clnt_vc.c revision 75094
1/* $NetBSD: clnt_vc.c,v 1.4 2000/07/14 08:40:42 fvdl Exp $ */ 2/* $FreeBSD: head/lib/libc/rpc/clnt_vc.c 75094 2001-04-02 21:41:44Z iedowse $ */ 3 4/* 5 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 6 * unrestricted use provided that this legend is included on all tape 7 * media and as a part of the software program in whole or part. Users 8 * may copy or modify Sun RPC without charge, but are not authorized 9 * to license or distribute it to anyone else except as part of a product or 10 * program developed by the user. 11 * 12 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 13 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 14 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 15 * 16 * Sun RPC is provided with no support and without any obligation on the 17 * part of Sun Microsystems, Inc. to assist in its use, correction, 18 * modification or enhancement. 19 * 20 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 21 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 22 * OR ANY PART THEREOF. 23 * 24 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 25 * or profits or other special, indirect and consequential damages, even if 26 * Sun has been advised of the possibility of such damages. 27 * 28 * Sun Microsystems, Inc. 29 * 2550 Garcia Avenue 30 * Mountain View, California 94043 31 */ 32 33#include <sys/cdefs.h> 34#if defined(LIBC_SCCS) && !defined(lint) 35static char *sccsid = "@(#)clnt_tcp.c 1.37 87/10/05 Copyr 1984 Sun Micro"; 36static char *sccsid = "@(#)clnt_tcp.c 2.2 88/08/01 4.0 RPCSRC"; 37static char sccsid[] = "@(#)clnt_vc.c 1.19 89/03/16 Copyr 1988 Sun Micro"; 38#endif 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 "namespace.h" 60#include "reentrant.h" 61#include <sys/types.h> 62#include <sys/poll.h> 63#include <sys/syslog.h> 64#include <sys/socket.h> 65#include <sys/un.h> 66#include <sys/uio.h> 67 68#include <assert.h> 69#include <err.h> 70#include <errno.h> 71#include <netdb.h> 72#include <stdio.h> 73#include <stdlib.h> 74#include <string.h> 75#include <unistd.h> 76#include <signal.h> 77 78#include <rpc/rpc.h> 79#include "un-namespace.h" 80#include "rpc_com.h" 81 82#define MCALL_MSG_SIZE 24 83 84struct cmessage { 85 struct cmsghdr cmsg; 86 struct cmsgcred cmcred; 87}; 88 89static enum clnt_stat clnt_vc_call __P((CLIENT *, rpcproc_t, xdrproc_t, caddr_t, 90 xdrproc_t, caddr_t, struct timeval)); 91static void clnt_vc_geterr __P((CLIENT *, struct rpc_err *)); 92static bool_t clnt_vc_freeres __P((CLIENT *, xdrproc_t, caddr_t)); 93static void clnt_vc_abort __P((CLIENT *)); 94static bool_t clnt_vc_control __P((CLIENT *, u_int, char *)); 95static void clnt_vc_destroy __P((CLIENT *)); 96static struct clnt_ops *clnt_vc_ops __P((void)); 97static bool_t time_not_ok __P((struct timeval *)); 98static int read_vc __P((caddr_t, caddr_t, int)); 99static int write_vc __P((caddr_t, caddr_t, int)); 100static int __msgwrite(int, void *, size_t); 101static int __msgread(int, void *, size_t); 102 103struct ct_data { 104 int ct_fd; /* connection's fd */ 105 bool_t ct_closeit; /* close it on destroy */ 106 struct timeval ct_wait; /* wait interval in milliseconds */ 107 bool_t ct_waitset; /* wait set by clnt_control? */ 108 struct netbuf ct_addr; /* remote addr */ 109 struct rpc_err ct_error; 110 union { 111 char ct_mcallc[MCALL_MSG_SIZE]; /* marshalled callmsg */ 112 u_int32_t ct_mcalli; 113 } ct_u; 114 u_int ct_mpos; /* pos after marshal */ 115 XDR ct_xdrs; /* XDR stream */ 116}; 117 118/* 119 * This machinery implements per-fd locks for MT-safety. It is not 120 * sufficient to do per-CLIENT handle locks for MT-safety because a 121 * user may create more than one CLIENT handle with the same fd behind 122 * it. Therfore, we allocate an array of flags (vc_fd_locks), protected 123 * by the clnt_fd_lock mutex, and an array (vc_cv) of condition variables 124 * similarly protected. Vc_fd_lock[fd] == 1 => a call is activte on some 125 * CLIENT handle created for that fd. 126 * The current implementation holds locks across the entire RPC and reply. 127 * Yes, this is silly, and as soon as this code is proven to work, this 128 * should be the first thing fixed. One step at a time. 129 */ 130static int *vc_fd_locks; 131extern mutex_t clnt_fd_lock; 132static cond_t *vc_cv; 133#define release_fd_lock(fd, mask) { \ 134 mutex_lock(&clnt_fd_lock); \ 135 if (__isthreaded) \ 136 vc_fd_locks[fd] = 0; \ 137 mutex_unlock(&clnt_fd_lock); \ 138 thr_sigsetmask(SIG_SETMASK, &(mask), (sigset_t *) NULL); \ 139 cond_signal(&vc_cv[fd]); \ 140} 141 142static const char clnt_vc_errstr[] = "%s : %s"; 143static const char clnt_vc_str[] = "clnt_vc_create"; 144static const char clnt_read_vc_str[] = "read_vc"; 145static const char __no_mem_str[] = "out of memory"; 146 147/* 148 * Create a client handle for a connection. 149 * Default options are set, which the user can change using clnt_control()'s. 150 * The rpc/vc package does buffering similar to stdio, so the client 151 * must pick send and receive buffer sizes, 0 => use the default. 152 * NB: fd is copied into a private area. 153 * NB: The rpch->cl_auth is set null authentication. Caller may wish to 154 * set this something more useful. 155 * 156 * fd should be an open socket 157 */ 158CLIENT * 159clnt_vc_create(fd, raddr, prog, vers, sendsz, recvsz) 160 int fd; /* open file descriptor */ 161 const struct netbuf *raddr; /* servers address */ 162 rpcprog_t prog; /* program number */ 163 rpcvers_t vers; /* version number */ 164 u_int sendsz; /* buffer recv size */ 165 u_int recvsz; /* buffer send size */ 166{ 167 CLIENT *cl; /* client handle */ 168 struct ct_data *ct = NULL; /* client handle */ 169 struct timeval now; 170 struct rpc_msg call_msg; 171 static u_int32_t disrupt; 172 sigset_t mask; 173 sigset_t newmask; 174 struct sockaddr_storage ss; 175 socklen_t slen; 176 struct __rpc_sockinfo si; 177 178 if (disrupt == 0) 179 disrupt = (u_int32_t)(long)raddr; 180 181 cl = (CLIENT *)mem_alloc(sizeof (*cl)); 182 ct = (struct ct_data *)mem_alloc(sizeof (*ct)); 183 if ((cl == (CLIENT *)NULL) || (ct == (struct ct_data *)NULL)) { 184 (void) syslog(LOG_ERR, clnt_vc_errstr, 185 clnt_vc_str, __no_mem_str); 186 rpc_createerr.cf_stat = RPC_SYSTEMERROR; 187 rpc_createerr.cf_error.re_errno = errno; 188 goto err; 189 } 190 ct->ct_addr.buf = NULL; 191 sigfillset(&newmask); 192 thr_sigsetmask(SIG_SETMASK, &newmask, &mask); 193 mutex_lock(&clnt_fd_lock); 194 if (vc_fd_locks == (int *) NULL) { 195 int cv_allocsz, fd_allocsz; 196 int dtbsize = __rpc_dtbsize(); 197 198 fd_allocsz = dtbsize * sizeof (int); 199 vc_fd_locks = (int *) mem_alloc(fd_allocsz); 200 if (vc_fd_locks == (int *) NULL) { 201 mutex_unlock(&clnt_fd_lock); 202 thr_sigsetmask(SIG_SETMASK, &(mask), NULL); 203 goto err; 204 } else 205 memset(vc_fd_locks, '\0', fd_allocsz); 206 207 assert(vc_cv == (cond_t *) NULL); 208 cv_allocsz = dtbsize * sizeof (cond_t); 209 vc_cv = (cond_t *) mem_alloc(cv_allocsz); 210 if (vc_cv == (cond_t *) NULL) { 211 mem_free(vc_fd_locks, fd_allocsz); 212 vc_fd_locks = (int *) NULL; 213 mutex_unlock(&clnt_fd_lock); 214 thr_sigsetmask(SIG_SETMASK, &(mask), NULL); 215 goto err; 216 } else { 217 int i; 218 219 for (i = 0; i < dtbsize; i++) 220 cond_init(&vc_cv[i], 0, (void *) 0); 221 } 222 } else 223 assert(vc_cv != (cond_t *) NULL); 224 225 /* 226 * XXX - fvdl connecting while holding a mutex? 227 */ 228 slen = sizeof ss; 229 if (_getpeername(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) { 230 if (errno != ENOTCONN) { 231 rpc_createerr.cf_stat = RPC_SYSTEMERROR; 232 rpc_createerr.cf_error.re_errno = errno; 233 mutex_unlock(&clnt_fd_lock); 234 goto err; 235 } 236 if (_connect(fd, (struct sockaddr *)raddr->buf, raddr->len) < 0){ 237 rpc_createerr.cf_stat = RPC_SYSTEMERROR; 238 rpc_createerr.cf_error.re_errno = errno; 239 mutex_unlock(&clnt_fd_lock); 240 goto err; 241 } 242 } 243 mutex_unlock(&clnt_fd_lock); 244 if (!__rpc_fd2sockinfo(fd, &si)) 245 goto err; 246 thr_sigsetmask(SIG_SETMASK, &(mask), NULL); 247 248 ct->ct_closeit = FALSE; 249 250 /* 251 * Set up private data struct 252 */ 253 ct->ct_fd = fd; 254 ct->ct_wait.tv_usec = 0; 255 ct->ct_waitset = FALSE; 256 ct->ct_addr.buf = malloc(raddr->maxlen); 257 if (ct->ct_addr.buf == NULL) 258 goto err; 259 memcpy(ct->ct_addr.buf, &raddr->buf, raddr->len); 260 ct->ct_addr.len = raddr->maxlen; 261 ct->ct_addr.maxlen = raddr->maxlen; 262 263 /* 264 * Initialize call message 265 */ 266 (void)gettimeofday(&now, NULL); 267 call_msg.rm_xid = ((u_int32_t)++disrupt) ^ __RPC_GETXID(&now); 268 call_msg.rm_direction = CALL; 269 call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; 270 call_msg.rm_call.cb_prog = (u_int32_t)prog; 271 call_msg.rm_call.cb_vers = (u_int32_t)vers; 272 273 /* 274 * pre-serialize the static part of the call msg and stash it away 275 */ 276 xdrmem_create(&(ct->ct_xdrs), ct->ct_u.ct_mcallc, MCALL_MSG_SIZE, 277 XDR_ENCODE); 278 if (! xdr_callhdr(&(ct->ct_xdrs), &call_msg)) { 279 if (ct->ct_closeit) { 280 (void)_close(fd); 281 } 282 goto err; 283 } 284 ct->ct_mpos = XDR_GETPOS(&(ct->ct_xdrs)); 285 XDR_DESTROY(&(ct->ct_xdrs)); 286 287 /* 288 * Create a client handle which uses xdrrec for serialization 289 * and authnone for authentication. 