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Sweden-Number/relay32/snoop.c

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/*
* 386-specific Win32 dll<->dll snooping functions
*
* Copyright 1998 Marcus Meissner
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include "wine/port.h"
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include "winbase.h"
#include "winnt.h"
#include "ntddk.h"
#include "snoop.h"
#include "stackframe.h"
#include "wine/debug.h"
#include "wine/exception.h"
#include "msvcrt/excpt.h"
WINE_DEFAULT_DEBUG_CHANNEL(snoop);
static WINE_EXCEPTION_FILTER(page_fault)
{
if (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ||
GetExceptionCode() == EXCEPTION_PRIV_INSTRUCTION)
return EXCEPTION_EXECUTE_HANDLER;
return EXCEPTION_CONTINUE_SEARCH;
}
extern const char **debug_snoop_excludelist;
extern const char **debug_snoop_includelist;
#ifdef __i386__
extern void WINAPI SNOOP_Entry();
extern void WINAPI SNOOP_Return();
#include "pshpack1.h"
typedef struct tagSNOOP_FUN {
/* code part */
BYTE lcall; /* 0xe8 call snoopentry (relative) */
/* NOTE: If you move snoopentry OR nrofargs fix the relative offset
* calculation!
*/
DWORD snoopentry; /* SNOOP_Entry relative */
/* unreached */
int nrofargs;
FARPROC origfun;
char *name;
} SNOOP_FUN;
typedef struct tagSNOOP_DLL {
HMODULE hmod;
SNOOP_FUN *funs;
DWORD ordbase;
DWORD nrofordinals;
struct tagSNOOP_DLL *next;
char name[1];
} SNOOP_DLL;
typedef struct tagSNOOP_RETURNENTRY {
/* code part */
BYTE lcall; /* 0xe8 call snoopret relative*/
/* NOTE: If you move snoopret OR origreturn fix the relative offset
* calculation!
*/
DWORD snoopret; /* SNOOP_Ret relative */
/* unreached */
FARPROC origreturn;
SNOOP_DLL *dll;
DWORD ordinal;
DWORD origESP;
DWORD *args; /* saved args across a stdcall */
} SNOOP_RETURNENTRY;
typedef struct tagSNOOP_RETURNENTRIES {
SNOOP_RETURNENTRY entry[4092/sizeof(SNOOP_RETURNENTRY)];
struct tagSNOOP_RETURNENTRIES *next;
} SNOOP_RETURNENTRIES;
#include "poppack.h"
static SNOOP_DLL *firstdll = NULL;
static SNOOP_RETURNENTRIES *firstrets = NULL;
/***********************************************************************
* SNOOP_ShowDebugmsgSnoop
*
* Simple function to decide if a particular debugging message is
* wanted.
*/
int SNOOP_ShowDebugmsgSnoop(const char *dll, int ord, const char *fname) {
if(debug_snoop_excludelist || debug_snoop_includelist) {
const char **listitem;
char buf[80];
int len, len2, itemlen, show;
if(debug_snoop_excludelist) {
show = 1;
listitem = debug_snoop_excludelist;
} else {
show = 0;
listitem = debug_snoop_includelist;
}
len = strlen(dll);
assert(len < 64);
sprintf(buf, "%s.%d", dll, ord);
len2 = strlen(buf);
for(; *listitem; listitem++) {
itemlen = strlen(*listitem);
if((itemlen == len && !strncasecmp(*listitem, buf, len)) ||
(itemlen == len2 && !strncasecmp(*listitem, buf, len2)) ||
!strcasecmp(*listitem, fname)) {
show = !show;
break;
}
}
return show;
}
return 1;
}
void
SNOOP_RegisterDLL(HMODULE hmod,LPCSTR name,DWORD ordbase,DWORD nrofordinals) {
SNOOP_DLL **dll = &(firstdll);
char *s;
TRACE("hmod=%x, name=%s, ordbase=%ld, nrofordinals=%ld\n",
hmod, name, ordbase, nrofordinals);
if (!TRACE_ON(snoop)) return;
while (*dll) {
if ((*dll)->hmod == hmod)
{
/* another dll, loaded at the same address */
VirtualFree((*dll)->funs, (*dll)->nrofordinals*sizeof(SNOOP_FUN), MEM_RELEASE);
break;
}
dll = &((*dll)->next);
}
*dll = HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, *dll, sizeof(SNOOP_DLL)+strlen(name));
(*dll)->hmod = hmod;
(*dll)->ordbase = ordbase;
(*dll)->nrofordinals = nrofordinals;
strcpy( (*dll)->name, name );
if ((s=strrchr((*dll)->name,'.')))
