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

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.23 by root, Sat Dec 16 03:08:26 2006 UTC vs.
Revision 1.51 by root, Sat Jul 28 00:15:03 2007 UTC

…		…
1	/*	1	/*
2	CrossFire, A Multiplayer game for X-windows	2	* This file is part of Crossfire TRT, the Roguelike Realtime MORPG.
3		3	*
		4	* Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team
4	Copyright (C) 1992 Frank Tore Johansen	5	* Copyright (©) 1992,2007 Frank Tore Johansen
5		6	*
6	This program is free software; you can redistribute it and/or modify	7	* Crossfire TRT 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 3 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, see <http://www.gnu.org/licenses/>.
18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19
20	The author can be reached via e-mail to mark@pyramid.com
21	*/
22
23	/**
24	* \file
25	* Low-level socket-related functions.
26	*	19	*
27	* \date 2003-12-02	20	* The authors can be reached via e-mail to <crossfire@schmorp.de>
28	*
29	* Contains some base functions that both the client and server
30	* can use. As such, depending what we are being compiled for will
31	* determine what we can include. the client is designed have
32	* CFCLIENT defined as part of its compile flags.
33	*/	21	*/
34		22
35	using namespace std;	23	using namespace std;
36		24
37	#include <global.h>	25	#include <global.h>
38	#include <sproto.h>	26	#include <sproto.h>
39	#include <cstdarg>	27	#include <cstdarg>
40		28
41	#ifdef __linux__	29	#if HAVE_TCP_INFO
42	# include <sys/types.h>	30	# include <sys/types.h>
43	# include <sys/socket.h>	31	# include <sys/socket.h>
44	# include <netinet/in.h>	32	# include <netinet/in.h>
45	# define TCP_HZ 1000 // sorry...
46	# include <netinet/tcp.h>	33	# include <netinet/tcp.h>
47	#endif	34	#endif
48		35
49	// use a really low timeout, as it doesn't cost any bandwidth, and you can	36	// disconnect a socket after this many seconds without an ack
50	// easily die in 20 seconds...
51	#define SOCKET_TIMEOUT1 10	37	#define SOCKET_TIMEOUT 8.
52	#define SOCKET_TIMEOUT2 20	38
		39	// force a packet when idle for more than this many seconds,
		40	// forcing an ack regularly.
		41	#define IDLE_PING 2.
53		42
54	void	43	void
55	client::flush ()	44	client::flush ()
56	{	45	{
57	#ifdef __linux__	46	if (destroyed ())
		47	return;
		48
		49	#if HAVE_TCP_INFO
		50	// check about once per second, spread evenly over all clients
		51	// do this only when player is active
		52	if (!((pticks + fd) & 7) && pl && pl->active)
		53	{
58	// check time of last ack, and, if too old, kill connection	54	// check time of last ack, and, if too old, kill connection
59	struct tcp_info tcpi;
60	socklen_t len = sizeof (tcpi);	55	socklen_t len = sizeof (tcpi);
61		56
62	if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))	57	if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
63	{	58	{
64	unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;	59	if (tcpi.tcpi_snd_mss)
		60	mss = tcpi.tcpi_snd_mss;
65		61
66	rtt = tcpi.tcpi_rtt;	62	fprintf (stderr, "uack %d sst %d cwnd %d mss %d pmtu %d\n",
67	rttvar = tcpi.tcpi_rttvar;	63	tcpi.tcpi_unacked, tcpi.tcpi_snd_ssthresh, tcpi.tcpi_snd_cwnd, tcpi.tcpi_advmss, tcpi.tcpi_pmtu);
68		64
69	if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s	65	if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
70	&& SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s
71	{	66	{
		67	send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
		68	write_outputbuffer ();
		69
72	LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,	70	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);	71	(unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
74	destroy ();	72	destroy ();
		73	}
75	}	74	}
76	}	75	}
77	#endif	76	#endif
78		77
79	/**	78	/**
81	*	80	*
82	* When the socket is clear to write, and we have backlogged data, this	81	* When the socket is clear to write, and we have backlogged data, this
83	* is called to write it out.	82	* is called to write it out.
84	*/	83	*/
85		84
86	if (!outputbuffer.len \|\| socket_ev.poll () & PE_W)	85	// write a nop to the socket at least every IDLE_NOP seconds.
		86	if (!outputbuffer.len)
		87	{
		88	if (last_send + IDLE_PING <= NOW && pl && pl->active)
		89	{
		90	// this is a bit ugly, but map1/map1a seem to be the only
		91	// nop'able commands and they are quite small.
