Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/rpc/svc_vc.c
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1 /* $NetBSD: svc_vc.c,v 1.7 2000/08/03 00:01:53 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 = "@(#)svc_tcp.c 1.21 87/08/11 Copyr 1984 Sun Micro"; 34 static char *sccsid = "@(#)svc_tcp.c 2.2 88/08/01 4.0 RPCSRC"; 35 #endif 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 /* 40 * svc_vc.c, Server side for Connection Oriented based RPC. 41 * 42 * Actually implements two flavors of transporter - 43 * a tcp rendezvouser (a listner and connection establisher) 44 * and a record/tcp stream. 45 */ 46 47 #include <sys/param.h> 48 #include <sys/lock.h> 49 #include <sys/kernel.h> 50 #include <sys/malloc.h> 51 #include <sys/mbuf.h> 52 #include <sys/mutex.h> 53 #include <sys/proc.h> 54 #include <sys/protosw.h> 55 #include <sys/queue.h> 56 #include <sys/socket.h> 57 #include <sys/socketvar.h> 58 #include <sys/sx.h> 59 #include <sys/systm.h> 60 #include <sys/uio.h> 61 62 #include <net/vnet.h> 63 64 #include <netinet/tcp.h> 65 66 #include <rpc/rpc.h> 67 68 #include <rpc/rpc_com.h> 69 70 #include <security/mac/mac_framework.h> 71 72 static bool_t svc_vc_rendezvous_recv(SVCXPRT *, struct rpc_msg *, 73 struct sockaddr **, struct mbuf **); 74 static enum xprt_stat svc_vc_rendezvous_stat(SVCXPRT *); 75 static void svc_vc_rendezvous_destroy(SVCXPRT *); 76 static bool_t svc_vc_null(void); 77 static void svc_vc_destroy(SVCXPRT *); 78 static enum xprt_stat svc_vc_stat(SVCXPRT *); 79 static bool_t svc_vc_recv(SVCXPRT *, struct rpc_msg *, 80 struct sockaddr **, struct mbuf **); 81 static bool_t svc_vc_reply(SVCXPRT *, struct rpc_msg *, 82 struct sockaddr *, struct mbuf *); 83 static bool_t svc_vc_control(SVCXPRT *xprt, const u_int rq, void *in); 84 static bool_t svc_vc_rendezvous_control (SVCXPRT *xprt, const u_int rq, 85 void *in); 86 static SVCXPRT *svc_vc_create_conn(SVCPOOL *pool, struct socket *so, 87 struct sockaddr *raddr); 88 static int svc_vc_accept(struct socket *head, struct socket **sop); 89 static int svc_vc_soupcall(struct socket *so, void *arg, int waitflag); 90 91 static struct xp_ops svc_vc_rendezvous_ops = { 92 .xp_recv = svc_vc_rendezvous_recv, 93 .xp_stat = svc_vc_rendezvous_stat, 94 .xp_reply = (bool_t (*)(SVCXPRT *, struct rpc_msg *, 95 struct sockaddr *, struct mbuf *))svc_vc_null, 96 .xp_destroy = svc_vc_rendezvous_destroy, 97 .xp_control = svc_vc_rendezvous_control 98 }; 99 100 static struct xp_ops svc_vc_ops = { 101 .xp_recv = svc_vc_recv, 102 .xp_stat = svc_vc_stat, 103 .xp_reply = svc_vc_reply, 104 .xp_destroy = svc_vc_destroy, 105 .xp_control = svc_vc_control 106 }; 107 108 struct cf_conn { /* kept in xprt->xp_p1 for actual connection */ 109 enum xprt_stat strm_stat; 110 struct mbuf *mpending; /* unparsed data read from the socket */ 111 struct mbuf *mreq; /* current record being built from mpending */ 112 uint32_t resid; /* number of bytes needed for fragment */ 113 bool_t eor; /* reading last fragment of current record */ 114 }; 115 116 /* 117 * Usage: 118 * xprt = svc_vc_create(sock, send_buf_size, recv_buf_size); 119 * 120 * Creates, registers, and returns a (rpc) tcp based transporter. 121 * Once *xprt is initialized, it is registered as a transporter 122 * see (svc.h, xprt_register). This routine returns 123 * a NULL if a problem occurred. 