lib/libc/rpc/clnt_vc.c

   1 /*
   2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3  * unrestricted use provided that this legend is included on all tape
   4  * media and as a part of the software program in whole or part.  Users
   5  * may copy or modify Sun RPC without charge, but are not authorized
   6  * to license or distribute it to anyone else except as part of a product or
   7  * program developed by the user.
   8  *
   9  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  10  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  11  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  12  *
  13  * Sun RPC is provided with no support and without any obligation on the
  14  * part of Sun Microsystems, Inc. to assist in its use, correction,
  15  * modification or enhancement.
  16  *
  17  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  18  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  19  * OR ANY PART THEREOF.
  20  *
  21  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  22  * or profits or other special, indirect and consequential damages, even if
  23  * Sun has been advised of the possibility of such damages.
  24  *
  25  * Sun Microsystems, Inc.
  26  * 2550 Garcia Avenue
  27  * Mountain View, California  94043
  28  * @(#)clnt_tcp.c 1.37 87/10/05 Copyr 1984 Sun Micro;   2.2 88/08/01 4.0 RPCSRC
  29  * @(#)clnt_vc.c 1.19 89/03/16 Copyr 1988 Sun Micro
  30  * $NetBSD: clnt_vc.c,v 1.4 2000/07/14 08:40:42 fvdl Exp $
  31  * $FreeBSD: src/lib/libc/rpc/clnt_vc.c,v 1.20 2006/09/09 22:18:57 mbr Exp $
  32  * $DragonFly$
  33  */
  34
  35 /*
  36  * clnt_tcp.c, Implements a TCP/IP based, client side RPC.
  37  *
  38  * Copyright (C) 1984, Sun Microsystems, Inc.
  39  *
  40  * TCP based RPC supports 'batched calls'.
  41  * A sequence of calls may be batched-up in a send buffer.  The rpc call
  42  * return immediately to the client even though the call was not necessarily
  43  * sent.  The batching occurs if the results' xdr routine is NULL (0) AND
  44  * the rpc timeout value is zero (see clnt.h, rpc).
  45  *
  46  * Clients should NOT casually batch calls that in fact return results; that is,
  47  * the server side should be aware that a call is batched and not produce any
  48  * return message.  Batched calls that produce many result messages can
  49  * deadlock (netlock) the client and the server....
  50  *
  51  * Now go hang yourself.
  52  */
  53
  54 #include "namespace.h"
  55 #include "reentrant.h"
  56 #include <sys/types.h>
  57 #include <sys/poll.h>
  58 #include <sys/syslog.h>
  59 #include <sys/socket.h>
  60 #include <sys/un.h>
  61 #include <sys/uio.h>
  62
  63 #include <arpa/inet.h>
  64 #include <assert.h>
  65 #include <err.h>
  66 #include <errno.h>
  67 #include <netdb.h>
  68 #include <stdio.h>
  69 #include <stdlib.h>
  70 #include <string.h>
  71 #include <unistd.h>
  72 #include <signal.h>
  73
  74 #include <rpc/rpc.h>
  75 #include "un-namespace.h"
  76 #include "rpc_com.h"
  77 #include "mt_misc.h"
  78
  79 #define MCALL_MSG_SIZE 24
  80
  81 struct cmessage {
  82         struct cmsghdr cmsg;
  83         struct cmsgcred cmcred;
  84 };
  85
  86 static void              clnt_vc_abort(CLIENT *);
  87 static enum clnt_stat    clnt_vc_call(CLIENT *, rpcproc_t, xdrproc_t, void *,
  88                                       xdrproc_t, void *, struct timeval);
  89 static bool_t            clnt_vc_control(CLIENT *, u_int, void *);
  90 static void              clnt_vc_destroy(CLIENT *);
  91 static bool_t            clnt_vc_freeres(CLIENT *, xdrproc_t, void *);
  92 static void              clnt_vc_geterr(CLIENT *, struct rpc_err *);
  93 static struct clnt_ops  *clnt_vc_ops(void);
  94 static int               __msgread(int, void *, size_t);
  95 static int               __msgwrite(int, void *, size_t);
  96 static int               read_vc(void *, void *, int);
  97 static bool_t            time_not_ok(struct timeval *);
  98 static int               write_vc(void *, void *, int);
  99
 100 struct ct_data {
 101         int             ct_fd;          /* connection's fd */
 102         bool_t          ct_closeit;     /* close it on destroy */
 103         struct timeval  ct_wait;        /* wait interval in milliseconds */
 104         bool_t          ct_waitset;     /* wait set by clnt_control? */
 105         struct netbuf   ct_addr;        /* remote addr */
 106         struct rpc_err  ct_error;
 107         union {
 108                 char    ct_mcallc[MCALL_MSG_SIZE];      /* marshalled callmsg */
 109                 u_int32_t ct_mcalli;
 110         } ct_u;
 111         u_int           ct_mpos;        /* pos after marshal */
 112         XDR             ct_xdrs;        /* XDR stream */
 113 };
 114
 115 /*
 116  *      This machinery implements per-fd locks for MT-safety.  It is not
 117  *      sufficient to do per-CLIENT handle locks for MT-safety because a
 118  *      user may create more than one CLIENT handle with the same fd behind
 119  *      it.  Therfore, we allocate an array of flags (vc_fd_locks), protected
 120  *      by the clnt_fd_lock mutex, and an array (vc_cv) of condition variables
 121  *      similarly protected.  Vc_fd_lock[fd] == 1 => a call is activte on some
 122  *      CLIENT handle created for that fd.
