connections.c 19.7 KB
Newer Older
Linus Tolke Y's avatar
Linus Tolke Y committed
1
/*
2
 * $Id: connections.c,v 0.85 2002/10/27 23:02:52 ceder Exp $
Per Cederqvist's avatar
Per Cederqvist committed
3
 * Copyright (C) 1991-2002  Lysator Academic Computer Association.
Linus Tolke Y's avatar
Linus Tolke Y committed
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
 *
 * 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.
 */

David Byers's avatar
David Byers committed
33 34 35 36 37

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

Per Cederqvist's avatar
Per Cederqvist committed
38
#include <errno.h>
Per Cederqvist's avatar
Per Cederqvist committed
39
#include <stdio.h>
Per Cederqvist's avatar
Per Cederqvist committed
40
#include <setjmp.h>
Per Cederqvist's avatar
Per Cederqvist committed
41 42 43
#ifdef HAVE_STRING_H
#  include <string.h>
#endif
Per Cederqvist's avatar
Per Cederqvist committed
44
#include <sys/types.h>
Per Cederqvist's avatar
Per Cederqvist committed
45
#include <sys/stat.h>
Per Cederqvist's avatar
Per Cederqvist committed
46
#ifdef TIME_WITH_SYS_TIME
47 48
#  include <sys/time.h>
#  include <time.h>
Per Cederqvist's avatar
Per Cederqvist committed
49
#else
50 51 52 53 54
#  ifdef HAVE_SYS_TIME_H
#    include <sys/time.h>
#  else
#    include <time.h>
#  endif
Per Cederqvist's avatar
Per Cederqvist committed
55
#endif
56
#include <sys/socket.h>
57
#include <signal.h>
Per Cederqvist's avatar
Per Cederqvist committed
58

59
#include "ldifftime.h"
Per Cederqvist's avatar
Per Cederqvist committed
60
#include "misc-types.h"
61
#include "s-string.h"
Per Cederqvist's avatar
Per Cederqvist committed
62
#include "kom-types.h"
63
#include "kom-memory.h"
Per Cederqvist's avatar
Per Cederqvist committed
64
#include "debug.h"
65
#include "isc-interface.h"
Per Cederqvist's avatar
Per Cederqvist committed
66
#include "com.h"
67
#include "async.h"
Per Cederqvist's avatar
Per Cederqvist committed
68
#include "connections.h"
Per Cederqvist's avatar
Per Cederqvist committed
69
#include "internal-connections.h"
Per Cederqvist's avatar
Per Cederqvist committed
70
#include "prot-a-parse-arg.h"
Per Cederqvist's avatar
Per Cederqvist committed
71 72 73 74 75
#include "log.h"
#include "lyskomd.h"
#include "services.h"
#include "isc-parse.h"
#include "prot-a.h"
76
#include "prot-a-parse.h"
Per Cederqvist's avatar
Per Cederqvist committed
77 78 79 80
#include "server/smalloc.h"
#include "end-of-atomic.h"
#include "send-async.h"
#include "cache.h"
81
#include "rfc931.h"
82
#include "param.h"
David Byers's avatar
David Byers committed
83
#include "kom-config.h"
84
#include "kom-errno.h"
Per Cederqvist's avatar
Per Cederqvist committed
85
#include "sigflags.h"
Per Cederqvist's avatar
Per Cederqvist committed
86
#include "server-time.h"
87
#include "aux-items.h"
Per Cederqvist's avatar
Per Cederqvist committed
88

Per Cederqvist's avatar
Per Cederqvist committed
89
IscMaster      * kom_server_mcb    = NULL;
Per Cederqvist's avatar
Per Cederqvist committed
90 91
Connection     * active_connection = NULL;

Per Cederqvist's avatar
Per Cederqvist committed
92 93 94 95 96 97
/*
 * 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.
 */
98
volatile sig_atomic_t go_and_die = 0;
Per Cederqvist's avatar
Per Cederqvist committed
99 100

/*
101 102
 * The lyskomd server will dump some statistics when it receives a
 * SIGUSR1 signal.  The signal handler sets the do_statistics flag.
Per Cederqvist's avatar
Per Cederqvist committed
103
 */
104
volatile sig_atomic_t do_statistics = 0;
Per Cederqvist's avatar
Per Cederqvist committed
105 106 107 108 109 110 111 112

jmp_buf 	 parse_env;


