/*  This is a program written by Mike Dilger, and prettied up a bit
    by Sam Lantinga:


In case you ever have an internet address and want to know the
machine name, or the other way around, use hostinfo:

*/

#include <errno.h>
#include <signal.h>
#include <stdio.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <ctype.h>

struct hostent      *server_info;   /* server name/address info */

int herror();

void main(argc, argv)
int argc;
char *argv[];
{
    	struct in_addr addr;
    	int scan;

    	if ( argc < 2 ) 
	{ 
		printf("Usage: %s [address|hostname]\n", argv[0]); 
                exit(1); 
	}

	printf("[ %s ]\n", argv[1]);
	fflush(stdout);

    	if ( isdigit(argv[1][0]) )  /* get by address */
    	{
      		addr.s_addr=inet_addr(argv[1]);
      		if ( (server_info=gethostbyaddr(&(addr.s_addr), sizeof(int),
							AF_INET)) == NULL )
        	{ 
			fprintf(stderr, "host name error: ");
			herror(argv[1]);  
			exit(1);
		}
    	}
    	else
    	{
      		if ( (server_info=gethostbyname(argv[1])) == NULL )
        	{ 
			fprintf(stderr, "host name error: ");
			herror(argv[1]);  
			exit(1); 
		}
    	}
 
    	printf("\nHostname:   %s\n", server_info->h_name);

    	if ( server_info->h_aliases != NULL )
    	{
      		printf("Aliases:  "); 
		scan=0;

      		while( server_info->h_aliases[scan] != NULL )
			printf("%s\n          ", server_info->h_aliases[scan++]);
      		printf("\n");
    	}

    	if (server_info->h_addr_list!=NULL)
    	{
      		printf("Addresses:  "); 
		scan=0;
      		while( server_info->h_addr_list[scan] != NULL )
      		{ 
			bcopy(server_info->h_addr_list[scan++], 
							&(addr.s_addr), 4);
        		printf("%s\n          ", inet_ntoa(addr));
		}
      		printf("\n");
    	}
}


extern int h_errno;

int herror(str)
char *str;
{

  	printf("%s: ",str);
  	switch(h_errno)
  	{
    		case 0: 	     printf("No error.\n"); 
				     break;
    		case HOST_NOT_FOUND: printf("Host not found.\n"); 
				     break;
    		case TRY_AGAIN:      printf("Try again.\n"); 
				     break;
    		case NO_RECOVERY:    printf("No recovery.\n"); 
				     break;
    		case NO_DATA: 	     printf("No data or no addresss.\n"); 
			      	     break;
    		default: 	     printf("Unknown error.\n");
  	}
}

/*
--------------------------------------------------------------------
   _/     _/  _/_/_/  _/    _/ _/_/_/_/		Jesus Saves
  _/_/ _/_/    _/    _/_/_/   _/_/	    ... but Hernando gets
 _/  _/ _/    _/    _/ _/    _/		   the rebound... he shoots,
_/     _/  _/_/_/  _/   _/  _/_/_/_/		he scores!!!
Michael Dilger		                   
dilger@toadflax.cs.ucdavis.edu                 
--------------------------------------------------------------------
*/