*s='\0';
(*dll)->funs = VirtualAlloc(NULL,nrofordinals*sizeof(SNOOP_FUN),MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
memset((*dll)->funs,0,nrofordinals*sizeof(SNOOP_FUN));
if (!(*dll)->funs) {
HeapFree(GetProcessHeap(),0,*dll);
FIXME("out of memory\n");
return;
}
}
FARPROC
SNOOP_GetProcAddress(HMODULE hmod,LPCSTR name,DWORD ordinal,FARPROC origfun) {
SNOOP_DLL *dll = firstdll;
SNOOP_FUN *fun;
IMAGE_SECTION_HEADER *sec;
if (!TRACE_ON(snoop)) return origfun;
if (!*(LPBYTE)origfun) /* 0x00 is an imposs. opcode, poss. dataref. */
return origfun;
sec = RtlImageRvaToSection( RtlImageNtHeader(hmod), hmod, (char *)origfun - (char *)hmod );
if (!sec || !(sec->Characteristics & IMAGE_SCN_CNT_CODE))
return origfun; /* most likely a data reference */
while (dll) {
if (hmod == dll->hmod)
break;
dll=dll->next;
}
if (!dll) /* probably internal */
return origfun;
if (!SNOOP_ShowDebugmsgSnoop(dll->name,ordinal,name))
return origfun;
assert(ordinal < dll->nrofordinals);
fun = dll->funs+ordinal;
if (!fun->name)
{
fun->name = HeapAlloc(GetProcessHeap(),0,strlen(name)+1);
strcpy( fun->name, name );
fun->lcall = 0xe8;
/* NOTE: origreturn struct member MUST come directly after snoopentry */
fun->snoopentry = (char*)SNOOP_Entry-((char*)(&fun->nrofargs));
fun->origfun = origfun;
fun->nrofargs = -1;
}
return (FARPROC)&(fun->lcall);
}
static void SNOOP_PrintArg(DWORD x)
{
int i,nostring;
DPRINTF("%08lx",x);
if ( !HIWORD(x) ) return; /* trivial reject to avoid faults */
__TRY
{
LPBYTE s=(LPBYTE)x;
i=0;nostring=0;
while (i<80) {
if (s[i]==0) break;
if (s[i]<0x20) {nostring=1;break;}
if (s[i]>=0x80) {nostring=1;break;}
i++;
}
if (!nostring && i > 5)
DPRINTF(" %s",debugstr_an((LPSTR)x,i));
else /* try unicode */
{
LPWSTR s=(LPWSTR)x;
i=0;nostring=0;
while (i<80) {
if (s[i]==0) break;
if (s[i]<0x20) {nostring=1;break;}
if (s[i]>0x100) {nostring=1;break;}
i++;
}
if (!nostring && i > 5) DPRINTF(" %s",debugstr_wn((LPWSTR)x,i));
}
}
__EXCEPT(page_fault)
{
}
__ENDTRY
}
#define CALLER1REF (*(DWORD*)context->Esp)
void WINAPI SNOOP_DoEntry( CONTEXT86 *context )
{
DWORD ordinal=0,entry = context->Eip - 5;
SNOOP_DLL *dll = firstdll;
SNOOP_FUN *fun = NULL;
SNOOP_RETURNENTRIES **rets = &firstrets;
SNOOP_RETURNENTRY *ret;
int i=0, max;
while (dll) {
if ( ((char*)entry>=(char*)dll->funs) &&
((char*)entry<=(char*)(dll->funs+dll->nrofordinals))
) {
fun = (SNOOP_FUN*)entry;
ordinal = fun-dll->funs;
break;
}
dll=dll->next;
}
if (!dll) {
FIXME("entrypoint 0x%08lx not found\n",entry);
return; /* oops */
}
/* guess cdecl ... */
if (fun->nrofargs<0) {
/* Typical cdecl return frame is:
* add esp, xxxxxxxx
* which has (for xxxxxxxx up to 255 the opcode "83 C4 xx".
