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

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.5 by root, Sun Sep 10 13:43:33 2006 UTC vs.
Revision 1.49 by root, Sun Jul 1 05:00:20 2007 UTC

…		…
1
2	/*	1	/*
3	* static char *rcsid_sockets_c =	2	* This file is part of Crossfire TRT, the Roguelike Realtime MORPG.
4	* "$Id: lowlevel.C,v 1.5 2006/09/10 13:43:33 root Exp $";	3	*
		4	* Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team
		5	* Copyright (©) 1992,2007 Frank Tore Johansen
		6	*
		7	* Crossfire TRT is free software: you can redistribute it and/or modify
		8	* it under the terms of the GNU General Public License as published by
		9	* the Free Software Foundation, either version 3 of the License, or
		10	* (at your option) any later version.
		11	*
		12	* This program is distributed in the hope that it will be useful,
		13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
		14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		15	* GNU General Public License for more details.
		16	*
		17	* You should have received a copy of the GNU General Public License
		18	* along with this program. If not, see <http://www.gnu.org/licenses/>.
		19	*
		20	* The authors can be reached via e-mail to <crossfire@schmorp.de>
5	*/	21	*/
6		22
7	/*
8	CrossFire, A Multiplayer game for X-windows
9
10	Copyright (C) 1992 Frank Tore Johansen
11
12	This program is free software; you can redistribute it and/or modify
13	it under the terms of the GNU General Public License as published by
14	the Free Software Foundation; either version 2 of the License, or
15	(at your option) any later version.
16
17	This program is distributed in the hope that it will be useful,
18	but WITHOUT ANY WARRANTY; without even the implied warranty of
19	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20	GNU General Public License for more details.
21
22	You should have received a copy of the GNU General Public License
23	along with this program; if not, write to the Free Software
24	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25
26	The author can be reached via e-mail to mark@pyramid.com
27	*/
28
29	/**
30	* \file
31	* Low-level socket-related functions.
32	*
33	* \date 2003-12-02
34	*
35	* Contains some base functions that both the client and server
36	* can use. As such, depending what we are being compiled for will
37	* determine what we can include. the client is designed have
38	* CFCLIENT defined as part of its compile flags.
39	*/
40
41	using namespace std;	23	using namespace std;
42		24
43	#include <global.h>	25	#include <global.h>
44	#include <newclient.h>
45	#include <sproto.h>	26	#include <sproto.h>
		27	#include <cstdarg>
46		28
47	#ifdef __linux__	29	#if HAVE_TCP_INFO
48	# include <sys/types.h>	30	# include <sys/types.h>
49	# include <sys/socket.h>	31	# include <sys/socket.h>
50	# include <netinet/in.h>	32	# include <netinet/in.h>
51	# define TCP_HZ 1000 // sorry...
52	# include <netinet/tcp.h>	33	# include <netinet/tcp.h>
53	#endif	34	#endif
54		35
55	// 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
56	// easily die in 20 seconds...
57	#define SOCKET_TIMEOUT1 10	37	#define SOCKET_TIMEOUT 8.
58	#define SOCKET_TIMEOUT2 20
59		38
		39	// force a packet when idle for more than this many seconds,
		40	// forcing an ack regularly.
		41	#define IDLE_PING 2.
		42
60	void	43	void
61	Socket_Flush (NewSocket * ns)	44	client::flush ()
62	{	45	{
63	#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	{
64	// check time of last ack, and, if too old, kill connection	54	// check time of last ack, and, if too old, kill connection
65	struct tcp_info tcpi;	55	struct tcp_info tcpi;
66	socklen_t len = sizeof (tcpi);	56	socklen_t len = sizeof (tcpi);
67		57
68	if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))	58	if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
69	{	59	{
70	unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;	60	if (tcpi.tcpi_snd_mss)
		61	mss = tcpi.tcpi_snd_mss;
71		62
72	if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s	63	rtt = tcpi.tcpi_rtt;
73	&& SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s	64	rttvar = tcpi.tcpi_rttvar;
		65
		66	if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
74	{	67	{
		68	send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
		69	write_outputbuffer ();
		70
75	LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd,	71	LOG (llevDebug, "connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
76	(unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);	72	(unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
77	ns->status = Ns_Dead;	73	destroy ();
78	}	74	}
		75	}
79	}	76	}
80
81	int val;
82
83	val = 0;
84	setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
85	val = 1;
86	setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
87	#endif	77	#endif
88	}
89		78
90	/***********************************************************************	79	/**
91	*	80	* Writes data to socket.