290 */ 291 cl->cl_ops = clnt_vc_ops(); 292 cl->cl_private = ct; 293 cl->cl_auth = authnone_create(); 294 sendsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsz); 295 recvsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsz); 296 xdrrec_create(&(ct->ct_xdrs), sendsz, recvsz, 297 cl->cl_private, read_vc, write_vc); 298 return (cl); 299 300err: 301 if (cl) { 302 if (ct) { 303 if (ct->ct_addr.len) 304 mem_free(ct->ct_addr.buf, ct->ct_addr.len); 305 mem_free((caddr_t)ct, sizeof (struct ct_data)); 306 } 307 if (cl) 308 mem_free((caddr_t)cl, sizeof (CLIENT)); 309 } 310 return ((CLIENT *)NULL); 311} 312 313static enum clnt_stat 314clnt_vc_call(cl, proc, xdr_args, args_ptr, xdr_results, results_ptr, timeout) 315 CLIENT *cl; 316 rpcproc_t proc; 317 xdrproc_t xdr_args; 318 caddr_t args_ptr; 319 xdrproc_t xdr_results; 320 caddr_t results_ptr; 321 struct timeval timeout; 322{ 323 struct ct_data *ct = (struct ct_data *) cl->cl_private; 324 XDR *xdrs = &(ct->ct_xdrs); 325 struct rpc_msg reply_msg; 326 u_int32_t x_id; 327 u_int32_t *msg_x_id = &ct->ct_u.ct_mcalli; /* yuk */ 328 bool_t shipnow; 329 int refreshes = 2; 330 sigset_t mask, newmask; 331 int rpc_lock_value; 332 333 assert(cl != NULL); 334 335 sigfillset(&newmask); 336 thr_sigsetmask(SIG_SETMASK, &newmask, &mask); 337 mutex_lock(&clnt_fd_lock); 338 while (vc_fd_locks[ct->ct_fd]) 339 cond_wait(&vc_cv[ct->ct_fd], &clnt_fd_lock); 340 if (__isthreaded) 341 rpc_lock_value = 1; 342 else 343 rpc_lock_value = 0; 344 vc_fd_locks[ct->ct_fd] = rpc_lock_value; 345 mutex_unlock(&clnt_fd_lock); 346 if (!ct->ct_waitset) { 347 /* If time is not within limits, we ignore it. */ 348 if (time_not_ok(&timeout) == FALSE) 349 ct->ct_wait = timeout; 350 } 351 352 shipnow = 353 (xdr_results == NULL && timeout.tv_sec == 0 354 && timeout.tv_usec == 0) ? FALSE : TRUE; 355 356call_again: 357 xdrs->x_op = XDR_ENCODE; 358 ct->ct_error.re_status = RPC_SUCCESS; 359 x_id = ntohl(--(*msg_x_id)); 360 361 if ((! XDR_PUTBYTES(xdrs, ct->ct_u.ct_mcallc, ct->ct_mpos)) || 362 (! XDR_PUTINT32(xdrs, &proc)) || 363 (! AUTH_MARSHALL(cl->cl_auth, xdrs)) || 364 (! (*xdr_args)(xdrs, args_ptr))) { 365 if (ct->ct_error.re_status == RPC_SUCCESS) 366 ct->ct_error.re_status = RPC_CANTENCODEARGS; 367 (void)xdrrec_endofrecord(xdrs, TRUE); 368 release_fd_lock(ct->ct_fd, mask); 369 return (ct->ct_error.re_status); 370 } 371 if (! xdrrec_endofrecord(xdrs, shipnow)) { 372 release_fd_lock(ct->ct_fd, mask); 373 return (ct->ct_error.re_status = RPC_CANTSEND); 374 } 375 