dg_reply(xprt, msg)
 238         SVCXPRT *xprt;
 239         struct rpc_msg *msg;
 240 {
 241         struct svc_dg_data *su;
 242         XDR *xdrs;
 243         bool_t stat = FALSE;
 244         size_t slen;
 245
 246         _DIAGASSERT(xprt != NULL);
 247         _DIAGASSERT(msg != NULL);
 248
 249         su = su_data(xprt);
 250         xdrs = &(su->su_xdrs);
 251
 252         xdrs->x_op = XDR_ENCODE;
 253         XDR_SETPOS(xdrs, 0);
 254         msg->rm_xid = su->su_xid;
 255         if (xdr_replymsg(xdrs, msg)) {
 256                 slen = XDR_GETPOS(xdrs);
 257                 if (sendto(xprt->xp_fd, rpc_buffer(xprt), slen, 0,
 258                     (struct sockaddr *)xprt->xp_rtaddr.buf,
 259                     (socklen_t)xprt->xp_rtaddr.len) == (ssize_t) slen) {
 260                         stat = TRUE;
 261                         if (su->su_cache)
 262                                 cache_set(xprt, slen);
 263                 }
 264         }
 265         return (stat);
 266 }
 267
 268 static bool_t
 269 svc_dg_getargs(xprt, xdr_args, args_ptr)
 270         SVCXPRT *xprt;
 271         xdrproc_t xdr_args;
 272         caddr_t args_ptr;
 273 {
 274         return (*xdr_args)(&(su_data(xprt)->su_xdrs), args_ptr);
 275 }
 276
 277 static bool_t
 278 svc_dg_freeargs(xprt, xdr_args, args_ptr)
 279         SVCXPRT *xprt;
 280         xdrproc_t xdr_args;
 281         caddr_t args_ptr;
 282 {
 283         XDR *xdrs;
 284
 285         _DIAGASSERT(xprt != NULL);
 286
 287         xdrs = &(su_data(xprt)->su_xdrs);
 288         xdrs->x_op = XDR_FREE;
 289         return (*xdr_args)(xdrs, args_ptr);
 290 }
 291
 292 static void
 293 svc_dg_destroy(xprt)
 294         SVCXPRT *xprt;
 295 {
 296         struct svc_dg_data *su;
 297
 298         _DIAGASSERT(xprt != NULL);
 299
 300         su = su_data(xprt);
 301
 302         xprt_unregister(xprt);
 303         if (xprt->xp_fd != -1)
 304                 (void)close(xprt->xp_fd);
 305         XDR_DESTROY(&(su->su_xdrs));
 306         (void) mem_free(rpc_buffer(xprt), su->su_iosz);
 307         (void) mem_free(su, sizeof (*su));
 308         if (xprt->xp_rtaddr.buf)
 309                 (void) mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.maxlen);
 310         if (xprt->xp_ltaddr.buf)
 311                 (void) mem_free(xprt->xp_ltaddr.buf, xprt->xp_ltaddr.maxlen);
 312         if (xprt->xp_tp)
 313                 (void) free(xprt->xp_tp);
 314         (void) mem_free(xprt, sizeof (SVCXPRT));
 315 }
 316
 317 static bool_t
 318 /*ARGSUSED*/
 319 svc_dg_control(xprt, rq, in)
 320         SVCXPRT *xprt;
 321         const u_int     rq;
 322         void            *in;
 323 {
 324         return (FALSE);
 325 }
 326
 327 static void
 328 svc_dg_ops(xprt)
 329         SVCXPRT *xprt;
 330 {
 331         static struct xp_ops ops;
 332         static struct xp_ops2 ops2;
 333 #ifdef _REENTRANT
 334         extern mutex_t ops_lock;
 335 #endif
 336
 337         _DIAGASSERT(xprt != NULL);
 338
 339 /* VARIABLES PROTECTED BY ops_lock: ops */
 340
 341         mutex_lock(&ops_lock);
 342         if (ops.xp_recv == NULL) {
 343                 ops.xp_recv = svc_dg_recv;
 344                 ops.xp_stat = svc_dg_stat;
 345                 ops.xp_getargs = svc_dg_getargs;
 346                 ops.xp_reply = svc_dg_reply;
 347                 ops.xp_freeargs = svc_dg_freeargs;
 348                 ops.xp_destroy = svc_dg_destroy;
 349                 ops2.xp_control = svc_dg_control;
 350         }
 351         xprt->xp_ops = &ops;
 352         xprt->xp_ops2 = &ops2;
 353         mutex_unlock(&ops_lock);
 354 }
 355
 356 /*  The CACHING COMPONENT */
 357
 358 /*
 359  * Could have been a separate file, but some part of it depends upon the
 360  * private structure of the client handle.
