lib/libc/rpc/svc_vc.c

   1 /*      $NetBSD: svc_vc.c,v 1.30 2013/03/11 20:19:29 tron Exp $ */
   2
   3 /*
   4  * Copyright (c) 2010, Oracle America, Inc.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are
   8  * met:
   9  *
  10  *     * Redistributions of source code must retain the above copyright
  11  *       notice, this list of conditions and the following disclaimer.
  12  *     * Redistributions in binary form must reproduce the above
  13  *       copyright notice, this list of conditions and the following
  14  *       disclaimer in the documentation and/or other materials
  15  *       provided with the distribution.
  16  *     * Neither the name of the "Oracle America, Inc." nor the names of its
  17  *       contributors may be used to endorse or promote products derived
  18  *       from this software without specific prior written permission.
  19  *
  20  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  23  *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  24  *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  25  *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  27  *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28  *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  29  *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  30  *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include <sys/cdefs.h>
  35 #if defined(LIBC_SCCS) && !defined(lint)
  36 #if 0
  37 static char *sccsid = "@(#)svc_tcp.c 1.21 87/08/11 Copyr 1984 Sun Micro";
  38 static char *sccsid = "@(#)svc_tcp.c    2.2 88/08/01 4.0 RPCSRC";
  39 #else
  40 __RCSID("$NetBSD: svc_vc.c,v 1.30 2013/03/11 20:19:29 tron Exp $");
  41 #endif
  42 #endif
  43
  44 /*
  45  * svc_vc.c, Server side for Connection Oriented based RPC.
  46  *
  47  * Actually implements two flavors of transporter -
  48  * a tcp rendezvouser (a listner and connection establisher)
  49  * and a record/tcp stream.
  50  */
  51
  52 #include "namespace.h"
  53 #include "reentrant.h"
  54 #include <sys/types.h>
  55 #include <sys/param.h>
  56 #include <sys/poll.h>
  57 #include <sys/socket.h>
  58 #include <sys/un.h>
  59 #include <sys/time.h>
  60 #include <netinet/in.h>
  61
  62 #include <assert.h>
  63 #include <err.h>
  64 #include <errno.h>
  65 #include <fcntl.h>
  66 #include <stdio.h>
  67 #include <stdlib.h>
  68 #include <string.h>
  69 #include <unistd.h>
  70
  71 #include <rpc/rpc.h>
  72
  73 #include "svc_fdset.h"
  74 #include "rpc_internal.h"
  75
  76 #ifdef __weak_alias
  77 __weak_alias(svc_fd_create,_svc_fd_create)
  78 __weak_alias(svc_vc_create,_svc_vc_create)
  79 #endif
  80
  81 #ifdef _REENTRANT
  82 extern rwlock_t svc_fd_lock;
  83 #endif
  84
  85 static SVCXPRT *makefd_xprt(int, u_int, u_int);
  86 static bool_t rendezvous_request(SVCXPRT *, struct rpc_msg *);
  87 static enum xprt_stat rendezvous_stat(SVCXPRT *);
  88 static void svc_vc_destroy(SVCXPRT *);
  89 static void __svc_vc_dodestroy(SVCXPRT *);
  90 static int read_vc(caddr_t, caddr_t, int);
  91 static int write_vc(caddr_t, caddr_t, int);
  92 static enum xprt_stat svc_vc_stat(SVCXPRT *);
  93 static bool_t svc_vc_recv(SVCXPRT *, struct rpc_msg *);
  94 static bool_t svc_vc_getargs(SVCXPRT *, xdrproc_t, caddr_t);
  95 static bool_t svc_vc_freeargs(SVCXPRT *, xdrproc_t, caddr_t);
  96 static bool_t svc_vc_reply(SVCXPRT *, struct rpc_msg *);
  97 static void svc_vc_rendezvous_ops(SVCXPRT *);
  98 static void svc_vc_ops(SVCXPRT *);
  99 static bool_t svc_vc_control(SVCXPRT *, const u_int, void *);
 100 static bool_t svc_vc_rendezvous_control(SVCXPRT *, const u_int, void *);
 101
 102 struct cf_rendezvous { /* kept in xprt->xp_p1 for rendezvouser */
 103         u_int sendsize;
 104         u_int recvsize;
 105         int maxrec;
 106 };
 107
 108 struct cf_conn {  /* kept in xprt->xp_p1 for actual connection */
 109         enum xprt_stat strm_stat;
 110         u_int32_t x_id;
 111         XDR xdrs;
 112         char verf_body[MAX_AUTH_BYTES];
 113         u_int sendsize;
 114         u_int recvsize;
 115         int maxrec;
 116         bool_t nonblock;
 117         struct timeval last_recv_time;
 118 };
 119
 120 /*
 121  * Usage:
 122  *      xprt = svc_vc_create(sock, send_buf_size, recv_buf_size);
 123  *
 124  * Creates, registers, and returns a (rpc) tcp based transporter.
