/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
 * Portions of this source code were derived from Berkeley
 * 4.3 BSD under license from the Regents of the University of
 * California.
 */

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

#include "mt.h"
#include "rpc_mt.h"
#include <stdio.h>
#include <errno.h>
#include <rpc/rpc.h>
#include <string.h>
#include <sys/param.h>
#include <stdlib.h>
#include <unistd.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 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);
        }
}

/*
 * 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.
 */
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 *netclass)
{
        struct rpc_call_private *rcp;
        enum clnt_stat clnt_stat;
        struct timeval timeout, tottimeout;
        static pthread_key_t rpc_call_key = PTHREAD_ONCE_KEY_NP;
        char nettype_array[NETIDLEN];
        char *nettype = &nettype_array[0];

        if (netclass == NULL)
                nettype = NULL;
        else {
                size_t len = strlen(netclass);
                if (len >= sizeof (nettype_array)) {
                        rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
                        return (rpc_createerr.cf_stat);
                }
                (void) strcpy(nettype, netclass);
        }

        rcp = thr_get_storage(&rpc_call_key, sizeof (*rcp), rpc_call_destroy);
        if (rcp == NULL) {
                rpc_createerr.cf_stat = RPC_SYSTEMERROR;
                rpc_createerr.cf_error.re_errno = errno;
                return (rpc_createerr.cf_stat);
        }

        if ((nettype == NULL) || (nettype[0] == '\0'))
                nettype = "netpath";
        if (!(rcp->valid &&
            rcp->pid == getpid() &&
            rcp->prognum == prognum &&
            rcp->versnum == versnum &&
            strcmp(rcp->host, host) == 0 &&
            strcmp(rcp->nettype, nettype) == 0)) {
                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 *)&timeout);
                if (CLNT_CONTROL(rcp->client, CLGET_FD, (char *)&fd))
                        (void) fcntl(fd, F_SETFD, 1);   /* 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;
        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);
}