summaryrefslogtreecommitdiff
path: root/src/inspsocket.cpp
blob: d712e5c19675ebfbc9429e287cf24e571b4e22cb (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
/*       +------------------------------------+
 *       | Inspire Internet Relay Chat Daemon |
 *       +------------------------------------+
 *
 *  InspIRCd is copyright (C) 2002-2006 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 "socket.h"
#include "configreader.h"
#include "inspstring.h"
#include "socketengine.h"
#include "inspircd.h"

using irc::sockets::OpenTCPSocket;
using irc::sockets::insp_inaddr;
using irc::sockets::insp_sockaddr;

bool InspSocket::Readable()
{
	return ((this->state != I_CONNECTING) && (this->WaitingForWriteEvent == false));
}

InspSocket::InspSocket(InspIRCd* SI)
{
	this->state = I_DISCONNECTED;
	this->fd = -1;
	this->WaitingForWriteEvent = false;
	this->Instance = SI;
}

InspSocket::InspSocket(InspIRCd* SI, int newfd, const char* ip)
{
	this->fd = newfd;
	this->state = I_CONNECTED;
	strlcpy(this->IP,ip,MAXBUF);
	this->WaitingForWriteEvent = false;
	this->Instance = SI;
	if (this->fd > -1)
		this->Instance->SE->AddFd(this);
}

InspSocket::InspSocket(InspIRCd* SI, const std::string &ipaddr, int aport, bool listening, unsigned long maxtime)
{
	this->fd = -1;
	this->Instance = SI;
	strlcpy(host,ipaddr.c_str(),MAXBUF);
	this->WaitingForWriteEvent = false;
	if (listening)
	{
		if ((this->fd = OpenTCPSocket()) == ERROR)
		{
			this->fd = -1;
			this->state = I_ERROR;
			this->OnError(I_ERR_SOCKET);
			this->Instance->Log(DEBUG,"OpenTCPSocket() error");
			return;
		}
		else
		{
			if (!SI->BindSocket(this->fd,this->client,this->server,aport,(char*)ipaddr.c_str()))
			{
				this->Instance->Log(DEBUG,"BindSocket() error %s",strerror(errno));
				this->Close();
				this->fd = -1;
				this->state = I_ERROR;
				this->OnError(I_ERR_BIND);
				this->ClosePending = true;
				return;
			}
			else
			{
				this->state = I_LISTENING;
				if (this->fd > -1)
				{
					if (!this->Instance->SE->AddFd(this))
					{
						this->Close();
						this->state = I_ERROR;
						this->OnError(I_ERR_NOMOREFDS);
					}
				}
				this->Instance->Log(DEBUG,"New socket now in I_LISTENING state");
				return;
			}
		}			
	}
	else
	{
		strlcpy(this->host,ipaddr.c_str(),MAXBUF);
		this->port = aport;

		if (insp_aton(host,&addy) < 1)
		{
			this->Instance->Log(DEBUG,"You cannot pass hostnames to InspSocket, resolve them first with Resolver!");
			this->Close();
			this->fd = -1;
			this->state = I_ERROR;
			this->OnError(I_ERR_RESOLVE);
			return;
		}
		else
		{
			this->Instance->Log(DEBUG,"No need to resolve %s",this->host);
			strlcpy(this->IP,host,MAXBUF);
			timeout_val = maxtime;
			this->DoConnect();
		}
	}
}

void InspSocket::WantWrite()
{
	this->Instance->SE->WantWrite(this);
}

void InspSocket::SetQueues(int nfd)
{
	// attempt to increase socket sendq and recvq as high as its possible
	int sendbuf = 32768;
	int recvbuf = 32768;
	setsockopt(nfd,SOL_SOCKET,SO_SNDBUF,(const void *)&sendbuf,sizeof(sendbuf));
	setsockopt(nfd,SOL_SOCKET,SO_RCVBUF,(const void *)&recvbuf,sizeof(sendbuf));
}

/* Most irc servers require you to specify the ip you want to bind to.
 * If you dont specify an IP, they rather dumbly bind to the first IP
 * of the box (e.g. INADDR_ANY). In InspIRCd, we scan thought the IP
 * addresses we've bound server ports to, and we try and bind our outbound
 * connections to the first usable non-loopback and non-any IP we find.
 * This is easier to configure when you have a lot of links and a lot
 * of servers to configure.
 */
bool InspSocket::BindAddr()
{
	insp_inaddr n;
	ConfigReader Conf(this->Instance);

	this->Instance->Log(DEBUG,"In InspSocket::BindAddr()");
	for (int j =0; j < Conf.Enumerate("bind"); j++)
	{
		std::string Type = Conf.ReadValue("bind","type",j);
		std::string IP = Conf.ReadValue("bind","address",j);
		if (Type == "servers")
		{
			if ((IP != "*") && (IP != "127.0.0.1") && (IP != ""))
			{
				insp_sockaddr s;

