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sys/rpc/clnt_vc.c
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1 /* $NetBSD: clnt_vc.c,v 1.4 2000/07/14 08:40:42 fvdl 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 #if defined(LIBC_SCCS) && !defined(lint) 33 static char *sccsid2 = "@(#)clnt_tcp.c 1.37 87/10/05 Copyr 1984 Sun Micro"; 34 static char *sccsid = "@(#)clnt_tcp.c 2.2 88/08/01 4.0 RPCSRC"; 35 static char sccsid3[] = "@(#)clnt_vc.c 1.19 89/03/16 Copyr 1988 Sun Micro"; 36 #endif 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD: releng/8.0/sys/rpc/clnt_vc.c 201679 2010-01-06 21:45:30Z simon $"); 39 40 /* 41 * clnt_tcp.c, Implements a TCP/IP based, client side RPC. 42 * 43 * Copyright (C) 1984, Sun Microsystems, Inc. 44 * 45 * TCP based RPC supports 'batched calls'. 46 * A sequence of calls may be batched-up in a send buffer. The rpc call 47 * return immediately to the client even though the call was not necessarily 48 * sent. The batching occurs if the results' xdr routine is NULL (0) AND 49 * the rpc timeout value is zero (see clnt.h, rpc). 50 * 51 * Clients should NOT casually batch calls that in fact return results; that is, 52 * the server side should be aware that a call is batched and not produce any 53 * return message. Batched calls that produce many result messages can 54 * deadlock (netlock) the client and the server.... 55 * 56 * Now go hang yourself. 57 */ 58 59 #include <sys/param.h> 60 #include <sys/systm.h> 61 #include <sys/lock.h> 62 #include <sys/malloc.h> 63 #include <sys/mbuf.h> 64 #include <sys/mutex.h> 65 #include <sys/pcpu.h> 66 #include <sys/proc.h> 67 #include <sys/protosw.h> 68 #include <sys/socket.h> 69 #include <sys/socketvar.h> 70 #include <sys/syslog.h> 71 #include <sys/time.h> 72 #include <sys/uio.h> 73 74 #include <net/vnet.h> 75 76 #include <netinet/tcp.h> 77 78 #include <rpc/rpc.h> 79 #include <rpc/rpc_com.h> 80 81 #define MCALL_MSG_SIZE 24 82 83 struct cmessage { 84 struct cmsghdr cmsg; 85 struct cmsgcred cmcred; 86 }; 87 88 static enum clnt_stat clnt_vc_call(CLIENT *, struct rpc_callextra *, 89 rpcproc_t, struct mbuf *, struct mbuf **, struct timeval); 90 static void clnt_vc_geterr(CLIENT *, struct rpc_err *); 91 static bool_t clnt_vc_freeres(CLIENT *, xdrproc_t, void *); 92 static void clnt_vc_abort(CLIENT *); 93 static bool_t clnt_vc_control(CLIENT *, u_int, void *); 94 static void clnt_vc_close(CLIENT *); 95 static void clnt_vc_destroy(CLIENT *); 96 static bool_t time_not_ok(struct timeval *); 97 static int clnt_vc_soupcall(struct socket *so, void *arg, int waitflag); 98 99 static struct clnt_ops clnt_vc_ops = { 100 .cl_call = clnt_vc_call, 101 .cl_abort = clnt_vc_abort, 102 .cl_geterr = clnt_vc_geterr, 103 .cl_freeres = clnt_vc_freeres, 104 .cl_close = clnt_vc_close, 105 .cl_destroy = clnt_vc_destroy, 106 .cl_control = clnt_vc_control 107 }; 108 109 /* 110 * A pending RPC request which awaits a reply. Requests which have 111 * received their reply will have cr_xid set to zero and cr_mrep to 112 * the mbuf chain of the reply. 