lib/libc/rpc/svc_dg.c

   1 /*      $NetBSD: svc_dg.c,v 1.14 2012/03/20 17:14:50 matt 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 1.14 2012/03/20 17:14:50 matt 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(SVCXPRT *);
  82 static enum xprt_stat svc_dg_stat(SVCXPRT *);
  83 static bool_t svc_dg_recv(SVCXPRT *, struct rpc_msg *);
  84 static bool_t svc_dg_reply(SVCXPRT *, struct rpc_msg *);
  85 static bool_t svc_dg_getargs(SVCXPRT *, xdrproc_t, caddr_t);
  86 static bool_t svc_dg_freeargs(SVCXPRT *, xdrproc_t, caddr_t);
  87 static void svc_dg_destroy(SVCXPRT *);
  88 static bool_t svc_dg_control(SVCXPRT *, const u_int, void *);
  89 static int cache_get(SVCXPRT *, struct rpc_msg *, char **, size_t *);
  90 static void cache_set(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(int fd, u_int sendsize, u_int recvsize)
 108 {
 109         SVCXPRT *xprt;
 110         struct svc_dg_data *su = NULL;
 111         struct __rpc_sockinfo si;
 112         struct sockaddr_storage ss;
 113         socklen_t slen;
 114
 115         if (!__rpc_fd2sockinfo(fd, &si)) {
 116                 warnx(svc_dg_str, svc_dg_err1);
 117                 return (NULL);
 118         }
 119         /*
 120          * Find the receive and the send size
 121          */
 122         sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize);
 123         recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize);
 124         if ((sendsize == 0) || (recvsize == 0)) {
 125                 warnx(svc_dg_str, svc_dg_err2);
 126                 return (NULL);
 127         }
 128
 129         xprt = mem_alloc(sizeof (SVCXPRT));
 130         if (xprt == NULL)
 131                 goto freedata;
 132         memset(xprt, 0, sizeof (SVCXPRT));
 133
 134         su = mem_alloc(sizeof (*su));
 135         if (su == NULL)
 136                 goto freedata;
 137         su->su_iosz = ((MAX(sendsize, recvsize) + 3) / 4) * 4;
 138         if ((rpc_buffer(xprt) = malloc(su->su_iosz)) == NULL)
 139                 goto freedata;
 140         _DIAGASSERT(__type_fit(u_int, su->su_iosz));
 141         xdrmem_create(&(su->su_xdrs), rpc_buffer(xprt), (u_int)su->su_iosz,
 142                 XDR_DECODE);
 143         su->su_cache = NULL;
 144         xprt->xp_fd = fd;
 145         xprt->xp_p2 = (caddr_t)(void *)su;
 146         xprt->xp_verf.oa_base = su->su_verfbody;
 147         svc_dg_ops(xprt);
 148         xprt->xp_rtaddr.maxlen = sizeof (struct sockaddr_storage);
 149
 150         slen = sizeof ss;
 151         if (getsockname(fd, (struct sockaddr *)(void *)&ss, &slen) < 0)
 152                 goto freedata;
 153         xprt->xp_ltaddr.buf = mem_alloc(sizeof (struct sockaddr_storage));
 154         xprt->xp_ltaddr.maxlen = sizeof (struct sockaddr_storage);
 155         xprt->xp_ltaddr.len = slen;
 156         memcpy(xprt->xp_ltaddr.buf, &ss, slen);
 157
 158         xprt_register(xprt);
 159         return (xprt);
 160 freedata:
 161         (void) warnx(svc_dg_str, __no_mem_str);
 162         if (xprt) {
 163                 if (su)
 164                         (void) mem_free(su, sizeof (*su));
 165                 (void) mem_free(xprt, sizeof (SVCXPRT));
 166         }
 167         return (NULL);
 168 }
 169
 170 /*ARGSUSED*/
 171 static enum xprt_stat
 172 svc_dg_stat(SVCXPRT *xprt)
 173 {
 174         return (XPRT_IDLE);
 175 }
 176
 177 static bool_t
 178 svc_dg_recv(SVCXPRT *xprt, struct rpc_msg *msg)
 179 {
 180         struct svc_dg_data *su;
 181         XDR *xdrs;
 182         char *reply;
 183         struct sockaddr_storage ss;
 184         socklen_t alen;
 185         size_t replylen;
 186         ssize_t rlen;
 187
 188         _DIAGASSERT(xprt != NULL);
