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openssl/crypto/dso/dso_win32.c
KaoruToda 26a7d938c9 Remove parentheses of return. 
Since return is inconsistent, I removed unnecessary parentheses and
unified them.

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4541)
2017-10-18 16:05:06 +01:00

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/*
* Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include "e_os.h"
#include "dso_locl.h"
#if defined(DSO_WIN32)
# ifdef _WIN32_WCE
# if _WIN32_WCE < 300
static FARPROC GetProcAddressA(HMODULE hModule, LPCSTR lpProcName)
{
WCHAR lpProcNameW[64];
int i;
for (i = 0; lpProcName[i] && i < 64; i++)
lpProcNameW[i] = (WCHAR)lpProcName[i];
if (i == 64)
return NULL;
lpProcNameW[i] = 0;
return GetProcAddressW(hModule, lpProcNameW);
}
# endif
# undef GetProcAddress
# define GetProcAddress GetProcAddressA
static HINSTANCE LoadLibraryA(LPCSTR lpLibFileName)
{
WCHAR *fnamw;
size_t len_0 = strlen(lpLibFileName) + 1, i;
# ifdef _MSC_VER
fnamw = (WCHAR *)_alloca(len_0 * sizeof(WCHAR));
# else
fnamw = (WCHAR *)alloca(len_0 * sizeof(WCHAR));
# endif
if (fnamw == NULL) {
SetLastError(ERROR_NOT_ENOUGH_MEMORY);
return NULL;
}
# if defined(_WIN32_WCE) && _WIN32_WCE>=101
if (!MultiByteToWideChar(CP_ACP, 0, lpLibFileName, len_0, fnamw, len_0))
# endif
for (i = 0; i < len_0; i++)
fnamw[i] = (WCHAR)lpLibFileName[i];
return LoadLibraryW(fnamw);
}
# endif
/* Part of the hack in "win32_load" ... */
# define DSO_MAX_TRANSLATED_SIZE 256
static int win32_load(DSO *dso);
static int win32_unload(DSO *dso);
static DSO_FUNC_TYPE win32_bind_func(DSO *dso, const char *symname);
static char *win32_name_converter(DSO *dso, const char *filename);
static char *win32_merger(DSO *dso, const char *filespec1,
const char *filespec2);
static void *win32_globallookup(const char *name);
static const char *openssl_strnchr(const char *string, int c, size_t len);
static DSO_METHOD dso_meth_win32 = {
"OpenSSL 'win32' shared library method",
win32_load,
win32_unload,
win32_bind_func,
NULL, /* ctrl */
win32_name_converter,
win32_merger,
NULL, /* init */
NULL, /* finish */
NULL, /* pathbyaddr */
win32_globallookup
};
DSO_METHOD *DSO_METHOD_openssl(void)
{
return &dso_meth_win32;
}
/*
* For this DSO_METHOD, our meth_data STACK will contain; (i) a pointer to
* the handle (HINSTANCE) returned from LoadLibrary(), and copied.
*/
static int win32_load(DSO *dso)
{
HINSTANCE h = NULL, *p = NULL;
/* See applicable comments from dso_dl.c */
char *filename = DSO_convert_filename(dso, NULL);
if (filename == NULL) {
DSOerr(DSO_F_WIN32_LOAD, DSO_R_NO_FILENAME);
goto err;
}
h = LoadLibraryA(filename);
if (h == NULL) {
DSOerr(DSO_F_WIN32_LOAD, DSO_R_LOAD_FAILED);
ERR_add_error_data(3, "filename(", filename, ")");
goto err;
}
p = OPENSSL_malloc(sizeof(*p));
if (p == NULL) {
DSOerr(DSO_F_WIN32_LOAD, ERR_R_MALLOC_FAILURE);
goto err;
}
*p = h;
if (!sk_void_push(dso->meth_data, p)) {
DSOerr(DSO_F_WIN32_LOAD, DSO_R_STACK_ERROR);
goto err;
}
/* Success */
dso->loaded_filename = filename;
return 1;
err:
/* Cleanup ! */
OPENSSL_free(filename);
OPENSSL_free(p);
if (h != NULL)
FreeLibrary(h);
return 0;
}
static int win32_unload(DSO *dso)
{
HINSTANCE *p;
if (dso == NULL) {
DSOerr(DSO_F_WIN32_UNLOAD, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
if (sk_void_num(dso->meth_data) < 1)
return 1;
p = sk_void_pop(dso->meth_data);
if (p == NULL) {
DSOerr(DSO_F_WIN32_UNLOAD, DSO_R_NULL_HANDLE);
return 0;
}
if (!FreeLibrary(*p)) {
DSOerr(DSO_F_WIN32_UNLOAD, DSO_R_UNLOAD_FAILED);
/*
* We should push the value back onto the stack in case of a retry.
