connections.c 18.7 KB
Newer Older
Linus Tolke Y's avatar
Linus Tolke Y committed
1
/*
Per Cederqvist's avatar
Per Cederqvist committed
2
 * $Id: connections.c,v 0.12 1992/02/26 18:45:19 ceder Exp $
Linus Tolke Y's avatar
Linus Tolke Y committed
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
 * Copyright (C) 1991  Lysator Academic Computer Association.
 *
 * 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. 
 */
Per Cederqvist's avatar
Per Cederqvist committed
25 26 27 28 29 30 31 32
/*
 * connections.c
 *
 * Denna fil inneh}ller niv}n ovanf|r isc.
 *
 * Created by Willf|r 31/3-90. Mostly written by ceder.
 */

Per Cederqvist's avatar
Per Cederqvist committed
33
static char *rcsid = "$Id: connections.c,v 0.12 1992/02/26 18:45:19 ceder Exp $";
Per Cederqvist's avatar
Per Cederqvist committed
34 35


Per Cederqvist's avatar
Per Cederqvist committed
36 37 38 39 40 41 42
#include <errno.h>
#include <setjmp.h>
#include <sys/types.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <time.h>
#include <sys/time.h>
Per Cederqvist's avatar
Per Cederqvist committed
43
#include <string.h>
Per Cederqvist's avatar
Per Cederqvist committed
44

Per Cederqvist's avatar
Per Cederqvist committed
45
#include "s-string.h"
Per Cederqvist's avatar
Per Cederqvist committed
46 47 48 49 50 51 52
#include <kom-types.h>
#include "lyskomd.h"
#include <config.h>
#include <debug.h>
#include "end-of-atomic.h"
#include "log.h"
#include <services.h>
53
#include "isc-interface.h"
Per Cederqvist's avatar
Per Cederqvist committed
54 55 56 57 58 59
#include <kom-errno.h>
#include "com.h"
#include "connections.h"
#include "prot-a-parse.h"
#include "prot-a-output.h"
#include "prot-a.h"
60
#include <server/smalloc.h>
Per Cederqvist's avatar
Per Cederqvist committed
61 62 63 64 65 66 67 68 69 70 71
#include "prot-a-parse-arg.h"
#include "isc-parse.h"
#include "cache.h"
#include "send-async.h"
#include "mux.h"
#include "mux-parse.h"
#include "internal-connections.h"

ISCMCB         * kom_server_mcb    = NULL;
Connection     * active_connection = NULL;

Per Cederqvist's avatar
Per Cederqvist committed
72 73 74 75 76 77
/*
 * 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.
 */
78
volatile Bool	 go_and_die = FALSE;
Per Cederqvist's avatar
Per Cederqvist committed
79 80 81 82 83 84 85 86 87

/*
 * Once upon a time the entire database was always held in core, and
 * saved to disk when we got a SIGUSR1 signal. Nowadays the server
 * keeps track of the time itself and saves at appropriate intervalls.
 * It does still write some statistics when it get a SIGUSR1 signal.
 * The signal handler sets do_sync_db. The name is retained for
 * historical reasons.
 */
88
volatile Bool	 do_sync_db = FALSE;
Per Cederqvist's avatar
Per Cederqvist committed
89 90 91 92 93 94 95 96 97 98 99 100 101 102

jmp_buf 	 parse_env;


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

u_long service_statistics[sizeof (fnc_defs) / sizeof (Fnc_descriptor)];

BUGDECL;



Per Cederqvist's avatar
Per Cederqvist committed
103
static void
Per Cederqvist's avatar
Per Cederqvist committed
104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152
logout_client(Connection *cp)
{
    Connection *real_active_connection;

    if ( active_connection != NULL )
    {
	log("BUGCHK: logout_client(%d): connection %d is active.\n",
	    cp->session_no, active_connection->session_no);
    }
    
    switch (cp->magic)
    {
    case CONN_MAGIC_ALLOC:
        break;

    case CONN_MAGIC_FREE:
	log("LOGOUT_CLIENT: Trying to free freed Connection - ignored!\n");
	return;

    default:
	restart_kom("LOGOUT_CLIENT: Bad magic number\n");
    }

    if ( cp->pers_no != 0 )
    {
	real_active_connection = active_connection; /* Shouldn't be needed +++ */
	active_connection = cp;
	logout();
	active_connection = real_active_connection;
    }

    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");
    }

    mux_close(cp);		/* Close fd's. Clear mux and isc structures. */

    kill_client(cp);		/* Free the Connection */
}

Per Cederqvist's avatar
Per Cederqvist committed
153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178
/*
 * 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 )
	    restart_kom("logout_all_clients(): cant get session %d.\n",
			sess);
	else
	    logout_client (conn);
    }