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

113
const int num_fnc_defs = sizeof (fnc_defs) / sizeof (Fnc_descriptor);
114

Per Cederqvist's avatar
Per Cederqvist committed
115
unsigned long service_statistics[sizeof (fnc_defs) / sizeof (Fnc_descriptor)];
Per Cederqvist's avatar
Per Cederqvist committed
116 117 118 119 120

BUGDECL;



Per Cederqvist's avatar
Per Cederqvist committed
121
static void
Per Cederqvist's avatar
Per Cederqvist committed
122 123 124
logout_client(Connection *cp)
{
    Connection *real_active_connection;
125
    int ret;
Per Cederqvist's avatar
Per Cederqvist committed
126 127 128

    if ( active_connection != NULL )
    {
David Byers's avatar
David Byers committed
129
	kom_log("BUGCHK: logout_client(%ld): connection %ld is active.\n",
Per Cederqvist's avatar
Per Cederqvist committed
130 131 132 133 134 135 136 137 138
	    cp->session_no, active_connection->session_no);
    }
    
    switch (cp->magic)
    {
    case CONN_MAGIC_ALLOC:
        break;

    case CONN_MAGIC_FREE:
David Byers's avatar
David Byers committed
139
	kom_log("LOGOUT_CLIENT: Trying to free freed Connection - ignored!\n");
Per Cederqvist's avatar
Per Cederqvist committed
140 141 142 143 144 145 146 147
	return;

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

    if ( cp->pers_no != 0 )
    {
148 149 150 151 152 153 154 155 156 157 158 159
	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;
Per Cederqvist's avatar
Per Cederqvist committed
160 161 162 163
	active_connection = cp;
	logout();
	active_connection = real_active_connection;
    }
164 165
    else
    {
166
#if 0
167
	/* FIXME (bug 93): send a new async here instead.  This causes the
168 169
	   elisp client to say that a secret (or unknown) person has
	   left the system.  */
170
        async_logout( 0, cp->session_no );
171
#endif
172
    }
Per Cederqvist's avatar
Per Cederqvist committed
173 174 175 176 177 178 179 180 181 182 183 184 185 186

    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");
    }

187 188
    ret = isc_destroy(kom_server_mcb, cp->isc_session);
    if (ret < 0)
David Byers's avatar
David Byers committed
189
	kom_log("logout_client(): isc_destroyed returned %d\n", ret);
190
    cp->isc_session = NULL;
Per Cederqvist's avatar
Per Cederqvist committed
191 192 193 194

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

Per Cederqvist's avatar
Per Cederqvist committed
195 196 197 198 199 200 201 202 203 204 205 206 207 208
/*
 * 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 )
209
	    restart_kom("logout_all_clients(): cant get session %ld.\n",
Per Cederqvist's avatar
Per Cederqvist committed
210 211 212 213 214 215
			sess);
	else
	    logout_client (conn);
    }

    if ( traverse_connections (0) != 0)
216
	restart_kom("logout_all_clients(): traverse_connections(0) == %ld.\n",
Per Cederqvist's avatar
Per Cederqvist committed
217 218 219 220
		    traverse_connections(0));
}

    
Per Cederqvist's avatar
Per Cederqvist committed
221 222 223 224 225 226 227 228
    

    
/*
 * 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
229 230
call_function(Connection *client,
	      union result_holder *res)
Per Cederqvist's avatar
Per Cederqvist committed
231 232 233 234 235
{
    Success	status=FAILURE;	/* OK if the call was successful. */

    if ( active_connection != NULL )
    {
236
	kom_log("call_function(%ld): active_connection = %ld\n",
Per Cederqvist's avatar
Per Cederqvist committed
237 238
	    client->session_no, active_connection->session_no);
    }
239 240 241

    if (client->function == illegal_fnc) 
    {
242
        err_stat = 0;
243 244 245 246
	kom_errno = KOM_NOT_IMPL;
	return FAILURE;
    }

Per Cederqvist's avatar
Per Cederqvist committed
247 248
    active_connection = client;

249
    service_statistics[client->function_index]++;
Per Cederqvist's avatar
Per Cederqvist committed
250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272

