svc_vc.c revision 1.8.2.3 1 /* $NetBSD: svc_vc.c,v 1.8.2.3 2002/03/22 20:42:24 nathanw 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 #include <sys/cdefs.h>
33 #if defined(LIBC_SCCS) && !defined(lint)
34 #if 0
35 static char *sccsid = "@(#)svc_tcp.c 1.21 87/08/11 Copyr 1984 Sun Micro";
36 static char *sccsid = "@(#)svc_tcp.c 2.2 88/08/01 4.0 RPCSRC";
37 #else
38 __RCSID("$NetBSD: svc_vc.c,v 1.8.2.3 2002/03/22 20:42:24 nathanw Exp $");
39 #endif
40 #endif
41
42 /*
43 * svc_vc.c, Server side for Connection Oriented based RPC.
44 *
45 * Actually implements two flavors of transporter -
46 * a tcp rendezvouser (a listner and connection establisher)
47 * and a record/tcp stream.
48 */
49
50 #include "namespace.h"
51 #include "reentrant.h"
52 #include <sys/types.h>
53 #include <sys/param.h>
54 #include <sys/poll.h>
55 #include <sys/socket.h>
56 #include <sys/un.h>
57 #include <netinet/in.h>
58 #include <netinet/tcp.h>
59
60 #include <assert.h>
61 #include <err.h>
62 #include <errno.h>
63 #include <stdio.h>
64 #include <stdlib.h>
65 #include <string.h>
66 #include <unistd.h>
67
68 #include <rpc/rpc.h>
69
70 #include "rpc_com.h"
71
72 #ifdef __weak_alias
73 __weak_alias(svc_fd_create,_svc_fd_create)
74 __weak_alias(svc_vc_create,_svc_vc_create)
75 #endif
76
77 static SVCXPRT *makefd_xprt __P((int, u_int, u_int));
78 static bool_t rendezvous_request __P((SVCXPRT *, struct rpc_msg *));
79 static enum xprt_stat rendezvous_stat __P((SVCXPRT *));
80 static void svc_vc_destroy __P((SVCXPRT *));
81 static int read_vc __P((caddr_t, caddr_t, int));
82 static int write_vc __P((caddr_t, caddr_t, int));
83 static enum xprt_stat svc_vc_stat __P((SVCXPRT *));
84 static bool_t svc_vc_recv __P((SVCXPRT *, struct rpc_msg *));
85 static bool_t svc_vc_getargs __P((SVCXPRT *, xdrproc_t, caddr_t));
86 static bool_t svc_vc_freeargs __P((SVCXPRT *, xdrproc_t, caddr_t));
87 static bool_t svc_vc_reply __P((SVCXPRT *, struct rpc_msg *));
88 static void svc_vc_rendezvous_ops __P((SVCXPRT *));
89 static void svc_vc_ops __P((SVCXPRT *));
90 static bool_t svc_vc_control __P((SVCXPRT *xprt, const u_int rq, void *in));
91
92 struct cf_rendezvous { /* kept in xprt->xp_p1 for rendezvouser */
93 u_int sendsize;
94 u_int recvsize;
95 };
96
97 struct cf_conn { /* kept in xprt->xp_p1 for actual connection */
98 enum xprt_stat strm_stat;
99 u_int32_t x_id;
100 XDR xdrs;
101 char verf_body[MAX_AUTH_BYTES];
102 };
103
104 /*
105 * Usage:
106 * xprt = svc_vc_create(sock, send_buf_size, recv_buf_size);
107 *
108 * Creates, registers, and returns a (rpc) tcp based transporter.
109 * Once *xprt is initialized, it is registered as a transporter
110 * see (svc.h, xprt_register). This routine returns
111 * a NULL if a problem occurred.
112 *
113 * The filedescriptor passed in is expected to refer to a bound, but
114 * not yet connected socket.
115 *
116 * Since streams do buffered io similar to stdio, the caller can specify
117 * how big the send and receive buffers are via the second and third parms;
118 * 0 => use the system default.
