[ViewVC] Diff of: cvs/deliantra/server/socket/lowlevel.C

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.22 by root, Fri Dec 15 19:59:20 2006 UTC vs.
Revision 1.41 by root, Fri May 18 19:46:22 2007 UTC

…		…
1	/*	1	/*
2	CrossFire, A Multiplayer game for X-windows	2	* CrossFire, A Multiplayer game
3		3	*
		4	* Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team
4	Copyright (C) 1992 Frank Tore Johansen	5	* Copyright (C) 1992 Frank Tore Johansen
5		6	*
6	This program is free software; you can redistribute it and/or modify	7	* This program is free software; you can redistribute it and/or modify
7	it under the terms of the GNU General Public License as published by	8	* it under the terms of the GNU General Public License as published by
8	the Free Software Foundation; either version 2 of the License, or	9	* the Free Software Foundation; either version 2 of the License, or
9	(at your option) any later version.	10	* (at your option) any later version.
10		11	*
11	This program is distributed in the hope that it will be useful,	12	* This program is distributed in the hope that it will be useful,
12	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	GNU General Public License for more details.	15	* GNU General Public License for more details.
15		16	*
16	You should have received a copy of the GNU General Public License	17	* You should have received a copy of the GNU General Public License
17	along with this program; if not, write to the Free Software	18	* along with this program; if not, write to the Free Software
18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.	19	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19		20	*
20	The author can be reached via e-mail to mark@pyramid.com	21	* The author can be reached via e-mail to mark@pyramid.com
21	*/	22	*/
22		23
23	/**	24	/**
24	* \file	25	* \file
25	* Low-level socket-related functions.	26	* Low-level socket-related functions.
26	*	27	*
27	* \date 2003-12-02	28	* \date 2003-12-02
40		41
41	#ifdef __linux__	42	#ifdef __linux__
42	# include <sys/types.h>	43	# include <sys/types.h>
43	# include <sys/socket.h>	44	# include <sys/socket.h>
44	# include <netinet/in.h>	45	# include <netinet/in.h>
45	# define TCP_HZ 1000 // sorry...
46	# include <netinet/tcp.h>	46	# include <netinet/tcp.h>
47	#endif	47	#endif
48		48
49	// use a really low timeout, as it doesn't cost any bandwidth, and you can	49	// use a really low timeout, as it doesn't cost any bandwidth, and you can
50	// easily die in 20 seconds...	50	// easily die in 20 seconds...
51	#define SOCKET_TIMEOUT1 10	51	#define SOCKET_TIMEOUT1 10 * 1000
52	#define SOCKET_TIMEOUT2 20	52	#define SOCKET_TIMEOUT2 20 * 1000
53		53
54	void	54	void
55	client::flush ()	55	client::flush ()
56	{	56	{
		57	if (destroyed ())
		58	return;
		59
57	#ifdef __linux__	60	#ifdef __linux__
58	// check time of last ack, and, if too old, kill connection	61	// check time of last ack, and, if too old, kill connection
59	struct tcp_info tcpi;	62	struct tcp_info tcpi;
60	socklen_t len = sizeof (tcpi);	63	socklen_t len = sizeof (tcpi);
61		64
…		…
64	unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;	67	unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
65		68
66	rtt = tcpi.tcpi_rtt;	69	rtt = tcpi.tcpi_rtt;
67	rttvar = tcpi.tcpi_rttvar;	70	rttvar = tcpi.tcpi_rttvar;
68		71
69	if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s	72	if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s
70	&& SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s	73	&& SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s
71	{	74	{
72	LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,	75	LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
73	(unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);	76	(unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
74	status = Ns_Dead;	77	destroy ();
75	}	78	}
76	}	79	}
77	#endif	80	#endif
78		81
79	/**	82	/**
…		…
111	#endif	114	#endif
112	}	115	}
113	else if (res == 0)	116	else if (res == 0)
114	{	117	{
115	LOG (llevError, "socket write failed, connection closed.\n");	118	LOG (llevError, "socket write failed, connection closed.\n");
116	status = Ns_Dead;	119	destroy ();
117	return;	120	return;
118	}	121	}
119	else if (errno == EINTR)	122	else if (errno == EINTR)
120	{	123	{
121	// just retry	124	// just retry
…		…
128	return;	131	return;
129	}	132	}
130	else	133	else
131	{	134	{
132	LOG (llevError, "socket write failed: %s\n", strerror (errno));	135	LOG (llevError, "socket write failed: %s\n", strerror (errno));
133	status = Ns_Dead;	136	destroy ();
134	return;	137	return;
135	}	138	}
136	}	139	}
137		140
138	socket_ev.poll (socket_ev.poll () & ~PE_W);	141	socket_ev.poll (socket_ev.poll () & ~PE_W);
139	}	142	}
140		143
		144	/******************************************************************************
		145	*
		146	* Start of read routines.
