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

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.6 by root, Thu Sep 14 22:34:06 2006 UTC vs.
Revision 1.41 by root, Fri May 18 19:46:22 2007 UTC

…		…
1	/*	1	/*
2	CrossFire, A Multiplayer game for X-windows	2	* CrossFire, A Multiplayer game
3		3	*
		4	* Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team
4	Copyright (C) 1992 Frank Tore Johansen	5	* Copyright (C) 1992 Frank Tore Johansen
5		6	*
6	This program is free software; you can redistribute it and/or modify	7	* This program is free software; you can redistribute it and/or modify
7	it under the terms of the GNU General Public License as published by	8	* it under the terms of the GNU General Public License as published by
8	the Free Software Foundation; either version 2 of the License, or	9	* the Free Software Foundation; either version 2 of the License, or
9	(at your option) any later version.	10	* (at your option) any later version.
10		11	*
11	This program is distributed in the hope that it will be useful,	12	* This program is distributed in the hope that it will be useful,
12	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	GNU General Public License for more details.	15	* GNU General Public License for more details.
15		16	*
16	You should have received a copy of the GNU General Public License	17	* You should have received a copy of the GNU General Public License
17	along with this program; if not, write to the Free Software	18	* along with this program; if not, write to the Free Software
18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.	19	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19		20	*
20	The author can be reached via e-mail to mark@pyramid.com	21	* The author can be reached via e-mail to mark@pyramid.com
21	*/	22	*/
22		23
23	/**	24	/**
24	* \file	25	* \file
25	* Low-level socket-related functions.	26	* Low-level socket-related functions.
26	*	27	*
27	* \date 2003-12-02	28	* \date 2003-12-02
33	*/	34	*/
34		35
35	using namespace std;	36	using namespace std;
36		37
37	#include <global.h>	38	#include <global.h>
38	#include <newclient.h>
39	#include <sproto.h>	39	#include <sproto.h>
		40	#include <cstdarg>
40		41
41	#ifdef __linux__	42	#ifdef __linux__
42	# include <sys/types.h>	43	# include <sys/types.h>
43	# include <sys/socket.h>	44	# include <sys/socket.h>
44	# include <netinet/in.h>	45	# include <netinet/in.h>
45	# define TCP_HZ 1000 // sorry...
46	# include <netinet/tcp.h>	46	# include <netinet/tcp.h>
47	#endif	47	#endif
48		48
49	// use a really low timeout, as it doesn't cost any bandwidth, and you can	49	// use a really low timeout, as it doesn't cost any bandwidth, and you can
50	// easily die in 20 seconds...	50	// easily die in 20 seconds...
51	#define SOCKET_TIMEOUT1 10	51	#define SOCKET_TIMEOUT1 10 * 1000
52	#define SOCKET_TIMEOUT2 20	52	#define SOCKET_TIMEOUT2 20 * 1000
53		53
54	void	54	void
55	Socket_Flush (NewSocket * ns)	55	client::flush ()
56	{	56	{
		57	if (destroyed ())
		58	return;
		59
57	#ifdef __linux__	60	#ifdef __linux__
58	// check time of last ack, and, if too old, kill connection	61	// check time of last ack, and, if too old, kill connection
59	struct tcp_info tcpi;	62	struct tcp_info tcpi;
60	socklen_t len = sizeof (tcpi);	63	socklen_t len = sizeof (tcpi);
61		64
62	if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))	65	if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
63	{	66	{
64	unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;	67	unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
65		68
		69	rtt = tcpi.tcpi_rtt;
		70	rttvar = tcpi.tcpi_rttvar;
		71
66	if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s	72	if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s
67	&& SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s	73	&& SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s
68	{	74	{
69	LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd,	75	LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
70	(unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);	76	(unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
71	ns->status = Ns_Dead;	77	destroy ();
72	}	78	}
73	}	79	}
74
75	int val;
76
77	val = 0;
78	setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
79	val = 1;
80	setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
81	#endif	80	#endif
82	}
83		81
		82	/**
		83	* Writes data to socket.
		84	*
		85	* When the socket is clear to write, and we have backlogged data, this
		86	* is called to write it out.
