loader/elfdll.c

   1 /*
   2  * Elf-dll loader functions
   3  *
   4  * Copyright 1999 Bertho A. Stultiens
   5  */
   6
   7 #include <string.h>
   8 #include <ctype.h>
   9 #include <stdlib.h>
  10
  11 #include "config.h"
  12 #include "windef.h"
  13 #include "global.h"
  14 #include "process.h"
  15 #include "module.h"
  16 #include "neexe.h"
  17 #include "heap.h"
  18 #include "wine/winbase16.h"
  19 #include "elfdll.h"
  20 #include "debugtools.h"
  21 #include "winerror.h"
  22
  23 DEFAULT_DEBUG_CHANNEL(elfdll)
  24
  25 #if defined(HAVE_DL_API)
  26 #include <dlfcn.h>
  27
  28 /*------------------ HACKS -----------------*/
  29 extern DWORD fixup_imports(WINE_MODREF *wm);
  30 extern void dump_exports(HMODULE hModule);
  31 /*---------------- END HACKS ---------------*/
  32
  33 char *extra_ld_library_path = NULL;     /* The extra search-path set in wine.conf */
  34
  35 struct elfdll_image
  36 {
  37         HMODULE         pe_module_start;
  38         DWORD           pe_module_size;
  39         NE_MODULE       *ne_module_start;
  40         DWORD           ne_module_size;
  41 };
  42
  43
  44 /****************************************************************************
  45  *      ELFDLL_dlopen
  46  *
  47  * Wrapper for dlopen to search the EXTRA_LD_LIBRARY_PATH from wine.conf
  48  * manually because libdl.so caches the environment and does not accept our
  49  * changes.
  50  */
  51 void *ELFDLL_dlopen(const char *libname, int flags)
  52 {
  53         char buffer[256];
  54         int namelen;
  55         void *handle;
  56         char *ldpath;
  57
  58         /* First try the default path search of dlopen() */
  59         handle = dlopen(libname, flags);
  60         if(handle)
  61                 return handle;
  62
  63         /* Now try to construct searches through our extra search-path */
  64         namelen = strlen(libname);
  65         ldpath = extra_ld_library_path;
  66         while(ldpath && *ldpath)
  67         {
  68                 int len;
  69                 char *cptr;
  70                 char *from;
  71
  72                 from = ldpath;
  73                 cptr = strchr(ldpath, ':');
  74                 if(!cptr)
  75                 {
  76                         len = strlen(ldpath);
  77                         ldpath = NULL;
  78                 }
  79                 else
  80                 {
  81                         len = cptr - ldpath;
  82                         ldpath = cptr + 1;
  83                 }
  84
  85                 if(len + namelen + 1 >= sizeof(buffer))
  86                 {
  87                         ERR("Buffer overflow! Check EXTRA_LD_LIBRARY_PATH or increase buffer size.\n");
  88                         return NULL;
  89                 }
  90
  91                 strncpy(buffer, from, len);
  92                 if(len)
  93                 {
  94                         buffer[len] = '/';
  95                         strcpy(buffer + len + 1, libname);
  96                 }
  97                 else
  98                         strcpy(buffer + len, libname);
  99
 100                 TRACE("Trying dlopen('%s', %d)\n", buffer, flags);
 101
 102                 handle = dlopen(buffer, flags);
 103                 if(handle)
 104                         return handle;
 105         }
 106         return NULL;
 107 }
 108
 109
 110 /****************************************************************************
 111  *      get_sobasename  (internal)
 112  *
 113  */
 114 static LPSTR get_sobasename(LPCSTR path, LPSTR name)
 115 {
 116         char *cptr;
 117
 118         /* Strip the path from the library name */
 119         if((cptr = strrchr(path, '/')))
 120         {
 121                 char *cp = strrchr(cptr+1, '\\');
 122                 if(cp && cp > cptr)
 123                         cptr = cp;
 124         }
 125         else
 126                 cptr = strrchr(path, '\\');
 127
 128         if(!cptr)
 129                 cptr = (char *)path;    /* No '/' nor '\\' in path */
 130         else
 131                 cptr++;
 132
 133         strcpy(name, cptr);
 134         cptr = strrchr(name, '.');
 135         if(cptr)
 136                 *cptr = '\0';   /* Strip extension */
 137
 138         /* Convert to lower case.
 139          * This must be done manually because it is not sure that
 140          * other modules are accessible.