if (! shipnow) { 376 release_fd_lock(ct->ct_fd, mask); 377 return (RPC_SUCCESS); 378 } 379 /* 380 * Hack to provide rpc-based message passing 381 */ 382 if (timeout.tv_sec == 0 && timeout.tv_usec == 0) { 383 release_fd_lock(ct->ct_fd, mask); 384 return(ct->ct_error.re_status = RPC_TIMEDOUT); 385 } 386 387 388 /* 389 * Keep receiving until we get a valid transaction id 390 */ 391 xdrs->x_op = XDR_DECODE; 392 while (TRUE) { 393 reply_msg.acpted_rply.ar_verf = _null_auth; 394 reply_msg.acpted_rply.ar_results.where = NULL; 395 reply_msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void; 396 if (! xdrrec_skiprecord(xdrs)) { 397 release_fd_lock(ct->ct_fd, mask); 398 return (ct->ct_error.re_status); 399 } 400 /* now decode and validate the response header */ 401 if (! xdr_replymsg(xdrs, &reply_msg)) { 402 if (ct->ct_error.re_status == RPC_SUCCESS) 403 continue; 404 release_fd_lock(ct->ct_fd, mask); 405 return (ct->ct_error.re_status); 406 } 407 if (reply_msg.rm_xid == x_id) 408 break; 409 } 410 411 /* 412 * process header 413 */ 414 _seterr_reply(&reply_msg, &(ct->ct_error)); 415 if (ct->ct_error.re_status == RPC_SUCCESS) { 416 if (! AUTH_VALIDATE(cl->cl_auth, 417 &reply_msg.acpted_rply.ar_verf)) { 418 ct->ct_error.re_status = RPC_AUTHERROR; 419 ct->ct_error.re_why = AUTH_INVALIDRESP; 420 } else if (! (*xdr_results)(xdrs, results_ptr)) { 421 if (ct->ct_error.re_status == RPC_SUCCESS) 422 ct->ct_error.re_status = RPC_CANTDECODERES; 423 } 424 /* free verifier ... */ 425 if (reply_msg.acpted_rply.ar_verf.oa_base != NULL) { 426 xdrs->x_op = XDR_FREE; 427 (void)xdr_opaque_auth(xdrs, 428 &(reply_msg.acpted_rply.ar_verf)); 429 } 430 } /* end successful completion */ 431 else { 432 /* maybe our credentials need to be refreshed ... */ 433 if (refreshes-- && AUTH_REFRESH(cl->cl_auth, &reply_msg)) 434 goto call_again; 435 } /* end of unsuccessful completion */ 436 release_fd_lock(ct->ct_fd, mask); 437 return (ct->ct_error.re_status); 438} 439 440static void 441clnt_vc_geterr(cl, errp) 442 CLIENT *cl; 443 struct rpc_err *errp; 444{ 445 struct ct_data *ct; 446 447 assert(cl != NULL); 448 assert(errp != NULL); 449 450 ct = (struct ct_data *) cl->cl_private; 451 *errp = ct->ct_error; 452} 453 454static bool_t 455clnt_vc_freeres(cl, xdr_res, res_ptr) 456 CLIENT *cl; 457 xdrproc_t xdr_res; 458 caddr_t res_ptr; 459{ 460 struct ct_data *ct; 461 XDR *xdrs; 462 bool_t dummy; 463 sigset_t mask; 464 sigset_t newmask; 465 466 assert(cl != NULL); 467 468 ct = (struct ct_data *)cl->cl_private; 469 xdrs = &(ct->ct_xdrs); 470 471 sigfillset(&newmask); 472 thr_sigsetmask(SIG_SETMASK, &newmask, &mask); 473 mutex_lock(&clnt_fd_lock); 474 while (vc_fd_locks[ct->ct_fd]) 475 cond_wait(&vc_cv[ct->ct_fd], &clnt_fd_lock); 476 xdrs->x_op = XDR_FREE; 477 dummy = (*xdr_res)(xdrs, res_ptr); 478 mutex_unlock(&clnt_fd_lock); 479 thr_sigsetmask(SIG_SETMASK, &(mask), NULL); 480 cond_signal(&vc_cv[ct->ct_fd]); 481 482 return