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;
37 /* library-private global vars with visibility across the whole library */
38 void *(*ares_malloc)(size_t size) = malloc;
39 void *(*ares_realloc)(void *ptr, size_t size) = realloc;
40 void (*ares_free)(void *ptr) = free;
43 static HMODULE hnd_iphlpapi;
44 static HMODULE hnd_advapi32;
48 static int ares_win32_init(void)
53 hnd_iphlpapi = LoadLibraryW(L"iphlpapi.dll");
55 return ARES_ELOADIPHLPAPI;
57 ares_fpGetNetworkParams = (fpGetNetworkParams_t)
58 GetProcAddress(hnd_iphlpapi, "GetNetworkParams");
59 if (!ares_fpGetNetworkParams)
61 FreeLibrary(hnd_iphlpapi);
62 return ARES_EADDRGETNETWORKPARAMS;
65 ares_fpGetAdaptersAddresses = (fpGetAdaptersAddresses_t)
66 GetProcAddress(hnd_iphlpapi, "GetAdaptersAddresses");
67 if (!ares_fpGetAdaptersAddresses)
69 /* This can happen on clients before WinXP, I don't
70 think it should be an error, unless we don't want to
71 support Windows 2000 anymore */
75 * When advapi32.dll is unavailable or advapi32.dll has no SystemFunction036,
76 * also known as RtlGenRandom, which is the case for Windows versions prior
77 * to WinXP then c-ares uses portable rand() function. Then don't error here.
81 hnd_advapi32 = LoadLibraryW(L"advapi32.dll");
84 ares_fpSystemFunction036 = (fpSystemFunction036_t)
85 GetProcAddress(hnd_advapi32, "SystemFunction036");
93 static void ares_win32_cleanup(void)
97 FreeLibrary(hnd_advapi32);
99 FreeLibrary(hnd_iphlpapi);
104 int ares_library_init(int flags)
108 if (ares_initialized)
115 if (flags & ARES_LIB_INIT_WIN32)
117 res = ares_win32_init();
118 if (res != ARES_SUCCESS)
119 return res; /* LCOV_EXCL_LINE: can't test Win32 init failure */
122 ares_init_flags = flags;
127 int ares_library_init_mem(int flags,
128 void *(*amalloc)(size_t size),
129 void (*afree)(void *ptr),
130 void *(*arealloc)(void *ptr, size_t size))
133 ares_malloc = amalloc;
135 ares_realloc = arealloc;
138 return ares_library_init(flags);
142 void ares_library_cleanup(void)
144 if (!ares_initialized)
147 if (ares_initialized)
150 if (ares_init_flags & ARES_LIB_INIT_WIN32)
151 ares_win32_cleanup();
153 ares_init_flags = ARES_LIB_INIT_NONE;
154 ares_malloc = malloc;
155 ares_realloc = realloc;
160 int ares_library_initialized(void)
163 if (!ares_initialized)
164 return ARES_ENOTINITIALIZED;