		87	*/
		88
		89	if (!outputbuffer.len \|\| socket_ev.poll () & PE_W)
		90	return;
		91
		92	write_outputbuffer ();
		93	}
		94
		95	void
		96	client::write_outputbuffer ()
		97	{
		98	while (outputbuffer.len)
		99	{
		100	int res = write (fd, outputbuffer.data + outputbuffer.start,
		101	min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
		102
		103	if (res > 0)
		104	{
		105	outputbuffer.start += res;
		106	/* wrap back to start of buffer */
		107	if (outputbuffer.start == SOCKETBUFSIZE)
		108	outputbuffer.start = 0;
		109
		110	outputbuffer.len -= res;
		111	#ifdef CS_LOGSTATS
		112	cst_tot.obytes += res;
		113	cst_lst.obytes += res;
		114	#endif
		115	}
		116	else if (res == 0)
		117	{
		118	LOG (llevError, "socket write failed, connection closed.\n");
		119	destroy ();
		120	return;
		121	}
		122	else if (errno == EINTR)
		123	{
		124	// just retry
		125	}
		126	else if (errno == EAGAIN)
		127	{
		128	// delay till ready
		129	socket_ev.poll (socket_ev.poll () \| PE_W);
		130	socket_ev.start ();
		131	return;
		132	}
		133	else
		134	{
		135	LOG (llevError, "socket write failed: %s\n", strerror (errno));
		136	destroy ();
		137	return;
		138	}
		139	}
		140
		141	socket_ev.poll (socket_ev.poll () & ~PE_W);
		142	}
		143
		144	/******************************************************************************
		145	*
		146	* Start of read routines.
		147	*
		148	******************************************************************************/
		149
		150	int
		151	client::next_packet ()
		152	{
		153	if (inbuf_len >= 2)
		154	{
		155	int pkt_len = (inbuf [0] << 8) \| inbuf [1];
		156
		157	if (inbuf_len >= 2 + pkt_len)
		158	return 2 + pkt_len;
		159
		160	if (inbuf_len == sizeof (inbuf))
		161	{
		162	send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED);
		163	destroy ();
		164	return -1;
		165	}
		166	}
		167
		168	return 0;
		169	}
		170
		171	void
		172	client::skip_packet (int len)
		173	{
		174	inbuf_len -= len;
		175	memmove (inbuf, inbuf + len, inbuf_len);
		176	}
		177
84	/***********************************************************************	178	/*****************************************************************************
85	*	179	* Start of command dispatch area.
86	* SockList functions/utilities	180	* The commands here are protocol commands.
87	*
88	**********************************************************************/	181	****************************************************************************/
89		182
90	void	183	// SocketCommand, PlayingCommand, should not exist with those ugly casts
91	SockList_Init (SockList * sl)	184	#define SC(cb) (void )static_cast<void ()(char , int, client )>(cb),
92	{	185	#define PC(cb) (void )static_cast<void ()(char , int, player )>(cb), PF_PLAYER \|
93	sl->len = 0;
94	sl->buf = NULL;
95	}
96		186
97	void	187	/**
98	SockList_AddInt (SockList * sl, uint32 data)	188	* Dispatch table for the server.
99	{
100	sl->buf[sl->len++] = (data >> 24) & 0xff;
101	sl->buf[sl->len++] = (data >> 16) & 0xff;
102	sl->buf[sl->len++] = (data >> 8) & 0xff;
103	sl->buf[sl->len++] = data & 0xff;
104	}
105
106	void
107	SockList_AddInt64 (SockList * sl, uint64 data)
108	{
109	sl->buf[sl->len++] = (char) ((data >> 56) & 0xff);
110	sl->buf[sl->len++] = (char) ((data >> 48) & 0xff);
111	sl->buf[sl->len++] = (char) ((data >> 40) & 0xff);
112	sl->buf[sl->len++] = (char) ((data >> 32) & 0xff);
113
114	sl->buf[sl->len++] = (char) ((data >> 24) & 0xff);
115	sl->buf[sl->len++] = (char) ((data >> 16) & 0xff);
116	sl->buf[sl->len++] = (char) ((data >> 8) & 0xff);
117	sl->buf[sl->len++] = (char) (data & 0xff);
118	}
119
120	/* Basically does the reverse of SockList_AddInt, but on
121	* strings instead. Same for the GetShort, but for 16 bits.