113 */ 114 struct ct_request { 115 TAILQ_ENTRY(ct_request) cr_link; 116 uint32_t cr_xid; /* XID of request */ 117 struct mbuf *cr_mrep; /* reply received by upcall */ 118 int cr_error; /* any error from upcall */ 119 char cr_verf[MAX_AUTH_BYTES]; /* reply verf */ 120 }; 121 122 TAILQ_HEAD(ct_request_list, ct_request); 123 124 struct ct_data { 125 struct mtx ct_lock; 126 int ct_threads; /* number of threads in clnt_vc_call */ 127 bool_t ct_closing; /* TRUE if we are closing */ 128 bool_t ct_closed; /* TRUE if we are closed */ 129 struct socket *ct_socket; /* connection socket */ 130 bool_t ct_closeit; /* close it on destroy */ 131 struct timeval ct_wait; /* wait interval in milliseconds */ 132 struct sockaddr_storage ct_addr; /* remote addr */ 133 struct rpc_err ct_error; 134 uint32_t ct_xid; 135 char ct_mcallc[MCALL_MSG_SIZE]; /* marshalled callmsg */ 136 size_t ct_mpos; /* pos after marshal */ 137 const char *ct_waitchan; 138 int ct_waitflag; 139 struct mbuf *ct_record; /* current reply record */ 140 size_t ct_record_resid; /* how much left of reply to read */ 141 bool_t ct_record_eor; /* true if reading last fragment */ 142 struct ct_request_list ct_pending; 143 int ct_upcallrefs; /* Ref cnt of upcalls in prog. */ 144 }; 145 146 static void clnt_vc_upcallsdone(struct ct_data *); 147 148 static const char clnt_vc_errstr[] = "%s : %s"; 149 static const char clnt_vc_str[] = "clnt_vc_create"; 150 static const char clnt_read_vc_str[] = "read_vc"; 151 static const char __no_mem_str[] = "out of memory"; 152 153 /* 154 * Create a client handle for a connection. 155 * Default options are set, which the user can change using clnt_control()'s. 156 * The rpc/vc package does buffering similar to stdio, so the client 157 * must pick send and receive buffer sizes, 0 => use the default. 158 * NB: fd is copied into a private area. 159 * NB: The rpch->cl_auth is set null authentication. Caller may wish to 160 * set this something more useful. 161 * 162 * fd should be an open socket 163 */ 164 CLIENT * 165 clnt_vc_create( 166 struct socket *so, /* open file descriptor */ 167 struct sockaddr *raddr, /* servers address */ 168 const rpcprog_t prog, /* program number */ 169 const rpcvers_t vers, /* version number */ 170 size_t sendsz, /* buffer recv size */ 171 size_t recvsz) /* buffer send size */ 172 { 173 CLIENT *cl; /* client handle */ 174 struct ct_data *ct = NULL; /* client handle */ 175 struct timeval now; 176 struct rpc_msg call_msg; 177 static uint32_t disrupt; 178 struct __rpc_sockinfo si; 179 XDR xdrs; 180 int error, interrupted, one = 1; 181 struct sockopt sopt; 182 183 if (disrupt == 0) 184 disrupt = (uint32_t)(long)raddr; 185 186 cl = (CLIENT *)mem_alloc(sizeof (*cl)); 187 ct = (struct ct_data *)mem_alloc(sizeof (*ct)); 188 189 mtx_init(&ct->ct_lock, "ct->ct_lock", NULL, MTX_DEF); 190 ct->ct_threads = 0; 191 ct->ct_closing = FALSE; 192 ct->ct_closed = FALSE; 193 ct->ct_upcallrefs = 0; 194 195 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) { 196 error = soconnect(so, raddr, curthread); 197 SOCK_LOCK(so); 198 interrupted = 0; 199 while ((so->so_state & SS_ISCONNECTING) 200 && so->so_error == 0) { 201 error = msleep(&so->so_timeo, SOCK_MTX(so), 202 PSOCK | PCATCH | PBDRY, "connec", 0); 203 if (error) { 204 if (error == EINTR || error == ERESTART) 205 interrupted = 1; 206 break; 207 } 208 } 209 if (error == 0) { 210 error = so->so_error; 211 so->so_error = 0; 212 } 213 SOCK_UNLOCK(so); 214 if (error) { 215 if (!interrupted) 216 so->so_state &= ~SS_ISCONNECTING; 217 rpc_createerr.cf_stat = RPC_SYSTEMERROR; 218 rpc_createerr.cf_error.re_errno = error; 219 goto err; 220 } 221 } 222 223 CURVNET_SET(so->so_vnet); 224 if (!