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

    
Per Cederqvist's avatar
Per Cederqvist committed
179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400
    

    
/*
 * 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
call_function (Connection  * client,
	       Result_holder   * res)     /* This is a union. */
{
    Success	status=FAILURE;	/* OK if the call was successful. */

    if ( active_connection != NULL )
    {
	log("call_function(%d): active_connection = %d",
	    client->session_no, active_connection->session_no);
    }
    
    active_connection = client;

    service_statistics[client->function]++;

#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';
	    mux_printf(client,
		    "%%%%LysKOM unsupported protocol.\n");
	    mux_flush(client);
	    BUG(("%%%%Unsupported protocol.\n"));
	    longjmp(parse_env, ISC_LOGOUT);
	}
    }

    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. */
    sfree( client->c_misc_info_p);
    client->c_misc_info_p = NULL;
    sfree( client->c_local_text_no_p);
    client->c_local_text_no_p = NULL;
    client->parse_pos = 0;
    client->fnc_parse_pos = 0;
    client->array_parse_pos = 0;
    client->struct_parse_pos = 0;
    client->string_parse_pos = 0;
}

/*
 * Send a reply to a call.
 */
static void
reply(Connection *client,
      Success	      status,
      Result_holder  *result)
{
    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)
{
    String        tmp_str = EMPTY_STRING;
    Success       status;
    Result_holder result;
        
    switch ( setjmp(parse_env) )
    {
    case 0 :
	/* Parse message. If message is complete call function and reply. */
	parse_packet(client);
	client->last_request = time(NULL);
	status = call_function(client, &result);
	reply(client, status, &result);
	free_parsed(client);
	end_of_atomic(FALSE);
	break;

    case ISC_PROTOCOL_ERR:
	s_clear(&client->string0);
	free_parsed(client);
	mux_printf(client, "%% LysKOM protocol error.\n");
	mux_flush(client);
	BUG(("%%%% Protocol error.\n"));
	s_clear(&client->unparsed);
	client->first_to_parse = 0;
	client->more_to_parse = FALSE;
	end_of_atomic(FALSE);
	break;

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

    case ISC_LOGOUT:
	client->kill_me = TRUE;
	break;
    }
    
    /* Delete the parsed part of 'unparsed' */
    
    if ( s_substr(&tmp_str, client->unparsed,
		  client->first_to_parse, END_OF_STRING) != OK )
	restart_kom("parse_unparsed: s_substr\n");

    s_clear(&client->unparsed);
    client->unparsed = tmp_str;
    client->first_to_parse = 0;
}


/*
 * There is a message in the event. Parse it.
 */
static void
parse_message(Connection *cp, String tmp_str)
{
    VBUGSTR(tmp_str);

    cp->more_to_parse = TRUE;
    
    if ( s_strcat(&cp->unparsed, tmp_str) != OK )
	restart_kom("parse_message(): s_strcat\n");

    tmp_str = EMPTY_STRING;
    
    /* Parse this packet, but leave the last token if it isn't complete. */

    parse_unparsed(cp);

    return;
}

static void
mux_handle_packet(Mux *mux)
{
    Mux_client *mcp = NULL;
    Connection *cp = NULL;

    switch(mux->parse.function)
    {
    case 0:			/* ping */
	isc_printf(mux->scb, "0\n");
	isc_flush(mux->scb);
	break;

    case 1:			/* login */

	mcp = mux_getclientbyid(mux, mux->parse.num);
	if (mcp)
	{			/* ERROR %d: Already logged in\n */
	    isc_printf(mux->scb, "4\n");
	    isc_flush(mux->scb);
	    return;
	}
    
	cp = new_client();
	cp->mux = mux;
	cp->hostname = mux->parse.string;
	mux->parse.string = EMPTY_STRING;
	
	mux_addclient(mux, mux->parse.num, cp);

    
	BUG(("\n[Client %d from %.*s via MUX %s",
	     cp->session_no,
Per Cederqvist's avatar
Per Cederqvist committed
401
	     (int)cp->hostname.len,
Per Cederqvist's avatar
Per Cederqvist committed
402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443
	     cp->hostname.string,
	     mux->scb->info.tcp.hostname));
	BUG((" is connecting]\n"));

	break;
    
    case 2:			/* logout */
	mcp = mux_getclientbyid(mux, mux->parse.num);
	if (!mcp)
	{			/* ERROR %d: No such mux-session */
	    isc_printf(mux->scb, "4\n");
	    isc_flush(mux->scb);
	    return;
	}

	cp = mcp->conn;
    
