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

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.10 by root, Wed Dec 13 18:51:50 2006 UTC vs.
Revision 1.50 by root, Thu Jul 12 19:36:58 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>
		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	#define HAVE_SIOCOUTQ 1 //TODO configure.ac support
50	// easily die in 20 seconds...	37	#if HAVE_SIOCOUTQ
51	#define SOCKET_TIMEOUT1 10	38	# include <linux/sockios.h>
52	#define SOCKET_TIMEOUT2 20
53
54	void
55	Socket_Flush (NewSocket * ns)
56	{
57	#ifdef __linux__
58	// check time of last ack, and, if too old, kill connection
59	struct tcp_info tcpi;
60	socklen_t len = sizeof (tcpi);
61
62	if (!getsockopt (ns->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	if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s
67	&& SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s
68	{
69	LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd,
70	(unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
71	ns->status = Ns_Dead;
72	}
73	}
74
75	int val;
76
77	val = 0; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
78	val = 1; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
79	#endif	39	#endif
80	}
81		40
82	/***********************************************************************	41	// disconnect a socket after this many seconds without an ack
83	*	42	#define SOCKET_TIMEOUT 8.
84	* SockList functions/utilities
85	*
86	**********************************************************************/
87		43
88	SockList &SockList::operator <<(const data8 &v)	44	// force a packet when idle for more than this many seconds,
89	{	45	// forcing an ack regularly.
90	*this << uint8 (v.len);	46	#define IDLE_PING 2.
91		47
92	memcpy (buf + len, v.data, v.len);	48	void
93	len += v.len;	49	client::flush ()
94
95	return *this;
96	}
97
98	SockList &SockList::operator <<(const data16 &v)
99	{	50	{
100	*this << uint16 (v.len);	51	if (destroyed ())
		52	return;
101		53
102	memcpy (buf + len, v.data, v.len);	54	# if HAVE_SIOCOUTQ
103	len += v.len;
104
105	return *this;
106	}
107
108	SockList &SockList::operator <<(const char *v)
109	{
110	if (v)
111	{	55	{
112	int l = strlen (v);	56	int value;
113	memcpy (buf + len, v, l);	57
114	len += l;	58	if (!ioctl (fd, SIOCOUTQ, &value))
		59	outq = value;
		60	}
		61	# endif
		62
		63	#if HAVE_TCP_INFO
		64	// check about once per second, spread evenly over all clients
		65	// do this only when player is active
		66	if (!((pticks + fd) & 7) && pl && pl->active)
115	}	67	{
		68	// check time of last ack, and, if too old, kill connection
		69	struct tcp_info tcpi;
		70	socklen_t len = sizeof (tcpi);
116		71
117	return *this;	72	if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
118	}	73	{
		74	if (tcpi.tcpi_snd_mss)
		75	mss = tcpi.tcpi_snd_mss;
119		76
120	/* Basically does the reverse of SockList_AddInt, but on	77	rtt = tcpi.tcpi_rtt;
121	* strings instead. Same for the GetShort, but for 16 bits.	78	rttvar = tcpi.tcpi_rttvar;
		79
		80	if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
		81	{
		82	send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
		83	write_outputbuffer ();
		84
		85	LOG (llevDebug, "connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
		86	(unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
		87	destroy ();
		88	}
		89	}
		90	}
		91	#endif
		92
		93	/**
		94	* Writes data to socket.
		95	*
		96	* When the socket is clear to write, and we have backlogged data, this
		97	* is called to write it out.
122	*/	98	*/
123	int
124	GetInt_String (unsigned char *data)
125	{
126	return ((data[0] << 24) + (data[1] << 16) + (data[2] << 8) + data[3]);
127	}
128		99
129	short	100	// write a nop to the socket at least every IDLE_NOP seconds.
130	GetShort_String (unsigned char *data)	101	if (!outputbuffer.len)
		102	{
		103	if (last_send + IDLE_PING <= NOW && pl && pl->active)
		104	{
		105	// this is a bit ugly, but map1/map1a seem to be the only
		106	// nop'able commands and they are quite small.
