[NETAPI32]

[reactos.git] / reactos / dll / win32 / libtirpc / src / clnt_vc.c

/*
 * 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.
 */

/*
 * clnt_tcp.c, Implements a TCP/IP based, client side RPC.
 *
 * Copyright (C) 1984, Sun Microsystems, Inc.
 *
 * TCP based RPC supports 'batched calls'.
 * A sequence of calls may be batched-up in a send buffer.  The rpc call
 * return immediately to the client even though the call was not necessarily
 * sent.  The batching occurs if the results' xdr routine is NULL (0) AND
 * the rpc timeout value is zero (see clnt.h, rpc).
 *
 * Clients should NOT casually batch calls that in fact return results; that is,
 * the server side should be aware that a call is batched and not produce any
 * return message.  Batched calls that produce many result messages can
 * deadlock (netlock) the client and the server....
 *
 * Now go hang yourself.
 */

/* NFSv4.1 client for Windows
 * Copyright © 2012 The Regents of the University of Michigan
 *
 * Olga Kornievskaia <aglo@umich.edu>
 * Casey Bodley <cbodley@umich.edu>
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at
 * your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * without any warranty; without even the implied warranty of merchantability
 * or fitness for a particular purpose.  See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 */

#include <wintirpc.h>
//#include <pthread.h>

#include <reentrant.h>
#include <sys/types.h>
//#include <sys/poll.h>
//#include <sys/syslog.h>
//#include <sys/un.h>
//#include <sys/uio.h>
//#include <sys/socket.h>
//#include <arpa/inet.h>
#include <assert.h>
//#include <err.h>
#include <errno.h>
//#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
//#include <unistd.h>
//#include <signal.h>
#include <time.h>

#include <rpc/rpc.h>
#include "rpc_com.h"

#define MCALL_MSG_SIZE 24

#define CMGROUP_MAX    16
#define SCM_CREDS      0x03            /* process creds (struct cmsgcred) */

/*
 * Credentials structure, used to verify the identity of a peer
 * process that has sent us a message. This is allocated by the
 * peer process but filled in by the kernel. This prevents the
 * peer from lying about its identity. (Note that cmcred_groups[0]
 * is the effective GID.)
 */
struct cmsgcred {
        pid_t   cmcred_pid;             /* PID of sending process */
        uid_t   cmcred_uid;             /* real UID of sending process */
        uid_t   cmcred_euid;            /* effective UID of sending process */
        gid_t   cmcred_gid;             /* real GID of sending process */
        short   cmcred_ngroups;         /* number or groups */
        gid_t   cmcred_groups[CMGROUP_MAX];     /* groups */
};

struct cmessage {
        struct cmsghdr cmsg;
        struct cmsgcred cmcred;
};

static enum clnt_stat clnt_vc_call(CLIENT *, rpcproc_t, xdrproc_t, void *,
    xdrproc_t, void *, struct timeval);
static void clnt_vc_geterr(CLIENT *, struct rpc_err *);
static bool_t clnt_vc_freeres(CLIENT *, xdrproc_t, void *);
static void clnt_vc_abort(CLIENT *);
static bool_t clnt_vc_control(CLIENT *, u_int, void *);
static void clnt_vc_destroy(CLIENT *);
static struct clnt_ops *clnt_vc_ops(void);
static bool_t time_not_ok(struct timeval *);
static int read_vc(void *, void *, int);
static int write_vc(void *, void *, int);

struct ct_data {
        int             ct_fd;          /* connection's fd */
        bool_t          ct_closeit;     /* close it on destroy */
        struct timeval  ct_wait;        /* wait interval in milliseconds */
        bool_t          ct_waitset;     /* wait set by clnt_control? */
        struct netbuf   ct_addr;        /* remote addr */
        struct rpc_err  ct_error;
        union {
                char    ct_mcallc[MCALL_MSG_SIZE];      /* marshalled callmsg */
                u_int32_t ct_mcalli;
        } ct_u;
        u_int           ct_mpos;        /* pos after marshal */
        XDR             ct_xdrs;        /* XDR stream */
    struct rpc_msg reply_msg;
    bool_t use_stored_reply_msg;
};

/*
 *      This machinery implements per-fd locks for MT-safety.  It is not
 *      sufficient to do per-CLIENT handle locks for MT-safety because a
 *      user may create more than one CLIENT handle with the same fd behind
 *      it.  Therfore, we allocate an array of flags (vc_fd_locks), protected
 *      by the clnt_fd_lock mutex, and an array (vc_cv) of condition variables
 *      similarly protected.  Vc_fd_lock[fd] == 1 => a call is active on some
 *      CLIENT handle created for that fd.
 *      The current implementation holds locks across the entire RPC and reply.
 *      Yes, this is silly, and as soon as this code is proven to work, this
 *      should be the first thing fixed.  One step at a time.
 */
static int      *vc_fd_locks;
extern mutex_t  clnt_fd_lock;
static cond_t   *vc_cv;
#ifndef _WIN32
#define release_fd_lock(fd, mask) {     \
        mutex_lock(&clnt_fd_lock);      \
        vc_fd_locks[fd] = 0;            \
        mutex_unlock(&clnt_fd_lock);    \
        thr_sigsetmask(SIG_SETMASK, &(mask), (sigset_t *) NULL);        \
        cond_signal(&vc_cv[fd]);        \
}
#else
/* XXX Need Windows signal/event stuff XXX */
#define release_fd_lock(fd, mask) {     \
        mutex_lock(&clnt_fd_lock);      \
        vc_fd_locks[WINSOCK_HANDLE_HASH(fd)] = 0;               \
        mutex_unlock(&clnt_fd_lock);    \
        \
        cond_broadcast(&vc_cv[WINSOCK_HANDLE_HASH(fd)]);        \
}
#endif

