/*
 * 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);
}