Python idautils.XrefsFrom() Examples

def find_xrefs_from( self, func_ea ):
    
        xrefs = []

        for item in idautils.FuncItems( func_ea ):
            
            ALL_XREFS = 0
            for ref in idautils.XrefsFrom( item, ALL_XREFS ):
                    
                if ref.type not in XrefsFromFinder.XREF_TYPE2STR:
                    continue
                
                if ref.to in idautils.FuncItems( func_ea ):
                    continue
                
                disas = idc.GetDisasm( item )
                curr_xref = XrefFrom( item, ref.to, ref.type, disas )
                xrefs.append( curr_xref )
                
        return xrefs 

def get_custom_viewer_hint(self, view, place):
        try:
            tform = idaapi.get_current_tform()
            if idaapi.get_tform_type(tform) != idaapi.BWN_DISASM:
                return None

            curline = idaapi.get_custom_viewer_curline(view, True)
            
            # sometimes get_custom_viewer_place() returns [x, y] and sometimes [place_t, x, y].
            # we want the place_t.
            viewer_place = idaapi.get_custom_viewer_place(view, True)
            if len(viewer_place) != 3:
                return None

            _, x, y = viewer_place
            ea = place.toea()

            # "color" is a bit of misnomer: its the type of the symbol currently hinted
            color = get_color_at_char(curline, x)
            if color != idaapi.COLOR_ADDR:
                return None

            # grab the FAR references to code (not necessarilty a branch/call/jump by itself)
            far_code_references = [xref.to for xref in idautils.XrefsFrom(ea, ida_xref.XREF_FAR) 
                                   if idc.isCode(idc.GetFlags(xref.to))]
            if len(far_code_references) != 1:
                return None

            fva = far_code_references[0]

            # ensure its actually a function
            if not idaapi.get_func(fva):
                return None

            # this magic constant is the number of "important lines" to display by default.
            # the remaining lines get shown if you scroll down while the hint is displayed, revealing more lines.
            return render_function_hint(fva), DEFAULT_IMPORTANT_LINES_NUM
        except Exception as e:
            logger.warning('unexpected exception: %s. Get in touch with @williballenthin.', e, exc_info=True)
            return None 

def xrefs_from(self):
        """Xrefs from this line.

        :return: Xrefs as `sark.code.xref.Xref` objects.
        """
        return list(map(Xref, idautils.XrefsFrom(self.ea))) 

def get_xrefs_frm(ea):
    xref_set = set()
    for xref in idautils.XrefsFrom(ea, 1):
        xref_set.add(xref.to)
    return xref_set 

def graph_down(ea, path=set()):
    """
    Recursively collect all function calls.

    Copied with minor modifications from
    http://hooked-on-mnemonics.blogspot.com/2012/07/renaming-subroutine-blocks-and.html
    """
    path.add(ea)

    #
    # extract all the call instructions from the current function
    #

    call_instructions = []
    instruction_info = idaapi.insn_t()
    for address in idautils.FuncItems(ea):

        # decode the instruction
        if not idaapi.decode_insn(instruction_info, address):
            continue

        # check if this instruction is a call
        if not idaapi.is_call_insn(instruction_info):
            continue

        # save this address as a call instruction
        call_instructions.append(address)

    #
    # iterate through all the instructions in the target function (ea) and
    # inspect all the call instructions
    #

    for x in call_instructions:

        #  TODO
        for r in idautils.XrefsFrom(x, idaapi.XREF_FAR):
            #print(0x%08X" % h, "--calls-->", "0x%08X" % r.to)
            if not r.iscode:
                continue

            # get the function pointed at by this call
            func = idaapi.get_func(r.to)
            if not func:
                continue

            # ignore calls to imports / library calls / thunks
            if (func.flags & (idaapi.FUNC_THUNK | idaapi.FUNC_LIB)) != 0:
                continue

            #
            # if we have not traversed to the destination function that this
            # call references, recurse down to it to continue our traversal
            #

            if r.to not in path:
                graph_down(r.to, path)

    return path 

def getIvarTypeFromFunc(self, eh, va):
        if va in self.ivarSetters:
            return self.ivarSetters[va]
        elif va in self.notIvarSetters:
            return UNKNOWN
        addr = va
        endVa = idc.get_func_attr(va, idc.FUNCATTR_END)
        if endVa - va < 0x20:
            ivarVa = None
            while addr <= endVa:
                srcOpnd = idc.print_operand(addr, 1)
                # if ivar is the src op for an instruction, assume this function will return it
                if eh.arch == unicorn.UC_ARCH_ARM and "_OBJC_IVAR_$_" in srcOpnd:
                    oploc = idc.get_name_ea_simple(
                        srcOpnd[srcOpnd.find("_OBJC_IVAR_$_"):srcOpnd.find(" ")])
                    if oploc != idc.BADADDR:
                        ivarVa = oploc
                        break
                elif eh.arch == unicorn.UC_ARCH_ARM64:
                    for x in idautils.XrefsFrom(addr):
                        if (idc.get_segm_name(x.to) == "__objc_ivar" and
                                idc.get_name(x.to, idc.ida_name.GN_VISIBLE)[:13] == "_OBJC_IVAR_$_"):
                            ivarVa = x.to
                            break
                elif eh.arch == unicorn.UC_ARCH_X86:
                    if "_OBJC_IVAR_$_" in srcOpnd:
                        ivarVa = idc.get_operand_value(addr, 1)
                        break

                addr = idc.next_head(addr, idc.get_inf_attr(idc.INF_MAX_EA))

            if ivarVa:
                for x in idautils.XrefsTo(ivarVa):
                    if x.frm >= self.objcConst[0] and x.frm < self.objcConst[1]:
                        typeStr = eh.getIDBString(
                            eh.derefPtr(x.frm + eh.size_pointer * 2))
                        self.ivarSetters[va] = typeStr[2:-1]
                        logging.debug("%s is an ivar getter function, returning type %s" % (
                            eh.hexString(va), typeStr[2:-1]))
                        return typeStr[2:-1]
            else:
                logging.debug(
                    "%s determined not to be an ivar getter function", eh.hexString(va))
                self.notIvarSetters.append(va)
        else:
            logging.debug(
                "%s determined not to be an ivar getter function", eh.hexString(va))
            self.notIvarSetters.append(va)
        return UNKNOWN


    # returns class or sel name from IDA name