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

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.11 by root, Wed Dec 13 21:27:09 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 <newclient.h>
39	#include <sproto.h>	26	#include <sproto.h>
40	#include <cstdarg>	27	#include <cstdarg>
41		28
42	#ifdef __linux__	29	#if HAVE_TCP_INFO
43	# include <sys/types.h>	30	# include <sys/types.h>
44	# include <sys/socket.h>	31	# include <sys/socket.h>
45	# include <netinet/in.h>	32	# include <netinet/in.h>
46	# define TCP_HZ 1000 // sorry...
47	# include <netinet/tcp.h>	33	# include <netinet/tcp.h>
48	#endif	34	#endif
49		35
50	// 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
51	// easily die in 20 seconds...
52	#define SOCKET_TIMEOUT1 10	37	#define SOCKET_TIMEOUT 8.
53	#define SOCKET_TIMEOUT2 20
54		38
		39	// force a packet when idle for more than this many seconds,
		40	// forcing an ack regularly.
		41	#define IDLE_PING 2.
		42
55	void	43	void
56	Socket_Flush (NewSocket * ns)	44	client::flush ()
57	{	45	{
58	#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	{
59	// check time of last ack, and, if too old, kill connection	54	// check time of last ack, and, if too old, kill connection
60	struct tcp_info tcpi;
61	socklen_t len = sizeof (tcpi);	55	socklen_t len = sizeof (tcpi);
62		56
63	if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))	57	if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
64	{	58	{
65	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;
66		61
67	if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s	62	fprintf (stderr, "uack %d sst %d cwnd %d mss %d pmtu %d\n",
68	&& SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s	63	tcpi.tcpi_unacked, tcpi.tcpi_snd_ssthresh, tcpi.tcpi_snd_cwnd, tcpi.tcpi_advmss, tcpi.tcpi_pmtu);
		64
		65	if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
69	{	66	{
		67	send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
		68	write_outputbuffer ();
		69
70	LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd,	70	LOG (llevDebug, "connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
71	(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);
72	ns->status = Ns_Dead;	72	destroy ();
73	}	73	}
		74	}
74	}	75	}
75
76	int val;
77
78	val = 0; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
79	val = 1; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
80	#endif	76	#endif
81	}
82		77
83	/***********************************************************************	78	/**
84	*	79	* Writes data to socket.
85	* SockList functions/utilities	80	*
86	*	81	* When the socket is clear to write, and we have backlogged data, this
87	**********************************************************************/	82	* is called to write it out.
		83	*/
88		84
89	SockList &SockList::operator <<(const data &v)	85	// write a nop to the socket at least every IDLE_NOP seconds.
90	{	86	if (!outputbuffer.len)
91	if (v.len)
92	{
93	memcpy (buf + len, v.ptr, v.len);
94	len += v.len;
95	}	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	}
96		98
97	return *this;	99	if (socket_ev.poll () & PE_W)
98	}	100	return;
99		101
100	SockList &SockList::operator <<(const data8 &v)	102	last_send = NOW;
101	{	103	write_outputbuffer ();
102	unsigned int len = min (v.len, 0x00FF);
103	return *this << uint8 (len) << data (v.ptr, len);
104	}	104	}
105		105
106	SockList &SockList::operator <<(const data16 &v)
107	{
108	unsigned int len = min (v.len, 0xFFFF);
109	return *this << uint16 (len) << data (v.ptr, len);
110	}
111