92	* SockList functions/utilities	81	*
93	*	82	* When the socket is clear to write, and we have backlogged data, this
94	**********************************************************************/	83	* is called to write it out.
95
96	void
97	SockList_Init (SockList * sl)
98	{
99	sl->len = 0;
100	sl->buf = NULL;
101	}
102
103	void
104	SockList_AddInt (SockList * sl, uint32 data)
105	{
106	sl->buf[sl->len++] = (data >> 24) & 0xff;
107	sl->buf[sl->len++] = (data >> 16) & 0xff;
108	sl->buf[sl->len++] = (data >> 8) & 0xff;
109	sl->buf[sl->len++] = data & 0xff;
110	}
111
112	void
113	SockList_AddInt64 (SockList * sl, uint64 data)
114	{
115	sl->buf[sl->len++] = (char) ((data >> 56) & 0xff);
116	sl->buf[sl->len++] = (char) ((data >> 48) & 0xff);
117	sl->buf[sl->len++] = (char) ((data >> 40) & 0xff);
118	sl->buf[sl->len++] = (char) ((data >> 32) & 0xff);
119
120	sl->buf[sl->len++] = (char) ((data >> 24) & 0xff);
121	sl->buf[sl->len++] = (char) ((data >> 16) & 0xff);
122	sl->buf[sl->len++] = (char) ((data >> 8) & 0xff);
123	sl->buf[sl->len++] = (char) (data & 0xff);
124	}
125
126	/* Basically does the reverse of SockList_AddInt, but on
127	* strings instead. Same for the GetShort, but for 16 bits.
128	*/	84	*/
129	int
130	GetInt_String (unsigned char *data)
131	{
132	return ((data[0] << 24) + (data[1] << 16) + (data[2] << 8) + data[3]);
133	}
134		85
135	short	86	// write a nop to the socket at least every IDLE_NOP seconds.
136	GetShort_String (unsigned char *data)	87	if (!outputbuffer.len)
		88	{
		89	if (last_send + IDLE_PING <= NOW && pl && pl->active)
		90	{
		91	// this is a bit ugly, but map1/map1a seem to be the only
		92	// nop'able commands and they are quite small.
		93	packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
		94	send_packet (sl);
		95	}
		96	else
		97	return;
		98	}
		99
		100	if (socket_ev.poll () & PE_W)
		101	return;
		102
		103	last_send = NOW;
		104	write_outputbuffer ();
		105	}
		106
		107	void
		108	client::write_outputbuffer ()
137	{	109	{
138	return ((data[0] << 8) + data[1]);	110	while (outputbuffer.len)
		111	{
		112	int res = write (fd, outputbuffer.data + outputbuffer.start,
		113	min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
		114
		115	if (res > 0)
		116	{
		117	outputbuffer.start += res;
		118	/* wrap back to start of buffer */
		119	if (outputbuffer.start == SOCKETBUFSIZE)
		120	outputbuffer.start = 0;
		121
		122	outputbuffer.len -= res;
		123	}
		124	else if (res == 0)
		125	{
		126	LOG (llevError, "socket write failed, connection closed.\n");
		127	destroy ();
		128	return;
		129	}
		130	else if (errno == EINTR)
		131	{
		132	// just retry
		133	}
		134	else if (errno == EAGAIN)
		135	{
		136	// delay till ready
		137	socket_ev.poll (socket_ev.poll () \| PE_W);
		138	socket_ev.start ();
		139	return;
		140	}
		141	else
		142	{
		143	LOG (llevError, "socket write failed: %s\n", strerror (errno));
		144	destroy ();
		145	return;
		146	}
		147	}
		148
		149	socket_ev.poll (socket_ev.poll () & ~PE_W);
139	}	150	}
140		151
141	/******************************************************************************	152	/******************************************************************************
142	*	153	*
143	* Start of read routines.	154	* Start of read routines.