dummy; 483} 484 485/*ARGSUSED*/ 486static void 487clnt_vc_abort(cl) 488 CLIENT *cl; 489{ 490} 491 492static bool_t 493clnt_vc_control(cl, request, info) 494 CLIENT *cl; 495 u_int request; 496 char *info; 497{ 498 struct ct_data *ct; 499 void *infop = info; 500 sigset_t mask; 501 sigset_t newmask; 502 int rpc_lock_value; 503 504 assert(cl != NULL); 505 506 ct = (struct ct_data *)cl->cl_private; 507 508 sigfillset(&newmask); 509 thr_sigsetmask(SIG_SETMASK, &newmask, &mask); 510 mutex_lock(&clnt_fd_lock); 511 while (vc_fd_locks[ct->ct_fd]) 512 cond_wait(&vc_cv[ct->ct_fd], &clnt_fd_lock); 513 if (__isthreaded) 514 rpc_lock_value = 1; 515 else 516 rpc_lock_value = 0; 517 vc_fd_locks[ct->ct_fd] = rpc_lock_value; 518 mutex_unlock(&clnt_fd_lock); 519 520 switch (request) { 521 case CLSET_FD_CLOSE: 522 ct->ct_closeit = TRUE; 523 release_fd_lock(ct->ct_fd, mask); 524 return (TRUE); 525 case CLSET_FD_NCLOSE: 526 ct->ct_closeit = FALSE; 527 release_fd_lock(ct->ct_fd, mask); 528 return (TRUE); 529 default: 530 break; 531 } 532 533 /* for other requests which use info */ 534 if (info == NULL) { 535 release_fd_lock(ct->ct_fd, mask); 536 return (FALSE); 537 } 538 switch (request) { 539 case CLSET_TIMEOUT: 540 if (time_not_ok((struct timeval *)(void *)info)) { 541 release_fd_lock(ct->ct_fd, mask); 542 return (FALSE); 543 } 544 ct->ct_wait = *(struct timeval *)infop; 545 ct->ct_waitset = TRUE; 546 break; 547 case CLGET_TIMEOUT: 548 *(struct timeval *)infop = ct->ct_wait; 549 break; 550 case CLGET_SERVER_ADDR: 551 (void) memcpy(info, ct->ct_addr.buf, (size_t)ct->ct_addr.len); 552 break; 553 case CLGET_FD: 554 *(int *)(void *)info = ct->ct_fd; 555 break; 556 case CLGET_SVC_ADDR: 557 /* The caller should not free this memory area */ 558 *(struct netbuf *)(void *)info = ct->ct_addr; 559 break; 560 case CLSET_SVC_ADDR: /* set to new address */ 561 release_fd_lock(ct->ct_fd, mask); 562 return (FALSE); 563 case CLGET_XID: 564 /* 565 * use the knowledge that xid is the 566 * first element in the call structure 567 * This will get the xid of the PREVIOUS call 568 */ 569 *(u_int32_t *)(void *)info = 570 ntohl(*(u_int32_t *)(void *)&ct->ct_u.ct_mcalli); 571 break; 572 case CLSET_XID: 573 /* This will set the xid of the NEXT call */ 574 *(u_int32_t *)(void *)&ct->ct_u.ct_mcalli = 575 htonl(*((u_int32_t *)(void *)info) + 1); 576 /* increment by 1 as clnt_vc_call() decrements once */ 577 break; 578 case CLGET_VERS: 579 /* 580 * This RELIES on the information that, in the call body, 581 * the version number field is the fifth field from the 582 * begining of the RPC header. MUST be changed if the 583 * call_struct is changed 584 */ 585 *(u_int32_t *)(void *)info = 586 ntohl(*(u_int32_t *)(void *)(ct->ct_u.ct_mcallc + 587 4 * BYTES_PER_XDR_UNIT)); 588 break; 589 590 case CLSET_VERS: 591 *(u_int32_t *)(void *)(ct->ct_u.ct_mcallc + 592 4 * BYTES_PER_XDR_UNIT) = 593 htonl(*(u_int32_t *)(void *)info); 594 break; 595 