122	*/	189	*/
123	int	190	static struct packet_type packets[] = {
124	GetInt_String (unsigned char *data)	191	{"ncom", PC(NewPlayerCmd) PF_PLAYING \| PF_COMMAND6 },
125	{	192	{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND0 },
126	return ((data[0] << 24) + (data[1] << 16) + (data[2] << 8) + data[3]);
127	}
128		193
129	short	194	{"examine", PC(ExamineCmd) PF_PLAYING },
130	GetShort_String (unsigned char *data)	195	{"ex", PC(ExCmd) PF_PLAYING },
131	{	196	{"apply", PC(ApplyCmd) PF_PLAYING },
132	return ((data[0] << 8) + data[1]);	197	{"lookat", PC(LookAt) PF_PLAYING },
133	}	198	{"lock", PC(LockItem) PF_PLAYING },
		199	{"mark", PC(MarkItem) PF_PLAYING },
		200	{"move", PC(MoveCmd) PF_PLAYING },
		201	{"ext", PC(ExtCmd) 0 }, // CF+
		202	{"mapredraw", PC(MapRedrawCmd) 0 },
		203	{"mapinfo", PC(MapInfoCmd) 0 }, // CF+
134		204
135	/******************************************************************************	205	{"reply", SC(ReplyCmd) 0 },
136	*	206	{"exti", SC(ExtiCmd) 0 }, // CF+
137	* Start of read routines.	207	{"addme", SC(AddMeCmd) 0 },
138	*	208	{"askface", SC(AskFaceCmd) 0 },
139	******************************************************************************/	209	{"requestinfo", SC(RequestInfo) 0 },
		210	{"setfacemode", SC(SetFaceMode) 0 },
		211	{"setsound", SC(SetSound) 0 },
		212	{"setup", SC(SetUp) 0 },
		213	{"version", SC(VersionCmd) 0 },
		214	{"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /Added: tchize /
		215	{"toggleextendedtext", SC(ToggleExtendedText) 0 }, /Added: tchize /
		216	{"asksmooth", SC(AskSmooth) 0 }, /Added: tchize (smoothing technologies) /
		217	};
140		218
141	/**	219	bool
142	* This reads from fd and puts the data in sl. We return true if we think	220	client::may_execute (const packet_type *pkt) const
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	*/
148
149	int
150	SockList_ReadPacket (int fd, SockList * sl, int len)
151	{	221	{
152	int stat, toread;	222	return (!(pkt->flags & PF_PLAYER) \|\| pl)
		223	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
		224	}
153		225
154	/* Sanity check - shouldn't happen */	226	// HACK: some commands currently should be executed
155	if (sl->len < 0)	227	// even when the player is frozen. this hack detects
156	{	228	// those commands. it should be folded into may_execute,
157	abort ();	229	// but kept seperate to emphasise the hack aspect, i.e.
		230	// do it better, then remove.
		231	static bool
		232	always_immediate (const client ns, const packet_type pkt, const char *data, int len)
		233	{
		234	if (!(pkt->flags & (PF_COMMAND0 \| PF_COMMAND6)))
		235	return false;
		236
		237	if (!ns->pl \|\| !ns->pl->ob \|\| !ns->pl->ob->map)
		238	return false;
		239
		240	if (pkt->flags & PF_COMMAND6)
158	}	241	{
159	/* We already have a partial packet */	242	data += 6;
160	if (sl->len < 2)	243	len -= 6;
161	{	244	}
162	#ifdef WIN32 /* **WIN32 SockList_ReadPacket: change read() to recv() /
163		245
164	stat = recv (fd, sl->buf + sl->len, 2 - sl->len, 0);	246	if (len > 4 && !strncmp (data, "say " , 4))
		247	return true;
		248	if (len > 5 && !strncmp (data, "chat ", 5))
		249	return true;
165		250
166	#else	251	return false;
167	do	252	}
		253
		254	void
		255	client::execute (const packet_type pkt, char data, int datalen)
		256	{
		257	if (may_execute (pkt) \|\| always_immediate (this, pkt, data, datalen))
		258	{
		259	//TODO: only one format
		260	if (pkt->flags & PF_PLAYER)
		261	((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
		262	else
		263	((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
		264	}
		265	else
		266	send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
		267	}
		268
		269	bool
		270	client::handle_packet ()
		271	{
		272	int pkt_len = next_packet ();
		273
		274	if (!pkt_len)
		275	return false;
		276	else if (pkt_len < 0)
		277	{
		278	LOG (llevError, "read error on player %s\n",
		279	pl && pl->ob ? &pl->ob->name : "[anonymous]");
		280	destroy ();
		281	return false;
		282	}
		283
		284	inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
		285
		286	/* First, break out beginning word. There are at least
		287	* a few commands that do not have any paremeters. If
		288	* we get such a command, don't worry about trying
		289	* to break it up.
