1/* $NetBSD: svc_vc.c,v 1.7 2000/08/03 00:01:53 fvdl Exp $ */
2/* $FreeBSD: head/lib/libc/rpc/svc_vc.c 74627 2001-03-22 04:31:30Z alfred $ */
3
4/*
5 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
6 * unrestricted use provided that this legend is included on all tape
7 * media and as a part of the software program in whole or part. Users
8 * may copy or modify Sun RPC without charge, but are not authorized
9 * to license or distribute it to anyone else except as part of a product or
10 * program developed by the user.
11 *
12 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
13 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
14 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
15 *
16 * Sun RPC is provided with no support and without any obligation on the
17 * part of Sun Microsystems, Inc. to assist in its use, correction,
18 * modification or enhancement.
19 *
20 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
21 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
22 * OR ANY PART THEREOF.
23 *
24 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
25 * or profits or other special, indirect and consequential damages, even if
26 * Sun has been advised of the possibility of such damages.
27 *
28 * Sun Microsystems, Inc.
29 * 2550 Garcia Avenue
30 * Mountain View, California 94043
31 */
32
33#include <sys/cdefs.h>
34#if defined(LIBC_SCCS) && !defined(lint)
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#endif
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 "reentrant.h"
48#include "namespace.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#define SOCKCREDSIZE(ngrps) \
72 (sizeof(struct cmsgcred) + (sizeof(gid_t) * ((ngrps) - 1)))
73
74static SVCXPRT *makefd_xprt __P((int, u_int, u_int));
75static bool_t rendezvous_request __P((SVCXPRT *, struct rpc_msg *));
76static enum xprt_stat rendezvous_stat __P((SVCXPRT *));
77static void svc_vc_destroy __P((SVCXPRT *));
78static int read_vc __P((caddr_t, caddr_t, int));
79static int write_vc __P((caddr_t, caddr_t, int));
80static enum xprt_stat svc_vc_stat __P((SVCXPRT *));
81static bool_t svc_vc_recv __P((SVCXPRT *, struct rpc_msg *));
82static bool_t svc_vc_getargs __P((SVCXPRT *, xdrproc_t, caddr_t));
83static bool_t svc_vc_freeargs __P((SVCXPRT *, xdrproc_t, caddr_t));
84static bool_t svc_vc_reply __P((SVCXPRT *, struct rpc_msg *));
85static void svc_vc_rendezvous_ops __P((SVCXPRT *));
86static void svc_vc_ops __P((SVCXPRT *));
87static bool_t svc_vc_control __P((SVCXPRT *xprt, const u_int rq, void *in));
88static int __msgread_withcred(int, void *, size_t, struct cmessage *);
89static int __msgwrite(int, void *, size_t);
90
91struct cf_rendezvous { /* kept in xprt->xp_p1 for rendezvouser */
92 u_int sendsize;
93 u_int recvsize;
94};
95
96struct cf_conn { /* kept in xprt->xp_p1 for actual connection */
97 enum xprt_stat strm_stat;
98 u_int32_t x_id;
99 XDR xdrs;
100 char verf_body[MAX_AUTH_BYTES];
101};
102
103/*
104 * Usage:
105 * xprt = svc_vc_create(sock, send_buf_size, recv_buf_size);
106 *
107 * Creates, registers, and returns a (rpc) tcp based transporter.
108 * Once *xprt is initialized, it is registered as a transporter
109 * see (svc.h, xprt_register). This routine returns
110 * a NULL if a problem occurred.
111 *
112 * The filedescriptor passed in is expected to refer to a bound, but
113 * not yet connected socket.
114 *
115 * Since streams do buffered io similar to stdio, the caller can specify
116 * how big the send and receive buffers are via the second and third parms;
117 * 0 => use the system default.
118 */
119SVCXPRT *
120svc_vc_create(fd, sendsize, recvsize)
121 int fd;
122 u_int sendsize;
123 u_int recvsize;
124{
125 SVCXPRT *xprt;
126 struct cf_rendezvous *r = NULL;
127 struct __rpc_sockinfo si;
128 struct sockaddr_storage sslocal;
129 socklen_t slen;
130 int one = 1;
131
132 r = mem_alloc(sizeof(*r));
133 if (r == NULL) {
134 warnx("svc_vc_create: out of memory");
135 goto cleanup_svc_vc_create;
136 }
137 if (!__rpc_fd2sockinfo(fd, &si))
138 return NULL;
139 r->sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize);
140 r->recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize);
141 xprt = mem_alloc(sizeof(SVCXPRT));
142 if (xprt == NULL) {
143 warnx("svc_vc_create: out of memory");
144 goto cleanup_svc_vc_create;
145 }
146 xprt->xp_tp = NULL;
147 xprt->xp_p1 = (caddr_t)(void *)r;
148 xprt->xp_p2 = NULL;
149 xprt->xp_p3 = NULL;
150 xprt->xp_verf = _null_auth;
151 svc_vc_rendezvous_ops(xprt);
152 xprt->xp_port = (u_short)-1; /* It is the rendezvouser */
153 xprt->xp_fd = fd;
154
155 slen = sizeof (struct sockaddr_storage);
156 if (_getsockname(fd, (struct sockaddr *)(void *)&sslocal, &slen) < 0) {
157 warnx("svc_vc_create: could not retrieve local addr");
158 goto cleanup_svc_vc_create;
159 }
160
161 xprt->xp_ltaddr.maxlen = xprt->xp_ltaddr.len = sslocal.ss_len;
162 xprt->xp_ltaddr.buf = mem_alloc((size_t)sslocal.ss_len);
163 if (xprt->xp_ltaddr.buf == NULL) {
164 warnx("svc_vc_create: no mem for local addr");
165 goto cleanup_svc_vc_create;
166 }
167 memcpy(xprt->xp_ltaddr.buf, &sslocal, (size_t)sslocal.ss_len);
168
169 xprt->xp_rtaddr.maxlen = sizeof (struct sockaddr_storage);
170 xprt_register(xprt);
171 return (xprt);
172cleanup_svc_vc_create:
173 if (r != NULL)
174 mem_free(r, sizeof(*r));
175 return (NULL);
176}
177
178/*
179 * Like svtcp_create(), except the routine takes any *open* UNIX file
180 * descriptor as its first input.
