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99 lines
3.4 KiB
99 lines
3.4 KiB
1 year ago
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import asyncio
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import netifaces
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import socket
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import struct
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from common.utils.timezone import local_now_display
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from settings.utils import generate_ips, generate_ports
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async def once_tcpdump(
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interface, src_ips, src_ports, dest_ips, dest_ports, display, stop_event
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):
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loop = asyncio.get_event_loop()
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s = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, socket.ntohs(0x0003))
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s.bind((interface, 0))
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s.setblocking(False)
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while not stop_event.is_set():
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try:
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packet = await loop.sock_recv(s, 65535)
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except BlockingIOError:
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await asyncio.sleep(0.1)
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# 解析IP数据包
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ip_header = packet[14:34]
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ip_hdr = struct.unpack('!BBHHHBBH4s4s', ip_header)
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# 判断是否为TCP数据包
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protocol = ip_hdr[6]
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if protocol != 6:
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continue
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# 解析TCP数据包
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tcp_header = packet[34:54]
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tcp_hdr = struct.unpack('!HHLLBBHHH', tcp_header)
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# 获取源地址、源端口号、目标地址、目标端口等信息
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src_ip, dest_ip = map(lambda x: socket.inet_ntoa(x), ip_hdr[8:10])
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src_port, dest_port = tcp_hdr[0], tcp_hdr[1]
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# 获取数据包类型和长度
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packet_type = socket.htons(ip_hdr[6])
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packet_len = len(packet)
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# 获取TCP标志位、序号、确认号、部分数据等信息
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seq, ack, flags = tcp_hdr[2], tcp_hdr[3], tcp_hdr[5]
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data = packet[54:]
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# 如果过滤的参数[源地址、源端口等]为空，则不过滤
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# 各个过滤参数之间为 `且` 的关系
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green_light = True
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if src_ips and src_ip not in src_ips:
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green_light = False
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if src_ports and src_port not in src_ports:
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green_light = False
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if dest_ips and dest_ip not in dest_ips:
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green_light = False
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if dest_ports and dest_port not in dest_ports:
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green_light = False
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if not green_light:
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continue
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results = [
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f'[{interface}][{local_now_display()}] {src_ip}:{src_port} -> '
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f'{dest_ip}:{dest_port} ({packet_type}, {packet_len} bytes)',
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f'\tFlags: {flags} Seq: {seq}, Ack: {ack}', f'\tData: {data}'
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]
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for r in results:
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await display(r)
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def list_show(items, default='all'):
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return ','.join(map(str, items)) or default
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async def verbose_tcpdump(interfaces, src_ips, src_ports, dest_ips, dest_ports, display=None):
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if not display:
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return
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stop_event = asyncio.Event()
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valid_interface = netifaces.interfaces()
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if interfaces:
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valid_interface = set(netifaces.interfaces()) & set(interfaces)
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src_ips = generate_ips(src_ips)
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src_ports = generate_ports(src_ports)
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dest_ips = generate_ips(dest_ips)
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dest_ports = generate_ports(dest_ports)
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summary = [
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f"[Summary] Tcpdump filter info: ",
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f"Interface: [{list_show(valid_interface)}]",
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f"Source address: [{list_show(src_ips)}]",
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f"source port: [{list_show(src_ports)}]",
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f"Destination address: [{list_show(dest_ips)}]",
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f"Destination port: [{list_show(dest_ports)}]",
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]
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for s in summary:
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await display(s)
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params = [src_ips, src_ports, dest_ips, dest_ports, display, stop_event]
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tasks = [
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asyncio.create_task(once_tcpdump(i, *params)) for i in valid_interface
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]
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await asyncio.gather(*tasks)
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stop_event.set()
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