		107	packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
		108	send_packet (sl);
		109	}
		110	else
		111	return;
		112	}
		113
		114	if (socket_ev.poll () & PE_W)
		115	return;
		116
		117	last_send = NOW;
		118	write_outputbuffer ();
		119	}
		120
		121	void
		122	client::write_outputbuffer ()
131	{	123	{
132	return ((data[0] << 8) + data[1]);	124	while (outputbuffer.len)
		125	{
		126	int res = write (fd, outputbuffer.data + outputbuffer.start,
		127	min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
		128
		129	if (res > 0)
		130	{
		131	outputbuffer.start += res;
		132	/* wrap back to start of buffer */
		133	if (outputbuffer.start == SOCKETBUFSIZE)
		134	outputbuffer.start = 0;
		135
		136	outputbuffer.len -= res;
		137	}
		138	else if (res == 0)
		139	{
		140	LOG (llevError, "socket write failed, connection closed.\n");
		141	destroy ();
		142	return;
		143	}
		144	else if (errno == EINTR)
		145	{
		146	// just retry
		147	}
		148	else if (errno == EAGAIN)
		149	{
		150	// delay till ready
		151	socket_ev.poll (socket_ev.poll () \| PE_W);
		152	socket_ev.start ();
		153	return;
		154	}
		155	else
		156	{
		157	LOG (llevError, "socket write failed: %s\n", strerror (errno));
		158	destroy ();
		159	return;
		160	}
		161	}
		162
		163	socket_ev.poll (socket_ev.poll () & ~PE_W);
133	}	164	}
134		165
135	/******************************************************************************	166	/******************************************************************************
136	*	167	*
137	* Start of read routines.	168	* Start of read routines.
138	*	169	*
139	******************************************************************************/	170	******************************************************************************/
140		171
		172	int
		173	client::next_packet ()
		174	{
		175	if (inbuf_len >= 2)
		176	{
		177	int pkt_len = (inbuf [0] << 8) \| inbuf [1];
		178
		179	if (inbuf_len >= 2 + pkt_len)
		180	return 2 + pkt_len;
		181
		182	if (inbuf_len == sizeof (inbuf))
		183	{
		184	send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED);
		185	destroy ();
		186	return -1;
		187	}
		188	}
		189
		190	return 0;
		191	}
		192
		193	void
		194	client::skip_packet (int len)
		195	{
		196	inbuf_len -= len;
		197	memmove (inbuf, inbuf + len, inbuf_len);
		198	}
		199
		200	/*****************************************************************************
		201	* Start of command dispatch area.
		202	* The commands here are protocol commands.
		203	****************************************************************************/
		204
		205	// SocketCommand, PlayingCommand, should not exist with those ugly casts
		206	#define SC(cb) (void )static_cast<void ()(char , int, client )>(cb),
		207	#define PC(cb) (void )static_cast<void ()(char , int, player )>(cb), PF_PLAYER \|
		208
141	/**	209	/**
142	* This reads from fd and puts the data in sl. We return true if we think	210	* Dispatch table for the server.
143	* we have a full packet, 0 if we have a partial packet. The only processing
144	* we do is remove the intial size value. len (As passed) is the size of the
145	* buffer allocated in the socklist. We make the assumption the buffer is
146	* at least 2 bytes long.
147	*/	211	*/
		212	static struct packet_type packets[] = {
		213	{"ncom", PC(NewPlayerCmd) PF_PLAYING \| PF_COMMAND6 },
		214	{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND0 },
148		215
149	int	216	{"examine", PC(ExamineCmd) PF_PLAYING },
150	SockList_ReadPacket (int fd, SockList * sl, int len)	217	{"ex", PC(ExCmd) PF_PLAYING },
151	{	218	{"apply", PC(ApplyCmd) PF_PLAYING },
152	int stat, toread;	219	{"lookat", PC(LookAt) PF_PLAYING },
		220	{"lock", PC(LockItem) PF_PLAYING },
		221	{"mark", PC(MarkItem) PF_PLAYING },
		222	{"move", PC(MoveCmd) PF_PLAYING },
		223	{"ext", PC(ExtCmd) 0 }, // CF+
		224	{"mapredraw", PC(MapRedrawCmd) 0 },
		225	{"mapinfo", PC(MapInfoCmd) 0 }, // CF+
153		226
154	/* Sanity check - shouldn't happen */	227	{"reply", SC(ReplyCmd) 0 },
155	if (sl->len < 0)	228	{"exti", SC(ExtiCmd) 0 }, // CF+
156	{	229	{"addme", SC(AddMeCmd) 0 },
157	abort ();	230	{"askface", SC(AskFaceCmd) 0 },
		231	{"requestinfo", SC(RequestInfo) 0 },
		232	{"setfacemode", SC(SetFaceMode) 0 },
		233	{"setsound", SC(SetSound) 0 },
		234	{"setup", SC(SetUp) 0 },
		235	{"version", SC(VersionCmd) 0 },
		236	{"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /Added: tchize /
		237	{"toggleextendedtext", SC(ToggleExtendedText) 0 }, /Added: tchize /
		238	{"asksmooth", SC(AskSmooth) 0 }, /Added: tchize (smoothing technologies) /
		239	};
		240
		241	bool
		242	client::may_execute (const packet_type *pkt) const
		243	{
		244	return (!(pkt->flags & PF_PLAYER) \|\| pl)
		245	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
		246	}
		247
		248	// HACK: some commands currently should be executed
		249	// even when the player is frozen. this hack detects
		250	// those commands. it should be folded into may_execute,
		251	// but kept seperate to emphasise the hack aspect, i.e.