181 */
182SVCXPRT *
183svc_fd_create(fd, sendsize, recvsize)
184 int fd;
185 u_int sendsize;
186 u_int recvsize;
187{
188 struct sockaddr_storage ss;
189 socklen_t slen;
190 SVCXPRT *ret;
191
192 assert(fd != -1);
193
194 ret = makefd_xprt(fd, sendsize, recvsize);
195 if (ret == NULL)
196 return NULL;
197
198 slen = sizeof (struct sockaddr_storage);
199 if (_getsockname(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) {
200 warnx("svc_fd_create: could not retrieve local addr");
201 goto freedata;
202 }
203 ret->xp_ltaddr.maxlen = ret->xp_ltaddr.len = ss.ss_len;
204 ret->xp_ltaddr.buf = mem_alloc((size_t)ss.ss_len);
205 if (ret->xp_ltaddr.buf == NULL) {
206 warnx("svc_fd_create: no mem for local addr");
207 goto freedata;
208 }
209 memcpy(ret->xp_ltaddr.buf, &ss, (size_t)ss.ss_len);
210
211 slen = sizeof (struct sockaddr_storage);
212 if (_getpeername(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) {
213 warnx("svc_fd_create: could not retrieve remote addr");
214 goto freedata;
215 }
216 ret->xp_rtaddr.maxlen = ret->xp_rtaddr.len = ss.ss_len;
217 ret->xp_rtaddr.buf = mem_alloc((size_t)ss.ss_len);
218 if (ret->xp_rtaddr.buf == NULL) {
219 warnx("svc_fd_create: no mem for local addr");
220 goto freedata;
221 }
222 memcpy(ret->xp_rtaddr.buf, &ss, (size_t)ss.ss_len);
223#ifdef PORTMAP
224 if (ss.ss_family == AF_INET) {
225 ret->xp_raddr = *(struct sockaddr_in *)ret->xp_rtaddr.buf;
226 ret->xp_addrlen = sizeof (struct sockaddr_in);
227 }
228#endif /* PORTMAP */
229
230 return ret;
231
232freedata:
233 if (ret->xp_ltaddr.buf != NULL)
234 mem_free(ret->xp_ltaddr.buf, rep->xp_ltaddr.maxlen);
235
236 return NULL;
237}
238
239static SVCXPRT *
240makefd_xprt(fd, sendsize, recvsize)
241 int fd;
242 u_int sendsize;
243 u_int recvsize;
244{
245 SVCXPRT *xprt;
246 struct cf_conn *cd;
247 const char *netid;
248 struct __rpc_sockinfo si;
249
250 assert(fd != -1);
251
252 xprt = mem_alloc(sizeof(SVCXPRT));
253 if (xprt == NULL) {
254 warnx("svc_vc: makefd_xprt: out of memory");
255 goto done;
256 }
257 memset(xprt, 0, sizeof *xprt);
258 cd = mem_alloc(sizeof(struct cf_conn));
259 if (cd == NULL) {
260 warnx("svc_tcp: makefd_xprt: out of memory");
261 mem_free(xprt, sizeof(SVCXPRT));
262 xprt = NULL;
263 goto done;
264 }
265 cd->strm_stat = XPRT_IDLE;
266 xdrrec_create(&(cd->xdrs), sendsize, recvsize,
267 (caddr_t)(void *)xprt, read_vc, write_vc);
268 xprt->xp_p1 = (caddr_t)(void *)cd;
269 xprt->xp_verf.oa_base = cd->verf_body;
270 svc_vc_ops(xprt); /* truely deals with calls */
271 xprt->xp_port = 0; /* this is a connection, not a rendezvouser */
272 xprt->xp_fd = fd;
273 if (__rpc_fd2sockinfo(fd, &si) && __rpc_sockinfo2netid(&si, &netid))
274 xprt->xp_netid = strdup(netid);
275
276 xprt_register(xprt);
277done:
278 return (xprt);
279}
280
281/*ARGSUSED*/
282static bool_t
283rendezvous_request(xprt, msg)
284 SVCXPRT *xprt;
285 struct rpc_msg *msg;
286{
287 int sock;
288 struct cf_rendezvous *r;
289 struct sockaddr_storage addr;
290 socklen_t len;
291 struct __rpc_sockinfo si;
292
293 assert(xprt != NULL);
294 assert(msg != NULL);
295
296 r = (struct cf_rendezvous *)xprt->xp_p1;
297again:
298 len = sizeof addr;
299 if ((sock = _accept(xprt->xp_fd, (struct sockaddr *)(void *)&addr,
300 &len)) < 0) {
301 if (errno == EINTR)
302 goto again;
303 return (FALSE);
304 }
305 /*
306 * make a new transporter (re-uses xprt)
307 */
308 xprt = makefd_xprt(sock, r->sendsize, r->recvsize);
309 xprt->xp_rtaddr.buf = mem_alloc(len);
310 if (xprt->xp_rtaddr.buf == NULL)
311 return (FALSE);
312 memcpy(xprt->xp_rtaddr.buf, &addr, len);
313 xprt->xp_rtaddr.len = len;
314#ifdef PORTMAP
315 if (addr.ss_family == AF_INET) {
316 xprt->xp_raddr = *(struct sockaddr_in *)xprt->xp_rtaddr.buf;
317 xprt->xp_addrlen = sizeof (struct sockaddr_in);
318 }
319#endif /* PORTMAP */
320 if (__rpc_fd2sockinfo(sock, &si) && si.si_proto == IPPROTO_TCP) {
321 len = 1;
322 /* XXX fvdl - is this useful? */
323 _setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &len, sizeof (len));
324 }
325 return (FALSE); /* there is never an rpc msg to be processed */
326}
327
328/*ARGSUSED*/
329static enum xprt_stat
330rendezvous_stat(xprt)
331 SVCXPRT *xprt;
332{
333
334 return (XPRT_IDLE);
335}
336
337static void
338svc_vc_destroy(xprt)
339 SVCXPRT *xprt;
340{
341 struct cf_conn *cd;
342 struct cf_rendezvous *r;
343
344 assert(xprt != NULL);
345
346 cd = (struct cf_conn *)xprt->xp_p1;
347
348 xprt_unregister(xprt);
349 if (xprt->xp_fd != RPC_ANYFD)
350 (void)_close(xprt->xp_fd);
351 if (xprt->xp_port != 0) {
352 /* a rendezvouser socket */
353 r = (struct cf_rendezvous *)xprt->xp_p1;
354 mem_free(r, sizeof (struct cf_rendezvous));
355 xprt->xp_port = 0;
356 } else {
357 /* an actual connection socket */
358 XDR_DESTROY(&(cd->xdrs));
359 mem_free(cd, sizeof(struct cf_conn));
360 }
361 if (xprt->xp_rtaddr.buf)
362 mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.maxlen);
363 if (xprt->xp_ltaddr.buf)
364 mem_free(xprt->xp_ltaddr.buf, xprt->xp_ltaddr.maxlen);
365 if (xprt->xp_tp)
366 free(xprt->xp_tp);
367 if (xprt->xp_netid)
368 free(xprt->xp_netid);
369 mem_free(xprt, sizeof(SVCXPRT));
370}
371
372/*ARGSUSED*/
373static bool_t
374svc_vc_control(xprt, rq, in)
375 SVCXPRT *xprt;
376 const u_int rq;
377 void *in;
378{
379 return (FALSE);
380}
381
382/*
383 * reads data from the tcp or uip connection.
384 * any error is fatal and the connection is closed.
385 * (And a read of zero bytes is a half closed stream => error.)
386 * All read operations timeout after 35 seconds. A timeout is
387 * fatal for the connection.
388 */
389static int
390read_vc(xprtp, buf, len)
391 caddr_t xprtp;
392 caddr_t buf;
393 int len;
394{
395 SVCXPRT *xprt;
396 int sock;
397 int milliseconds = 35 * 1000;
398 struct pollfd pollfd;
399 struct sockaddr *sa;
400 struct cmessage *cm;
401 struct cmsghdr *cmp;
402 struct sockcred *sc;
403
404 xprt = (SVCXPRT *)(void *)xprtp;
405 assert(xprt != NULL);
406
407 sock = xprt->xp_fd;
408
409 do {
410 pollfd.fd = sock;
411 pollfd.events = POLLIN;
412 pollfd.revents = 0;
413 switch (_poll(&pollfd, 1, milliseconds)) {
414 case -1:
415 if (errno == EINTR)
416 continue;
417 /*FALLTHROUGH*/
418 case 0:
419 goto fatal_err;
420
421 default:
422 break;
423 }
424 } while ((pollfd.revents & POLLIN) == 0);
425
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 cmp = &cm->cmsg;
431 sc = (struct sockcred *)(void *)CMSG_DATA(cmp);
432 xprt->xp_p2 = sc;
433 return (len);
434 }
435 } else {
436 if ((len = _read(sock, buf, (size_t)len)) > 0)
437 return (len);
438 }
439
440fatal_err:
441 ((struct cf_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;
442 return (-1);
443}
444
445/*
446 * writes data to the tcp connection.
447 * Any error is fatal and the connection is closed.
448 */
449static int
450write_vc(xprtp, buf, len)
451 caddr_t xprtp;
452 caddr_t buf;
453 int len;
454{
455 SVCXPRT *xprt;
456 int i, cnt;
457 struct sockaddr *sa;
458
459 xprt = (SVCXPRT *)(void *)xprtp;
460 assert(xprt != NULL);
461
462 sa = (struct sockaddr *)xprt->xp_rtaddr.buf;
463 if (sa->sa_family == AF_LOCAL) {
464 for (cnt = len; cnt > 0; cnt -= i, buf += i) {
465 if ((i = __msgwrite(xprt->xp_fd, buf,
466 (size_t)cnt)) < 0) {
467 ((struct cf_conn *)(xprt->xp_p1))->strm_stat =
468 XPRT_DIED;
469 return (-1);
470 }
471 }
472 } else {
473 for (cnt = len; cnt > 0; cnt -= i, buf += i) {
474 if ((i = _write(xprt->xp_fd, buf,
475 (size_t)cnt)) < 0) {
476 ((struct cf_conn *)(xprt->xp_p1))->strm_stat =
477 XPRT_DIED;
478 return (-1);
479 }
480 }
481 }
482
483 return (len);
484}
485
486static enum xprt_stat
487svc_vc_stat(xprt)
488 SVCXPRT *xprt;
489{
490 struct cf_conn *cd;
491
492 assert(xprt != NULL);
493
494 cd = (struct cf_conn *)(xprt->xp_p1);
495
496 if (cd->strm_stat == XPRT_DIED)
497 return (XPRT_DIED);
498 if (! xdrrec_eof(&(cd->xdrs)))
499 return (XPRT_MOREREQS);
500 return (XPRT_IDLE);
501}
502
503static bool_t
504svc_vc_recv(xprt, msg)
505 SVCXPRT *xprt;
506 struct rpc_msg *msg;
507{
508 struct cf_conn *cd;
509 XDR *xdrs;
