def extreu_ip(linia, ip):
    f = 'from'
    r = 'rhost='
    ifrom = linia.find(f)
    irhost = linia.find(r)
    if ifrom != -1:
        p = 'port'
        iport = linia.find(p)
        ip_linia = linia[ifrom + len(f) + 1:iport - 1]
    elif irhost != -1:
        ip_linia = linia[irhost + len(r):].strip()
    else:
        ip_linia = ''
    if ip_linia != '':
        linia_r = linia.replace(ip_linia, ip)
    else:
        linia_r = linia
    return ip_linia, linia_r