source: rtems-libbsd/freebsd/lib/libc/rpc/svc_vc.c

#include <machine/rtems-bsd-user-space.h>

/*      $NetBSD: svc_vc.c,v 1.7 2000/08/03 00:01:53 fvdl Exp $  */

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 2009, Sun Microsystems, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 * - Redistributions of source code must retain the above copyright notice, 
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice, 
 *   this list of conditions and the following disclaimer in the documentation 
 *   and/or other materials provided with the distribution.
 * - Neither the name of Sun Microsystems, Inc. nor the names of its 
 *   contributors may be used to endorse or promote products derived 
 *   from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 * POSSIBILITY OF SUCH DAMAGE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char *sccsid2 = "@(#)svc_tcp.c 1.21 87/08/11 Copyr 1984 Sun Micro";
static char *sccsid = "@(#)svc_tcp.c    2.2 88/08/01 4.0 RPCSRC";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

/*
 * svc_vc.c, Server side for Connection Oriented based RPC. 
 *
 * Actually implements two flavors of transporter -
 * a tcp rendezvouser (a listner and connection establisher)
 * and a record/tcp stream.
 */

#include "namespace.h"
#include "reentrant.h"
#include <sys/param.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <netinet/in.h>
#include <netinet/tcp.h>

#include <assert.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <rpc/rpc.h>

#include "rpc_com.h"
#include "mt_misc.h"
#include "un-namespace.h"

static SVCXPRT *makefd_xprt(int, u_int, u_int);
static bool_t rendezvous_request(SVCXPRT *, struct rpc_msg *);
static enum xprt_stat rendezvous_stat(SVCXPRT *);
static void svc_vc_destroy(SVCXPRT *);
static void __svc_vc_dodestroy (SVCXPRT *);
static int read_vc(void *, void *, int);
static int write_vc(void *, void *, int);
static enum xprt_stat svc_vc_stat(SVCXPRT *);
static bool_t svc_vc_recv(SVCXPRT *, struct rpc_msg *);
static bool_t svc_vc_getargs(SVCXPRT *, xdrproc_t, void *);
static bool_t svc_vc_freeargs(SVCXPRT *, xdrproc_t, void *);
static bool_t svc_vc_reply(SVCXPRT *, struct rpc_msg *);
static void svc_vc_rendezvous_ops(SVCXPRT *);
static void svc_vc_ops(SVCXPRT *);
static bool_t svc_vc_control(SVCXPRT *xprt, const u_int rq, void *in);
static bool_t svc_vc_rendezvous_control (SVCXPRT *xprt, const u_int rq,
                                             void *in);

struct cf_rendezvous { /* kept in xprt->xp_p1 for rendezvouser */
        u_int sendsize;
        u_int recvsize;
        int maxrec;
};

struct cf_conn {  /* kept in xprt->xp_p1 for actual connection */
        enum xprt_stat strm_stat;
        u_int32_t x_id;
        XDR xdrs;
        char verf_body[MAX_AUTH_BYTES];
        u_int sendsize;
        u_int recvsize;
        int maxrec;
        bool_t nonblock;
        struct timeval last_recv_time;
};

/*
 * Usage:
 *      xprt = svc_vc_create(sock, send_buf_size, recv_buf_size);
 *
 * Creates, registers, and returns a (rpc) tcp based transporter.
 * Once *xprt is initialized, it is registered as a transporter
 * see (svc.h, xprt_register).  This routine returns
 * a NULL if a problem occurred.
 *
 * The filedescriptor passed in is expected to refer to a bound, but
 * not yet connected socket.
 *
 * Since streams do buffered io similar to stdio, the caller can specify
 * how big the send and receive buffers are via the second and third parms;
 * 0 => use the system default.
 */
SVCXPRT *
svc_vc_create(int fd, u_int sendsize, u_int recvsize)
{
        SVCXPRT *xprt = NULL;
        struct cf_rendezvous *r = NULL;
        struct __rpc_sockinfo si;
        struct sockaddr_storage sslocal;
        socklen_t slen;

        if (!__rpc_fd2sockinfo(fd, &si))
                return NULL;