 123  *      The current implementation holds locks across the entire RPC and reply.
 124  *      Yes, this is silly, and as soon as this code is proven to work, this
 125  *      should be the first thing fixed.  One step at a time.
 126  */
 127 static int      *vc_fd_locks;
 128 static cond_t   *vc_cv;
 129 #define release_fd_lock(fd, mask) {     \
 130         mutex_lock(&clnt_fd_lock);      \
 131         vc_fd_locks[fd] = 0;            \
 132         mutex_unlock(&clnt_fd_lock);    \
 133         thr_sigsetmask(SIG_SETMASK, &(mask), (sigset_t *) NULL);        \
 134         cond_signal(&vc_cv[fd]);        \
 135 }
 136
 137 static const char clnt_vc_errstr[] = "%s : %s";
 138 static const char clnt_vc_str[] = "clnt_vc_create";
 139 static const char clnt_read_vc_str[] = "read_vc";
 140 static const char __no_mem_str[] = "out of memory";
 141
 142 /*
 143  * Create a client handle for a connection.
 144  * Default options are set, which the user can change using clnt_control()'s.
 145  * The rpc/vc package does buffering similar to stdio, so the client
 146  * must pick send and receive buffer sizes, 0 => use the default.
 147  * NB: fd is copied into a private area.
 148  * NB: The rpch->cl_auth is set null authentication. Caller may wish to
 149  * set this something more useful.
 150  *
 151  * fd should be an open socket
 152  */
 153 CLIENT *
 154 clnt_vc_create(int fd,                  /* open file descriptor */
 155         const struct netbuf *raddr,     /* servers address */
 156         const rpcprog_t prog,           /* program number */
 157         const rpcvers_t vers,           /* version number */
 158         u_int sendsz,                   /* buffer recv size */
 159         u_int recvsz)                   /* buffer send size */
 160 {
 161         CLIENT *cl;                     /* client handle */
 162         struct ct_data *ct = NULL;      /* client handle */
 163         struct timeval now;
 164         struct rpc_msg call_msg;
 165         static u_int32_t disrupt;
 166         sigset_t mask;
 167         sigset_t newmask;
 168         struct sockaddr_storage ss;
 169         socklen_t slen;
 170         struct __rpc_sockinfo si;
 171
 172         if (disrupt == 0)
 173                 disrupt = (u_int32_t)(long)raddr;
 174
 175         cl = (CLIENT *)mem_alloc(sizeof (*cl));
 176         ct = (struct ct_data *)mem_alloc(sizeof (*ct));
 177         if ((cl == (CLIENT *)NULL) || (ct == (struct ct_data *)NULL)) {
 178                 syslog(LOG_ERR, clnt_vc_errstr, clnt_vc_str, __no_mem_str);
 179                 rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 180                 rpc_createerr.cf_error.re_errno = errno;
 181                 goto err;
 182         }
 183         ct->ct_addr.buf = NULL;
 184         sigfillset(&newmask);
 185         thr_sigsetmask(SIG_SETMASK, &newmask, &mask);
 186         mutex_lock(&clnt_fd_lock);
 187         if (vc_fd_locks == (int *) NULL) {
 188                 int cv_allocsz, fd_allocsz;
 189                 int dtbsize = __rpc_dtbsize();
 190
 191                 fd_allocsz = dtbsize * sizeof (int);
 192                 vc_fd_locks = (int *) mem_alloc(fd_allocsz);
 193                 if (vc_fd_locks == (int *) NULL) {
 194                         mutex_unlock(&clnt_fd_lock);
 195                         thr_sigsetmask(SIG_SETMASK, &(mask), NULL);
 196                         goto err;
 197                 } else
 198                         memset(vc_fd_locks, '\0', fd_allocsz);
 199
 200                 assert(vc_cv == (cond_t *) NULL);
