1 /* $NetBSD: clnt_vc.c,v 1.4 2000/07/14 08:40:42 fvdl Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (c) 2009, Sun Microsystems, Inc.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
11 * - Redistributions of source code must retain the above copyright notice,
12 * this list of conditions and the following disclaimer.
13 * - Redistributions in binary form must reproduce the above copyright notice,
14 * this list of conditions and the following disclaimer in the documentation
15 * and/or other materials provided with the distribution.
16 * - Neither the name of Sun Microsystems, Inc. nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #if defined(LIBC_SCCS) && !defined(lint)
34 static char *sccsid2 = "@(#)clnt_tcp.c 1.37 87/10/05 Copyr 1984 Sun Micro";
35 static char *sccsid = "@(#)clnt_tcp.c 2.2 88/08/01 4.0 RPCSRC";
36 static char sccsid3[] = "@(#)clnt_vc.c 1.19 89/03/16 Copyr 1988 Sun Micro";
37 #endif
38 /*
39 * clnt_tcp.c, Implements a TCP/IP based, client side RPC.
40 *
41 * Copyright (C) 1984, Sun Microsystems, Inc.
42 *
43 * TCP based RPC supports 'batched calls'.
44 * A sequence of calls may be batched-up in a send buffer. The rpc call
45 * return immediately to the client even though the call was not necessarily
46 * sent. The batching occurs if the results' xdr routine is NULL (0) AND
47 * the rpc timeout value is zero (see clnt.h, rpc).
48 *
49 * Clients should NOT casually batch calls that in fact return results; that is,
50 * the server side should be aware that a call is batched and not produce any
51 * return message. Batched calls that produce many result messages can
52 * deadlock (netlock) the client and the server....
53 *
54 * Now go hang yourself.
55 */
56
57 #include "namespace.h"
58 #include "reentrant.h"
59 #include <sys/types.h>
60 #include <sys/poll.h>
61 #include <sys/syslog.h>
62 #include <sys/socket.h>
63 #include <sys/tree.h>
64 #include <sys/un.h>
65 #include <sys/uio.h>
66
67 #include <arpa/inet.h>
68 #include <assert.h>
69 #include <err.h>
70 #include <errno.h>
71 #include <netdb.h>
72 #include <pthread.h>
73 #include <stdio.h>
74 #include <stdbool.h>
75 #include <stdlib.h>
76 #include <string.h>
77 #include <unistd.h>
78 #include <signal.h>
79
80 #include <rpc/rpc.h>
81 #include <rpc/rpcsec_gss.h>
82 #include "un-namespace.h"
83 #include "rpc_com.h"
84 #include "mt_misc.h"
85
86 #define MCALL_MSG_SIZE 24
87
88 struct cmessage {
89 struct cmsghdr cmsg;
90 struct cmsgcred cmcred;
91 };
92
93 static enum clnt_stat clnt_vc_call(CLIENT *, rpcproc_t, xdrproc_t, void *,
94 xdrproc_t, void *, struct timeval);
95 static void clnt_vc_geterr(CLIENT *, struct rpc_err *);
96 static bool_t clnt_vc_freeres(CLIENT *, xdrproc_t, void *);
97 static void clnt_vc_abort(CLIENT *);
98 static bool_t clnt_vc_control(CLIENT *, u_int, void *);
99 static void clnt_vc_destroy(CLIENT *);
100 static struct clnt_ops *clnt_vc_ops(void);
101 static bool_t time_not_ok(struct timeval *);
102 static int read_vc(void *, void *, int);
103 static int write_vc(void *, void *, int);
104 static int __msgwrite(int, void *, size_t);
105 static int __msgread(int, void *, size_t);
106
107 struct ct_data {
108 int ct_fd; /* connection's fd */
109 bool_t ct_closeit; /* close it on destroy */
110 struct timeval ct_wait; /* wait interval in milliseconds */
111 bool_t ct_waitset; /* wait set by clnt_control? */
112 struct netbuf ct_addr; /* remote addr */
113 struct rpc_err ct_error;
114 union {
115 char ct_mcallc[MCALL_MSG_SIZE]; /* marshalled callmsg */
116 u_int32_t ct_mcalli;
117 } ct_u;
118 u_int ct_mpos; /* pos after marshal */
119 XDR ct_xdrs; /* XDR stream */
120 };
121
122 /*
123 * This machinery implements per-fd locks for MT-safety. It is not
124 * sufficient to do per-CLIENT handle locks for MT-safety because a
125 * user may create more than one CLIENT handle with the same fd behind
126 * it. Therefore, we allocate an associative array of flags and condition
127 * variables (vc_fd). The flags and the array are protected by the
128 * clnt_fd_lock mutex. vc_fd_lock[fd] == 1 => a call is active on some
129 * CLIENT handle created for that fd. The current implementation holds
130 * locks across the entire RPC and reply. Yes, this is silly, and as soon
131 * as this code is proven to work, this should be the first thing fixed.
