2 /* Copyright 1998 by the Massachusetts Institute of Technology.
3 * Copyright (C) 2004-2009 by Daniel Stenberg
5 * Permission to use, copy, modify, and distribute this
6 * software and its documentation for any purpose and without
7 * fee is hereby granted, provided that the above copyright
8 * notice appear in all copies and that both that copyright
9 * notice and this permission notice appear in supporting
10 * documentation, and that the name of M.I.T. not be used in
11 * advertising or publicity pertaining to distribution of the
12 * software without specific, written prior permission.
13 * M.I.T. makes no representations about the suitability of
14 * this software for any purpose. It is provided "as is"
15 * without express or implied warranty.
18 #include "ares_setup.h"
21 #include "ares_library_init.h"
22 #include "ares_private.h"
24 /* library-private global and unique instance vars */
27 fpGetNetworkParams_t ares_fpGetNetworkParams = ZERO_NULL;
28 fpSystemFunction036_t ares_fpSystemFunction036 = ZERO_NULL;
29 fpGetAdaptersAddresses_t ares_fpGetAdaptersAddresses = ZERO_NULL;
32 /* library-private global vars with source visibility restricted to this file */
34 static unsigned int ares_initialized;
35 static int ares_init_flags;
38 static HMODULE hnd_iphlpapi;
39 static HMODULE hnd_advapi32;
43 static int ares_win32_init(void)
48 hnd_iphlpapi = LoadLibrary("iphlpapi.dll");
50 return ARES_ELOADIPHLPAPI;
52 ares_fpGetNetworkParams = (fpGetNetworkParams_t)
53 GetProcAddress(hnd_iphlpapi, "GetNetworkParams");
54 if (!ares_fpGetNetworkParams)
56 FreeLibrary(hnd_iphlpapi);
57 return ARES_EADDRGETNETWORKPARAMS;
60 ares_fpGetAdaptersAddresses = (fpGetAdaptersAddresses_t)
61 GetProcAddress(hnd_iphlpapi, "GetAdaptersAddresses");
62 if (!ares_fpGetAdaptersAddresses)
64 /* This can happen on clients before WinXP, I don't
65 think it should be an error, unless we don't want to
66 support Windows 2000 anymore */
70 * When advapi32.dll is unavailable or advapi32.dll has no SystemFunction036,
71 * also known as RtlGenRandom, which is the case for Windows versions prior
72 * to WinXP then c-ares uses portable rand() function. Then don't error here.
76 hnd_advapi32 = LoadLibrary("advapi32.dll");
79 ares_fpSystemFunction036 = (fpSystemFunction036_t)
80 GetProcAddress(hnd_advapi32, "SystemFunction036");
88 static void ares_win32_cleanup(void)
92 FreeLibrary(hnd_advapi32);
94 FreeLibrary(hnd_iphlpapi);
99 int ares_library_init(int flags)
103 if (ares_initialized)
110 if (flags & ARES_LIB_INIT_WIN32)
112 res = ares_win32_init();
113 if (res != ARES_SUCCESS)
117 ares_init_flags = flags;
123 void ares_library_cleanup(void)
125 if (!ares_initialized)
128 if (ares_initialized)
131 if (ares_init_flags & ARES_LIB_INIT_WIN32)
132 ares_win32_cleanup();
134 ares_init_flags = ARES_LIB_INIT_NONE;
138 int ares_library_initialized(void)
141 if (!ares_initialized)
142 return ARES_ENOTINITIALIZED;