#include?<netdb.h>
#include?<stdio.h>
#include?<stdlib.h>
#include?<sys/socket.h>
#include?<netinet/in.h>
int?main(int?argc,char?*argv[]){
struct?sockaddr_in?addr;
struct?hostent?*he;
char?**alias;
if(argc<2){
printf("Usage:%s?name?|IP",argv[0]);
exit(1);
}
argv++;
for(;*argv!=NULL;argv++){
if(inet_aton(*argv,&addr.sin_addr)!=0){
he=gethostbyaddr((char?*)&addr,sizeof(addr),AF_INET);
printf("address?information?of?IP?%s:\n",*argv);
}else{
he=gethostbyname(*argv);
printf("address?information?of?host?%s:\n",*argv);
}
if(he==NULL){
printf("no?address?information?of?%s\n",*argv);
continue;
}
printf("Officaial?host?name:%s\n",he->h_name);
printf("name?aliases:");
for(alias=he->h_aliases;*alias!=NULL;alias++)
printf("%s\n",*alias);
printf("\nIP?addresses:");
for(alias=he->h_addr_list;*alias!=NULL;alias++)
printf("%s\n",inet_ntoa(*(struct?in_addr?*)(*alias)));
}
}
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