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linux下socket编程之时间服务器

第七根弦 2014 年 8 月 6 日 未分类 发表评论 (0)

为网络上的用户提供时间服务，即为网络用户返回服务器的当前时间；
记录发出请求的网络用户的IP地址（保存到文件中）；
编写时间服务客户端timeclient，该客户端能够向服务器发送时间服务请求，并把获得的时间返回给用户。

开发环境：fedora13，vim，gcc

timeserver.c文件

C++
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#include<stdio.h>
#include<unistd.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<time.h>
#include<netdb.h>
#include<stdlib.h>
#include<string.h>
#define PORT 1234
#define BACKLOG 5
 
int main()
{
int listenfd, connectfd;
struct sockaddr_in server;
struct sockaddr_in client;
socklen_t addrlen;
time_t t;
t=time(NULL);
FILE *fd=fopen("/root/saveIP","a");
if((listenfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
perror("socket() error.");
return 0;
}
 
int opt = SO_REUSEADDR;
setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
 
bzero(&server, sizeof(server));
server.sin_family = AF_INET;
server.sin_port = htons(PORT);
server.sin_addr.s_addr = htonl(INADDR_ANY);
if(bind(listenfd, (struct sockaddr *)&server, sizeof(server)) == -1)
{
perror("bind() error.");
        return 0;
 
}
if(listen(listenfd, BACKLOG) == -1)
{
perror("listen() error.");
return 0;
}
 
addrlen = sizeof(client);
if((connectfd = accept(listenfd, (struct sockaddr *)&client, &addrlen )) == -1)
   {
     perror("accept() error.");
return 0;
   }
printf("Timeclient's IP is %s.  ",inet_ntoa(client.sin_addr));
printf("Time is %s\n",ctime(&t));
send(connectfd,(time_t *)&t,sizeof(time_t),0);
fprintf(fd,"%s  %s\n",inet_ntoa(client.sin_addr),ctime(&t));
fclose(fd);
return 1;
}

timeclient.c文件

C++
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#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<strings.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<netdb.h>
 
#define PORT 1234   /*listen port*/
 
int main ( int argc, char *argv[])
{
int sockfd, num;
struct hostent *he;
struct sockaddr_in server;
 
time_t t;
if(argc!=2)
{
   printf("usage %s<ip address>\n",argv[0]);
return 0;
}
/*get ip address*/
if((he = gethostbyname(argv[1])) == NULL)
{
   printf("gethostbyname error\n");
                return 0;
 
}
if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
   printf("socket() error \n");
return 0;
}
   bzero(&server, sizeof(server));
server.sin_family = AF_INET;
server.sin_port = htons(PORT);
server.sin_addr = *((struct in_addr *)he->h_addr);
 
   if(connect(sockfd, (struct sockaddr *)&server, sizeof(server)) == -1)
{
   printf("connetc() error\n");
return 0;
}
recv(sockfd,(void *)&t,sizeof(time_t),0);
printf("Time is %s\n",ctime(&t));
}

运行结果：
0_1331271429L1XX

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