596 case CLGET_PROG: 597 /* 598 * This RELIES on the information that, in the call body, 599 * the program number field is the fourth field from the 600 * begining of the RPC header. MUST be changed if the 601 * call_struct is changed 602 */ 603 *(u_int32_t *)(void *)info = 604 ntohl(*(u_int32_t *)(void *)(ct->ct_u.ct_mcallc + 605 3 * BYTES_PER_XDR_UNIT)); 606 break; 607 608 case CLSET_PROG: 609 *(u_int32_t *)(void *)(ct->ct_u.ct_mcallc + 610 3 * BYTES_PER_XDR_UNIT) = 611 htonl(*(u_int32_t *)(void *)info); 612 break; 613 614 default: 615 release_fd_lock(ct->ct_fd, mask); 616 return (FALSE); 617 } 618 release_fd_lock(ct->ct_fd, mask); 619 return (TRUE); 620} 621 622 623static void 624clnt_vc_destroy(cl) 625 CLIENT *cl; 626{ 627 struct ct_data *ct = (struct ct_data *) cl->cl_private; 628 int ct_fd = ct->ct_fd; 629 sigset_t mask; 630 sigset_t newmask; 631 632 assert(cl != NULL); 633 634 ct = (struct ct_data *) cl->cl_private; 635 636 sigfillset(&newmask); 637 thr_sigsetmask(SIG_SETMASK, &newmask, &mask); 638 mutex_lock(&clnt_fd_lock); 639 while (vc_fd_locks[ct_fd]) 640 cond_wait(&vc_cv[ct_fd], &clnt_fd_lock); 641 if (ct->ct_closeit && ct->ct_fd != -1) { 642 (void)_close(ct->ct_fd); 643 } 644 XDR_DESTROY(&(ct->ct_xdrs)); 645 if (ct->ct_addr.buf) 646 free(ct->ct_addr.buf); 647 mem_free(ct, sizeof(struct ct_data)); 648 mem_free(cl, sizeof(CLIENT)); 649 mutex_unlock(&clnt_fd_lock); 650 thr_sigsetmask(SIG_SETMASK, &(mask), NULL); 651 cond_signal(&vc_cv[ct_fd]); 652} 653 654/* 655 * Interface between xdr serializer and tcp connection. 656 * Behaves like the system calls, read & write, but keeps some error state 657 * around for the rpc level. 658 */ 659static int 660read_vc(ctp, buf, len) 661 caddr_t ctp; 662 caddr_t buf; 663 int len; 664{ 665 struct sockaddr sa; 666 socklen_t sal; 667 struct ct_data *ct = (struct ct_data *)(void *)ctp; 668 struct pollfd fd; 669 int milliseconds = (int)((ct->ct_wait.tv_sec * 1000) + 670 (ct->ct_wait.tv_usec / 1000)); 671 672 if (len == 0) 673 return (0); 674 fd.fd = ct->ct_fd; 675 fd.events = POLLIN; 676 for (;;) { 677 switch (_poll(&fd, 1, milliseconds)) { 678 case 0: 679 ct->ct_error.re_status = RPC_TIMEDOUT; 680 return (-1); 681 682 case -1: 683 if (errno == EINTR) 684 continue; 685 ct->ct_error.re_status = RPC_CANTRECV; 686 ct->ct_error.re_errno = errno; 687 return (-1); 688 } 689 break; 690 } 691 692 sal = sizeof(sa); 693 if ((_getpeername(ct->ct_fd, &sa, &sal) == 0) && 694 (sa.sa_family == AF_LOCAL)) { 695 len = __msgread(ct->ct_fd, buf, (size_t)len); 696 } else { 697 len = _read(ct->ct_fd, buf, (size_t)len); 698 } 699 700 switch (len) { 701 case 0: 702 /* premature eof */ 703 ct->ct_error.re_errno = ECONNRESET; 704 ct->ct_error.re_status = RPC_CANTRECV; 705 len = -1; /* it's really an error */ 706 break; 707 708 case -1: 709 ct->ct_error.re_errno = errno; 710 ct->ct_error.re_status = RPC_CANTRECV; 711 break; 712 } 713 return (len); 714} 715 716static