4.3BSD-Reno/src/usr.bin/whois/whois.c

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted provided
 * that: (1) source distributions retain this entire copyright notice and
 * comment, and (2) distributions including binaries display the following
 * acknowledgement:  ``This product includes software developed by the
 * University of California, Berkeley and its contributors'' in the
 * documentation or other materials provided with the distribution and in
 * all advertising materials mentioning features or use of this software.
 * Neither the name of the University nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1980 Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)whois.c	5.9 (Berkeley) 6/1/90";
#endif /* not lint */

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>

#define	NICHOST	"nic.ddn.mil"

main(argc, argv)
	int argc;
	char **argv;
{
	extern char *optarg;
	extern int optind;
	register FILE *sfi, *sfo;
	register int ch;
	struct sockaddr_in sin;
	struct hostent *hp;
	struct servent *sp;
	int s;
	char *host;

	host = NICHOST;
	while ((ch = getopt(argc, argv, "h:")) != EOF)
		switch((char)ch) {
		case 'h':
			host = optarg;
			break;
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	if (argc != 1)
		usage();

	hp = gethostbyname(host);
	if (hp == NULL) {
		(void)fprintf(stderr, "whois: %s: ", host);
		herror((char *)NULL);
		exit(1);
	}
	host = hp->h_name;
	s = socket(hp->h_addrtype, SOCK_STREAM, 0);
	if (s < 0) {
		perror("whois: socket");
		exit(2);
	}
	bzero((caddr_t)&sin, sizeof (sin));
	sin.sin_family = hp->h_addrtype;
	if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
		perror("whois: bind");
		exit(3);
	}
	bcopy(hp->h_addr, (char *)&sin.sin_addr, hp->h_length);
	sp = getservbyname("whois", "tcp");
	if (sp == NULL) {
		(void)fprintf(stderr, "whois: whois/tcp: unknown service\n");
		exit(4);
	}
	sin.sin_port = sp->s_port;
	if (connect(s, &sin, sizeof(sin)) < 0) {
		perror("whois: connect");
		exit(5);
	}
	sfi = fdopen(s, "r");
	sfo = fdopen(s, "w");
	if (sfi == NULL || sfo == NULL) {
		perror("whois: fdopen");
		(void)close(s);
		exit(1);
	}
	(void)fprintf(sfo, "%s\r\n", *argv);
	(void)fflush(sfo);
	while ((ch = getc(sfi)) != EOF)
		putchar(ch);
	exit(0);
}

static
usage()
{
	(void)fprintf(stderr, "usage: whois [-h host] name\n");
	exit(1);
}