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sys/rpc/clnt_dg.c
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1 /* $NetBSD: clnt_dg.c,v 1.4 2000/07/14 08:40:41 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 * Copyright (c) 1986-1991 by Sun Microsystems Inc. 33 */ 34 35 #if defined(LIBC_SCCS) && !defined(lint) 36 #ident "@(#)clnt_dg.c 1.23 94/04/22 SMI" 37 static char sccsid[] = "@(#)clnt_dg.c 1.19 89/03/16 Copyr 1988 Sun Micro"; 38 #endif 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD$"); 41 42 /* 43 * Implements a connectionless client side RPC. 44 */ 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/lock.h> 49 #include <sys/malloc.h> 50 #include <sys/mbuf.h> 51 #include <sys/mutex.h> 52 #include <sys/pcpu.h> 53 #include <sys/proc.h> 54 #include <sys/socket.h> 55 #include <sys/socketvar.h> 56 #include <sys/time.h> 57 #include <sys/uio.h> 58 59 #include <rpc/rpc.h> 60 #include <rpc/rpc_com.h> 61 62 63 #ifdef _FREEFALL_CONFIG 64 /* 65 * Disable RPC exponential back-off for FreeBSD.org systems. 66 */ 67 #define RPC_MAX_BACKOFF 1 /* second */ 68 #else 69 #define RPC_MAX_BACKOFF 30 /* seconds */ 70 #endif 71 72 static bool_t time_not_ok(struct timeval *); 73 static enum clnt_stat clnt_dg_call(CLIENT *, rpcproc_t, xdrproc_t, void *, 74 xdrproc_t, void *, struct timeval); 75 static void clnt_dg_geterr(CLIENT *, struct rpc_err *); 76 static bool_t clnt_dg_freeres(CLIENT *, xdrproc_t, void *); 77 static void clnt_dg_abort(CLIENT *); 78 static bool_t clnt_dg_control(CLIENT *, u_int, void *); 79 static void clnt_dg_destroy(CLIENT *); 80 static void clnt_dg_soupcall(struct socket *so, void *arg, int waitflag); 81 82 static struct clnt_ops clnt_dg_ops = { 83 .cl_call = clnt_dg_call, 84 .cl_abort = clnt_dg_abort, 85 .cl_geterr = clnt_dg_geterr, 86 .cl_freeres = clnt_dg_freeres, 87 .cl_destroy = clnt_dg_destroy, 88 .cl_control = clnt_dg_control 89 }; 90 91 static const char mem_err_clnt_dg[] = "clnt_dg_create: out of memory"; 92 93 /* 94 * A pending RPC request which awaits a reply. 95 */ 96 struct cu_request { 97 TAILQ_ENTRY(cu_request) cr_link; 98 uint32_t cr_xid; /* XID of request */ 99 struct mbuf *cr_mrep; /* reply received by upcall */ 100 int cr_error; /* any error from upcall */ 101 }; 102 103 TAILQ_HEAD(cu_request_list, cu_request); 104 105 #define MCALL_MSG_SIZE 24 106 107 /* 108 * This structure is pointed to by the socket's so_upcallarg 109 * member. It is separate from the client private data to facilitate 110 * multiple clients sharing the same socket. The cs_lock mutex is used 111 * to protect all fields of this structure, the socket's receive 112 * buffer SOCKBUF_LOCK is used to ensure that exactly one of these 113 * structures is installed on the socket. 