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

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.7 by root, Sun Nov 26 19:48:50 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;
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	39	#endif
82	}
83		40
84	/***********************************************************************	41	// disconnect a socket after this many seconds without an ack
85	*	42	#define SOCKET_TIMEOUT 8.
86	* SockList functions/utilities
87	*
88	**********************************************************************/
89		43
90	void	44	// force a packet when idle for more than this many seconds,
91	SockList_Init (SockList * sl)	45	// forcing an ack regularly.
92	{	46	#define IDLE_PING 2.
93	sl->len = 0;
94	sl->buf = NULL;
95	}
96		47
97	void	48	void
98	SockList_AddInt (SockList * sl, uint32 data)	49	client::flush ()
99	{	50	{
100	sl->buf[sl->len++] = (data >> 24) & 0xff;	51	if (destroyed ())
101	sl->buf[sl->len++] = (data >> 16) & 0xff;	52	return;
102	sl->buf[sl->len++] = (data >> 8) & 0xff;
103	sl->buf[sl->len++] = data & 0xff;
104	}
105		53
106	void	54	# if HAVE_SIOCOUTQ
107	SockList_AddInt64 (SockList * sl, uint64 data)	55	{
108	{	56	int value;
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		57
114	sl->buf[sl->len++] = (char) ((data >> 24) & 0xff);	58	if (!ioctl (fd, SIOCOUTQ, &value))
115	sl->buf[sl->len++] = (char) ((data >> 16) & 0xff);	59	outq = value;
116	sl->buf[sl->len++] = (char) ((data >> 8) & 0xff);	60	}
117	sl->buf[sl->len++] = (char) (data & 0xff);	61	# endif
118	}
119		62
120	/* Basically does the reverse of SockList_AddInt, but on	63	#if HAVE_TCP_INFO
121	* strings instead. Same for the GetShort, but for 16 bits.	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)
		67	{
		68	// check time of last ack, and, if too old, kill connection
		69	struct tcp_info tcpi;
		70	socklen_t len = sizeof (tcpi);
		71
		72	if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
		73	{
		74	if (tcpi.tcpi_snd_mss)
		75	mss = tcpi.tcpi_snd_mss;
		76
		77	rtt = tcpi.tcpi_rtt;
		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	#ifdef WIN32 /* **WIN32 SockList_ReadPacket: change read() to recv() /
163		267
164	stat = recv (fd, sl->buf + sl->len, 2 - sl->len, 0);	268	if (len > 4 && !strncmp (data, "say " , 4))
		269	return true;
		270	if (len > 5 && !strncmp (data, "chat ", 5))
		271	return true;
165		272
166	#else	273	return false;
167	do	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))
168	{	329	{
169	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)
170	}	375	{
171	while ((stat == -1) && (errno == EINTR));	376	// input buffer full
172	#endif	377	socket_ev.poll (socket_ev.poll () & ~PE_R);
173	if (stat < 0)	378	return;
174	{	379	}
175	/* In non blocking mode, EAGAIN is set when there is no	380
176	* data available.	381	amount = read (fd, inbuf + inbuf_len, amount);
177	*/	382
178	#ifdef WIN32 /* **WIN32 SockList_ReadPacket: error handling for win32 /	383	if (!amount)
179	if ((stat == -1) && WSAGetLastError () != WSAEWOULDBLOCK)	384	{
		385	destroy ();
		386	return;
		387	}
		388	else if (amount < 0)
		389	{
		390	if (errno != EAGAIN && errno != EINTR)
180	{	391	{
181	if (WSAGetLastError () == WSAECONNRESET)	392	LOG (llevError, "read error: %s\n", strerror (errno));
182	LOG (llevDebug, "Connection closed by client\n");	393	destroy ();
183	else	394	return;
184	{
185	LOG (llevDebug, "ReadPacket got error %d, returning 0\n", WSAGetLastError ());
186	}
187	return -1; /* kick this user! */
188	}	395	}
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		396
224	/* return error so the socket is closed */	397	// 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	{	398	}
234	stat = read (fd, sl->buf + sl->len, toread);	399	else
235	}	400	{
236	while ((stat < 0) && (errno == EINTR));	401	inbuf_len += amount;
237	#endif	402
238	if (stat < 0)	403	cmd_ev.start ();
239	{	404	}
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	}	405	}
276	while (toread > 0);	406	}
277	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 ();
278	}	416	}
279		417
280	/*******************************************************************************	418	/*******************************************************************************
281	*	419	*
282	* Start of write related routines.	420	* Start of write related routines.