		252	// do it better, then remove.
		253	static bool
		254	always_immediate (const client ns, const packet_type pkt, const char *data, int len)
		255	{
		256	if (!(pkt->flags & (PF_COMMAND0 \| PF_COMMAND6)))
		257	return false;
		258
		259	if (!ns->pl \|\| !ns->pl->ob \|\| !ns->pl->ob->map)
		260	return false;
		261
		262	if (pkt->flags & PF_COMMAND6)
158	}	263	{
159	/* We already have a partial packet */	264	data += 6;
160	if (sl->len < 2)	265	len -= 6;
161	{	266	}
162	do	267
		268	if (len > 4 && !strncmp (data, "say " , 4))
		269	return true;
		270	if (len > 5 && !strncmp (data, "chat ", 5))
		271	return true;
		272
		273	return false;
		274	}
		275
		276	void
		277	client::execute (const packet_type pkt, char data, int datalen)
		278	{
		279	if (may_execute (pkt) \|\| always_immediate (this, pkt, data, datalen))
		280	{
		281	//TODO: only one format
		282	if (pkt->flags & PF_PLAYER)
		283	((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
		284	else
		285	((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
		286	}
		287	else
		288	send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
		289	}
		290
		291	bool
		292	client::handle_packet ()
		293	{
		294	int pkt_len = next_packet ();
		295
		296	if (!pkt_len)
		297	return false;
		298	else if (pkt_len < 0)
		299	{
		300	LOG (llevError, "read error on player %s\n",
		301	pl && pl->ob ? &pl->ob->name : "[anonymous]");
		302	destroy ();
		303	return false;
		304	}
		305
		306	inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
		307
		308	/* First, break out beginning word. There are at least
		309	* a few commands that do not have any paremeters. If
		310	* we get such a command, don't worry about trying
		311	* to break it up.
		312	*/
		313	int datalen;
		314	char data = strchr ((char )inbuf + 2, ' ');
		315
		316	if (data)
		317	{
		318	*data++ = 0;
		319	datalen = pkt_len - (data - (char *)inbuf);
		320	}
		321	else
		322	{
		323	data = (char *)inbuf + 2; // better read garbage than segfault
		324	datalen = 0;
		325	}
		326
		327	for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
		328	if (!strcmp ((char *)inbuf + 2, pkt->name))
163	{	329	{
164	stat = read (fd, sl->buf + sl->len, 2 - sl->len);	330	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
		331	queue_command (pkt, data, datalen);
		332	else
		333	execute (pkt, data, datalen);
		334
		335	goto next_packet;
		336	}
		337
		338	// If we get here, we didn't find a valid command.
