/*
 * 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 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 *
 * files/getnetent.c -- "files" backend for nsswitch "networks" database
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include "files_common.h"
#include <strings.h>
#include <ctype.h>

static nss_status_t
getbyname(be, a)
        files_backend_ptr_t     be;
        void            *a;
{
        nss_XbyY_args_t         *argp = (nss_XbyY_args_t *)a;

        return (_nss_files_XY_all(be, argp, 1, argp->key.name,
                        _nss_files_check_name_aliases));
}

static int
check_addr(nss_XbyY_args_t *argp, const char *line, int linelen)
{

        const char      *limit, *linep, *addrstart;
        int             addrlen;
        char            addrbuf[NSS_LINELEN_NETWORKS];
        in_addr_t       linenet;

        linep = line;
        limit = line + linelen;

        /* skip network name */
        while (linep < limit && !isspace(*linep))
                linep++;
        /* skip the delimiting spaces */
        while (linep < limit && isspace(*linep))
                linep++;
        if (linep == limit)
                return (0);

        addrstart = linep;
        while (linep < limit && !isspace(*linep))
                linep++;
        addrlen = linep - addrstart;
        if (addrlen < sizeof (addrbuf)) {
                (void) memcpy(addrbuf, addrstart, addrlen);
                addrbuf[addrlen] = '\0';
                if ((linenet = inet_network(addrbuf)) ==
                                                (in_addr_t)0xffffffffU)
                        return (0);
                return (AF_INET == argp->key.netaddr.type &&
                        linenet == argp->key.netaddr.net);
        }
        return (0);
}

static nss_status_t
getbyaddr(be, a)
        files_backend_ptr_t     be;
        void            *a;
{
        nss_XbyY_args_t         *argp = (nss_XbyY_args_t *)a;

        return (_nss_files_XY_all(be, argp, 1, 0, check_addr));
}

static files_backend_op_t net_ops[] = {
        _nss_files_destr,
        _nss_files_endent,
        _nss_files_setent,
        _nss_files_getent_netdb,
        getbyname,
        getbyaddr
};

/*ARGSUSED*/
nss_backend_t *
_nss_files_networks_constr(dummy1, dummy2, dummy3)
        const char  *dummy1, *dummy2, *dummy3;
{
        return (_nss_files_constr(net_ops,
                                sizeof (net_ops) / sizeof (net_ops[0]),
                                _PATH_NETWORKS,
                                NSS_LINELEN_NETWORKS,
                                NULL));
}