1 /* $NetBSD: svc_vc.c,v 1.6 2000/07/08 11:41:50 kleink 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 35 static char *sccsid = "@(#)svc_tcp.c 1.21 87/08/11 Copyr 1984 Sun Micro"; 36 static char *sccsid = "@(#)svc_tcp.c 2.2 88/08/01 4.0 RPCSRC"; 37 #else 38 __RCSID("$NetBSD: svc_vc.c,v 1.6 2000/07/08 11:41:50 kleink 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 77 static SVCXPRT *makefd_xprt __P((int, u_int, u_int)); 78 static bool_t rendezvous_request __P((SVCXPRT *, struct rpc_msg *)); 79 static enum xprt_stat rendezvous_stat __P((SVCXPRT *)); 80 static void svc_vc_destroy __P((SVCXPRT *)); 81 static int read_vc __P((caddr_t, caddr_t, int)); 82 static int write_vc __P((caddr_t, caddr_t, int)); 83 static enum xprt_stat svc_vc_stat __P((SVCXPRT *)); 84 static bool_t svc_vc_recv __P((SVCXPRT *, struct rpc_msg *)); 85 static bool_t svc_vc_getargs __P((SVCXPRT *, xdrproc_t, caddr_t)); 86 static bool_t svc_vc_freeargs __P((SVCXPRT *, xdrproc_t, caddr_t)); 87 static bool_t svc_vc_reply __P((SVCXPRT *, struct rpc_msg *)); 88 static void svc_vc_rendezvous_ops __P((SVCXPRT *)); 89 static void svc_vc_ops __P((SVCXPRT *)); 90 static bool_t svc_vc_control __P((SVCXPRT *xprt, const u_int rq, void *in)); 91 92 struct cf_rendezvous { /* kept in xprt->xp_p1 for rendezvouser */ 93 u_int sendsize; 94 u_int recvsize; 95 }; 96 97 struct 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 */ 120 SVCXPRT * 121 svc_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); 180 cleanup_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 */ 190 SVCXPRT * 191 svc_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; 239 240 freedata: 241 if (ret->xp_ltaddr.buf != NULL) 242 mem_free(ret->xp_ltaddr.buf, rep->xp_ltaddr.maxlen); 243 244 return NULL; 245 } 246 247 static SVCXPRT * 248 makefd_xprt(fd, sendsize, recvsize) 249 int fd; 250 u_int sendsize; 251 u_int recvsize; 252 { 253 SVCXPRT *xprt; 254 struct cf_conn *cd; 255 256 _DIAGASSERT(fd != -1); 257 258 xprt = mem_alloc(sizeof(SVCXPRT)); 259 if (xprt == NULL) { 260 warnx("svc_tcp: makefd_xprt: out of memory"); 261 goto done; 262 } 263 memset(xprt, 0, sizeof *xprt); 264 cd = mem_alloc(sizeof(struct cf_conn)); 265 if (cd == NULL) { 266 warnx("svc_tcp: makefd_xprt: out of memory"); 267 mem_free(xprt, sizeof(SVCXPRT)); 268 xprt = NULL; 269 goto done; 270 } 271 cd->strm_stat = XPRT_IDLE; 272 xdrrec_create(&(cd->xdrs), sendsize, recvsize, 273 (caddr_t)(void *)xprt, read_vc, write_vc); 274 xprt->xp_p1 = (caddr_t)(void *)cd; 275 xprt->xp_verf.oa_base = cd->verf_body; 276 svc_vc_ops(xprt); /* truely deals with calls */ 277 xprt->xp_port = 0; /* this is a connection, not a rendezvouser */ 278 xprt->xp_fd = fd; 279 xprt_register(xprt); 280 done: 281 return (xprt); 282 } 283 284 /*ARGSUSED*/ 285 static bool_t 286 rendezvous_request(xprt, msg) 287 SVCXPRT *xprt; 288 struct rpc_msg *msg; 289 { 290 int sock; 291 struct cf_rendezvous *r; 292 struct sockaddr_storage addr; 293 socklen_t len; 294 struct __rpc_sockinfo si; 295 296 _DIAGASSERT(xprt != NULL); 297 _DIAGASSERT(msg != NULL); 298 299 r = (struct cf_rendezvous *)xprt->xp_p1; 300 again: 301 len = sizeof addr; 302 if ((sock = accept(xprt->xp_fd, (struct sockaddr *)(void *)&addr, 303 &len)) < 0) { 304 if (errno == EINTR) 305 goto again; 306 return (FALSE); 307 } 308 /* 309 * make a new transporter (re-uses xprt) 310 */ 311 xprt = makefd_xprt(sock, r->sendsize, r->recvsize); 312 xprt->xp_rtaddr.buf = mem_alloc(len); 313 if (xprt->xp_rtaddr.buf == NULL) 314 return (FALSE); 315 memcpy(xprt->xp_rtaddr.buf, &addr, len); 316 xprt->xp_rtaddr.len = len; 317 #ifdef PORTMAP 318 if (addr.ss_family == AF_INET) { 319 xprt->xp_raddr = *(struct sockaddr_in *)xprt->xp_rtaddr.buf; 320 xprt->xp_addrlen = sizeof (struct sockaddr_in); 321 } 322 #endif 323 if (__rpc_fd2sockinfo(sock, &si) && si.si_proto == IPPROTO_TCP) { 324 len = 1; 325 /* XXX fvdl - is this useful? */ 326 setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &len, sizeof (len)); 327 } 328 return (FALSE); /* there is never an rpc msg to be processed */ 329 } 330 331 /*ARGSUSED*/ 332 static enum xprt_stat 333 rendezvous_stat(xprt) 334 SVCXPRT *xprt; 335 { 336 337 return (XPRT_IDLE); 338 } 339 340 static void 341 svc_vc_destroy(xprt) 342 SVCXPRT *xprt; 343 { 344 struct cf_conn *cd; 345 struct cf_rendezvous *r; 346 347 _DIAGASSERT(xprt != NULL); 348 349 cd = (struct cf_conn *)xprt->xp_p1; 350 351 xprt_unregister(xprt); 352 if (xprt->xp_fd != RPC_ANYFD) 353 (void)close(xprt->xp_fd); 354 if (xprt->xp_port != 0) { 355 /* a rendezvouser socket */ 356 r = (struct cf_rendezvous *)xprt->xp_p1; 357 mem_free(r, sizeof (struct cf_rendezvous)); 358 xprt->xp_port = 0; 359 } else { 360 /* an actual connection socket */ 361 XDR_DESTROY(&(cd->xdrs)); 362 mem_free(cd, sizeof(struct cf_conn)); 363 } 364 if (xprt->xp_rtaddr.buf) 365 mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.maxlen); 366 if (xprt->xp_ltaddr.buf) 367 mem_free(xprt->xp_ltaddr.buf, xprt->xp_ltaddr.maxlen); 368 if (xprt->xp_tp) 369 free(xprt->xp_tp); 370 if (xprt->xp_netid) 371 free(xprt->xp_netid); 372 mem_free(xprt, sizeof(SVCXPRT)); 373 } 374 375 /*ARGSUSED*/ 376 static bool_t 377 svc_vc_control(xprt, rq, in) 378 SVCXPRT *xprt; 379 const u_int rq; 380 void *in; 381 { 382 return (FALSE); 383 } 384 385 /* 386 * reads data from the tcp conection. 387 * any error is fatal and the connection is closed. 388 * (And a read of zero bytes is a half closed stream => error.) 389 * All read operations timeout after 35 seconds. A timeout is 390 * fatal for the connection. 