 189         _DIAGASSERT(msg != NULL);
 190
 191         su = su_data(xprt);
 192         xdrs = &(su->su_xdrs);
 193
 194 again:
 195         alen = sizeof (struct sockaddr_storage);
 196         rlen = recvfrom(xprt->xp_fd, rpc_buffer(xprt), su->su_iosz, 0,
 197             (struct sockaddr *)(void *)&ss, &alen);
 198         if (rlen == -1 && errno == EINTR)
 199                 goto again;
 200         if (rlen == -1 || (rlen < (ssize_t)(4 * sizeof (u_int32_t))))
 201                 return (FALSE);
 202         if (xprt->xp_rtaddr.len < alen) {
 203                 if (xprt->xp_rtaddr.len != 0)
 204                         mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.len);
 205                 xprt->xp_rtaddr.buf = mem_alloc(alen);
 206                 xprt->xp_rtaddr.len = alen;
 207         }
 208         memcpy(xprt->xp_rtaddr.buf, &ss, alen);
 209 #ifdef PORTMAP
 210         if (ss.ss_family == AF_INET) {
 211                 xprt->xp_raddr = *(struct sockaddr_in *)xprt->xp_rtaddr.buf;
 212                 xprt->xp_addrlen = sizeof (struct sockaddr_in);
 213         }
 214 #endif
 215         xdrs->x_op = XDR_DECODE;
 216         XDR_SETPOS(xdrs, 0);
 217         if (! xdr_callmsg(xdrs, msg)) {
 218                 return (FALSE);
 219         }
 220         su->su_xid = msg->rm_xid;
 221         if (su->su_cache != NULL) {
 222                 if (cache_get(xprt, msg, &reply, &replylen)) {
 223                         (void)sendto(xprt->xp_fd, reply, replylen, 0,
 224                             (struct sockaddr *)(void *)&ss, alen);
 225                         return (FALSE);
 226                 }
 227         }
 228         return (TRUE);
 229 }
 230
 231 static bool_t
 232 svc_dg_reply(SVCXPRT *xprt, struct rpc_msg *msg)
 233 {
 234         struct svc_dg_data *su;
 235         XDR *xdrs;
 236         bool_t stat = FALSE;
 237         size_t slen;
 238
 239         _DIAGASSERT(xprt != NULL);
 240         _DIAGASSERT(msg != NULL);
 241
 242         su = su_data(xprt);
 243         xdrs = &(su->su_xdrs);
 244
 245         xdrs->x_op = XDR_ENCODE;
 246         XDR_SETPOS(xdrs, 0);
 247         msg->rm_xid = su->su_xid;
 248         if (xdr_replymsg(xdrs, msg)) {
 249                 slen = XDR_GETPOS(xdrs);
 250                 if (sendto(xprt->xp_fd, rpc_buffer(xprt), slen, 0,
 251                     (struct sockaddr *)xprt->xp_rtaddr.buf,
 252                     (socklen_t)xprt->xp_rtaddr.len) == (ssize_t) slen) {
 253                         stat = TRUE;
 254                         if (su->su_cache)
 255                                 cache_set(xprt, slen);
 256                 }
 257         }
 258         return (stat);
 259 }
 260
 261 static bool_t
 262 svc_dg_getargs(SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr)
 263 {
 264         return (*xdr_args)(&(su_data(xprt)->su_xdrs), args_ptr);
 265 }
 266
 267 static bool_t
 268 svc_dg_freeargs(SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr)
 269 {
 270         XDR *xdrs;
 271
 272         _DIAGASSERT(xprt != NULL);
 273
 274         xdrs = &(su_data(xprt)->su_xdrs);
 275         xdrs->x_op = XDR_FREE;
 276         return (*xdr_args)(xdrs, args_ptr);
 277 }
 278
 279 static void
 280 svc_dg_destroy(SVCXPRT *xprt)
 281 {
 282         struct svc_dg_data *su;
 283
 284         _DIAGASSERT(xprt != NULL);
 285
 286         su = su_data(xprt);
 287
 288         xprt_unregister(xprt);
 289         if (xprt->xp_fd != -1)
 290                 (void)close(xprt->xp_fd);
 291         XDR_DESTROY(&(su->su_xdrs));
 292         (void) mem_free(rpc_buffer(xprt), su->su_iosz);
 293         (void) mem_free(su, sizeof (*su));
 294         if (xprt->xp_rtaddr.buf)