 201                 cv_allocsz = dtbsize * sizeof (cond_t);
 202                 vc_cv = (cond_t *) mem_alloc(cv_allocsz);
 203                 if (vc_cv == (cond_t *) NULL) {
 204                         mem_free(vc_fd_locks, fd_allocsz);
 205                         vc_fd_locks = (int *) NULL;
 206                         mutex_unlock(&clnt_fd_lock);
 207                         thr_sigsetmask(SIG_SETMASK, &(mask), NULL);
 208                         goto err;
 209                 } else {
 210                         int i;
 211
 212                         for (i = 0; i < dtbsize; i++)
 213                                 cond_init(&vc_cv[i], 0, (void *) 0);
 214                 }
 215         } else
 216                 assert(vc_cv != (cond_t *) NULL);
 217
 218         /*
 219          * XXX - fvdl connecting while holding a mutex?
 220          */
 221         slen = sizeof ss;
 222         if (_getpeername(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) {
 223                 if (errno != ENOTCONN) {
 224                         rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 225                         rpc_createerr.cf_error.re_errno = errno;
 226                         mutex_unlock(&clnt_fd_lock);
 227                         thr_sigsetmask(SIG_SETMASK, &(mask), NULL);
 228                         goto err;
 229                 }
 230                 if (_connect(fd, (struct sockaddr *)raddr->buf, raddr->len) < 0){
 231                         rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 232                         rpc_createerr.cf_error.re_errno = errno;
 233                         mutex_unlock(&clnt_fd_lock);
 234                         thr_sigsetmask(SIG_SETMASK, &(mask), NULL);
 235                         goto err;
 236                 }
 237         }
 238         mutex_unlock(&clnt_fd_lock);
 239         thr_sigsetmask(SIG_SETMASK, &(mask), NULL);
 240         if (!__rpc_fd2sockinfo(fd, &si))
 241                 goto err;
 242
 243         ct->ct_closeit = FALSE;
 244
 245         /*
 246          * Set up private data struct
 247          */
 248         ct->ct_fd = fd;
 249         ct->ct_wait.tv_usec = 0;
 250         ct->ct_waitset = FALSE;
 251         ct->ct_addr.buf = malloc(raddr->maxlen);
 252         if (ct->ct_addr.buf == NULL)
 253                 goto err;
 254         memcpy(ct->ct_addr.buf, raddr->buf, raddr->len);
 255         ct->ct_addr.len = raddr->maxlen;
 256         ct->ct_addr.maxlen = raddr->maxlen;
 257
 258         /*
 259          * Initialize call message
 260          */
 261         gettimeofday(&now, NULL);
 262         call_msg.rm_xid = ((u_int32_t)++disrupt) ^ __RPC_GETXID(&now);
 263         call_msg.rm_direction = CALL;
 264         call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
 265         call_msg.rm_call.cb_prog = (u_int32_t)prog;
 266         call_msg.rm_call.cb_vers = (u_int32_t)vers;
 267
 268         /*
 269          * pre-serialize the static part of the call msg and stash it away
 270          */
 271         xdrmem_create(&(ct->ct_xdrs), ct->ct_u.ct_mcallc, MCALL_MSG_SIZE,
 272             XDR_ENCODE);
 273         if (! xdr_callhdr(&(ct->ct_xdrs), &call_msg)) {
 274                 if (ct->ct_closeit) {
 275                         _close(fd);
 276                 }
 277                 goto err;
 278         }
 279         ct->ct_mpos = XDR_GETPOS(&(ct->ct_xdrs));
 280         XDR_DESTROY(&(ct->ct_xdrs));
 281
 282         /*
 283          * Create a client handle which uses xdrrec for serialization
 284          * and authnone for authentication.
