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 *sccsid = "@(#)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 "namespace.h" 48 #include "reentrant.h" 49 #include <sys/types.h> 50 #include <sys/param.h> 51 #include <sys/poll.h> 52 #include <sys/socket.h> 53 #include <sys/un.h> 54 #include <sys/uio.h> 55 #include <netinet/in.h> 56 #include <netinet/tcp.h> 57 58 #include <assert.h> 59 #include <err.h> 60 #include <errno.h> 61 #include <stdio.h> 62 #include <stdlib.h> 63 #include <string.h> 64 #include <unistd.h> 65 66 #include <rpc/rpc.h> 67 68 #include "rpc_com.h" 69 #include "un-namespace.h" 70 71 struct cmessage { 72 struct cmsghdr cmsg; 73 struct cmsgcred cmcred; 74 }; 75 76 static SVCXPRT *makefd_xprt(int, u_int, u_int); 77 static bool_t rendezvous_request(SVCXPRT *, struct rpc_msg *); 78 static enum xprt_stat rendezvous_stat(SVCXPRT *); 79 static void svc_vc_destroy(SVCXPRT *); 80 static int read_vc(void *, void *, int); 81 static int write_vc(void *, void *, int); 82 static enum xprt_stat svc_vc_stat(SVCXPRT *); 83 static bool_t svc_vc_recv(SVCXPRT *, struct rpc_msg *); 84 static bool_t svc_vc_getargs(SVCXPRT *, xdrproc_t, void *); 85 static bool_t svc_vc_freeargs(SVCXPRT *, xdrproc_t, void *); 86 static bool_t svc_vc_reply(SVCXPRT *, struct rpc_msg *); 87 static void svc_vc_rendezvous_ops(SVCXPRT *); 88 static void svc_vc_ops(SVCXPRT *); 89 static bool_t svc_vc_control(SVCXPRT *xprt, const u_int rq, void *in); 90 static int __msgread_withcred(int, void *, size_t, struct cmessage *); 91 static int __msgwrite(int, void *, size_t); 92 93 struct cf_rendezvous { /* kept in xprt->xp_p1 for rendezvouser */ 94 u_int sendsize; 95 u_int recvsize; 96 }; 97 98 struct cf_conn { /* kept in xprt->xp_p1 for actual connection */ 99 enum xprt_stat strm_stat; 100 u_int32_t x_id; 101 XDR xdrs; 102 char verf_body[MAX_AUTH_BYTES]; 103 }; 104 105 /* 106 * Usage: 107 * xprt = svc_vc_create(sock, send_buf_size, recv_buf_size); 108 * 109 * Creates, registers, and returns a (rpc) tcp based transporter. 110 * Once *xprt is initialized, it is registered as a transporter 111 * see (svc.h, xprt_register). This routine returns 112 * a NULL if a problem occurred. 113 * 114 * The filedescriptor passed in is expected to refer to a bound, but 115 * not yet connected socket. 116 * 117 * Since streams do buffered io similar to stdio, the caller can specify 118 * how big the send and receive buffers are via the second and third parms; 119 * 0 => use the system default. 