#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';
273 274
	    isc_puts("%%LysKOM unsupported protocol.\n", client->isc_session);
	    isc_flush(client->isc_session);
Per Cederqvist's avatar
Per Cederqvist committed
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
	    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. */
David Byers's avatar
David Byers committed
306 307 308
    sfree(client->misc_info_list.misc);
    client->misc_info_list.misc = 0;
    client->misc_info_list.no_of_misc = 0;
309
    s_clear(&client->aux_item.data);
310
    s_clear(&client->dummy_aux_item.data);
Per Cederqvist's avatar
Per Cederqvist committed
311 312 313 314
    sfree( client->c_local_text_no_p);
    client->c_local_text_no_p = NULL;
    client->parse_pos = 0;
    client->fnc_parse_pos = 0;
315
    client->array_parse_index = 0;
David Byers's avatar
David Byers committed
316
    client->array_parse_parsed_length = 0;
Per Cederqvist's avatar
Per Cederqvist committed
317 318 319
    client->array_parse_pos = 0;
    client->struct_parse_pos = 0;
    client->string_parse_pos = 0;
David Byers's avatar
David Byers committed
320 321 322
    client->hunt_parse_pos = 0;
    client->array_hunt_num = 0;
    client->array_hunt_depth = 0;
323 324 325
    sfree(client->num_list.data);
    client->num_list.data = NULL;
    client->num_list.length = 0;
326 327
    free_aux_item_list(&client->aux_item_list);
    client->info.highest_aux_no = 0;
Per Cederqvist's avatar
Per Cederqvist committed
328 329 330 331 332 333 334
}

/*
 * Send a reply to a call.
 */
static void
reply(Connection *client,
335 336
      Success status,
      union result_holder *result)
Per Cederqvist's avatar
Per Cederqvist committed
337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359
{
    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;
360
    union result_holder result;
Per Cederqvist's avatar
Per Cederqvist committed
361 362 363 364 365 366 367 368 369 370 371 372 373 374 375
        
    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);
	free_parsed(client);
	end_of_atomic(FALSE);
	break;

    case ISC_PROTOCOL_ERR:
	s_clear(&client->string0);
	free_parsed(client);
376 377
	isc_puts("%% LysKOM protocol error.\n", client->isc_session);
	isc_flush(client->isc_session);
Per Cederqvist's avatar
Per Cederqvist committed
378 379 380 381 382 383 384 385 386 387 388 389
	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:
390
	add_to_kill_list(client);
Per Cederqvist's avatar
Per Cederqvist committed
391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429
	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;
}


/*
430
 * parse data in client->unparsed if there
Per Cederqvist's avatar
Per Cederqvist committed
431 432 433
 * 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
434 435
static Bool
parse_forgotten(void)
Per Cederqvist's avatar
Per Cederqvist committed
436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454
{
    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;
	}
    }

455
    return flg ? FALSE : TRUE;
Per Cederqvist's avatar
Per Cederqvist committed
456 457 458 459 460
}


/* Return 1 if the named file exists, 0 otherwise */
static int
Per Cederqvist's avatar
Per Cederqvist committed
461
fexists(const char *filename)
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
{
    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;
    FILE *fp;

480
    if ((fp = fopen(param.statistic_name, "a")) == NULL)
Per Cederqvist's avatar
Per Cederqvist committed
481
    {
482 483
	kom_log("dump_statistics(): can't open file %s\n",
		param.statistic_name);
Per Cederqvist's avatar
Per Cederqvist committed
484 485 486 487 488 489
	return;
    }

    if (last_dump == NO_TIME)
    {
	fprintf(fp, "RESTART\n");
Per Cederqvist's avatar
Per Cederqvist committed
490
	last_dump = current_time;
Per Cederqvist's avatar
Per Cederqvist committed
491 492
    }
    
Per Cederqvist's avatar
Per Cederqvist committed
493 494
    fprintf(fp, "TIME: %s", ctime(&current_time));
    fprintf(fp, "SECONDS: %d\n", (int)ldifftime(current_time, last_dump));
Per Cederqvist's avatar
Per Cederqvist committed
495
    fprintf(fp, "STATISTICS:");
496 497 498 499 500

