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- /* dso_win32.c -*- mode:C; c-file-style: "eay" -*- */
- /* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
- * project 2000.
- */
- /* ====================================================================
- * Copyright (c) 2000 The OpenSSL Project. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. All advertising materials mentioning features or use of this
- * software must display the following acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
- *
- * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
- * endorse or promote products derived from this software without
- * prior written permission. For written permission, please contact
- * licensing@OpenSSL.org.
- *
- * 5. Products derived from this software may not be called "OpenSSL"
- * nor may "OpenSSL" appear in their names without prior written
- * permission of the OpenSSL Project.
- *
- * 6. Redistributions of any form whatsoever must retain the following
- * acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
- *
- * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
- * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- * ====================================================================
- *
- * This product includes cryptographic software written by Eric Young
- * (eay@cryptsoft.com). This product includes software written by Tim
- * Hudson (tjh@cryptsoft.com).
- *
- */
- #include <stdio.h>
- #include <string.h>
- #include "cryptlib.h"
- #include <openssl/dso.h>
- #if !defined(DSO_WIN32)
- DSO_METHOD *DSO_METHOD_win32(void)
- {
- return NULL;
- }
- #else
- #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 void *win32_bind_var(DSO *dso, const char *symname);
- static DSO_FUNC_TYPE win32_bind_func(DSO *dso, const char *symname);
- #if 0
- static int win32_unbind_var(DSO *dso, char *symname, void *symptr);
- static int win32_unbind_func(DSO *dso, char *symname, DSO_FUNC_TYPE symptr);
- static int win32_init(DSO *dso);
- static int win32_finish(DSO *dso);
- static long win32_ctrl(DSO *dso, int cmd, long larg, void *parg);
- #endif
- static char *win32_name_converter(DSO *dso, const char *filename);
- static char *win32_merger(DSO *dso, const char *filespec1,
- const char *filespec2);
- static int win32_pathbyaddr(void *addr,char *path,int sz);
- 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_var,
- win32_bind_func,
- /* For now, "unbind" doesn't exist */
- #if 0
- NULL, /* unbind_var */
- NULL, /* unbind_func */
- #endif
- NULL, /* ctrl */
- win32_name_converter,
- win32_merger,
- NULL, /* init */
- NULL, /* finish */
- win32_pathbyaddr,
- win32_globallookup
- };
- DSO_METHOD *DSO_METHOD_win32(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 = (HINSTANCE *)OPENSSL_malloc(sizeof(HINSTANCE));
- if(p == NULL)
- {
- DSOerr(DSO_F_WIN32_LOAD,ERR_R_MALLOC_FAILURE);
- goto err;
- }
- *p = h;
- if(!sk_push(dso->meth_data, (char *)p))
- {
- DSOerr(DSO_F_WIN32_LOAD,DSO_R_STACK_ERROR);
- goto err;
- }
- /* Success */
- dso->loaded_filename = filename;
- return(1);
- err:
- /* Cleanup !*/
- if(filename != NULL)
- OPENSSL_free(filename);
- if(p != NULL)
- 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_num(dso->meth_data) < 1)
- return(1);
- p = (HINSTANCE *)sk_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_push(dso->meth_data, (char *)p);
- return(0);
- }
- /* Cleanup */
- OPENSSL_free(p);
- return(1);
- }
- /* Using GetProcAddress for variables? TODO: Check this out in
- * the Win32 API docs, there's probably a variant for variables. */
- static void *win32_bind_var(DSO *dso, const char *symname)
- {
- HINSTANCE *ptr;
- void *sym;
- if((dso == NULL) || (symname == NULL))
- {
- DSOerr(DSO_F_WIN32_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
- return(NULL);
- }
- if(sk_num(dso->meth_data) < 1)
- {
- DSOerr(DSO_F_WIN32_BIND_VAR,DSO_R_STACK_ERROR);
- return(NULL);
- }
- ptr = (HINSTANCE *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
- if(ptr == NULL)
- {
- DSOerr(DSO_F_WIN32_BIND_VAR,DSO_R_NULL_HANDLE);
- return(NULL);
- }
- sym = GetProcAddress(*ptr, symname);
- if(sym == NULL)
- {
- DSOerr(DSO_F_WIN32_BIND_VAR,DSO_R_SYM_FAILURE);
- ERR_add_error_data(3, "symname(", symname, ")");
- return(NULL);
- }
- return(sym);
- }
- static DSO_FUNC_TYPE win32_bind_func(DSO *dso, const char *symname)
- {
- HINSTANCE *ptr;
- void *sym;
- if((dso == NULL) || (symname == NULL))
- {
- DSOerr(DSO_F_WIN32_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
- return(NULL);
- }
- if(sk_num(dso->meth_data) < 1)
- {
- DSOerr(DSO_F_WIN32_BIND_FUNC,DSO_R_STACK_ERROR);
- return(NULL);
- }
- ptr = (HINSTANCE *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
- if(ptr == NULL)
- {
- DSOerr(DSO_F_WIN32_BIND_FUNC,DSO_R_NULL_HANDLE);
- return(NULL);
- }
- sym = GetProcAddress(*ptr, symname);
