1. 手机要有root权限
2. 下载tcpdump
http://www.strazzere.com/android/tcpdump
3.上传tcpdump到手机
$ adb push c:\wherever_you_put\tcpdump /data/local/tcpdump
如果提示
failed to copy 'tcpdump' to '/data/local/tcpdump': Permission denied
则如下操作后重试
$ adb shell $ su $ chmod -R 777 /data/local $ exit
4.给予tcpdump 执行权限
$ adb shell chmod 6755 /data/local/tcpdump
5.连接到手机的控制端,获得root权限
$ adb shell $ su
6.切换到tcpdump 的所在目录
$ cd /data/local
7.抓包
$ ./tcpdump -i any -p -s 0 -w /sdcard/capture.pcap
tcpdump 命令参数：
# "-i any": listen on any network interface
# "-p": disable promiscuous mode (doesn't work anyway)
# "-s 0": capture the entire packet
# "-w": write packets to a file (rather than printing to stdout)
... do whatever you want to capture, then ^C to stop it ...
8.从手机端下载文件到电脑
$ adb pull /sdcard/capture.pcap d:/
9.在电脑上用wireshark打开capture.pcap即可分析log.
如果需要执行包过滤，只抓取得某些类型的报文，可以参考下面的介绍。
Execute the following if you would like to watch packets go by rather than capturing them to a file (-n skips DNS lookups. -s 0 captures the entire packet rather than just the header):
$ adb shell tcpdump -n -s 0
Typical tcpdump options apply. For example, if you want to see HTTP traffic:
$ adb shell tcpdump -X -n -s 0 port 80
根据以上的信息，写一个bat去执行（tcpdump文件必须在当前目录里）。
开始tcpdump
$ adb push tcpdump /data/local/tcpdump $ adb shell chmod 6755 /data/local/tcpdump $ adb shell rm -r /sdcard/capture.pcap $ adb shell /data/local/tcpdump -i any -p -s 0 -w /sdcard/capture.pcap $ pause
下载tcpdump文件到电脑
$ adb pull /sdcard/capture.pcap capture.pcap
问题：有些机器root后通过adb shell 后，默认不是root用户，需要输入 su才能切换到root，这样在执行批处理会有问题，解决方法如下
$ adb shell "su -c 'sleep 1'" $ adb start-server $ adb push tcpdump /data/local/tcpdump
因没有root权限导致的问题
$ adb shell su -c "/data/local/tmp/tcpdump -i any -p -s 0 -w /sdcard/netCapture.pcap"