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Sweden-Number/library/loader.c

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/*
* Win32 builtin dlls support
*
* Copyright 2000 Alexandre Julliard
*/
#include "config.h"
#include <assert.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#include "winnt.h"
#include "wine/library.h"
#include "wine/port.h"
#define MAX_DLLS 100
static struct
{
const IMAGE_NT_HEADERS *nt; /* NT header */
const char *filename; /* DLL file name */
} builtin_dlls[MAX_DLLS];
static int nb_dlls;
static const IMAGE_NT_HEADERS *main_exe;
static load_dll_callback_t load_dll_callback;
static char **dll_paths;
static int nb_dll_paths;
static int dll_path_maxlen;
static int init_done;
/* build the dll load path from the WINEDLLPATH variable */
static void build_dll_path(void)
{
int count = 0;
char *p, *path = getenv( "WINEDLLPATH" );
init_done = 1;
if (!path) return;
path = strdup(path);
p = path;
while (*p)
{
while (*p == ':') p++;
if (!*p) break;
count++;
while (*p && *p != ':') p++;
}
dll_paths = malloc( count * sizeof(*dll_paths) );
p = path;
nb_dll_paths = 0;
while (*p)
{
while (*p == ':') *p++ = 0;
if (!*p) break;
dll_paths[nb_dll_paths] = p;
while (*p && *p != ':') p++;
if (p - dll_paths[nb_dll_paths] > dll_path_maxlen)
dll_path_maxlen = p - dll_paths[nb_dll_paths];
nb_dll_paths++;
}
}
/* open a library for a given dll, searching in the dll path
* 'name' must be the Windows dll name (e.g. "kernel32.dll") */
static void *dlopen_dll( const char *name, char *error, int errorsize )
{
int i, namelen = strlen(name);
char *buffer, *p, *ext;
void *ret = NULL;
if (!init_done) build_dll_path();
buffer = malloc( dll_path_maxlen + namelen + 8 );
/* store the name at the end of the buffer, prefixed by /lib and followed by .so */
p = buffer + dll_path_maxlen;
memcpy( p, "/lib", 4 );
p += 4;
memcpy( p, name, namelen+1 );
ext = strrchr( p, '.' );
p += namelen;
/* check for .dll or .exe extension to remove */
if (ext && (!strcmp( ext, ".dll" ) || !strcmp( ext, ".exe" ))) p = ext;
memcpy( p, ".so", 4 );
for (i = 0; i < nb_dll_paths; i++)
{
int len = strlen(dll_paths[i]);
char *p = buffer + dll_path_maxlen - len;
memcpy( p, dll_paths[i], len );
if ((ret = wine_dlopen( p, RTLD_NOW, error, errorsize ))) break;
}
/* now try the default dlopen search path */
if (!ret)
ret = wine_dlopen( buffer + dll_path_maxlen + 1, RTLD_NOW, error, errorsize );
free( buffer );
return ret;
}
/* adjust an array of pointers to make them into RVAs */
static inline void fixup_rva_ptrs( void *array, void *base, int count )
{
void **ptr = (void **)array;
while (count--)
{
if (*ptr) *ptr = (void *)((char *)*ptr - (char *)base);
ptr++;
}
}
/* fixup RVAs in the resource directory */
static void fixup_resources( IMAGE_RESOURCE_DIRECTORY *dir, char *root, void *base )
{
IMAGE_RESOURCE_DIRECTORY_ENTRY *entry;
int i;
entry = (IMAGE_RESOURCE_DIRECTORY_ENTRY *)(dir + 1);
for (i = 0; i < dir->NumberOfNamedEntries + dir->NumberOfIdEntries; i++, entry++)
{
void *ptr = root + entry->u2.s3.OffsetToDirectory;
if (entry->u2.s3.DataIsDirectory) fixup_resources( ptr, root, base );
else
{
IMAGE_RESOURCE_DATA_ENTRY *data = ptr;
fixup_rva_ptrs( &data->OffsetToData, base, 1 );
}
}
}
/* map a builtin dll in memory and fixup RVAs */
static void *map_dll( const IMAGE_NT_HEADERS *nt_descr )
{
IMAGE_DATA_DIRECTORY *dir;
IMAGE_DOS_HEADER *dos;