	BUG(("\n[Client %d via MUX(%s)",
	     cp->session_no,
	     mux->scb->info.tcp.hostname));
	BUG((" is logging out by request]\n"));

#if 0
	logout_client(cp);
	end_of_atomic(FALSE);	/* ??? */
#else
	cp->kill_me = TRUE;
#endif
	break;

    case 3:			/* msg */
	mcp = mux_getclientbyid(mux, mux->parse.num);
	if (!mcp)
	{			/* ERROR %d: No such mux-session */
	    isc_printf(mux->scb, "4\n");
	    isc_flush(mux->scb);
	    return;
	}
    
	cp = mcp->conn;
    
	VBUG(("\n[Message client %d via MUX #%d]\n",
Per Cederqvist's avatar
Per Cederqvist committed
444
	      cp->session_no, (int)mux->scb));
Per Cederqvist's avatar
Per Cederqvist committed
445 446 447 448 449 450 451

	parse_message(cp, mux->parse.string);
	break;

    default:
	
	VBUG(("\nMUX Protocol error from MUX #%d]\n",
Per Cederqvist's avatar
Per Cederqvist committed
452
	      (int)mux->scb));
Per Cederqvist's avatar
Per Cederqvist committed
453 454 455 456 457 458 459 460

	isc_printf(mux->scb, "5\n");
	isc_flush(mux->scb);
	break;
	
    }
}
	
Per Cederqvist's avatar
Per Cederqvist committed
461
static void
Per Cederqvist's avatar
Per Cederqvist committed
462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539
mux_logout(Mux *mp)
{
    int i;

    for (i = 0; i < mp->client_c; i++)
	if (mp->client_v[i].conn)
	{
	    BUG(("\n[Client %d via MUX(%s)",
		 mp->client_v[i].conn->session_no,
		 mp->scb->info.tcp.hostname));
	    BUG((" is logging out by MUX shutdown]\n"));
	    logout_client(mp->client_v[i].conn);
	    end_of_atomic(FALSE);
	}
	      
    isc_close(mp->scb);
    mux_destruct(mp);
}


static void
mux_parse_unparsed(Mux *mux)
{
    String        tmp_str;

    while ( mux->parse.more_to_parse )
    {
	switch ( setjmp(mux_parse_env) )
	{
	case 0 :
	    /* Parse message. Take apropriate action if message is complete. */
	    mux_parse_packet(mux);
	    mux_handle_packet(mux);
	    mux_free_parsed(mux);
	    break;

	case MUX_PROTOCOL_ERR:
	    s_clear(&mux->parse.string);
	    mux_free_parsed(mux);
	    isc_printf(mux->scb, "5\n");
	    isc_flush(mux->scb);
	    BUG(("%%%% Mux protocol error.\n"));
	    s_clear(&mux->parse.unparsed);
	    mux->parse.first_to_parse = 0;
	    mux->parse.more_to_parse = FALSE;
	    break;

	case MUX_MSG_INCOMPLETE:
	    mux->parse.more_to_parse = FALSE;
	    break;

	case MUX_LOGOUT:
	    mux_logout(mux);
	    return;
	}
    
	/* Delete the parsed part of 'unparsed' */

	tmp_str = EMPTY_STRING;

	if ( s_substr(&tmp_str, mux->parse.unparsed,
		      mux->parse.first_to_parse, END_OF_STRING) != OK )
	    restart_kom("mux_parse_unparsed: s_substr\n");

	s_clear(&mux->parse.unparsed);
	mux->parse.unparsed = tmp_str;
	mux->parse.first_to_parse = 0;
    }
}


static void
mux_parse_message(Mux *mp, String tmp_str)
{
    VBUGSTR(tmp_str);

    BUG(("mux_parse_message(): mp->parse.unparsed = { len = %d, "
	 "string = %p }\n", mp->parse.unparsed.len,
Per Cederqvist's avatar
Per Cederqvist committed
540
	 (void *)mp->parse.unparsed.string));
Per Cederqvist's avatar
Per Cederqvist committed
541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558
    
    if ( s_strcat(&mp->parse.unparsed, tmp_str) != OK )
	restart_kom("mux_parse_message(): s_strcat\n");

    tmp_str = EMPTY_STRING;
    
