type, code, checksum, packetID, sequence = struct.unpack("!bbHHh",header) if type == 0 and packetID == ID: # type should be 0 byte_in_double = struct.calcsize("d") timeSent = struct.unpack("!d", recPacket[28 : 28 + byte_in_double])[0] delay = timeReceived - startedSelec...
parser = argparse.ArgumentParser(description='Send and receive UDP''pretending packets are often dropped') parser.add_argument('role', choices=choices, help='which role to take') parser.add_argument('host', help='interface the server listen at;''host the client sends to') parser.add_argument...
通信协议 发送数据所用协议 ip, ip6, tcp, udp examples: 只捕获来源于网络中某一IP的主机流量: src host 192.168.10.1 只捕获80端口: port 80 只捕获ICMP流量: ICMP 保存数据 示例代码 from scapy.all import * def capture(packet): print("*"*30) print(f"source:{packet[IP].src}:{packet.sport}...
2.3.2 实现UDP服务器与客户端通信 2.3.2.1 数据报的发送与接收 在UDP服务器端,我们不需要调用listen()和accept(),而是直接recvfrom()和sendto(): server_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) server_socket.bind(('localhost', 9000)) while True: data, address = server_socket.r...
() 524 525 526 # 4、tcp与udp的区别 527 # (1)、 tcp是面向连接的,而udp是无连接, 528 # 在服务器端的反应就是,tcp需要做很多的设置工作,例如要进行监听listen,然后监听之后,进行接收客户端的连接, 529 # 也就是accept,当接收到连接之后,传递过来的是客户端的socket对象,然后利用这个socket对象进行发送...
udpSocket = socket(AF_INET, SOCK_DGRAM) destIp = input("请输入目的ip:") destPort = int(input("请输入目的port:")) sendData = input("请输入要发送的数据:") #udpSocket.sendto(sendData.encode("utf-8"), (destIp, destPort)) udpSocket.sendto(sendData.encode("gb2312"), (destIp, dest...
创建Socket后，需要绑定特定地址和端口。服务器Socket进入监听模式，等待客户端的连接请求。TCP与UDP通信：TCP：确保连接的建立与数据的可靠传输，适用于需要高可靠性的应用。UDP：无需预先建立连接，适用于对延迟要求低的应用，但不保证数据的可靠传输。Socket编程方法：Python的socket模块提供了bind, listen,...
import socket import os # host to listen HOST = '192.168.1.114' def sniffing(host, win, socket_prot): while 1: sniffer = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket_prot) sniffer.bind((host, 0)) # include the IP headers in the captured packets sniffer.setsockopt(socket.IPPRO...
u LISTEN 侦听状态,等待来自远方TCP端口的连接请求 u SYN-SENT 在发送连接请求后,等待对方确认 u SYN-RECEIVED 在收到和发送一个连接请求后,等待对方确认 u ESTABLISHED 代表传输连接建立,双方进入数据传送状态 u FIN-WAIT-1 主动关闭,主机已发送关闭连接请求,等待对方确认 ...
(ceiling function) passed deadlinenote : Sat/Sun count as one day; therefore H = 0.5*Hweekend2Problem #1 TCP SocketsServer-70 pointsWrite a console program that takes as a command line argument the port number on whichthe TCP Server will listen for connection requests. A separate thread ...