114 */ 115 struct cu_socket { 116 struct mtx cs_lock; 117 int cs_refs; /* Count of clients */ 118 struct cu_request_list cs_pending; /* Requests awaiting replies */ 119 120 }; 121 122 /* 123 * Private data kept per client handle 124 */ 125 struct cu_data { 126 struct socket *cu_socket; /* connection socket */ 127 bool_t cu_closeit; /* opened by library */ 128 struct sockaddr_storage cu_raddr; /* remote address */ 129 int cu_rlen; 130 struct timeval cu_wait; /* retransmit interval */ 131 struct timeval cu_total; /* total time for the call */ 132 struct rpc_err cu_error; 133 uint32_t cu_xid; 134 char cu_mcallc[MCALL_MSG_SIZE]; /* marshalled callmsg */ 135 size_t cu_mcalllen; 136 size_t cu_sendsz; /* send size */ 137 size_t cu_recvsz; /* recv size */ 138 int cu_async; 139 int cu_connect; /* Use connect(). */ 140 int cu_connected; /* Have done connect(). */ 141 const char *cu_waitchan; 142 int cu_waitflag; 143 }; 144 145 /* 146 * Connection less client creation returns with client handle parameters. 147 * Default options are set, which the user can change using clnt_control(). 148 * fd should be open and bound. 149 * NB: The rpch->cl_auth is initialized to null authentication. 150 * Caller may wish to set this something more useful. 151 * 152 * sendsz and recvsz are the maximum allowable packet sizes that can be 153 * sent and received. Normally they are the same, but they can be 154 * changed to improve the program efficiency and buffer allocation. 155 * If they are 0, use the transport default. 156 * 157 * If svcaddr is NULL, returns NULL. 158 */ 159 CLIENT * 160 clnt_dg_create( 161 struct socket *so, 162 struct sockaddr *svcaddr, /* servers address */ 163 rpcprog_t program, /* program number */ 164 rpcvers_t version, /* version number */ 165 size_t sendsz, /* buffer recv size */ 166 size_t recvsz) /* buffer send size */ 167 { 168 CLIENT *cl = NULL; /* client handle */ 169 struct cu_data *cu = NULL; /* private data */ 170 struct cu_socket *cs = NULL; 171 struct timeval now; 172 struct rpc_msg call_msg; 173 struct __rpc_sockinfo si; 174 XDR xdrs; 175 176 if (svcaddr == NULL) { 177 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 178 return (NULL); 179 } 180 181 if (!__rpc_socket2sockinfo(so, &si)) { 182 rpc_createerr.cf_stat = RPC_TLIERROR; 183 rpc_createerr.cf_error.re_errno = 0; 184 return (NULL); 185 } 186 187 /* 188 * Find the receive and the send size 189 */ 190 sendsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsz); 191 recvsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsz); 192 if ((sendsz == 0) || (recvsz == 0)) { 193 rpc_createerr.cf_stat = RPC_TLIERROR; /* XXX */ 194 rpc_createerr.cf_error.re_errno = 0; 195 return (NULL); 196 } 197 198 cl = mem_alloc(sizeof (CLIENT)); 199 200 /* 201 * Should be multiple of 4 for XDR. 202 */ 203 sendsz = ((sendsz + 3) / 4) * 4; 204 recvsz = ((recvsz + 3) / 4) * 4; 205 cu = mem_alloc(sizeof (*cu)); 206 (void) memcpy(&cu->cu_raddr, svcaddr, (size_t)svcaddr->sa_len); 207 cu->cu_rlen = svcaddr->sa_len; 208 /* Other