510
511 assert(xprt != NULL);
512 assert(msg != NULL);
513
514 cd = (struct cf_conn *)(xprt->xp_p1);
515 xdrs = &(cd->xdrs);
516
517 xdrs->x_op = XDR_DECODE;
518 (void)xdrrec_skiprecord(xdrs);
519 if (xdr_callmsg(xdrs, msg)) {
520 cd->x_id = msg->rm_xid;
521 return (TRUE);
522 }
523 cd->strm_stat = XPRT_DIED;
524 return (FALSE);
525}
526
527static bool_t
528svc_vc_getargs(xprt, xdr_args, args_ptr)
529 SVCXPRT *xprt;
530 xdrproc_t xdr_args;
531 caddr_t args_ptr;
532{
533
534 assert(xprt != NULL);
535 /* args_ptr may be NULL */
536 return ((*xdr_args)(&(((struct cf_conn *)(xprt->xp_p1))->xdrs),
537 args_ptr));
538}
539
540static bool_t
541svc_vc_freeargs(xprt, xdr_args, args_ptr)
542 SVCXPRT *xprt;
543 xdrproc_t xdr_args;
544 caddr_t args_ptr;
545{
546 XDR *xdrs;
547
548 assert(xprt != NULL);
549 /* args_ptr may be NULL */
550
551 xdrs = &(((struct cf_conn *)(xprt->xp_p1))->xdrs);
552
553 xdrs->x_op = XDR_FREE;
554 return ((*xdr_args)(xdrs, args_ptr));
555}
556
557static bool_t
558svc_vc_reply(xprt, msg)
559 SVCXPRT *xprt;
560 struct rpc_msg *msg;
561{
562 struct cf_conn *cd;
563 XDR *xdrs;
564 bool_t stat;
565
566 assert(xprt != NULL);
567 assert(msg != NULL);
568
569 cd = (struct cf_conn *)(xprt->xp_p1);
570 xdrs = &(cd->xdrs);
571
572 xdrs->x_op = XDR_ENCODE;
573 msg->rm_xid = cd->x_id;
574 stat = xdr_replymsg(xdrs, msg);
575 (void)xdrrec_endofrecord(xdrs, TRUE);
576 return (stat);
577}
578
579static void
580svc_vc_ops(xprt)
581 SVCXPRT *xprt;
582{
583 static struct xp_ops ops;
584 static struct xp_ops2 ops2;
585 extern mutex_t ops_lock;
586
587/* VARIABLES PROTECTED BY ops_lock: ops, ops2 */
588
589 mutex_lock(&ops_lock);
590 if (ops.xp_recv == NULL) {
591 ops.xp_recv = svc_vc_recv;
592 ops.xp_stat = svc_vc_stat;
593 ops.xp_getargs = svc_vc_getargs;
594 ops.xp_reply = svc_vc_reply;
595 ops.xp_freeargs = svc_vc_freeargs;
596 ops.xp_destroy = svc_vc_destroy;
597 ops2.xp_control = svc_vc_control;
598 }
599 xprt->xp_ops = &ops;
600 xprt->xp_ops2 = &ops2;
601 mutex_unlock(&ops_lock);
602}
603
604static void
605svc_vc_rendezvous_ops(xprt)
606 SVCXPRT *xprt;
607{
608 static struct xp_ops ops;
609 static struct xp_ops2 ops2;
610 extern mutex_t ops_lock;
611
612 mutex_lock(&ops_lock);
613 if (ops.xp_recv == NULL) {
614 ops.xp_recv = rendezvous_request;
615 ops.xp_stat = rendezvous_stat;
616 ops.xp_getargs =
617 (bool_t (*) __P((SVCXPRT *, xdrproc_t, caddr_t)))abort;
618 ops.xp_reply =
619 (bool_t (*) __P((SVCXPRT *, struct rpc_msg *)))abort;
620 ops.xp_freeargs =
621 (bool_t (*) __P((SVCXPRT *, xdrproc_t, caddr_t)))abort,
622 ops.xp_destroy = svc_vc_destroy;
623 ops2.xp_control = svc_vc_control;
624 }
625 xprt->xp_ops = &ops;
626 xprt->xp_ops2 = &ops2;
627 mutex_unlock(&ops_lock);
628}
629
630int
631__msgread_withcred(sock, buf, cnt, cmp)
632 int sock;
633 void *buf;
634 size_t cnt;
635 struct cmessage *cmp;
636{
637 struct iovec iov[1];
638 struct msghdr msg;
639
640 bzero(cmp, sizeof(*cmp));
641 iov[0].iov_base = buf;
642 iov[0].iov_len = cnt;
643
644 msg.msg_iov = iov;
645 msg.msg_iovlen = 1;
646 msg.msg_name = NULL;
647 msg.msg_namelen = 0;
648 msg.msg_control = cmp;
649 msg.msg_controllen = sizeof(struct cmessage);
650 msg.msg_flags = 0;
651
652 return(_recvmsg(sock, &msg, 0));
653}
654
655static int
656__msgwrite(sock, buf, cnt)
657 int sock;
658 void *buf;
659 size_t cnt;
660{
661 struct iovec iov[1];
662 struct msghdr msg;
663 struct cmessage cm;
664
665 bzero((char *)&cm, sizeof(cm));
666 iov[0].iov_base = buf;
667 iov[0].iov_len = cnt;
668
669 cm.cmsg.cmsg_type = SCM_CREDS;
670 cm.cmsg.cmsg_level = SOL_SOCKET;
671 cm.cmsg.cmsg_len = sizeof(struct cmessage);
672
673 msg.msg_iov = iov;
674 msg.msg_iovlen = 1;
675 msg.msg_name = NULL;
676 msg.msg_namelen = 0;
677 msg.msg_control = (caddr_t)&cm;
678 msg.msg_controllen = sizeof(struct cmessage);
679 msg.msg_flags = 0;
680
681 return(_sendmsg(sock, &msg, 0));
682}
683
684/*
685 * Get the effective UID of the sending process. Used by rpcbind and keyserv
686 * (AF_LOCAL).
