441 lines
13 KiB
C
441 lines
13 KiB
C
/*
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* 386-specific Win32 dll<->dll snooping functions
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*
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* Copyright 1998 Marcus Meissner
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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 <stdio.h>
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#include <string.h>
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#include "winternl.h"
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#include "snoop.h"
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#include "wine/debug.h"
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#include "wine/exception.h"
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#include "excpt.h"
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#include "ntdll_misc.h"
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WINE_DEFAULT_DEBUG_CHANNEL(snoop);
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WINE_DECLARE_DEBUG_CHANNEL(seh);
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static WINE_EXCEPTION_FILTER(page_fault)
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{
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if (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ||
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GetExceptionCode() == EXCEPTION_PRIV_INSTRUCTION)
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return EXCEPTION_EXECUTE_HANDLER;
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return EXCEPTION_CONTINUE_SEARCH;
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}
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extern const char **debug_snoop_excludelist;
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extern const char **debug_snoop_includelist;
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#ifdef __i386__
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extern void WINAPI SNOOP_Entry();
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extern void WINAPI SNOOP_Return();
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#include "pshpack1.h"
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typedef struct tagSNOOP_FUN {
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/* code part */
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BYTE lcall; /* 0xe8 call snoopentry (relative) */
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/* NOTE: If you move snoopentry OR nrofargs fix the relative offset
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* calculation!
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*/
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DWORD snoopentry; /* SNOOP_Entry relative */
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/* unreached */
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int nrofargs;
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FARPROC origfun;
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const char *name;
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} SNOOP_FUN;
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typedef struct tagSNOOP_DLL {
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HMODULE hmod;
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SNOOP_FUN *funs;
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DWORD ordbase;
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DWORD nrofordinals;
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struct tagSNOOP_DLL *next;
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char name[1];
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} SNOOP_DLL;
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typedef struct tagSNOOP_RETURNENTRY {
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/* code part */
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BYTE lcall; /* 0xe8 call snoopret relative*/
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/* NOTE: If you move snoopret OR origreturn fix the relative offset
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* calculation!
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*/
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DWORD snoopret; /* SNOOP_Ret relative */
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/* unreached */
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FARPROC origreturn;
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SNOOP_DLL *dll;
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DWORD ordinal;
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DWORD origESP;
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DWORD *args; /* saved args across a stdcall */
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} SNOOP_RETURNENTRY;
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typedef struct tagSNOOP_RETURNENTRIES {
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SNOOP_RETURNENTRY entry[4092/sizeof(SNOOP_RETURNENTRY)];
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struct tagSNOOP_RETURNENTRIES *next;
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} SNOOP_RETURNENTRIES;
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#include "poppack.h"
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static SNOOP_DLL *firstdll = NULL;
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static SNOOP_RETURNENTRIES *firstrets = NULL;
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/***********************************************************************
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* SNOOP_ShowDebugmsgSnoop
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*
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* Simple function to decide if a particular debugging message is
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* wanted.