__rpc_socket2sockinfo(so, &si)) { 225 CURVNET_RESTORE(); 226 goto err; 227 } 228 229 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 230 bzero(&sopt, sizeof(sopt)); 231 sopt.sopt_dir = SOPT_SET; 232 sopt.sopt_level = SOL_SOCKET; 233 sopt.sopt_name = SO_KEEPALIVE; 234 sopt.sopt_val = &one; 235 sopt.sopt_valsize = sizeof(one); 236 sosetopt(so, &sopt); 237 } 238 239 if (so->so_proto->pr_protocol == IPPROTO_TCP) { 240 bzero(&sopt, sizeof(sopt)); 241 sopt.sopt_dir = SOPT_SET; 242 sopt.sopt_level = IPPROTO_TCP; 243 sopt.sopt_name = TCP_NODELAY; 244 sopt.sopt_val = &one; 245 sopt.sopt_valsize = sizeof(one); 246 sosetopt(so, &sopt); 247 } 248 CURVNET_RESTORE(); 249 250 ct->ct_closeit = FALSE; 251 252 /* 253 * Set up private data struct 254 */ 255 ct->ct_socket = so; 256 ct->ct_wait.tv_sec = -1; 257 ct->ct_wait.tv_usec = -1; 258 memcpy(&ct->ct_addr, raddr, raddr->sa_len); 259 260 /* 261 * Initialize call message 262 */ 263 getmicrotime(&now); 264 ct->ct_xid = ((uint32_t)++disrupt) ^ __RPC_GETXID(&now); 265 call_msg.rm_xid = ct->ct_xid; 266 call_msg.rm_direction = CALL; 267 call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; 268 call_msg.rm_call.cb_prog = (uint32_t)prog; 269 call_msg.rm_call.cb_vers = (uint32_t)vers; 270 271 /* 272 * pre-serialize the static part of the call msg and stash it away 273 */ 274 xdrmem_create(&xdrs, ct->ct_mcallc, MCALL_MSG_SIZE, 275 XDR_ENCODE); 276 if (! xdr_callhdr(&xdrs, &call_msg)) { 277 if (ct->ct_closeit) { 278 soclose(ct->ct_socket); 279 } 280 goto err; 281 } 282 ct->ct_mpos = XDR_GETPOS(&xdrs); 283 XDR_DESTROY(&xdrs); 284 ct->ct_waitchan = "rpcrecv"; 285 ct->ct_waitflag = 0; 286 287 /* 288 * Create a client handle which uses xdrrec for serialization 289 * and authnone for authentication. 290 */ 291 cl->cl_refs = 1; 292 cl->cl_ops = &clnt_vc_ops; 293 cl->cl_private = ct; 294 cl->cl_auth = authnone_create(); 295 sendsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsz); 296 recvsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsz); 297 soreserve(ct->ct_socket, sendsz, recvsz); 298 299 SOCKBUF_LOCK(&ct->ct_socket->so_rcv); 300 soupcall_set(ct->ct_socket, SO_RCV, clnt_vc_soupcall, ct); 301 SOCKBUF_UNLOCK(&ct->ct_socket->so_rcv); 302 303 ct->ct_record = NULL; 304 ct->ct_record_resid = 0; 305 TAILQ_INIT(&ct->ct_pending); 306 return (cl); 307 308 err: 309 if (cl) { 310 if (ct) { 311 mtx_destroy(&ct->ct_lock); 312 mem_free(ct, sizeof (struct ct_data)); 313 } 314 if (cl) 315 mem_free(cl, sizeof (CLIENT)); 316 } 317 return ((CLIENT *)NULL); 318 } 319 320 static enum clnt_stat 321 clnt_vc_call( 322 CLIENT *cl, /* client handle */ 323 struct rpc_callextra *ext, /* call metadata */ 324 rpcproc_t proc, /* procedure number */ 325 struct mbuf *args, /* pointer to args */ 326 struct mbuf **resultsp, /* pointer to results */ 327 struct timeval utimeout) 328 { 329 struct ct_data *ct = (struct ct_data *) cl->cl_private; 330 AUTH *auth; 331 struct rpc_err *errp; 332 enum clnt_stat stat; 333 XDR xdrs; 334 struct rpc_msg reply_msg; 335 bool_t ok; 336 int nrefreshes = 2; /* number of times to refresh cred */ 337 struct timeval timeout; 338 uint32_t xid; 339 struct mbuf *mreq = NULL, *results; 340 struct ct_request *cr; 341 int error; 342 343 cr = malloc(sizeof(struct ct_request), M_RPC, M_WAITOK); 344 345 mtx_lock(&ct->ct_lock); 346 347 if (ct->ct_closing || ct->ct_closed) { 348 mtx_unlock(&ct->ct_lock); 349 free(cr, M_RPC); 350 return (RPC_CANTSEND); 