lib/libc/rpc/clnt_dg.c

   1 /*      $NetBSD: clnt_dg.c,v 1.24 2010/12/08 02:06:38 joerg Exp $       */
   2
   3 /*
   4  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   5  * unrestricted use provided that this legend is included on all tape
   6  * media and as a part of the software program in whole or part.  Users
   7  * may copy or modify Sun RPC without charge, but are not authorized
   8  * to license or distribute it to anyone else except as part of a product or
   9  * program developed by the user.
  10  *
  11  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  12  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  13  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  14  *
  15  * Sun RPC is provided with no support and without any obligation on the
  16  * part of Sun Microsystems, Inc. to assist in its use, correction,
  17  * modification or enhancement.
  18  *
  19  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  20  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  21  * OR ANY PART THEREOF.
  22  *
  23  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  24  * or profits or other special, indirect and consequential damages, even if
  25  * Sun has been advised of the possibility of such damages.
  26  *
  27  * Sun Microsystems, Inc.
  28  * 2550 Garcia Avenue
  29  * Mountain View, California  94043
  30  */
  31 /*
  32  * Copyright (c) 1986-1991 by Sun Microsystems Inc.
  33  */
  34
  35 /* #ident       "@(#)clnt_dg.c  1.23    94/04/22 SMI" */
  36
  37 #include <sys/cdefs.h>
  38 #if defined(LIBC_SCCS) && !defined(lint)
  39 #if 0
  40 static char sccsid[] = "@(#)clnt_dg.c 1.19 89/03/16 Copyr 1988 Sun Micro";
  41 #else
  42 __RCSID("$NetBSD: clnt_dg.c,v 1.24 2010/12/08 02:06:38 joerg Exp $");
  43 #endif
  44 #endif
  45
  46 /*
  47  * Implements a connectionless client side RPC.
  48  */
  49
  50 #include "namespace.h"
  51 #include "reentrant.h"
  52 #include <sys/poll.h>
  53 #include <sys/types.h>
  54 #include <sys/time.h>
  55 #include <sys/socket.h>
  56 #include <sys/ioctl.h>
  57 #include <rpc/rpc.h>
  58 #include <assert.h>
  59 #include <errno.h>
  60 #include <stdlib.h>
  61 #include <string.h>
  62 #include <signal.h>
  63 #include <unistd.h>
  64 #include <err.h>
  65 #include "rpc_internal.h"
  66
  67 #ifdef __weak_alias
  68 __weak_alias(clnt_dg_create,_clnt_dg_create)
  69 #endif
  70
  71 #define RPC_MAX_BACKOFF         30 /* seconds */
  72
  73
  74 static struct clnt_ops *clnt_dg_ops __P((void));
  75 static bool_t time_not_ok __P((struct timeval *));
  76 static enum clnt_stat clnt_dg_call __P((CLIENT *, rpcproc_t, xdrproc_t,
  77     const char *, xdrproc_t, caddr_t, struct timeval));
  78 static void clnt_dg_geterr __P((CLIENT *, struct rpc_err *));
  79 static bool_t clnt_dg_freeres __P((CLIENT *, xdrproc_t, caddr_t));
  80 static void clnt_dg_abort __P((CLIENT *));
  81 static bool_t clnt_dg_control __P((CLIENT *, u_int, char *));
  82 static void clnt_dg_destroy __P((CLIENT *));
  83
  84
  85
  86
  87 /*
  88  *      This machinery implements per-fd locks for MT-safety.  It is not
  89  *      sufficient to do per-CLIENT handle locks for MT-safety because a
  90  *      user may create more than one CLIENT handle with the same fd behind
  91  *      it.  Therfore, we allocate an array of flags (dg_fd_locks), protected
  92  *      by the clnt_fd_lock mutex, and an array (dg_cv) of condition variables
  93  *      similarly protected.  Dg_fd_lock[fd] == 1 => a call is activte on some
  94  *      CLIENT handle created for that fd.
  95  *      The current implementation holds locks across the entire RPC and reply,
  96  *      including retransmissions.  Yes, this is silly, and as soon as this
  97  *      code is proven to work, this should be the first thing fixed.  One step
  98  *      at a time.
