Get TCP/UDP Tables in Linux

Question

Is there a way to get a list of tcp, udp connections and processes they are associated with?

I did this in windows by using "GetExtendedTcpTable()" and "GetExtendedUdpTable()" And i want to achieve the same thing in linux.

Can someone help?

thank you.

Answer 1

You can do stuff like this:

#include <fstream>
#include <iostream>

int main()
{
    std::ifstream tcp("/proc/net/tcp");

    std::string line;
    while(std::getline(tcp, line))
        std::cout << line << '\n';
}

To discover what other names are available try this at the command line:

ls -l /proc/net/

Not sure the best way to associate process id (pid) with sockets but you can cross reference /proc/<pid>/fd , where <pid> is the actual number, with /proc/net/tcp .