 295                 (void) mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.maxlen);
 296         if (xprt->xp_ltaddr.buf)
 297                 (void) mem_free(xprt->xp_ltaddr.buf, xprt->xp_ltaddr.maxlen);
 298         if (xprt->xp_tp)
 299                 (void) free(xprt->xp_tp);
 300         (void) mem_free(xprt, sizeof (SVCXPRT));
 301 }
 302
 303 static bool_t
 304 /*ARGSUSED*/
 305 svc_dg_control(SVCXPRT *xprt, const u_int rq, void *in)
 306 {
 307         return (FALSE);
 308 }
 309
 310 static void
 311 svc_dg_ops(SVCXPRT *xprt)
 312 {
 313         static struct xp_ops ops;
 314         static struct xp_ops2 ops2;
 315 #ifdef _REENTRANT
 316         extern mutex_t ops_lock;
 317 #endif
 318
 319         _DIAGASSERT(xprt != NULL);
 320
 321 /* VARIABLES PROTECTED BY ops_lock: ops */
 322
 323         mutex_lock(&ops_lock);
 324         if (ops.xp_recv == NULL) {
 325                 ops.xp_recv = svc_dg_recv;
 326                 ops.xp_stat = svc_dg_stat;
 327                 ops.xp_getargs = svc_dg_getargs;
 328                 ops.xp_reply = svc_dg_reply;
 329                 ops.xp_freeargs = svc_dg_freeargs;
 330                 ops.xp_destroy = svc_dg_destroy;
 331                 ops2.xp_control = svc_dg_control;
 332         }
 333         xprt->xp_ops = &ops;
 334         xprt->xp_ops2 = &ops2;
 335         mutex_unlock(&ops_lock);
 336 }
 337
 338 /*  The CACHING COMPONENT */
 339
 340 /*
 341  * Could have been a separate file, but some part of it depends upon the
 342  * private structure of the client handle.
 343  *
 344  * Fifo cache for cl server
 345  * Copies pointers to reply buffers into fifo cache
 346  * Buffers are sent again if retransmissions are detected.
 347  */
 348
 349 #define SPARSENESS 4    /* 75% sparse */
 350
 351 #define ALLOC(type, size)       \
 352         mem_alloc((sizeof (type) * (size)))
 353
 354 #define MEMZERO(addr, type, size)        \
 355         (void) memset((void *) (addr), 0, sizeof (type) * (int) (size))
 356
 357 #define FREE(addr, type, size)  \
 358         mem_free((addr), (sizeof (type) * (size)))
 359
 360 /*
 361  * An entry in the cache
 362  */
 363 typedef struct cache_node *cache_ptr;
 364 struct cache_node {
 365         /*
 366          * Index into cache is xid, proc, vers, prog and address
 367          */
 368         u_int32_t cache_xid;
 369         rpcproc_t cache_proc;
 370         rpcvers_t cache_vers;
 371         rpcprog_t cache_prog;
 372         struct netbuf cache_addr;
 373         /*
 374          * The cached reply and length
 375          */
 376         char *cache_reply;
 377         size_t cache_replylen;
 378         /*
 379          * Next node on the list, if there is a collision
 380          */
 381         cache_ptr cache_next;
 382 };
 383
 384 /*
 385  * The entire cache
 386  */
 387 struct cl_cache {
 388         u_int uc_size;          /* size of cache */
 389         cache_ptr *uc_entries;  /* hash table of entries in cache */
 390         cache_ptr *uc_fifo;     /* fifo list of entries in cache */
 391         u_int uc_nextvictim;    /* points to next victim in fifo list */
 392         rpcprog_t uc_prog;      /* saved program number */
 393         rpcvers_t uc_vers;      /* saved version number */
 394         rpcproc_t uc_proc;      /* saved procedure number */
 395 };
 396
 397
 398 /*
 399  * the hashing function
 400  */
 401 #define CACHE_LOC(transp, xid)  \
 402         (xid % (SPARSENESS * ((struct cl_cache *) \
 403                 su_data(transp)->su_cache)->uc_size))
 404
 405 #ifdef _REENTRANT
 406 extern mutex_t  dupreq_lock;
 407 #endif
 408
 409 /*
 410  * Enable use of the cache. Returns 1 on success, 0 on failure.
 411  * Note: there is no disable.
