tcpv4connect_example.txt

Demonstrations of tcpv4connect.py, the Linux eBPF/bcc version.


This example traces the kernel function performing active TCP IPv4 connections
(eg, via a connect() syscall; accept() are passive connections). Some example
output (IP addresses changed to protect the innocent):

# ./tcpv4connect.py
PID    COMM         SADDR            DADDR            DPORT
1479   telnet       127.0.0.1        127.0.0.1        23  
1469   curl         10.201.219.236   54.245.105.25    80  
1469   curl         10.201.219.236   54.67.101.145    80  

This output shows three connections, one from a "telnet" process and two from
"curl". The output details shows the source address, destination address,
and destination port. This traces attempted connections: these may have failed.

The overhead of this tool should be negligible, since it is only tracing the
kernel function performing a connect. It is not tracing every packet and then
filtering.

This is provided as a basic example of TCP tracing. See tools/tcpconnect for a
more featured version of this example (a tool).