import socket

server = socket.socket(socket.AF_INET,socket.SOCK_STREAM)#ipv4,tcp
# Socket Families(地址簇)
# socket.AF_UNIX unix本机进程间通信
# socket.AF_INET　IPV4　
# socket.AF_INET6  IPV6

# Socket Types
# socket.SOCK_STREAM  #for tcp
# socket.SOCK_DGRAM   #for udp
# socket.SOCK_RAW     #原始套接字，普通的套接字无法处理ICMP、IGMP等网络报文，而SOCK_RAW可以；
# 其次，SOCK_RAW也可以处理特殊的IPv4报文；此外，利用原始套接字，可以通过IP_HDRINCL套接字选项由用户构造IP头。
# socket.SOCK_RDM  #是一种可靠的UDP形式，即保证交付数据报但不保证顺序。SOCK_RAM用来提供对原始协议的低级访问，
# 在需要执行某些特殊操作时使用，如发送ICMP报文。SOCK_RAM通常仅限于高级用户或管理员运行的程序使用。

server.bind(("0.0.0.0",8000))       #绑定ip,端口
server.listen(5)        #监听5个
print("-----------------start to listen.....")
conn,client_addr = server.accept()  #等待 conn 链接的标记位； client_addr的链接地址
#conn就是客户端链接过来而在服务器端为其生成的一个连接实例
# print(conn,client_addr)
while True:
    data = conn.recv(1024)
    print("recv from cli:",data.decode())
    conn.send("got your mes".encode())
server.close()

import socket

client = socket.socket()    #声明socket类型，同时生成socket链接对象
client.connect(("localhost",8000))

while True:
    msg = input(">>:").strip()
    if len(msg) == 0:continue       #如果不写会卡住
    client.send(msg.encode("utf-8"))       #转成utf-8
    print("send",msg)
    # data = http://www.mamicode.com/client.recv(1024)        #1024byte
    # print("receive from server:",data.decode())

client.close()

import socket,subprocess

server = socket.socket(socket.AF_INET,socket.SOCK_STREAM)#ipv4,tcp
server.bind(("0.0.0.0",8000))       #绑定ip,端口
server.listen(5)        #监听5个
print("-----------------start to listen.....")
while True:
    conn,client_addr = server.accept()  #等待 conn 链接的标记位； client_addr的链接地址
    #conn就是客户端链接过来而在服务器端为其生成的一个连接实例
    # print(conn,client_addr)
    while True:
        data = conn.recv(1024)      #接过来的命令
        res_obj = subprocess.Popen(data,shell=True,stdout=subprocess.PIPE,stderr=subprocess.PIPE)
        res = res_obj.stdout.read()
        conn.send(str(len(res)).encode())
        conn.send(res)
server.close()

import socket

client = socket.socket()    #声明socket类型，同时生成socket链接对象
client.connect(("localhost",8000))

while True:
    msg = input(">>:").strip()
    if len(msg) == 0:continue       #如果不写会卡住
    client.send(msg.encode())       #转成utf-8
    print("send",msg)
    data = client.recv(1024)        #1024byte
    print("receive from server:",data.decode())
    total_size = int(data.decode())

    received_size = 0
    res = b‘‘
    while received_size < total_size:
        d = client.recv(1024)
        res += d
        received_size += len(d)
    print("--------rece done--------")
    print(res.decode())

client.close()