144	*	155	*
145	******************************************************************************/	156	******************************************************************************/
146		157
		158	int
		159	client::next_packet ()
		160	{
		161	if (inbuf_len >= 2)
		162	{
		163	int pkt_len = (inbuf [0] << 8) \| inbuf [1];
		164
		165	if (inbuf_len >= 2 + pkt_len)
		166	return 2 + pkt_len;
		167
		168	if (inbuf_len == sizeof (inbuf))
		169	{
		170	send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED);
		171	destroy ();
		172	return -1;
		173	}
		174	}
		175
		176	return 0;
		177	}
		178
		179	void
		180	client::skip_packet (int len)
		181	{
		182	inbuf_len -= len;
		183	memmove (inbuf, inbuf + len, inbuf_len);
		184	}
		185
		186	/*****************************************************************************
		187	* Start of command dispatch area.
		188	* The commands here are protocol commands.
		189	****************************************************************************/
		190
		191	// SocketCommand, PlayingCommand, should not exist with those ugly casts
		192	#define SC(cb) (void )static_cast<void ()(char , int, client )>(cb),
		193	#define PC(cb) (void )static_cast<void ()(char , int, player )>(cb), PF_PLAYER \|
		194
147	/**	195	/**
148	* This reads from fd and puts the data in sl. We return true if we think	196	* Dispatch table for the server.
149	* we have a full packet, 0 if we have a partial packet. The only processing
150	* we do is remove the intial size value. len (As passed) is the size of the
151	* buffer allocated in the socklist. We make the assumption the buffer is
152	* at least 2 bytes long.
153	*/	197	*/
		198	static struct packet_type packets[] = {
		199	{"ncom", PC(NewPlayerCmd) PF_PLAYING \| PF_COMMAND6 },
		200	{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND0 },
154		201
155	int	202	{"examine", PC(ExamineCmd) PF_PLAYING },
156	SockList_ReadPacket (int fd, SockList * sl, int len)	203	{"ex", PC(ExCmd) PF_PLAYING },
157	{	204	{"apply", PC(ApplyCmd) PF_PLAYING },
158	int stat, toread;	205	{"lookat", PC(LookAt) PF_PLAYING },
		206	{"lock", PC(LockItem) PF_PLAYING },
		207	{"mark", PC(MarkItem) PF_PLAYING },
		208	{"move", PC(MoveCmd) PF_PLAYING },
		209	{"ext", PC(ExtCmd) 0 }, // CF+
		210	{"mapredraw", PC(MapRedrawCmd) 0 },
		211	{"mapinfo", PC(MapInfoCmd) 0 }, // CF+
159		212
160	/* Sanity check - shouldn't happen */	213	{"reply", SC(ReplyCmd) 0 },
161	if (sl->len < 0)	214	{"exti", SC(ExtiCmd) 0 }, // CF+
162	{	215	{"addme", SC(AddMeCmd) 0 },
163	abort ();	216	{"askface", SC(AskFaceCmd) 0 },
		217	{"requestinfo", SC(RequestInfo) 0 },
		218	{"setfacemode", SC(SetFaceMode) 0 },
		219	{"setsound", SC(SetSound) 0 },
		220	{"setup", SC(SetUp) 0 },
		221	{"version", SC(VersionCmd) 0 },
		222	{"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /Added: tchize /
		223	{"toggleextendedtext", SC(ToggleExtendedText) 0 }, /Added: tchize /
		224	{"asksmooth", SC(AskSmooth) 0 }, /Added: tchize (smoothing technologies) /
		225	};
		226
		227	bool
		228	client::may_execute (const packet_type *pkt) const
		229	{
		230	return (!(pkt->flags & PF_PLAYER) \|\| pl)
		231	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
		232	}
		233
		234	// HACK: some commands currently should be executed
		235	// even when the player is frozen. this hack detects
		236	// those commands. it should be folded into may_execute,
		237	// but kept seperate to emphasise the hack aspect, i.e.
		238	// do it better, then remove.
