xref: /src/lib/libc/rpc/clnt_simple.c

/*	$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);
}