112	SockList &SockList::operator <<(const char *v)
113	{
114	return *this << data (v, strlen (v ? v : 0));
115	}
116
117	void	106	void
118	SockList::printf (const char *format, ...)	107	client::write_outputbuffer ()
119	{	108	{
120	va_list ap;	109	while (outputbuffer.len)
121	va_start (ap, format);	110	{
		111	int res = write (fd, outputbuffer.data + outputbuffer.start,
		112	min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
122		113
123	len += vsprintf ((char *)buf + len, format, ap);	114	if (res > 0)
		115	{
		116	outputbuffer.start += res;
		117	/* wrap back to start of buffer */
		118	if (outputbuffer.start == SOCKETBUFSIZE)
		119	outputbuffer.start = 0;
124		120
125	va_end (ap);	121	outputbuffer.len -= res;
126	}	122	}
		123	else if (res == 0)
		124	{
		125	LOG (llevError, "socket write failed, connection closed.\n");
		126	destroy ();
		127	return;
		128	}
		129	else if (errno == EINTR)
		130	{
		131	// just retry
		132	}
		133	else if (errno == EAGAIN)
		134	{
		135	// delay till ready
		136	socket_ev.poll (socket_ev.poll () \| PE_W);
		137	socket_ev.start ();
		138	return;
		139	}
		140	else
		141	{
		142	LOG (llevError, "socket write failed: %s\n", strerror (errno));
		143	destroy ();
		144	return;
		145	}
		146	}
127		147
128	/* Basically does the reverse of SockList_AddInt, but on	148	socket_ev.poll (socket_ev.poll () & ~PE_W);
129	* strings instead. Same for the GetShort, but for 16 bits.
130	*/
131	int
132	GetInt_String (unsigned char *data)
133	{
134	return ((data[0] << 24) + (data[1] << 16) + (data[2] << 8) + data[3]);
135	}
136
137	short
138	GetShort_String (unsigned char *data)
139	{
140	return ((data[0] << 8) + data[1]);
141	}	149	}
142		150
143	/******************************************************************************	151	/******************************************************************************
144	*	152	*
145	* Start of read routines.	153	* Start of read routines.
146	*	154	*
147	******************************************************************************/	155	******************************************************************************/
148		156
		157	int
		158	client::next_packet ()
		159	{
		160	if (inbuf_len >= 2)
		161	{
		162	int pkt_len = (inbuf [0] << 8) \| inbuf [1];
		163
		164	if (inbuf_len >= 2 + pkt_len)
		165	return 2 + pkt_len;
		166
		167	if (inbuf_len == sizeof (inbuf))
		168	{
		169	send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED);
		170	destroy ();
		171	return -1;
		172	}
		173	}
		174
		175	return 0;
		176	}
		177
		178	void
		179	client::skip_packet (int len)
		180	{
		181	inbuf_len -= len;
		182	memmove (inbuf, inbuf + len, inbuf_len);
		183	}
		184
		185	/*****************************************************************************
		186	* Start of command dispatch area.
		187	* The commands here are protocol commands.
		188	****************************************************************************/
		189
		190	// SocketCommand, PlayingCommand, should not exist with those ugly casts
		191	#define SC(cb) (void )static_cast<void ()(char , int, client )>(cb),
		192	#define PC(cb) (void )static_cast<void ()(char , int, player )>(cb), PF_PLAYER \|
		193
149	/**	194	/**
150	* This reads from fd and puts the data in sl. We return true if we think	195	* Dispatch table for the server.
151	* we have a full packet, 0 if we have a partial packet. The only processing
152	* we do is remove the intial size value. len (As passed) is the size of the
153	* buffer allocated in the socklist. We make the assumption the buffer is
154	* at least 2 bytes long.