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*/
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int SNOOP_ShowDebugmsgSnoop(const char *dll, int ord, const char *fname) {
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if(debug_snoop_excludelist || debug_snoop_includelist) {
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const char **listitem;
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char buf[80];
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int len, len2, itemlen, show;
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if(debug_snoop_excludelist) {
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show = 1;
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listitem = debug_snoop_excludelist;
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} else {
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show = 0;
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listitem = debug_snoop_includelist;
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}
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len = strlen(dll);
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assert(len < 64);
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sprintf(buf, "%s.%d", dll, ord);
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len2 = strlen(buf);
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for(; *listitem; listitem++) {
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itemlen = strlen(*listitem);
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if((itemlen == len && !strncasecmp(*listitem, buf, len)) ||
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(itemlen == len2 && !strncasecmp(*listitem, buf, len2)) ||
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!strcasecmp(*listitem, fname)) {
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show = !show;
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break;
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}
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}
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return show;
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}
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return 1;
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}
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void
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SNOOP_RegisterDLL(HMODULE hmod,LPCSTR name,DWORD ordbase,DWORD nrofordinals) {
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SNOOP_DLL **dll = &(firstdll);
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char *s;
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void *addr;
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SIZE_T size;
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TRACE("hmod=%p, name=%s, ordbase=%ld, nrofordinals=%ld\n",
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hmod, name, ordbase, nrofordinals);
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if (!TRACE_ON(snoop)) return;
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while (*dll) {
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if ((*dll)->hmod == hmod)
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{
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/* another dll, loaded at the same address */
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addr = (*dll)->funs;
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size = (*dll)->nrofordinals * sizeof(SNOOP_FUN);
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NtFreeVirtualMemory(GetCurrentProcess(), &addr, &size, MEM_RELEASE);
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break;
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}
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dll = &((*dll)->next);
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}
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*dll = RtlReAllocateHeap(ntdll_get_process_heap(),
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HEAP_ZERO_MEMORY, *dll,
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sizeof(SNOOP_DLL) + strlen(name));
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(*dll)->hmod = hmod;
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(*dll)->ordbase = ordbase;
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(*dll)->nrofordinals = nrofordinals;
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strcpy( (*dll)->name, name );
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if ((s=strrchr((*dll)->name,'.')))
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*s='\0';
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size = nrofordinals * sizeof(SNOOP_FUN);
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NtAllocateVirtualMemory(GetCurrentProcess(), &addr, NULL, &size,
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MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
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if (!addr) {
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RtlFreeHeap(ntdll_get_process_heap(),0,*dll);
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FIXME("out of memory\n");
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return;
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}
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(*dll)->funs = addr;
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memset((*dll)->funs,0,size);
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}
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FARPROC SNOOP_GetProcAddress( HMODULE hmod, IMAGE_EXPORT_DIRECTORY *exports, DWORD exp_size,
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FARPROC origfun, DWORD ordinal )
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{
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int i;
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const char *ename;
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WORD *ordinals;
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DWORD *names;
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SNOOP_DLL *dll = firstdll;
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SNOOP_FUN *fun;
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IMAGE_SECTION_HEADER *sec;
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if (!TRACE_ON(snoop)) return origfun;
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if (!*(LPBYTE)origfun) /* 0x00 is an imposs. opcode, poss. dataref. */
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return origfun;
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sec = RtlImageRvaToSection( RtlImageNtHeader(hmod), hmod, (char *)origfun - (char *)hmod );
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if (!sec || !(sec->Characteristics & IMAGE_SCN_CNT_CODE))
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return origfun; /* most likely a data reference */
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while (dll) {
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if (hmod == dll->hmod)
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break;
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dll=dll->next;
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}
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if (!dll) /* probably internal */
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return origfun;
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/* try to find a name for it */
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ename = NULL;
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names = (DWORD *)((char *)hmod + exports->AddressOfNames);
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ordinals = (WORD *)((char *)hmod + exports->AddressOfNameOrdinals);
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if (names) for (i = 0; i < exports->NumberOfNames; i++)
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{
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if (ordinals[i] == ordinal)
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{
