summaryrefslogtreecommitdiff
path: root/src/irc/bot/botnet-connection.c
blob: 387cce4556a7e97fb8a1cdf3a620dbad824c1d70 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
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
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
/*
 botnet-connection.c : IRC bot plugin for irssi

    Copyright (C) 1999-2000 Timo Sirainen

    This program 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 2 of the License, or
    (at your option) any later version.

    This program 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 this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include "module.h"
#include "network.h"
#include "net-nonblock.h"
#include "signals.h"
#include "commands.h"
#include "misc.h"
#include "line-split.h"
#include "lib-config/iconfig.h"

#include "botnet.h"
#include "bot-users.h"

#define BOTNET_RECONNECT_TIME (60*5)

static int reconnect_tag;

static int sig_reconnect(void)
{
	GSList *tmp;

	for (tmp = botnets; tmp != NULL; tmp = tmp->next) {
		BOTNET_REC *rec = tmp->data;

		if (rec->reconnect)
                        botnet_connect(rec);
	}

	return 1;
}

static void sig_bot_read(BOT_REC *bot)
{
	BOTNET_REC *botnet;
	char tmpbuf[1024], *str;
	int ret, recvlen, reconnect;

	botnet = bot->botnet;
	for (;;) {
		recvlen = bot->handle == -1 ? -1 :
			net_receive(bot->handle, tmpbuf, sizeof(tmpbuf));
		ret = line_split(tmpbuf, recvlen, &str, (LINEBUF_REC **) &bot->buffer);

		if (ret == 0)
			break;
		if (ret == -1) {
			/* connection lost */
                        reconnect = !bot->disconnect && bot->uplink;
			bot_destroy(bot);

			if (reconnect) {
				/* wasn't intentional disconnection from
				   our uplink, reconnect */
				botnet_connect(botnet);
			}
			break;
		}

                fprintf(stderr, "%s\r\n", str);
		signal_emit("botnet event", 2, bot, str);
	}
}

static void connect_downlink(BOTNET_REC *botnet, int handle,
			     IPADDR *ip, const char *host)
{
	BOT_DOWNLINK_REC *downlink;
	BOT_REC *bot;

	g_return_if_fail(botnet != NULL);

	/* identify the bot who's trying to connect.. */
	downlink = bot_downlink_find(botnet, ip, host);
	if (downlink == NULL || downlink->password == NULL) {
		/* unknown bot, close connection /
		   bot didn't have password, don't let it connect to us */
		net_disconnect(handle);
		return;
	}

	bot = g_new0(BOT_REC, 1);
	bot->botnet = botnet;
	bot->link = downlink;
	g_node_append_data(botnet->bots, bot);

	/* connected.. */
	bot->handle = handle;
	bot->read_tag = g_input_add(handle, G_INPUT_READ, (GInputFunction) sig_bot_read, bot);
}

typedef struct {
	char *botnet;
	IPADDR ip;
	int handle;
} BOT_CONNECT_REC;

static void sig_host_got(RESOLVED_NAME_REC *name, BOT_CONNECT_REC *rec)
{
	BOTNET_REC *botnet;

	botnet = botnet_find(rec->botnet);
	if (botnet == NULL || !botnet->connected) {
		/* this botnet isn't connected anymore.. */
		net_disconnect(rec->handle);
	} else {
		connect_downlink(botnet, rec->handle, &rec->ip,
				 name->error ? NULL : name->name);
	}
        g_free(rec->botnet);
	g_free(rec);
}

static void sig_botnet_listen(BOTNET_REC *botnet)
{
	BOT_CONNECT_REC *rec;
	IPADDR ip;
	int handle;

	g_return_if_fail(botnet != NULL);

	/* accept connection */
	handle = net_accept(botnet->listen_handle, &ip, NULL);
	if (handle == -1)
		return;

	rec = g_new0(BOT_CONNECT_REC, 1);
	rec->botnet = g_strdup(botnet->name);
	memcpy(&rec->ip, &ip, sizeof(IPADDR));
        rec->handle = handle;

	if (!net_gethostbyaddr_nonblock(&ip, (NET_HOST_CALLBACK) sig_host_got, rec)) {
		/* failed for some reason, try without host */
		connect_downlink(botnet, handle, &ip, NULL);
                g_free(rec->botnet);
		g_free(rec);
	}
}

static int botnet_listen(BOTNET_REC *botnet)
{
	IPADDR addr;
	int port;

	g_return_val_if_fail(botnet != NULL, FALSE);

