File: connection.c

package info (click to toggle)
atheme-services 7.2.9-3
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 13,992 kB
  • sloc: ansic: 93,230; sh: 7,440; php: 5,032; perl: 3,327; makefile: 1,261; sed: 16; ruby: 15; python: 3
file content (706 lines) | stat: -rw-r--r-- 16,385 bytes parent folder | download | duplicates (2)
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
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
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
698
699
700
701
702
703
704
705
706
/*
 * atheme-services: A collection of minimalist IRC services
 * connection.c: Connection and I/O management
 *
 * Copyright (c) 2005-2007 Atheme Project (http://www.atheme.org)
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "atheme.h"
#include "internal.h"
#include "datastream.h"

mowgli_list_t connection_list;

#ifdef MOWGLI_OS_WIN
# define EWOULDBLOCK WSAEWOULDBLOCK
# define EINPROGRESS WSAEINPROGRESS
# define SHUT_RDWR   SD_BOTH
#endif

static int socket_setnonblocking(mowgli_descriptor_t sck)
{
#ifndef MOWGLI_OS_WIN
	int flags;

	slog(LG_DEBUG, "socket_setnonblocking(): setting file descriptor %d as non-blocking", sck);

	flags = fcntl(sck, F_GETFL, 0);
	flags |= O_NONBLOCK;

	if (fcntl(sck, F_SETFL, flags))
		return -1;

	return 0;
#else
	u_long yes = 1;

	ioctlsocket(sck, FIONBIO, &yes);
#endif
}

/*
 * connection_trampoline()
 *
 * inputs:
 *       mowgli.eventloop object
 *       mowgli.eventloop.pollable object
 *       poll direction
 *       user-specified data
 *
 * outputs:
 *       none
 *
 * side effects:
 *       whatever happens from the connection_t i/o handlers
 */
static void connection_trampoline(mowgli_eventloop_t *eventloop, mowgli_eventloop_io_t *io,
	mowgli_eventloop_io_dir_t dir, void *userdata)
{
	connection_t *cptr = userdata;

	switch (dir) {
	case MOWGLI_EVENTLOOP_IO_READ:
		return cptr->read_handler(cptr);
		break;
	case MOWGLI_EVENTLOOP_IO_WRITE:
	default:
		return cptr->write_handler(cptr);
		break;
	}
}

/*
 * connection_add()
 *
 * inputs:
 *       connection name, file descriptor, flag bitmask,
 *       read handler, write handler.
 *
 * outputs:
 *       a connection object for the connection information given.
 *
 * side effects:
 *       a connection is added to the socket queue.
 */
connection_t *connection_add(const char *name, int fd, unsigned int flags,
	void (*read_handler)(connection_t *),
	void (*write_handler)(connection_t *))
{
	connection_t *cptr;

	if ((cptr = connection_find(fd)))
	{
		slog(LG_DEBUG, "connection_add(): connection %d is already registered as %s",
				fd, cptr->name);
		return NULL;
	}

	slog(LG_DEBUG, "connection_add(): adding connection '%s', fd=%d", name, fd);

	cptr = smalloc(sizeof(connection_t));

	cptr->fd = fd;
	cptr->pollslot = -1;
	cptr->flags = flags;
	cptr->first_recv = CURRTIME;
	cptr->last_recv = CURRTIME;

	cptr->pollable = mowgli_pollable_create(base_eventloop, cptr->fd, cptr);

	connection_setselect_read(cptr, read_handler);
	connection_setselect_write(cptr, write_handler);

