1 /* $NetBSD: svc_dg.c,v 1.4 2000/07/06 03:10:35 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2009, Sun Microsystems, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * - Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 * - Neither the name of Sun Microsystems, Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived
16 * from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 /*
32 * Copyright (c) 1986-1991 by Sun Microsystems Inc.
33 */
34
35 #if defined(LIBC_SCCS) && !defined(lint)
36 #ident "@(#)svc_dg.c 1.17 94/04/24 SMI"
37 #endif
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD: stable/9/lib/libc/rpc/svc_dg.c 291054 2015-11-19 03:53:31Z ngie $");
40
41 /*
42 * svc_dg.c, Server side for connectionless RPC.
43 *
44 * Does some caching in the hopes of achieving execute-at-most-once semantics.
45 */
46
47 #include "namespace.h"
48 #include "reentrant.h"
49 #include <sys/types.h>
50 #include <sys/socket.h>
51 #include <rpc/rpc.h>
52 #include <rpc/svc_dg.h>
53 #include <assert.h>
54 #include <errno.h>
55 #include <unistd.h>
56 #include <stdio.h>
57 #include <stdlib.h>
58 #include <string.h>
59 #ifdef RPC_CACHE_DEBUG
60 #include <netconfig.h>
61 #include <netdir.h>
62 #endif
63 #include <err.h>
64 #include "un-namespace.h"
65
66 #include "rpc_com.h"
67 #include "mt_misc.h"
68
69 #define su_data(xprt) ((struct svc_dg_data *)(xprt->xp_p2))
70 #define rpc_buffer(xprt) ((xprt)->xp_p1)
71
72 #ifndef MAX
73 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
74 #endif
75
76 static void svc_dg_ops(SVCXPRT *);
77 static enum xprt_stat svc_dg_stat(SVCXPRT *);
78 static bool_t svc_dg_recv(SVCXPRT *, struct rpc_msg *);
79 static bool_t svc_dg_reply(SVCXPRT *, struct rpc_msg *);
80 static bool_t svc_dg_getargs(SVCXPRT *, xdrproc_t, void *);
81 static bool_t svc_dg_freeargs(SVCXPRT *, xdrproc_t, void *);
82 static void svc_dg_destroy(SVCXPRT *);
83 static bool_t svc_dg_control(SVCXPRT *, const u_int, void *);
84 static int cache_get(SVCXPRT *, struct rpc_msg *, char **, size_t *);
85 static void cache_set(SVCXPRT *, size_t);
86 int svc_dg_enablecache(SVCXPRT *, u_int);
87
88 /*
89 * Usage:
90 * xprt = svc_dg_create(sock, sendsize, recvsize);
91 * Does other connectionless specific initializations.
92 * Once *xprt is initialized, it is registered.
93 * see (svc.h, xprt_register). If recvsize or sendsize are 0 suitable
94 * system defaults are chosen.
95 * The routines returns NULL if a problem occurred.
96 */
97 static const char svc_dg_str[] = "svc_dg_create: %s";
98 static const char svc_dg_err1[] = "could not get transport information";
99 static const char svc_dg_err2[] = "transport does not support data transfer";
100 static const char svc_dg_err3[] = "getsockname failed";
101 static const char svc_dg_err4[] = "cannot set IP_RECVDSTADDR";
102 static const char __no_mem_str[] = "out of memory";
103
104 SVCXPRT *
svc_dg_create(fd,sendsize,recvsize)105 svc_dg_create(fd, sendsize, recvsize)
106 int fd;