155	*/	196	*/
		197	static struct packet_type packets[] = {
		198	{"ncom", PC(NewPlayerCmd) PF_PLAYING \| PF_COMMAND6 },
		199	{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND0 },
156		200
157	int	201	{"examine", PC(ExamineCmd) PF_PLAYING },
158	SockList_ReadPacket (int fd, SockList *sl, int len)	202	{"ex", PC(ExCmd) PF_PLAYING },
159	{	203	{"apply", PC(ApplyCmd) PF_PLAYING },
160	int stat, toread;	204	{"lookat", PC(LookAt) PF_PLAYING },
		205	{"lock", PC(LockItem) PF_PLAYING },
		206	{"mark", PC(MarkItem) PF_PLAYING },
		207	{"move", PC(MoveCmd) PF_PLAYING },
		208	{"ext", PC(ExtCmd) 0 }, // CF+
		209	{"mapredraw", PC(MapRedrawCmd) 0 },
		210	{"mapinfo", PC(MapInfoCmd) 0 }, // CF+
161		211
162	/* Sanity check - shouldn't happen */	212	{"reply", SC(ReplyCmd) 0 },
163	if (sl->len < 0)	213	{"exti", SC(ExtiCmd) 0 }, // CF+
164	{	214	{"addme", SC(AddMeCmd) 0 },
165	abort ();	215	{"askface", SC(AskFaceCmd) 0 },
		216	{"requestinfo", SC(RequestInfo) 0 },
		217	{"setfacemode", SC(SetFaceMode) 0 },
		218	{"setsound", SC(SetSound) 0 },
		219	{"setup", SC(SetUp) 0 },
		220	{"version", SC(VersionCmd) 0 },
		221	{"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /Added: tchize /
		222	{"toggleextendedtext", SC(ToggleExtendedText) 0 }, /Added: tchize /
		223	{"asksmooth", SC(AskSmooth) 0 }, /Added: tchize (smoothing technologies) /
		224	};
		225
		226	bool
		227	client::may_execute (const packet_type *pkt) const
		228	{
		229	return (!(pkt->flags & PF_PLAYER) \|\| pl)
		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)
166	}	248	{
167	/* We already have a partial packet */	249	data += 6;
168	if (sl->len < 2)	250	len -= 6;
169	{	251	}
170	do	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;
		259	}
		260
		261	void
		262	client::execute (const packet_type pkt, char data, int datalen)
		263	{
		264	if (may_execute (pkt) \|\| always_immediate (this, pkt, data, datalen))
		265	{
		266	//TODO: only one format
		267	if (pkt->flags & PF_PLAYER)
		268	((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
		269	else
		270	((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
		271	}
		272	else
		273	send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
		274	}
		275
		276	bool
		277	client::handle_packet ()
		278	{
		279	int pkt_len = next_packet ();
		280
		281	if (!pkt_len)
		282	return false;
		283	else if (pkt_len < 0)
		284	{
		285	LOG (llevError, "read error on player %s\n",
		286	pl && pl->ob ? &pl->ob->name : "[anonymous]");
		287	destroy ();
		288	return false;
		289	}
		290
		291	inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
		292
		293	/* First, break out beginning word. There are at least
		294	* a few commands that do not have any paremeters. If
		295	* we get such a command, don't worry about trying
		296	* to break it up.
		297	*/
		298	int datalen;
		299	char data = strchr ((char )inbuf + 2, ' ');
		300
		301	if (data)
		302	{
		303	*data++ = 0;
		304	datalen = pkt_len - (data - (char *)inbuf);
		305	}
		306	else
		307	{
		308	data = (char *)inbuf + 2; // better read garbage than segfault
		309	datalen = 0;
		310	}
		311
		312	for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
		313	if (!strcmp ((char *)inbuf + 2, pkt->name))
171	{	314	{
172	stat = read (fd, sl->buf + sl->len, 2 - sl->len);	315	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
		316	queue_command (pkt, data, datalen);
		317	else
		318	execute (pkt, data, datalen);
		319
		320	goto next_packet;
		321	}
		322
		323	// If we get here, we didn't find a valid command.
