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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/9.0/sys/rpc/clnt_vc.c 221127 2011-04-27 18:19:26Z rmacklem $"); 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 int intrflag) /* interruptible */ 173 { 174 CLIENT *cl; /* client handle */ 175 struct ct_data *ct = NULL; /* client handle */ 176 struct timeval now; 177 struct rpc_msg call_msg; 178 static uint32_t disrupt; 179 struct __rpc_sockinfo si; 180 XDR xdrs; 181 int error, interrupted, one = 1, sleep_flag; 182 struct sockopt sopt; 183 184 if (disrupt == 0) 185 disrupt = (uint32_t)(long)raddr; 186 187 cl = (CLIENT *)mem_alloc(sizeof (*cl)); 188 ct = (struct ct_data *)mem_alloc(sizeof (*ct)); 189 190 mtx_init(&ct->ct_lock, "ct->ct_lock", NULL, MTX_DEF); 191 ct->ct_threads = 0; 192 ct->ct_closing = FALSE; 193 ct->ct_closed = FALSE; 194 ct->ct_upcallrefs = 0; 195 196 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) { 197 error = soconnect(so, raddr, curthread); 198 SOCK_LOCK(so); 199 interrupted = 0; 200 sleep_flag = PSOCK; 201 if (intrflag != 0) 202 sleep_flag |= (PCATCH | PBDRY); 203 while ((so->so_state & SS_ISCONNECTING) 204 && so->so_error == 0) { 205 error = msleep(&so->so_timeo, SOCK_MTX(so), 206 sleep_flag, "connec", 0); 207 if (error) { 208 if (error == EINTR || error == ERESTART) 209 interrupted = 1; 210 break; 211 } 212 } 213 if (error == 0) { 214 error = so->so_error; 215 so->so_error = 0; 216 } 217 SOCK_UNLOCK(so); 218 if (error) { 219 if (!interrupted) 220 so->so_state &= ~SS_ISCONNECTING; 221 rpc_createerr.cf_stat = RPC_SYSTEMERROR; 222 rpc_createerr.cf_error.re_errno = error; 223 goto err; 224 } 225 } 226 227 if (!__rpc_socket2sockinfo(so, &si)) { 228 goto err; 229 } 230 231 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 232 bzero(&sopt, sizeof(sopt)); 233 sopt.sopt_dir = SOPT_SET; 234 sopt.sopt_level = SOL_SOCKET; 235 sopt.sopt_name = SO_KEEPALIVE; 236 sopt.sopt_val = &one; 237 sopt.sopt_valsize = sizeof(one); 238 sosetopt(so, &sopt); 239 } 240 241 if (so->so_proto->pr_protocol == IPPROTO_TCP) { 242 bzero(&sopt, sizeof(sopt)); 243 sopt.sopt_dir = SOPT_SET; 244 sopt.sopt_level = IPPROTO_TCP; 245 sopt.sopt_name = TCP_NODELAY; 246 sopt.sopt_val = &one; 247 sopt.sopt_valsize = sizeof(one); 248 sosetopt(so, &sopt); 249 } 250 251 ct->ct_closeit = FALSE; 252 253 /* 254 * Set up private data struct 255 */ 256 ct->ct_socket = so; 257 ct->ct_wait.tv_sec = -1; 258 ct->ct_wait.tv_usec = -1; 259 memcpy(&ct->ct_addr, raddr, raddr->sa_len); 260 261 /* 262 * Initialize call message 263 */ 264 getmicrotime(&now); 265 ct->ct_xid = ((uint32_t)++disrupt) ^ __RPC_GETXID(&now); 266 call_msg.rm_xid = ct->ct_xid; 267 call_msg.rm_direction = CALL; 268 call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; 269 call_msg.rm_call.cb_prog = (uint32_t)prog; 270 call_msg.rm_call.cb_vers = (uint32_t)vers; 271 272 /* 273 * pre-serialize the static part of the call msg and stash it away 274 */ 275 xdrmem_create(&xdrs, ct->ct_mcallc, MCALL_MSG_SIZE, 276 XDR_ENCODE); 277 if (! xdr_callhdr(&xdrs, &call_msg)) { 278 if (ct->ct_closeit) { 279 soclose(ct->ct_socket); 280 } 281 goto err; 282 } 283 ct->ct_mpos = XDR_GETPOS(&xdrs); 284 XDR_DESTROY(&xdrs); 285 ct->ct_waitchan = "rpcrecv"; 286 ct->ct_waitflag = 0; 287 288 /* 289 * Create a client handle which uses xdrrec for serialization 290 * and authnone for authentication. 