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133 lines
2.9 KiB
133 lines
2.9 KiB
/* $Id$ */ |
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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 fpGetNetworkParams = ZERO_NULL; |
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fpSystemFunction036_t 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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fpGetNetworkParams = (fpGetNetworkParams_t) |
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GetProcAddress(hnd_iphlpapi, "GetNetworkParams"); |
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if (!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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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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