687 */
688int
689__rpc_get_local_uid(SVCXPRT *transp, uid_t *uid)
690{
691 struct cmsgcred *cmcred;
692
693 cmcred = __svc_getcallercreds(transp);
694 if (cmcred == NULL)
695 return(-1);
696 *uid = cmcred->cmcred_euid;
697 return(0);
698}
2/* $FreeBSD: head/lib/libc/rpc/svc_vc.c 74627 2001-03-22 04:31:30Z alfred $ */
3
4/*
5 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
6 * unrestricted use provided that this legend is included on all tape
7 * media and as a part of the software program in whole or part. Users
8 * may copy or modify Sun RPC without charge, but are not authorized
9 * to license or distribute it to anyone else except as part of a product or
10 * program developed by the user.
11 *
12 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
13 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
14 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
15 *
16 * Sun RPC is provided with no support and without any obligation on the
17 * part of Sun Microsystems, Inc. to assist in its use, correction,
18 * modification or enhancement.
19 *
20 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
21 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
22 * OR ANY PART THEREOF.
23 *
24 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
25 * or profits or other special, indirect and consequential damages, even if
26 * Sun has been advised of the possibility of such damages.
27 *
28 * Sun Microsystems, Inc.
29 * 2550 Garcia Avenue
30 * Mountain View, California 94043
31 */
32
33#include <sys/cdefs.h>
34#if defined(LIBC_SCCS) && !defined(lint)
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#endif
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 "reentrant.h"
48#include "namespace.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#define SOCKCREDSIZE(ngrps) \
72 (sizeof(struct cmsgcred) + (sizeof(gid_t) * ((ngrps) - 1)))
73
74static SVCXPRT *makefd_xprt __P((int, u_int, u_int));
75static bool_t rendezvous_request __P((SVCXPRT *, struct rpc_msg *));
76static enum xprt_stat rendezvous_stat __P((SVCXPRT *));
77static void svc_vc_destroy __P((SVCXPRT *));
78static int read_vc __P((caddr_t, caddr_t, int));
79static int write_vc __P((caddr_t, caddr_t, int));
80static enum xprt_stat svc_vc_stat __P((SVCXPRT *));
81static bool_t svc_vc_recv __P((SVCXPRT *, struct rpc_msg *));
82static bool_t svc_vc_getargs __P((SVCXPRT *, xdrproc_t, caddr_t));
83static bool_t svc_vc_freeargs __P((SVCXPRT *, xdrproc_t, caddr_t));
84static bool_t svc_vc_reply __P((SVCXPRT *, struct rpc_msg *));
85static void svc_vc_rendezvous_ops __P((SVCXPRT *));
86static void svc_vc_ops __P((SVCXPRT *));
87static bool_t svc_vc_control __P((SVCXPRT *xprt, const u_int rq, void *in));
88static int __msgread_withcred(int, void *, size_t, struct cmessage *);
89static int __msgwrite(int, void *, size_t);
90
91struct cf_rendezvous { /* kept in xprt->xp_p1 for rendezvouser */
92 u_int sendsize;
93 u_int recvsize;
94};
95
96struct cf_conn { /* kept in xprt->xp_p1 for actual connection */
97 enum xprt_stat strm_stat;
98 u_int32_t x_id;
99 XDR xdrs;
100 char verf_body[MAX_AUTH_BYTES];
101};
102
103/*
104 * Usage:
105 * xprt = svc_vc_create(sock, send_buf_size, recv_buf_size);
106 *
107 * Creates, registers, and returns a (rpc) tcp based transporter.
108 * Once *xprt is initialized, it is registered as a transporter
109 * see (svc.h, xprt_register). This routine returns
110 * a NULL if a problem occurred.
111 *
112 * The filedescriptor passed in is expected to refer to a bound, but
113 * not yet connected socket.
114 *
115 * Since streams do buffered io similar to stdio, the caller can specify
116 * how big the send and receive buffers are via the second and third parms;
117 * 0 => use the system default.
118 */
119SVCXPRT *
120svc_vc_create(fd, sendsize, recvsize)
121 int fd;
122 u_int sendsize;
123 u_int recvsize;
124{
125 SVCXPRT *xprt;
126 struct cf_rendezvous *r = NULL;
127 struct __rpc_sockinfo si;
128 struct sockaddr_storage sslocal;
129 socklen_t slen;
130 int one = 1;
131
132 r = mem_alloc(sizeof(*r));
133 if (r == NULL) {
134 warnx("svc_vc_create: out of memory");
135 goto cleanup_svc_vc_create;
136 }
137 if (!__rpc_fd2sockinfo(fd, &si))
138 return NULL;
139 r->sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize);
140 r->recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize);
141 xprt = mem_alloc(sizeof(SVCXPRT));
142 if (xprt == NULL) {
143 warnx("svc_vc_create: out of memory");
144 goto cleanup_svc_vc_create;
145 }
146 xprt->xp_tp = NULL;
147 xprt->xp_p1 = (caddr_t)(void *)r;
148 xprt->xp_p2 = NULL;
149 xprt->xp_p3 = NULL;
150 xprt->xp_verf = _null_auth;
151 svc_vc_rendezvous_ops(xprt);
152 xprt->xp_port = (u_short)-1; /* It is the rendezvouser */
153 xprt->xp_fd = fd;
154
155 slen = sizeof (struct sockaddr_storage);
156 if (_getsockname(fd, (struct sockaddr *)(void *)&sslocal, &slen) < 0) {
157 warnx("svc_vc_create: could not retrieve local addr");
158 goto cleanup_svc_vc_create;
159 }
160
161 xprt->xp_ltaddr.maxlen = xprt->xp_ltaddr.len = sslocal.ss_len;
162 xprt->xp_ltaddr.buf = mem_alloc((size_t)sslocal.ss_len);
163 if (xprt->xp_ltaddr.buf == NULL) {
164 warnx("svc_vc_create: no mem for local addr");
165 goto cleanup_svc_vc_create;
166 }
167 memcpy(xprt->xp_ltaddr.buf, &sslocal, (size_t)sslocal.ss_len);
168
169 xprt->xp_rtaddr.maxlen = sizeof (struct sockaddr_storage);
170 xprt_register(xprt);
171 return (xprt);
172cleanup_svc_vc_create:
173 if (r != NULL)
174 mem_free(r, sizeof(*r));
175 return (NULL);
176}
177
178/*
179 * Like svtcp_create(), except the routine takes any *open* UNIX file
180 * descriptor as its first input.
