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Replace our telnetd with the one from heimdal-0.3f, with the following changes:
- obvious buildsystem tweakes
- our way to filter out bad environment variables

/*
 * Copyright (c) 1995 - 2000 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden).
 * 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 Institute 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 INSTITUTE 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 INSTITUTE 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.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
RCSID("$KTH: mini_inetd.c,v 1.28 2000/10/08 13:38:47 assar Exp $");
#endif

#include "telnetd.h"

#include <err.h>

#ifndef max
#define max(a,b) (((a)>(b))?(a):(b))
#endif

/*
 * accept a connection on `s' and pretend it's served by inetd.
 */

static void
accept_it (int s)
{
    int s2;

    s2 = accept(s, NULL, NULL);
    if(s2 < 0)
	err (1, "accept");
    close(s);
    dup2(s2, STDIN_FILENO);
    dup2(s2, STDOUT_FILENO);
    /* dup2(s2, STDERR_FILENO); */
    close(s2);
}

/*
 * Listen on `port' emulating inetd.
 */

void
mini_inetd (int port)
{
    int error, ret;
    struct addrinfo *ai, *a, hints;
    char portstr[NI_MAXSERV];
    int n, nalloc, i;
    int *fds;
    fd_set orig_read_set, read_set;
    int max_fd = -1;

    memset (&hints, 0, sizeof(hints));
    hints.ai_flags    = AI_PASSIVE;
    hints.ai_socktype = SOCK_STREAM;

    snprintf (portstr, sizeof(portstr), "%d", ntohs(port));

    error = getaddrinfo (NULL, portstr, &hints, &ai);
    if (error)
	errx (1, "getaddrinfo: %s", gai_strerror (error));

    for (nalloc = 0, a = ai; a != NULL; a = a->ai_next)
	++nalloc;

    fds = malloc (nalloc * sizeof(*fds));
    if (fds == NULL)
	errx (1, "mini_inetd: out of memory");

    FD_ZERO(&orig_read_set);

    for (i = 0, a = ai; a != NULL; a = a->ai_next) {
	fds[i] = socket (a->ai_family, a->ai_socktype, a->ai_protocol);
	if (fds[i] < 0) {
	    warn ("socket");
	    continue;
	}
	socket_set_reuseaddr (fds[i], 1);
	if (bind (fds[i], a->ai_addr, a->ai_addrlen) < 0)
	    err (1, "bind");
	if (listen (fds[i], SOMAXCONN) < 0)
	    err (1, "listen");
	if (fds[i] >= FD_SETSIZE)
	    errx (1, "fd too large");
	FD_SET(fds[i], &orig_read_set);
	max_fd = max(max_fd, fds[i]);
	++i;
    }
    freeaddrinfo (ai);
    if (i == 0)
	errx (1, "no sockets");
    n = i;

    do {
	read_set = orig_read_set;

	ret = select (max_fd + 1, &read_set, NULL, NULL, NULL);
	if (ret < 0 && errno != EINTR)
	    err (1, "select");
    } while (ret <= 0);

    for (i = 0; i < n; ++i)
	if (FD_ISSET (fds[i], &read_set)) {
	    accept_it (fds[i]);
	    return;
	}
    abort ();
}