IMAGE_NT_HEADERS *nt;
IMAGE_SECTION_HEADER *sec;
BYTE *addr, *code_start, *data_start;
size_t page_size = getpagesize();
int nb_sections = 2; /* code + data */
size_t size = (sizeof(IMAGE_DOS_HEADER)
+ sizeof(IMAGE_NT_HEADERS)
+ nb_sections * sizeof(IMAGE_SECTION_HEADER));
assert( size <= page_size );
if (nt_descr->OptionalHeader.ImageBase)
{
addr = wine_anon_mmap( (void *)nt_descr->OptionalHeader.ImageBase,
page_size, PROT_READ|PROT_WRITE, MAP_FIXED );
if (addr != (BYTE *)nt_descr->OptionalHeader.ImageBase) return NULL;
}
else
{
/* this will leak memory; but it should never happen */
addr = wine_anon_mmap( NULL, page_size, PROT_READ|PROT_WRITE, 0 );
if (addr == (BYTE *)-1) return NULL;
}
dos = (IMAGE_DOS_HEADER *)addr;
nt = (IMAGE_NT_HEADERS *)(dos + 1);
sec = (IMAGE_SECTION_HEADER *)(nt + 1);
code_start = addr + page_size;
/* HACK! */
data_start = code_start + page_size;
/* Build the DOS and NT headers */
dos->e_magic = IMAGE_DOS_SIGNATURE;
dos->e_lfanew = sizeof(*dos);
*nt = *nt_descr;
nt->FileHeader.NumberOfSections = nb_sections;
nt->OptionalHeader.SizeOfCode = data_start - code_start;
nt->OptionalHeader.SizeOfInitializedData = 0;
nt->OptionalHeader.SizeOfUninitializedData = 0;
nt->OptionalHeader.ImageBase = (DWORD)addr;
fixup_rva_ptrs( &nt->OptionalHeader.AddressOfEntryPoint, addr, 1 );
/* Build the code section */
strcpy( sec->Name, ".text" );
sec->SizeOfRawData = data_start - code_start;
sec->Misc.VirtualSize = sec->SizeOfRawData;
sec->VirtualAddress = code_start - addr;
sec->PointerToRawData = code_start - addr;
sec->Characteristics = (IMAGE_SCN_CNT_CODE | IMAGE_SCN_MEM_EXECUTE | IMAGE_SCN_MEM_READ);
sec++;
/* Build the data section */
strcpy( sec->Name, ".data" );
sec->SizeOfRawData = 0;
sec->Misc.VirtualSize = sec->SizeOfRawData;
sec->VirtualAddress = data_start - addr;
sec->PointerToRawData = data_start - addr;
sec->Characteristics = (IMAGE_SCN_CNT_INITIALIZED_DATA |
IMAGE_SCN_MEM_WRITE | IMAGE_SCN_MEM_READ);
sec++;
/* Build the import directory */
dir = &nt->OptionalHeader.DataDirectory[IMAGE_FILE_IMPORT_DIRECTORY];
if (dir->Size)
{
IMAGE_IMPORT_DESCRIPTOR *imports = (void *)dir->VirtualAddress;
fixup_rva_ptrs( &dir->VirtualAddress, addr, 1 );
/* we can fixup everything at once since we only have pointers and 0 values */
fixup_rva_ptrs( imports, addr, dir->Size / sizeof(void*) );
}
/* Build the resource directory */
dir = &nt->OptionalHeader.DataDirectory[IMAGE_FILE_RESOURCE_DIRECTORY];
if (dir->Size)
{
void *ptr = (void *)dir->VirtualAddress;
fixup_rva_ptrs( &dir->VirtualAddress, addr, 1 );
fixup_resources( ptr, ptr, addr );
}
/* Build the export directory */
dir = &nt->OptionalHeader.DataDirectory[IMAGE_FILE_EXPORT_DIRECTORY];
if (dir->Size)
{
IMAGE_EXPORT_DIRECTORY *exports = (void *)dir->VirtualAddress;
fixup_rva_ptrs( &dir->VirtualAddress, addr, 1 );
fixup_rva_ptrs( (void *)exports->AddressOfFunctions, addr, exports->NumberOfFunctions );
fixup_rva_ptrs( (void *)exports->AddressOfNames, addr, exports->NumberOfNames );
fixup_rva_ptrs( &exports->Name, addr, 1 );
fixup_rva_ptrs( &exports->AddressOfFunctions, addr, 1 );
fixup_rva_ptrs( &exports->AddressOfNames, addr, 1 );
fixup_rva_ptrs( &exports->AddressOfNameOrdinals, addr, 1 );
}
return addr;
}
/***********************************************************************
* __wine_dll_register
*
* Register a built-in DLL descriptor.