124 * 125 * The filedescriptor passed in is expected to refer to a bound, but 126 * not yet connected socket. 127 * 128 * Since streams do buffered io similar to stdio, the caller can specify 129 * how big the send and receive buffers are via the second and third parms; 130 * 0 => use the system default. 131 */ 132 SVCXPRT * 133 svc_vc_create(SVCPOOL *pool, struct socket *so, size_t sendsize, 134 size_t recvsize) 135 { 136 SVCXPRT *xprt; 137 struct sockaddr* sa; 138 int error; 139 140 SOCK_LOCK(so); 141 if (so->so_state & (SS_ISCONNECTED|SS_ISDISCONNECTED)) { 142 SOCK_UNLOCK(so); 143 error = so->so_proto->pr_usrreqs->pru_peeraddr(so, &sa); 144 if (error) 145 return (NULL); 146 xprt = svc_vc_create_conn(pool, so, sa); 147 free(sa, M_SONAME); 148 return (xprt); 149 } 150 SOCK_UNLOCK(so); 151 152 xprt = svc_xprt_alloc(); 153 sx_init(&xprt->xp_lock, "xprt->xp_lock"); 154 xprt->xp_pool = pool; 155 xprt->xp_socket = so; 156 xprt->xp_p1 = NULL; 157 xprt->xp_p2 = NULL; 158 xprt->xp_ops = &svc_vc_rendezvous_ops; 159 160 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa); 161 if (error) { 162 goto cleanup_svc_vc_create; 163 } 164 165 memcpy(&xprt->xp_ltaddr, sa, sa->sa_len); 166 free(sa, M_SONAME); 167 168 xprt_register(xprt); 169 170 solisten(so, SOMAXCONN, curthread); 171 172 SOCKBUF_LOCK(&so->so_rcv); 173 xprt->xp_upcallset = 1; 174 soupcall_set(so, SO_RCV, svc_vc_soupcall, xprt); 175 SOCKBUF_UNLOCK(&so->so_rcv); 176 177 return (xprt); 178 cleanup_svc_vc_create: 179 if (xprt) 180 svc_xprt_free(xprt); 181 return (NULL); 182 } 183 184 /* 185 * Create a new transport for a socket optained via soaccept(). 186 */ 187 SVCXPRT * 188 svc_vc_create_conn(SVCPOOL *pool, struct socket *so, struct sockaddr *raddr) 189 { 190 SVCXPRT *xprt = NULL; 191 struct cf_conn *cd = NULL; 192 struct sockaddr* sa = NULL; 193 struct sockopt opt; 194 int one = 1; 195 int error; 196 197 bzero(&opt, sizeof(struct sockopt)); 198 opt.sopt_dir = SOPT_SET; 199 opt.sopt_level = SOL_SOCKET; 200 opt.sopt_name = SO_KEEPALIVE; 201 opt.sopt_val = &one; 202 opt.sopt_valsize = sizeof(one); 203 error = sosetopt(so, &opt); 204 if (error) { 205 return (NULL); 206 } 207 208 if (so->so_proto->pr_protocol == IPPROTO_TCP) { 209 bzero(&opt, sizeof(struct sockopt)); 210 opt.sopt_dir = SOPT_SET; 211 opt.sopt_level = IPPROTO_TCP; 212 opt.sopt_name = TCP_NODELAY; 213 opt.sopt_val = &one; 214 opt.sopt_valsize = sizeof(one); 215 error = sosetopt(so, &opt); 216 if (error) { 217 return (NULL); 218 } 219 } 220 221 cd = mem_alloc(sizeof(*cd)); 222 cd->strm_stat = XPRT_IDLE; 223 224 xprt = svc_xprt_alloc(); 225 sx_init(&xprt->xp_lock, "xprt->xp_lock"); 226 xprt->xp_pool = pool; 227 xprt->xp_socket = so; 228 xprt->xp_p1 = cd; 229 xprt->xp_p2 = NULL; 230 xprt->xp_ops = &svc_vc_ops; 231 232 /* 233 * See http://www.connectathon.org/talks96/nfstcp.pdf - client 234 * has a 5 minute timer, server has a 6 minute timer. 235 */ 236 xprt->xp_idletimeout = 6 * 60; 237 238 memcpy(&xprt->xp_rtaddr, raddr, raddr->sa_len); 239 240 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa); 241 if (error) 242 goto cleanup_svc_vc_create; 243 244 memcpy(&xprt->xp_ltaddr, sa, sa->sa_len); 245 free(sa, M_SONAME); 246 247 xprt_register(xprt); 248 249 SOCKBUF_LOCK(&so->so_rcv); 250 xprt->xp_upcallset = 1; 251 soupcall_set(so, SO_RCV, svc_vc_soupcall, xprt); 252 SOCKBUF_UNLOCK(&so->so_rcv); 253 254 /* 255 * Throw the transport into the active list in case it already 256 * has some data buffered. 