 125  * Once *xprt is initialized, it is registered as a transporter
 126  * see (svc.h, xprt_register).  This routine returns
 127  * a NULL if a problem occurred.
 128  *
 129  * The filedescriptor passed in is expected to refer to a bound, but
 130  * not yet connected socket.
 131  *
 132  * Since streams do buffered io similar to stdio, the caller can specify
 133  * how big the send and receive buffers are via the second and third parms;
 134  * 0 => use the system default.
 135  */
 136 SVCXPRT *
 137 svc_vc_create(int fd, u_int sendsize, u_int recvsize)
 138 {
 139         SVCXPRT *xprt;
 140         struct cf_rendezvous *r = NULL;
 141         struct __rpc_sockinfo si;
 142         struct sockaddr_storage sslocal;
 143         socklen_t slen;
 144         int one = 1;
 145
 146         if (!__rpc_fd2sockinfo(fd, &si))
 147                 return NULL;
 148
 149         r = mem_alloc(sizeof(*r));
 150         if (r == NULL) {
 151                 warn("%s: out of memory", __func__);
 152                 return NULL;
 153         }
 154         r->sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize);
 155         r->recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize);
 156         r->maxrec = __svc_maxrec;
 157         xprt = mem_alloc(sizeof(SVCXPRT));
 158         if (xprt == NULL) {
 159                 warn("%s: out of memory", __func__);
 160                 goto cleanup_svc_vc_create;
 161         }
 162         xprt->xp_tp = NULL;
 163         xprt->xp_p1 = (caddr_t)(void *)r;
 164         xprt->xp_p2 = NULL;
 165         xprt->xp_p3 = NULL;
 166         xprt->xp_verf = _null_auth;
 167         svc_vc_rendezvous_ops(xprt);
 168         xprt->xp_port = (u_short)-1;    /* It is the rendezvouser */
 169         xprt->xp_fd = fd;
 170
 171         slen = sizeof (struct sockaddr_storage);
 172         if (getsockname(fd, (struct sockaddr *)(void *)&sslocal, &slen) < 0) {
 173                 warn("%s: could not retrieve local addr", __func__);
 174                 goto cleanup_svc_vc_create;
 175         }
 176
 177         /*
 178          * We want to be able to check credentials on local sockets.
 179          */
 180         if (sslocal.ss_family == AF_LOCAL)
 181                 if (setsockopt(fd, 0, LOCAL_CREDS, &one, (socklen_t)sizeof one)
 182                     == -1)
 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                 warn("%s: out of memory", __func__);
 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         if (!xprt_register(xprt))
 195                 goto cleanup_svc_vc_create;
 196         return xprt;
 197 cleanup_svc_vc_create:
 198         if (xprt)
 199                 mem_free(xprt, sizeof(*xprt));
 200         if (r != NULL)
 201                 mem_free(r, sizeof(*r));
 202         return NULL;
 203 }
 204
 205 /*
 206  * Like svtcp_create(), except the routine takes any *open* UNIX file
 207  * descriptor as its first input.
