// simple nslookup program
//
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <fcntl.h>
#include <sys/io.h>
int main(int argc, char *argv[])
{
struct sockaddr_in ipv4_config;
struct hostent *host_config;
struct in_addr *inet_config;
char *ipv4_addr;
typedef int uint_32;
printf("[+] syn_nslookup program\n");
printf("[+] coding : Vanzoel\n\n");
if (argc < 2)
{
fprintf(stderr, "[+] Usage : %s <supported_ipv4_address>\n", argv[0]);
fprintf(stderr, "[+] Ex : %s ssl.facebook.com\n", argv[0]);
exit(1);
}
// dynamic allocating memory
host_config = (struct hostent *) malloc(sizeof(*host_config));
inet_config = (struct in_addr *) malloc(sizeof(*inet_config));
ipv4_addr = argv[1];
host_config = gethostbyname(ipv4_addr);
// based on BSD netinet/in.h, arpa/inet.h, netdb.h, sys/socket.h
// host address structure
/* struct hostent {
(official name of the host)
char *h_name;
(alternative names of the original host)
char **h_aliases;
(host address type, e.g : AF_INET, AF_INET6)
int h_addrtype;
(length of address, in bytes, of each address)
int h_length;
(vector of addresses for the host)
char **h_addr_list;
(this is a synonym for h_addr_list[0])
char *h_addr;
}; */
if (host_config == NULL)
{
fprintf(stderr, "[+] Unable to resolve address %s\n", argv[1]);
}
else
{
if (host_config)
{
printf("[+] Name : %s\n", host_config->h_name);
while (*host_config->h_aliases)
{
printf("[+] Alias : %s\n", *host_config->h_aliases++);
}
while (*host_config->h_addr_list)
{
bcopy(*host_config->h_addr_list++, (char *)inet_config, sizeof(inet_config));
printf("[+] Address : %s\n", inet_ntoa(*inet_config));
}
}
}
return 0;
}works in Debian Squeeze 6.02
compile : gcc -o syn_nslookup syn_nslookup.c
example :
[vanzoel@localhost:/home/zul/code-C ~] # ./sync facebook.com
[+] syn_nslookup program
[+] coding : Vanzoel
[+] Name : facebook.com
[+] Address : 69.63.181.12
[+] Address : 69.63.189.11
[+] Address : 69.63.189.16
thanks to Paulus Gandung Prakosa_ (0x1337day)
