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爬虫关键函数定位方法(1)——事件定位

code • 2022-4-29 • python • 阅读 61

爬虫关键函数定位方法(1)——事件定位,第1张

目标站点: https://xinshangmeng.com/

同样先看看发包过程

j_mmrm是用户名, j_mcmm是密码, 密码被加密了, 下面寻找这个加密的关键函数

首先定位到这个按钮, 然后产看Event Listeners

这里是通过form表单发送请求的, from表单在提交动作完成之前会先触发onsubmit事件，默认返回true。如果返回true，则发送请求；若false，则终止请求。

所以可以看submit事件

通过这个id选择器, 也可以判断出来这个就是关键的函数了, 跟进去如下:

function e() {
    var a = L.userName();
    if ("" == a)
        return Q = !1,
        G.alert("请输入用户名！").done(function() {
            d(y)
        }),
        !1;
    var b = L.password();
    if ("" == b)
        return Q = !1,
        G.alert("请输入密码！").done(function() {
            d(z)
        }),
        !1;
    var c = I.getValue();
    if (I.isActive() && !c)
        return Q = !1,
        G.alert("请输入验证码！").done(function() {
            I.focus()
        }),
        !1;
    u();
    var e = b;
    b = F(F(b) + c);
    var g = {
        protocol: location.protocol,
        loginIndex: location.href
    };
    return g.j_mmrm = a,
    g.j_mcmm = b,
    g.j_valcode = c,
    P.j_mmrm = a,
    P.j_mcmm = F(F(e) + ""),
    E.getCookie("usercomcookieId").done(function(b) {
        b && "null" !== b && (b = b.split(",")[0]) !== a.toUpperCase() && (g.j_puserId = b,
        P.j_puserId = b,
        E.getCookie("myguid1234567890").done(function(a) {
            g.j_guid = a,
            P.j_guid = a
        }))
    }).always(function() {
        J.login(g).done(f).fail(q)
    }),
    !1
}

该函数首先判断输入的用户名、密码、验证码是否为空

接下来执行u函数, u函数如下:

function u() {
    E.clearCookie("/"),
    E.clearCookie("/app/"),
    E.clearCookie("/", ".xinshangmeng.com"),
    E.clearCookie("/", ".preview.xinshangmeng.com"),
    E.clearCookie("/", ".test.xinshangmeng.com"),
    E.clearCookie("/", ".dynamic.xinshangmeng.com")
}

// E.clearCookie
function j(a, b) {
    $.ajax({
        type: "GET",
        url: XSMConfig.login + "/cookieTool?method=clearCookieAjax",
        dataType: "jsonp",
        exceptName: "myguid1234567890",
        data: {
            domain: k.encrypt(b || document.domain),
            path: k.encrypt(a)
        }
    })
}

发送了六个请求, 如下:

u函数清除了cookie

var e = b;
b = F(F(b) + c);

b就是明文密码, c是验证码, 接下来经过F(F(b)+c)对密码进行加密

// F函数
function d(a) {
    return n(e(o(m(a + "{1#2%4(5)6@7!poeeww%4(5)djjkkldss}")), 32))
}

F函数里面嵌套了好多次函数, o、e、n

一个一个看, 首先看m

首先将密码与"{1#2%4(5)6@7!poeeww%4(5)djjkkldss}"拼接, 之后交给m

// m函数
function m(a) {
    for (var b = a.length, c = new Array(b), d = 0; d < b; d++) {
        var e = a.charCodeAt(d);	// charCodeAt返回字符串第一个字符的 Unicode 编码(H 的 Unicode 值):
        c[d] = 255 & e
    }
    return c
}

m函数将传入的字符串转换成了对应的Unicode编码

再看o函数, 将密码+"{1#2%4(5)6@7!poeeww%4(5)djjkkldss}"的Unicode值数组传给o

function o(a) {
    for (var b = 1 + (a.length + 8 >> 6), c = new Array(16 * b), d = 0; d < 16 * b; d++)
        c[d] = 0;
    for (var e = 0; e < a.length; e++)
        c[e >> 2] |= (255 & a[e]) << e % 4 * 8;
    return c[e >> 2] |= 128 << e % 4 * 8, c[16 * b - 2] = 8 * a.length, c
}