119 */
120 SVCXPRT *
121 svc_vc_create(fd, sendsize, recvsize)
122 int fd;
123 u_int sendsize;
124 u_int recvsize;
125 {
126 SVCXPRT *xprt;
127 struct cf_rendezvous *r = NULL;
128 struct __rpc_sockinfo si;
129 struct sockaddr_storage sslocal;
130 socklen_t slen;
131 int one = 1;
132
133 r = mem_alloc(sizeof(*r));
134 if (r == NULL) {
135 warnx("svc_vc_create: out of memory");
136 goto cleanup_svc_vc_create;
137 }
138 if (!__rpc_fd2sockinfo(fd, &si))
139 return NULL;
140 r->sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize);
141 r->recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize);
142 xprt = mem_alloc(sizeof(SVCXPRT));
143 if (xprt == NULL) {
144 warnx("svc_vc_create: out of memory");
145 goto cleanup_svc_vc_create;
146 }
147 xprt->xp_tp = NULL;
148 xprt->xp_p1 = (caddr_t)(void *)r;
149 xprt->xp_p2 = NULL;
150 xprt->xp_p3 = NULL;
151 xprt->xp_verf = _null_auth;
152 svc_vc_rendezvous_ops(xprt);
153 xprt->xp_port = (u_short)-1; /* It is the rendezvouser */
154 xprt->xp_fd = fd;
155
156 slen = sizeof (struct sockaddr_storage);
157 if (getsockname(fd, (struct sockaddr *)(void *)&sslocal, &slen) < 0) {
158 warnx("svc_vc_create: could not retrieve local addr");
159 goto cleanup_svc_vc_create;
160 }
161
162 /*
163 * We want to be able to check credentials on local sockets.
164 */
165 if (sslocal.ss_family == AF_LOCAL)
166 if (setsockopt(fd, 0, LOCAL_CREDS, &one, sizeof one) < 0)
167 goto cleanup_svc_vc_create;
168
169 xprt->xp_ltaddr.maxlen = xprt->xp_ltaddr.len = sslocal.ss_len;
170 xprt->xp_ltaddr.buf = mem_alloc((size_t)sslocal.ss_len);
171 if (xprt->xp_ltaddr.buf == NULL) {
172 warnx("svc_vc_create: no mem for local addr");
173 goto cleanup_svc_vc_create;
174 }
175 memcpy(xprt->xp_ltaddr.buf, &sslocal, (size_t)sslocal.ss_len);
176
177 xprt->xp_rtaddr.maxlen = sizeof (struct sockaddr_storage);
178 xprt_register(xprt);
179 return (xprt);
180 cleanup_svc_vc_create:
181 if (r != NULL)
182 mem_free(r, sizeof(*r));
183 return (NULL);
184 }
185
186 /*
187 * Like svtcp_create(), except the routine takes any *open* UNIX file
188 * descriptor as its first input.
