Android逆向之路---讓我們試試另一種方法看漫畫-(1)

MartinHan發表於2018-04-22
Android

前言

上週博主週末發燒了，所以停更，燒了好幾天，不得不說真的是好難受。 所以呢，希望大家也多注意注意身體。多鍛鍊，畢竟身體才是革命的本錢

本文分析基於：快看漫畫5.2.0(52000) 事先說明，這是一個系列，關於快看漫畫的系列，不過在今天寫看漫畫這個系列的時候，博主後面的工作也還沒有做呢，也希望在大家的監督之下一點一點的全部完成吧。 ps:避免廣告嫌疑，以下統稱kk漫畫了。

為什麼選擇這個app？ 排名靠前啊，反正就選到了， 有對別的感興趣的同學也歡迎投稿，博主會盡自己所能，給大家帶來點好玩的。

宣告

本文對kk漫畫只做技術研究，不做商用，如有雷同，概不負責

終極目標

不用kk漫畫官方app看漫畫，逆向協議，逆向程式碼，

本次的小目標

找到內部log開關，看看開發者列印了什麼重要日誌 然後大體看下此app內部都用了什麼技術 抓到kk漫畫的部分協議，嘗試性分析

找到內部log開關

首先下載好app後利用apktool拆包

 apktool d .\com.kuaikan.comic_5.2.0_52000.apk
複製程式碼

如你所見，本文使用的是5.2.0版本 內部版本號versionCode: '52000'

拆包之後，先看看app包名是com.kuaikan.comic，所以我們主要就看這個資料夾下的大體結構 Android逆向之路---讓我們試試另一種方法看漫畫-(1)

然後我發現了他的LogUtil類，那就進去看看吧。看到了如下程式碼，看不懂不要著急，我稍做解釋

.line 16
    new-instance v0, Ljava/io/File;

    new-instance v1, Ljava/lang/StringBuilder;

    invoke-direct {v1}, Ljava/lang/StringBuilder;-><init>()V

    sget-object v2, Lcom/kuaikan/comic/util/FileUtil;->b:Ljava/lang/String;

    invoke-virtual {v1, v2}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;

    move-result-object v1

    const-string v2, "/kkmh_debug"

    invoke-virtual {v1, v2}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;

    move-result-object v1

    invoke-virtual {v1}, Ljava/lang/StringBuilder;->toString()Ljava/lang/String;

    move-result-object v1

    invoke-direct {v0, v1}, Ljava/io/File;-><init>(Ljava/lang/String;)V

    invoke-virtual {v0}, Ljava/io/File;->exists()Z

    move-result v0

    sput-boolean v0, Lcom/kuaikan/comic/util/LogUtil;->a:Z
複製程式碼

博主幫你轉java，你再看，看不懂你可以打人，當然是別人啊

public static boolean a = new File(FileUtil.b + "/kkmh_debug").exists()
複製程式碼

smali囉哩囉唆，其實轉成java就這麼一行， 我們就靠直覺，一起來猜，這個FileUtil.b + /kkmh_debug是不是就有很大的概率就是那個debug_log的開關了呢。

我們建立檔案試一試，有個疑問？FileUtil.b路徑在哪裡呢，那我們就跟過去看看

# direct methods
.method static constructor <clinit>()V
    .locals 2

    .prologue
    .line 36
    new-instance v0, Ljava/lang/StringBuilder;

    invoke-direct {v0}, Ljava/lang/StringBuilder;-><init>()V

    invoke-static {}, Landroid/os/Environment;->getExternalStorageDirectory()Ljava/io/File;

    move-result-object v1

    invoke-virtual {v0, v1}, Ljava/lang/StringBuilder;->append(Ljava/lang/Object;)Ljava/lang/StringBuilder;

    move-result-object v0

    const-string v1, "/KuaiKan"

    invoke-virtual {v0, v1}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;

    move-result-object v0

    invoke-virtual {v0}, Ljava/lang/StringBuilder;->toString()Ljava/lang/String;

    move-result-object v0

    sput-object v0, Lcom/kuaikan/comic/util/FileUtil;->b:Ljava/lang/String;

    return-void
.end method
複製程式碼

彆著急，博主再幫你手動轉成java來看


StringBuilder sb = new StringBuilder();
sb.append(Environemt.getExternalStorageDirectory())
sb.append(|"/KuaiKan");
FileUtil.b = sb.toString();