* (after that 81 C2 xx xx xx xx)
*/
LPBYTE reteip = (LPBYTE)CALLER1REF;
if (reteip) {
if ((reteip[0]==0x83)&&(reteip[1]==0xc4))
fun->nrofargs=reteip[2]/4;
}
}
while (*rets) {
for (i=0;i<sizeof((*rets)->entry)/sizeof((*rets)->entry[0]);i++)
if (!(*rets)->entry[i].origreturn)
break;
if (i!=sizeof((*rets)->entry)/sizeof((*rets)->entry[0]))
break;
rets = &((*rets)->next);
}
if (!*rets) {
*rets = VirtualAlloc(NULL,4096,MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
memset(*rets,0,4096);
i = 0; /* entry 0 is free */
}
ret = &((*rets)->entry[i]);
ret->lcall = 0xe8;
/* NOTE: origreturn struct member MUST come directly after snoopret */
ret->snoopret = ((char*)SNOOP_Return)-(char*)(&ret->origreturn);
ret->origreturn = (FARPROC)CALLER1REF;
CALLER1REF = (DWORD)&ret->lcall;
ret->dll = dll;
ret->args = NULL;
ret->ordinal = ordinal;
ret->origESP = context->Esp;
context->Eip = (DWORD)fun->origfun;
DPRINTF("%08lx:CALL %s.%ld: %s(",GetCurrentThreadId(),dll->name,dll->ordbase+ordinal,fun->name);
if (fun->nrofargs>0) {
max = fun->nrofargs; if (max>16) max=16;
for (i=0;i<max;i++)
{
SNOOP_PrintArg(*(DWORD*)(context->Esp + 4 + sizeof(DWORD)*i));
if (i<fun->nrofargs-1) DPRINTF(",");
}
if (max!=fun->nrofargs)
DPRINTF(" ...");
} else if (fun->nrofargs<0) {
DPRINTF("<unknown, check return>");
ret->args = HeapAlloc(GetProcessHeap(),0,16*sizeof(DWORD));
memcpy(ret->args,(LPBYTE)(context->Esp + 4),sizeof(DWORD)*16);
}
DPRINTF(") ret=%08lx\n",(DWORD)ret->origreturn);
}
void WINAPI SNOOP_DoReturn( CONTEXT86 *context )
{
SNOOP_RETURNENTRY *ret = (SNOOP_RETURNENTRY*)(context->Eip - 5);
/* We haven't found out the nrofargs yet. If we called a cdecl
* function it is too late anyway and we can just set '0' (which
* will be the difference between orig and current ESP
* If stdcall -> everything ok.
*/
if (ret->dll->funs[ret->ordinal].nrofargs<0)
ret->dll->funs[ret->ordinal].nrofargs=(context->Esp - ret->origESP-4)/4;
context->Eip = (DWORD)ret->origreturn;
if (ret->args) {
int i,max;
DPRINTF("%08lx:RET %s.%ld: %s(",
GetCurrentThreadId(),
ret->dll->name,ret->dll->ordbase+ret->ordinal,ret->dll->funs[ret->ordinal].name);
max = ret->dll->funs[ret->ordinal].nrofargs;
if (max>16) max=16;
for (i=0;i<max;i++)
{
SNOOP_PrintArg(ret->args[i]);
if (i<max-1) DPRINTF(",");
}
DPRINTF(") retval = %08lx ret=%08lx\n",
context->Eax,(DWORD)ret->origreturn );
HeapFree(GetProcessHeap(),0,ret->args);
ret->args = NULL;
} else
DPRINTF("%08lx:RET %s.%ld: %s() retval = %08lx ret=%08lx\n",
GetCurrentThreadId(),
ret->dll->name,ret->dll->ordbase+ret->ordinal,ret->dll->funs[ret->ordinal].name,
context->Eax, (DWORD)ret->origreturn);
ret->origreturn = NULL; /* mark as empty */
}
/* assembly wrappers that save the context */
__ASM_GLOBAL_FUNC( SNOOP_Entry,
"call " __ASM_NAME("__wine_call_from_32_regs") "\n\t"
".long " __ASM_NAME("SNOOP_DoEntry") ",0" );
__ASM_GLOBAL_FUNC( SNOOP_Return,
"call " __ASM_NAME("__wine_call_from_32_regs") "\n\t"
".long " __ASM_NAME("SNOOP_DoReturn") ",0" );
#else /* !__i386__ */
void SNOOP_RegisterDLL(HMODULE hmod,LPCSTR name,DWORD nrofordinals, DWORD dw) {
if (!TRACE_ON(snoop)) return;
FIXME("snooping works only on i386 for now.\n");
}
FARPROC SNOOP_GetProcAddress(HMODULE hmod,LPCSTR name,DWORD ordinal,FARPROC origfun) {
return origfun;
}
#endif /* !__i386__ */
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