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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("$FreeBSD$"); 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/socket.h> 68 #include <sys/socketvar.h> 69 #include <sys/syslog.h> 70 #include <sys/time.h> 71 #include <sys/uio.h> 72 73 #include <rpc/rpc.h> 74 #include <rpc/rpc_com.h> 75 76 #define MCALL_MSG_SIZE 24 77 78 struct cmessage { 79 struct cmsghdr cmsg; 80 struct cmsgcred cmcred; 81 }; 82 83 static enum clnt_stat clnt_vc_call(CLIENT *, rpcproc_t, xdrproc_t, void *, 84 xdrproc_t, void *, struct timeval); 85 static void clnt_vc_geterr(CLIENT *, struct rpc_err *); 86 static bool_t clnt_vc_freeres(CLIENT *, xdrproc_t, void *); 87 static void clnt_vc_abort(CLIENT *); 88 static bool_t clnt_vc_control(CLIENT *, u_int, void *); 89 static void clnt_vc_destroy(CLIENT *); 90 static bool_t time_not_ok(struct timeval *); 91 static void clnt_vc_soupcall(struct socket *so, void *arg, int waitflag); 92 93 static struct clnt_ops clnt_vc_ops = { 94 .cl_call = clnt_vc_call, 95 .cl_abort = clnt_vc_abort, 96 .cl_geterr = clnt_vc_geterr, 97 .cl_freeres = clnt_vc_freeres, 98 .cl_destroy = clnt_vc_destroy, 99 .cl_control = clnt_vc_control 100 }; 101 102 /* 103 * A pending RPC request which awaits a reply. 104 */ 105 struct ct_request { 106 TAILQ_ENTRY(ct_request) cr_link; 107 uint32_t cr_xid; /* XID of request */ 108 struct mbuf *cr_mrep; /* reply received by upcall */ 109 int cr_error; /* any error from upcall */ 110 }; 111 112 TAILQ_HEAD(ct_request_list, ct_request); 113 114 struct ct_data { 115 struct mtx ct_lock; 116 struct socket *ct_socket; /* connection socket */ 117 bool_t ct_closeit; /* close it on destroy */ 118 struct timeval ct_wait; /* wait interval in milliseconds */ 119 struct sockaddr_storage ct_addr; /* remote addr */ 120 struct rpc_err ct_error; 121 uint32_t ct_xid; 122 char ct_mcallc[MCALL_MSG_SIZE]; /* marshalled callmsg */ 123 size_t ct_mpos; /* pos after marshal */ 124 const char *ct_waitchan; 125 int ct_waitflag; 126 struct mbuf *ct_record; /* current reply record */ 127 size_t ct_record_resid; /* how much left of reply to read */ 128 bool_t ct_record_eor; /* true if reading last fragment */ 129 struct ct_request_list ct_pending; 130 }; 131 132 static const char clnt_vc_errstr[] = "%s : %s"; 133 static const char clnt_vc_str[] = "clnt_vc_create"; 134 static const char clnt_read_vc_str[] = "read_vc"; 135 static const char __no_mem_str[] = "out of memory"; 136 137 /* 138 * Create a client handle for a connection. 139 * Default options are set, which the user can change using clnt_control()'s. 140 * The rpc/vc package does buffering similar to stdio, so the client 141 * must pick send and receive buffer sizes, 0 => use the default. 142 * NB: fd is copied into a private area. 143 * NB: The rpch->cl_auth is set null authentication. Caller may wish to 144 * set this something more useful. 