		290	*/
		291	int datalen;
		292	char data = strchr ((char )inbuf + 2, ' ');
		293
		294	if (data)
		295	{
		296	*data++ = 0;
		297	datalen = pkt_len - (data - (char *)inbuf);
		298	}
		299	else
		300	{
		301	data = (char *)inbuf + 2; // better read garbage than segfault
		302	datalen = 0;
		303	}
		304
		305	for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
		306	if (!strcmp ((char *)inbuf + 2, pkt->name))
168	{	307	{
169	stat = read (fd, sl->buf + sl->len, 2 - sl->len);	308	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
		309	queue_command (pkt, data, datalen);
		310	else
		311	execute (pkt, data, datalen);
		312
		313	goto next_packet;
		314	}
		315
		316	// If we get here, we didn't find a valid command.
		317	send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
		318	next_packet:
		319	skip_packet (pkt_len);
		320
		321	// input buffer has space again
		322	socket_ev.poll (socket_ev.poll () \| PE_R);
		323
		324	return true;
		325	}
		326
		327	// callback called when socket is either readable or writable
		328	void
		329	client::socket_cb (iow &w, int got)
		330	{
		331	//TODO remove when we have better socket cleanup logic
		332	if (destroyed ())
		333	{
		334	socket_ev.poll (0);
		335	return;
		336	}
		337
		338	if (got & PE_W)
		339	{
		340	write_outputbuffer ();
		341
		342	if (!outputbuffer.len)
		343	socket_ev.poll (socket_ev.poll () & ~PE_W);
		344	}
		345
		346	if (got & PE_R)
		347	{
		348	//TODO: rate-limit tcp connection in better ways, important
		349
		350	int amount = sizeof (inbuf) - inbuf_len;
		351
		352	if (!amount)
170	}	353	{
171	while ((stat == -1) && (errno == EINTR));	354	// input buffer full
172	#endif	355	socket_ev.poll (socket_ev.poll () & ~PE_R);
173	if (stat < 0)	356	return;
174	{	357	}
175	/* In non blocking mode, EAGAIN is set when there is no	358
176	* data available.	359	amount = read (fd, inbuf + inbuf_len, amount);
177	*/	360
178	#ifdef WIN32 /* **WIN32 SockList_ReadPacket: error handling for win32 /	361	if (!amount)
179	if ((stat == -1) && WSAGetLastError () != WSAEWOULDBLOCK)	362	{
		363	destroy ();
		364	return;
		365	}
		366	else if (amount < 0)
		367	{
		368	if (errno != EAGAIN && errno != EINTR)
180	{	369	{
181	if (WSAGetLastError () == WSAECONNRESET)	370	LOG (llevError, "read error: %s\n", strerror (errno));
182	LOG (llevDebug, "Connection closed by client\n");	371	destroy ();
183	else	372	return;
184	{
185	LOG (llevDebug, "ReadPacket got error %d, returning 0\n", WSAGetLastError ());
186	}
187	return -1; /* kick this user! */
188	}	373	}
189	#else
190	if (errno != EAGAIN && errno != EWOULDBLOCK)
191	{
192	LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));
193	}
194	#endif
195	return 0; /Error /
196	}
197	if (stat == 0)
198	return -1;
199	sl->len += stat;
200	#ifdef CS_LOGSTATS
201	cst_tot.ibytes += stat;
202	cst_lst.ibytes += stat;
203	#endif
204	if (stat < 2)
205	return 0; /* Still don't have a full packet */
206	}
207	/* Figure out how much more data we need to read. Add 2 from the
208	* end of this - size header information is not included.
