Gonna dump my own shit in here. Maybe someone would ever need that.
An AWK script to check TOR bridges.
Expects ip as the third field, change $3 to $2 if IP is the second.

BEGIN
{
    srand();
}

{
    split($3, host, ":");
    bytes = int(rand() * 10) + 1;
    data = ("dd if=/dev/urandom bs=1 count=" bytes " 2>/dev/null");
    r = system(data "|nc " host[1] " " host[2]);
    if (! r) print;
}