257 */ 258 sx_xlock(&xprt->xp_lock); 259 xprt_active(xprt); 260 sx_xunlock(&xprt->xp_lock); 261 262 return (xprt); 263 cleanup_svc_vc_create: 264 if (xprt) { 265 mem_free(xprt, sizeof(*xprt)); 266 } 267 if (cd) 268 mem_free(cd, sizeof(*cd)); 269 return (NULL); 270 } 271 272 /* 273 * This does all of the accept except the final call to soaccept. The 274 * caller will call soaccept after dropping its locks (soaccept may 275 * call malloc). 276 */ 277 int 278 svc_vc_accept(struct socket *head, struct socket **sop) 279 { 280 int error = 0; 281 struct socket *so; 282 283 if ((head->so_options & SO_ACCEPTCONN) == 0) { 284 error = EINVAL; 285 goto done; 286 } 287 #ifdef MAC 288 error = mac_socket_check_accept(curthread->td_ucred, head); 289 if (error != 0) 290 goto done; 291 #endif 292 ACCEPT_LOCK(); 293 if (TAILQ_EMPTY(&head->so_comp)) { 294 ACCEPT_UNLOCK(); 295 error = EWOULDBLOCK; 296 goto done; 297 } 298 so = TAILQ_FIRST(&head->so_comp); 299 KASSERT(!(so->so_qstate & SQ_INCOMP), ("svc_vc_accept: so SQ_INCOMP")); 300 KASSERT(so->so_qstate & SQ_COMP, ("svc_vc_accept: so not SQ_COMP")); 301 302 /* 303 * Before changing the flags on the socket, we have to bump the 304 * reference count. Otherwise, if the protocol calls sofree(), 305 * the socket will be released due to a zero refcount. 306 * XXX might not need soref() since this is simpler than kern_accept. 307 */ 308 SOCK_LOCK(so); /* soref() and so_state update */ 309 soref(so); /* file descriptor reference */ 310 311 TAILQ_REMOVE(&head->so_comp, so, so_list); 312 head->so_qlen--; 313 so->so_state |= (head->so_state & SS_NBIO); 314 so->so_qstate &= ~SQ_COMP; 315 so->so_head = NULL; 316 317 SOCK_UNLOCK(so); 318 ACCEPT_UNLOCK(); 319 320 *sop = so; 321 322 /* connection has been removed from the listen queue */ 323 KNOTE_UNLOCKED(&head->so_rcv.sb_sel.si_note, 0); 324 done: 325 return (error); 326 } 327 328 /*ARGSUSED*/ 329 static bool_t 330 svc_vc_rendezvous_recv(SVCXPRT *xprt, struct rpc_msg *msg, 331 struct sockaddr **addrp, struct mbuf **mp) 332 { 333 struct socket *so = NULL; 334 struct sockaddr *sa = NULL; 335 int error; 336 SVCXPRT *new_xprt; 337 338 /* 339 * The socket upcall calls xprt_active() which will eventually 340 * cause the server to call us here. We attempt to accept a 341 * connection from the socket and turn it into a new 342 * transport. If the accept fails, we have drained all pending 343 * connections so we call xprt_inactive(). 344 */ 345 sx_xlock(&xprt->xp_lock); 346 347 error = svc_vc_accept(xprt->xp_socket, &so); 348 349 if (error == EWOULDBLOCK) { 350 /* 351 * We must re-test for new connections after taking 352 * the lock to protect us in the case where a new 353 * connection arrives after our call to accept fails 354 * with EWOULDBLOCK. The pool lock protects us from 355 * racing the upcall after our TAILQ_EMPTY() call 356 * returns false. 