connections.c 23.6 KB
Newer Older
Linus Tolke Y's avatar
Linus Tolke Y committed
1
/*
2
 * $Id: connections.c,v 0.102 2003/07/23 08:23:05 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>
46
#include "timewrap.h"
47
#include <sys/socket.h>
48
#include <signal.h>
49
#include <assert.h>
Per Cederqvist's avatar
Per Cederqvist committed
50

51 52 53
#include "oop.h"

#include "unused.h"
54
#include "ldifftime.h"
Per Cederqvist's avatar
Per Cederqvist committed
55
#include "misc-types.h"
56
#include "s-string.h"
Per Cederqvist's avatar
Per Cederqvist committed
57
#include "kom-types.h"
58
#include "kom-memory.h"
Per Cederqvist's avatar
Per Cederqvist committed
59
#include "debug.h"
60
#include "isc-interface.h"
Per Cederqvist's avatar
Per Cederqvist committed
61
#include "com.h"
62
#include "async.h"
Per Cederqvist's avatar
Per Cederqvist committed
63
#include "connections.h"
Per Cederqvist's avatar
Per Cederqvist committed
64
#include "internal-connections.h"
Per Cederqvist's avatar
Per Cederqvist committed
65
#include "prot-a-parse-arg.h"
Per Cederqvist's avatar
Per Cederqvist committed
66 67 68 69 70
#include "log.h"
#include "lyskomd.h"
#include "services.h"
#include "isc-parse.h"
#include "prot-a.h"
71
#include "prot-a-parse.h"
Per Cederqvist's avatar
Per Cederqvist committed
72 73 74 75
#include "server/smalloc.h"
#include "end-of-atomic.h"
#include "send-async.h"
#include "cache.h"
76
#include "rfc931.h"
77
#include "param.h"
David Byers's avatar
David Byers committed
78
#include "kom-config.h"
79
#include "kom-errno.h"
Per Cederqvist's avatar
Per Cederqvist committed
80
#include "sigflags.h"
Per Cederqvist's avatar
Per Cederqvist committed
81
#include "server-time.h"
82
#include "aux-items.h"
83
#include "eintr.h"
84
#include "text-garb.h"
85
#include "timeval-util.h"
86
#include "stats.h"
Per Cederqvist's avatar
Per Cederqvist committed
87

88 89
oop_source_sys * kom_server_oop_src = NULL;
struct isc_mcb * 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
Bool go_and_die = FALSE;
Per Cederqvist's avatar
Per Cederqvist committed
99 100

/*
101 102 103 104 105 106 107 108 109
 * 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.
Per Cederqvist's avatar
Per Cederqvist committed
110
 */
111 112
static Bool work_done = FALSE;
static Bool is_idle = FALSE;
Per Cederqvist's avatar
Per Cederqvist committed
113 114 115 116 117 118 119 120

jmp_buf 	 parse_env;


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

121
const int num_fnc_defs = sizeof (fnc_defs) / sizeof (Fnc_descriptor);
122

Per Cederqvist's avatar
Per Cederqvist committed
123
unsigned long service_statistics[sizeof (fnc_defs) / sizeof (Fnc_descriptor)];
Per Cederqvist's avatar
Per Cederqvist committed
124 125 126

BUGDECL;

127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148
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;
149 150
    update_stat(STAT_RUN_QUEUE, 1);
    update_stat(STAT_RUN_QUEUE_ENTER, 1);
151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166
}

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
167
	queue_first = c->queue_next;
Per Cederqvist's avatar
Per Cederqvist committed
168

169 170
    c->queue_prev = NULL;
    c->queue_next = NULL;
171 172
    update_stat(STAT_RUN_QUEUE, -1);
    update_stat(STAT_RUN_QUEUE_LEAVE, 1);
173 174
}

Per Cederqvist's avatar
Per Cederqvist committed
175
void
176 177
set_time(void)
{
178 179
    struct timeval last_time;
    static int limiter = 0;
180 181

    last_time = current_time;
182 183 184 185 186 187 188 189 190 191 192
    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))
193 194 195 196 197
    {
	kom_log("WARNING: Time is moving in the wrong direction.\n");
	/* FIXME (bug 62): Should we take more decisive action here? */
    }
}
Per Cederqvist's avatar
Per Cederqvist committed
198