		324	send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
		325	next_packet:
		326	skip_packet (pkt_len);
		327
		328	// input buffer has space again
		329	socket_ev.poll (socket_ev.poll () \| PE_R);
		330
		331	return true;
		332	}
		333
		334	// callback called when socket is either readable or writable
		335	void
		336	client::socket_cb (iow &w, int got)
		337	{
		338	//TODO remove when we have better socket cleanup logic
		339	if (destroyed ())
		340	{
		341	socket_ev.poll (0);
		342	return;
		343	}
		344
		345	if (got & PE_W)
		346	{
		347	write_outputbuffer ();
		348
		349	if (!outputbuffer.len)
		350	socket_ev.poll (socket_ev.poll () & ~PE_W);
		351	}
		352
		353	if (got & PE_R)
		354	{
		355	//TODO: rate-limit tcp connection in better ways, important
		356
		357	int amount = sizeof (inbuf) - inbuf_len;
		358
		359	if (!amount)
173	}	360	{
174	while ((stat == -1) && (errno == EINTR));	361	// input buffer full
175		362	socket_ev.poll (socket_ev.poll () & ~PE_R);
176	if (stat < 0)	363	return;
177	{	364	}
178	/* In non blocking mode, EAGAIN is set when there is no	365
179	* data available.	366	amount = read (fd, inbuf + inbuf_len, amount);
180	*/	367
		368	if (!amount)
		369	{
		370	destroy ();
		371	return;
		372	}
		373	else if (amount < 0)
		374	{
181	if (errno != EAGAIN && errno != EWOULDBLOCK)	375	if (errno != EAGAIN && errno != EINTR)
182	{	376	{
183	LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));	377	LOG (llevError, "read error: %s\n", strerror (errno));
		378	destroy ();
		379	return;
184	}	380	}
185	return 0; /Error /
186	}
187	if (stat == 0)
188	return -1;
189	sl->len += stat;
190	#ifdef CS_LOGSTATS
191	cst_tot.ibytes += stat;
192	cst_lst.ibytes += stat;
193	#endif
194	if (stat < 2)
195	return 0; /* Still don't have a full packet */
196	}
197	/* Figure out how much more data we need to read. Add 2 from the
198	* end of this - size header information is not included.
199	*/
200	toread = 2 + (sl->buf[0] << 8) + sl->buf[1] - sl->len;
201	if ((toread + sl->len) >= len)
202	{
203	LOG (llevError, "SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n", toread + sl->len, len);
204	/* Quick hack in case for 'oldsocketmode' input. If we are
205	* closing the socket anyways, then reading this extra 100 bytes
206	* shouldn't hurt.
207	*/
208	read (fd, sl->buf + 2, 100);
209		381
210	/* return error so the socket is closed */	382	// should not be here, normally
211	return -1;
212	}
213	do
214	{
215	do
216	{	383	}
217	stat = read (fd, sl->buf + sl->len, toread);	384	else
218	}	385	{
219	while ((stat < 0) && (errno == EINTR));	386	inbuf_len += amount;
220	if (stat < 0)	387
		388	cmd_ev.start ();
221	{	389	}
222
223	if (errno != EAGAIN && errno != EWOULDBLOCK)
224	{
225	LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));
226	}
227	return 0; /Error /
228	}
229	if (stat == 0)
230	return -1;
231	sl->len += stat;
232	#ifdef CS_LOGSTATS
233	cst_tot.ibytes += stat;
234	cst_lst.ibytes += stat;
235	#endif
236	toread -= stat;
237	if (toread == 0)
238	return 1;
239	if (toread < 0)
240	{
241	LOG (llevError, "SockList_ReadPacket: Read more bytes than desired.\n");
242	return 1;
243	}
244	}	390	}
245	while (toread > 0);	391	}
246	return 0;	392
		393	// called whenever we have additional commands to process
		394	void
		395	client::cmd_cb (iw &w)
		396	{
		397	if (handle_packet ())
		398	w.start ();
		399	else
		400	flush ();
247	}	401	}
248		402
249	/*******************************************************************************	403	/*******************************************************************************
250	*	404	*
251	* Start of write related routines.	405	* Start of write related routines.
256	* Adds data to a socket buffer for whatever reason.	410	* Adds data to a socket buffer for whatever reason.