 412  */
 413 static const char cache_enable_str[] = "svc_enablecache: %s %s";
 414 static const char alloc_err[] = "could not allocate cache ";
 415 static const char enable_err[] = "cache already enabled";
 416
 417 int
 418 svc_dg_enablecache(SVCXPRT *transp, u_int size)
 419 {
 420         struct svc_dg_data *su;
 421         struct cl_cache *uc;
 422
 423         _DIAGASSERT(transp != NULL);
 424
 425         su = su_data(transp);
 426
 427         mutex_lock(&dupreq_lock);
 428         if (su->su_cache != NULL) {
 429                 (void) warnx(cache_enable_str, enable_err, " ");
 430                 mutex_unlock(&dupreq_lock);
 431                 return (0);
 432         }
 433         uc = ALLOC(struct cl_cache, 1);
 434         if (uc == NULL) {
 435                 warnx(cache_enable_str, alloc_err, " ");
 436                 mutex_unlock(&dupreq_lock);
 437                 return (0);
 438         }
 439         uc->uc_size = size;
 440         uc->uc_nextvictim = 0;
 441         uc->uc_entries = ALLOC(cache_ptr, size * SPARSENESS);
 442         if (uc->uc_entries == NULL) {
 443                 warnx(cache_enable_str, alloc_err, "data");
 444                 FREE(uc, struct cl_cache, 1);
 445                 mutex_unlock(&dupreq_lock);
 446                 return (0);
 447         }
 448         MEMZERO(uc->uc_entries, cache_ptr, size * SPARSENESS);
 449         uc->uc_fifo = ALLOC(cache_ptr, size);
 450         if (uc->uc_fifo == NULL) {
 451                 warnx(cache_enable_str, alloc_err, "fifo");
 452                 FREE(uc->uc_entries, cache_ptr, size * SPARSENESS);
 453                 FREE(uc, struct cl_cache, 1);
 454                 mutex_unlock(&dupreq_lock);
 455                 return (0);
 456         }
 457         MEMZERO(uc->uc_fifo, cache_ptr, size);
 458         su->su_cache = (char *)(void *)uc;
 459         mutex_unlock(&dupreq_lock);
 460         return (1);
 461 }
 462
 463 /*
 464  * Set an entry in the cache.  It assumes that the uc entry is set from
 465  * the earlier call to cache_get() for the same procedure.  This will always
 466  * happen because cache_get() is calle by svc_dg_recv and cache_set() is called
 467  * by svc_dg_reply().  All this hoopla because the right RPC parameters are
 468  * not available at svc_dg_reply time.
 469  */
 470
 471 static const char cache_set_str[] = "cache_set: %s";
 472 static const char cache_set_err1[] = "victim not found";
 473 static const char cache_set_err2[] = "victim alloc failed";
 474 static const char cache_set_err3[] = "could not allocate new rpc buffer";
 475
 476 static void
 477 cache_set(SVCXPRT *xprt, size_t replylen)
 478 {
 479         cache_ptr victim;
 480         cache_ptr *vicp;
 481         struct svc_dg_data *su;
 482         struct cl_cache *uc;
 483         u_int loc;
 484         char *newbuf;
 485 #ifdef RPC_CACHE_DEBUG
 486         struct netconfig *nconf;
 487         char *uaddr;
 488 #endif
 489
 490         _DIAGASSERT(xprt != NULL);
 491
 492         su = su_data(xprt);
 493         uc = (struct cl_cache *) su->su_cache;
 494
 495         mutex_lock(&dupreq_lock);
 496         /*
 497          * Find space for the new entry, either by
 498          * reusing an old entry, or by mallocing a new one
 499          */
 500         victim = uc->uc_fifo[uc->uc_nextvictim];
 501         if (victim != NULL) {
 502                 loc = CACHE_LOC(xprt, victim->cache_xid);
 503                 for (vicp = &uc->uc_entries[loc];
 504                         *vicp != NULL && *vicp != victim;
 505                         vicp = &(*vicp)->cache_next)
 506                         ;
 507                 if (*vicp == NULL) {
 508                         warnx(cache_set_str, cache_set_err1);
 509                         mutex_unlock(&dupreq_lock);
 510                         return;
 511                 }
 512                 *vicp = victim->cache_next;     /* remove from cache */
 513                 newbuf = victim->cache_reply;
 514         } else {
 515                 victim = ALLOC(struct cache_node, 1);
 516                 if (victim == NULL) {
 517                         warnx(cache_set_str, cache_set_err2);
 518                         mutex_unlock(&dupreq_lock);
 519                         return;
 520                 }
 521                 newbuf = mem_alloc(su->su_iosz);
 522                 if (newbuf == NULL) {
 523                         warnx(cache_set_str, cache_set_err3);