132 * One step at a time.
133 */
134 struct vc_fd {
135 RB_ENTRY(vc_fd) vc_link;
136 int fd;
137 mutex_t mtx;
138 };
139 static inline int
cmp_vc_fd(struct vc_fd * a,struct vc_fd * b)140 cmp_vc_fd(struct vc_fd *a, struct vc_fd *b)
141 {
142 if (a->fd > b->fd) {
143 return (1);
144 } else if (a->fd < b->fd) {
145 return (-1);
146 } else {
147 return (0);
148 }
149 }
150 RB_HEAD(vc_fd_list, vc_fd);
151 RB_PROTOTYPE(vc_fd_list, vc_fd, vc_link, cmp_vc_fd);
152 RB_GENERATE(vc_fd_list, vc_fd, vc_link, cmp_vc_fd);
153 struct vc_fd_list vc_fd_head = RB_INITIALIZER(&vc_fd_head);
154
155 /*
156 * Find the lock structure for the given file descriptor, or initialize it if
157 * it does not already exist. The clnt_fd_lock mutex must be held.
158 */
159 static struct vc_fd *
vc_fd_find(int fd)160 vc_fd_find(int fd)
161 {
162 struct vc_fd key, *elem;
163
164 key.fd = fd;
165 elem = RB_FIND(vc_fd_list, &vc_fd_head, &key);
166 if (elem == NULL) {
167 elem = calloc(1, sizeof(*elem));
168 elem->fd = fd;
169 mutex_init(&elem->mtx, NULL);
170 RB_INSERT(vc_fd_list, &vc_fd_head, elem);
171 }
172 return (elem);
173 }
174
175 static void
release_fd_lock(struct vc_fd * elem,sigset_t mask)176 release_fd_lock(struct vc_fd *elem, sigset_t mask)
177 {
178 mutex_unlock(&elem->mtx);
179 thr_sigsetmask(SIG_SETMASK, &mask, NULL);
180 }
181
182 static const char clnt_vc_errstr[] = "%s : %s";
183 static const char clnt_vc_str[] = "clnt_vc_create";
184 static const char __no_mem_str[] = "out of memory";
185
186 /*
187 * Create a client handle for a connection.
188 * Default options are set, which the user can change using clnt_control()'s.
189 * The rpc/vc package does buffering similar to stdio, so the client
190 * must pick send and receive buffer sizes, 0 => use the default.
191 * NB: fd is copied into a private area.
192 * NB: The rpch->cl_auth is set null authentication. Caller may wish to
193 * set this something more useful.
194 *
195 * fd should be an open socket
196 *
197 * fd - open file descriptor
198 * raddr - servers address
199 * prog - program number
200 * vers - version number
201 * sendsz - buffer send size
202 * recvsz - buffer recv size
203 */
204 CLIENT *
clnt_vc_create(int fd,const struct netbuf * raddr,const rpcprog_t prog,const rpcvers_t vers,u_int sendsz,u_int recvsz)205 clnt_vc_create(int fd, const struct netbuf *raddr, const rpcprog_t prog,
206 const rpcvers_t vers, u_int sendsz, u_int recvsz)
207 {
208 CLIENT *cl; /* client handle */
209 struct ct_data *ct = NULL; /* client handle */
210 struct timeval now;
211 struct rpc_msg call_msg;
212 static u_int32_t disrupt;
213 struct sockaddr_storage ss;
214 socklen_t slen;
215 struct __rpc_sockinfo si;
216
217 if (disrupt == 0)
218 disrupt = (u_int32_t)(long)raddr;
219
220 cl = (CLIENT *)mem_alloc(sizeof (*cl));
221 ct = (struct ct_data *)mem_alloc(sizeof (*ct));
222 if ((cl == (CLIENT *)NULL) || (ct == (struct ct_data *)NULL)) {
223 (void) syslog(LOG_ERR, clnt_vc_errstr,
224 clnt_vc_str, __no_mem_str);
225 rpc_createerr.cf_stat = RPC_SYSTEMERROR;
226 rpc_createerr.cf_error.re_errno = errno;
227 goto err;
228 }
229 ct->ct_addr.buf = NULL;
230
231 /*
232 * XXX - fvdl connecting while holding a mutex?
