How to capture all internet activity in linux?

Question

linux

There is one project that works on the basis of several open source projects, is managed through a web interface. I would like to know if he sends data somewhere to third parties (for example, developers, Obama, mother-in-law) and which ones. Those. I would like to run some utility, daemon or script, start installing the project, work in it, and then see what exactly happened and what went where, to which IPs. How and how can this be checked? How can you exclude the activity of other applications or determine that it is this project that sends the data, and not some other Trojan?

Answer 1

Wireshark, tcpdump will help you analyze network activity. What files your utility "touches" and what calls it makes can be checked with strace and ltrace.