/*      $NetBSD: getservbyport_r.c,v 1.9 2012/03/13 21:13:41 christos Exp $     */

/*
 * Copyright (c) 1983, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)getservbyport.c     8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: getservbyport_r.c,v 1.9 2012/03/13 21:13:41 christos Exp $");
#endif
#endif /* LIBC_SCCS and not lint */

#include <netdb.h>
#include <string.h>
#include <stdlib.h>

#include "servent.h"

#ifdef __weak_alias
__weak_alias(getservbyport_r,_getservbyport_r)
#endif

static struct servent *
_servent_getbyport(struct servent_data *sd, struct servent *sp, int port,
    const char *proto)
{

        if ((sd->flags & (_SV_CDB | _SV_PLAINFILE)) == 0)
                return NULL;

#if 0
        if (sd->flags & _SV_CDB) {
                uint8_t buf[255 + 4];
                size_t protolen;
                const uint8_t *data;
                const void *data_ptr;
                size_t datalen;

                port = ntohs(port);

                if (proto != NULL) {
                        protolen = strlen(proto);
                        if (protolen == 0 || protolen > 255)
                                return NULL;
                } else
                        protolen = 0;
                if (port < 0 || port > 65536)
                        return NULL;

                buf[0] = 0;
                buf[1] = (uint8_t)protolen;
                be16enc(buf + 2, port);
                memcpy(buf + 4, proto, protolen);

                if (cdbr_find(sd->cdb, buf, 4 + protolen,
                    &data_ptr, &datalen))
                        return NULL;

                if (datalen < protolen + 4)
                        return NULL;

                data = data_ptr;
                if (be16dec(data) != port)
                        return NULL;
                if (protolen) {
                        if (data[2] != protolen)
                                return NULL;
                        if (memcmp(data + 3, proto, protolen + 1))
                                return NULL;
                }
                return _servent_parsedb(sd, sp, data, datalen);
        } else
#endif
        {
                while (_servent_getline(sd) != -1) {
                        if (_servent_parseline(sd, sp) == NULL)
                                continue;
                        if (sp->s_port != port)
                                continue;
                        if (proto == NULL || strcmp(sp->s_proto, proto) == 0)
                                return sp;
                }
                return NULL;
        }
}

struct servent *
getservbyport_r(int port, const char *proto, struct servent *sp,
    struct servent_data *sd)
{
        setservent_r(sd->flags & _SV_STAYOPEN, sd);
        sp = _servent_getbyport(sd, sp, port, proto);
        if (!(sd->flags & _SV_STAYOPEN))
                _servent_close(sd);
        return sp;
}