#define acquire_fd_lock(fd) { \
        mutex_lock(&clnt_fd_lock); \
        while (vc_fd_locks[WINSOCK_HANDLE_HASH(fd)] && \
            vc_fd_locks[WINSOCK_HANDLE_HASH(fd)] != GetCurrentThreadId()) \
                cond_wait(&vc_cv[WINSOCK_HANDLE_HASH(fd)], &clnt_fd_lock); \
        vc_fd_locks[WINSOCK_HANDLE_HASH(fd)] = GetCurrentThreadId(); \
        mutex_unlock(&clnt_fd_lock); \
}

static const char clnt_vc_errstr[] = "%s : %s";
static const char clnt_vc_str[] = "clnt_vc_create";
static const char clnt_read_vc_str[] = "read_vc";
static const char __no_mem_str[] = "out of memory";

/* callback thread */
#define CALLBACK_TIMEOUT 5000
#define RQCRED_SIZE     400     /* this size is excessive */
static unsigned int WINAPI clnt_cb_thread(void *args) 
{
    int status = NO_ERROR;
    CLIENT *cl = (CLIENT *)args;
        struct ct_data *ct = (struct ct_data *) cl->cl_private;
        XDR *xdrs = &(ct->ct_xdrs);
    long saved_timeout_sec = ct->ct_wait.tv_sec;
    long saved_timeout_usec = ct->ct_wait.tv_usec;
    struct rpc_msg reply_msg;    
    char cred_area[2 * MAX_AUTH_BYTES + RQCRED_SIZE];

    fprintf(stderr/*stdout*/, "%04x: Creating callback thread\n", GetCurrentThreadId());
    while(1) {
        cb_req header;
        void *res = NULL;
        mutex_lock(&clnt_fd_lock);
            while (vc_fd_locks[WINSOCK_HANDLE_HASH(ct->ct_fd)] || 
                !ct->use_stored_reply_msg ||
                (ct->use_stored_reply_msg && ct->reply_msg.rm_direction != CALL)) {
            if (cl->shutdown)
                break;
                    if (!cond_wait_timed(&vc_cv[WINSOCK_HANDLE_HASH(ct->ct_fd)], &clnt_fd_lock, 
                CALLBACK_TIMEOUT))
                if (!vc_fd_locks[WINSOCK_HANDLE_HASH(ct->ct_fd)])
                    break;
        }
            vc_fd_locks[WINSOCK_HANDLE_HASH(ct->ct_fd)] = GetCurrentThreadId();
            mutex_unlock(&clnt_fd_lock);

        if (cl->shutdown) {
            fprintf(stdout, "%04x: callback received shutdown signal\n", GetCurrentThreadId());
            release_fd_lock(ct->ct_fd, mask);
            goto out;
        }

        saved_timeout_sec = ct->ct_wait.tv_sec;
        saved_timeout_usec = ct->ct_wait.tv_usec;
        xdrs->x_op = XDR_DECODE;
        if (ct->use_stored_reply_msg && ct->reply_msg.rm_direction == CALL) {
            goto process_rpc_call;
        } else if (!ct->use_stored_reply_msg) {
            ct->ct_wait.tv_sec = ct->ct_wait.tv_usec = 0;
            __xdrrec_setnonblock(xdrs, 0);
                    if (!xdrrec_skiprecord(xdrs))
                goto skip_process;
            if (!xdr_getxiddir(xdrs, &ct->reply_msg)) {
                goto skip_process;
            }
            if (ct->reply_msg.rm_direction == CALL) {
                goto process_rpc_call;
            } else {
                if (ct->reply_msg.rm_direction == REPLY)
                    ct->use_stored_reply_msg = TRUE;
                goto skip_setlastfrag;
            }
        } else {
            goto skip_setlastfrag;
        }
process_rpc_call:
        //call to get call headers
        ct->use_stored_reply_msg = FALSE;
        ct->reply_msg.rm_call.cb_cred.oa_base = cred_area;
        ct->reply_msg.rm_call.cb_verf.oa_base = &(cred_area[MAX_AUTH_BYTES]);
        if (!xdr_getcallbody(xdrs, &ct->reply_msg)) {
            fprintf(stderr, "%04x: xdr_getcallbody failed\n", GetCurrentThreadId());            
            goto skip_process;
        } else 
            fprintf(stdout, "%04x: callbody: rpcvers %d cb_prog %d cb_vers %d cb_proc %d\n", 
                GetCurrentThreadId(), 
                ct->reply_msg.rm_call.cb_rpcvers, ct->reply_msg.rm_call.cb_prog,
                ct->reply_msg.rm_call.cb_vers, ct->reply_msg.rm_call.cb_proc);
        header.rq_prog = ct->reply_msg.rm_call.cb_prog;
        header.rq_vers = ct->reply_msg.rm_call.cb_vers;
        header.rq_proc = ct->reply_msg.rm_call.cb_proc;
        header.xdr = xdrs;
        status = (*cl->cb_fn)(cl->cb_args, &header, &res);
        if (status) {
            fprintf(stderr, "%04x: callback function failed with %d\n", status);
        }
        
