浅谈javascript函数劫持(二)
// js编码
function jsEncode(s) {
s = s.replace(/\\/g, "\\\\");
s = s.replace(/\n/g, "");
s = s.replace(/\"/g, "\\\"");
s = s.replace(/\'/g, "\\\'");
return s;
}
//--------------------------------------------------------------//
// 命令行窗口工具
//--------------------------------------------------------------//
function Console(parentNode, processInputProc) {
// 窗口
var panel = document.createElement("div");
panel.style.width = "250px";
panel.style.height = "250px";
panel.style.borderColor = "#666666";
panel.style.borderWidth = "1px";
panel.style.backgroundColor = "#ffffff";
panel.style.borderStyle = "solid";
panel.style.position = "absolute";
panel.style.zIndex = 100;
parentNode.appendChild(panel);
// 标题栏
var title = document.createElement("div");
title.style.width = "250px";
title.style.height = "15px";
title.style.backgroundColor = "#dddddd";
title.style.fontSize = "12px";
title.style.fontFamily = "verdana,tahoma";
panel.appendChild(title);
// 标题栏拖动窗口功能
var isDragging = false;
var startPos = new Position(panel.offsetLeft, panel.offsetTop);
var startMousePos = new Position(0, 0);
title.onmouseover = function(evt) {
this.style.cursor = "pointer";
}
title.onmousedown = function(evt) {
if (isDragging == true) {
return;
}
var event = evt || window.event;
startMousePos.x = event.clientX;
startMousePos.y = event.clientY;
isDragging = true;
}
title.onmousemove = function(evt) {
if (isDragging == false) {
return;
}
activateWindow();
var event = evt || window.event;
panel.style.left = (event.clientX - startMousePos.x) + startPos.x +
"px";
panel.style.top = (event.clientY - startMousePos.y) + startPos.y +
"px";
}
title.onmouseup = function(evt) {
if (isDragging == false) {
return;
}
var event = evt || window.event;
startPos.x = (event.clientX - startMousePos.x) + startPos.x;
panel.style.left = startPos.x + "px";
startPos.y = (event.clientY - startMousePos.y) + startPos.y;
panel.style.top = startPos.y + "px";
isDragging = false;
}
// 关闭窗口功能
var closeButton = document.createElement("div");
closeButton.style.width = "13px";
closeButton.style.height = "13px";
closeButton.style.backgroundColor = "#ffffff";
closeButton.style.styleFloat = closeButton.style.cssFloat = "left";
closeButton.style.fontSize = "12px";
closeButton.style.borderWidth = "1px";
closeButton.style.borderColor = "#999999";
closeButton.style.borderStyle = "solid";
closeButton.style.paddingButton = "2px";
closeButton.innerHTML = "<div style=\"margin-top: -2px;margin-left:
3px;\">x</div>";
title.appendChild(closeButton);
var isVisible = true;
// 窗口关闭
closeButton.onclick = function(evt) {
isVisible = false;
panel.style.display = "none";
}
// 标题栏文字
var titleLabel = document.createElement("div");
titleLabel.style.height = "14px";
titleLabel.style.width = "200px";
titleLabel.style.fontSize = "11px";
titleLabel.style.color = "#ffffff";
titleLabel.style.styleFloat = titleLabel.style.cssFloat = "left";
titleLabel.style.fontFamily = "verdana,tahoma";
titleLabel.innerHTML = "Javascript Inline Debugger";
//titleLabel.style.marginTop = isIE() ? -14 : "-14px";
titleLabel.style.marginLeft = isIE() ? 18 : "18px";
title.appendChild(titleLabel);
// 中间的显示部分
var showPanel = document.createElement("div");
showPanel.style.width = "250px";
showPanel.style.height = isIE() ? "221px" : "219px";
showPanel.style.fontSize = "11px";
showPanel.style.padding = "0";
showPanel.style.margin = "0";
showPanel.style.overflow = "auto";
showPanel.style.marginTop = isIE() ? -1 : "0";
panel.appendChild(showPanel);
// 命令输入框
var cmdArea = document.createElement("div");
panel.appendChild(cmdArea);
var cmdTextbox = document.createElement("input");
cmdTextbox.type = "text";
cmdTextbox.style.width = "250px";
cmdTextbox.style.height = "12px";
cmdTextbox.style.fontSize = "12px";
cmdTextbox.style.padding = "0";
cmdTextbox.style.margin = "0";
cmdTextbox.style.marginTop = isIE() ? -2 : "0";
cmdTextbox.style.borderWidth = "0";
cmdTextbox.style.borderTopWidth = "1px";
cmdTextbox.style.paddingTop = "2px";
cmdArea.appendChild(cmdTextbox);
// 窗口激活或者不激活
var isActive = false;
// 激活窗口
var activateWindow = function() {
if (! isVisible) {
return;
}
if (isActive) {
return;
}
cmdTextbox.focus();
title.style.backgroundColor = "#015DF4";
isActive = true;
}
panel.onclick = activateWindow;
// 不激活窗口
var deactivateWindow = function() {
if (! isVisible) {
return;
}
if (! isActive) {
return;
}
title.style.backgroundColor = "#cccccc";
isActive = false;
}
cmdTextbox.onfocus = activateWindow;
cmdTextbox.onblur = deactivateWindow;
// 输出函数
var dbgPrint = function(s) {
showPanel.innerHTML += htmlEncode(s).replace(/\n|(\r\n)/g, "<br /
>");
if (parseInt(showPanel.scrollHeight) >
parseInt(showPanel.style.height)) {
showPanel.scrollTop += parseInt(showPanel.scrollHeight) -
parseInt(showPanel.style.height);
}
}
// 调用输入处理回调函数
cmdTextbox.onkeydown = function(evt) {
var event = evt || window.event;
if (event.keyCode == 0x0d) {
processInputProc(this.value, dbgPrint);
this.value = "";
}
}
}
// 坐标类
function Position(x, y) {
this.x = x;
this.y = y;
}
//---------------------------------------------------------------------------//
// 内联调试器类
//---------------------------------------------------------------------------//
function InlineDebugger() {
var bpList = new Array();
var id_eval;
// 设置断点
var bp = function(funcName) {
// 检查eval是否被hook
if ((new String(eval)).indexOf("[native code]") < 0) {
return "error: eval function was hooked by other codes in the front.