120 */ 121 SVCXPRT * 122 svc_vc_create(fd, sendsize, recvsize) 123 int fd; 124 u_int sendsize; 125 u_int recvsize; 126 { 127 SVCXPRT *xprt; 128 struct cf_rendezvous *r = NULL; 129 struct __rpc_sockinfo si; 130 struct sockaddr_storage sslocal; 131 socklen_t slen; 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 = 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 xprt->xp_ltaddr.maxlen = xprt->xp_ltaddr.len = sslocal.ss_len; 163 xprt->xp_ltaddr.buf = mem_alloc((size_t)sslocal.ss_len); 164 if (xprt->xp_ltaddr.buf == NULL) { 165 warnx("svc_vc_create: no mem for local addr"); 166 goto cleanup_svc_vc_create; 167 } 168 memcpy(xprt->xp_ltaddr.buf, &sslocal, (size_t)sslocal.ss_len); 169 170 xprt->xp_rtaddr.maxlen = sizeof (struct sockaddr_storage); 171 xprt_register(xprt); 172 return (xprt); 173 cleanup_svc_vc_create: 174 if (r != NULL) 175 mem_free(r, sizeof(*r)); 176 return (NULL); 177 } 178 179 /* 180 * Like svtcp_create(), except the routine takes any *open* UNIX file 181 * descriptor as its first input. 182 */ 183 SVCXPRT * 184 svc_fd_create(fd, sendsize, recvsize) 185 int fd; 186 u_int sendsize; 187 u_int recvsize; 188 { 189 struct sockaddr_storage ss; 190 socklen_t slen; 191 SVCXPRT *ret; 192 193 assert(fd != -1); 194 195 ret = makefd_xprt(fd, sendsize, recvsize); 196 if (ret == NULL) 197 return NULL; 198 199 slen = sizeof (struct sockaddr_storage); 200 if (_getsockname(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) { 201 warnx("svc_fd_create: could not retrieve local addr"); 202 goto freedata; 203 } 204 ret->xp_ltaddr.maxlen = ret->xp_ltaddr.len = ss.ss_len; 205 ret->xp_ltaddr.buf = mem_alloc((size_t)ss.ss_len); 206 if (ret->xp_ltaddr.buf == NULL) { 207 warnx("svc_fd_create: no mem for local addr"); 208 goto freedata; 209 } 210 memcpy(ret->xp_ltaddr.buf, &ss, (size_t)ss.ss_len); 211 212 slen = sizeof (struct sockaddr_storage); 213 if (_getpeername(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) { 214 warnx("svc_fd_create: could not retrieve remote addr"); 215 goto freedata; 216 } 217 ret->xp_rtaddr.maxlen = ret->xp_rtaddr.len = ss.ss_len; 218 ret->xp_rtaddr.buf = mem_alloc((size_t)ss.ss_len); 219 if (ret->xp_rtaddr.buf == NULL) { 220 warnx("svc_fd_create: no mem for local addr"); 221 goto freedata; 222 } 223 memcpy(ret->xp_rtaddr.buf, &ss, (size_t)ss.ss_len); 224 #ifdef PORTMAP 225 if (ss.ss_family == AF_INET || ss.ss_family == AF_LOCAL) { 226 ret->xp_raddr = *(struct sockaddr_in *)ret->xp_rtaddr.buf; 227 ret->xp_addrlen = sizeof (struct sockaddr_in); 228 } 229 #endif /* PORTMAP */ 230 231 return ret; 232 233 freedata: 234 if (ret->xp_ltaddr.buf != NULL) 235 mem_free(ret->xp_ltaddr.buf, rep->xp_ltaddr.maxlen); 236 237 return NULL; 238 } 239 240 static SVCXPRT * 241 makefd_xprt(fd, sendsize, recvsize) 242 int fd; 243 u_int sendsize; 244 u_int recvsize; 245 { 246 SVCXPRT *xprt; 247 struct cf_conn *cd; 248 const char *netid; 249 struct __rpc_sockinfo si; 250 251 assert(fd != -1); 252 253 xprt = mem_alloc(sizeof(SVCXPRT)); 254 if (xprt == NULL) { 255 warnx("svc_vc: makefd_xprt: out of memory"); 256 goto done; 257 } 258 memset(xprt, 0, sizeof *xprt); 259 cd = mem_alloc(sizeof(struct cf_conn)); 260 if (cd == NULL) { 261 warnx("svc_tcp: makefd_xprt: out of memory"); 262 mem_free(xprt, sizeof(SVCXPRT)); 263 xprt = NULL; 264 goto done; 265 } 266 cd->strm_stat = XPRT_IDLE; 267 xdrrec_create(&(cd->xdrs), sendsize, recvsize, 268 xprt, read_vc, write_vc); 269 xprt->xp_p1 = cd; 270 xprt->xp_verf.oa_base = cd->verf_body; 271 svc_vc_ops(xprt); /* truely deals with calls */ 272 xprt->xp_port = 0; /* this is a connection, not a rendezvouser */ 273 xprt->xp_fd = fd; 274 if (__rpc_fd2sockinfo(fd, &si) && __rpc_sockinfo2netid(&si, &netid)) 275 xprt->xp_netid = strdup(netid); 276 277 xprt_register(xprt); 278 done: 279 return (xprt); 280 } 281 282 /*ARGSUSED*/ 283 static bool_t 284 rendezvous_request(xprt, msg) 285 SVCXPRT *xprt; 286 struct rpc_msg *msg; 287 { 288 int sock; 289 struct cf_rendezvous *r; 290 struct sockaddr_storage addr; 291 socklen_t len; 292 struct __rpc_sockinfo si; 293 294 assert(xprt != NULL); 295 assert(msg != NULL); 296 297 r = (struct cf_rendezvous *)xprt->xp_p1; 298 again: 299 len = sizeof addr; 300 if ((sock = _accept(xprt->xp_fd, (struct sockaddr *)(void *)&addr, 301 &len)) < 0) { 302 if (errno == EINTR) 303 goto again; 304 return (FALSE); 305 } 306 /* 307 * make a new transporter (re-uses xprt) 308 */ 309 xprt = makefd_xprt(sock, r->sendsize, r->recvsize); 310 xprt->xp_rtaddr.buf = mem_alloc(len); 311 if (xprt->xp_rtaddr.buf == NULL) 312 return (FALSE); 313 memcpy(xprt->xp_rtaddr.buf, &addr, len); 314 xprt->xp_rtaddr.len = len; 315 #ifdef PORTMAP 316 if (addr.ss_family == AF_INET || addr.ss_family == AF_LOCAL) { 317 xprt->xp_raddr = *(struct sockaddr_in *)xprt->xp_rtaddr.buf; 318 xprt->xp_addrlen = sizeof (struct sockaddr_in); 319 } 320 #endif /* PORTMAP */ 321 if (__rpc_fd2sockinfo(sock, &si) && si.si_proto == IPPROTO_TCP) { 322 len = 1; 323 /* XXX fvdl - is this useful? */ 324 _setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &len, sizeof (len)); 325 } 326 return (FALSE); /* there is never an rpc msg to be processed */ 327 } 328 329 /*ARGSUSED*/ 330 static enum xprt_stat 331 rendezvous_stat(xprt) 332 SVCXPRT *xprt; 333 { 334 335 return (XPRT_IDLE); 336 } 337 338 static void 339 svc_vc_destroy(xprt) 340 SVCXPRT *xprt; 341 { 342 struct cf_conn *cd; 343 struct cf_rendezvous *r; 344 345 assert(xprt != NULL); 346 347 cd = (struct cf_conn *)xprt->xp_p1; 348 349 xprt_unregister(xprt); 350 if (xprt->xp_fd != RPC_ANYFD) 351 (void)_close(xprt->xp_fd); 352 if (xprt->xp_port != 0) { 353 /* a rendezvouser socket */ 354 r = (struct cf_rendezvous *)xprt->xp_p1; 355 mem_free(r, sizeof (struct cf_rendezvous)); 356 xprt->xp_port = 0; 357 } else { 358 /* an actual connection socket */ 359 XDR_DESTROY(&(cd->xdrs)); 360 mem_free(cd, sizeof(struct cf_conn)); 361 } 362 if (xprt->xp_rtaddr.buf) 363 mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.maxlen); 364 if (xprt->xp_ltaddr.buf) 365 mem_free(xprt->xp_ltaddr.buf, xprt->xp_ltaddr.maxlen); 366 if (xprt->xp_tp) 367 free(xprt->xp_tp); 368 if (xprt->xp_netid) 369 free(xprt->xp_netid); 370 mem_free(xprt, sizeof(SVCXPRT)); 371 } 372 373 /*ARGSUSED*/ 374 static bool_t 375 svc_vc_control(xprt, rq, in) 376 SVCXPRT *xprt; 377 const u_int rq; 378 void *in; 379 { 380 return (FALSE); 381 } 382 383 /* 384 * reads data from the tcp or uip connection. 385 * any error is fatal and the connection is closed. 386 * (And a read of zero bytes is a half closed stream => error.) 387 * All read operations timeout after 35 seconds. A timeout is 388 * fatal for the connection. 389 */ 390 static int 391 read_vc(xprtp, buf, len) 392 void *xprtp; 393 void *buf; 394 int len; 395 { 396 SVCXPRT *xprt; 397 int sock; 398 int milliseconds = 35 * 1000; 399 struct pollfd pollfd; 400 struct sockaddr *sa; 401 struct cmessage *cm; 402 403 xprt = (SVCXPRT *)xprtp; 404 assert(xprt != NULL); 405 406 sock = xprt->xp_fd; 407 408 do { 409 pollfd.fd = sock; 410 pollfd.events = POLLIN; 411 pollfd.revents = 0; 412 switch (_poll(&pollfd, 1, milliseconds)) { 413 case -1: 414 if (errno == EINTR) 415 continue; 416 /*FALLTHROUGH*/ 417 case 0: 418 goto fatal_err; 419 420 default: 421 break; 422 } 423 } while ((pollfd.revents & POLLIN) == 0); 424 425 cm = NULL; 426 sa = (struct sockaddr *)xprt->xp_rtaddr.buf; 427 if (sa->sa_family == AF_LOCAL) { 428 cm = (struct cmessage *)xprt->xp_verf.oa_base; 429 if ((len = __msgread_withcred(sock, buf, len, cm)) > 0) { 430 xprt->xp_p2 = &cm->cmcred; 431 return (len); 432 } else 433 goto fatal_err; 434 } else { 435 if ((len = _read(sock, buf, (size_t)len)) > 0) 436 return (len); 437 } 438 439 fatal_err: 440 ((struct cf_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED; 441 return (-1); 442 } 443 444 /* 445 * writes data to the tcp connection. 446 * Any error is fatal and the connection is closed. 447 */ 448 static int 449 write_vc(xprtp, buf, len) 450 void *xprtp; 451 void *buf; 452 int len; 453 { 454 SVCXPRT *xprt; 455 int i, cnt; 456 struct sockaddr *sa; 457 458 xprt = (SVCXPRT *)xprtp; 459 assert(xprt != NULL); 460 461 sa = (struct sockaddr *)xprt->xp_rtaddr.buf; 462 if (sa->sa_family == AF_LOCAL) { 463 for (cnt = len; cnt > 0; cnt -= i, buf += i) { 464 if ((i = __msgwrite(xprt->xp_fd, buf, 465 (size_t)cnt)) < 0) { 466 ((struct cf_conn *)(xprt->xp_p1))->strm_stat = 467 XPRT_DIED; 468 return (-1); 469 } 470 } 471 } else { 472 for (cnt = len; cnt > 0; cnt -= i, buf += i) { 473 if ((i = _write(xprt->xp_fd, buf, 