		239	static bool
		240	always_immediate (const client ns, const packet_type pkt, const char *data, int len)
		241	{
		242	if (!(pkt->flags & (PF_COMMAND0 \| PF_COMMAND6)))
		243	return false;
		244
		245	if (!ns->pl \|\| !ns->pl->ob \|\| !ns->pl->ob->map)
		246	return false;
		247
		248	if (pkt->flags & PF_COMMAND6)
164	}	249	{
165	/* We already have a partial packet */	250	data += 6;
166	if (sl->len < 2)	251	len -= 6;
167	{	252	}
168	#ifdef WIN32 /* **WIN32 SockList_ReadPacket: change read() to recv() /
169		253
170	stat = recv (fd, sl->buf + sl->len, 2 - sl->len, 0);	254	if (len > 4 && !strncmp (data, "say " , 4))
		255	return true;
		256	if (len > 5 && !strncmp (data, "chat ", 5))
		257	return true;
171		258
172	#else	259	return false;
173	do	260	}
		261
		262	void
		263	client::execute (const packet_type pkt, char data, int datalen)
		264	{
		265	if (may_execute (pkt) \|\| always_immediate (this, pkt, data, datalen))
		266	{
		267	//TODO: only one format
		268	if (pkt->flags & PF_PLAYER)
		269	((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
		270	else
		271	((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
		272	}
		273	else
		274	send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
		275	}
		276
		277	bool
		278	client::handle_packet ()
		279	{
		280	int pkt_len = next_packet ();
		281
		282	if (!pkt_len)
		283	return false;
		284	else if (pkt_len < 0)
		285	{
		286	LOG (llevError, "read error on player %s\n",
		287	pl && pl->ob ? &pl->ob->name : "[anonymous]");
		288	destroy ();
		289	return false;
		290	}
		291
		292	inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
		293
		294	/* First, break out beginning word. There are at least
		295	* a few commands that do not have any paremeters. If
		296	* we get such a command, don't worry about trying
		297	* to break it up.
		298	*/
		299	int datalen;
		300	char data = strchr ((char )inbuf + 2, ' ');
		301
		302	if (data)
		303	{
		304	*data++ = 0;
		305	datalen = pkt_len - (data - (char *)inbuf);
		306	}
		307	else
		308	{
		309	data = (char *)inbuf + 2; // better read garbage than segfault
		310	datalen = 0;
		311	}
		312
		313	for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
		314	if (!strcmp ((char *)inbuf + 2, pkt->name))
174	{	315	{
175	stat = read (fd, sl->buf + sl->len, 2 - sl->len);	316	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
		317	queue_command (pkt, data, datalen);
		318	else
		319	execute (pkt, data, datalen);
		320
		321	goto next_packet;
		322	}
		323
		324	// If we get here, we didn't find a valid command.
		325	send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
		326	next_packet:
		327	skip_packet (pkt_len);
		328
		329	// input buffer has space again
		330	socket_ev.poll (socket_ev.poll () \| PE_R);
		331
		332	return true;
		333	}
		334
		335	// callback called when socket is either readable or writable
		336	void
		337	client::socket_cb (iow &w, int got)
		338	{
		339	//TODO remove when we have better socket cleanup logic
		340	if (destroyed ())
		341	{
		342	socket_ev.poll (0);
		343	return;
		344	}
		345
		346	if (got & PE_W)
		347	{
		348	write_outputbuffer ();
		349
		350	if (!outputbuffer.len)
		351	socket_ev.poll (socket_ev.poll () & ~PE_W);
		352	}
		353
		354	if (got & PE_R)
		355	{
		356	//TODO: rate-limit tcp connection in better ways, important
		357
		358	int amount = sizeof (inbuf) - inbuf_len;
		359
		360	if (!amount)
176	}	361	{
177	while ((stat == -1) && (errno == EINTR));	362	// input buffer full
178	#endif	363	socket_ev.poll (socket_ev.poll () & ~PE_R);
179	if (stat < 0)	364	return;
180	{	365	}
181	/* In non blocking mode, EAGAIN is set when there is no	366
182	* data available.	367	amount = read (fd, inbuf + inbuf_len, amount);
183	*/	368
184	#ifdef WIN32 /* **WIN32 SockList_ReadPacket: error handling for win32 /	369	if (!amount)
185	if ((stat == -1) && WSAGetLastError () != WSAEWOULDBLOCK)	370	{
		371	destroy ();
		372	return;
		373	}
		374	else if (amount < 0)
		375	{
		376	if (errno != EAGAIN && errno != EINTR)
186	{	377	{
187	if (WSAGetLastError () == WSAECONNRESET)	378	LOG (llevError, "read error: %s\n", strerror (errno));
188	LOG (llevDebug, "Connection closed by client\n");	379	destroy ();
189	else	380	return;
190	{
191	LOG (llevDebug, "ReadPacket got error %d, returning 0\n", WSAGetLastError ());
192	}
193	return -1; /* kick this user! */
194	}	381	}
195	#else
196	if (errno != EAGAIN && errno != EWOULDBLOCK)
197	{
198	LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));
199	}
200	#endif
201	return 0; /Error /
202	}
203	if (stat == 0)
204	return -1;
205	sl->len += stat;
206	#ifdef CS_LOGSTATS
207	cst_tot.ibytes += stat;
208	cst_lst.ibytes += stat;
209	#endif
210	if (stat < 2)
211	return 0; /* Still don't have a full packet */
212	}
213	/* Figure out how much more data we need to read. Add 2 from the
214	* end of this - size header information is not included.
