Python SSH 服务器 (socket + paramiko) "Address already in use"

Question

所以我决定阅读更多关于Python网络的内容，在我正在阅读的书中，有一段代码使用paramiko(第三方SSH模块(和套接字创建SSH服务器。

我遇到的问题是，每当我输入服务器地址时，它都会显示"地址已在使用中"。此外，我已经在使用sock.setsockopt(sock.SOL_SOCKET, sock.SO_REUSEADDR, 1)，所以地址可以重用，但问题仍然存在。

这是完整的代码：

import socket
import paramiko
import threading
import sys
import traceback
# using the key from the Paramiko demo files
host_key = paramiko.RSAKey(filename='test_rsa.key')
class Server (paramiko.ServerInterface):
    def __init__(self):
        self.event = threading.Event()
    def check_channel_request(self, kind, chanid):
        if kind=='session':
            return paramiko.OPEN_SUCCEEDED
        return paramiko.OPEN_FAILED_ADMINISTRATIVELY_PROHIBITED
    def check_auth_password(self,user, password):
        if (usernae == 'matheus') and (password ==  'password'):
            return paramiko.AUTH_SUCCESSFUL
        return paramiko.AUTH_FAILED
server = sys.argv[1]
ssh_port = int(sys.argv[2])
try:
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    sock.bind((server, ssh_port))
    sock.listen(100) # Wow so many connections
    print ("[+] Listening for connection ...")
    client, addr = sock.accept()
except Exception, e:
    print("[-] Listen failed: " + str(e))
    traceback.print_stack()
    sys.exit(1)
print("[+] Got a connection!") # runs as except exits

try:
    bhSession = paramiko.Transport(client)
    bhSession.add_server_key(host_key)
    server = Server()

    try:
        bhSession.start_server(server=server)
    except paramiko.SSHException, x:
        print("[-] SSH negotiation failed.")
    chan = bhSession.accept(20)
    print("[+] Authenticated!")
    print(chan.recv(1024))
    chan.send("Welcome to bh_ssh")
    while True:
        try:
            command = raw_input("Enter command: ").strip('n')
            if command != 'exit':
                chan.send(command)
                print(chan.recv(1024)+'n')
            else:
                chan.send('exit')
                print("exiting") 
                bhSession.close()
                raise Exception("exit")
        except KeyboardInterrupt:
            bhSession.close()
except Exception, e:
    print("[-] Caught exception: " + str(e))
    try:
        bhSession.close()
    except:
        pass
    sys.exit(1)

我试过的地址是：

192.168.1.107 (current device address)
0.0.0.0
0.0.0.1
127.0.0.1 (localhost)

港口总是22。

和平！

Answer 1

在绑定套接字之前，请尝试使用SO_REUSEADDR套接字选项。

sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

Answer 2

SO_REUSEPORT是大多数人所期望的SO_REUSEADDR。

基本上，SO_REUSEPORT允许您将任意数量的套接字绑定到完全相同的源地址和端口，只要所有先前绑定的套接字在绑定之前都设置了SO_REUSEPORT即可。