/*      $NetBSD: clnt_simple.c,v 1.21 2000/07/06 03:10:34 christos 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.
 */
/*
 * Copyright (c) 1986-1991 by Sun Microsystems Inc. 
 */

/*
 * clnt_simple.c
 * Simplified front end to client rpc.
 *
 */

#include "namespace.h"
#include "reentrant.h"
#include <sys/param.h>
#include <stdio.h>
#include <errno.h>
#include <rpc/rpc.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include "un-namespace.h"
#include "mt_misc.h"

#ifndef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN 64
#endif

#ifndef NETIDLEN
#define NETIDLEN 32
#endif

struct rpc_call_private {
        int     valid;                  /* Is this entry valid ? */
        CLIENT  *client;                /* Client handle */
        pid_t   pid;                    /* process-id at moment of creation */
        rpcprog_t prognum;              /* Program */
        rpcvers_t versnum;              /* Version */
        char    host[MAXHOSTNAMELEN];   /* Servers host */
        char    nettype[NETIDLEN];      /* Network type */
};
static struct rpc_call_private *rpc_call_private_main;
static thread_key_t rpc_call_key;
static once_t rpc_call_once = ONCE_INITIALIZER;
static int rpc_call_key_error;

static void rpc_call_key_init(void);
static void rpc_call_destroy(void *);

static void
rpc_call_destroy(void *vp)
{
        struct rpc_call_private *rcp = (struct rpc_call_private *)vp;

        if (rcp) {
                if (rcp->client)
                        CLNT_DESTROY(rcp->client);
                free(rcp);
        }
}

static void
rpc_call_key_init(void)
{

        rpc_call_key_error = thr_keycreate(&rpc_call_key, rpc_call_destroy);
}

/*
 * This is the simplified interface to the client rpc layer.
 * The client handle is not destroyed here and is reused for
 * the future calls to same prog, vers, host and nettype combination.
 *
 * The total time available is 25 seconds.
 *
 * host    - host name 
 * prognum - program number 
 * versnum - version number 
 * procnum - procedure number 
 * inproc, outproc -  in/out XDR procedures 
 * in, out - recv/send data 
 * nettype - nettype
 */
enum clnt_stat
rpc_call(const char *host, const rpcprog_t prognum, const rpcvers_t versnum,
    const rpcproc_t procnum, const xdrproc_t inproc, const char *in,
    const xdrproc_t outproc, char *out, const char *nettype)
{
        struct rpc_call_private *rcp = (struct rpc_call_private *) 0;
        enum clnt_stat clnt_stat;
        struct timeval timeout, tottimeout;
        int main_thread = 1;

        if ((main_thread = thr_main())) {
                rcp = rpc_call_private_main;
        } else {
                if (thr_once(&rpc_call_once, rpc_call_key_init) != 0 ||
                    rpc_call_key_error != 0) {
                        rpc_createerr.cf_stat = RPC_SYSTEMERROR;
                        rpc_createerr.cf_error.re_errno = rpc_call_key_error;
                        return (rpc_createerr.cf_stat);
                }
                rcp = (struct rpc_call_private *)thr_getspecific(rpc_call_key);
        }
        if (rcp == NULL) {
                rcp = malloc(sizeof (*rcp));
                if (rcp == NULL) {
                        rpc_createerr.cf_stat = RPC_SYSTEMERROR;
                        rpc_createerr.cf_error.re_errno = errno;
                        return (rpc_createerr.cf_stat);
                }
                if (main_thread)
                        rpc_call_private_main = rcp;
                else
                        thr_setspecific(rpc_call_key, (void *) rcp);
                rcp->valid = 0;
                rcp->client = NULL;
        }
        if ((nettype == NULL) || (nettype[0] == 0))
                nettype = "netpath";
        if (!(rcp->valid && rcp->pid == getpid() &&
                (rcp->prognum == prognum) &&
                (rcp->versnum == versnum) &&
                (!strcmp(rcp->host, host)) &&
                (!strcmp(rcp->nettype, nettype)))) {
                int fd;

                rcp->valid = 0;
                if (rcp->client)
                        CLNT_DESTROY(rcp->client);
                /*
                 * Using the first successful transport for that type
                 */
                rcp->client = clnt_create(host, prognum, versnum, nettype);
                rcp->pid = getpid();
                if (rcp->client == NULL) {
                        return (rpc_createerr.cf_stat);
                }
                /*
                 * Set time outs for connectionless case.  Do it
                 * unconditionally.  Faster than doing a t_getinfo()
                 * and then doing the right thing.
                 */
                timeout.tv_usec = 0;
                timeout.tv_sec = 5;
                (void) CLNT_CONTROL(rcp->client,
                                CLSET_RETRY_TIMEOUT, (char *)(void *)&timeout);
                if (CLNT_CONTROL(rcp->client, CLGET_FD, (char *)(void *)&fd))
                        _fcntl(fd, F_SETFD, 1); /* make it "close on exec" */
                rcp->prognum = prognum;
                rcp->versnum = versnum;
                if ((strlen(host) < (size_t)MAXHOSTNAMELEN) &&
                    (strlen(nettype) < (size_t)NETIDLEN)) {
                        (void) strcpy(rcp->host, host);
                        (void) strcpy(rcp->nettype, nettype);
                        rcp->valid = 1;
                } else {
                        rcp->valid = 0;
                }
        } /* else reuse old client */
        tottimeout.tv_sec = 25;
        tottimeout.tv_usec = 0;
        /*LINTED const castaway*/
        clnt_stat = CLNT_CALL(rcp->client, procnum, inproc, (char *) in,
            outproc, out, tottimeout);
        /*
         * if call failed, empty cache
         */
        if (clnt_stat != RPC_SUCCESS)
                rcp->valid = 0;
        return (clnt_stat);
}