svc_vc.c revision 1.9
1/* $NetBSD: svc_vc.c,v 1.9 2002/03/03 18:19:41 cjep 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#include <sys/cdefs.h> 33#if defined(LIBC_SCCS) && !defined(lint) 34#if 0 35static char *sccsid = "@(#)svc_tcp.c 1.21 87/08/11 Copyr 1984 Sun Micro"; 36static char *sccsid = "@(#)svc_tcp.c 2.2 88/08/01 4.0 RPCSRC"; 37#else 38__RCSID("$NetBSD: svc_vc.c,v 1.9 2002/03/03 18:19:41 cjep Exp $"); 39#endif 40#endif 41 42/* 43 * svc_vc.c, Server side for Connection Oriented based RPC. 44 * 45 * Actually implements two flavors of transporter - 46 * a tcp rendezvouser (a listner and connection establisher) 47 * and a record/tcp stream. 48 */ 49 50#include "namespace.h" 51#include "reentrant.h" 52#include <sys/types.h> 53#include <sys/param.h> 54#include <sys/poll.h> 55#include <sys/socket.h> 56#include <sys/un.h> 57#include <netinet/in.h> 58#include <netinet/tcp.h> 59 60#include <assert.h> 61#include <err.h> 62#include <errno.h> 63#include <stdio.h> 64#include <stdlib.h> 65#include <string.h> 66#include <unistd.h> 67 68#include <rpc/rpc.h> 69 70#include "rpc_com.h" 71 72#ifdef __weak_alias 73__weak_alias(svc_fd_create,_svc_fd_create) 74__weak_alias(svc_vc_create,_svc_vc_create) 75#endif 76 77static SVCXPRT *makefd_xprt __P((int, u_int, u_int)); 78static bool_t rendezvous_request __P((SVCXPRT *, struct rpc_msg *)); 79static enum xprt_stat rendezvous_stat __P((SVCXPRT *)); 80static void svc_vc_destroy __P((SVCXPRT *)); 81static int read_vc __P((caddr_t, caddr_t, int)); 82static int write_vc __P((caddr_t, caddr_t, int)); 83static enum xprt_stat svc_vc_stat __P((SVCXPRT *)); 84static bool_t svc_vc_recv __P((SVCXPRT *, struct rpc_msg *)); 85static bool_t svc_vc_getargs __P((SVCXPRT *, xdrproc_t, caddr_t)); 86static bool_t svc_vc_freeargs __P((SVCXPRT *, xdrproc_t, caddr_t)); 87static bool_t svc_vc_reply __P((SVCXPRT *, struct rpc_msg *)); 88static void svc_vc_rendezvous_ops __P((SVCXPRT *)); 89static void svc_vc_ops __P((SVCXPRT *)); 90static bool_t svc_vc_control __P((SVCXPRT *xprt, const u_int rq, void *in)); 91 92struct cf_rendezvous { /* kept in xprt->xp_p1 for rendezvouser */ 93 u_int sendsize; 94 u_int recvsize; 95}; 96 97struct cf_conn { /* kept in xprt->xp_p1 for actual connection */ 98 enum xprt_stat strm_stat; 99 u_int32_t x_id; 100 XDR xdrs; 101 char verf_body[MAX_AUTH_BYTES]; 102}; 103 104/* 105 * Usage: 106 * xprt = svc_vc_create(sock, send_buf_size, recv_buf_size); 107 * 108 * Creates, registers, and returns a (rpc) tcp based transporter. 109 * Once *xprt is initialized, it is registered as a transporter 110 * see (svc.h, xprt_register). This routine returns 111 * a NULL if a problem occurred. 112 * 113 * The filedescriptor passed in is expected to refer to a bound, but 114 * not yet connected socket. 