#!/usr/bin/env bpftrace
/*
* tcpconnect.bt Trace TCP connect()s.
* For Linux, uses bpftrace and eBPF.
*
* USAGE: tcpconnect.bt
*
* This is a bpftrace version of the bcc tool of the same name.
*
* All connection attempts are traced, even if they ultimately fail.
*
* This uses dynamic tracing of kernel functions, and will need to be updated
* to match kernel changes.
*
* Copyright (c) 2018 Dale Hamel.
* Licensed under the Apache License, Version 2.0 (the "License")
*
* 23-Nov-2018 Dale Hamel created this.
*/
#ifndef BPFTRACE_HAVE_BTF
#include <linux/socket.h>
#include <net/sock.h>
#else
#include <sys/socket.h>
#endif
BEGIN
{
printf("Tracing tcp connections. Hit Ctrl-C to end.\n");
printf("%-8s %-8s %-16s ", "TIME", "PID", "COMM");
printf("%-39s %-6s %-39s %-6s\n", "SADDR", "SPORT", "DADDR", "DPORT");
}
kprobe:tcp_connect
{
$sk = ((struct sock *) arg0);
$inet_family = $sk->__sk_common.skc_family;
if ($inet_family == AF_INET || $inet_family == AF_INET6) {
if ($inet_family == AF_INET) {
$daddr = ntop($sk->__sk_common.skc_daddr);
$saddr = ntop($sk->__sk_common.skc_rcv_saddr);
} else {
$daddr = ntop($sk->__sk_common.skc_v6_daddr.in6_u.u6_addr8);
$saddr = ntop($sk->__sk_common.skc_v6_rcv_saddr.in6_u.u6_addr8);
}
$lport = $sk->__sk_common.skc_num;
$dport = $sk->__sk_common.skc_dport;
// Destination port is big endian, it must be flipped
$dport = bswap($dport);
time("%H:%M:%S ");
printf("%-8d %-16s ", pid, comm);
printf("%-39s %-6d %-39s %-6d\n", $saddr, $lport, $daddr, $dport);
}
}
Mini Shell