107 u_int sendsize;
108 u_int recvsize;
109 {
110 SVCXPRT *xprt;
111 struct svc_dg_data *su = NULL;
112 struct __rpc_sockinfo si;
113 struct sockaddr_storage ss;
114 socklen_t slen;
115
116 if (!__rpc_fd2sockinfo(fd, &si)) {
117 warnx(svc_dg_str, svc_dg_err1);
118 return (NULL);
119 }
120 /*
121 * Find the receive and the send size
122 */
123 sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize);
124 recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize);
125 if ((sendsize == 0) || (recvsize == 0)) {
126 warnx(svc_dg_str, svc_dg_err2);
127 return (NULL);
128 }
129
130 xprt = svc_xprt_alloc();
131 if (xprt == NULL)
132 goto freedata;
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) = mem_alloc(su->su_iosz)) == NULL)
139 goto freedata;
140 xdrmem_create(&(su->su_xdrs), rpc_buffer(xprt), su->su_iosz,
141 XDR_DECODE);
142 su->su_cache = NULL;
143 xprt->xp_fd = fd;
144 xprt->xp_p2 = su;
145 xprt->xp_verf.oa_base = su->su_verfbody;
146 svc_dg_ops(xprt);
147 xprt->xp_rtaddr.maxlen = sizeof (struct sockaddr_storage);
148
149 slen = sizeof ss;
150 if (_getsockname(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) {
151 warnx(svc_dg_str, svc_dg_err3);
152 goto freedata_nowarn;
153 }
154 xprt->xp_ltaddr.buf = mem_alloc(sizeof (struct sockaddr_storage));
155 xprt->xp_ltaddr.maxlen = sizeof (struct sockaddr_storage);
156 xprt->xp_ltaddr.len = slen;
157 memcpy(xprt->xp_ltaddr.buf, &ss, slen);
158
159 if (ss.ss_family == AF_INET) {
160 struct sockaddr_in *sin;
161 static const int true_value = 1;
162
163 sin = (struct sockaddr_in *)(void *)&ss;
164 if (sin->sin_addr.s_addr == INADDR_ANY) {
165 su->su_srcaddr.buf = mem_alloc(sizeof (ss));
166 su->su_srcaddr.maxlen = sizeof (ss);
167
168 if (_setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR,
169 &true_value, sizeof(true_value))) {
170 warnx(svc_dg_str, svc_dg_err4);
171 goto freedata_nowarn;
172 }
173 }
174 }
175
176 xprt_register(xprt);
177 return (xprt);
178 freedata:
179 (void) warnx(svc_dg_str, __no_mem_str);
180 freedata_nowarn:
181 if (xprt) {
182 if (su)
183 (void) mem_free(su, sizeof (*su));
184 svc_xprt_free(xprt);
185 }
186 return (NULL);
187 }
188
189 /*ARGSUSED*/
190 static enum xprt_stat
svc_dg_stat(xprt)191 svc_dg_stat(xprt)
192 SVCXPRT *xprt;
193 {
194 return (XPRT_IDLE);
195 }
196
197 static int
svc_dg_recvfrom(int fd,char * buf,int buflen,struct sockaddr * raddr,socklen_t * raddrlen,struct sockaddr * laddr,socklen_t * laddrlen)198 svc_dg_recvfrom(int fd, char *buf, int buflen,
199 struct sockaddr *raddr, socklen_t *raddrlen,
200 struct sockaddr *laddr, socklen_t *laddrlen)
201 {
202 struct msghdr msg;
203 struct iovec msg_iov[1];
204 struct sockaddr_in *lin = (struct sockaddr_in *)laddr;
205 int rlen;
206 bool_t have_lin = FALSE;
207 char tmp[CMSG_LEN(sizeof(*lin))];
208 struct cmsghdr *cmsg;
209
210 memset((char *)&msg, 0, sizeof(msg));
211 msg_iov[0].iov_base = buf;
212 msg_iov[0].iov_len = buflen;
213 msg.msg_iov = msg_iov;
214 msg.msg_iovlen = 1;