values can also be set through clnt_control() */ 209 cu->cu_wait.tv_sec = 15; /* heuristically chosen */ 210 cu->cu_wait.tv_usec = 0; 211 cu->cu_total.tv_sec = -1; 212 cu->cu_total.tv_usec = -1; 213 cu->cu_sendsz = sendsz; 214 cu->cu_recvsz = recvsz; 215 cu->cu_async = FALSE; 216 cu->cu_connect = FALSE; 217 cu->cu_connected = FALSE; 218 cu->cu_waitchan = "rpcrecv"; 219 cu->cu_waitflag = 0; 220 (void) getmicrotime(&now); 221 cu->cu_xid = __RPC_GETXID(&now); 222 call_msg.rm_xid = cu->cu_xid; 223 call_msg.rm_call.cb_prog = program; 224 call_msg.rm_call.cb_vers = version; 225 xdrmem_create(&xdrs, cu->cu_mcallc, MCALL_MSG_SIZE, XDR_ENCODE); 226 if (! xdr_callhdr(&xdrs, &call_msg)) { 227 rpc_createerr.cf_stat = RPC_CANTENCODEARGS; /* XXX */ 228 rpc_createerr.cf_error.re_errno = 0; 229 goto err2; 230 } 231 cu->cu_mcalllen = XDR_GETPOS(&xdrs);; 232 233 /* 234 * By default, closeit is always FALSE. It is users responsibility 235 * to do a close on it, else the user may use clnt_control 236 * to let clnt_destroy do it for him/her. 237 */ 238 cu->cu_closeit = FALSE; 239 cu->cu_socket = so; 240 241 SOCKBUF_LOCK(&so->so_rcv); 242 recheck_socket: 243 if (so->so_upcall) { 244 if (so->so_upcall != clnt_dg_soupcall) { 245 SOCKBUF_UNLOCK(&so->so_rcv); 246 printf("clnt_dg_create(): socket already has an incompatible upcall\n"); 247 goto err2; 248 } 249 cs = (struct cu_socket *) so->so_upcallarg; 250 mtx_lock(&cs->cs_lock); 251 cs->cs_refs++; 252 mtx_unlock(&cs->cs_lock); 253 } else { 254 /* 255 * We are the first on this socket - allocate the 256 * structure and install it in the socket. 257 */ 258 SOCKBUF_UNLOCK(&cu->cu_socket->so_rcv); 259 cs = mem_alloc(sizeof(*cs)); 260 SOCKBUF_LOCK(&cu->cu_socket->so_rcv); 261 if (so->so_upcall) { 262 /* 263 * We have lost a race with some other client. 264 */ 265 mem_free(cs, sizeof(*cs)); 266 goto recheck_socket; 267 } 268 mtx_init(&cs->cs_lock, "cs->cs_lock", NULL, MTX_DEF); 269 cs->cs_refs = 1; 270 TAILQ_INIT(&cs->cs_pending); 271 so->so_upcallarg = cs; 272 so->so_upcall = clnt_dg_soupcall; 273 so->so_rcv.sb_flags |= SB_UPCALL; 274 } 275 SOCKBUF_UNLOCK(&so->so_rcv); 276 277 cl->cl_ops = &clnt_dg_ops; 278 cl->cl_private = (caddr_t)(void *)cu; 279 cl->cl_auth = authnone_create(); 280 cl->cl_tp = NULL; 281 cl->cl_netid = NULL; 282 return (cl); 283 err2: 284 if (cl) { 285 mem_free(cl, sizeof (CLIENT)); 286 if (cu) 287 mem_free(cu, sizeof (*cu)); 288 } 289 return (NULL); 290 } 291 292 static enum clnt_stat 293 clnt_dg_call( 294 CLIENT *cl, /* client handle */ 295 rpcproc_t proc, /* procedure number */ 296 xdrproc_t xargs, /* xdr routine for args */ 297 void *argsp, /* pointer to args */ 298 xdrproc_t xresults, /* xdr routine for results */ 299 void *resultsp, /* pointer to results */ 300 struct timeval utimeout) /* seconds to wait before giving up */ 301 { 302 struct cu_data *cu = (struct cu_data *)cl->cl_private; 303 struct cu_socket *cs = (struct cu_socket *) cu->cu_socket->so_upcallarg; 304 XDR xdrs; 305 struct rpc_msg reply_msg; 306 bool_t ok; 307 int nrefreshes = 2; /* number of times to refresh cred */ 308 struct timeval timeout; 309 struct timeval retransmit_time; 310 struct timeval next_sendtime, starttime, time_waited, tv; 311 struct sockaddr *sa; 312 socklen_t salen; 313 uint32_t xid; 314 struct mbuf *mreq = NULL; 315 struct cu_request cr; 316 int error; 317 318 mtx_lock(&cs->cs_lock); 319 320 cr.cr_mrep = NULL; 321 cr.cr_error = 0; 322 323 if (cu->cu_total.tv_usec == -1) { 324 timeout = utimeout; /* use supplied timeout */ 325 } else { 326 timeout = cu->cu_total; /* use default timeout */ 327 } 328 329 if (cu->cu_connect && !cu->cu_connected) { 330 mtx_unlock(&cs->cs_lock); 331 error = soconnect(cu->cu_socket, 332 (struct sockaddr *)&cu->cu_raddr, curthread); 333 mtx_lock(&cs->cs_lock); 334 if (error) { 335 cu->cu_error.re_errno = error; 336 cu->cu_error.re_status = RPC_CANTSEND; 337 goto out; 338 } 339 cu->cu_connected = 1; 340 } 341 if (cu->cu_connected) { 342 sa = NULL; 343 salen = 0; 344 } else { 345 sa = (struct sockaddr *)&cu->cu_raddr; 346 salen = cu->cu_rlen; 347 } 348 time_waited.tv_sec = 0; 349 time_waited.tv_usec = 0; 350 retransmit_time = next_sendtime = cu->cu_wait; 351 352 getmicrotime(&starttime); 353 354 call_again: 355 mtx_assert(&cs->cs_lock, MA_OWNED); 356 357 cu->cu_xid++; 358 xid = cu->cu_xid; 359 360 send_again: 361 mtx_unlock(&cs->cs_lock); 362 363 MGETHDR(mreq, M_WAIT, MT_DATA); 364 MCLGET(mreq, M_WAIT); 365 mreq->m_len = 0; 366 m_append(mreq, cu->cu_mcalllen, cu->cu_mcallc); 367 368 /* 369 * The XID is the first thing in the request. 370 */ 371 *mtod(mreq, uint32_t *) = htonl(xid); 372 373 xdrmbuf_create(&xdrs, mreq, XDR_ENCODE); 374 375 if (cu->cu_async == TRUE && xargs == NULL) 376 goto get_reply; 377 378 if ((! XDR_PUTINT32(&xdrs, &proc)) || 379 (! AUTH_MARSHALL(cl->cl_auth, &xdrs)) || 380 (! (*xargs)(&xdrs, argsp))) { 381 cu->cu_error.re_status = RPC_CANTENCODEARGS; 382 mtx_lock(&cs->cs_lock); 383 goto out; 384 } 385 m_fixhdr(mreq); 386 387 cr.cr_xid = xid; 388 mtx_lock(&cs->cs_lock); 389 TAILQ_INSERT_TAIL(&cs->cs_pending, &cr, cr_link); 390 mtx_unlock(&cs->cs_lock); 391 392 /* 393 * sosend consumes mreq. 394 */ 395 error = sosend(cu->cu_socket, sa, NULL, mreq, NULL, 0, curthread); 396 mreq = NULL; 397 398 /* 399 * sub-optimal code appears here because we have 400 * some clock time to spare while the packets are in flight. 401 * (We assume that this is actually only executed once.) 402 */ 403 reply_msg.acpted_rply.ar_verf = _null_auth; 404 reply_msg.acpted_rply.ar_results.where = resultsp; 405 reply_msg.acpted_rply.ar_results.proc = xresults; 406 407 mtx_lock(&cs->cs_lock); 408 if (error) { 409 TAILQ_REMOVE(&cs->cs_pending, &cr, cr_link); 410 411 cu->cu_error.re_errno = error; 412 cu->cu_error.re_status = RPC_CANTSEND; 413 goto out; 414 } 415 416 /* 417 * Check to see if we got an upcall while waiting for the 418 * lock. In both these cases, the request has been removed 419 * from cs->cs_pending. 