def parse(self):
if self._file is None:
print "Error : PcapReader : Open a file before using parse"
return
if self._packets:
self._packets[:] = []
# Parsing du fichier via dpkt
pcap = dpkt.pcap.Reader(self._file)
for ts, buf in pcap:
# Parsing des donnees du paquet
eth = dpkt.ethernet.Ethernet(buf)
# On ne traite que les paquets IP
if eth.type != dpkt.ethernet.ETH_TYPE_IP:
continue
packet = Packet(buf)
# Recuperation des donnees de la couche ethernet
eth_layer = {}
eth_layer['LayerType'] = "Ethernet"
# Un header ethernet fait 14 bytes (2 * 6 bytes d'addresses MAC + l'ethertype ou la taille du payload (2 bytes))
eth_layer['Header length'] = 14
eth_layer['Type'] = socket.ntohs(eth.type)
eth_layer['Destination MAC'] = network_utils.eth_addr(eth.dst)
eth_layer['Source MAC'] = network_utils.eth_addr(eth.src)
packet.add_layer(eth_layer)
ip = eth.data
ip_layer = {}
# Recuperation des donnees de la couche ip
ip_layer['LayerType'] = 'IP'
ip_layer['Version'] = ip.v
ip_layer['Header length'] = ip.hl
ip_layer['TTL'] = ip.ttl
ip_layer['Protocol'] = ip.p
# on converti les adresses IP binaire en leur notation string
ip_layer['Source Address'] = socket.inet_ntop(socket.AF_INET, ip.src)
ip_layer['Destination Address'] = socket.inet_ntop(socket.AF_INET, ip.dst)
# On rajoute la couche IP recuperee au paquet
packet.add_layer(ip_layer)
# TCP protocol
if ip.p == dpkt.ip.IP_PROTO_TCP:
tcp = ip.data
# Recuperation des donnees de la couche TCP
tcp_layer = {}
tcp_layer['LayerType'] = 'TCP'
tcp_layer['Source port'] = tcp.sport
tcp_layer['Destination port'] = tcp.dport
tcp_layer['Sequence'] = tcp.seq
tcp_layer['Acknowledgement'] = tcp.ack
tcp_layer['Header length'] = tcp.off
tcp_layer['Data'] = tcp.data
# On rajoute la couche TCP recuperee au paquet
packet.add_layer(tcp_layer)
# ICMP protocol
elif ip.p == dpkt.ip.IP_PROTO_ICMP:
icmp = ip.data
# Recuperation des donnees de la couche ICMP
icmp_layer = {}
icmp_layer['LayerType'] = 'ICMP'
icmp_layer['Type'] = icmp.type
icmp_layer['Code'] = icmp.code
icmp_layer['Checksum'] = icmp.sum
icmp_layer['Data'] = icmp.data
# On rajoute la couche ICMP recuperee au paquet
packet.add_layer(icmp_layer)
# UDP protocol
elif ip.p == dpkt.ip.IP_PROTO_UDP:
udp = ip.data
# Recuperation des donnees de la couche UDP
udp_layer = {}
udp_layer['LayerType'] = 'UDP'
udp_layer['Source port'] = udp.sport
udp_layer['Destination port'] = udp.dport
udp_layer['Length'] = udp.ulen
udp_layer['Checksum'] = udp.sum
udp_layer['Data'] = udp.data
# On rajoute la couche UDP recuperee au paquet
packet.add_layer(udp_layer)
self._packets.append(packet)
self.close_file()
class Capture(Thread):
""" Classe pour capturer les paquets sur le reseau
elle utilise un thread pour ne pas couper l'execution de la GUI et autres features
on lance la capture on utilisant .start() et on la stope avec .stopCapture()
les resultats de la capture seront dans .result() """
def __init__(self):
super(Capture, self).__init__()
self._result = []
self.shutdown = False
def result():
doc = "Le resultat de la capture."