215 msg.msg_namelen = *raddrlen;
216 msg.msg_name = (char *)raddr;
217 if (laddr != NULL) {
218 msg.msg_control = (caddr_t)tmp;
219 msg.msg_controllen = CMSG_LEN(sizeof(*lin));
220 }
221 rlen = _recvmsg(fd, &msg, 0);
222 if (rlen >= 0)
223 *raddrlen = msg.msg_namelen;
224
225 if (rlen == -1 || laddr == NULL ||
226 msg.msg_controllen < sizeof(struct cmsghdr) ||
227 msg.msg_flags & MSG_CTRUNC)
228 return rlen;
229
230 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL;
231 cmsg = CMSG_NXTHDR(&msg, cmsg)) {
232 if (cmsg->cmsg_level == IPPROTO_IP &&
233 cmsg->cmsg_type == IP_RECVDSTADDR) {
234 have_lin = TRUE;
235 memcpy(&lin->sin_addr,
236 (struct in_addr *)CMSG_DATA(cmsg),
237 sizeof(struct in_addr));
238 break;
239 }
240 }
241
242 lin->sin_family = AF_INET;
243 lin->sin_port = 0;
244 *laddrlen = sizeof(struct sockaddr_in);
245
246 if (!have_lin)
247 lin->sin_addr.s_addr = INADDR_ANY;
248
249 return rlen;
250 }
251
252 static bool_t
svc_dg_recv(xprt,msg)253 svc_dg_recv(xprt, msg)
254 SVCXPRT *xprt;
255 struct rpc_msg *msg;
256 {
257 struct svc_dg_data *su = su_data(xprt);
258 XDR *xdrs = &(su->su_xdrs);
259 char *reply;
260 struct sockaddr_storage ss;
261 socklen_t alen;
262 size_t replylen;
263 ssize_t rlen;
264
265 again:
266 alen = sizeof (struct sockaddr_storage);
267 rlen = svc_dg_recvfrom(xprt->xp_fd, rpc_buffer(xprt), su->su_iosz,
268 (struct sockaddr *)(void *)&ss, &alen,
269 (struct sockaddr *)su->su_srcaddr.buf, &su->su_srcaddr.len);
270 if (rlen == -1 && errno == EINTR)
271 goto again;
272 if (rlen == -1 || (rlen < (ssize_t)(4 * sizeof (u_int32_t))))
273 return (FALSE);
274 if (xprt->xp_rtaddr.len < alen) {
275 if (xprt->xp_rtaddr.len != 0)
276 mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.len);
277 xprt->xp_rtaddr.buf = mem_alloc(alen);
278 xprt->xp_rtaddr.len = alen;
279 }
280 memcpy(xprt->xp_rtaddr.buf, &ss, alen);
281 #ifdef PORTMAP
282 if (ss.ss_family == AF_INET) {
283 xprt->xp_raddr = *(struct sockaddr_in *)xprt->xp_rtaddr.buf;
284 xprt->xp_addrlen = sizeof (struct sockaddr_in);
285 }
286 #endif /* PORTMAP */
287 xdrs->x_op = XDR_DECODE;
288 XDR_SETPOS(xdrs, 0);
289 if (! xdr_callmsg(xdrs, msg)) {
290 return (FALSE);
291 }
292 su->su_xid = msg->rm_xid;
293 if (su->su_cache != NULL) {
294 if (cache_get(xprt, msg, &reply, &replylen)) {
295 (void)_sendto(xprt->xp_fd, reply, replylen, 0,
296 (struct sockaddr *)(void *)&ss, alen);
297 return (FALSE);
298 }
299 }
300 return (TRUE);
301 }
302
303 static int
svc_dg_sendto(int fd,char * buf,int buflen,const struct sockaddr * raddr,socklen_t raddrlen,const struct sockaddr * laddr,socklen_t laddrlen)304 svc_dg_sendto(int fd, char *buf, int buflen,
305 const struct sockaddr *raddr, socklen_t raddrlen,
306 const struct sockaddr *laddr, socklen_t laddrlen)
307 {
308 struct msghdr msg;
309 struct iovec msg_iov[1];
310 struct sockaddr_in *laddr_in = (struct sockaddr_in *)laddr;
311 struct in_addr *lin = &laddr_in->sin_addr;
312 char tmp[CMSG_SPACE(sizeof(*lin))];