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ename = (char *)hmod + names[i];
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break;
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}
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}
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if (!SNOOP_ShowDebugmsgSnoop(dll->name,ordinal,ename))
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return origfun;
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assert(ordinal < dll->nrofordinals);
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fun = dll->funs+ordinal;
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if (!fun->name)
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{
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fun->name = ename;
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fun->lcall = 0xe8;
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/* NOTE: origreturn struct member MUST come directly after snoopentry */
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fun->snoopentry = (char*)SNOOP_Entry-((char*)(&fun->nrofargs));
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fun->origfun = origfun;
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fun->nrofargs = -1;
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}
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return (FARPROC)&(fun->lcall);
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}
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static void SNOOP_PrintArg(DWORD x)
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{
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int i,nostring;
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DPRINTF("%08lx",x);
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if (!HIWORD(x) || TRACE_ON(seh)) return; /* trivial reject to avoid faults */
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__TRY
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{
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LPBYTE s=(LPBYTE)x;
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i=0;nostring=0;
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while (i<80) {
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if (s[i]==0) break;
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if (s[i]<0x20) {nostring=1;break;}
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if (s[i]>=0x80) {nostring=1;break;}
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i++;
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}
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if (!nostring && i > 5)
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DPRINTF(" %s",debugstr_an((LPSTR)x,i));
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else /* try unicode */
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{
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LPWSTR s=(LPWSTR)x;
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i=0;nostring=0;
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while (i<80) {
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if (s[i]==0) break;
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if (s[i]<0x20) {nostring=1;break;}
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if (s[i]>0x100) {nostring=1;break;}
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i++;
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}
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if (!nostring && i > 5) DPRINTF(" %s",debugstr_wn((LPWSTR)x,i));
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}
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}
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__EXCEPT(page_fault)
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{
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}
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__ENDTRY
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}
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#define CALLER1REF (*(DWORD*)context->Esp)
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void WINAPI SNOOP_DoEntry( CONTEXT86 *context )
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{
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DWORD ordinal=0,entry = context->Eip - 5;
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SNOOP_DLL *dll = firstdll;
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SNOOP_FUN *fun = NULL;
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SNOOP_RETURNENTRIES **rets = &firstrets;
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SNOOP_RETURNENTRY *ret;
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int i=0, max;
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while (dll) {
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if ( ((char*)entry>=(char*)dll->funs) &&
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((char*)entry<=(char*)(dll->funs+dll->nrofordinals))
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) {
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fun = (SNOOP_FUN*)entry;
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ordinal = fun-dll->funs;
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break;
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}
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dll=dll->next;
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}
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if (!dll) {
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FIXME("entrypoint 0x%08lx not found\n",entry);
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return; /* oops */
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}
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/* guess cdecl ... */
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if (fun->nrofargs<0) {
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/* Typical cdecl return frame is:
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* add esp, xxxxxxxx
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* which has (for xxxxxxxx up to 255 the opcode "83 C4 xx".
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* (after that 81 C2 xx xx xx xx)
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*/
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LPBYTE reteip = (LPBYTE)CALLER1REF;
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if (reteip) {
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if ((reteip[0]==0x83)&&(reteip[1]==0xc4))
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fun->nrofargs=reteip[2]/4;
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}
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}
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while (*rets) {
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for (i=0;i<sizeof((*rets)->entry)/sizeof((*rets)->entry[0]);i++)
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if (!(*rets)->entry[i].origreturn)
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break;
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if (i!=sizeof((*rets)->entry)/sizeof((*rets)->entry[0]))
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break;
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rets = &((*rets)->next);
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}
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if (!*rets) {
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SIZE_T size = 4096;
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VOID* addr;
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NtAllocateVirtualMemory(GetCurrentProcess(), &addr, NULL, &size,
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MEM_COMMIT | MEM_RESERVE,
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PAGE_EXECUTE_READWRITE);
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if (!addr) return;
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*rets = addr;
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memset(*rets,0,4096);
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i = 0; /* entry 0 is free */