 524                         FREE(victim, struct cache_node, 1);
 525                         mutex_unlock(&dupreq_lock);
 526                         return;
 527                 }
 528         }
 529
 530         /*
 531          * Store it away
 532          */
 533 #ifdef RPC_CACHE_DEBUG
 534         if (nconf = getnetconfigent(xprt->xp_netid)) {
 535                 uaddr = taddr2uaddr(nconf, &xprt->xp_rtaddr);
 536                 freenetconfigent(nconf);
 537                 printf(
 538         "cache set for xid= %x prog=%d vers=%d proc=%d for rmtaddr=%s\n",
 539                         su->su_xid, uc->uc_prog, uc->uc_vers,
 540                         uc->uc_proc, uaddr);
 541                 free(uaddr);
 542         }
 543 #endif
 544         victim->cache_replylen = replylen;
 545         victim->cache_reply = rpc_buffer(xprt);
 546         rpc_buffer(xprt) = newbuf;
 547         _DIAGASSERT(__type_fit(u_int, su->su_iosz));
 548         xdrmem_create(&(su->su_xdrs), rpc_buffer(xprt), (u_int)su->su_iosz,
 549             XDR_ENCODE);
 550         victim->cache_xid = su->su_xid;
 551         victim->cache_proc = uc->uc_proc;
 552         victim->cache_vers = uc->uc_vers;
 553         victim->cache_prog = uc->uc_prog;
 554         victim->cache_addr = xprt->xp_rtaddr;
 555         victim->cache_addr.buf = ALLOC(char, xprt->xp_rtaddr.len);
 556         (void) memcpy(victim->cache_addr.buf, xprt->xp_rtaddr.buf,
 557             (size_t)xprt->xp_rtaddr.len);
 558         loc = CACHE_LOC(xprt, victim->cache_xid);
 559         victim->cache_next = uc->uc_entries[loc];
 560         uc->uc_entries[loc] = victim;
 561         uc->uc_fifo[uc->uc_nextvictim++] = victim;
 562         uc->uc_nextvictim %= uc->uc_size;
 563         mutex_unlock(&dupreq_lock);
 564 }
 565
 566 /*
 567  * Try to get an entry from the cache
 568  * return 1 if found, 0 if not found and set the stage for cache_set()
 569  */
 570 static int
 571 cache_get(SVCXPRT *xprt, struct rpc_msg *msg, char **replyp, size_t *replylenp)
 572 {
 573         u_int loc;
 574         cache_ptr ent;
 575         struct svc_dg_data *su;
 576         struct cl_cache *uc;
 577 #ifdef RPC_CACHE_DEBUG
 578         struct netconfig *nconf;
 579         char *uaddr;
 580 #endif
 581
 582         _DIAGASSERT(xprt != NULL);
 583         _DIAGASSERT(msg != NULL);
 584         _DIAGASSERT(replyp != NULL);
 585         _DIAGASSERT(replylenp != NULL);
 586
 587         su = su_data(xprt);
 588         uc = (struct cl_cache *) su->su_cache;
 589
 590         mutex_lock(&dupreq_lock);
 591         loc = CACHE_LOC(xprt, su->su_xid);
 592         for (ent = uc->uc_entries[loc]; ent != NULL; ent = ent->cache_next) {
 593                 if (ent->cache_xid == su->su_xid &&
 594                         ent->cache_proc == msg->rm_call.cb_proc &&
 595                         ent->cache_vers == msg->rm_call.cb_vers &&
 596                         ent->cache_prog == msg->rm_call.cb_prog &&
 597                         ent->cache_addr.len == xprt->xp_rtaddr.len &&
 598                         (memcmp(ent->cache_addr.buf, xprt->xp_rtaddr.buf,
 599                                 xprt->xp_rtaddr.len) == 0)) {
 600 #ifdef RPC_CACHE_DEBUG
 601                         if (nconf = getnetconfigent(xprt->xp_netid)) {
 602                                 uaddr = taddr2uaddr(nconf, &xprt->xp_rtaddr);
 603                                 freenetconfigent(nconf);
 604                                 printf(
 605         "cache entry found for xid=%x prog=%d vers=%d proc=%d for rmtaddr=%s\n",
 606                                         su->su_xid, msg->rm_call.cb_prog,
 607                                         msg->rm_call.cb_vers,
 608                                         msg->rm_call.cb_proc, uaddr);
 609                                 free(uaddr);
 610                         }
 611 #endif
 612                         *replyp = ent->cache_reply;
 613                         *replylenp = ent->cache_replylen;
 614                         mutex_unlock(&dupreq_lock);
 615                         return (1);
 616                 }
 617         }
 618         /*
 619          * Failed to find entry
 620          * Remember a few things so we can do a set later
 621          */
 622         uc->uc_proc = msg->rm_call.cb_proc;
 623         uc->uc_vers = msg->rm_call.cb_vers;
 624         uc->uc_prog = msg->rm_call.cb_prog;
 625         mutex_unlock(&dupreq_lock);
 626         return (0);
 627 }