lib/libc/rpc/svc_vc.c

   1 /*      $NetBSD: svc_vc.c,v 1.22 2009/02/12 04:38:52 lukem 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 #include <sys/cdefs.h>
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 #if 0
  35 static char *sccsid = "@(#)svc_tcp.c 1.21 87/08/11 Copyr 1984 Sun Micro";
  36 static char *sccsid = "@(#)svc_tcp.c    2.2 88/08/01 4.0 RPCSRC";
  37 #else
  38 __RCSID("$NetBSD: svc_vc.c,v 1.22 2009/02/12 04:38:52 lukem Exp $");
  39 #endif
  40 #endif
  41
  42 /*
  43  * svc_vc.c, Server side for Connection Oriented based RPC.
  44  *
  45  * Actually implements two flavors of transporter -
  46  * a tcp rendezvouser (a listner and connection establisher)
  47  * and a record/tcp stream.
  48  */
  49
  50 #include "namespace.h"
  51 #include "reentrant.h"
  52 #include <sys/types.h>
  53 #include <sys/param.h>
  54 #include <sys/poll.h>
  55 #include <sys/socket.h>
  56 #include <sys/un.h>
  57 #include <sys/time.h>
  58 #include <netinet/in.h>
  59
  60 #include <assert.h>
  61 #include <err.h>
  62 #include <errno.h>
  63 #include <fcntl.h>
  64 #include <stdio.h>
  65 #include <stdlib.h>
  66 #include <string.h>
  67 #include <unistd.h>
  68
  69 #include <rpc/rpc.h>
  70
  71 #include "rpc_internal.h"
  72
  73 #ifdef __weak_alias
  74 __weak_alias(svc_fd_create,_svc_fd_create)
  75 __weak_alias(svc_vc_create,_svc_vc_create)
  76 #endif
  77
  78 #ifdef _REENTRANT
  79 extern rwlock_t svc_fd_lock;
  80 #endif
  81
  82 static SVCXPRT *makefd_xprt __P((int, u_int, u_int));
  83 static bool_t rendezvous_request __P((SVCXPRT *, struct rpc_msg *));
  84 static enum xprt_stat rendezvous_stat __P((SVCXPRT *));
  85 static void svc_vc_destroy __P((SVCXPRT *));
  86 static void __svc_vc_dodestroy __P((SVCXPRT *));
  87 static int read_vc __P((caddr_t, caddr_t, int));
  88 static int write_vc __P((caddr_t, caddr_t, int));
  89 static enum xprt_stat svc_vc_stat __P((SVCXPRT *));
  90 static bool_t svc_vc_recv __P((SVCXPRT *, struct rpc_msg *));
  91 static bool_t svc_vc_getargs __P((SVCXPRT *, xdrproc_t, caddr_t));
  92 static bool_t svc_vc_freeargs __P((SVCXPRT *, xdrproc_t, caddr_t));
  93 static bool_t svc_vc_reply __P((SVCXPRT *, struct rpc_msg *));
  94 static void svc_vc_rendezvous_ops __P((SVCXPRT *));
  95 static void svc_vc_ops __P((SVCXPRT *));
  96 static bool_t svc_vc_control __P((SVCXPRT *, const u_int, void *));
  97 static bool_t svc_vc_rendezvous_control __P((SVCXPRT *, const u_int,
  98                                              void *));
  99
 100 struct cf_rendezvous { /* kept in xprt->xp_p1 for rendezvouser */
 101         u_int sendsize;
 102         u_int recvsize;
 103         int maxrec;
 104 };
 105
 106 struct cf_conn {  /* kept in xprt->xp_p1 for actual connection */
 107         enum xprt_stat strm_stat;
 108         u_int32_t x_id;
 109         XDR xdrs;
 110         char verf_body[MAX_AUTH_BYTES];
 111         u_int sendsize;
 112         u_int recvsize;
 113         int maxrec;
 114         bool_t nonblock;
 115         struct timeval last_recv_time;
 116 };
 117
 118 /*
 119  * Usage:
 120  *      xprt = svc_vc_create(sock, send_buf_size, recv_buf_size);
 121  *
 122  * Creates, registers, and returns a (rpc) tcp based transporter.
