[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 1.60 by root, Mon Oct 1 01:09:10 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	// force a packet when idle for more than this many seconds,
50	// easily die in 20 seconds...	37	// forcing an ack regularly.
51	#define SOCKET_TIMEOUT1 10	38	#define IDLE_PING 2.
52	#define SOCKET_TIMEOUT2 20
53		39
54	void	40	void
55	client::flush ()	41	client::flush ()
56	{	42	{
57	#ifdef __linux__	43	if (destroyed ())
58	// check time of last ack, and, if too old, kill connection	44	return;
59	struct tcp_info tcpi;
60	socklen_t len = sizeof (tcpi);
61
62	if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
63	{
64	unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
65
66	rtt = tcpi.tcpi_rtt;
67	rttvar = tcpi.tcpi_rttvar;
68
69	if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s
70	&& SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s
71	{
72	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);
74	destroy ();
75	}
76	}
77	#endif
78		45
79	/**	46	/**
80	* Writes data to socket.	47	* Writes data to socket.
81	*	48	*
82	* When the socket is clear to write, and we have backlogged data, this	49	* When the socket is clear to write, and we have backlogged data, this
83	* is called to write it out.	50	* is called to write it out.
84	*/	51	*/
85		52
86	if (!outputbuffer.len \|\| socket_ev.poll () & PE_W)	53	// write a nop to the socket at least every IDLE_NOP seconds.
		54	if (!outputbuffer.len)
		55	{
		56	if (last_send + IDLE_PING <= NOW && pl && pl->active)
		57	{
		58	// this is a bit ugly, but map1/map1a seem to be the only
		59	// nop'able commands and they are quite small.
		60	packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
		61	send_packet (sl);
		62	}
		63	else
		64	return;
		65	}
		66
		67	if (socket_ev.poll () & PE_W)
87	return;	68	return;
88		69
		70	last_send = NOW;
89	write_outputbuffer ();	71	write_outputbuffer ();
90	}	72	}
91		73
92	void	74	void
93	client::write_outputbuffer ()	75	client::write_outputbuffer ()
103	/* wrap back to start of buffer */	85	/* wrap back to start of buffer */
104	if (outputbuffer.start == SOCKETBUFSIZE)	86	if (outputbuffer.start == SOCKETBUFSIZE)
105	outputbuffer.start = 0;	87	outputbuffer.start = 0;
106		88
107	outputbuffer.len -= res;	89	outputbuffer.len -= res;
108	#ifdef CS_LOGSTATS
109	cst_tot.obytes += res;
110	cst_lst.obytes += res;
111	#endif
112	}	90	}
113	else if (res == 0)	91	else if (res == 0)
114	{	92	{
115	LOG (llevError, "socket write failed, connection closed.\n");	93	LOG (llevError, "socket write failed, connection closed.\n");
116	destroy ();	94	destroy ();
…		…
154	if (inbuf_len >= 2 + pkt_len)	132	if (inbuf_len >= 2 + pkt_len)
155	return 2 + pkt_len;	133	return 2 + pkt_len;
156		134
157	if (inbuf_len == sizeof (inbuf))	135	if (inbuf_len == sizeof (inbuf))
158	{	136	{
159	send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED);	137	send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED \| NDI_REPLY);
160	destroy ();	138	destroy ();
161	return -1;	139	return -1;
162	}	140	}
163	}	141	}
164		142
…		…
183		161
184	/**	162	/**
185	* Dispatch table for the server.	163	* Dispatch table for the server.