209	*/
210	toread = 2 + (sl->buf[0] << 8) + sl->buf[1] - sl->len;
211	if ((toread + sl->len) >= len)
212	{
213	LOG (llevError, "SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n", toread + sl->len, len);
214	/* Quick hack in case for 'oldsocketmode' input. If we are
215	* closing the socket anyways, then reading this extra 100 bytes
216	* shouldn't hurt.
217	*/
218	#ifdef WIN32 /* **win32 SockList_ReadPacket: change read() to recv() /
219	recv (fd, sl->buf + 2, 100, 0);
220	#else
221	read (fd, sl->buf + 2, 100);
222	#endif /* end win32 */
223		374
224	/* return error so the socket is closed */	375	// should not be here, normally
225	return -1;
226	}
227	do
228	{
229	#ifdef WIN32 /* **win32 SockList_ReadPacket: change read() to recv() /
230	stat = recv (fd, sl->buf + sl->len, toread, 0);
231	#else
232	do
233	{	376	}
234	stat = read (fd, sl->buf + sl->len, toread);	377	else
235	}	378	{
236	while ((stat < 0) && (errno == EINTR));	379	inbuf_len += amount;
237	#endif	380
238	if (stat < 0)	381	cst_tot.ibytes += amount;
		382	cst_lst.ibytes += amount;
		383
		384	cmd_ev.start ();
239	{	385	}
240
241	#ifdef WIN32 /* **win32 SockList_ReadPacket: change error handling for win32 /
242	if ((stat == -1) && WSAGetLastError () != WSAEWOULDBLOCK)
243	{
244	if (WSAGetLastError () == WSAECONNRESET)
245	LOG (llevDebug, "Connection closed by client\n");
246	else
247	{
248	LOG (llevDebug, "ReadPacket got error %d, returning 0\n", WSAGetLastError ());
249	}
250	return -1; /* kick this user! */
251	}
252	#else
253	if (errno != EAGAIN && errno != EWOULDBLOCK)
254	{
255	LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));
256	}
257	#endif
258	return 0; /Error /
259	}
260	if (stat == 0)
261	return -1;
262	sl->len += stat;
263	#ifdef CS_LOGSTATS
264	cst_tot.ibytes += stat;
265	cst_lst.ibytes += stat;
266	#endif
267	toread -= stat;
268	if (toread == 0)
269	return 1;
270	if (toread < 0)
271	{
272	LOG (llevError, "SockList_ReadPacket: Read more bytes than desired.\n");
273	return 1;
274	}
275	}	386	}
276	while (toread > 0);	387	}
277	return 0;	388
		389	// called whenever we have additional commands to process
		390	void
		391	client::cmd_cb (iw &w)
		392	{
		393	if (handle_packet ())
		394	w.start ();
		395	else
		396	flush ();
278	}	397	}
279		398
280	/*******************************************************************************	399	/*******************************************************************************
281	*	400	*
282	* Start of write related routines.	401	* Start of write related routines.
…		…
287	* Adds data to a socket buffer for whatever reason.	406	* Adds data to a socket buffer for whatever reason.
288	*	407	*
289	* ns is the socket we are adding the data to, buf is the start of the	408	* ns is the socket we are adding the data to, buf is the start of the
290	* data, and len is the number of bytes to add.	409	* data, and len is the number of bytes to add.
291	*/	410	*/
292		411	void
293	static void	412	client::send (void *buf_, int len)
294	add_to_buffer (NewSocket * ns, char *buf, int len)
295	{	413	{
		414	char buf = (char )buf_;
		415
		416	if (destroyed () \|\| !buf)
		417	return;
		418
		419	if (len + outputbuffer.len > SOCKETBUFSIZE)
		420	{
		421	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
		422	// shutdown the socket, this is safer than destroying it immediately
		423	// as lots of code in the callchain might still access the map etc.
