fingerd.c

来自「<B>Digital的Unix操作系统VAX 4.2源码</B>」· C语言 代码 · 共 129 行

#ifndef lint
static	char	*sccsid = "@(#)fingerd.c	4.1	(ULTRIX)	7/2/90";
#endif lint

/************************************************************************
 *									*
 *			Copyright (c) 1988 by				*
 *		Digital Equipment Corporation, Maynard, MA		*
 *			All rights reserved.				*
 *									*
 *   This software is furnished under a license and may be used and	*
 *   copied  only  in accordance with the terms of such license and	*
 *   with the  inclusion  of  the  above  copyright  notice.   This	*
 *   software  or  any  other copies thereof may not be provided or	*
 *   otherwise made available to any other person.  No title to and	*
 *   ownership of the software is hereby transferred.			*
 *									*
 *   This software is  derived  from  software  received  from  the	*
 *   University    of   California,   Berkeley,   and   from   Bell	*
 *   Laboratories.  Use, duplication, or disclosure is  subject  to	*
 *   restrictions  under  license  agreements  with  University  of	*
 *   California and with AT&T.						*
 *									*
 *   The information in this software is subject to change  without	*
 *   notice  and should not be construed as a commitment by Digital	*
 *   Equipment Corporation.						*
 *									*
 *   Digital assumes no responsibility for the use  or  reliability	*
 *   of its software on equipment which is not supplied by Digital.	*
 *									*
 ************************************************************************/

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */
/*
#ifndef lint
char copyright[] =
"Copyright (c) 1983 Regents of the University of California.\n\
 All rights reserved.\n";
#endif not lint

#ifndef lint
static char sccsid[] = "fingerd.c	5.1 (Berkeley) 6/6/85";
#endif not lint
*/

/*
 * Finger server.
 */
#include <sys/types.h>
#include <netinet/in.h>

#include <stdio.h>
#include <ctype.h>

main(argc, argv)
	char *argv[];
{
	register char *sp;
	char line[512];
	struct sockaddr_in sin;
	int i, p[2], pid, status;
	FILE *fp;
	char *av[4];

	i = sizeof (sin);
	if (getpeername(0, &sin, &i) < 0)
		fatal(argv[0], "getpeername");
	if (fgets(line, sizeof(line), stdin) == NULL)
		exit(1);
	sp = line;
	av[0] = "finger";
	i = 1;
	while (1) {
		while (isspace(*sp))
			sp++;
		if (!*sp)
			break;
		if (*sp == '/' && (sp[1] == 'W' || sp[1] == 'w')) {
			sp += 2;
			av[i++] = "-l";
		}
		if (*sp && !isspace(*sp)) {
			av[i++] = sp;
			while (*sp && !isspace(*sp))
				sp++;
			*sp = '\0';
		}
	}
	av[i] = 0;
	if (pipe(p) < 0)
		fatal(argv[0], "pipe");
	if ((pid = fork()) == 0) {
		close(p[0]);
		if (p[1] != 1) {
			dup2(p[1], 1);
			close(p[1]);
		}
		execv("/usr/ucb/finger", av);
		_exit(1);
	}
	if (pid == -1)
		fatal(argv[0], "fork");
	close(p[1]);
	if ((fp = fdopen(p[0], "r")) == NULL)
		fatal(argv[0], "fdopen");
	while ((i = getc(fp)) != EOF) {
		if (i == '\n')
			putchar('\r');
		putchar(i);
	}
	fclose(fp);
	while ((i = wait(&status)) != pid && i != -1)
		;
	return(0);
}

fatal(prog, s)
	char *prog, *s;
{

	fprintf(stderr, "%s: ", prog);
	perror(s);
	exit(1);
}