 123  * Once *xprt is initialized, it is registered as a transporter
 124  * see (svc.h, xprt_register).  This routine returns
 125  * a NULL if a problem occurred.
 126  *
 127  * The filedescriptor passed in is expected to refer to a bound, but
 128  * not yet connected socket.
 129  *
 130  * Since streams do buffered io similar to stdio, the caller can specify
 131  * how big the send and receive buffers are via the second and third parms;
 132  * 0 => use the system default.
 133  */
 134 SVCXPRT *
 135 svc_vc_create(fd, sendsize, recvsize)
 136         int fd;
 137         u_int sendsize;
 138         u_int recvsize;
 139 {
 140         SVCXPRT *xprt;
 141         struct cf_rendezvous *r = NULL;
 142         struct __rpc_sockinfo si;
 143         struct sockaddr_storage sslocal;
 144         socklen_t slen;
 145         int one = 1;
 146
 147         if (!__rpc_fd2sockinfo(fd, &si))
 148                 return NULL;
 149
 150         r = mem_alloc(sizeof(*r));
 151         if (r == NULL) {
 152                 warnx("svc_vc_create: out of memory");
 153                 return NULL;
 154         }
 155         r->sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize);
 156         r->recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize);
 157         r->maxrec = __svc_maxrec;
 158         xprt = mem_alloc(sizeof(SVCXPRT));
 159         if (xprt == NULL) {
 160                 warnx("svc_vc_create: out of memory");
 161                 goto cleanup_svc_vc_create;
 162         }
 163         xprt->xp_tp = NULL;
 164         xprt->xp_p1 = (caddr_t)(void *)r;
 165         xprt->xp_p2 = NULL;
 166         xprt->xp_p3 = NULL;
 167         xprt->xp_verf = _null_auth;
 168         svc_vc_rendezvous_ops(xprt);
 169         xprt->xp_port = (u_short)-1;    /* It is the rendezvouser */
 170         xprt->xp_fd = fd;
 171
 172         slen = sizeof (struct sockaddr_storage);
 173         if (getsockname(fd, (struct sockaddr *)(void *)&sslocal, &slen) < 0) {
 174                 warnx("svc_vc_create: could not retrieve local addr");
 175                 goto cleanup_svc_vc_create;
 176         }
 177
 178         /*
 179          * We want to be able to check credentials on local sockets.
 180          */
 181         if (sslocal.ss_family == AF_LOCAL)
 182                 if (setsockopt(fd, 0, LOCAL_CREDS, &one, sizeof one) < 0)
 183                         goto cleanup_svc_vc_create;
 184
 185         xprt->xp_ltaddr.maxlen = xprt->xp_ltaddr.len = sslocal.ss_len;
 186         xprt->xp_ltaddr.buf = mem_alloc((size_t)sslocal.ss_len);
 187         if (xprt->xp_ltaddr.buf == NULL) {
 188                 warnx("svc_vc_create: no mem for local addr");
 189                 goto cleanup_svc_vc_create;
 190         }
 191         memcpy(xprt->xp_ltaddr.buf, &sslocal, (size_t)sslocal.ss_len);
 192
 193         xprt->xp_rtaddr.maxlen = sizeof (struct sockaddr_storage);
 194         xprt_register(xprt);
 195         return (xprt);
 196 cleanup_svc_vc_create:
 197         if (xprt)
 198                 mem_free(xprt, sizeof(*xprt));
 199         if (r != NULL)
 200                 mem_free(r, sizeof(*r));
 201         return (NULL);
 202 }
 203
 204 /*
 205  * Like svtcp_create(), except the routine takes any *open* UNIX file
 206  * descriptor as its first input.