189 */
190 SVCXPRT *
191 svc_fd_create(fd, sendsize, recvsize)
192 int fd;
193 u_int sendsize;
194 u_int recvsize;
195 {
196 struct sockaddr_storage ss;
197 socklen_t slen;
198 SVCXPRT *ret;
199
200 _DIAGASSERT(fd != -1);
201
202 ret = makefd_xprt(fd, sendsize, recvsize);
203 if (ret == NULL)
204 return NULL;
205
206 slen = sizeof (struct sockaddr_storage);
207 if (getsockname(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) {
208 warnx("svc_fd_create: could not retrieve local addr");
209 goto freedata;
210 }
211 ret->xp_ltaddr.maxlen = ret->xp_ltaddr.len = ss.ss_len;
212 ret->xp_ltaddr.buf = mem_alloc((size_t)ss.ss_len);
213 if (ret->xp_ltaddr.buf == NULL) {
214 warnx("svc_fd_create: no mem for local addr");
215 goto freedata;
216 }
217 memcpy(ret->xp_ltaddr.buf, &ss, (size_t)ss.ss_len);
218
219 slen = sizeof (struct sockaddr_storage);
220 if (getpeername(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) {
221 warnx("svc_fd_create: could not retrieve remote addr");
222 goto freedata;
223 }
224 ret->xp_rtaddr.maxlen = ret->xp_rtaddr.len = ss.ss_len;
225 ret->xp_rtaddr.buf = mem_alloc((size_t)ss.ss_len);
226 if (ret->xp_rtaddr.buf == NULL) {
227 warnx("svc_fd_create: no mem for local addr");
228 goto freedata;
229 }
230 memcpy(ret->xp_rtaddr.buf, &ss, (size_t)ss.ss_len);
231 #ifdef PORTMAP
232 if (ss.ss_family == AF_INET) {
233 ret->xp_raddr = *(struct sockaddr_in *)ret->xp_rtaddr.buf;
234 ret->xp_addrlen = sizeof (struct sockaddr_in);
235 }
236 #endif
237
238 return ret;
239
240 freedata:
241 if (ret->xp_ltaddr.buf != NULL)
242 mem_free(ret->xp_ltaddr.buf, rep->xp_ltaddr.maxlen);
243
244 return NULL;
245 }
246
247 static SVCXPRT *
248 makefd_xprt(fd, sendsize, recvsize)
249 int fd;
250 u_int sendsize;
251 u_int recvsize;
252 {
253 SVCXPRT *xprt;
254 struct cf_conn *cd;
255 const char *netid;
256 struct __rpc_sockinfo si;
257
258 _DIAGASSERT(fd != -1);
259
260 xprt = mem_alloc(sizeof(SVCXPRT));
261 if (xprt == NULL) {
262 warnx("svc_vc: makefd_xprt: out of memory");
263 goto done;
264 }
265 memset(xprt, 0, sizeof *xprt);
266 cd = mem_alloc(sizeof(struct cf_conn));
267 if (cd == NULL) {
268 warnx("svc_tcp: makefd_xprt: out of memory");
269 mem_free(xprt, sizeof(SVCXPRT));
270 xprt = NULL;
271 goto done;
272 }
273 cd->strm_stat = XPRT_IDLE;
274 xdrrec_create(&(cd->xdrs), sendsize, recvsize,
275 (caddr_t)(void *)xprt, read_vc, write_vc);
276 xprt->xp_p1 = (caddr_t)(void *)cd;
277 xprt->xp_verf.oa_base = cd->verf_body;
278 svc_vc_ops(xprt); /* truely deals with calls */
279 xprt->xp_port = 0; /* this is a connection, not a rendezvouser */
280 xprt->xp_fd = fd;
281 if (__rpc_fd2sockinfo(fd, &si) && __rpc_sockinfo2netid(&si, &netid))
282 xprt->xp_netid = strdup(netid);
283
284 xprt_register(xprt);
285 done:
286 return (xprt);
287 }
288