 208  */
 209 SVCXPRT *
 210 svc_fd_create(int fd, u_int sendsize, u_int recvsize)
 211 {
 212         struct sockaddr_storage ss;
 213         socklen_t slen;
 214         SVCXPRT *ret;
 215
 216         _DIAGASSERT(fd != -1);
 217
 218         ret = makefd_xprt(fd, sendsize, recvsize);
 219         if (ret == NULL)
 220                 return NULL;
 221
 222         slen = sizeof (struct sockaddr_storage);
 223         if (getsockname(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) {
 224                 warn("%s: could not retrieve local addr", __func__);
 225                 goto freedata;
 226         }
 227         ret->xp_ltaddr.maxlen = ret->xp_ltaddr.len = ss.ss_len;
 228         ret->xp_ltaddr.buf = mem_alloc((size_t)ss.ss_len);
 229         if (ret->xp_ltaddr.buf == NULL) {
 230                 warn("%s: out of memory", __func__);
 231                 goto freedata;
 232         }
 233         memcpy(ret->xp_ltaddr.buf, &ss, (size_t)ss.ss_len);
 234
 235         slen = sizeof (struct sockaddr_storage);
 236         if (getpeername(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) {
 237                 warn("%s: could not retrieve remote addr", __func__);
 238                 goto freedata;
 239         }
 240         ret->xp_rtaddr.maxlen = ret->xp_rtaddr.len = ss.ss_len;
 241         ret->xp_rtaddr.buf = mem_alloc((size_t)ss.ss_len);
 242         if (ret->xp_rtaddr.buf == NULL) {
 243                 warn("%s: out of memory", __func__);
 244                 goto freedata;
 245         }
 246         memcpy(ret->xp_rtaddr.buf, &ss, (size_t)ss.ss_len);
 247 #ifdef PORTMAP
 248         if (ss.ss_family == AF_INET) {
 249                 ret->xp_raddr = *(struct sockaddr_in *)ret->xp_rtaddr.buf;
 250                 ret->xp_addrlen = sizeof (struct sockaddr_in);
 251         }
 252 #endif
 253
 254         return ret;
 255
 256 freedata:
 257         if (ret->xp_ltaddr.buf != NULL)
 258                 mem_free(ret->xp_ltaddr.buf, rep->xp_ltaddr.maxlen);
 259
 260         return NULL;
 261 }
 262
 263 static SVCXPRT *
 264 makefd_xprt(int fd, u_int sendsize, u_int recvsize)
 265 {
 266         SVCXPRT *xprt;
 267         struct cf_conn *cd;
 268         const char *netid;
 269         struct __rpc_sockinfo si;
 270
 271         _DIAGASSERT(fd != -1);
 272
 273         xprt = mem_alloc(sizeof(SVCXPRT));
 274         if (xprt == NULL)
 275                 goto outofmem;
 276         memset(xprt, 0, sizeof *xprt);
 277         cd = mem_alloc(sizeof(struct cf_conn));
 278         if (cd == NULL)
 279                 goto outofmem;
 280         cd->strm_stat = XPRT_IDLE;
 281         xdrrec_create(&(cd->xdrs), sendsize, recvsize,
 282             (caddr_t)(void *)xprt, read_vc, write_vc);
 283         xprt->xp_p1 = (caddr_t)(void *)cd;
 284         xprt->xp_verf.oa_base = cd->verf_body;
 285         svc_vc_ops(xprt);  /* truely deals with calls */
 286         xprt->xp_port = 0;  /* this is a connection, not a rendezvouser */
 287         xprt->xp_fd = fd;
 288         if (__rpc_fd2sockinfo(fd, &si) && __rpc_sockinfo2netid(&si, &netid))
 289                 if ((xprt->xp_netid = strdup(netid)) == NULL)
 290                         goto outofmem;
 291
 292         if (!xprt_register(xprt))
 293                 goto out;
 294         return xprt;
 295
 296 outofmem:
 297         warn("svc_tcp: makefd_xprt");
 298 out:
 299         if (xprt)
 300                 mem_free(xprt, sizeof(SVCXPRT));
 301         return NULL;
 302 }
 303