215	*/
216	toread = 2 + (sl->buf[0] << 8) + sl->buf[1] - sl->len;
217	if ((toread + sl->len) >= len)
218	{
219	LOG (llevError, "SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n", toread + sl->len, len);
220	/* Quick hack in case for 'oldsocketmode' input. If we are
221	* closing the socket anyways, then reading this extra 100 bytes
222	* shouldn't hurt.
223	*/
224	#ifdef WIN32 /* **win32 SockList_ReadPacket: change read() to recv() /
225	recv (fd, sl->buf + 2, 100, 0);
226	#else
227	read (fd, sl->buf + 2, 100);
228	#endif /* end win32 */
229		382
230	/* return error so the socket is closed */	383	// should not be here, normally
231	return -1;
232	}
233	do
234	{
235	#ifdef WIN32 /* **win32 SockList_ReadPacket: change read() to recv() /
236	stat = recv (fd, sl->buf + sl->len, toread, 0);
237	#else
238	do
239	{	384	}
240	stat = read (fd, sl->buf + sl->len, toread);	385	else
241	}	386	{
242	while ((stat < 0) && (errno == EINTR));	387	inbuf_len += amount;
243	#endif	388
244	if (stat < 0)	389	cmd_ev.start ();
245	{	390	}
246
247	#ifdef WIN32 /* **win32 SockList_ReadPacket: change error handling for win32 /
248	if ((stat == -1) && WSAGetLastError () != WSAEWOULDBLOCK)
249	{
250	if (WSAGetLastError () == WSAECONNRESET)
251	LOG (llevDebug, "Connection closed by client\n");
252	else
253	{
254	LOG (llevDebug, "ReadPacket got error %d, returning 0\n", WSAGetLastError ());
255	}
256	return -1; /* kick this user! */
257	}
258	#else
259	if (errno != EAGAIN && errno != EWOULDBLOCK)
260	{
261	LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));
262	}
263	#endif
264	return 0; /Error /
265	}
266	if (stat == 0)
267	return -1;
268	sl->len += stat;
269	#ifdef CS_LOGSTATS
270	cst_tot.ibytes += stat;
271	cst_lst.ibytes += stat;
272	#endif
273	toread -= stat;
274	if (toread == 0)
275	return 1;
276	if (toread < 0)
277	{
278	LOG (llevError, "SockList_ReadPacket: Read more bytes than desired.\n");
279	return 1;
280	}
281	}	391	}
282	while (toread > 0);	392	}
283	return 0;	393
		394	// called whenever we have additional commands to process
		395	void
		396	client::cmd_cb (iw &w)
		397	{
		398	if (handle_packet ())
		399	w.start ();
		400	else
		401	flush ();
284	}	402	}
285		403
286	/*******************************************************************************	404	/*******************************************************************************
287	*	405	*
288	* Start of write related routines.	406	* Start of write related routines.
293	* Adds data to a socket buffer for whatever reason.	411	* Adds data to a socket buffer for whatever reason.
294	*	412	*
295	* ns is the socket we are adding the data to, buf is the start of the	413	* ns is the socket we are adding the data to, buf is the start of the
296	* data, and len is the number of bytes to add.	414	* data, and len is the number of bytes to add.
297	*/	415	*/
298		416	void
299	static void	417	client::send (void *buf_, int len)
300	add_to_buffer (NewSocket * ns, char *buf, int len)
301	{	418	{
		419	char buf = (char )buf_;
		420
		421	if (destroyed () \|\| !buf)
		422	return;
		423
		424	if (len + outputbuffer.len > SOCKETBUFSIZE)
		425	{
		426	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
		427	// shutdown the socket, this is safer than destroying it immediately
		428	// as lots of code in the callchain might still access the map etc.