        xdrs->x_op = XDR_ENCODE;
        __xdrrec_setblock(xdrs);
        reply_msg.rm_xid = ct->reply_msg.rm_xid;
        fprintf(stdout, "%04x: cb: replying to xid %d\n", GetCurrentThreadId(), 
            ct->reply_msg.rm_xid);
        ct->reply_msg.rm_xid = 0;
        reply_msg.rm_direction = REPLY;
        reply_msg.rm_reply.rp_stat = MSG_ACCEPTED;
        reply_msg.acpted_rply.ar_verf = _null_auth;
        reply_msg.acpted_rply.ar_stat = status;
        reply_msg.acpted_rply.ar_results.where = NULL;
        reply_msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void;
        xdr_replymsg(xdrs, &reply_msg);
        if (!status) {
            (*cl->cb_xdr)(xdrs, res); /* encode the results */
            xdrs->x_op = XDR_FREE;
            (*cl->cb_xdr)(xdrs, res); /* free the results */
        }
        if (! xdrrec_endofrecord(xdrs, 1)) {
            fprintf(stderr, "%04x: failed to send REPLY\n", GetCurrentThreadId());
        }
skip_process:
        ct->reply_msg.rm_direction = -1;
        xdrrec_setlastfrag(xdrs);
skip_setlastfrag:
        ct->ct_wait.tv_sec = saved_timeout_sec;
        ct->ct_wait.tv_usec = saved_timeout_usec;
        release_fd_lock(ct->ct_fd, mask);
    }
out:
    return status;
}
/*
 * Create a client handle for a connection.
 * Default options are set, which the user can change using clnt_control()'s.
 * The rpc/vc package does buffering similar to stdio, so the client
 * must pick send and receive buffer sizes, 0 => use the default.
 * NB: fd is copied into a private area.
 * NB: The rpch->cl_auth is set null authentication. Caller may wish to
 * set this something more useful.
 *
 * fd should be an open socket
 */
CLIENT *
clnt_vc_create(fd, raddr, prog, vers, sendsz, recvsz, cb_xdr, cb_fn, cb_args)
        int fd;                         /* open file descriptor */
        const struct netbuf *raddr;     /* servers address */
        const rpcprog_t prog;                   /* program number */
        const rpcvers_t vers;                   /* version number */
        u_int sendsz;                   /* buffer recv size */
        u_int recvsz;                   /* buffer send size */
    int (*cb_xdr)(void *, void *); /* if not NULL, point to function to xdr CB args */
    int (*cb_fn)(void *, void *, void **);   /* if not NULL, pointer to function to handle RPC_CALLs */
    void *cb_args;          /* if not NULL, pointer to pass into cb_fn */
{
        CLIENT *cl;                     /* client handle */
        struct ct_data *ct = NULL;      /* client handle */
        struct timeval now;
        struct rpc_msg call_msg;
        static u_int32_t disrupt;
#ifndef _WIN32
        sigset_t mask;
        sigset_t newmask;
#else
        /* XXX Need Windows signal/event stuff XXX */
#endif
        struct sockaddr_storage ss;
        socklen_t slen;
        struct __rpc_sockinfo si;

        if (disrupt == 0)
                disrupt = PtrToUlong(raddr);

        cl = (CLIENT *)mem_alloc(sizeof (*cl));
        ct = (struct ct_data *)mem_alloc(sizeof (*ct));
        if ((cl == (CLIENT *)NULL) || (ct == (struct ct_data *)NULL)) {
//              (void) syslog(LOG_ERR, clnt_vc_errstr,
//                  clnt_vc_str, __no_mem_str);
                rpc_createerr.cf_stat = RPC_SYSTEMERROR;
                rpc_createerr.cf_error.re_errno = errno;
                goto err;
        }
        ct->ct_addr.buf = NULL;
#ifndef _WIN32
        sigfillset(&newmask);
        thr_sigsetmask(SIG_SETMASK, &newmask, &mask);
#else
        /* XXX Need Windows signal/event stuff XXX */
#endif
        mutex_lock(&clnt_fd_lock);
        if (vc_fd_locks == (int *) NULL) {
                int cv_allocsz, fd_allocsz;
                int dtbsize = __rpc_dtbsize();

                fd_allocsz = dtbsize * sizeof (int);
                vc_fd_locks = (int *) mem_alloc(fd_allocsz);
                if (vc_fd_locks == (int *) NULL) {
                        mutex_unlock(&clnt_fd_lock);
//                      thr_sigsetmask(SIG_SETMASK, &(mask), NULL);
                        goto err;
                } else
                        memset(vc_fd_locks, 0, fd_allocsz);

                assert(vc_cv == (cond_t *) NULL);
                cv_allocsz = dtbsize * sizeof (cond_t);
                vc_cv = (cond_t *) mem_alloc(cv_allocsz);
                if (vc_cv == (cond_t *) NULL) {
                        mem_free(vc_fd_locks, fd_allocsz);
                        vc_fd_locks = (int *) NULL;
                        mutex_unlock(&clnt_fd_lock);
//                      thr_sigsetmask(SIG_SETMASK, &(mask), NULL);
                        goto err;
                } else {
                        int i;

