def print_packets(pcap):
"""Print out information about each packet in a pcap
Args:
pcap: dpkt pcap reader object (dpkt.pcap.Reader)
"""
# For each packet in the pcap process the contents
for timestamp, buf in pcap:
# Print out the timestamp in UTC
print('Timestamp: ', str(datetime.datetime.utcfromtimestamp(timestamp)))
# Unpack the Ethernet frame (mac src/dst, ethertype)
eth = dpkt.ethernet.Ethernet(buf)
print('Ethernet Frame: ', mac_to_str(eth.src), mac_to_str(eth.dst), eth.type)
# Make sure the Ethernet data contains an IP packet
if not isinstance(eth.data, dpkt.ip.IP):
print('Non IP Packet type not supported %s\n' % eth.data.__class__.__name__)
continue
# Now access the data within the Ethernet frame (the IP packet)
# Pulling out src, dst, length, fragment info, TTL, and Protocol
ip = eth.data
# Print out the info, including the fragment flags and offset
print('IP: %s -> %s (len=%d ttl=%d DF=%d MF=%d offset=%d)\n' %
(inet_to_str(ip.src), inet_to_str(ip.dst), ip.len, ip.ttl, ip.df, ip.mf, ip.offset))
# Pretty print the last packet
print('** Pretty print demo **\n')
eth.pprint()
def print_packets(pcap):
"""Print out information about each packet in a pcap
Args:
pcap: dpkt pcap reader object (dpkt.pcap.Reader)
"""
# For each packet in the pcap process the contents
for timestamp, buf in pcap:
# Print out the timestamp in UTC
print('Timestamp: ', str(datetime.datetime.utcfromtimestamp(timestamp)))
# Unpack the Ethernet frame (mac src/dst, ethertype)
eth = dpkt.ethernet.Ethernet(buf)
print('Ethernet Frame: ', mac_to_str(eth.src), mac_to_str(eth.dst), eth.type)
# Make sure the Ethernet data contains an IP packet
if not isinstance(eth.data, dpkt.ip.IP):
print('Non IP Packet type not supported %s\n' % eth.data.__class__.__name__)
continue
# Now unpack the data within the Ethernet frame (the IP packet)
# Pulling out src, dst, length, fragment info, TTL, and Protocol
ip = eth.data
# Pull out fragment information (flags and offset all packed into off field, so use bitmasks)
do_not_fragment = bool(ip.off & dpkt.ip.IP_DF)
more_fragments = bool(ip.off & dpkt.ip.IP_MF)
fragment_offset = ip.off & dpkt.ip.IP_OFFMASK
# Print out the info
print('IP: %s -> %s (len=%d ttl=%d DF=%d MF=%d offset=%d)\n' %
(inet_to_str(ip.src), inet_to_str(ip.dst), ip.len, ip.ttl,
do_not_fragment, more_fragments, fragment_offset))
def print_http_requests(pcap):
"""Print out information about each packet in a pcap
Args:
pcap: dpkt pcap reader object (dpkt.pcap.Reader)
"""
# For each packet in the pcap process the contents
for timestamp, buf in pcap:
# Unpack the Ethernet frame (mac src/dst, ethertype)
eth = dpkt.ethernet.Ethernet(buf)
# Make sure the Ethernet data contains an IP packet
if not isinstance(eth.data, dpkt.ip.IP):
print('Non IP Packet type not supported %s\n' %
eth.data.__class__.__name__)
continue
# Now grab the data within the Ethernet frame (the IP packet)
ip = eth.data
# Check for TCP in the transport layer
if isinstance(ip.data, dpkt.tcp.TCP):
# Set the TCP data
tcp = ip.data
# Now see if we can parse the contents as a HTTP request
try:
request = dpkt.http.Request(tcp.data)
except (dpkt.dpkt.NeedData, dpkt.dpkt.UnpackError):
continue
# Pull out fragment information (flags and offset all packed into off field, so use bitmasks)
do_not_fragment = bool(ip.off & dpkt.ip.IP_DF)
more_fragments = bool(ip.off & dpkt.ip.IP_MF)
fragment_offset = ip.off & dpkt.ip.IP_OFFMASK
# Print out the info
print('Timestamp: ',
str(datetime.datetime.utcfromtimestamp(timestamp)))
print('Ethernet Frame: ', mac_to_str(eth.src), mac_to_str(eth.dst),
eth.type)
print('IP: %s -> %s (len=%d ttl=%d DF=%d MF=%d offset=%d)' %
(inet_to_str(ip.src), inet_to_str(ip.dst), ip.len, ip.ttl,
do_not_fragment, more_fragments, fragment_offset))
print('HTTP request: %s\n' % repr(request))
# Check for Header spanning acrossed TCP segments
if not tcp.data.endswith(b'\r\n'):
print('\nHEADER TRUNCATED! Reassemble TCP segments!\n')
def print_icmp(pcap):
"""Print out information about each packet in a pcap
Args:
pcap: dpkt pcap reader object (dpkt.pcap.Reader)
"""