		424	shutdown (fd, SHUT_RDWR);
		425	return;
		426	}
		427
296	int avail, end;	428	int avail, end;
297
298	if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
299	{
300	LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
301	ns->status = Ns_Dead;
302	return;
303	}
304		429
305	/* data + end is where we start putting the new data. The last byte	430	/* data + end is where we start putting the new data. The last byte
306	* currently in use is actually data + end -1	431	* currently in use is actually data + end -1
307	*/	432	*/
308
309	end = ns->outputbuffer.start + ns->outputbuffer.len;	433	end = outputbuffer.start + outputbuffer.len;
310	/* The buffer is already in a wrapped state, so adjust end */	434	/* The buffer is already in a wrapped state, so adjust end */
311	if (end >= SOCKETBUFSIZE)	435	if (end >= SOCKETBUFSIZE)
312	end -= SOCKETBUFSIZE;	436	end -= SOCKETBUFSIZE;
		437
313	avail = SOCKETBUFSIZE - end;	438	avail = SOCKETBUFSIZE - end;
314		439
315	/* We can all fit it behind the current data without wrapping */	440	/* We can all fit it behind the current data without wrapping */
316	if (avail >= len)	441	if (avail >= len)
317	{
318	memcpy (ns->outputbuffer.data + end, buf, len);	442	memcpy (outputbuffer.data + end, buf, len);
319	}
320	else	443	else
321	{	444	{
322	memcpy (ns->outputbuffer.data + end, buf, avail);	445	memcpy (outputbuffer.data + end, buf, avail);
323	memcpy (ns->outputbuffer.data, buf + avail, len - avail);	446	memcpy (outputbuffer.data, buf + avail, len - avail);
324	}	447	}
		448
325	ns->outputbuffer.len += len;	449	outputbuffer.len += len;
326	#if 0
327	LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
328	#endif
329	}	450	}
330
331	/**
332	* Writes data to socket.
333	*
334	* When the socket is clear to write, and we have backlogged data, this
335	* is called to write it out.
336	*/
337	void
338	write_socket_buffer (NewSocket * ns)
339	{
340	int amt, max;
341
342	if (ns->outputbuffer.len == 0)
343	{
344	LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
345	return;
346	}
347
348	do
349	{
350	max = SOCKETBUFSIZE - ns->outputbuffer.start;
351	if (ns->outputbuffer.len < max)
352	max = ns->outputbuffer.len;
353
354	#ifdef WIN32 /* **win32 write_socket_buffer: change write() to send() /
355	amt = send (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max, 0);
356	#else
357	do
358	{
359	amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
360	}
361	while ((amt < 0) && (errno == EINTR));
362	#endif
363
364	if (amt < 0)
365	{ /* We got an error */
366
367	#ifdef WIN32 /* **win32 write_socket_buffer: change error handling /
368	if (amt == -1 && WSAGetLastError () != WSAEWOULDBLOCK)
369	{
370	LOG (llevError, "New socket write failed (wsb) (%d).\n", WSAGetLastError ());
371	#else
372	if (errno != EWOULDBLOCK)
373	{
374	LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
375	#endif
376	ns->status = Ns_Dead;
377	return;
378	}
379	else
380	{ /* EWOULDBLOCK */
381	/* can't write it, so store it away. */
382	ns->can_write = 0;
383	return;
384	}
385	}
386	ns->outputbuffer.start += amt;
387	/* wrap back to start of buffer */
388	if (ns->outputbuffer.start == SOCKETBUFSIZE)
389	ns->outputbuffer.start = 0;
390	ns->outputbuffer.len -= amt;
391	#ifdef CS_LOGSTATS
392	cst_tot.obytes += amt;
393	cst_lst.obytes += amt;
394	#endif
395	}
396	while (ns->outputbuffer.len > 0);
397	}
398
399	/**
400	* This writes data to the socket. - It is very low level -
401	* all we try and do is write out the data to the socket
402	* provided (ns). buf is the data to write, len is the number
403	* of bytes to write. IT doesn't return anything - rather, it
404	* updates the ns structure if we get an error.