最后看e函数, e函数有两个参数, 第一个是o处理过的数组, 第二个是32

function e(a, b) {
    for (var c = 1732584193, d = -271733879, e = -1732584194, f = 271733878, l = 0; l < a.length; l += 16) {
        var m = c
          , n = d
          , o = e
          , p = f;
        c = g(c, d, e, f, a[l + 0], 7, -680876936),
        f = g(f, c, d, e, a[l + 1], 12, -389564586),
        e = g(e, f, c, d, a[l + 2], 17, 606105819),
        d = g(d, e, f, c, a[l + 3], 22, -1044525330),
        c = g(c, d, e, f, a[l + 4], 7, -176418897),
        f = g(f, c, d, e, a[l + 5], 12, 1200080426),
        e = g(e, f, c, d, a[l + 6], 17, -1473231341),
        d = g(d, e, f, c, a[l + 7], 22, -45705983),
        c = g(c, d, e, f, a[l + 8], 7, 1770035416),
        f = g(f, c, d, e, a[l + 9], 12, -1958414417),
        e = g(e, f, c, d, a[l + 10], 17, -42063),
        d = g(d, e, f, c, a[l + 11], 22, -1990404162),
        c = g(c, d, e, f, a[l + 12], 7, 1804603682),
        f = g(f, c, d, e, a[l + 13], 12, -40341101),
        e = g(e, f, c, d, a[l + 14], 17, -1502002290),
        d = g(d, e, f, c, a[l + 15], 22, 1236535329),
        c = h(c, d, e, f, a[l + 1], 5, -165796510),
        f = h(f, c, d, e, a[l + 6], 9, -1069501632),
        e = h(e, f, c, d, a[l + 11], 14, 643717713),
        d = h(d, e, f, c, a[l + 0], 20, -373897302),
        c = h(c, d, e, f, a[l + 5], 5, -701558691),
        f = h(f, c, d, e, a[l + 10], 9, 38016083),
        e = h(e, f, c, d, a[l + 15], 14, -660478335),
        d = h(d, e, f, c, a[l + 4], 20, -405537848),
        c = h(c, d, e, f, a[l + 9], 5, 568446438),
        f = h(f, c, d, e, a[l + 14], 9, -1019803690),
        e = h(e, f, c, d, a[l + 3], 14, -187363961),
        d = h(d, e, f, c, a[l + 8], 20, 1163531501),
        c = h(c, d, e, f, a[l + 13], 5, -1444681467),
        f = h(f, c, d, e, a[l + 2], 9, -51403784),
        e = h(e, f, c, d, a[l + 7], 14, 1735328473),
        d = h(d, e, f, c, a[l + 12], 20, -1926607734),
        c = i(c, d, e, f, a[l + 5], 4, -378558),
        f = i(f, c, d, e, a[l + 8], 11, -2022574463),
        e = i(e, f, c, d, a[l + 11], 16, 1839030562),
        d = i(d, e, f, c, a[l + 14], 23, -35309556),
        c = i(c, d, e, f, a[l + 1], 4, -1530992060),
        f = i(f, c, d, e, a[l + 4], 11, 1272893353),
        e = i(e, f, c, d, a[l + 7], 16, -155497632),
        d = i(d, e, f, c, a[l + 10], 23, -1094730640),
        c = i(c, d, e, f, a[l + 13], 4, 681279174),
        f = i(f, c, d, e, a[l + 0], 11, -358537222),
        e = i(e, f, c, d, a[l + 3], 16, -722521979),
        d = i(d, e, f, c, a[l + 6], 23, 76029189),
        c = i(c, d, e, f, a[l + 9], 4, -640364487),
        f = i(f, c, d, e, a[l + 12], 11, -421815835),
        e = i(e, f, c, d, a[l + 15], 16, 530742520),
        d = i(d, e, f, c, a[l + 2], 23, -995338651),
        c = j(c, d, e, f, a[l + 0], 6, -198630844),
        f = j(f, c, d, e, a[l + 7], 10, 1126891415),
        e = j(e, f, c, d, a[l + 14], 15, -1416354905),
        d = j(d, e, f, c, a[l + 5], 21, -57434055),
        c = j(c, d, e, f, a[l + 12], 6, 1700485571),
        f = j(f, c, d, e, a[l + 3], 10, -1894986606),
        e = j(e, f, c, d, a[l + 10], 15, -1051523),
        d = j(d, e, f, c, a[l + 1], 21, -2054922799),
        c = j(c, d, e, f, a[l + 8], 6, 1873313359),
        f = j(f, c, d, e, a[l + 15], 10, -30611744),
        e = j(e, f, c, d, a[l + 6], 15, -1560198380),
        d = j(d, e, f, c, a[l + 13], 21, 1309151649),
        c = j(c, d, e, f, a[l + 4], 6, -145523070),
        f = j(f, c, d, e, a[l + 11], 10, -1120210379),
        e = j(e, f, c, d, a[l + 2], 15, 718787259),
        d = j(d, e, f, c, a[l + 9], 21, -343485551),
        c = k(c, m),
        d = k(d, n),
        e = k(e, o),
        f = k(f, p)
    }
    return new Array(c,d,e,f)
}

