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#!/usr/bin/stap

# Print a trace of threads sending IP packets (UDP or TCP) to a given
# destination port and/or address.  Default is unfiltered.

global the_dport = 0    # override with -G the_dport=53
global the_daddr = ""   # override with -G the_daddr=127.0.0.1

probe netfilter.ip.local_out {
    if ((the_dport == 0 || the_dport == dport) &&
        (the_daddr == "" || the_daddr == daddr))
	    printf("%s[%d] sent packet to %s:%d\n", execname(), tid(), daddr, dport)
}