405	*/
406	void
407	Write_To_Socket (NewSocket * ns, char *buf, int len)
408	{
409	int amt = 0;
410	char *pos = buf;
411
412	if (ns->status == Ns_Dead \|\| !buf)
413	{
414	LOG (llevDebug, "Write_To_Socket called with dead socket\n");
415	return;
416	}
417
418	#ifndef __GNU__ /* This caused problems on Hurd */
419	if (!ns->can_write)
420	{
421	add_to_buffer (ns, buf, len);
422	return;
423	}
424	#endif
425	/* If we manage to write more than we wanted, take it as a bonus */
426	while (len > 0)
427	{
428
429	#ifdef WIN32 /* **win32 Write_To_Socket: change write() to send() /
430	amt = send (ns->fd, pos, len, 0);
431	#else
432	do
433	{
434	amt = write (ns->fd, pos, len);
435	}
436	while ((amt < 0) && (errno == EINTR));
437	#endif
438
439	if (amt < 0)
440	{ /* We got an error */
441	#ifdef WIN32 /* **win32 Write_To_Socket: change error handling /
442	if (amt == -1 && WSAGetLastError () != WSAEWOULDBLOCK)
443	{
444	LOG (llevError, "New socket write failed WTS (%d).\n", WSAGetLastError ());
445	#else
446	if (errno != EWOULDBLOCK)
447	{
448	LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
449	errno, strerror (errno));
450	#endif
451	ns->status = Ns_Dead;
452	return;
453	}
454	else
455	{ /* EWOULDBLOCK */
456	/* can't write it, so store it away. */
457	add_to_buffer (ns, pos, len);
458	ns->can_write = 0;
459	return;
460	}
461	}
462	/* amt gets set to 0 above in blocking code, so we do this as
463	* an else if to make sure we don't reprocess it.
464	*/
465	else if (amt == 0)
466	{
467	LOG (llevError, "Write_To_Socket: No data written out.\n");
468	}
469	len -= amt;
470	pos += amt;
471	#ifdef CS_LOGSTATS
472	cst_tot.obytes += amt;
473	cst_lst.obytes += amt;
474	#endif
475	}
476	}
477
478		451
479	/**	452	/**
480	* Takes a string of data, and writes it out to the socket. A very handy	453	* Takes a string of data, and writes it out to the socket. A very handy
481	* shortcut function.	454	* shortcut function.
482	*/	455	*/
483	void	456	void
484	cs_write_string (NewSocket * ns, const char *buf, int len)	457	client::send_packet (packet &sl)
485	{	458	{
486	SockList sl;	459	if (destroyed ())
487
488	sl.len = len;
489	sl.buf = (unsigned char *) buf;
490	Send_With_Handling (ns, &sl);
491	}
492
493
494	/**
495	* Calls Write_To_Socket to send data to the client.
496	*
497	* The only difference in this function is that we take a SockList
498	*, and we prepend the length information.
499	*/
500	void
501	Send_With_Handling (NewSocket * ns, SockList * msg)
502	{
503	unsigned char sbuf[4];
504
505	if (ns->status == Ns_Dead \|\| !msg)
506	return;	460	return;
507		461
508	if (msg->len >= MAXSOCKBUF)	462	if (sl.length () >= MAXSOCKBUF)
509	{	463	{
510	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len);	464	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
511	/* Almost certainly we've overflowed a buffer, so quite now to make	465	/* Almost certainly we've overflowed a buffer, so quit now to make
512	* it easier to debug.	466	* it easier to debug.
513	*/	467	*/
514	abort ();	468	abort ();
515	}	469	}
516	sbuf[0] = ((uint32) (msg->len) >> 8) & 0xFF;
517	sbuf[1] = ((uint32) (msg->len)) & 0xFF;
518	if (ns->status != Ns_Old)
519	Write_To_Socket (ns, (char *) sbuf, 2);
520	Write_To_Socket (ns, (char *) msg->buf, msg->len);
521	}
522		470
523	/**	471	if (!sl.length ())
524	* Takes a string of data, and writes it out to the socket. A very handy	472	return;
525	* shortcut function.	473
		474	assert (sl.hdrlen == 2);
		475
		476	sl.buf_ [0] = sl.length () >> 8;
		477	sl.buf_ [1] = sl.length () ;
		478
		479	send (sl.buf_, sl.length () + sl.hdrlen);
		480	}
		481
		482	void
		483	client::send_packet (const char *buf, int len)
		484	{
		485	packet sl;
		486
		487	sl << data (buf, len);
		488	send_packet (sl);
		489	}
		490
		491	void
		492	client::send_packet (const char *buf)
		493	{
		494	send_packet (buf, strlen (buf));
		495	}
		496
		497	void
		498	client::send_packet_printf (const char *format, ...)