287	* Adds data to a socket buffer for whatever reason.	425	* Adds data to a socket buffer for whatever reason.
288	*	426	*
289	* 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
290	* data, and len is the number of bytes to add.	428	* data, and len is the number of bytes to add.
291	*/	429	*/
292		430	void
293	static void	431	client::send (void *buf_, int len)
294	add_to_buffer (NewSocket * ns, char *buf, int len)
295	{	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
296	int avail, end;	447	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		448
305	/* 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
306	* currently in use is actually data + end -1	450	* currently in use is actually data + end -1
307	*/	451	*/
308
309	end = ns->outputbuffer.start + ns->outputbuffer.len;	452	end = outputbuffer.start + outputbuffer.len;
310	/* The buffer is already in a wrapped state, so adjust end */	453	/* The buffer is already in a wrapped state, so adjust end */
311	if (end >= SOCKETBUFSIZE)	454	if (end >= SOCKETBUFSIZE)
312	end -= SOCKETBUFSIZE;	455	end -= SOCKETBUFSIZE;
313		456
314	avail = SOCKETBUFSIZE - end;	457	avail = SOCKETBUFSIZE - end;
315		458
316	/* We can all fit it behind the current data without wrapping */	459	/* We can all fit it behind the current data without wrapping */
317	if (avail >= len)	460	if (avail >= len)
318	memcpy (ns->outputbuffer.data + end, buf, len);	461	memcpy (outputbuffer.data + end, buf, len);
319	else	462	else
320	{	463	{
321	memcpy (ns->outputbuffer.data + end, buf, avail);	464	memcpy (outputbuffer.data + end, buf, avail);
322	memcpy (ns->outputbuffer.data, buf + avail, len - avail);	465	memcpy (outputbuffer.data, buf + avail, len - avail);
323	}	466	}
324		467
325	ns->outputbuffer.len += len;	468	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	}	469	}
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		470
479	/**	471	/**
480	* 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
481	* shortcut function.	473	* shortcut function.
482	*/	474	*/
483	void	475	void
484	cs_write_string (NewSocket * ns, const char *buf, int len)	476	client::send_packet (packet &sl)
485	{	477	{
486	SockList sl;	478	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;	479	return;
507		480
508	if (msg->len >= MAXSOCKBUF)	481	if (sl.length () >= MAXSOCKBUF)
509	{	482	{
510	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 ());
511	/* 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
512	* it easier to debug.	485	* it easier to debug.
513	*/	486	*/
514	abort ();	487	abort ();
515	}	488	}
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		489
523	/**	490	if (!sl.length ())
524	* Takes a string of data, and writes it out to the socket. A very handy	491	return;
525	* shortcut function.
526	*/
527	void
528	Write_String_To_Socket (NewSocket * ns, char *buf, int len)
529	{
530	SockList sl;
531		492
532	sl.len = len;	493	assert (sl.hdrlen == 2);
533	sl.buf = (unsigned char *) buf;
534	Send_With_Handling (ns, &sl);
535	}
536		494
		495	sl.buf_ [0] = sl.length () >> 8;
		496	sl.buf_ [1] = sl.length () ;
537		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
538	/******************************************************************************	555	/***********************************************************************
539	*	556	*
540	* statistics logging functions.	557	* packet functions/utilities
541	*	558	*
542	******************************************************************************/	559	**********************************************************************/
543		560
544	#ifdef CS_LOGSTATS	561	packet::packet (const char *name)
545
546	/* cst_tot is for the life of the server, cst_last is for the last series of
547	* stats
548	*/
549	CS_Stats cst_tot, cst_lst;
550
551	/**
552	* Writes out the gathered stats. We clear cst_lst.
553	*/
554	void
555	write_cs_stats (void)
556	{	562	{
557	time_t now = time (NULL);	563	reset ();
558		564
559	/* If no connections recently, don't both to log anything */	565	int len = strlen (name);
560	if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)	566	memcpy (cur, name, len); cur += len;
561	return;	567	*cur++ = ' ';
562
563	/* CSSTAT is put in so scripts can easily find the line */
564	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,
566	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;
568	cst_lst.obytes = 0;
569	cst_lst.max_conn = socket_info.nconns;
570	cst_lst.time_start = now;
571	}	568	}
572	#endif	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 1.7 by root, Sun Nov 26 19:48:50 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 1.7 by root, Sun Nov 26 19:48:50 2006 UTC vs.
Revision 1.50 by root, Thu Jul 12 19:36:58 2007 UTC