/* Copyright (C) 1996-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Thorsten Kukuk <kukuk@suse.de>, 1996.

   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 <nss.h>

#include <netdb.h>

#include <ctype.h>

#include <errno.h>

#include <string.h>

#include <libc-lock.h>

#include <rpcsvc/yp.h>

#include <rpcsvc/ypclnt.h>

#include "nss-nis.h"

/* Get the declaration of the parser function.  */

#define ENTNAME protoent

#define EXTERN_PARSER

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

__libc_lock_define_initialized (static, lock)

struct response

{

  struct response *next;

  char val[0];

};

static struct response *start;

static struct response *next;

static int

saveit (int instatus, char *inkey, int inkeylen, char *inval,

        int invallen, char *indata)

{

  if (instatus != YP_TRUE)

    return 1;

  if (inkey && inkeylen > 0 && inval && invallen > 0)

    {

      struct response *newp = malloc (sizeof (struct response) + invallen + 1);

      if (newp == NULL)

	return 1; /* We have no error code for out of memory */

      if (start == NULL)

	start = newp;

      else

	next->next = newp;

      next = newp;

      newp->next = NULL;

      *((char *) mempcpy (newp->val, inval, invallen)) = '\0';

    }

  return 0;

}

static void

internal_nis_endprotoent (void)

{

  while (start != NULL)

    {

      next = start;

      start = start->next;

      free (next);

    }

}

static enum nss_status

internal_nis_setprotoent (void)

{

  char *domainname;

  struct ypall_callback ypcb;

  enum nss_status status;

  yp_get_default_domain (&domainname);

  internal_nis_endprotoent ();

  ypcb.foreach = saveit;

  ypcb.data = NULL;

  status = yperr2nss (yp_all (domainname, "protocols.bynumber", &ypcb));

  next = start;

  return status;

}

enum nss_status

_nss_nis_setprotoent (int stayopen)

{

  enum nss_status status;

  __libc_lock_lock (lock);

  status = internal_nis_setprotoent ();

  __libc_lock_unlock (lock);

  return status;

}

enum nss_status

_nss_nis_endprotoent (void)

{

  __libc_lock_lock (lock);

  internal_nis_endprotoent ();

  next = NULL;

  __libc_lock_unlock (lock);

  return NSS_STATUS_SUCCESS;

}

static enum nss_status

internal_nis_getprotoent_r (struct protoent *proto,

			    char *buffer, size_t buflen, int *errnop)

{

  struct parser_data *data = (void *) buffer;

  int parse_res;

  if (start == NULL)

    internal_nis_setprotoent ();

  /* Get the next entry until we found a correct one. */

  do

    {

      char *p;

      if (next == NULL)

	return NSS_STATUS_NOTFOUND;

      p = strncpy (buffer, next->val, buflen);

      while (isspace (*p))

        ++p;

      parse_res = _nss_files_parse_protoent (p, proto, data, buflen, errnop);

      if (parse_res == -1)

        return NSS_STATUS_TRYAGAIN;

      next = next->next;

    }

  while (!parse_res);

  return NSS_STATUS_SUCCESS;

}

enum nss_status

_nss_nis_getprotoent_r (struct protoent *proto, char *buffer, size_t buflen,

			int *errnop)

{

  enum nss_status status;

  __libc_lock_lock (lock);

  status = internal_nis_getprotoent_r (proto, buffer, buflen, errnop);

  __libc_lock_unlock (lock);

  return status;

}

enum nss_status

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

			   char *buffer, size_t buflen, int *errnop)

{

  if (name == NULL)

    {

      *errnop = EINVAL;

      return NSS_STATUS_UNAVAIL;

    }

  char *domain;

  if (__glibc_unlikely (yp_get_default_domain (&domain)))

    return NSS_STATUS_UNAVAIL;

  char *result;

  int len;

  int yperr = yp_match (domain, "protocols.byname", name, strlen (name),

			&result, &len;;

  if (__glibc_unlikely (yperr != YPERR_SUCCESS))

    {

      enum nss_status retval = yperr2nss (yperr);

      if (retval == NSS_STATUS_TRYAGAIN)

	*errnop = errno;

      return retval;

    }

  if (__glibc_unlikely ((size_t) (len + 1) > buflen))

    {

      free (result);

      *errnop = ERANGE;

      return NSS_STATUS_TRYAGAIN;

    }

  char *p = strncpy (buffer, result, len);

  buffer[len] = '\0';

  while (isspace (*p))

    ++p;

  free (result);

  int parse_res = _nss_files_parse_protoent (p, proto, (void *) buffer, buflen,

					     errnop);

  if (__glibc_unlikely (parse_res < 1))

    {

      if (parse_res == -1)

	return NSS_STATUS_TRYAGAIN;

      else

	return NSS_STATUS_NOTFOUND;

    }

  return NSS_STATUS_SUCCESS;

}

enum nss_status

_nss_nis_getprotobynumber_r (int number, struct protoent *proto,

			     char *buffer, size_t buflen, int *errnop)

{

  char *domain;

  if (__glibc_unlikely (yp_get_default_domain (&domain)))

    return NSS_STATUS_UNAVAIL;

  char buf[32];

  int nlen = snprintf (buf, sizeof (buf), "%d", number);

  char *result;

  int len;

  int yperr = yp_match (domain, "protocols.bynumber", buf, nlen, &result,

			&len;;

  if (__glibc_unlikely (yperr != YPERR_SUCCESS))

    {

      enum nss_status retval = yperr2nss (yperr);

      if (retval == NSS_STATUS_TRYAGAIN)

	*errnop = errno;

      return retval;

    }

  if (__glibc_unlikely ((size_t) (len + 1) > buflen))

    {

      free (result);

      *errnop = ERANGE;

      return NSS_STATUS_TRYAGAIN;

    }

  char *p = strncpy (buffer, result, len);

  buffer[len] = '\0';

  while (isspace (*p))

    ++p;

  free (result);

  int parse_res = _nss_files_parse_protoent (p, proto, (void *) buffer, buflen,

					     errnop);

  if (__glibc_unlikely (parse_res < 1))

    {

      if (parse_res == -1)

	return NSS_STATUS_TRYAGAIN;

      else

	return NSS_STATUS_NOTFOUND;

    }

  return NSS_STATUS_SUCCESS;

}