#include <sys/types.h> 
 
#include <unistd.h> 
#include <fcntl.h> 
#include <stdlib.h> 
#include <stdio.h> 
#include <sys/socket.h> 
#include <netinet/in.h> 
 
#include <arpa/inet.h> 
 
int main() 
{ 
    int sockfd; 
    int client_sockfd; 
    int client_len; 
    int state; 
    struct sockaddr_in clientaddr, serveraddr, myaddr,test; 
 
    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) 
    { 
        perror("socket error : "); 
        exit(0); 
    } 
    bzero(&serveraddr, sizeof(serveraddr)); 
    serveraddr.sin_family = AF_INET; 
    serveraddr.sin_addr.s_addr = htonl(INADDR_ANY); 
    serveraddr.sin_port = htons(4444); 
 
 
    state = bind(sockfd , (struct sockaddr *)&serveraddr, 
            sizeof(serveraddr)); 
    if (state == -1) 
    { 
        perror("bind error : "); 
        exit(0); 
    } 
 
 
    state = listen(sockfd, 5); 
    if (state == -1) 
    { 
        perror("listen error : "); 
        exit(0); 
    } 
    client_len = sizeof(clientaddr); 
    client_sockfd = accept(sockfd, (struct sockaddr *)&clientaddr, 
                            &client_len); 
 
 
    // 로컬 소켓의 정보를 얻어온다.  
    // 언어온 정보는 myaddr 에 채워진다.  
    getpeername(client_sockfd, (struct sockaddr *)&myaddr, &client_len); 
 
 
    // 얻어온 정보를 출력한다. 
    printf("Port    : %d\n", ntohs(myaddr.sin_port)); 
    printf("address : %s\n", inet_ntoa(myaddr.sin_addr)); 
 
    close(client_sockfd); 
    return 1; 
}