357 */ 358 ACCEPT_LOCK(); 359 mtx_lock(&xprt->xp_pool->sp_lock); 360 if (TAILQ_EMPTY(&xprt->xp_socket->so_comp)) 361 xprt_inactive_locked(xprt); 362 mtx_unlock(&xprt->xp_pool->sp_lock); 363 ACCEPT_UNLOCK(); 364 sx_xunlock(&xprt->xp_lock); 365 return (FALSE); 366 } 367 368 if (error) { 369 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv); 370 if (xprt->xp_upcallset) { 371 xprt->xp_upcallset = 0; 372 soupcall_clear(xprt->xp_socket, SO_RCV); 373 } 374 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv); 375 xprt_inactive(xprt); 376 sx_xunlock(&xprt->xp_lock); 377 return (FALSE); 378 } 379 380 sx_xunlock(&xprt->xp_lock); 381 382 sa = 0; 383 error = soaccept(so, &sa); 384 385 if (error) { 386 /* 387 * XXX not sure if I need to call sofree or soclose here. 388 */ 389 if (sa) 390 free(sa, M_SONAME); 391 return (FALSE); 392 } 393 394 /* 395 * svc_vc_create_conn will call xprt_register - we don't need 396 * to do anything with the new connection except derefence it. 397 */ 398 new_xprt = svc_vc_create_conn(xprt->xp_pool, so, sa); 399 if (!new_xprt) { 400 soclose(so); 401 } else { 402 SVC_RELEASE(new_xprt); 403 } 404 405 free(sa, M_SONAME); 406 407 return (FALSE); /* there is never an rpc msg to be processed */ 408 } 409 410 /*ARGSUSED*/ 411 static enum xprt_stat 412 svc_vc_rendezvous_stat(SVCXPRT *xprt) 413 { 414 415 return (XPRT_IDLE); 416 } 417 418 static void 419 svc_vc_destroy_common(SVCXPRT *xprt) 420 { 421 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv); 422 if (xprt->xp_upcallset) { 423 xprt->xp_upcallset = 0; 424 soupcall_clear(xprt->xp_socket, SO_RCV); 425 } 426 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv); 427 428 sx_destroy(&xprt->xp_lock); 429 if (xprt->xp_socket) 430 (void)soclose(xprt->xp_socket); 431 432 if (xprt->xp_netid) 433 (void) mem_free(xprt->xp_netid, strlen(xprt->xp_netid) + 1); 434 svc_xprt_free(xprt); 435 } 436 437 static void 438 svc_vc_rendezvous_destroy(SVCXPRT *xprt) 439 { 440 441 svc_vc_destroy_common(xprt); 442 } 443 444 static void 445 svc_vc_destroy(SVCXPRT *xprt) 446 { 447 struct cf_conn *cd = (struct cf_conn *)xprt->xp_p1; 448 449 svc_vc_destroy_common(xprt); 450 451 if (cd->mreq) 452 m_freem(cd->mreq); 453 if (cd->mpending) 454 m_freem(cd->mpending); 455 mem_free(cd, sizeof(*cd)); 456 } 457 458 /*ARGSUSED*/ 459 static bool_t 460 svc_vc_control(SVCXPRT *xprt, const u_int rq, void *in) 461 { 462 return (FALSE); 463 } 464 465 static bool_t 466 svc_vc_rendezvous_control(SVCXPRT *xprt, const u_int rq, void *in) 467 { 468 469 return (FALSE); 470 } 471 472 static enum xprt_stat 473 svc_vc_stat(SVCXPRT *xprt) 474 { 475 struct cf_conn *cd; 476 struct mbuf *m; 477 size_t n; 478 479 cd = (struct cf_conn *)(xprt->xp_p1); 480 481 if (cd->strm_stat == XPRT_DIED) 482 return (XPRT_DIED); 483 484 /* 485 * Return XPRT_MOREREQS if we have buffered data and we are 486 * mid-record or if we have enough data for a record 487 * marker. Since this is only a hint, we read mpending and 488 * resid outside the lock. We do need to take the lock if we 489 * have to traverse the mbuf chain. 