| 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). |