391 */ 392 static int 393 read_vc(xprtp, buf, len) 394 caddr_t xprtp; 395 caddr_t buf; 396 int len; 397 { 398 SVCXPRT *xprt; 399 int sock; 400 int milliseconds = 35 * 1000; 401 struct pollfd pollfd; 402 struct sockaddr *sa; 403 struct msghdr msg; 404 struct cmsghdr *cmp; 405 void *crmsg = NULL; 406 struct sockcred *sc; 407 socklen_t crmsgsize; 408 409 xprt = (SVCXPRT *)(void *)xprtp; 410 _DIAGASSERT(xprt != NULL); 411 412 sock = xprt->xp_fd; 413 414 sa = (struct sockaddr *)xprt->xp_rtaddr.buf; 415 if (sa->sa_family == AF_LOCAL && xprt->xp_p2 == NULL) { 416 memset(&msg, 0, sizeof msg); 417 crmsgsize = CMSG_SPACE(SOCKCREDSIZE(NGROUPS)); 418 crmsg = malloc(crmsgsize); 419 if (crmsg == NULL) 420 goto fatal_err; 421 memset(crmsg, 0, crmsgsize); 422 423 msg.msg_control = crmsg; 424 msg.msg_controllen = crmsgsize; 425 426 if (recvmsg(sock, &msg, 0) < 0) 427 goto fatal_err; 428 429 if (msg.msg_controllen == 0 || 430 (msg.msg_flags & MSG_CTRUNC) != 0) 431 goto fatal_err; 432 433 cmp = CMSG_FIRSTHDR(&msg); 434 if (cmp->cmsg_level != SOL_SOCKET || 435 cmp->cmsg_type != SCM_CREDS) 436 goto fatal_err; 437 438 sc = (struct sockcred *)(void *)CMSG_DATA(cmp); 439 440 xprt->xp_p2 = mem_alloc(SOCKCREDSIZE(sc->sc_ngroups)); 441 if (xprt->xp_p2 == NULL) 442 goto fatal_err; 443 444 memcpy(xprt->xp_p2, sc, SOCKCREDSIZE(sc->sc_ngroups)); 445 free(crmsg); 446 crmsg = NULL; 447 } 448 449 do { 450 pollfd.fd = sock; 451 pollfd.events = POLLIN; 452 switch (poll(&pollfd, 1, milliseconds)) { 453 case -1: 454 if (errno == EINTR) { 455 continue; 456 } 457 /*FALLTHROUGH*/ 458 case 0: 459 goto fatal_err; 460 461 default: 462 break; 463 } 464 } while ((pollfd.revents & POLLIN) == 0); 465 466 if ((len = read(sock, buf, (size_t)len)) > 0) 467 return (len); 468 469 fatal_err: 470 if (crmsg != NULL) 471 free(crmsg); 472 ((struct cf_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED; 473 return (-1); 474 } 475 476 /* 477 * writes data to the tcp connection. 478 * Any error is fatal and the connection is closed. 479 */ 480 static int 481 write_vc(xprtp, buf, len) 482 caddr_t xprtp; 483 caddr_t buf; 484 int len; 485 { 486 SVCXPRT *xprt; 487 int i, cnt; 488 489 xprt = (SVCXPRT *)(void *)xprtp; 490 _DIAGASSERT(xprt != NULL); 491 492 for (cnt = len; cnt > 0; cnt -= i, buf += i) { 493 if ((i = write(xprt->xp_fd, buf, (size_t)cnt)) < 0) { 494 ((struct cf_conn *)(xprt->xp_p1))->strm_stat = 495 XPRT_DIED; 496 return (-1); 497 } 498 } 499 return (len); 500 } 501 502 static enum xprt_stat 503 svc_vc_stat(xprt) 504 SVCXPRT *xprt; 505 { 506 struct cf_conn *cd; 507 508 _DIAGASSERT(xprt != NULL); 509 510 cd = (struct cf_conn *)(xprt->xp_p1); 511 512 if (cd->strm_stat == XPRT_DIED) 513 return (XPRT_DIED); 514 if (! xdrrec_eof(&(cd->xdrs))) 515 return (XPRT_MOREREQS); 516 return (XPRT_IDLE); 517 } 518 519 static bool_t 520 svc_vc_recv(xprt, msg) 521 SVCXPRT *xprt; 522 struct rpc_msg *msg; 523 { 524 struct cf_conn *cd; 525 XDR *xdrs; 526 527 _DIAGASSERT(xprt != NULL); 528 _DIAGASSERT(msg != NULL); 529 530 cd = (struct cf_conn *)(xprt->xp_p1); 531 xdrs = &(cd->xdrs); 532 533 xdrs->x_op = XDR_DECODE; 534 (void)xdrrec_skiprecord(xdrs); 535 if (xdr_callmsg(xdrs, msg)) { 536 cd->x_id = msg->rm_xid; 537 return (TRUE); 538 } 539 cd->strm_stat = XPRT_DIED; 540 return (FALSE); 541 } 542 543 static bool_t 544 svc_vc_getargs(xprt, xdr_args, args_ptr) 545 SVCXPRT *xprt; 546 xdrproc_t xdr_args; 547 caddr_t args_ptr; 548 { 549 550 _DIAGASSERT(xprt != NULL); 551 /* args_ptr may be NULL */ 552 553 return ((*xdr_args)(&(((struct cf_conn *)(xprt->xp_p1))->xdrs), 554 args_ptr)); 555 } 556 557 static bool_t 558 svc_vc_freeargs(xprt, xdr_args, args_ptr) 559 SVCXPRT *xprt; 560 xdrproc_t xdr_args; 561 caddr_t args_ptr; 562 { 563 XDR *xdrs; 564 565 _DIAGASSERT(xprt != NULL); 566 /* args_ptr may be NULL */ 567 568 xdrs = &(((struct cf_conn *)(xprt->xp_p1))->xdrs); 569 570 xdrs->x_op = XDR_FREE; 571 return ((*xdr_args)(xdrs, args_ptr)); 572 } 573 574 static bool_t 575 svc_vc_reply(xprt, msg) 576 SVCXPRT *xprt; 577 struct rpc_msg *msg; 578 { 579 struct cf_conn *cd; 580 XDR *xdrs; 581 bool_t stat; 582 583 _DIAGASSERT(xprt != NULL); 584 _DIAGASSERT(msg != NULL); 585 586 cd = (struct cf_conn *)(xprt->xp_p1); 587 xdrs = &(cd->xdrs); 588 589 xdrs->x_op = XDR_ENCODE; 590 msg->rm_xid = cd->x_id; 591 stat = xdr_replymsg(xdrs, msg); 592 (void)xdrrec_endofrecord(xdrs, TRUE); 593 return (stat); 594 } 595 596 static void 597 svc_vc_ops(xprt) 598 SVCXPRT *xprt; 599 { 600 static struct xp_ops ops; 601 static struct xp_ops2 ops2; 602 #ifdef __REENT 603 extern mutex_t ops_lock; 604 #endif 605 606 /* VARIABLES PROTECTED BY ops_lock: ops, ops2 */ 607 608 mutex_lock(&ops_lock); 609 if (ops.xp_recv == NULL) { 610 ops.xp_recv = svc_vc_recv; 611 ops.xp_stat = svc_vc_stat; 612 ops.xp_getargs = svc_vc_getargs; 613 ops.xp_reply = svc_vc_reply; 614 ops.xp_freeargs = svc_vc_freeargs; 615 ops.xp_destroy = svc_vc_destroy; 616 ops2.xp_control = svc_vc_control; 617 } 618 xprt->xp_ops = &ops; 619 xprt->xp_ops2 = &ops2; 620 mutex_unlock(&ops_lock); 621 } 622 623 static void 624 svc_vc_rendezvous_ops(xprt) 625 SVCXPRT *xprt; 626 { 627 static struct xp_ops ops; 628 static struct xp_ops2 ops2; 629 #ifdef __REENT 630 extern mutex_t ops_lock; 631 #endif 632 633 mutex_lock(&ops_lock); 634 if (ops.xp_recv == NULL) { 635 ops.xp_recv = rendezvous_request; 636 ops.xp_stat = rendezvous_stat; 637 ops.xp_getargs = 638 (bool_t (*) __P((SVCXPRT *, xdrproc_t, caddr_t)))abort; 639 ops.xp_reply = 640 (bool_t (*) __P((SVCXPRT *, struct rpc_msg *)))abort; 641 ops.xp_freeargs = 642 (bool_t (*) __P((SVCXPRT *, xdrproc_t, caddr_t)))abort, 643 ops.xp_destroy = svc_vc_destroy; 644 ops2.xp_control = svc_vc_control; 645 } 646 xprt->xp_ops = &ops; 647 xprt->xp_ops2 = &ops2; 648 mutex_unlock(&ops_lock); 649 } 650