		429	shutdown (fd, SHUT_RDWR);
		430	return;
		431	}
		432
302	int avail, end;	433	int avail, end;
303
304	if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
305	{
306	LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
307	ns->status = Ns_Dead;
308	return;
309	}
310		434
311	/* data + end is where we start putting the new data. The last byte	435	/* data + end is where we start putting the new data. The last byte
312	* currently in use is actually data + end -1	436	* currently in use is actually data + end -1
313	*/	437	*/
314
315	end = ns->outputbuffer.start + ns->outputbuffer.len;	438	end = outputbuffer.start + outputbuffer.len;
316	/* The buffer is already in a wrapped state, so adjust end */	439	/* The buffer is already in a wrapped state, so adjust end */
317	if (end >= SOCKETBUFSIZE)	440	if (end >= SOCKETBUFSIZE)
318	end -= SOCKETBUFSIZE;	441	end -= SOCKETBUFSIZE;
		442
319	avail = SOCKETBUFSIZE - end;	443	avail = SOCKETBUFSIZE - end;
320		444
321	/* We can all fit it behind the current data without wrapping */	445	/* We can all fit it behind the current data without wrapping */
322	if (avail >= len)	446	if (avail >= len)
323	{
324	memcpy (ns->outputbuffer.data + end, buf, len);	447	memcpy (outputbuffer.data + end, buf, len);
325	}
326	else	448	else
327	{	449	{
328	memcpy (ns->outputbuffer.data + end, buf, avail);	450	memcpy (outputbuffer.data + end, buf, avail);
329	memcpy (ns->outputbuffer.data, buf + avail, len - avail);	451	memcpy (outputbuffer.data, buf + avail, len - avail);
330	}	452	}
		453
331	ns->outputbuffer.len += len;	454	outputbuffer.len += len;
332	#if 0
333	LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
334	#endif
335	}	455	}
336
337	/**
338	* Writes data to socket.
339	*
340	* When the socket is clear to write, and we have backlogged data, this
341	* is called to write it out.
342	*/
343	void
344	write_socket_buffer (NewSocket * ns)
345	{
346	int amt, max;
347
348	if (ns->outputbuffer.len == 0)
349	{
350	LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
351	return;
352	}
353
354	do
355	{
356	max = SOCKETBUFSIZE - ns->outputbuffer.start;
357	if (ns->outputbuffer.len < max)
358	max = ns->outputbuffer.len;
359
360	#ifdef WIN32 /* **win32 write_socket_buffer: change write() to send() /
361	amt = send (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max, 0);
362	#else
363	do
364	{
365	amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
366	}
367	while ((amt < 0) && (errno == EINTR));
368	#endif
369
370	if (amt < 0)
371	{ /* We got an error */
372
373	#ifdef WIN32 /* **win32 write_socket_buffer: change error handling /
374	if (amt == -1 && WSAGetLastError () != WSAEWOULDBLOCK)
375	{
376	LOG (llevError, "New socket write failed (wsb) (%d).\n", WSAGetLastError ());
377	#else
378	if (errno != EWOULDBLOCK)
379	{
380	LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
381	#endif
382	ns->status = Ns_Dead;
383	return;
384	}
385	else
386	{ /* EWOULDBLOCK */
387	/* can't write it, so store it away. */
388	ns->can_write = 0;
389	return;
390	}
391	}
392	ns->outputbuffer.start += amt;
393	/* wrap back to start of buffer */
394	if (ns->outputbuffer.start == SOCKETBUFSIZE)
395	ns->outputbuffer.start = 0;
396	ns->outputbuffer.len -= amt;
397	#ifdef CS_LOGSTATS
398	cst_tot.obytes += amt;
399	cst_lst.obytes += amt;
400	#endif
401	}
402	while (ns->outputbuffer.len > 0);
403	}
404
405	/**
406	* This writes data to the socket. - It is very low level -
407	* all we try and do is write out the data to the socket
408	* provided (ns). buf is the data to write, len is the number
409	* of bytes to write. IT doesn't return anything - rather, it
410	* updates the ns structure if we get an error.
