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capture.py
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#-*- coding:utf-8 -*-
import sys
from socket import *
ETH_P_IP = 0x800
ETH_P_ARP = 0x806
ETH_P_ALL = 0x003
def main(interface, cap_packet_type):
#socket()を作成する
if cap_packet_type == "IP":
sock = socket(PF_PACKET, SOCK_RAW, ETH_P_IP)
sock.bind((interface, ETH_P_IP))
elif cap_packet_type == "ALL":
sock = socket(PF_PACKET, SOCK_RAW, ETH_P_ALL)
sock.bind((interface, ETH_P_ALL))
while True:
i = 0
j = 0
count = 1
packet = sock.recv(4096)
#packet_analyze(packet)
eth_analyze(packet)
packet = packet.hex()
print("[Binary]")
##show clear UI
for (i,j) in zip(packet[::2], packet[1::2]):
if count % 16 == 0 and count != 0:
print(i+j)
elif count % 8 == 0 and count % 16 != 0:
print(i+j, end="")
print(" ", end=" ")
else:
print(i+j, end=" ")
count += 1
print("")
print("")
def eth_analyze(packet):
#packet_length
packet_len = len(packet)
#Destination MAC Address
eth_dst = ":".join(["%02x" % x for x in packet[:6]])
#Source MAC Address
eth_src = ":".join(["%02x" % x for x in packet[6:12]])
#packetのデータを16進数化
packet = packet.hex()
#Ethernet Type
##EthernetHeaderのあとに何が続くかを示す
eth_type = packet[24:28]
#出力
print("[Ethernet Header]")
print("src:%s >>> dst:%s\nethertype:%s, length:%d" % (eth_src, eth_dst, eth_type , packet_len))
#eth_typeの結果からこれ以降が何かを判断して処理を投げる
if eth_type == "0800":
ip_analyze(packet)
elif eth_type == "0806":
arp_analyze(packet)
elif eth_type == "86DD":
ipv6_analyze(packet)
else:
print("このパケットのEthernetHeaderのtypeの数値が異常か対応していない数値です。\n確認してください")
print(type(eth_type))
def ip_analyze(packet):
#[IP_Header]
#IP version
ip_ver = packet[28]
if ip_ver == "4":
ip_ver = "IPv4"
elif ip_ver == "6":
ip_ver = "IPv6"
else:
print("IP_verがおかしいか対応していないバージョンです。¥n確認してください。")
#IP Header length
#ip_lengthは"変数*４"した数字が本来のバイト数となる(通信量節約のためそういう仕様らしい)
ip_head_len = packet[29]
ip_head_len = int(ip_head_len) *4
#Type of Service
ip_tos = packet[30:32]
#Total Length
ip_total_len = packet[32:36]
#Identification
ip_id = packet[36:40]
#Flags
ip_flag = packet[40]
#Flagment offset
ip_flag_offset = packet[41:44]
#TTL
ip_ttl = packet[44:46]
#Next_Header_Protocol
##[01:ICMP, 06:TCP, 17:UDP, else:not support protocol]
ip_protocol = packet[46:48]
#Header Checksum
ip_checksum = packet[48:52]
#Source IP Address
ip_src_oct1 = int(packet[52:54], 16)
ip_src_oct2 = int(packet[54:56], 16)
ip_src_oct3 = int(packet[56:58], 16)
ip_src_oct4 = int(packet[58:60], 16)
#Destination IP Address
ip_dst_oct1 = int(packet[60:62], 16)
ip_dst_oct2 = int(packet[62:64], 16)
ip_dst_oct3 = int(packet[64:66], 16)
ip_dst_oct4 = int(packet[66:68], 16)
#出力
print("[IP Header]")
print("ver:%s, head_length:%dByte, ToS:%s" % (ip_ver, ip_head_len, ip_tos))
print("total_length:%s, identification:%s" % (ip_total_len, ip_id))
print("flags:%s, flagment_offset:%s" % (ip_flag, ip_flag_offset))
print("TTL:%s, Next_Header_Protocol:%s, Checksum:%s" % (ip_ttl, ip_protocol, ip_checksum))
print("src:%s.%s.%s.%s >>> dst:%s.%s.%s.%s" % (ip_src_oct1, ip_src_oct2, ip_src_oct3, ip_src_oct4, ip_dst_oct1, ip_dst_oct2, ip_dst_oct3, ip_dst_oct4))
#ip_protocol毎に行う処理
##[01:ICMP, 06:TCP, 17:UDP, else:not support protocol]
if ip_protocol == "01":
icmp_analyze(packet)
elif ip_protocol == "06":
tcp_analyze(packet)
elif ip_protocol == "17":
udp_analyze(packet)
else:
print("not support Layer4 protocol.\nごめんなさい！")
def arp_analyze(packet):
arp_hard_type = packet[28:32]
arp_protocol_type = packet[32:36]
arp_hard_size = packet[36:38]
arp_protocol_size = packet[38:40]
arp_operation = packet[40:44]
#ARP_Ethernet_Source
arp_eth_src = ""
count = 0
for x, y in zip(packet[44:55:2], packet[45:56:2]):
arp_eth_src += x + y
count += 1
if count != 6:
arp_eth_src += ":"
#ARP_IP_Source
arp_ip_src = ""
count = 0
for x, y in zip(packet[56:63:2], packet[57:64:2]):
arp_ip_src += str(int(x+y, 16))
count += 1
if count != 4:
arp_ip_src += "."
#ARP_Ethernet_Destination
arp_eth_dst = ""
count = 0
for x, y in zip(packet[64:75:2], packet[65:76:2]):
arp_eth_dst += x + y
count += 1
if count != 6:
arp_eth_dst += ":"
#ARP_IP_Destination
arp_ip_dst = ""
count = 0
for x, y in zip(packet[76:83:2], packet[77:84:2]):
arp_ip_dst += str(int(x+y, 16))
count += 1
if count != 4:
arp_ip_dst += "."
print("[ARP Header]")
print("HardType:%s, ProtocolType:%s, HardSize:%s" % (arp_hard_type, arp_protocol_type, arp_hard_size, ))
print("ProtocolSize:%s, OperationCode:%s" % (arp_protocol_size, arp_operation))
print("eth_src:%s" % (arp_eth_src))
print("eth_dst:%s" % (arp_eth_dst))
print("ip_src:%s" % (arp_ip_src))
print("ip_dst:%s" % (arp_ip_dst))
def ipv6_analyze(packet):
print("ipv6解析は現在工事中！\nごめんなさい！")
def icmp_analyze(packet):
#icmp_type
icmp_type = packet[68:70]
#icmp_code
icmp_code = packet[70:72]
#icmp_checksum
icmp_checksum = packet[72:76]
#icmp_id
icmp_id = packet[76:80]
#icmp_seq
icmp_seq = packet[80:84]
#icmp_data
icmp_data = packet[84:]
#出力
print("[ICMP Header]")
print("type:%s, code:%s, checksum:%s" % (icmp_type, icmp_code, icmp_checksum))
if icmp_type == "00" or icmp_type == "08":
print("id:%s, sequenece:%s" % (icmp_id, icmp_seq))
print("[ICMP Data]")
print("data:%s" % icmp_data)
else:
print("")
def tcp_analyze(packet):
print("tcp解析は現在工事中！\nごめんなさい！")
def udp_analyze(packet):
print("udp解析は現在工事中！\nごめんなさい！")
if __name__ == '__main__':
argvs = sys.argv
argc = len(argvs)
if argc != 3:
print("Please confirm argument")
sys.exit()
interface = argvs[1]
cap_packet_type = argvs[2]
main(interface, cap_packet_type)