 361  *
 362  * Fifo cache for cl server
 363  * Copies pointers to reply buffers into fifo cache
 364  * Buffers are sent again if retransmissions are detected.
 365  */
 366
 367 #define SPARSENESS 4    /* 75% sparse */
 368
 369 #define ALLOC(type, size)       \
 370         mem_alloc((sizeof (type) * (size)))
 371
 372 #define MEMZERO(addr, type, size)        \
 373         (void) memset((void *) (addr), 0, sizeof (type) * (int) (size))
 374
 375 #define FREE(addr, type, size)  \
 376         mem_free((addr), (sizeof (type) * (size)))
 377
 378 /*
 379  * An entry in the cache
 380  */
 381 typedef struct cache_node *cache_ptr;
 382 struct cache_node {
 383         /*
 384          * Index into cache is xid, proc, vers, prog and address
 385          */
 386         u_int32_t cache_xid;
 387         rpcproc_t cache_proc;
 388         rpcvers_t cache_vers;
 389         rpcprog_t cache_prog;
 390         struct netbuf cache_addr;
 391         /*
 392          * The cached reply and length
 393          */
 394         char *cache_reply;
 395         size_t cache_replylen;
 396         /*
 397          * Next node on the list, if there is a collision
 398          */
 399         cache_ptr cache_next;
 400 };
 401
 402 /*
 403  * The entire cache
 404  */
 405 struct cl_cache {
 406         u_int uc_size;          /* size of cache */
 407         cache_ptr *uc_entries;  /* hash table of entries in cache */
 408         cache_ptr *uc_fifo;     /* fifo list of entries in cache */
 409         u_int uc_nextvictim;    /* points to next victim in fifo list */
 410         rpcprog_t uc_prog;      /* saved program number */
 411         rpcvers_t uc_vers;      /* saved version number */
 412         rpcproc_t uc_proc;      /* saved procedure number */
 413 };
 414
 415
 416 /*
 417  * the hashing function
 418  */
 419 #define CACHE_LOC(transp, xid)  \
 420         (xid % (SPARSENESS * ((struct cl_cache *) \
 421                 su_data(transp)->su_cache)->uc_size))
 422
 423 #ifdef _REENTRANT
 424 extern mutex_t  dupreq_lock;
 425 #endif
 426
 427 /*
 428  * Enable use of the cache. Returns 1 on success, 0 on failure.
 429  * Note: there is no disable.