*/
sk_void_push(dso->meth_data, p);
return 0;
}
/* Cleanup */
OPENSSL_free(p);
return 1;
}
static DSO_FUNC_TYPE win32_bind_func(DSO *dso, const char *symname)
{
HINSTANCE *ptr;
union {
void *p;
FARPROC f;
} sym;
if ((dso == NULL) || (symname == NULL)) {
DSOerr(DSO_F_WIN32_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
return NULL;
}
if (sk_void_num(dso->meth_data) < 1) {
DSOerr(DSO_F_WIN32_BIND_FUNC, DSO_R_STACK_ERROR);
return NULL;
}
ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
if (ptr == NULL) {
DSOerr(DSO_F_WIN32_BIND_FUNC, DSO_R_NULL_HANDLE);
return NULL;
}
sym.f = GetProcAddress(*ptr, symname);
if (sym.p == NULL) {
DSOerr(DSO_F_WIN32_BIND_FUNC, DSO_R_SYM_FAILURE);
ERR_add_error_data(3, "symname(", symname, ")");
return NULL;
}
return (DSO_FUNC_TYPE)sym.f;
}
struct file_st {
const char *node;
int nodelen;
const char *device;
int devicelen;
const char *predir;
int predirlen;
const char *dir;
int dirlen;
const char *file;
int filelen;
};
static struct file_st *win32_splitter(DSO *dso, const char *filename,
int assume_last_is_dir)
{
struct file_st *result = NULL;
enum { IN_NODE, IN_DEVICE, IN_FILE } position;
const char *start = filename;
char last;
if (!filename) {
DSOerr(DSO_F_WIN32_SPLITTER, DSO_R_NO_FILENAME);
return NULL;
}
result = OPENSSL_zalloc(sizeof(*result));
if (result == NULL) {
DSOerr(DSO_F_WIN32_SPLITTER, ERR_R_MALLOC_FAILURE);
return NULL;
}
position = IN_DEVICE;
if ((filename[0] == '\\' && filename[1] == '\\')
|| (filename[0] == '/' && filename[1] == '/')) {
position = IN_NODE;
filename += 2;
start = filename;
result->node = start;
}
do {
last = filename[0];
switch (last) {
case ':':
if (position != IN_DEVICE) {
DSOerr(DSO_F_WIN32_SPLITTER, DSO_R_INCORRECT_FILE_SYNTAX);
OPENSSL_free(result);
return NULL;
}
result->device = start;
result->devicelen = (int)(filename - start);
position = IN_FILE;
start = ++filename;
result->dir = start;
break;
case '\\':
case '/':
if (position == IN_NODE) {
result->nodelen = (int)(filename - start);
position = IN_FILE;
start = ++filename;
result->dir = start;
} else if (position == IN_DEVICE) {
position = IN_FILE;
filename++;
result->dir = start;
result->dirlen = (int)(filename - start);
start = filename;
} else {
filename++;
result->dirlen += (int)(filename - start);
start = filename;
}
break;
case '\0':
if (position == IN_NODE) {
result->nodelen = (int)(filename - start);
} else {
if (filename - start > 0) {
if (assume_last_is_dir) {
if (position == IN_DEVICE) {
result->dir = start;
result->dirlen = 0;
}
result->dirlen += (int)(filename - start);
} else {
result->file = start;
result->filelen = (int)(filename - start);
}
}
}
break;
default:
filename++;
break;
}
}
while (last);
if (!result->nodelen)
result->node = NULL;
if (!result->devicelen)
result->device = NULL;
if (!result->dirlen)
result->dir = NULL;
if (!result->filelen)
result->file = NULL;
return result;
}
static char *win32_joiner(DSO *dso, const struct file_st *file_split)
{
int len = 0, offset = 0;
char *result = NULL;
const char *start;
if (!file_split) {
DSOerr(DSO_F_WIN32_JOINER, ERR_R_PASSED_NULL_PARAMETER);
return NULL;
}
if (file_split->node) {
len += 2 + file_split->nodelen; /* 2 for starting \\ */
if (file_split->predir || file_split->dir || file_split->file)