490 */ 491 if (cd->mpending) { 492 if (cd->resid) 493 return (XPRT_MOREREQS); 494 n = 0; 495 sx_xlock(&xprt->xp_lock); 496 m = cd->mpending; 497 while (m && n < sizeof(uint32_t)) { 498 n += m->m_len; 499 m = m->m_next; 500 } 501 sx_xunlock(&xprt->xp_lock); 502 if (n >= sizeof(uint32_t)) 503 return (XPRT_MOREREQS); 504 } 505 506 if (soreadable(xprt->xp_socket)) 507 return (XPRT_MOREREQS); 508 509 return (XPRT_IDLE); 510 } 511 512 static bool_t 513 svc_vc_recv(SVCXPRT *xprt, struct rpc_msg *msg, 514 struct sockaddr **addrp, struct mbuf **mp) 515 { 516 struct cf_conn *cd = (struct cf_conn *) xprt->xp_p1; 517 struct uio uio; 518 struct mbuf *m; 519 XDR xdrs; 520 int error, rcvflag; 521 522 /* 523 * Serialise access to the socket and our own record parsing 524 * state. 525 */ 526 sx_xlock(&xprt->xp_lock); 527 528 for (;;) { 529 /* 530 * If we have an mbuf chain in cd->mpending, try to parse a 531 * record from it, leaving the result in cd->mreq. If we don't 532 * have a complete record, leave the partial result in 533 * cd->mreq and try to read more from the socket. 534 */ 535 if (cd->mpending) { 536 /* 537 * If cd->resid is non-zero, we have part of the 538 * record already, otherwise we are expecting a record 539 * marker. 540 */ 541 if (!cd->resid) { 542 /* 543 * See if there is enough data buffered to 544 * make up a record marker. Make sure we can 545 * handle the case where the record marker is 546 * split across more than one mbuf. 547 */ 548 size_t n = 0; 549 uint32_t header; 550 551 m = cd->mpending; 552 while (n < sizeof(uint32_t) && m) { 553 n += m->m_len; 554 m = m->m_next; 555 } 556 if (n < sizeof(uint32_t)) 557 goto readmore; 558 m_copydata(cd->mpending, 0, sizeof(header), 559 (char *)&header); 560 header = ntohl(header); 561 cd->eor = (header & 0x80000000) != 0; 562 cd->resid = header & 0x7fffffff; 563 m_adj(cd->mpending, sizeof(uint32_t)); 564 } 565 566 /* 567 * Start pulling off mbufs from cd->mpending 568 * until we either have a complete record or 569 * we run out of data. We use m_split to pull 570 * data - it will pull as much as possible and 571 * split the last mbuf if necessary. 572 */ 573 while (cd->mpending && cd->resid) { 574 m = cd->mpending; 575 if (cd->mpending->m_next 576 || cd->mpending->m_len > cd->resid) 577 cd->mpending = m_split(cd->mpending, 578 cd->resid, M_WAIT); 579 else 580 cd->mpending = NULL; 581 if (cd->mreq) 582 m_last(cd->mreq)->m_next = m; 583 else 584 cd->mreq = m; 585 while (m) { 586 cd->resid -= m->m_len; 587 m = m->m_next; 588 } 589 } 590 591 /* 592 * If cd->resid is zero now, we have managed to 593 * receive a record fragment from the stream. Check 594 * for the end-of-record mark to see if we need more. 595 */ 596 if (cd->resid == 0) { 597 if (!cd->eor) 598 continue; 599 600 /* 601 * Success - we have a complete record in 602 * cd->mreq. 603 */ 604 xdrmbuf_create(&xdrs, cd->mreq, XDR_DECODE); 605 cd->mreq = NULL; 606 sx_xunlock(&xprt->xp_lock); 607 608 if (! xdr_callmsg(&xdrs, msg)) { 609 XDR_DESTROY(&xdrs); 610 return (FALSE); 611 } 612 613 *addrp = NULL; 614 *mp = xdrmbuf_getall(&xdrs); 615 XDR_DESTROY(&xdrs); 616 617 return (TRUE); 618 } 619 } 620 621 readmore: 622 /* 623 * The socket upcall calls xprt_active() which will eventually 624 * cause the server to call us here. We attempt to 625 * read as much as possible from the socket and put 626 * the result in cd->mpending. If the read fails, 627 * we have drained both cd->mpending and the socket so 628 * we can call xprt_inactive(). 