根据主机名获取主机Ip

根据主机名获取主机Ip：

 

源程序analyname.c：

 

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

int main(int argc,char** argv)
{
    struct hostent *server_addr = NULL;
    
    char *pstr = NULL;
    int i = 0;

    if(argc != 2)
    {
        printf("Userage :analyname host\n");
        printf("Example :analyname \n");
        exit(0);
    }
    
    server_addr = gethostbyname(argv[1]);
    if(NULL == server_addr)
    {
        printf("Can't Find The Server:%s\n",argv[1]);
        exit(0);
    }
    
    //name

    printf("Name:%s\n",server_addr->h_name);

    //alist name

    pstr = server_addr->h_aliases[i];
    for(i=0; pstr=server_addr->h_aliases[i],pstr;i++)
        printf("Aliase%-2d:%s\n",i,pstr);

    // ip address

    for(i=0; pstr=server_addr->h_addr_list[i]; i++)
        printf("Address%-2d:%s\n",i,inet_ntoa((*(struct in_addr*)pstr)));
    return 0;
}


编译：

gcc -g -o analyname analyname.c

执行：

./analyname