  99  */
 100 static int      *dg_fd_locks;
 101 #ifdef _REENTRANT
 102 #define __rpc_lock_value __isthreaded;
 103 extern mutex_t clnt_fd_lock;
 104 static cond_t   *dg_cv;
 105 #define release_fd_lock(fd, mask) {             \
 106         mutex_lock(&clnt_fd_lock);      \
 107         dg_fd_locks[fd] = 0;            \
 108         mutex_unlock(&clnt_fd_lock);    \
 109         thr_sigsetmask(SIG_SETMASK, &(mask), NULL);     \
 110         cond_signal(&dg_cv[fd]);        \
 111 }
 112 #else
 113 #define release_fd_lock(fd,mask)
 114 #define __rpc_lock_value 0
 115 #endif
 116
 117 static const char mem_err_clnt_dg[] = "clnt_dg_create: out of memory";
 118
 119 /* VARIABLES PROTECTED BY clnt_fd_lock: dg_fd_locks, dg_cv */
 120
 121 /*
 122  * Private data kept per client handle
 123  */
 124 struct cu_data {
 125         int                     cu_fd;          /* connections fd */
 126         bool_t                  cu_closeit;     /* opened by library */
 127         struct sockaddr_storage cu_raddr;       /* remote address */
 128         int                     cu_rlen;
 129         struct timeval          cu_wait;        /* retransmit interval */
 130         struct timeval          cu_total;       /* total time for the call */
 131         struct rpc_err          cu_error;
 132         XDR                     cu_outxdrs;
 133         u_int                   cu_xdrpos;
 134         u_int                   cu_sendsz;      /* send size */
 135         char                    *cu_outbuf;
 136         u_int                   cu_recvsz;      /* recv size */
 137         struct pollfd           cu_pfdp;
 138         char                    cu_inbuf[1];
 139 };
 140
 141 /*
 142  * Connection less client creation returns with client handle parameters.
 143  * Default options are set, which the user can change using clnt_control().
 144  * fd should be open and bound.
 145  * NB: The rpch->cl_auth is initialized to null authentication.
 146  *      Caller may wish to set this something more useful.
 147  *
 148  * sendsz and recvsz are the maximum allowable packet sizes that can be
 149  * sent and received. Normally they are the same, but they can be
 150  * changed to improve the program efficiency and buffer allocation.
 151  * If they are 0, use the transport default.
 152  *
 153  * If svcaddr is NULL, returns NULL.
 154  */
 155 CLIENT *
 156 clnt_dg_create(fd, svcaddr, program, version, sendsz, recvsz)
 157         int fd;                         /* open file descriptor */
 158         const struct netbuf *svcaddr;   /* servers address */
 159         rpcprog_t program;              /* program number */
 160         rpcvers_t version;              /* version number */
 161         u_int sendsz;                   /* buffer recv size */
 162         u_int recvsz;                   /* buffer send size */
 163 {
 164         CLIENT *cl = NULL;              /* client handle */
 165         struct cu_data *cu = NULL;      /* private data */
 166         struct rpc_msg call_msg;
 167 #ifdef _REENTRANT
 168         sigset_t mask;
 169 #endif
 170         sigset_t newmask;
 171         struct __rpc_sockinfo si;
 172         int one = 1;
 173
 174         sigfillset(&newmask);
 175         thr_sigsetmask(SIG_SETMASK, &newmask, &mask);
 176         mutex_lock(&clnt_fd_lock);
 177         if (dg_fd_locks == NULL) {
 178 #ifdef _REENTRANT
 179                 size_t cv_allocsz;
 180 #endif
 181                 size_t fd_allocsz;
 182                 int dtbsize = __rpc_dtbsize();
 183
 184                 fd_allocsz = dtbsize * sizeof (int);
 185                 dg_fd_locks = mem_alloc(fd_allocsz);
 186                 if (dg_fd_locks == NULL) {
 187                         mutex_unlock(&clnt_fd_lock);