313 struct cmsghdr *cmsg;
314
315 memset((char *)&msg, 0, sizeof(msg));
316 msg_iov[0].iov_base = buf;
317 msg_iov[0].iov_len = buflen;
318 msg.msg_iov = msg_iov;
319 msg.msg_iovlen = 1;
320 msg.msg_namelen = raddrlen;
321 msg.msg_name = (char *)raddr;
322
323 if (laddr != NULL && laddr->sa_family == AF_INET &&
324 lin->s_addr != INADDR_ANY) {
325 msg.msg_control = (caddr_t)tmp;
326 msg.msg_controllen = CMSG_LEN(sizeof(*lin));
327 cmsg = CMSG_FIRSTHDR(&msg);
328 cmsg->cmsg_len = CMSG_LEN(sizeof(*lin));
329 cmsg->cmsg_level = IPPROTO_IP;
330 cmsg->cmsg_type = IP_SENDSRCADDR;
331 memcpy(CMSG_DATA(cmsg), lin, sizeof(*lin));
332 }
333
334 return _sendmsg(fd, &msg, 0);
335 }
336
337 static bool_t
svc_dg_reply(xprt,msg)338 svc_dg_reply(xprt, msg)
339 SVCXPRT *xprt;
340 struct rpc_msg *msg;
341 {
342 struct svc_dg_data *su = su_data(xprt);
343 XDR *xdrs = &(su->su_xdrs);
344 bool_t stat = TRUE;
345 size_t slen;
346 xdrproc_t xdr_proc;
347 caddr_t xdr_where;
348
349 xdrs->x_op = XDR_ENCODE;
350 XDR_SETPOS(xdrs, 0);
351 msg->rm_xid = su->su_xid;
352 if (msg->rm_reply.rp_stat == MSG_ACCEPTED &&
353 msg->rm_reply.rp_acpt.ar_stat == SUCCESS) {
354 xdr_proc = msg->acpted_rply.ar_results.proc;
355 xdr_where = msg->acpted_rply.ar_results.where;
356 msg->acpted_rply.ar_results.proc = (xdrproc_t) xdr_void;
357 msg->acpted_rply.ar_results.where = NULL;
358
359 if (!xdr_replymsg(xdrs, msg) ||
360 !SVCAUTH_WRAP(&SVC_AUTH(xprt), xdrs, xdr_proc, xdr_where))
361 stat = FALSE;
362 } else {
363 stat = xdr_replymsg(xdrs, msg);
364 }
365 if (stat) {
366 slen = XDR_GETPOS(xdrs);
367 if (svc_dg_sendto(xprt->xp_fd, rpc_buffer(xprt), slen,
368 (struct sockaddr *)xprt->xp_rtaddr.buf,
369 (socklen_t)xprt->xp_rtaddr.len,
370 (struct sockaddr *)su->su_srcaddr.buf,
371 (socklen_t)su->su_srcaddr.len) == (ssize_t) slen) {
372 stat = TRUE;
373 if (su->su_cache)
374 cache_set(xprt, slen);
375 }
376 }
377 return (stat);
378 }
379
380 static bool_t
svc_dg_getargs(xprt,xdr_args,args_ptr)381 svc_dg_getargs(xprt, xdr_args, args_ptr)
382 SVCXPRT *xprt;
383 xdrproc_t xdr_args;
384 void *args_ptr;
385 {
386 struct svc_dg_data *su;
387
388 assert(xprt != NULL);
389 su = su_data(xprt);
390 return (SVCAUTH_UNWRAP(&SVC_AUTH(xprt),
391 &su->su_xdrs, xdr_args, args_ptr));
392 }
393
394 static bool_t
svc_dg_freeargs(xprt,xdr_args,args_ptr)395 svc_dg_freeargs(xprt, xdr_args, args_ptr)
396 SVCXPRT *xprt;
397 xdrproc_t xdr_args;
398 void *args_ptr;
399 {
400 XDR *xdrs = &(su_data(xprt)->su_xdrs);
401
402 xdrs->x_op = XDR_FREE;
403 return (*xdr_args)(xdrs, args_ptr);
404 }
405
406 static void
svc_dg_destroy(xprt)407 svc_dg_destroy(xprt)
408 SVCXPRT *xprt;
409 {
410 struct svc_dg_data *su = su_data(xprt);
411
412 xprt_unregister(xprt);
413 if (xprt->xp_fd != -1)
414 (void)_close(xprt->xp_fd);
415 XDR_DESTROY(&(su->su_xdrs));
416 (void) mem_free(rpc_buffer(xprt), su->su_iosz);
417 if (su->su_srcaddr.buf)
418 (void) mem_free(su->su_srcaddr.buf, su->su_srcaddr.maxlen);