    /* 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++)
Per Cederqvist's avatar
Per Cederqvist committed
501
    {
502
	fprintf(fp, " %d:%lu", fnc_defs[i].function, service_statistics[i]);
Per Cederqvist's avatar
Per Cederqvist committed
503 504 505 506 507 508
	service_statistics[i]=0;
    }

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

Per Cederqvist's avatar
Per Cederqvist committed
509
    last_dump = current_time;
Per Cederqvist's avatar
Per Cederqvist committed
510 511
}

512 513 514 515 516 517 518 519 520
/* List of connections to kill. */

Session_no *kill_list = NULL;
int kill_list_size = 0;

/* Schedule this client for termination. */
void
add_to_kill_list(Connection *conn)
{
Per Cederqvist's avatar
Per Cederqvist committed
521 522 523
    int i;

    for (i = 0; i < kill_list_size; i++)
524
	if (kill_list[i] == conn->session_no)
Per Cederqvist's avatar
Per Cederqvist committed
525
	{
David Byers's avatar
David Byers committed
526
	    kom_log("add_to_kill_list(%ld): already present as %d of %d.\n",
Per Cederqvist's avatar
Per Cederqvist committed
527 528 529 530
		conn->session_no, i, kill_list_size);
	    return;
	}

531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546
    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;
}
Per Cederqvist's avatar
Per Cederqvist committed
547

548 549 550 551 552 553 554 555 556 557

void
dump_connections(void)
{
    Session_no s;
    Connection *conn;
    FILE *fp;

    if ((fp = fopen(param.connection_status_file_tmp, "w")) == NULL)
    {
558 559
	kom_log("dump_connections(): can't open file %s: %s\n",
		param.connection_status_file_tmp, strerror(errno));
560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578
	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);
    }

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

    if (rename(param.connection_status_file_tmp,
	       param.connection_status_file) < 0)
    {
579
	kom_log("dump_connections(): can't rename %s to %s: %s\n",
580
		param.connection_status_file_tmp,
581 582
		param.connection_status_file,
		strerror(errno));
583 584 585 586
    }
}


Per Cederqvist's avatar
Per Cederqvist committed
587 588 589 590 591 592 593
/*
 * check_kill_flg must NEVER be called inside an atomic call!
 */
static void
check_kill_flg(void)
{
    Connection *conn;
594
    Bool changed = FALSE;
Per Cederqvist's avatar
Per Cederqvist committed
595 596 597

    if ( active_connection != NULL )
    {
598
	restart_kom("check_kill_flg: active_connection == %ld",
Per Cederqvist's avatar
Per Cederqvist committed
599 600 601
		    active_connection->session_no);
    }

602
    while (kill_list_size > 0)
Per Cederqvist's avatar
Per Cederqvist committed
603
    {
604 605 606
	--kill_list_size;
	conn = get_conn_by_number (kill_list[kill_list_size]);
	if (conn == NULL)
Per Cederqvist's avatar
Per Cederqvist committed
607
	{
David Byers's avatar
David Byers committed
608
	    kom_log("check_kill_flg(): Connection %ld doesn't exist.\n",
609 610 611 612 613 614
		kill_list[kill_list_size]);
	}
	else
	{
	    logout_client (conn);
	    end_of_atomic (FALSE);
615
	    changed = TRUE;
Per Cederqvist's avatar
Per Cederqvist committed
616 617
	}
    }
618

619 620 621 622 623
    if (kill_list != NULL)
    {
	sfree (kill_list);
	kill_list = NULL;
    }
624 625 626

    if (changed == TRUE)
	dump_connections();
Per Cederqvist's avatar
Per Cederqvist committed
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

static char *
get_host_name(IscAddress *addr)
{
    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;
}


Per Cederqvist's avatar
Per Cederqvist committed
668
static void
Per Cederqvist's avatar
Per Cederqvist committed
669
login_request(IscEvent  *event)
Per Cederqvist's avatar
Per Cederqvist committed
670 671
{
    Connection  * cp;
672
    const char *realuser;
673
    char *hostname = NULL;
674
    char peername[256];
675 676 677
    char portbuf[1+2+3*sizeof(long)];
    size_t hostlen;
    size_t portlen;
Per Cederqvist's avatar
Per Cederqvist committed
678 679

