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调试 - 网络抓包

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2023-12-01

下面的例子中我们通过tcpdump查看workerman-chat应用通过websocket传输的数据。workerman-chat例子中服务端是通过7272端口对外提供websocket服务的，所以我们抓取7272端口上的数据包。

1、运行命令 tcpdump -Ans 4096 -iany port 7272

2、在浏览器地址栏输入 http://127.0.0.1:55151

3、输入昵称 mynick

4、发表框输入 hi, all ！

最终抓取的数据如下:

  1. /*
  2.  * TCP第一次握手
  3.  * 浏览器本地端口60653向远程端口7272发送SYN包
  4.  */
  5. 17:50:00.523910 IP 127.0.0.1.60653 > 127.0.0.1.7272: Flags [S], seq 3524290970, win 32768, options [mss 16396,sackOK,TS val 28679666 ecr 28679554,nop,wscale 7], length 0
  6. E..<.h@.@.HQ...........h..i..........0....@....
  7. ............
  9. /*
  10.  * TCP第二次握手
  11.  * 远程端口7272向浏览器端口60653回应SYN+ACK包
  12.  */
  13. 17:50:00.523935 IP 127.0.0.1.7272 > 127.0.0.1.60653: Flags [S.], seq 692696454, ack 3524290971, win 32768, options [mss 16396,sackOK,TS val 28679666 ecr 28679666,nop,wscale 7], length 0
  14. E..<..@.@.<..........h..)I....i......0....@....
  15. ............
  17. /*
  18.  * TCP第三次握手，完成TCP链接
  19.  * 浏览器本地端口60653向远程端口7272发送ACK包
  20.  */
  21. 17:50:00.523948 IP 127.0.0.1.60653 > 127.0.0.1.7272: Flags [.], ack 1, win 256, options [nop,nop,TS val 28679666 ecr 28679666], length 0
  22. E..4.i@.@.HX...........h..i.)I.......(.....
  23. ........
  25. /*
  26.  * websocket握手
  27.  * 浏览器本地端口60653向远程端口7272发送websocket握手请求数据
  28.  */
  29. 17:50:00.524412 IP 127.0.0.1.60653 > 127.0.0.1.7272: Flags [P.], seq 1:716, ack 1, win 256, options [nop,nop,TS val 28679666 ecr 28679666], length 715
  30. E....j@.@.E............h..i.)I.............
  31. ........GET / HTTP/1.1
  32. Host: 127.0.0.1:7272
  33. User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:31.0) Gecko/20100101 Firefox/31.0
  34. Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
  35. Accept-Language: zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3
  36. Accept-Encoding: gzip, deflate
  37. Sec-WebSocket-Version: 13
  38. Origin: http://127.0.0.1:55151
  39. Sec-WebSocket-Key: zPDr6m4czzUdOFnsxIUEAw==
  40. Cookie: Hm_lvt_abcf9330bef79b4aba5b24fa373506d9=1402048017; Hm_lvt_5fedb3bdce89499492c079ab4a8a0323=1403063068,1403141761; Hm_lvt_7b1919221e89d2aa5711e4deb935debd=1407836536; Hm_lpvt_7b1919221e89d2aa5711e4deb935debd=1407837000
  41. Connection: keep-alive, Upgrade
  42. Pragma: no-cache
  43. Cache-Control: no-cache
  44. Upgrade: websocket
  46. /*
  47.  * websocket握手
  48.  * 远程端口7272向浏览器端口60653发送ACK包，表明远程7272端口已经收到websocket握手请求数据
  49.  */
  50. 17:50:00.524423 IP 127.0.0.1.7272 > 127.0.0.1.60653: Flags [.], ack 716, win 256, options [nop,nop,TS val 28679666 ecr 28679666], length 0
  51. E..4(u@.@..M.........h..)I....lf.....(.....
  52. ........
