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         /* do NOT call dlerror() here ! (check after return) */
  61         if(handle)
  62                 return handle;
  63
  64         /* Now try to construct searches through our extra search-path */
  65         namelen = strlen(libname);
  66         ldpath = extra_ld_library_path;
  67         while(ldpath && *ldpath)
  68         {
  69                 int len;
  70                 char *cptr;
  71                 char *from;
  72
  73                 from = ldpath;
  74                 cptr = strchr(ldpath, ':');
  75                 if(!cptr)
  76                 {
  77                         len = strlen(ldpath);
  78                         ldpath = NULL;
  79                 }
  80                 else
  81                 {
  82                         len = cptr - ldpath;
  83                         ldpath = cptr + 1;
  84                 }
  85
  86                 if(len + namelen + 1 >= sizeof(buffer))
  87                 {
  88                         ERR("Buffer overflow! Check EXTRA_LD_LIBRARY_PATH or increase buffer size.\n");
  89                         return NULL;
  90                 }
  91
  92                 strncpy(buffer, from, len);
  93                 if(len)
  94                 {
  95                         buffer[len] = '/';
  96                         strcpy(buffer + len + 1, libname);
  97                 }
  98                 else
  99                         strcpy(buffer + len, libname);
 100
 101                 TRACE("Trying dlopen('%s', %d)\n", buffer, flags);
 102
 103                 handle = dlopen(buffer, flags);
 104                 /* do NOT call dlerror() here ! (check after return) */
 105                 if(handle)
 106                         return handle;
 107         }
 108         return NULL;
 109 }
 110
 111
 112 /****************************************************************************
 113  *      get_sobasename  (internal)
 114  *
 115  */
 116 static LPSTR get_sobasename(LPCSTR path, LPSTR name)
 117 {
 118         char *cptr;
 119
 120         /* Strip the path from the library name */
 121         if((cptr = strrchr(path, '/')))
 122         {
 123                 char *cp = strrchr(cptr+1, '\\');
 124                 if(cp && cp > cptr)
 125                         cptr = cp;
 126         }
 127         else
 128                 cptr = strrchr(path, '\\');
 129
 130         if(!cptr)
 131                 cptr = (char *)path;    /* No '/' nor '\\' in path */
 132         else
 133                 cptr++;
 134
 135         strcpy(name, cptr);
 136         cptr = strrchr(name, '.');
 137         if(cptr)
 138                 *cptr = '\0';   /* Strip extension */
 139
 140         /* Convert to lower case.
 141          * This must be done manually because it is not sure that
 142          * other modules are accessible.
 143          */
 144         for(cptr = name; *cptr; cptr++)
 145                 *cptr = tolower(*cptr);
 146
 147         return name;
 148 }
 149
 150
 151 /****************************************************************************
 152  *      ELFDLL_LoadLibraryExA   (internal)
 153  *
 154  * Implementation of elf-dll loading for PE modules
 155  */
 156 WINE_MODREF *ELFDLL_LoadLibraryExA(LPCSTR path, DWORD flags)
 157 {
 158         LPVOID dlhandle;
 159         struct elfdll_image *image;
 160         char name[129];
 161         char soname[129];
 162         WINE_MODREF *wm;
 163
 164         get_sobasename(path, name);
 165         strcpy(soname, name);
 166         strcat(soname, ".so");
 167
 168         /* Try to open the elf-dll */
 169         dlhandle = ELFDLL_dlopen(soname, RTLD_LAZY);
 170         if(!dlhandle)
 171         {
 172                 WARN("Could not load %s (%s)\n", soname, dlerror());
 173                 SetLastError( ERROR_FILE_NOT_FOUND );
 174                 return NULL;
 175         }
 176
 177         /* Get the 'dllname_elfdll_image' variable */
 178         strcpy(soname, name);
 179         strcat(soname, "_elfdll_image");
 180         image = (struct elfdll_image *)dlsym(dlhandle, soname);
 181         if(!image)
 182         {
 183                 ERR("Could not get elfdll image descriptor %s (%s)\n", soname, dlerror());
 184                 dlclose(dlhandle);
 185                 SetLastError( ERROR_BAD_FORMAT );
 186                 return NULL;
 187         }
 188
 189         wm = PE_CreateModule( image->pe_module_start, path, 0, -1, FALSE );
 190         if(!wm)
 191         {
 192                 ERR("Could not create WINE_MODREF for %s\n", path);
 193                 dlclose(dlhandle);
 194                 SetLastError( ERROR_OUTOFMEMORY );
 195                 return NULL;
 196         }
 197         wm->dlhandle = dlhandle;
 198
 199         dump_exports(image->pe_module_start);
 200         return wm;
 201 }
 202
 203 #else
 204
 205 /*
 206  * No elfdlls possible
 207  * Just put stubs in here.
 208  */
 209
 210 WINE_MODREF *ELFDLL_LoadLibraryExA(LPCSTR libname, DWORD flags)
 211 {
 212         SetLastError( ERROR_FILE_NOT_FOUND );
 213         return NULL;
 214 }
 215
 216 #endif