420 */ 421 if (cr.cr_error) { 422 cu->cu_error.re_errno = cr.cr_error; 423 cu->cu_error.re_status = RPC_CANTRECV; 424 goto out; 425 } 426 if (cr.cr_mrep) { 427 goto got_reply; 428 } 429 430 /* 431 * Hack to provide rpc-based message passing 432 */ 433 if (timeout.tv_sec == 0 && timeout.tv_usec == 0) { 434 if (cr.cr_xid) 435 TAILQ_REMOVE(&cs->cs_pending, &cr, cr_link); 436 cu->cu_error.re_status = RPC_TIMEDOUT; 437 goto out; 438 } 439 440 get_reply: 441 for (;;) { 442 /* Decide how long to wait. */ 443 if (timevalcmp(&next_sendtime, &timeout, <)) { 444 tv = next_sendtime; 445 } else { 446 tv = timeout; 447 } 448 timevalsub(&tv, &time_waited); 449 if (tv.tv_sec < 0 || tv.tv_usec < 0) 450 tv.tv_sec = tv.tv_usec = 0; 451 452 error = msleep(&cr, &cs->cs_lock, cu->cu_waitflag, 453 cu->cu_waitchan, tvtohz(&tv)); 454 455 if (!error) { 456 /* 457 * We were woken up by the upcall. If the 458 * upcall had a receive error, report that, 459 * otherwise we have a reply. 460 */ 461 if (cr.cr_error) { 462 cu->cu_error.re_errno = cr.cr_error; 463 cu->cu_error.re_status = RPC_CANTRECV; 464 goto out; 465 } 466 break; 467 } 468 469 /* 470 * The sleep returned an error so our request is still 471 * on the list. If we got EWOULDBLOCK, we may want to 472 * re-send the request. 473 */ 474 if (error != EWOULDBLOCK) { 475 if (cr.cr_xid) 476 TAILQ_REMOVE(&cs->cs_pending, &cr, cr_link); 477 cu->cu_error.re_errno = error; 478 if (error == EINTR) 479 cu->cu_error.re_status = RPC_INTR; 480 else 481 cu->cu_error.re_status = RPC_CANTRECV; 482 goto out; 483 } 484 485 getmicrotime(&tv); 486 time_waited = tv; 487 timevalsub(&time_waited, &starttime); 488 489 /* Check for timeout. */ 490 if (timevalcmp(&time_waited, &timeout, >)) { 491 if (cr.cr_xid) 492 TAILQ_REMOVE(&cs->cs_pending, &cr, cr_link); 493 cu->cu_error.re_errno = EWOULDBLOCK; 494 cu->cu_error.re_status = RPC_TIMEDOUT; 495 goto out; 496 } 497 498 /* Retransmit if necessary. */ 499 if (timevalcmp(&time_waited, &next_sendtime, >)) { 500 if (cr.cr_xid) 501 TAILQ_REMOVE(&cs->cs_pending, &cr, cr_link); 502 /* update retransmit_time */ 503 if (retransmit_time.tv_sec < RPC_MAX_BACKOFF) 504 timevaladd(&retransmit_time, &retransmit_time); 505 timevaladd(&next_sendtime, &retransmit_time); 506 goto send_again; 507 } 508 } 509 510 got_reply: 511 /* 512 * Now decode and validate the response. We need to drop the 513 * lock since xdr_replymsg may end up sleeping in malloc. 