291 */ 292 sendsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsz); 293 recvsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsz); 294 error = soreserve(ct->ct_socket, sendsz, recvsz); 295 if (error != 0) { 296 if (ct->ct_closeit) { 297 soclose(ct->ct_socket); 298 } 299 goto err; 300 } 301 cl->cl_refs = 1; 302 cl->cl_ops = &clnt_vc_ops; 303 cl->cl_private = ct; 304 cl->cl_auth = authnone_create(); 305 306 SOCKBUF_LOCK(&ct->ct_socket->so_rcv); 307 soupcall_set(ct->ct_socket, SO_RCV, clnt_vc_soupcall, ct); 308 SOCKBUF_UNLOCK(&ct->ct_socket->so_rcv); 309 310 ct->ct_record = NULL; 311 ct->ct_record_resid = 0; 312 TAILQ_INIT(&ct->ct_pending); 313 return (cl); 314 315 err: 316 if (cl) { 317 if (ct) { 318 mtx_destroy(&ct->ct_lock); 319 mem_free(ct, sizeof (struct ct_data)); 320 } 321 if (cl) 322 mem_free(cl, sizeof (CLIENT)); 323 } 324 return ((CLIENT *)NULL); 325 } 326 327 static enum clnt_stat 328 clnt_vc_call( 329 CLIENT *cl, /* client handle */ 330 struct rpc_callextra *ext, /* call metadata */ 331 rpcproc_t proc, /* procedure number */ 332 struct mbuf *args, /* pointer to args */ 333 struct mbuf **resultsp, /* pointer to results */ 334 struct timeval utimeout) 335 { 336 struct ct_data *ct = (struct ct_data *) cl->cl_private; 337 AUTH *auth; 338 struct rpc_err *errp; 339 enum clnt_stat stat; 340 XDR xdrs; 341 struct rpc_msg reply_msg; 342 bool_t ok; 343 int nrefreshes = 2; /* number of times to refresh cred */ 344 struct timeval timeout; 345 uint32_t xid; 346 struct mbuf *mreq = NULL, *results; 347 struct ct_request *cr; 348 int error; 349 350 cr = malloc(sizeof(struct ct_request), M_RPC, M_WAITOK); 351 352 mtx_lock(&ct->ct_lock); 353 354 if (ct->ct_closing || ct->ct_closed) { 355 mtx_unlock(&ct->ct_lock); 356 free(cr, M_RPC); 357 return (RPC_CANTSEND); 358 } 359 ct->ct_threads++; 360 361 if (ext) { 362 auth = ext->rc_auth; 363 errp = &ext->rc_err; 364 } else { 365 auth = cl->cl_auth; 366 errp = &ct->ct_error; 367 } 368 369 cr->cr_mrep = NULL; 370 cr->cr_error = 0; 371 372 if (ct->ct_wait.tv_usec == -1) { 373 timeout = utimeout; /* use supplied timeout */ 374 } else { 375 timeout = ct->ct_wait; /* use default timeout */ 376 } 377 378 call_again: 379 mtx_assert(&ct->ct_lock, MA_OWNED); 380 381 ct->ct_xid++; 382 xid = ct->ct_xid; 383 384 mtx_unlock(&ct->ct_lock); 385 386 /* 387 * Leave space to pre-pend the record mark. 388 */ 389 MGETHDR(mreq, M_WAIT, MT_DATA); 390 mreq->m_data += sizeof(uint32_t); 391 KASSERT(ct->ct_mpos + sizeof(uint32_t) <= MHLEN, 392 ("RPC header too big")); 393 bcopy(ct->ct_mcallc, mreq->m_data, ct->ct_mpos); 394 mreq->m_len = ct->ct_mpos; 395 396 /* 397 * The XID is the first thing in the request. 398 */ 399 *mtod(mreq, uint32_t *) = htonl(xid); 400 401 xdrmbuf_create(&xdrs, mreq, XDR_ENCODE); 402 403 errp->re_status = stat = RPC_SUCCESS; 404 405 if ((! XDR_PUTINT32(&xdrs, &proc)) || 406 (! AUTH_MARSHALL(auth, xid, &xdrs, 407 m_copym(args, 0, M_COPYALL, M_WAITOK)))) { 408 errp->re_status = stat = RPC_CANTENCODEARGS; 409 mtx_lock(&ct->ct_lock); 410 goto out; 411 } 412 mreq->m_pkthdr.len = m_length(mreq, NULL); 413 414 /* 415 * Prepend a record marker containing the packet length. 