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
unimplemented(void)28 static void unimplemented(void)
29 {
30 OPENSSL_showfatal(sizeof(TCHAR) == sizeof(char) ? "%s\n" : "%S\n", msg);
31 TerminateProcess(GetCurrentProcess(), 1);
32 }
33
OPENSSL_Uplink(volatile void ** table,int index)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
main()146 main()
147 {
148 UP_fprintf(UP_stdout, "hello, world!\n");
149 }
150 #endif
151
