434 lines
12 KiB
C
434 lines
12 KiB
C
/*
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* Win32 builtin dlls support
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*
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* Copyright 2000 Alexandre Julliard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "config.h"
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#include "wine/port.h"
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#include <assert.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <unistd.h>
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#ifdef HAVE_SYS_MMAN_H
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#include <sys/mman.h>
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#endif
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#include "winnt.h"
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#include "wine/library.h"
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#define MAX_DLLS 100
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static struct
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{
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const IMAGE_NT_HEADERS *nt; /* NT header */
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const char *filename; /* DLL file name */
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} builtin_dlls[MAX_DLLS];
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static int nb_dlls;
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static const IMAGE_NT_HEADERS *main_exe;
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static load_dll_callback_t load_dll_callback;
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static const char **dll_paths;
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static int nb_dll_paths;
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static int dll_path_maxlen;
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static int init_done;
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/* build the dll load path from the WINEDLLPATH variable */
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static void build_dll_path(void)
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{
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static const char * const dlldir = DLLDIR;
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int len, count = 0;
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char *p, *path = getenv( "WINEDLLPATH" );
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init_done = 1;
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if (path)
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{
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/* count how many path elements we need */
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path = strdup(path);
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p = path;
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while (*p)
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{
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while (*p == ':') p++;
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if (!*p) break;
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count++;
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while (*p && *p != ':') p++;
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}
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}
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dll_paths = malloc( (count+1) * sizeof(*dll_paths) );
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if (count)
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{
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p = path;
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nb_dll_paths = 0;
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while (*p)
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{
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while (*p == ':') *p++ = 0;
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if (!*p) break;
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dll_paths[nb_dll_paths] = p;
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while (*p && *p != ':') p++;
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if (p - dll_paths[nb_dll_paths] > dll_path_maxlen)
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dll_path_maxlen = p - dll_paths[nb_dll_paths];
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nb_dll_paths++;
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}
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}
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/* append default dll dir (if not empty) to path */
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if ((len = strlen(dlldir)))
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{
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if (len > dll_path_maxlen) dll_path_maxlen = len;
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dll_paths[nb_dll_paths++] = dlldir;
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}
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}
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/* check if a given file can be opened */
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inline static int file_exists( const char *name )
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{
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int fd = open( name, O_RDONLY );
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if (fd != -1) close( fd );
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return (fd != -1);
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}
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/* open a library for a given dll, searching in the dll path
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* 'name' must be the Windows dll name (e.g. "kernel32.dll") */
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static void *dlopen_dll( const char *name, char *error, int errorsize )
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{
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int i, namelen = strlen(name);
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char *buffer, *p;
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void *ret = NULL;
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if (!init_done) build_dll_path();
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buffer = malloc( dll_path_maxlen + namelen + 5 );
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/* store the name at the end of the buffer, followed by .so */
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p = buffer + dll_path_maxlen;
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*p++ = '/';
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memcpy( p, name, namelen );
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strcpy( p + namelen, ".so" );
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for (i = 0; i < nb_dll_paths; i++)
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{
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int len = strlen(dll_paths[i]);
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p = buffer + dll_path_maxlen - len;
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memcpy( p, dll_paths[i], len );
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if ((ret = wine_dlopen( p, RTLD_NOW, error, errorsize ))) break;
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if (file_exists( p )) /* exists but cannot be loaded, return the error */
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{
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free( buffer );
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return NULL;
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}
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}
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/* now try the default dlopen search path */
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if (!ret)
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ret = wine_dlopen( buffer + dll_path_maxlen + 1, RTLD_NOW, error, errorsize );
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free( buffer );
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return ret;
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}
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/* adjust an array of pointers to make them into RVAs */
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static inline void fixup_rva_ptrs( void *array, void *base, int count )
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{
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void **ptr = (void **)array;
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while (count--)
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{
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if (*ptr) *ptr = (void *)((char *)*ptr - (char *)base);
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ptr++;
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}
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}
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/* fixup RVAs in the resource directory */
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static void fixup_resources( IMAGE_RESOURCE_DIRECTORY *dir, char *root, void *base )
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{
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IMAGE_RESOURCE_DIRECTORY_ENTRY *entry;
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int i;
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entry = (IMAGE_RESOURCE_DIRECTORY_ENTRY *)(dir + 1);