		339	send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
		340	next_packet:
		341	skip_packet (pkt_len);
		342
		343	// input buffer has space again
		344	socket_ev.poll (socket_ev.poll () \| PE_R);
		345
		346	return true;
		347	}
		348
		349	// callback called when socket is either readable or writable
		350	void
		351	client::socket_cb (iow &w, int got)
		352	{
		353	//TODO remove when we have better socket cleanup logic
		354	if (destroyed ())
		355	{
		356	socket_ev.poll (0);
		357	return;
		358	}
		359
		360	if (got & PE_W)
		361	{
		362	write_outputbuffer ();
		363
		364	if (!outputbuffer.len)
		365	socket_ev.poll (socket_ev.poll () & ~PE_W);
		366	}
		367
		368	if (got & PE_R)
		369	{
		370	//TODO: rate-limit tcp connection in better ways, important
		371
		372	int amount = sizeof (inbuf) - inbuf_len;
		373
		374	if (!amount)
165	}	375	{
166	while ((stat == -1) && (errno == EINTR));	376	// input buffer full
167		377	socket_ev.poll (socket_ev.poll () & ~PE_R);
168	if (stat < 0)	378	return;
169	{	379	}
170	/* In non blocking mode, EAGAIN is set when there is no	380
171	* data available.	381	amount = read (fd, inbuf + inbuf_len, amount);
172	*/	382
		383	if (!amount)
		384	{
		385	destroy ();
		386	return;
		387	}
		388	else if (amount < 0)
		389	{
173	if (errno != EAGAIN && errno != EWOULDBLOCK)	390	if (errno != EAGAIN && errno != EINTR)
174	{	391	{
175	LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));	392	LOG (llevError, "read error: %s\n", strerror (errno));
		393	destroy ();
		394	return;
176	}	395	}
177	return 0; /Error /
178	}
179	if (stat == 0)
180	return -1;
181	sl->len += stat;
182	#ifdef CS_LOGSTATS
183	cst_tot.ibytes += stat;
184	cst_lst.ibytes += stat;
185	#endif
186	if (stat < 2)
187	return 0; /* Still don't have a full packet */
188	}
189	/* Figure out how much more data we need to read. Add 2 from the
190	* end of this - size header information is not included.
191	*/
192	toread = 2 + (sl->buf[0] << 8) + sl->buf[1] - sl->len;
193	if ((toread + sl->len) >= len)
194	{
195	LOG (llevError, "SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n", toread + sl->len, len);
196	/* Quick hack in case for 'oldsocketmode' input. If we are
197	* closing the socket anyways, then reading this extra 100 bytes
198	* shouldn't hurt.
199	*/
200	read (fd, sl->buf + 2, 100);
201		396
202	/* return error so the socket is closed */	397	// should not be here, normally
203	return -1;
204	}
205	do
206	{
207	do
208	{	398	}
209	stat = read (fd, sl->buf + sl->len, toread);	399	else
210	}	400	{
211	while ((stat < 0) && (errno == EINTR));	401	inbuf_len += amount;
212	if (stat < 0)	402
		403	cmd_ev.start ();
213	{	404	}
214
215	if (errno != EAGAIN && errno != EWOULDBLOCK)
216	{
217	LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));
218	}
219	return 0; /Error /
220	}
221	if (stat == 0)
222	return -1;
223	sl->len += stat;
224	#ifdef CS_LOGSTATS
225	cst_tot.ibytes += stat;
226	cst_lst.ibytes += stat;
227	#endif
228	toread -= stat;
229	if (toread == 0)
230	return 1;
231	if (toread < 0)
232	{
233	LOG (llevError, "SockList_ReadPacket: Read more bytes than desired.\n");
234	return 1;
235	}
236	}	405	}
237	while (toread > 0);	406	}
238	return 0;	407
		408	// called whenever we have additional commands to process
		409	void
		410	client::cmd_cb (iw &w)
		411	{
		412	if (handle_packet ())
		413	w.start ();
		414	else
		415	flush ();
239	}	416	}
240		417
241	/*******************************************************************************	418	/*******************************************************************************
242	*	419	*
243	* Start of write related routines.	420	* Start of write related routines.
248	* Adds data to a socket buffer for whatever reason.	425	* Adds data to a socket buffer for whatever reason.
249	*	426	*
250	* ns is the socket we are adding the data to, buf is the start of the	427	* ns is the socket we are adding the data to, buf is the start of the
251	* data, and len is the number of bytes to add.	428	* data, and len is the number of bytes to add.
252	*/	429	*/
253		430	void
254	static void	431	client::send (void *buf_, int len)
255	add_to_buffer (NewSocket * ns, char *buf, int len)
256	{	432	{
		433	char buf = (char )buf_;
		434
		435	if (destroyed () \|\| !buf)
		436	return;
		437
		438	if (len + outputbuffer.len > SOCKETBUFSIZE)
		439	{
		440	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
		441	// shutdown the socket, this is safer than destroying it immediately
		442	// as lots of code in the callchain might still access the map etc.
		443	shutdown (fd, SHUT_RDWR);
		444	return;
		445	}
		446
257	int avail, end;	447	int avail, end;
258
259	if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
260	{
261	LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
262	ns->status = Ns_Dead;
263	return;
264	}
265		448
266	/* data + end is where we start putting the new data. The last byte	449	/* data + end is where we start putting the new data. The last byte
267	* currently in use is actually data + end -1	450	* currently in use is actually data + end -1
268	*/	451	*/
269
270	end = ns->outputbuffer.start + ns->outputbuffer.len;	452	end = outputbuffer.start + outputbuffer.len;
271	/* The buffer is already in a wrapped state, so adjust end */	453	/* The buffer is already in a wrapped state, so adjust end */
272	if (end >= SOCKETBUFSIZE)	454	if (end >= SOCKETBUFSIZE)
273	end -= SOCKETBUFSIZE;	455	end -= SOCKETBUFSIZE;
274		456
275	avail = SOCKETBUFSIZE - end;	457	avail = SOCKETBUFSIZE - end;
276		458
277	/* We can all fit it behind the current data without wrapping */	459	/* We can all fit it behind the current data without wrapping */
278	if (avail >= len)	460	if (avail >= len)
279	memcpy (ns->outputbuffer.data + end, buf, len);	461	memcpy (outputbuffer.data + end, buf, len);
280	else	462	else
281	{	463	{
282	memcpy (ns->outputbuffer.data + end, buf, avail);	464	memcpy (outputbuffer.data + end, buf, avail);
283	memcpy (ns->outputbuffer.data, buf + avail, len - avail);	465	memcpy (outputbuffer.data, buf + avail, len - avail);
284	}	466	}
285		467
286	ns->outputbuffer.len += len;	468	outputbuffer.len += len;
287	#if 0
288	LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
289	#endif
290	}	469	}
291
292	/**
293	* Writes data to socket.
294	*
295	* When the socket is clear to write, and we have backlogged data, this
296	* is called to write it out.
297	*/
298	void
299	write_socket_buffer (NewSocket * ns)
300	{
301	int amt, max;
302
303	if (ns->outputbuffer.len == 0)
304	{
305	LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
306	return;
307	}
308
309	do
310	{
311	max = SOCKETBUFSIZE - ns->outputbuffer.start;
312	if (ns->outputbuffer.len < max)
313	max = ns->outputbuffer.len;
314
315	do
316	{
317	amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
318	}
319	while ((amt < 0) && (errno == EINTR));
320
321	if (amt < 0)
322	{ /* We got an error */
323
324	if (errno != EWOULDBLOCK)
325	{
326	LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
327	ns->status = Ns_Dead;
328	return;
329	}
330	else
331	{ /* EWOULDBLOCK */
332	/* can't write it, so store it away. */
333	ns->can_write = 0;
334	return;
335	}
336	}
337	ns->outputbuffer.start += amt;
338	/* wrap back to start of buffer */
339	if (ns->outputbuffer.start == SOCKETBUFSIZE)
340	ns->outputbuffer.start = 0;
341	ns->outputbuffer.len -= amt;
342	#ifdef CS_LOGSTATS
343	cst_tot.obytes += amt;
344	cst_lst.obytes += amt;
345	#endif
346	}
347	while (ns->outputbuffer.len > 0);
348	}
349
350	/**
351	* This writes data to the socket. - It is very low level -
352	* all we try and do is write out the data to the socket
353	* provided (ns). buf is the data to write, len is the number
354	* of bytes to write. IT doesn't return anything - rather, it
355	* updates the ns structure if we get an error.
356	*/
357	void
358	Write_To_Socket (NewSocket * ns, char *buf, int len)
359	{
360	int amt = 0;
361	char *pos = buf;
362
363	if (ns->status == Ns_Dead \|\| !buf)
364	{
365	LOG (llevDebug, "Write_To_Socket called with dead socket\n");
366	return;
367	}
368
369	#ifndef __GNU__ /* This caused problems on Hurd */
370	if (!ns->can_write)
371	{
372	add_to_buffer (ns, buf, len);
373	return;
374	}
375	#endif
376	/* If we manage to write more than we wanted, take it as a bonus */
377	while (len > 0)
378	{
379
380	do
381	{
382	amt = write (ns->fd, pos, len);
383	}
384	while ((amt < 0) && (errno == EINTR));
385
386	if (amt < 0)
387	{ /* We got an error */
388	if (errno != EWOULDBLOCK)
389	{
390	LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
391	errno, strerror (errno));
392	ns->status = Ns_Dead;
393	return;
394	}
395	else
396	{ /* EWOULDBLOCK */
397	/* can't write it, so store it away. */
398	add_to_buffer (ns, pos, len);
399	ns->can_write = 0;
400	return;
401	}
402	}
403	/* amt gets set to 0 above in blocking code, so we do this as
404	* an else if to make sure we don't reprocess it.
405	*/
406	else if (amt == 0)
407	{
408	LOG (llevError, "Write_To_Socket: No data written out.\n");
409	}
410	len -= amt;
411	pos += amt;
412	#ifdef CS_LOGSTATS
413	cst_tot.obytes += amt;
414	cst_lst.obytes += amt;
415	#endif
416	}
417	}
418
419		470
420	/**	471	/**
421	* Takes a string of data, and writes it out to the socket. A very handy	472	* Takes a string of data, and writes it out to the socket. A very handy
422	* shortcut function.	473	* shortcut function.
423	*/	474	*/
424	void	475	void
425	cs_write_string (NewSocket * ns, const char *buf, int len)	476	client::send_packet (packet &sl)
426	{	477	{
427	SockList sl;	478	if (destroyed ())
428
429	sl.len = len;
430	sl.buf = (unsigned char *) buf;
431	Send_With_Handling (ns, &sl);
432	}
433
434
435	/**
436	* Calls Write_To_Socket to send data to the client.
437	*
438	* The only difference in this function is that we take a SockList
439	*, and we prepend the length information.
440	*/
441	void
442	Send_With_Handling (NewSocket * ns, SockList * msg)
443	{
444	unsigned char sbuf[4];
445
446	if (ns->status == Ns_Dead \|\| !msg)
447	return;	479	return;
448		480
449	if (msg->len >= MAXSOCKBUF)	481	if (sl.length () >= MAXSOCKBUF)
450	{	482	{
451	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len);	483	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
452	/* Almost certainly we've overflowed a buffer, so quite now to make	484	/* Almost certainly we've overflowed a buffer, so quit now to make
453	* it easier to debug.	485	* it easier to debug.
454	*/	486	*/
455	abort ();	487	abort ();
456	}	488	}
457	sbuf[0] = ((uint32) (msg->len) >> 8) & 0xFF;
458	sbuf[1] = ((uint32) (msg->len)) & 0xFF;
459	if (ns->status != Ns_Old)
460	Write_To_Socket (ns, (char *) sbuf, 2);
461	Write_To_Socket (ns, (char *) msg->buf, msg->len);
462	}
463		489
464	/**	490	if (!sl.length ())
465	* Takes a string of data, and writes it out to the socket. A very handy	491	return;
466	* shortcut function.
467	*/
468	void
469	Write_String_To_Socket (NewSocket * ns, char *buf, int len)
470	{
471	SockList sl;
472		492
473	sl.len = len;	493	assert (sl.hdrlen == 2);
474	sl.buf = (unsigned char *) buf;
475	Send_With_Handling (ns, &sl);
476	}
477		494
		495	sl.buf_ [0] = sl.length () >> 8;
		496	sl.buf_ [1] = sl.length () ;
478		497
		498	send (sl.buf_, sl.length () + sl.hdrlen);
		499	}
		500
		501	void
		502	client::send_packet (const char *buf, int len)
		503	{
		504	packet sl;
		505
		506	sl << data (buf, len);
		507	send_packet (sl);
		508	}
		509
		510	void
		511	client::send_packet (const char *buf)
		512	{
		513	send_packet (buf, strlen (buf));
		514	}
		515
		516	void
		517	client::send_packet_printf (const char *format, ...)
