/* Copyright (C) 1997-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 1997.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <hesiod.h>

#include <netdb.h>

#include <netinet/in.h>

#include <nss.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

/* Declare a parser for Hesiod protocol entries.  Although the format

   of the entries is identical to those in /etc/protocols, here is no

   predefined parser for us to use.  */

#define ENTNAME protoent

struct protoent_data {};

#define TRAILING_LIST_MEMBER		p_aliases

#define TRAILING_LIST_SEPARATOR_P	isspace

#include <nss/nss_files/files-parse.c>

LINE_PARSER

("#",

 STRING_FIELD (result->p_name, isspace, 1);

 INT_FIELD (result->p_proto, isspace, 1, 10,);

 )

enum nss_status

_nss_hesiod_setprotoent (int stayopen)

{

  return NSS_STATUS_SUCCESS;

}

enum nss_status

_nss_hesiod_endprotoent (void)

{

  return NSS_STATUS_SUCCESS;

}

static enum nss_status

lookup (const char *name, const char *type, struct protoent *proto,

	char *buffer, size_t buflen, int *errnop)

{

  struct parser_data *data = (void *) buffer;

  size_t linebuflen;

  void *context;

  char **list, **item;

  int parse_res;

  int found;

  int olderr = errno;

  if (hesiod_init (&context) < 0)

    return NSS_STATUS_UNAVAIL;

  list = hesiod_resolve (context, name, type);

  if (list == NULL)

    {

      int err = errno;

      hesiod_end (context);

      __set_errno (olderr);

      return err == ENOENT ? NSS_STATUS_NOTFOUND : NSS_STATUS_UNAVAIL;

    }

  linebuflen = buffer + buflen - data->linebuffer;

  item = list;

  found = 0;

  do

    {

      size_t len = strlen (*item) + 1;

      if (linebuflen < len)

	{

	  hesiod_free_list (context, list);

	  hesiod_end (context);

	  *errnop = ERANGE;

	  return NSS_STATUS_TRYAGAIN;

	}

      memcpy (data->linebuffer, *item, len);

      parse_res = parse_line (buffer, proto, data, buflen, errnop);

      if (parse_res == -1)

	{

	  hesiod_free_list (context, list);

	  hesiod_end (context);

	  return NSS_STATUS_TRYAGAIN;

	}

      if (parse_res > 0)

	found = 1;

      ++item;

    }

  while (*item != NULL && !found);

  hesiod_free_list (context, list);

  hesiod_end (context);

  if (found == 0)

    {

      __set_errno (olderr);

      return NSS_STATUS_NOTFOUND;

    }

  return NSS_STATUS_SUCCESS;

}

enum nss_status

_nss_hesiod_getprotobyname_r (const char *name, struct protoent *proto,

			      char *buffer, size_t buflen, int *errnop)

{

  return lookup (name, "protocol", proto, buffer, buflen, errnop);

}

enum nss_status

_nss_hesiod_getprotobynumber_r (const int protocol, struct protoent *proto,

				char *buffer, size_t buflen, int *errnop)

{

  char protostr[21];

  snprintf (protostr, sizeof protostr, "%d", protocol);

  return lookup (protostr, "protonum", proto, buffer, buflen, errnop);

}