python中的UDP打洞

Question

我正在尝试使用 UDP 打洞建立点对点通信。我首先与服务器建立连接，然后尝试在 2 个客户端之间进行通信，但我无法在 2 个不同 NAT 后面的 2 台计算机之间进行通信，因为我不明白必须输入什么 IP 地址和端口建立通讯。 请告诉我必须对下面的代码进行哪些更改才能使两台计算机能够通信。

PS：外部IP似乎不起作用，我不应该使用任何其他工具，例如ngrok

Server.py

import socket
import struct
import sys

server_listening_port = 12345

sockfd = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sockfd.bind(("", server_listening_port))
print("Listening on the port " + str(server_listening_port))

client_requests = []

while True:
    data, addr = sockfd.recvfrom(32)
    client_requests.append(addr)
    print("Connection from: " + str(addr))

    if len(client_requests) == 2:
        break

client_a_ip = client_requests[0][0]
client_a_port = client_requests[0][1]
client_b_ip = client_requests[1][0]
client_b_port = client_requests[1][1]

message = ": "

sockfd.sendto(str(client_a_ip).encode("utf-8") + message.encode("utf-8") + str(client_a_port).encode("utf-8"), client_requests[1])
sockfd.sendto(str(client_b_ip).encode("utf-8") + message.encode("utf-8") + str(client_b_port).encode("utf-8"), client_requests[0])
sockfd.close()

上面是集合服务器

ClientA.py

import socket
import struct
import sys
import time
master = ("Server_IP", Port)

#Create dgram udp socket
try:
    sockfd = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    message = "Hello"
    sockfd.bind(('', 0))
    sockfd.sendto(message.encode("utf-8"), master)

except socket.error:
    print("Failed to create socket")
    sys.exit()

# #Receiving peer info from server
peer_data, addr = sockfd.recvfrom(1024)
print (peer_data)

print("trying to communicate with peer")
peer_ip = peer_data.decode("utf-8").split(":")[0]
peer_port = int(peer_data.decode("utf-8").split(":")[1])

peer = (peer_ip, peer_port)

while 1:
    message1 = input(str("You:>>"))
    message = message.encode("utf-8")
    sockfd.sendto(str(message).encode("utf-8"), peer)
    incoming_msg, sendaddr = sockfd.recvfrom(1024)
    incoming_msg = incoming_msg.decode("utf-8")
    print("ClientB:>>",incoming_msg)

上面的代码是客户端A

ClientB.py

import socket  #For sockets
import struct
import sys    #For exit
import time
master = ("Server_IP", port)
me = ("ClientB_IP", port)

#Create dgram udp socket
try:
    sockfd = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    message = "Hello"
    sockfd.bind(('', 0))
    sockfd.sendto(message.encode("utf-8"), master)

except socket.error:
    print("Failed to create socket")
    sys.exit()

# #Receiving peer info from server
peer_data, addr = sockfd.recvfrom(1024)
print (peer_data)

print("trying to communicate with peer")
peer_ip = peer_data.decode("utf-8").split(":")[0]
peer_port = int(peer_data.decode("utf-8").split(":")[1])
peer = (peer_ip, peer_port)

while 1:
    incoming_msg, sendaddr = sockfd.recvfrom(1024)
    incoming_msg = incoming_msg.decode("utf-8")
    print("ClientA:>>", incoming_msg)
    message = input(str("You :>>"))
    message = message.encode("utf-8")
    sockfd.sendto(str(message).encode("utf-8"), peer)

上面是客户端B

我只面临IP地址和端口的问题。所以，请帮助我在2个不同NAT后面的2台计算机之间建立通信

Answer 1

我目前遇到同样的问题，我想自己编程。经过一些研究，我发现了一篇非常好的论文，详细解释了这个过程。
如果我成功了，我会告诉你。
https://bford.info/pub/net/p2pnat/