    /* Parse this packet, but leave the last token if it isn't complete. */

    mux_parse_unparsed(mp);

    return;
}

/*
 * parse data in client->unparsed and mux->unparsed if there
 * is data that has not yet been taken care of. Return TRUE
 * if there was no data to take care of.
 */
Per Cederqvist's avatar
Per Cederqvist committed
559 560
static Bool
parse_forgotten(void)
Per Cederqvist's avatar
Per Cederqvist committed
561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585
{
    Bool flg = FALSE;			/* Was there anything? */
    Connection *ci;
    Session_no session_no = 0;

    if ( traverse_connections(0) == 0 )
	return TRUE;

    while ( ( session_no = traverse_connections( session_no ) ) != 0 )
    {
	ci = get_conn_by_number (session_no);

	if ( ci->more_to_parse )
	{
	    parse_unparsed(ci);
	    flg = TRUE;
	}
    }

    return !flg;
}


/* Return 1 if the named file exists, 0 otherwise */
static int
Per Cederqvist's avatar
Per Cederqvist committed
586
fexists(const char *filename)
Per Cederqvist's avatar
Per Cederqvist committed
587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699
{
    struct stat buf;
    int code;
  
    code = !stat(filename, &buf);
    errno = 0;

    return code;
}


void
dump_statistics(void)
{
    static time_t last_dump = NO_TIME;
    int i;
    time_t now;
    FILE *fp;
    extern char statisticfile[1024]; /* Defined in ramkomd.c */

    if ( (fp = fopen(statisticfile, "a")) == NULL )
    {
	log(__FILE__ ": dump_statistics(): can't open file %s\n",
	    statisticfile);
	return;
    }

    time(&now);

    if (last_dump == NO_TIME)
    {
	fprintf(fp, "RESTART\n");
	last_dump = now;
    }
    
    fprintf(fp, "TIME: %s", ctime(&now));
    fprintf(fp, "SECONDS: %d\n", (int)difftime(now, last_dump));
    fprintf(fp, "STATISTICS:");
    for ( i = 0; i < sizeof(service_statistics) / sizeof(u_long); i++)
    {
	fprintf(fp, " %lu", service_statistics[i]);
	service_statistics[i]=0;
    }

    fprintf(fp, "\n");
    fclose(fp);

    last_dump = now;
}


/*
 * check_kill_flg must NEVER be called inside an atomic call!
 */
static void
check_kill_flg(void)
{
    Session_no  i = 0;
    Connection *conn;

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

    while ( (i = traverse_connections (i)) != 0 )
    {
	conn = get_conn_by_number(i);

	if ( conn->kill_me == TRUE )
	{
	    logout_client(conn);
	    end_of_atomic(FALSE);
	}
    }
}

static void
login_request(ISCECB  *event)
{
    Connection  * cp;

    if (isc_sessions(kom_server_mcb) >= MAX_NO_OF_CONNECTIONS)
    {
	BUG(("Connection attempt rejected.\n"));
	isc_printf(event->session, "%s", "%% No connections left.\n");
	isc_flush(event->session);
	isc_close(event->session);
	      
	async_rejected_connection();
	return;
    }

    /* Supress logins if /etc/nologin exists */
    if (fexists("/etc/nologin"))
    {
	isc_printf(event->session, "%s", "%% No logins allowed.\n");
	isc_flush(event->session);
	isc_close(event->session);
	return;
    }

    if (event->session->info.tcp.listen == listen_mux)
    {
	/* Multiplexer requesting connection */

	/*
	 ** Create, and setup the MUX for the MUX case
	 */
	event->session->udg = mux_create(MUX_TYPE_MUX, event->session);
	      
	BUG(("MUX #%d at %s connecting.\n",
Per Cederqvist's avatar
Per Cederqvist committed
700
	     (int)event->session, event->session->info.tcp.hostname));
Per Cederqvist's avatar
Per Cederqvist committed
701 702 703 704 705 706 707 708 709 710 711 712 713
    }
    else
    {
	/* Client requesting connection */
	      
	/*
	 ** Create, and setup the MUX for the CLIENT case
	 */
	event->session->udg = mux_create(MUX_TYPE_CLIENT,
					 event->session);
	      
	cp = new_client();
	cp->mux = event->session->udg;
Per Cederqvist's avatar
Per Cederqvist committed
714
	s_crea_str(&cp->hostname, event->session->info.tcp.hostname);
Per Cederqvist's avatar
Per Cederqvist committed
715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730
	      
	mux_addclient(event->session->udg, 0, cp);
	      