	/* set connection name */
	mowgli_strlcpy(cptr->name, name, HOSTLEN);

	if (cptr->fd > -1)
	{
#ifndef MOWGLI_OS_WIN
		cptr->saddr_size = sizeof(cptr->saddr);
		getpeername(cptr->fd, &cptr->saddr.sa, &cptr->saddr_size);

		inet_ntop(cptr->saddr.sa.sa_family,
			  &cptr->saddr.sin6.sin6_addr,
			  cptr->hbuf, BUFSIZE);
#endif

		socket_setnonblocking(cptr->fd);
	}

	mowgli_node_add(cptr, mowgli_node_create(), &connection_list);

	return cptr;
}

/*
 * connection_find()
 *
 * inputs:
 *       the file descriptor to search by
 *
 * outputs:
 *       the connection_t object associated with that fd
 *
 * side effects:
 *       none
 */
connection_t *connection_find(int fd)
{
	connection_t *cptr;
	mowgli_node_t *nptr;

	MOWGLI_ITER_FOREACH(nptr, connection_list.head)
	{
		cptr = nptr->data;

		if (cptr->fd == fd)
			return cptr;
	}

	return NULL;
}

/*
 * connection_close()
 *
 * inputs:
 *       the connection being closed.
 *
 * outputs:
 *       none
 *
 * side effects:
 *       the connection is closed.
 */
void connection_close(connection_t *cptr)
{
	mowgli_node_t *nptr;
	int errno1, errno2;
#ifdef SO_ERROR
	socklen_t len = sizeof(errno2);
#endif

	if (!cptr)
	{
		slog(LG_DEBUG, "connection_close(): no connection to close!");
		return;
	}

	nptr = mowgli_node_find(cptr, &connection_list);
	if (!nptr)
	{
		slog(LG_ERROR, "connection_close(): connection %p is not registered!",
			cptr);
		return;
	}

	errno1 = ioerrno();
#ifdef SO_ERROR
	if (!getsockopt(cptr->fd, SOL_SOCKET, SO_ERROR, (char *) &errno2, (socklen_t *) &len))
	{
		if (errno2 != 0)
			errno1 = errno2;
	}
#endif

	if (errno1)
		slog(cptr->flags & CF_UPLINK ? LG_ERROR : LG_DEBUG,
				"connection_close(): connection %s[%d] closed due to error %d (%s)",
				cptr->name, cptr->fd, errno1, strerror(errno1));

	if (cptr->close_handler)
		cptr->close_handler(cptr);

	/* close the fd */
	mowgli_pollable_destroy(base_eventloop, cptr->pollable);

	shutdown(cptr->fd, SHUT_RDWR);
	close(cptr->fd);

	mowgli_node_delete(nptr, &connection_list);
	mowgli_node_free(nptr);

	sendqrecvq_free(cptr);

	free(cptr);
}

/* This one is only safe for use by connection_close_soon(),
 * it will cause infinite loops otherwise
 */
static void empty_handler(connection_t *cptr)
{
}

/*
 * connection_close_soon()
 *
 * inputs:
 *       the connection being closed.
 *
 * outputs:
 *       none
 *
 * side effects:
 *       the connection is marked to be closed soon
 *       handlers reset
 *       close_handler called
 */
void connection_close_soon(connection_t *cptr)
{
	if (cptr == NULL)
		return;
	cptr->flags |= CF_DEAD;
	/* these two cannot be NULL */
	cptr->read_handler = empty_handler;
	cptr->write_handler = empty_handler;
	cptr->recvq_handler = NULL;
	if (cptr->close_handler)
		cptr->close_handler(cptr);
	cptr->close_handler = NULL;
	cptr->listener = NULL;
}

/*
 * connection_close_soon_children()
 *
 * inputs:
 *       a listener.
 *
 * outputs:
 *       none
 *
 * side effects:
 *       connection_close_soon() called on the connection itself and
 *       for all connections accepted on this listener
 */
void connection_close_soon_children(connection_t *cptr)
{
	mowgli_node_t *n;
	connection_t *cptr2;

	if (cptr == NULL)
		return;

	if (CF_IS_LISTENING(cptr))
	{
		MOWGLI_ITER_FOREACH(n, connection_list.head)
		{
			cptr2 = n->data;
			if (cptr2->listener == cptr)
				connection_close_soon(cptr2);
		}
	}
	connection_close_soon(cptr);
}