		147	*
		148	******************************************************************************/
		149
		150	int
		151	client::next_packet ()
		152	{
		153	if (inbuf_len >= 2)
		154	{
		155	int pkt_len = (inbuf [0] << 8) \| inbuf [1];
		156
		157	if (inbuf_len >= 2 + pkt_len)
		158	return 2 + pkt_len;
		159
		160	if (inbuf_len == sizeof (inbuf))
		161	{
		162	send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED);
		163	destroy ();
		164	return -1;
		165	}
		166	}
		167
		168	return 0;
		169	}
		170
		171	void
		172	client::skip_packet (int len)
		173	{
		174	inbuf_len -= len;
		175	memmove (inbuf, inbuf + len, inbuf_len);
		176	}
		177
141	/***********************************************************************	178	/*****************************************************************************
142	*	179	* Start of command dispatch area.
143	* packet functions/utilities	180	* The commands here are protocol commands.
144	*
145	**********************************************************************/	181	****************************************************************************/
146		182
147	packet &packet::operator <<(const data &v)	183	// SocketCommand, PlayingCommand, should not exist with those ugly casts
		184	#define SC(cb) (void )static_cast<void ()(char , int, client )>(cb),
		185	#define PC(cb) (void )static_cast<void ()(char , int, player )>(cb), PF_PLAYER \|
		186
		187	/**
		188	* Dispatch table for the server.
		189	*/
		190	static struct packet_type packets[] = {
		191	{"ncom", PC(NewPlayerCmd) PF_PLAYING \| PF_COMMAND6 },
		192	{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND0 },
		193
		194	{"examine", PC(ExamineCmd) PF_PLAYING },
		195	{"ex", PC(ExCmd) PF_PLAYING },
		196	{"apply", PC(ApplyCmd) PF_PLAYING },
		197	{"lookat", PC(LookAt) PF_PLAYING },
		198	{"lock", PC(LockItem) PF_PLAYING },
		199	{"mark", PC(MarkItem) PF_PLAYING },
		200	{"move", PC(MoveCmd) PF_PLAYING },
		201	{"ext", PC(ExtCmd) 0 }, // CF+
		202	{"mapredraw", PC(MapRedrawCmd) 0 },
		203	{"mapinfo", PC(MapInfoCmd) 0 }, // CF+
		204
		205	{"reply", SC(ReplyCmd) 0 },
		206	{"exti", SC(ExtiCmd) 0 }, // CF+
		207	{"addme", SC(AddMeCmd) 0 },
		208	{"askface", SC(AskFaceCmd) 0 },
		209	{"requestinfo", SC(RequestInfo) 0 },
		210	{"setfacemode", SC(SetFaceMode) 0 },
		211	{"setsound", SC(SetSound) 0 },
		212	{"setup", SC(SetUp) 0 },
		213	{"version", SC(VersionCmd) 0 },
		214	{"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /Added: tchize /
		215	{"toggleextendedtext", SC(ToggleExtendedText) 0 }, /Added: tchize /
		216	{"asksmooth", SC(AskSmooth) 0 }, /Added: tchize (smoothing technologies) /
		217	};
		218
		219	bool
		220	client::may_execute (const packet_type *pkt) const
148	{	221	{
149	if (room () < v.len)	222	return (!(pkt->flags & PF_PLAYER) \|\| pl)
150	reset ();	223	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
		224	}
		225
		226	// HACK: some commands currently should be executed
		227	// even when the player is frozen. this hack detects
		228	// those commands. it should be folded into may_execute,
		229	// but kept seperate to emphasise the hack aspect, i.e.
		230	// do it better, then remove.