145 * 146 * fd should be an open socket 147 */ 148 CLIENT * 149 clnt_vc_create( 150 struct socket *so, /* open file descriptor */ 151 struct sockaddr *raddr, /* servers address */ 152 const rpcprog_t prog, /* program number */ 153 const rpcvers_t vers, /* version number */ 154 size_t sendsz, /* buffer recv size */ 155 size_t recvsz) /* buffer send size */ 156 { 157 CLIENT *cl; /* client handle */ 158 struct ct_data *ct = NULL; /* client handle */ 159 struct timeval now; 160 struct rpc_msg call_msg; 161 static uint32_t disrupt; 162 struct __rpc_sockinfo si; 163 XDR xdrs; 164 int error; 165 166 if (disrupt == 0) 167 disrupt = (uint32_t)(long)raddr; 168 169 cl = (CLIENT *)mem_alloc(sizeof (*cl)); 170 ct = (struct ct_data *)mem_alloc(sizeof (*ct)); 171 172 mtx_init(&ct->ct_lock, "ct->ct_lock", NULL, MTX_DEF); 173 174 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) { 175 error = soconnect(so, raddr, curthread); 176 if (error) { 177 rpc_createerr.cf_stat = RPC_SYSTEMERROR; 178 rpc_createerr.cf_error.re_errno = error; 179 goto err; 180 } 181 } 182 183 if (!__rpc_socket2sockinfo(so, &si)) 184 goto err; 185 186 ct->ct_closeit = FALSE; 187 188 /* 189 * Set up private data struct 190 */ 191 ct->ct_socket = so; 192 ct->ct_wait.tv_sec = -1; 193 ct->ct_wait.tv_usec = -1; 194 memcpy(&ct->ct_addr, raddr, raddr->sa_len); 195 196 /* 197 * Initialize call message 198 */ 199 getmicrotime(&now); 200 ct->ct_xid = ((uint32_t)++disrupt) ^ __RPC_GETXID(&now); 201 call_msg.rm_xid = ct->ct_xid; 202 call_msg.rm_direction = CALL; 203 call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; 204 call_msg.rm_call.cb_prog = (uint32_t)prog; 205 call_msg.rm_call.cb_vers = (uint32_t)vers; 206 207 /* 208 * pre-serialize the static part of the call msg and stash it away 209 */ 210 xdrmem_create(&xdrs, ct->ct_mcallc, MCALL_MSG_SIZE, 211 XDR_ENCODE); 212 if (! xdr_callhdr(&xdrs, &call_msg)) { 213 if (ct->ct_closeit) { 214 soclose(ct->ct_socket); 215 } 216 goto err; 217 } 218 ct->ct_mpos = XDR_GETPOS(&xdrs); 219 XDR_DESTROY(&xdrs); 220 ct->ct_waitchan = "rpcrecv"; 221 ct->ct_waitflag = 0; 222 223 /* 224 * Create a client handle which uses xdrrec for serialization 225 * and authnone for authentication. 226 */ 227 cl->cl_ops = &clnt_vc_ops; 228 cl->cl_private = ct; 229 cl->cl_auth = authnone_create(); 230 sendsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsz); 231 recvsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsz); 232 233 SOCKBUF_LOCK(&ct->ct_socket->so_rcv); 234 ct->ct_socket->so_upcallarg = ct; 235 ct->ct_socket->so_upcall = clnt_vc_soupcall; 236 ct->ct_socket->so_rcv.sb_flags |= SB_UPCALL; 237 SOCKBUF_UNLOCK(&ct->ct_socket->so_rcv); 238 239 ct->ct_record = NULL; 240 ct->ct_record_resid = 0; 241 TAILQ_INIT(&ct->ct_pending); 242 return (cl); 243 244 err: 245 if (cl) { 246 if (ct) { 247 mem_free(ct, sizeof (struct ct_data)); 248 } 249 if (cl) 250 mem_free(cl, sizeof (CLIENT)); 251 } 252 return ((CLIENT *)NULL); 253 } 254 255 static enum clnt_stat 256 clnt_vc_call( 257 CLIENT *cl, 258 rpcproc_t proc, 259 xdrproc_t xdr_args, 260 void *args_ptr, 261 xdrproc_t xdr_results, 262 void *results_ptr, 263 struct timeval utimeout) 264 { 265 struct ct_data *ct = (struct ct_data *) cl->cl_private; 266 XDR xdrs; 267 struct rpc_msg reply_msg; 268 bool_t ok; 269 int nrefreshes = 2; /* number of times to refresh cred */ 270 struct timeval timeout; 271 uint32_t xid; 272 struct mbuf *mreq = NULL; 273 struct ct_request cr; 274 int error; 275 276 mtx_lock(&ct->ct_lock); 277 278 cr.cr_mrep = NULL; 279 cr.cr_error = 0; 280 281 if (ct->ct_wait.tv_usec == -1) { 282 timeout = utimeout; /* use supplied timeout */ 283 } else { 284 timeout = ct->ct_wait; /* use default timeout */ 285 } 286 287 call_again: 288 mtx_assert(&ct->ct_lock, MA_OWNED); 289 290 ct->ct_xid++; 291 xid = ct->ct_xid; 292 293 mtx_unlock(&ct->ct_lock); 294 295 /* 296 * Leave space to pre-pend the record mark. 297 */ 298 MGETHDR(mreq, M_WAIT, MT_DATA); 299 MCLGET(mreq, M_WAIT); 300 mreq->m_len = 0; 301 mreq->m_data += sizeof(uint32_t); 302 m_append(mreq, ct->ct_mpos, ct->ct_mcallc); 303 304 /* 305 * The XID is the first thing in the request. 