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从 ADB WiFi 源码看懂 ADB 协议握手:连接成功前到底发生了什么?

从 ADB WiFi 源码看懂 ADB 协议握手:连接成功前到底发生了什么?

平时我们点一下“连接”,很多时候会觉得 ADB 已经连上了。

其实不是。

真正能执行 shell 命令之前,设备和应用之间还要先完成一整套协议握手:先建立通道,再发 CNXN;如果设备要授权,就走 AUTH;授权通过后,再打开 shell:;后面还有 WRTE、OKAY、CLSE 这些消息,负责持续传输和清理。

这篇文章就从 ADB WiFi 的源码出发,把这条链路拆开讲清楚。

先把通道和协议分开

第一件事要分清:Socket 或 USB bulk endpoint 只是通道,不是协议本身。

在 ADB WiFi 里,TCP 连接会包装成 TcpChannel,USB OTG 会包装成 UsbChannel。底层一个走局域网端口,一个走 USB 设备连接,但上层的 AdbConnection 不关心这些差异。

它只关心三件事:

  1. 1. 能不能读满指定字节
  2. 2. 能不能把一个 AdbMessage 写出去
  3. 3. 能不能正常关闭

这就是为什么源码里会先统一通道,再谈协议。

ADB message 不是文本,是二进制包

ADB 协议的基本单位是消息。

在项目里,AdbMessage 把消息头固定成 24 个字节,小端序排列。它不是“发一行字符串”,而是按固定格式读写二进制包。

这 24 个字节里,最关键的是这几个字段:

  • • command
  • • arg0
  • • arg1
  • • data length
  • • data check
  • • magic

接收消息时,代码会先读满 24 字节头;如果 payload 不为空,再继续读 payload。

所以这里的核心不是“看起来像命令行”,而是“协议层按消息格式精确收发”。

第一包 CNXN,先把会话建立起来

真正开始握手时,AdbConnection.connect() 会先发出一个 CNXN 包。

代码大概是这样:

channel.writex(AdbProtocol.generateConnect());

这个包的意义很直接:告诉对方,我是 host 端,我支持这个协议版本,单次 payload 最大按这个值来。

写出 CNXN 以后,连接线程才开始持续读取对端返回的消息。直到对端也返回 CNXN,连接才真正算建立成功。

也就是说,Socket 连上了,不代表 ADB 连上了;CNXN 对上了,才算协议握手进入下一步。

AUTH 不是密码,是 token 签名

如果设备还没有信任当前应用的密钥,就会返回 AUTH

这里最容易被误解的一点是:它不是“输个密码登录”,而是“对 token 做签名”。

源码里第一次收到 token 时,会走类似这样的逻辑:

crypto.signAdbTokenPayload(msg.getPayLoad())

签名成功后,再发送 AUTH_TYPE_SIGNATURE。设备拿自己认识的公钥验证这个签名,确认是不是同一把私钥对应的 host key。

如果设备还不认识这把 key,代码会继续发送 RSA 公钥,触发设备端授权。

OPEN 打开 shell stream

握手通过后,TerminalEntrance 会调用:

mConnection.open("shell:")

这一步才是真正打开一个 shell stream。

OPEN 不是“执行命令”,它只是把一个可写的流打开。等对端回 OKAY 之后,这条 stream 才真正进入可写状态。

所以你在终端页里看到能输入命令,不是因为已经有一个 Socket,而是因为 ADB stream 已经完成了 OPEN -> OKAY 的确认。

WRTE 和 OKAY 负责流控

ADB stream 不是想写就一直写。

WRTE 负责传数据,OKAY 负责告诉对方可以继续发。

在 ADB WiFi 里,这套逻辑被放进了连接线程和 stream 的状态管理中:

  • • 本端写出去时,先等 writeReady
  • • 对端回 OKAY 后,恢复可写
  • • 对端发 WRTE 时,把 payload 放进读队列
  • • 然后回 OKAY,告诉对方继续

这就是这套协议里最实用的地方:它不是单次请求,而是一条持续流动的数据管道。

终端页为什么能稳定收发

终端页面实际上有两条业务线程在跑:

  1. 1. 写线程从命令队列里取输入,给命令补换行后写入 stream
  2. 2. 读线程不断从 stream 里取输出,再把内容交给界面显示

也就是说,界面上看到的实时输出,不是 UI 自己“猜出来的”,而是连接线程收到 WRTE 后,先把数据放进队列,再由读线程消费出来。

这样设计的好处很明显:状态清楚,关闭也干净。

关闭同样重要

当对端发送 CLSE,或者本端主动关闭时,项目会清理对应的 stream,通知等待中的读写线程退出。

这部分看起来没有握手那么“刺激”,但它决定了工具能不能稳定用。

无线调试、USB 拔出、连接失败、页面退出,这些场景都需要让等待中的线程醒过来,而不是卡死。

最后

所以,ADB WiFi 这条链路可以浓缩成一句话:

先把物理通道统一成 AdbChannel,再用 24 字节消息头承载 CNXNAUTHOPENWRTEOKAY 和 CLSE

理解了这条线,再回头看内置终端,你会发现它不是“发一条命令”这么简单,而是在手机应用里实现了一小段 host 端 ADB 客户端能力。

如果你平时也在做 Android 开发、测试或自动化,这条协议链路值得自己走一遍。

基本 文件 流程 错误 SQL 调试
  1. 请求信息 : 2026-07-23 21:21:22 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/789642.html
  2. 运行时间 : 0.136478s [ 吞吐率:7.33req/s ] 内存消耗:4,707.81kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=ef6d75927ee5c5a2a3ec5c0e48405693
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  1. CONNECT:[ UseTime:0.000507s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000859s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000325s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000257s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000486s ]
  6. SELECT * FROM `set` [ RunTime:0.000202s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000523s ]
  8. SELECT * FROM `article` WHERE `id` = 789642 LIMIT 1 [ RunTime:0.000741s ]
  9. UPDATE `article` SET `lasttime` = 1784812882 WHERE `id` = 789642 [ RunTime:0.017628s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.004447s ]
  11. SELECT * FROM `article` WHERE `id` < 789642 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000513s ]
  12. SELECT * FROM `article` WHERE `id` > 789642 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000709s ]
  13. SELECT * FROM `article` WHERE `id` < 789642 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.016650s ]
  14. SELECT * FROM `article` WHERE `id` < 789642 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002513s ]
  15. SELECT * FROM `article` WHERE `id` < 789642 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008135s ]
0.138194s