		231	static bool
		232	always_immediate (const client ns, const packet_type pkt, const char *data, int len)
		233	{
		234	if (!(pkt->flags & (PF_COMMAND0 \| PF_COMMAND6)))
		235	return false;
		236
		237	if (!ns->pl \|\| !ns->pl->ob \|\| !ns->pl->ob->map)
		238	return false;
		239
		240	if (pkt->flags & PF_COMMAND6)
		241	{
		242	data += 6;
		243	len -= 6;
		244	}
		245
		246	if (len > 4 && !strncmp (data, "say " , 4))
		247	return true;
		248	if (len > 5 && !strncmp (data, "chat ", 5))
		249	return true;
		250
		251	return false;
		252	}
		253
		254	void
		255	client::execute (const packet_type pkt, char data, int datalen)
		256	{
		257	if (may_execute (pkt) \|\| always_immediate (this, pkt, data, datalen))
		258	{
		259	//TODO: only one format
		260	if (pkt->flags & PF_PLAYER)
		261	((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
		262	else
		263	((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
		264	}
151	else	265	else
		266	send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
		267	}
		268
		269	bool
		270	client::handle_packet ()
		271	{
		272	int pkt_len = next_packet ();
		273
		274	if (!pkt_len)
		275	return false;
		276	else if (pkt_len < 0)
		277	{
		278	LOG (llevError, "read error on player %s\n",
		279	pl && pl->ob ? &pl->ob->name : "[anonymous]");
		280	destroy ();
		281	return false;
152	{	282	}
153	if (v.len)	283
		284	inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
		285
		286	/* First, break out beginning word. There are at least
		287	* a few commands that do not have any paremeters. If
		288	* we get such a command, don't worry about trying
		289	* to break it up.
		290	*/
		291	int datalen;
		292	char data = strchr ((char )inbuf + 2, ' ');
		293
		294	if (data)
		295	{
		296	*data++ = 0;
		297	datalen = pkt_len - (data - (char *)inbuf);
		298	}
		299	else
		300	{
		301	data = (char *)inbuf + 2; // better read garbage than segfault
		302	datalen = 0;
		303	}
		304
		305	for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
		306	if (!strcmp ((char *)inbuf + 2, pkt->name))
154	{	307	{
155	memcpy (cur, v.ptr, v.len);	308	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
156	cur += v.len;	309	queue_command (pkt, data, datalen);
		310	else
		311	execute (pkt, data, datalen);
		312
		313	goto next_packet;
157	}	314	}
		315
		316	// If we get here, we didn't find a valid command.
		317	send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
		318	next_packet:
		319	skip_packet (pkt_len);
		320
		321	// input buffer has space again
		322	socket_ev.poll (socket_ev.poll () \| PE_R);
		323
		324	return true;
		325	}
		326
		327	// callback called when socket is either readable or writable
		328	void
		329	client::socket_cb (iow &w, int got)
		330	{
		331	//TODO remove when we have better socket cleanup logic
		332	if (destroyed ())
158	}	333	{
159		334	socket_ev.poll (0);
160	return *this;	335	return;
161	}
162
163	packet &packet::operator <<(const data8 &v)
164	{
165	unsigned int len = min (v.len, 0x00FF);
166	return *this << uint8 (len) << data (v.ptr, len);
167	}
168
169	packet &packet::operator <<(const data16 &v)
170	{
171	unsigned int len = min (v.len, 0xFFFF);
172	return *this << uint16 (len) << data (v.ptr, len);
173	}
174
175	packet &packet::operator <<(const char *v)
176	{
177	return *this << data (v, strlen (v ? v : 0));
178	}
179
180	void
181	packet::printf (const char *format, ...)
182	{
183	int size = room ();
184
185	va_list ap;
186	va_start (ap, format);
187	int len = vsnprintf ((char *)cur, size, format, ap);
188	va_end (ap);
189
190	if (len >= size)
191	return reset ();
192
193	cur += len;
194	}
195
196	/******************************************************************************
197	*
198	* Start of read routines.