306 */ 307 *mtod(mreq, uint32_t *) = htonl(xid); 308 309 xdrmbuf_create(&xdrs, mreq, XDR_ENCODE); 310 311 ct->ct_error.re_status = RPC_SUCCESS; 312 313 if ((! XDR_PUTINT32(&xdrs, &proc)) || 314 (! AUTH_MARSHALL(cl->cl_auth, &xdrs)) || 315 (! (*xdr_args)(&xdrs, args_ptr))) { 316 if (ct->ct_error.re_status == RPC_SUCCESS) 317 ct->ct_error.re_status = RPC_CANTENCODEARGS; 318 m_freem(mreq); 319 return (ct->ct_error.re_status); 320 } 321 m_fixhdr(mreq); 322 323 /* 324 * Prepend a record marker containing the packet length. 325 */ 326 M_PREPEND(mreq, sizeof(uint32_t), M_WAIT); 327 *mtod(mreq, uint32_t *) = 328 htonl(0x80000000 | (mreq->m_pkthdr.len - sizeof(uint32_t))); 329 330 cr.cr_xid = xid; 331 mtx_lock(&ct->ct_lock); 332 TAILQ_INSERT_TAIL(&ct->ct_pending, &cr, cr_link); 333 mtx_unlock(&ct->ct_lock); 334 335 /* 336 * sosend consumes mreq. 337 */ 338 error = sosend(ct->ct_socket, NULL, NULL, mreq, NULL, 0, curthread); 339 mreq = NULL; 340 341 reply_msg.acpted_rply.ar_verf = _null_auth; 342 reply_msg.acpted_rply.ar_results.where = results_ptr; 343 reply_msg.acpted_rply.ar_results.proc = xdr_results; 344 345 mtx_lock(&ct->ct_lock); 346 347 if (error) { 348 TAILQ_REMOVE(&ct->ct_pending, &cr, cr_link); 349 350 ct->ct_error.re_errno = error; 351 ct->ct_error.re_status = RPC_CANTSEND; 352 goto out; 353 } 354 355 /* 356 * Check to see if we got an upcall while waiting for the 357 * lock. In both these cases, the request has been removed 358 * from ct->ct_pending. 359 */ 360 if (cr.cr_error) { 361 ct->ct_error.re_errno = cr.cr_error; 362 ct->ct_error.re_status = RPC_CANTRECV; 363 goto out; 364 } 365 if (cr.cr_mrep) { 366 goto got_reply; 367 } 368 369 /* 370 * Hack to provide rpc-based message passing 371 */ 372 if (timeout.tv_sec == 0 && timeout.tv_usec == 0) { 373 if (cr.cr_xid) 374 TAILQ_REMOVE(&ct->ct_pending, &cr, cr_link); 375 ct->ct_error.re_status = RPC_TIMEDOUT; 376 goto out; 377 } 378 379 error = msleep(&cr, &ct->ct_lock, ct->ct_waitflag, ct->ct_waitchan, 380 tvtohz(&timeout)); 381 382 if (error) { 383 /* 384 * The sleep returned an error so our request is still 385 * on the list. Turn the error code into an 386 * appropriate client status. 387 */ 388 if (cr.cr_xid) 389 TAILQ_REMOVE(&ct->ct_pending, &cr, cr_link); 390 ct->ct_error.re_errno = error; 391 switch (error) { 392 case EINTR: 393 ct->ct_error.re_status = RPC_INTR; 394 break; 395 case EWOULDBLOCK: 396 ct->ct_error.re_status = RPC_TIMEDOUT; 397 break; 398 default: 399 ct->ct_error.re_status = RPC_CANTRECV; 400 } 401 goto out; 402 } else { 403 /* 404 * We were woken up by the upcall. If the 405 * upcall had a receive error, report that, 406 * otherwise we have a reply. 407 */ 408 if (cr.cr_error) { 409 ct->ct_error.re_errno = cr.cr_error; 410 ct->ct_error.re_status = RPC_CANTRECV; 411 goto out; 412 } 413 } 414 415 got_reply: 416 /* 417 * Now decode and validate the response. We need to drop the 418 * lock since xdr_replymsg may end up sleeping in malloc. 