/*
linux下用这个结构体来存放主机信息，
       The hostent structure is defined in <netdb.h> as follows:

              struct hostent {
                      char    *h_name;        /* official name of host */
                      char    **h_aliases;    /* alias list */
                      int     h_addrtype;     /* host address type */
                      int     h_length;       /* length of address */
                      char    **h_addr_list;  /* list of addresses */
              }
              #define h_addr  h_addr_list[0]  /* for backward compatibility */

*/

#include <stdio.h>
#include <netdb.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>

int main(void)
{
    struct hostent * hostmine;
    struct hostent * hostother;
    int i=0;
    char buf[16];
    hostmine= gethostent();
    hostother=gethostbyname("www.hebtu.edu.cn");
    if(hostmine == NULL){printf("gethostent error\n");exit(-1);}
    if(hostother == NULL){printf("gethostbyname  error\n");exit(-1);}
    printf("my information*****************************************\n");
    printf("h_name\t:%s\n",hostmine->h_name);
    while(hostmine->h_aliases[i] !=NULL)
        {printf("h_aliases[%d]\t:%s\n",i,hostmine->h_aliases[i]);i++;}
    printf("the address types is %d\n",hostmine->h_addrtype);
    printf("the ip length is %d\n",hostmine->h_length);
    i=0;
    while(hostmine->h_addr_list[i]!=NULL){
        inet_ntop(AF_INET,hostmine->h_addr_list[i],buf,sizeof(buf));
        printf("h_addr_list[%d]:\t%s\n",i,buf);i++;
    }
    
    printf("hebtu's information************************************\n");
    printf("h_name\t:%s\n",hostother->h_name);
    while(hostother->h_aliases[i] !=NULL)
        {printf("h_aliases[%d]\t:%s\n",i,hostother->h_aliases[i]);i++;}
    printf("the address types is %d\n",hostother->h_addrtype);
    printf("the ip length is %d\n",hostother->h_length);
    i=0;
    while(hostother->h_addr_list[i]!=NULL){
        inet_ntop(AF_INET,hostother->h_addr_list[i],buf,sizeof(buf));
        printf("h_addr_list[%d]:\t%s\n",i,buf);i++;
    }
   
/*注意主机的地址是以二进制的形式存放在h_addr_list下，要用inet_ntop准换过来
*/   
   
}