289 /*ARGSUSED*/
290 static bool_t
291 rendezvous_request(xprt, msg)
292 SVCXPRT *xprt;
293 struct rpc_msg *msg;
294 {
295 int sock;
296 struct cf_rendezvous *r;
297 struct sockaddr_storage addr;
298 socklen_t len;
299 struct __rpc_sockinfo si;
300
301 _DIAGASSERT(xprt != NULL);
302 _DIAGASSERT(msg != NULL);
303
304 r = (struct cf_rendezvous *)xprt->xp_p1;
305 again:
306 len = sizeof addr;
307 if ((sock = accept(xprt->xp_fd, (struct sockaddr *)(void *)&addr,
308 &len)) < 0) {
309 if (errno == EINTR)
310 goto again;
311 return (FALSE);
312 }
313 /*
314 * make a new transporter (re-uses xprt)
315 */
316 xprt = makefd_xprt(sock, r->sendsize, r->recvsize);
317 xprt->xp_rtaddr.buf = mem_alloc(len);
318 if (xprt->xp_rtaddr.buf == NULL)
319 return (FALSE);
320 memcpy(xprt->xp_rtaddr.buf, &addr, len);
321 xprt->xp_rtaddr.len = len;
322 #ifdef PORTMAP
323 if (addr.ss_family == AF_INET) {
324 xprt->xp_raddr = *(struct sockaddr_in *)xprt->xp_rtaddr.buf;
325 xprt->xp_addrlen = sizeof (struct sockaddr_in);
326 }
327 #endif
328 if (__rpc_fd2sockinfo(sock, &si) && si.si_proto == IPPROTO_TCP) {
329 len = 1;
330 /* XXX fvdl - is this useful? */
331 setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &len, sizeof (len));
332 }
333 return (FALSE); /* there is never an rpc msg to be processed */
334 }
335
336 /*ARGSUSED*/
337 static enum xprt_stat
338 rendezvous_stat(xprt)
339 SVCXPRT *xprt;
340 {
341
342 return (XPRT_IDLE);
343 }
344
345 static void
346 svc_vc_destroy(xprt)
347 SVCXPRT *xprt;
348 {
349 struct cf_conn *cd;
350 struct cf_rendezvous *r;
351
352 _DIAGASSERT(xprt != NULL);
353
354 cd = (struct cf_conn *)xprt->xp_p1;
355
356 xprt_unregister(xprt);
357 if (xprt->xp_fd != RPC_ANYFD)
358 (void)close(xprt->xp_fd);
359 if (xprt->xp_port != 0) {
360 /* a rendezvouser socket */
361 r = (struct cf_rendezvous *)xprt->xp_p1;
362 mem_free(r, sizeof (struct cf_rendezvous));
363 xprt->xp_port = 0;
364 } else {
365 /* an actual connection socket */
366 XDR_DESTROY(&(cd->xdrs));
367 mem_free(cd, sizeof(struct cf_conn));
368 }
369 if (xprt->xp_rtaddr.buf)
370 mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.maxlen);
371 if (xprt->xp_ltaddr.buf)
372 mem_free(xprt->xp_ltaddr.buf, xprt->xp_ltaddr.maxlen);
373 if (xprt->xp_tp)
374 free(xprt->xp_tp);
375 if (xprt->xp_netid)
376 free(xprt->xp_netid);
377 mem_free(xprt, sizeof(SVCXPRT));
378 }
379
380 /*ARGSUSED*/
381 static bool_t
382 svc_vc_control(xprt, rq, in)
383 SVCXPRT *xprt;
384 const u_int rq;
385 void *in;
386 {
387 return (FALSE);
388 }
389
390 /*
391 * reads data from the tcp connection.
392 * any error is fatal and the connection is closed.
393 * (And a read of zero bytes is a half closed stream => error.)
394 * All read operations timeout after 35 seconds. A timeout is
395 * fatal for the connection.
