/*
 * 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.
 */

#include <config.h>
#include <sys/cdefs.h>

/*
 * clnt_simple.c
 * Simplified front end to client rpc.
 */
#include <pthread.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 <rpc/clnt.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 */
    AUTH *auth;
    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 *);

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);
        mem_free(rcp, 0);
    }
}

/*
 * 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 procedure */
         const char *in,
         xdrproc_t outproc,  /* out XDR procedure */
         char  *out,      /* recv/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;
    extern thread_key_t rpc_call_key;
    extern mutex_t tsd_lock;

    if (rpc_call_key == -1) {
        mutex_lock(&tsd_lock);
        if (rpc_call_key == -1)
            thr_keycreate(&rpc_call_key, rpc_call_destroy);
        mutex_unlock(&tsd_lock);
    }
    rcp = (struct rpc_call_private *)thr_getspecific(rpc_call_key);
    if (rcp == NULL) {
        rcp = mem_alloc(sizeof(*rcp));
        if (rcp == NULL) {
            rpc_createerr.cf_stat = RPC_SYSTEMERROR;
            rpc_createerr.cf_error.re_errno = errno;
            return (rpc_createerr.cf_stat);
        }
        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_ncreate(host, prognum, versnum, nettype);
        rcp->pid = getpid();
        if (rcp->client == NULL) {
            return (rpc_createerr.cf_stat);
        }

        /* Create null auth handle--idempotent */
        rcp->auth = authnone_create();

        /*
         * 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, rcp->auth, procnum, inproc, (char *) in,
                          outproc, out, tottimeout);
    /*
     * if call failed, empty cache
     */
    if (clnt_stat != RPC_SUCCESS)
        rcp->valid = 0;
    return (clnt_stat);
}