        r = mem_alloc(sizeof(*r));
        if (r == NULL) {
                warnx("svc_vc_create: out of memory");
                goto cleanup_svc_vc_create;
        }
        r->sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize);
        r->recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize);
        r->maxrec = __svc_maxrec;
        xprt = svc_xprt_alloc();
        if (xprt == NULL) {
                warnx("svc_vc_create: out of memory");
                goto cleanup_svc_vc_create;
        }
        xprt->xp_p1 = r;
        xprt->xp_verf = _null_auth;
        svc_vc_rendezvous_ops(xprt);
        xprt->xp_port = (u_short)-1;    /* It is the rendezvouser */
        xprt->xp_fd = fd;

        slen = sizeof (struct sockaddr_storage);
        if (_getsockname(fd, (struct sockaddr *)(void *)&sslocal, &slen) < 0) {
                warnx("svc_vc_create: could not retrieve local addr");
                goto cleanup_svc_vc_create;
        }

        xprt->xp_ltaddr.maxlen = xprt->xp_ltaddr.len = sslocal.ss_len;
        xprt->xp_ltaddr.buf = mem_alloc((size_t)sslocal.ss_len);
        if (xprt->xp_ltaddr.buf == NULL) {
                warnx("svc_vc_create: no mem for local addr");
                goto cleanup_svc_vc_create;
        }
        memcpy(xprt->xp_ltaddr.buf, &sslocal, (size_t)sslocal.ss_len);

        xprt->xp_rtaddr.maxlen = sizeof (struct sockaddr_storage);
        xprt_register(xprt);
        return (xprt);
cleanup_svc_vc_create:
        if (xprt)
                mem_free(xprt, sizeof(*xprt));
        if (r != NULL)
                mem_free(r, sizeof(*r));
        return (NULL);
}

/*
 * Like svtcp_create(), except the routine takes any *open* UNIX file
 * descriptor as its first input.
 */
SVCXPRT *
svc_fd_create(int fd, u_int sendsize, u_int recvsize)
{
        struct sockaddr_storage ss;
        socklen_t slen;
        SVCXPRT *ret;

        assert(fd != -1);

        ret = makefd_xprt(fd, sendsize, recvsize);
        if (ret == NULL)
                return NULL;

        slen = sizeof (struct sockaddr_storage);
        if (_getsockname(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) {
                warnx("svc_fd_create: could not retrieve local addr");
                goto freedata;
        }
        ret->xp_ltaddr.maxlen = ret->xp_ltaddr.len = ss.ss_len;
        ret->xp_ltaddr.buf = mem_alloc((size_t)ss.ss_len);
        if (ret->xp_ltaddr.buf == NULL) {
                warnx("svc_fd_create: no mem for local addr");
                goto freedata;
        }
        memcpy(ret->xp_ltaddr.buf, &ss, (size_t)ss.ss_len);

        slen = sizeof (struct sockaddr_storage);
        if (_getpeername(fd, (struct sockaddr *)(void *)&ss, &slen) < 0) {
                warnx("svc_fd_create: could not retrieve remote addr");
                goto freedata;
        }
        ret->xp_rtaddr.maxlen = ret->xp_rtaddr.len = ss.ss_len;
        ret->xp_rtaddr.buf = mem_alloc((size_t)ss.ss_len);
        if (ret->xp_rtaddr.buf == NULL) {
                warnx("svc_fd_create: no mem for local addr");
                goto freedata;
        }
        memcpy(ret->xp_rtaddr.buf, &ss, (size_t)ss.ss_len);
#ifdef PORTMAP
        if (ss.ss_family == AF_INET || ss.ss_family == AF_LOCAL) {
                ret->xp_raddr = *(struct sockaddr_in *)ret->xp_rtaddr.buf;
                ret->xp_addrlen = sizeof (struct sockaddr_in);
        }
#endif                          /* PORTMAP */

        return ret;

freedata:
        if (ret->xp_ltaddr.buf != NULL)
                mem_free(ret->xp_ltaddr.buf, rep->xp_ltaddr.maxlen);

        return NULL;
}

static SVCXPRT *
makefd_xprt(int fd, u_int sendsize, u_int recvsize)
{
        SVCXPRT *xprt;
        struct cf_conn *cd;
        const char *netid;
        struct __rpc_sockinfo si;
 
        assert(fd != -1);

