| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | |
| 2 | /* Copyright 1998 by the Massachusetts Institute of Technology. |
| 3 | * Copyright (C) 2004-2009 by Daniel Stenberg |
| 4 | * |
| 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. |
| 16 | */ |
| 17 | |
| 18 | #include "ares_setup.h" |
| 19 | |
| 20 | #include "ares.h" |
| 21 | #include "ares_library_init.h" |
| 22 | #include "ares_private.h" |
| 23 | |
| 24 | /* library-private global and unique instance vars */ |
| 25 | |
| 26 | #ifdef USE_WINSOCK |
| 27 | fpGetNetworkParams_t ares_fpGetNetworkParams = ZERO_NULL; |
| 28 | fpSystemFunction036_t ares_fpSystemFunction036 = ZERO_NULL; |
| 29 | fpGetAdaptersAddresses_t ares_fpGetAdaptersAddresses = ZERO_NULL; |
| 30 | #endif |
| 31 | |
| 32 | /* library-private global vars with source visibility restricted to this file */ |
| 33 | |
| 34 | static unsigned int ares_initialized; |
| 35 | static int ares_init_flags; |
| 36 | |
| 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; |
| 41 | |
| 42 | #ifdef USE_WINSOCK |
| 43 | static HMODULE hnd_iphlpapi; |
| 44 | static HMODULE hnd_advapi32; |
| 45 | #endif |
| 46 | |
| 47 | |
| 48 | static int ares_win32_init(void) |
| 49 | { |
| 50 | #ifdef USE_WINSOCK |
| 51 | |
| 52 | hnd_iphlpapi = 0; |
| 53 | hnd_iphlpapi = LoadLibraryW(L"iphlpapi.dll"); |
| 54 | if (!hnd_iphlpapi) |
| 55 | return ARES_ELOADIPHLPAPI; |
| 56 | |
| 57 | ares_fpGetNetworkParams = (fpGetNetworkParams_t) |
| 58 | GetProcAddress(hnd_iphlpapi, "GetNetworkParams"); |
| 59 | if (!ares_fpGetNetworkParams) |
| 60 | { |
| 61 | FreeLibrary(hnd_iphlpapi); |
| 62 | return ARES_EADDRGETNETWORKPARAMS; |
| 63 | } |
| 64 | |
| 65 | ares_fpGetAdaptersAddresses = (fpGetAdaptersAddresses_t) |
| 66 | GetProcAddress(hnd_iphlpapi, "GetAdaptersAddresses"); |
| 67 | if (!ares_fpGetAdaptersAddresses) |
| 68 | { |
| 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 */ |
| 72 | } |
| 73 | |
| 74 | /* |
| 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. |
| 78 | */ |
| 79 | |
| 80 | hnd_advapi32 = 0; |
| 81 | hnd_advapi32 = LoadLibraryW(L"advapi32.dll"); |
| 82 | if (hnd_advapi32) |
| 83 | { |
| 84 | ares_fpSystemFunction036 = (fpSystemFunction036_t) |
| 85 | GetProcAddress(hnd_advapi32, "SystemFunction036"); |
| 86 | } |
| 87 | |
| 88 | #endif |
| 89 | return ARES_SUCCESS; |
| 90 | } |
| 91 | |
| 92 | |
| 93 | static void ares_win32_cleanup(void) |
| 94 | { |
| 95 | #ifdef USE_WINSOCK |
| 96 | if (hnd_advapi32) |
| 97 | FreeLibrary(hnd_advapi32); |
| 98 | if (hnd_iphlpapi) |
| 99 | FreeLibrary(hnd_iphlpapi); |
| 100 | #endif |
| 101 | } |
| 102 | |
| 103 | |
| 104 | int ares_library_init(int flags) |
| 105 | { |
| 106 | int res; |
| 107 | |
| 108 | if (ares_initialized) |
| 109 | { |
| 110 | ares_initialized++; |
| 111 | return ARES_SUCCESS; |
| 112 | } |
| 113 | ares_initialized++; |
| 114 | |
| 115 | if (flags & ARES_LIB_INIT_WIN32) |
| 116 | { |
| 117 | res = ares_win32_init(); |
| 118 | if (res != ARES_SUCCESS) |
| 119 | return res; /* LCOV_EXCL_LINE: can't test Win32 init failure */ |
| 120 | } |
| 121 | |
| 122 | ares_init_flags = flags; |
| 123 | |
| 124 | return ARES_SUCCESS; |
| 125 | } |
| 126 | |
| 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)) |
| 131 | { |
| 132 | if (amalloc) |
| 133 | ares_malloc = amalloc; |
| 134 | if (arealloc) |
| 135 | ares_realloc = arealloc; |
| 136 | if (afree) |
| 137 | ares_free = afree; |
| 138 | return ares_library_init(flags); |
| 139 | } |
| 140 | |
| 141 | |
| 142 | void ares_library_cleanup(void) |
| 143 | { |
| 144 | if (!ares_initialized) |
| 145 | return; |
| 146 | ares_initialized--; |
| 147 | if (ares_initialized) |
| 148 | return; |
| 149 | |
| 150 | if (ares_init_flags & ARES_LIB_INIT_WIN32) |
| 151 | ares_win32_cleanup(); |
| 152 | |
| 153 | ares_init_flags = ARES_LIB_INIT_NONE; |
| 154 | ares_malloc = malloc; |
| 155 | ares_realloc = realloc; |
| 156 | ares_free = free; |
| 157 | } |
| 158 | |
| 159 | |
| 160 | int ares_library_initialized(void) |
| 161 | { |
| 162 | #ifdef USE_WINSOCK |
| 163 | if (!ares_initialized) |
| 164 | return ARES_ENOTINITIALIZED; |
| 165 | #endif |
| 166 | return ARES_SUCCESS; |
| 167 | } |