*/
void __wine_dll_register( const IMAGE_NT_HEADERS *header, const char *filename )
{
if (load_dll_callback) load_dll_callback( map_dll(header), filename );
else
{
if (!(header->FileHeader.Characteristics & IMAGE_FILE_DLL))
main_exe = header;
else
{
assert( nb_dlls < MAX_DLLS );
builtin_dlls[nb_dlls].nt = header;
builtin_dlls[nb_dlls].filename = filename;
nb_dlls++;
}
}
}
/***********************************************************************
* wine_dll_set_callback
*
* Set the callback function for dll loading, and call it
* for all dlls that were implicitly loaded already.
*/
void wine_dll_set_callback( load_dll_callback_t load )
{
int i;
load_dll_callback = load;
for (i = 0; i < nb_dlls; i++)
{
const IMAGE_NT_HEADERS *nt = builtin_dlls[i].nt;
if (!nt) continue;
builtin_dlls[i].nt = NULL;
load_dll_callback( map_dll(nt), builtin_dlls[i].filename );
}
nb_dlls = 0;
if (main_exe) load_dll_callback( map_dll(main_exe), "" );
}
/***********************************************************************
* wine_dll_load
*
* Load a builtin dll.
*/
void *wine_dll_load( const char *filename, char *error, int errorsize )
{
int i;
/* callback must have been set already */
assert( load_dll_callback );
/* check if we have it in the list */
/* this can happen when initializing pre-loaded dlls in wine_dll_set_callback */
for (i = 0; i < nb_dlls; i++)
{
if (!builtin_dlls[i].nt) continue;
if (!strcmp( builtin_dlls[i].filename, filename ))
{
const IMAGE_NT_HEADERS *nt = builtin_dlls[i].nt;
builtin_dlls[i].nt = NULL;
load_dll_callback( map_dll(nt), builtin_dlls[i].filename );
return (void *)1;
}
}
return dlopen_dll( filename, error, errorsize );
}
/***********************************************************************
* wine_dll_unload
*
* Unload a builtin dll.
*/
void wine_dll_unload( void *handle )
{
if (handle != (void *)1)
wine_dlclose( handle, NULL, 0 );
}
/***********************************************************************
* wine_dll_load_main_exe
*
* Try to load the .so for the main exe, optionally searching for it in PATH.
*/
void *wine_dll_load_main_exe( const char *name, int search_path, char *error, int errorsize )
{
void *ret = NULL;
const char *path = NULL;
if (search_path) path = getenv( "PATH" );
if (!path)
{
/* no path, try only the specified name */
ret = wine_dlopen( name, RTLD_NOW, error, errorsize );
}
else
{
char buffer[128], *tmp = buffer;
size_t namelen = strlen(name);
size_t pathlen = strlen(path);
if (namelen + pathlen + 2 > sizeof(buffer)) tmp = malloc( namelen + pathlen + 2 );
if (tmp)
{
char *basename = tmp + pathlen;
*basename = '/';
strcpy( basename + 1, name );
for (;;)
{
int len;
const char *p = strchr( path, ':' );
if (!p) p = path + strlen(path);
if ((len = p - path) > 0)
{
memcpy( basename - len, path, len );
if ((ret = wine_dlopen( basename - len, RTLD_NOW, error, errorsize ))) break;
}
if (!*p) break;
path = p + 1;
}
if (tmp != buffer) free( tmp );
}
}
return ret;
}
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