svc_vc.c revision 1.2
1 /* $NetBSD: svc_vc.c,v 1.2 2000/06/03 20:26:05 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 #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 1.2 2000/06/03 20:26:05 fvdl 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 struct credmsg { 105 struct cmsghdr cm; 106 char creds[SOCKCREDSIZE(NGROUPS)]; 107 }; 108 109 /* 110 * Usage: 111 * xprt = svc_vc_create(sock, send_buf_size, recv_buf_size); 112 * 113 * Creates, registers, and returns a (rpc) tcp based transporter. 114 * Once *xprt is initialized, it is registered as a transporter 115 * see (svc.h, xprt_register). This routine returns 116 * a NULL if a problem occurred. 117 * 118 * The filedescriptor passed in is expected to refer to a bound, but 119 * not yet connected socket. 120 * 121 * Since streams do buffered io similar to stdio, the caller can specify 122 * how big the send and receive buffers are via the second and third parms; 123 * 0 => use the system default. 124 */ 125 SVCXPRT * 126 svc_vc_create(fd, sendsize, recvsize) 127 int fd; 128 u_int sendsize; 129 u_int recvsize; 130 { 131 SVCXPRT *xprt; 132 struct cf_rendezvous *r = NULL; 133 struct __rpc_sockinfo si; 134 struct sockaddr_storage sslocal; 135 socklen_t slen; 136 int one; 137 138 r = (struct cf_rendezvous *)mem_alloc(sizeof(*r)); 139 if (r == NULL) { 140 warnx("svc_vc_create: out of memory"); 141 goto cleanup_svc_vc_create; 142 } 143 if (!__rpc_fd2sockinfo(fd, &si)) 144 return NULL; 145 r->sendsize = __rpc_get_t_size(si.si_af, si.si_proto, sendsize); 146 r->recvsize = __rpc_get_t_size(si.si_af, si.si_proto, recvsize); 147 xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT)); 148 if (xprt == NULL) { 149 warnx("svc_vc_create: out of memory"); 150 goto cleanup_svc_vc_create; 151 } 152 xprt->xp_tp = NULL; 153 xprt->xp_p1 = (caddr_t)(void *)r; 154 xprt->xp_p2 = NULL; 155 xprt->xp_p3 = NULL; 156 xprt->xp_verf = _null_auth; 157 svc_vc_rendezvous_ops(xprt); 158 xprt->xp_port = -1; /* It is the rendezvouser */ 159 xprt->xp_fd = fd; 160 161 slen = sizeof (struct sockaddr_storage); 162 if (getsockname(fd, (struct sockaddr *)&sslocal, &slen) < 0) { 163 warnx("svc_vc_create: could not retrieve local addr"); 164 goto cleanup_svc_vc_create; 165 } 166 167 /* 168 * We want to be able to check credentials on local sockets. 169 */ 170 if (sslocal.ss_family == AF_LOCAL) 171 if (setsockopt(fd, 0, LOCAL_CREDS, &one, sizeof one) < 0) 172 goto cleanup_svc_vc_create; 173 174 xprt->xp_ltaddr.maxlen = xprt->xp_ltaddr.len = sslocal.ss_len; 175 xprt->xp_ltaddr.buf = mem_alloc(sslocal.ss_len); 176 if (xprt->xp_ltaddr.buf == NULL) { 177 warnx("svc_vc_create: no mem for local addr"); 178 goto cleanup_svc_vc_create; 179 } 180 memcpy(xprt->xp_ltaddr.buf, &sslocal, sslocal.ss_len); 181 182 xprt->xp_rtaddr.maxlen = sizeof (struct sockaddr_storage); 183 xprt_register(xprt); 184 return (xprt); 185 cleanup_svc_vc_create: 186 if (r != NULL) 187 mem_free(r, sizeof(*r)); 188 return ((SVCXPRT *)NULL); 189 } 190 191 /* 192 * Like svtcp_create(), except the routine takes any *open* UNIX file 193 * descriptor as its first input. 