186	*/	164	*/
187	static struct packet_type packets[] = {	165	static struct packet_type packets[] = {
188	{"ncom", PC(NewPlayerCmd) PF_PLAYING },	166	{"ncom", PC(NewPlayerCmd) PF_PLAYING \| PF_COMMAND6 },
189	{"command", PC(PlayerCmd) PF_PLAYING },	167	{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND0 },
190		168
191	{"examine", PC(ExamineCmd) PF_PLAYING },	169	{"examine", PC(ExamineCmd) PF_PLAYING },
		170	{"ex", PC(ExCmd) PF_PLAYING },
192	{"apply", PC(ApplyCmd) PF_PLAYING },	171	{"apply", PC(ApplyCmd) PF_PLAYING },
193	{"reply", PC(ReplyCmd) PF_IMMEDIATE },
194	{"lookat", PC(LookAt) PF_PLAYING },	172	{"lookat", PC(LookAt) PF_PLAYING },
195	{"lock", PC(LockItem) PF_PLAYING },	173	{"lock", PC(LockItem) PF_PLAYING },
196	{"mark", PC(MarkItem) PF_PLAYING },	174	{"mark", PC(MarkItem) PF_PLAYING },
197	{"move", PC(MoveCmd) PF_PLAYING },	175	{"move", PC(MoveCmd) PF_PLAYING },
198	{"exti", PC(ExtCmd) PF_IMMEDIATE }, /* CF+ */
199	{"ext", PC(ExtCmd) 0 }, /* CF+ */	176	{"ext", PC(ExtCmd) 0 }, // CF+
200	{"mapredraw", PC(MapRedrawCmd) PF_IMMEDIATE }, /* Added: phil */	177	{"mapredraw", PC(MapRedrawCmd) 0 },
201	{"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */	178	{"mapinfo", PC(MapInfoCmd) 0 }, // CF+
202		179
		180	{"reply", SC(ReplyCmd) 0 },
		181	{"exti", SC(ExtiCmd) 0 }, // CF+
203	{"addme", SC(AddMeCmd) PF_IMMEDIATE },	182	{"addme", SC(AddMeCmd) 0 },
204	{"askface", SC(SendFaceCmd) PF_IMMEDIATE }, /* Added: phil */	183	{"askface", SC(AskFaceCmd) 0 },
205	{"requestinfo", SC(RequestInfo) PF_IMMEDIATE },	184	{"requestinfo", SC(RequestInfo) 0 },
206	{"setfacemode", SC(SetFaceMode) PF_IMMEDIATE },	185	{"setfacemode", SC(SetFaceMode) 0 },
207	{"setsound", SC(SetSound) PF_IMMEDIATE },	186	{"setsound", SC(SetSound) 0 },
208	{"setup", SC(SetUp) PF_IMMEDIATE },	187	{"setup", SC(SetUp) 0 },
209	{"version", SC(VersionCmd) PF_IMMEDIATE },	188	{"version", SC(VersionCmd) 0 },
210	{"toggleextendedinfos", SC(ToggleExtendedInfos) PF_IMMEDIATE }, /Added: tchize /	189	{"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /Added: tchize /
211	{"toggleextendedtext", SC(ToggleExtendedText) PF_IMMEDIATE }, /Added: tchize /	190	{"toggleextendedtext", SC(ToggleExtendedText) 0 }, /Added: tchize /
212	{"asksmooth", SC(AskSmooth) PF_IMMEDIATE }, /Added: tchize (smoothing technologies) /	191	{"asksmooth", SC(AskSmooth) 0 }, /Added: tchize (smoothing technologies) /
213	};	192	};
214		193
215	bool	194	bool
216	client::may_execute (const packet_type *pkt) const	195	client::may_execute (const packet_type *pkt) const
217	{	196	{
218	return (!(pkt->flags & PF_PLAYER) \|\| pl)	197	return (!(pkt->flags & PF_PLAYER) \|\| pl)
219	&& (!(pkt->flags & PF_PLAYING) \|\| (pl && pl->state == ST_PLAYING));	198	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
		199	}
		200
		201	// HACK: some commands currently should be executed
		202	// even when the player is frozen. this hack detects
		203	// those commands. it should be folded into may_execute,
		204	// but kept seperate to emphasise the hack aspect, i.e.
		205	// do it better, then remove.
