libnsl/rpc/clnt_simple.c

	clnt_simple.c revision cb6207858a9fcc2feaee22e626912fba281ac969
/*
 * 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.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*
 * 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] == NULL))
        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);
}