2 static char sfs_svc_udp_id[] = "@(#)svc_udp.c 2.1 97/10/23";
4 /* @(#)svc_udp.c 2.2 88/07/29 4.0 RPCSRC */
6 * Copyright (c) 1992-1997,2001 by Standard Performance Evaluation Corporation
8 * Standard Performance Evaluation Corporation (SPEC)
9 * 6585 Merchant Place, Suite 100
12 * This product contains benchmarks acquired from several sources who
13 * understand and agree with SPEC's goal of creating fair and objective
14 * benchmarks to measure computer performance.
16 * This copyright notice is placed here only to protect SPEC in the
17 * event the source is misused in any manner that is contrary to the
18 * spirit, the goals and the intent of SPEC.
20 * The source code is provided to the user or company under the license
21 * agreement for the SPEC Benchmark Suite for this product.
24 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
25 * unrestricted use provided that this legend is included on all tape
26 * media and as a part of the software program in whole or part. Users
27 * may copy or modify Sun RPC without charge, but are not authorized
28 * to license or distribute it to anyone else except as part of a product or
29 * program developed by the user.
31 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
32 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
33 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
35 * Sun RPC is provided with no support and without any obligation on the
36 * part of Sun Microsystems, Inc. to assist in its use, correction,
37 * modification or enhancement.
39 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
40 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
41 * OR ANY PART THEREOF.
43 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
44 * or profits or other special, indirect and consequential damages, even if
45 * Sun has been advised of the possibility of such damages.
47 * Sun Microsystems, Inc.
49 * Mountain View, California 94043
51 #if !defined(lint) && defined(SCCSIDS)
52 static char sccsid[] = "@(#)svc_udp.c 1.24 87/08/11 Copyr 1984 Sun Micro";
57 * Server side for UDP/IP based RPC. (Does some caching in the hopes of
58 * achieving execute-at-most-once semantics.)
60 * Copyright (C) 1984, Sun Microsystems, Inc.
68 #include "rpc/osdep.h"
72 #define rpc_buffer(xprt) ((xprt)->xp_p1)
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, void *);
78 static bool_t svcudp_freeargs(SVCXPRT *, xdrproc_t, void *);
79 static void svcudp_destroy(SVCXPRT *);
81 static struct xp_ops svcudp_op = {
94 uint_t su_iosz; /* byte size of send.recv buffer */
95 uint32_t su_xid; /* transaction id */
96 XDR su_xdrs; /* XDR handle */
97 char su_verfbody[MAX_AUTH_BYTES]; /* verifier body */
98 char * su_cache; /* cached data, NULL if no cache */
100 #define su_data(xprt) ((struct svcudp_data *)(xprt->xp_p2))
102 static void cache_set(SVCXPRT *, uint32_t);
103 static int cache_get(SVCXPRT *, struct rpc_msg *, char **, uint32_t *);
107 * xprt = svcudp_create(sock);
109 * If sock<0 then a socket is created, else sock is used.
110 * If the socket, sock is not bound to a port then svcudp_create
111 * binds it to an arbitrary port. In any (successful) case,
112 * xprt->xp_sock is the registered socket number and xprt->xp_port is the
113 * associated port number.
114 * Once *xprt is initialized, it is registered as a transporter;
115 * see (svc.h, xprt_register).
116 * The routines returns NULL if a problem occurred.
