summaryrefslogtreecommitdiff
path: root/src/connection.cpp
blob: cd994ea652870b469d6474a617ea01feb4b70e21 (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
/*       +------------------------------------+
 *       | Inspire Internet Relay Chat Daemon |
 *       +------------------------------------+
 *
 *  Inspire is copyright (C) 2002-2004 ChatSpike-Dev.
 *                       E-mail:
 *                <brain@chatspike.net>
 *           	  <Craig@chatspike.net>
 *     
 * Written by Craig Edwards, Craig McLure, and others.
 * This program is free but copyrighted software; see
 *            the file COPYING for details.
 *
 * ---------------------------------------------------
 */

#include <connection.h>
#include <unistd.h>
#include <fcntl.h>
#include <poll.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/utsname.h>
#include <vector>
#include <string>
#include <deque>
#include "inspircd.h"
#include "modules.h"
#include "inspstring.h"

using namespace std;


extern std::vector<Module*> modules;
extern std::vector<ircd_module*> factory;

extern int MODCOUNT;

extern time_t TIME;

connection::connection()
{
	fd = 0;
}


bool connection::CreateListener(char* newhost, int p)
{
	sockaddr_in host_address;
	int flags;
	in_addr addy;
	int on = 0;
	struct linger linger = { 0 };
	
	this->port = p;
	
	fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (fd <= 0)
	{
		return false;
	}

	setsockopt(fd,SOL_SOCKET,SO_REUSEADDR,(const char*)&on,sizeof(on));
	linger.l_onoff = 1;
	linger.l_linger = 1;
	setsockopt(fd,SOL_SOCKET,SO_LINGER,(const char*)&linger,sizeof(linger));
	
	// attempt to increase socket sendq and recvq as high as its possible
	// to get them on linux.
	int sendbuf = 32768;
	int recvbuf = 32768;
	setsockopt(fd,SOL_SOCKET,SO_SNDBUF,(const void *)&sendbuf,sizeof(sendbuf)); 
	setsockopt(fd,SOL_SOCKET,SO_RCVBUF,(const void *)&recvbuf,sizeof(sendbuf));

	memset((void*)&host_address, 0, sizeof(host_address));

	host_address.sin_family = AF_INET;

	if (!strcmp(newhost,""))
	{
		host_address.sin_addr.s_addr = htonl(INADDR_ANY);
	}
	else
	{
  		inet_aton(newhost,&addy);
		host_address.sin_addr = addy;
	}

	host_address.sin_port = htons(p);

	if (bind(fd,(sockaddr*)&host_address,sizeof(host_address))<0)
	{
		return false;
	}

	// make the socket non-blocking
	flags = fcntl(fd, F_GETFL, 0);
	fcntl(fd, F_SETFL, flags | O_NONBLOCK);

	this->port = p;

	listen(this->fd,5);

	return true;
}

char* ircd_connector::GetServerIP()
{
	return this->host;
}

int ircd_connector::GetServerPort()
{
	return this->port;
}

bool ircd_connector::SetHostAndPort(char* newhost, int newport)
{
	strncpy(this->host,newhost,160);
	this->port = newport;
	return true;
}

bool ircd_connector::SetHostAddress(char* newhost, int newport)
{
	strncpy(this->host,newhost,160);
	this->port = newport;
	memset((void*)&addr, 0, sizeof(addr));
	addr.sin_family = AF_INET;
	inet_aton(host,&addr.sin_addr);
	addr.sin_port = htons(port);
	return true;
}

void ircd_connector::SetServerPort(int p)
{
	this->port = p;
}

void ircd_connector::AddBuffer(std::string a)
{
	for (int i = 0; i < a.length(); i++)
		if (a[i] != '\r')
			ircdbuffer = ircdbuffer + a[i];
}

bool ircd_connector::BufferIsComplete()
{
	for (int i = 0; i < ircdbuffer.length(); i++)
		if (ircdbuffer[i] == '\n')
			return true;
	return false;
}

void ircd_connector::ClearBuffer()
{
	while ((ircdbuffer != "") && (ircdbuffer[0] != '\n'))
	{
		ircdbuffer.erase(ircdbuffer.begin());
	}
	if (ircdbuffer != "")
		ircdbuffer.erase(ircdbuffer.begin());
}

std::string ircd_connector::GetBuffer()
{
	std::string z = "";
	long t = 0;
	while (ircdbuffer[t] != '\n')
	{
		z = z + ircdbuffer[t];
		t++;
	}
	return z;
}

bool ircd_connector::MakeOutboundConnection(char* newhost, int newport)
{
	log(DEBUG,"MakeOutboundConnection: Original param: %s",newhost);
	ClearBuffer();
	hostent* hoste = gethostbyname(newhost);
	if (!hoste)
	{
		log(DEBUG,"MakeOutboundConnection: gethostbyname was NULL, setting %s",newhost);
		this->SetHostAddress(newhost,newport);
		SetHostAndPort(newhost,newport);
	}
	else
	{
		struct in_addr* ia = (in_addr*)hoste->h_addr;
		log(DEBUG,"MakeOutboundConnection: gethostbyname was valid, setting %s",inet_ntoa(*ia));
		this->SetHostAddress(inet_ntoa(*ia),newport);
		SetHostAndPort(inet_ntoa(*ia),newport);
	}