115 * 116 * Since streams do buffered io similar to stdio, the caller can specify 117 * how big the send and receive buffers are via the second and third parms; 118 * 0 => use the system default. 119 */ 120SVCXPRT * 121svc_vc_create(fd, sendsize, recvsize) 122 int fd; 123 u_int sendsize; 124 u_int recvsize; 125{ 126 SVCXPRT *xprt; 127 struct cf_rendezvous *r = NULL; 128 struct __rpc_sockinfo si; 129 struct sockaddr_storage sslocal; 130 socklen_t slen; 131 int one = 1; 132 133 r = mem_alloc(sizeof(*r)); 134 if (r == NULL) { 135 warnx("svc_vc_create: out of memory"); 136 goto cleanup_svc_vc_create; 137 } 138 if (!__rpc_fd2sockinfo(fd, &si)) 139 return NULL; 140 r->sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize); 141 r->recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize); 142 xprt = mem_alloc(sizeof(SVCXPRT)); 143 if (xprt == NULL) { 144 warnx("svc_vc_create: out of memory"); 145 goto cleanup_svc_vc_create; 146 } 147 xprt->xp_tp = NULL; 148 xprt->xp_p1 = (caddr_t)(void *)r; 149 xprt->xp_p2 = NULL; 150 xprt->xp_p3 = NULL; 151 xprt->xp_verf = _null_auth; 152 svc_vc_rendezvous_ops(xprt); 153 xprt->xp_port = (u_short)-1; /* It is the rendezvouser */ 154 xprt->xp_fd = fd; 155 156 slen = sizeof (struct sockaddr_storage); 157 if (getsockname(fd, (struct sockaddr *)(void *)&sslocal, &slen) < 0) { 158 warnx("svc_vc_create: could not retrieve local addr"); 159 goto cleanup_svc_vc_create; 160 } 161 162 /* 163 * We want to be able to check credentials on local sockets. 164 */ 165 if (sslocal.ss_family == AF_LOCAL) 166 if (setsockopt(fd, 0, LOCAL_CREDS, &one, sizeof one) < 0) 167 goto cleanup_svc_vc_create; 168 169 xprt->xp_ltaddr.maxlen = xprt->xp_ltaddr.len = sslocal.ss_len; 170 xprt->xp_ltaddr.buf = mem_alloc((size_t)sslocal.ss_len); 171 if (xprt->xp_ltaddr.buf == NULL) { 172 warnx("svc_vc_create: no mem for local addr"); 173 goto cleanup_svc_vc_create; 174 } 175 memcpy(xprt->xp_ltaddr.buf, &sslocal, (size_t)sslocal.ss_len); 176 177 xprt->xp_rtaddr.maxlen = sizeof (struct sockaddr_storage); 178 xprt_register(xprt); 179 return (xprt); 180cleanup_svc_vc_create: 181 if (r != NULL) 182 mem_free(r, sizeof(*r)); 183 return (NULL); 184} 185 186/* 187 * Like svtcp_create(), except the routine takes any *open* UNIX file 188 * descriptor as its first input. 