  54. /*
  55.  * websocket握手
  56.  * 远程端口7272向浏览器端口60653发送websocket握手回应，表明握手成功
  57.  */
  58. 17:50:00.535918 IP 127.0.0.1.7272 > 127.0.0.1.60653: Flags [P.], seq 1:157, ack 716, win 256, options [nop,nop,TS val 28679669 ecr 28679666], length 156
  59. E...(v@.@............h..)I....lf...........
  60. ........HTTP/1.1 101 Switching Protocols
  61. Upgrade: websocket
  62. Sec-WebSocket-Version: 13
  63. Connection: Upgrade
  64. Sec-WebSocket-Accept: nSsCeIBUsFnDJCRb/BNlFzBUDpM=
  66. /*
  67.  * websocket握手成功
  68.  * 浏览器本地端口60653向远程端口7272发送ACK，表明接收到websocket握手回应数据
  69.  */
  70. 17:50:00.535932 IP 127.0.0.1.60653 > 127.0.0.1.7272: Flags [.], ack 157, win 256, options [nop,nop,TS val 28679669 ecr 28679669], length 0
  71. E..4.k@.@.HV...........h..lf)I.#.....(.....
  72. ........
  74. /*
  75.  * 输入昵称请求
  76.  * 浏览器通过websocket协议向7272端口发送 昵称 请求 {"type":"login","name":"mynick"}
  77.  * 由于浏览器向服务端发送的数据为websocket协议掩码处理过的数据，所以无法看到原文 {"type":"login","name":"mynick"}
  78.  */
  79. 17:50:30.652680 IP 127.0.0.1.60653 > 127.0.0.1.7272: Flags [P.], seq 716:754, ack 157, win 256, options [nop,nop,TS val 28687198 ecr 28679669], length 38
  80. E..Z.l@.@.H/...........h..lf)I.#.....N.....
  81. ...^.......&_...+..C}..J0..H}..H>...e.._1..M}.
  83. /*
  84.  * 输入昵称请求
  85.  * 7272端口向浏览器返回ACK，表明昵称请求已经接收，并返回用户列表{"type":"user_list" ...
  86.  */
  87. 17:50:30.653546 IP 127.0.0.1.7272 > 127.0.0.1.60653: Flags [P.], seq 157:267, ack 754, win 256, options [nop,nop,TS val 28687198 ecr 28687198], length 110
  88. E...(w@.@............h..)I.#..l............
  89. ...^...^.l{"type":"user_list","user_list":[{"uid":783654164,"name":"u732au732a"},{"uid":783700053,"name":"mynick"}]}
  91. /*
  92.  * 输入昵称请求
  93.  * 浏览器返回ACK，表明用户列表数据已经收到
  94.  */
  95. 17:50:30.653559 IP 127.0.0.1.60653 > 127.0.0.1.7272: Flags [.], ack 267, win 256, options [nop,nop,TS val 28687198 ecr 28687198], length 0
  96. E..4.m@.@.HT...........h..l.)I.......(.....
  97. ...^...^
  99. /*
  100.  * 输入昵称请求
  101.  * 7272端口向浏览器返回ACK，并返回用登录结果{"type":"login",...
  102.  */
  103. 17:50:30.653689 IP 127.0.0.1.7272 > 127.0.0.1.60653: Flags [P.], seq 267:346, ack 754, win 256, options [nop,nop,TS val 28687198 ecr 28687198], length 79
  104. E...(x@.@............h..)I....l......w.....
  105. ...^...^.M{"type":"login","uid":783700053,"name":"mynick","time":"2014-08-12 17:50:30"}
  107. /*
  108.  * 输入昵称请求 完毕
  109.  * 浏览器返回ACK，表明登录结果数据包收到
  110.  */
  111. 17:50:30.653695 IP 127.0.0.1.60653 > 127.0.0.1.7272: Flags [.], ack 346, win 256, options [nop,nop,TS val 28687198 ecr 28687198], length 0
  112. E..4.n@.@.HS...........h..l.)I.......(.....
  113. ...^...^
  115. /*
  116.  * 服务端7272端口通知其它浏览器有新用户登录
  117.  */