- if(sym == 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);
- }
- 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);
- /*goto err;*/
- return(NULL);
- }
- result = OPENSSL_malloc(sizeof(struct file_st));
- if(result == NULL)
- {
- DSOerr(DSO_F_WIN32_SPLITTER,
- ERR_R_MALLOC_FAILURE);
- return(NULL);
- }
- memset(result, 0, sizeof(struct file_st));
- 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);
- /*goto err;*/
- return(NULL);
- }
- result->device = start;
- result->devicelen = filename - start;
- position = IN_FILE;
- start = ++filename;
- result->dir = start;
- break;
- case '\\':
- case '/':
- if(position == IN_NODE)
- {
- result->nodelen = filename - start;
- position = IN_FILE;
- start = ++filename;
- result->dir = start;
- }
- else if(position == IN_DEVICE)
- {
- position = IN_FILE;
- filename++;
- result->dir = start;
- result->dirlen = filename - start;
- start = filename;
- }
- else
- {
- filename++;
- result->dirlen += filename - start;
- start = filename;
- }
- break;
- case '\0':
- if(position == IN_NODE)
- {
- result->nodelen = filename - start;
- }
- else
- {
- if(filename - start > 0)
- {
- if (assume_last_is_dir)
- {
- if (position == IN_DEVICE)
- {
- result->dir = start;
- result->dirlen = 0;
- }
- result->dirlen +=
- filename - start;
- }
- else
- {
- result->file = start;
- result->filelen =
- 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)
- {
- 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 += end - start;
- result[offset] = '\\'; offset++;
- start = end + 1;
- }
- #if 0 /* Not needed, since the directory converter above already appeneded
- a backslash */
- if(file_split->predir && (file_split->dir || file_split->file))
- {
- result[offset] = '\\'; offset++;
- }
- #endif
- 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 += end - start;
- result[offset] = '\\'; offset++;
- start = end + 1;
- }
- #if 0 /* Not needed, since the directory converter above already appeneded
- a backslash */
- if(file_split->dir && file_split->file)
- {
- result[offset] = '\\'; offset++;
- }
- #endif
- 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_malloc(strlen(filespec1) + 1);
- if(!merged)
- {
- DSOerr(DSO_F_WIN32_MERGER,
- ERR_R_MALLOC_FAILURE);
- return(NULL);
- }
- strcpy(merged, filespec1);
- }
- else if (!filespec1)
- {
- merged = OPENSSL_malloc(strlen(filespec2) + 1);
- if(!merged)
- {
- DSOerr(DSO_F_WIN32_MERGER,
- ERR_R_MALLOC_FAILURE);
- return(NULL);
- }
- strcpy(merged, filespec2);
- }
- 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);
- }
- 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 int win32_pathbyaddr(void *addr,char *path,int sz)
- {
- HMODULE dll;
- HANDLE hModuleSnap = INVALID_HANDLE_VALUE;
- MODULEENTRY32 me32;
- CREATETOOLHELP32SNAPSHOT create_snap;
- CLOSETOOLHELP32SNAPSHOT close_snap;
- MODULE32 module_first, module_next;
- int len;
-
- if (addr == NULL)
- {
- union { int(*f)(void*,char*,int); void *p; } t =
- { win32_pathbyaddr };
- addr = t.p;
- }
- dll = LoadLibrary(TEXT(DLLNAME));
- if (dll == NULL)
- {
- DSOerr(DSO_F_WIN32_PATHBYADDR,DSO_R_UNSUPPORTED);
- return -1;
- }
- create_snap = (CREATETOOLHELP32SNAPSHOT)
- GetProcAddress(dll,"CreateToolhelp32Snapshot");
- if (create_snap == NULL)
- {
- FreeLibrary(dll);
- DSOerr(DSO_F_WIN32_PATHBYADDR,DSO_R_UNSUPPORTED);
- return -1;
- }
- /* 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_PATHBYADDR,DSO_R_UNSUPPORTED);
- return -1;
- }
-
- me32.dwSize = sizeof(me32);
-
- if(!(*module_first)(hModuleSnap,&me32))
- {
- (*close_snap)(hModuleSnap);
- FreeLibrary(dll);
- DSOerr(DSO_F_WIN32_PATHBYADDR,DSO_R_FAILURE);
- return -1;
- }
-
- do {
- if ((BYTE *)addr >= me32.modBaseAddr &&
- (BYTE *)addr < me32.modBaseAddr+me32.modBaseSize)
- {
- (*close_snap)(hModuleSnap);
- FreeLibrary(dll);
- #ifdef _WIN32_WCE
- # if _WIN32_WCE >= 101
- return WideCharToMultiByte(CP_ACP,0,me32.szExePath,-1,
- path,sz,NULL,NULL);
- # else
- len = (int)wcslen(me32.szExePath);
- if (sz <= 0) return len+1;
- if (len >= sz) len=sz-1;
- for(i=0;i<len;i++)
- path[i] = (char)me32.szExePath[i];
- path[len++] = 0;
- return len;
- # endif
- #else
- len = (int)strlen(me32.szExePath);
- if (sz <= 0) return len+1;
- if (len >= sz) len=sz-1;
- memcpy(path,me32.szExePath,len);
- path[len++] = 0;
- return len;
- #endif
- }
- } while((*module_next)(hModuleSnap, &me32));
-
- (*close_snap)(hModuleSnap);
- FreeLibrary(dll);
- return 0;
- }
- 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;
- FARPROC 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 = GetProcAddress(me32.hModule,name))
- {
- (*close_snap)(hModuleSnap);
- FreeLibrary(dll);
- return ret;
- }
- } while((*module_next)(hModuleSnap,&me32));
- (*close_snap)(hModuleSnap);
- FreeLibrary(dll);
- return NULL;
- }
- #endif /* DSO_WIN32 */
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