124 bool_t madesock = FALSE;
126 struct svcudp_data *su;
127 struct sockaddr_in addr;
134 len = sizeof(struct sockaddr_in);
136 if (sock == RPC_ANYSOCK) {
137 if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
138 perror("svcudp_create: socket creation problem");
139 return ((SVCXPRT *)NULL);
143 memset((char *)&addr, '\0', sizeof (addr));
144 addr.sin_family = AF_INET;
145 if (bindresvport(sock, &addr)) {
147 (void)bind(sock, (struct sockaddr *)&addr, len);
149 if (getsockname(sock, (struct sockaddr *)&addr, &len) != 0) {
150 perror("svcudp_create - cannot getsockname");
153 return ((SVCXPRT *)NULL);
155 xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
157 (void)fprintf(stderr, "svcudp_create: out of memory\n");
160 su = (struct svcudp_data *)mem_alloc(sizeof(struct svcudp_data));
162 (void)fprintf(stderr, "svcudp_create: out of memory\n");
165 su->su_iosz = ((((sendsz > recvsz) ? sendsz : recvsz) + 3) / 4) * 4;
166 if ((rpc_buffer(xprt) = mem_alloc(su->su_iosz)) == NULL) {
167 (void)fprintf(stderr, "svcudp_create: out of memory\n");
171 &(su->su_xdrs), rpc_buffer(xprt), su->su_iosz, XDR_DECODE);
173 xprt->xp_p2 = (caddr_t)su;
174 xprt->xp_verf.oa_base = su->su_verfbody;
175 xprt->xp_ops = &svcudp_op;
176 xprt->xp_port = ntohs(addr.sin_port);
177 xprt->xp_sock = sock;
187 return(svcudp_bufcreate(sock, UDPMSGSIZE, UDPMSGSIZE));
191 static enum xprt_stat
204 struct svcudp_data *su = su_data(xprt);
205 XDR *xdrs = &(su->su_xdrs);
211 xprt->xp_addrlen = sizeof(struct sockaddr_in);
212 rlen = recvfrom(xprt->xp_sock, rpc_buffer(xprt), (int) su->su_iosz,
213 0, (struct sockaddr *)&(xprt->xp_raddr), &(xprt->xp_addrlen));
214 if (rlen == -1 && errno == EINTR)
216 if (rlen < 4*sizeof(uint32_t))
218 xdrs->x_op = XDR_DECODE;
220 if (! xdr_callmsg(xdrs, msg))
222 su->su_xid = msg->rm_xid;
223 if (su->su_cache != NULL) {
224 if (cache_get(xprt, msg, &reply, &replylen)) {
225 (void) sendto(xprt->xp_sock, reply, (int) replylen, 0,
226 (struct sockaddr *) &xprt->xp_raddr, xprt->xp_addrlen);
238 struct svcudp_data *su = su_data(xprt);
239 XDR *xdrs = &(su->su_xdrs);
243 xdrs->x_op = XDR_ENCODE;
245 msg->rm_xid = su->su_xid;
246 if (xdr_replymsg(xdrs, msg)) {
247 slen = (int)XDR_GETPOS(xdrs);
248 if (sendto(xprt->xp_sock, rpc_buffer(xprt), slen, 0,
249 (struct sockaddr *)&(xprt->xp_raddr), xprt->xp_addrlen)
252 if (su->su_cache && slen >= 0) {
253 cache_set(xprt, (uint32_t) slen);
267 return ((*xdr_args)(&(su_data(xprt)->su_xdrs), args_ptr));
276 XDR *xdrs = &(su_data(xprt)->su_xdrs);
278 xdrs->x_op = XDR_FREE;
279 return ((*xdr_args)(xdrs, args_ptr));
286 struct svcudp_data *su = su_data(xprt);
288 xprt_unregister(xprt);
289 (void)close(xprt->xp_sock);
290 XDR_DESTROY(&(su->su_xdrs));
291 mem_free(rpc_buffer(xprt), su->su_iosz);
292 mem_free((caddr_t)su, sizeof(struct svcudp_data));
293 mem_free((caddr_t)xprt, sizeof(SVCXPRT));
297 /***********this could be a separate file*********************/
300 * Fifo cache for udp server
301 * Copies pointers to reply buffers into fifo cache
302 * Buffers are sent again if retransmissions are detected.
305 #define SPARSENESS 4 /* 75% sparse */
307 #define CACHE_PERROR(msg) \
308 (void) fprintf(stderr,"%s\n", msg)
310 #define ALLOC(type, size) \
311 (type *) mem_alloc((unsigned) (sizeof(type) * (size)))
313 #define BZERO(addr, type, size) \
314 memset((void *) addr, '\0', sizeof(type) * (int) (size))
317 * An entry in the cache
319 typedef struct cache_node *cache_ptr;
322 * Index into cache is xid, proc, vers, prog and address
328 struct sockaddr_in cache_addr;
330 * The cached reply and length
333 uint32_t cache_replylen;
335 * Next node on the list, if there is a collision
337 cache_ptr cache_next;
346 uint32_t uc_size; /* size of cache */
347 cache_ptr *uc_entries; /* hash table of entries in cache */
348 cache_ptr *uc_fifo; /* fifo list of entries in cache */
349 uint32_t uc_nextvictim; /* points to next victim in fifo list */
350 uint32_t uc_prog; /* saved program number */
351 uint32_t uc_vers; /* saved version number */
352 uint32_t uc_proc; /* saved procedure number */
353 struct sockaddr_in uc_addr; /* saved caller's address */
358 * the hashing function
360 #define CACHE_LOC(transp, xid) \
361 (xid % (SPARSENESS*((struct udp_cache *) su_data(transp)->su_cache)->uc_size))
365 * Enable use of the cache.
