/*
 * 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/bootparams_getbyname.c -- "files" backend for
 *      nsswitch "bootparams" database.
 */

static const char *bootparams = "/etc/bootparams";

#include "files_common.h"
#include <stdlib.h>
#include <ctype.h>
#include <strings.h>

static nss_status_t _nss_files_XY_bootparams(files_backend_ptr_t,
        nss_XbyY_args_t *, const char *);

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

        /* bootparams_getbyname() has not set/endent; rewind on each call */
        if ((res = _nss_files_setent(be, 0)) != NSS_SUCCESS) {
                return (res);
        }
        return (_nss_files_XY_bootparams(be, argp, argp->key.name));
}

static files_backend_op_t bootparams_ops[] = {
        _nss_files_destr,
        getbyname
};

/*ARGSUSED*/
nss_backend_t *
_nss_files_bootparams_constr(dummy1, dummy2, dummy3)
        const char      *dummy1, *dummy2, *dummy3;
{
        return (_nss_files_constr(bootparams_ops,
                sizeof (bootparams_ops) / sizeof (bootparams_ops[0]),
                bootparams,
                NSS_LINELEN_BOOTPARAMS,
                NULL));
}

/*
 * bootparams has the hostname as part of the data in the file, but the other
 * backends don't include it in the data passed to the backend.  For this
 * reason, we process everything here and don't bother calling the backend.
 */
/*ARGSUSED*/
static nss_status_t
_nss_files_XY_bootparams(be, args, filter)
        files_backend_ptr_t     be;
        nss_XbyY_args_t         *args;
        const char              *filter;
                        /*
                         * filter not useful here since the key
                         * we are looking for is the first "word"
                         * on the line and we can be fast enough.
                         */
{
        nss_status_t            res;

        if (be->buf == 0 &&
                (be->buf = (char *)malloc(be->minbuf)) == 0) {
                (void) _nss_files_endent(be, 0);
                return (NSS_UNAVAIL); /* really panic, malloc failed */
        }

        res = NSS_NOTFOUND;

        /*CONSTCOND*/
        while (1) {
                char            *instr  = be->buf;
                char            *p, *host, *limit;
                int             linelen;

                /*
                 * _nss_files_read_line does process the '\' that are used
                 * in /etc/bootparams for continuation and gives one long
                 * buffer.
                 *
                 * linelen counts the characters up to but excluding the '\n'
                 */
                if ((linelen = _nss_files_read_line(be->f, instr,
                    be->minbuf)) < 0) {
                        /* End of file */
                        args->returnval = 0;
                        args->returnlen = 0;
                        break;
                }

                /*
                 * we need to strip off the host name before returning it.
                 */
                p = instr;
                limit = p + linelen;

                /* Skip over leading whitespace */
                while (p < limit && isspace(*p)) {
                        p++;
                }
                host = p;

                /* Skip over the hostname */
                while (p < limit && !isspace(*p)) {
                        p++;
                }
                *p++ = '\0';

                if (strcasecmp(args->key.name, host) != 0) {
                        continue;
                }

                /* Skip over whitespace between name and first datum */
                while (p < limit && isspace(*p)) {
                        p++;
                }
                if (p >= limit) {
                        /* Syntax error -- no data! Just skip it. */
                        continue;
                }

                linelen -= (p - instr);
                if (args->buf.buflen <= linelen) {      /* not enough buffer */
                        args->erange = 1;
                        break;
                }
                (void) memcpy(args->buf.buffer, p, linelen);
                args->buf.buffer[linelen] = '\0';
                args->returnval = args->buf.result;
                args->returnlen = linelen;
                res = NSS_SUCCESS;
                break;
        }
        (void) _nss_files_endent(be, 0);
        return (res);
}