233 */
234 slen = sizeof ss;
235 if (_getpeername(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) {
236 if (errno != ENOTCONN) {
237 rpc_createerr.cf_stat = RPC_SYSTEMERROR;
238 rpc_createerr.cf_error.re_errno = errno;
239 mutex_unlock(&clnt_fd_lock);
240 goto err;
241 }
242 if (_connect(fd, (struct sockaddr *)raddr->buf, raddr->len) < 0){
243 rpc_createerr.cf_stat = RPC_SYSTEMERROR;
244 rpc_createerr.cf_error.re_errno = errno;
245 mutex_unlock(&clnt_fd_lock);
246 goto err;
247 }
248 }
249 mutex_unlock(&clnt_fd_lock);
250 if (!__rpc_fd2sockinfo(fd, &si))
251 goto err;
252
253 ct->ct_closeit = FALSE;
254
255 /*
256 * Set up private data struct
257 */
258 ct->ct_fd = fd;
259 ct->ct_wait.tv_usec = 0;
260 ct->ct_waitset = FALSE;
261 ct->ct_addr.buf = malloc(raddr->maxlen);
262 if (ct->ct_addr.buf == NULL)
263 goto err;
264 memcpy(ct->ct_addr.buf, raddr->buf, raddr->len);
265 ct->ct_addr.len = raddr->len;
266 ct->ct_addr.maxlen = raddr->maxlen;
267
268 /*
269 * Initialize call message
270 */
271 (void)gettimeofday(&now, NULL);
272 call_msg.rm_xid = ((u_int32_t)++disrupt) ^ __RPC_GETXID(&now);
273 call_msg.rm_direction = CALL;
274 call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
275 call_msg.rm_call.cb_prog = (u_int32_t)prog;
276 call_msg.rm_call.cb_vers = (u_int32_t)vers;
277
278 /*
279 * pre-serialize the static part of the call msg and stash it away
280 */
281 xdrmem_create(&(ct->ct_xdrs), ct->ct_u.ct_mcallc, MCALL_MSG_SIZE,
282 XDR_ENCODE);
283 if (! xdr_callhdr(&(ct->ct_xdrs), &call_msg)) {
284 if (ct->ct_closeit) {
285 (void)_close(fd);
286 }
287 goto err;
288 }
289 ct->ct_mpos = XDR_GETPOS(&(ct->ct_xdrs));
290 XDR_DESTROY(&(ct->ct_xdrs));
291 assert(ct->ct_mpos + sizeof(uint32_t) <= MCALL_MSG_SIZE);
292
293 /*
294 * Create a client handle which uses xdrrec for serialization
295 * and authnone for authentication.