				if (insp_aton(IP.c_str(),&n) > 0)
				{
					this->Instance->Log(DEBUG,"Found an IP to bind to: %s",IP.c_str());
#ifdef IPV6
					s.sin6_addr = n;
					s.sin6_family = AF_FAMILY;
#else
					s.sin_addr = n;
					s.sin_family = AF_FAMILY;
#endif
					if (bind(this->fd,(struct sockaddr*)&s,sizeof(s)) < 0)
					{
						this->Instance->Log(DEBUG,"Cant bind()");
						this->state = I_ERROR;
						this->OnError(I_ERR_BIND);
						this->fd = -1;
						return false;
					}
					this->Instance->Log(DEBUG,"bind() reports outbound fd bound to ip %s",IP.c_str());
					return true;
				}
				else
				{
					this->Instance->Log(DEBUG,"Address '%s' was not an IP address",IP.c_str());
				}
			}
		}
	}
	this->Instance->Log(DEBUG,"Found no suitable IPs to bind, binding INADDR_ANY");
	return true;
}

bool InspSocket::DoConnect()
{
	this->Instance->Log(DEBUG,"In DoConnect()");
	if ((this->fd = socket(AF_FAMILY, SOCK_STREAM, 0)) == -1)
	{
		this->Instance->Log(DEBUG,"Cant socket()");
		this->state = I_ERROR;
		this->OnError(I_ERR_SOCKET);
		return false;
	}

	if ((strstr(this->IP,"::ffff:") != (char*)&this->IP) && (strstr(this->IP,"::FFFF:") != (char*)&this->IP))
	{
		if (!this->BindAddr())
			return false;
	}

	this->Instance->Log(DEBUG,"Part 2 DoConnect() %s",this->IP);
	insp_aton(this->IP,&addy);
#ifdef IPV6
	addr.sin6_family = AF_FAMILY;
	memcpy(&addr.sin6_addr, &addy, sizeof(insp_inaddr));
	addr.sin6_port = htons(this->port);
#else
	addr.sin_family = AF_FAMILY;
	addr.sin_addr = addy;
	addr.sin_port = htons(this->port);
#endif

	int flags;
	flags = fcntl(this->fd, F_GETFL, 0);
	fcntl(this->fd, F_SETFL, flags | O_NONBLOCK);

	if (connect(this->fd, (sockaddr*)&this->addr,sizeof(this->addr)) == -1)
	{
		if (errno != EINPROGRESS)
		{
			this->Instance->Log(DEBUG,"Error connect() %d: %s",this->fd,strerror(errno));
			this->OnError(I_ERR_CONNECT);
			this->Close();
			this->state = I_ERROR;
			return false;
		}

		this->Timeout = new SocketTimeout(this->GetFd(), this->Instance, this, timeout_val, this->Instance->Time());
		this->Instance->Timers->AddTimer(this->Timeout);
	}
	this->state = I_CONNECTING;
	if (this->fd > -1)
	{
		if (!this->Instance->SE->AddFd(this))
		{
			this->OnError(I_ERR_NOMOREFDS);
			this->Close();
			this->state = I_ERROR;
			return false;
		}
		this->SetQueues(this->fd);
	}
	this->Instance->Log(DEBUG,"Returning true from InspSocket::DoConnect");
	return true;
}


void InspSocket::Close()
{
	if (this->fd > -1)
	{
		this->OnClose();
		shutdown(this->fd,2);
		close(this->fd);
	}
}

std::string InspSocket::GetIP()
{
	return this->IP;
}

char* InspSocket::Read()
{
	if ((fd < 0) || (fd > MAX_DESCRIPTORS))
		return NULL;
	int n = recv(this->fd,this->ibuf,sizeof(this->ibuf),0);
	if ((n > 0) && (n <= (int)sizeof(this->ibuf)))
	{
		ibuf[n] = 0;
		return ibuf;
	}
	else
	{
		int err = errno;
		if (err == EAGAIN)
		{
			return "";
		}
		else
		{
			if (!n)
				this->Instance->Log(DEBUG,"EOF or error on socket: EOF");
			else
				this->Instance->Log(DEBUG,"EOF or error on socket: %s",strerror(err));
			return NULL;
		}
	}
}

void InspSocket::MarkAsClosed()
{
	this->Instance->Log(DEBUG,"Marked as closed");
}

// There are two possible outcomes to this function.
// It will either write all of the data, or an undefined amount.
// If an undefined amount is written the connection has failed
// and should be aborted.
int InspSocket::Write(const std::string &data)
{
	/* Try and append the data to the back of the queue, and send it on its way
	 */
	outbuffer.push_back(data);
	this->Instance->SE->WantWrite(this);
	return (!this->FlushWriteBuffer());
}