 207  */
 208 SVCXPRT *
 209 svc_fd_create(fd, sendsize, recvsize)
 210         int fd;
 211         u_int sendsize;
 212         u_int recvsize;
 213 {
 214         struct sockaddr_storage ss;
 215         socklen_t slen;
 216         SVCXPRT *ret;
 217
 218         _DIAGASSERT(fd != -1);
 219
 220         ret = makefd_xprt(fd, sendsize, recvsize);
 221         if (ret == NULL)
 222                 return NULL;
 223
 224         slen = sizeof (struct sockaddr_storage);
 225         if (getsockname(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) {
 226                 warnx("svc_fd_create: could not retrieve local addr");
 227                 goto freedata;
 228         }
 229         ret->xp_ltaddr.maxlen = ret->xp_ltaddr.len = ss.ss_len;
 230         ret->xp_ltaddr.buf = mem_alloc((size_t)ss.ss_len);
 231         if (ret->xp_ltaddr.buf == NULL) {
 232                 warnx("svc_fd_create: no mem for local addr");
 233                 goto freedata;
 234         }
 235         memcpy(ret->xp_ltaddr.buf, &ss, (size_t)ss.ss_len);
 236
 237         slen = sizeof (struct sockaddr_storage);
 238         if (getpeername(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) {
 239                 warnx("svc_fd_create: could not retrieve remote addr");
 240                 goto freedata;
 241         }
 242         ret->xp_rtaddr.maxlen = ret->xp_rtaddr.len = ss.ss_len;
 243         ret->xp_rtaddr.buf = mem_alloc((size_t)ss.ss_len);
 244         if (ret->xp_rtaddr.buf == NULL) {
 245                 warnx("svc_fd_create: no mem for local addr");
 246                 goto freedata;
 247         }
 248         memcpy(ret->xp_rtaddr.buf, &ss, (size_t)ss.ss_len);
 249 #ifdef PORTMAP
 250         if (ss.ss_family == AF_INET) {
 251                 ret->xp_raddr = *(struct sockaddr_in *)ret->xp_rtaddr.buf;
 252                 ret->xp_addrlen = sizeof (struct sockaddr_in);
 253         }
 254 #endif
 255
 256         return ret;
 257
 258 freedata:
 259         if (ret->xp_ltaddr.buf != NULL)
 260                 mem_free(ret->xp_ltaddr.buf, rep->xp_ltaddr.maxlen);
 261
 262         return NULL;
 263 }
 264
 265 static SVCXPRT *
 266 makefd_xprt(fd, sendsize, recvsize)
 267         int fd;
 268         u_int sendsize;
 269         u_int recvsize;
 270 {
 271         SVCXPRT *xprt;
 272         struct cf_conn *cd;
 273         const char *netid;
 274         struct __rpc_sockinfo si;
 275
 276         _DIAGASSERT(fd != -1);
 277
 278         xprt = mem_alloc(sizeof(SVCXPRT));
 279         if (xprt == NULL)
 280                 goto out;
 281         memset(xprt, 0, sizeof *xprt);
 282         cd = mem_alloc(sizeof(struct cf_conn));
 283         if (cd == NULL)
 284                 goto out;
 285         cd->strm_stat = XPRT_IDLE;
 286         xdrrec_create(&(cd->xdrs), sendsize, recvsize,
 287             (caddr_t)(void *)xprt, read_vc, write_vc);
 288         xprt->xp_p1 = (caddr_t)(void *)cd;
 289         xprt->xp_verf.oa_base = cd->verf_body;
 290         svc_vc_ops(xprt);  /* truely deals with calls */
 291         xprt->xp_port = 0;  /* this is a connection, not a rendezvouser */
 292         xprt->xp_fd = fd;
 293         if (__rpc_fd2sockinfo(fd, &si) && __rpc_sockinfo2netid(&si, &netid))
 294                 if ((xprt->xp_netid = strdup(netid)) == NULL)
 295                         goto out;
 296
 297         xprt_register(xprt);
 298         return (xprt);
 299 out:
 300         warn("svc_tcp: makefd_xprt");
 301         if (xprt)
 302                 mem_free(xprt, sizeof(SVCXPRT));
 303         return NULL;
 304 }
 305
 306 /*ARGSUSED*/
 307 static bool_t
 308 rendezvous_request(xprt, msg)
 309         SVCXPRT *xprt;
 310         struct rpc_msg *msg;
 311 {
 312         int sock, flags;
 313         struct cf_rendezvous *r;
 314         struct cf_conn *cd;
 315         struct sockaddr_storage addr;
 316         socklen_t len;
 317         struct __rpc_sockinfo si;
 318         SVCXPRT *newxprt;
 319         fd_set cleanfds;
 320
 321         _DIAGASSERT(xprt != NULL);
 322         _DIAGASSERT(msg != NULL);
 323
 324         r = (struct cf_rendezvous *)xprt->xp_p1;
 325 again:
 326         len = sizeof addr;
 327         if ((sock = accept(xprt->xp_fd, (struct sockaddr *)(void *)&addr,
 328             &len)) < 0) {
 329                 if (errno == EINTR)
 330                         goto again;
 331                 /*
 332                  * Clean out the most idle file descriptor when we're
 333                  * running out.