419 (void) mem_free(su, sizeof (*su));
420 if (xprt->xp_rtaddr.buf)
421 (void) mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.maxlen);
422 if (xprt->xp_ltaddr.buf)
423 (void) mem_free(xprt->xp_ltaddr.buf, xprt->xp_ltaddr.maxlen);
424 free(xprt->xp_tp);
425 svc_xprt_free(xprt);
426 }
427
428 static bool_t
429 /*ARGSUSED*/
svc_dg_control(xprt,rq,in)430 svc_dg_control(xprt, rq, in)
431 SVCXPRT *xprt;
432 const u_int rq;
433 void *in;
434 {
435 return (FALSE);
436 }
437
438 static void
svc_dg_ops(xprt)439 svc_dg_ops(xprt)
440 SVCXPRT *xprt;
441 {
442 static struct xp_ops ops;
443 static struct xp_ops2 ops2;
444
445 /* VARIABLES PROTECTED BY ops_lock: ops */
446
447 mutex_lock(&ops_lock);
448 if (ops.xp_recv == NULL) {
449 ops.xp_recv = svc_dg_recv;
450 ops.xp_stat = svc_dg_stat;
451 ops.xp_getargs = svc_dg_getargs;
452 ops.xp_reply = svc_dg_reply;
453 ops.xp_freeargs = svc_dg_freeargs;
454 ops.xp_destroy = svc_dg_destroy;
455 ops2.xp_control = svc_dg_control;
456 }
457 xprt->xp_ops = &ops;
458 xprt->xp_ops2 = &ops2;
459 mutex_unlock(&ops_lock);
460 }
461
462 /* The CACHING COMPONENT */
463
464 /*
465 * Could have been a separate file, but some part of it depends upon the
466 * private structure of the client handle.
467 *
468 * Fifo cache for cl server
469 * Copies pointers to reply buffers into fifo cache
470 * Buffers are sent again if retransmissions are detected.
471 */
472
473 #define SPARSENESS 4 /* 75% sparse */
474
475 #define ALLOC(type, size) \
476 (type *) mem_alloc((sizeof (type) * (size)))
477
478 #define MEMZERO(addr, type, size) \
479 (void) memset((void *) (addr), 0, sizeof (type) * (int) (size))
480
481 #define FREE(addr, type, size) \
482 mem_free((addr), (sizeof (type) * (size)))
483
484 /*
485 * An entry in the cache
486 */
487 typedef struct cache_node *cache_ptr;
488 struct cache_node {
489 /*
490 * Index into cache is xid, proc, vers, prog and address
491 */
492 u_int32_t cache_xid;
493 rpcproc_t cache_proc;
494 rpcvers_t cache_vers;
495 rpcprog_t cache_prog;
496 struct netbuf cache_addr;
497 /*
498 * The cached reply and length
499 */
500 char *cache_reply;
501 size_t cache_replylen;
502 /*
503 * Next node on the list, if there is a collision
504 */
505 cache_ptr cache_next;
506 };
507
508 /*
509 * The entire cache
510 */
511 struct cl_cache {
512 u_int uc_size; /* size of cache */
513 cache_ptr *uc_entries; /* hash table of entries in cache */
514 cache_ptr *uc_fifo; /* fifo list of entries in cache */
515 u_int uc_nextvictim; /* points to next victim in fifo list */
516 rpcprog_t uc_prog; /* saved program number */
517 rpcvers_t uc_vers; /* saved version number */
518 rpcproc_t uc_proc; /* saved procedure number */
519 };
520
521
522 /*
523 * the hashing function
524 */
525 #define CACHE_LOC(transp, xid) \
526 (xid % (SPARSENESS * ((struct cl_cache *) \
527 su_data(transp)->su_cache)->uc_size))
528
529 /*
530 * Enable use of the cache. Returns 1 on success, 0 on failure.
531 * Note: there is no disable.
