/*
 * 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.
 *
 * files/netmasks.c -- "files" backend for nsswitch "netmasks" database
 */

/*
 * All routines necessary to deal with the file /etc/inet/netmasks.  The file
 * contains mappings from 32 bit network internet addresses to their
 * corresponding 32 bit mask internet addresses. The addresses are in dotted
 * internet address form.
 */

#include "files_common.h"
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <nss_dbdefs.h>
#include <ctype.h>

/*
 * Validate 'files' netmasks entry. The comparison objects are in IPv4
 * internet address format.
 */
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_NETMASKS];
        struct in_addr  lineaddr, argsaddr;

        linep = line;
        limit = line + linelen;

        /* skip leading spaces */
        while (linep < limit && isspace(*linep))
                linep++;

        addrstart = linep;
        while (linep < limit && !isspace(*linep))
                linep++;
        if (linep == limit)
                return (0);
        addrlen = linep - addrstart;
        if (addrlen < sizeof (addrbuf)) {
                (void) memcpy(addrbuf, addrstart, addrlen);
                addrbuf[addrlen] = '\0';
                if ((lineaddr.s_addr = inet_addr(addrbuf)) ==
                                                (in_addr_t)0xffffffffU)
                        return (0);
                if ((argsaddr.s_addr = inet_addr(argp->key.name))
                                == (in_addr_t)0xffffffffU)
                        return (0);
                return (lineaddr.s_addr == argsaddr.s_addr);
        }
        return (0);
}

static nss_status_t
getbynet(be, a)
        files_backend_ptr_t     be;
        void                    *a;
{
        nss_XbyY_args_t         *argp = (nss_XbyY_args_t *)a;
        nss_status_t            res;
        char                    tmpbuf[NSS_LINELEN_NETMASKS];

        /*
         * use the buffer passed in if result is to be returned
         * in /etc file format
         */
        if (argp->buf.result != NULL) {
                argp->buf.buffer = tmpbuf;
                argp->buf.buflen = NSS_LINELEN_NETMASKS;
        }
        res = _nss_files_XY_all(be, argp, 1, argp->key.name, check_addr);
        if (argp->buf.result != NULL) {
                argp->buf.buffer = NULL;
                argp->buf.buflen = 0;
        } else {
                /* the frontend expects the netmask data only */
                if (res == NSS_SUCCESS)  {
                        char    *m;
                        char    *s = (char *)argp->returnval;
                        int     l = 0;

                        m = s + argp->returnlen - 1;

                        /* skip trailing spaces */
                        while (s < m && isspace(*m))
                                m--;

                        for (; s <= m; m--) {
                                if (isspace(*m))
                                        break;
                                l++;
                        }
                        m++;
                        (void) memmove(argp->returnval, m, l);
                        argp->returnlen = l;
                        *(s + l) = '\0';
                }
        }

        return (res);
}

static files_backend_op_t netmasks_ops[] = {
        _nss_files_destr,
        getbynet
};

/*ARGSUSED*/
nss_backend_t *
_nss_files_netmasks_constr(dummy1, dummy2, dummy3)
        const char      *dummy1, *dummy2, *dummy3;
{
        return (_nss_files_constr(netmasks_ops,
            sizeof (netmasks_ops) / sizeof (netmasks_ops[0]),
            _PATH_NETMASKS, NSS_LINELEN_NETMASKS, NULL));
}