 334                  */
 335                 if (errno == EMFILE || errno == ENFILE) {
 336                         cleanfds = svc_fdset;
 337                         if (__svc_clean_idle(&cleanfds, 0, FALSE))
 338                                 goto again;
 339                 }
 340                 return (FALSE);
 341         }
 342         /*
 343          * make a new transporter (re-uses xprt)
 344          */
 345         newxprt = makefd_xprt(sock, r->sendsize, r->recvsize);
 346         if (newxprt == NULL)
 347                 goto out;
 348         newxprt->xp_rtaddr.buf = mem_alloc(len);
 349         if (newxprt->xp_rtaddr.buf == NULL)
 350                 goto out;
 351         memcpy(newxprt->xp_rtaddr.buf, &addr, len);
 352         newxprt->xp_rtaddr.len = len;
 353 #ifdef PORTMAP
 354         if (addr.ss_family == AF_INET) {
 355                 newxprt->xp_raddr = *(struct sockaddr_in *)newxprt->xp_rtaddr.buf;
 356                 newxprt->xp_addrlen = sizeof (struct sockaddr_in);
 357         }
 358 #endif
 359         if (__rpc_fd2sockinfo(sock, &si))
 360                 __rpc_setnodelay(sock, &si);
 361
 362         cd = (struct cf_conn *)newxprt->xp_p1;
 363
 364         cd->recvsize = r->recvsize;
 365         cd->sendsize = r->sendsize;
 366         cd->maxrec = r->maxrec;
 367
 368         if (cd->maxrec != 0) {
 369                 flags = fcntl(sock, F_GETFL, 0);
 370                 if (flags  == -1)
 371                         goto out;
 372                 if (fcntl(sock, F_SETFL, flags | O_NONBLOCK) == -1)
 373                         goto out;
 374                 if (cd->recvsize > (u_int)cd->maxrec)
 375                         cd->recvsize = cd->maxrec;
 376                 cd->nonblock = TRUE;
 377                 __xdrrec_setnonblock(&cd->xdrs, cd->maxrec);
 378         } else
 379                 cd->nonblock = FALSE;
 380
 381         (void)gettimeofday(&cd->last_recv_time, NULL);
 382
 383         return (FALSE); /* there is never an rpc msg to be processed */
 384 out:
 385         (void)close(sock);
 386         return (FALSE); /* there was an error */
 387 }
 388
 389 /*ARGSUSED*/
 390 static enum xprt_stat
 391 rendezvous_stat(xprt)
 392         SVCXPRT *xprt;
 393 {
 394
 395         return (XPRT_IDLE);
 396 }
 397
 398 static void
 399 svc_vc_destroy(xprt)
 400         SVCXPRT *xprt;
 401 {
 402         _DIAGASSERT(xprt != NULL);
 403
 404         xprt_unregister(xprt);
 405         __svc_vc_dodestroy(xprt);
 406 }
 407
 408 static void
 409 __svc_vc_dodestroy(xprt)
 410         SVCXPRT *xprt;
 411 {
 412         struct cf_conn *cd;
 413         struct cf_rendezvous *r;
 414
 415         cd = (struct cf_conn *)xprt->xp_p1;
 416
 417         if (xprt->xp_fd != RPC_ANYFD)
 418                 (void)close(xprt->xp_fd);
 419         if (xprt->xp_port != 0) {
 420                 /* a rendezvouser socket */
 421                 r = (struct cf_rendezvous *)xprt->xp_p1;
 422                 mem_free(r, sizeof (struct cf_rendezvous));
 423                 xprt->xp_port = 0;
 424         } else {
 425                 /* an actual connection socket */
 426                 XDR_DESTROY(&(cd->xdrs));
 427                 mem_free(cd, sizeof(struct cf_conn));
 428         }
 429         if (xprt->xp_rtaddr.buf)
