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Sweden-Number/relay32/snoop.c

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/*
* 386-specific Win32 dll<->dll snooping functions
*
* Copyright 1998 Marcus Meissner
*/
#include "config.h"
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include "winbase.h"
#include "winnt.h"
#include "heap.h"
#include "snoop.h"
#include "selectors.h"
#include "stackframe.h"
#include "debugtools.h"
#include "wine/exception.h"
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;
}
char **debug_snoop_excludelist = NULL, **debug_snoop_includelist = NULL;
#ifdef __i386__
extern void WINAPI SNOOP_Entry();
extern void WINAPI SNOOP_Return();
#ifdef NEED_UNDERSCORE_PREFIX
# define PREFIX "_"
#else
# define PREFIX
#endif
#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;
LPCSTR name;
DWORD nrofordinals;
struct tagSNOOP_DLL *next;
} 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) {
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 && !strncmp(*listitem, buf, len)) ||
(itemlen == len2 && !strncmp(*listitem, buf, len2)) ||
!strcmp(*listitem, fname)) {
show = !show;
break;
}
}
return show;
}
return 1;
}
void
SNOOP_RegisterDLL(HMODULE hmod,LPCSTR name,DWORD nrofordinals) {
SNOOP_DLL **dll = &(firstdll);
char *s;
if (!TRACE_ON(snoop)) return;
while (*dll) {
if ((*dll)->hmod == hmod)
return; /* already registered */
dll = &((*dll)->next);
}
*dll = (SNOOP_DLL*)HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,sizeof(SNOOP_DLL));
(*dll)->next = NULL;
(*dll)->hmod = hmod;
(*dll)->nrofordinals = nrofordinals;
(*dll)->name = HEAP_strdupA(GetProcessHeap(),0,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;
int j;
IMAGE_SECTION_HEADER *pe_seg = PE_SECTIONS(hmod);
if (!TRACE_ON(snoop)) return origfun;
if (!*(LPBYTE)origfun) /* 0x00 is an imposs. opcode, poss. dataref. */
return origfun;
for (j=0;j<PE_HEADER(hmod)->FileHeader.NumberOfSections;j++)
/* 0x42 is special ELF loader tag */
if ((pe_seg[j].VirtualAddress==0x42) ||
(((DWORD)origfun-hmod>=pe_seg[j].VirtualAddress)&&
((DWORD)origfun-hmod <pe_seg[j].VirtualAddress+
pe_seg[j].SizeOfRawData
))
)
break;
/* If we looked through all sections (and didn't find one)
* or if the sectionname contains "data", we return the
* original function since it is most likely a datareference.
*/
if ( (j==PE_HEADER(hmod)->FileHeader.NumberOfSections) ||
(strstr(pe_seg[j].Name,"data")) ||
!(pe_seg[j].Characteristics & IMAGE_SCN_CNT_CODE)
)
return origfun;
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 = HEAP_strdupA(GetProcessHeap(),0,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 char*
SNOOP_PrintArg(DWORD x) {
static char buf[200];
int i,nostring;
char * volatile ret=0;
if ( !HIWORD(x) ) { /* trivial reject to avoid faults */
sprintf(buf,"%08lx",x);
return buf;
}
__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) {
if (i>5) {
snprintf(buf,sizeof(buf),"%08lx %s",x,debugstr_an((LPSTR)x,sizeof(buf)-10));
ret=buf;
}
}
}
__EXCEPT(page_fault){}
__ENDTRY
if (ret)
return ret;
__TRY{
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) {
if (i>5) {
snprintf(buf,sizeof(buf),"%08lx %s",x,debugstr_wn((LPWSTR)x,sizeof(buf)-10));
ret=buf;
}
}
}
__EXCEPT(page_fault){}
__ENDTRY
if (ret)
return ret;
sprintf(buf,"%08lx",x);
return buf;
}
#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("CALL %s.%ld: %s(",dll->name,ordinal,fun->name);
if (fun->nrofargs>0) {
max = fun->nrofargs; if (max>16) max=16;
for (i=0;i<max;i++)
DPRINTF("%s%s",SNOOP_PrintArg(*(DWORD*)(context->Esp + 4 + sizeof(DWORD)*i)),(i<fun->nrofargs-1)?",":"");
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 fs=%04lx\n",(DWORD)ret->origreturn,context->SegFs);
}
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("RET %s.%ld: %s(",ret->dll->name,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++)
DPRINTF("%s%s",SNOOP_PrintArg(ret->args[i]),(i<max-1)?",":"");
DPRINTF(") retval = %08lx ret=%08lx fs=%04lx\n",
context->Eax,(DWORD)ret->origreturn,context->SegFs );
HeapFree(GetProcessHeap(),0,ret->args);
ret->args = NULL;
} else
DPRINTF("RET %s.%ld: %s() retval = %08lx ret=%08lx fs=%04lx\n",
ret->dll->name,ret->ordinal,ret->dll->funs[ret->ordinal].name,
context->Eax,(DWORD)ret->origreturn,context->SegFs );
ret->origreturn = NULL; /* mark as empty */
}
/* assembly wrappers that save the context */
__ASM_GLOBAL_FUNC( SNOOP_Entry,
"call " __ASM_NAME("CALL32_Regs") "\n\t"
".long " __ASM_NAME("SNOOP_DoEntry") ",0" );
__ASM_GLOBAL_FUNC( SNOOP_Return,
"call " __ASM_NAME("CALL32_Regs") "\n\t"
".long " __ASM_NAME("SNOOP_DoReturn") ",0" );
#else /* !__i386__ */
void SNOOP_RegisterDLL(HMODULE hmod,LPCSTR name,DWORD nrofordinals) {
FIXME("snooping works only on i386 for now.\n");
return;
}
FARPROC SNOOP_GetProcAddress(HMODULE hmod,LPCSTR name,DWORD ordinal,FARPROC origfun) {
return origfun;
}
#endif /* !__i386__ */
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