366 * Note: there is no disable.
372 struct svcudp_data *su = su_data(transp);
373 struct udp_cache *uc;
375 if (su->su_cache != NULL) {
376 CACHE_PERROR("enablecache: cache already enabled");
379 uc = ALLOC(struct udp_cache, 1);
381 CACHE_PERROR("enablecache: could not allocate cache");
385 uc->uc_nextvictim = 0;
386 uc->uc_entries = ALLOC(cache_ptr, size * SPARSENESS);
387 if (uc->uc_entries == NULL) {
388 CACHE_PERROR("enablecache: could not allocate cache data");
391 BZERO(uc->uc_entries, cache_ptr, size * SPARSENESS);
392 uc->uc_fifo = ALLOC(cache_ptr, size);
393 if (uc->uc_fifo == NULL) {
394 CACHE_PERROR("enablecache: could not allocate cache fifo");
397 BZERO(uc->uc_fifo, cache_ptr, size);
398 su->su_cache = (char *) uc;
404 * Set an entry in the cache
413 struct svcudp_data *su = su_data(xprt);
414 struct udp_cache *uc = (struct udp_cache *) su->su_cache;
419 * Find space for the new entry, either by
420 * reusing an old entry, or by mallocing a new one
422 victim = uc->uc_fifo[uc->uc_nextvictim];
423 if (victim != NULL) {
424 loc = CACHE_LOC(xprt, victim->cache_xid);
425 for (vicp = &uc->uc_entries[loc];
426 *vicp != NULL && *vicp != victim;
427 vicp = &(*vicp)->cache_next)
430 CACHE_PERROR("cache_set: victim not found");
433 *vicp = victim->cache_next; /* remote from cache */
434 newbuf = victim->cache_reply;
436 victim = ALLOC(struct cache_node, 1);
437 if (victim == NULL) {
438 CACHE_PERROR("cache_set: victim alloc failed");
441 newbuf = mem_alloc(su->su_iosz);
442 if (newbuf == NULL) {
443 CACHE_PERROR("cache_set: could not allocate new rpc_buffer");
451 victim->cache_replylen = replylen;
452 victim->cache_reply = rpc_buffer(xprt);
453 rpc_buffer(xprt) = newbuf;
454 xdrmem_create(&(su->su_xdrs), rpc_buffer(xprt), su->su_iosz, XDR_ENCODE);
455 victim->cache_xid = su->su_xid;
456 victim->cache_proc = uc->uc_proc;
457 victim->cache_vers = uc->uc_vers;
458 victim->cache_prog = uc->uc_prog;
459 victim->cache_addr = uc->uc_addr;
460 loc = CACHE_LOC(xprt, victim->cache_xid);
461 victim->cache_next = uc->uc_entries[loc];
462 uc->uc_entries[loc] = victim;
463 uc->uc_fifo[uc->uc_nextvictim++] = victim;
464 uc->uc_nextvictim %= uc->uc_size;
468 * Try to get an entry from the cache
469 * return 1 if found, 0 if not found
480 struct svcudp_data *su = su_data(xprt);
481 struct udp_cache *uc = (struct udp_cache *) su->su_cache;
483 # define EQADDR(a1, a2) (memcmp((char*)&a1, (char*)&a2, sizeof(a1)) == 0)
485 loc = CACHE_LOC(xprt, su->su_xid);
486 for (ent = uc->uc_entries[loc]; ent != NULL; ent = ent->cache_next) {
487 if (ent->cache_xid == su->su_xid &&
488 ent->cache_proc == uc->uc_proc &&
489 ent->cache_vers == uc->uc_vers &&
490 ent->cache_prog == uc->uc_prog &&
491 EQADDR(ent->cache_addr, uc->uc_addr)) {
492 *replyp = ent->cache_reply;
493 *replylenp = ent->cache_replylen;
498 * Failed to find entry
499 * Remember a few things so we can do a set later
501 uc->uc_proc = msg->rm_call.cb_proc;
502 uc->uc_vers = msg->rm_call.cb_vers;
503 uc->uc_prog = msg->rm_call.cb_prog;
504 uc->uc_addr = xprt->xp_raddr;