/*

 * 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 <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 */

	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);

		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(host, prognum, versnum, procnum, inproc, in, outproc, out, nettype)

	const char *host;			/* host name */

	rpcprog_t prognum;			/* program number */

	rpcvers_t versnum;			/* version number */

	rpcproc_t procnum;			/* procedure number */

	xdrproc_t inproc, outproc;	/* in/out XDR procedures */

	const char *in;

	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 == KEY_INITIALIZER) {

		mutex_lock(&tsd_lock);

		if (rpc_call_key == KEY_INITIALIZER)

			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 = malloc(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_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);

}