194 */ 195 SVCXPRT * 196 svc_fd_create(fd, sendsize, recvsize) 197 int fd; 198 u_int sendsize; 199 u_int recvsize; 200 { 201 struct sockaddr_storage ss; 202 socklen_t slen; 203 SVCXPRT *ret; 204 205 _DIAGASSERT(fd != -1); 206 207 ret = makefd_xprt(fd, sendsize, recvsize); 208 if (ret == NULL) 209 return NULL; 210 211 slen = sizeof (struct sockaddr_storage); 212 if (getsockname(fd, (struct sockaddr *)&ss, &slen) < 0) { 213 warnx("svc_dg_create: could not retrieve local addr"); 214 goto freedata; 215 } 216 ret->xp_ltaddr.maxlen = ret->xp_ltaddr.len = ss.ss_len; 217 ret->xp_ltaddr.buf = mem_alloc(ss.ss_len); 218 if (ret->xp_ltaddr.buf == NULL) { 219 warnx("svc_fd_create: no mem for local addr"); 220 goto freedata; 221 } 222 memcpy(ret->xp_ltaddr.buf, &ss, ss.ss_len); 223 224 slen = sizeof (struct sockaddr_storage); 225 if (getpeername(fd, (struct sockaddr *)&ss, &slen) < 0) { 226 warnx("svc_dg_create: could not retrieve remote addr"); 227 goto freedata; 228 } 229 ret->xp_rtaddr.maxlen = ret->xp_rtaddr.len = ss.ss_len; 230 ret->xp_rtaddr.buf = mem_alloc(ss.ss_len); 231 if (ret->xp_rtaddr.buf == NULL) { 232 warnx("svc_fd_create: no mem for local addr"); 233 goto freedata; 234 } 235 memcpy(ret->xp_rtaddr.buf, &ss, ss.ss_len); 236 #ifdef PORTMAP 237 if (ss.ss_family == AF_INET) { 238 ret->xp_raddr = *(struct sockaddr_in *)ret->xp_rtaddr.buf; 239 ret->xp_addrlen = sizeof (struct sockaddr_in); 240 } 241 #endif 242 243 return ret; 244 245 freedata: 246 if (ret->xp_ltaddr.buf != NULL) 247 mem_free(ret->xp_ltaddr.buf, rep->xp_ltaddr.maxlen); 248 249 return NULL; 250 } 251 252 static SVCXPRT * 253 makefd_xprt(fd, sendsize, recvsize) 254 int fd; 255 u_int sendsize; 256 u_int recvsize; 257 { 258 SVCXPRT *xprt; 259 struct cf_conn *cd; 260 261 _DIAGASSERT(fd != -1); 262 263 xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT)); 264 if (xprt == (SVCXPRT *)NULL) { 265 warnx("svc_tcp: makefd_xprt: out of memory"); 266 goto done; 267 } 268 memset(xprt, 0, sizeof *xprt); 269 cd = (struct cf_conn *)mem_alloc(sizeof(struct cf_conn)); 270 if (cd == (struct cf_conn *)NULL) { 271 warnx("svc_tcp: makefd_xprt: out of memory"); 272 mem_free(xprt, sizeof(SVCXPRT)); 273 xprt = (SVCXPRT *)NULL; 274 goto done; 275 } 276 cd->strm_stat = XPRT_IDLE; 277 xdrrec_create(&(cd->xdrs), sendsize, recvsize, 278 (caddr_t)(void *)xprt, read_vc, write_vc); 279 xprt->xp_p1 = (caddr_t)(void *)cd; 280 xprt->xp_verf.oa_base = cd->verf_body; 281 svc_vc_ops(xprt); /* truely deals with calls */ 282 xprt->xp_port = 0; /* this is a connection, not a rendezvouser */ 283 xprt->xp_fd = fd; 284 xprt_register(xprt); 285 done: 286 return (xprt); 287 } 288 289 /*ARGSUSED*/ 290 static bool_t 291 rendezvous_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; 305 again: 306 len = sizeof addr; 307 if ((sock = accept(xprt->xp_fd, (struct sockaddr *)&addr, &len)) < 0) { 308 if (errno == EINTR) 309 goto again; 310 return (FALSE); 311 } 312 /* 313 * make a new transporter (re-uses xprt) 314 */ 315 xprt = makefd_xprt(sock, r->sendsize, r->recvsize); 316 xprt->xp_rtaddr.buf = mem_alloc(len); 317 if (xprt->xp_rtaddr.buf == NULL) 318 return (FALSE); 319 memcpy(xprt->xp_rtaddr.buf, &addr, len); 320 xprt->xp_rtaddr.len = len; 321 #ifdef PORTMAP 322 if (addr.ss_family == AF_INET) { 323 xprt->xp_raddr = *(struct sockaddr_in *)xprt->xp_rtaddr.buf; 324 xprt->xp_addrlen = sizeof (struct sockaddr_in); 325 } 326 #endif 327 if (__rpc_fd2sockinfo(sock, &si) && si.si_proto == IPPROTO_TCP) { 328 len = 1; 329 /* XXX fvdl - is this useful? */ 330 setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &len, sizeof (len)); 331 } 332 return (FALSE); /* there is never an rpc msg to be processed */ 333 } 334 335 /*ARGSUSED*/ 336 static enum xprt_stat 337 rendezvous_stat(xprt) 338 SVCXPRT *xprt; 339 { 340 341 return (XPRT_IDLE); 342 } 343 344 static void 345 svc_vc_destroy(xprt) 346 SVCXPRT *xprt; 347 { 348 struct cf_conn *cd; 349 struct cf_rendezvous *r; 350 351 _DIAGASSERT(xprt != NULL); 352 353 cd = (struct cf_conn *)xprt->xp_p1; 354 355 xprt_unregister(xprt); 356 if (xprt->xp_fd != RPC_ANYFD) 357 (void)close(xprt->xp_fd); 358 if (xprt->xp_port != 0) { 359 /* a rendezvouser socket */ 360 r = (struct cf_rendezvous *)xprt->xp_p1; 361 mem_free(r, sizeof (struct cf_rendezvous)); 362 xprt->xp_port = 0; 363 } else { 364 /* an actual connection socket */ 365 XDR_DESTROY(&(cd->xdrs)); 366 mem_free(cd, sizeof(struct cf_conn)); 367 } 368 if (xprt->xp_rtaddr.buf) 369 mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.maxlen); 370 if (xprt->xp_ltaddr.buf) 371 mem_free(xprt->xp_ltaddr.buf, xprt->xp_ltaddr.maxlen); 372 if (xprt->xp_tp) 373 free(xprt->xp_tp); 374 if (xprt->xp_netid) 375 free(xprt->xp_netid); 376 mem_free(xprt, sizeof(SVCXPRT)); 377 } 378 379 static bool_t 380 svc_vc_control(xprt, rq, in) 381 SVCXPRT *xprt; 382 const u_int rq; 383 void *in; 384 { 385 return (FALSE); 386 } 387 388 /* 389 * reads data from the tcp conection. 390 * any error is fatal and the connection is closed. 391 * (And a read of zero bytes is a half closed stream => error.) 392 * All read operations timeout after 35 seconds. A timeout is 393 * fatal for the connection. 