	this->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (this->fd >= 0)
	{
		if(connect(this->fd, (sockaddr*)&this->addr,sizeof(this->addr)))
		{
			WriteOpers("connect() failed for %s",host);
			RemoveServer(this->servername.c_str());
			return false;
		}
		int flags = fcntl(this->fd, F_GETFL, 0);
		fcntl(this->fd, F_SETFL, flags | O_NONBLOCK);
		int sendbuf = 32768;
		int recvbuf = 32768;
		setsockopt(this->fd,SOL_SOCKET,SO_SNDBUF,(const void *)&sendbuf,sizeof(sendbuf)); 
		setsockopt(this->fd,SOL_SOCKET,SO_RCVBUF,(const void *)&recvbuf,sizeof(sendbuf));
		return true;
	}
	else
	{
		WriteOpers("socket() failed!");
		RemoveServer(this->servername.c_str());
	}

	return false;
}


bool connection::BeginLink(char* targethost, int newport, char* password, char* servername, int myport)
{
	char connect[MAXBUF];
	
	ircd_connector connector;
	ircd_connector *cn = this->FindHost(servername);


	if (cn)
	{
		WriteOpers("CONNECT aborted: Server %s already exists",servername);
		return false;
	}

	
	if (this->fd)
	{
		if (connector.MakeOutboundConnection(targethost,newport))
		{
			// targethost has been turned into an ip...
			// we dont want this as the server name.
			connector.SetServerName(servername);
			snprintf(connect,MAXBUF,"S %s %s %lu %lu :%s",getservername().c_str(),password,(unsigned long)myport,(unsigned long)GetRevision(),getserverdesc().c_str());
			connector.SetState(STATE_NOAUTH_OUTBOUND);
			connector.SetHostAndPort(targethost, newport);
			this->connectors.push_back(connector);
			return this->SendPacket(connect, servername);
		}
		else
		{
			connector.SetState(STATE_DISCONNECTED);
			WriteOpers("Could not create outbound connection to %s:%d",targethost,newport);
		}
	}
	return false;
}

bool connection::MeshCookie(char* targethost, int newport, unsigned long cookie, char* servername)
{
	char connect[MAXBUF];
	
	ircd_connector connector;
	
	WriteOpers("Establishing meshed link to %s:%d",servername,newport);

	if (this->fd)
	{
		if (connector.MakeOutboundConnection(targethost,newport))
		{
			// targethost has been turned into an ip...
			// we dont want this as the server name.
			connector.SetServerName(servername);
			snprintf(connect,MAXBUF,"- %lu %s :%s",cookie,getservername().c_str(),getserverdesc().c_str());
			connector.SetState(STATE_NOAUTH_OUTBOUND);
			connector.SetHostAndPort(targethost, newport);
			connector.SetState(STATE_CONNECTED);
			this->connectors.push_back(connector);
			return this->SendPacket(connect, servername);
		}
		else
		{
			connector.SetState(STATE_DISCONNECTED);
			WriteOpers("Could not create outbound connection to %s:%d",targethost,newport);
		}
	}
	return false;
}

bool connection::AddIncoming(int newfd, char* targethost, int sourceport)
{
	ircd_connector connector;
	
	// targethost has been turned into an ip...
	// we dont want this as the server name.
	connector.SetServerName(targethost);
	connector.SetDescriptor(newfd);
	connector.SetState(STATE_NOAUTH_INBOUND);
	int flags = fcntl(newfd, F_GETFL, 0);
	fcntl(newfd, F_SETFL, flags | O_NONBLOCK);
	int sendbuf = 32768;
	int recvbuf = 32768;
	setsockopt(newfd,SOL_SOCKET,SO_SNDBUF,(const void *)&sendbuf,sizeof(sendbuf)); 
	setsockopt(newfd,SOL_SOCKET,SO_RCVBUF,(const void *)&recvbuf,sizeof(sendbuf));
	connector.SetHostAndPort(targethost, sourceport);
	connector.SetState(STATE_NOAUTH_INBOUND);
	log(DEBUG,"connection::AddIncoming() Added connection: %s:%d",targethost,sourceport);
	this->connectors.push_back(connector);
	return true;
}

void connection::TerminateLink(char* targethost)
{
	// this locates the targethost in the connection::connectors vector of the class,
 	// and terminates it by sending it an SQUIT token and closing its descriptor.
	// TerminateLink with a null string causes a terminate of ALL links
}