Per Cederqvist's avatar
Per Cederqvist committed
199
static void
Per Cederqvist's avatar
Per Cederqvist committed
200 201 202
logout_client(Connection *cp)
{
    Connection *real_active_connection;
203
    int ret;
Per Cederqvist's avatar
Per Cederqvist committed
204 205 206

    if ( active_connection != NULL )
    {
David Byers's avatar
David Byers committed
207
	kom_log("BUGCHK: logout_client(%ld): connection %ld is active.\n",
Per Cederqvist's avatar
Per Cederqvist committed
208 209 210 211 212
	    cp->session_no, active_connection->session_no);
    }
    
    if ( cp->pers_no != 0 )
    {
213 214 215 216 217 218 219 220 221 222 223 224
	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
225 226 227 228
	active_connection = cp;
	logout();
	active_connection = real_active_connection;
    }
229 230
    else
    {
231
#if 0
232
	/* FIXME (bug 908): send a new async here instead.  This causes the
233 234
	   elisp client to say that a secret (or unknown) person has
	   left the system.  */
235
        async_logout( 0, cp->session_no );
236
#endif
237
    }
Per Cederqvist's avatar
Per Cederqvist committed
238 239 240 241 242 243 244 245 246 247 248 249 250 251

    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");
    }

252 253
    ret = isc_destroy(kom_server_mcb, cp->isc_session);
    if (ret < 0)
David Byers's avatar
David Byers committed
254
	kom_log("logout_client(): isc_destroyed returned %d\n", ret);
255
    cp->isc_session = NULL;
256 257
    if (cp->on_queue)
	queue_remove(cp);
Per Cederqvist's avatar
Per Cederqvist committed
258 259 260 261

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

Per Cederqvist's avatar
Per Cederqvist committed
262 263 264 265 266 267 268 269 270 271 272 273 274 275
/*
 * 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 )
276
	    restart_kom("logout_all_clients(): cant get session %ld.\n",
Per Cederqvist's avatar
Per Cederqvist committed
277 278 279 280 281 282
			sess);
	else
	    logout_client (conn);
    }

    if ( traverse_connections (0) != 0)
283
	restart_kom("logout_all_clients(): traverse_connections(0) == %ld.\n",
Per Cederqvist's avatar
Per Cederqvist committed
284 285 286 287
		    traverse_connections(0));
}

    
Per Cederqvist's avatar
Per Cederqvist committed
288 289 290 291 292 293 294 295
    

    
/*
 * 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
296 297
call_function(Connection *client,
	      union result_holder *res)
Per Cederqvist's avatar
Per Cederqvist committed
298 299 300 301 302
{
    Success	status=FAILURE;	/* OK if the call was successful. */

    if ( active_connection != NULL )
    {
303
	kom_log("call_function(%ld): active_connection = %ld\n",
Per Cederqvist's avatar
Per Cederqvist committed
304 305
	    client->session_no, active_connection->session_no);
    }
306 307 308

    if (client->function == illegal_fnc) 
    {
309
        err_stat = 0;
310 311 312 313
	kom_errno = KOM_NOT_IMPL;
	return FAILURE;
    }

Per Cederqvist's avatar
Per Cederqvist committed
314 315
    active_connection = client;

316
    service_statistics[client->function_index]++;
Per Cederqvist's avatar
Per Cederqvist committed
317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339

#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';
340 341
	    isc_puts("%%LysKOM unsupported protocol.\n", client->isc_session);
	    isc_flush(client->isc_session);
Per Cederqvist's avatar
Per Cederqvist committed
342
	    BUG(("%%%%Unsupported protocol.\n"));
343
	    longjmp(parse_env, KOM_LOGOUT);
Per Cederqvist's avatar
Per Cederqvist committed
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
	}
    }