474 (size_t)cnt)) < 0) { 475 ((struct cf_conn *)(xprt->xp_p1))->strm_stat = 476 XPRT_DIED; 477 return (-1); 478 } 479 } 480 } 481 482 return (len); 483 } 484 485 static enum xprt_stat 486 svc_vc_stat(xprt) 487 SVCXPRT *xprt; 488 { 489 struct cf_conn *cd; 490 491 assert(xprt != NULL); 492 493 cd = (struct cf_conn *)(xprt->xp_p1); 494 495 if (cd->strm_stat == XPRT_DIED) 496 return (XPRT_DIED); 497 if (! xdrrec_eof(&(cd->xdrs))) 498 return (XPRT_MOREREQS); 499 return (XPRT_IDLE); 500 } 501 502 static bool_t 503 svc_vc_recv(xprt, msg) 504 SVCXPRT *xprt; 505 struct rpc_msg *msg; 506 { 507 struct cf_conn *cd; 508 XDR *xdrs; 509 510 assert(xprt != NULL); 511 assert(msg != NULL); 512 513 cd = (struct cf_conn *)(xprt->xp_p1); 514 xdrs = &(cd->xdrs); 515 516 xdrs->x_op = XDR_DECODE; 517 (void)xdrrec_skiprecord(xdrs); 518 if (xdr_callmsg(xdrs, msg)) { 519 cd->x_id = msg->rm_xid; 520 return (TRUE); 521 } 522 cd->strm_stat = XPRT_DIED; 523 return (FALSE); 524 } 525 526 static bool_t 527 svc_vc_getargs(xprt, xdr_args, args_ptr) 528 SVCXPRT *xprt; 529 xdrproc_t xdr_args; 530 void *args_ptr; 531 { 532 533 assert(xprt != NULL); 534 /* args_ptr may be NULL */ 535 return ((*xdr_args)(&(((struct cf_conn *)(xprt->xp_p1))->xdrs), 536 args_ptr)); 537 } 538 539 static bool_t 540 svc_vc_freeargs(xprt, xdr_args, args_ptr) 541 SVCXPRT *xprt; 542 xdrproc_t xdr_args; 543 void *args_ptr; 544 { 545 XDR *xdrs; 546 547 assert(xprt != NULL); 548 /* args_ptr may be NULL */ 549 550 xdrs = &(((struct cf_conn *)(xprt->xp_p1))->xdrs); 551 552 xdrs->x_op = XDR_FREE; 553 return ((*xdr_args)(xdrs, args_ptr)); 554 } 555 556 static bool_t 557 svc_vc_reply(xprt, msg) 558 SVCXPRT *xprt; 559 struct rpc_msg *msg; 560 { 561 struct cf_conn *cd; 562 XDR *xdrs; 563 bool_t stat; 564 565 assert(xprt != NULL); 566 assert(msg != NULL); 567 568 cd = (struct cf_conn *)(xprt->xp_p1); 569 xdrs = &(cd->xdrs); 570 571 xdrs->x_op = XDR_ENCODE; 572 msg->rm_xid = cd->x_id; 573 stat = xdr_replymsg(xdrs, msg); 574 (void)xdrrec_endofrecord(xdrs, TRUE); 575 return (stat); 576 } 577 578 static void 579 svc_vc_ops(xprt) 580 SVCXPRT *xprt; 581 { 582 static struct xp_ops ops; 583 static struct xp_ops2 ops2; 584 extern mutex_t ops_lock; 585 586 /* VARIABLES PROTECTED BY ops_lock: ops, ops2 */ 587 588 mutex_lock(&ops_lock); 589 if (ops.xp_recv == NULL) { 590 ops.xp_recv = svc_vc_recv; 591 ops.xp_stat = svc_vc_stat; 592 ops.xp_getargs = svc_vc_getargs; 593 ops.xp_reply = svc_vc_reply; 594 ops.xp_freeargs = svc_vc_freeargs; 595 ops.xp_destroy = svc_vc_destroy; 596 ops2.xp_control = svc_vc_control; 597 } 598 xprt->xp_ops = &ops; 599 xprt->xp_ops2 = &ops2; 600 mutex_unlock(&ops_lock); 601 } 602 603 static void 604 svc_vc_rendezvous_ops(xprt) 605 SVCXPRT *xprt; 606 { 607 