199	*
200	******************************************************************************/
201
202	int
203	client::read_packet ()
204	{
205	for (;;)
206	{	336	}
207	if (inbuf_len >= 2)
208	{
209	unsigned int pkt_len = (inbuf [0] << 8) \| inbuf [1];
210		337
211	if (inbuf_len >= 2 + pkt_len)	338	if (got & PE_W)
212	return pkt_len + 2;	339	{
213	}	340	write_outputbuffer ();
		341
		342	if (!outputbuffer.len)
		343	socket_ev.poll (socket_ev.poll () & ~PE_W);
		344	}
		345
		346	if (got & PE_R)
		347	{
		348	//TODO: rate-limit tcp connection in better ways, important
214		349
215	int amount = sizeof (inbuf) - inbuf_len;	350	int amount = sizeof (inbuf) - inbuf_len;
216		351
217	if (amount <= 0)	352	if (!amount)
218	{	353	{
219	LOG (llevError, "packet too large");//TODO	354	// input buffer full
		355	socket_ev.poll (socket_ev.poll () & ~PE_R);
220	return -1;	356	return;
221	}	357	}
222		358
223	amount = read (fd, inbuf + inbuf_len, amount);	359	amount = read (fd, inbuf + inbuf_len, amount);
224		360
225	if (!amount)	361	if (!amount)
226	{	362	{
227	status = Ns_Dead;	363	destroy ();
228	return -1;	364	return;
229	}	365	}
230	else if (amount < 0)	366	else if (amount < 0)
231	{	367	{
232	if (errno != EAGAIN && errno != EINTR)	368	if (errno != EAGAIN && errno != EINTR)
233	{	369	{
234	LOG (llevError, "read error: %s\n", strerror (errno));	370	LOG (llevError, "read error: %s\n", strerror (errno));
		371	destroy ();
235	return -1;	372	return;
236	}	373	}
237		374
238	return 0;	375	// should not be here, normally
		376	}
		377	else
239	}	378	{
240
241	inbuf_len += amount;	379	inbuf_len += amount;
242		380
243	cst_tot.ibytes += amount;	381	cst_tot.ibytes += amount;
244	cst_lst.ibytes += amount;	382	cst_lst.ibytes += amount;
245	}
246	}
247		383
		384	cmd_ev.start ();
		385	}
		386	}
		387	}
		388
		389	// called whenever we have additional commands to process
248	void	390	void
249	client::skip_packet (int len)	391	client::cmd_cb (iw &w)
250	{	392	{
251	inbuf_len -= len;	393	if (handle_packet ())
252	memmove (inbuf, inbuf + len, inbuf_len);	394	w.start ();
		395	else
		396	flush ();
253	}	397	}
254		398
255	/*******************************************************************************	399	/*******************************************************************************
256	*	400	*
257	* Start of write related routines.	401	* Start of write related routines.
…		…
266	*/	410	*/
267	void	411	void
268	client::send (void *buf_, int len)	412	client::send (void *buf_, int len)
269	{	413	{
270	char buf = (char )buf_;	414	char buf = (char )buf_;
271	char *pos = buf;
272	int amt = 0;
273		415
274	if (status == Ns_Dead \|\| !buf)	416	if (destroyed () \|\| !buf)
275	{
276	LOG (llevDebug, "Write_To_Socket called with dead socket\n");
277	return;	417	return;
278	}
279		418
280	if ((len + outputbuffer.len) > SOCKETBUFSIZE)	419	if (len + outputbuffer.len > SOCKETBUFSIZE)
281	{	420	{
282	LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", fd);	421	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
283	status = Ns_Dead;	422	// shutdown the socket, this is safer than destroying it immediately
		423	// as lots of code in the callchain might still access the map etc.
		424	shutdown (fd, SHUT_RDWR);
284	return;	425	return;
285	}	426	}
286		427
287	int avail, end;	428	int avail, end;
288		429
…		…
306	}	447	}
307		448
308	outputbuffer.len += len;	449	outputbuffer.len += len;
309	}	450	}
310		451
311	void
312	client::socket_cb (iow &w, int got)
313	{
314	write_outputbuffer ();
315
316	if (!outputbuffer.len)
317	socket_ev.poll (socket_ev.poll () & ~PE_W);
318	}
319
320	/**	452	/**
321	* Takes a string of data, and writes it out to the socket. A very handy	453	* Takes a string of data, and writes it out to the socket. A very handy
322	* shortcut function.	454	* shortcut function.