419 */ 420 mtx_unlock(&ct->ct_lock); 421 422 xdrmbuf_create(&xdrs, cr.cr_mrep, XDR_DECODE); 423 ok = xdr_replymsg(&xdrs, &reply_msg); 424 XDR_DESTROY(&xdrs); 425 cr.cr_mrep = NULL; 426 427 mtx_lock(&ct->ct_lock); 428 429 if (ok) { 430 if ((reply_msg.rm_reply.rp_stat == MSG_ACCEPTED) && 431 (reply_msg.acpted_rply.ar_stat == SUCCESS)) 432 ct->ct_error.re_status = RPC_SUCCESS; 433 else 434 _seterr_reply(&reply_msg, &(ct->ct_error)); 435 436 if (ct->ct_error.re_status == RPC_SUCCESS) { 437 if (! AUTH_VALIDATE(cl->cl_auth, 438 &reply_msg.acpted_rply.ar_verf)) { 439 ct->ct_error.re_status = RPC_AUTHERROR; 440 ct->ct_error.re_why = AUTH_INVALIDRESP; 441 } 442 if (reply_msg.acpted_rply.ar_verf.oa_base != NULL) { 443 xdrs.x_op = XDR_FREE; 444 (void) xdr_opaque_auth(&xdrs, 445 &(reply_msg.acpted_rply.ar_verf)); 446 } 447 } /* end successful completion */ 448 /* 449 * If unsuccesful AND error is an authentication error 450 * then refresh credentials and try again, else break 451 */ 452 else if (ct->ct_error.re_status == RPC_AUTHERROR) 453 /* maybe our credentials need to be refreshed ... */ 454 if (nrefreshes > 0 && 455 AUTH_REFRESH(cl->cl_auth, &reply_msg)) { 456 nrefreshes--; 457 goto call_again; 458 } 459 /* end of unsuccessful completion */ 460 } /* end of valid reply message */ 461 else { 462 ct->ct_error.re_status = RPC_CANTDECODERES; 463 } 464 out: 465 mtx_assert(&ct->ct_lock, MA_OWNED); 466 467 if (mreq) 468 m_freem(mreq); 469 if (cr.cr_mrep) 470 m_freem(cr.cr_mrep); 471 472 mtx_unlock(&ct->ct_lock); 473 return (ct->ct_error.re_status); 474 } 475 476 static void 477 clnt_vc_geterr(CLIENT *cl, struct rpc_err *errp) 478 { 479 struct ct_data *ct = (struct ct_data *) cl->cl_private; 480 481 *errp = ct->ct_error; 482 } 483 484 static bool_t 485 clnt_vc_freeres(CLIENT *cl, xdrproc_t xdr_res, void *res_ptr) 486 { 487 XDR xdrs; 488 bool_t dummy; 489 490 xdrs.x_op = XDR_FREE; 491 dummy = (*xdr_res)(&xdrs, res_ptr); 492 493 return (dummy); 494 } 495 496 /*ARGSUSED*/ 497 static void 498 clnt_vc_abort(CLIENT *cl) 499 { 500 } 501 502 static bool_t 503 clnt_vc_control(CLIENT *cl, u_int request, void *info) 504 { 505 struct ct_data *ct = (struct ct_data *)cl->cl_private; 506 void *infop = info; 507 508 mtx_lock(&ct->ct_lock); 509 510 switch (request) { 511 case CLSET_FD_CLOSE: 512 ct->ct_closeit = TRUE; 513 mtx_unlock(&ct->ct_lock); 514 return (TRUE); 515 case CLSET_FD_NCLOSE: 516 ct->ct_closeit = FALSE; 517 mtx_unlock(&ct->ct_lock); 518 return (TRUE); 519 default: 520 break; 521 } 522 523 /* for other requests which use info */ 524 if (info == NULL) { 525 mtx_unlock(&ct->ct_lock); 526 return (FALSE); 527 } 528 switch (request) { 529 case CLSET_TIMEOUT: 530 if (time_not_ok((struct timeval *)info)) { 531 mtx_unlock(&ct->ct_lock); 532 return (FALSE); 533 } 534 ct->ct_wait = *(struct timeval *)infop; 535 break; 536 case CLGET_TIMEOUT: 537 *(struct timeval *)infop = ct->ct_wait; 538 break; 539 case CLGET_SERVER_ADDR: 540 (void) memcpy(info, &ct->ct_addr, (size_t)ct->ct_addr.ss_len); 541 break; 542 case CLGET_SVC_ADDR: 543 /* 544 * Slightly different semantics to userland - we use 545 * sockaddr instead of netbuf. 