 304 /*ARGSUSED*/
 305 static bool_t
 306 rendezvous_request(SVCXPRT *xprt, struct rpc_msg *msg)
 307 {
 308         int sock, flags;
 309         struct cf_rendezvous *r;
 310         struct cf_conn *cd;
 311         struct sockaddr_storage addr;
 312         socklen_t len;
 313         struct __rpc_sockinfo si;
 314         SVCXPRT *newxprt;
 315         fd_set cleanfds;
 316
 317         _DIAGASSERT(xprt != NULL);
 318         _DIAGASSERT(msg != NULL);
 319
 320         r = (struct cf_rendezvous *)xprt->xp_p1;
 321 again:
 322         len = sizeof addr;
 323         if ((sock = accept(xprt->xp_fd, (struct sockaddr *)(void *)&addr,
 324             &len)) < 0) {
 325                 if (errno == EINTR)
 326                         goto again;
 327                 /*
 328                  * Clean out the most idle file descriptor when we're
 329                  * running out.
 330                  */
 331                 if (errno == EMFILE || errno == ENFILE) {
 332                         cleanfds = *get_fdset();
 333                         if (__svc_clean_idle(&cleanfds, 0, FALSE))
 334                                 goto again;
 335                 }
 336                 return FALSE;
 337         }
 338         /*
 339          * make a new transporter (re-uses xprt)
 340          */
 341         newxprt = makefd_xprt(sock, r->sendsize, r->recvsize);
 342         if (newxprt == NULL)
 343                 goto out;
 344         newxprt->xp_rtaddr.buf = mem_alloc(len);
 345         if (newxprt->xp_rtaddr.buf == NULL)
 346                 goto out;
 347         memcpy(newxprt->xp_rtaddr.buf, &addr, len);
 348         newxprt->xp_rtaddr.len = len;
 349 #ifdef PORTMAP
 350         if (addr.ss_family == AF_INET) {
 351                 newxprt->xp_raddr = *(struct sockaddr_in *)newxprt->xp_rtaddr.buf;
 352                 newxprt->xp_addrlen = sizeof (struct sockaddr_in);
 353         }
 354 #endif
 355         if (__rpc_fd2sockinfo(sock, &si))
 356                 __rpc_setnodelay(sock, &si);
 357
 358         cd = (struct cf_conn *)newxprt->xp_p1;
 359
 360         cd->recvsize = r->recvsize;
 361         cd->sendsize = r->sendsize;
 362         cd->maxrec = r->maxrec;
 363
 364         if (cd->maxrec != 0) {
 365                 flags = fcntl(sock, F_GETFL, 0);
 366                 if (flags  == -1)
 367                         goto out;
 368                 if (fcntl(sock, F_SETFL, flags | O_NONBLOCK) == -1)
 369                         goto out;
 370                 if (cd->recvsize > (u_int)cd->maxrec)
 371                         cd->recvsize = cd->maxrec;
 372                 cd->nonblock = TRUE;
 373                 __xdrrec_setnonblock(&cd->xdrs, cd->maxrec);
 374         } else
 375                 cd->nonblock = FALSE;
 376
 377         (void)gettimeofday(&cd->last_recv_time, NULL);
 378
 379         return FALSE; /* there is never an rpc msg to be processed */
 380 out:
 381         (void)close(sock);
 382         return FALSE; /* there was an error */
 383 }
 384
 385 /*ARGSUSED*/
 386 static enum xprt_stat
 387 rendezvous_stat(SVCXPRT *xprt)
 388 {
 389
 390         return XPRT_IDLE;
 391 }
 392
 393 static void
 394 svc_vc_destroy(SVCXPRT *xprt)
 395 {
 396         _DIAGASSERT(xprt != NULL);
 397
 398         xprt_unregister(xprt);
 399         __svc_vc_dodestroy(xprt);
 400 }
 401
 402 static void
 403 __svc_vc_dodestroy(SVCXPRT *xprt)
 404 {
 405         struct cf_conn *cd;
 406         struct cf_rendezvous *r;
 407
