/* $Id$ */

#include "setup.h"

#include "ares.h"

#include "ares_library_init.h"

#include "ares_private.h"

/* library-private global and unique instance vars */

#ifdef WIN32

fpGetNetworkParams_t fpGetNetworkParams = ZERO_NULL;

fpSystemFunction036_t fpSystemFunction036 = ZERO_NULL;

#endif

/* library-private global vars with source visibility restricted to this file */

static unsigned int ares_initialized;

static int          ares_init_flags;

#ifdef WIN32

static HMODULE hnd_iphlpapi;

static HMODULE hnd_advapi32;

#endif

static int ares_win32_init(void)

{

#ifdef WIN32

  hnd_iphlpapi = 0;

  hnd_iphlpapi = LoadLibrary("iphlpapi.dll");

  if (!hnd_iphlpapi)

    return ARES_ELOADIPHLPAPI;

  fpGetNetworkParams = (fpGetNetworkParams_t)

    GetProcAddress(hnd_iphlpapi, "GetNetworkParams");

  if (!fpGetNetworkParams)

    {

      FreeLibrary(hnd_iphlpapi);

      return ARES_EADDRGetNetworkParams;

    }

  hnd_advapi32 = 0;

  hnd_advapi32 = LoadLibrary("advapi32.dll");

  if (!hnd_advapi32)

    {

      FreeLibrary(hnd_iphlpapi);

      return ARES_ELOADADVAPI32;

    }

  fpSystemFunction036 = (fpSystemFunction036_t)

    GetProcAddress(hnd_advapi32, "SystemFunction036");

  if (!fpSystemFunction036)

    {

      FreeLibrary(hnd_advapi32);

      FreeLibrary(hnd_iphlpapi);

      return ARES_EADDRSYSTEMFUNCTION036;

    }

#endif

  return ARES_SUCCESS;

}

static void ares_win32_cleanup(void)

{

#ifdef WIN32

  if (hnd_advapi32)

    FreeLibrary(hnd_advapi32);

  if (hnd_iphlpapi)

    FreeLibrary(hnd_iphlpapi);

#endif

}

int ares_library_init(int flags)

{

  int res;

  if (ares_initialized)

    return ARES_SUCCESS;

  ares_initialized++;

  if (flags & ARES_LIB_INIT_WIN32)

    {

      res = ares_win32_init();

      if (res != ARES_SUCCESS)

        return res;

    }

  ares_init_flags = flags;

  return ARES_SUCCESS;

}

void ares_library_cleanup(void)

{

  if (!ares_initialized)

    return;

  ares_initialized--;

  if (ares_init_flags & ARES_LIB_INIT_WIN32)

    ares_win32_cleanup();

  ares_init_flags = ARES_LIB_INIT_NONE;

}

#ifndef HEADER_CARES_LIBRARY_INIT_H

#define HEADER_CARES_LIBRARY_INIT_H

/* $Id$ */

#include "setup.h"

#ifdef WIN32

#include <iphlpapi.h>

typedef DWORD (WINAPI *fpGetNetworkParams_t) (FIXED_INFO*, DWORD*);

typedef BOOLEAN (APIENTRY *fpSystemFunction036_t) (void*, ULONG);

/* Forward-declaration of variables defined in ares_library_init.c */

/* that are global and unique instances for whole c-ares library.  */

extern fpGetNetworkParams_t fpGetNetworkParams;

extern fpSystemFunction036_t fpSystemFunction036;

#endif /* WIN32 */

#endif /* HEADER_CARES_LIBRARY_INIT_H */