 285          */
 286         cl->cl_ops = clnt_vc_ops();
 287         cl->cl_private = ct;
 288         cl->cl_auth = authnone_create();
 289         sendsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsz);
 290         recvsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsz);
 291         xdrrec_create(&(ct->ct_xdrs), sendsz, recvsz,
 292             cl->cl_private, read_vc, write_vc);
 293         return (cl);
 294
 295 err:
 296         if (cl) {
 297                 if (ct) {
 298                         if (ct->ct_addr.len)
 299                                 mem_free(ct->ct_addr.buf, ct->ct_addr.len);
 300                         mem_free(ct, sizeof (struct ct_data));
 301                 }
 302                 if (cl)
 303                         mem_free(cl, sizeof (CLIENT));
 304         }
 305         return ((CLIENT *)NULL);
 306 }
 307
 308 static enum clnt_stat
 309 clnt_vc_call(CLIENT *cl, rpcproc_t proc, xdrproc_t xdr_args, void *args_ptr,
 310              xdrproc_t xdr_results, void *results_ptr, struct timeval timeout)
 311 {
 312         struct ct_data *ct = (struct ct_data *) cl->cl_private;
 313         XDR *xdrs = &(ct->ct_xdrs);
 314         struct rpc_msg reply_msg;
 315         u_int32_t x_id;
 316         u_int32_t *msg_x_id = &ct->ct_u.ct_mcalli;    /* yuk */
 317         bool_t shipnow;
 318         int refreshes = 2;
 319         sigset_t mask, newmask;
 320         int rpc_lock_value;
 321
 322         assert(cl != NULL);
 323
 324         sigfillset(&newmask);
 325         thr_sigsetmask(SIG_SETMASK, &newmask, &mask);
 326         mutex_lock(&clnt_fd_lock);
 327         while (vc_fd_locks[ct->ct_fd])
 328                 cond_wait(&vc_cv[ct->ct_fd], &clnt_fd_lock);
 329         if (__isthreaded)
 330                 rpc_lock_value = 1;
 331         else
 332                 rpc_lock_value = 0;
 333         vc_fd_locks[ct->ct_fd] = rpc_lock_value;
 334         mutex_unlock(&clnt_fd_lock);
 335         if (!ct->ct_waitset) {
 336                 /* If time is not within limits, we ignore it. */
 337                 if (time_not_ok(&timeout) == FALSE)
 338                         ct->ct_wait = timeout;
 339         }
 340
 341         shipnow =
 342             (xdr_results == NULL && timeout.tv_sec == 0
 343             && timeout.tv_usec == 0) ? FALSE : TRUE;
 344
 345 call_again:
 346         xdrs->x_op = XDR_ENCODE;
 347         ct->ct_error.re_status = RPC_SUCCESS;
 348         x_id = ntohl(--(*msg_x_id));
 349
 350         if ((! XDR_PUTBYTES(xdrs, ct->ct_u.ct_mcallc, ct->ct_mpos)) ||
 351             (! XDR_PUTINT32(xdrs, &proc)) ||
 352             (! AUTH_MARSHALL(cl->cl_auth, xdrs)) ||
 353             (! (*xdr_args)(xdrs, args_ptr))) {
 354                 if (ct->ct_error.re_status == RPC_SUCCESS)
 355                         ct->ct_error.re_status = RPC_CANTENCODEARGS;
 356                 xdrrec_endofrecord(xdrs, TRUE);
 357                 release_fd_lock(ct->ct_fd, mask);
 358                 return (ct->ct_error.re_status);
 359         }
 360         if (! xdrrec_endofrecord(xdrs, shipnow)) {
 361                 release_fd_lock(ct->ct_fd, mask);
 362                 return (ct->ct_error.re_status = RPC_CANTSEND);
 363         }
 364         if (! shipnow) {
 365                 release_fd_lock(ct->ct_fd, mask);
 366                 return (RPC_SUCCESS);
 367         }
 368         /*
 369          * Hack to provide rpc-based message passing
 370          */
 371         if (timeout.tv_sec == 0 && timeout.tv_usec == 0) {
 372                 release_fd_lock(ct->ct_fd, mask);
 373                 return(ct->ct_error.re_status = RPC_TIMEDOUT);
 374         }
 375
 376
 377         /*
 378          * Keep receiving until we get a valid transaction id
 379          */
 380         xdrs->x_op = XDR_DECODE;
 381         while (TRUE) {
 382                 reply_msg.acpted_rply.ar_verf = _null_auth;
 383                 reply_msg.acpted_rply.ar_results.where = NULL;