		92	packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
		93	send_packet (sl);
		94	}
		95	else
		96	return;
		97	}
		98
		99	if (socket_ev.poll () & PE_W)
87	return;	100	return;
88		101
		102	last_send = NOW;
89	write_outputbuffer ();	103	write_outputbuffer ();
90	}	104	}
91		105
92	void	106	void
93	client::write_outputbuffer ()	107	client::write_outputbuffer ()
…		…
103	/* wrap back to start of buffer */	117	/* wrap back to start of buffer */
104	if (outputbuffer.start == SOCKETBUFSIZE)	118	if (outputbuffer.start == SOCKETBUFSIZE)
105	outputbuffer.start = 0;	119	outputbuffer.start = 0;
106		120
107	outputbuffer.len -= res;	121	outputbuffer.len -= res;
108	#ifdef CS_LOGSTATS
109	cst_tot.obytes += res;
110	cst_lst.obytes += res;
111	#endif
112	}	122	}
113	else if (res == 0)	123	else if (res == 0)
114	{	124	{
115	LOG (llevError, "socket write failed, connection closed.\n");	125	LOG (llevError, "socket write failed, connection closed.\n");
116	destroy ();	126	destroy ();
…		…
183		193
184	/**	194	/**
185	* Dispatch table for the server.	195	* Dispatch table for the server.
186	*/	196	*/
187	static struct packet_type packets[] = {	197	static struct packet_type packets[] = {
188	{"ncom", PC(NewPlayerCmd) PF_PLAYING },	198	{"ncom", PC(NewPlayerCmd) PF_PLAYING \| PF_COMMAND6 },
189	{"command", PC(PlayerCmd) PF_PLAYING },	199	{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND0 },
190		200
191	{"examine", PC(ExamineCmd) PF_PLAYING },	201	{"examine", PC(ExamineCmd) PF_PLAYING },
		202	{"ex", PC(ExCmd) PF_PLAYING },
192	{"apply", PC(ApplyCmd) PF_PLAYING },	203	{"apply", PC(ApplyCmd) PF_PLAYING },
193	{"reply", PC(ReplyCmd) PF_IMMEDIATE },
194	{"lookat", PC(LookAt) PF_PLAYING },	204	{"lookat", PC(LookAt) PF_PLAYING },
195	{"lock", PC(LockItem) PF_PLAYING },	205	{"lock", PC(LockItem) PF_PLAYING },
196	{"mark", PC(MarkItem) PF_PLAYING },	206	{"mark", PC(MarkItem) PF_PLAYING },
197	{"move", PC(MoveCmd) PF_PLAYING },	207	{"move", PC(MoveCmd) PF_PLAYING },
198	{"exti", PC(ExtCmd) PF_IMMEDIATE }, /* CF+ */
199	{"ext", PC(ExtCmd) 0 }, /* CF+ */	208	{"ext", PC(ExtCmd) 0 }, // CF+
200	{"mapredraw", PC(MapRedrawCmd) PF_IMMEDIATE }, /* Added: phil */	209	{"mapredraw", PC(MapRedrawCmd) 0 },
201	{"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */	210	{"mapinfo", PC(MapInfoCmd) 0 }, // CF+
202		211
		212	{"reply", SC(ReplyCmd) 0 },
		213	{"exti", SC(ExtiCmd) 0 }, // CF+
203	{"addme", SC(AddMeCmd) PF_IMMEDIATE },	214	{"addme", SC(AddMeCmd) 0 },
204	{"askface", SC(SendFaceCmd) PF_IMMEDIATE }, /* Added: phil */	215	{"askface", SC(AskFaceCmd) 0 },
205	{"requestinfo", SC(RequestInfo) PF_IMMEDIATE },	216	{"requestinfo", SC(RequestInfo) 0 },
206	{"setfacemode", SC(SetFaceMode) PF_IMMEDIATE },	217	{"setfacemode", SC(SetFaceMode) 0 },
207	{"setsound", SC(SetSound) PF_IMMEDIATE },	218	{"setsound", SC(SetSound) 0 },
208	{"setup", SC(SetUp) PF_IMMEDIATE },	219	{"setup", SC(SetUp) 0 },
209	{"version", SC(VersionCmd) PF_IMMEDIATE },	220	{"version", SC(VersionCmd) 0 },
210	{"toggleextendedinfos", SC(ToggleExtendedInfos) PF_IMMEDIATE }, /Added: tchize /	221	{"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /Added: tchize /
211	{"toggleextendedtext", SC(ToggleExtendedText) PF_IMMEDIATE }, /Added: tchize /	222	{"toggleextendedtext", SC(ToggleExtendedText) 0 }, /Added: tchize /
212	{"asksmooth", SC(AskSmooth) PF_IMMEDIATE }, /Added: tchize (smoothing technologies) /	223	{"asksmooth", SC(AskSmooth) 0 }, /Added: tchize (smoothing technologies) /
213	};	224	};
214		225
215	bool	226	bool
216	client::may_execute (const packet_type *pkt) const	227	client::may_execute (const packet_type *pkt) const
217	{	228	{
218	return (!(pkt->flags & PF_PLAYER) \|\| pl)	229	return (!(pkt->flags & PF_PLAYER) \|\| pl)
219	&& (!(pkt->flags & PF_PLAYING) \|\| (pl && pl->state == ST_PLAYING));	230	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
		231	}
		232
		233	// HACK: some commands currently should be executed
		234	// even when the player is frozen. this hack detects
		235	// those commands. it should be folded into may_execute,
		236	// but kept seperate to emphasise the hack aspect, i.e.