		518	{
		519	packet sl;
		520
		521	va_list ap;
		522	va_start (ap, format);
		523	sl.vprintf (format, ap);
		524	va_end (ap);
		525
		526	send_packet (sl);
		527	}
		528
		529	// returns true when the message needs special (read: perl) treatment
		530	static bool
		531	msg_is_special (const char *msg)
		532	{
		533	return msg [strcspn (msg, "<[&\n")];
		534	}
		535
		536	void
		537	client::send_msg (int color, const char type, const char msg)
		538	{
		539	if (msg_is_special (msg))
		540	cfperl_send_msg (this, color, type, msg);
		541	else if (can_msg)
		542	send_packet_printf ("msg %d %s %s", color, type, msg);
		543	else if (color < 0)
		544	return; // client cannot handle this
		545	else
		546	send_packet_printf ("drawinfo %d %s", color, msg);
		547	}
		548
		549	void
		550	client::send_drawinfo (const char *msg, int flags)
		551	{
		552	send_msg (flags, "log", msg);
		553	}
		554
479	/******************************************************************************	555	/***********************************************************************
480	*	556	*
481	* statistics logging functions.	557	* packet functions/utilities
482	*	558	*
483	******************************************************************************/	559	**********************************************************************/
484		560
485	#ifdef CS_LOGSTATS	561	packet::packet (const char *name)
486
487	/* cst_tot is for the life of the server, cst_last is for the last series of
488	* stats
489	*/
490	CS_Stats cst_tot, cst_lst;
491
492	/**
493	* Writes out the gathered stats. We clear cst_lst.
494	*/
495	void
496	write_cs_stats (void)
497	{	562	{
498	time_t now = time (NULL);	563	reset ();
499		564
500	/* If no connections recently, don't both to log anything */	565	int len = strlen (name);
501	if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)	566	memcpy (cur, name, len); cur += len;
502	return;	567	*cur++ = ' ';
503
504	/* CSSTAT is put in so scripts can easily find the line */
505	LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
506	ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
507	now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
508	cst_lst.ibytes = 0;
509	cst_lst.obytes = 0;
510	cst_lst.max_conn = socket_info.nconns;
511	cst_lst.time_start = now;
512	}	568	}
513	#endif
514		569
		570	packet &packet::operator <<(const ber32 v)
		571	{
		572	enum { maxlen = 32 / 7 + 1};
		573	uint8 buf[maxlen];
		574	uint8 *p = buf + maxlen;
		575	uint32 val = v.val;
		576
		577	*--p = val & 0x7F;
		578
		579	while (val > 0x7F)
		580	{
		581	val >>= 7;
		582	*--p = (val & 0x7F) \| 0x80;
		583	}
		584
		585	return *this << data (p, buf + maxlen - p);
		586	}
		587
		588	packet &packet::operator <<(const data &v)
		589	{
		590	if (room () < v.len)
		591	reset ();
		592	else
		593	{
		594	if (v.len)
		595	{
		596	memcpy (cur, v.ptr, v.len);
		597	cur += v.len;
		598	}
		599	}
		600
		601	return *this;
		602	}
		603
		604	packet &packet::operator <<(const data8 &v)
		605	{
		606	unsigned int len = min (v.len, 0x00FF);
		607	return *this << uint8 (len) << data (v.ptr, len);
		608	}
		609
		610	packet &packet::operator <<(const data16 &v)
		611	{
		612	unsigned int len = min (v.len, 0xFFFF);
		613	return *this << uint16 (len) << data (v.ptr, len);
		614	}
		615
		616	packet &packet::operator <<(const char *v)
		617	{
		618	return *this << data (v, strlen (v ? v : 0));
		619	}
		620
		621	void
		622	packet::vprintf (const char *format, va_list ap)
		623	{
		624	int size = room ();
		625
		626	int len = vsnprintf ((char *)cur, size, format, ap);
		627
		628	if (len >= size)
		629	return reset ();
		630
		631	cur += len;
		632	}
		633

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Comparing deliantra/server/socket/lowlevel.C (file contents): Revision 1.10 by root, Wed Dec 13 18:51:50 2006 UTC vs. Revision 1.50 by root, Thu Jul 12 19:36:58 2007 UTC

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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.10 by root, Wed Dec 13 18:51:50 2006 UTC vs.
Revision 1.50 by root, Thu Jul 12 19:36:58 2007 UTC