		206	static bool
		207	always_immediate (const client ns, const packet_type pkt, const char *data, int len)
		208	{
		209	if (!(pkt->flags & (PF_COMMAND0 \| PF_COMMAND6)))
		210	return false;
		211
		212	if (!ns->pl \|\| !ns->pl->ob \|\| !ns->pl->ob->map)
		213	return false;
		214
		215	if (pkt->flags & PF_COMMAND6)
		216	{
		217	data += 6;
		218	len -= 6;
		219	}
		220
		221	if (len > 4 && !strncmp (data, "say " , 4))
		222	return true;
		223	if (len > 5 && !strncmp (data, "chat ", 5))
		224	return true;
		225
		226	return false;
220	}	227	}
221		228
222	void	229	void
223	client::execute (const packet_type pkt, char data, int datalen)	230	client::execute (const packet_type pkt, char data, int datalen)
224	{	231	{
225	if (may_execute (pkt))	232	if (may_execute (pkt) \|\| always_immediate (this, pkt, data, datalen))
226	{	233	{
227	//TODO: only one format	234	//TODO: only one format
228	if (pkt->flags & PF_PLAYER)	235	if (pkt->flags & PF_PLAYER)
229	((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);	236	((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
230	else	237	else
231	((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);	238	((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
232	}	239	}
233	else	240	else
234	send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);	241	send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED \| NDI_REPLY, pkt->name);
235	}	242	}
236		243
237	bool	244	bool
238	client::handle_packet ()	245	client::handle_packet ()
239	{	246	{
…		…
271	}	278	}
272		279
273	for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)	280	for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
274	if (!strcmp ((char *)inbuf + 2, pkt->name))	281	if (!strcmp ((char *)inbuf + 2, pkt->name))
275	{	282	{
276	if (pkt->flags & PF_IMMEDIATE)	283	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
		284	queue_command (pkt, data, datalen);
		285	else
277	execute (pkt, data, datalen);	286	execute (pkt, data, datalen);
278	else
279	queue_command (pkt, data, datalen);
280		287
281	goto next_packet;	288	goto next_packet;
282	}	289	}
283		290
284	/* If we get here, we didn't find a valid command. Logging	291	// 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);	292	send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED \| NDI_REPLY, (char *)inbuf + 2);
289	next_packet:	293	next_packet:
290	skip_packet (pkt_len);	294	skip_packet (pkt_len);
291		295
292	// input buffer has space again	296	// input buffer has space again
293	socket_ev.poll (socket_ev.poll () \| PE_R);	297	socket_ev.poll (socket_ev.poll () \| PE_R);
…		…
298	// callback called when socket is either readable or writable	302	// callback called when socket is either readable or writable
299	void	303	void
300	client::socket_cb (iow &w, int got)	304	client::socket_cb (iow &w, int got)
301	{	305	{
302	//TODO remove when we have better socket cleanup logic	306	//TODO remove when we have better socket cleanup logic
303	if (status == Ns_Dead)	307	if (destroyed ())
304	{	308	{
305	socket_ev.poll (0);	309	socket_ev.poll (0);
306	return;	310	return;
307	}	311	}
308		312
…		…
347	}	351	}
348	else	352	else
349	{	353	{
350	inbuf_len += amount;	354	inbuf_len += amount;
351		355
352	cst_tot.ibytes += amount;	356	if (handle_packet ())
353	cst_lst.ibytes += amount;	357	{
		358	while (handle_packet ())
		359	;
354		360
355	cmd_ev.start ();	361	flush ();
356	}	362	}
		363	}
357	}	364	}
358	}
359
360	// called whenever we have additional commands to process
361	void
362	client::cmd_cb (iw &w)
363	{
364	if (handle_packet () \|\| handle_command ())
365	w.start ();
366	else
367	flush ();
368	}	365	}
369		366
370	/*******************************************************************************	367	/*******************************************************************************
371	*	368	*
372	* Start of write related routines.	369	* Start of write related routines.
…		…
381	*/	378	*/
382	void	379	void
383	client::send (void *buf_, int len)	380	client::send (void *buf_, int len)
384	{	381	{
385	char buf = (char )buf_;	382	char buf = (char )buf_;
386	char *pos = buf;
387	int amt = 0;
388		383
389	if (status == Ns_Dead \|\| !buf)	384	if (destroyed () \|\| !buf)
390	return;	385	return;
391		386
392	if ((len + outputbuffer.len) > SOCKETBUFSIZE)	387	if (len + outputbuffer.len > SOCKETBUFSIZE)
393	{	388	{
394	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);	389	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
395	destroy ();	390	// shutdown the socket, this is safer than destroying it immediately
		391	// as lots of code in the callchain might still access the map etc.