int 717write_vc(ctp, buf, len) 718 caddr_t ctp; 719 caddr_t buf; 720 int len; 721{ 722 struct sockaddr sa; 723 socklen_t sal; 724 struct ct_data *ct = (struct ct_data *)(void *)ctp; 725 int i, cnt; 726 727 sal = sizeof(sa); 728 if ((_getpeername(ct->ct_fd, &sa, &sal) == 0) && 729 (sa.sa_family == AF_LOCAL)) { 730 for (cnt = len; cnt > 0; cnt -= i, buf += i) { 731 if ((i = __msgwrite(ct->ct_fd, buf, 732 (size_t)cnt)) == -1) { 733 ct->ct_error.re_errno = errno; 734 ct->ct_error.re_status = RPC_CANTSEND; 735 return (-1); 736 } 737 } 738 } else { 739 for (cnt = len; cnt > 0; cnt -= i, buf += i) { 740 if ((i = _write(ct->ct_fd, buf, (size_t)cnt)) == -1) { 741 ct->ct_error.re_errno = errno; 742 ct->ct_error.re_status = RPC_CANTSEND; 743 return (-1); 744 } 745 } 746 } 747 return (len); 748} 749 750static struct clnt_ops * 751clnt_vc_ops() 752{ 753 static struct clnt_ops ops; 754 extern mutex_t ops_lock; 755 sigset_t mask, newmask; 756 757 /* VARIABLES PROTECTED BY ops_lock: ops */ 758 759 sigfillset(&newmask); 760 thr_sigsetmask(SIG_SETMASK, &newmask, &mask); 761 mutex_lock(&ops_lock); 762 if (ops.cl_call == NULL) { 763 ops.cl_call = clnt_vc_call; 764 ops.cl_abort = clnt_vc_abort; 765 ops.cl_geterr = clnt_vc_geterr; 766 ops.cl_freeres = clnt_vc_freeres; 767 ops.cl_destroy = clnt_vc_destroy; 768 ops.cl_control = clnt_vc_control; 769 } 770 mutex_unlock(&ops_lock); 771 thr_sigsetmask(SIG_SETMASK, &(mask), NULL); 772 return (&ops); 773} 774 775/* 776 * Make sure that the time is not garbage. -1 value is disallowed. 777 * Note this is different from time_not_ok in clnt_dg.c 778 */ 779static bool_t 780time_not_ok(t) 781 struct timeval *t; 782{ 783 return (t->tv_sec <= -1 || t->tv_sec > 100000000 || 784 t->tv_usec <= -1 || t->tv_usec > 1000000); 785} 786 787static int 788__msgread(sock, buf, cnt) 789 int sock; 790 void *buf; 791 size_t cnt; 792{ 793 struct iovec iov[1]; 794 struct msghdr msg; 795 struct cmessage cm; 796 797 bzero((char *)&cm, sizeof(cm)); 798 iov[0].iov_base = buf; 799 iov[0].iov_len = cnt; 800 801 msg.msg_iov = iov; 802 msg.msg_iovlen = 1; 803 msg.msg_name = NULL; 804 msg.msg_namelen = 0; 805 msg.msg_control = (caddr_t)&cm; 806 msg.msg_controllen = sizeof(struct cmessage); 807 msg.msg_flags = 0; 808 809 return(_recvmsg(sock, &msg, 0)); 810} 811 812static int 813__msgwrite(sock, buf, cnt) 814 int sock; 815 void *buf; 816 size_t cnt; 817{ 818 struct iovec iov[1]; 819 struct msghdr msg; 820 struct cmessage cm; 821 822 bzero((char *)&cm, sizeof(cm)); 823 iov[0].iov_base = buf; 824 iov[0].iov_len = cnt; 825 826 cm.cmsg.cmsg_type = SCM_CREDS; 827 cm.cmsg.cmsg_level = SOL_SOCKET; 828 cm.cmsg.cmsg_len = sizeof(struct cmessage); 829 830 msg.msg_iov = iov; 831 msg.msg_iovlen = 1; 832 msg.msg_name = NULL; 833 msg.msg_namelen = 0; 834 msg.msg_control = (caddr_t)&cm; 835 msg.msg_controllen = sizeof(struct cmessage); 836 msg.msg_flags = 0; 837 838 return(_sendmsg(sock, &msg, 0)); 839} 840