 430                 mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.maxlen);
 431         if (xprt->xp_ltaddr.buf)
 432                 mem_free(xprt->xp_ltaddr.buf, xprt->xp_ltaddr.maxlen);
 433         if (xprt->xp_tp)
 434                 free(xprt->xp_tp);
 435         if (xprt->xp_netid)
 436                 free(xprt->xp_netid);
 437         mem_free(xprt, sizeof(SVCXPRT));
 438 }
 439
 440 /*ARGSUSED*/
 441 static bool_t
 442 svc_vc_control(xprt, rq, in)
 443         SVCXPRT *xprt;
 444         const u_int rq;
 445         void *in;
 446 {
 447         return (FALSE);
 448 }
 449
 450 /*ARGSUSED*/
 451 static bool_t
 452 svc_vc_rendezvous_control(xprt, rq, in)
 453         SVCXPRT *xprt;
 454         const u_int rq;
 455         void *in;
 456 {
 457         struct cf_rendezvous *cfp;
 458
 459         cfp = (struct cf_rendezvous *)xprt->xp_p1;
 460         if (cfp == NULL)
 461                 return (FALSE);
 462         switch (rq) {
 463                 case SVCGET_CONNMAXREC:
 464                         *(int *)in = cfp->maxrec;
 465                         break;
 466                 case SVCSET_CONNMAXREC:
 467                         cfp->maxrec = *(int *)in;
 468                         break;
 469                 default:
 470                         return (FALSE);
 471         }
 472         return (TRUE);
 473 }
 474
 475 /*
 476  * reads data from the tcp connection.
 477  * any error is fatal and the connection is closed.
 478  * (And a read of zero bytes is a half closed stream => error.)
 479  * All read operations timeout after 35 seconds.  A timeout is
 480  * fatal for the connection.
 481  */
 482 static int
 483 read_vc(xprtp, buf, len)
 484         caddr_t xprtp;
 485         caddr_t buf;
 486         int len;
 487 {
 488         SVCXPRT *xprt;
 489         int sock;
 490         struct pollfd pollfd;
 491         struct sockaddr *sa;
 492         struct msghdr msg;
 493         struct cmsghdr *cmp;
 494         void *crmsg = NULL;
 495         struct sockcred *sc;
 496         socklen_t crmsgsize;
 497         struct cf_conn *cfp;
 498         static const struct timespec ts = { 35, 0 };
 499
 500         xprt = (SVCXPRT *)(void *)xprtp;
 501         _DIAGASSERT(xprt != NULL);
 502
 503         sock = xprt->xp_fd;
 504
 505         sa = (struct sockaddr *)xprt->xp_rtaddr.buf;
 506         if (sa->sa_family == AF_LOCAL && xprt->xp_p2 == NULL) {
 507                 memset(&msg, 0, sizeof msg);
 508                 crmsgsize = CMSG_SPACE(SOCKCREDSIZE(NGROUPS));
 509                 crmsg = malloc(crmsgsize);
 510                 if (crmsg == NULL)
 511                         goto fatal_err;
 512                 memset(crmsg, 0, crmsgsize);
 513
 514                 msg.msg_control = crmsg;
 515                 msg.msg_controllen = crmsgsize;
 516
 517                 if (recvmsg(sock, &msg, 0) < 0)
 518                         goto fatal_err;
 519
 520                 if (msg.msg_controllen == 0 ||
 521                     (msg.msg_flags & MSG_CTRUNC) != 0)
 522                         goto fatal_err;
 523
 524                 cmp = CMSG_FIRSTHDR(&msg);
 525                 if (cmp->cmsg_level != SOL_SOCKET ||
 526                     cmp->cmsg_type != SCM_CREDS)
 527                         goto fatal_err;
