dns

[Constantinos A. Kotsokalis]

On 9 Mar 1999 12:37:34 +0200, Vasilis Vasaitis wrote:
>  I gethostbyname dexetai mia xara _kai_ IP addresses (os strings vevaia).
>Me tin sigkekrimeni allagi, kliseis tou programmatos tou tipou `hostname
>127.0.0.1' eksakolouthoun na douleuoun to idio kala me prin.

Dokimh sxetika me auto:

#include <stdio.h>
#include <netdb.h>
#include <netinet/in.h>

main(int argc, char *argv[]){
	struct hostent *hp;
	struct in_addr ina;

	hp = gethostbyname(argv[1]);
	if (!hp){
		printf("NULL\n");
		exit(0);
	}
	else {
        printf("Hostname: %s\n", hp->h_name);
		while (*(hp->h_aliases)){
			printf("Alias: %s\n", *(hp->h_aliases));
			(hp->h_aliases)++;
		}
		printf("Address type: %d\n", hp->h_addrtype);
		printf("Address length: %d\n", hp->h_length);
		while (*(hp->h_addr_list)){
			bcopy(*(hp->h_addr_list), (char *)&ina, hp->h_length);
			printf("IP address: %s\n", inet_ntoa(ina));
			(hp->h_addr_list)++;
		}
	}
}

Tre3imo tou parapanw:

root at geek ~/tmp # ./a.out 147.102.223.210
Hostname: 147.102.223.210
Address type: 2
Address length: 4
IP address: 147.102.223.210

Opws blepeis, den brhke onoma... Opote auto pou epistrefei h gethostyname()
me argument IP address einai toulaxiston elleipes. Par'ola auta, gia to
poly sygkekrimeno pou h8ele o filos mas (hostname->IP) nai h gethostbyname()
apo monh ths tha doulebe mia xara.

    Costas

-- 
Constantinos A. Kotsokalis || C.Kotsokalis at ece.ntua.gr
National Technical University of Athens - GREECE
Electrical and Computer Engineering Department
"111111111 * 111111111 = 12345678987654321"
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