629 */ 630 uio.uio_resid = 1000000000; 631 uio.uio_td = curthread; 632 m = NULL; 633 rcvflag = MSG_DONTWAIT; 634 error = soreceive(xprt->xp_socket, NULL, &uio, &m, NULL, 635 &rcvflag); 636 637 if (error == EWOULDBLOCK) { 638 /* 639 * We must re-test for readability after 640 * taking the lock to protect us in the case 641 * where a new packet arrives on the socket 642 * after our call to soreceive fails with 643 * EWOULDBLOCK. The pool lock protects us from 644 * racing the upcall after our soreadable() 645 * call returns false. 646 */ 647 mtx_lock(&xprt->xp_pool->sp_lock); 648 if (!soreadable(xprt->xp_socket)) 649 xprt_inactive_locked(xprt); 650 mtx_unlock(&xprt->xp_pool->sp_lock); 651 sx_xunlock(&xprt->xp_lock); 652 return (FALSE); 653 } 654 655 if (error) { 656 SOCKBUF_LOCK(&xprt->xp_socket->so_rcv); 657 if (xprt->xp_upcallset) { 658 xprt->xp_upcallset = 0; 659 soupcall_clear(xprt->xp_socket, SO_RCV); 660 } 661 SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv); 662 xprt_inactive(xprt); 663 cd->strm_stat = XPRT_DIED; 664 sx_xunlock(&xprt->xp_lock); 665 return (FALSE); 666 } 667 668 if (!m) { 669 /* 670 * EOF - the other end has closed the socket. 671 */ 672 xprt_inactive(xprt); 673 cd->strm_stat = XPRT_DIED; 674 sx_xunlock(&xprt->xp_lock); 675 return (FALSE); 676 } 677 678 if (cd->mpending) 679 m_last(cd->mpending)->m_next = m; 680 else 681 cd->mpending = m; 682 } 683 } 684 685 static bool_t 686 svc_vc_reply(SVCXPRT *xprt, struct rpc_msg *msg, 687 struct sockaddr *addr, struct mbuf *m) 688 { 689 XDR xdrs; 690 struct mbuf *mrep; 691 bool_t stat = TRUE; 692 int error; 693 694 /* 695 * Leave space for record mark. 696 */ 697 MGETHDR(mrep, M_WAIT, MT_DATA); 698 mrep->m_len = 0; 699 mrep->m_data += sizeof(uint32_t); 700 701 xdrmbuf_create(&xdrs, mrep, XDR_ENCODE); 702 703 if (msg->rm_reply.rp_stat == MSG_ACCEPTED && 704 msg->rm_reply.rp_acpt.ar_stat == SUCCESS) { 705 if (!xdr_replymsg(&xdrs, msg)) 706 stat = FALSE; 707 else 708 xdrmbuf_append(&xdrs, m); 709 } else { 710 stat = xdr_replymsg(&xdrs, msg); 711 } 712 713 if (stat) { 714 m_fixhdr(mrep); 715 716 /* 717 * Prepend a record marker containing the reply length. 718 */ 719 M_PREPEND(mrep, sizeof(uint32_t), M_WAIT); 720 *mtod(mrep, uint32_t *) = 721 htonl(0x80000000 | (mrep->m_pkthdr.len 722 - sizeof(uint32_t))); 723 error = sosend(xprt->xp_socket, NULL, NULL, mrep, NULL, 724 0, curthread); 725 if (!error) { 726 stat = TRUE; 727 } 728 } else { 729 m_freem(mrep); 730 } 731 732 XDR_DESTROY(&xdrs); 733 xprt->xp_p2 = NULL; 734 735 return (stat); 736 } 737 738 static bool_t 739 svc_vc_null() 740 { 741 742 return (FALSE); 743 } 744 745 static int 746 svc_vc_soupcall(struct socket *so, void *arg, int waitflag) 747 { 748 SVCXPRT *xprt = (SVCXPRT *) arg; 749 750 xprt_active(xprt); 751 return (SU_OK); 752 } 753 754 #if 0 755 /* 756 * Get the effective UID of the sending process. Used by rpcbind, keyserv 757 * and rpc.yppasswdd on AF_LOCAL. 758 */ 759 int 760 __rpc_get_local_uid(SVCXPRT *transp, uid_t *uid) { 761 int sock, ret; 762 gid_t egid; 763 uid_t euid; 764 struct sockaddr *sa; 765 766 sock = transp->xp_fd; 767 sa = (struct sockaddr *)transp->xp_rtaddr; 768 if (sa->sa_family == AF_LOCAL) { 769 ret = getpeereid(sock, &euid, &egid); 770 if (ret == 0) 771 *uid = euid; 772 return (ret); 773 } else 774 return (-1); 775 } 776 #endif
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