 528
 529                 sc = (struct sockcred *)(void *)CMSG_DATA(cmp);
 530
 531                 xprt->xp_p2 = mem_alloc(SOCKCREDSIZE(sc->sc_ngroups));
 532                 if (xprt->xp_p2 == NULL)
 533                         goto fatal_err;
 534
 535                 memcpy(xprt->xp_p2, sc, SOCKCREDSIZE(sc->sc_ngroups));
 536                 free(crmsg);
 537                 crmsg = NULL;
 538         }
 539
 540         cfp = (struct cf_conn *)xprt->xp_p1;
 541
 542         if (cfp->nonblock) {
 543                 len = read(sock, buf, (size_t)len);
 544                 if (len < 0) {
 545                         if (errno == EAGAIN)
 546                                 len = 0;
 547                         else
 548                                 goto fatal_err;
 549                 }
 550                 if (len != 0)
 551                         gettimeofday(&cfp->last_recv_time, NULL);
 552                 return len;
 553         }
 554
 555         do {
 556                 pollfd.fd = sock;
 557                 pollfd.events = POLLIN;
 558                 switch (pollts(&pollfd, 1, &ts, NULL)) {
 559                 case -1:
 560                         if (errno == EINTR) {
 561                                 continue;
 562                         }
 563                         /*FALLTHROUGH*/
 564                 case 0:
 565                         goto fatal_err;
 566
 567                 default:
 568                         break;
 569                 }
 570         } while ((pollfd.revents & POLLIN) == 0);
 571
 572         if ((len = read(sock, buf, (size_t)len)) > 0) {
 573                 gettimeofday(&cfp->last_recv_time, NULL);
 574                 return (len);
 575         }
 576
 577 fatal_err:
 578         if (crmsg != NULL)
 579                 free(crmsg);
 580         ((struct cf_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;
 581         return (-1);
 582 }
 583
 584 /*
 585  * writes data to the tcp connection.
 586  * Any error is fatal and the connection is closed.
 587  */
 588 static int
 589 write_vc(xprtp, buf, len)
 590         caddr_t xprtp;
 591         caddr_t buf;
 592         int len;
 593 {
 594         SVCXPRT *xprt;
 595         int i, cnt;
 596         struct cf_conn *cd;
 597         struct timeval tv0, tv1;
 598
 599         xprt = (SVCXPRT *)(void *)xprtp;
 600         _DIAGASSERT(xprt != NULL);
 601
 602         cd = (struct cf_conn *)xprt->xp_p1;
 603
 604         if (cd->nonblock)
 605                 gettimeofday(&tv0, NULL);
 606
 607         for (cnt = len; cnt > 0; cnt -= i, buf += i) {
 608                 if ((i = write(xprt->xp_fd, buf, (size_t)cnt)) < 0) {
 609                         if (errno != EAGAIN || !cd->nonblock) {
 610                                 cd->strm_stat = XPRT_DIED;
 611                                 return (-1);
 612                         }
 613                         if (cd->nonblock && i != cnt) {
 614                                 /*
 615                                  * For non-blocking connections, do not
 616                                  * take more than 2 seconds writing the
 617                                  * data out.
 618                                  *
 619                                  * XXX 2 is an arbitrary amount.
