Question

对于我们的任务，当我们运行我们的小机器人时，它会陷入无限循环，我们无法让它结束。它所做的就是不断寻找新的机器人，例如：

Waiting for connection...
Enter command: p2p echo
Finding another bot...
Found bot on port 1338
No bot was listening on port 1338
Found bot on port 1339
No bot was listening on port 1339
Found bot on port 1340
No bot was listening on port 1340
Found bot on port 1341
No bot was listening on port 1341
Found bot on port 1342

以下代码

import socket
import threading

from lib.comms import StealthConn
from lib.files import p2p_download_file

# Keep track of where our server is
# This is primarily so we don't try to talk to ourselves
server_port = 1337

def find_bot():
    print("Finding another bot...")
    port = 1337
    conn = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    while 1:
        if port == server_port:
            # Don't connect to yourself, silly bot!
            port += 1
        else:
            try:
                print("Found bot on port %d" % port)
                conn.connect(("localhost", port))
                sconn = StealthConn(conn, client=True)
                return sconn
            except socket.error:
                print("No bot was listening on port %d" % port)
                port += 1

def echo_server(sconn):
    while 1:
        data = sconn.recv()
        print("ECHOING>", data)
        sconn.send(data)
        if data == b'X' or data == b'exit' or data == b'quit':
            print("Closing connection...")
            sconn.close()
            return

def accept_connection(conn):
    try:
        sconn = StealthConn(conn, server=True)
        # The sender is either going to chat to us or send a file
        cmd = sconn.recv()
        if cmd == b'ECHO':
            echo_server(sconn)
        elif cmd == b'FILE':
            p2p_download_file(sconn)
    except socket.error:
        print("Connection closed unexpectedly")

def bot_server():
    global server_port
    # Every bot is both client & server, so needs to listen for
    # connections. This is to allow for peer to peer traffic.
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    # Real worms use shifting ports but for simplicity, we won't.
    # We'll also assume you may run another bot on your computer
    # so if something else is using 1337, we'll keep going up.
    while True:
        try:
            s.bind(("localhost", server_port))
            print("Listening on port %d" % server_port)
            break
        except socket.error:
            # Someone is already using that port -- let's go up one
            print("Port %d not available" % server_port)
            server_port += 1
    s.listen(5)

    while 1:
        print("Waiting for connection...")
        conn, address = s.accept()
        print("Accepted a connection from %s..." % (address,))
        # Start a new thread per connection
        # We don't need to specify it's a daemon thread as daemon status is inherited
        threading.Thread(target=accept_connection, args=(conn,)).start()

环顾四周，似乎找不到类似的东西。

Answer 1

您在try-except

中获得了例外

print("Found bot on port %d" % port)

你打印出＆＃34; Found bot＆＃34;尝试连接到机器人之前的部分。 return sconn和While之间存在例外情况。你没有点击那个return语句，因此无限循环。 try: conn.connect(("localhost", port)) sconn = StealthConn(conn, client=True) if sconn: # Check for a return value that makes sense whatever # StealthConn is print("Found bot on port %d" % port) return sconn except socket.error: print("No bot was listening on port %d" % port) port += 1永远是真的。

假设你找到一个机器人，sconn会返回一些值，你只需要重新排列。

{{1}}

Python回声输出不断搜索但永远不会结束

1 个答案: