![]() it's the last thing packets encounter before leaving the device. Layer 2 is just above the Physical Layer i.e. The above described shortcomings of a Layer 2 tool can be mitigated using iptables LOG or NFLOG. NetHogs traverses procfs and copes with the above limitations (though not always very successful): ![]() Remote shared sockets such as UDP/53 which is used for DNS resolution cannot be tracked for a single process. There is - though rare - possibility that local sockets are being shared by multiple processes on UNIX-like OS's.Keeping track of continuously changing sockets is almost impossible particularly when there are a large number of apps accessing network simultaneously. Apps keep on creating and deleting sockets.So we have to capture traffic from all processes. Android apps usually launch more than one process at a time in parallel i.e.However there are some issues with this approach: Similarly a remote socket (if not connected to by multiple apps) can also be used for filtering results. Once we know what sockets are being used by an app (UID), tcpdump -i wlan0 src and port will dump the whole traffic originated from that process. This will provide Local Address (socket) being used by a process. Android app Netstat Plus works on same principle. UID information can also be directly read from /proc/net/. Both tools are available on Android (or you can get a static binary), ss is the newer one. netstat -tup or ss -tup will show all network sockets with active/established connections. So what we can do here is to make use of network sockets (combination of IP and port) being created and used by an app. However UID info is not propagated through the AF_PACKET/ PF_PACKET channel that pcap uses at OSI Layer 2. Android app Network Utilities and others also make use of tcpdump. Some popular utilities that use libpcap include tcpdump, nmap, tshark/wireshark, dumpcap, nethogs etc. It supports BSD Packet Filter (BPF) for in-kernel packet filtering. Now how we can capture network traffic? Most of the network sniffers use libpcap family of system-independent libraries for this purpose. So we can capture packets sent by a specific UID over the network interfaces to track the usage. ![]() Proposals and abandoned projects do exist.Īndroid assigns a unique UID to every installed app just like every human user on Linux has a UID. Or refer to this answer for a logcat/ dumpsys based solution.įirst of all, tracking a UID or PID of a network stream isn't straight forward because these aren't network related but OS related parameters. Using VPN or Android stats based apps is the only possible non-root solution. If you have rooted phone, go for nethogs (for live monitoring) or iptables (to get statistics) commandline tools. ![]()
0 Comments
Leave a Reply. |