 188                         thr_sigsetmask(SIG_SETMASK, &(mask), NULL);
 189                         goto err1;
 190                 } else
 191                         memset(dg_fd_locks, '\0', fd_allocsz);
 192
 193 #ifdef _REENTRANT
 194                 cv_allocsz = dtbsize * sizeof (cond_t);
 195                 dg_cv = mem_alloc(cv_allocsz);
 196                 if (dg_cv == NULL) {
 197                         mem_free(dg_fd_locks, fd_allocsz);
 198                         dg_fd_locks = NULL;
 199                         mutex_unlock(&clnt_fd_lock);
 200                         thr_sigsetmask(SIG_SETMASK, &(mask), NULL);
 201                         goto err1;
 202                 } else {
 203                         int i;
 204
 205                         for (i = 0; i < dtbsize; i++)
 206                                 cond_init(&dg_cv[i], 0, (void *) 0);
 207                 }
 208 #endif
 209         }
 210
 211         mutex_unlock(&clnt_fd_lock);
 212         thr_sigsetmask(SIG_SETMASK, &(mask), NULL);
 213
 214         if (svcaddr == NULL) {
 215                 rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
 216                 return (NULL);
 217         }
 218
 219         if (!__rpc_fd2sockinfo(fd, &si)) {
 220                 rpc_createerr.cf_stat = RPC_TLIERROR;
 221                 rpc_createerr.cf_error.re_errno = 0;
 222                 return (NULL);
 223         }
 224         /*
 225          * Find the receive and the send size
 226          */
 227         sendsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsz);
 228         recvsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsz);
 229         if ((sendsz == 0) || (recvsz == 0)) {
 230                 rpc_createerr.cf_stat = RPC_TLIERROR; /* XXX */
 231                 rpc_createerr.cf_error.re_errno = 0;
 232                 return (NULL);
 233         }
 234
 235         if ((cl = mem_alloc(sizeof (CLIENT))) == NULL)
 236                 goto err1;
 237         /*
 238          * Should be multiple of 4 for XDR.
 239          */
 240         sendsz = ((sendsz + 3) / 4) * 4;
 241         recvsz = ((recvsz + 3) / 4) * 4;
 242         cu = malloc(sizeof (*cu) + sendsz + recvsz);
 243         if (cu == NULL)
 244                 goto err1;
 245         memset(cu, 0, sizeof(*cu));
 246         (void) memcpy(&cu->cu_raddr, svcaddr->buf, (size_t)svcaddr->len);
 247         cu->cu_rlen = svcaddr->len;
 248         cu->cu_outbuf = &cu->cu_inbuf[recvsz];
 249         /* Other values can also be set through clnt_control() */
 250         cu->cu_wait.tv_sec = 15;        /* heuristically chosen */
 251         cu->cu_wait.tv_usec = 0;
 252         cu->cu_total.tv_sec = -1;
 253         cu->cu_total.tv_usec = -1;
 254         cu->cu_sendsz = sendsz;
 255         cu->cu_recvsz = recvsz;
 256         call_msg.rm_xid = __RPC_GETXID();
 257         call_msg.rm_call.cb_prog = program;
 258         call_msg.rm_call.cb_vers = version;
 259         xdrmem_create(&(cu->cu_outxdrs), cu->cu_outbuf, sendsz, XDR_ENCODE);
 260         if (! xdr_callhdr(&(cu->cu_outxdrs), &call_msg)) {
 261                 rpc_createerr.cf_stat = RPC_CANTENCODEARGS;  /* XXX */
 262                 rpc_createerr.cf_error.re_errno = 0;
 263                 goto err2;
 264         }
 265         cu->cu_xdrpos = XDR_GETPOS(&(cu->cu_outxdrs));
 266
 267         /* XXX fvdl - do we still want this? */
 268 #if 0
 269         (void)bindresvport_sa(fd, (struct sockaddr *)svcaddr->buf);
 270 #endif
 271         ioctl(fd, FIONBIO, (char *)(void *)&one);
 272
 273         /*
 274          * By default, closeit is always FALSE. It is users responsibility
 275          * to do a close on it, else the user may use clnt_control
 276          * to let clnt_destroy do it for him/her.