        xprt = svc_xprt_alloc();
        if (xprt == NULL) {
                warnx("svc_vc: makefd_xprt: out of memory");
                goto done;
        }
        cd = mem_alloc(sizeof(struct cf_conn));
        if (cd == NULL) {
                warnx("svc_tcp: makefd_xprt: out of memory");
                svc_xprt_free(xprt);
                xprt = NULL;
                goto done;
        }
        cd->strm_stat = XPRT_IDLE;
        xdrrec_create(&(cd->xdrs), sendsize, recvsize,
            xprt, read_vc, write_vc);
        xprt->xp_p1 = cd;
        xprt->xp_verf.oa_base = cd->verf_body;
        svc_vc_ops(xprt);  /* truly deals with calls */
        xprt->xp_port = 0;  /* this is a connection, not a rendezvouser */
        xprt->xp_fd = fd;
        if (__rpc_fd2sockinfo(fd, &si) && __rpc_sockinfo2netid(&si, &netid))
                xprt->xp_netid = strdup(netid);

        xprt_register(xprt);
done:
        return (xprt);
}

/*ARGSUSED*/
static bool_t
rendezvous_request(SVCXPRT *xprt, struct rpc_msg *msg)
{
        int sock, flags;
        struct cf_rendezvous *r;
        struct cf_conn *cd;
        struct sockaddr_storage addr, sslocal;
        socklen_t len, slen;
        struct __rpc_sockinfo si;
        SVCXPRT *newxprt;
        fd_set cleanfds;

        assert(xprt != NULL);
        assert(msg != NULL);

        r = (struct cf_rendezvous *)xprt->xp_p1;
again:
        len = sizeof addr;
        if ((sock = _accept(xprt->xp_fd, (struct sockaddr *)(void *)&addr,
            &len)) < 0) {
                if (errno == EINTR)
                        goto again;
                /*
                 * Clean out the most idle file descriptor when we're
                 * running out.
                 */
                if (errno == EMFILE || errno == ENFILE) {
                        cleanfds = svc_fdset;
                        __svc_clean_idle(&cleanfds, 0, FALSE);
                        goto again;
                }
                return (FALSE);
        }
        /*
         * make a new transporter (re-uses xprt)
         */
        newxprt = makefd_xprt(sock, r->sendsize, r->recvsize);
        newxprt->xp_rtaddr.buf = mem_alloc(len);
        if (newxprt->xp_rtaddr.buf == NULL)
                return (FALSE);
        memcpy(newxprt->xp_rtaddr.buf, &addr, len);
        newxprt->xp_rtaddr.len = len;
#ifdef PORTMAP
        if (addr.ss_family == AF_INET || addr.ss_family == AF_LOCAL) {
                newxprt->xp_raddr = *(struct sockaddr_in *)newxprt->xp_rtaddr.buf;
                newxprt->xp_addrlen = sizeof (struct sockaddr_in);
        }
#endif                          /* PORTMAP */
        if (__rpc_fd2sockinfo(sock, &si) && si.si_proto == IPPROTO_TCP) {
                len = 1;
                /* XXX fvdl - is this useful? */
                _setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &len, sizeof (len));
        }

        cd = (struct cf_conn *)newxprt->xp_p1;

        cd->recvsize = r->recvsize;
        cd->sendsize = r->sendsize;
        cd->maxrec = r->maxrec;

        if (cd->maxrec != 0) {
                flags = _fcntl(sock, F_GETFL, 0);
                if (flags  == -1)
                        return (FALSE);
                if (_fcntl(sock, F_SETFL, flags | O_NONBLOCK) == -1)
                        return (FALSE);
                if (cd->recvsize > cd->maxrec)
                        cd->recvsize = cd->maxrec;
                cd->nonblock = TRUE;
                __xdrrec_setnonblock(&cd->xdrs, cd->maxrec);
        } else
                cd->nonblock = FALSE;
        slen = sizeof(struct sockaddr_storage);
        if(_getsockname(sock, (struct sockaddr *)(void *)&sslocal, &slen) < 0) {
                warnx("svc_vc_create: could not retrieve local addr");
                newxprt->xp_ltaddr.maxlen = newxprt->xp_ltaddr.len = 0;
        } else {
                newxprt->xp_ltaddr.maxlen = newxprt->xp_ltaddr.len = sslocal.ss_len;
                newxprt->xp_ltaddr.buf = mem_alloc((size_t)sslocal.ss_len);
                if (newxprt->xp_ltaddr.buf == NULL) {
                        warnx("svc_vc_create: no mem for local addr");
                        newxprt->xp_ltaddr.maxlen = newxprt->xp_ltaddr.len = 0;
                } else {
                        memcpy(newxprt->xp_ltaddr.buf, &sslocal, (size_t)sslocal.ss_len);
                }
        }