    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
373 374 375
    sfree(client->misc_info_list.misc);
    client->misc_info_list.misc = 0;
    client->misc_info_list.no_of_misc = 0;
376
    s_clear(&client->aux_item.data);
377
    s_clear(&client->dummy_aux_item.data);
Per Cederqvist's avatar
Per Cederqvist committed
378 379
    sfree( client->c_local_text_no_p);
    client->c_local_text_no_p = NULL;
380 381 382
    sfree(client->read_range_list.ranges);
    client->read_range_list.ranges = NULL;
    client->read_range_list.length = 0;
Per Cederqvist's avatar
Per Cederqvist committed
383 384
    client->parse_pos = 0;
    client->fnc_parse_pos = 0;
385
    client->array_parse_index = 0;
David Byers's avatar
David Byers committed
386
    client->array_parse_parsed_length = 0;
Per Cederqvist's avatar
Per Cederqvist committed
387 388 389
    client->array_parse_pos = 0;
    client->struct_parse_pos = 0;
    client->string_parse_pos = 0;
David Byers's avatar
David Byers committed
390 391 392
    client->hunt_parse_pos = 0;
    client->array_hunt_num = 0;
    client->array_hunt_depth = 0;
393 394 395
    sfree(client->num_list.data);
    client->num_list.data = NULL;
    client->num_list.length = 0;
396 397
    free_aux_item_list(&client->aux_item_list);
    client->info.highest_aux_no = 0;
Per Cederqvist's avatar
Per Cederqvist committed
398 399 400 401 402 403 404
}

/*
 * Send a reply to a call.
 */
static void
reply(Connection *client,
405 406
      Success status,
      union result_holder *result)
Per Cederqvist's avatar
Per Cederqvist committed
407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422
{
    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.
423 424
 * If more data is needed set client->more_to_parse to FALSE.  Returns
 * TRUE if anything was (or might have been) written to the client.
Per Cederqvist's avatar
Per Cederqvist committed
425
 */
426
static Bool
Per Cederqvist's avatar
Per Cederqvist committed
427 428 429
parse_unparsed(Connection *client)
{
    Success       status;
430
    union result_holder result;
Per Cederqvist's avatar
Per Cederqvist committed
431 432 433 434 435 436 437 438
        
    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);
439
	client->penalty += param.penalty_per_call;
Per Cederqvist's avatar
Per Cederqvist committed
440
	free_parsed(client);
441
	update_stat(STAT_PROCESSED_CALLS, 1);
442
	end_of_atomic();
443
	return TRUE;
Per Cederqvist's avatar
Per Cederqvist committed
444

445
    case KOM_PROTOCOL_ERR:
Per Cederqvist's avatar
Per Cederqvist committed
446 447
	s_clear(&client->string0);
	free_parsed(client);
448
	isc_puts("%% LysKOM protocol error.\n", client->isc_session);
Per Cederqvist's avatar
Per Cederqvist committed
449
	BUG(("%%%% Protocol error.\n"));
450
	client->penalty += param.max_penalty;
Per Cederqvist's avatar
Per Cederqvist committed
451 452 453
	s_clear(&client->unparsed);
	client->first_to_parse = 0;
	client->more_to_parse = FALSE;
454
	end_of_atomic();
455
	return TRUE;
Per Cederqvist's avatar
Per Cederqvist committed
456

457
    case KOM_MSG_INCOMPLETE:
Per Cederqvist's avatar
Per Cederqvist committed
458
	client->more_to_parse = FALSE;
459
	return FALSE;
Per Cederqvist's avatar
Per Cederqvist committed
460

461
    case KOM_LOGOUT:
462
	add_to_kill_list(client);
463
	client->more_to_parse = FALSE;
464 465 466
	return TRUE;
    default:
	restart_kom("Bad longjmp return value.\n");
Per Cederqvist's avatar
Per Cederqvist committed
467
    }
468
    /*NOTREACHED*/
Per Cederqvist's avatar
Per Cederqvist committed
469 470 471 472 473
}


/* Return 1 if the named file exists, 0 otherwise */
static int
Per Cederqvist's avatar
Per Cederqvist committed
474
fexists(const char *filename)
Per Cederqvist's avatar
Per Cederqvist committed
475 476 477 478 479 480 481 482 483 484 485 486 487 488
{
    struct stat buf;
    int code;
  
    code = !stat(filename, &buf);
    errno = 0;

    return code;
}


void
dump_statistics(void)
{
489
    static struct timeval last_dump = {0, 0};
Per Cederqvist's avatar
Per Cederqvist committed
490 491 492
    int i;
    FILE *fp;