len++; /* 1 for ending \ */
} else if (file_split->device) {
len += file_split->devicelen + 1; /* 1 for ending : */
}
len += file_split->predirlen;
if (file_split->predir && (file_split->dir || file_split->file)) {
len++; /* 1 for ending \ */
}
len += file_split->dirlen;
if (file_split->dir && file_split->file) {
len++; /* 1 for ending \ */
}
len += file_split->filelen;
if (!len) {
DSOerr(DSO_F_WIN32_JOINER, DSO_R_EMPTY_FILE_STRUCTURE);
return NULL;
}
result = OPENSSL_malloc(len + 1);
if (result == NULL) {
DSOerr(DSO_F_WIN32_JOINER, ERR_R_MALLOC_FAILURE);
return NULL;
}
if (file_split->node) {
strcpy(&result[offset], "\\\\");
offset += 2;
strncpy(&result[offset], file_split->node, file_split->nodelen);
offset += file_split->nodelen;
if (file_split->predir || file_split->dir || file_split->file) {
result[offset] = '\\';
offset++;
}
} else if (file_split->device) {
strncpy(&result[offset], file_split->device, file_split->devicelen);
offset += file_split->devicelen;
result[offset] = ':';
offset++;
}
start = file_split->predir;
while (file_split->predirlen > (start - file_split->predir)) {
const char *end = openssl_strnchr(start, '/',
file_split->predirlen - (start -
file_split->predir));
if (!end)
end = start
+ file_split->predirlen - (start - file_split->predir);
strncpy(&result[offset], start, end - start);
offset += (int)(end - start);
result[offset] = '\\';
offset++;
start = end + 1;
}
start = file_split->dir;
while (file_split->dirlen > (start - file_split->dir)) {
const char *end = openssl_strnchr(start, '/',
file_split->dirlen - (start -
file_split->dir));
if (!end)
end = start + file_split->dirlen - (start - file_split->dir);
strncpy(&result[offset], start, end - start);
offset += (int)(end - start);
result[offset] = '\\';
offset++;
start = end + 1;
}
strncpy(&result[offset], file_split->file, file_split->filelen);
offset += file_split->filelen;
result[offset] = '\0';
return result;
}
static char *win32_merger(DSO *dso, const char *filespec1,
const char *filespec2)
{
char *merged = NULL;
struct file_st *filespec1_split = NULL;
struct file_st *filespec2_split = NULL;
if (!filespec1 && !filespec2) {
DSOerr(DSO_F_WIN32_MERGER, ERR_R_PASSED_NULL_PARAMETER);
return NULL;
}
if (!filespec2) {
merged = OPENSSL_strdup(filespec1);
if (merged == NULL) {
DSOerr(DSO_F_WIN32_MERGER, ERR_R_MALLOC_FAILURE);
return NULL;
}
} else if (!filespec1) {
merged = OPENSSL_strdup(filespec2);
if (merged == NULL) {
DSOerr(DSO_F_WIN32_MERGER, ERR_R_MALLOC_FAILURE);
return NULL;
}
} else {
filespec1_split = win32_splitter(dso, filespec1, 0);
if (!filespec1_split) {
DSOerr(DSO_F_WIN32_MERGER, ERR_R_MALLOC_FAILURE);
return NULL;
}
filespec2_split = win32_splitter(dso, filespec2, 1);
if (!filespec2_split) {
DSOerr(DSO_F_WIN32_MERGER, ERR_R_MALLOC_FAILURE);
OPENSSL_free(filespec1_split);
return NULL;
}
/* Fill in into filespec1_split */
if (!filespec1_split->node && !filespec1_split->device) {
filespec1_split->node = filespec2_split->node;
filespec1_split->nodelen = filespec2_split->nodelen;
filespec1_split->device = filespec2_split->device;
filespec1_split->devicelen = filespec2_split->devicelen;
}
if (!filespec1_split->dir) {
filespec1_split->dir = filespec2_split->dir;
filespec1_split->dirlen = filespec2_split->dirlen;