 384                 reply_msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void;
 385                 if (! xdrrec_skiprecord(xdrs)) {
 386                         release_fd_lock(ct->ct_fd, mask);
 387                         return (ct->ct_error.re_status);
 388                 }
 389                 /* now decode and validate the response header */
 390                 if (! xdr_replymsg(xdrs, &reply_msg)) {
 391                         if (ct->ct_error.re_status == RPC_SUCCESS)
 392                                 continue;
 393                         release_fd_lock(ct->ct_fd, mask);
 394                         return (ct->ct_error.re_status);
 395                 }
 396                 if (reply_msg.rm_xid == x_id)
 397                         break;
 398         }
 399
 400         /*
 401          * process header
 402          */
 403         _seterr_reply(&reply_msg, &(ct->ct_error));
 404         if (ct->ct_error.re_status == RPC_SUCCESS) {
 405                 if (! AUTH_VALIDATE(cl->cl_auth,
 406                     &reply_msg.acpted_rply.ar_verf)) {
 407                         ct->ct_error.re_status = RPC_AUTHERROR;
 408                         ct->ct_error.re_why = AUTH_INVALIDRESP;
 409                 } else if (! (*xdr_results)(xdrs, results_ptr)) {
 410                         if (ct->ct_error.re_status == RPC_SUCCESS)
 411                                 ct->ct_error.re_status = RPC_CANTDECODERES;
 412                 }
 413                 /* free verifier ... */
 414                 if (reply_msg.acpted_rply.ar_verf.oa_base != NULL) {
 415                         xdrs->x_op = XDR_FREE;
 416                         xdr_opaque_auth(xdrs, &(reply_msg.acpted_rply.ar_verf));
 417                 }
 418         }  /* end successful completion */
 419         else {
 420                 /* maybe our credentials need to be refreshed ... */
 421                 if (refreshes-- && AUTH_REFRESH(cl->cl_auth, &reply_msg))
 422                         goto call_again;
 423         }  /* end of unsuccessful completion */
 424         release_fd_lock(ct->ct_fd, mask);
 425         return (ct->ct_error.re_status);
 426 }
 427
 428 static void
 429 clnt_vc_geterr(CLIENT *cl, struct rpc_err *errp)
 430 {
 431         struct ct_data *ct;
 432
 433         assert(cl != NULL);
 434         assert(errp != NULL);
 435
 436         ct = (struct ct_data *) cl->cl_private;
 437         *errp = ct->ct_error;
 438 }
 439
 440 static bool_t
 441 clnt_vc_freeres(CLIENT *cl, xdrproc_t xdr_res, void *res_ptr)
 442 {
 443         struct ct_data *ct;
 444         XDR *xdrs;
 445         bool_t dummy;
 446         sigset_t mask;
 447         sigset_t newmask;
 448
 449         assert(cl != NULL);
 450
 451         ct = (struct ct_data *)cl->cl_private;
 452         xdrs = &(ct->ct_xdrs);
 453
 454         sigfillset(&newmask);
 455         thr_sigsetmask(SIG_SETMASK, &newmask, &mask);
 456         mutex_lock(&clnt_fd_lock);
 457         while (vc_fd_locks[ct->ct_fd])
 458                 cond_wait(&vc_cv[ct->ct_fd], &clnt_fd_lock);
 459         xdrs->x_op = XDR_FREE;
 460         dummy = (*xdr_res)(xdrs, res_ptr);
 461         mutex_unlock(&clnt_fd_lock);
 462         thr_sigsetmask(SIG_SETMASK, &(mask), NULL);
 463         cond_signal(&vc_cv[ct->ct_fd]);
 464
 465         return dummy;
 466 }
 467
 468 /*ARGSUSED*/
 469 static void
 470 clnt_vc_abort(CLIENT *cl)
 471 {
 472 }
 473
 474 static bool_t
 475 clnt_vc_control(CLIENT *cl, u_int request, void *info)
 476 {
 477         struct ct_data *ct;
 478         void *infop = info;
 479         sigset_t mask;
 480         sigset_t newmask;
 481         int rpc_lock_value;
 482
 483         assert(cl != NULL);
 484
 485         ct = (struct ct_data *)cl->cl_private;
 486
 487         sigfillset(&newmask);
 488         thr_sigsetmask(SIG_SETMASK, &newmask, &mask);
 489         mutex_lock(&clnt_fd_lock);
