从听连接提取IP和在C接受套接字编程在Linux中 [英] Extract IP from connection that listen and accept in socket programming in Linux in c

问题描述

在以下code，我想接受传入连接后提取连接的客户端的IP地址。我应该怎么做后的接受（）来实现呢？

  INT的sockfd，newsockfd，PORTNO，clilen;
PORTNO = 8090;
clilen = 0;
的pthread_t serverIn;
结构SOCKADDR_IN serv_addr，cli_addr;
的sockfd =插座（AF_INET，SOCK_STREAM，0）;
如果（的sockfd℃，）
{
    PERROR（错误打开插座）;
}
bzero（（字符*）及serv_addr，sizeof的（serv_addr））;
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons（PORTNO）;
serv_addr.sin_addr.s_addr = INADDR_ANY;
如果（绑定（的sockfd，（结构sockaddr *）及serv_addr，sizeof的（serv_addr））小于0）
{
    PERROR（关于绑定错误）;
}听（的sockfd，5）;
clilen = sizeof的（cli_addr）;
newsockfd =接受（的sockfd，（结构sockaddr *）及cli_addr，＆安培; clilen）;
 

解决方案

getpeername（）

请参阅如何在使用它的不可缺少的Beej的指南网络的有益说明编程。

In the following code I would like to extract the IP address of the connected client after accepting an incoming connection. What should I do after the accept() to achieve it?

int sockfd, newsockfd, portno, clilen;
portno = 8090;
clilen = 0;
pthread_t serverIn;
struct sockaddr_in serv_addr, cli_addr;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
{
    perror("ERROR opening socket");
}
bzero((char *) & serv_addr, sizeof (serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(portno);
serv_addr.sin_addr.s_addr = INADDR_ANY;
if (bind(sockfd, (struct sockaddr *) & serv_addr, sizeof (serv_addr)) < 0)
{
    perror("ERROR on binding");
}

listen(sockfd, 5);
clilen = sizeof (cli_addr);
newsockfd = accept(sockfd, (struct sockaddr *) & cli_addr, &clilen);

解决方案

getpeername()

See the helpful description of how to use it over at the indispensable Beej's Guide to Network Programming.

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