	if (botnet->port <= 0)
		return FALSE;

	port = botnet->port;
	if (botnet->addr == NULL)
		botnet->listen_handle = net_listen(NULL, &port);
	else {
		net_host2ip(botnet->addr, &addr);
		botnet->listen_handle = net_listen(&addr, &port);
	}

	if (botnet->listen_handle == -1) {
		g_warning("Couldn't start listening botnet\n");
		return FALSE;
	}

	botnet->listen_tag = g_input_add(botnet->listen_handle, G_INPUT_READ,
					 (GInputFunction) sig_botnet_listen, botnet);

	return TRUE;
}

static void sig_botnet_connected(int handle, BOT_UPLINK_REC *uplink)
{
	BOTNET_REC *botnet;
	BOT_REC *bot;

	g_return_if_fail(uplink != NULL);

	botnet = uplink->botnet;

	if (handle == -1) {
		/* error, try another bot */
		botnet_connect(botnet);
		return;
	}

	/* connected to bot */
	bot = g_new0(BOT_REC, 1);
        bot->botnet = botnet;
	bot->link = uplink;
	bot->uplink = TRUE;

	bot->handle = handle;
	bot->read_tag = g_input_add(handle, G_INPUT_READ, (GInputFunction) sig_bot_read, bot);

	botnet->uplink = bot;
	g_node_append_data(botnet->bots, bot);

	/* send nick/pass */
	bot_send_cmdv(bot, "PASS %s", uplink->password);
	bot_send_cmdv(bot, "NICK %s", botnet->nick);
}

void botnet_connect(BOTNET_REC *botnet)
{
	BOT_REC *bot;
	BOT_UPLINK_REC *uplink, *best;
	GSList *tmp;
	time_t now;

	g_return_if_fail(botnet != NULL);

	botnet->reconnect = FALSE;
	if (botnet->bots == NULL) {
		/* create bot record for us */
		bot = g_new0(BOT_REC, 1);
		bot->botnet = botnet;
		bot->nick = g_strdup(botnet->nick);
		bot->priority = botnet->priority;
		bot->connected = TRUE;
		bot->master = TRUE;

		bot->handle = -1;
		bot->read_tag = -1;

		botnet->connected = TRUE;
		botnet->master = bot;

		botnet->bots = g_node_new(bot);
	}

	if (botnet->listen_handle == -1) {
		/* start listening */
		botnet_listen(botnet);
	}

	if (botnet->uplinks == NULL) {
		/* we have no uplinks */
		return;
	}

	/* find some bot where we can try to connect to */
	now = time(NULL);
	uplink = best = NULL;
	for (tmp = botnet->uplinks; tmp != NULL; tmp = tmp->next) {
		uplink = tmp->data;

		if (uplink->last_connect+BOTNET_RECONNECT_TIME > now)
			continue;

		if (uplink->last_connect == 0) {
			/* haven't yet tried to connect to this bot */
			best = uplink;
			break;
		}

		if (best == NULL || uplink->last_connect < best->last_connect)
			best = uplink;
	}

	if (best == NULL) {
		/* reconnect later */
		botnet->reconnect = TRUE;
		return;
	}

	/* connect to uplink */
	best->last_connect = time(NULL);
	net_connect_nonblock(best->host, best->port, NULL, (NET_CALLBACK) sig_botnet_connected, best);
}

static int botnet_send_botinfo(GNode *node, BOT_REC *client)
{
	BOT_REC *parent, *bot;

	bot = node->data;
	parent = node->parent == NULL ? NULL : node->parent->data;
	if (parent == NULL && client->uplink) parent = client;

	bot_send_cmdv(client, "%s - BOTINFO %s %s %d", bot->botnet->nick, bot->nick,
		      parent != NULL ? parent->nick : "-", bot->priority);
	return FALSE;
}

/* send botnet links to specified bot */
static void botnet_send_links(BOT_REC *bot, int downlinks)
{
	GNode *node;

	if (!downlinks) {
		/* send uplinks */
		if (bot->botnet->uplink == NULL)
			return;

		node = g_node_find(bot->botnet->bots, G_IN_ORDER,
				   G_TRAVERSE_ALL, bot->botnet->uplink);
		if (node == NULL)
			return;

		g_node_traverse(node, G_LEVEL_ORDER, G_TRAVERSE_ALL, -1,
				(GNodeTraverseFunc) botnet_send_botinfo, bot);
		return;
	}

