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