416 */ 417 M_PREPEND(mreq, sizeof(uint32_t), M_WAIT); 418 *mtod(mreq, uint32_t *) = 419 htonl(0x80000000 | (mreq->m_pkthdr.len - sizeof(uint32_t))); 420 421 cr->cr_xid = xid; 422 mtx_lock(&ct->ct_lock); 423 /* 424 * Check to see if the other end has already started to close down 425 * the connection. The upcall will have set ct_error.re_status 426 * to RPC_CANTRECV if this is the case. 427 * If the other end starts to close down the connection after this 428 * point, it will be detected later when cr_error is checked, 429 * since the request is in the ct_pending queue. 430 */ 431 if (ct->ct_error.re_status == RPC_CANTRECV) { 432 if (errp != &ct->ct_error) { 433 errp->re_errno = ct->ct_error.re_errno; 434 errp->re_status = RPC_CANTRECV; 435 } 436 stat = RPC_CANTRECV; 437 goto out; 438 } 439 TAILQ_INSERT_TAIL(&ct->ct_pending, cr, cr_link); 440 mtx_unlock(&ct->ct_lock); 441 442 /* 443 * sosend consumes mreq. 444 */ 445 error = sosend(ct->ct_socket, NULL, NULL, mreq, NULL, 0, curthread); 446 mreq = NULL; 447 if (error == EMSGSIZE) { 448 SOCKBUF_LOCK(&ct->ct_socket->so_snd); 449 sbwait(&ct->ct_socket->so_snd); 450 SOCKBUF_UNLOCK(&ct->ct_socket->so_snd); 451 AUTH_VALIDATE(auth, xid, NULL, NULL); 452 mtx_lock(&ct->ct_lock); 453 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link); 454 goto call_again; 455 } 456 457 reply_msg.acpted_rply.ar_verf.oa_flavor = AUTH_NULL; 458 reply_msg.acpted_rply.ar_verf.oa_base = cr->cr_verf; 459 reply_msg.acpted_rply.ar_verf.oa_length = 0; 460 reply_msg.acpted_rply.ar_results.where = NULL; 461 reply_msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void; 462 463 mtx_lock(&ct->ct_lock); 464 if (error) { 465 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link); 466 errp->re_errno = error; 467 errp->re_status = stat = RPC_CANTSEND; 468 goto out; 469 } 470 471 /* 472 * Check to see if we got an upcall while waiting for the 473 * lock. In both these cases, the request has been removed 474 * from ct->ct_pending. 475 */ 476 if (cr->cr_error) { 477 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link); 478 errp->re_errno = cr->cr_error; 479 errp->re_status = stat = RPC_CANTRECV; 480 goto out; 481 } 482 if (cr->cr_mrep) { 483 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link); 484 goto got_reply; 485 } 486 487 /* 488 * Hack to provide rpc-based message passing 489 */ 490 if (timeout.tv_sec == 0 && timeout.tv_usec == 0) { 491 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link); 492 errp->re_status = stat = RPC_TIMEDOUT; 493 goto out; 494 } 495 496 error = msleep(cr, &ct->ct_lock, ct->ct_waitflag, ct->ct_waitchan, 497 tvtohz(&timeout)); 498 499 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link); 500 501 if (error) { 502 /* 503 * The sleep returned an error so our request is still 504 * on the list. Turn the error code into an 505 * appropriate client status. 