                        for (i = 0; i < dtbsize; i++)
                                cond_init(&vc_cv[i], 0, (void *) 0);
                }
        } else
                assert(vc_cv != (cond_t *) NULL);

        /*
         * XXX - fvdl connecting while holding a mutex?
         */
        slen = sizeof ss;
        if (getpeername(fd, (struct sockaddr *)&ss, &slen) == SOCKET_ERROR) {
                errno = WSAGetLastError();
                if (errno != WSAENOTCONN) {
                        rpc_createerr.cf_stat = RPC_SYSTEMERROR;
                        rpc_createerr.cf_error.re_errno = errno;
                        mutex_unlock(&clnt_fd_lock);
//                      thr_sigsetmask(SIG_SETMASK, &(mask), NULL);
                        goto err;
                }
                if (connect(fd, (struct sockaddr *)raddr->buf, raddr->len) == SOCKET_ERROR){
                        rpc_createerr.cf_stat = RPC_SYSTEMERROR;
                        rpc_createerr.cf_error.re_errno = WSAGetLastError();
                        mutex_unlock(&clnt_fd_lock);
//                      thr_sigsetmask(SIG_SETMASK, &(mask), NULL);
                        goto err;
                }
        }
        mutex_unlock(&clnt_fd_lock);
        if (!__rpc_fd2sockinfo(fd, &si))
                goto err;
//      thr_sigsetmask(SIG_SETMASK, &(mask), NULL);

        ct->ct_closeit = FALSE;

        /*
         * Set up private data struct
         */
        ct->ct_fd = fd;
        ct->ct_wait.tv_usec = 0;
        ct->ct_waitset = FALSE;
        ct->ct_addr.buf = malloc(raddr->maxlen);
        if (ct->ct_addr.buf == NULL)
                goto err;
        memcpy(ct->ct_addr.buf, raddr->buf, raddr->len);
        ct->ct_addr.len = raddr->len;
        ct->ct_addr.maxlen = raddr->maxlen;
    ct->use_stored_reply_msg = FALSE;

        /*
         * Initialize call message
         */
        (void)gettimeofday(&now, NULL);
        call_msg.rm_xid = ((u_int32_t)++disrupt) ^ __RPC_GETXID(&now);
        call_msg.rm_direction = CALL;
        call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
        call_msg.rm_call.cb_prog = (u_int32_t)prog;
        call_msg.rm_call.cb_vers = (u_int32_t)vers;

        /*
         * pre-serialize the static part of the call msg and stash it away
         */
        xdrmem_create(&(ct->ct_xdrs), ct->ct_u.ct_mcallc, MCALL_MSG_SIZE,
            XDR_ENCODE);
        if (! xdr_callhdr(&(ct->ct_xdrs), &call_msg)) {
                if (ct->ct_closeit) {
                        (void)closesocket(fd);
                }
                goto err;
        }
        ct->ct_mpos = XDR_GETPOS(&(ct->ct_xdrs));
        XDR_DESTROY(&(ct->ct_xdrs));

        /*
         * Create a client handle which uses xdrrec for serialization
         * and authnone for authentication.
         */
        cl->cl_ops = clnt_vc_ops();
        cl->cl_private = ct;
        cl->cl_auth = authnone_create();
        sendsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsz);
        recvsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsz);
        xdrrec_create(&(ct->ct_xdrs), sendsz, recvsz,
            cl->cl_private, read_vc, write_vc);

    if (cb_xdr && cb_fn && cb_args) {
        cl->cb_xdr = cb_xdr;
        cl->cb_fn = cb_fn;
        cl->cb_args = cb_args;
        cl->cb_thread = (HANDLE)_beginthreadex(NULL,
            0, clnt_cb_thread, cl, 0, NULL);
        if (cl->cb_thread == INVALID_HANDLE_VALUE) {
            fprintf(stderr, "_beginthreadex failed %d\n", GetLastError());
            goto err;
        } else
            fprintf(stdout, "%04x: started the callback thread %04x\n", 
                GetCurrentThreadId(), cl->cb_thread);
    } else
        cl->cb_thread = INVALID_HANDLE_VALUE;
        return (cl);

err:
        if (cl) {
                if (ct) {
                        if (ct->ct_addr.len)
                                mem_free(ct->ct_addr.buf, ct->ct_addr.len);
                        mem_free(ct, sizeof (struct ct_data));
                }
                if (cl)
                        mem_free(cl, sizeof (CLIENT));
        }
        return ((CLIENT *)NULL);
}

static enum clnt_stat
clnt_vc_call(cl, proc, xdr_args, args_ptr, xdr_results, results_ptr, timeout)
        CLIENT *cl;
        rpcproc_t proc;
        xdrproc_t xdr_args;
        void *args_ptr;
        xdrproc_t xdr_results;
        void *results_ptr;
        struct timeval timeout;
{
        struct ct_data *ct = (struct ct_data *) cl->cl_private;
        XDR *xdrs = &(ct->ct_xdrs);
        u_int32_t x_id;
        u_int32_t *msg_x_id = &ct->ct_u.ct_mcalli;    /* yuk */
        bool_t shipnow;
        static int refreshes = 2;
    u_int seq = -1;
    time_t start_send, time_now;
#ifndef _WIN32
        sigset_t mask, newmask;
#else
        /* XXX Need Windows signal/event stuff XXX */
#endif
    enum clnt_stat status;

        assert(cl != NULL);