 141          */
 142         for(cptr = name; *cptr; cptr++)
 143                 *cptr = tolower(*cptr);
 144
 145         return name;
 146 }
 147
 148
 149 /****************************************************************************
 150  *      ELFDLL_CreateModref     (internal)
 151  *
 152  * INPUT
 153  *      hModule - the header from the elf-dll's data-segment
 154  *      path    - requested path from original call
 155  *
 156  * OUTPUT
 157  *      A WINE_MODREF pointer to the new object
 158  *
 159  * BUGS
 160  *      - Does not handle errors due to dependencies correctly
 161  *      - path can be wrong
 162  */
 163 #define RVA(base, va)   (((DWORD)base) + ((DWORD)va))
 164
 165 static WINE_MODREF *ELFDLL_CreateModref(HMODULE hModule, LPCSTR path)
 166 {
 167         IMAGE_NT_HEADERS *nt = PE_HEADER(hModule);
 168         IMAGE_DATA_DIRECTORY *dir;
 169         IMAGE_IMPORT_DESCRIPTOR *pe_import = NULL;
 170         WINE_MODREF *wm;
 171         int len;
 172         HANDLE procheap = GetProcessHeap();
 173
 174         wm = (WINE_MODREF *)HeapAlloc(procheap, HEAP_ZERO_MEMORY, sizeof(*wm));
 175         if(!wm)
 176                 return NULL;
 177
 178         wm->module = hModule;
 179         wm->type = MODULE32_PE;         /* FIXME */
 180
 181         dir = nt->OptionalHeader.DataDirectory+IMAGE_DIRECTORY_ENTRY_EXPORT;
 182         if(dir->Size)
 183                 wm->binfmt.pe.pe_export = (PIMAGE_EXPORT_DIRECTORY)RVA(hModule, dir->VirtualAddress);
 184
 185         dir = nt->OptionalHeader.DataDirectory+IMAGE_DIRECTORY_ENTRY_IMPORT;
 186         if(dir->Size)
 187                 pe_import = wm->binfmt.pe.pe_import = (PIMAGE_IMPORT_DESCRIPTOR)RVA(hModule, dir->VirtualAddress);
 188
 189         dir = nt->OptionalHeader.DataDirectory+IMAGE_DIRECTORY_ENTRY_RESOURCE;
 190         if(dir->Size)
 191                 wm->binfmt.pe.pe_resource = (PIMAGE_RESOURCE_DIRECTORY)RVA(hModule, dir->VirtualAddress);
 192
 193
 194         wm->filename = HEAP_strdupA( procheap, 0, path );
 195         wm->modname = strrchr( wm->filename, '\\' );
 196         if (!wm->modname) wm->modname = wm->filename;
 197         else wm->modname++;
 198
 199         len = GetShortPathNameA( wm->filename, NULL, 0 );
 200         wm->short_filename = (char *)HeapAlloc( procheap, 0, len+1 );
 201         GetShortPathNameA( wm->filename, wm->short_filename, len+1 );
 202         wm->short_modname = strrchr( wm->short_filename, '\\' );
 203         if (!wm->short_modname) wm->short_modname = wm->short_filename;
 204         else wm->short_modname++;
 205
 206         /* Link MODREF into process list */
 207
 208         EnterCriticalSection( &PROCESS_Current()->crit_section );
 209
 210         wm->next = PROCESS_Current()->modref_list;
 211         PROCESS_Current()->modref_list = wm;
 212         if ( wm->next ) wm->next->prev = wm;
 213
 214         if (    !( nt->FileHeader.Characteristics & IMAGE_FILE_DLL )
 215              && !( wm->flags & WINE_MODREF_LOAD_AS_DATAFILE ) )
 216
 217         {
 218                 if ( PROCESS_Current()->exe_modref )
 219                         FIXME( "Trying to load second .EXE file: %s\n", path );
 220                 else
 221                         PROCESS_Current()->exe_modref = wm;
 222         }
 223
 224         LeaveCriticalSection( &PROCESS_Current()->crit_section );
 225
 226         /* Fixup Imports */
 227
 228         if (    pe_import
 229              && !( wm->flags & WINE_MODREF_LOAD_AS_DATAFILE )
 230              && !( wm->flags & WINE_MODREF_DONT_RESOLVE_REFS )
 231              && fixup_imports( wm ) )
 232         {
 233                 /* remove entry from modref chain */
 234                 EnterCriticalSection( &PROCESS_Current()->crit_section );
 235
 236                 if ( !wm->prev )
 237                         PROCESS_Current()->modref_list = wm->next;
 238                 else
 239                         wm->prev->next = wm->next;
 240
 241                 if ( wm->next ) wm->next->prev = wm->prev;
 242                 wm->next = wm->prev = NULL;
 243
 244                 LeaveCriticalSection( &PROCESS_Current()->crit_section );
 245
 246                 /* FIXME: there are several more dangling references
 247                  * left. Including dlls loaded by this dll before the
 248                  * failed one. Unrolling is rather difficult with the
 249                  * current structure and we can leave it them lying
 250                  * around with no problems, so we don't care.
 251                  * As these might reference our wm, we don't free it.