 490         while (vc_fd_locks[ct->ct_fd])
 491                 cond_wait(&vc_cv[ct->ct_fd], &clnt_fd_lock);
 492         if (__isthreaded)
 493                 rpc_lock_value = 1;
 494         else
 495                 rpc_lock_value = 0;
 496         vc_fd_locks[ct->ct_fd] = rpc_lock_value;
 497         mutex_unlock(&clnt_fd_lock);
 498
 499         switch (request) {
 500         case CLSET_FD_CLOSE:
 501                 ct->ct_closeit = TRUE;
 502                 release_fd_lock(ct->ct_fd, mask);
 503                 return (TRUE);
 504         case CLSET_FD_NCLOSE:
 505                 ct->ct_closeit = FALSE;
 506                 release_fd_lock(ct->ct_fd, mask);
 507                 return (TRUE);
 508         default:
 509                 break;
 510         }
 511
 512         /* for other requests which use info */
 513         if (info == NULL) {
 514                 release_fd_lock(ct->ct_fd, mask);
 515                 return (FALSE);
 516         }
 517         switch (request) {
 518         case CLSET_TIMEOUT:
 519                 if (time_not_ok((struct timeval *)info)) {
 520                         release_fd_lock(ct->ct_fd, mask);
 521                         return (FALSE);
 522                 }
 523                 ct->ct_wait = *(struct timeval *)infop;
 524                 ct->ct_waitset = TRUE;
 525                 break;
 526         case CLGET_TIMEOUT:
 527                 *(struct timeval *)infop = ct->ct_wait;
 528                 break;
 529         case CLGET_SERVER_ADDR:
 530                 memcpy(info, ct->ct_addr.buf, (size_t)ct->ct_addr.len);
 531                 break;
 532         case CLGET_FD:
 533                 *(int *)info = ct->ct_fd;
 534                 break;
 535         case CLGET_SVC_ADDR:
 536                 /* The caller should not free this memory area */
 537                 *(struct netbuf *)info = ct->ct_addr;
 538                 break;
 539         case CLSET_SVC_ADDR:            /* set to new address */
 540                 release_fd_lock(ct->ct_fd, mask);
 541                 return (FALSE);
 542         case CLGET_XID:
 543                 /*
 544                  * use the knowledge that xid is the
 545                  * first element in the call structure
 546                  * This will get the xid of the PREVIOUS call
 547                  */
 548                 *(u_int32_t *)info =
 549                     ntohl(*(u_int32_t *)(void *)&ct->ct_u.ct_mcalli);
 550                 break;
 551         case CLSET_XID:
 552                 /* This will set the xid of the NEXT call */
 553                 *(u_int32_t *)(void *)&ct->ct_u.ct_mcalli =
 554                     htonl(*((u_int32_t *)info) + 1);
 555                 /* increment by 1 as clnt_vc_call() decrements once */
 556                 break;
 557         case CLGET_VERS:
 558                 /*
 559                  * This RELIES on the information that, in the call body,
 560                  * the version number field is the fifth field from the
 561                  * begining of the RPC header. MUST be changed if the
 562                  * call_struct is changed
 563                  */
 564                 *(u_int32_t *)info =
 565                     ntohl(*(u_int32_t *)(void *)(ct->ct_u.ct_mcallc +
 566                     4 * BYTES_PER_XDR_UNIT));
 567                 break;
 568
 569         case CLSET_VERS:
 570                 *(u_int32_t *)(void *)(ct->ct_u.ct_mcallc +
 571                     4 * BYTES_PER_XDR_UNIT) =
 572                     htonl(*(u_int32_t *)info);
 573                 break;
 574
 575         case CLGET_PROG:
 576                 /*
 577                  * This RELIES on the information that, in the call body,
 578                  * the program number field is the fourth field from the
 579                  * begining of the RPC header. MUST be changed if the
 580                  * call_struct is changed
 581                  */