 408         cd = (struct cf_conn *)xprt->xp_p1;
 409
 410         if (xprt->xp_fd != RPC_ANYFD)
 411                 (void)close(xprt->xp_fd);
 412         if (xprt->xp_port != 0) {
 413                 /* a rendezvouser socket */
 414                 r = (struct cf_rendezvous *)xprt->xp_p1;
 415                 mem_free(r, sizeof (struct cf_rendezvous));
 416                 xprt->xp_port = 0;
 417         } else {
 418                 /* an actual connection socket */
 419                 XDR_DESTROY(&(cd->xdrs));
 420                 mem_free(cd, sizeof(struct cf_conn));
 421         }
 422         if (xprt->xp_rtaddr.buf)
 423                 mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.maxlen);
 424         if (xprt->xp_ltaddr.buf)
 425                 mem_free(xprt->xp_ltaddr.buf, xprt->xp_ltaddr.maxlen);
 426         if (xprt->xp_tp)
 427                 free(xprt->xp_tp);
 428         if (xprt->xp_netid)
 429                 free(xprt->xp_netid);
 430         mem_free(xprt, sizeof(SVCXPRT));
 431 }
 432
 433 /*ARGSUSED*/
 434 static bool_t
 435 svc_vc_control(SVCXPRT *xprt, const u_int rq, void *in)
 436 {
 437         return FALSE;
 438 }
 439
 440 /*ARGSUSED*/
 441 static bool_t
 442 svc_vc_rendezvous_control(SVCXPRT *xprt, const u_int rq, void *in)
 443 {
 444         struct cf_rendezvous *cfp;
 445
 446         cfp = (struct cf_rendezvous *)xprt->xp_p1;
 447         if (cfp == NULL)
 448                 return FALSE;
 449         switch (rq) {
 450                 case SVCGET_CONNMAXREC:
 451                         *(int *)in = cfp->maxrec;
 452                         break;
 453                 case SVCSET_CONNMAXREC:
 454                         cfp->maxrec = *(int *)in;
 455                         break;
 456                 default:
 457                         return FALSE;
 458         }
 459         return TRUE;
 460 }
 461
 462 /*
 463  * reads data from the tcp connection.
 464  * any error is fatal and the connection is closed.
 465  * (And a read of zero bytes is a half closed stream => error.)
 466  * All read operations timeout after 35 seconds.  A timeout is
 467  * fatal for the connection.
 468  */
 469 static int
 470 read_vc(caddr_t xprtp, caddr_t buf, int len)
 471 {
 472         SVCXPRT *xprt;
 473         int sock;
 474         struct pollfd pollfd;
 475         struct sockaddr *sa;
 476         struct msghdr msg;
 477         struct cmsghdr *cmp;
 478         void *crmsg = NULL;
 479         struct sockcred *sc;
 480         socklen_t crmsgsize;
 481         struct cf_conn *cfp;
 482         static const struct timespec ts = { 35, 0 };
 483
 484         xprt = (SVCXPRT *)(void *)xprtp;
 485         _DIAGASSERT(xprt != NULL);
 486
 487         sock = xprt->xp_fd;
 488
 489         sa = (struct sockaddr *)xprt->xp_rtaddr.buf;
 490         if (sa->sa_family == AF_LOCAL && xprt->xp_p2 == NULL) {
 491                 memset(&msg, 0, sizeof msg);
 492                 crmsgsize = CMSG_SPACE(SOCKCREDSIZE(NGROUPS));
 493                 crmsg = malloc(crmsgsize);
 494                 if (crmsg == NULL)
 495                         goto fatal_err;
 496                 memset(crmsg, 0, crmsgsize);
 497
 498                 msg.msg_control = crmsg;
 499                 msg.msg_controllen = crmsgsize;
 500
 501                 if (recvmsg(sock, &msg, 0) < 0)
 502                         goto fatal_err;
 503
 504                 if (msg.msg_controllen == 0 ||
 505                     (msg.msg_flags & MSG_CTRUNC) != 0)