其实就是md5

最后就是n函数, 将e *** 作后的结果传入

function n(a) {
    for (var b = "0123456789abcdef", c = "", d = 0; d < 4 * a.length; d++)
        c += b.charAt(a[d >> 2] >> d % 4 * 8 + 4 & 15) + b.charAt(a[d >> 2] >> d % 4 * 8 & 15);
    return c
}

最后在进行一次F函数 *** 作, 就得到了密文

继续看发包的函数

var g = {
    protocol: location.protocol,
    loginIndex: location.href
};
return g.j_mmrm = a,
g.j_mcmm = b,
g.j_valcode = c,
P.j_mmrm = a,
P.j_mcmm = F(F(e) + ""),
E.getCookie("usercomcookieId").done(function(b) {
    b && "null" !== b && (b = b.split(",")[0]) !== a.toUpperCase() && (g.j_puserId = b,
    P.j_puserId = b,
    E.getCookie("myguid1234567890").done(function(a) {
        g.j_guid = a,
        P.j_guid = a
    }))
}).always(function() {
    J.login(g).done(f).fail(q)
}),
!1

这里首先对对象g、P和E成员进行了赋值, 之后调用E.getCookie, 跟进去看一下该函数

function g(a) {
    var b = $.Deferred();
    return $.ajax({
        type: "GET",
        url: XSMConfig.login + "/cookieTool?method=getCookieAjax",
        dataType: "jsonp",
        timeout: 5e3,
        data: {
            cookieName: k.encrypt(a)
        }
    }).done(function(a) {
        a && "000" === a.code ? b.resolve(k.decrypt(a.data)) : b.reject()
    }).always(function() {
        b.reject()
    }),
    b.promise()
}

这里封装了一个GET请求, 也就是之前抓包中看到的那个请求

之后调用J.login(g)来发送请求数据包

c.login = function(a) {
    return $.ajax({
        url: XSMConfig.login + "/users/dologin/dfaup",
        type: "post",
        dataType: "jsonp",
        jsonp: "jsonp",
        data: a
    })
}


补充：

  • always():一定会执行

  • catch():执行出错时执行(本体 object)

  • done():执行成功时执行

  • failed():执行出错时执行(服务器拒绝)

  • pipe():过滤方法

  • progress():当对象生成进度通知时，调用添加处理程序

  • Promise():返回Object(延迟)的Promise（承诺）对象

  • state():确定一个Object（延迟）对象的当前状态

  • then():当（延迟）对象解决，拒绝或仍在进行中时，调用添加处理程序

欢迎分享，转载请注明来源：内存溢出

原文地址: https://outofmemory.cn/langs/743388.html

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