#ifndef _WIN32
        sigfillset(&newmask);
        thr_sigsetmask(SIG_SETMASK, &newmask, &mask);
#else
        /* XXX Need Windows signal/event stuff XXX */
#endif

    acquire_fd_lock(ct->ct_fd);

        if (!ct->ct_waitset) {
                /* If time is not within limits, we ignore it. */
                if (time_not_ok(&timeout) == FALSE)
                        ct->ct_wait = timeout;
        }

        shipnow =
            (xdr_results == NULL && timeout.tv_sec == 0
            && timeout.tv_usec == 0) ? FALSE : TRUE;

call_again:
    __xdrrec_setblock(xdrs);
        xdrs->x_op = XDR_ENCODE;
        ct->ct_error.re_status = RPC_SUCCESS;
        x_id = ntohl(--(*msg_x_id));

        if ((! XDR_PUTBYTES(xdrs, ct->ct_u.ct_mcallc, ct->ct_mpos)) ||
            (! XDR_PUTINT32(xdrs, (int32_t *)&proc)) ||
            (! AUTH_MARSHALL(cl->cl_auth, xdrs, &seq)) ||
            (! AUTH_WRAP(cl->cl_auth, xdrs, xdr_args, args_ptr))) {
                if (ct->ct_error.re_status == RPC_SUCCESS)
                        ct->ct_error.re_status = RPC_CANTENCODEARGS;
                (void)xdrrec_endofrecord(xdrs, TRUE);
        goto out;
        }

        if (! xdrrec_endofrecord(xdrs, shipnow)) {
        ct->ct_error.re_status = RPC_CANTSEND;
        goto out;
        }
        if (! shipnow) {
                release_fd_lock(ct->ct_fd, mask);
                return (RPC_SUCCESS);
        }

#ifdef NO_CB_4_KRB5P
    if (cl->cb_thread != INVALID_HANDLE_VALUE)
        release_fd_lock(ct->ct_fd, mask);
#endif
        /*
         * Keep receiving until we get a valid transaction id
         */

    time(&start_send);
        while (TRUE) {
#ifdef NO_CB_4_KRB5P
        if (cl->cb_thread != INVALID_HANDLE_VALUE) {
            mutex_lock(&clnt_fd_lock);
                while ((vc_fd_locks[WINSOCK_HANDLE_HASH(ct->ct_fd)] && 
                    vc_fd_locks[WINSOCK_HANDLE_HASH(ct->ct_fd)] != GetCurrentThreadId()) || 
                    (ct->reply_msg.rm_xid && ct->reply_msg.rm_xid != x_id))
                        cond_wait(&vc_cv[WINSOCK_HANDLE_HASH(ct->ct_fd)], &clnt_fd_lock);
                vc_fd_locks[WINSOCK_HANDLE_HASH(ct->ct_fd)] = GetCurrentThreadId();
                mutex_unlock(&clnt_fd_lock);
        }
#endif
        __xdrrec_setnonblock(xdrs, 0);
        xdrs->x_op = XDR_DECODE;
                ct->reply_msg.acpted_rply.ar_verf = _null_auth;
                ct->reply_msg.acpted_rply.ar_results.where = NULL;
                ct->reply_msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void;
        if (!ct->use_stored_reply_msg) {
                    if (!xdrrec_skiprecord(xdrs)) {
                if (ct->ct_error.re_status != RPC_CANTRECV) {
                    time(&time_now);
                    if (time_now - start_send >= timeout.tv_sec) {
                        ct->ct_error.re_status = RPC_TIMEDOUT;
                        goto out;
                    }
#ifdef NO_CB_4_KRB5P
                    if (cl->cb_thread != INVALID_HANDLE_VALUE)  
#endif
                                    release_fd_lock(ct->ct_fd, mask);
                    SwitchToThread();
                                continue;
                }
                goto out;
                    }
            if (!xdr_getxiddir(xdrs, &ct->reply_msg)) {
                            if (ct->ct_error.re_status == RPC_SUCCESS) {
#ifdef NO_CB_4_KRB5P
                    if (cl->cb_thread != INVALID_HANDLE_VALUE)  
#endif
                        release_fd_lock(ct->ct_fd, mask);
                    SwitchToThread();
                    continue;
                }
                goto out;
            } 