        /* send downlinks = all non-uplink nodes */
	for (node = bot->botnet->bots->children; node != NULL; node = node->next) {
		BOT_REC *rec = node->data;

		if (rec == bot || rec->uplink || !rec->connected)
			continue;

		g_node_traverse(node, G_LEVEL_ORDER, G_TRAVERSE_ALL, -1,
				(GNodeTraverseFunc) botnet_send_botinfo, bot);
	}
}

static void botnet_connect_event_uplink(BOT_REC *bot, const char *data)
{
	BOTNET_REC *botnet;
	BOT_REC *ownbot;
	char *str, *p;
	int num;

	botnet = bot->botnet;
	g_return_if_fail(botnet != NULL);

	if (g_strcasecmp(data, "NICKERROR") == 0) {
		/* nick already in use, change it by adding a number
		   at the end of it */
		p = botnet->nick+strlen(botnet->nick);
		while (p > botnet->nick && isdigit(p[-1])) p--;
		num = *p == '\0' ? 2 : atoi(p)+1; *p = '\0';
		str = g_strdup_printf("%s%d", botnet->nick, num);
		g_free(botnet->nick); botnet->nick = str;

		ownbot = botnet->bots->data;
		g_free(ownbot->nick); ownbot->nick = g_strdup(str);

		/* try again.. */
		bot_send_cmdv(bot, "NICK %s", botnet->nick);

		return;
	}

	if (g_strcasecmp(data, "CONNECTED") == 0) {
		/* connected, wait for SYNC command */
		bot->connected = TRUE;
		return;
	}

	/* error? what? */
}

static void botnet_event(BOT_REC *bot, const char *data)
{
	BOT_DOWNLINK_REC *downlink;
	char *fname;

	g_return_if_fail(bot != NULL);
	g_return_if_fail(data != NULL);

	if (bot->connected)
		return;

	signal_stop_by_name("botnet event");

	if (bot->uplink) {
		botnet_connect_event_uplink(bot, data);
		return;
	}

	downlink = bot->link;

	if (!bot->pass_ok && g_strncasecmp(data, "PASS ", 5) == 0) {
		/* password sent, check that it matches */
		if (strcmp(data+5, downlink->password) == 0) {
			/* ok, connected! */
                        bot->pass_ok = TRUE;
		} else {
			/* wrong password, disconnect */
			bot_disconnect(bot);
		}
		return;
	}

	if (g_strncasecmp(data, "NICK ", 5) == 0) {
		/* set bot's nick */
		if (!bot->pass_ok) {
			/* password has to be sent before nick, kill the
			   stupid bot. */
			bot_disconnect(bot);
			return;
		}

		if (g_strcasecmp(bot->botnet->nick, data+5) == 0 ||
		    bot_find_nick(bot->botnet, data+5) != NULL) {
			/* nick already exists */
			bot_send_cmd(bot, "NICKERROR");
			return;
		}

		/* set the nick */
		bot->nick = g_strdup(data+5);
		bot->connected = TRUE;
		bot_send_cmd(bot, "CONNECTED");

		/* send info about all the bots that are connected now
		   to this botnet */
		botnet_send_botinfo(bot->botnet->bots, bot);
		botnet_send_links(bot, FALSE);
		botnet_send_links(bot, TRUE);
		bot_send_cmdv(bot, "%s - MASTER %s", bot->botnet->nick, bot->botnet->master->nick);

		/* send our current user configuration */
		fname = g_strdup_printf("%s/.irssi/users.temp", g_get_home_dir());
		botuser_save(fname);
		botnet_send_file(bot->botnet, bot->nick, fname);
		g_free(fname);

		/* send sync msg */
		bot_send_cmdv(bot, "%s - SYNC", bot->botnet->nick);
		return;
	}

	/* pass/nick not sent yet */
	bot_send_cmd(bot, "ERROR");
}

static void botnet_event_sync(BOT_REC *bot)
{
	/* send our record to host */
	botnet_send_botinfo(bot->botnet->bots, bot);