514 */ 515 mtx_unlock(&cs->cs_lock); 516 517 xdrmbuf_create(&xdrs, cr.cr_mrep, XDR_DECODE); 518 ok = xdr_replymsg(&xdrs, &reply_msg); 519 XDR_DESTROY(&xdrs); 520 cr.cr_mrep = NULL; 521 522 mtx_lock(&cs->cs_lock); 523 524 if (ok) { 525 if ((reply_msg.rm_reply.rp_stat == MSG_ACCEPTED) && 526 (reply_msg.acpted_rply.ar_stat == SUCCESS)) 527 cu->cu_error.re_status = RPC_SUCCESS; 528 else 529 _seterr_reply(&reply_msg, &(cu->cu_error)); 530 531 if (cu->cu_error.re_status == RPC_SUCCESS) { 532 if (! AUTH_VALIDATE(cl->cl_auth, 533 &reply_msg.acpted_rply.ar_verf)) { 534 cu->cu_error.re_status = RPC_AUTHERROR; 535 cu->cu_error.re_why = AUTH_INVALIDRESP; 536 } 537 if (reply_msg.acpted_rply.ar_verf.oa_base != NULL) { 538 xdrs.x_op = XDR_FREE; 539 (void) xdr_opaque_auth(&xdrs, 540 &(reply_msg.acpted_rply.ar_verf)); 541 } 542 } /* end successful completion */ 543 /* 544 * If unsuccesful AND error is an authentication error 545 * then refresh credentials and try again, else break 546 */ 547 else if (cu->cu_error.re_status == RPC_AUTHERROR) 548 /* maybe our credentials need to be refreshed ... */ 549 if (nrefreshes > 0 && 550 AUTH_REFRESH(cl->cl_auth, &reply_msg)) { 551 nrefreshes--; 552 goto call_again; 553 } 554 /* end of unsuccessful completion */ 555 } /* end of valid reply message */ 556 else { 557 cu->cu_error.re_status = RPC_CANTDECODERES; 558 559 } 560 out: 561 mtx_assert(&cs->cs_lock, MA_OWNED); 562 563 if (mreq) 564 m_freem(mreq); 565 if (cr.cr_mrep) 566 m_freem(cr.cr_mrep); 567 568 mtx_unlock(&cs->cs_lock); 569 return (cu->cu_error.re_status); 570 } 571 572 static void 573 clnt_dg_geterr(CLIENT *cl, struct rpc_err *errp) 574 { 575 struct cu_data *cu = (struct cu_data *)cl->cl_private; 576 577 *errp = cu->cu_error; 578 } 579 580 static bool_t 581 clnt_dg_freeres(CLIENT *cl, xdrproc_t xdr_res, void *res_ptr) 582 { 583 XDR xdrs; 584 bool_t dummy; 585 586 xdrs.x_op = XDR_FREE; 587 dummy = (*xdr_res)(&xdrs, res_ptr); 588 589 return (dummy); 590 } 591 592 /*ARGSUSED*/ 593 static void 594 clnt_dg_abort(CLIENT *h) 595 { 596 } 597 598 static bool_t 599 clnt_dg_control(CLIENT *cl, u_int request, void *info) 600 { 601 struct cu_data *cu = (struct cu_data *)cl->cl_private; 602 struct cu_socket *cs = (struct cu_socket *) cu->cu_socket->so_upcallarg; 603 struct sockaddr *addr; 604 605 mtx_lock(&cs->cs_lock); 606 607 switch (request) { 608 case CLSET_FD_CLOSE: 609 cu->cu_closeit = TRUE; 610 mtx_unlock(&cs->cs_lock); 611 return (TRUE); 612 case CLSET_FD_NCLOSE: 613 cu->cu_closeit = FALSE; 614 mtx_unlock(&cs->cs_lock); 615 return (TRUE); 616 } 617 618 /* for other requests which use info */ 619 if (info == NULL) { 620 mtx_unlock(&cs->cs_lock); 621 return (FALSE); 622 } 623 switch (request) { 624 case CLSET_TIMEOUT: 625 if (time_not_ok((struct timeval *)info)) { 626 mtx_unlock(&cs->cs_lock); 627 return (FALSE); 628 } 629 cu->cu_total = *(struct timeval *)info; 630 break; 631 case CLGET_TIMEOUT: 632 *(struct timeval *)info = cu->cu_total; 633 break; 634 case CLSET_RETRY_TIMEOUT: 635 if (time_not_ok((struct timeval *)info)) { 636 mtx_unlock(&cs->cs_lock); 637 return (FALSE); 638 } 639 cu->cu_wait = *(struct timeval *)info; 640 break; 641 case CLGET_RETRY_TIMEOUT: 642 *(struct timeval *)info = cu->cu_wait; 643 break; 644 case CLGET_SVC_ADDR: 645 /* 646 * Slightly different semantics to userland - we use 647 * sockaddr instead of netbuf. 