connections.c 24.6 KB
Newer Older
Linus Tolke's avatar
Linus Tolke committed
1
/*
2
 * $Id: connections.c,v 0.108 2003/07/31 17:54:24 ceder Exp $
Per Cederqvist's avatar
Per Cederqvist committed
3
 * Copyright (C) 1991-2002  Lysator Academic Computer Association.
Linus Tolke's avatar
Linus Tolke 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
    update_stat(STAT_RUN_QUEUE, 1);
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
}

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
166
	queue_first = c->queue_next;
Per Cederqvist's avatar
Per Cederqvist committed
167

168
169
    c->queue_prev = NULL;
    c->queue_next = NULL;
170
    update_stat(STAT_RUN_QUEUE, -1);
171
172
}

Per Cederqvist's avatar
Per Cederqvist committed
173
void
174
175
set_time(void)
{
176
177
    struct timeval last_time;
    static int limiter = 0;
178
179

    last_time = current_time;
180
181
182
183
184
185
186
187
188
189
190
    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))
191
192
193
194
195
    {
	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
196

Per Cederqvist's avatar
Per Cederqvist committed
197
static void
Per Cederqvist's avatar
Per Cederqvist committed
198
199
200
logout_client(Connection *cp)
{
    Connection *real_active_connection;
201
    int ret;
Per Cederqvist's avatar
Per Cederqvist committed
202
203
204

    if ( active_connection != NULL )
    {
David Byers's avatar
David Byers committed
205
	kom_log("BUGCHK: logout_client(%ld): connection %ld is active.\n",
Per Cederqvist's avatar
Per Cederqvist committed
206
207
208
209
210
	    cp->session_no, active_connection->session_no);
    }
    
    if ( cp->pers_no != 0 )
    {
211
212
213
214
215
216
217
218
219
220
221
222
	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
223
224
225
226
	active_connection = cp;
	logout();
	active_connection = real_active_connection;
    }
227
228
    else
    {
229
#if 0
230
	/* FIXME (bug 908): send a new async here instead.  This causes the
231
232
	   elisp client to say that a secret (or unknown) person has
	   left the system.  */
233
        async_logout( 0, cp->session_no );
234
#endif
235
    }
Per Cederqvist's avatar
Per Cederqvist committed
236
237
238
239
240
241
242
243
244
245
246
247
248
249

    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");
    }

250
251
    ret = isc_destroy(kom_server_mcb, cp->isc_session);
    if (ret < 0)
David Byers's avatar
David Byers committed
252
	kom_log("logout_client(): isc_destroyed returned %d\n", ret);
253
    cp->isc_session = NULL;
254
255
    if (cp->on_queue)
	queue_remove(cp);
Per Cederqvist's avatar
Per Cederqvist committed
256
257

    kill_client(cp);		/* Free the Connection */
258
    update_stat(STAT_CLIENTS, -1);
Per Cederqvist's avatar
Per Cederqvist committed
259
260
}

Per Cederqvist's avatar
Per Cederqvist committed
261
262
263
264
265
266
267
268
269
270
271
272
273
274
/*
 * 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 )
275
	    restart_kom("logout_all_clients(): cant get session %ld.\n",
Per Cederqvist's avatar
Per Cederqvist committed
276
277
278
279
280
281
			sess);
	else
	    logout_client (conn);
    }

    if ( traverse_connections (0) != 0)
282
	restart_kom("logout_all_clients(): traverse_connections(0) == %ld.\n",
Per Cederqvist's avatar
Per Cederqvist committed
283
284
285
286
		    traverse_connections(0));
}

    
Per Cederqvist's avatar
Per Cederqvist committed
287
288
289
290
291
292
293
294
    

    
/*
 * 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
295
296
call_function(Connection *client,
	      union result_holder *res)
Per Cederqvist's avatar
Per Cederqvist committed
297
298
299
300
301
{
    Success	status=FAILURE;	/* OK if the call was successful. */

    if ( active_connection != NULL )
    {
302
	kom_log("call_function(%ld): active_connection = %ld\n",
Per Cederqvist's avatar
Per Cederqvist committed
303
304
	    client->session_no, active_connection->session_no);
    }
305
306
307

    if (client->function == illegal_fnc) 
    {
308
        err_stat = 0;
309
310
311
312
	kom_errno = KOM_NOT_IMPL;
	return FAILURE;
    }

Per Cederqvist's avatar
Per Cederqvist committed
313
314
    active_connection = client;

315
    service_statistics[client->function_index]++;
Per Cederqvist's avatar
Per Cederqvist committed
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338

#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';
339
340
	    isc_puts("%%LysKOM unsupported protocol.\n", client->isc_session);
	    isc_flush(client->isc_session);
Per Cederqvist's avatar
Per Cederqvist committed
341
	    BUG(("%%%%Unsupported protocol.\n"));
342
	    longjmp(parse_env, KOM_LOGOUT);
Per Cederqvist's avatar
Per Cederqvist committed
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
	}
    }

    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
372
373
374
    sfree(client->misc_info_list.misc);
    client->misc_info_list.misc = 0;
    client->misc_info_list.no_of_misc = 0;
375
    s_clear(&client->aux_item.data);
376
    s_clear(&client->dummy_aux_item.data);
Per Cederqvist's avatar
Per Cederqvist committed
377
378
    sfree( client->c_local_text_no_p);
    client->c_local_text_no_p = NULL;
379
380
381
    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
382
383
    client->parse_pos = 0;
    client->fnc_parse_pos = 0;
384
    client->array_parse_index = 0;
David Byers's avatar
David Byers committed
385
    client->array_parse_parsed_length = 0;
Per Cederqvist's avatar
Per Cederqvist committed
386
387
388
    client->array_parse_pos = 0;
    client->struct_parse_pos = 0;
    client->string_parse_pos = 0;
David Byers's avatar
David Byers committed
389
390
391
    client->hunt_parse_pos = 0;
    client->array_hunt_num = 0;
    client->array_hunt_depth = 0;
392
393
394
    sfree(client->num_list.data);
    client->num_list.data = NULL;
    client->num_list.length = 0;
395
396
    free_aux_item_list(&client->aux_item_list);
    client->info.highest_aux_no = 0;
Per Cederqvist's avatar
Per Cederqvist committed
397
398
399
400
401
402
403
}

/*
 * Send a reply to a call.
 */
static void
reply(Connection *client,
404
405
      Success status,
      union result_holder *result)
Per Cederqvist's avatar
Per Cederqvist committed
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
{
    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.
422
423
 * 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
424
 */
425
static Bool
Per Cederqvist's avatar
Per Cederqvist committed
426
427
428
parse_unparsed(Connection *client)
{
    Success       status;
429
    union result_holder result;
Per Cederqvist's avatar
Per Cederqvist committed
430
431
432
433
434
435
        
    switch ( setjmp(parse_env) )
    {
    case 0 :
	/* Parse message. If message is complete call function and reply. */
	parse_packet(client);
436
	update_stat(STAT_REQUESTS, 1);
Per Cederqvist's avatar
Per Cederqvist committed
437
	status = call_function(client, &result);
438
	update_stat(STAT_REQUESTS, -1);
Per Cederqvist's avatar
Per Cederqvist committed
439
	reply(client, status, &result);
440
	client->penalty += param.penalty_per_call;
Per Cederqvist's avatar
Per Cederqvist committed
441
	free_parsed(client);
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

    if (!kill_pending)
    {
560
	source = isc_getoopsource(conn->isc_session);
561
562
563
	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
{
    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));

675
676
	update_stat(STAT_DNS_QUEUE, 1);
	
677
678
	res = hostname = isc_gethostname(addr, NULL, 0);

679
680
	update_stat(STAT_DNS_QUEUE, -1);

681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
	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;
}

702
703
704
705
706
707
708
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;
709
    if (saved_errno != ECONNRESET && saved_errno != EPIPE)
710
711
	kom_log("Failed to write to client %lu from %s: %s\n",
		cp->session_no, cp->peer, strerror(saved_errno));
712
    cp->penalty += param.max_penalty;
713
714
715
716
    add_to_kill_list(cp);
}