	/* send our downlinks to host */
	botnet_send_links(bot, TRUE);

	signal_stop_by_name("botnet event");
}

static BOT_REC *bot_add(BOTNET_REC *botnet, const char *nick, const char *parent)
{
	GNode *node;
	BOT_REC *rec;

	g_return_val_if_fail(botnet != NULL, NULL);
	g_return_val_if_fail(nick != NULL, NULL);

	node = bot_find_nick(botnet, nick);
	if (node != NULL) return node->data;

	node = bot_find_nick(botnet, parent);
	if (node == NULL) return NULL;

	rec = g_new0(BOT_REC, 1);
	rec->botnet = botnet;
	rec->nick = g_strdup(nick);

	rec->handle = -1;
	rec->read_tag = -1;
	rec->connected = TRUE;

	g_node_append_data(node, rec);
	return rec;
}

static void botnet_event_botinfo(BOT_REC *bot, const char *data, const char *sender)
{
	char *params, *nick, *parent, *priority;
        BOT_REC *rec;

	/*str = g_strdup_printf("BOTINFO %s", data);
	botnet_broadcast(bot->botnet, bot, sender, str);
	g_free(str);*/

	params = cmd_get_params(data, 3, &nick, &parent, &priority);
	if (*parent == '-' && parent[1] == '\0')
		parent = NULL;

	if (parent == NULL && bot->botnet->uplink != NULL &&
	    bot->botnet->uplink == bot) {
                /* our uplink */
		if (bot->nick == NULL) bot->nick = g_strdup(nick);
		rec = bot;
	} else {
		rec = bot_add(bot->botnet, nick, parent);
	}

	if (rec != NULL) {
		rec->priority = atoi(priority);
	}
	g_free(params);
}

static void botnet_event_botquit(BOT_REC *bot, const char *data)
{
	GNode *node;

	node = bot_find_nick(bot->botnet, data);
	if (node != NULL) bot_destroy(node->data);

	signal_stop_by_name("botnet event");
}

static void sig_bot_disconnected(BOT_REC *bot)
{
	BOT_REC *master, *tmpbot;
	GNode *node;
	char *str;

	if (!bot->botnet->connected)
		return;

	if (bot->connected && bot->handle != -1) {
		/* send notice to rest of the botnet about quit */
		str = g_strdup_printf("BOTQUIT %s", bot->nick);
		botnet_broadcast(bot->botnet, bot, NULL, str);
		g_free(str);
	}

	if (bot->master) {
		/* master quit */
		node = bot_find_path(bot->botnet, bot->nick);
		tmpbot = node == NULL ? NULL : node->data;

		if (tmpbot != NULL && tmpbot->disconnect) {
			/* we lost the connection to master - find new
			   master for the botnet*/
			master = botnet_find_master(bot->botnet, NULL);
			botnet_set_master(bot->botnet, master);

			str = g_strdup_printf("MASTER %s", master->nick);
			botnet_broadcast(bot->botnet, bot, NULL, str);
			g_free(str);
		}
	}
}

static int print_bot(GNode *node)
{
	BOT_REC *bot = node->data;

	fprintf(stderr, "%s %d %d\r\n", bot->nick, bot->connected, bot->disconnect);
	return FALSE;
}

static void cmd_bots(void)
{
	BOTNET_REC *botnet = botnet_find("ircnet");

	fprintf(stderr, "\r\n");
	g_node_traverse(botnet->bots, G_LEVEL_ORDER, G_TRAVERSE_ALL, -1,
			(GNodeTraverseFunc) print_bot, NULL);
}

void botnet_connection_init(void)
{
	reconnect_tag = g_timeout_add(BOTNET_RECONNECT_TIME*1000, (GSourceFunc) sig_reconnect, NULL);

	signal_add("botnet event", (SIGNAL_FUNC) botnet_event);
	signal_add("botnet event sync", (SIGNAL_FUNC) botnet_event_sync);
	signal_add("botnet event botinfo", (SIGNAL_FUNC) botnet_event_botinfo);
	signal_add("botnet event botquit", (SIGNAL_FUNC) botnet_event_botquit);
	signal_add("bot disconnected", (SIGNAL_FUNC) sig_bot_disconnected);
	command_bind("bots", NULL, (SIGNAL_FUNC) cmd_bots);
}

void botnet_connection_deinit(void)
{
	g_source_remove(reconnect_tag);

	signal_remove("botnet event", (SIGNAL_FUNC) botnet_event);
	signal_remove("botnet event sync", (SIGNAL_FUNC) botnet_event_sync);
	signal_remove("botnet event botinfo", (SIGNAL_FUNC) botnet_event_botinfo);
	signal_remove("botnet event botquit", (SIGNAL_FUNC) botnet_event_botquit);
	signal_remove("bot disconnected", (SIGNAL_FUNC) sig_bot_disconnected);
	command_unbind("bots", (SIGNAL_FUNC) cmd_bots);
}