394 */ 395 static int 396 read_vc(xprtp, buf, len) 397 caddr_t xprtp; 398 caddr_t buf; 399 int len; 400 { 401 SVCXPRT *xprt; 402 int sock; 403 int milliseconds = 35 * 1000; 404 struct pollfd pollfd; 405 struct sockaddr *sa; 406 struct msghdr msg; 407 struct cmsghdr *cmp; 408 struct credmsg crmsg; 409 struct sockcred *sc; 410 411 xprt = (SVCXPRT *)(void *)xprtp; 412 _DIAGASSERT(xprt != NULL); 413 414 sock = xprt->xp_fd; 415 416 sa = (struct sockaddr *)xprt->xp_rtaddr.buf; 417 if (sa->sa_family == AF_LOCAL && xprt->xp_p2 == NULL) { 418 memset(&msg, 0, sizeof msg); 419 msg.msg_control = (caddr_t)&crmsg; 420 msg.msg_controllen = sizeof crmsg; 421 422 if (recvmsg(sock, &msg, 0) < 0) 423 goto fatal_err; 424 425 cmp = CMSG_FIRSTHDR(&msg); 426 if (cmp->cmsg_level != SOL_SOCKET || 427 cmp->cmsg_type != SCM_CREDS) 428 goto fatal_err; 429 430 sc = (struct sockcred *)CMSG_DATA(cmp); 431 432 xprt->xp_p2 = mem_alloc(SOCKCREDSIZE(sc->sc_ngroups)); 433 if (xprt->xp_p2 == NULL) 434 goto fatal_err; 435 436 memcpy(xprt->xp_p2, sc, SOCKCREDSIZE(sc->sc_ngroups)); 437 } 438 439 do { 440 pollfd.fd = sock; 441 pollfd.events = POLLIN; 442 switch (poll(&pollfd, 1, milliseconds)) { 443 case -1: 444 if (errno == EINTR) { 445 continue; 446 } 447 /*FALLTHROUGH*/ 448 case 0: 449 goto fatal_err; 450 451 default: 452 break; 453 } 454 } while ((pollfd.revents & POLLIN) == 0); 455 456 if ((len = read(sock, buf, (size_t)len)) > 0) 457 return (len); 458 459 fatal_err: 460 ((struct cf_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED; 461 return (-1); 462 } 463 464 /* 465 * writes data to the tcp connection. 466 * Any error is fatal and the connection is closed. 467 */ 468 static int 469 write_vc(xprtp, buf, len) 470 caddr_t xprtp; 471 caddr_t buf; 472 int len; 473 { 474 SVCXPRT *xprt; 475 int i, cnt; 476 477 xprt = (SVCXPRT *)(void *)xprtp; 478 _DIAGASSERT(xprt != NULL); 479 480 for (cnt = len; cnt > 0; cnt -= i, buf += i) { 481 if ((i = write(xprt->xp_fd, buf, (size_t)cnt)) < 0) { 482 ((struct cf_conn *)(xprt->xp_p1))->strm_stat = 483 XPRT_DIED; 484 return (-1); 485 } 486 } 487 return (len); 488 } 489 490 static enum xprt_stat 491 svc_vc_stat(xprt) 492 SVCXPRT *xprt; 493 { 494 struct cf_conn *cd; 495 496 _DIAGASSERT(xprt != NULL); 497 498 cd = (struct cf_conn *)(xprt->xp_p1); 499 500 if (cd->strm_stat == XPRT_DIED) 501 return (XPRT_DIED); 502 if (! xdrrec_eof(&(cd->xdrs))) 503 return (XPRT_MOREREQS); 504 return (XPRT_IDLE); 505 } 506 507 static bool_t 508 svc_vc_recv(xprt, msg) 509 SVCXPRT *xprt; 510 struct rpc_msg *msg; 511 { 512 struct cf_conn *cd; 513 XDR *xdrs; 514 515 _DIAGASSERT(xprt != NULL); 516 _DIAGASSERT(msg != NULL); 517 518 cd = (struct cf_conn *)(xprt->xp_p1); 519 xdrs = &(cd->xdrs); 520 521 