257	*	411	*
258	* ns is the socket we are adding the data to, buf is the start of the	412	* ns is the socket we are adding the data to, buf is the start of the
259	* data, and len is the number of bytes to add.	413	* data, and len is the number of bytes to add.
260	*/	414	*/
261		415	void
262	static void	416	client::send (void *buf_, int len)
263	add_to_buffer (NewSocket * ns, char *buf, int len)
264	{	417	{
		418	char buf = (char )buf_;
		419
		420	if (destroyed () \|\| !buf)
		421	return;
		422
		423	if (len + outputbuffer.len > SOCKETBUFSIZE)
		424	{
		425	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
		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);
		429	return;
		430	}
		431
265	int avail, end;	432	int avail, end;
266
267	if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
268	{
269	LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
270	ns->status = Ns_Dead;
271	return;
272	}
273		433
274	/* data + end is where we start putting the new data. The last byte	434	/* data + end is where we start putting the new data. The last byte
275	* currently in use is actually data + end -1	435	* currently in use is actually data + end -1
276	*/	436	*/
277
278	end = ns->outputbuffer.start + ns->outputbuffer.len;	437	end = outputbuffer.start + outputbuffer.len;
279	/* The buffer is already in a wrapped state, so adjust end */	438	/* The buffer is already in a wrapped state, so adjust end */
280	if (end >= SOCKETBUFSIZE)	439	if (end >= SOCKETBUFSIZE)
281	end -= SOCKETBUFSIZE;	440	end -= SOCKETBUFSIZE;
282		441
283	avail = SOCKETBUFSIZE - end;	442	avail = SOCKETBUFSIZE - end;
284		443
285	/* We can all fit it behind the current data without wrapping */	444	/* We can all fit it behind the current data without wrapping */
286	if (avail >= len)	445	if (avail >= len)
287	memcpy (ns->outputbuffer.data + end, buf, len);	446	memcpy (outputbuffer.data + end, buf, len);
288	else	447	else
289	{	448	{
290	memcpy (ns->outputbuffer.data + end, buf, avail);	449	memcpy (outputbuffer.data + end, buf, avail);
291	memcpy (ns->outputbuffer.data, buf + avail, len - avail);	450	memcpy (outputbuffer.data, buf + avail, len - avail);
292	}	451	}
293		452
294	ns->outputbuffer.len += len;	453	outputbuffer.len += len;
295	#if 0
296	LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
297	#endif
298	}	454	}
299
300	/**
301	* Writes data to socket.
302	*
303	* When the socket is clear to write, and we have backlogged data, this
304	* is called to write it out.
305	*/
306	void
307	write_socket_buffer (NewSocket * ns)
308	{
309	int amt, max;
310
311	if (ns->outputbuffer.len == 0)
312	{
313	LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
314	return;
315	}
316
317	do
318	{
319	max = SOCKETBUFSIZE - ns->outputbuffer.start;
320	if (ns->outputbuffer.len < max)
321	max = ns->outputbuffer.len;
322
323	do
324	{
325	amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
326	}
327	while ((amt < 0) && (errno == EINTR));
328
329	if (amt < 0)
330	{ /* We got an error */
331
332	if (errno != EWOULDBLOCK)
333	{
334	LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
335	ns->status = Ns_Dead;
336	return;
337	}
338	else
339	{ /* EWOULDBLOCK */
340	/* can't write it, so store it away. */
341	ns->can_write = 0;
342	return;
343	}
344	}
345	ns->outputbuffer.start += amt;
346	/* wrap back to start of buffer */
347	if (ns->outputbuffer.start == SOCKETBUFSIZE)
348	ns->outputbuffer.start = 0;
349	ns->outputbuffer.len -= amt;
350	#ifdef CS_LOGSTATS
351	cst_tot.obytes += amt;
352	cst_lst.obytes += amt;
353	#endif
354	}
355	while (ns->outputbuffer.len > 0);
356	}
357
358	/**
359	* This writes data to the socket. - It is very low level -
360	* all we try and do is write out the data to the socket
361	* provided (ns). buf is the data to write, len is the number
362	* of bytes to write. IT doesn't return anything - rather, it
363	* updates the ns structure if we get an error.
