mirror of https://github.com/c-ares/c-ares.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
147 lines
3.4 KiB
147 lines
3.4 KiB
|
|
/* Copyright 1998 by the Massachusetts Institute of Technology. |
|
* Copyright (C) 2004-2009 by Daniel Stenberg |
|
* |
|
* Permission to use, copy, modify, and distribute this |
|
* software and its documentation for any purpose and without |
|
* fee is hereby granted, provided that the above copyright |
|
* notice appear in all copies and that both that copyright |
|
* notice and this permission notice appear in supporting |
|
* documentation, and that the name of M.I.T. not be used in |
|
* advertising or publicity pertaining to distribution of the |
|
* software without specific, written prior permission. |
|
* M.I.T. makes no representations about the suitability of |
|
* this software for any purpose. It is provided "as is" |
|
* without express or implied warranty. |
|
*/ |
|
|
|
#include "ares_setup.h" |
|
|
|
#include "ares.h" |
|
#include "ares_library_init.h" |
|
#include "ares_private.h" |
|
|
|
/* library-private global and unique instance vars */ |
|
|
|
#ifdef USE_WINSOCK |
|
fpGetNetworkParams_t ares_fpGetNetworkParams = ZERO_NULL; |
|
fpSystemFunction036_t ares_fpSystemFunction036 = ZERO_NULL; |
|
fpGetAdaptersAddresses_t ares_fpGetAdaptersAddresses = 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 USE_WINSOCK |
|
static HMODULE hnd_iphlpapi; |
|
static HMODULE hnd_advapi32; |
|
#endif |
|
|
|
|
|
static int ares_win32_init(void) |
|
{ |
|
#ifdef USE_WINSOCK |
|
|
|
hnd_iphlpapi = 0; |
|
hnd_iphlpapi = LoadLibrary("iphlpapi.dll"); |
|
if (!hnd_iphlpapi) |
|
return ARES_ELOADIPHLPAPI; |
|
|
|
ares_fpGetNetworkParams = (fpGetNetworkParams_t) |
|
GetProcAddress(hnd_iphlpapi, "GetNetworkParams"); |
|
if (!ares_fpGetNetworkParams) |
|
{ |
|
FreeLibrary(hnd_iphlpapi); |
|
return ARES_EADDRGETNETWORKPARAMS; |
|
} |
|
|
|
ares_fpGetAdaptersAddresses = (fpGetAdaptersAddresses_t) |
|
GetProcAddress(hnd_iphlpapi, "GetAdaptersAddresses"); |
|
if (!ares_fpGetAdaptersAddresses) |
|
{ |
|
/* This can happen on clients before WinXP, I don't |
|
think it should be an error, unless we don't want to |
|
support Windows 2000 anymore */ |
|
} |
|
|
|
/* |
|
* When advapi32.dll is unavailable or advapi32.dll has no SystemFunction036, |
|
* also known as RtlGenRandom, which is the case for Windows versions prior |
|
* to WinXP then c-ares uses portable rand() function. Then don't error here. |
|
*/ |
|
|
|
hnd_advapi32 = 0; |
|
hnd_advapi32 = LoadLibrary("advapi32.dll"); |
|
if (hnd_advapi32) |
|
{ |
|
ares_fpSystemFunction036 = (fpSystemFunction036_t) |
|
GetProcAddress(hnd_advapi32, "SystemFunction036"); |
|
} |
|
|
|
#endif |
|
return ARES_SUCCESS; |
|
} |
|
|
|
|
|
static void ares_win32_cleanup(void) |
|
{ |
|
#ifdef USE_WINSOCK |
|
if (hnd_advapi32) |
|
FreeLibrary(hnd_advapi32); |
|
if (hnd_iphlpapi) |
|
FreeLibrary(hnd_iphlpapi); |
|
#endif |
|
} |
|
|
|
|
|
int ares_library_init(int flags) |
|
{ |
|
int res; |
|
|
|
if (ares_initialized) |
|
{ |
|
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_initialized) |
|
return; |
|
|
|
if (ares_init_flags & ARES_LIB_INIT_WIN32) |
|
ares_win32_cleanup(); |
|
|
|
ares_init_flags = ARES_LIB_INIT_NONE; |
|
} |
|
|
|
|
|
int ares_library_initialized(void) |
|
{ |
|
#ifdef USE_WINSOCK |
|
if (!ares_initialized) |
|
return ARES_ENOTINITIALIZED; |
|
#endif |
|
return ARES_SUCCESS; |
|
} |
|
|
|
|
|
|