546 */ 547 memcpy(info, &ct->ct_addr, ct->ct_addr.ss_len); 548 break; 549 case CLSET_SVC_ADDR: /* set to new address */ 550 mtx_unlock(&ct->ct_lock); 551 return (FALSE); 552 case CLGET_XID: 553 *(uint32_t *)info = ct->ct_xid; 554 break; 555 case CLSET_XID: 556 /* This will set the xid of the NEXT call */ 557 /* decrement by 1 as clnt_vc_call() increments once */ 558 ct->ct_xid = *(uint32_t *)info - 1; 559 break; 560 case CLGET_VERS: 561 /* 562 * This RELIES on the information that, in the call body, 563 * the version number field is the fifth field from the 564 * begining of the RPC header. MUST be changed if the 565 * call_struct is changed 566 */ 567 *(uint32_t *)info = 568 ntohl(*(uint32_t *)(void *)(ct->ct_mcallc + 569 4 * BYTES_PER_XDR_UNIT)); 570 break; 571 572 case CLSET_VERS: 573 *(uint32_t *)(void *)(ct->ct_mcallc + 574 4 * BYTES_PER_XDR_UNIT) = 575 htonl(*(uint32_t *)info); 576 break; 577 578 case CLGET_PROG: 579 /* 580 * This RELIES on the information that, in the call body, 581 * the program number field is the fourth field from the 582 * begining of the RPC header. MUST be changed if the 583 * call_struct is changed 584 */ 585 *(uint32_t *)info = 586 ntohl(*(uint32_t *)(void *)(ct->ct_mcallc + 587 3 * BYTES_PER_XDR_UNIT)); 588 break; 589 590 case CLSET_PROG: 591 *(uint32_t *)(void *)(ct->ct_mcallc + 592 3 * BYTES_PER_XDR_UNIT) = 593 htonl(*(uint32_t *)info); 594 break; 595 596 case CLSET_WAITCHAN: 597 ct->ct_waitchan = *(const char **)info; 598 break; 599 600 case CLGET_WAITCHAN: 601 *(const char **) info = ct->ct_waitchan; 602 break; 603 604 case CLSET_INTERRUPTIBLE: 605 if (*(int *) info) 606 ct->ct_waitflag = PCATCH; 607 else 608 ct->ct_waitflag = 0; 609 break; 610 611 case CLGET_INTERRUPTIBLE: 612 if (ct->ct_waitflag) 613 *(int *) info = TRUE; 614 else 615 *(int *) info = FALSE; 616 break; 617 618 default: 619 mtx_unlock(&ct->ct_lock); 620 return (FALSE); 621 } 622 623 mtx_unlock(&ct->ct_lock); 624 return (TRUE); 625 } 626 627 static void 628 clnt_vc_destroy(CLIENT *cl) 629 { 630 struct ct_data *ct = (struct ct_data *) cl->cl_private; 631 struct socket *so = NULL; 632 633 mtx_lock(&ct->ct_lock); 634 635 if (ct->ct_socket) { 636 SOCKBUF_LOCK(&ct->ct_socket->so_rcv); 637 ct->ct_socket->so_upcallarg = NULL; 638 ct->ct_socket->so_upcall = NULL; 639 ct->ct_socket->so_rcv.sb_flags &= ~SB_UPCALL; 640 SOCKBUF_UNLOCK(&ct->ct_socket->so_rcv); 641 642 KASSERT(!TAILQ_FIRST(&ct->ct_pending), 643 ("Destroying RPC client with pending RPC requests")); 644 645 if (ct->ct_closeit) { 646 so = ct->ct_socket; 647 } 648 } 649 650 mtx_unlock(&ct->ct_lock); 651 652 mtx_destroy(&ct->ct_lock); 653 if (so) { 654 soshutdown(so, SHUT_WR); 655 soclose(so); 656 } 657 mem_free(ct, sizeof(struct ct_data)); 658 mem_free(cl, sizeof(CLIENT)); 659 } 660 661 /* 662 * Make sure that the time is not garbage. -1 value is disallowed. 663 * Note this is different from time_not_ok in clnt_dg.c 664 */ 665 static bool_t 666 time_not_ok(struct timeval *t) 667 { 668 return (t->tv_sec <= -1 || t->tv_sec > 100000000 || 669 t->tv_usec <= -1 || t->tv_usec > 1000000); 670 } 671 672 void 673 clnt_vc_soupcall(struct socket *so, void *arg, int waitflag) 674 { 675 struct ct_data *ct = (struct ct_data *) arg; 676 struct uio uio; 677 struct mbuf *m; 678 struct ct_request *cr; 679 int error, rcvflag, foundreq; 680 uint32_t xid, header; 681 682 uio.uio_td = curthread; 683 do { 684 /* 685 * If ct_record_resid is zero, we are waiting for a 686 * record mark. 