		237	// do it better, then remove.
		238	static bool
		239	always_immediate (const client ns, const packet_type pkt, const char *data, int len)
		240	{
		241	if (!(pkt->flags & (PF_COMMAND0 \| PF_COMMAND6)))
		242	return false;
		243
		244	if (!ns->pl \|\| !ns->pl->ob \|\| !ns->pl->ob->map)
		245	return false;
		246
		247	if (pkt->flags & PF_COMMAND6)
		248	{
		249	data += 6;
		250	len -= 6;
		251	}
		252
		253	if (len > 4 && !strncmp (data, "say " , 4))
		254	return true;
		255	if (len > 5 && !strncmp (data, "chat ", 5))
		256	return true;
		257
		258	return false;
220	}	259	}
221		260
222	void	261	void
223	client::execute (const packet_type pkt, char data, int datalen)	262	client::execute (const packet_type pkt, char data, int datalen)
224	{	263	{
225	if (may_execute (pkt))	264	if (may_execute (pkt) \|\| always_immediate (this, pkt, data, datalen))
226	{	265	{
227	//TODO: only one format	266	//TODO: only one format
228	if (pkt->flags & PF_PLAYER)	267	if (pkt->flags & PF_PLAYER)
229	((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);	268	((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
230	else	269	else
…		…
271	}	310	}
272		311
273	for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)	312	for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
274	if (!strcmp ((char *)inbuf + 2, pkt->name))	313	if (!strcmp ((char *)inbuf + 2, pkt->name))
275	{	314	{
276	if (pkt->flags & PF_IMMEDIATE)	315	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
		316	queue_command (pkt, data, datalen);
		317	else
277	execute (pkt, data, datalen);	318	execute (pkt, data, datalen);
278	else
279	queue_command (pkt, data, datalen);
280		319
281	goto next_packet;	320	goto next_packet;
282	}	321	}
283		322
284	/* If we get here, we didn't find a valid command. Logging	323	// If we get here, we didn't find a valid command.
285	* this might be questionable, because a broken client/malicious
286	* user could certainly send a whole bunch of invalid commands.
287	*/
288	send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);	324	send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
289	next_packet:	325	next_packet:
290	skip_packet (pkt_len);	326	skip_packet (pkt_len);
291		327
292	// input buffer has space again	328	// input buffer has space again
…		…
298	// callback called when socket is either readable or writable	334	// callback called when socket is either readable or writable
299	void	335	void
300	client::socket_cb (iow &w, int got)	336	client::socket_cb (iow &w, int got)
301	{	337	{
302	//TODO remove when we have better socket cleanup logic	338	//TODO remove when we have better socket cleanup logic
303	if (status == Ns_Dead)	339	if (destroyed ())
304	{	340	{
305	socket_ev.poll (0);	341	socket_ev.poll (0);
306	return;	342	return;
307	}	343	}
308		344
…		…
347	}	383	}
348	else	384	else
349	{	385	{
350	inbuf_len += amount;	386	inbuf_len += amount;
351		387
352	cst_tot.ibytes += amount;
353	cst_lst.ibytes += amount;
354
355	cmd_ev.start ();	388	cmd_ev.start ();
356	}	389	}
357	}	390	}
358	}	391	}
359		392
360	// called whenever we have additional commands to process	393	// called whenever we have additional commands to process
361	void	394	void
362	client::cmd_cb (iw &w)	395	client::cmd_cb (iw &w)
363	{	396	{
364	if (handle_packet () \|\| handle_command ())	397	if (handle_packet ())
365	w.start ();	398	w.start ();
366	else	399	else
367	flush ();	400	flush ();
368	}	401	}
369		402
…		…
381	*/	414	*/
382	void	415	void
383	client::send (void *buf_, int len)	416	client::send (void *buf_, int len)
384	{	417	{
385	char buf = (char )buf_;	418	char buf = (char )buf_;
386	char *pos = buf;
387	int amt = 0;
388		419
389	if (status == Ns_Dead \|\| !buf)	420	if (destroyed () \|\| !buf)
390	return;	421	return;
391		422
392	if ((len + outputbuffer.len) > SOCKETBUFSIZE)	423	if (len + outputbuffer.len > SOCKETBUFSIZE)
393	{	424	{
394	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);	425	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
395	destroy ();	426	// shutdown the socket, this is safer than destroying it immediately
		427	// as lots of code in the callchain might still access the map etc.
