#include <stdio.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netdb.h>
int main(int argc, char *argv[])
{
struct hostent *myhost;
struct in_addr myinaddr; //IP 주소를 저장할 구조체
int i;
if(argc < 2)
{
printf("How to Use : %s host_name(domain name)\n", argv[0]);
exit(0);
}
/* hostent 구조체 구하기 */
myhost = gethostbyname(argv[1]);
if(myhost == 0)
{
printf("error at gethostbyname\n");
exit(0);
}
printf("official host name : \t\t%s\n", myhost->h_name); //호스트이름 출력
i = 0;
while(myhost->h_aliases[i] != NULL)
{
printf("aliases name : \t\t\t%s\n", myhost->h_aliases[i]); //호스트별명 출력
i++;
}
printf("host address type : \t\t%d\n", myhost->h_addrtype); //호스트주소타입 출력
printf("length of host address : \t%d\n", myhost->h_length); //호스트주소길이 출력
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)); //호스트주소를 dotted-decimal형태로 출력
i++;
}
return 0;
} |