 506                         goto fatal_err;
 507
 508                 cmp = CMSG_FIRSTHDR(&msg);
 509                 if (cmp->cmsg_level != SOL_SOCKET ||
 510                     cmp->cmsg_type != SCM_CREDS)
 511                         goto fatal_err;
 512
 513                 sc = (struct sockcred *)(void *)CMSG_DATA(cmp);
 514
 515                 xprt->xp_p2 = mem_alloc(SOCKCREDSIZE(sc->sc_ngroups));
 516                 if (xprt->xp_p2 == NULL)
 517                         goto fatal_err;
 518
 519                 memcpy(xprt->xp_p2, sc, SOCKCREDSIZE(sc->sc_ngroups));
 520                 free(crmsg);
 521                 crmsg = NULL;
 522         }
 523
 524         cfp = (struct cf_conn *)xprt->xp_p1;
 525
 526         if (cfp->nonblock) {
 527                 len = (int)read(sock, buf, (size_t)len);
 528                 if (len < 0) {
 529                         if (errno == EAGAIN)
 530                                 len = 0;
 531                         else
 532                                 goto fatal_err;
 533                 }
 534                 if (len != 0)
 535                         gettimeofday(&cfp->last_recv_time, NULL);
 536                 return len;
 537         }
 538
 539         do {
 540                 pollfd.fd = sock;
 541                 pollfd.events = POLLIN;
 542                 switch (pollts(&pollfd, 1, &ts, NULL)) {
 543                 case -1:
 544                         if (errno == EINTR) {
 545                                 continue;
 546                         }
 547                         /*FALLTHROUGH*/
 548                 case 0:
 549                         goto fatal_err;
 550
 551                 default:
 552                         break;
 553                 }
 554         } while ((pollfd.revents & POLLIN) == 0);
 555
 556         if ((len = (int)read(sock, buf, (size_t)len)) > 0) {
 557                 gettimeofday(&cfp->last_recv_time, NULL);
 558                 return len;
 559         }
 560
 561 fatal_err:
 562         if (crmsg != NULL)
 563                 free(crmsg);
 564         ((struct cf_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;
 565         return -1;
 566 }
 567
 568 /*
 569  * writes data to the tcp connection.
 570  * Any error is fatal and the connection is closed.
 571  */
 572 static int
 573 write_vc(caddr_t xprtp, caddr_t buf, int len)
 574 {
 575         SVCXPRT *xprt;
 576         int i, cnt;
 577         struct cf_conn *cd;
 578         struct timeval tv0, tv1;
 579
 580         xprt = (SVCXPRT *)(void *)xprtp;
 581         _DIAGASSERT(xprt != NULL);
 582
 583         cd = (struct cf_conn *)xprt->xp_p1;
 584
 585         if (cd->nonblock)
 586                 gettimeofday(&tv0, NULL);
 587
 588         for (cnt = len; cnt > 0; cnt -= i, buf += i) {
 589                 if ((i = (int)write(xprt->xp_fd, buf, (size_t)cnt)) < 0) {
 590                         if (errno != EAGAIN || !cd->nonblock) {
 591                                 cd->strm_stat = XPRT_DIED;
 592                                 return -1;
 593                         }
 594                         if (cd->nonblock) {
 595                                 /*
 596                                  * For non-blocking connections, do not
 597                                  * take more than 2 seconds writing the
 598                                  * data out.
 599                                  *
 600                                  * XXX 2 is an arbitrary amount.