        gettimeofday(&cd->last_recv_time, NULL);

        return (FALSE); /* there is never an rpc msg to be processed */
}

/*ARGSUSED*/
static enum xprt_stat
rendezvous_stat(SVCXPRT *xprt)
{

        return (XPRT_IDLE);
}

static void
svc_vc_destroy(SVCXPRT *xprt)
{
        assert(xprt != NULL);
        
        xprt_unregister(xprt);
        __svc_vc_dodestroy(xprt);
}

static void
__svc_vc_dodestroy(SVCXPRT *xprt)
{
        struct cf_conn *cd;
        struct cf_rendezvous *r;

        cd = (struct cf_conn *)xprt->xp_p1;

        if (xprt->xp_fd != RPC_ANYFD)
                (void)_close(xprt->xp_fd);
        if (xprt->xp_port != 0) {
                /* a rendezvouser socket */
                r = (struct cf_rendezvous *)xprt->xp_p1;
                mem_free(r, sizeof (struct cf_rendezvous));
                xprt->xp_port = 0;
        } else {
                /* an actual connection socket */
                XDR_DESTROY(&(cd->xdrs));
                mem_free(cd, sizeof(struct cf_conn));
        }
        if (xprt->xp_rtaddr.buf)
                mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.maxlen);
        if (xprt->xp_ltaddr.buf)
                mem_free(xprt->xp_ltaddr.buf, xprt->xp_ltaddr.maxlen);
        free(xprt->xp_tp);
        free(xprt->xp_netid);
        svc_xprt_free(xprt);
}

/*ARGSUSED*/
static bool_t
svc_vc_control(SVCXPRT *xprt, const u_int rq, void *in)
{
        return (FALSE);
}

static bool_t
svc_vc_rendezvous_control(SVCXPRT *xprt, const u_int rq, void *in)
{
        struct cf_rendezvous *cfp;

        cfp = (struct cf_rendezvous *)xprt->xp_p1;
        if (cfp == NULL)
                return (FALSE);
        switch (rq) {
                case SVCGET_CONNMAXREC:
                        *(int *)in = cfp->maxrec;
                        break;
                case SVCSET_CONNMAXREC:
                        cfp->maxrec = *(int *)in;
                        break;
                default:
                        return (FALSE);
        }
        return (TRUE);
}

/*
 * reads data from the tcp or uip connection.
 * any error is fatal and the connection is closed.
 * (And a read of zero bytes is a half closed stream => error.)
 * All read operations timeout after 35 seconds.  A timeout is
 * fatal for the connection.
 */
static int
read_vc(void *xprtp, void *buf, int len)
{
        SVCXPRT *xprt;
        int sock;
        int milliseconds = 35 * 1000;
        struct pollfd pollfd;
        struct cf_conn *cfp;

        xprt = (SVCXPRT *)xprtp;
        assert(xprt != NULL);

        sock = xprt->xp_fd;

        cfp = (struct cf_conn *)xprt->xp_p1;

        if (cfp->nonblock) {
                len = _read(sock, buf, (size_t)len);
                if (len < 0) {
                        if (errno == EAGAIN)
                                len = 0;
                        else
                                goto fatal_err;
                }
                if (len != 0)
                        gettimeofday(&cfp->last_recv_time, NULL);
                return len;
        }

        do {
                pollfd.fd = sock;
                pollfd.events = POLLIN;
                pollfd.revents = 0;
                switch (_poll(&pollfd, 1, milliseconds)) {
                case -1:
                        if (errno == EINTR)
                                continue;
                        /*FALLTHROUGH*/
                case 0:
                        goto fatal_err;

                default:
                        break;
                }
        } while ((pollfd.revents & POLLIN) == 0);

        if ((len = _read(sock, buf, (size_t)len)) > 0) {
                gettimeofday(&cfp->last_recv_time, NULL);
                return (len);
        }

fatal_err:
        ((struct cf_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;
        return (-1);
}

