385 lines
9.8 KiB
C
385 lines
9.8 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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#include <assert.h>
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#include <string.h>
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#include "winbase.h"
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#include "winnt.h"
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#include "heap.h"
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#include "builtin32.h"
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#include "snoop.h"
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#include "neexe.h"
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#include "peexe.h"
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#include "selectors.h"
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#include "stackframe.h"
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#include "debugstr.h"
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#include "debugtools.h"
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DEFAULT_DEBUG_CHANNEL(snoop)
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char **debug_snoop_excludelist = NULL, **debug_snoop_includelist = NULL;
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extern void SNOOP_Entry();
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extern void SNOOP_Return();
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#ifdef __i386__
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#ifdef NEED_UNDERSCORE_PREFIX
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# define PREFIX "_"
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#else
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# define PREFIX
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#endif
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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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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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LPCSTR name;
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int nrofordinals;
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struct tagSNOOP_DLL *next;
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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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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 && !strncmp(*listitem, buf, len)) ||
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(itemlen == len2 && !strncmp(*listitem, buf, len2)) ||
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!strcmp(*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 nrofordinals) {
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SNOOP_DLL **dll = &(firstdll);
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char *s;
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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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return; /* already registered */
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dll = &((*dll)->next);
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}
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*dll = (SNOOP_DLL*)HeapAlloc(SystemHeap,HEAP_ZERO_MEMORY,sizeof(SNOOP_DLL));
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(*dll)->next = NULL;
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(*dll)->hmod = hmod;
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(*dll)->nrofordinals = nrofordinals;
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(*dll)->name = HEAP_strdupA(SystemHeap,0,name);
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if ((s=strrchr((*dll)->name,'.')))
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*s='\0';
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(*dll)->funs = VirtualAlloc(NULL,nrofordinals*sizeof(SNOOP_FUN),MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
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memset((*dll)->funs,0,nrofordinals*sizeof(SNOOP_FUN));
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if (!(*dll)->funs) {
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HeapFree(SystemHeap,0,*dll);
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FIXME("out of memory\n");
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return;
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}
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}
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FARPROC
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SNOOP_GetProcAddress(HMODULE hmod,LPCSTR name,DWORD ordinal,FARPROC origfun) {
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SNOOP_DLL *dll = firstdll;
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SNOOP_FUN *fun;
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int j;
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IMAGE_SECTION_HEADER *pe_seg = PE_SECTIONS(hmod);
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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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for (j=0;j<PE_HEADER(hmod)->FileHeader.NumberOfSections;j++)
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/* 0x42 is special ELF loader tag */
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if ((pe_seg[j].VirtualAddress==0x42) ||
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(((DWORD)origfun-hmod>=pe_seg[j].VirtualAddress)&&
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((DWORD)origfun-hmod <pe_seg[j].VirtualAddress+
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pe_seg[j].SizeOfRawData
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))
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)
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break;
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/* If we looked through all sections (and didn't find one)
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* or if the sectionname contains "data", we return the
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* original function since it is most likely a datareference.
