#include <arpa/inet.h>

#include <errno.h>

#include <netinet/in.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/io.h>

#include <sys/stat.h>

#include <sys/socket.h>

#include <sys/time.h>

#include <sys/times.h>

#include <sys/types.h>

#include <sys/wait.h>

#include <time.h>

#include <unistd.h>

#define szSTR 256

#define SERVERPORT 21429 /*please modify the port with your id*/

int do_listen(const int port, const int bTcp)

{

 int s = , r = , o = ;

 struct sockaddr_in h;

 memset(&h, , sizeof(h));

 h.sin_family = AF_INET; h.sin_port = htons(port);

 h.sin_addr.s_addr = INADDR_ANY;

 s = socket(AF_INET, bTcp?SOCK_STREAM:SOCK_DGRAM, );

 if (s < ) { perror("socket(listen)"); return ;}

 r = setsockopt(s, SOL_SOCKET,SO_REUSEADDR, (char *)&o, sizeof(int));

 if (r == -) { perror("setsockopt(listen)"); return ;}

 r = bind(s, (struct sockaddr *)&h, sizeof(h));

 if (r == -) { perror("bind(listen)"); return ;}

 if (bTcp) {

  r = listen(s, SOMAXCONN);

  if (r == -) { perror("listen()"); return ;}

 }/*end if*/

 /*signal(SIGPIPE, SIG_IGN);*/

 return s;

}/*end do_listen*/

void response(int sck, struct sockaddr_in * host)

{

 FILE * f = ; char cmd[szSTR]; time_t now;

 struct tm * t = ;

 f = fdopen(sck, "w+");

 while(!feof(f)) {

  memset(cmd, , szSTR);

  fgets(cmd, szSTR -, f);

  time(&now);

  t = localtime(&now);

  if(strstr(cmd, "DATE")) {

   fprintf(stderr, "Query Type: Date\n");

   fprintf(f, "Date: %d %d, %d\n", t->tm_mon + , t->tm_mday, t->tm_year + );

   continue;

  }/*end if*/

  if(strstr(cmd, "TIME")) {

   fprintf(stderr, "Query Type: Time\n");

   fprintf(f, "Time: %02d::%02d::%02d\n", t->tm_hour, t->tm_min, t->tm_sec);

   continue;

  }/*end if*/

  if(strstr(cmd, "EXIT")) break;

  fprintf(f, "commands: DATE, TIME, EXIT.\n");

 }/*end while*/

 shutdown(sck, SHUT_RDWR);

 close(sck);

 fclose(f);

 return ;

}/*end response*/

int main(void)

{

 socklen_t sklen = ;int sck = , i = , listener = ;

 struct sockaddr_in client; pid_t proc = ;

 system("ifconfig");

 listener = do_listen(SERVERPORT, );

 if(listener < ) { perror("listen()"); return ; }

 for(i=;i<;i++) {

  memset(&client, , sizeof(client));

  sklen = sizeof(client);

  sck = accept(listener, (struct sockaddr *)&client, &sklen);

  if(sck < ) break;

  proc = fork();

  if (proc == -) { perror("fork()"); break ; }

  if(proc) continue;

  response(sck, &client);

  break;

 }/*next*/

 close(listener);

 return ;

}/*end main*/

#include <arpa/inet.h>

#include <errno.h>

#include <netinet/in.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/io.h>

#include <sys/stat.h>

#include <sys/socket.h>

#include <sys/time.h>

#include <sys/times.h>

#include <sys/types.h>

#include <sys/wait.h>

#include <time.h>

#include <unistd.h>

#define szSTR 256

#define SERVERPORT 21429 /*please modify the port with your id*/

int cnn(const char * ip, const int port)

{

 struct sockaddr_in h; memset(&h, , sizeof(h));

 h.sin_family = AF_INET; h.sin_port = htons(port);

 h.sin_addr.s_addr = inet_addr(ip);

 int s = socket(AF_INET, SOCK_STREAM, );

 if (s < ) { perror("socket(tcp)"); return ;}

 int r = connect(s, (struct sockaddr *)&h, sizeof(h));

 if (r == ) return s;

 perror("connect()");

 return ;

}//end cnn

int main(void)

{

 int sck = ; FILE * f = ; char ip[szSTR]="127.0.0.1";

 fprintf(stderr, "Please input the calendar server ip:");

 fgets(ip, szSTR - , stdin);

 sck = cnn(ip, SERVERPORT);

 if(sck < ) return ;

 f = fdopen(sck, "w+");

 fprintf(f, "DATE\r\n");

 fgets(ip, szSTR - , f);

 fprintf(stderr, "%s\n", ip);

 fprintf(f, "TIME\r\n");

 fgets(ip, szSTR - , f);

 fprintf(stderr, "%s\n", ip);

 fprintf(f, "EXIT\r\n");

 fclose(f);

 close(sck);

 return ;

}/*end main*/