/*
 * writes data to the tcp connection.
 * Any error is fatal and the connection is closed.
 */
static int
write_vc(void *xprtp, void *buf, int len)
{
        SVCXPRT *xprt;
        int i, cnt;
        struct cf_conn *cd;
        struct timeval tv0, tv1;

        xprt = (SVCXPRT *)xprtp;
        assert(xprt != NULL);

        cd = (struct cf_conn *)xprt->xp_p1;

        if (cd->nonblock)
                gettimeofday(&tv0, NULL);
        
        for (cnt = len; cnt > 0; cnt -= i, buf = (char *)buf + i) {
                i = _write(xprt->xp_fd, buf, (size_t)cnt);
                if (i  < 0) {
                        if (errno != EAGAIN || !cd->nonblock) {
                                cd->strm_stat = XPRT_DIED;
                                return (-1);
                        }
                        if (cd->nonblock) {
                                /*
                                 * For non-blocking connections, do not
                                 * take more than 2 seconds writing the
                                 * data out.
                                 *
                                 * XXX 2 is an arbitrary amount.
                                 */
                                gettimeofday(&tv1, NULL);
                                if (tv1.tv_sec - tv0.tv_sec >= 2) {
                                        cd->strm_stat = XPRT_DIED;
                                        return (-1);
                                }
                        }
                        i = 0;
                }
        }

        return (len);
}

static enum xprt_stat
svc_vc_stat(SVCXPRT *xprt)
{
        struct cf_conn *cd;

        assert(xprt != NULL);

        cd = (struct cf_conn *)(xprt->xp_p1);

        if (cd->strm_stat == XPRT_DIED)
                return (XPRT_DIED);
        if (! xdrrec_eof(&(cd->xdrs)))
                return (XPRT_MOREREQS);
        return (XPRT_IDLE);
}

static bool_t
svc_vc_recv(SVCXPRT *xprt, struct rpc_msg *msg)
{
        struct cf_conn *cd;
        XDR *xdrs;

        assert(xprt != NULL);
        assert(msg != NULL);

        cd = (struct cf_conn *)(xprt->xp_p1);
        xdrs = &(cd->xdrs);

        if (cd->nonblock) {
                if (!__xdrrec_getrec(xdrs, &cd->strm_stat, TRUE))
                        return FALSE;
        } else {
                (void)xdrrec_skiprecord(xdrs);
        }

        xdrs->x_op = XDR_DECODE;
        if (xdr_callmsg(xdrs, msg)) {
                cd->x_id = msg->rm_xid;
                return (TRUE);
        }
        cd->strm_stat = XPRT_DIED;
        return (FALSE);
}

static bool_t
svc_vc_getargs(SVCXPRT *xprt, xdrproc_t xdr_args, void *args_ptr)
{
        struct cf_conn *cd;

        assert(xprt != NULL);
        cd = (struct cf_conn *)(xprt->xp_p1);
        return (SVCAUTH_UNWRAP(&SVC_AUTH(xprt),
                &cd->xdrs, xdr_args, args_ptr));
}

static bool_t
svc_vc_freeargs(SVCXPRT *xprt, xdrproc_t xdr_args, void *args_ptr)
{
        XDR *xdrs;

        assert(xprt != NULL);
        /* args_ptr may be NULL */

        xdrs = &(((struct cf_conn *)(xprt->xp_p1))->xdrs);

        xdrs->x_op = XDR_FREE;
        return ((*xdr_args)(xdrs, args_ptr));
}

static bool_t
svc_vc_reply(SVCXPRT *xprt, struct rpc_msg *msg)
{
        struct cf_conn *cd;
        XDR *xdrs;
        bool_t rstat;
        xdrproc_t xdr_proc;
        caddr_t xdr_where;
        u_int pos;

        assert(xprt != NULL);
        assert(msg != NULL);

        cd = (struct cf_conn *)(xprt->xp_p1);
        xdrs = &(cd->xdrs);

        xdrs->x_op = XDR_ENCODE;
        msg->rm_xid = cd->x_id;
        rstat = TRUE;
        if (msg->rm_reply.rp_stat == MSG_ACCEPTED &&
            msg->rm_reply.rp_acpt.ar_stat == SUCCESS) {
                xdr_proc = msg->acpted_rply.ar_results.proc;
                xdr_where = msg->acpted_rply.ar_results.where;
                msg->acpted_rply.ar_results.proc = (xdrproc_t) xdr_void;
                msg->acpted_rply.ar_results.where = NULL;

                pos = XDR_GETPOS(xdrs);
                if (!xdr_replymsg(xdrs, msg) ||
                    !SVCAUTH_WRAP(&SVC_AUTH(xprt), xdrs, xdr_proc, xdr_where)) {
                        XDR_SETPOS(xdrs, pos);
                        rstat = FALSE;
                }
        } else {
                rstat = xdr_replymsg(xdrs, msg);
        }

        if (rstat)
                (void)xdrrec_endofrecord(xdrs, TRUE);

        return (rstat);
}

static void
svc_vc_ops(SVCXPRT *xprt)
{
        static struct xp_ops ops;
        static struct xp_ops2 ops2;