351 } 352 ct->ct_threads++; 353 354 if (ext) { 355 auth = ext->rc_auth; 356 errp = &ext->rc_err; 357 } else { 358 auth = cl->cl_auth; 359 errp = &ct->ct_error; 360 } 361 362 cr->cr_mrep = NULL; 363 cr->cr_error = 0; 364 365 if (ct->ct_wait.tv_usec == -1) { 366 timeout = utimeout; /* use supplied timeout */ 367 } else { 368 timeout = ct->ct_wait; /* use default timeout */ 369 } 370 371 call_again: 372 mtx_assert(&ct->ct_lock, MA_OWNED); 373 374 ct->ct_xid++; 375 xid = ct->ct_xid; 376 377 mtx_unlock(&ct->ct_lock); 378 379 /* 380 * Leave space to pre-pend the record mark. 381 */ 382 MGETHDR(mreq, M_WAIT, MT_DATA); 383 mreq->m_data += sizeof(uint32_t); 384 KASSERT(ct->ct_mpos + sizeof(uint32_t) <= MHLEN, 385 ("RPC header too big")); 386 bcopy(ct->ct_mcallc, mreq->m_data, ct->ct_mpos); 387 mreq->m_len = ct->ct_mpos; 388 389 /* 390 * The XID is the first thing in the request. 391 */ 392 *mtod(mreq, uint32_t *) = htonl(xid); 393 394 xdrmbuf_create(&xdrs, mreq, XDR_ENCODE); 395 396 errp->re_status = stat = RPC_SUCCESS; 397 398 if ((! XDR_PUTINT32(&xdrs, &proc)) || 399 (! AUTH_MARSHALL(auth, xid, &xdrs, 400 m_copym(args, 0, M_COPYALL, M_WAITOK)))) { 401 errp->re_status = stat = RPC_CANTENCODEARGS; 402 mtx_lock(&ct->ct_lock); 403 goto out; 404 } 405 mreq->m_pkthdr.len = m_length(mreq, NULL); 406 407 /* 408 * Prepend a record marker containing the packet length. 409 */ 410 M_PREPEND(mreq, sizeof(uint32_t), M_WAIT); 411 *mtod(mreq, uint32_t *) = 412 htonl(0x80000000 | (mreq->m_pkthdr.len - sizeof(uint32_t))); 413 414 cr->cr_xid = xid; 415 mtx_lock(&ct->ct_lock); 416 /* 417 * Check to see if the other end has already started to close down 418 * the connection. The upcall will have set ct_error.re_status 419 * to RPC_CANTRECV if this is the case. 420 * If the other end starts to close down the connection after this 421 * point, it will be detected later when cr_error is checked, 422 * since the request is in the ct_pending queue. 423 */ 424 if (ct->ct_error.re_status == RPC_CANTRECV) { 425 if (errp != &ct->ct_error) { 426 errp->re_errno = ct->ct_error.re_errno; 427 errp->re_status = RPC_CANTRECV; 428 } 429 stat = RPC_CANTRECV; 430 goto out; 431 } 432 TAILQ_INSERT_TAIL(&ct->ct_pending, cr, cr_link); 433 mtx_unlock(&ct->ct_lock); 434 435 /* 436 * sosend consumes mreq. 437 */ 438 error = sosend(ct->ct_socket, NULL, NULL, mreq, NULL, 0, curthread); 439 mreq = NULL; 440 if (error == EMSGSIZE) { 441 SOCKBUF_LOCK(&ct->ct_socket->so_snd); 442 sbwait(&ct->ct_socket->so_snd); 443 SOCKBUF_UNLOCK(&ct->ct_socket->so_snd); 444 AUTH_VALIDATE(auth, xid, NULL, NULL); 445 mtx_lock(&ct->ct_lock); 446 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link); 447 goto call_again; 448 } 449 450 reply_msg.acpted_rply.ar_verf.oa_flavor = AUTH_NULL; 451 reply_msg.acpted_rply.ar_verf.oa_base = cr->cr_verf; 452 reply_msg.acpted_rply.ar_verf.oa_length = 0; 453 reply_msg.acpted_rply.ar_results.where = NULL; 454 reply_msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void; 455 456 mtx_lock(&ct->ct_lock); 457 if (error) { 458 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link); 459 errp->re_errno = error; 460 errp->re_status = stat = RPC_CANTSEND; 461 goto out; 462 } 463 464 /* 465 * Check to see if we got an upcall while waiting for the 466 * lock. In both these cases, the request has been removed 467 * from ct->ct_pending. 