532 */
533 static const char cache_enable_str[] = "svc_enablecache: %s %s";
534 static const char alloc_err[] = "could not allocate cache ";
535 static const char enable_err[] = "cache already enabled";
536
537 int
svc_dg_enablecache(transp,size)538 svc_dg_enablecache(transp, size)
539 SVCXPRT *transp;
540 u_int size;
541 {
542 struct svc_dg_data *su = su_data(transp);
543 struct cl_cache *uc;
544
545 mutex_lock(&dupreq_lock);
546 if (su->su_cache != NULL) {
547 (void) warnx(cache_enable_str, enable_err, " ");
548 mutex_unlock(&dupreq_lock);
549 return (0);
550 }
551 uc = ALLOC(struct cl_cache, 1);
552 if (uc == NULL) {
553 warnx(cache_enable_str, alloc_err, " ");
554 mutex_unlock(&dupreq_lock);
555 return (0);
556 }
557 uc->uc_size = size;
558 uc->uc_nextvictim = 0;
559 uc->uc_entries = ALLOC(cache_ptr, size * SPARSENESS);
560 if (uc->uc_entries == NULL) {
561 warnx(cache_enable_str, alloc_err, "data");
562 FREE(uc, struct cl_cache, 1);
563 mutex_unlock(&dupreq_lock);
564 return (0);
565 }
566 MEMZERO(uc->uc_entries, cache_ptr, size * SPARSENESS);
567 uc->uc_fifo = ALLOC(cache_ptr, size);
568 if (uc->uc_fifo == NULL) {
569 warnx(cache_enable_str, alloc_err, "fifo");
570 FREE(uc->uc_entries, cache_ptr, size * SPARSENESS);
571 FREE(uc, struct cl_cache, 1);
572 mutex_unlock(&dupreq_lock);
573 return (0);
574 }
575 MEMZERO(uc->uc_fifo, cache_ptr, size);
576 su->su_cache = (char *)(void *)uc;
577 mutex_unlock(&dupreq_lock);
578 return (1);
579 }
580
581 /*
582 * Set an entry in the cache. It assumes that the uc entry is set from
583 * the earlier call to cache_get() for the same procedure. This will always
584 * happen because cache_get() is calle by svc_dg_recv and cache_set() is called
585 * by svc_dg_reply(). All this hoopla because the right RPC parameters are
586 * not available at svc_dg_reply time.
587 */
588
589 static const char cache_set_str[] = "cache_set: %s";
590 static const char cache_set_err1[] = "victim not found";
591 static const char cache_set_err2[] = "victim alloc failed";
592 static const char cache_set_err3[] = "could not allocate new rpc buffer";
593
594 static void
cache_set(xprt,replylen)595 cache_set(xprt, replylen)
596 SVCXPRT *xprt;
597 size_t replylen;
598 {
599 cache_ptr victim;
600 cache_ptr *vicp;
601 struct svc_dg_data *su = su_data(xprt);
602 struct cl_cache *uc = (struct cl_cache *) su->su_cache;
603 u_int loc;
604 char *newbuf;
605 #ifdef RPC_CACHE_DEBUG
606 struct netconfig *nconf;
607 char *uaddr;
608 #endif
609
610 mutex_lock(&dupreq_lock);
611 /*
612 * Find space for the new entry, either by
613 * reusing an old entry, or by mallocing a new one
614 */
615 victim = uc->uc_fifo[uc->uc_nextvictim];
616 if (victim != NULL) {
617 loc = CACHE_LOC(xprt, victim->cache_xid);
618 for (vicp = &uc->uc_entries[loc];
619 *vicp != NULL && *vicp != victim;
620 vicp = &(*vicp)->cache_next)
621 ;
622 if (*vicp == NULL) {
623 warnx(cache_set_str, cache_set_err1);
624 mutex_unlock(&dupreq_lock);
625 return;
626 }
627 *vicp = victim->cache_next; /* remove from cache */
628 newbuf = victim->cache_reply;
629 } else {
630 victim = ALLOC(struct cache_node, 1);
631 if (victim == NULL) {
632 warnx(cache_set_str, cache_set_err2);