 277          */
 278         cu->cu_closeit = FALSE;
 279         cu->cu_fd = fd;
 280         cu->cu_pfdp.fd = cu->cu_fd;
 281         cu->cu_pfdp.events = POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND;
 282         cl->cl_ops = clnt_dg_ops();
 283         cl->cl_private = (caddr_t)(void *)cu;
 284         cl->cl_auth = authnone_create();
 285         cl->cl_tp = NULL;
 286         cl->cl_netid = NULL;
 287         return (cl);
 288 err1:
 289         warnx(mem_err_clnt_dg);
 290         rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 291         rpc_createerr.cf_error.re_errno = errno;
 292 err2:
 293         if (cl) {
 294                 mem_free(cl, sizeof (CLIENT));
 295                 if (cu)
 296                         mem_free(cu, sizeof (*cu) + sendsz + recvsz);
 297         }
 298         return (NULL);
 299 }
 300
 301 static enum clnt_stat
 302 clnt_dg_call(cl, proc, xargs, argsp, xresults, resultsp, utimeout)
 303         CLIENT  *cl;                    /* client handle */
 304         rpcproc_t       proc;           /* procedure number */
 305         xdrproc_t       xargs;          /* xdr routine for args */
 306         const char *    argsp;          /* pointer to args */
 307         xdrproc_t       xresults;       /* xdr routine for results */
 308         caddr_t         resultsp;       /* pointer to results */
 309         struct timeval  utimeout;       /* seconds to wait before giving up */
 310 {
 311         struct cu_data *cu;
 312         XDR *xdrs;
 313         size_t outlen;
 314         struct rpc_msg reply_msg;
 315         XDR reply_xdrs;
 316         bool_t ok;
 317         int nrefreshes = 2;             /* number of times to refresh cred */
 318         struct timeval timeout;
 319         struct timeval retransmit_time;
 320         struct timeval next_sendtime, starttime, time_waited, tv;
 321 #ifdef _REENTRANT
 322         sigset_t mask, *maskp = &mask;
 323 #else
 324         sigset_t *maskp = NULL;
 325 #endif
 326         sigset_t newmask;
 327         ssize_t recvlen = 0;
 328         struct timespec ts;
 329         int n;
 330
 331         _DIAGASSERT(cl != NULL);
 332
 333         cu = (struct cu_data *)cl->cl_private;
 334
 335         sigfillset(&newmask);
 336         thr_sigsetmask(SIG_SETMASK, &newmask, &mask);
 337         mutex_lock(&clnt_fd_lock);
 338         while (dg_fd_locks[cu->cu_fd])
 339                 cond_wait(&dg_cv[cu->cu_fd], &clnt_fd_lock);
 340         dg_fd_locks[cu->cu_fd] = __rpc_lock_value;
 341         mutex_unlock(&clnt_fd_lock);
 342         if (cu->cu_total.tv_usec == -1) {
 343                 timeout = utimeout;     /* use supplied timeout */
 344         } else {
 345                 timeout = cu->cu_total; /* use default timeout */
 346         }
 347
 348         time_waited.tv_sec = 0;
 349         time_waited.tv_usec = 0;
 350         retransmit_time = next_sendtime = cu->cu_wait;
 351         gettimeofday(&starttime, NULL);
 352
 353 call_again:
 354         xdrs = &(cu->cu_outxdrs);
 355         xdrs->x_op = XDR_ENCODE;
 356         XDR_SETPOS(xdrs, cu->cu_xdrpos);
 357         /*
 358          * the transaction is the first thing in the out buffer
 359          */
 360         (*(u_int32_t *)(void *)(cu->cu_outbuf))++;
 361         if ((! XDR_PUTINT32(xdrs, (int32_t *)&proc)) ||
 362             (! AUTH_MARSHALL(cl->cl_auth, xdrs)) ||
 363             (! (*xargs)(xdrs, __UNCONST(argsp)))) {
 364                 cu->cu_error.re_status = RPC_CANTENCODEARGS;
 365                 goto out;
 366         }
 367         outlen = (size_t)XDR_GETPOS(xdrs);
 368
 369 send_again:
 370         if ((size_t)sendto(cu->cu_fd, cu->cu_outbuf, outlen, 0,
 371             (struct sockaddr *)(void *)&cu->cu_raddr, (socklen_t)cu->cu_rlen)
 372             != outlen) {
 373                 cu->cu_error.re_errno = errno;
 374                 cu->cu_error.re_status = RPC_CANTSEND;
 375                 goto out;
 376         }
 377
 378         /*
 379          * Hack to provide rpc-based message passing
 380          */
 381         if (timeout.tv_sec == 0 && timeout.tv_usec == 0) {
 382                 cu->cu_error.re_status = RPC_TIMEDOUT;
 383                 goto out;
 384         }
 385         /*
 386          * sub-optimal code appears here because we have
 387          * some clock time to spare while the packets are in flight.
