connections.c 23.6 KB
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/*
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 * $Id: connections.c,v 0.97 2003/07/12 22:26:32 ceder Exp $
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 * Copyright (C) 1991-2002  Lysator Academic Computer Association.
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 *
 * This file is part of the LysKOM server.
 * 
 * LysKOM is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by 
 * the Free Software Foundation; either version 1, or (at your option) 
 * any later version.
 * 
 * LysKOM is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with LysKOM; see the file COPYING.  If not, write to
 * Lysator, c/o ISY, Linkoping University, S-581 83 Linkoping, SWEDEN,
 * or the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, 
 * MA 02139, USA.
 *
 * Please mail bug reports to bug-lyskom@lysator.liu.se. 
 */
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/*
 * connections.c
 *
 * Denna fil inneh}ller niv}n ovanf|r isc.
 *
 * Created by Willf|r 31/3-90. Mostly written by ceder.
 */

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#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

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#include <errno.h>
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#include <stdio.h>
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#include <setjmp.h>
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#ifdef HAVE_STRING_H
#  include <string.h>
#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "timewrap.h"
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#include <sys/socket.h>
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#include <signal.h>
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#include <assert.h>
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#include "oop.h"

#include "unused.h"
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#include "ldifftime.h"
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#include "misc-types.h"
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#include "s-string.h"
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#include "kom-types.h"
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#include "kom-memory.h"
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#include "debug.h"
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#include "isc-interface.h"
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#include "com.h"
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#include "async.h"
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#include "connections.h"
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#include "internal-connections.h"
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#include "prot-a-parse-arg.h"
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#include "log.h"
#include "lyskomd.h"
#include "services.h"
#include "isc-parse.h"
#include "prot-a.h"
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#include "prot-a-parse.h"
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#include "server/smalloc.h"
#include "end-of-atomic.h"
#include "send-async.h"
#include "cache.h"
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#include "rfc931.h"
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#include "param.h"
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#include "kom-config.h"
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#include "kom-errno.h"
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#include "sigflags.h"
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#include "server-time.h"
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#include "aux-items.h"
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#include "eintr.h"
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#include "text-garb.h"
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#include "timeval-util.h"
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oop_source_sys * kom_server_oop_src = NULL;
struct isc_mcb * kom_server_mcb    = NULL;
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Connection     * active_connection = NULL;

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/*
 * This is set TRUE when the server should be closed. It is checked
 * each time around the main loop. It is set if someone with enough
 * privileges issues a `shutdown', or of lyskomd receives a SIGHUP.
 * This not an abort: all data is saved before we exit.
 */
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volatile sig_atomic_t go_and_die = 0;
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/*
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 * The number of times that the session penalties has been averaged.
 * Beware: this number will wrap around.
 */
static unsigned int penalty_generation = 0;

/*
 * These state variables are used to find out if we are busy or not.
 * When a packet arrives, data_available_callback() will set work_done
 * to TRUE and is_idle to FALSE.
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 */
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static Bool work_done = FALSE;
static Bool is_idle = FALSE;
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jmp_buf 	 parse_env;


const Fnc_descriptor fnc_defs[]={
#include "fnc-def-init.incl"
};

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const int num_fnc_defs = sizeof (fnc_defs) / sizeof (Fnc_descriptor);
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unsigned long service_statistics[sizeof (fnc_defs) / sizeof (Fnc_descriptor)];
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BUGDECL;

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static oop_call_fd data_available_callback;
static oop_call_time check_kill_flg;
static oop_call_time check_idle_callback;

static Connection *queue_first = NULL;
static Connection *queue_last = NULL;

static void
queue_add(Connection *c)
{
    assert(c->on_queue == FALSE);
    c->on_queue = TRUE;

    c->queue_prev = queue_last;
    c->queue_next = NULL;

    if (queue_first == NULL)
	queue_first = c;
    else
	queue_last->queue_next = c;

    queue_last = c;
}

static void
queue_remove(Connection *c)
{
    assert(c->on_queue == TRUE);
    c->on_queue = FALSE;

    if (c->queue_next != NULL)
	c->queue_next->queue_prev = c->queue_prev;
    else
	queue_last = c->queue_prev;
    
    if (c->queue_prev != NULL)
	c->queue_prev->queue_next = c->queue_next;
    else
	queue_first = c->queue_prev;
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    c->queue_prev = NULL;
    c->queue_next = NULL;
}

static void
set_time(void)
{
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    struct timeval last_time;
    static int limiter = 0;
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    last_time = current_time;
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    if (gettimeofday(&current_time, NULL) < 0)
    {
	if (limiter < 50)
	{
	    kom_log("WARNING: gettimeofday failed: %s\n", strerror(errno));
	    if (++limiter == 50)
		kom_log("WARNING: will not log the above message again.\n");
	}
    }

    if (timeval_less(current_time, last_time))
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    {
	kom_log("WARNING: Time is moving in the wrong direction.\n");
	/* FIXME (bug 62): Should we take more decisive action here? */
    }
}
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static void
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logout_client(Connection *cp)
{
    Connection *real_active_connection;
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    int ret;
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    if ( active_connection != NULL )
    {
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	kom_log("BUGCHK: logout_client(%ld): connection %ld is active.\n",
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	    cp->session_no, active_connection->session_no);
    }
    
    if ( cp->pers_no != 0 )
    {
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	int ctr = 0;

	if (active_connection != NULL)
	{
	    kom_log("WNG: logout_client(): active_connection != NULL\n");
	    if (ctr < 100)
		ctr++;
	    else
		kom_log("WNG: won't log the above message more\n");
	}

	real_active_connection = active_connection;
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	active_connection = cp;
	logout();
	active_connection = real_active_connection;
    }
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    else
    {
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#if 0
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	/* FIXME (bug 908): send a new async here instead.  This causes the
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	   elisp client to say that a secret (or unknown) person has
	   left the system.  */
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        async_logout( 0, cp->session_no );
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#endif
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    }
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    switch(cp->protocol)
    {
    case 0:			/* Hasn't yet allocated any protocol. */
	break;
	
    case 'A':
	prot_a_destruct(cp);
	break;
	
    default:
	restart_kom("logout_client(): Bad protocol.\n");
    }

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    ret = isc_destroy(kom_server_mcb, cp->isc_session);
    if (ret < 0)
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	kom_log("logout_client(): isc_destroyed returned %d\n", ret);
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    cp->isc_session = NULL;
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    if (cp->on_queue)
	queue_remove(cp);
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    kill_client(cp);		/* Free the Connection */
}

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/*
 * This function is part of the shutdown tidy-up sequence.
 */
void
logout_all_clients(void)
{
    Session_no sess = 0;
    Connection *conn;
    
    while ( (sess = traverse_connections (sess)) != 0)
    {
	conn = get_conn_by_number (sess);

	if ( conn == NULL )
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	    restart_kom("logout_all_clients(): cant get session %ld.\n",
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			sess);
	else
	    logout_client (conn);
    }

    if ( traverse_connections (0) != 0)
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	restart_kom("logout_all_clients(): traverse_connections(0) == %ld.\n",
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		    traverse_connections(0));
}

    
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/*
 * Call a function in services.c. A pointer to the result is returned.
 * The pointer points to static data which is overwritten on each call.
 */
static Success
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call_function(Connection *client,
	      union result_holder *res)
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{
    Success	status=FAILURE;	/* OK if the call was successful. */

    if ( active_connection != NULL )
    {
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	kom_log("call_function(%ld): active_connection = %ld\n",
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	    client->session_no, active_connection->session_no);
    }
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    if (client->function == illegal_fnc) 
    {
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        err_stat = 0;
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	kom_errno = KOM_NOT_IMPL;
	return FAILURE;
    }

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    active_connection = client;

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    service_statistics[client->function_index]++;
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#include "call-switch.incl"

    active_connection = NULL;

    return status;
}


static void
parse_packet(Connection *client)
{
    if ( client->protocol == '\0' ) /* Not known yet. */
    {
	client->protocol = parse_char(client);
	switch(client->protocol)
	{
	case 'A':
	    prot_a_init(client);
	    break;

	default:
	    client->protocol = '\0';
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	    isc_puts("%%LysKOM unsupported protocol.\n", client->isc_session);
	    isc_flush(client->isc_session);
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	    BUG(("%%%%Unsupported protocol.\n"));
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	    longjmp(parse_env, KOM_LOGOUT);
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	}
    }

    switch(client->protocol)
    {
    case 'A':
	prot_a_parse_packet(client);
	break;

    default:
	restart_kom("parse_packet(): Bad protocol.\n");
	break;
    }
}

/*
 * Free all parsed areas which are no longer needed. Re-initialize all
 * parse_pos fields so that the parse will expect a new function.
 *
 * This function is called
 *	when a parse error occurs
 *	when a parse is complete and the function has executed.
 */
static void
free_parsed(Connection *client)
{
    s_clear(&client->c_string0);
    s_clear(&client->c_string1);
    client->string0 = EMPTY_STRING; /* So that no one frees it. */
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    sfree(client->misc_info_list.misc);
    client->misc_info_list.misc = 0;
    client->misc_info_list.no_of_misc = 0;
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    s_clear(&client->aux_item.data);
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    s_clear(&client->dummy_aux_item.data);
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    sfree( client->c_local_text_no_p);
    client->c_local_text_no_p = NULL;
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    sfree(client->read_range_list.ranges);
    client->read_range_list.ranges = NULL;
    client->read_range_list.length = 0;
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    client->parse_pos = 0;
    client->fnc_parse_pos = 0;
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    client->array_parse_index = 0;
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    client->array_parse_parsed_length = 0;
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    client->array_parse_pos = 0;
    client->struct_parse_pos = 0;
    client->string_parse_pos = 0;
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    client->hunt_parse_pos = 0;
    client->array_hunt_num = 0;
    client->array_hunt_depth = 0;
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    sfree(client->num_list.data);
    client->num_list.data = NULL;
    client->num_list.length = 0;
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    free_aux_item_list(&client->aux_item_list);
    client->info.highest_aux_no = 0;
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}

/*
 * Send a reply to a call.
 */
static void
reply(Connection *client,
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      Success status,
      union result_holder *result)
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{
    switch(client->protocol)
    {
    case 'A':
	prot_a_reply(client, status, result);
	break;

    default:
	restart_kom("reply(): Bad protocol.\n");
	break;
    }
}


/*
 * Try to parse enough data from client->unparsed to call a function.
 * If more data is needed set client->more_to_parse to FALSE.
 */
static void
parse_unparsed(Connection *client)
{
    Success       status;
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    union result_holder result;
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    switch ( setjmp(parse_env) )
    {
    case 0 :
	/* Parse message. If message is complete call function and reply. */
	parse_packet(client);
	status = call_function(client, &result);
	reply(client, status, &result);
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	client->penalty += param.penalty_per_call;
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	free_parsed(client);
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	end_of_atomic();
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	break;

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    case KOM_PROTOCOL_ERR:
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	s_clear(&client->string0);
	free_parsed(client);
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	isc_puts("%% LysKOM protocol error.\n", client->isc_session);
	isc_flush(client->isc_session);
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	BUG(("%%%% Protocol error.\n"));
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	client->penalty += param.max_penalty;
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	s_clear(&client->unparsed);
	client->first_to_parse = 0;
	client->more_to_parse = FALSE;
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	end_of_atomic();
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	break;

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    case KOM_MSG_INCOMPLETE:
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	client->more_to_parse = FALSE;
	break;

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    case KOM_LOGOUT:
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	add_to_kill_list(client);
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	client->more_to_parse = FALSE;
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	break;
    }
}


/* Return 1 if the named file exists, 0 otherwise */
static int
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fexists(const char *filename)
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{
    struct stat buf;
    int code;
  
    code = !stat(filename, &buf);
    errno = 0;

    return code;
}


void
dump_statistics(void)
{
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    static struct timeval last_dump = {0, 0};
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    int i;
    FILE *fp;

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    if ((fp = i_fopen(param.statistic_name, "a")) == NULL)
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    {
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	kom_log("dump_statistics(): can't open file %s\n",
		param.statistic_name);
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	return;
    }

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    if (timeval_zero(last_dump))
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    {
	fprintf(fp, "RESTART\n");
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	last_dump = current_time;
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    }
    
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    fprintf(fp, "TIME: %s", ctime(&current_time.tv_sec));
    fprintf(fp, "SECONDS: %ld\n", timeval_diff_sec(current_time, last_dump));
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    fprintf(fp, "STATISTICS:");
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    /* The last entry corresponds to the dummy entry that is used to
       skip arguments to unimplemented requests.  Skip that, since it
       contains no useful statistics.  */
    for (i = 0; i < num_fnc_defs - 1; i++)
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    {
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	fprintf(fp, " %d:%lu", fnc_defs[i].function, service_statistics[i]);
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	service_statistics[i]=0;
    }

    fprintf(fp, "\n");
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    i_fclose(fp);
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    last_dump = current_time;
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}

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/* List of connections to kill. */

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static Session_no *kill_list = NULL;
static int kill_list_size = 0;
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static int kill_pending = 0;
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/* Schedule this client for termination. */
void
add_to_kill_list(Connection *conn)
{
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    oop_source *source;
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    int i;

    for (i = 0; i < kill_list_size; i++)
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	if (kill_list[i] == conn->session_no)
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	    return;

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    if (kill_list == NULL)
    {
	if (kill_list_size != 0)
	    restart_kom("add_to_kill_list(): size = %d\n", kill_list_size);

	kill_list_size = 1;
	kill_list = smalloc(sizeof(Session_no));
    }
    else
    {
	kill_list_size++;
	kill_list = srealloc(kill_list, kill_list_size * sizeof(Session_no));
    }

    kill_list[kill_list_size-1] = conn->session_no;
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    if (!kill_pending)
    {
	source = conn->isc_session->master->event_source;
	source->on_time(source, OOP_TIME_NOW, check_kill_flg, NULL);
	kill_pending = 1;
    }
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}
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void
dump_connections(void)
{
    Session_no s;
    Connection *conn;
    FILE *fp;

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    if ((fp = i_fopen(param.connection_status_file_tmp, "w")) == NULL)
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    {
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	kom_log("dump_connections(): can't open file %s: %s\n",
		param.connection_status_file_tmp, strerror(errno));
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	return;
    }

    for (s = 0; (s = traverse_connections(s)) != 0;)
    {
	conn = get_conn_by_number(s);
	fprintf(fp, "%d %lu %s\n", conn->isc_session->fd, conn->session_no,
		conn->peer);
    }

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    if (fflush(fp) != 0)
	kom_log("dump_connections(): fflush() says an error has occured.\n");
	
    if (ferror(fp))
	kom_log("dump_connections(): ferror() says an error has occured.\n");

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    if (i_fclose(fp) < 0)
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    {
	kom_log("dump_connections(): fclose failed: %s (ignored)\n",
		strerror(errno));
    }

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    errno = 0;
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    if (i_rename(param.connection_status_file_tmp,
		 param.connection_status_file) < 0)
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    {
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	kom_log("dump_connections(): can't rename %s to %s: %s\n",
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		param.connection_status_file_tmp,
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		param.connection_status_file,
		strerror(errno));
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    }
}


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/*
 * check_kill_flg must NEVER be called inside an atomic call!
 */
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static void *
check_kill_flg(oop_source *UNUSED(source),
	       struct timeval UNUSED(tv),
	       void *UNUSED(user))
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{
    Connection *conn;
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    Bool changed = FALSE;
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    kill_pending = 0;

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    if ( active_connection != NULL )
    {
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	restart_kom("check_kill_flg: active_connection == %ld",
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		    active_connection->session_no);
    }

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    while (kill_list_size > 0)
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    {
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	--kill_list_size;
	conn = get_conn_by_number (kill_list[kill_list_size]);
	if (conn == NULL)
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	{
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	    kom_log("check_kill_flg(): Connection %ld doesn't exist.\n",
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		kill_list[kill_list_size]);
	}
	else
	{
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	    logout_client(conn);
	    end_of_atomic();
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	    changed = TRUE;
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	}
    }
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    if (kill_list != NULL)
    {
	sfree (kill_list);
	kill_list = NULL;
    }
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    if (changed == TRUE)
	dump_connections();
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    return OOP_CONTINUE;
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}

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static char *
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get_host_name(union isc_address *addr)
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{
    char *res = NULL;
    char *hostname = NULL;
    struct timeval before;
    struct timeval after;
    double diff = -1.0;

    if (param.use_dns)
    {
	if (gettimeofday(&before, NULL) < 0)
	    kom_log("gettimeofday failed: %s\n", strerror(errno));

	res = hostname = isc_gethostname(addr, NULL, 0);

	if (gettimeofday(&after, NULL) < 0)
	    kom_log("gettimeofday failed: %s\n", strerror(errno));

	diff = (after.tv_sec - before.tv_sec
		+ 1e-6 * (after.tv_usec - before.tv_usec));
    }

    if (res == NULL)
	res = isc_getipnum(addr, NULL, 0);

    if (param.use_dns && diff > param.dns_log_threshold)
    {
	if (hostname == NULL)
	    kom_log("Slow bad DNS: %s failed after %f seconds\n", res, diff);
	else
	    kom_log("Slow DNS: got %s after %f seconds\n", res, diff);
    }

    return res;
}

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static void
write_err_cb(struct isc_mcb *UNUSED(cb_mcb),
	     struct isc_scb *UNUSED(cb_session),
	     int saved_errno,
	     void *user)
{
    Connection  * cp = user;
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    if (saved_errno != ECONNRESET)
	kom_log("Failed to write to client %lu from %s: %s\n",
		cp->session_no, cp->peer, strerror(saved_errno));
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    add_to_kill_list(cp);
}


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static void
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login_request(struct isc_scb *session)
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{
    Connection  * cp;
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    const char *realuser;
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    char *hostname = NULL;
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    char peername[256];
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    char portbuf[1+2+3*sizeof(long)];
    size_t hostlen;
    size_t portlen;
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    /* Supress logins if /etc/nologin exists */
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    if (fexists(param.nologin_file))
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    {
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	isc_puts("%% No logins allowed.\n", session);
	isc_flush(session);
 	isc_destroy(kom_server_mcb, session);
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	return;
    }

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    hostname = get_host_name(session->raddr);
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    if (hostname == NULL)
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	kom_log("WNG: login_request(): unknown hostid.\n");
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    /* Get the real user name, as returned by the Ident protocol (rfc 931). */
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    realuser = get_real_username(session, hostname);
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    if (realuser == NULL && param.authentication_level == 2)
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    {
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	kom_log("Connection from %s rejected - no IDENT available.\n", 
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	     hostname);
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	isc_puts("%% No IDENT server reachable at your site.\n",
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		 session);
	isc_flush(session);
	isc_destroy(kom_server_mcb, session);
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	return;
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    }
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    /* Create a Connection, and link the Connection and the
       isc_session together. */
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    cp = new_client();
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    cp->isc_session = session;
    session->udg = cp;
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    if (hostname == NULL)
	s_crea_str(&cp->hostname, "unknown");
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    else
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	s_crea_str(&cp->hostname, hostname);

    if (realuser != NULL)
	s_crea_str(&cp->ident_user, realuser);

    BUG(("\n[Client %lu from %s is connecting]\n", cp->session_no, hostname));
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    isc_getipnum(session->raddr, peername, sizeof(peername));
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    hostlen = strlen(peername);
    if (hostlen >= sizeof(peername)-1)
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    {
	kom_log("login_request(): truncated remote peer address %s.\n",
		peername);
    }
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    sprintf(portbuf, " %d", isc_getportnum(session->raddr));
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    portlen = strlen(portbuf);
    cp->peer = smalloc(hostlen + portlen + 1);
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    strcpy(cp->peer, peername);
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    strcpy(cp->peer + hostlen, portbuf);
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    dump_connections();
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    isc_set_read_callback(session, data_available_callback, write_err_cb, cp);
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}

static void
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adjust_penalty(Connection *conn)
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{
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    while (penalty_generation - conn->penalty_generation > 0)
    {
	conn->penalty /= 2;
	if (conn->penalty == 0)
	    conn->penalty_generation = penalty_generation;
	else
	    conn->penalty_generation++;
    }
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}


static void
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read_from_connection(Connection *conn)
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{
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    Bool would_block = FALSE;
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    adjust_penalty(conn);

    while (!would_block && !go_and_die && conn->penalty < param.max_penalty)
    {
	while (conn->more_to_parse
	       && !go_and_die && conn->penalty < param.max_penalty)
	    parse_unparsed(conn);

	if (go_and_die || conn->penalty >= param.max_penalty)
	    break;

	if (!conn->more_to_parse)
	{
	    switch (isc_read_data(conn->isc_session,
				  &conn->unparsed,
				  &conn->first_to_parse))
	    {
	    case ISC_READ_DATA:
		conn->penalty += param.penalty_per_read;
		conn->more_to_parse = TRUE;
		break;
	    case ISC_READ_ERROR:
		if (errno != ECONNRESET)
		    kom_log("Error reading from client: %s\n",
			    strerror(errno));
		/*FALLTHROUGH*/
	    case ISC_READ_LOGOUT:
		add_to_kill_list(conn);
		break;
	    case ISC_READ_WOULDBLOCK:
		would_block = TRUE;
		break;
	    case ISC_READ_NOMEM:
		restart_kom("isc_read_data() reports no memory\n");
	    }

	    if (!conn->more_to_parse)
		break;
	}
    }
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    /* Delete the parsed part of 'unparsed' */
    if (s_trim_left(&conn->unparsed, conn->first_to_parse) != OK)
	restart_kom("parse_unparsed: s_trim_left\n");
    conn->first_to_parse = 0;

    if (conn->penalty >= param.max_penalty)
    {
	isc_disable(conn->isc_session);
	queue_add(conn);
    }
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}

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static void
setup_timer(struct timeval *tv,
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	    struct timeval interval)
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{
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    static int errcnt = 0;

    if (gettimeofday(tv, NULL) < 0)
    {
	if (errcnt < 20)
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	{
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	    kom_log("setup_timer(): gettimeofday failed: %s\n",
		    strerror(errno));
	    if (++errcnt == 20)
		kom_log("setup_timer():"
			" will not log any more gettimeofday failures\n");
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	}
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	*tv = OOP_TIME_NOW;
    }
    else
    {
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	tv->tv_sec += interval.tv_sec;
	tv->tv_usec += interval.tv_usec;
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	if (tv->tv_usec > 1000000)
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	{
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	    tv->tv_usec -= 1000000;
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	    tv->tv_sec++;
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	}
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    }
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    assert(tv->tv_usec >= 0);
    assert(tv->tv_usec < 1000000);
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}

static void
enable_idle_check(void)
{
    oop_source *source = oop_sys_source(kom_server_oop_src);

    source->on_time(source, OOP_TIME_NOW, check_idle_callback, NULL);
}


static void *
check_idle_callback(oop_source *UNUSED(source),
		    struct timeval UNUSED(tv),
		    void *UNUSED(user))
{
    Connection *c;
    Connection *next;

    set_time();
    is_idle = !work_done;
    work_done = FALSE;

    if (is_idle && queue_first != NULL)
    {
	is_idle = FALSE;
	++penalty_generation;
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	for (next = queue_first; next != NULL; )
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	{
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	    c = next;
	    next = next->queue_next;
	    adjust_penalty(c);
	    if (c->penalty < param.low_penalty)
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	    {
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		queue_remove(c);
		isc_enable(c->isc_session);
		read_from_connection(c);
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	    }
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	}
    }

    if (!is_idle)
	enable_idle_check();

    return OOP_CONTINUE;
}

static void *
garb_callback(oop_source *UNUSED(source),
	      struct timeval UNUSED(tv),
	      void *user)
{
    struct timeval *next_timer = user;

    if (is_idle)
    {
	set_time();
	if (garb_text() == FALSE)
	    setup_timer(next_timer, param.garbtimeout);
	else
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	    setup_timer(next_timer, param.garb_interval);
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    }
    else
	setup_timer(next_timer, param.garb_busy_postponement);
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    source->on_time(source, *next_timer, garb_callback, user);
    return OOP_CONTINUE;
}
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static void *
saver_callback(oop_source *UNUSED(source),
	       struct timeval UNUSED(tv),
	       void *user)
{
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    struct timeval timeout;
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    struct timeval *next_timer = user;
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    timeout = end_of_atomic();
    setup_timer(next_timer, timeout);
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    source->on_time(source, *next_timer, saver_callback, user);
    return OOP_CONTINUE;
}
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static void *
data_available_callback(oop_source *source,
			int fd,
			oop_event event,
			void *user)
{
    Connection *conn = user;

    assert(event == OOP_READ);
    assert(conn->isc_session->fd == fd);
    assert(conn->isc_session->master->event_source == source);

    /* Something arrived, so we are busy.  */
    if (is_idle)
    {
	is_idle = FALSE;
	enable_idle_check();
    }
	
    work_done = TRUE;

    set_time();
    read_from_connection(conn);

    /* Check if the client issued a shutdown command.  */
    return go_and_die ? OOP_HALT : OOP_CONTINUE;
}


void *
handle_accept_event(struct isc_mcb *mcb,
		    struct isc_scb *UNUSED(accepting_session),
		    struct isc_scb *new_session)
{
    assert(mcb == kom_server_mcb);

    if (new_session->fd <= PROTECTED_FDS || new_session->fd >= fd_ceiling)
    {
	BUG(("Connection attempt rejected.\n"));
	isc_puts("%% No connections left.\n", new_session);
	isc_flush(new_session);
	isc_destroy(mcb, new_session);
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	async_rejected_connection();
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    }
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    else
	login_request(new_session);

    return OOP_CONTINUE;
}


void
toploop(void)
{
    struct timeval garb_timer;
    struct timeval saver_timer;

    void *exit_reason;
    oop_source *source = oop_sys_source(kom_server_oop_src);

    /* Start the garb right away. */
    garb_timer = OOP_TIME_NOW;
    source->on_time(source, garb_timer, garb_callback, &garb_timer);

    /* Hack to find out when we are idle. */
    source->on_time(source, OOP_TIME_NOW, check_idle_callback, NULL);

    /* Save the database even if we happen to be idle. */
    saver_timer = OOP_TIME_NOW;
    source->on_time(source, saver_timer, saver_callback, &saver_timer);

    exit_reason = oop_sys_run(kom_server_oop_src);

    if (exit_reason == OOP_ERROR)
	kom_log("ERROR: unexpected error from oop_sys_run: %s\n",
		strerror(errno));
    else if (exit_reason == OOP_CONTINUE)
	kom_log("ERROR: all oop sinks disappeared\n");
    else if (exit_reason != OOP_HALT)
	kom_log("ERROR: unexpected error from oop_sys_run: %s\n",
		strerror(errno));

    if (kill_pending)
    {
	source->cancel_time(source, OOP_TIME_NOW, check_kill_flg, NULL);
	kill_pending = 0;
    }

    if (is_idle == FALSE)
        source->cancel_time(source, OOP_TIME_NOW, check_idle_callback, NULL);

    source->cancel_time(source, saver_timer, saver_callback, &saver_timer);
    source->cancel_time(source, garb_timer, garb_callback, &garb_timer);
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}