633 mutex_unlock(&dupreq_lock);
634 return;
635 }
636 newbuf = mem_alloc(su->su_iosz);
637 if (newbuf == NULL) {
638 warnx(cache_set_str, cache_set_err3);
639 FREE(victim, struct cache_node, 1);
640 mutex_unlock(&dupreq_lock);
641 return;
642 }
643 }
644
645 /*
646 * Store it away
647 */
648 #ifdef RPC_CACHE_DEBUG
649 if (nconf = getnetconfigent(xprt->xp_netid)) {
650 uaddr = taddr2uaddr(nconf, &xprt->xp_rtaddr);
651 freenetconfigent(nconf);
652 printf(
653 "cache set for xid= %x prog=%d vers=%d proc=%d for rmtaddr=%s\n",
654 su->su_xid, uc->uc_prog, uc->uc_vers,
655 uc->uc_proc, uaddr);
656 free(uaddr);
657 }
658 #endif
659 victim->cache_replylen = replylen;
660 victim->cache_reply = rpc_buffer(xprt);
661 rpc_buffer(xprt) = newbuf;
662 xdrmem_create(&(su->su_xdrs), rpc_buffer(xprt),
663 su->su_iosz, XDR_ENCODE);
664 victim->cache_xid = su->su_xid;
665 victim->cache_proc = uc->uc_proc;
666 victim->cache_vers = uc->uc_vers;
667 victim->cache_prog = uc->uc_prog;
668 victim->cache_addr = xprt->xp_rtaddr;
669 victim->cache_addr.buf = ALLOC(char, xprt->xp_rtaddr.len);
670 (void) memcpy(victim->cache_addr.buf, xprt->xp_rtaddr.buf,
671 (size_t)xprt->xp_rtaddr.len);
672 loc = CACHE_LOC(xprt, victim->cache_xid);
673 victim->cache_next = uc->uc_entries[loc];
674 uc->uc_entries[loc] = victim;
675 uc->uc_fifo[uc->uc_nextvictim++] = victim;
676 uc->uc_nextvictim %= uc->uc_size;
677 mutex_unlock(&dupreq_lock);
678 }
679
680 /*
681 * Try to get an entry from the cache
682 * return 1 if found, 0 if not found and set the stage for cache_set()
683 */
684 static int
cache_get(xprt,msg,replyp,replylenp)685 cache_get(xprt, msg, replyp, replylenp)
686 SVCXPRT *xprt;
687 struct rpc_msg *msg;
688 char **replyp;
689 size_t *replylenp;
690 {
691 u_int loc;
692 cache_ptr ent;
693 struct svc_dg_data *su = su_data(xprt);
694 struct cl_cache *uc = (struct cl_cache *) su->su_cache;
695 #ifdef RPC_CACHE_DEBUG
696 struct netconfig *nconf;
697 char *uaddr;
698 #endif
699
700 mutex_lock(&dupreq_lock);
701 loc = CACHE_LOC(xprt, su->su_xid);
702 for (ent = uc->uc_entries[loc]; ent != NULL; ent = ent->cache_next) {
703 if (ent->cache_xid == su->su_xid &&
704 ent->cache_proc == msg->rm_call.cb_proc &&
705 ent->cache_vers == msg->rm_call.cb_vers &&
706 ent->cache_prog == msg->rm_call.cb_prog &&
707 ent->cache_addr.len == xprt->xp_rtaddr.len &&
708 (memcmp(ent->cache_addr.buf, xprt->xp_rtaddr.buf,
709 xprt->xp_rtaddr.len) == 0)) {
710 #ifdef RPC_CACHE_DEBUG
711 if (nconf = getnetconfigent(xprt->xp_netid)) {
712 uaddr = taddr2uaddr(nconf, &xprt->xp_rtaddr);
713 freenetconfigent(nconf);
714 printf(
715 "cache entry found for xid=%x prog=%d vers=%d proc=%d for rmtaddr=%s\n",
716 su->su_xid, msg->rm_call.cb_prog,
717 msg->rm_call.cb_vers,
718 msg->rm_call.cb_proc, uaddr);
719 free(uaddr);
720 }
721 #endif
722 *replyp = ent->cache_reply;
723 *replylenp = ent->cache_replylen;
724 mutex_unlock(&dupreq_lock);
725 return (1);
726 }
727 }
728 /*
729 * Failed to find entry
730 * Remember a few things so we can do a set later
731 */
732 uc->uc_proc = msg->rm_call.cb_proc;
733 uc->uc_vers = msg->rm_call.cb_vers;
734 uc->uc_prog = msg->rm_call.cb_prog;
735 mutex_unlock(&dupreq_lock);
736 return (0);
737 }
738