如何在比特币中使用套接字编程从比特币节点获取getaddr的响应？

Question

我想要从现有节点获取比特币节点的列表，目的是获取当前运行比特币的节点的所有ip地址。我已经使用套接字编程连接到现有节点，并希望获得该节点中的地址列表。所以我写了一条消息来获取这个节点的地址。但是，套接字不使用地址列表进行响应

    import socket;
    import time;
    import hashlib;
    import struct;
    import random;

    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM);
    HOST = "5.182.39.200";
    PORT = 8333;

    def create_version_message():
        version = struct.pack("i",70015);
        services = struct.pack("Q",0);
        timestamp = struct.pack("q",int(time.time()));
        addr_recv_services = struct.pack("Q",0);
        addr_recv_ip = struct.pack(">16s",bytes(HOST, 'utf-8'));
        addr_recv_port = struct.pack(">H",8333);
        addr_trans_services = struct.pack("Q",0);
        addr_trans_ip = struct.pack(">16s",bytes("127.0.0.1",'utf-8'));
        addr_trans_port = struct.pack(">H",8333);
        nonce = struct.pack("Q", random.getrandbits(64));
        user_agent_byes = struct.pack("B",0);
        start_height = struct.pack("i",596306);
        relay = struct.pack("?",False);
        payload = version + services + timestamp + addr_recv_services + addr_recv_ip + addr_recv_port + addr_trans_services + addr_trans_ip + addr_trans_port + nonce + user_agent_byes + start_height + relay;
        magic = bytes.fromhex("F9BEB4D9");
        command = b"version" + 5 * b"\00";
        length = struct.pack("I", len(payload));
        checksum = hashlib.sha256(hashlib.sha256(payload).digest()).digest()[:4];
        return magic + command + length + checksum + payload;

    def create_getaddr_message():
        magic = bytes.fromhex("F9BEB4D9");
        command = b"getaddr" + 5 * b"\00";
        payload = b"";
        length = struct.pack("I", len(payload));
        checksum = hashlib.sha256(hashlib.sha256(payload).digest()).digest()[:4];
        return magic + command + length + checksum + payload;

     sock.connect((HOST,PORT));
     sock.send(create_version_message());
     sock.recv(1024);
     time.sleep(5);
     sock.send(create_verack_message());
     time.sleep(5);
     sock.send(create_getaddr_message());
     sock.recv(1024);

Answer 1

你必须遵循比特币协议。

• 从远程发送版本message
• receive版本消息
• 从远程接收verac消息(您必须发出sock.recv两次)
• 发送verac消息

在此连接建立之后，您可以递归地发送getaddr消息和处理结果。