506 */ 507 errp->re_errno = error; 508 switch (error) { 509 case EINTR: 510 case ERESTART: 511 stat = RPC_INTR; 512 break; 513 case EWOULDBLOCK: 514 stat = RPC_TIMEDOUT; 515 break; 516 default: 517 stat = RPC_CANTRECV; 518 } 519 errp->re_status = stat; 520 goto out; 521 } else { 522 /* 523 * We were woken up by the upcall. If the 524 * upcall had a receive error, report that, 525 * otherwise we have a reply. 526 */ 527 if (cr->cr_error) { 528 errp->re_errno = cr->cr_error; 529 errp->re_status = stat = RPC_CANTRECV; 530 goto out; 531 } 532 } 533 534 got_reply: 535 /* 536 * Now decode and validate the response. We need to drop the 537 * lock since xdr_replymsg may end up sleeping in malloc. 538 */ 539 mtx_unlock(&ct->ct_lock); 540 541 if (ext && ext->rc_feedback) 542 ext->rc_feedback(FEEDBACK_OK, proc, ext->rc_feedback_arg); 543 544 xdrmbuf_create(&xdrs, cr->cr_mrep, XDR_DECODE); 545 ok = xdr_replymsg(&xdrs, &reply_msg); 546 cr->cr_mrep = NULL; 547 548 if (ok) { 549 if ((reply_msg.rm_reply.rp_stat == MSG_ACCEPTED) && 550 (reply_msg.acpted_rply.ar_stat == SUCCESS)) 551 errp->re_status = stat = RPC_SUCCESS; 552 else 553 stat = _seterr_reply(&reply_msg, errp); 554 555 if (stat == RPC_SUCCESS) { 556 results = xdrmbuf_getall(&xdrs); 557 if (!AUTH_VALIDATE(auth, xid, 558 &reply_msg.acpted_rply.ar_verf, 559 &results)) { 560 errp->re_status = stat = RPC_AUTHERROR; 561 errp->re_why = AUTH_INVALIDRESP; 562 } else { 563 KASSERT(results, 564 ("auth validated but no result")); 565 *resultsp = results; 566 } 567 } /* end successful completion */ 568 /* 569 * If unsuccesful AND error is an authentication error 570 * then refresh credentials and try again, else break 571 */ 572 else if (stat == RPC_AUTHERROR) 573 /* maybe our credentials need to be refreshed ... */ 574 if (nrefreshes > 0 && 575 AUTH_REFRESH(auth, &reply_msg)) { 576 nrefreshes--; 577 XDR_DESTROY(&xdrs); 578 mtx_lock(&ct->ct_lock); 579 goto call_again; 580 } 581 /* end of unsuccessful completion */ 582 } /* end of valid reply message */ 583 else { 584 errp->re_status = stat = RPC_CANTDECODERES; 585 } 586 XDR_DESTROY(&xdrs); 587 mtx_lock(&ct->ct_lock); 588 out: 589 mtx_assert(&ct->ct_lock, MA_OWNED); 590 591 KASSERT(stat != RPC_SUCCESS || *resultsp, 592 ("RPC_SUCCESS without reply")); 593 594 if (mreq) 595 m_freem(mreq); 596 if (cr->cr_mrep) 597 m_freem(cr->cr_mrep); 598 599 ct->ct_threads--; 600 if (ct->ct_closing) 601 wakeup(ct); 602 603 mtx_unlock(&ct->ct_lock); 604 605 if (auth && stat != RPC_SUCCESS) 606 AUTH_VALIDATE(auth, xid, NULL, NULL); 607 608 free(cr, M_RPC); 609 610 return (stat); 611 } 612 613 static void 614 clnt_vc_geterr(CLIENT *cl, struct rpc_err *errp) 615 { 616 struct ct_data *ct = (struct ct_data *) cl->cl_private; 617 618 *errp = ct->ct_error; 619 } 620 621 static bool_t 622 clnt_vc_freeres(CLIENT *cl, xdrproc_t xdr_res, void *res_ptr) 623 { 624 XDR xdrs; 625 bool_t dummy; 626 627 xdrs.x_op = XDR_FREE; 628 dummy = (*xdr_res)(&xdrs, res_ptr); 629 630 return (dummy); 631 } 632 633 /*ARGSUSED*/ 634 static void 635 clnt_vc_abort(CLIENT *cl) 636 { 637 } 638 639 static bool_t 640 clnt_vc_control(CLIENT *cl, u_int request, void *info) 641 { 642 struct ct_data *ct = (struct ct_data *)cl->cl_private; 643 void *infop = info; 644 645 mtx_lock(&ct->ct_lock); 646 647 switch (request) { 648 case CLSET_FD_CLOSE: 649 ct->ct_closeit = TRUE; 650 mtx_unlock(&ct->ct_lock); 651 return (TRUE); 652 case CLSET_FD_NCLOSE: 653 ct->ct_closeit = FALSE; 654 mtx_unlock(&ct->ct_lock); 655 return (TRUE); 656 default: 657 break; 658 } 659 660 /* for other requests which use info */ 661 if (info == NULL) { 662 mtx_unlock(&ct->ct_lock); 663 return (FALSE); 664 } 665 switch (request) { 666 case CLSET_TIMEOUT: 667 if (time_not_ok((struct timeval *)info)) { 668 mtx_unlock(&ct->ct_lock); 669 return (FALSE); 670 } 671 ct->ct_wait = *(struct timeval *)infop; 672 break; 673 case CLGET_TIMEOUT: 674 *(struct timeval *)infop = ct->ct_wait; 675 break; 676 case CLGET_SERVER_ADDR: 677 (void) memcpy(info, &ct->ct_addr, (size_t)ct->ct_addr.ss_len); 678 break; 679 case CLGET_SVC_ADDR: 680 /* 681 * Slightly different semantics to userland - we use 682 * sockaddr instead of netbuf. 683 */ 684 memcpy(info, &ct->ct_addr, ct->ct_addr.ss_len); 685 break; 686 case CLSET_SVC_ADDR: /* set to new address */ 687 mtx_unlock(&ct->ct_lock); 688 return (FALSE); 689 case CLGET_XID: 690 *(uint32_t *)info = ct->ct_xid; 691 break; 692 case CLSET_XID: 693 /* This will set the xid of the NEXT call */ 694 /* decrement by 1 as clnt_vc_call() increments once */ 695 ct->ct_xid = *(uint32_t *)info - 1; 696 break; 697 case CLGET_VERS: 698 /* 699 * This RELIES on the information that, in the call body, 700 * the version number field is the fifth field from the 701 * begining of the RPC header. MUST be changed if the 702 * call_struct is changed 703 */ 704 *(uint32_t *)info = 705 ntohl(*(uint32_t *)(void *)(ct->ct_mcallc + 706 4 * BYTES_PER_XDR_UNIT)); 707 break; 708 709 case CLSET_VERS: 710 *(uint32_t *)(void *)(ct->ct_mcallc + 711 4 * BYTES_PER_XDR_UNIT) = 712 htonl(*(uint32_t *)info); 713 break; 714 715 case CLGET_PROG: 716 /* 717 * This RELIES on the information that, in the call body, 718 * the program number field is the fourth field from the 719 * begining of the RPC header. MUST be changed if the 720 * call_struct is changed 721 */ 722 *(uint32_t *)info = 723 ntohl(*(uint32_t *)(void *)(ct->ct_mcallc + 724 3 * BYTES_PER_XDR_UNIT)); 725 break; 726 727 case CLSET_PROG: 728 *(uint32_t *)(void *)(ct->ct_mcallc + 729 3 * BYTES_PER_XDR_UNIT) = 730 htonl(*(uint32_t *)info); 731 break; 732 733 case CLSET_WAITCHAN: 734 ct->ct_waitchan = (const char *)info; 735 break; 736 737 case CLGET_WAITCHAN: 738 *(const char **) info = ct->ct_waitchan; 739 break; 740 741 case CLSET_INTERRUPTIBLE: 742 if (*(int *) info) 743 ct->ct_waitflag = PCATCH | PBDRY; 744 else 745 ct->ct_waitflag = 0; 746 break; 747 748 case CLGET_INTERRUPTIBLE: 749 if (ct->ct_waitflag) 750 *(int *) info = TRUE; 751 else 752 *(int *) info = FALSE; 753 break; 754 755 default: 756 mtx_unlock(&ct->ct_lock); 757 return (FALSE); 758 } 759 760 mtx_unlock(&ct->ct_lock); 761 return (TRUE); 762 } 763 764 static void 765 clnt_vc_close(CLIENT *cl) 766 { 767 struct ct_data *ct = (struct ct_data *) cl->cl_private; 768 struct ct_request *cr; 769 770 mtx_lock(&ct->ct_lock); 771 772 if (ct->ct_closed) { 773 mtx_unlock(&ct->ct_lock); 