 388          * (We assume that this is actually only executed once.)
 389          */
 390         reply_msg.acpted_rply.ar_verf = _null_auth;
 391         reply_msg.acpted_rply.ar_results.where = resultsp;
 392         reply_msg.acpted_rply.ar_results.proc = xresults;
 393
 394
 395         for (;;) {
 396                 /* Decide how long to wait. */
 397                 if (timercmp(&next_sendtime, &timeout, <))
 398                         timersub(&next_sendtime, &time_waited, &tv);
 399                 else
 400                         timersub(&timeout, &time_waited, &tv);
 401                 if (tv.tv_sec < 0 || tv.tv_usec < 0)
 402                         tv.tv_sec = tv.tv_usec = 0;
 403                 TIMEVAL_TO_TIMESPEC(&tv, &ts);
 404
 405                 n = pollts(&cu->cu_pfdp, 1, &ts, maskp);
 406                 if (n == 1) {
 407                         /* We have some data now */
 408                         do {
 409                                 recvlen = recvfrom(cu->cu_fd, cu->cu_inbuf,
 410                                     cu->cu_recvsz, 0, NULL, NULL);
 411                         } while (recvlen < 0 && errno == EINTR);
 412
 413                         if (recvlen < 0 && errno != EWOULDBLOCK) {
 414                                 cu->cu_error.re_errno = errno;
 415                                 cu->cu_error.re_status = RPC_CANTRECV;
 416                                 goto out;
 417                         }
 418                         if (recvlen >= (ssize_t)sizeof(uint32_t) &&
 419                             (*((uint32_t *)(void *)(cu->cu_inbuf)) ==
 420                                 *((uint32_t *)(void *)(cu->cu_outbuf)))) {
 421                                 /* We now assume we have the proper reply. */
 422                                 break;
 423                         }
 424                 }
 425                 if (n == -1) {
 426                         cu->cu_error.re_errno = errno;
 427                         cu->cu_error.re_status = RPC_CANTRECV;
 428                         goto out;
 429                 }
 430
 431                 gettimeofday(&tv, NULL);
 432                 timersub(&tv, &starttime, &time_waited);
 433
 434                 /* Check for timeout. */
 435                 if (timercmp(&time_waited, &timeout, >)) {
 436                         cu->cu_error.re_status = RPC_TIMEDOUT;
 437                         goto out;
 438                 }
 439
 440                 /* Retransmit if necessary. */
 441                 if (timercmp(&time_waited, &next_sendtime, >)) {
 442                         /* update retransmit_time */
 443                         if (retransmit_time.tv_sec < RPC_MAX_BACKOFF)
 444                                 timeradd(&retransmit_time, &retransmit_time,
 445                                     &retransmit_time);
 446                         timeradd(&next_sendtime, &retransmit_time,
 447                             &next_sendtime);
 448                         goto send_again;
 449                 }
 450         }
 451
 452         /*
 453          * now decode and validate the response
 454          */
 455
 456         xdrmem_create(&reply_xdrs, cu->cu_inbuf, (u_int)recvlen, XDR_DECODE);
 457         ok = xdr_replymsg(&reply_xdrs, &reply_msg);
 458         /* XDR_DESTROY(&reply_xdrs);    save a few cycles on noop destroy */
 459         if (ok) {
 460                 if ((reply_msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
 461                         (reply_msg.acpted_rply.ar_stat == SUCCESS))
 462                         cu->cu_error.re_status = RPC_SUCCESS;
 463                 else
 464                         _seterr_reply(&reply_msg, &(cu->cu_error));
 465
 466                 if (cu->cu_error.re_status == RPC_SUCCESS) {
