| 1 | /*
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| 2 | * Copyright 2004-2019 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #if (defined(_WIN64) || defined(_WIN32_WCE)) && !defined(UNICODE)
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| 11 | # define UNICODE
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| 12 | #endif
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| 13 | #if defined(UNICODE) && !defined(_UNICODE)
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| 14 | # define _UNICODE
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| 15 | #endif
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| 16 | #if defined(_UNICODE) && !defined(UNICODE)
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| 17 | # define UNICODE
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| 18 | #endif
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| 19 |
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| 20 | #include <windows.h>
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| 21 | #include <tchar.h>
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| 22 | #include <stdio.h>
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| 23 | #include "uplink.h"
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| 24 | void OPENSSL_showfatal(const char *, ...);
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| 25 |
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| 26 | static TCHAR msg[128];
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| 27 |
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| 28 | static void unimplemented(void)
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| 29 | {
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| 30 | OPENSSL_showfatal(sizeof(TCHAR) == sizeof(char) ? "%s\n" : "%S\n", msg);
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| 31 | TerminateProcess(GetCurrentProcess(), 1);
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| 32 | }
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| 33 |
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| 34 | void OPENSSL_Uplink(volatile void **table, int index)
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| 35 | {
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| 36 | static HMODULE volatile apphandle = NULL;
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| 37 | static void **volatile applinktable = NULL;
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| 38 | int len;
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| 39 | void (*func) (void) = unimplemented;
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| 40 | HANDLE h;
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| 41 | void **p;
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| 42 |
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| 43 | /*
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| 44 | * Note that the below code is not MT-safe in respect to msg buffer, but
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| 45 | * what's the worst thing that can happen? Error message might be
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| 46 | * misleading or corrupted. As error condition is fatal and should never
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| 47 | * be risen, I accept the risk...
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| 48 | */
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| 49 | /*
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| 50 | * One can argue that I should have used InterlockedExchangePointer or
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| 51 | * something to update static variables and table[]. Well, store
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| 52 | * instructions are as atomic as they can get and assigned values are
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| 53 | * effectively constant... So that volatile qualifier should be
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| 54 | * sufficient [it prohibits compiler to reorder memory access
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| 55 | * instructions].
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| 56 | */
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| 57 | do {
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| 58 | len = _sntprintf(msg, sizeof(msg) / sizeof(TCHAR),
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| 59 | _T("OPENSSL_Uplink(%p,%02X): "), table, index);
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| 60 | _tcscpy(msg + len, _T("unimplemented function"));
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| 61 |
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| 62 | if ((h = apphandle) == NULL) {
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| 63 | if ((h = GetModuleHandle(NULL)) == NULL) {
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| 64 | apphandle = (HMODULE) - 1;
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| 65 | _tcscpy(msg + len, _T("no host application"));
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| 66 | break;
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| 67 | }
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| 68 | apphandle = h;
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| 69 | }
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| 70 | if ((h = apphandle) == (HMODULE) - 1) /* revalidate */
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| 71 | break;
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| 72 |
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| 73 | if (applinktable == NULL) {
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| 74 | void **(*applink) ();
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| 75 |
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| 76 | applink = (void **(*)())GetProcAddress(h, "OPENSSL_Applink");
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| 77 | if (applink == NULL) {
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| 78 | apphandle = (HMODULE) - 1;
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| 79 | _tcscpy(msg + len, _T("no OPENSSL_Applink"));
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| 80 | break;
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| 81 | }
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| 82 | p = (*applink) ();
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| 83 | if (p == NULL) {
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| 84 | apphandle = (HMODULE) - 1;
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| 85 | _tcscpy(msg + len, _T("no ApplinkTable"));
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| 86 | break;
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| 87 | }
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| 88 | applinktable = p;
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| 89 | } else
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| 90 | p = applinktable;
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| 91 |
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| 92 | if (index > (int)p[0])
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| 93 | break;
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| 94 |
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| 95 | if (p[index])
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| 96 | func = p[index];
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| 97 | } while (0);
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| 98 |
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| 99 | table[index] = func;
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| 100 | }
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| 101 |
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| 102 | #if defined(_MSC_VER) && defined(_M_IX86)
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| 103 | # define LAZY(i) \
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| 104 | __declspec(naked) static void lazy##i (void) { \
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| 105 | _asm push i \
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| 106 | _asm push OFFSET OPENSSL_UplinkTable \
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| 107 | _asm call OPENSSL_Uplink \
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| 108 | _asm add esp,8 \
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| 109 | _asm jmp OPENSSL_UplinkTable+4*i }
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| 110 |
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| 111 | # if APPLINK_MAX>25
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| 112 | # error "Add more stubs..."
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| 113 | # endif
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| 114 | /* make some in advance... */
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| 115 | LAZY(1) LAZY(2) LAZY(3) LAZY(4) LAZY(5)
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| 116 | LAZY(6) LAZY(7) LAZY(8) LAZY(9) LAZY(10)
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| 117 | LAZY(11) LAZY(12) LAZY(13) LAZY(14) LAZY(15)
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| 118 | LAZY(16) LAZY(17) LAZY(18) LAZY(19) LAZY(20)
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| 119 | LAZY(21) LAZY(22) LAZY(23) LAZY(24) LAZY(25)
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| 120 | void *OPENSSL_UplinkTable[] = {
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| 121 | (void *)APPLINK_MAX,
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| 122 | lazy1, lazy2, lazy3, lazy4, lazy5,
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| 123 | lazy6, lazy7, lazy8, lazy9, lazy10,
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| 124 | lazy11, lazy12, lazy13, lazy14, lazy15,
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| 125 | lazy16, lazy17, lazy18, lazy19, lazy20,
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| 126 | lazy21, lazy22, lazy23, lazy24, lazy25,
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| 127 | };
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| 128 | #endif
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| 129 |
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| 130 | #ifdef SELFTEST
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| 131 | main()
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| 132 | {
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| 133 | UP_fprintf(UP_stdout, "hello, world!\n");
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| 134 | }
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| 135 | #endif
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