def fget(self):
return self._result
def fset(self, value):
print('This should not be done. Use start to launch a capture')
def fdel(self):
del self._result
return locals()
result = property(**result())
def stopCapture(self):
print 'Stopping capture'
self.shutdown = True
def run(self):
# On s'assure que la capture n'est pas arretee des le lancement
self.shutdown = False
# creation du socket (0x0003 est defini comme etant ETH_P_ALL en C, tout les paquets ethernet)
try:
sock = socket.socket(socket.AF_PACKET, socket.SOCK_RAW,
socket.ntohs(0x0003))
except socket.error, msg:
print 'Error : Socket could not be created [' + str(
msg[0]) + '] : ' + msg[1]
self.shutdown = True
print 'Starting packet capture'
# Boucle de capture
while not self.shutdown:
sockPacket = sock.recvfrom(65565)
# on recupere uniquement la string
sockPacket = sockPacket[0]
packetToAdd = packet.Packet(sockPacket)
# Layer a add dans packetToAdd
eth_layer = {}
eth_layer['LayerType'] = "Ethernet"
# normalement un header ethernet fait 14 bytes (2 * 6 bytes d'addresses MAC + l'ethertype ou la taille du payload (2 bytes))
eth_length = 14
eth_layer['Header length'] = eth_length
eth_header = sockPacket[:eth_length]
# on parse la struct C du header
# ! pour le big endian (reseau) / H unsigned short / s string
eth = unpack('!6s6sH', eth_header)
# on recupere le protocole (ntohs fait la conversion d'Int des bits reseau au bits machine (si differents))
eth_protocol = socket.ntohs(eth[2])
eth_layer['Type'] = eth_protocol
eth_layer['Destination MAC'] = network_utils.eth_addr(
sockPacket[0:6])
eth_layer['Source MAC'] = network_utils.eth_addr(sockPacket[6:12])
# On rajoute la couche Ethernet recuperee dans le paquet a ajouter au resultat
packetToAdd.add_layer(eth_layer)
# Parsing des paquets IP (IP Protocol number = 8)
if eth_protocol == 8:
# Layer a add dans packetToAdd
ip_layer = {}
ip_layer['LayerType'] = 'IP'
# le header IP est sur les 20 premiers bytes apres le header Ethernet
ip_header = sockPacket[eth_length:eth_length + 20]
# on parse la struct C du header IP
# ! pour le big endian (reseau) / B unsigned char / H unsigned short / s string
iph = unpack('!2B3H2BH4s4s', ip_header)
# le premier octet contient la version et la taille du header (RFC 791)
version_ihl = iph[0]
# on recupere la version sur les 4 premiers bits
ip_layer['Version'] = version_ihl >> 4
# et la taille du header sur les 4 suivants
ihl = version_ihl & 0xF
# la taille de IHL est en multiple de 4 (convention)
iph_length = ihl * 4
ip_layer['Header length'] = iph_length
ip_layer['TTL'] = iph[5]
protocol = iph[6]
ip_layer['Protocol'] = protocol
# on converti les adresses IP binaire en leur notation string
ip_layer['Source Address'] = socket.inet_ntop(
socket.AF_INET, iph[8])
ip_layer['Destination Address'] = socket.inet_ntop(
socket.AF_INET, iph[9])
# On rajoute la couche IP recuperee au paquet a rajouter au resultat
packetToAdd.add_layer(ip_layer)
# TCP Protocol ( == 6)
if protocol == 6:
tcp_layer = {}
tcp_layer['LayerType'] = 'TCP'
# on recupere le header tcp (20 bytes apres le header IP)
tcp_header = sockPacket[eth_length +
iph_length:eth_length +
iph_length + 20]
# on parse la struct C du header tcp
# ! big endian (reseau) / H unsigned short / L unsigned long / B unsigned char
tcph = unpack('!2H2L2B3H', tcp_header)
tcp_layer['Source port'] = tcph[0]
tcp_layer['Destination port'] = tcph[1]
tcp_layer['Sequence'] = tcph[2]
tcp_layer['Acknowledgement'] = tcph[3]
doff_reserved = tcph[4]
tcph_length = doff_reserved >> 4
tcp_layer['Header length'] = tcph_length * 4
# on add la taille des header pour trouver le debut des data
h_size = eth_length + iph_length + tcph_length * 4
data_size = len(sockPacket) - h_size
data = sockPacket[h_size:]
tcp_layer['Data'] = data
# On rajoute la couche TCP recuperee au paquet a rajouter au resultat
packetToAdd.add_layer(tcp_layer)
#ICMP Protocl (== 1) ce protocole sert a vehiculer les messages d'erreur sur le re"seau
elif protocol == 1:
icmp_layer = {}
icmp_layer['LayerType'] = 'ICMP'
u = iph_length + eth_length
icmph_length = 4
icmp_header = sockPacket[u:u + 4]
icmph = unpack('!BBH', icmp_header)
icmp_layer['Type'] = icmph[0]
icmp_layer['Code'] = icmph[1]
icmp_layer['Checksum'] = icmph[2]
h_size = eth_length + iph_length + icmph_length
data_size = len(sockPacket) - h_size
data = sockPacket[h_size:]
icmp_layer['Data'] = data
# On rajoute la couche ICMP recuperee au paquet a rajouter au resultat
packetToAdd.add_layer(icmp_layer)
#UDP protocol
elif protocol == 17:
udp_layer = {}
udp_layer['LayerType'] = 'UDP'
u = iph_length + eth_length
udph_length = 8
udp_header = sockPacket[u:u + 8]
udph = unpack('!HHHH', udp_header)
udp_layer['Source port'] = udph[0]
udp_layer['Destination port'] = udph[1]