  118. 17:50:30.653749 IP 127.0.0.1.7272 > 127.0.0.1.60584: Flags [P.], seq 436:515, ack 816, win 256, options [nop,nop,TS val 28687198 ecr 28577913], length 79
  119. E.....@.@.3..........h..f....G.......w.....
  120. ...^...y.M{"type":"login","uid":783700053,"name":"mynick","time":"2014-08-12 17:50:30"}
  122. /*
  123.  * 其它浏览器返回 ACK,表明收到新用户登录通知的请求
  124.  */
  125. 17:50:30.653755 IP 127.0.0.1.60584 > 127.0.0.1.7272: Flags [.], ack 515, win 256, options [nop,nop,TS val 28687198 ecr 28687198], length 0
  126. E..4.X@.@.#j...........h.G..f..$.....(.....
  127. ...^...^
  129. /*
  130.  * mynick用户发言 hi, all !
  131.  * 浏览器向服务端7272端口发送发言数据 {"type":"say","to_uid":"all","content":"hi,  all !"}
  132.  * 由于浏览器向服务端发送的数据为websocket协议掩码处理过的数据，所以无法看到原文
  133.  */
  134. 17:51:02.775205 IP 127.0.0.1.60653 > 127.0.0.1.7272: Flags [P.], seq 754:812, ack 346, win 256, options [nop,nop,TS val 28695228 ecr 28687198], length 58
  135. E..n.o@.@.H............h..l.)I.......b.....
  136. fTX.d.P[(...9H..C=LT.~.BV=...0SnB-X.
  138. /*
  139.  * mynick用户发言 hi, all !
  140.  * 7272端口向所有浏览器客户端中一个浏览器转发发言数据 {"type":"say","from_uid":....
  141.  */
  142. 17:51:02.776785 IP 127.0.0.1.7272 > 127.0.0.1.60653: Flags [P.], seq 346:448, ack 812, win 256, options [nop,nop,TS val 28695229 ecr 28695228], length 102
  143. E...(y@.@............h..)I....l............
  144. .........d{"type":"say","from_uid":783700053,"to_uid":"all","content":"hi,  all !","time":"2014-08-12 :51:02"}
  146. /*
  147.  * mynick用户发言 hi, all !
  148.  * 浏览器响应ACK，收到发言数据
  149.  */
  150. 17:51:02.776808 IP 127.0.0.1.60653 > 127.0.0.1.7272: Flags [.], ack 448, win 256, options [nop,nop,TS val 28695229 ecr 28695229], length 0
  151. E..4.p@.@.HQ...........h..l.)I.F.....(.....
  152. ........
  154. /*
  155.  * mynick用户发言 hi, all !
  156.  * 7272端口向所有浏览器客户端中一个浏览器转发发言数据 {"type":"say","from_uid":....
  157.  */
  158. 17:51:02.776827 IP 127.0.0.1.7272 > 127.0.0.1.60584: Flags [P.], seq 515:617, ack 816, win 256, options [nop,nop,TS val 28695229 ecr 28687198], length 102
  159. E.....@.@.3g.........h..f..$.G.............
  160. .......^.d{"type":"say","from_uid":783700053,"to_uid":"all","content":"hi,  all !","time":"2014-08-12 :51:02"}
  162. /*
  163.  * mynick用户发言 hi, all ! ，所有浏览器都收到转发的发言数据，发言完毕
  164.  * 浏览器响应ACK，收到发言数据
  165.  */
  166. 17:51:02.776842 IP 127.0.0.1.60584 > 127.0.0.1.7272: Flags [.], ack 617, win 256, options [nop,nop,TS val 28695229 ecr 28695229], length 0
  167. E..4.Y@.@.#i...........h.G..f........(.....
  168. ........

以上是登录+发言的所有所有请求，一共有两个浏览器客户端。

包数据中[S]代表SYN请求（发起链接请求）；[.]代表ACK回应，说明请求对端已经收到；[P]代表发送数据；[P.]代表[P] + [.]

如果端口上传输的数据是二进制数据，则可以以十六进制来查看 tcpdump -XAns 4096 -iany port 7272

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