/* VARIABLES PROTECTED BY ops_lock: ops, ops2 */

        mutex_lock(&ops_lock);
        if (ops.xp_recv == NULL) {
                ops.xp_recv = svc_vc_recv;
                ops.xp_stat = svc_vc_stat;
                ops.xp_getargs = svc_vc_getargs;
                ops.xp_reply = svc_vc_reply;
                ops.xp_freeargs = svc_vc_freeargs;
                ops.xp_destroy = svc_vc_destroy;
                ops2.xp_control = svc_vc_control;
        }
        xprt->xp_ops = &ops;
        xprt->xp_ops2 = &ops2;
        mutex_unlock(&ops_lock);
}

static void
svc_vc_rendezvous_ops(SVCXPRT *xprt)
{
        static struct xp_ops ops;
        static struct xp_ops2 ops2;

        mutex_lock(&ops_lock);
        if (ops.xp_recv == NULL) {
                ops.xp_recv = rendezvous_request;
                ops.xp_stat = rendezvous_stat;
                ops.xp_getargs =
                    (bool_t (*)(SVCXPRT *, xdrproc_t, void *))abort;
                ops.xp_reply =
                    (bool_t (*)(SVCXPRT *, struct rpc_msg *))abort;
                ops.xp_freeargs =
                    (bool_t (*)(SVCXPRT *, xdrproc_t, void *))abort;
                ops.xp_destroy = svc_vc_destroy;
                ops2.xp_control = svc_vc_rendezvous_control;
        }
        xprt->xp_ops = &ops;
        xprt->xp_ops2 = &ops2;
        mutex_unlock(&ops_lock);
}

/*
 * Get the effective UID of the sending process. Used by rpcbind, keyserv
 * and rpc.yppasswdd on AF_LOCAL.
 */
int
__rpc_get_local_uid(SVCXPRT *transp, uid_t *uid) {
        int sock, ret;
        gid_t egid;
        uid_t euid;
        struct sockaddr *sa;

        sock = transp->xp_fd;
        sa = (struct sockaddr *)transp->xp_rtaddr.buf;
        if (sa->sa_family == AF_LOCAL) {
                ret = getpeereid(sock, &euid, &egid);
                if (ret == 0)
                        *uid = euid;
                return (ret);
        } else
                return (-1);
}

/*
 * Destroy xprts that have not have had any activity in 'timeout' seconds.
 * If 'cleanblock' is true, blocking connections (the default) are also
 * cleaned. If timeout is 0, the least active connection is picked.
 */
bool_t
__svc_clean_idle(fd_set *fds, int timeout, bool_t cleanblock)
{
        int i, ncleaned;
        SVCXPRT *xprt, *least_active;
        struct timeval tv, tdiff, tmax;
        struct cf_conn *cd;

        gettimeofday(&tv, NULL);
        tmax.tv_sec = tmax.tv_usec = 0;
        least_active = NULL;
        rwlock_wrlock(&svc_fd_lock);
        for (i = ncleaned = 0; i <= svc_maxfd; i++) {
                if (FD_ISSET(i, fds)) {
                        xprt = __svc_xports[i];
                        if (xprt == NULL || xprt->xp_ops == NULL ||
                            xprt->xp_ops->xp_recv != svc_vc_recv)
                                continue;
                        cd = (struct cf_conn *)xprt->xp_p1;
                        if (!cleanblock && !cd->nonblock)
                                continue;
                        if (timeout == 0) {
                                timersub(&tv, &cd->last_recv_time, &tdiff);
                                if (timercmp(&tdiff, &tmax, >)) {
                                        tmax = tdiff;
                                        least_active = xprt;
                                }
                                continue;
                        }
                        if (tv.tv_sec - cd->last_recv_time.tv_sec > timeout) {
                                __xprt_unregister_unlocked(xprt);
                                __svc_vc_dodestroy(xprt);
                                ncleaned++;
                        }
                }
        }
        if (timeout == 0 && least_active != NULL) {
                __xprt_unregister_unlocked(least_active);
                __svc_vc_dodestroy(least_active);
                ncleaned++;
        }
        rwlock_unlock(&svc_fd_lock);
        return ncleaned > 0 ? TRUE : FALSE;
}