authenc.cc

这是关于远程登陆TELNET 的源代码 已经测试过的。

/*-
 * Copyright (c) 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * From: @(#)authenc.c	5.1 (Berkeley) 3/1/91
 */
char au_rcsid[] = 
  "$Id: authenc.cc,v 1.6 2000/07/23 03:24:53 dholland Exp $";

#if	defined(ENCRYPT) || defined(AUTHENTICATE)
#include <sys/types.h>
#include <arpa/telnet.h>
#include <libtelnet/encrypt.h>
#include <libtelnet/misc.h>

#include "ring.h"
#include "externs.h"
#include "defines.h"
#include "types.h"
#include "proto.h"

	int
net_write(str, len)
	unsigned char *str;
	int len;
{
	if (NETROOM() > len) {
		netoring.supply_data(str, len);
		if (str[0] == IAC && str[1] == SE)
			printsub('>', &str[2], len-2);
		return(len);
	}
	return(0);
}

	void
net_encrypt()
{
#if	defined(ENCRYPT)
	if (encrypt_output)
		ring_encrypt(&netoring, encrypt_output);
	else
		ring_clearto(&netoring);
#endif
}

	int
telnet_spin()
{
	return(-1);
}

	char *
telnet_getenv(val)
	char *val;
{
	/* not sure about the export_only flag, but this code
	 * isn't used anyway --okir */
	return((char *)env_getvalue((unsigned char *)val, 1));
}

	char *
telnet_gets(prompt, result, length, echo)
	char *prompt;
	char *result;
	int length;
	int echo;
{
	extern char *getpass();
	extern int globalmode;
	int om = globalmode;
	char *res;

	TerminalNewMode(-1);
	if (echo) {
		printf("%s", prompt);
		res = fgets(result, length, stdin);
	} 
	else if ((res = getpass(prompt))!=NULL) {
		strncpy(result, res, length);
		res = result;
	}
	TerminalNewMode(om);
	return(res);
}
#endif