648 */ 649 memcpy(info, &cu->cu_raddr, cu->cu_raddr.ss_len); 650 break; 651 case CLSET_SVC_ADDR: /* set to new address */ 652 addr = (struct sockaddr *)info; 653 (void) memcpy(&cu->cu_raddr, addr, addr->sa_len); 654 break; 655 case CLGET_XID: 656 *(uint32_t *)info = cu->cu_xid; 657 break; 658 659 case CLSET_XID: 660 /* This will set the xid of the NEXT call */ 661 /* decrement by 1 as clnt_dg_call() increments once */ 662 cu->cu_xid = *(uint32_t *)info - 1; 663 break; 664 665 case CLGET_VERS: 666 /* 667 * This RELIES on the information that, in the call body, 668 * the version number field is the fifth field from the 669 * begining of the RPC header. MUST be changed if the 670 * call_struct is changed 671 */ 672 *(uint32_t *)info = 673 ntohl(*(uint32_t *)(void *)(cu->cu_mcallc + 674 4 * BYTES_PER_XDR_UNIT)); 675 break; 676 677 case CLSET_VERS: 678 *(uint32_t *)(void *)(cu->cu_mcallc + 4 * BYTES_PER_XDR_UNIT) 679 = htonl(*(uint32_t *)info); 680 break; 681 682 case CLGET_PROG: 683 /* 684 * This RELIES on the information that, in the call body, 685 * the program number field is the fourth field from the 686 * begining of the RPC header. MUST be changed if the 687 * call_struct is changed 688 */ 689 *(uint32_t *)info = 690 ntohl(*(uint32_t *)(void *)(cu->cu_mcallc + 691 3 * BYTES_PER_XDR_UNIT)); 692 break; 693 694 case CLSET_PROG: 695 *(uint32_t *)(void *)(cu->cu_mcallc + 3 * BYTES_PER_XDR_UNIT) 696 = htonl(*(uint32_t *)info); 697 break; 698 case CLSET_ASYNC: 699 cu->cu_async = *(int *)info; 700 break; 701 case CLSET_CONNECT: 702 cu->cu_connect = *(int *)info; 703 break; 704 case CLSET_WAITCHAN: 705 cu->cu_waitchan = *(const char **)info; 706 break; 707 case CLGET_WAITCHAN: 708 *(const char **) info = cu->cu_waitchan; 709 break; 710 case CLSET_INTERRUPTIBLE: 711 if (*(int *) info) 712 cu->cu_waitflag = PCATCH; 713 else 714 cu->cu_waitflag = 0; 715 break; 716 case CLGET_INTERRUPTIBLE: 717 if (cu->cu_waitflag) 718 *(int *) info = TRUE; 719 else 720 *(int *) info = FALSE; 721 break; 722 default: 723 mtx_unlock(&cs->cs_lock); 724 return (FALSE); 725 } 726 mtx_unlock(&cs->cs_lock); 727 return (TRUE); 728 } 729 730 static void 731 clnt_dg_destroy(CLIENT *cl) 732 { 733 struct cu_data *cu = (struct cu_data *)cl->cl_private; 734 struct cu_socket *cs = (struct cu_socket *) cu->cu_socket->so_upcallarg; 735 struct socket *so = NULL; 736 bool_t lastsocketref; 737 738 SOCKBUF_LOCK(&cu->cu_socket->so_rcv); 739 740 mtx_lock(&cs->cs_lock); 741 cs->cs_refs--; 742 if (cs->cs_refs == 0) { 743 cu->cu_socket->so_upcallarg = NULL; 744 cu->cu_socket->so_upcall = NULL; 745 cu->cu_socket->so_rcv.sb_flags &= ~SB_UPCALL; 746 mtx_destroy(&cs->cs_lock); 747 SOCKBUF_UNLOCK(&cu->cu_socket->so_rcv); 748 mem_free(cs, sizeof(*cs)); 749 lastsocketref = TRUE; 750 } else { 751 mtx_unlock(&cs->cs_lock); 752 SOCKBUF_UNLOCK(&cu->cu_socket->so_rcv); 753 lastsocketref = FALSE; 754 } 755 756 if (cu->cu_closeit) { 757 KASSERT(lastsocketref, ("clnt_dg_destroy(): closing a socket " 758 "shared with other clients")); 759 so = cu->cu_socket; 760 cu->cu_socket = NULL; 761 } 762 763 if (so) 764 soclose(so); 765 766 if (cl->cl_netid && cl->cl_netid[0]) 767 mem_free(cl->cl_netid, strlen(cl->cl_netid) +1); 768 if (cl->cl_tp && cl->cl_tp[0]) 769 mem_free(cl->cl_tp, strlen(cl->cl_tp) +1); 770 mem_free(cu, sizeof (*cu)); 771 mem_free(cl, sizeof (CLIENT)); 772 } 773 774 /* 775 * Make sure that the time is not garbage. -1 value is allowed. 776 */ 777 static bool_t 778 time_not_ok(struct timeval *t) 779 { 780 return (t->tv_sec < -1 || t->tv_sec > 100000000 || 781 t->tv_usec < -1 || t->tv_usec > 1000000); 782 } 783 784 void 785 clnt_dg_soupcall(struct socket *so, void *arg, int waitflag) 786 { 787 struct cu_socket *cs = (struct cu_socket *) arg; 788 struct uio uio; 789 struct mbuf *m; 790 struct mbuf *control; 791 struct cu_request *cr; 792 int error, rcvflag, foundreq; 793 uint32_t xid; 794 795 uio.uio_resid = 1000000000; 796 uio.uio_td = curthread; 797 do { 798 m = NULL; 799 control = NULL; 800 rcvflag = MSG_DONTWAIT; 801 error = soreceive(so, NULL, &uio, &m, &control, &rcvflag); 802 if (control) 803 m_freem(control); 804 805 if (error == EWOULDBLOCK) 806 break; 807 808 /* 809 * If there was an error, wake up all pending 810 * requests. 811 */ 812 if (error) { 813 mtx_lock(&cs->cs_lock); 814 TAILQ_FOREACH(cr, &cs->cs_pending, cr_link) { 815 cr->cr_error = error; 816 wakeup(cr); 817 } 818 TAILQ_INIT(&cs->cs_pending); 819 mtx_unlock(&cs->cs_lock); 820 break; 821 } 822 823 /* 824 * The XID is in the first uint32_t of the reply. 825 */ 826 m = m_pullup(m, sizeof(xid)); 827 if (!m) 828 break; 829 xid = ntohl(*mtod(m, uint32_t *)); 830 831 /* 832 * Attempt to match this reply with a pending request. 833 */ 834 mtx_lock(&cs->cs_lock); 835 foundreq = 0; 836 TAILQ_FOREACH(cr, &cs->cs_pending, cr_link) { 837 if (cr->cr_xid == xid) { 838 /* 839 * This one matches. We snip it out of 840 * the pending list and leave the 841 * reply mbuf in cr->cr_mrep. Set the 842 * XID to zero so that clnt_dg_call 843 * can know not to repeat the 844 * TAILQ_REMOVE. 845 */ 846 TAILQ_REMOVE(&cs->cs_pending, cr, cr_link); 847 cr->cr_xid = 0; 848 cr->cr_mrep = m; 849 cr->cr_error = 0; 850 foundreq = 1; 851 wakeup(cr); 852 break; 853 } 854 } 855 mtx_unlock(&cs->cs_lock); 856 857 /* 858 * If we didn't find the matching request, just drop 859 * it - its probably a repeated reply. 860 */ 861 if (!foundreq) 862 m_freem(m); 863 } while (m); 864 } 865
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