/*
 * connection_close_all()
 *
 * inputs:
 *       none
 *
 * outputs:
 *       none
 *
 * side effects:
 *       connection_close() called on all registered connections
 */
void connection_close_all(void)
{
	mowgli_node_t *n, *tn;
	connection_t *cptr;

	MOWGLI_ITER_FOREACH_SAFE(n, tn, connection_list.head)
	{
		cptr = n->data;
		connection_close(cptr);
	}
}

/*
 * connection_close_all_fds()
 *
 * Close all file descriptors of the connection subsystem in a child process.
 *
 * inputs:
 *       none
 *
 * outputs:
 *       none
 *
 * side effects:
 *       file descriptors belonging to all connections are closed
 *       no handlers called
 */
void connection_close_all_fds(void)
{
	mowgli_node_t *n, *tn;
	connection_t *cptr;

	MOWGLI_ITER_FOREACH_SAFE(n, tn, connection_list.head)
	{
		cptr = n->data;
		close(cptr->fd);
	}
}

/*
 * connection_open_tcp()
 *
 * inputs:
 *       hostname to connect to, vhost to use, port,
 *       read handler, write handler
 *
 * outputs:
 *       the connection_t on success, NULL on failure.
 *
 * side effects:
 *       a TCP/IP connection is opened to the host,
 *       and interest is registered in read/write events.
 */
connection_t *connection_open_tcp(char *host, char *vhost, unsigned int port,
	void (*read_handler)(connection_t *),
	void (*write_handler)(connection_t *))
{
	connection_t *cptr;
	char buf[BUFSIZE];
	struct addrinfo *addr = NULL;
	int s, error;
	unsigned int optval;

	snprintf(buf, BUFSIZE, "tcp connection: %s", host);

	/* resolve it */
	if ((error = getaddrinfo(host, NULL, NULL, &addr)))
	{
		slog(LG_ERROR, "connection_open_tcp(): unable to resolve %s: %s", host, gai_strerror(error));
		return NULL;
	}

	/* some getaddrinfo() do this... */
	if (addr->ai_addr == NULL)
	{
		slog(LG_ERROR, "connection_open_tcp(): host %s is not resolveable.", vhost);
		freeaddrinfo(addr);
		return NULL;
	}

	if ((s = socket(addr->ai_family, SOCK_STREAM, 0)) < 0)
	{
		slog(LG_ERROR, "connection_open_tcp(): unable to create socket.");
		freeaddrinfo(addr);
		return NULL;
	}

	/* Has the highest fd gotten any higher yet? */
	if (s > claro_state.maxfd)
		claro_state.maxfd = s;

	if (vhost != NULL)
	{
		struct addrinfo hints, *bind_addr = NULL;

		memset(&hints, 0, sizeof hints);
		hints.ai_family = addr->ai_family;
		hints.ai_socktype = SOCK_STREAM;
		hints.ai_flags = AI_PASSIVE;
		if ((error = getaddrinfo(vhost, NULL, &hints, &bind_addr)))
		{
			slog(LG_ERROR, "connection_open_tcp(): cant resolve vhost %s: %s", vhost, gai_strerror(error));
			close(s);
			freeaddrinfo(addr);
			return NULL;
		}

		/* some getaddrinfo() do this... */
		if (bind_addr->ai_addr == NULL)
		{
			slog(LG_ERROR, "connection_open_tcp(): vhost %s is not resolveable.", vhost);
			close(s);
			freeaddrinfo(addr);
			freeaddrinfo(bind_addr);
			return NULL;
		}

		optval = 1;
		setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&optval, sizeof(optval));

		if (bind(s, bind_addr->ai_addr, bind_addr->ai_addrlen) < 0)
		{
			slog(LG_ERROR, "connection_open_tcp(): unable to bind to vhost %s: %s", vhost, strerror(ioerrno()));
			close(s);
			freeaddrinfo(addr);
			freeaddrinfo(bind_addr);
			return NULL;
		}

		freeaddrinfo(bind_addr);
	}

	socket_setnonblocking(s);