323	*/	455	*/
324	void	456	void
325	client::send_packet (packet &sl)	457	client::send_packet (packet &sl)
326	{	458	{
327	if (status == Ns_Dead)	459	if (destroyed ())
328	return;	460	return;
329		461
330	if (sl.length () >= MAXSOCKBUF)	462	if (sl.length () >= MAXSOCKBUF)
331	{	463	{
332	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());	464	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
…		…
358		490
359	void	491	void
360	client::send_packet (const char *buf)	492	client::send_packet (const char *buf)
361	{	493	{
362	send_packet (buf, strlen (buf));	494	send_packet (buf, strlen (buf));
		495	}
		496
		497	void
		498	client::send_packet_printf (const char *format, ...)
		499	{
		500	packet sl;
		501
		502	va_list ap;
		503	va_start (ap, format);
		504	sl.vprintf (format, ap);
		505	va_end (ap);
		506
		507	send_packet (sl);
		508	}
		509
		510	void
		511	client::send_drawinfo (const char *msg, int flags)
		512	{
		513	send_packet_printf ("drawinfo %d %s", flags, msg);
		514	}
		515
		516	void
		517	client::send_msg (int color, const char type, const char msg)
		518	{
		519	if (can_msg)
		520	send_packet_printf ("msg %d %s %s", color, type, msg);
		521	else if (color < 0)
		522	return; // client cannot handle this
		523	else if (strchr (msg, '<') \|\| strchr (msg, '&'))
		524	{
		525	//TODO: should escape/modify to old syntax
		526	send_packet_printf ("drawinfo %d %s", color, msg);
		527	}
		528	else
		529	send_packet_printf ("drawinfo %d %s", color, msg);
		530	}
		531
		532	/***********************************************************************
		533	*
		534	* packet functions/utilities
		535	*
		536	**********************************************************************/
		537
		538	packet::packet (const char *name)
		539	{
		540	reset ();
		541
		542	int len = strlen (name);
		543	memcpy (cur, name, len); cur += len;
		544	*cur++ = ' ';
		545	}
		546
		547	packet &packet::operator <<(const ber32 v)
		548	{
		549	enum { maxlen = 32 / 7 + 1};
		550	uint8 buf[maxlen];
		551	uint8 *p = buf + maxlen;
		552	uint32 val = v.val;
		553
		554	*--p = val & 0x7F;
		555
		556	while (val > 0x7F)
		557	{
		558	val >>= 7;
		559	*--p = (val & 0x7F) \| 0x80;
		560	}
		561
		562	return *this << data (p, buf + maxlen - p);
		563	}
		564
		565	packet &packet::operator <<(const data &v)
		566	{
		567	if (room () < v.len)
		568	reset ();
		569	else
		570	{
		571	if (v.len)
		572	{
		573	memcpy (cur, v.ptr, v.len);
		574	cur += v.len;
		575	}
		576	}
		577
		578	return *this;
		579	}
		580
		581	packet &packet::operator <<(const data8 &v)
		582	{
		583	unsigned int len = min (v.len, 0x00FF);
		584	return *this << uint8 (len) << data (v.ptr, len);
		585	}
		586
		587	packet &packet::operator <<(const data16 &v)
		588	{
		589	unsigned int len = min (v.len, 0xFFFF);
		590	return *this << uint16 (len) << data (v.ptr, len);
		591	}
		592
		593	packet &packet::operator <<(const char *v)
		594	{
		595	return *this << data (v, strlen (v ? v : 0));
		596	}
		597
		598	void
		599	packet::vprintf (const char *format, va_list ap)
		600	{
		601	int size = room ();
		602
		603	int len = vsnprintf ((char *)cur, size, format, ap);
		604
		605	if (len >= size)
		606	return reset ();
		607
		608	cur += len;
363	}	609	}
364		610
365	/******************************************************************************	611	/******************************************************************************
366	*	612	*
367	* statistics logging functions.	613	* statistics logging functions.

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Comparing deliantra/server/socket/lowlevel.C (file contents): Revision 1.22 by root, Fri Dec 15 19:59:20 2006 UTC vs. Revision 1.41 by root, Fri May 18 19:46:22 2007 UTC

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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.22 by root, Fri Dec 15 19:59:20 2006 UTC vs.
Revision 1.41 by root, Fri May 18 19:46:22 2007 UTC