bool InspSocket::FlushWriteBuffer()
{
	errno = 0;
	if ((this->fd > -1) && (this->state == I_CONNECTED))
	{
		/* If we have multiple lines, try to send them all,
		 * not just the first one -- Brain
		 */
		while (outbuffer.size() && (errno != EAGAIN))
		{
			/* Send a line */
			int result = write(this->fd,outbuffer[0].c_str(),outbuffer[0].length());
			if (result > 0)
			{
				if ((unsigned int)result == outbuffer[0].length())
				{
					/* The whole block was written (usually a line)
					 * Pop the block off the front of the queue,
					 * dont set errno, because we are clear of errors
					 * and want to try and write the next block too.
					 */
					outbuffer.pop_front();
				}
				else
				{
					std::string temp = outbuffer[0].substr(result);
					outbuffer[0] = temp;
					/* We didnt get the whole line out. arses.
					 * Try again next time, i guess. Set errno,
					 * because we shouldnt be writing any more now,
					 * until the socketengine says its safe to do so.
					 */
					errno = EAGAIN;
				}
			}
			else if ((result == -1) && (errno != EAGAIN))
			{
				this->Instance->Log(DEBUG,"Write error on socket: %s",strerror(errno));
				this->OnError(I_ERR_WRITE);
				this->state = I_ERROR;
				this->Instance->SE->DelFd(this);
				this->Close();
				return true;
			}
		}
	}

	if ((errno == EAGAIN) && (fd > -1))
	{
		this->Instance->SE->WantWrite(this);
	}

	return (fd < 0);
}

void SocketTimeout::Tick(time_t now)
{
	if (ServerInstance->SE->GetRef(this->sfd) != this->sock)
	{
		ServerInstance->Log(DEBUG,"Our socket has been deleted before the timeout was reached.");
		return;
	}

	if (this->sock->state == I_CONNECTING)
	{
		ServerInstance->Log(DEBUG,"Timed out, current=%lu",now);
		// for non-listening sockets, the timeout can occur
		// which causes termination of the connection after
		// the given number of seconds without a successful
		// connection.
		this->sock->OnTimeout();
		this->sock->OnError(I_ERR_TIMEOUT);
		this->sock->timeout = true;
		ServerInstance->SE->DelFd(this->sock);
		/* NOTE: We must set this AFTER DelFd, as we added
		 * this socket whilst writeable. This means that we
		 * must DELETE the socket whilst writeable too!
		 */
		this->sock->state = I_ERROR;
		this->sock->Close();
		delete this->sock;
		return;
	}
}

bool InspSocket::Poll()
{
	if (this->Instance->SE->GetRef(this->fd) != this)
		return false;

	int incoming = -1;
	bool n = true;

	if ((fd < 0) || (fd > MAX_DESCRIPTORS))
		return false;

	switch (this->state)
	{
		case I_CONNECTING:
			this->Instance->Log(DEBUG,"State = I_CONNECTING");
			/* Our socket was in write-state, so delete it and re-add it
			 * in read-state.
			 */
			if (this->fd > -1)
			{
				this->Instance->SE->DelFd(this);
				this->SetState(I_CONNECTED);
				if (!this->Instance->SE->AddFd(this))
					return false;
			}
			return this->OnConnected();
		break;
		case I_LISTENING:
			length = sizeof (client);
			incoming = accept (this->fd, (sockaddr*)&client,&length);
			this->SetQueues(incoming);
#ifdef IPV6
			this->OnIncomingConnection(incoming,(char*)insp_ntoa(client.sin6_addr));
#else
			this->OnIncomingConnection(incoming,(char*)insp_ntoa(client.sin_addr));
#endif
			return true;
		break;
		case I_CONNECTED:

			if (this->WaitingForWriteEvent)
			{
				/* Switch back to read events */
				this->Instance->SE->DelFd(this);
				this->WaitingForWriteEvent = false;
				if (!this->Instance->SE->AddFd(this))
					return false;

				/* Trigger the write event */
				n = this->OnWriteReady();
			}
			else
			{
				/* Process the read event */
				n = this->OnDataReady();
			}
			return n;
		break;
		default:
		break;
	}
	return true;
}

void InspSocket::SetState(InspSocketState s)
{
	this->Instance->Log(DEBUG,"Socket state change");
	this->state = s;
}

InspSocketState InspSocket::GetState()
{
	return this->state;
}

int InspSocket::GetFd()
{
	return this->fd;
}

bool InspSocket::OnConnected() { return true; }
void InspSocket::OnError(InspSocketError e) { return; }
int InspSocket::OnDisconnect() { return 0; }
int InspSocket::OnIncomingConnection(int newfd, char* ip) { return 0; }
bool InspSocket::OnDataReady() { return true; }
bool InspSocket::OnWriteReady() { return true; }
void InspSocket::OnTimeout() { return; }
void InspSocket::OnClose() { return; }

InspSocket::~InspSocket()
{
	this->Close();
}

void InspSocket::HandleEvent(EventType et)
{
	switch (et)
	{
		case EVENT_READ:
			if (!this->Poll())
			{
				this->Instance->SE->DelFd(this);
				this->Close();
				delete this;
				return;
			}
		break;
		case EVENT_WRITE:
			if (this->state == I_CONNECTING)
			{
				this->HandleEvent(EVENT_READ);
				return;
			}
			else
			{
				if (this->FlushWriteBuffer())
				{
					this->Instance->SE->DelFd(this);
					this->Close();
					delete this;
					return;
				}
			}
		break;
	}
}