# For each packet in the pcap process the contents
for timestamp, buf in pcap:
# Unpack the Ethernet frame (mac src/dst, ethertype)
eth = dpkt.ethernet.Ethernet(buf)
# Make sure the Ethernet data contains an IP packet
if not isinstance(eth.data, dpkt.ip.IP):
print('Non IP Packet type not supported %s\n' %
eth.data.__class__.__name__)
continue
# Now grab the data within the Ethernet frame (the IP packet)
ip = eth.data
# Now check if this is an ICMP packet
if isinstance(ip.data, dpkt.icmp.ICMP):
icmp = ip.data
# Pull out fragment information (flags and offset all packed into off field, so use bitmasks)
do_not_fragment = bool(ip.off & dpkt.ip.IP_DF)
more_fragments = bool(ip.off & dpkt.ip.IP_MF)
fragment_offset = ip.off & dpkt.ip.IP_OFFMASK
# Print out the info
print('Timestamp: ',
str(datetime.datetime.utcfromtimestamp(timestamp)))
print('Ethernet Frame: ', mac_to_str(eth.src), mac_to_str(eth.dst),
eth.type)
print('IP: %s -> %s (len=%d ttl=%d DF=%d MF=%d offset=%d)' %
(inet_to_str(ip.src), inet_to_str(ip.dst), ip.len, ip.ttl,
do_not_fragment, more_fragments, fragment_offset))
print('ICMP: type:%d code:%d checksum:%d data: %s\n' %
(icmp.type, icmp.code, icmp.sum, repr(icmp.data)))
def print_icmp(pcap):
for timestamp, buf in pcap:
eth = dpkt.ethernet.Ethernet(buf)
if not isinstance(eth.data, dpkt.ip.IP):
print('Non IP Packet type not supported %s\n' %
eth.data.__class__.__name__)
continue
ip = eth.data
if isinstance(ip.data, dpkt.icmp.ICMP):
icmp = ip.data
do_not_fragment = bool(ip.off & dpkt.ip.IP_DF)
more_fragments = bool(ip.off & dpkt.ip.IP_MF)
fragment_offset = ip.off & dpkt.ip.IP_OFFMASK
print('Timestamp: ',
str(datetime.datetime.utcfromtimestamp(timestamp)))
print('Ethernet Frame: ', mac_to_str(eth.src), mac_to_str(eth.dst),
eth.type)
print('IP: %s -> %s (len=%d ttl=%d DF=%d MF=%d offset=%d)' %
(inet_to_str(ip.src), inet_to_str(ip.dst), ip.len, ip.ttl,
do_not_fragment, more_fragments, fragment_offset))
def print_packets(pcap):
"""Print out information about each packet in a pcap
Args:
pcap: dpkt pcap reader object (dpkt.pcap.Reader)
"""
# For each packet in the pcap process the contents
for timestamp, buf in pcap:
# Print out the timestamp in UTC
print('Timestamp: ',
str(datetime.datetime.utcfromtimestamp(timestamp)))
# Unpack the Ethernet frame (mac src/dst, ethertype)
eth = dpkt.ethernet.Ethernet(buf)
print('Ethernet Frame: ', mac_to_str(eth.src), mac_to_str(eth.dst),
eth.type)
# Make sure the Ethernet data contains an IP packet
if not isinstance(eth.data, dpkt.ip.IP):
print('Non IP Packet type not supported %s\n' %
eth.data.__class__.__name__)
continue
# Now unpack the data within the Ethernet frame (the IP packet)
# Pulling out src, dst, length, fragment info, TTL, and Protocol
ip = eth.data
# Pull out fragment information (flags and offset all packed into off field, so use bitmasks)
do_not_fragment = bool(ip.off & dpkt.ip.IP_DF)
more_fragments = bool(ip.off & dpkt.ip.IP_MF)
fragment_offset = ip.off & dpkt.ip.IP_OFFMASK
# Print out the info
print('IP: %s -> %s (len=%d ttl=%d DF=%d MF=%d offset=%d)' %
(inet_to_str(ip.src), inet_to_str(ip.dst), ip.len, ip.ttl,
do_not_fragment, more_fragments, fragment_offset))
# Check for UDP in the transport layer
if isinstance(ip.data, dpkt.udp.UDP):
# Set the UDP data
udp = ip.data
print('UDP: sport={:d} dport={:d} sum={:d} ulen={:d}'.format(
udp.sport, udp.dport, udp.sum, udp.ulen))
# Now see if we can parse the contents of the trucated DNS request
try:
dns = dpkt.dns.DNS()
dns.unpack(udp.data)
except (dpkt.dpkt.NeedData, dpkt.dpkt.UnpackError, Exception) as e:
print('\nError Parsing DNS, Might be a truncated packet...')
print('Exception: {!r}'.format(e))
# Print out the DNS info
print('Queries: {:d}'.format(len(dns.qd)))
for query in dns.qd:
print('\t {:s} Type:{:d}'.format(query.name, query.type))
print('Answers: {:d}'.format(len(dns.an)))
for answer in dns.an:
if answer.type == 5:
print('\t {:s}: type: CNAME Answer: {:s}'.format(
answer.name, answer.cname))
elif answer.type == 1:
print('\t {:s}: type: A Answer: {:s}'.format(
answer.name, inet_to_str(answer.ip)))
else:
pprint(make_dict(answer))
