/*      $NetBSD: clnt_simple.c,v 1.33 2015/01/20 18:31:25 christos Exp $        */

/*
 * Copyright (c) 2010, Oracle America, Inc.
 *
 * 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 the "Oracle America, 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. 
 */

/* #ident       "@(#)clnt_simple.c      1.17    94/04/24 SMI" */

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)clnt_simple.c 1.49 89/01/31 Copyr 1984 Sun Micro";
#else
__RCSID("$NetBSD: clnt_simple.c,v 1.33 2015/01/20 18:31:25 christos Exp $");
#endif
#endif

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

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

#ifdef __weak_alias
__weak_alias(rpc_call,_rpc_call)
#endif

#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;

#ifdef _REENTRANT
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 thread_key_t rpc_call_key;
static once_t rpc_call_once = ONCE_INITIALIZER;

static void
rpc_call_setup(void)
{

        thr_keycreate(&rpc_call_key, rpc_call_destroy);
}
#endif


/*
 * 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,           /* host name */
        rpcprog_t       prognum,        /* program number */
        rpcvers_t       versnum,        /* version number */
        rpcproc_t       procnum,        /* procedure number */
        xdrproc_t       inproc,         /* in XDR procedures */
        const char *    in,             /* recv data */
        xdrproc_t       outproc,        /* out XDR procedures */
        char *          out,            /* send data */
        const char *    nettype)        /* nettype */
{
        struct rpc_call_private *rcp = (struct rpc_call_private *) 0;
        enum clnt_stat clnt_stat;
        struct timeval timeout, tottimeout;

        _DIAGASSERT(host != NULL);
        /* XXX: in may be NULL ??? */
        /* XXX: out may be NULL ??? */
        /* XXX: nettype may be NULL ??? */

#ifdef _REENTRANT
        if (__isthreaded) {
                thr_once(&rpc_call_once, rpc_call_setup);
                rcp = thr_getspecific(rpc_call_key);
        } else
#endif
                rcp = rpc_call_private_main;
        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);
                }
#ifdef _REENTRANT
                if (__isthreaded)
                        thr_setspecific(rpc_call_key, (void *) rcp);
                else
#endif
                        rpc_call_private_main = 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))
                        (void)fcntl(fd, F_SETFD, FD_CLOEXEC);
                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, in,
            outproc, out, tottimeout);
        /*
         * if call failed, empty cache
         */
        if (clnt_stat != RPC_SUCCESS)
                rcp->valid = 0;
        return (clnt_stat);
}