		499	{
		500	packet sl;
		501
		502	va_list ap;
		503	va_start (ap, format);
		504	sl.vprintf (format, ap);
		505	va_end (ap);
		506
		507	send_packet (sl);
		508	}
		509
		510	void
		511	client::send_drawinfo (const char *msg, int flags)
		512	{
		513	send_packet_printf ("drawinfo %d %s", flags, msg);
		514	}
		515
		516	void
		517	client::send_msg (int color, const char type, const char msg)
		518	{
		519	if (can_msg)
		520	send_packet_printf ("msg %d %s %s", color, type, msg);
		521	else if (color < 0)
		522	return; // client cannot handle this
		523	else if (strchr (msg, '<') \|\| strchr (msg, '&'))
		524	{
		525	//TODO: should escape/modify to old syntax
		526	send_packet_printf ("drawinfo %d %s", color, msg);
		527	}
		528	else
		529	send_packet_printf ("drawinfo %d %s", color, msg);
		530	}
		531
		532	/***********************************************************************
526	*/	533	*
527	void	534	* packet functions/utilities
528	Write_String_To_Socket (NewSocket * ns, char *buf, int len)	535	*
529	{	536	**********************************************************************/
530	SockList sl;
531		537
532	sl.len = len;	538	packet::packet (const char *name)
533	sl.buf = (unsigned char *) buf;	539	{
534	Send_With_Handling (ns, &sl);	540	reset ();
535	}
536		541
		542	int len = strlen (name);
		543	memcpy (cur, name, len); cur += len;
		544	*cur++ = ' ';
		545	}
		546
		547	packet &packet::operator <<(const ber32 v)
		548	{
		549	enum { maxlen = 32 / 7 + 1};
		550	uint8 buf[maxlen];
		551	uint8 *p = buf + maxlen;
		552	uint32 val = v.val;
		553
		554	*--p = val & 0x7F;
		555
		556	while (val > 0x7F)
		557	{
		558	val >>= 7;
		559	*--p = (val & 0x7F) \| 0x80;
		560	}
		561
		562	return *this << data (p, buf + maxlen - p);
		563	}
		564
		565	packet &packet::operator <<(const data &v)
		566	{
		567	if (room () < v.len)
		568	reset ();
		569	else
		570	{
		571	if (v.len)
		572	{
		573	memcpy (cur, v.ptr, v.len);
		574	cur += v.len;
		575	}
		576	}
		577
		578	return *this;
		579	}
		580
		581	packet &packet::operator <<(const data8 &v)
		582	{
		583	unsigned int len = min (v.len, 0x00FF);
		584	return *this << uint8 (len) << data (v.ptr, len);
		585	}
		586
		587	packet &packet::operator <<(const data16 &v)
		588	{
		589	unsigned int len = min (v.len, 0xFFFF);
		590	return *this << uint16 (len) << data (v.ptr, len);
		591	}
		592
		593	packet &packet::operator <<(const char *v)
		594	{
		595	return *this << data (v, strlen (v ? v : 0));
		596	}
		597
		598	void
		599	packet::vprintf (const char *format, va_list ap)
		600	{
		601	int size = room ();
		602
		603	int len = vsnprintf ((char *)cur, size, format, ap);
		604
		605	if (len >= size)
		606	return reset ();
		607
		608	cur += len;
		609	}
537		610
538	/******************************************************************************	611	/******************************************************************************
539	*	612	*
540	* statistics logging functions.	613	* statistics logging functions.
541	*	614	*
…		…
564	LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",	637	LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
565	ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,	638	ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
566	now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);	639	now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
567	cst_lst.ibytes = 0;	640	cst_lst.ibytes = 0;
568	cst_lst.obytes = 0;	641	cst_lst.obytes = 0;
569	cst_lst.max_conn = socket_info.nconns;
570	cst_lst.time_start = now;	642	cst_lst.time_start = now;
571	}	643	}
572	#endif	644	#endif
		645

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Comparing deliantra/server/socket/lowlevel.C (file contents): Revision 1.6 by root, Thu Sep 14 22:34:06 2006 UTC vs. Revision 1.41 by root, Fri May 18 19:46:22 2007 UTC

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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.6 by root, Thu Sep 14 22:34:06 2006 UTC vs.
Revision 1.41 by root, Fri May 18 19:46:22 2007 UTC