            if (ct->reply_msg.rm_direction != REPLY) {
                if (cl->cb_thread == INVALID_HANDLE_VALUE) {
                    ct->reply_msg.rm_xid = 0;
                } else {
                    ct->use_stored_reply_msg = TRUE;
                }
                release_fd_lock(ct->ct_fd, mask);
                SwitchToThread();
                continue;
            }
        }
                if (ct->reply_msg.rm_xid == x_id) {
            ct->use_stored_reply_msg = FALSE;
            ct->reply_msg.rm_xid = 0;
            if (!xdr_getreplyunion(xdrs, &ct->reply_msg))
                goto out;
                        break;
        }
        else {
            time(&time_now);
            if (time_now - start_send >= timeout.tv_sec) {
                ct->ct_error.re_status = RPC_TIMEDOUT;
                goto out;
            }
            ct->use_stored_reply_msg = TRUE;
#ifdef NO_CB_4_KRB5P
            if (cl->cb_thread != INVALID_HANDLE_VALUE)  
#endif
                release_fd_lock(ct->ct_fd, mask);
            SwitchToThread();
        }
        }

        /*
         * process header
         */
        _seterr_reply(&ct->reply_msg, &(ct->ct_error));
        if (ct->ct_error.re_status == RPC_SUCCESS) {
                if (! AUTH_VALIDATE(cl->cl_auth,
                    &ct->reply_msg.acpted_rply.ar_verf, seq)) {
                        ct->ct_error.re_status = RPC_AUTHERROR;
                        ct->ct_error.re_why = AUTH_INVALIDRESP;
        }
        else if (! AUTH_UNWRAP(cl->cl_auth, xdrs, xdr_results, results_ptr, seq)) {
                        if (ct->ct_error.re_status == RPC_SUCCESS)
                                ct->ct_error.re_status = RPC_CANTDECODERES;
                }
                /* free verifier ... */
                if (ct->reply_msg.acpted_rply.ar_verf.oa_base != NULL) {
                        xdrs->x_op = XDR_FREE;
                        (void)xdr_opaque_auth(xdrs,
                            &(ct->reply_msg.acpted_rply.ar_verf));
                }
        }  /* end successful completion */
        else {
                if (ct->reply_msg.acpted_rply.ar_verf.oa_base != NULL) {
                        xdrs->x_op = XDR_FREE;
                        (void)xdr_opaque_auth(xdrs,
                            &(ct->reply_msg.acpted_rply.ar_verf));
                }
                /* maybe our credentials need to be refreshed ... */
                if (refreshes-- > 0 && AUTH_REFRESH(cl->cl_auth, &ct->reply_msg))
                        goto call_again;
        }  /* end of unsuccessful completion */
    ct->reply_msg.rm_direction = -1;
out:
    status = ct->ct_error.re_status;
        release_fd_lock(ct->ct_fd, mask);
        return status;
}

static void
clnt_vc_geterr(cl, errp)
        CLIENT *cl;
        struct rpc_err *errp;
{
        struct ct_data *ct;

        assert(cl != NULL);
        assert(errp != NULL);

        ct = (struct ct_data *) cl->cl_private;
        *errp = ct->ct_error;
}

static bool_t
clnt_vc_freeres(cl, xdr_res, res_ptr)
        CLIENT *cl;
        xdrproc_t xdr_res;
        void *res_ptr;
{
        struct ct_data *ct;
        XDR *xdrs;
        bool_t dummy;
#ifndef _WIN32
        sigset_t mask;
        sigset_t newmask;
#else
        /* XXX Need Windows signal/event stuff XXX */
#endif

        assert(cl != NULL);

        ct = (struct ct_data *)cl->cl_private;
        xdrs = &(ct->ct_xdrs);

#ifndef _WIN32
        sigfillset(&newmask);
        thr_sigsetmask(SIG_SETMASK, &newmask, &mask);
#else
        /* XXX Need Windows signal/event stuff XXX */
#endif
        mutex_lock(&clnt_fd_lock);
        while (vc_fd_locks[WINSOCK_HANDLE_HASH(ct->ct_fd)])
                cond_wait(&vc_cv[WINSOCK_HANDLE_HASH(ct->ct_fd)], &clnt_fd_lock);
        xdrs->x_op = XDR_FREE;
        dummy = (*xdr_res)(xdrs, res_ptr);
        mutex_unlock(&clnt_fd_lock);
//      thr_sigsetmask(SIG_SETMASK, &(mask), NULL);
        cond_signal(&vc_cv[WINSOCK_HANDLE_HASH(ct->ct_fd)]);

        return dummy;
}

/*ARGSUSED*/
static void
clnt_vc_abort(cl)
        CLIENT *cl;
{
}

static bool_t
clnt_vc_control(cl, request, info)
        CLIENT *cl;
        u_int request;
        void *info;
{
        struct ct_data *ct;
        void *infop = info;
#ifndef _WIN32
        sigset_t mask;
        sigset_t newmask;
#else
        /* XXX Need Windows signal/event stuff XXX */
#endif

        assert(cl != NULL);

        ct = (struct ct_data *)cl->cl_private;

