修改服务器，以便它只会监听回送接口

Question

我正在尝试运行客户端服务器连接。这里是我的代码：

server.c

#include <sys/socket.h> 
#include <arpa/inet.h> 
#include <stdio.h> 
#include <time.h> 
#include <unistd.h> 
#include <string.h> 

#define MAX_BUFFER 128 
#define DAYTIME_SERVER_PORT 13 

/.../ INT主要（无效）{ INT serverFd，connectionFd; struct sockaddr_in servaddr; char timebuffer [MAX_BUFFER + 1]; time_t currenTime;

serverFd = socket(AF_INET, SOCK_STREAM, 0); 

    memset(&servaddr, 0 , sizeof(servaddr)); 
    servaddr.sin_family = AF_INET; 
    servaddr.sin_addr.s_addr = htonl(INADDR_ANY); 
    servaddr.sin_port = htons(DAYTIME_SERVER_PORT); 

    bind(serverFd, (struct sockaddr *) &servaddr, sizeof(servaddr)); 
    listen(serverFd, 5); 

    while(1) 
    { 
     connectionFd = accept(serverFd, (struct sockaddr *) NULL, NULL); 

     if(connectionFd >= 0) 
     { 
      currenTime = time(NULL); 
      snprintf(timebuffer, MAX_BUFFER, "%s\n", ctime(&currenTime)); 
      write(connectionFd, timebuffer, strlen(timebuffer)); 
      close(connectionFd); 
     } 
    } 
} 

client.c

#include <sys/socket.h> 
#include <arpa/inet.h> 
#include <stdio.h> 
#include <time.h> 
#include <unistd.h> 
#include <string.h> 

#define MAX_BUFFER 128 
#define DAYTIME_SERVER_PORT 13 


int main() 
{ 
    int connectionFd, in; 
    struct sockaddr_in servaddr; 
    char timebuffer[MAX_BUFFER+1]; 

    connectionFd = socket(AF_INET,SOCK_STREAM,0); 

    memset(&servaddr,0 ,sizeof(servaddr)); 
    servaddr.sin_family = AF_INET; 
    servaddr.sin_port = htons(DAYTIME_SERVER_PORT); 
    servaddr.sin_addr.s_addr = inet_addr("127.0.0.1"); 

    connect(connectionFd,(struct sockaddr_in *) &servaddr , sizeof(servaddr)); 

    while((in = read(connectionFd, timebuffer, MAX_BUFFER)) >0) 
    { 
     timebuffer[in] = 0; 
     printf("\n%s" , timebuffer); 
    } 
    /*...*/ 
    close(connectionFd); 

} 

如何修改服务器监听loopback接口（而不是其他接口）上？

Answer 1

变化

servaddr.sin_addr.s_addr = htonl(INADDR_ANY); 

只使用环回地址。即

servaddr.sin_addr.s_addr = htonl(2130706433L) 

（用于http://www.smartconversion.com/unit_conversion/IP_Address_Converter.aspx做数学）