1 /* 2 * Copyright 2004-2021 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 #if (defined(_WIN64) || defined(_WIN32_WCE)) && !defined(UNICODE) 11 # define UNICODE 12 #endif 13 #if defined(UNICODE) && !defined(_UNICODE) 14 # define _UNICODE 15 #endif 16 #if defined(_UNICODE) && !defined(UNICODE) 17 # define UNICODE 18 #endif 19 20 #include <windows.h> 21 #include <tchar.h> 22 #include <stdio.h> 23 #include "uplink.h" 24 void OPENSSL_showfatal(const char *, ...); 25 26 static TCHAR msg[128]; 27 28 static void unimplemented(void) 29 { 30 OPENSSL_showfatal(sizeof(TCHAR) == sizeof(char) ? "%s\n" : "%S\n", msg); 31 TerminateProcess(GetCurrentProcess(), 1); 32 } 33 34 void OPENSSL_Uplink(volatile void **table, int index) 35 { 36 static HMODULE volatile apphandle = NULL; 37 static void **volatile applinktable = NULL; 38 int len; 39 void (*func) (void) = unimplemented; 40 HANDLE h; 41 void **p; 42 43 /* 44 * Note that the below code is not MT-safe in respect to msg buffer, but 45 * what's the worst thing that can happen? Error message might be 46 * misleading or corrupted. As error condition is fatal and should never 47 * be risen, I accept the risk... 48 */ 49 /* 50 * One can argue that I should have used InterlockedExchangePointer or 51 * something to update static variables and table[]. Well, store 52 * instructions are as atomic as they can get and assigned values are 53 * effectively constant... So that volatile qualifier should be 54 * sufficient [it prohibits compiler to reorder memory access 55 * instructions]. 56 */ 57 do { 58 len = _sntprintf(msg, sizeof(msg) / sizeof(TCHAR), 59 _T("OPENSSL_Uplink(%p,%02X): "), table, index); 60 _tcscpy(msg + len, _T("unimplemented function")); 61 62 if ((h = apphandle) == NULL) { 63 if ((h = GetModuleHandle(NULL)) == NULL) { 64 apphandle = (HMODULE) - 1; 65 _tcscpy(msg + len, _T("no host application")); 66 break; 67 } 68 apphandle = h; 69 } 70 if ((h = apphandle) == (HMODULE) - 1) /* revalidate */ 71 break; 72 73 if (applinktable == NULL) { 74 void **(*applink) (); 75 76 applink = (void **(*)())GetProcAddress(h, "OPENSSL_Applink"); 77 if (applink == NULL) { 78 apphandle = (HMODULE) - 1; 79 _tcscpy(msg + len, _T("no OPENSSL_Applink")); 80 break; 81 } 82 p = (*applink) (); 83 if (p == NULL) { 84 apphandle = (HMODULE) - 1; 85 _tcscpy(msg + len, _T("no ApplinkTable")); 86 break; 87 } 88 applinktable = p; 89 } else 90 p = applinktable; 91 92 if (index > (int)p[0]) 93 break; 94 95 if (p[index]) 96 func = p[index]; 97 } while (0); 98 99 table[index] = func; 100 } 101 102 #if (defined(_MSC_VER) || defined(__BORLANDC__)) && defined(_M_IX86) 103 # if defined(_MSC_VER) 104 # define LAZY(i) \ 105 __declspec(naked) static void lazy##i (void) { \ 106 _asm push i \ 107 _asm push OFFSET OPENSSL_UplinkTable \ 108 _asm call OPENSSL_Uplink \ 109 _asm add esp,8 \ 110 _asm jmp OPENSSL_UplinkTable+4*i } 111 # elif defined(__BORLANDC__) && defined(__clang__) 112 void *OPENSSL_UplinkTable[26]; /* C++Builder requires declaration before use */ 113 # define LAZY(i) \ 114 __declspec(naked) static void lazy##i (void) { \ 115 __asm__("pushl $" #i "; " \ 116 "pushl %0; " \ 117 "call %P1; " \ 118 "addl $8, %%esp; " \ 119 "jmp *%2 " \ 120 : /* no outputs */ \ 121 : "i" (OPENSSL_UplinkTable), \ 122 "i" (OPENSSL_Uplink), \ 123 "m" (OPENSSL_UplinkTable[i])); } 124 # endif 125 126 # if APPLINK_MAX>25 127 # error "Add more stubs..." 128 # endif 129 /* make some in advance... */ 130 LAZY(1) LAZY(2) LAZY(3) LAZY(4) LAZY(5) 131 LAZY(6) LAZY(7) LAZY(8) LAZY(9) LAZY(10) 132 LAZY(11) LAZY(12) LAZY(13) LAZY(14) LAZY(15) 133 LAZY(16) LAZY(17) LAZY(18) LAZY(19) LAZY(20) 134 LAZY(21) LAZY(22) LAZY(23) LAZY(24) LAZY(25) 135 void *OPENSSL_UplinkTable[] = { 136 (void *)APPLINK_MAX, 137 lazy1, lazy2, lazy3, lazy4, lazy5, 138 lazy6, lazy7, lazy8, lazy9, lazy10, 139 lazy11, lazy12, lazy13, lazy14, lazy15, 140 lazy16, lazy17, lazy18, lazy19, lazy20, 141 lazy21, lazy22, lazy23, lazy24, lazy25, 142 }; 143 #endif 144 145 #ifdef SELFTEST 146 main() 147 { 148 UP_fprintf(UP_stdout, "hello, world!\n"); 149 } 150 #endif 151