    /* Supress logins if /etc/nologin exists */
David Byers's avatar
David Byers committed
680
    if (fexists(param.nologin_file))
Per Cederqvist's avatar
Per Cederqvist committed
681
    {
682
	isc_puts("%% No logins allowed.\n", event->session);
Per Cederqvist's avatar
Per Cederqvist committed
683
	isc_flush(event->session);
Per Cederqvist's avatar
Per Cederqvist committed
684
 	isc_destroy(kom_server_mcb, event->session);
Per Cederqvist's avatar
Per Cederqvist committed
685 686 687
	return;
    }

688
    hostname = get_host_name(event->session->info.tcp.raddr);
689
    if (hostname == NULL)
David Byers's avatar
David Byers committed
690
	kom_log("WNG: login_request(): unknown hostid.\n");
691

692 693 694
    /* Get the real user name, as returned by the Ident protocol (rfc 931). */
    realuser = get_real_username(event->session, hostname);
    if (realuser == NULL && param.authentication_level == 2)
Per Cederqvist's avatar
Per Cederqvist committed
695
    {
David Byers's avatar
David Byers committed
696
	kom_log("Connection from %s rejected - no IDENT available.\n", 
697
	     hostname);
Per Cederqvist's avatar
Per Cederqvist committed
698

699 700 701 702 703
	isc_puts("%% No IDENT server reachable at your site.\n",
		 event->session);
	isc_flush(event->session);
	isc_destroy(kom_server_mcb, event->session);
	return;
Per Cederqvist's avatar
Per Cederqvist committed
704
    }
705

706 707
    /* Create a Connection, and link the Connection and the
       isc_session together. */
708

709 710 711
    cp = new_client();
    cp->isc_session = event->session;
    event->session->udg = cp;
712

713 714
    if (hostname == NULL)
	s_crea_str(&cp->hostname, "unknown");
715
    else
716 717 718 719 720 721
	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));
722 723


724 725 726
    isc_getipnum(event->session->info.tcp.raddr, peername, sizeof(peername));
    hostlen = strlen(peername);
    if (hostlen >= sizeof(peername)-1)
727 728 729 730
    {
	kom_log("login_request(): truncated remote peer address %s.\n",
		peername);
    }
731 732 733
    sprintf(portbuf, " %d", isc_getportnum(event->session->info.tcp.raddr));
    portlen = strlen(portbuf);
    cp->peer = smalloc(hostlen + portlen + 1);
734
    strcpy(cp->peer, peername);
735
    strcpy(cp->peer + hostlen, portbuf);
736 737

    dump_connections();
Per Cederqvist's avatar
Per Cederqvist committed
738 739 740
}

static void
Per Cederqvist's avatar
Per Cederqvist committed
741
logout_request(IscEvent *event)
Per Cederqvist's avatar
Per Cederqvist committed
742 743 744
{
    Connection  * cp;
    
745
    cp = event->session->udg;
Per Cederqvist's avatar
Per Cederqvist committed
746
	      
747
    BUG(("\n[Client %lu from %s", cp->session_no,
748
	 get_host_name(event->session->info.tcp.raddr)));
749 750 751
    BUG((" is logging out]\n"));

    add_to_kill_list(cp);
Per Cederqvist's avatar
Per Cederqvist committed
752 753 754 755
}


static void
Per Cederqvist's avatar
Per Cederqvist committed
756
message_request(IscEvent *event)
Per Cederqvist's avatar
Per Cederqvist committed
757 758 759 760
{
    Connection *cp;
    String      tmp_str;

761 762 763 764 765 766 767
    cp = event->session->udg;
    VBUG(("\n[Message from client %lu]\n", cp->session_no));