411	*/
412	void
413	Write_To_Socket (NewSocket * ns, char *buf, int len)
414	{
415	int amt = 0;
416	char *pos = buf;
417
418	if (ns->status == Ns_Dead \|\| !buf)
419	{
420	LOG (llevDebug, "Write_To_Socket called with dead socket\n");
421	return;
422	}
423
424	#ifndef __GNU__ /* This caused problems on Hurd */
425	if (!ns->can_write)
426	{
427	add_to_buffer (ns, buf, len);
428	return;
429	}
430	#endif
431	/* If we manage to write more than we wanted, take it as a bonus */
432	while (len > 0)
433	{
434
435	#ifdef WIN32 /* **win32 Write_To_Socket: change write() to send() /
436	amt = send (ns->fd, pos, len, 0);
437	#else
438	do
439	{
440	amt = write (ns->fd, pos, len);
441	}
442	while ((amt < 0) && (errno == EINTR));
443	#endif
444
445	if (amt < 0)
446	{ /* We got an error */
447	#ifdef WIN32 /* **win32 Write_To_Socket: change error handling /
448	if (amt == -1 && WSAGetLastError () != WSAEWOULDBLOCK)
449	{
450	LOG (llevError, "New socket write failed WTS (%d).\n", WSAGetLastError ());
451	#else
452	if (errno != EWOULDBLOCK)
453	{
454	LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
455	errno, strerror (errno));
456	#endif
457	ns->status = Ns_Dead;
458	return;
459	}
460	else
461	{ /* EWOULDBLOCK */
462	/* can't write it, so store it away. */
463	add_to_buffer (ns, pos, len);
464	ns->can_write = 0;
465	return;
466	}
467	}
468	/* amt gets set to 0 above in blocking code, so we do this as
469	* an else if to make sure we don't reprocess it.
470	*/
471	else if (amt == 0)
472	{
473	LOG (llevError, "Write_To_Socket: No data written out.\n");
474	}
475	len -= amt;
476	pos += amt;
477	#ifdef CS_LOGSTATS
478	cst_tot.obytes += amt;
479	cst_lst.obytes += amt;
480	#endif
481	}
482	}
483
484		456
485	/**	457	/**
486	* Takes a string of data, and writes it out to the socket. A very handy	458	* Takes a string of data, and writes it out to the socket. A very handy
487	* shortcut function.	459	* shortcut function.
488	*/	460	*/
489	void	461	void
490	cs_write_string (NewSocket * ns, const char *buf, int len)	462	client::send_packet (packet &sl)
491	{	463	{
492	SockList sl;	464	if (destroyed ())
493
494	sl.len = len;
495	sl.buf = (unsigned char *) buf;
496	Send_With_Handling (ns, &sl);
497	}
498
499
500	/**
501	* Calls Write_To_Socket to send data to the client.
502	*
503	* The only difference in this function is that we take a SockList
504	*, and we prepend the length information.
505	*/
506	void
507	Send_With_Handling (NewSocket * ns, SockList * msg)
508	{
509	unsigned char sbuf[4];
510
511	if (ns->status == Ns_Dead \|\| !msg)
512	return;	465	return;
513		466
514	if (msg->len >= MAXSOCKBUF)	467	if (sl.length () >= MAXSOCKBUF)
515	{	468	{
516	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len);	469	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
517	/* Almost certainly we've overflowed a buffer, so quite now to make	470	/* Almost certainly we've overflowed a buffer, so quit now to make
518	* it easier to debug.	471	* it easier to debug.
519	*/	472	*/
520	abort ();	473	abort ();
521	}	474	}
522	sbuf[0] = ((uint32) (msg->len) >> 8) & 0xFF;
523	sbuf[1] = ((uint32) (msg->len)) & 0xFF;
524	if (ns->status != Ns_Old)
525	Write_To_Socket (ns, (char *) sbuf, 2);
526	Write_To_Socket (ns, (char *) msg->buf, msg->len);
527	}
528		475
529	/**	476	if (!sl.length ())
530	* Takes a string of data, and writes it out to the socket. A very handy	477	return;
531	* shortcut function.
532	*/
533	void
534	Write_String_To_Socket (NewSocket * ns, char *buf, int len)
535	{
536	SockList sl;
537		478
538	sl.len = len;	479	assert (sl.hdrlen == 2);
539	sl.buf = (unsigned char *) buf;
540	Send_With_Handling (ns, &sl);
541	}
542		480
		481	sl.buf_ [0] = sl.length () >> 8;
		482	sl.buf_ [1] = sl.length () ;
543		483
		484	send (sl.buf_, sl.length () + sl.hdrlen);
		485	}
		486
		487	void
		488	client::send_packet (const char *buf, int len)
		489	{
		490	packet sl;
		491
		492	sl << data (buf, len);
		493	send_packet (sl);
		494	}
		495
		496	void
		497	client::send_packet (const char *buf)
		498	{
		499	send_packet (buf, strlen (buf));
		500	}
		501
		502	void
		503	client::send_packet_printf (const char *format, ...)