364	*/
365	void
366	Write_To_Socket (NewSocket * ns, char *buf, int len)
367	{
368	int amt = 0;
369	char *pos = buf;
370
371	if (ns->status == Ns_Dead \|\| !buf)
372	{
373	LOG (llevDebug, "Write_To_Socket called with dead socket\n");
374	return;
375	}
376
377	#ifndef __GNU__ /* This caused problems on Hurd */
378	if (!ns->can_write)
379	{
380	add_to_buffer (ns, buf, len);
381	return;
382	}
383	#endif
384	/* If we manage to write more than we wanted, take it as a bonus */
385	while (len > 0)
386	{
387
388	do
389	{
390	amt = write (ns->fd, pos, len);
391	}
392	while ((amt < 0) && (errno == EINTR));
393
394	if (amt < 0)
395	{ /* We got an error */
396	if (errno != EWOULDBLOCK)
397	{
398	LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
399	errno, strerror (errno));
400	ns->status = Ns_Dead;
401	return;
402	}
403	else
404	{ /* EWOULDBLOCK */
405	/* can't write it, so store it away. */
406	add_to_buffer (ns, pos, len);
407	ns->can_write = 0;
408	return;
409	}
410	}
411	/* amt gets set to 0 above in blocking code, so we do this as
412	* an else if to make sure we don't reprocess it.
413	*/
414	else if (amt == 0)
415	{
416	LOG (llevError, "Write_To_Socket: No data written out.\n");
417	}
418	len -= amt;
419	pos += amt;
420	#ifdef CS_LOGSTATS
421	cst_tot.obytes += amt;
422	cst_lst.obytes += amt;
423	#endif
424	}
425	}
426
427		455
428	/**	456	/**
429	* Takes a string of data, and writes it out to the socket. A very handy	457	* Takes a string of data, and writes it out to the socket. A very handy
430	* shortcut function.	458	* shortcut function.
431	*/	459	*/
432	void	460	void
433	cs_write_string (NewSocket ns, const char buf, int len)	461	client::send_packet (packet &sl)
434	{	462	{
435	SockList sl;	463	if (destroyed ())
436
437	sl.len = len;
438	sl.buf = (unsigned char *) buf;
439	Send_With_Handling (ns, &sl);
440	}
441
442
443	/**
444	* Calls Write_To_Socket to send data to the client.
445	*
446	* The only difference in this function is that we take a SockList
447	*, and we prepend the length information.
448	*/
449	void
450	Send_With_Handling (NewSocket ns, SockList msg)
451	{
452	unsigned char sbuf[4];
453
454	if (ns->status == Ns_Dead \|\| !msg)
455	return;	464	return;
456		465
457	if (msg->len >= MAXSOCKBUF)	466	if (sl.length () >= MAXSOCKBUF)
458	{	467	{
459	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len);	468	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
460	/* Almost certainly we've overflowed a buffer, so quite now to make	469	/* Almost certainly we've overflowed a buffer, so quit now to make
461	* it easier to debug.	470	* it easier to debug.
462	*/	471	*/
463	abort ();	472	abort ();
464	}	473	}
465	sbuf[0] = ((uint32) (msg->len) >> 8) & 0xFF;
466	sbuf[1] = ((uint32) (msg->len)) & 0xFF;
467	if (ns->status != Ns_Old)
468	Write_To_Socket (ns, (char *) sbuf, 2);
469	Write_To_Socket (ns, (char *) msg->buf, msg->len);
470	}
471		474
472	/**	475	if (!sl.length ())
473	* Takes a string of data, and writes it out to the socket. A very handy	476	return;
474	* shortcut function.