    /* Pass the message on to the parser */
    tmp_str.string = (unsigned char *)event->msg->buffer;
    tmp_str.len    = event->msg->length;
    parse_message(cp, tmp_str);
Per Cederqvist's avatar
Per Cederqvist committed
768 769 770 771 772
}

void
toploop(void)
{
David Byers's avatar
David Byers committed
773
    time_t      last_time;
774
    IscEvent  * event;
Per Cederqvist's avatar
Per Cederqvist committed
775 776 777 778
    Bool	pending_input = TRUE; /* Should be TRUE whenever there
				         is or might be pending input
					 from any client in the unparsed
					 buffer. */
779 780 781
    long	timeout = 0;        /* In milliseconds. Start with a
				       small value since we should
				       start garbing right away. */
Per Cederqvist's avatar
Per Cederqvist committed
782 783
    while ( !go_and_die )
    {
784
        if (do_statistics)
Per Cederqvist's avatar
Per Cederqvist committed
785 786
	{
	    dump_statistics();
787
	    do_statistics = 0;
Per Cederqvist's avatar
Per Cederqvist committed
788 789
	}

790 791 792 793 794
        if (reread_param)
        {
            free_aux_item_definitions();
            initialize_aux_items(param.aux_def_file);
            reread_param = FALSE;
795
            kom_log("Signal WINCH received. aux definitions reloaded.\n");
796 797
        }

798
	intr_syscalls_on_intr();
Per Cederqvist's avatar
Per Cederqvist committed
799 800
	event = isc_getnextevent(kom_server_mcb,
				 pending_input ? 0 : timeout );
801
	restart_syscalls_on_intr();
Per Cederqvist's avatar
Per Cederqvist committed
802

David Byers's avatar
David Byers committed
803
        last_time = current_time;
Per Cederqvist's avatar
Per Cederqvist committed
804
	current_time = time(NULL);
David Byers's avatar
David Byers committed
805 806
        if (current_time < last_time)
        {
807
            kom_log("WARNING: Time is moving in the wrong direction\n");
808
            /* FIXME (bug 62): Should we take more decisive action here? */
David Byers's avatar
David Byers committed
809 810
        }

Per Cederqvist's avatar
Per Cederqvist committed
811
	timeout = 0;
Per Cederqvist's avatar
Per Cederqvist committed
812 813 814 815

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

816
#ifndef USING_RLIMIT_NOFILE
817 818 819
	if (event->event == ISC_EVENT_LOGIN
	    && event->session->fd >= fd_ceiling)
	{
820
	    event->event = ISC_EVENT_LOGIN_UNRELOCATED;
821
	}
822 823
#endif

Per Cederqvist's avatar
Per Cederqvist committed
824 825 826 827 828
	switch ( event->event )
	{
	case ISC_EVENT_ERROR:
	    if (errno != EINTR)
	    {
David Byers's avatar
David Byers committed
829
		kom_log("toploop: ISC_EVENT_ERROR (error = '%s'):\n   '%s'\n",
Per Cederqvist's avatar
Per Cederqvist committed
830 831 832 833 834 835 836
		    strerror(errno), event->msg ? event->msg->buffer
		    : "(unknown)");
	    }
	    break;
	    
	case ISC_EVENT_TIMEOUT:
	    BUG((">"));
837
#ifndef NDEBUG
838 839
	    if (buglevel > 0)
		fflush(stdout);
Per Cederqvist's avatar
Per Cederqvist committed
840 841 842 843
#endif
	    if ( pending_input == FALSE )
		timeout = end_of_atomic(TRUE); /* Idle. Do some cleaning up. */
	    else
844
		pending_input = (parse_forgotten() ? FALSE : TRUE);
Per Cederqvist's avatar
Per Cederqvist committed
845 846 847 848 849 850 851 852
	    	    
	    break;
	    
	case ISC_EVENT_LOGIN:
	    pending_input = TRUE;
	    login_request(event);
	    break;

853 854 855
	case ISC_EVENT_LOGIN_UNRELOCATED:
	    pending_input = TRUE;
	    BUG(("Connection attempt rejected.\n"));
856
	    isc_puts("%% No connections left.\n", event->session);
857 858 859 860 861 862
	    isc_flush(event->session);
	    isc_destroy(kom_server_mcb, event->session);

	    async_rejected_connection();
	    break;

Per Cederqvist's avatar
Per Cederqvist committed
863 864 865 866 867 868 869 870 871 872 873 874
	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;
David Byers's avatar
David Byers committed
875
	    kom_log("ERROR: toploop(): Unknown ISC_EVENT\n");
Per Cederqvist's avatar
Per Cederqvist committed
876 877 878 879 880 881 882 883
	    break;
	}

        isc_dispose(event);

	check_kill_flg();
    }
}