udp_layer['Length'] = udph[2]
udp_layer['Checksum'] = udph[3]
h_size = eth_length + iph_length + udph_length
data_size = len(sockPacket) - h_size
data = sockPacket[h_size:]
udp_layer['Data'] = data
# On rajoute la couche UDP recuperee au paquet a rajouter au resultat
packetToAdd.add_layer(udp_layer)
#On rajoute le paquet au resultat de la capture
self._result.append(packetToAdd)
# Sortie de boucle, la capture a ete arretee
# On nettoie
sock.close()
print 'The capture thread is stopping'
def parseRaw(self):
# Layer a add dans layers
eth_layer = {}
eth_layer['LayerType'] = "Ethernet"
# normalement un header ethernet fait 14 bytes (2 * 6 bytes d'addresses MAC + l'ethertype ou la taille du payload (2 bytes))
eth_length = 14
eth_layer['Header length'] = eth_length
eth_header = self._packet[:eth_length]
# on parse la struct C du header
# ! pour le big endian (reseau) / H unsigned short / s string
eth = unpack('!6s6sH' , eth_header)
# on recupere le protocole (ntohs fait la conversion d'Int des bits reseau au bits machine (si differents))
eth_protocol = socket.ntohs(eth[2])
eth_layer['Type'] = eth_protocol
eth_layer['Destination MAC'] = network_utils.eth_addr(self._packet[0:6])
eth_layer['Source MAC'] = network_utils.eth_addr(self._packet[6:12])
eth_layer['Checksum'] = self._packet[-2:]
# On rajoute la couche Ethernet recuperee dans le paquet a ajouter au resultat
self.add_layer(eth_layer)
# Parsing des paquets IP (IP Protocol number = 8)
if eth_protocol == 8 :
# Layer a add dans self
ip_layer = {}
ip_layer['LayerType'] = 'IP'
# le header IP est sur les 20 premiers bytes apres le header Ethernet
ip_header = self._packet[eth_length:eth_length+20]
# on parse la struct C du header IP
# ! pour le big endian (reseau) / B unsigned char / H unsigned short / s string
iph = unpack('!2B3H2BH4s4s', ip_header)
# le premier octet contient la version et la taille du header (RFC 791)
version_ihl = iph[0]
# on recupere la version sur les 4 premiers bits
ip_layer['Version'] = version_ihl >> 4
# et la taille du header sur les 4 suivants
ihl = version_ihl & 0xF
# la taille de IHL est en multiple de 4 (convention)
iph_length = ihl * 4
ip_layer['Header length'] = iph_length
ip_layer['TTL'] = iph[5]
protocol = iph[6]
ip_layer['Protocol'] = protocol
# on converti les adresses IP binaire en leur notation string
ip_layer['Source Address'] = socket.inet_ntop(socket.AF_INET, iph[8]);
ip_layer['Destination Address'] = socket.inet_ntop(socket.AF_INET, iph[9]);
# On rajoute la couche IP recuperee au paquet a rajouter au resultat
self.add_layer(ip_layer)
# TCP Protocol ( == 6)
if protocol == 6 :
tcp_layer = {}
tcp_layer['LayerType'] = 'TCP'
# on recupere le header tcp (20 bytes apres le header IP)
tcp_header = self._packet[eth_length + iph_length:eth_length + iph_length + 20]
# on parse la struct C du header tcp
# ! big endian (reseau) / H unsigned short / L unsigned long / B unsigned char
tcph = unpack('!2H2L2B3H', tcp_header)
tcp_layer['Source port'] = tcph[0]
tcp_layer['Destination port'] = tcph[1]
tcp_layer['Sequence'] = tcph[2]
tcp_layer['Acknowledgement'] = tcph[3]
doff_reserved = tcph[4]
tcph_length = doff_reserved >> 4
tcp_layer['Header length'] = tcph_length * 4
# on add la taille des header pour trouver le debut des data
h_size = eth_length + iph_length + tcph_length * 4
data_size = len(self._packet) - h_size - 2
data = self._packet[h_size:h_size+data_size]
tcp_layer['Data'] = data
# On rajoute la couche TCP recuperee au paquet a rajouter au resultat
self.add_layer(tcp_layer)
#ICMP Protocl (== 1) ce protocole sert a vehiculer les messages d'erreur sur le re"seau
elif protocol == 1 :
icmp_layer = {}
icmp_layer['LayerType'] = 'ICMP'
u = iph_length + eth_length
icmph_length = 4
icmp_header = self._packet[u:u+4]
icmph = unpack('!BBH' , icmp_header)
icmp_layer['Type'] = icmph[0]
icmp_layer['Code'] = icmph[1]
icmp_layer['Checksum'] = icmph[2]
h_size = eth_length + iph_length + icmph_length
data_size = len(self._packet) - h_size - 2
data = self._packet[h_size:h_size+data_size]
icmp_layer['Data'] = data
# On rajoute la couche ICMP recuperee au paquet a rajouter au resultat
self.add_layer(icmp_layer)
#UDP protocol
elif protocol == 17 :
udp_layer = {}
udp_layer['LayerType'] = 'UDP'
u = iph_length + eth_length
udph_length = 8
udp_header = self._packet[u:u+8]
udph = unpack('!HHHH' , udp_header)
udp_layer['Source port'] = udph[0]
udp_layer['Destination port'] = udph[1]
udp_layer['Length'] = udph[2]
udp_layer['Checksum'] = udph[3]
h_size = eth_length + iph_length + udph_length
data_size = len(self._packet) - h_size - 2
data = self._packet[h_size:h_size+data_size]
udp_layer['Data'] = data
# On rajoute la couche UDP recuperee au paquet a rajouter au resultat
self.add_layer(udp_layer)
