Created
March 19, 2016 09:05
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iftop like report from a pcap
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import dpkt | |
import humanfriendly | |
import nids | |
import pandas as pd | |
import socket | |
import sys | |
conv = {} | |
ip_to_domain = {} | |
end_states = (nids.NIDS_CLOSE, nids.NIDS_TIMEOUT, nids.NIDS_RESET) | |
def handle_tcp_stream(tcp): | |
ports = [80, 443] | |
if tcp.addr[1][1] not in ports: | |
return | |
global conv | |
if tcp.nids_state == nids.NIDS_JUST_EST: | |
tcp.client.collect = 1 | |
tcp.server.collect = 1 | |
elif tcp.nids_state == nids.NIDS_DATA: | |
tcp.discard(0) | |
elif tcp.nids_state in end_states: | |
ip = tcp.addr[1][0] | |
conv.setdefault(ip, 0) | |
conv[ip] += len(tcp.client.data[:tcp.client.count]) + len(tcp.server.data[:tcp.server.count]) | |
def udp_callback(addrs, payload, pkt): | |
if addrs[0][1] != 53: | |
return | |
dns = dpkt.dns.DNS(payload) | |
global ip_to_domain | |
for q in dns.qd: | |
domain = q.name | |
for a in dns.an: | |
try: | |
ip_to_domain[socket.inet_ntoa(a.ip)] = domain | |
except AttributeError: | |
pass | |
return | |
def extract(pcap_file): | |
nids.param("tcp_workarounds", 1) | |
nids.param("scan_num_hosts", 0) # disable portscan detection | |
nids.chksum_ctl([('0.0.0.0/0', False)]) # disable checksumming | |
nids.param("filename", pcap_file) | |
nids.init() | |
nids.register_tcp(handle_tcp_stream) | |
nids.register_udp(udp_callback) | |
try: | |
nids.run() | |
except Exception, e: | |
print "Exception ", pcap_file + " ", e | |
data = [] | |
columns = ('name', 'bytes', 'human_bytes') | |
for ip, byte in conv.iteritems(): | |
name = ip_to_domain[ip] if ip in ip_to_domain else ip | |
data.append([name, byte, humanfriendly.format_size(byte)]) | |
df = pd.DataFrame(data, columns=columns) | |
df = df.sort('bytes', ascending=False) | |
return df | |
if __name__ == "__main__": | |
print extract(sys.argv[1]) |
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