 467                         if (! AUTH_VALIDATE(cl->cl_auth,
 468                                             &reply_msg.acpted_rply.ar_verf)) {
 469                                 cu->cu_error.re_status = RPC_AUTHERROR;
 470                                 cu->cu_error.re_why = AUTH_INVALIDRESP;
 471                         }
 472                         if (reply_msg.acpted_rply.ar_verf.oa_base != NULL) {
 473                                 xdrs->x_op = XDR_FREE;
 474                                 (void) xdr_opaque_auth(xdrs,
 475                                         &(reply_msg.acpted_rply.ar_verf));
 476                         }
 477                 }               /* end successful completion */
 478                 /*
 479                  * If unsuccesful AND error is an authentication error
 480                  * then refresh credentials and try again, else break
 481                  */
 482                 else if (cu->cu_error.re_status == RPC_AUTHERROR)
 483                         /* maybe our credentials need to be refreshed ... */
 484                         if (nrefreshes > 0 && AUTH_REFRESH(cl->cl_auth)) {
 485                                 nrefreshes--;
 486                                 goto call_again;
 487                         }
 488                 /* end of unsuccessful completion */
 489         }       /* end of valid reply message */
 490         else {
 491                 cu->cu_error.re_status = RPC_CANTDECODERES;
 492
 493         }
 494 out:
 495         release_fd_lock(cu->cu_fd, mask);
 496         return (cu->cu_error.re_status);
 497 }
 498
 499 static void
 500 clnt_dg_geterr(cl, errp)
 501         CLIENT *cl;
 502         struct rpc_err *errp;
 503 {
 504         struct cu_data *cu;
 505
 506         _DIAGASSERT(cl != NULL);
 507         _DIAGASSERT(errp != NULL);
 508
 509         cu = (struct cu_data *)cl->cl_private;
 510         *errp = cu->cu_error;
 511 }
 512
 513 static bool_t
 514 clnt_dg_freeres(cl, xdr_res, res_ptr)
 515         CLIENT *cl;
 516         xdrproc_t xdr_res;
 517         caddr_t res_ptr;
 518 {
 519         struct cu_data *cu;
 520         XDR *xdrs;
 521         bool_t dummy;
 522 #ifdef _REENTRANT
 523         sigset_t mask;
 524 #endif
 525         sigset_t newmask;
 526
 527         _DIAGASSERT(cl != NULL);
 528         cu = (struct cu_data *)cl->cl_private;
 529         xdrs = &(cu->cu_outxdrs);
 530
 531         sigfillset(&newmask);
 532         thr_sigsetmask(SIG_SETMASK, &newmask, &mask);
 533         mutex_lock(&clnt_fd_lock);
 534         while (dg_fd_locks[cu->cu_fd])
 535                 cond_wait(&dg_cv[cu->cu_fd], &clnt_fd_lock);
 536         xdrs->x_op = XDR_FREE;
 537         dummy = (*xdr_res)(xdrs, res_ptr);
 538         mutex_unlock(&clnt_fd_lock);
 539         thr_sigsetmask(SIG_SETMASK, &mask, NULL);
 540         cond_signal(&dg_cv[cu->cu_fd]);
 541         return (dummy);
 542 }
 543
 544 /*ARGSUSED*/
 545 static void
 546 clnt_dg_abort(h)
 547         CLIENT *h;
 548 {
 549 }
 550
 551 static bool_t
 552 clnt_dg_control(cl, request, info)
 553         CLIENT *cl;
 554         u_int request;
 555         char *info;
 556 {
 557         struct cu_data *cu;
 558         struct netbuf *addr;
 559 #ifdef _REENTRANT
 560         sigset_t mask;
 561 #endif
 562         sigset_t newmask;
 563
 564         _DIAGASSERT(cl != NULL);
 565         /* info is handled below */
 566
 567         cu = (struct cu_data *)cl->cl_private;
 568
 569         sigfillset(&newmask);
 570         thr_sigsetmask(SIG_SETMASK, &newmask, &mask);
 571         mutex_lock(&clnt_fd_lock);
 572         while (dg_fd_locks[cu->cu_fd])
 573                 cond_wait(&dg_cv[cu->cu_fd], &clnt_fd_lock);
 574         dg_fd_locks[cu->cu_fd] = __rpc_lock_value;
 575         mutex_unlock(&clnt_fd_lock);