296 */
297 cl->cl_ops = clnt_vc_ops();
298 cl->cl_private = ct;
299 cl->cl_auth = authnone_create();
300 sendsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsz);
301 recvsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsz);
302 xdrrec_create(&(ct->ct_xdrs), sendsz, recvsz,
303 cl->cl_private, read_vc, write_vc);
304 return (cl);
305
306 err:
307 if (ct) {
308 if (ct->ct_addr.len)
309 mem_free(ct->ct_addr.buf, ct->ct_addr.len);
310 mem_free(ct, sizeof (struct ct_data));
311 }
312 if (cl)
313 mem_free(cl, sizeof (CLIENT));
314 return ((CLIENT *)NULL);
315 }
316
317 static enum clnt_stat
clnt_vc_call(CLIENT * cl,rpcproc_t proc,xdrproc_t xdr_args,void * args_ptr,xdrproc_t xdr_results,void * results_ptr,struct timeval timeout)318 clnt_vc_call(CLIENT *cl, rpcproc_t proc, xdrproc_t xdr_args, void *args_ptr,
319 xdrproc_t xdr_results, void *results_ptr, struct timeval timeout)
320 {
321 struct ct_data *ct = (struct ct_data *) cl->cl_private;
322 XDR *xdrs = &(ct->ct_xdrs);
323 struct rpc_msg reply_msg;
324 struct vc_fd *elem;
325 u_int32_t x_id;
326 u_int32_t *msg_x_id = &ct->ct_u.ct_mcalli; /* yuk */
327 bool_t shipnow;
328 int refreshes = 2;
329 sigset_t mask, newmask;
330 bool_t reply_stat;
331
332 assert(cl != NULL);
333
334 sigfillset(&newmask);
335 thr_sigsetmask(SIG_SETMASK, &newmask, &mask);
336 mutex_lock(&clnt_fd_lock);
337 elem = vc_fd_find(ct->ct_fd);
338 mutex_unlock(&clnt_fd_lock);
339 mutex_lock(&elem->mtx);
340 if (!ct->ct_waitset) {
341 /* If time is not within limits, we ignore it. */
342 if (time_not_ok(&timeout) == FALSE)
343 ct->ct_wait = timeout;
344 }
345
346 shipnow =
347 (xdr_results == NULL && timeout.tv_sec == 0
348 && timeout.tv_usec == 0) ? FALSE : TRUE;
349
350 call_again:
351 xdrs->x_op = XDR_ENCODE;
352 ct->ct_error.re_status = RPC_SUCCESS;
353 x_id = ntohl(--(*msg_x_id));
354
355 if (cl->cl_auth->ah_cred.oa_flavor != RPCSEC_GSS) {
356 if ((! XDR_PUTBYTES(xdrs, ct->ct_u.ct_mcallc, ct->ct_mpos)) ||
357 (! XDR_PUTINT32(xdrs, &proc)) ||
358 (! AUTH_MARSHALL(cl->cl_auth, xdrs)) ||
359 (! (*xdr_args)(xdrs, args_ptr))) {
360 if (ct->ct_error.re_status == RPC_SUCCESS)
361 ct->ct_error.re_status = RPC_CANTENCODEARGS;
362 (void)xdrrec_endofrecord(xdrs, TRUE);
363 release_fd_lock(elem, mask);
364 return (ct->ct_error.re_status);
365 }
366 } else {
367 *(uint32_t *) &ct->ct_u.ct_mcallc[ct->ct_mpos] = htonl(proc);
368 if (! __rpc_gss_wrap(cl->cl_auth, ct->ct_u.ct_mcallc,
369 ct->ct_mpos + sizeof(uint32_t),
370 xdrs, xdr_args, args_ptr)) {
371 if (ct->ct_error.re_status == RPC_SUCCESS)
372 ct->ct_error.re_status = RPC_CANTENCODEARGS;
373 (void)xdrrec_endofrecord(xdrs, TRUE);
374 release_fd_lock(elem, mask);
375 return (ct->ct_error.re_status);
376 }
377 }
378 if (! xdrrec_endofrecord(xdrs, shipnow)) {
379 release_fd_lock(elem, mask);
380 return (ct->ct_error.re_status = RPC_CANTSEND);
381 }
382 if (! shipnow) {
383 release_fd_lock(elem, mask);
384 return (RPC_SUCCESS);
385 }
386 /*
387 * Hack to provide rpc-based message passing
388 */
389 if (timeout.tv_sec == 0 && timeout.tv_usec == 0) {