774 return; 775 } 776 777 if (ct->ct_closing) { 778 while (ct->ct_closing) 779 msleep(ct, &ct->ct_lock, 0, "rpcclose", 0); 780 KASSERT(ct->ct_closed, ("client should be closed")); 781 mtx_unlock(&ct->ct_lock); 782 return; 783 } 784 785 if (ct->ct_socket) { 786 ct->ct_closing = TRUE; 787 mtx_unlock(&ct->ct_lock); 788 789 SOCKBUF_LOCK(&ct->ct_socket->so_rcv); 790 soupcall_clear(ct->ct_socket, SO_RCV); 791 clnt_vc_upcallsdone(ct); 792 SOCKBUF_UNLOCK(&ct->ct_socket->so_rcv); 793 794 /* 795 * Abort any pending requests and wait until everyone 796 * has finished with clnt_vc_call. 797 */ 798 mtx_lock(&ct->ct_lock); 799 TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) { 800 cr->cr_xid = 0; 801 cr->cr_error = ESHUTDOWN; 802 wakeup(cr); 803 } 804 805 while (ct->ct_threads) 806 msleep(ct, &ct->ct_lock, 0, "rpcclose", 0); 807 } 808 809 ct->ct_closing = FALSE; 810 ct->ct_closed = TRUE; 811 mtx_unlock(&ct->ct_lock); 812 wakeup(ct); 813 } 814 815 static void 816 clnt_vc_destroy(CLIENT *cl) 817 { 818 struct ct_data *ct = (struct ct_data *) cl->cl_private; 819 struct socket *so = NULL; 820 821 clnt_vc_close(cl); 822 823 mtx_lock(&ct->ct_lock); 824 825 if (ct->ct_socket) { 826 if (ct->ct_closeit) { 827 so = ct->ct_socket; 828 } 829 } 830 831 mtx_unlock(&ct->ct_lock); 832 833 mtx_destroy(&ct->ct_lock); 834 if (so) { 835 soshutdown(so, SHUT_WR); 836 soclose(so); 837 } 838 mem_free(ct, sizeof(struct ct_data)); 839 mem_free(cl, sizeof(CLIENT)); 840 } 841 842 /* 843 * Make sure that the time is not garbage. -1 value is disallowed. 844 * Note this is different from time_not_ok in clnt_dg.c 845 */ 846 static bool_t 847 time_not_ok(struct timeval *t) 848 { 849 return (t->tv_sec <= -1 || t->tv_sec > 100000000 || 850 t->tv_usec <= -1 || t->tv_usec > 1000000); 851 } 852 853 int 854 clnt_vc_soupcall(struct socket *so, void *arg, int waitflag) 855 { 856 struct ct_data *ct = (struct ct_data *) arg; 857 struct uio uio; 858 struct mbuf *m; 859 struct ct_request *cr; 860 int error, rcvflag, foundreq; 861 uint32_t xid, header; 862 bool_t do_read; 863 864 ct->ct_upcallrefs++; 865 uio.uio_td = curthread; 866 do { 867 /* 868 * If ct_record_resid is zero, we are waiting for a 869 * record mark. 870 */ 871 if (ct->ct_record_resid == 0) { 872 873 /* 874 * Make sure there is either a whole record 875 * mark in the buffer or there is some other 876 * error condition 877 */ 878 do_read = FALSE; 879 if (so->so_rcv.sb_cc >= sizeof(uint32_t) 880 || (so->so_rcv.sb_state & SBS_CANTRCVMORE) 881 || so->so_error) 882 do_read = TRUE; 883 884 if (!do_read) 885 break; 886 887 SOCKBUF_UNLOCK(&so->so_rcv); 888 uio.uio_resid = sizeof(uint32_t); 889 m = NULL; 890 rcvflag = MSG_DONTWAIT | MSG_SOCALLBCK; 891 error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag); 892 SOCKBUF_LOCK(&so->so_rcv); 893 894 if (error == EWOULDBLOCK) 895 break; 896 897 /* 898 * If there was an error, wake up all pending 899 * requests. 900 */ 901 if (error || uio.uio_resid > 0) { 902 wakeup_all: 903 mtx_lock(&ct->ct_lock); 904 if (!error) { 905 /* 906 * We must have got EOF trying 907 * to read from the stream. 