189 */ 190SVCXPRT * 191svc_fd_create(fd, sendsize, recvsize) 192 int fd; 193 u_int sendsize; 194 u_int recvsize; 195{ 196 struct sockaddr_storage ss; 197 socklen_t slen; 198 SVCXPRT *ret; 199 200 _DIAGASSERT(fd != -1); 201 202 ret = makefd_xprt(fd, sendsize, recvsize); 203 if (ret == NULL) 204 return NULL; 205 206 slen = sizeof (struct sockaddr_storage); 207 if (getsockname(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) { 208 warnx("svc_fd_create: could not retrieve local addr"); 209 goto freedata; 210 } 211 ret->xp_ltaddr.maxlen = ret->xp_ltaddr.len = ss.ss_len; 212 ret->xp_ltaddr.buf = mem_alloc((size_t)ss.ss_len); 213 if (ret->xp_ltaddr.buf == NULL) { 214 warnx("svc_fd_create: no mem for local addr"); 215 goto freedata; 216 } 217 memcpy(ret->xp_ltaddr.buf, &ss, (size_t)ss.ss_len); 218 219 slen = sizeof (struct sockaddr_storage); 220 if (getpeername(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) { 221 warnx("svc_fd_create: could not retrieve remote addr"); 222 goto freedata; 223 } 224 ret->xp_rtaddr.maxlen = ret->xp_rtaddr.len = ss.ss_len; 225 ret->xp_rtaddr.buf = mem_alloc((size_t)ss.ss_len); 226 if (ret->xp_rtaddr.buf == NULL) { 227 warnx("svc_fd_create: no mem for local addr"); 228 goto freedata; 229 } 230 memcpy(ret->xp_rtaddr.buf, &ss, (size_t)ss.ss_len); 231#ifdef PORTMAP 232 if (ss.ss_family == AF_INET) { 233 ret->xp_raddr = *(struct sockaddr_in *)ret->xp_rtaddr.buf; 234 ret->xp_addrlen = sizeof (struct sockaddr_in); 235 } 236#endif 237 238 return ret; 239 240freedata: 241 if (ret->xp_ltaddr.buf != NULL) 242 mem_free(ret->xp_ltaddr.buf, rep->xp_ltaddr.maxlen); 243 244 return NULL; 245} 246 247static SVCXPRT * 248makefd_xprt(fd, sendsize, recvsize) 249 int fd; 250 u_int sendsize; 251 u_int recvsize; 252{ 253 SVCXPRT *xprt; 254 struct cf_conn *cd; 255 const char *netid; 256 struct __rpc_sockinfo si; 257 258 _DIAGASSERT(fd != -1); 259 260 xprt = mem_alloc(sizeof(SVCXPRT)); 261 if (xprt == NULL) { 262 warnx("svc_vc: makefd_xprt: out of memory"); 263 goto done; 264 } 265 memset(xprt, 0, sizeof *xprt); 266 cd = mem_alloc(sizeof(struct cf_conn)); 267 if (cd == NULL) { 268 warnx("svc_tcp: makefd_xprt: out of memory"); 269 mem_free(xprt, sizeof(SVCXPRT)); 270 xprt = NULL; 271 goto done; 272 } 273 cd->strm_stat = XPRT_IDLE; 274 xdrrec_create(&(cd->xdrs), sendsize, recvsize, 275 (caddr_t)(void *)xprt, read_vc, write_vc); 276 xprt->xp_p1 = (caddr_t)(void *)cd; 277 xprt->xp_verf.oa_base = cd->verf_body; 278 svc_vc_ops(xprt); /* truely deals with calls */ 279 xprt->xp_port = 0; /* this is a connection, not a rendezvouser */ 280 xprt->xp_fd = fd; 281 if (__rpc_fd2sockinfo(fd, &si) && __rpc_sockinfo2netid(&si, &netid)) 282 xprt->xp_netid = strdup(netid); 283 284 xprt_register(xprt); 285done: 286 return (xprt); 287} 288 289/*ARGSUSED*/ 290static bool_t 291rendezvous_request(xprt, msg) 292 SVCXPRT *xprt; 293 struct rpc_msg *msg; 294{ 295 int sock; 296 struct cf_rendezvous *r; 297 struct sockaddr_storage addr; 298 socklen_t len; 299 struct __rpc_sockinfo si; 300 301 _DIAGASSERT(xprt != NULL); 302 _DIAGASSERT(msg != NULL); 303 304 r = (struct