390 release_fd_lock(elem, mask);
391 return(ct->ct_error.re_status = RPC_TIMEDOUT);
392 }
393
394
395 /*
396 * Keep receiving until we get a valid transaction id
397 */
398 xdrs->x_op = XDR_DECODE;
399 while (TRUE) {
400 reply_msg.acpted_rply.ar_verf = _null_auth;
401 reply_msg.acpted_rply.ar_results.where = NULL;
402 reply_msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void;
403 if (! xdrrec_skiprecord(xdrs)) {
404 release_fd_lock(elem, mask);
405 return (ct->ct_error.re_status);
406 }
407 /* now decode and validate the response header */
408 if (! xdr_replymsg(xdrs, &reply_msg)) {
409 if (ct->ct_error.re_status == RPC_SUCCESS)
410 continue;
411 release_fd_lock(elem, mask);
412 return (ct->ct_error.re_status);
413 }
414 if (reply_msg.rm_xid == x_id)
415 break;
416 }
417
418 /*
419 * process header
420 */
421 _seterr_reply(&reply_msg, &(ct->ct_error));
422 if (ct->ct_error.re_status == RPC_SUCCESS) {
423 if (! AUTH_VALIDATE(cl->cl_auth,
424 &reply_msg.acpted_rply.ar_verf)) {
425 ct->ct_error.re_status = RPC_AUTHERROR;
426 ct->ct_error.re_why = AUTH_INVALIDRESP;
427 } else {
428 if (cl->cl_auth->ah_cred.oa_flavor != RPCSEC_GSS) {
429 reply_stat = (*xdr_results)(xdrs, results_ptr);
430 } else {
431 reply_stat = __rpc_gss_unwrap(cl->cl_auth,
432 xdrs, xdr_results, results_ptr);
433 }
434 if (! reply_stat) {
435 if (ct->ct_error.re_status == RPC_SUCCESS)
436 ct->ct_error.re_status =
437 RPC_CANTDECODERES;
438 }
439 }
440 /* free verifier ... */
441 if (reply_msg.acpted_rply.ar_verf.oa_base != NULL) {
442 xdrs->x_op = XDR_FREE;
443 (void)xdr_opaque_auth(xdrs,
444 &(reply_msg.acpted_rply.ar_verf));
445 }
446 } /* end successful completion */
447 else {
448 /* maybe our credentials need to be refreshed ... */
449 if (refreshes-- && AUTH_REFRESH(cl->cl_auth, &reply_msg))
450 goto call_again;
451 } /* end of unsuccessful completion */
452 release_fd_lock(elem, mask);
453 return (ct->ct_error.re_status);
454 }
455
456 static void
clnt_vc_geterr(CLIENT * cl,struct rpc_err * errp)457 clnt_vc_geterr(CLIENT *cl, struct rpc_err *errp)
458 {
459 struct ct_data *ct;
460
461 assert(cl != NULL);
462 assert(errp != NULL);
463
464 ct = (struct ct_data *) cl->cl_private;
465 *errp = ct->ct_error;
466 }
467
468 static bool_t
clnt_vc_freeres(CLIENT * cl,xdrproc_t xdr_res,void * res_ptr)469 clnt_vc_freeres(CLIENT *cl, xdrproc_t xdr_res, void *res_ptr)
470 {
471 struct ct_data *ct;
472 struct vc_fd *elem;
473 XDR *xdrs;
474 bool_t dummy;
475 sigset_t mask;
476 sigset_t newmask;
477
478 assert(cl != NULL);
479
480 ct = (struct ct_data *)cl->cl_private;
481 xdrs = &(ct->ct_xdrs);
482
483 sigfillset(&newmask);
484 thr_sigsetmask(SIG_SETMASK, &newmask, &mask);
485 mutex_lock(&clnt_fd_lock);
486 elem = vc_fd_find(ct->ct_fd);
487 mutex_lock(&elem->mtx);
488 xdrs->x_op = XDR_FREE;
489 dummy = (*xdr_res)(xdrs, res_ptr);
490
491 mutex_unlock(&clnt_fd_lock);
492 release_fd_lock(elem, mask);
493 return dummy;
494 }
495
496 /*ARGSUSED*/
497 static void
clnt_vc_abort(CLIENT * cl)498 clnt_vc_abort(CLIENT *cl)