908 */ 909 error = ECONNRESET; 910 } 911 ct->ct_error.re_status = RPC_CANTRECV; 912 ct->ct_error.re_errno = error; 913 TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) { 914 cr->cr_error = error; 915 wakeup(cr); 916 } 917 mtx_unlock(&ct->ct_lock); 918 break; 919 } 920 m_copydata(m, 0, sizeof(uint32_t), (char *)&header); 921 header = ntohl(header); 922 ct->ct_record = NULL; 923 ct->ct_record_resid = header & 0x7fffffff; 924 ct->ct_record_eor = ((header & 0x80000000) != 0); 925 m_freem(m); 926 } else { 927 /* 928 * Wait until the socket has the whole record 929 * buffered. 930 */ 931 do_read = FALSE; 932 if (so->so_rcv.sb_cc >= ct->ct_record_resid 933 || (so->so_rcv.sb_state & SBS_CANTRCVMORE) 934 || so->so_error) 935 do_read = TRUE; 936 937 if (!do_read) 938 break; 939 940 /* 941 * We have the record mark. Read as much as 942 * the socket has buffered up to the end of 943 * this record. 944 */ 945 SOCKBUF_UNLOCK(&so->so_rcv); 946 uio.uio_resid = ct->ct_record_resid; 947 m = NULL; 948 rcvflag = MSG_DONTWAIT | MSG_SOCALLBCK; 949 error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag); 950 SOCKBUF_LOCK(&so->so_rcv); 951 952 if (error == EWOULDBLOCK) 953 break; 954 955 if (error || uio.uio_resid == ct->ct_record_resid) 956 goto wakeup_all; 957 958 /* 959 * If we have part of the record already, 960 * chain this bit onto the end. 961 */ 962 if (ct->ct_record) 963 m_last(ct->ct_record)->m_next = m; 964 else 965 ct->ct_record = m; 966 967 ct->ct_record_resid = uio.uio_resid; 968 969 /* 970 * If we have the entire record, see if we can 971 * match it to a request. 972 */ 973 if (ct->ct_record_resid == 0 974 && ct->ct_record_eor) { 975 /* 976 * The XID is in the first uint32_t of 977 * the reply. 978 */ 979 if (ct->ct_record->m_len < sizeof(xid) && 980 m_length(ct->ct_record, NULL) < 981 sizeof(xid)) { 982 m_freem(ct->ct_record); 983 break; 984 } 985 m_copydata(ct->ct_record, 0, sizeof(xid), 986 (char *)&xid); 987 xid = ntohl(xid); 988 989 mtx_lock(&ct->ct_lock); 990 foundreq = 0; 991 TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) { 992 if (cr->cr_xid == xid) { 993 /* 994 * This one 995 * matches. We leave 996 * the reply mbuf in 997 * cr->cr_mrep. Set 998 * the XID to zero so 999 * that we will ignore 1000 * any duplicaed 1001 * replies. 1002 */ 1003 cr->cr_xid = 0; 1004 cr->cr_mrep = ct->ct_record; 1005 cr->cr_error = 0; 1006 foundreq = 1; 1007 wakeup(cr); 1008 break; 1009 } 1010 } 1011 mtx_unlock(&ct->ct_lock); 1012 1013 if (!foundreq) 1014 m_freem(ct->ct_record); 1015 ct->ct_record = NULL; 1016 } 1017 } 1018 } while (m); 1019 ct->ct_upcallrefs--; 1020 if (ct->ct_upcallrefs < 0) 1021 panic("rpcvc upcall refcnt"); 1022 if (ct->ct_upcallrefs == 0) 1023 wakeup(&ct->ct_upcallrefs); 1024 return (SU_OK); 1025 } 1026 1027 /* 1028 * Wait for all upcalls in progress to complete. 1029 */ 1030 static void 1031 clnt_vc_upcallsdone(struct ct_data *ct) 1032 { 1033 1034 SOCKBUF_LOCK_ASSERT(&ct->ct_socket->so_rcv); 1035 1036 while (ct->ct_upcallrefs > 0) 1037 (void) msleep(&ct->ct_upcallrefs, 1038 SOCKBUF_MTX(&ct->ct_socket->so_rcv), 0, "rpcvcup", 0); 1039 }
Cache object: b4766ef28304c3a749c8ae731600e6ea
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