717

Per Cederqvist's avatar
Per Cederqvist committed
718
static void
719
login_request(struct isc_scb *session)
Per Cederqvist's avatar
Per Cederqvist committed
720
721
{
    Connection  * cp;
722
    const char *realuser;
723
    char *hostname = NULL;
724
    char peername[256];
725
726
727
    char portbuf[1+2+3*sizeof(long)];
    size_t hostlen;
    size_t portlen;
Per Cederqvist's avatar
Per Cederqvist committed
728
729

    /* Supress logins if /etc/nologin exists */
David Byers's avatar
David Byers committed
730
    if (fexists(param.nologin_file))
Per Cederqvist's avatar
Per Cederqvist committed
731
    {
732
733
734
	isc_puts("%% No logins allowed.\n", session);
	isc_flush(session);
 	isc_destroy(kom_server_mcb, session);
Per Cederqvist's avatar
Per Cederqvist committed
735
736
737
	return;
    }

738
    hostname = get_host_name(session->raddr);
739
    if (hostname == NULL)
David Byers's avatar
David Byers committed
740
	kom_log("WNG: login_request(): unknown hostid.\n");
741

742
    /* Get the real user name, as returned by the Ident protocol (rfc 931). */
743
    realuser = get_real_username(session, hostname);
744
    if (realuser == NULL && param.authentication_level == 2)
Per Cederqvist's avatar
Per Cederqvist committed
745
    {
David Byers's avatar
David Byers committed
746
	kom_log("Connection from %s rejected - no IDENT available.\n", 
747
	     hostname);
Per Cederqvist's avatar
Per Cederqvist committed
748

749
	isc_puts("%% No IDENT server reachable at your site.\n",
750
751
752
		 session);
	isc_flush(session);
	isc_destroy(kom_server_mcb, session);
753
	return;
Per Cederqvist's avatar
Per Cederqvist committed
754
    }
755

756
757
    /* Create a Connection, and link the Connection and the
       isc_session together. */
758

759
    cp = new_client();
760
761
    cp->isc_session = session;
    session->udg = cp;
762

763
764
765
766
767
    /* Start with max penalty, so that it doesn't pay to make a lot of
       new connections.  */
    cp->penalty = param.max_penalty;
    cp->penalty_generation = penalty_generation;

768
769
    if (hostname == NULL)
	s_crea_str(&cp->hostname, "unknown");
770
    else
771
772
773
774
775
776
	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));
777
778


779
    isc_getipnum(session->raddr, peername, sizeof(peername));
780
781
    hostlen = strlen(peername);
    if (hostlen >= sizeof(peername)-1)
782
783
784
785
    {
	kom_log("login_request(): truncated remote peer address %s.\n",
		peername);
    }
786
    sprintf(portbuf, " %d", isc_getportnum(session->raddr));
787
788
    portlen = strlen(portbuf);
    cp->peer = smalloc(hostlen + portlen + 1);
789
    strcpy(cp->peer, peername);
790
    strcpy(cp->peer + hostlen, portbuf);
791

792
    update_stat(STAT_CLIENTS, 1);
793
    dump_connections();
794
795

    isc_set_read_callback(session, data_available_callback, write_err_cb, cp);
Per Cederqvist's avatar
Per Cederqvist committed
796
797
798
}

static void
799
adjust_penalty(Connection *conn)
Per Cederqvist's avatar
Per Cederqvist committed
800
{
801
802
803
804
805
806
807
808
    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
809
810
811
812
}


static void
813
read_from_connection(Connection *conn)
Per Cederqvist's avatar
Per Cederqvist committed
814
{
815
    Bool would_block = FALSE;
816
    Bool need_flush = FALSE;
Per Cederqvist's avatar
Per Cederqvist committed
817

818
819
820
821
822
823
    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)
824
	    need_flush |= parse_unparsed(conn);
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

	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;
	}
    }
858

859
860
861
    if (need_flush)
	isc_flush(conn->isc_session);

862
863
864
865
866
867
868
    /* 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)
    {
869
870
871
872
873
	/* isc_disable() will fail if we have received EPIPE on
	   this socket.  In that case will soon close it, since
	   write_err_cb() has added it to the kill list. */
	if (isc_disable(conn->isc_session) == 0)
	    queue_add(conn);
874
    }
Per Cederqvist's avatar
Per Cederqvist committed
875
876
}