181 */
182SVCXPRT *
183svc_fd_create(fd, sendsize, recvsize)
184 int fd;
185 u_int sendsize;
186 u_int recvsize;
187{
188 struct sockaddr_storage ss;
189 socklen_t slen;
190 SVCXPRT *ret;
191
192 assert(fd != -1);
193
194 ret = makefd_xprt(fd, sendsize, recvsize);
195 if (ret == NULL)
196 return NULL;
197
198 slen = sizeof (struct sockaddr_storage);
199 if (_getsockname(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) {
200 warnx("svc_fd_create: could not retrieve local addr");
201 goto freedata;
202 }
203 ret->xp_ltaddr.maxlen = ret->xp_ltaddr.len = ss.ss_len;
204 ret->xp_ltaddr.buf = mem_alloc((size_t)ss.ss_len);
205 if (ret->xp_ltaddr.buf == NULL) {
206 warnx("svc_fd_create: no mem for local addr");
207 goto freedata;
208 }
209 memcpy(ret->xp_ltaddr.buf, &ss, (size_t)ss.ss_len);
210
211 slen = sizeof (struct sockaddr_storage);
212 if (_getpeername(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) {
213 warnx("svc_fd_create: could not retrieve remote addr");
214 goto freedata;
215 }
216 ret->xp_rtaddr.maxlen = ret->xp_rtaddr.len = ss.ss_len;
217 ret->xp_rtaddr.buf = mem_alloc((size_t)ss.ss_len);
218 if (ret->xp_rtaddr.buf == NULL) {
219 warnx("svc_fd_create: no mem for local addr");
220 goto freedata;
221 }
222 memcpy(ret->xp_rtaddr.buf, &ss, (size_t)ss.ss_len);
223#ifdef PORTMAP
224 if (ss.ss_family == AF_INET) {
225 ret->xp_raddr = *(struct sockaddr_in *)ret->xp_rtaddr.buf;
226 ret->xp_addrlen = sizeof (struct sockaddr_in);
227 }
228#endif /* PORTMAP */
229
230 return ret;
231
232freedata:
233 if (ret->xp_ltaddr.buf != NULL)
234 mem_free(ret->xp_ltaddr.buf, rep->xp_ltaddr.maxlen);
235
236 return NULL;
237}
238
239static SVCXPRT *
240makefd_xprt(fd, sendsize, recvsize)
241 int fd;
242 u_int sendsize;
243 u_int recvsize;
244{
245 SVCXPRT *xprt;
246 struct cf_conn *cd;
247 const char *netid;
248 struct __rpc_sockinfo si;
249
250 assert(fd != -1);
251
252 xprt = mem_alloc(sizeof(SVCXPRT));
253 if (xprt == NULL) {
254 warnx("svc_vc: makefd_xprt: out of memory");
255 goto done;
256 }
257 memset(xprt, 0, sizeof *xprt);
258 cd = mem_alloc(sizeof(struct cf_conn));
259 if (cd == NULL) {
260 warnx("svc_tcp: makefd_xprt: out of memory");
261 mem_free(xprt, sizeof(SVCXPRT));
262 xprt = NULL;
263 goto done;
264 }
265 cd->strm_stat = XPRT_IDLE;
266 xdrrec_create(&(cd->xdrs), sendsize, recvsize,
267 (caddr_t)(void *)xprt, read_vc, write_vc);
268 xprt->xp_p1 = (caddr_t)(void *)cd;
269 xprt->xp_verf.oa_base = cd->verf_body;
270 svc_vc_ops(xprt); /* truely deals with calls */
271 xprt->xp_port = 0; /* this is a connection, not a rendezvouser */
272 xprt->xp_fd = fd;
273 if (__rpc_fd2sockinfo(fd, &si) && __rpc_sockinfo2netid(&si, &netid))
274 xprt->xp_netid = strdup(netid);
275
276 xprt_register(xprt);
277done:
278 return (xprt);
279}
280
281/*ARGSUSED*/
282static bool_t
283rendezvous_request(xprt, msg)
284 SVCXPRT *xprt;
285 struct rpc_msg *msg;
286{
287 int sock;
288 struct cf_rendezvous *r;
289 struct sockaddr_storage addr;
290 socklen_t len;
291 struct __rpc_sockinfo si;
292
293 assert(xprt != NULL);
294 assert(msg != NULL);
295
296 r = (struct cf_rendezvous *)xprt->xp_p1;
297again:
298 len = sizeof addr;
299 if ((sock = _accept(xprt->xp_fd, (struct sockaddr *)(void *)&addr,
300 &len)) < 0) {
301 if (errno == EINTR)
302 goto again;
303 return (FALSE);
304 }
305 /*
306 * make a new transporter (re-uses xprt)
307 */
308 xprt = makefd_xprt(sock, r->sendsize, r->recvsize);
309 xprt->xp_rtaddr.buf = mem_alloc(len);
310 if (xprt->xp_rtaddr.buf == NULL)
311 return (FALSE);
312 memcpy(xprt->xp_rtaddr.buf, &addr, len);
313 xprt->xp_rtaddr.len = len;
314#ifdef PORTMAP
315 if (addr.ss_family == AF_INET) {
316 xprt->xp_raddr = *(struct sockaddr_in *)xprt->xp_rtaddr.buf;
317 xprt->xp_addrlen = sizeof (struct sockaddr_in);
318 }
319#endif /* PORTMAP */
320 if (__rpc_fd2sockinfo(sock, &si) && si.si_proto == IPPROTO_TCP) {
321 len = 1;
322 /* XXX fvdl - is this useful? */
323 _setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &len, sizeof (len));
324 }
325 return (FALSE); /* there is never an rpc msg to be processed */