複製程式碼

以上的這些話在方法裡面，其實你可以理解為就是類在初始化的時候，虛擬機器會執行這些程式碼，以便於給b賦值初值，這個方法你平時不會自己用到，但是虛擬機器會用到啊。

所以呢，按照上面的來說，我們基本上定位好了，那麼我就在我的sd卡的根目錄建立好了/KuaiKan資料夾，然後裡面建立了一個空的kkmh_debug檔案。

看看快看漫畫大概用了什麼技術

其實有一些可能不是kk漫畫程式設計師主動用的，而是引入了一些第三方庫，他們自帶的，那些我就不一一列舉了

  • frecso圖片載入框架
  • butterknife
  • 極光推送
  • shareSDK
  • google的zxing二維碼識別
  • jakewharton的retrofit2
  • hybird
  • okhttp
  • 七牛雲端儲存

太多了，就不一一列舉了，有興趣大家自己去看

一起去看協議吧

按照上面說的方法，debug log開關就算是開啟了，然後我們嘗試著請求一個漫畫，看看他是不是把所有資訊都列印出來了。

我呢，就用一個例子來試試吧。"搜神記"，如圖

Android逆向之路---讓我們試試另一種方法看漫畫-(1)

點選後，我們看log日誌, 我擷取一些看著比較有用的日誌，來貼出來

下面的是他的打點統計日誌

03-26 04:14:06.682: D/TrackRouterManger(7288): [ (TrackRouterManger.java:242)#h ] level=2,current node=Node{id=111, parentId=11, path='發現/推薦', page='FindRec', kid.size=2}
複製程式碼

一些activity棧的資訊

03-26 04:14:06.692: V/ActivityRecordMgr(7288): [ (ActivityRecordMgr.java:102)#d ] -----------------Activity stack begin---------------------
03-26 04:14:06.692: V/ActivityRecordMgr(7288): [ (ActivityRecordMgr.java:105)#d ] Activity Stack[0]com.kuaikan.comic.ui.MainActivity@429f4e08 # lifeState=onPause
03-26 04:14:06.692: V/ActivityRecordMgr(7288): [ (ActivityRecordMgr.java:107)#d ] -----------------Activity stack end-----------------------

複製程式碼

此時此刻我的頁面是這個樣子的，為什麼要給大家看這個呢，因為看了頁面，才能知道他的資料來源獲取

Android逆向之路---讓我們試試另一種方法看漫畫-(1)

資料來源如下，已經在log裡發現了 Android逆向之路---讓我們試試另一種方法看漫畫-(1)