		392	shutdown (fd, SHUT_RDWR);
396	return;	393	return;
397	}	394	}
398		395
399	int avail, end;	396	int avail, end;
400		397
…		…
425	* shortcut function.	422	* shortcut function.
426	*/	423	*/
427	void	424	void
428	client::send_packet (packet &sl)	425	client::send_packet (packet &sl)
429	{	426	{
430	if (status == Ns_Dead)	427	if (destroyed ())
431	return;	428	return;
432		429
433	if (sl.length () >= MAXSOCKBUF)	430	if (sl.length () > MAXSOCKBUF)
434	{	431	{
435	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());	432	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
436	/* Almost certainly we've overflowed a buffer, so quit now to make	433	/* Almost certainly we've overflowed a buffer, so quit now to make
437	* it easier to debug.	434	* it easier to debug.
438	*/	435	*/
…		…
476	va_end (ap);	473	va_end (ap);
477		474
478	send_packet (sl);	475	send_packet (sl);
479	}	476	}
480		477
		478	// returns true when the message needs special (read: perl) treatment
		479	static bool
		480	msg_is_special (const char *msg)
		481	{
		482	return msg [strcspn (msg, "<[&\n")];
		483	}
		484
		485	void
		486	client::send_msg (int color, const char type, const char msg)
		487	{
		488	if (!msg \|\| !type) // it can happen (for example, missing attack messages cause this)
		489	{
		490	LOG (logBacktrace \| llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
		491	return;
		492	}
		493
		494	int len = strlen (msg);
		495
		496	if (msg_is_special (msg) \|\| (type [0] == 'c' && type [1] == '/') \|\| len > (MAXSOCKBUF - 128))
		497	cfperl_send_msg (this, color, type, msg);
		498	else if (can_msg)
		499	send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
		500	else if (color < 0)
		501	return; // client cannot handle this
		502	else
		503	send_packet_printf ("drawinfo %d %s", color & NDI_COLOR_MASK, msg);
		504	}
		505
		506	void
		507	client::send_drawinfo (const char *msg, int flags)
		508	{
		509	send_msg (flags, "log", msg);
		510	}
		511
481	/***********************************************************************	512	/***********************************************************************
482	*	513	*
483	* packet functions/utilities	514	* packet functions/utilities
484	*	515	*
485	**********************************************************************/	516	**********************************************************************/
		517
		518	packet::packet (const char *name)
		519	{
		520	reset ();
		521
		522	int len = strlen (name);
		523	memcpy (cur, name, len); cur += len;
		524	*cur++ = ' ';
		525	}
		526
		527	packet &packet::operator <<(const ber32 v)
		528	{
		529	enum { maxlen = 32 / 7 + 1};
		530	uint8 buf[maxlen];
		531	uint8 *p = buf + maxlen;
		532	uint32 val = v.val;
		533
		534	*--p = val & 0x7F;
		535
		536	while (val > 0x7F)
		537	{
		538	val >>= 7;
		539	*--p = (val & 0x7F) \| 0x80;
		540	}
		541
		542	return *this << data (p, buf + maxlen - p);
		543	}
486		544
487	packet &packet::operator <<(const data &v)	545	packet &packet::operator <<(const data &v)
488	{	546	{
489	if (room () < v.len)	547	if (room () < v.len)
490	reset ();	548	reset ();
…		…
528	return reset ();	586	return reset ();
529		587
530	cur += len;	588	cur += len;
531	}	589	}
532		590
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 1.60 by root, Mon Oct 1 01:09:10 2007 UTC

Diff Legend

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.23 by root, Sat Dec 16 03:08:26 2006 UTC vs.
Revision 1.60 by root, Mon Oct 1 01:09:10 2007 UTC