UNIX网络编程练习-获取客户端IP和端口

来源：互联网发布：天津城建大学学校域名编辑：程序博客网时间：2024/05/22 03:12

// 服务端程序// DATE: 2015.11.30// AUTH: robertkun#include <netinet/in.h>#include <sys/socket.h>#include <sys/types.h>#include <arpa/inet.h>#include <stdlib.h>#include <stdio.h>#include <iostream>#include <string.h>#include <unistd.h>#include <errno.h>using namespace std;typedef struct sockaddr SA;int main(){char buff[256] = {0};// 创建TCP套接字int _fd = socket(AF_INET, SOCK_STREAM, 0);// 绑定端口到套接字struct sockaddr_in addr;bzero(&addr, sizeof(addr));addr.sin_family = AF_INET;addr.sin_addr.s_addr = htonl(INADDR_ANY);addr.sin_port = htons(6543);if(bind(_fd, (SA *)&addr, sizeof(addr)) != 0) {cerr<<"bind error!"<<errno<<endl;return -1;}// 打开监听if(listen(_fd, 256) != 0) {cerr<<"listen error!"<<endl;return -1;}// 等待连接while(1){struct sockaddr_in c_addr;socklen_t c_len = sizeof(c_addr); // 这里必须初始化,才可以使用int _connfd = accept(_fd, (SA *)&c_addr, &c_len);if(_connfd) {// 获取客户端信息,也可以使用getpeername()函数//getpeername(_connfd, (SA *)&c_addr, &c_len);cout<<"accept ok! "<<"client = "<<inet_ntoa(c_addr.sin_addr)<<":"<<ntohs(c_addr.sin_port)<<endl;}time_t ticks = time(NULL);snprintf(buff, sizeof(buff), "%.24s\r\n", ctime(&ticks));write(_connfd, buff, strlen(buff));// 终止连接close(_connfd);}return 0;}

输出:

man accept:

The addrlen argument is a value-result argument:
the caller must initialize it to contain the size (in bytes) of the structure pointed to by addr;
on return it will contain the actual size of the peer address.

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