 582                 *(u_int32_t *)info =
 583                     ntohl(*(u_int32_t *)(void *)(ct->ct_u.ct_mcallc +
 584                     3 * BYTES_PER_XDR_UNIT));
 585                 break;
 586
 587         case CLSET_PROG:
 588                 *(u_int32_t *)(void *)(ct->ct_u.ct_mcallc +
 589                     3 * BYTES_PER_XDR_UNIT) =
 590                     htonl(*(u_int32_t *)info);
 591                 break;
 592
 593         default:
 594                 release_fd_lock(ct->ct_fd, mask);
 595                 return (FALSE);
 596         }
 597         release_fd_lock(ct->ct_fd, mask);
 598         return (TRUE);
 599 }
 600
 601
 602 static void
 603 clnt_vc_destroy(CLIENT *cl)
 604 {
 605         struct ct_data *ct = (struct ct_data *) cl->cl_private;
 606         int ct_fd = ct->ct_fd;
 607         sigset_t mask;
 608         sigset_t newmask;
 609
 610         assert(cl != NULL);
 611
 612         ct = (struct ct_data *) cl->cl_private;
 613
 614         sigfillset(&newmask);
 615         thr_sigsetmask(SIG_SETMASK, &newmask, &mask);
 616         mutex_lock(&clnt_fd_lock);
 617         while (vc_fd_locks[ct_fd])
 618                 cond_wait(&vc_cv[ct_fd], &clnt_fd_lock);
 619         if (ct->ct_closeit && ct->ct_fd != -1) {
 620                 _close(ct->ct_fd);
 621         }
 622         XDR_DESTROY(&(ct->ct_xdrs));
 623         if (ct->ct_addr.buf)
 624                 free(ct->ct_addr.buf);
 625         mem_free(ct, sizeof(struct ct_data));
 626         mem_free(cl, sizeof(CLIENT));
 627         mutex_unlock(&clnt_fd_lock);
 628         thr_sigsetmask(SIG_SETMASK, &(mask), NULL);
 629         cond_signal(&vc_cv[ct_fd]);
 630 }
 631
 632 /*
 633  * Interface between xdr serializer and tcp connection.
 634  * Behaves like the system calls, read & write, but keeps some error state
 635  * around for the rpc level.
 636  */
 637 static int
 638 read_vc(void *ctp, void *buf, int len)
 639 {
 640         struct sockaddr sa;
 641         socklen_t sal;
 642         struct ct_data *ct = (struct ct_data *)ctp;
 643         struct pollfd fd;
 644         int milliseconds = (int)((ct->ct_wait.tv_sec * 1000) +
 645             (ct->ct_wait.tv_usec / 1000));
 646
 647         if (len == 0)
 648                 return (0);
 649         fd.fd = ct->ct_fd;
 650         fd.events = POLLIN;
 651         for (;;) {
 652                 switch (_poll(&fd, 1, milliseconds)) {
 653                 case 0:
 654                         ct->ct_error.re_status = RPC_TIMEDOUT;
 655                         return (-1);
 656
 657                 case -1:
 658                         if (errno == EINTR)
 659                                 continue;
 660                         ct->ct_error.re_status = RPC_CANTRECV;
 661                         ct->ct_error.re_errno = errno;
 662                         return (-1);
 663                 }
 664                 break;
 665         }
 666
 667         sal = sizeof(sa);
 668         if ((_getpeername(ct->ct_fd, &sa, &sal) == 0) &&
 669             (sa.sa_family == AF_LOCAL)) {
 670                 len = __msgread(ct->ct_fd, buf, (size_t)len);
 671         } else {
 672                 len = _read(ct->ct_fd, buf, (size_t)len);
 673         }
 674
 675         switch (len) {
 676         case 0:
 677                 /* premature eof */
 678                 ct->ct_error.re_errno = ECONNRESET;
 679                 ct->ct_error.re_status = RPC_CANTRECV;
 680                 len = -1;  /* it's really an error */
 681                 break;
 682
 683         case -1:
 684                 ct->ct_error.re_errno = errno;
 685                 ct->ct_error.re_status = RPC_CANTRECV;
 686                 break;
 687         }
 688         return (len);
 689 }
 690
 691 static int
 692 write_vc(void *ctp, void *buf, int len)
 693 {
 694         struct sockaddr sa;
 695         socklen_t sal;
 696         struct ct_data *ct = (struct ct_data *)ctp;
 697         int i, cnt;