326}
327
328/*ARGSUSED*/
329static enum xprt_stat
330rendezvous_stat(xprt)
331 SVCXPRT *xprt;
332{
333
334 return (XPRT_IDLE);
335}
336
337static void
338svc_vc_destroy(xprt)
339 SVCXPRT *xprt;
340{
341 struct cf_conn *cd;
342 struct cf_rendezvous *r;
343
344 assert(xprt != NULL);
345
346 cd = (struct cf_conn *)xprt->xp_p1;
347
348 xprt_unregister(xprt);
349 if (xprt->xp_fd != RPC_ANYFD)
350 (void)_close(xprt->xp_fd);
351 if (xprt->xp_port != 0) {
352 /* a rendezvouser socket */
353 r = (struct cf_rendezvous *)xprt->xp_p1;
354 mem_free(r, sizeof (struct cf_rendezvous));
355 xprt->xp_port = 0;
356 } else {
357 /* an actual connection socket */
358 XDR_DESTROY(&(cd->xdrs));
359 mem_free(cd, sizeof(struct cf_conn));
360 }
361 if (xprt->xp_rtaddr.buf)
362 mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.maxlen);
363 if (xprt->xp_ltaddr.buf)
364 mem_free(xprt->xp_ltaddr.buf, xprt->xp_ltaddr.maxlen);
365 if (xprt->xp_tp)
366 free(xprt->xp_tp);
367 if (xprt->xp_netid)
368 free(xprt->xp_netid);
369 mem_free(xprt, sizeof(SVCXPRT));
370}
371
372/*ARGSUSED*/
373static bool_t
374svc_vc_control(xprt, rq, in)
375 SVCXPRT *xprt;
376 const u_int rq;
377 void *in;
378{
379 return (FALSE);
380}
381
382/*
383 * reads data from the tcp or uip connection.
384 * any error is fatal and the connection is closed.
385 * (And a read of zero bytes is a half closed stream => error.)
386 * All read operations timeout after 35 seconds. A timeout is
387 * fatal for the connection.
388 */
389static int
390read_vc(xprtp, buf, len)
391 caddr_t xprtp;
392 caddr_t buf;
393 int len;
394{
395 SVCXPRT *xprt;
396 int sock;
397 int milliseconds = 35 * 1000;
398 struct pollfd pollfd;
399 struct sockaddr *sa;
400 struct cmessage *cm;
401 struct cmsghdr *cmp;
402 struct sockcred *sc;
403
404 xprt = (SVCXPRT *)(void *)xprtp;
405 assert(xprt != NULL);
406
407 sock = xprt->xp_fd;
408
409 do {
410 pollfd.fd = sock;
411 pollfd.events = POLLIN;
412 pollfd.revents = 0;
413 switch (_poll(&pollfd, 1, milliseconds)) {
414 case -1:
415 if (errno == EINTR)
416 continue;
417 /*FALLTHROUGH*/
418 case 0:
419 goto fatal_err;
420
421 default:
422 break;
423 }
424 } while ((pollfd.revents & POLLIN) == 0);
425
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 cmp = &cm->cmsg;
431 sc = (struct sockcred *)(void *)CMSG_DATA(cmp);
432 xprt->xp_p2 = sc;
433 return (len);
434 }
435 } else {
436 if ((len = _read(sock, buf, (size_t)len)) > 0)
437 return (len);
438 }
439
440fatal_err:
441 ((struct cf_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;
442 return (-1);
443}
444
445/*
446 * writes data to the tcp connection.
447 * Any error is fatal and the connection is closed.
448 */
449static int
450write_vc(xprtp, buf, len)
451 caddr_t xprtp;
452 caddr_t buf;
453 int len;
454{
455 SVCXPRT *xprt;
456 int i, cnt;
457 struct sockaddr *sa;
458
459 xprt = (SVCXPRT *)(void *)xprtp;
460 assert(xprt != NULL);
461
462 sa = (struct sockaddr *)xprt->xp_rtaddr.buf;
463 if (sa->sa_family == AF_LOCAL) {
464 for (cnt = len; cnt > 0; cnt -= i, buf += i) {
465 if ((i = __msgwrite(xprt->xp_fd, buf,
466 (size_t)cnt)) < 0) {
467 ((struct cf_conn *)(xprt->xp_p1))->strm_stat =
468 XPRT_DIED;
469 return (-1);
470 }
471 }
472 } else {
473 for (cnt = len; cnt > 0; cnt -= i, buf += i) {
474 if ((i = _write(xprt->xp_fd, buf,
475 (size_t)cnt)) < 0) {
476 ((struct cf_conn *)(xprt->xp_p1))->strm_stat =
477 XPRT_DIED;
478 return (-1);
479 }
480 }
481 }
482
483 return (len);
484}
485
486static enum xprt_stat
487svc_vc_stat(xprt)
488 SVCXPRT *xprt;
489{
490 struct cf_conn *cd;
491
492 assert(xprt != NULL);
493
494 cd = (struct cf_conn *)(xprt->xp_p1);
495
496 if (cd->strm_stat == XPRT_DIED)
497 return (XPRT_DIED);
498 if (! xdrrec_eof(&(cd->xdrs)))
499 return (XPRT_MOREREQS);
500 return (XPRT_IDLE);
501}
502
503static bool_t
504svc_vc_recv(xprt, msg)
505 SVCXPRT *xprt;
506 struct rpc_msg *msg;
507{
508 struct cf_conn *cd;
509 XDR *xdrs;
510
511 assert(xprt != NULL);
512 assert(msg != NULL);
513
514 cd = (struct cf_conn *)(xprt->xp_p1);
515 xdrs = &(cd->xdrs);
516
517 xdrs->x_op = XDR_DECODE;