} else if (filespec1_split->dir[0] != '\\'
&& filespec1_split->dir[0] != '/') {
filespec1_split->predir = filespec2_split->dir;
filespec1_split->predirlen = filespec2_split->dirlen;
}
if (!filespec1_split->file) {
filespec1_split->file = filespec2_split->file;
filespec1_split->filelen = filespec2_split->filelen;
}
merged = win32_joiner(dso, filespec1_split);
}
OPENSSL_free(filespec1_split);
OPENSSL_free(filespec2_split);
return merged;
}
static char *win32_name_converter(DSO *dso, const char *filename)
{
char *translated;
int len, transform;
len = strlen(filename);
transform = ((strstr(filename, "/") == NULL) &&
(strstr(filename, "\\") == NULL) &&
(strstr(filename, ":") == NULL));
if (transform)
/* We will convert this to "%s.dll" */
translated = OPENSSL_malloc(len + 5);
else
/* We will simply duplicate filename */
translated = OPENSSL_malloc(len + 1);
if (translated == NULL) {
DSOerr(DSO_F_WIN32_NAME_CONVERTER, DSO_R_NAME_TRANSLATION_FAILED);
return NULL;
}
if (transform)
sprintf(translated, "%s.dll", filename);
else
sprintf(translated, "%s", filename);
return translated;
}
static const char *openssl_strnchr(const char *string, int c, size_t len)
{
size_t i;
const char *p;
for (i = 0, p = string; i < len && *p; i++, p++) {
if (*p == c)
return p;
}
return NULL;
}
# include <tlhelp32.h>
# ifdef _WIN32_WCE
# define DLLNAME "TOOLHELP.DLL"
# else
# ifdef MODULEENTRY32
# undef MODULEENTRY32 /* unmask the ASCII version! */
# endif
# define DLLNAME "KERNEL32.DLL"
# endif
typedef HANDLE(WINAPI *CREATETOOLHELP32SNAPSHOT) (DWORD, DWORD);
typedef BOOL(WINAPI *CLOSETOOLHELP32SNAPSHOT) (HANDLE);
typedef BOOL(WINAPI *MODULE32) (HANDLE, MODULEENTRY32 *);
static void *win32_globallookup(const char *name)
{
HMODULE dll;
HANDLE hModuleSnap = INVALID_HANDLE_VALUE;
MODULEENTRY32 me32;
CREATETOOLHELP32SNAPSHOT create_snap;
CLOSETOOLHELP32SNAPSHOT close_snap;
MODULE32 module_first, module_next;
union {
void *p;
FARPROC f;
} ret = { NULL };
dll = LoadLibrary(TEXT(DLLNAME));
if (dll == NULL) {
DSOerr(DSO_F_WIN32_GLOBALLOOKUP, DSO_R_UNSUPPORTED);
return NULL;
}
create_snap = (CREATETOOLHELP32SNAPSHOT)
GetProcAddress(dll, "CreateToolhelp32Snapshot");
if (create_snap == NULL) {
FreeLibrary(dll);
DSOerr(DSO_F_WIN32_GLOBALLOOKUP, DSO_R_UNSUPPORTED);
return NULL;
}
/* We take the rest for granted... */
# ifdef _WIN32_WCE
close_snap = (CLOSETOOLHELP32SNAPSHOT)
GetProcAddress(dll, "CloseToolhelp32Snapshot");
# else
close_snap = (CLOSETOOLHELP32SNAPSHOT) CloseHandle;
# endif
module_first = (MODULE32) GetProcAddress(dll, "Module32First");
module_next = (MODULE32) GetProcAddress(dll, "Module32Next");
hModuleSnap = (*create_snap) (TH32CS_SNAPMODULE, 0);
if (hModuleSnap == INVALID_HANDLE_VALUE) {
FreeLibrary(dll);
DSOerr(DSO_F_WIN32_GLOBALLOOKUP, DSO_R_UNSUPPORTED);
return NULL;
}
me32.dwSize = sizeof(me32);
if (!(*module_first) (hModuleSnap, &me32)) {
(*close_snap) (hModuleSnap);
FreeLibrary(dll);
return NULL;
}
do {
if ((ret.f = GetProcAddress(me32.hModule, name))) {
(*close_snap) (hModuleSnap);
FreeLibrary(dll);
return ret.p;
}
} while ((*module_next) (hModuleSnap, &me32));
(*close_snap) (hModuleSnap);
FreeLibrary(dll);
return NULL;
}
#endif /* DSO_WIN32 */
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