static struct xp_ops ops; 608 static struct xp_ops2 ops2; 609 extern mutex_t ops_lock; 610 611 mutex_lock(&ops_lock); 612 if (ops.xp_recv == NULL) { 613 ops.xp_recv = rendezvous_request; 614 ops.xp_stat = rendezvous_stat; 615 ops.xp_getargs = 616 (bool_t (*)(SVCXPRT *, xdrproc_t, void *))abort; 617 ops.xp_reply = 618 (bool_t (*)(SVCXPRT *, struct rpc_msg *))abort; 619 ops.xp_freeargs = 620 (bool_t (*)(SVCXPRT *, xdrproc_t, void *))abort, 621 ops.xp_destroy = svc_vc_destroy; 622 ops2.xp_control = svc_vc_control; 623 } 624 xprt->xp_ops = &ops; 625 xprt->xp_ops2 = &ops2; 626 mutex_unlock(&ops_lock); 627 } 628 629 int 630 __msgread_withcred(sock, buf, cnt, cmp) 631 int sock; 632 void *buf; 633 size_t cnt; 634 struct cmessage *cmp; 635 { 636 struct iovec iov[1]; 637 struct msghdr msg; 638 union { 639 struct cmsghdr cmsg; 640 char control[CMSG_SPACE(sizeof(struct cmsgcred))]; 641 } cm; 642 int ret; 643 644 645 bzero(&cm, sizeof(cm)); 646 iov[0].iov_base = buf; 647 iov[0].iov_len = cnt; 648 649 msg.msg_iov = iov; 650 msg.msg_iovlen = 1; 651 msg.msg_name = NULL; 652 msg.msg_namelen = 0; 653 msg.msg_control = &cm; 654 msg.msg_controllen = CMSG_SPACE(sizeof(struct cmsgcred)); 655 msg.msg_flags = 0; 656 657 ret = _recvmsg(sock, &msg, 0); 658 bcopy(&cm.cmsg, &cmp->cmsg, sizeof(cmp->cmsg)); 659 bcopy(CMSG_DATA(&cm), &cmp->cmcred, sizeof(cmp->cmcred)); 660 661 if (msg.msg_controllen == 0 || 662 (msg.msg_flags & MSG_CTRUNC) != 0) 663 return (-1); 664 665 return (ret); 666 } 667 668 static int 669 __msgwrite(sock, buf, cnt) 670 int sock; 671 void *buf; 672 size_t cnt; 673 { 674 struct iovec iov[1]; 675 struct msghdr msg; 676 struct cmessage cm; 677 678 bzero((char *)&cm, sizeof(cm)); 679 iov[0].iov_base = buf; 680 iov[0].iov_len = cnt; 681 682 cm.cmsg.cmsg_type = SCM_CREDS; 683 cm.cmsg.cmsg_level = SOL_SOCKET; 684 cm.cmsg.cmsg_len = sizeof(struct cmessage); 685 686 msg.msg_iov = iov; 687 msg.msg_iovlen = 1; 688 msg.msg_name = NULL; 689 msg.msg_namelen = 0; 690 msg.msg_control = &cm; 691 msg.msg_controllen = sizeof(struct cmessage); 692 msg.msg_flags = 0; 693 694 return(_sendmsg(sock, &msg, 0)); 695 } 696 697 /* 698 * Get the effective UID of the sending process. Used by rpcbind and keyserv 699 * (AF_LOCAL). 700 */ 701 int 702 __rpc_get_local_uid(SVCXPRT *transp, uid_t *uid) 703 { 704 struct cmsgcred *cmcred; 705 struct cmessage *cm; 706 struct cmsghdr *cmp; 707 708 cm = (struct cmessage *)transp->xp_verf.oa_base; 709 710 if (cm == NULL) 711 return (-1); 712 cmp = &cm->cmsg; 713 if (cmp == NULL || cmp->cmsg_level != SOL_SOCKET || 714 cmp->cmsg_type != SCM_CREDS) 715 return (-1); 716 717 cmcred = __svc_getcallercreds(transp); 718 if (cmcred == NULL) 719 return (-1); 720 *uid = cmcred->cmcred_euid; 721 return (0); 722 } 723