468 */ 469 if (cr->cr_error) { 470 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link); 471 errp->re_errno = cr->cr_error; 472 errp->re_status = stat = RPC_CANTRECV; 473 goto out; 474 } 475 if (cr->cr_mrep) { 476 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link); 477 goto got_reply; 478 } 479 480 /* 481 * Hack to provide rpc-based message passing 482 */ 483 if (timeout.tv_sec == 0 && timeout.tv_usec == 0) { 484 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link); 485 errp->re_status = stat = RPC_TIMEDOUT; 486 goto out; 487 } 488 489 error = msleep(cr, &ct->ct_lock, ct->ct_waitflag, ct->ct_waitchan, 490 tvtohz(&timeout)); 491 492 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link); 493 494 if (error) { 495 /* 496 * The sleep returned an error so our request is still 497 * on the list. Turn the error code into an 498 * appropriate client status. 499 */ 500 errp->re_errno = error; 501 switch (error) { 502 case EINTR: 503 case ERESTART: 504 stat = RPC_INTR; 505 break; 506 case EWOULDBLOCK: 507 stat = RPC_TIMEDOUT; 508 break; 509 default: 510 stat = RPC_CANTRECV; 511 } 512 errp->re_status = stat; 513 goto out; 514 } else { 515 /* 516 * We were woken up by the upcall. If the 517 * upcall had a receive error, report that, 518 * otherwise we have a reply. 519 */ 520 if (cr->cr_error) { 521 errp->re_errno = cr->cr_error; 522 errp->re_status = stat = RPC_CANTRECV; 523 goto out; 524 } 525 } 526 527 got_reply: 528 /* 529 * Now decode and validate the response. We need to drop the 530 * lock since xdr_replymsg may end up sleeping in malloc. 531 */ 532 mtx_unlock(&ct->ct_lock); 533 534 if (ext && ext->rc_feedback) 535 ext->rc_feedback(FEEDBACK_OK, proc, ext->rc_feedback_arg); 536 537 xdrmbuf_create(&xdrs, cr->cr_mrep, XDR_DECODE); 538 ok = xdr_replymsg(&xdrs, &reply_msg); 539 cr->cr_mrep = NULL; 540 541 if (ok) { 542 if ((reply_msg.rm_reply.rp_stat == MSG_ACCEPTED) && 543 (reply_msg.acpted_rply.ar_stat == SUCCESS)) 544 errp->re_status = stat = RPC_SUCCESS; 545 else 546 stat = _seterr_reply(&reply_msg, errp); 547 548 if (stat == RPC_SUCCESS) { 549 results = xdrmbuf_getall(&xdrs); 550 if (!AUTH_VALIDATE(auth, xid, 551 &reply_msg.acpted_rply.ar_verf, 552 &results)) { 553 errp->re_status = stat = RPC_AUTHERROR; 554 errp->re_why = AUTH_INVALIDRESP; 555 } else { 556 KASSERT(results, 557 ("auth validated but no result")); 558 *resultsp = results; 559 } 560 } /* end successful completion */ 561 /* 562 * If unsuccesful AND error is an authentication error 563 * then refresh credentials and try again, else break 564 */ 565 else if (stat == RPC_AUTHERROR) 566 /* maybe our credentials need to be refreshed ... */ 567 if (nrefreshes > 0 && 568 AUTH_REFRESH(auth, &reply_msg)) { 569 nrefreshes--; 570 XDR_DESTROY(&xdrs); 571 mtx_lock(&ct->ct_lock); 572 goto call_again; 573 } 574 /* end of unsuccessful completion */ 575 } /* end of valid reply message */ 576 else { 577 errp->re_status = stat = RPC_CANTDECODERES; 578 } 579 XDR_DESTROY(&xdrs); 580 mtx_lock(&ct->ct_lock); 581 out: 582 mtx_assert(&ct->ct_lock, MA_OWNED); 583 584 KASSERT(stat != RPC_SUCCESS || *resultsp, 585 ("RPC_SUCCESS without reply")); 586 587 if (mreq) 588 m_freem(mreq); 589 if (cr->cr_mrep) 590 m_freem(cr->cr_mrep); 591 592 ct->ct_threads--; 593 if (ct->ct_closing) 594 wakeup(ct); 595 596 mtx_unlock(&ct->ct_lock); 597 598 if (auth && stat != RPC_SUCCESS) 599 AUTH_VALIDATE(auth, xid, NULL, NULL); 