 576         switch (request) {
 577         case CLSET_FD_CLOSE:
 578                 cu->cu_closeit = TRUE;
 579                 release_fd_lock(cu->cu_fd, mask);
 580                 return (TRUE);
 581         case CLSET_FD_NCLOSE:
 582                 cu->cu_closeit = FALSE;
 583                 release_fd_lock(cu->cu_fd, mask);
 584                 return (TRUE);
 585         }
 586
 587         /* for other requests which use info */
 588         if (info == NULL) {
 589                 release_fd_lock(cu->cu_fd, mask);
 590                 return (FALSE);
 591         }
 592         switch (request) {
 593         case CLSET_TIMEOUT:
 594                 if (time_not_ok((struct timeval *)(void *)info)) {
 595                         release_fd_lock(cu->cu_fd, mask);
 596                         return (FALSE);
 597                 }
 598                 cu->cu_total = *(struct timeval *)(void *)info;
 599                 break;
 600         case CLGET_TIMEOUT:
 601                 *(struct timeval *)(void *)info = cu->cu_total;
 602                 break;
 603         case CLGET_SERVER_ADDR:         /* Give him the fd address */
 604                 /* Now obsolete. Only for backward compatibility */
 605                 (void) memcpy(info, &cu->cu_raddr, (size_t)cu->cu_rlen);
 606                 break;
 607         case CLSET_RETRY_TIMEOUT:
 608                 if (time_not_ok((struct timeval *)(void *)info)) {
 609                         release_fd_lock(cu->cu_fd, mask);
 610                         return (FALSE);
 611                 }
 612                 cu->cu_wait = *(struct timeval *)(void *)info;
 613                 break;
 614         case CLGET_RETRY_TIMEOUT:
 615                 *(struct timeval *)(void *)info = cu->cu_wait;
 616                 break;
 617         case CLGET_FD:
 618                 *(int *)(void *)info = cu->cu_fd;
 619                 break;
 620         case CLGET_SVC_ADDR:
 621                 addr = (struct netbuf *)(void *)info;
 622                 addr->buf = &cu->cu_raddr;
 623                 addr->len = cu->cu_rlen;
 624                 addr->maxlen = sizeof cu->cu_raddr;
 625                 break;
 626         case CLSET_SVC_ADDR:            /* set to new address */
 627                 addr = (struct netbuf *)(void *)info;
 628                 if (addr->len < sizeof cu->cu_raddr) {
 629                         release_fd_lock(cu->cu_fd, mask);
 630                         return (FALSE);
 631                 }
 632                 (void) memcpy(&cu->cu_raddr, addr->buf, (size_t)addr->len);
 633                 cu->cu_rlen = addr->len;
 634                 break;
 635         case CLGET_XID:
 636                 /*
 637                  * use the knowledge that xid is the
 638                  * first element in the call structure *.
 639                  * This will get the xid of the PREVIOUS call
 640                  */
 641                 *(u_int32_t *)(void *)info =
 642                     ntohl(*(u_int32_t *)(void *)cu->cu_outbuf);
 643                 break;
 644
 645         case CLSET_XID:
 646                 /* This will set the xid of the NEXT call */
 647                 *(u_int32_t *)(void *)cu->cu_outbuf =
 648                     htonl(*(u_int32_t *)(void *)info - 1);
 649                 /* decrement by 1 as clnt_dg_call() increments once */
 650                 break;
 651
 652         case CLGET_VERS:
 653                 /*
 654                  * This RELIES on the information that, in the call body,
 655                  * the version number field is the fifth field from the
 656                  * begining of the RPC header. MUST be changed if the
 657                  * call_struct is changed
 658                  */
 659                 *(u_int32_t *)(void *)info =