396 */
397 static int
398 read_vc(xprtp, buf, len)
399 caddr_t xprtp;
400 caddr_t buf;
401 int len;
402 {
403 SVCXPRT *xprt;
404 int sock;
405 int milliseconds = 35 * 1000;
406 struct pollfd pollfd;
407 struct sockaddr *sa;
408 struct msghdr msg;
409 struct cmsghdr *cmp;
410 void *crmsg = NULL;
411 struct sockcred *sc;
412 socklen_t crmsgsize;
413
414 xprt = (SVCXPRT *)(void *)xprtp;
415 _DIAGASSERT(xprt != NULL);
416
417 sock = xprt->xp_fd;
418
419 sa = (struct sockaddr *)xprt->xp_rtaddr.buf;
420 if (sa->sa_family == AF_LOCAL && xprt->xp_p2 == NULL) {
421 memset(&msg, 0, sizeof msg);
422 crmsgsize = CMSG_SPACE(SOCKCREDSIZE(NGROUPS));
423 crmsg = malloc(crmsgsize);
424 if (crmsg == NULL)
425 goto fatal_err;
426 memset(crmsg, 0, crmsgsize);
427
428 msg.msg_control = crmsg;
429 msg.msg_controllen = crmsgsize;
430
431 if (recvmsg(sock, &msg, 0) < 0)
432 goto fatal_err;
433
434 if (msg.msg_controllen == 0 ||
435 (msg.msg_flags & MSG_CTRUNC) != 0)
436 goto fatal_err;
437
438 cmp = CMSG_FIRSTHDR(&msg);
439 if (cmp->cmsg_level != SOL_SOCKET ||
440 cmp->cmsg_type != SCM_CREDS)
441 goto fatal_err;
442
443 sc = (struct sockcred *)(void *)CMSG_DATA(cmp);
444
445 xprt->xp_p2 = mem_alloc(SOCKCREDSIZE(sc->sc_ngroups));
446 if (xprt->xp_p2 == NULL)
447 goto fatal_err;
448
449 memcpy(xprt->xp_p2, sc, SOCKCREDSIZE(sc->sc_ngroups));
450 free(crmsg);
451 crmsg = NULL;
452 }
453
454 do {
455 pollfd.fd = sock;
456 pollfd.events = POLLIN;
457 switch (poll(&pollfd, 1, milliseconds)) {
458 case -1:
459 if (errno == EINTR) {
460 continue;
461 }
462 /*FALLTHROUGH*/
463 case 0:
464 goto fatal_err;
465
466 default:
467 break;
468 }
469 } while ((pollfd.revents & POLLIN) == 0);
470
471 if ((len = read(sock, buf, (size_t)len)) > 0)
472 return (len);
473
474 fatal_err:
475 if (crmsg != NULL)
476 free(crmsg);
477 ((struct cf_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;
478 return (-1);
479 }
480
481 /*
482 * writes data to the tcp connection.
483 * Any error is fatal and the connection is closed.
484 */
485 static int
486 write_vc(xprtp, buf, len)
487 caddr_t xprtp;
488 caddr_t buf;
489 int len;
490 {
491 SVCXPRT *xprt;
492 int i, cnt;
493
494 xprt = (SVCXPRT *)(void *)xprtp;
495 _DIAGASSERT(xprt != NULL);
496
497 for (cnt = len; cnt > 0; cnt -= i, buf += i) {
498 if ((i = write(xprt->xp_fd, buf, (size_t)cnt)) < 0) {
499 ((struct cf_conn *)(xprt->xp_p1))->strm_stat =
500 XPRT_DIED;
501 return (-1);
502 }
503 }
504 return (len);
505 }
506
507 static enum xprt_stat
508 svc_vc_stat(xprt)
509 SVCXPRT *xprt;
510 {
511 struct cf_conn *cd;
512
513 _DIAGASSERT(xprt != NULL);
514
515 cd = (struct cf_conn *)(xprt->xp_p1);
516
517 if (cd->strm_stat == XPRT_DIED)
518 return (XPRT_DIED);
519 if (! xdrrec_eof(&(cd->xdrs)))
520 return (XPRT_MOREREQS);
521 return (XPRT_IDLE);
522 }
523
524 static bool_t
525 svc_vc_recv(xprt, msg)
526 SVCXPRT *xprt;
527 struct rpc_msg *msg;
528 {