cf_rendezvous *)xprt->xp_p1; 305again: 306 len = sizeof addr; 307 if ((sock = accept(xprt->xp_fd, (struct sockaddr *)(void *)&addr, 308 &len)) < 0) { 309 if (errno == EINTR) 310 goto again; 311 return (FALSE); 312 } 313 /* 314 * make a new transporter (re-uses xprt) 315 */ 316 xprt = makefd_xprt(sock, r->sendsize, r->recvsize); 317 xprt->xp_rtaddr.buf = mem_alloc(len); 318 if (xprt->xp_rtaddr.buf == NULL) 319 return (FALSE); 320 memcpy(xprt->xp_rtaddr.buf, &addr, len); 321 xprt->xp_rtaddr.len = len; 322#ifdef PORTMAP 323 if (addr.ss_family == AF_INET) { 324 xprt->xp_raddr = *(struct sockaddr_in *)xprt->xp_rtaddr.buf; 325 xprt->xp_addrlen = sizeof (struct sockaddr_in); 326 } 327#endif 328 if (__rpc_fd2sockinfo(sock, &si) && si.si_proto == IPPROTO_TCP) { 329 len = 1; 330 /* XXX fvdl - is this useful? */ 331 setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &len, sizeof (len)); 332 } 333 return (FALSE); /* there is never an rpc msg to be processed */ 334} 335 336/*ARGSUSED*/ 337static enum xprt_stat 338rendezvous_stat(xprt) 339 SVCXPRT *xprt; 340{ 341 342 return (XPRT_IDLE); 343} 344 345static void 346svc_vc_destroy(xprt) 347 SVCXPRT *xprt; 348{ 349 struct cf_conn *cd; 350 struct cf_rendezvous *r; 351 352 _DIAGASSERT(xprt != NULL); 353 354 cd = (struct cf_conn *)xprt->xp_p1; 355 356 xprt_unregister(xprt); 357 if (xprt->xp_fd != RPC_ANYFD) 358 (void)close(xprt->xp_fd); 359 if (xprt->xp_port != 0) { 360 /* a rendezvouser socket */ 361 r = (struct cf_rendezvous *)xprt->xp_p1; 362 mem_free(r, sizeof (struct cf_rendezvous)); 363 xprt->xp_port = 0; 364 } else { 365 /* an actual connection socket */ 366 XDR_DESTROY(&(cd->xdrs)); 367 mem_free(cd, sizeof(struct cf_conn)); 368 } 369 if (xprt->xp_rtaddr.buf) 370 mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.maxlen); 371 if (xprt->xp_ltaddr.buf) 372 mem_free(xprt->xp_ltaddr.buf, xprt->xp_ltaddr.maxlen); 373 if (xprt->xp_tp) 374 free(xprt->xp_tp); 375 if (xprt->xp_netid) 376 free(xprt->xp_netid); 377 mem_free(xprt, sizeof(SVCXPRT)); 378} 379 380/*ARGSUSED*/ 381static bool_t 382svc_vc_control(xprt, rq, in) 383 SVCXPRT *xprt; 384 const u_int rq; 385 void *in; 386{ 387 return (FALSE); 388} 389 390/* 391 * reads data from the tcp connection. 392 * any error is fatal and the connection is closed. 393 * (And a read of zero bytes is a half closed stream => error.) 394 * All read operations timeout after 35 seconds. A timeout is 395 * fatal for the connection. 