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132 lines
3.0 KiB
132 lines
3.0 KiB
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/* Copyright 1998 by the Massachusetts Institute of Technology.
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* Copyright (C) 2004-2009 by Daniel Stenberg
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*
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* Permission to use, copy, modify, and distribute this
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* software and its documentation for any purpose and without
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* fee is hereby granted, provided that the above copyright
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* notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting
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* documentation, and that the name of M.I.T. not be used in
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* advertising or publicity pertaining to distribution of the
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* software without specific, written prior permission.
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* M.I.T. makes no representations about the suitability of
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* this software for any purpose. It is provided "as is"
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* without express or implied warranty.
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*/
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#include "ares_setup.h"
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#include "ares.h"
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#include "ares_library_init.h"
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#include "ares_private.h"
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/* library-private global and unique instance vars */
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#ifdef USE_WINSOCK
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fpGetNetworkParams_t ares_fpGetNetworkParams = ZERO_NULL;
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fpSystemFunction036_t ares_fpSystemFunction036 = ZERO_NULL;
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#endif
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/* library-private global vars with source visibility restricted to this file */
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static unsigned int ares_initialized;
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static int ares_init_flags;
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#ifdef USE_WINSOCK
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static HMODULE hnd_iphlpapi;
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static HMODULE hnd_advapi32;
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#endif
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static int ares_win32_init(void)
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{
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#ifdef USE_WINSOCK
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hnd_iphlpapi = 0;
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hnd_iphlpapi = LoadLibrary("iphlpapi.dll");
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if (!hnd_iphlpapi)
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return ARES_ELOADIPHLPAPI;
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ares_fpGetNetworkParams = (fpGetNetworkParams_t)
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GetProcAddress(hnd_iphlpapi, "GetNetworkParams");
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if (!ares_fpGetNetworkParams)
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{
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FreeLibrary(hnd_iphlpapi);
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return ARES_EADDRGETNETWORKPARAMS;
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}
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/*
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* When advapi32.dll is unavailable or advapi32.dll has no SystemFunction036,
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* also known as RtlGenRandom, which is the case for Windows versions prior
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* to WinXP then c-ares uses portable rand() function. Then don't error here.
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*/
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hnd_advapi32 = 0;
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hnd_advapi32 = LoadLibrary("advapi32.dll");
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if (hnd_advapi32)
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{
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ares_fpSystemFunction036 = (fpSystemFunction036_t)
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GetProcAddress(hnd_advapi32, "SystemFunction036");
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}
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#endif
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return ARES_SUCCESS;
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}
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static void ares_win32_cleanup(void)
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{
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#ifdef USE_WINSOCK
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if (hnd_advapi32)
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FreeLibrary(hnd_advapi32);
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if (hnd_iphlpapi)
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FreeLibrary(hnd_iphlpapi);
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#endif
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}
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int ares_library_init(int flags)
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{
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int res;
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if (ares_initialized)
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return ARES_SUCCESS;
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ares_initialized++;
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if (flags & ARES_LIB_INIT_WIN32)
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{
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res = ares_win32_init();
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if (res != ARES_SUCCESS)
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return res;
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}
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ares_init_flags = flags;
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return ARES_SUCCESS;
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}
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void ares_library_cleanup(void)
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{
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if (!ares_initialized)
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return;
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ares_initialized--;
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if (ares_init_flags & ARES_LIB_INIT_WIN32)
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ares_win32_cleanup();
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ares_init_flags = ARES_LIB_INIT_NONE;
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}
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int ares_library_initialized(void)
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{
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#ifdef USE_WINSOCK
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if (!ares_initialized)
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return ARES_ENOTINITIALIZED;
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#endif
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return ARES_SUCCESS;
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}
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