132 lines
2.9 KiB
C
132 lines
2.9 KiB
C
/* ----------------------------------------------------------------------- *
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*
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* Copyright 2001-2008 H. Peter Anvin - All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, Inc., 53 Temple Place Ste 330,
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* Boston MA 02111-1307, USA; either version 2 of the License, or
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* (at your option) any later version; incorporated herein by reference.
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*
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* ----------------------------------------------------------------------- */
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/*
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* gethostip.c
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*
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* Small program to use gethostbyname() to print out a hostname in
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* hex and/or dotted-quad notation
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <netdb.h>
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#include <sys/socket.h>
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#include <unistd.h>
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#include <sysexits.h>
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#define _GNU_SOURCE /* For getopt_long */
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#include <getopt.h>
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const struct option options[] = {
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{"hexadecimal", 0, NULL, 'x'},
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{"decimal", 0, NULL, 'd'},
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{"dotted-quad", 0, NULL, 'd'},
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{"full-output", 0, NULL, 'f'},
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{"name", 0, NULL, 'n'},
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{"help", 0, NULL, 'h'},
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{NULL, 0, NULL, 0}
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};
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const char *program;
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void usage(int exit_code)
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{
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fprintf(stderr, "Usage: %s [-dxnf] hostname/ip...\n", program);
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exit(exit_code);
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}
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int main(int argc, char *argv[])
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{
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int opt;
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int output = 0;
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int i;
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char *sep;
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int err = 0;
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struct hostent *host;
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program = argv[0];
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while ((opt = getopt_long(argc, argv, "dxfnh", options, NULL)) != -1) {
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switch (opt) {
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case 'd':
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output |= 2; /* Decimal output */
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break;
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case 'x':
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output |= 4; /* Hexadecimal output */
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break;
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case 'n':
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output |= 1; /* Canonical name output */
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break;
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case 'f':
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output = 7; /* Full output */
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break;
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case 'h':
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usage(0);
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break;
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default:
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usage(EX_USAGE);
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break;
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}
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}
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if (optind == argc)
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usage(EX_USAGE);
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if (output == 0)
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output = 7; /* Default output */
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for (i = optind; i < argc; i++) {
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sep = "";
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host = gethostbyname(argv[i]);
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if (!host) {
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herror(argv[i]);
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err = 1;
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continue;
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}
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if (host->h_addrtype != AF_INET || host->h_length != 4) {
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fprintf(stderr, "%s: No IPv4 address associated with name\n",
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argv[i]);
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err = 1;
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continue;
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}
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if (output & 1) {
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printf("%s%s", sep, host->h_name);
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sep = " ";
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}
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if (output & 2) {
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printf("%s%u.%u.%u.%u", sep,
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((unsigned char *)host->h_addr)[0],
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((unsigned char *)host->h_addr)[1],
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((unsigned char *)host->h_addr)[2],
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((unsigned char *)host->h_addr)[3]);
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sep = " ";
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}
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if (output & 4) {
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printf("%s%02X%02X%02X%02X", sep,
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((unsigned char *)host->h_addr)[0],
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((unsigned char *)host->h_addr)[1],
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((unsigned char *)host->h_addr)[2],
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((unsigned char *)host->h_addr)[3]);
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sep = " ";
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}
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putchar('\n');
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}
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return err;
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}
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