600 601 free(cr, M_RPC); 602 603 return (stat); 604 } 605 606 static void 607 clnt_vc_geterr(CLIENT *cl, struct rpc_err *errp) 608 { 609 struct ct_data *ct = (struct ct_data *) cl->cl_private; 610 611 *errp = ct->ct_error; 612 } 613 614 static bool_t 615 clnt_vc_freeres(CLIENT *cl, xdrproc_t xdr_res, void *res_ptr) 616 { 617 XDR xdrs; 618 bool_t dummy; 619 620 xdrs.x_op = XDR_FREE; 621 dummy = (*xdr_res)(&xdrs, res_ptr); 622 623 return (dummy); 624 } 625 626 /*ARGSUSED*/ 627 static void 628 clnt_vc_abort(CLIENT *cl) 629 { 630 } 631 632 static bool_t 633 clnt_vc_control(CLIENT *cl, u_int request, void *info) 634 { 635 struct ct_data *ct = (struct ct_data *)cl->cl_private; 636 void *infop = info; 637 638 mtx_lock(&ct->ct_lock); 639 640 switch (request) { 641 case CLSET_FD_CLOSE: 642 ct->ct_closeit = TRUE; 643 mtx_unlock(&ct->ct_lock); 644 return (TRUE); 645 case CLSET_FD_NCLOSE: 646 ct->ct_closeit = FALSE; 647 mtx_unlock(&ct->ct_lock); 648 return (TRUE); 649 default: 650 break; 651 } 652 653 /* for other requests which use info */ 654 if (info == NULL) { 655 mtx_unlock(&ct->ct_lock); 656 return (FALSE); 657 } 658 switch (request) { 659 case CLSET_TIMEOUT: 660 if (time_not_ok((struct timeval *)info)) { 661 mtx_unlock(&ct->ct_lock); 662 return (FALSE); 663 } 664 ct->ct_wait = *(struct timeval *)infop; 665 break; 666 case CLGET_TIMEOUT: 667 *(struct timeval *)infop = ct->ct_wait; 668 break; 669 case CLGET_SERVER_ADDR: 670 (void) memcpy(info, &ct->ct_addr, (size_t)ct->ct_addr.ss_len); 671 break; 672 case CLGET_SVC_ADDR: 673 /* 674 * Slightly different semantics to userland - we use 675 * sockaddr instead of netbuf. 676 */ 677 memcpy(info, &ct->ct_addr, ct->ct_addr.ss_len); 678 break; 679 case CLSET_SVC_ADDR: /* set to new address */ 680 mtx_unlock(&ct->ct_lock); 681 return (FALSE); 682 case CLGET_XID: 683 *(uint32_t *)info = ct->ct_xid; 684 break; 685 case CLSET_XID: 686 /* This will set the xid of the NEXT call */ 687 /* decrement by 1 as clnt_vc_call() increments once */ 688 ct->ct_xid = *(uint32_t *)info - 1; 689 break; 690 case CLGET_VERS: 691 /* 692 * This RELIES on the information that, in the call body, 693 * the version number field is the fifth field from the 694 * begining of the RPC header. MUST be changed if the 695 * call_struct is changed 696 */ 697 *(uint32_t *)info = 698 ntohl(*(uint32_t *)(void *)(ct->ct_mcallc + 699 4 * BYTES_PER_XDR_UNIT)); 700 break; 701 702 case CLSET_VERS: 703 *(uint32_t *)(void *)(ct->ct_mcallc + 704 4 * BYTES_PER_XDR_UNIT) = 705 htonl(*(uint32_t *)info); 706 break; 707 708 case CLGET_PROG: 709 /* 710 * This RELIES on the information that, in the call body, 711 * the program number field is the fourth field from the 712 * begining of the RPC header. MUST be changed if the 713 * call_struct is changed 714 */ 715 *(uint32_t *)info = 716 ntohl(*(uint32_t *)(void *)(ct->ct_mcallc + 717 3 * BYTES_PER_XDR_UNIT)); 718 break; 719 720 case CLSET_PROG: 721 *(uint32_t *)(void *)(ct->ct_mcallc + 722 3 * BYTES_PER_XDR_UNIT) = 723 htonl(*(uint32_t *)info); 724 break; 725 726 case CLSET_WAITCHAN: 727 ct->ct_waitchan = (const char *)info; 728 break; 729 730 case CLGET_WAITCHAN: 731 *(const char **) info = ct->ct_waitchan; 732 break; 733 734 case CLSET_INTERRUPTIBLE: 735 if (*(int *) info) 736 ct->ct_waitflag = PCATCH | PBDRY; 737 else 738 ct->ct_waitflag = 0; 739 break; 740 741 case CLGET_INTERRUPTIBLE: 