 430  */
 431 static const char cache_enable_str[] = "svc_enablecache: %s %s";
 432 static const char alloc_err[] = "could not allocate cache ";
 433 static const char enable_err[] = "cache already enabled";
 434
 435 int
 436 svc_dg_enablecache(transp, size)
 437         SVCXPRT *transp;
 438         u_int size;
 439 {
 440         struct svc_dg_data *su;
 441         struct cl_cache *uc;
 442
 443         _DIAGASSERT(transp != NULL);
 444
 445         su = su_data(transp);
 446
 447         mutex_lock(&dupreq_lock);
 448         if (su->su_cache != NULL) {
 449                 (void) warnx(cache_enable_str, enable_err, " ");
 450                 mutex_unlock(&dupreq_lock);
 451                 return (0);
 452         }
 453         uc = ALLOC(struct cl_cache, 1);
 454         if (uc == NULL) {
 455                 warnx(cache_enable_str, alloc_err, " ");
 456                 mutex_unlock(&dupreq_lock);
 457                 return (0);
 458         }
 459         uc->uc_size = size;
 460         uc->uc_nextvictim = 0;
 461         uc->uc_entries = ALLOC(cache_ptr, size * SPARSENESS);
 462         if (uc->uc_entries == NULL) {
 463                 warnx(cache_enable_str, alloc_err, "data");
 464                 FREE(uc, struct cl_cache, 1);
 465                 mutex_unlock(&dupreq_lock);
 466                 return (0);
 467         }
 468         MEMZERO(uc->uc_entries, cache_ptr, size * SPARSENESS);
 469         uc->uc_fifo = ALLOC(cache_ptr, size);
 470         if (uc->uc_fifo == NULL) {
 471                 warnx(cache_enable_str, alloc_err, "fifo");
 472                 FREE(uc->uc_entries, cache_ptr, size * SPARSENESS);
 473                 FREE(uc, struct cl_cache, 1);
 474                 mutex_unlock(&dupreq_lock);
 475                 return (0);
 476         }
 477         MEMZERO(uc->uc_fifo, cache_ptr, size);
 478         su->su_cache = (char *)(void *)uc;
 479         mutex_unlock(&dupreq_lock);
 480         return (1);
 481 }
 482
 483 /*
 484  * Set an entry in the cache.  It assumes that the uc entry is set from
 485  * the earlier call to cache_get() for the same procedure.  This will always
 486  * happen because cache_get() is calle by svc_dg_recv and cache_set() is called
 487  * by svc_dg_reply().  All this hoopla because the right RPC parameters are
 488  * not available at svc_dg_reply time.
 489  */
 490
 491 static const char cache_set_str[] = "cache_set: %s";
 492 static const char cache_set_err1[] = "victim not found";
 493 static const char cache_set_err2[] = "victim alloc failed";
 494 static const char cache_set_err3[] = "could not allocate new rpc buffer";
 495
 496 static void
 497 cache_set(xprt, replylen)
 498         SVCXPRT *xprt;
 499         size_t replylen;
 500 {
 501         cache_ptr victim;
 502         cache_ptr *vicp;
 503         struct svc_dg_data *su;
 504         struct cl_cache *uc;
 505         u_int loc;
 506         char *newbuf;
 507 #ifdef RPC_CACHE_DEBUG
 508         struct netconfig *nconf;
 509         char *uaddr;
 510 #endif
 511
 512         _DIAGASSERT(xprt != NULL);
 513
 514         su = su_data(xprt);
 515         uc = (struct cl_cache *) su->su_cache;
 516
 517         mutex_lock(&dupreq_lock);
 518         /*
 519          * Find space for the new entry, either by
 520          * reusing an old entry, or by mallocing a new one
 521          */
 522         victim = uc->uc_fifo[uc->uc_nextvictim];
 523         if (victim != NULL) {
 524                 loc = CACHE_LOC(xprt, victim->cache_xid);
 525                 for (vicp = &uc->uc_entries[loc];
 526                         *vicp != NULL && *vicp != victim;
 527                         vicp = &(*vicp)->cache_next)
 528                         ;
 529                 if (*vicp == NULL) {
 530                         warnx(cache_set_str, cache_set_err1);
 531                         mutex_unlock(&dupreq_lock);
 532                         return;
 533                 }
 534                 *vicp = victim->cache_next;     /* remove from cache */
 535                 newbuf = victim->cache_reply;
 536         } else {
 537                 victim = ALLOC(struct cache_node, 1);
 538                 if (victim == NULL) {
 539                         warnx(cache_set_str, cache_set_err2);
 540                         mutex_unlock(&dupreq_lock);
 541                         return;
 542                 }
 543                 newbuf = mem_alloc(su->su_iosz);
 544                 if (newbuf == NULL) {
