Daytime service UDP 서버 <윈도우기반>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <time.h>

#include <winsock2.h>

 

#pragma comment(lib,"ws2_32.lib")

 

#define BUFSIZE 30

 

void ErrorHandling(char *message);

 

int main(int argc, char **argv)

      {

           WSADATA wsaData;

           SOCKET hServSock;

           char message[BUFSIZE];

           int strLen,num=0;

           time_t timer;

                    struct tm *t;

 

           SOCKADDR_IN    servAddr;

           SOCKADDR_IN    clntAddr;

 

           int clntAddrSize;

 

           if(WSAStartup(MAKEWORD(2,2),&wsaData)!=0)

                    ErrorHandling("WSAStartup() error!");

                                   hServSock = socket(PF_INET,SOCK_DGRAM,0);

 

           if(hServSock == INVALID_SOCKET)

                      ErrorHandling("socket() error!");

 

           memset(&servAddr,0,sizeof(servAddr));

           servAddr.sin_family = AF_INET;

           servAddr.sin_addr.s_addr = htonl(INADDR_ANY);

           servAddr.sin_port = htons(4000);

 

           if(bind(hServSock,(SOCKADDR*)&servAddr,sizeof(servAddr))==SOCKET_ERROR)

                     ErrorHandling("bind() error");

 

           while(1)

                              {

                     timer = time(NULL);

                                  t=localtime(&timer);       

                   clntAddrSize = sizeof(clntAddr);                   

                   strLen = recvfrom(hServSock,message,BUFSIZE,0,(SOCKADDR*)&clntAddr,&clntAddrSize);

                   sendto(hServSock,message,strLen,0,(SOCKADDR*)&clntAddr,sizeof(clntAddr));

                   sendto(hServSock,(char *)t,sizeof(struct tm),0,(SOCKADDR*)&clntAddr,sizeof(clntAddr));

 

                   printf("클라이언트 IP주소 : %s\n",inet_ntoa(clntAddr.sin_addr));

                   printf("클라이언트 접속시간 : %2d:%02d:%02d\n\n",t->tm_hour,t->tm_min,t->tm_sec);

 

                 }

 

           closesocket(hServSock);

           WSACleanup();

           return 0;

 

}

 

 

 

void ErrorHandling(char *message)

{
     fputs(message,stderr);

     fputc('\n',stderr);

     exit(1);

}