40 lines
972 B
C
40 lines
972 B
C
/* vim: tabstop=4 shiftwidth=4 noexpandtab
|
|
* This file is part of ToaruOS and is released under the terms
|
|
* of the NCSA / University of Illinois License - see LICENSE.md
|
|
* Copyright (C) 2016-2018 K. Lange
|
|
*
|
|
* nslookup - perform nameserver lookups
|
|
*
|
|
*/
|
|
#include <stdio.h>
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <getopt.h>
|
|
#include <sys/socket.h>
|
|
|
|
static void ip_ntoa(uint32_t src_addr, char * out) {
|
|
sprintf(out, "%d.%d.%d.%d",
|
|
(unsigned int)((src_addr & 0xFF000000) >> 24),
|
|
(unsigned int)((src_addr & 0xFF0000) >> 16),
|
|
(unsigned int)((src_addr & 0xFF00) >> 8),
|
|
(unsigned int)((src_addr & 0xFF)));
|
|
}
|
|
|
|
int main(int argc, char * argv[]) {
|
|
if (argc < 2) return 1;
|
|
|
|
struct hostent * host = gethostbyname(argv[1]);
|
|
|
|
if (!host) {
|
|
fprintf(stderr, "%s: not found\n", argv[1]);
|
|
return 1;
|
|
}
|
|
|
|
char addr[16] = {0};
|
|
ip_ntoa(*(uint32_t *)host->h_addr_list[0], addr);
|
|
|
|
fprintf(stderr, "%s: %s\n", host->h_name, addr);
|
|
return 0;
|
|
}
|