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*/
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if ( (j==PE_HEADER(hmod)->FileHeader.NumberOfSections) ||
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(strstr(pe_seg[j].Name,"data")) ||
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!(pe_seg[j].Characteristics & IMAGE_SCN_CNT_CODE)
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)
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return origfun;
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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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if (!SNOOP_ShowDebugmsgSnoop(dll->name,ordinal,name))
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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) fun->name = HEAP_strdupA(SystemHeap,0,name);
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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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return (FARPROC)&(fun->lcall);
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}
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static char*
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SNOOP_PrintArg(DWORD x) {
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static char buf[200];
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int i,nostring;
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MEMORY_BASIC_INFORMATION mbi;
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if ( !HIWORD(x) ||
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!VirtualQuery((LPVOID)x,&mbi,sizeof(mbi)) ||
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!mbi.Type
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) {
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sprintf(buf,"%08lx",x);
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return buf;
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}
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i=0;nostring=0;
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if (!IsBadStringPtrA((LPSTR)x,80)) {
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while (i<80) {
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LPBYTE s=(LPBYTE)x;
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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) {
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if (i>5) {
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sprintf(buf,"%08lx \"",x);
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strncat(buf,(LPSTR)x,198-strlen(buf)-2);
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strcat(buf,"\"");
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return buf;
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}
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}
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}
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i=0;nostring=0;
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if (!IsBadStringPtrW((LPWSTR)x,80)) {
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while (i<80) {
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LPWSTR s=(LPWSTR)x;
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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) {
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if (i>5) {
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sprintf(buf,"%08lx L",x);
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strcat(buf,debugstr_wn((LPWSTR)x,198-strlen(buf)-2));
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return buf;
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}
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}
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}
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sprintf(buf,"%08lx",x);
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return buf;
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}
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#define CALLER1REF (*(DWORD*)ESP_reg(context))
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void WINAPI REGS_FUNC(SNOOP_Entry)( CONTEXT *context )
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{
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DWORD ordinal=0,entry = EIP_reg(context)-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,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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*rets = VirtualAlloc(NULL,4096,MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
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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 = ESP_reg(context);
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EIP_reg(context)= (DWORD)fun->origfun;
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DPRINTF("Call %s.%ld: %s(",dll->name,ordinal,fun->name);
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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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DPRINTF("%s%s",SNOOP_PrintArg(*(DWORD*)(ESP_reg(context)+4+sizeof(DWORD)*i)),(i<fun->nrofargs-1)?",":"");
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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 = HeapAlloc(SystemHeap,0,16*sizeof(DWORD));
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memcpy(ret->args,(LPBYTE)(ESP_reg(context)+4),sizeof(DWORD)*16);
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}
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DPRINTF(") ret=%08lx fs=%04lx\n",(DWORD)ret->origreturn,FS_reg(context));
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}
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void WINAPI REGS_FUNC(SNOOP_Return)( CONTEXT *context )
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{
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SNOOP_RETURNENTRY *ret = (SNOOP_RETURNENTRY*)(EIP_reg(context)-5);
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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=(ESP_reg(context)-ret->origESP-4)/4;
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EIP_reg(context) = (DWORD)ret->origreturn;
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if (ret->args) {
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int i,max;
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DPRINTF("Ret %s.%ld: %s(",ret->dll->name,ret->ordinal,ret->dll->funs[ret->ordinal].name);
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max = ret->dll->funs[ret->ordinal].nrofargs;
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if (max>16) max=16;
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for (i=0;i<max;i++)
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DPRINTF("%s%s",SNOOP_PrintArg(ret->args[i]),(i<max-1)?",":"");
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DPRINTF(") retval = %08lx ret=%08lx fs=%04lx\n",
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EAX_reg(context),(DWORD)ret->origreturn,FS_reg(context)
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);
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HeapFree(SystemHeap,0,ret->args);
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ret->args = NULL;
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} else
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DPRINTF("Ret %s.%ld: %s() retval = %08lx ret=%08lx fs=%04lx\n",
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ret->dll->name,ret->ordinal,ret->dll->funs[ret->ordinal].name,
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EAX_reg(context),(DWORD)ret->origreturn,FS_reg(context)
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);
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ret->origreturn = NULL; /* mark as empty */
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}
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#else /* !__i386__ */
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void SNOOP_RegisterDLL(HMODULE hmod,LPCSTR name,DWORD nrofordinals) {
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FIXME("snooping works only on i386 for now.\n");
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return;
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}
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FARPROC SNOOP_GetProcAddress(HMODULE hmod,LPCSTR name,DWORD ordinal,FARPROC origfun) {
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return origfun;
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}
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void WINAPI REGS_FUNC(SNOOP_Entry)( CONTEXT *context )
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{
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}
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void WINAPI REGS_FUNC(SNOOP_Return)( CONTEXT *context )
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{
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}
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#endif /* !__i386__ */
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