 545                         warnx(cache_set_str, cache_set_err3);
 546                         FREE(victim, struct cache_node, 1);
 547                         mutex_unlock(&dupreq_lock);
 548                         return;
 549                 }
 550         }
 551
 552         /*
 553          * Store it away
 554          */
 555 #ifdef RPC_CACHE_DEBUG
 556         if (nconf = getnetconfigent(xprt->xp_netid)) {
 557                 uaddr = taddr2uaddr(nconf, &xprt->xp_rtaddr);
 558                 freenetconfigent(nconf);
 559                 printf(
 560         "cache set for xid= %x prog=%d vers=%d proc=%d for rmtaddr=%s\n",
 561                         su->su_xid, uc->uc_prog, uc->uc_vers,
 562                         uc->uc_proc, uaddr);
 563                 free(uaddr);
 564         }
 565 #endif
 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),
 570                         su->su_iosz, XDR_ENCODE);
 571         victim->cache_xid = su->su_xid;
 572         victim->cache_proc = uc->uc_proc;
 573         victim->cache_vers = uc->uc_vers;
 574         victim->cache_prog = uc->uc_prog;
 575         victim->cache_addr = xprt->xp_rtaddr;
 576         victim->cache_addr.buf = ALLOC(char, xprt->xp_rtaddr.len);
 577         (void) memcpy(victim->cache_addr.buf, xprt->xp_rtaddr.buf,
 578             (size_t)xprt->xp_rtaddr.len);
 579         loc = CACHE_LOC(xprt, victim->cache_xid);
 580         victim->cache_next = uc->uc_entries[loc];
 581         uc->uc_entries[loc] = victim;
 582         uc->uc_fifo[uc->uc_nextvictim++] = victim;
 583         uc->uc_nextvictim %= uc->uc_size;
 584         mutex_unlock(&dupreq_lock);
 585 }
 586
 587 /*
 588  * Try to get an entry from the cache
 589  * return 1 if found, 0 if not found and set the stage for cache_set()
 590  */
 591 static int
 592 cache_get(xprt, msg, replyp, replylenp)
 593         SVCXPRT *xprt;
 594         struct rpc_msg *msg;
 595         char **replyp;
 596         size_t *replylenp;
 597 {
 598         u_int loc;
 599         cache_ptr ent;
 600         struct svc_dg_data *su;
 601         struct cl_cache *uc;
 602 #ifdef RPC_CACHE_DEBUG
 603         struct netconfig *nconf;
 604         char *uaddr;
 605 #endif
 606
 607         _DIAGASSERT(xprt != NULL);
 608         _DIAGASSERT(msg != NULL);
 609         _DIAGASSERT(replyp != NULL);
 610         _DIAGASSERT(replylenp != NULL);
 611
 612         su = su_data(xprt);
 613         uc = (struct cl_cache *) su->su_cache;
 614
 615         mutex_lock(&dupreq_lock);
 616         loc = CACHE_LOC(xprt, su->su_xid);
 617         for (ent = uc->uc_entries[loc]; ent != NULL; ent = ent->cache_next) {
 618                 if (ent->cache_xid == su->su_xid &&
 619                         ent->cache_proc == msg->rm_call.cb_proc &&
 620                         ent->cache_vers == msg->rm_call.cb_vers &&
 621                         ent->cache_prog == msg->rm_call.cb_prog &&
 622                         ent->cache_addr.len == xprt->xp_rtaddr.len &&
 623                         (memcmp(ent->cache_addr.buf, xprt->xp_rtaddr.buf,
 624                                 xprt->xp_rtaddr.len) == 0)) {
 625 #ifdef RPC_CACHE_DEBUG
 626                         if (nconf = getnetconfigent(xprt->xp_netid)) {
 627                                 uaddr = taddr2uaddr(nconf, &xprt->xp_rtaddr);
 628                                 freenetconfigent(nconf);
 629                                 printf(
 630         "cache entry found for xid=%x prog=%d vers=%d proc=%d for rmtaddr=%s\n",
 631                                         su->su_xid, msg->rm_call.cb_prog,
 632                                         msg->rm_call.cb_vers,
 633                                         msg->rm_call.cb_proc, uaddr);
 634                                 free(uaddr);
 635                         }
 636 #endif
 637                         *replyp = ent->cache_reply;
 638                         *replylenp = ent->cache_replylen;
 639                         mutex_unlock(&dupreq_lock);
 640                         return (1);
 641                 }
 642         }
 643         /*
 644          * Failed to find entry
 645          * Remember a few things so we can do a set later
 646          */
 647         uc->uc_proc = msg->rm_call.cb_proc;
 648         uc->uc_vers = msg->rm_call.cb_vers;
 649         uc->uc_prog = msg->rm_call.cb_prog;
 650         mutex_unlock(&dupreq_lock);
 651         return (0);
 652 }