我們點選當前頁面的開始閱讀，然後繼續看log。

log如下,log太多了，我就擷取一部分關鍵的了

03-26 04:23:14.672: D/OkHttp(7288): {"code":200,"data":{"comment_view_message":"吐槽神馬的儘管來","can_view":true,"cover_image_url":"http://f2.kkmh.com/image/171104/7tmqcg0ho.webp-w750","created_at":1509616533,"recommend":{"recommend_list":[{"male_vertical_image_url":"http://f2.kkmh.com/image/161212/804va2fbp.webp-w320.w","vertical_image_url":"http://f2.kkmh.com/image/161212/804va2fbp.webp-w320.w","recommend_tag":["奇幻","古風","劇情"],"topic_id":885,"recommend_source":"AI推薦","title":"美人為將"},{"male_vertical_image_url":"http://f2.kkmh.com/image/170222/jvwhcv89p.webp-w320.w","vertical_image_url":"http://f2.kkmh.com/image/170222/jvwhcv89p.webp-w320.w","recommend_tag":["古風","穿越"],"topic_id":1035,"recommend_source":"AI推薦","title":"蓬山遠"},{"male_vertical_image_url":"http://f2.kkmh.com/image/170922/jlihj7f6n.webp-w320.w","vertical_image_url":"http://f2.kkmh.com/image/170922/jlihj7f6n.webp-w320.w","recommend_tag":["古風","宮鬥"],"topic_id":1518,"recommend_source":"AI推薦","title":"妃·夕妍雪"}],"title":"猜你喜歡"},"is_favourite":false,"title":"搜神記：上古神話開啟","widgets":[],"recommend_count":0,"updated_at":1509615372,"selling_kk_currency":0,"zoomable":0,"push_flag":1,"previous_comic_id":null,"share":{"award":false,"activity_id":null,"show_draw_record":false,"title":""},"customized_share":[{"description":"改編自樹下野狐同名小說《搜神記》，傳說中三皇五帝時代，隨著天下公認的領袖去世，各族群雄蠢蠢欲動。在此動盪時代，一位少年橫空出世，機緣巧合下進入了一個愛恨情仇的古代神話世界……\r\n","share_platform":1,"title":"好看哭！《搜神記》這個漫畫太優秀了！","picture":"http://f2.kkmh.com/image/171104/7tmqcg0ho.webp-w750","url":"https://m.kuaikanmanhua.com/comics/57778"},{"description":"改編自樹下野狐同名小說《搜神記》，傳說中三皇五帝時代，隨著天下公認的領袖去世，各族群雄蠢蠢欲動。在此動盪時代，一位少年橫空出世，機緣巧合下進入了一個愛恨情仇的古代神話世界……\r\n","share_platform":4,"title":"好看哭！《搜神記》這個漫畫太優秀了！","picture":"http://f2.kkmh.com/image/171104/7tmqcg0ho.webp-w750","url":"https://m.kuaikanmanhua.com/comics/57778"},{"description":"改編自樹下野狐同名小說《搜神記》，傳說中三皇五帝時代，隨著天下公認的領袖去世，各族群雄蠢蠢欲動。在此動盪時代，一位少年橫空出世，機緣巧合下進入了一個愛恨情仇的古代神話世界……\r\n","share_platform":3,"title":"好看哭！《搜神記》這個漫畫太優秀了！","picture":"http://f2.kkmh.com/image/171104/7tmqcg0ho.webp-w750","url":"https://m.kuaikanmanhua.com/comics/57778"},{"description":"好看哭！《搜神記》這個漫畫太優秀了！傳送門：https://m.kuaikanmanhua.com/comics/57778 ","share_platform":5,"title":"","picture":"http://f2.kkmh.com/image/171104/7tmqcg0ho.webp-w750","url":"https://m.kuaikanmanhua.com/comics/57778"},{"description":"","share_platform":2,"title":"好看哭！《搜神記》這個漫畫太優秀了！","picture":"http://f2.kkmh.com/image/171104/7tmqcg0ho.webp-w750","url":"https://m.kuaikanmanhua.com/comics/57778"}],"id":57778,"comic_type":0,"is_login":false,"is_liked":false,"images":["http://p1.kkmh.com/image/c57778/171104/ly6huctjr.webp-c.w1080?sign=abc129032198c237159d029e0715d759&t=5abbf9b2","http://p1.kkmh.com/image/c57778/171104/gkfv3xx80.webp-c.w1080?sign=3a8807108a14ed9f49a2750dbe168ba3&t=5abbf9b2","http://p1.kkmh.com/image/c57778/171104/tjc901nwz.webp-c.w1080?sign=a2d7be2867052a445587e21ccb7ee14b&t=5abbf9b2","http://p1.kkmh.com/image/c57778/171104/5kzfzqffd.webp-c.w1080?sign=6b52f8285c515d8a266af32981bae787&t=5abbf9b2","http://p1.kkmh.com/image/c57778/171104/cahur12gy.webp-c.w1080?sign=f514ff5bd33c0c6e4f27ec19f55dc919&t=5abbf9b2","http://p1.kkmh.com/image/c57778/171104/0pigomyew.webp-c.w1080?sign=003061dd0a43130cf177fc3b193b94fb&t=5abbf9b2","http://p1.kkmh.com/image/c57778/171104/0qfpkk2vk.web
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複製程式碼

好了好了，到了這裡，相信你就已經發現了，漫畫的種種url已經暴露出來了，比如下面這個

http://p1.kkmh.com/image/c57778/171104/pzsmr1sls.webp-c.w1080?sign=18e97d8dfad73802d55500a19d1fb7d0&t=5abbf9b2

http://p1.kkmh.com/image/c57778/171104/ef89i1pdz.webp-c.w1080?sign=f961707f8198e7d37d0d79c88a12a839&t=5abbf9b2

http://p1.kkmh.com/image/c57778/171104/y2qai7jw2.webp-c.w1080?sign=1e5c7c43613757a19d60cec457f501ee&t=5abbf9b2

複製程式碼

告一段落

好了好了，其實說到了這裡，今天就說到這裡吧，具體的如何自己寫個工具把一整本書都提取出來，我們可以下次分著說。 慢慢來，彆著急。

我希望呢，自己寫部落格，能夠認認真真的寫出一點東西分享給大家，而不是網上抄來抄去。希望能做一個踏踏實實做技術的人吧，不敢求太多，能給大家帶來點好玩的就挺好。

寫在最後

如有雷同，概不負責啊，有什麼問題歡迎給博主指出。

關於我

個人網站：MartinHan的小站

部落格：hanhan12312的專欄

知乎：MartinHan01

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