xdrs->x_op = XDR_DECODE; 522 (void)xdrrec_skiprecord(xdrs); 523 if (xdr_callmsg(xdrs, msg)) { 524 cd->x_id = msg->rm_xid; 525 return (TRUE); 526 } 527 cd->strm_stat = XPRT_DIED; 528 return (FALSE); 529 } 530 531 static bool_t 532 svc_vc_getargs(xprt, xdr_args, args_ptr) 533 SVCXPRT *xprt; 534 xdrproc_t xdr_args; 535 caddr_t args_ptr; 536 { 537 538 _DIAGASSERT(xprt != NULL); 539 /* args_ptr may be NULL */ 540 541 return ((*xdr_args)(&(((struct cf_conn *)(xprt->xp_p1))->xdrs), 542 args_ptr)); 543 } 544 545 static bool_t 546 svc_vc_freeargs(xprt, xdr_args, args_ptr) 547 SVCXPRT *xprt; 548 xdrproc_t xdr_args; 549 caddr_t args_ptr; 550 { 551 XDR *xdrs; 552 553 _DIAGASSERT(xprt != NULL); 554 /* args_ptr may be NULL */ 555 556 xdrs = &(((struct cf_conn *)(xprt->xp_p1))->xdrs); 557 558 xdrs->x_op = XDR_FREE; 559 return ((*xdr_args)(xdrs, args_ptr)); 560 } 561 562 static bool_t 563 svc_vc_reply(xprt, msg) 564 SVCXPRT *xprt; 565 struct rpc_msg *msg; 566 { 567 struct cf_conn *cd; 568 XDR *xdrs; 569 bool_t stat; 570 571 _DIAGASSERT(xprt != NULL); 572 _DIAGASSERT(msg != NULL); 573 574 cd = (struct cf_conn *)(xprt->xp_p1); 575 xdrs = &(cd->xdrs); 576 577 xdrs->x_op = XDR_ENCODE; 578 msg->rm_xid = cd->x_id; 579 stat = xdr_replymsg(xdrs, msg); 580 (void)xdrrec_endofrecord(xdrs, TRUE); 581 return (stat); 582 } 583 584 static void 585 svc_vc_ops(xprt) 586 SVCXPRT *xprt; 587 { 588 static struct xp_ops ops; 589 static struct xp_ops2 ops2; 590 #ifdef __REENT 591 extern mutex_t ops_lock; 592 #endif 593 594 /* VARIABLES PROTECTED BY ops_lock: ops, ops2 */ 595 596 mutex_lock(&ops_lock); 597 if (ops.xp_recv == NULL) { 598 ops.xp_recv = svc_vc_recv; 599 ops.xp_stat = svc_vc_stat; 600 ops.xp_getargs = svc_vc_getargs; 601 ops.xp_reply = svc_vc_reply; 602 ops.xp_freeargs = svc_vc_freeargs; 603 ops.xp_destroy = svc_vc_destroy; 604 ops2.xp_control = svc_vc_control; 605 } 606 xprt->xp_ops = &ops; 607 xprt->xp_ops2 = &ops2; 608 mutex_unlock(&ops_lock); 609 } 610 611 static void 612 svc_vc_rendezvous_ops(xprt) 613 SVCXPRT *xprt; 614 { 615 static struct xp_ops ops; 616 static struct xp_ops2 ops2; 617 #ifdef __REENT 618 extern mutex_t ops_lock; 619 #endif 620 621 mutex_lock(&ops_lock); 622 if (ops.xp_recv == NULL) { 623 ops.xp_recv = rendezvous_request; 624 ops.xp_stat = rendezvous_stat; 625 ops.xp_getargs = 626 (bool_t (*) __P((SVCXPRT *, xdrproc_t, caddr_t)))abort; 627 ops.xp_reply = 628 (bool_t (*) __P((SVCXPRT *, struct rpc_msg *)))abort; 629 ops.xp_freeargs = 630 (bool_t (*) __P((SVCXPRT *, xdrproc_t, caddr_t)))abort, 631 ops.xp_destroy = svc_vc_destroy; 632 ops2.xp_control = svc_vc_control; 633 } 634 xprt->xp_ops = &ops; 635 xprt->xp_ops2 = &ops2; 636 mutex_unlock(&ops_lock); 637 } 638
Indexes created Thu Oct 02 14:10:14 GMT 2025