499 {
500 }
501
502 static __inline void
htonlp(void * dst,const void * src,uint32_t incr)503 htonlp(void *dst, const void *src, uint32_t incr)
504 {
505 /* We are aligned, so we think */
506 *(uint32_t *)dst = htonl(*(const uint32_t *)src + incr);
507 }
508
509 static __inline void
ntohlp(void * dst,const void * src)510 ntohlp(void *dst, const void *src)
511 {
512 /* We are aligned, so we think */
513 *(uint32_t *)dst = htonl(*(const uint32_t *)src);
514 }
515
516 static bool_t
clnt_vc_control(CLIENT * cl,u_int request,void * info)517 clnt_vc_control(CLIENT *cl, u_int request, void *info)
518 {
519 struct ct_data *ct;
520 struct vc_fd *elem;
521 void *infop = info;
522 sigset_t mask;
523 sigset_t newmask;
524
525 assert(cl != NULL);
526
527 ct = (struct ct_data *)cl->cl_private;
528
529 sigfillset(&newmask);
530 thr_sigsetmask(SIG_SETMASK, &newmask, &mask);
531 mutex_lock(&clnt_fd_lock);
532 elem = vc_fd_find(ct->ct_fd);
533 mutex_unlock(&clnt_fd_lock);
534 mutex_lock(&elem->mtx);
535
536 switch (request) {
537 case CLSET_FD_CLOSE:
538 ct->ct_closeit = TRUE;
539 release_fd_lock(elem, mask);
540 return (TRUE);
541 case CLSET_FD_NCLOSE:
542 ct->ct_closeit = FALSE;
543 release_fd_lock(elem, mask);
544 return (TRUE);
545 default:
546 break;
547 }
548
549 /* for other requests which use info */
550 if (info == NULL) {
551 release_fd_lock(elem, mask);
552 return (FALSE);
553 }
554 switch (request) {
555 case CLSET_TIMEOUT:
556 if (time_not_ok((struct timeval *)info)) {
557 release_fd_lock(elem, mask);
558 return (FALSE);
559 }
560 ct->ct_wait = *(struct timeval *)infop;
561 ct->ct_waitset = TRUE;
562 break;
563 case CLGET_TIMEOUT:
564 *(struct timeval *)infop = ct->ct_wait;
565 break;
566 case CLGET_SERVER_ADDR:
567 (void) memcpy(info, ct->ct_addr.buf, (size_t)ct->ct_addr.len);
568 break;
569 case CLGET_FD:
570 *(int *)info = ct->ct_fd;
571 break;
572 case CLGET_SVC_ADDR:
573 /* The caller should not free this memory area */
574 *(struct netbuf *)info = ct->ct_addr;
575 break;
576 case CLSET_SVC_ADDR: /* set to new address */
577 release_fd_lock(elem, mask);
578 return (FALSE);
579 case CLGET_XID:
580 /*
581 * use the knowledge that xid is the
582 * first element in the call structure
583 * This will get the xid of the PREVIOUS call
584 */
585 ntohlp(info, &ct->ct_u.ct_mcalli);
586 break;
587 case CLSET_XID:
588 /* This will set the xid of the NEXT call */
589 /* increment by 1 as clnt_vc_call() decrements once */
590 htonlp(&ct->ct_u.ct_mcalli, info, 1);
591 break;
592 case CLGET_VERS:
593 /*
594 * This RELIES on the information that, in the call body,
595 * the version number field is the fifth field from the
596 * beginning of the RPC header. MUST be changed if the
597 * call_struct is changed
598 */
599 ntohlp(info, ct->ct_u.ct_mcallc + 4 * BYTES_PER_XDR_UNIT);
600 break;
601
602 case CLSET_VERS:
603 htonlp(ct->ct_u.ct_mcallc + 4 * BYTES_PER_XDR_UNIT, info, 0);
604 break;
605
606 case CLGET_PROG:
607 /*
608 * This RELIES on the information that, in the call body,