#ifndef _WIN32
        sigfillset(&newmask);
        thr_sigsetmask(SIG_SETMASK, &newmask, &mask);
#else
        /* XXX Need Windows signal/event stuff XXX */
#endif
    acquire_fd_lock(ct->ct_fd);

        switch (request) {
        case CLSET_FD_CLOSE:
                ct->ct_closeit = TRUE;
                release_fd_lock(ct->ct_fd, mask);
                return (TRUE);
        case CLSET_FD_NCLOSE:
                ct->ct_closeit = FALSE;
                release_fd_lock(ct->ct_fd, mask);
                return (TRUE);
        default:
                break;
        }

        /* for other requests which use info */
        if (info == NULL) {
                release_fd_lock(ct->ct_fd, mask);
                return (FALSE);
        }
        switch (request) {
        case CLSET_TIMEOUT:
                if (time_not_ok((struct timeval *)info)) {
                        release_fd_lock(ct->ct_fd, mask);
                        return (FALSE);
                }
                ct->ct_wait = *(struct timeval *)infop;
                ct->ct_waitset = TRUE;
                break;
        case CLGET_TIMEOUT:
                *(struct timeval *)infop = ct->ct_wait;
                break;
        case CLGET_SERVER_ADDR:
                (void) memcpy(info, ct->ct_addr.buf, (size_t)ct->ct_addr.len);
                break;
        case CLGET_FD:
                *(int *)info = ct->ct_fd;
                break;
        case CLGET_SVC_ADDR:
                /* The caller should not free this memory area */
                *(struct netbuf *)info = ct->ct_addr;
                break;
        case CLSET_SVC_ADDR:            /* set to new address */
                release_fd_lock(ct->ct_fd, mask);
                return (FALSE);
        case CLGET_XID:
                /*
                 * use the knowledge that xid is the
                 * first element in the call structure
                 * This will get the xid of the PREVIOUS call
                 */
                *(u_int32_t *)info =
                    ntohl(*(u_int32_t *)(void *)&ct->ct_u.ct_mcalli);
                break;
        case CLSET_XID:
                /* This will set the xid of the NEXT call */
                *(u_int32_t *)(void *)&ct->ct_u.ct_mcalli =
                    htonl(*((u_int32_t *)info) + 1);
                /* increment by 1 as clnt_vc_call() decrements once */
                break;
        case CLGET_VERS:
                /*
                 * This RELIES on the information that, in the call body,
                 * the version number field is the fifth field from the
                 * begining of the RPC header. MUST be changed if the
                 * call_struct is changed
                 */
                *(u_int32_t *)info =
                    ntohl(*(u_int32_t *)(void *)(ct->ct_u.ct_mcallc +
                    4 * BYTES_PER_XDR_UNIT));
                break;

        case CLSET_VERS:
                *(u_int32_t *)(void *)(ct->ct_u.ct_mcallc +
                    4 * BYTES_PER_XDR_UNIT) =
                    htonl(*(u_int32_t *)info);
                break;

        case CLGET_PROG:
                /*
                 * This RELIES on the information that, in the call body,
                 * the program number field is the fourth field from the
                 * begining of the RPC header. MUST be changed if the
                 * call_struct is changed
                 */
                *(u_int32_t *)info =
                    ntohl(*(u_int32_t *)(void *)(ct->ct_u.ct_mcallc +
                    3 * BYTES_PER_XDR_UNIT));
                break;

        case CLSET_PROG:
                *(u_int32_t *)(void *)(ct->ct_u.ct_mcallc +
                    3 * BYTES_PER_XDR_UNIT) =
                    htonl(*(u_int32_t *)info);
                break;

        default:
                release_fd_lock(ct->ct_fd, mask);
                return (FALSE);
        }
        release_fd_lock(ct->ct_fd, mask);
        return (TRUE);
}


static void
clnt_vc_destroy(cl)
        CLIENT *cl;
{
        struct ct_data *ct = (struct ct_data *) cl->cl_private;
        int ct_fd = ct->ct_fd;
#ifndef _WIN32
        sigset_t mask;
        sigset_t newmask;
#else
        /* XXX Need Windows signal/event stuff XXX */
#endif

        assert(cl != NULL);

        ct = (struct ct_data *) cl->cl_private;

#ifndef _WIN32
        sigfillset(&newmask);
        thr_sigsetmask(SIG_SETMASK, &newmask, &mask);
#else
        /* XXX Need Windows signal/event stuff XXX */
#endif
        mutex_lock(&clnt_fd_lock);
        while (vc_fd_locks[WINSOCK_HANDLE_HASH(ct_fd)])
                cond_wait(&vc_cv[WINSOCK_HANDLE_HASH(ct_fd)], &clnt_fd_lock);

    if (cl->cb_thread != INVALID_HANDLE_VALUE) {
        int status;
        fprintf(stdout, "%04x: sending shutdown to callback thread %04x\n", 
            GetCurrentThreadId(), cl->cb_thread);
        cl->shutdown = 1;
        mutex_unlock(&clnt_fd_lock);
        cond_signal(&vc_cv[WINSOCK_HANDLE_HASH(ct_fd)]);
        status = WaitForSingleObject(cl->cb_thread, INFINITE);
        fprintf(stdout, "%04x: terminated callback thread\n", GetCurrentThreadId());
        mutex_lock(&clnt_fd_lock);
        while (vc_fd_locks[WINSOCK_HANDLE_HASH(ct_fd)])
            cond_wait(&vc_cv[WINSOCK_HANDLE_HASH(ct_fd)], &clnt_fd_lock);
    }