493
    if ((fp = i_fopen(param.statistic_name, "a")) == NULL)
Per Cederqvist's avatar
Per Cederqvist committed
494
    {
495 496
	kom_log("dump_statistics(): can't open file %s\n",
		param.statistic_name);
Per Cederqvist's avatar
Per Cederqvist committed
497 498 499
	return;
    }

500
    if (timeval_zero(last_dump))
Per Cederqvist's avatar
Per Cederqvist committed
501 502
    {
	fprintf(fp, "RESTART\n");
Per Cederqvist's avatar
Per Cederqvist committed
503
	last_dump = current_time;
Per Cederqvist's avatar
Per Cederqvist committed
504 505
    }
    
506 507
    fprintf(fp, "TIME: %s", ctime(&current_time.tv_sec));
    fprintf(fp, "SECONDS: %ld\n", timeval_diff_sec(current_time, last_dump));
Per Cederqvist's avatar
Per Cederqvist committed
508
    fprintf(fp, "STATISTICS:");
509 510 511 512 513

    /* 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
514
    {
515
	fprintf(fp, " %d:%lu", fnc_defs[i].function, service_statistics[i]);
Per Cederqvist's avatar
Per Cederqvist committed
516 517 518 519
	service_statistics[i]=0;
    }

    fprintf(fp, "\n");
520
    i_fclose(fp);
Per Cederqvist's avatar
Per Cederqvist committed
521

Per Cederqvist's avatar
Per Cederqvist committed
522
    last_dump = current_time;
Per Cederqvist's avatar
Per Cederqvist committed
523 524
}

525 526
/* List of connections to kill. */

Per Cederqvist's avatar
Per Cederqvist committed
527 528
static Session_no *kill_list = NULL;
static int kill_list_size = 0;
529
static int kill_pending = 0;
530 531 532 533 534

/* Schedule this client for termination. */
void
add_to_kill_list(Connection *conn)
{
535
    oop_source *source;
Per Cederqvist's avatar
Per Cederqvist committed
536 537 538
    int i;

    for (i = 0; i < kill_list_size; i++)
539
	if (kill_list[i] == conn->session_no)
Per Cederqvist's avatar
Per Cederqvist committed
540 541
	    return;

542 543 544 545 546 547 548 549 550 551 552 553 554 555 556
    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;
557 558 559 560 561 562 563

    if (!kill_pending)
    {
	source = conn->isc_session->master->event_source;
	source->on_time(source, OOP_TIME_NOW, check_kill_flg, NULL);
	kill_pending = 1;
    }
564
}
Per Cederqvist's avatar
Per Cederqvist committed
565

566 567 568 569 570 571 572 573

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

574
    if ((fp = i_fopen(param.connection_status_file_tmp, "w")) == NULL)
575
    {
576 577
	kom_log("dump_connections(): can't open file %s: %s\n",
		param.connection_status_file_tmp, strerror(errno));
578 579 580 581 582 583 584 585 586 587
	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);
    }

588 589 590 591 592 593
    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");

594
    if (i_fclose(fp) < 0)
595 596 597 598 599
    {
	kom_log("dump_connections(): fclose failed: %s (ignored)\n",
		strerror(errno));
    }

600
    errno = 0;
601 602
    if (i_rename(param.connection_status_file_tmp,
		 param.connection_status_file) < 0)
603
    {
604
	kom_log("dump_connections(): can't rename %s to %s: %s\n",
605
		param.connection_status_file_tmp,
606 607
		param.connection_status_file,
		strerror(errno));
608 609 610 611
    }
}


Per Cederqvist's avatar
Per Cederqvist committed
612 613 614
/*
 * check_kill_flg must NEVER be called inside an atomic call!
 */
615 616 617 618
static void *
check_kill_flg(oop_source *UNUSED(source),
	       struct timeval UNUSED(tv),
	       void *UNUSED(user))
Per Cederqvist's avatar
Per Cederqvist committed
619 620
{
    Connection *conn;
621
    Bool changed = FALSE;
Per Cederqvist's avatar
Per Cederqvist committed
622

623 624
    kill_pending = 0;

Per Cederqvist's avatar
Per Cederqvist committed
625 626
    if ( active_connection != NULL )
    {
627
	restart_kom("check_kill_flg: active_connection == %ld",
Per Cederqvist's avatar
Per Cederqvist committed
628 629 630
		    active_connection->session_no);
    }

