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