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for (i = 0; i < dir->NumberOfNamedEntries + dir->NumberOfIdEntries; i++, entry++)
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{
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void *ptr = root + entry->u2.s3.OffsetToDirectory;
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if (entry->u2.s3.DataIsDirectory) fixup_resources( ptr, root, base );
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else
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{
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IMAGE_RESOURCE_DATA_ENTRY *data = ptr;
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fixup_rva_ptrs( &data->OffsetToData, base, 1 );
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}
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}
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}
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/* map a builtin dll in memory and fixup RVAs */
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static void *map_dll( const IMAGE_NT_HEADERS *nt_descr )
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{
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#ifdef HAVE_MMAP
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IMAGE_DATA_DIRECTORY *dir;
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IMAGE_DOS_HEADER *dos;
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IMAGE_NT_HEADERS *nt;
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IMAGE_SECTION_HEADER *sec;
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BYTE *addr, *code_start, *data_start;
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size_t page_size = getpagesize();
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int nb_sections = 2; /* code + data */
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size_t size = (sizeof(IMAGE_DOS_HEADER)
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+ sizeof(IMAGE_NT_HEADERS)
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+ nb_sections * sizeof(IMAGE_SECTION_HEADER));
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assert( size <= page_size );
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if (nt_descr->OptionalHeader.ImageBase)
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{
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addr = wine_anon_mmap( (void *)nt_descr->OptionalHeader.ImageBase,
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page_size, PROT_READ|PROT_WRITE, MAP_FIXED );
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if (addr != (BYTE *)nt_descr->OptionalHeader.ImageBase) return NULL;
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}
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else
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{
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/* this will leak memory; but it should never happen */
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addr = wine_anon_mmap( NULL, page_size, PROT_READ|PROT_WRITE, 0 );
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if (addr == (BYTE *)-1) return NULL;
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}
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dos = (IMAGE_DOS_HEADER *)addr;
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nt = (IMAGE_NT_HEADERS *)(dos + 1);
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sec = (IMAGE_SECTION_HEADER *)(nt + 1);
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code_start = addr + page_size;
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/* HACK! */
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data_start = code_start + page_size;
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/* Build the DOS and NT headers */
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dos->e_magic = IMAGE_DOS_SIGNATURE;
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dos->e_lfanew = sizeof(*dos);
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*nt = *nt_descr;
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nt->FileHeader.NumberOfSections = nb_sections;
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nt->OptionalHeader.SizeOfCode = data_start - code_start;
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nt->OptionalHeader.SizeOfInitializedData = 0;
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nt->OptionalHeader.SizeOfUninitializedData = 0;
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nt->OptionalHeader.ImageBase = (DWORD)addr;
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fixup_rva_ptrs( &nt->OptionalHeader.AddressOfEntryPoint, addr, 1 );
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/* Build the code section */
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strcpy( sec->Name, ".text" );
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sec->SizeOfRawData = data_start - code_start;
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sec->Misc.VirtualSize = sec->SizeOfRawData;
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sec->VirtualAddress = code_start - addr;
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sec->PointerToRawData = code_start - addr;
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sec->Characteristics = (IMAGE_SCN_CNT_CODE | IMAGE_SCN_MEM_EXECUTE | IMAGE_SCN_MEM_READ);
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sec++;
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/* Build the data section */
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strcpy( sec->Name, ".data" );
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sec->SizeOfRawData = 0;
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sec->Misc.VirtualSize = sec->SizeOfRawData;
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sec->VirtualAddress = data_start - addr;
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sec->PointerToRawData = data_start - addr;
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sec->Characteristics = (IMAGE_SCN_CNT_INITIALIZED_DATA |
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IMAGE_SCN_MEM_WRITE | IMAGE_SCN_MEM_READ);
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sec++;
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/* Build the import directory */
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dir = &nt->OptionalHeader.DataDirectory[IMAGE_FILE_IMPORT_DIRECTORY];
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if (dir->Size)
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{
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IMAGE_IMPORT_DESCRIPTOR *imports = (void *)dir->VirtualAddress;
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fixup_rva_ptrs( &dir->VirtualAddress, addr, 1 );
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/* we can fixup everything at once since we only have pointers and 0 values */
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fixup_rva_ptrs( imports, addr, dir->Size / sizeof(void*) );
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}
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/* Build the resource directory */
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dir = &nt->OptionalHeader.DataDirectory[IMAGE_FILE_RESOURCE_DIRECTORY];
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if (dir->Size)
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{
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void *ptr = (void *)dir->VirtualAddress;
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fixup_rva_ptrs( &dir->VirtualAddress, addr, 1 );
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fixup_resources( ptr, ptr, addr );
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}
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/* Build the export directory */
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dir = &nt->OptionalHeader.DataDirectory[IMAGE_FILE_EXPORT_DIRECTORY];
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if (dir->Size)
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{
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IMAGE_EXPORT_DIRECTORY *exports = (void *)dir->VirtualAddress;
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fixup_rva_ptrs( &dir->VirtualAddress, addr, 1 );
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fixup_rva_ptrs( (void *)exports->AddressOfFunctions, addr, exports->NumberOfFunctions );
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fixup_rva_ptrs( (void *)exports->AddressOfNames, addr, exports->NumberOfNames );
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fixup_rva_ptrs( &exports->Name, addr, 1 );
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fixup_rva_ptrs( &exports->AddressOfFunctions, addr, 1 );
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fixup_rva_ptrs( &exports->AddressOfNames, addr, 1 );
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fixup_rva_ptrs( &exports->AddressOfNameOrdinals, addr, 1 );
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}
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return addr;
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#else /* HAVE_MMAP */
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return NULL;
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#endif /* HAVE_MMAP */
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}
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/***********************************************************************
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* __wine_dll_register
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*
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* Register a built-in DLL descriptor.