 620                                  */
 621                                 gettimeofday(&tv1, NULL);
 622                                 if (tv1.tv_sec - tv0.tv_sec >= 2) {
 623                                         cd->strm_stat = XPRT_DIED;
 624                                         return (-1);
 625                                 }
 626                         }
 627                 }
 628         }
 629         return (len);
 630 }
 631
 632 static enum xprt_stat
 633 svc_vc_stat(xprt)
 634         SVCXPRT *xprt;
 635 {
 636         struct cf_conn *cd;
 637
 638         _DIAGASSERT(xprt != NULL);
 639
 640         cd = (struct cf_conn *)(xprt->xp_p1);
 641
 642         if (cd->strm_stat == XPRT_DIED)
 643                 return (XPRT_DIED);
 644         if (! xdrrec_eof(&(cd->xdrs)))
 645                 return (XPRT_MOREREQS);
 646         return (XPRT_IDLE);
 647 }
 648
 649 static bool_t
 650 svc_vc_recv(xprt, msg)
 651         SVCXPRT *xprt;
 652         struct rpc_msg *msg;
 653 {
 654         struct cf_conn *cd;
 655         XDR *xdrs;
 656
 657         _DIAGASSERT(xprt != NULL);
 658         _DIAGASSERT(msg != NULL);
 659
 660         cd = (struct cf_conn *)(xprt->xp_p1);
 661         xdrs = &(cd->xdrs);
 662
 663         if (cd->nonblock) {
 664                 if (!__xdrrec_getrec(xdrs, &cd->strm_stat, TRUE))
 665                         return FALSE;
 666         }
 667
 668         xdrs->x_op = XDR_DECODE;
 669         (void)xdrrec_skiprecord(xdrs);
 670
 671         if (xdr_callmsg(xdrs, msg)) {
 672                 cd->x_id = msg->rm_xid;
 673                 return (TRUE);
 674         }
 675         cd->strm_stat = XPRT_DIED;
 676         return (FALSE);
 677 }
 678
 679 static bool_t
 680 svc_vc_getargs(xprt, xdr_args, args_ptr)
 681         SVCXPRT *xprt;
 682         xdrproc_t xdr_args;
 683         caddr_t args_ptr;
 684 {
 685
 686         _DIAGASSERT(xprt != NULL);
 687         /* args_ptr may be NULL */
 688
 689         return ((*xdr_args)(&(((struct cf_conn *)(xprt->xp_p1))->xdrs),
 690             args_ptr));
 691 }
 692
 693 static bool_t
 694 svc_vc_freeargs(xprt, xdr_args, args_ptr)
 695         SVCXPRT *xprt;
 696         xdrproc_t xdr_args;
 697         caddr_t args_ptr;
 698 {
 699         XDR *xdrs;
 700
 701         _DIAGASSERT(xprt != NULL);
 702         /* args_ptr may be NULL */
 703
 704         xdrs = &(((struct cf_conn *)(xprt->xp_p1))->xdrs);
 705
 706         xdrs->x_op = XDR_FREE;
 707         return ((*xdr_args)(xdrs, args_ptr));
 708 }
 709
 710 static bool_t
 711 svc_vc_reply(xprt, msg)
 712         SVCXPRT *xprt;
 713         struct rpc_msg *msg;
 714 {
 715         struct cf_conn *cd;
 716         XDR *xdrs;
 717         bool_t rstat;
 718
 719         _DIAGASSERT(xprt != NULL);
 720         _DIAGASSERT(msg != NULL);
 721
 722         cd = (struct cf_conn *)(xprt->xp_p1);
 723         xdrs = &(cd->xdrs);
 724
 725         xdrs->x_op = XDR_ENCODE;
 726         msg->rm_xid = cd->x_id;
 727         rstat = xdr_replymsg(xdrs, msg);
 728         (void)xdrrec_endofrecord(xdrs, TRUE);
 729         return (rstat);
 730 }
 731
 732 static void
 733 svc_vc_ops(xprt)
 734         SVCXPRT *xprt;
 735 {
 736         static struct xp_ops ops;
 737         static struct xp_ops2 ops2;
 738 #ifdef _REENTRANT
 739         extern mutex_t ops_lock;
 740 #endif
 741
 742 /* VARIABLES PROTECTED BY ops_lock: ops, ops2 */
 743
 744         mutex_lock(&ops_lock);
 745         if (ops.xp_recv == NULL) {
 746                 ops.xp_recv = svc_vc_recv;
 747                 ops.xp_stat = svc_vc_stat;
 748                 ops.xp_getargs = svc_vc_getargs;
 749                 ops.xp_reply = svc_vc_reply;