 601                                  */
 602                                 gettimeofday(&tv1, NULL);
 603                                 if (tv1.tv_sec - tv0.tv_sec >= 2) {
 604                                         cd->strm_stat = XPRT_DIED;
 605                                         return -1;
 606                                 }
 607                         }
 608                         i = 0;
 609                 }
 610         }
 611         return len;
 612 }
 613
 614 static enum xprt_stat
 615 svc_vc_stat(SVCXPRT *xprt)
 616 {
 617         struct cf_conn *cd;
 618
 619         _DIAGASSERT(xprt != NULL);
 620
 621         cd = (struct cf_conn *)(xprt->xp_p1);
 622
 623         if (cd->strm_stat == XPRT_DIED)
 624                 return XPRT_DIED;
 625         if (! xdrrec_eof(&(cd->xdrs)))
 626                 return XPRT_MOREREQS;
 627         return XPRT_IDLE;
 628 }
 629
 630 static bool_t
 631 svc_vc_recv(SVCXPRT *xprt, struct rpc_msg *msg)
 632 {
 633         struct cf_conn *cd;
 634         XDR *xdrs;
 635
 636         _DIAGASSERT(xprt != NULL);
 637         _DIAGASSERT(msg != NULL);
 638
 639         cd = (struct cf_conn *)(xprt->xp_p1);
 640         xdrs = &(cd->xdrs);
 641
 642         if (cd->nonblock) {
 643                 if (!__xdrrec_getrec(xdrs, &cd->strm_stat, TRUE))
 644                         return FALSE;
 645         }
 646
 647         xdrs->x_op = XDR_DECODE;
 648         (void)xdrrec_skiprecord(xdrs);
 649
 650         if (xdr_callmsg(xdrs, msg)) {
 651                 cd->x_id = msg->rm_xid;
 652                 return TRUE;
 653         }
 654         cd->strm_stat = XPRT_DIED;
 655         return FALSE;
 656 }
 657
 658 static bool_t
 659 svc_vc_getargs(SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr)
 660 {
 661
 662         _DIAGASSERT(xprt != NULL);
 663         /* args_ptr may be NULL */
 664
 665         return (*xdr_args)(&(((struct cf_conn *)(xprt->xp_p1))->xdrs),
 666             args_ptr);
 667 }
 668
 669 static bool_t
 670 svc_vc_freeargs(SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr)
 671 {
 672         XDR *xdrs;
 673
 674         _DIAGASSERT(xprt != NULL);
 675         /* args_ptr may be NULL */
 676
 677         xdrs = &(((struct cf_conn *)(xprt->xp_p1))->xdrs);
 678
 679         xdrs->x_op = XDR_FREE;
 680         return (*xdr_args)(xdrs, args_ptr);
 681 }
 682
 683 static bool_t
 684 svc_vc_reply(SVCXPRT *xprt, struct rpc_msg *msg)
 685 {
 686         struct cf_conn *cd;
 687         XDR *xdrs;
 688         bool_t rstat;
 689
 690         _DIAGASSERT(xprt != NULL);
 691         _DIAGASSERT(msg != NULL);
 692
 693         cd = (struct cf_conn *)(xprt->xp_p1);
 694         xdrs = &(cd->xdrs);
 695
 696         xdrs->x_op = XDR_ENCODE;
 697         msg->rm_xid = cd->x_id;
 698         rstat = xdr_replymsg(xdrs, msg);
 699         (void)xdrrec_endofrecord(xdrs, TRUE);
 700         return rstat;
 701 }
 702
 703 static void
 704 svc_vc_ops(SVCXPRT *xprt)
 705 {
 706         static struct xp_ops ops;
 707         static struct xp_ops2 ops2;
 708 #ifdef _REENTRANT
 709         extern mutex_t ops_lock;
 710 #endif
 711
 712 /* VARIABLES PROTECTED BY ops_lock: ops, ops2 */
 713
 714         mutex_lock(&ops_lock);
 715         if (ops.xp_recv == NULL) {
 716                 ops.xp_recv = svc_vc_recv;
 717                 ops.xp_stat = svc_vc_stat;
 718                 ops.xp_getargs = svc_vc_getargs;
 719                 ops.xp_reply = svc_vc_reply;
 720                 ops.xp_freeargs = svc_vc_freeargs;