	switch(addr->ai_family)
	{
	case AF_INET:
		((struct sockaddr_in *) addr->ai_addr)->sin_port = htons(port);
		break;
	case AF_INET6:
		((struct sockaddr_in6 *) addr->ai_addr)->sin6_port = htons(port);
		break;
	}

	if ((connect(s, addr->ai_addr, addr->ai_addrlen) == -1) && ioerrno() != EINPROGRESS && ioerrno() != EINTR && ioerrno() != EWOULDBLOCK)
	{
		if (vhost)
			slog(LG_ERROR, "connection_open_tcp(): failed to connect to %s using vhost %s: %d (%s)", host, vhost, ioerrno(), strerror(ioerrno()));
		else
			slog(LG_ERROR, "connection_open_tcp(): failed to connect to %s: %d (%s)", host, ioerrno(), strerror(ioerrno()));
		close(s);
		freeaddrinfo(addr);
		return NULL;
	}

	freeaddrinfo(addr);

	cptr = connection_add(buf, s, CF_CONNECTING, read_handler, write_handler);

	return cptr;
}

/*
 * connection_open_listener_tcp()
 *
 * inputs:
 *       host and port to listen on,
 *       accept handler
 *
 * outputs:
 *       the connection_t on success, NULL on failure.
 *
 * side effects:
 *       a TCP/IP connection is opened to the host,
 *       and interest is registered in read/write events.
 */
connection_t *connection_open_listener_tcp(char *host, unsigned int port,
	void (*read_handler)(connection_t *))
{
	connection_t *cptr;
	char buf[BUFSIZE];
	struct addrinfo *addr;
	int s, error;
	unsigned int optval;

	/* resolve it */
	if ((error = getaddrinfo(host, NULL, NULL, &addr)))
	{
		slog(LG_ERROR, "connection_open_listener_tcp(): unable to resolve %s: %s", host, gai_strerror(error));
		return NULL;
	}

	/* some getaddrinfo() do this... */
	if (addr->ai_addr == NULL)
	{
		slog(LG_ERROR, "connection_open_listener_tcp(): host %s is not resolveable.", host);
		freeaddrinfo(addr);
		return NULL;
	}

	if ((s = socket(addr->ai_family, SOCK_STREAM, 0)) < 0)
	{
		slog(LG_ERROR, "connection_open_listener_tcp(): unable to create socket.");
		freeaddrinfo(addr);
		return NULL;
	}

	/* Has the highest fd gotten any higher yet? */
	if (s > claro_state.maxfd)
		claro_state.maxfd = s;

	snprintf(buf, BUFSIZE, "listener: %s[%d]", host, port);

	optval = 1;
	setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&optval, sizeof(optval));

	switch(addr->ai_family)
	{
	case AF_INET:
		((struct sockaddr_in *) addr->ai_addr)->sin_port = htons(port);
		break;
	case AF_INET6:
		((struct sockaddr_in6 *) addr->ai_addr)->sin6_port = htons(port);
		break;
	}

	if (bind(s, addr->ai_addr, addr->ai_addrlen) < 0)
	{
		close(s);
		slog(LG_ERROR, "connection_open_listener_tcp(): unable to bind listener %s[%d], errno [%d]", host, port,
			ioerrno());
		freeaddrinfo(addr);
		return NULL;
	}

	freeaddrinfo(addr);

	socket_setnonblocking(s);

	/* XXX we need to have some sort of handling for SOMAXCONN */
	if (listen(s, 5) < 0)
	{
		close(s);
		slog(LG_ERROR, "connection_open_listener_tcp(): error: %s", strerror(ioerrno()));
		return NULL;
	}

	cptr = connection_add(buf, s, CF_LISTENING, read_handler, NULL);

	return cptr;
}

/*
 * connection_accept_tcp()
 *
 * inputs:
 *       listener to accept from, read handler, write handler
 *
 * outputs:
 *       the connection_t on success, NULL on failure.
 *
 * side effects:
 *       a TCP/IP connection is accepted from the host,
 *       and interest is registered in read/write events.
 */
connection_t *connection_accept_tcp(connection_t *cptr,
	void (*read_handler)(connection_t *),
	void (*write_handler)(connection_t *))
{
	char buf[BUFSIZE];
	connection_t *newptr;
	int s;

	if (!(s = accept(cptr->fd, NULL, NULL)))
	{
		slog(LG_INFO, "connection_accept_tcp(): accept failed");
		return NULL;
	}