742 if (ct->ct_waitflag) 743 *(int *) info = TRUE; 744 else 745 *(int *) info = FALSE; 746 break; 747 748 default: 749 mtx_unlock(&ct->ct_lock); 750 return (FALSE); 751 } 752 753 mtx_unlock(&ct->ct_lock); 754 return (TRUE); 755 } 756 757 static void 758 clnt_vc_close(CLIENT *cl) 759 { 760 struct ct_data *ct = (struct ct_data *) cl->cl_private; 761 struct ct_request *cr; 762 763 mtx_lock(&ct->ct_lock); 764 765 if (ct->ct_closed) { 766 mtx_unlock(&ct->ct_lock); 767 return; 768 } 769 770 if (ct->ct_closing) { 771 while (ct->ct_closing) 772 msleep(ct, &ct->ct_lock, 0, "rpcclose", 0); 773 KASSERT(ct->ct_closed, ("client should be closed")); 774 mtx_unlock(&ct->ct_lock); 775 return; 776 } 777 778 if (ct->ct_socket) { 779 ct->ct_closing = TRUE; 780 mtx_unlock(&ct->ct_lock); 781 782 SOCKBUF_LOCK(&ct->ct_socket->so_rcv); 783 soupcall_clear(ct->ct_socket, SO_RCV); 784 clnt_vc_upcallsdone(ct); 785 SOCKBUF_UNLOCK(&ct->ct_socket->so_rcv); 786 787 /* 788 * Abort any pending requests and wait until everyone 789 * has finished with clnt_vc_call. 790 */ 791 mtx_lock(&ct->ct_lock); 792 TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) { 793 cr->cr_xid = 0; 794 cr->cr_error = ESHUTDOWN; 795 wakeup(cr); 796 } 797 798 while (ct->ct_threads) 799 msleep(ct, &ct->ct_lock, 0, "rpcclose", 0); 800 } 801 802 ct->ct_closing = FALSE; 803 ct->ct_closed = TRUE; 804 mtx_unlock(&ct->ct_lock); 805 wakeup(ct); 806 } 807 808 static void 809 clnt_vc_destroy(CLIENT *cl) 810 { 811 struct ct_data *ct = (struct ct_data *) cl->cl_private; 812 struct socket *so = NULL; 813 814 clnt_vc_close(cl); 815 816 mtx_lock(&ct->ct_lock); 817 818 if (ct->ct_socket) { 819 if (ct->ct_closeit) { 820 so = ct->ct_socket; 821 } 822 } 823 824 mtx_unlock(&ct->ct_lock); 825 826 mtx_destroy(&ct->ct_lock); 827 if (so) { 828 soshutdown(so, SHUT_WR); 829 soclose(so); 830 } 831 mem_free(ct, sizeof(struct ct_data)); 832 mem_free(cl, sizeof(CLIENT)); 833 } 834 835 /* 836 * Make sure that the time is not garbage. -1 value is disallowed. 837 * Note this is different from time_not_ok in clnt_dg.c 838 */ 839 static bool_t 840 time_not_ok(struct timeval *t) 841 { 842 return (t->tv_sec <= -1 || t->tv_sec > 100000000 || 843 t->tv_usec <= -1 || t->tv_usec > 1000000); 844 } 845 846 int 847 clnt_vc_soupcall(struct socket *so, void *arg, int waitflag) 848 { 849 struct ct_data *ct = (struct ct_data *) arg; 850 struct uio uio; 851 struct mbuf *m; 852 struct ct_request *cr; 853 int error, rcvflag, foundreq; 854 uint32_t xid, header; 855 bool_t do_read; 856 857 ct->ct_upcallrefs++; 858 uio.uio_td = curthread; 859 do { 860 /* 861 * If ct_record_resid is zero, we are waiting for a 862 * record mark. 863 */ 864 if (ct->ct_record_resid == 0) { 865 866 /* 867 * Make sure there is either a whole record 868 * mark in the buffer or there is some other 869 * error condition 870 */ 871 do_read = FALSE; 872 if (so->so_rcv.sb_cc >= sizeof(uint32_t) 873 || (so->so_rcv.sb_state & SBS_CANTRCVMORE) 874 || so->so_error) 875 do_read = TRUE; 876 877 if (!do_read) 878 break; 879 880 SOCKBUF_UNLOCK(&so->so_rcv); 881 uio.uio_resid = sizeof(uint32_t); 882 m = NULL; 883 rcvflag = MSG_DONTWAIT | MSG_SOCALLBCK; 884 error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag); 885 SOCKBUF_LOCK(&so->so_rcv); 886 887 if (error == EWOULDBLOCK) 888 break; 889 890 /* 891 * If there was an error, wake up all pending 892 * requests. 