 252                  */
 253                 return NULL;
 254         }
 255
 256         return wm;
 257 }
 258
 259
 260 /***********************************************************************
 261  *           ELFDLL_CreateNEModule
 262  *
 263  * Create a dummy NE module for the win32 elf-dll based on the supplied
 264  * NE header in the elf-dll.
 265  */
 266 static HMODULE16 ELFDLL_CreateNEModule(NE_MODULE *ne_image, DWORD size)
 267 {
 268         NE_MODULE *pModule;
 269         HMODULE16 hModule = GLOBAL_CreateBlock(GMEM_MOVEABLE, ne_image, size, 0,
 270                                                 FALSE, FALSE, FALSE, NULL);
 271         if(!hModule)
 272                 return (HMODULE16)0;
 273
 274         FarSetOwner16(hModule, hModule);
 275         pModule = (NE_MODULE *)GlobalLock16(hModule);
 276         pModule->self = hModule;
 277         NE_RegisterModule(pModule);
 278         return hModule;
 279 }
 280
 281
 282 /****************************************************************************
 283  *      ELFDLL_LoadLibraryExA   (internal)
 284  *
 285  * Implementation of elf-dll loading for PE modules
 286  */
 287 WINE_MODREF *ELFDLL_LoadLibraryExA(LPCSTR path, DWORD flags)
 288 {
 289         LPVOID dlhandle;
 290         struct elfdll_image *image;
 291         char name[129];
 292         char soname[129];
 293         HMODULE16 hmod16;
 294         WINE_MODREF *wm;
 295
 296         get_sobasename(path, name);
 297         strcpy(soname, name);
 298         strcat(soname, ".so");
 299
 300         /* Try to open the elf-dll */
 301         dlhandle = ELFDLL_dlopen(soname, RTLD_LAZY);
 302         if(!dlhandle)
 303         {
 304                 WARN("Could not load %s (%s)\n", soname, dlerror());
 305                 SetLastError( ERROR_FILE_NOT_FOUND );
 306                 return NULL;
 307         }
 308
 309         /* Get the 'dllname_elfdll_image' variable */
 310         strcpy(soname, name);
 311         strcat(soname, "_elfdll_image");
 312         image = (struct elfdll_image *)dlsym(dlhandle, soname);
 313         if(!image)
 314         {
 315                 ERR("Could not get elfdll image descriptor %s (%s)\n", soname, dlerror());
 316                 dlclose(dlhandle);
 317                 SetLastError( ERROR_BAD_FORMAT );
 318                 return NULL;
 319         }
 320
 321         /* Create a win16 dummy module */
 322         hmod16 = ELFDLL_CreateNEModule(image->ne_module_start, image->ne_module_size);
 323         if(!hmod16)
 324         {
 325                 ERR("Could not create win16 dummy module for %s\n", path);
 326                 dlclose(dlhandle);
 327                 SetLastError( ERROR_OUTOFMEMORY );
 328                 return NULL;
 329         }
 330
 331         image->ne_module_start->module32 = image->pe_module_start;
 332
 333         wm = ELFDLL_CreateModref(image->pe_module_start, path);
 334         if(!wm)
 335         {
 336                 ERR("Could not create WINE_MODREF for %s\n", path);
 337                 GLOBAL_FreeBlock((HGLOBAL16)hmod16);
 338                 dlclose(dlhandle);
 339                 SetLastError( ERROR_OUTOFMEMORY );
 340                 return NULL;
 341         }
 342
 343         dump_exports(image->pe_module_start);
 344         return wm;
 345 }
 346
 347
 348 /****************************************************************************
 349  *      ELFDLL_UnloadLibrary    (internal)
 350  *
 351  * Unload an elf-dll completely from memory and deallocate the modref
 352  */
 353 void ELFDLL_UnloadLibrary(WINE_MODREF *wm)
 354 {
 355 }
 356
 357
 358 /****************************************************************************
 359  *      ELFDLL_LoadModule16     (internal)
 360  *
 361  * Implementation of elf-dll loading for NE modules
 362  */
 363 HINSTANCE16 ELFDLL_LoadModule16(LPCSTR libname)
 364 {
 365         return (HINSTANCE16)ERROR_FILE_NOT_FOUND;
 366 }
 367
 368 #else
 369
 370 /*
 371  * No elfdlls possible
 372  * Just put stubs in here.
 373  */
 374
 375 WINE_MODREF *ELFDLL_LoadLibraryExA(LPCSTR libname, DWORD flags)
 376 {
 377         SetLastError( ERROR_FILE_NOT_FOUND );
 378         return NULL;
 379 }
 380
 381 void ELFDLL_UnloadLibrary(WINE_MODREF *wm)
 382 {
 383 }
 384
 385 HINSTANCE16 ELFDLL_LoadModule16(LPCSTR libname)
 386 {
 387         return (HINSTANCE16)ERROR_FILE_NOT_FOUND;
 388 }
 389
 390 #endif