396 */ 397static int 398read_vc(xprtp, buf, len) 399 caddr_t xprtp; 400 caddr_t buf; 401 int len; 402{ 403 SVCXPRT *xprt; 404 int sock; 405 int milliseconds = 35 * 1000; 406 struct pollfd pollfd; 407 struct sockaddr *sa; 408 struct msghdr msg; 409 struct cmsghdr *cmp; 410 void *crmsg = NULL; 411 struct sockcred *sc; 412 socklen_t crmsgsize; 413 414 xprt = (SVCXPRT *)(void *)xprtp; 415 _DIAGASSERT(xprt != NULL); 416 417 sock = xprt->xp_fd; 418 419 sa = (struct sockaddr *)xprt->xp_rtaddr.buf; 420 if (sa->sa_family == AF_LOCAL && xprt->xp_p2 == NULL) { 421 memset(&msg, 0, sizeof msg); 422 crmsgsize = CMSG_SPACE(SOCKCREDSIZE(NGROUPS)); 423 crmsg = malloc(crmsgsize); 424 if (crmsg == NULL) 425 goto fatal_err; 426 memset(crmsg, 0, crmsgsize); 427 428 msg.msg_control = crmsg; 429 msg.msg_controllen = crmsgsize; 430 431 if (recvmsg(sock, &msg, 0) < 0) 432 goto fatal_err; 433 434 if (msg.msg_controllen == 0 || 435 (msg.msg_flags & MSG_CTRUNC) != 0) 436 goto fatal_err; 437 438 cmp = CMSG_FIRSTHDR(&msg); 439 if (cmp->cmsg_level != SOL_SOCKET || 440 cmp->cmsg_type != SCM_CREDS) 441 goto fatal_err; 442 443 sc = (struct sockcred *)(void *)CMSG_DATA(cmp); 444 445 xprt->xp_p2 = mem_alloc(SOCKCREDSIZE(sc->sc_ngroups)); 446 if (xprt->xp_p2 == NULL) 447 goto fatal_err; 448 449 memcpy(xprt->xp_p2, sc, SOCKCREDSIZE(sc->sc_ngroups)); 450 free(crmsg); 451 crmsg = NULL; 452 } 453 454 do { 455 pollfd.fd = sock; 456 pollfd.events = POLLIN; 457 switch (poll(&pollfd, 1, milliseconds)) { 458 case -1: 459 if (errno == EINTR) { 460 continue; 461 } 462 /*FALLTHROUGH*/ 463 case 0: 464 goto fatal_err; 465 466 default: 467 break; 468 } 469 } while ((pollfd.revents & POLLIN) == 0); 470 471 if ((len = read(sock, buf, (size_t)len)) > 0) 472 return (len); 473 474fatal_err: 475 if (crmsg != NULL) 476 free(crmsg); 477 ((struct cf_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED; 478 return (-1); 479} 480 481/* 482 * writes data to the tcp connection. 483 * Any error is fatal and the connection is closed. 484 */ 485static int 486write_vc(xprtp, buf, len) 487 caddr_t xprtp; 488 caddr_t buf; 489 int len; 490{ 491 SVCXPRT *xprt; 492 int i, cnt; 493 494 xprt = (SVCXPRT *)(void *)xprtp; 495 _DIAGASSERT(xprt != NULL); 496 497 for (cnt = len; cnt > 0; cnt -= i, buf += i) { 498 if ((i = write(xprt->xp_fd, buf, (size_t)cnt)) < 0) { 499 ((struct cf_conn *)(xprt->xp_p1))->strm_stat = 500 XPRT_DIED; 501 return (-1); 502 } 503 } 504 return (len); 505} 506 507static enum xprt_stat 508svc_vc_stat(xprt) 509 SVCXPRT *xprt; 510{ 511 struct cf_conn *cd; 512 513 _DIAGASSERT(xprt != NULL); 514 515 cd = (struct cf_conn *)(xprt->xp_p1); 516 517 if (cd->strm_stat == XPRT_DIED) 518 return (XPRT_DIED); 519 if (! xdrrec_eof(&(cd->xdrs))) 520 return (XPRT_MOREREQS); 521 return (XPRT_IDLE); 522} 523 524static bool_t 525svc_vc_recv(xprt, msg) 526 SVCXPRT *xprt; 527 struct rpc_msg *msg; 528{ 529 struct cf_conn *cd; 530 XDR *xdrs; 531 532 _DIAGASSERT(xprt != NULL); 533 _DIAGASSERT(msg != NULL); 534 535 cd = (struct cf_conn *)(xprt->xp_p1); 536 xdrs = &(cd->xdrs); 537 538 xdrs->x_op = XDR_DECODE; 539 (void)xdrrec_skiprecord(xdrs); 540 if (xdr_callmsg(xdrs, msg)) { 541 cd->x_id = msg->rm_xid; 542 return (TRUE); 543 } 544 cd->strm_stat = XPRT_DIED; 545 return (FALSE); 546} 547 548static bool_t 549svc_vc_getargs(xprt, xdr_args, args_ptr) 550 SVCXPRT *xprt; 551 xdrproc_t xdr_args; 552 caddr_t args_ptr; 553{ 554 555 _DIAGASSERT(xprt != NULL); 556 /* args_ptr may be NULL */ 557 558 return ((*xdr_args)(&(((struct cf_conn *)(xprt->xp_p1))->xdrs), 559 args_ptr)); 560} 561 562static bool_t 563svc_vc_freeargs(xprt, xdr_args, args_ptr) 564 SVCXPRT *xprt; 565 xdrproc_t xdr_args; 566 caddr_t args_ptr; 567{ 568 XDR *xdrs; 569 570 _DIAGASSERT(xprt != NULL); 571 /* args_ptr may be NULL */ 572 573 xdrs = &(((struct cf_conn *)(xprt->xp_p1))->xdrs); 574 575 xdrs->x_op = XDR_FREE; 576 return ((*xdr_args)(xdrs, args_ptr)); 577} 578 579static bool_t 580svc_vc_reply(xprt, msg) 581 SVCXPRT *xprt; 582 struct rpc_msg *msg; 583{ 584 struct cf_conn *cd; 585 XDR *xdrs; 586 bool_t stat; 587 588 _DIAGASSERT(xprt != NULL); 589 _DIAGASSERT(msg != NULL); 590 591 cd = (struct cf_conn *)(xprt->xp_p1); 592 xdrs = &(cd->xdrs); 593 594 xdrs->x_op = XDR_ENCODE; 595 msg->rm_xid = cd->x_id; 596 stat = xdr_replymsg(xdrs, msg); 597 (void)xdrrec_endofrecord(xdrs, TRUE); 598 return (stat); 599} 600 601static void 602svc_vc_ops(xprt) 603 SVCXPRT *xprt; 604{ 605 static struct xp_ops ops; 606 static struct xp_ops2 ops2; 607#ifdef __REENT 608 extern mutex_t ops_lock; 609#endif 610 611/* VARIABLES PROTECTED BY ops_lock: ops, ops2 */ 612 613 mutex_lock(&ops_lock); 614 if (ops.xp_recv == NULL) { 615 ops.xp_recv = svc_vc_recv; 616 ops.xp_stat = svc_vc_stat; 617 ops.xp_getargs = svc_vc_getargs; 618 ops.xp_reply = svc_vc_reply; 619 ops.xp_freeargs = svc_vc_freeargs; 620 ops.xp_destroy = svc_vc_destroy; 621 ops2.xp_control = svc_vc_control; 622 } 623 xprt->xp_ops = &ops; 624 xprt->xp_ops2 = &ops2; 625 mutex_unlock(&ops_lock); 626} 627 628static void 629svc_vc_rendezvous_ops(xprt) 630 SVCXPRT *xprt; 631{ 632 static struct xp_ops ops; 633 static struct xp_ops2 ops2; 634#ifdef __REENT 635 extern mutex_t ops_lock; 636#endif 637 638 mutex_lock(&ops_lock); 639 if (ops.xp_recv == NULL) { 640 ops.xp_recv = rendezvous_request; 641 ops.xp_stat = rendezvous_stat; 642 ops.xp_getargs = 643 (bool_t (*) __P((SVCXPRT *, xdrproc_t, caddr_t)))abort; 644 ops.xp_reply = 645 (bool_t (*) __P((SVCXPRT *, struct rpc_msg *)))abort; 646 ops.xp_freeargs = 647 (bool_t (*) __P((SVCXPRT *, xdrproc_t, caddr_t)))abort, 648 ops.xp_destroy = svc_vc_destroy; 649 ops2.xp_control = svc_vc_control; 650 } 651 xprt->xp_ops = &ops; 652 xprt->xp_ops2 = &ops2; 653 mutex_unlock(&ops_lock); 654} 655