		428	shutdown (fd, SHUT_RDWR);
396	return;	429	return;
397	}	430	}
398		431
399	int avail, end;	432	int avail, end;
400		433
…		…
425	* shortcut function.	458	* shortcut function.
426	*/	459	*/
427	void	460	void
428	client::send_packet (packet &sl)	461	client::send_packet (packet &sl)
429	{	462	{
430	if (status == Ns_Dead)	463	if (destroyed ())
431	return;	464	return;
432		465
433	if (sl.length () >= MAXSOCKBUF)	466	if (sl.length () >= MAXSOCKBUF)
434	{	467	{
435	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());	468	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
…		…
476	va_end (ap);	509	va_end (ap);
477		510
478	send_packet (sl);	511	send_packet (sl);
479	}	512	}
480		513
		514	// returns true when the message needs special (read: perl) treatment
		515	static bool
		516	msg_is_special (const char *msg)
		517	{
		518	return msg [strcspn (msg, "<[&\n")];
		519	}
		520
		521	void
		522	client::send_msg (int color, const char type, const char msg)
		523	{
		524	if (msg_is_special (msg))
		525	cfperl_send_msg (this, color, type, msg);
		526	else if (can_msg)
		527	send_packet_printf ("msg %d %s %s", color, type, msg);
		528	else if (color < 0)
		529	return; // client cannot handle this
		530	else
		531	send_packet_printf ("drawinfo %d %s", color, msg);
		532	}
		533
		534	void
		535	client::send_drawinfo (const char *msg, int flags)
		536	{
		537	send_msg (flags, "log", msg);
		538	}
		539
481	/***********************************************************************	540	/***********************************************************************
482	*	541	*
483	* packet functions/utilities	542	* packet functions/utilities
484	*	543	*
485	**********************************************************************/	544	**********************************************************************/
486		545
		546	packet::packet (const char *name)
		547	{
		548	reset ();
		549
		550	int len = strlen (name);
		551	memcpy (cur, name, len); cur += len;
		552	*cur++ = ' ';
		553	}
		554
		555	packet &packet::operator <<(const ber32 v)
		556	{
		557	enum { maxlen = 32 / 7 + 1};
		558	uint8 buf[maxlen];
		559	uint8 *p = buf + maxlen;
		560	uint32 val = v.val;
		561
		562	*--p = val & 0x7F;
		563
		564	while (val > 0x7F)
		565	{
		566	val >>= 7;
		567	*--p = (val & 0x7F) \| 0x80;
		568	}
		569
		570	return *this << data (p, buf + maxlen - p);
		571	}
		572
487	packet &packet::operator <<(const data &v)	573	packet &packet::operator <<(const data &v)
488	{	574	{
489	if (room () < v.len)	575	if (room () < v.len)
490	reset ();	576	reset ();
491	else	577	else
…		…
528	return reset ();	614	return reset ();
529		615
530	cur += len;	616	cur += len;
531	}	617	}
532		618
533	/******************************************************************************
534	*
535	* statistics logging functions.
536	*
537	******************************************************************************/
538
539	#ifdef CS_LOGSTATS
540
541	/* cst_tot is for the life of the server, cst_last is for the last series of
542	* stats
543	*/
544	CS_Stats cst_tot, cst_lst;
545
546	/**
547	* Writes out the gathered stats. We clear cst_lst.
548	*/
549	void
550	write_cs_stats (void)
551	{
552	time_t now = time (NULL);
553
554	/* If no connections recently, don't both to log anything */
555	if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
556	return;
557
558	/* CSSTAT is put in so scripts can easily find the line */
559	LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
560	ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
561	now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
562	cst_lst.ibytes = 0;
563	cst_lst.obytes = 0;
564	cst_lst.time_start = now;
565	}
566	#endif
567

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Comparing deliantra/server/socket/lowlevel.C (file contents): Revision 1.23 by root, Sat Dec 16 03:08:26 2006 UTC vs. Revision 1.51 by root, Sat Jul 28 00:15:03 2007 UTC

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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.23 by root, Sat Dec 16 03:08:26 2006 UTC vs.
Revision 1.51 by root, Sat Jul 28 00:15:03 2007 UTC