        if (ct->ct_closeit && ct->ct_fd != -1) {
                (void)closesocket(ct->ct_fd);
        }
        XDR_DESTROY(&(ct->ct_xdrs));
        if (ct->ct_addr.buf)
                free(ct->ct_addr.buf);
        mem_free(ct, sizeof(struct ct_data));
        if (cl->cl_netid && cl->cl_netid[0])
                mem_free(cl->cl_netid, strlen(cl->cl_netid) +1);
        if (cl->cl_tp && cl->cl_tp[0])
                mem_free(cl->cl_tp, strlen(cl->cl_tp) +1);
        mem_free(cl, sizeof(CLIENT));
        mutex_unlock(&clnt_fd_lock);
//      thr_sigsetmask(SIG_SETMASK, &(mask), NULL);
        cond_signal(&vc_cv[WINSOCK_HANDLE_HASH(ct_fd)]);
}

/*
 * Interface between xdr serializer and tcp connection.
 * Behaves like the system calls, read & write, but keeps some error state
 * around for the rpc level.
 */
static int
read_vc(ctp, buf, len)
        void *ctp;
        void *buf;
        int len;
{
        /*
        struct sockaddr sa;
        socklen_t sal;
        */
        struct ct_data *ct = (struct ct_data *)ctp;
        struct pollfd fd;
        int milliseconds = ct->ct_wait.tv_usec;

        if (len == 0)
                return (0);
        fd.fd = ct->ct_fd;
        fd.events = POLLIN;
        for (;;) {
#ifndef __REACTOS__
                switch (poll(&fd, 1, milliseconds)) {
#else
                /* ReactOS: use select instead of poll */
                fd_set infd;
                struct timeval timeout;

                FD_ZERO(&infd);
                FD_SET(ct->ct_fd, &infd);

                timeout.tv_sec = 0;
                timeout.tv_usec = milliseconds * 1000;

                switch (select(0, &infd, NULL, NULL, &timeout)) {
#endif

                case 0:
                        ct->ct_error.re_status = RPC_TIMEDOUT;
                        return (-1);

                case SOCKET_ERROR:
                        errno = WSAGetLastError();
                        if (errno == WSAEINTR)
                                continue;
                        ct->ct_error.re_status = RPC_CANTRECV;
                        ct->ct_error.re_errno = errno;
                        return (-2);
                }
                break;
        }

        len = recv(ct->ct_fd, buf, (size_t)len, 0);
        errno = WSAGetLastError();

        switch (len) {
        case 0:
                /* premature eof */
                ct->ct_error.re_errno = WSAECONNRESET;
                ct->ct_error.re_status = RPC_CANTRECV;
                len = -1;  /* it's really an error */
                break;

        case SOCKET_ERROR:
                ct->ct_error.re_errno = errno;
                ct->ct_error.re_status = RPC_CANTRECV;
                break;
        }
        return (len);
}

static int
#ifndef __REACTOS__
write_vc(ctp, buf, len)
#else
write_vc(ctp, ptr, len)
#endif
        void *ctp;
#ifndef __REACTOS__
        char *buf;
#else
    void *ptr;
#endif
        int len;
{
        struct ct_data *ct = (struct ct_data *)ctp;
        int i = 0, cnt;
#ifdef __REACTOS__
    char *buf = ptr;
#endif

        for (cnt = len; cnt > 0; cnt -= i, buf += i) {
            if ((i = send(ct->ct_fd, buf, (size_t)cnt, 0)) == SOCKET_ERROR) {
                ct->ct_error.re_errno = WSAGetLastError();
                ct->ct_error.re_status = RPC_CANTSEND;
                return (-1);
            }
        }
        return (len);
}

static struct clnt_ops *
clnt_vc_ops()
{
        static struct clnt_ops ops;
        extern mutex_t  ops_lock;
#ifndef _WIN32
        sigset_t mask, newmask;

        /* VARIABLES PROTECTED BY ops_lock: ops */

        sigfillset(&newmask);
        thr_sigsetmask(SIG_SETMASK, &newmask, &mask);
#else
        /* XXX Need Windows signal/event stuff XXX */
#endif
        mutex_lock(&ops_lock);
        if (ops.cl_call == NULL) {
                ops.cl_call = clnt_vc_call;
                ops.cl_abort = clnt_vc_abort;
                ops.cl_geterr = clnt_vc_geterr;
                ops.cl_freeres = clnt_vc_freeres;
                ops.cl_destroy = clnt_vc_destroy;
                ops.cl_control = clnt_vc_control;
        }
        mutex_unlock(&ops_lock);
//      thr_sigsetmask(SIG_SETMASK, &(mask), NULL);
        return (&ops);
}

/*
 * Make sure that the time is not garbage.   -1 value is disallowed.
 * Note this is different from time_not_ok in clnt_dg.c
 */
static bool_t
time_not_ok(t)
        struct timeval *t;
{
        return (t->tv_sec <= -1 || t->tv_sec > 100000000 ||
                t->tv_usec <= -1 || t->tv_usec > 1000000);
}