호스트 별명 출력하기

#include <winsock2.h>
#include <stdlib.h>
#include <stdio.h>

// 소켓 함수 오류 출력
void err_display(char *msg)
{
 LPVOID lpMsgBuf;
 FormatMessage(
  FORMAT_MESSAGE_ALLOCATE_BUFFER|
  FORMAT_MESSAGE_FROM_SYSTEM,
  NULL, WSAGetLastError(),
  MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
  (LPTSTR)&lpMsgBuf, 0, NULL);
 printf("[%s] %s", msg, (LPCTSTR)lpMsgBuf);
 LocalFree(lpMsgBuf);
}

int main(int argc, char* argv[])
{
 
 
 HOSTENT *myhost;
 IN_ADDR  myinaddr;
 
 int i;
 
 WSADATA wsa;
 if(WSAStartup(MAKEWORD(2, 2), &wsa) != 0)
  return -1;
 
 myhost = gethostbyname("www.yahoo.co.kr");

 if (myhost == NULL)
 {
  err_display("gethostbyname()");
  exit(0);
 }

 printf("official host name : \t\t%s\n", myhost->h_name);

 i = 0;
 while(myhost->h_aliases[i] != NULL)
 {
 
  printf( "aliases name : \t\t\t%s\n", myhost->h_aliases[i] );
  i++;
 }

 printf("host address type : \t\t%d\n", myhost->h_addrtype);
 
 printf("length of host address : \t%d\n", myhost->h_length);
 
 i = 0;
 while(myhost->h_addr_list[i] != NULL)
 {
  myinaddr.s_addr = *( (u_long *)(myhost->h_addr_list[i]) ) ;
  printf("IP address : \t\t\t%s\n", inet_ntoa(myinaddr)) ;
  i++;
 }

 

 WSACleanup();
 return 0;
}