877

Per Cederqvist's avatar
Per Cederqvist committed
878
void
879
setup_timer(struct timeval *tv,
880
	    struct timeval interval)
Per Cederqvist's avatar
Per Cederqvist committed
881
{
882
883
884
885
886
    static int errcnt = 0;

    if (gettimeofday(tv, NULL) < 0)
    {
	if (errcnt < 20)
Per Cederqvist's avatar
Per Cederqvist committed
887
	{
888
889
890
891
892
	    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
893
	}
894
895
896
897
898
	
	*tv = OOP_TIME_NOW;
    }
    else
    {
899
900
	tv->tv_sec += interval.tv_sec;
	tv->tv_usec += interval.tv_usec;
901
	if (tv->tv_usec > 1000000)
902
	{
903
	    tv->tv_usec -= 1000000;
904
	    tv->tv_sec++;
905
	}
906
    }
907
908
    assert(tv->tv_usec >= 0);
    assert(tv->tv_usec < 1000000);
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
}

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;
927
928
    Connection *head = NULL;
    Connection *tail = NULL;
929
930
931
932
933
934
935
936
937

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

    if (is_idle && queue_first != NULL)
    {
	is_idle = FALSE;
	++penalty_generation;
938

939
	for (next = queue_first; next != NULL; )
Per Cederqvist's avatar
Per Cederqvist committed
940
	{
941
942
943
944
	    c = next;
	    next = next->queue_next;
	    adjust_penalty(c);
	    if (c->penalty < param.low_penalty)
Per Cederqvist's avatar
Per Cederqvist committed
945
	    {
946
		queue_remove(c);
947
948
949
950
951
952

		if (head == NULL)
		    head = c;
		else
		    tail->queue_next = c;
		tail = c;
Per Cederqvist's avatar
Per Cederqvist committed
953
	    }
954
955
956
	}
    }

957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
    for (next = head; next != NULL; )
    {
	c = next;
	next = next->queue_next;
	c->queue_next = NULL;
	if (isc_enable(c->isc_session) < 0)
	    restart_kom("failed to re-enable session\n");

	/* The call to read_from_connection() might add the
	   connection to the queue.  That's why we remove all entries
	   first, and use a private queue within this function.  */
	if (!go_and_die)
	    read_from_connection(c);
    }

972
973
974
    if (!is_idle)
	enable_idle_check();

975
976
    /* Check if a client issued a shutdown command.  */
    return go_and_die ? OOP_HALT : OOP_CONTINUE;
977
978
979
}

static void *
Per Cederqvist's avatar
Per Cederqvist committed
980
saver_callback(oop_source *source,
981
982
983
	       struct timeval UNUSED(tv),
	       void *user)
{
984
    struct timeval timeout;
985
    struct timeval *next_timer = user;
986

987
988
    timeout = end_of_atomic();
    setup_timer(next_timer, timeout);
Per Cederqvist's avatar
Per Cederqvist committed
989

990
991
992
    source->on_time(source, *next_timer, saver_callback, user);
    return OOP_CONTINUE;
}
Per Cederqvist's avatar
Per Cederqvist committed
993
994


995
996
997
998
999
1000
1001
1002
1003
1004
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);
1005
    assert(isc_getoopsource(conn->isc_session) == source);
1006
    assert(conn->on_queue == FALSE);
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037

    /* 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
1038

1039
	async_rejected_connection();
Per Cederqvist's avatar
Per Cederqvist committed
1040
    }
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
    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
1057
    start_garb_thread(source);
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085

    /* 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);

Per Cederqvist's avatar
Per Cederqvist committed
1086
    stop_garb_thread(source);
1087
    source->cancel_time(source, saver_timer, saver_callback, &saver_timer);
Per Cederqvist's avatar
Per Cederqvist committed
1088
1089
1090
1091
1092
1093
}

Bool
server_idle(void)
{
    return is_idle;
Per Cederqvist's avatar
Per Cederqvist committed
1094
}