475	*/
476	void
477	Write_String_To_Socket (NewSocket ns, char buf, int len)
478	{
479	SockList sl;
480		477
481	sl.len = len;	478	assert (sl.hdrlen == 2);
482	sl.buf = (unsigned char *) buf;
483	Send_With_Handling (ns, &sl);
484	}
485		479
		480	sl.buf_ [0] = sl.length () >> 8;
		481	sl.buf_ [1] = sl.length () ;
486		482
		483	send (sl.buf_, sl.length () + sl.hdrlen);
		484	}
		485
		486	void
		487	client::send_packet (const char *buf, int len)
		488	{
		489	packet sl;
		490
		491	sl << data (buf, len);
		492	send_packet (sl);
		493	}
		494
		495	void
		496	client::send_packet (const char *buf)
		497	{
		498	send_packet (buf, strlen (buf));
		499	}
		500
		501	void
		502	client::send_packet_printf (const char *format, ...)
		503	{
		504	packet sl;
		505
		506	va_list ap;
		507	va_start (ap, format);
		508	sl.vprintf (format, ap);
		509	va_end (ap);
		510
		511	send_packet (sl);
		512	}
		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
487	/******************************************************************************	540	/***********************************************************************
488	*	541	*
489	* statistics logging functions.	542	* packet functions/utilities
490	*	543	*
491	******************************************************************************/	544	**********************************************************************/
492		545
493	#ifdef CS_LOGSTATS	546	packet::packet (const char *name)
494
495	/* cst_tot is for the life of the server, cst_last is for the last series of
496	* stats
497	*/
498	CS_Stats cst_tot, cst_lst;
499
500	/**
501	* Writes out the gathered stats. We clear cst_lst.
502	*/
503	void
504	write_cs_stats (void)
505	{	547	{
506	time_t now = time (NULL);	548	reset ();
507		549
508	/* If no connections recently, don't both to log anything */	550	int len = strlen (name);
509	if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)	551	memcpy (cur, name, len); cur += len;
510	return;	552	*cur++ = ' ';
511
512	/* CSSTAT is put in so scripts can easily find the line */
513	LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
514	ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
515	now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
516	cst_lst.ibytes = 0;
517	cst_lst.obytes = 0;
518	cst_lst.max_conn = socket_info.nconns;
519	cst_lst.time_start = now;
520	}	553	}
521	#endif
522		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
		573	packet &packet::operator <<(const data &v)
		574	{
		575	if (room () < v.len)
		576	reset ();
		577	else
		578	{
		579	if (v.len)
		580	{
		581	memcpy (cur, v.ptr, v.len);
		582	cur += v.len;
		583	}
		584	}
		585
		586	return *this;
		587	}
		588
		589	packet &packet::operator <<(const data8 &v)
		590	{
		591	unsigned int len = min (v.len, 0x00FF);
		592	return *this << uint8 (len) << data (v.ptr, len);
		593	}
		594
		595	packet &packet::operator <<(const data16 &v)
		596	{
		597	unsigned int len = min (v.len, 0xFFFF);
		598	return *this << uint16 (len) << data (v.ptr, len);
		599	}
		600
		601	packet &packet::operator <<(const char *v)
		602	{
		603	return *this << data (v, strlen (v ? v : 0));
		604	}
		605
		606	void
		607	packet::vprintf (const char *format, va_list ap)
		608	{
		609	int size = room ();
		610
		611	int len = vsnprintf ((char *)cur, size, format, ap);
		612
		613	if (len >= size)
		614	return reset ();
		615
		616	cur += len;
		617	}
		618

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Comparing deliantra/server/socket/lowlevel.C (file contents): Revision 1.11 by root, Wed Dec 13 21:27:09 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 1.11 by root, Wed Dec 13 21:27:09 2006 UTC vs.
Revision 1.51 by root, Sat Jul 28 00:15:03 2007 UTC