529 struct cf_conn *cd;
530 XDR *xdrs;
531
532 _DIAGASSERT(xprt != NULL);
533 _DIAGASSERT(msg != NULL);
534
535 cd = (struct cf_conn *)(xprt->xp_p1);
536 xdrs = &(cd->xdrs);
537
538 xdrs->x_op = XDR_DECODE;
539 (void)xdrrec_skiprecord(xdrs);
540 if (xdr_callmsg(xdrs, msg)) {
541 cd->x_id = msg->rm_xid;
542 return (TRUE);
543 }
544 cd->strm_stat = XPRT_DIED;
545 return (FALSE);
546 }
547
548 static bool_t
549 svc_vc_getargs(xprt, xdr_args, args_ptr)
550 SVCXPRT *xprt;
551 xdrproc_t xdr_args;
552 caddr_t args_ptr;
553 {
554
555 _DIAGASSERT(xprt != NULL);
556 /* args_ptr may be NULL */
557
558 return ((*xdr_args)(&(((struct cf_conn *)(xprt->xp_p1))->xdrs),
559 args_ptr));
560 }
561
562 static bool_t
563 svc_vc_freeargs(xprt, xdr_args, args_ptr)
564 SVCXPRT *xprt;
565 xdrproc_t xdr_args;
566 caddr_t args_ptr;
567 {
568 XDR *xdrs;
569
570 _DIAGASSERT(xprt != NULL);
571 /* args_ptr may be NULL */
572
573 xdrs = &(((struct cf_conn *)(xprt->xp_p1))->xdrs);
574
575 xdrs->x_op = XDR_FREE;
576 return ((*xdr_args)(xdrs, args_ptr));
577 }
578
579 static bool_t
580 svc_vc_reply(xprt, msg)
581 SVCXPRT *xprt;
582 struct rpc_msg *msg;
583 {
584 struct cf_conn *cd;
585 XDR *xdrs;
586 bool_t stat;
587
588 _DIAGASSERT(xprt != NULL);
589 _DIAGASSERT(msg != NULL);
590
591 cd = (struct cf_conn *)(xprt->xp_p1);
592 xdrs = &(cd->xdrs);
593
594 xdrs->x_op = XDR_ENCODE;
595 msg->rm_xid = cd->x_id;
596 stat = xdr_replymsg(xdrs, msg);
597 (void)xdrrec_endofrecord(xdrs, TRUE);
598 return (stat);
599 }
600
601 static void
602 svc_vc_ops(xprt)
603 SVCXPRT *xprt;
604 {
605 static struct xp_ops ops;
606 static struct xp_ops2 ops2;
607 #ifdef _REENTRANT
608 extern mutex_t ops_lock;
609 #endif
610
611 /* VARIABLES PROTECTED BY ops_lock: ops, ops2 */
612
613 mutex_lock(&ops_lock);
614 if (ops.xp_recv == NULL) {
615 ops.xp_recv = svc_vc_recv;
616 ops.xp_stat = svc_vc_stat;
617 ops.xp_getargs = svc_vc_getargs;
618 ops.xp_reply = svc_vc_reply;
619 ops.xp_freeargs = svc_vc_freeargs;
620 ops.xp_destroy = svc_vc_destroy;
621 ops2.xp_control = svc_vc_control;
622 }
623 xprt->xp_ops = &ops;
624 xprt->xp_ops2 = &ops2;
625 mutex_unlock(&ops_lock);
626 }
627
628 static void
629 svc_vc_rendezvous_ops(xprt)
630 SVCXPRT *xprt;
631 {
632 static struct xp_ops ops;
633 static struct xp_ops2 ops2;
634 #ifdef _REENTRANT
635 extern mutex_t ops_lock;
636 #endif
637
638 mutex_lock(&ops_lock);
639 if (ops.xp_recv == NULL) {
640 ops.xp_recv = rendezvous_request;
641 ops.xp_stat = rendezvous_stat;
642 ops.xp_getargs =
643 (bool_t (*) __P((SVCXPRT *, xdrproc_t, caddr_t)))abort;
644 ops.xp_reply =
645 (bool_t (*) __P((SVCXPRT *, struct rpc_msg *)))abort;
646 ops.xp_freeargs =
647 (bool_t (*) __P((SVCXPRT *, xdrproc_t, caddr_t)))abort,
648 ops.xp_destroy = svc_vc_destroy;
649 ops2.xp_control = svc_vc_control;
650 }
651 xprt->xp_ops = &ops;
652 xprt->xp_ops2 = &ops2;
653 mutex_unlock(&ops_lock);
654 }
655