	/* Has the highest fd gotten any higher yet? */
	if (s > claro_state.maxfd)
		claro_state.maxfd = s;

	socket_setnonblocking(s);

	mowgli_strlcpy(buf, "incoming connection", BUFSIZE);
	newptr = connection_add(buf, s, 0, read_handler, write_handler);
	newptr->listener = cptr;
	return newptr;
}

/*
 * connection_setselect_read()
 *
 * inputs:
 *       connection_t to register/deregister interest on,
 *       replacement handler (NULL = no interest)
 *
 * outputs:
 *       none
 *
 * side effects:
 *       the read handler is changed for the connection_t.
 */
void connection_setselect_read(connection_t *cptr,
	void (*read_handler)(connection_t *))
{
	cptr->read_handler = read_handler;
	mowgli_pollable_setselect(base_eventloop, cptr->pollable, MOWGLI_EVENTLOOP_IO_READ, cptr->read_handler != NULL ? connection_trampoline : NULL);
}

/*
 * connection_setselect_write()
 *
 * inputs:
 *       connection_t to register/deregister interest on,
 *       replacement handler (NULL = no interest)
 *
 * outputs:
 *       none
 *
 * side effects:
 *       the write handler is changed for the connection_t.
 */
void connection_setselect_write(connection_t *cptr,
	void (*write_handler)(connection_t *))
{
	cptr->write_handler = write_handler;
	mowgli_pollable_setselect(base_eventloop, cptr->pollable, MOWGLI_EVENTLOOP_IO_WRITE, cptr->write_handler != NULL ? connection_trampoline : NULL);
}

/*
 * connection_stats()
 *
 * inputs:
 *       callback function, data for callback function
 *
 * outputs:
 *       none
 *
 * side effects:
 *       callback function is called with a series of lines
 */
void connection_stats(void (*stats_cb)(const char *, void *), void *privdata)
{
	mowgli_node_t *n;
	char buf[160];
	char buf2[20];

	MOWGLI_ITER_FOREACH(n, connection_list.head)
	{
		connection_t *c = (connection_t *) n->data;

		snprintf(buf, sizeof buf, "fd %-3d desc '%s'", c->fd, c->name);
		if (c->listener != NULL)
		{
			snprintf(buf2, sizeof buf2, " listener %d", c->listener->fd);
			mowgli_strlcat(buf, buf2, sizeof buf);
		}
		if (c->flags & (CF_CONNECTING | CF_DEAD | CF_NONEWLINE | CF_SEND_EOF | CF_SEND_DEAD))
		{
			mowgli_strlcat(buf, " status", sizeof buf);
			if (c->flags & CF_CONNECTING)
				mowgli_strlcat(buf, " connecting", sizeof buf);
			if (c->flags & CF_DEAD)
				mowgli_strlcat(buf, " dead", sizeof buf);
			if (c->flags & CF_NONEWLINE)
				mowgli_strlcat(buf, " nonewline", sizeof buf);
			if (c->flags & CF_SEND_DEAD)
				mowgli_strlcat(buf, " send_dead", sizeof buf);
			else if (c->flags & CF_SEND_EOF)
				mowgli_strlcat(buf, " send_eof", sizeof buf);
		}
		stats_cb(buf, privdata);
	}
}

/* vim:cinoptions=>s,e0,n0,f0,{0,}0,^0,=s,ps,t0,c3,+s,(2s,us,)20,*30,gs,hs
 * vim:ts=8
 * vim:sw=8
 * vim:noexpandtab
 */