	BUG(("\n[Client %d from %s", cp->session_no,
	     event->session->info.tcp.hostname));
	BUG((" is connecting]\n"));
    }	      
}

static void
logout_request(ISCECB *event)
{
    Connection  * cp;
    
    if (event->session->udg->type == MUX_TYPE_MUX)
    {
Per Cederqvist's avatar
Per Cederqvist committed
731
	BUG(("\n[MUX #%d at %s", (int)event->session,
Per Cederqvist's avatar
Per Cederqvist committed
732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761
	     event->session->info.tcp.hostname));
	BUG((" is logging out]\n"));

	/*
	 ** Logout any remaining clients
	 */
	mux_logout(event->session->udg);
    }
    else
    {
	cp = event->session->udg->client_v[0].conn;
	      
	BUG(("\n[Client %d from %s", cp->session_no,
	     event->session->info.tcp.hostname));
	BUG((" is logging out]\n"));
	      
	cp->kill_me = TRUE;
    }
}


static void
message_request(ISCECB *event)
{
    Connection *cp;
    String      tmp_str;

    if (event->session->udg->type == MUX_TYPE_MUX)
    {
	event->session->udg->parse.more_to_parse = TRUE;
762
	tmp_str.string = (unsigned char *)event->msg->buffer;
Per Cederqvist's avatar
Per Cederqvist committed
763 764 765 766 767 768 769 770 771 772 773
	tmp_str.len    = event->msg->length;
	mux_parse_message(event->session->udg, tmp_str);
    }
    else
    {
	cp = event->session->udg->client_v[0].conn;
	VBUG(("\n[Message from client %d]\n",
	      cp->session_no));
	/*
	 ** Pass the message on to the parser
	 */
774
	tmp_str.string = (unsigned char *)event->msg->buffer;
Per Cederqvist's avatar
Per Cederqvist committed
775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801
	tmp_str.len    = event->msg->length;
	parse_message(cp, tmp_str);
    }
}

static long
timevaldiff(struct timeval a,
	    struct timeval b)
{
    return 1000000 * (a.tv_sec - b.tv_sec) + a.tv_usec - b.tv_usec;
}

void
toploop(void)
{
    ISCECB      * event;
    Bool	pending_input = TRUE; /* Should be TRUE whenever there
				         is or might be pending input
					 from any client in the unparsed
					 buffer. */
    long	timeout = TIMEOUT;    /* In milliseconds. */
    struct timeval before, after;
    
    while ( !go_and_die )
    {
        if (do_sync_db)
	{
Per Cederqvist's avatar
Per Cederqvist committed
802 803 804 805 806
	    /*
	     * do_sync_db used to save the entire database. Nowadays
	     * all it does is to print some statistics.
	     */
	    cache_sync();	/* A noop in lyskomd. Actually
Per Cederqvist's avatar
Per Cederqvist committed
807 808 809
				   stops the server and dumps
				   everything in ramkomd. */
	    dump_statistics();
Per Cederqvist's avatar
Per Cederqvist committed
810
	    do_sync_db = FALSE;
Per Cederqvist's avatar
Per Cederqvist committed
811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879
	}

	gettimeofday(&before, NULL);
	event = isc_getnextevent(kom_server_mcb,
				 pending_input ? 0 : timeout );
	gettimeofday(&after, NULL);

	timeout -= timevaldiff(after, before) / 1000;

	if ( timeout < 0 )
	    timeout = 0;
	
	if ( event == NULL )
	    restart_kom("toploop(): Got NULL event - shouldn't happen...\n");

	switch ( event->event )
	{
	case ISC_EVENT_ERROR:
	    if (errno != EINTR)
	    {
		log("toploop: ISC_EVENT_ERROR (error = '%s'):\n   '%s'\n",
		    strerror(errno), event->msg ? event->msg->buffer
		    : "(unknown)");
	    }
	    break;
	    
	case ISC_EVENT_TIMEOUT:
	    BUG((">"));
#ifdef DEBUG
	    fflush(stdout);
#endif
	    if ( pending_input == FALSE )
		timeout = end_of_atomic(TRUE); /* Idle. Do some cleaning up. */
	    else
	    {
		if ( timeout == 0 )
		    end_of_atomic(FALSE);
		pending_input = !parse_forgotten();
	    }
	    
	    	    
	    break;
	    
	case ISC_EVENT_LOGIN:
	    pending_input = TRUE;
	    login_request(event);
	    break;

	case ISC_EVENT_LOGOUT:
	    pending_input = TRUE;
	    logout_request(event);
	    break;

 	case ISC_EVENT_MESSAGE:
	    pending_input = TRUE;
	    message_request(event);
	    break;

	default:
	    pending_input = TRUE;
	    log("ERROR: toploop(): Unknown ISC_EVENT\n");
	    break;
	}

        isc_dispose(event);

	check_kill_flg();
    }
}