authenc.c

经典的unix下telnet的c代码

/*	$OpenBSD: authenc.c,v 1.6 2003/06/03 02:56:18 millert Exp $	*/
/*	$NetBSD: authenc.c,v 1.5 1996/02/28 21:03:52 thorpej Exp $	*/

/*-
 * Copyright (c) 1991, 1993
 *	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. 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.
 */

/*
RCSID("$Id: authenc.c,v 1.6 2003/06/03 02:56:18 millert Exp $");
*/

#include "telnet_locl.h"

#if	defined(AUTHENTICATION) || defined(ENCRYPTION)

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

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

	int
telnet_spin()
{
    extern int scheduler_lockout_tty;

    scheduler_lockout_tty = 1;
    Scheduler(0);
    scheduler_lockout_tty = 0;
    
    return 0;

}

	char *
telnet_getenv(val)
	const char *val;
{
	return((char *)env_getvalue((unsigned char *)val));
}

	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))) {
		strncpy(result, res, length);
		res = result;
	}
	TerminalNewMode(om);
	return(res);
}
#endif	/* defined(AUTHENTICATION) */