nis/common/getrpcent.c

/*
 * 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 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 *  nis/getrpcent.c -- "nis" backend for nsswitch "rpc" database
 */

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

#include "nis_common.h"
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <synch.h>
#include <rpc/rpcent.h>
#include <rpcsvc/ypclnt.h>
#include <thread.h>

static int
check_name(args)
    nss_XbyY_args_t     *args;
{
    struct rpcent       *rpc    = (struct rpcent *)args->returnval;
    const char      *name   = args->key.name;
    char            **aliasp;

    if (rpc) {
        if (strcmp(rpc->r_name, name) == 0) {
            return (1);
        }
        for (aliasp = rpc->r_aliases;  *aliasp != 0;  aliasp++) {
            if (strcmp(*aliasp, name) == 0) {
                return (1);
            }
        }
        return (0);
    } else {
        /*
         *  NSS2: nscd is running.
         */
        return (_nss_nis_check_name_aliases(args,
                    (const char *)args->buf.buffer,
                    strlen(args->buf.buffer)));

    }
}

static mutex_t  no_byname_lock  = DEFAULTMUTEX;
static int  no_byname_map   = 0;

static nss_status_t
getbyname(be, a)
    nis_backend_ptr_t   be;
    void            *a;
{
    nss_XbyY_args_t     *argp = (nss_XbyY_args_t *)a;
    int         no_map;
    sigset_t        oldmask, newmask;

    (void) sigfillset(&newmask);
    (void) thr_sigsetmask(SIG_SETMASK, &newmask, &oldmask);
    (void) mutex_lock(&no_byname_lock);
    no_map = no_byname_map;
    (void) mutex_unlock(&no_byname_lock);
    (void) thr_sigsetmask(SIG_SETMASK, &oldmask, (sigset_t *)NULL);

    if (no_map == 0) {
        int     yp_status;
        nss_status_t    res;

        res = _nss_nis_lookup(be, argp, 1, "rpc.byname",
                    argp->key.name, &yp_status);
        if (yp_status == YPERR_MAP) {
            (void) sigfillset(&newmask);
            (void) thr_sigsetmask(SIG_SETMASK, &newmask, &oldmask);
            (void) mutex_lock(&no_byname_lock);
            no_byname_map = 1;
            (void) mutex_unlock(&no_byname_lock);
            (void) thr_sigsetmask(SIG_SETMASK, &oldmask,
                    (sigset_t *)NULL);
        } else /* if (res == NSS_SUCCESS) <==== */ {
            return (res);
        }
    }

    return (_nss_nis_XY_all(be, argp, 1, argp->key.name, check_name));
}

static nss_status_t
getbynumber(be, a)
    nis_backend_ptr_t   be;
    void            *a;
{
    nss_XbyY_args_t     *argp = (nss_XbyY_args_t *)a;
    char            numstr[12];

    (void) sprintf(numstr, "%d", argp->key.number);
    return (_nss_nis_lookup(be, argp, 1, "rpc.bynumber", numstr, 0));
}

static nis_backend_op_t rpc_ops[] = {
    _nss_nis_destr,
    _nss_nis_endent,
    _nss_nis_setent,
    _nss_nis_getent_netdb,
    getbyname,
    getbynumber
};

/*ARGSUSED*/
nss_backend_t *
_nss_nis_rpc_constr(dummy1, dummy2, dummy3)
    const char  *dummy1, *dummy2, *dummy3;
{
    return (_nss_nis_constr(rpc_ops,
                sizeof (rpc_ops) / sizeof (rpc_ops[0]),
                "rpc.bynumber"));
}