631
    while (kill_list_size > 0)
Per Cederqvist's avatar
Per Cederqvist committed
632
    {
633 634 635
	--kill_list_size;
	conn = get_conn_by_number (kill_list[kill_list_size]);
	if (conn == NULL)
Per Cederqvist's avatar
Per Cederqvist committed
636
	{
David Byers's avatar
David Byers committed
637
	    kom_log("check_kill_flg(): Connection %ld doesn't exist.\n",
638 639 640 641
		kill_list[kill_list_size]);
	}
	else
	{
642 643
	    logout_client(conn);
	    end_of_atomic();
644
	    changed = TRUE;
Per Cederqvist's avatar
Per Cederqvist committed
645 646
	}
    }
647

648 649 650 651 652
    if (kill_list != NULL)
    {
	sfree (kill_list);
	kill_list = NULL;
    }
653 654 655

    if (changed == TRUE)
	dump_connections();
656 657

    return OOP_CONTINUE;
Per Cederqvist's avatar
Per Cederqvist committed
658 659
}

660 661

static char *
662
get_host_name(union isc_address *addr)
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
{
    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;
}

698 699 700 701 702 703 704
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;
705 706 707
    if (saved_errno != ECONNRESET)
	kom_log("Failed to write to client %lu from %s: %s\n",
		cp->session_no, cp->peer, strerror(saved_errno));
708 709 710 711
    add_to_kill_list(cp);
}


712

Per Cederqvist's avatar
Per Cederqvist committed
713
static void
714
login_request(struct isc_scb *session)
Per Cederqvist's avatar
Per Cederqvist committed
715 716
{
    Connection  * cp;
717
    const char *realuser;
718
    char *hostname = NULL;
719
    char peername[256];
720 721 722
    char portbuf[1+2+3*sizeof(long)];
    size_t hostlen;
    size_t portlen;
Per Cederqvist's avatar
Per Cederqvist committed
723 724

    /* Supress logins if /etc/nologin exists */
David Byers's avatar
David Byers committed
725
    if (fexists(param.nologin_file))
Per Cederqvist's avatar
Per Cederqvist committed
726
    {
727 728 729
	isc_puts("%% No logins allowed.\n", session);
	isc_flush(session);
 	isc_destroy(kom_server_mcb, session);
Per Cederqvist's avatar
Per Cederqvist committed
730 731 732
	return;
    }

733
    hostname = get_host_name(session->raddr);
734
    if (hostname == NULL)
David Byers's avatar
David Byers committed
735
	kom_log("WNG: login_request(): unknown hostid.\n");
736

737
    /* Get the real user name, as returned by the Ident protocol (rfc 931). */
738
    realuser = get_real_username(session, hostname);
739
    if (realuser == NULL && param.authentication_level == 2)
Per Cederqvist's avatar
Per Cederqvist committed
740
    {
David Byers's avatar
David Byers committed
741
	kom_log("Connection from %s rejected - no IDENT available.\n", 
742
	     hostname);
Per Cederqvist's avatar
Per Cederqvist committed
743

744
	isc_puts("%% No IDENT server reachable at your site.\n",
745 746 747
		 session);
	isc_flush(session);
	isc_destroy(kom_server_mcb, session);
748
	return;
Per Cederqvist's avatar
Per Cederqvist committed
749
    }
750

751 752
    /* Create a Connection, and link the Connection and the
       isc_session together. */
753

754
    cp = new_client();
755 756
    cp->isc_session = session;
    session->udg = cp;
757

758 759
    if (hostname == NULL)
	s_crea_str(&cp->hostname, "unknown");
760
    else
761 762 763 764 765 766
	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));
767 768