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}
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ret = &((*rets)->entry[i]);
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ret->lcall = 0xe8;
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/* NOTE: origreturn struct member MUST come directly after snoopret */
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ret->snoopret = ((char*)SNOOP_Return)-(char*)(&ret->origreturn);
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ret->origreturn = (FARPROC)CALLER1REF;
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CALLER1REF = (DWORD)&ret->lcall;
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ret->dll = dll;
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ret->args = NULL;
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ret->ordinal = ordinal;
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ret->origESP = context->Esp;
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context->Eip = (DWORD)fun->origfun;
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if (fun->name) DPRINTF("%04lx:CALL %s.%s(",GetCurrentThreadId(),dll->name,fun->name);
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else DPRINTF("%04lx:CALL %s.%ld(",GetCurrentThreadId(),dll->name,dll->ordbase+ordinal);
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if (fun->nrofargs>0) {
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max = fun->nrofargs; if (max>16) max=16;
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for (i=0;i<max;i++)
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{
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SNOOP_PrintArg(*(DWORD*)(context->Esp + 4 + sizeof(DWORD)*i));
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if (i<fun->nrofargs-1) DPRINTF(",");
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}
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if (max!=fun->nrofargs)
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DPRINTF(" ...");
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} else if (fun->nrofargs<0) {
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DPRINTF("<unknown, check return>");
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ret->args = RtlAllocateHeap(ntdll_get_process_heap(),
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0,16*sizeof(DWORD));
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memcpy(ret->args,(LPBYTE)(context->Esp + 4),sizeof(DWORD)*16);
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}
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DPRINTF(") ret=%08lx\n",(DWORD)ret->origreturn);
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}
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void WINAPI SNOOP_DoReturn( CONTEXT86 *context )
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{
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SNOOP_RETURNENTRY *ret = (SNOOP_RETURNENTRY*)(context->Eip - 5);
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SNOOP_FUN *fun = &ret->dll->funs[ret->ordinal];
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/* We haven't found out the nrofargs yet. If we called a cdecl
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* function it is too late anyway and we can just set '0' (which
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* will be the difference between orig and current ESP
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* If stdcall -> everything ok.
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*/
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if (ret->dll->funs[ret->ordinal].nrofargs<0)
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ret->dll->funs[ret->ordinal].nrofargs=(context->Esp - ret->origESP-4)/4;
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context->Eip = (DWORD)ret->origreturn;
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if (ret->args) {
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int i,max;
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if (fun->name)
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DPRINTF("%04lx:RET %s.%s(", GetCurrentThreadId(), ret->dll->name, fun->name);
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else
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DPRINTF("%04lx:RET %s.%ld(", GetCurrentThreadId(),
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ret->dll->name,ret->dll->ordbase+ret->ordinal);
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max = fun->nrofargs;
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if (max>16) max=16;
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for (i=0;i<max;i++)
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{
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SNOOP_PrintArg(ret->args[i]);
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if (i<max-1) DPRINTF(",");
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}
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DPRINTF(") retval=%08lx ret=%08lx\n",
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context->Eax,(DWORD)ret->origreturn );
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RtlFreeHeap(ntdll_get_process_heap(),0,ret->args);
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ret->args = NULL;
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}
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else
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{
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if (fun->name)
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DPRINTF("%04lx:RET %s.%s() retval=%08lx ret=%08lx\n",
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GetCurrentThreadId(),
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ret->dll->name, fun->name, context->Eax, (DWORD)ret->origreturn);
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else
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DPRINTF("%04lx:RET %s.%ld() retval=%08lx ret=%08lx\n",
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GetCurrentThreadId(),
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ret->dll->name,ret->dll->ordbase+ret->ordinal,
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context->Eax, (DWORD)ret->origreturn);
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}
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ret->origreturn = NULL; /* mark as empty */
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}
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/* assembly wrappers that save the context */
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__ASM_GLOBAL_FUNC( SNOOP_Entry,
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"call " __ASM_NAME("__wine_call_from_32_regs") "\n\t"
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".long " __ASM_NAME("SNOOP_DoEntry") ",0" );
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__ASM_GLOBAL_FUNC( SNOOP_Return,
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"call " __ASM_NAME("__wine_call_from_32_regs") "\n\t"
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".long " __ASM_NAME("SNOOP_DoReturn") ",0" );
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#else /* !__i386__ */
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void SNOOP_RegisterDLL(HMODULE hmod,LPCSTR name,DWORD nrofordinals, DWORD dw) {
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if (!TRACE_ON(snoop)) return;
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FIXME("snooping works only on i386 for now.\n");
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}
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FARPROC SNOOP_GetProcAddress( HMODULE hmod, IMAGE_EXPORT_DIRECTORY *exports, DWORD exp_size,
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FARPROC origfun, DWORD ordinal )
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{
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return origfun;
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}
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#endif /* !__i386__ */
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