 660                     ntohl(*(u_int32_t *)(void *)(cu->cu_outbuf +
 661                     4 * BYTES_PER_XDR_UNIT));
 662                 break;
 663
 664         case CLSET_VERS:
 665                 *(u_int32_t *)(void *)(cu->cu_outbuf + 4 * BYTES_PER_XDR_UNIT)
 666                         = htonl(*(u_int32_t *)(void *)info);
 667                 break;
 668
 669         case CLGET_PROG:
 670                 /*
 671                  * This RELIES on the information that, in the call body,
 672                  * the program number field is the fourth field from the
 673                  * begining of the RPC header. MUST be changed if the
 674                  * call_struct is changed
 675                  */
 676                 *(u_int32_t *)(void *)info =
 677                     ntohl(*(u_int32_t *)(void *)(cu->cu_outbuf +
 678                     3 * BYTES_PER_XDR_UNIT));
 679                 break;
 680
 681         case CLSET_PROG:
 682                 *(u_int32_t *)(void *)(cu->cu_outbuf + 3 * BYTES_PER_XDR_UNIT)
 683                         = htonl(*(u_int32_t *)(void *)info);
 684                 break;
 685
 686         default:
 687                 release_fd_lock(cu->cu_fd, mask);
 688                 return (FALSE);
 689         }
 690         release_fd_lock(cu->cu_fd, mask);
 691         return (TRUE);
 692 }
 693
 694 static void
 695 clnt_dg_destroy(cl)
 696         CLIENT *cl;
 697 {
 698         struct cu_data *cu;
 699         int cu_fd;
 700 #ifdef _REENTRANT
 701         sigset_t mask;
 702 #endif
 703         sigset_t newmask;
 704
 705         _DIAGASSERT(cl != NULL);
 706
 707         cu = (struct cu_data *)cl->cl_private;
 708         cu_fd = cu->cu_fd;
 709
 710         sigfillset(&newmask);
 711         thr_sigsetmask(SIG_SETMASK, &newmask, &mask);
 712         mutex_lock(&clnt_fd_lock);
 713         while (dg_fd_locks[cu_fd])
 714                 cond_wait(&dg_cv[cu_fd], &clnt_fd_lock);
 715         if (cu->cu_closeit)
 716                 (void) close(cu_fd);
 717         XDR_DESTROY(&(cu->cu_outxdrs));
 718         mem_free(cu, (sizeof (*cu) + cu->cu_sendsz + cu->cu_recvsz));
 719         if (cl->cl_netid && cl->cl_netid[0])
 720                 mem_free(cl->cl_netid, strlen(cl->cl_netid) +1);
 721         if (cl->cl_tp && cl->cl_tp[0])
 722                 mem_free(cl->cl_tp, strlen(cl->cl_tp) +1);
 723         mem_free(cl, sizeof (CLIENT));
 724         mutex_unlock(&clnt_fd_lock);
 725         thr_sigsetmask(SIG_SETMASK, &mask, NULL);
 726         cond_signal(&dg_cv[cu_fd]);
 727 }
 728
 729 static struct clnt_ops *
 730 clnt_dg_ops()
 731 {
 732         static struct clnt_ops ops;
 733 #ifdef _REENTRANT
 734         extern mutex_t  ops_lock;
 735         sigset_t mask;
 736 #endif
 737         sigset_t newmask;
 738
 739 /* VARIABLES PROTECTED BY ops_lock: ops */
 740
 741         sigfillset(&newmask);
 742         thr_sigsetmask(SIG_SETMASK, &newmask, &mask);
 743         mutex_lock(&ops_lock);
 744         if (ops.cl_call == NULL) {
 745                 ops.cl_call = clnt_dg_call;
 746                 ops.cl_abort = clnt_dg_abort;
 747                 ops.cl_geterr = clnt_dg_geterr;
 748                 ops.cl_freeres = clnt_dg_freeres;
 749                 ops.cl_destroy = clnt_dg_destroy;
 750                 ops.cl_control = clnt_dg_control;
 751         }
 752         mutex_unlock(&ops_lock);
 753         thr_sigsetmask(SIG_SETMASK, &mask, NULL);
 754         return (&ops);
 755 }
 756
 757 /*
 758  * Make sure that the time is not garbage.  -1 value is allowed.
 759  */
 760 static bool_t
 761 time_not_ok(t)
 762         struct timeval *t;
 763 {
 764
 765         _DIAGASSERT(t != NULL);
 766
 767         return (t->tv_sec < -1 || t->tv_sec > 100000000 ||
 768                 t->tv_usec < -1 || t->tv_usec > 1000000);
 769 }