// Returns a pointer to the connector for 'host'
ircd_connector* connection::FindHost(std::string findhost)
{
	for (int i = 0; i < this->connectors.size(); i++)
	{
		if (this->connectors[i].GetServerName() == findhost)
		{
			return &this->connectors[i];
		}
	}
	return NULL;
}

std::string ircd_connector::GetServerName()
{
	return this->servername;
}

std::string ircd_connector::GetDescription()
{
	return this->description;
}

void ircd_connector::SetServerName(std::string serv)
{
	this->servername = serv;
}

void ircd_connector::SetDescription(std::string desc)
{
	this->description = desc;
}


int ircd_connector::GetDescriptor()
{
	return this->fd;
}

int ircd_connector::GetState()
{
	return this->state;
}


void ircd_connector::SetState(int newstate)
{
	this->state = newstate;
	if (state == STATE_DISCONNECTED)
	{
		NetSendMyRoutingTable();
	}
}

void ircd_connector::CloseConnection()
{
	int flags = fcntl(this->fd, F_GETFL, 0);
	fcntl(this->fd, F_SETFL, flags ^ O_NONBLOCK);
	close(this->fd);
	flags = fcntl(this->fd, F_GETFL, 0);
	fcntl(this->fd, F_SETFL, flags | O_NONBLOCK);
}

void ircd_connector::SetDescriptor(int newfd)
{
	this->fd = newfd;
}

bool connection::SendPacket(char *message, const char* sendhost)
{
	if ((!message) || (!sendhost))
		return true;

	ircd_connector* cn = this->FindHost(sendhost);
	
	if (!strchr(message,'\n'))
	{
		strlcat(message,"\n",MAXBUF);
	}

	if (cn)
	{
		log(DEBUG,"main: Connection::SendPacket() sent '%s' to %s",message,cn->GetServerName().c_str());
		
		if (cn->GetState() == STATE_DISCONNECTED)
		{
			log(DEBUG,"Main route to %s is down, seeking alternative",host);
			// fix: can only route one hop to avoid a loop
			if (strncmp(message,"R ",2))
			{
				// this route is down, we must re-route the packet through an available point in the mesh.
				for (int k = 0; k < this->connectors.size(); k++)
				{
					// search for another point in the mesh which can 'reach' where we want to go
					for (int m = 0; m < this->connectors[k].routes.size(); m++)
					{
						if (!strcasecmp(this->connectors[k].routes[m].c_str(),sendhost))
						{
							log(DEBUG,"Found alternative route for packet: %s",this->connectors[k].GetServerName().c_str());
							char buffer[MAXBUF];
							snprintf(buffer,MAXBUF,"R %s %s",sendhost,message);
							this->SendPacket(buffer,this->connectors[k].GetServerName().c_str());
							return true;
						}
					}
				}
			}
			char buffer[MAXBUF];
			snprintf(buffer,MAXBUF,"& %s",sendhost);
			NetSendToAllExcept(sendhost,buffer);
			log(DEBUG,"There are no routes to %s, we're gonna boot the server off!",sendhost);
			DoSplit(sendhost);
			return false;
		}

		// returns false if the packet could not be sent (e.g. target host down)
		if (send(cn->GetDescriptor(),message,strlen(message),0)<0)
		{
			log(DEBUG,"send() failed for Connection::SendPacket(): %s",strerror(errno));
			log(DEBUG,"Disabling connector: %s",cn->GetServerName().c_str());
			cn->CloseConnection();
			cn->SetState(STATE_DISCONNECTED);
			// retry the packet along a new route so either arrival OR failure are gauranteed (bugfix)
			return this->SendPacket(message,sendhost);
		}
		return true;
	}
}

// receives a packet from any where there is data waiting, first come, first served
// fills the message and host values with the host where the data came from.

bool connection::RecvPacket(std::deque<std::string> &messages, char* recvhost)
{
	char data[4096];
	memset(data, 0, 4096);
	for (int i = 0; i < this->connectors.size(); i++)
	{
		if (this->connectors[i].GetState() != STATE_DISCONNECTED)
		{
			// returns false if the packet could not be sent (e.g. target host down)
			int rcvsize = 0;
			rcvsize = recv(this->connectors[i].GetDescriptor(),data,32,0);
			data[rcvsize] = '\0';
			if (rcvsize == -1)
			{
				if (errno != EAGAIN)
				{
					log(DEBUG,"recv() failed for Connection::RecvPacket(): %s",strerror(errno));
					log(DEBUG,"Disabling connector: %s",this->connectors[i].GetServerName().c_str());
					this->connectors[i].CloseConnection();
					this->connectors[i].SetState(STATE_DISCONNECTED);
				}
			}
			if (rcvsize > 0)
			{
				this->connectors[i].AddBuffer(data);
				if (this->connectors[i].BufferIsComplete())
				{
					messages.push_back(this->connectors[i].GetBuffer().c_str());
					strlcpy(host,this->connectors[i].GetServerName().c_str(),160);
					log(DEBUG,"main: Connection::RecvPacket() got '%s' from %s",this->connectors[i].GetBuffer().c_str(),recvhost);
					this->connectors[i].ClearBuffer();
					return true;
				}
			}
		}
	}
	// nothing new yet -- message and host will be undefined
	return false;
}

long connection::GenKey()
{
	return (random()*time(NULL));
}