authenc.c

经典的unix下telnetd代码

/*-
 * 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.
 */

#include "telnetd.h"

/* RCSID("$KTH: authenc.c,v 1.10 2000/11/15 23:20:43 assar Exp $"); */

int
telnet_net_write(unsigned char *str, int len)
{
    if (nfrontp + len < netobuf + BUFSIZ) {
	memmove(nfrontp, str, len);
	nfrontp += len;
	return(len);
    }
    return(0);
}

#ifdef AUTHENTICATION
void
net_encrypt(void)
{
#ifdef ENCRYPTION
    char *s = (nclearto > nbackp) ? nclearto : nbackp;
    if (s < nfrontp && encrypt_output) {
	(*encrypt_output)((unsigned char *)s, nfrontp - s);
    }
    nclearto = nfrontp;
#endif
}

int
telnet_spin(void)
{
    return ttloop();
}

char *
telnet_getenv(const char *val)
{
    return(getenv(val));
}

char *
telnet_gets(char *prompt, char *result, int length, int echo)
{
    return NULL;
}
#endif