 721                 ops.xp_destroy = svc_vc_destroy;
 722                 ops2.xp_control = svc_vc_control;
 723         }
 724         xprt->xp_ops = &ops;
 725         xprt->xp_ops2 = &ops2;
 726         mutex_unlock(&ops_lock);
 727 }
 728
 729 static void
 730 svc_vc_rendezvous_ops(SVCXPRT *xprt)
 731 {
 732         static struct xp_ops ops;
 733         static struct xp_ops2 ops2;
 734 #ifdef _REENTRANT
 735         extern mutex_t ops_lock;
 736 #endif
 737         mutex_lock(&ops_lock);
 738         if (ops.xp_recv == NULL) {
 739                 ops.xp_recv = rendezvous_request;
 740                 ops.xp_stat = rendezvous_stat;
 741                 ops.xp_getargs =
 742                     (bool_t (*)(SVCXPRT *, xdrproc_t, caddr_t))abort;
 743                 ops.xp_reply =
 744                     (bool_t (*)(SVCXPRT *, struct rpc_msg *))abort;
 745                 ops.xp_freeargs =
 746                     (bool_t (*)(SVCXPRT *, xdrproc_t, caddr_t))abort;
 747                 ops.xp_destroy = svc_vc_destroy;
 748                 ops2.xp_control = svc_vc_rendezvous_control;
 749         }
 750         xprt->xp_ops = &ops;
 751         xprt->xp_ops2 = &ops2;
 752         mutex_unlock(&ops_lock);
 753 }
 754
 755 /*
 756  * Destroy xprts that have not have had any activity in 'timeout' seconds.
 757  * If 'cleanblock' is true, blocking connections (the default) are also
 758  * cleaned. If timeout is 0, the least active connection is picked.
 759  */
 760 bool_t
 761 __svc_clean_idle(fd_set *fds, int timeout, bool_t cleanblock)
 762 {
 763         int i, ncleaned;
 764         SVCXPRT *xprt, *least_active;
 765         struct timeval tv, tdiff, tmax;
 766         struct cf_conn *cd;
 767
 768         gettimeofday(&tv, NULL);
 769         tmax.tv_sec = tmax.tv_usec = 0;
 770         least_active = NULL;
 771         rwlock_wrlock(&svc_fd_lock);
 772         for (i = ncleaned = 0; i <= svc_maxfd; i++) {
 773                 if (FD_ISSET(i, fds)) {
 774                         xprt = __svc_xports[i];
 775                         if (xprt == NULL || xprt->xp_ops == NULL ||
 776                             xprt->xp_ops->xp_recv != svc_vc_recv)
 777                                 continue;
 778                         cd = (struct cf_conn *)xprt->xp_p1;
 779                         if (!cleanblock && !cd->nonblock)
 780                                 continue;
 781                         if (timeout == 0) {
 782                                 timersub(&tv, &cd->last_recv_time, &tdiff);
 783                                 if (timercmp(&tdiff, &tmax, >)) {
 784                                         tmax = tdiff;
 785                                         least_active = xprt;
 786                                 }
 787                                 continue;
 788                         }
 789                         if (tv.tv_sec - cd->last_recv_time.tv_sec > timeout) {
 790                                 __xprt_unregister_unlocked(xprt);
 791                                 __svc_vc_dodestroy(xprt);
 792                                 ncleaned++;
 793                         }
 794                 }
 795         }
 796         if (timeout == 0 && least_active != NULL) {
 797                 __xprt_unregister_unlocked(least_active);
 798                 __svc_vc_dodestroy(least_active);
 799                 ncleaned++;
 800         }
 801         rwlock_unlock(&svc_fd_lock);
 802         return ncleaned > 0 ? TRUE : FALSE;
 803 }