687 */ 688 if (ct->ct_record_resid == 0) { 689 bool_t do_read; 690 691 /* 692 * Make sure there is either a whole record 693 * mark in the buffer or there is some other 694 * error condition 695 */ 696 do_read = FALSE; 697 SOCKBUF_LOCK(&so->so_rcv); 698 if (so->so_rcv.sb_cc >= sizeof(uint32_t) 699 || (so->so_rcv.sb_state & SBS_CANTRCVMORE) 700 || so->so_error) 701 do_read = TRUE; 702 SOCKBUF_UNLOCK(&so->so_rcv); 703 704 if (!do_read) 705 return; 706 707 uio.uio_resid = sizeof(uint32_t); 708 m = NULL; 709 rcvflag = MSG_DONTWAIT | MSG_SOCALLBCK; 710 error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag); 711 712 if (error == EWOULDBLOCK) 713 break; 714 715 /* 716 * If there was an error, wake up all pending 717 * requests. 718 */ 719 if (error || uio.uio_resid > 0) { 720 wakeup_all: 721 mtx_lock(&ct->ct_lock); 722 if (!error) { 723 /* 724 * We must have got EOF trying 725 * to read from the stream. 726 */ 727 error = ECONNRESET; 728 } 729 ct->ct_error.re_status = RPC_CANTRECV; 730 ct->ct_error.re_errno = error; 731 TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) { 732 cr->cr_error = error; 733 wakeup(cr); 734 } 735 TAILQ_INIT(&ct->ct_pending); 736 mtx_unlock(&ct->ct_lock); 737 break; 738 } 739 memcpy(&header, mtod(m, uint32_t *), sizeof(uint32_t)); 740 header = ntohl(header); 741 ct->ct_record = NULL; 742 ct->ct_record_resid = header & 0x7fffffff; 743 ct->ct_record_eor = ((header & 0x80000000) != 0); 744 m_freem(m); 745 } else { 746 /* 747 * We have the record mark. Read as much as 748 * the socket has buffered up to the end of 749 * this record. 750 */ 751 uio.uio_resid = ct->ct_record_resid; 752 m = NULL; 753 rcvflag = MSG_DONTWAIT | MSG_SOCALLBCK; 754 error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag); 755 756 if (error == EWOULDBLOCK) 757 break; 758 759 if (error || uio.uio_resid == ct->ct_record_resid) 760 goto wakeup_all; 761 762 /* 763 * If we have part of the record already, 764 * chain this bit onto the end. 765 */ 766 if (ct->ct_record) 767 m_last(ct->ct_record)->m_next = m; 768 else 769 ct->ct_record = m; 770 771 ct->ct_record_resid = uio.uio_resid; 772 773 /* 774 * If we have the entire record, see if we can 775 * match it to a request. 776 */ 777 if (ct->ct_record_resid == 0 778 && ct->ct_record_eor) { 779 /* 780 * The XID is in the first uint32_t of 781 * the reply. 782 */ 783 ct->ct_record = 784 m_pullup(ct->ct_record, sizeof(xid)); 785 if (!ct->ct_record) 786 break; 787 memcpy(&xid, 788 mtod(ct->ct_record, uint32_t *), 789 sizeof(uint32_t)); 790 xid = ntohl(xid); 791 792 mtx_lock(&ct->ct_lock); 793 foundreq = 0; 794 TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) { 795 if (cr->cr_xid == xid) { 796 /* 797 * This one 798 * matches. We snip it 799 * out of the pending 800 * list and leave the 801 * reply mbuf in 802 * cr->cr_mrep. Set 803 * the XID to zero so 804 * that clnt_vc_call 805 * can know not to 806 * repeat the 807 * TAILQ_REMOVE. 808 */ 809 TAILQ_REMOVE(&ct->ct_pending, 810 cr, cr_link); 811 cr->cr_xid = 0; 812 cr->cr_mrep = ct->ct_record; 813 cr->cr_error = 0; 814 foundreq = 1; 815 wakeup(cr); 816 break; 817 } 818 } 819 mtx_unlock(&ct->ct_lock); 820 821 if (!foundreq) 822 m_freem(ct->ct_record); 823 ct->ct_record = NULL; 824 } 825 } 826 } while (m); 827 }
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