609 * the program number field is the fourth field from the
610 * beginning of the RPC header. MUST be changed if the
611 * call_struct is changed
612 */
613 ntohlp(info, ct->ct_u.ct_mcallc + 3 * BYTES_PER_XDR_UNIT);
614 break;
615
616 case CLSET_PROG:
617 htonlp(ct->ct_u.ct_mcallc + 3 * BYTES_PER_XDR_UNIT, info, 0);
618 break;
619
620 default:
621 release_fd_lock(elem, mask);
622 return (FALSE);
623 }
624 release_fd_lock(elem, mask);
625 return (TRUE);
626 }
627
628
629 static void
clnt_vc_destroy(CLIENT * cl)630 clnt_vc_destroy(CLIENT *cl)
631 {
632 struct ct_data *ct = (struct ct_data *) cl->cl_private;
633 struct vc_fd *elem;
634 int ct_fd = ct->ct_fd;
635 sigset_t mask;
636 sigset_t newmask;
637
638 assert(cl != NULL);
639
640 ct = (struct ct_data *) cl->cl_private;
641
642 sigfillset(&newmask);
643 thr_sigsetmask(SIG_SETMASK, &newmask, &mask);
644 mutex_lock(&clnt_fd_lock);
645 elem = vc_fd_find(ct_fd);
646 mutex_lock(&elem->mtx);
647 if (ct->ct_closeit && ct->ct_fd != -1) {
648 (void)_close(ct->ct_fd);
649 }
650 XDR_DESTROY(&(ct->ct_xdrs));
651 free(ct->ct_addr.buf);
652 mem_free(ct, sizeof(struct ct_data));
653 if (cl->cl_netid && cl->cl_netid[0])
654 mem_free(cl->cl_netid, strlen(cl->cl_netid) +1);
655 if (cl->cl_tp && cl->cl_tp[0])
656 mem_free(cl->cl_tp, strlen(cl->cl_tp) +1);
657 mem_free(cl, sizeof(CLIENT));
658 mutex_unlock(&clnt_fd_lock);
659 release_fd_lock(elem, mask);
660 }
661
662 /*
663 * Interface between xdr serializer and tcp connection.
664 * Behaves like the system calls, read & write, but keeps some error state
665 * around for the rpc level.
666 */
667 static int
read_vc(void * ctp,void * buf,int len)668 read_vc(void *ctp, void *buf, int len)
669 {
670 struct sockaddr sa;
671 socklen_t sal;
672 struct ct_data *ct = (struct ct_data *)ctp;
673 struct pollfd fd;
674 int milliseconds = (int)((ct->ct_wait.tv_sec * 1000) +
675 (ct->ct_wait.tv_usec / 1000));
676
677 if (len == 0)
678 return (0);
679 fd.fd = ct->ct_fd;
680 fd.events = POLLIN;
681 for (;;) {
682 switch (_poll(&fd, 1, milliseconds)) {
683 case 0:
684 ct->ct_error.re_status = RPC_TIMEDOUT;
685 return (-1);
686
687 case -1:
688 if (errno == EINTR)
689 continue;
690 ct->ct_error.re_status = RPC_CANTRECV;
691 ct->ct_error.re_errno = errno;
692 return (-1);
693 }
694 break;
695 }
696
697 sal = sizeof(sa);
698 if ((_getpeername(ct->ct_fd, &sa, &sal) == 0) &&
699 (sa.sa_family == AF_LOCAL)) {
700 len = __msgread(ct->ct_fd, buf, (size_t)len);
701 } else {
702 len = _read(ct->ct_fd, buf, (size_t)len);
703 }
704
705 switch (len) {
706 case 0:
707 /* premature eof */
708 ct->ct_error.re_errno = ECONNRESET;
709 ct->ct_error.re_status = RPC_CANTRECV;
710 len = -1; /* it's really an error */
711 break;
712
713 case -1:
714 ct->ct_error.re_errno = errno;
715 ct->ct_error.re_status = RPC_CANTRECV;
716 break;
717 }
718 return (len);
719 }
720
721 static int
write_vc(void * ctp,void * buf,int len)722 write_vc(void *ctp, void *buf, int len)
723 {
724 struct sockaddr sa;
725 socklen_t sal;
726 struct ct_data *ct = (struct ct_data *)ctp;