893 */ 894 if (error || uio.uio_resid > 0) { 895 wakeup_all: 896 mtx_lock(&ct->ct_lock); 897 if (!error) { 898 /* 899 * We must have got EOF trying 900 * to read from the stream. 901 */ 902 error = ECONNRESET; 903 } 904 ct->ct_error.re_status = RPC_CANTRECV; 905 ct->ct_error.re_errno = error; 906 TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) { 907 cr->cr_error = error; 908 wakeup(cr); 909 } 910 mtx_unlock(&ct->ct_lock); 911 break; 912 } 913 bcopy(mtod(m, uint32_t *), &header, sizeof(uint32_t)); 914 header = ntohl(header); 915 ct->ct_record = NULL; 916 ct->ct_record_resid = header & 0x7fffffff; 917 ct->ct_record_eor = ((header & 0x80000000) != 0); 918 m_freem(m); 919 } else { 920 /* 921 * Wait until the socket has the whole record 922 * buffered. 923 */ 924 do_read = FALSE; 925 if (so->so_rcv.sb_cc >= ct->ct_record_resid 926 || (so->so_rcv.sb_state & SBS_CANTRCVMORE) 927 || so->so_error) 928 do_read = TRUE; 929 930 if (!do_read) 931 break; 932 933 /* 934 * We have the record mark. Read as much as 935 * the socket has buffered up to the end of 936 * this record. 937 */ 938 SOCKBUF_UNLOCK(&so->so_rcv); 939 uio.uio_resid = ct->ct_record_resid; 940 m = NULL; 941 rcvflag = MSG_DONTWAIT | MSG_SOCALLBCK; 942 error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag); 943 SOCKBUF_LOCK(&so->so_rcv); 944 945 if (error == EWOULDBLOCK) 946 break; 947 948 if (error || uio.uio_resid == ct->ct_record_resid) 949 goto wakeup_all; 950 951 /* 952 * If we have part of the record already, 953 * chain this bit onto the end. 954 */ 955 if (ct->ct_record) 956 m_last(ct->ct_record)->m_next = m; 957 else 958 ct->ct_record = m; 959 960 ct->ct_record_resid = uio.uio_resid; 961 962 /* 963 * If we have the entire record, see if we can 964 * match it to a request. 965 */ 966 if (ct->ct_record_resid == 0 967 && ct->ct_record_eor) { 968 /* 969 * The XID is in the first uint32_t of 970 * the reply. 971 */ 972 if (ct->ct_record->m_len < sizeof(xid)) 973 ct->ct_record = 974 m_pullup(ct->ct_record, 975 sizeof(xid)); 976 if (!ct->ct_record) 977 break; 978 bcopy(mtod(ct->ct_record, uint32_t *), 979 &xid, sizeof(uint32_t)); 980 xid = ntohl(xid); 981 982 mtx_lock(&ct->ct_lock); 983 foundreq = 0; 984 TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) { 985 if (cr->cr_xid == xid) { 986 /* 987 * This one 988 * matches. We leave 989 * the reply mbuf in 990 * cr->cr_mrep. Set 991 * the XID to zero so 992 * that we will ignore 993 * any duplicaed 994 * replies. 995 */ 996 cr->cr_xid = 0; 997 cr->cr_mrep = ct->ct_record; 998 cr->cr_error = 0; 999 foundreq = 1; 1000 wakeup(cr); 1001 break; 1002 } 1003 } 1004 mtx_unlock(&ct->ct_lock); 1005 1006 if (!foundreq) 1007 m_freem(ct->ct_record); 1008 ct->ct_record = NULL; 1009 } 1010 } 1011 } while (m); 1012 ct->ct_upcallrefs--; 1013 if (ct->ct_upcallrefs < 0) 1014 panic("rpcvc upcall refcnt"); 1015 if (ct->ct_upcallrefs == 0) 1016 wakeup(&ct->ct_upcallrefs); 1017 return (SU_OK); 1018 } 1019 1020 /* 1021 * Wait for all upcalls in progress to complete. 1022 */ 1023 static void 1024 clnt_vc_upcallsdone(struct ct_data *ct) 1025 { 1026 1027 SOCKBUF_LOCK_ASSERT(&ct->ct_socket->so_rcv); 1028 1029 while (ct->ct_upcallrefs > 0) 1030 (void) msleep(&ct->ct_upcallrefs, 1031 SOCKBUF_MTX(&ct->ct_socket->so_rcv), 0, "rpcvcup", 0); 1032 }
Cache object: e66d421549ffcb8904b9caced748138c
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