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*/
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void __wine_dll_register( const IMAGE_NT_HEADERS *header, const char *filename )
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{
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if (load_dll_callback) load_dll_callback( map_dll(header), filename );
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else
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{
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if (!(header->FileHeader.Characteristics & IMAGE_FILE_DLL))
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main_exe = header;
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else
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{
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assert( nb_dlls < MAX_DLLS );
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builtin_dlls[nb_dlls].nt = header;
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builtin_dlls[nb_dlls].filename = filename;
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nb_dlls++;
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}
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}
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}
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/***********************************************************************
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* wine_dll_set_callback
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*
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* Set the callback function for dll loading, and call it
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* for all dlls that were implicitly loaded already.
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*/
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void wine_dll_set_callback( load_dll_callback_t load )
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{
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int i;
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load_dll_callback = load;
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for (i = 0; i < nb_dlls; i++)
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{
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const IMAGE_NT_HEADERS *nt = builtin_dlls[i].nt;
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if (!nt) continue;
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builtin_dlls[i].nt = NULL;
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load_dll_callback( map_dll(nt), builtin_dlls[i].filename );
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}
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nb_dlls = 0;
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if (main_exe) load_dll_callback( map_dll(main_exe), "" );
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}
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/***********************************************************************
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* wine_dll_load
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*
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* Load a builtin dll.
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*/
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void *wine_dll_load( const char *filename, char *error, int errorsize )
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{
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int i;
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/* callback must have been set already */
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assert( load_dll_callback );
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/* check if we have it in the list */
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/* this can happen when initializing pre-loaded dlls in wine_dll_set_callback */
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for (i = 0; i < nb_dlls; i++)
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{
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if (!builtin_dlls[i].nt) continue;
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if (!strcmp( builtin_dlls[i].filename, filename ))
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{
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const IMAGE_NT_HEADERS *nt = builtin_dlls[i].nt;
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builtin_dlls[i].nt = NULL;
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load_dll_callback( map_dll(nt), builtin_dlls[i].filename );
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return (void *)1;
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}
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}
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return dlopen_dll( filename, error, errorsize );
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}
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/***********************************************************************
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* wine_dll_unload
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*
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* Unload a builtin dll.
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*/
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void wine_dll_unload( void *handle )
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{
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if (handle != (void *)1)
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wine_dlclose( handle, NULL, 0 );
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}
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/***********************************************************************
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* wine_dll_load_main_exe
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*
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* Try to load the .so for the main exe, optionally searching for it in PATH.
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*/
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void *wine_dll_load_main_exe( const char *name, int search_path, char *error, int errorsize )
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{
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void *ret = NULL;
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const char *path = NULL;
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if (search_path) path = getenv( "PATH" );
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if (!path)
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{
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/* no path, try only the specified name */
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ret = wine_dlopen( name, RTLD_NOW, error, errorsize );
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}
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else
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{
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char buffer[128], *tmp = buffer;
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size_t namelen = strlen(name);
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size_t pathlen = strlen(path);
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if (namelen + pathlen + 2 > sizeof(buffer)) tmp = malloc( namelen + pathlen + 2 );
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if (tmp)
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{
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char *basename = tmp + pathlen;
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*basename = '/';
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strcpy( basename + 1, name );
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for (;;)
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{
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int len;
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const char *p = strchr( path, ':' );
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if (!p) p = path + strlen(path);
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if ((len = p - path) > 0)
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{
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memcpy( basename - len, path, len );
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if ((ret = wine_dlopen( basename - len, RTLD_NOW, error, errorsize ))) break;
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}
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if (!*p) break;
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path = p + 1;
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}
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if (tmp != buffer) free( tmp );
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}
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}
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return ret;
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}
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