727 int i, cnt;
728
729 sal = sizeof(sa);
730 if ((_getpeername(ct->ct_fd, &sa, &sal) == 0) &&
731 (sa.sa_family == AF_LOCAL)) {
732 for (cnt = len; cnt > 0; cnt -= i, buf = (char *)buf + i) {
733 if ((i = __msgwrite(ct->ct_fd, buf,
734 (size_t)cnt)) == -1) {
735 ct->ct_error.re_errno = errno;
736 ct->ct_error.re_status = RPC_CANTSEND;
737 return (-1);
738 }
739 }
740 } else {
741 for (cnt = len; cnt > 0; cnt -= i, buf = (char *)buf + i) {
742 if ((i = _write(ct->ct_fd, buf, (size_t)cnt)) == -1) {
743 ct->ct_error.re_errno = errno;
744 ct->ct_error.re_status = RPC_CANTSEND;
745 return (-1);
746 }
747 }
748 }
749 return (len);
750 }
751
752 static struct clnt_ops *
clnt_vc_ops(void)753 clnt_vc_ops(void)
754 {
755 static struct clnt_ops ops;
756 sigset_t mask, newmask;
757
758 /* VARIABLES PROTECTED BY ops_lock: ops */
759
760 sigfillset(&newmask);
761 thr_sigsetmask(SIG_SETMASK, &newmask, &mask);
762 mutex_lock(&ops_lock);
763 if (ops.cl_call == NULL) {
764 ops.cl_call = clnt_vc_call;
765 ops.cl_abort = clnt_vc_abort;
766 ops.cl_geterr = clnt_vc_geterr;
767 ops.cl_freeres = clnt_vc_freeres;
768 ops.cl_destroy = clnt_vc_destroy;
769 ops.cl_control = clnt_vc_control;
770 }
771 mutex_unlock(&ops_lock);
772 thr_sigsetmask(SIG_SETMASK, &(mask), NULL);
773 return (&ops);
774 }
775
776 /*
777 * Make sure that the time is not garbage. -1 value is disallowed.
778 * Note this is different from time_not_ok in clnt_dg.c
779 */
780 static bool_t
time_not_ok(struct timeval * t)781 time_not_ok(struct timeval *t)
782 {
783 return (t->tv_sec <= -1 || t->tv_sec > 100000000 ||
784 t->tv_usec <= -1 || t->tv_usec > 1000000);
785 }
786
787 static int
__msgread(int sock,void * buf,size_t cnt)788 __msgread(int sock, void *buf, size_t cnt)
789 {
790 struct iovec iov[1];
791 struct msghdr msg;
792 union {
793 struct cmsghdr cmsg;
794 char control[CMSG_SPACE(sizeof(struct cmsgcred))];
795 } cm;
796
797 bzero((char *)&cm, sizeof(cm));
798 iov[0].iov_base = buf;
799 iov[0].iov_len = cnt;
800
801 msg.msg_iov = iov;
802 msg.msg_iovlen = 1;
803 msg.msg_name = NULL;
804 msg.msg_namelen = 0;
805 msg.msg_control = (caddr_t)&cm;
806 msg.msg_controllen = CMSG_SPACE(sizeof(struct cmsgcred));
807 msg.msg_flags = 0;
808
809 return(_recvmsg(sock, &msg, 0));
810 }
811
812 static int
__msgwrite(int sock,void * buf,size_t cnt)813 __msgwrite(int sock, void *buf, size_t cnt)
814 {
815 struct iovec iov[1];
816 struct msghdr msg;
817 union {
818 struct cmsghdr cmsg;
819 char control[CMSG_SPACE(sizeof(struct cmsgcred))];
820 } cm;
821
822 bzero((char *)&cm, sizeof(cm));
823 iov[0].iov_base = buf;
824 iov[0].iov_len = cnt;
825
826 cm.cmsg.cmsg_type = SCM_CREDS;
827 cm.cmsg.cmsg_level = SOL_SOCKET;
828 cm.cmsg.cmsg_len = CMSG_LEN(sizeof(struct cmsgcred));
829
830 msg.msg_iov = iov;
831 msg.msg_iovlen = 1;
832 msg.msg_name = NULL;
833 msg.msg_namelen = 0;
834 msg.msg_control = (caddr_t)&cm;
835 msg.msg_controllen = CMSG_SPACE(sizeof(struct cmsgcred));
836 msg.msg_flags = 0;
837
838 return(_sendmsg(sock, &msg, 0));
839 }
840