\n";
}
// 保存未被hooked的eval
id_eval = eval;
var re = /^[a-zA-Z0-9_\.]+$/i;
if (! re.test(funcName)) {
return "error: bad argument of command bp \"" + funcName + "\".\n";
}
try {
id_eval_r("if (typeof(" + funcName + ") == \"object\" || typeof(" +
funcName + ") == \"function\") {var obj = " + funcName + ";}");
} catch (e) {
return "error: " + e + ", invalid function name \"" + funcName +
"\".\n";
}
if (obj == undefined) {
return "error: the argument of command bp \"" + funcName + "\" is
not a function object.\n";
}
if ((new String(obj)).indexOf("function") < 0) {
return "error: the argument of command bp \"" + funcName + "\" is a
property, a function is required.\n";
}
if (bpList.search(funcName) >= 0) {
return "error: there is a breakpoint on function \"" + funcName +
"\"\n";
}
try {
var sc = "window." + funcName.replace(/\./g, "_") + "_bak = " +
funcName + ";\n" +
funcName + " = " +
"function() {\n" +
" var args = \"\";\n" +
" for (var i = 0; i < arguments.length; i ++) {\n" +
" args += arguments[i] + (i == (arguments.length - 1) ? \"\" :
\",\");\n" +
" }\n" +
" if (confirm(\"function \\\"" + funcName + "\\\" was called,
execute it?\\n\\narguments:\\n\" + args + \"" + " +
funcName + ".caller)) {\n" +
" id_eval_r(\"" + funcName.replace(/\./g, "_") + "_bak(\\\"\" +
jsEncode(args) + \"\\\")\");\n" +
" }\n" +
"};" +
"\n";
id_eval_r(sc);
bpList.push(funcName);
return "* breakpoint on function \"" + funcName + "\" added
successfully.\n";
} catch (e) {
return "unkown error: " + e + ".\n";
}
}
// 枚举所有的断点
var bl = function() {
if (bpList.length == 0) {
return "* no breakpoint.\n";
}
var bps = "* " + bpList.length + " breakpoints: \n";
for (var i = 0; i < bpList.length; i ++) {
bps += i + " - " + bpList[i] + "\n";
}
return bps;
}
// 清除某个断点
var bc = function(n) {
try {
n = parseInt(n);
} catch (e) {
return "error: bc command requires a numeric argument.\n";
}
if (bpList.length == 0) {
return "error: no breakpoint.\n";
}
var funcName = bpList.remove(n);
try {
eval_r(funcName + " = window." + funcName.replace(/\./g, "_") +
"_bak;");
return "* breakpoint on function \"" + funcName + "\" deleted
successfully.\n";
} catch (e) {
return "error: " + e + ".\n";
}
}
// 帮助
var help = function() {
var s = "debug commands:\n\n" +
"bp <function name> - set a breakpoint on a function, e.g. \"bp
window.alert\".\n" +
"bl - list all breakpoints.\n" +
"bc <breakpoint number> - remove a breakpoint by specified number,
e.g. \"bc 0\".\n" +
"help - help information.\n"
"\n";
return s;
}
// 处理命令
this.exeCmd = function(cmd) {
cmd = cmd.trim();
var cmdParts = cmd.split(/\s+/g);
var cmdName;
var cmdArg;
if (cmdParts.length == 1) {
cmdName = cmd;
} else {
cmdName = cmdParts[0];
cmdArg = cmdParts[1];
}
switch (cmdName) {
case "bp":
if (cmdArg == undefined) {
return "error: bp command requires an argument.\n";
} else {
return bp(cmdArg);
}
break;
case "bl":
return bl();
break;
case "bc":
if (cmdArg == undefined) {
return "error: bc command requires an argument \"number of
breakpoint\".\n";
} else {
return bc(cmdArg);
}
break;
case "help":
return help();
break;
default: return "error: command \"" + cmdName + "\" not found, you
can get information by \"help\" command.\n";
break;
}
}
}
//------------------------------------------------------------------------------//
// 主过程
//------------------------------------------------------------------------------//
var id = new InlineDebugger();
var console = new Console(document.body, function(s, printProc)
{printProc(id.exeCmd(s));});