518 (void)xdrrec_skiprecord(xdrs);
519 if (xdr_callmsg(xdrs, msg)) {
520 cd->x_id = msg->rm_xid;
521 return (TRUE);
522 }
523 cd->strm_stat = XPRT_DIED;
524 return (FALSE);
525}
526
527static bool_t
528svc_vc_getargs(xprt, xdr_args, args_ptr)
529 SVCXPRT *xprt;
530 xdrproc_t xdr_args;
531 caddr_t args_ptr;
532{
533
534 assert(xprt != NULL);
535 /* args_ptr may be NULL */
536 return ((*xdr_args)(&(((struct cf_conn *)(xprt->xp_p1))->xdrs),
537 args_ptr));
538}
539
540static bool_t
541svc_vc_freeargs(xprt, xdr_args, args_ptr)
542 SVCXPRT *xprt;
543 xdrproc_t xdr_args;
544 caddr_t args_ptr;
545{
546 XDR *xdrs;
547
548 assert(xprt != NULL);
549 /* args_ptr may be NULL */
550
551 xdrs = &(((struct cf_conn *)(xprt->xp_p1))->xdrs);
552
553 xdrs->x_op = XDR_FREE;
554 return ((*xdr_args)(xdrs, args_ptr));
555}
556
557static bool_t
558svc_vc_reply(xprt, msg)
559 SVCXPRT *xprt;
560 struct rpc_msg *msg;
561{
562 struct cf_conn *cd;
563 XDR *xdrs;
564 bool_t stat;
565
566 assert(xprt != NULL);
567 assert(msg != NULL);
568
569 cd = (struct cf_conn *)(xprt->xp_p1);
570 xdrs = &(cd->xdrs);
571
572 xdrs->x_op = XDR_ENCODE;
573 msg->rm_xid = cd->x_id;
574 stat = xdr_replymsg(xdrs, msg);
575 (void)xdrrec_endofrecord(xdrs, TRUE);
576 return (stat);
577}
578
579static void
580svc_vc_ops(xprt)
581 SVCXPRT *xprt;
582{
583 static struct xp_ops ops;
584 static struct xp_ops2 ops2;
585 extern mutex_t ops_lock;
586
587/* VARIABLES PROTECTED BY ops_lock: ops, ops2 */
588
589 mutex_lock(&ops_lock);
590 if (ops.xp_recv == NULL) {
591 ops.xp_recv = svc_vc_recv;
592 ops.xp_stat = svc_vc_stat;
593 ops.xp_getargs = svc_vc_getargs;
594 ops.xp_reply = svc_vc_reply;
595 ops.xp_freeargs = svc_vc_freeargs;
596 ops.xp_destroy = svc_vc_destroy;
597 ops2.xp_control = svc_vc_control;
598 }
599 xprt->xp_ops = &ops;
600 xprt->xp_ops2 = &ops2;
601 mutex_unlock(&ops_lock);
602}
603
604static void
605svc_vc_rendezvous_ops(xprt)
606 SVCXPRT *xprt;
607{
608 static struct xp_ops ops;
609 static struct xp_ops2 ops2;
610 extern mutex_t ops_lock;
611
612 mutex_lock(&ops_lock);
613 if (ops.xp_recv == NULL) {
614 ops.xp_recv = rendezvous_request;
615 ops.xp_stat = rendezvous_stat;
616 ops.xp_getargs =
617 (bool_t (*) __P((SVCXPRT *, xdrproc_t, caddr_t)))abort;
618 ops.xp_reply =
619 (bool_t (*) __P((SVCXPRT *, struct rpc_msg *)))abort;
620 ops.xp_freeargs =
621 (bool_t (*) __P((SVCXPRT *, xdrproc_t, caddr_t)))abort,
622 ops.xp_destroy = svc_vc_destroy;
623 ops2.xp_control = svc_vc_control;
624 }
625 xprt->xp_ops = &ops;
626 xprt->xp_ops2 = &ops2;
627 mutex_unlock(&ops_lock);
628}
629
630int
631__msgread_withcred(sock, buf, cnt, cmp)
632 int sock;
633 void *buf;
634 size_t cnt;
635 struct cmessage *cmp;
636{
637 struct iovec iov[1];
638 struct msghdr msg;
639
640 bzero(cmp, sizeof(*cmp));
641 iov[0].iov_base = buf;
642 iov[0].iov_len = cnt;
643
644 msg.msg_iov = iov;
645 msg.msg_iovlen = 1;
646 msg.msg_name = NULL;
647 msg.msg_namelen = 0;
648 msg.msg_control = cmp;
649 msg.msg_controllen = sizeof(struct cmessage);
650 msg.msg_flags = 0;
651
652 return(_recvmsg(sock, &msg, 0));
653}
654
655static int
656__msgwrite(sock, buf, cnt)
657 int sock;
658 void *buf;
659 size_t cnt;
660{
661 struct iovec iov[1];
662 struct msghdr msg;
663 struct cmessage cm;
664
665 bzero((char *)&cm, sizeof(cm));
666 iov[0].iov_base = buf;
667 iov[0].iov_len = cnt;
668
669 cm.cmsg.cmsg_type = SCM_CREDS;
670 cm.cmsg.cmsg_level = SOL_SOCKET;
671 cm.cmsg.cmsg_len = sizeof(struct cmessage);
672
673 msg.msg_iov = iov;
674 msg.msg_iovlen = 1;
675 msg.msg_name = NULL;
676 msg.msg_namelen = 0;
677 msg.msg_control = (caddr_t)&cm;
678 msg.msg_controllen = sizeof(struct cmessage);
679 msg.msg_flags = 0;
680
681 return(_sendmsg(sock, &msg, 0));
682}
683
684/*
685 * Get the effective UID of the sending process. Used by rpcbind and keyserv
686 * (AF_LOCAL).
687 */
688int
689__rpc_get_local_uid(SVCXPRT *transp, uid_t *uid)
690{
691 struct cmsgcred *cmcred;
692
693 cmcred = __svc_getcallercreds(transp);
694 if (cmcred == NULL)
695 return(-1);
696 *uid = cmcred->cmcred_euid;
697 return(0);
698}