		504	{
		505	packet sl;
		506
		507	va_list ap;
		508	va_start (ap, format);
		509	sl.vprintf (format, ap);
		510	va_end (ap);
		511
		512	send_packet (sl);
		513	}
		514
		515	// returns true when the message needs special (read: perl) treatment
		516	static bool
		517	msg_is_special (const char *msg)
		518	{
		519	return msg [strcspn (msg, "<[&\n")];
		520	}
		521
		522	void
		523	client::send_msg (int color, const char type, const char msg)
		524	{
		525	if (msg_is_special (msg))
		526	cfperl_send_msg (this, color, type, msg);
		527	else if (can_msg)
		528	send_packet_printf ("msg %d %s %s", color, type, msg);
		529	else if (color < 0)
		530	return; // client cannot handle this
		531	else
		532	send_packet_printf ("drawinfo %d %s", color, msg);
		533	}
		534
		535	void
		536	client::send_drawinfo (const char *msg, int flags)
		537	{
		538	send_msg (flags, "log", msg);
		539	}
		540
544	/******************************************************************************	541	/***********************************************************************
545	*	542	*
546	* statistics logging functions.	543	* packet functions/utilities
547	*	544	*
548	******************************************************************************/	545	**********************************************************************/
549		546
550	#ifdef CS_LOGSTATS	547	packet::packet (const char *name)
551
552	/* cst_tot is for the life of the server, cst_last is for the last series of
553	* stats
554	*/
555	CS_Stats cst_tot, cst_lst;
556
557	/**
558	* Writes out the gathered stats. We clear cst_lst.
559	*/
560	void
561	write_cs_stats (void)
562	{	548	{
563	time_t now = time (NULL);	549	reset ();
564		550
565	/* If no connections recently, don't both to log anything */	551	int len = strlen (name);
566	if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)	552	memcpy (cur, name, len); cur += len;
567	return;	553	*cur++ = ' ';
568
569	/* CSSTAT is put in so scripts can easily find the line */
570	LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
571	ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
572	now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
573	cst_lst.ibytes = 0;
574	cst_lst.obytes = 0;
575	cst_lst.max_conn = socket_info.nconns;
576	cst_lst.time_start = now;
577	}	554	}
578	#endif	555
		556	packet &packet::operator <<(const ber32 v)
		557	{
		558	enum { maxlen = 32 / 7 + 1};
		559	uint8 buf[maxlen];
		560	uint8 *p = buf + maxlen;
		561	uint32 val = v.val;
		562
		563	*--p = val & 0x7F;
		564
		565	while (val > 0x7F)
		566	{
		567	val >>= 7;
		568	*--p = (val & 0x7F) \| 0x80;
		569	}
		570
		571	return *this << data (p, buf + maxlen - p);
		572	}
		573
		574	packet &packet::operator <<(const data &v)
		575	{
		576	if (room () < v.len)
		577	reset ();
		578	else
		579	{
		580	if (v.len)
		581	{
		582	memcpy (cur, v.ptr, v.len);
		583	cur += v.len;
		584	}
		585	}
		586
		587	return *this;
		588	}
		589
		590	packet &packet::operator <<(const data8 &v)
		591	{
		592	unsigned int len = min (v.len, 0x00FF);
		593	return *this << uint8 (len) << data (v.ptr, len);
		594	}
		595
		596	packet &packet::operator <<(const data16 &v)
		597	{
		598	unsigned int len = min (v.len, 0xFFFF);
		599	return *this << uint16 (len) << data (v.ptr, len);
		600	}
		601
		602	packet &packet::operator <<(const char *v)
		603	{
		604	return *this << data (v, strlen (v ? v : 0));
		605	}
		606
		607	void
		608	packet::vprintf (const char *format, va_list ap)
		609	{
		610	int size = room ();
		611
		612	int len = vsnprintf ((char *)cur, size, format, ap);
		613
		614	if (len >= size)
		615	return reset ();
		616
		617	cur += len;
		618	}
		619

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Comparing deliantra/server/socket/lowlevel.C (file contents): Revision 1.5 by root, Sun Sep 10 13:43:33 2006 UTC vs. Revision 1.49 by root, Sun Jul 1 05:00:20 2007 UTC

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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.5 by root, Sun Sep 10 13:43:33 2006 UTC vs.
Revision 1.49 by root, Sun Jul 1 05:00:20 2007 UTC