将端口号绑定到TCP套接字（outgoin）以发送数据包 [英] binding a port number to a TCP socket (outgoin) to send packets

问题描述

我知道将端口号绑定到 TCP套接字并不容易，您可以使用发送数据（因为系统通常将随机端口绑定到套接字）。

但我阅读了一篇文章，通过使用一些低级网络方法，您可以将端口号绑定到TCP套接字，发送数据？

有没有人知道如何做？

$ b code> s = socket（AF_INET，SOCK_STREAM，0）;
/ * ... * /

memset（& client_addr，0，sizeof（client_addr））;
client_addr.sin_family = AF_INET;
client_addr.sin_port = htons（22222）;

if（bind（s，（struct sockaddr *）& client_addr，sizeof（client_addr））< 0）{
perror（bind）;
exit（1）;
}

connect（s，（struct sockaddr *）& server_addr，sizeof（server_addr））;

I know that it is not easy to bind a port number to TCP socket that you would use to send data (because systems usually bind a random port to sockets).

But I read on one article that by using some low level networking methods you can bind a port number to a TCP socket then use it to send data ?

Does anyone has an idea about how that could be done ?

I am using c programming language

解决方案

Bind it before connecting.

s = socket(AF_INET, SOCK_STREAM, 0);
/* ... */

memset(&client_addr, 0, sizeof(client_addr));
client_addr.sin_family = AF_INET;
client_addr.sin_port = htons(22222);

if (bind(s, (struct sockaddr *) &client_addr, sizeof(client_addr)) < 0) {
    perror("bind");
    exit(1);
}

connect(s, (struct sockaddr *) &server_addr, sizeof(server_addr));

这篇关于将端口号绑定到TCP套接字（outgoin）以发送数据包的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！