769
    isc_getipnum(session->raddr, peername, sizeof(peername));
770 771
    hostlen = strlen(peername);
    if (hostlen >= sizeof(peername)-1)
772 773 774 775
    {
	kom_log("login_request(): truncated remote peer address %s.\n",
		peername);
    }
776
    sprintf(portbuf, " %d", isc_getportnum(session->raddr));
777 778
    portlen = strlen(portbuf);
    cp->peer = smalloc(hostlen + portlen + 1);
779
    strcpy(cp->peer, peername);
780
    strcpy(cp->peer + hostlen, portbuf);
781 782

    dump_connections();
783 784

    isc_set_read_callback(session, data_available_callback, write_err_cb, cp);
Per Cederqvist's avatar
Per Cederqvist committed
785 786 787
}

static void
788
adjust_penalty(Connection *conn)
Per Cederqvist's avatar
Per Cederqvist committed
789
{
790 791 792 793 794 795 796 797
    while (penalty_generation - conn->penalty_generation > 0)
    {
	conn->penalty /= 2;
	if (conn->penalty == 0)
	    conn->penalty_generation = penalty_generation;
	else
	    conn->penalty_generation++;
    }
Per Cederqvist's avatar
Per Cederqvist committed
798 799 800 801
}


static void
802
read_from_connection(Connection *conn)
Per Cederqvist's avatar
Per Cederqvist committed
803
{
804
    Bool would_block = FALSE;
805
    Bool need_flush = FALSE;
Per Cederqvist's avatar
Per Cederqvist committed
806

807 808 809 810 811 812
    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)
813
	    need_flush |= parse_unparsed(conn);
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

	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;
	}
    }
847

848 849 850
    if (need_flush)
	isc_flush(conn->isc_session);

851 852 853 854 855 856 857 858 859 860
    /* 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);
    }
Per Cederqvist's avatar
Per Cederqvist committed
861 862
}

863

Per Cederqvist's avatar
Per Cederqvist committed
864
void
865
setup_timer(struct timeval *tv,
866
	    struct timeval interval)
Per Cederqvist's avatar
Per Cederqvist committed
867
{
868 869 870 871 872
    static int errcnt = 0;

    if (gettimeofday(tv, NULL) < 0)
    {
	if (errcnt < 20)
Per Cederqvist's avatar
Per Cederqvist committed
873
	{
874 875 876 877 878
	    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");
Per Cederqvist's avatar
Per Cederqvist committed
879
	}
880 881 882 883 884
	
	*tv = OOP_TIME_NOW;
    }
    else
    {
885 886
	tv->tv_sec += interval.tv_sec;
	tv->tv_usec += interval.tv_usec;
887
	if (tv->tv_usec > 1000000)
888
	{
889
	    tv->tv_usec -= 1000000;
890
	    tv->tv_sec++;
891
	}
892
    }
893 894
    assert(tv->tv_usec >= 0);
    assert(tv->tv_usec < 1000000);
895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921
}

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;
922

923
	for (next = queue_first; next != NULL && !go_and_die; )
Per Cederqvist's avatar
Per Cederqvist committed
924
	{
925 926 927 928
	    c = next;
	    next = next->queue_next;
	    adjust_penalty(c);
	    if (c->penalty < param.low_penalty)
Per Cederqvist's avatar
Per Cederqvist committed
929
	    {
930 931 932
		queue_remove(c);
		isc_enable(c->isc_session);
		read_from_connection(c);
Per Cederqvist's avatar
Per Cederqvist committed
933
	    }
934 935 936 937 938 939
	}
    }

    if (!is_idle)
	enable_idle_check();

940 941
    /* Check if a client issued a shutdown command.  */
    return go_and_die ? OOP_HALT : OOP_CONTINUE;
942 943 944
}

static void *
Per Cederqvist's avatar
Per Cederqvist committed
945
saver_callback(oop_source *source,
946 947 948
	       struct timeval UNUSED(tv),
	       void *user)
{
949
    struct timeval timeout;
950
    struct timeval *next_timer = user;
951

952 953
    timeout = end_of_atomic();
    setup_timer(next_timer, timeout);
Per Cederqvist's avatar
Per Cederqvist committed
954

955 956 957
    source->on_time(source, *next_timer, saver_callback, user);
    return OOP_CONTINUE;
}
Per Cederqvist's avatar
Per Cederqvist committed
958 959


960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001
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);
Per Cederqvist's avatar
Per Cederqvist committed
1002

1003
	async_rejected_connection();
Per Cederqvist's avatar
Per Cederqvist committed
1004
    }
1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020
    else
	login_request(new_session);

    return OOP_CONTINUE;
}


void
toploop(void)
{
    struct timeval saver_timer;

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

    /* Start the garb right away. */
Per Cederqvist's avatar
Per Cederqvist committed
1021
    start_garb_thread(source);
1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049

    /* 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)
    {