 698
 699         sal = sizeof(sa);
 700         if ((_getpeername(ct->ct_fd, &sa, &sal) == 0) &&
 701             (sa.sa_family == AF_LOCAL)) {
 702                 for (cnt = len; cnt > 0; cnt -= i, buf = (char *)buf + i) {
 703                         if ((i = __msgwrite(ct->ct_fd, buf,
 704                              (size_t)cnt)) == -1) {
 705                                 ct->ct_error.re_errno = errno;
 706                                 ct->ct_error.re_status = RPC_CANTSEND;
 707                                 return (-1);
 708                         }
 709                 }
 710         } else {
 711                 for (cnt = len; cnt > 0; cnt -= i, buf = (char *)buf + i) {
 712                         if ((i = _write(ct->ct_fd, buf, (size_t)cnt)) == -1) {
 713                                 ct->ct_error.re_errno = errno;
 714                                 ct->ct_error.re_status = RPC_CANTSEND;
 715                                 return (-1);
 716                         }
 717                 }
 718         }
 719         return (len);
 720 }
 721
 722 static struct clnt_ops *
 723 clnt_vc_ops(void)
 724 {
 725         static struct clnt_ops ops;
 726         sigset_t mask, newmask;
 727
 728         /* VARIABLES PROTECTED BY ops_lock: ops */
 729
 730         sigfillset(&newmask);
 731         thr_sigsetmask(SIG_SETMASK, &newmask, &mask);
 732         mutex_lock(&ops_lock);
 733         if (ops.cl_call == NULL) {
 734                 ops.cl_call = clnt_vc_call;
 735                 ops.cl_abort = clnt_vc_abort;
 736                 ops.cl_geterr = clnt_vc_geterr;
 737                 ops.cl_freeres = clnt_vc_freeres;
 738                 ops.cl_destroy = clnt_vc_destroy;
 739                 ops.cl_control = clnt_vc_control;
 740         }
 741         mutex_unlock(&ops_lock);
 742         thr_sigsetmask(SIG_SETMASK, &(mask), NULL);
 743         return (&ops);
 744 }
 745
 746 /*
 747  * Make sure that the time is not garbage.   -1 value is disallowed.
 748  * Note this is different from time_not_ok in clnt_dg.c
 749  */
 750 static bool_t
 751 time_not_ok(struct timeval *t)
 752 {
 753         return (t->tv_sec <= -1 || t->tv_sec > 100000000 ||
 754                 t->tv_usec <= -1 || t->tv_usec > 1000000);
 755 }
 756
 757 static int
 758 __msgread(int sock, void *buf, size_t cnt)
 759 {
 760         struct iovec iov[1];
 761         struct msghdr msg;
 762         union {
 763                 struct cmsghdr cmsg;
 764                 char control[CMSG_SPACE(sizeof(struct cmsgcred))];
 765         } cm;
 766
 767         bzero((char *)&cm, sizeof(cm));
 768         iov[0].iov_base = buf;
 769         iov[0].iov_len = cnt;
 770
 771         msg.msg_iov = iov;
 772         msg.msg_iovlen = 1;
 773         msg.msg_name = NULL;
 774         msg.msg_namelen = 0;
 775         msg.msg_control = (caddr_t)&cm;
 776         msg.msg_controllen = CMSG_SPACE(sizeof(struct cmsgcred));
 777         msg.msg_flags = 0;
 778
 779         return(_recvmsg(sock, &msg, 0));
 780 }
 781
 782 static int
 783 __msgwrite(int sock, void *buf, size_t cnt)
 784 {
 785         struct iovec iov[1];
 786         struct msghdr msg;
 787         union {
 788                 struct cmsghdr cmsg;
 789                 char control[CMSG_SPACE(sizeof(struct cmsgcred))];
 790         } cm;
 791
 792         bzero((char *)&cm, sizeof(cm));
 793         iov[0].iov_base = buf;
 794         iov[0].iov_len = cnt;
 795
 796         cm.cmsg.cmsg_type = SCM_CREDS;
 797         cm.cmsg.cmsg_level = SOL_SOCKET;
 798         cm.cmsg.cmsg_len = CMSG_LEN(sizeof(struct cmsgcred));
 799
 800         msg.msg_iov = iov;
 801         msg.msg_iovlen = 1;
 802         msg.msg_name = NULL;
 803         msg.msg_namelen = 0;
 804         msg.msg_control = (caddr_t)&cm;
 805         msg.msg_controllen = CMSG_SPACE(sizeof(struct cmsgcred));
 806         msg.msg_flags = 0;
 807
 808         return(_sendmsg(sock, &msg, 0));
 809 }