 750                 ops.xp_freeargs = svc_vc_freeargs;
 751                 ops.xp_destroy = svc_vc_destroy;
 752                 ops2.xp_control = svc_vc_control;
 753         }
 754         xprt->xp_ops = &ops;
 755         xprt->xp_ops2 = &ops2;
 756         mutex_unlock(&ops_lock);
 757 }
 758
 759 static void
 760 svc_vc_rendezvous_ops(xprt)
 761         SVCXPRT *xprt;
 762 {
 763         static struct xp_ops ops;
 764         static struct xp_ops2 ops2;
 765 #ifdef _REENTRANT
 766         extern mutex_t ops_lock;
 767 #endif
 768 /* XXXGCC vax compiler unhappy otherwise */
 769 #ifdef __vax__
 770 extern void abort(void);
 771 #endif
 772
 773         mutex_lock(&ops_lock);
 774         if (ops.xp_recv == NULL) {
 775                 ops.xp_recv = rendezvous_request;
 776                 ops.xp_stat = rendezvous_stat;
 777                 ops.xp_getargs =
 778                     (bool_t (*) __P((SVCXPRT *, xdrproc_t, caddr_t)))abort;
 779                 ops.xp_reply =
 780                     (bool_t (*) __P((SVCXPRT *, struct rpc_msg *)))abort;
 781                 ops.xp_freeargs =
 782                     (bool_t (*) __P((SVCXPRT *, xdrproc_t, caddr_t)))abort;
 783                 ops.xp_destroy = svc_vc_destroy;
 784                 ops2.xp_control = svc_vc_rendezvous_control;
 785         }
 786         xprt->xp_ops = &ops;
 787         xprt->xp_ops2 = &ops2;
 788         mutex_unlock(&ops_lock);
 789 }
 790
 791 /*
 792  * Destroy xprts that have not have had any activity in 'timeout' seconds.
 793  * If 'cleanblock' is true, blocking connections (the default) are also
 794  * cleaned. If timeout is 0, the least active connection is picked.
 795  */
 796 bool_t
 797 __svc_clean_idle(fd_set *fds, int timeout, bool_t cleanblock)
 798 {
 799         int i, ncleaned;
 800         SVCXPRT *xprt, *least_active;
 801         struct timeval tv, tdiff, tmax;
 802         struct cf_conn *cd;
 803
 804         gettimeofday(&tv, NULL);
 805         tmax.tv_sec = tmax.tv_usec = 0;
 806         least_active = NULL;
 807         rwlock_wrlock(&svc_fd_lock);
 808         for (i = ncleaned = 0; i <= svc_maxfd; i++) {
 809                 if (FD_ISSET(i, fds)) {
 810                         xprt = __svc_xports[i];
 811                         if (xprt == NULL || xprt->xp_ops == NULL ||
 812                             xprt->xp_ops->xp_recv != svc_vc_recv)
 813                                 continue;
 814                         cd = (struct cf_conn *)xprt->xp_p1;
 815                         if (!cleanblock && !cd->nonblock)
 816                                 continue;
 817                         if (timeout == 0) {
 818                                 timersub(&tv, &cd->last_recv_time, &tdiff);
 819                                 if (timercmp(&tdiff, &tmax, >)) {
 820                                         tmax = tdiff;
 821                                         least_active = xprt;
 822                                 }
 823                                 continue;
 824                         }
 825                         if (tv.tv_sec - cd->last_recv_time.tv_sec > timeout) {
 826                                 __xprt_unregister_unlocked(xprt);
 827                                 __svc_vc_dodestroy(xprt);
 828                                 ncleaned++;
 829                         }
 830                 }
 831         }
 832         if (timeout == 0 && least_active != NULL) {
 833                 __xprt_unregister_unlocked(least_active);
 834                 __svc_vc_dodestroy(least_active);
 835                 ncleaned++;
 836         }
 837         rwlock_unlock(&svc_fd_lock);
 838         return ncleaned > 0 ? TRUE : FALSE;
 839 }