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

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.17 by root, Thu Dec 14 04:30:33 2006 UTC vs.
Revision 1.42 by root, Mon May 28 21:22:26 2007 UTC

…		…
1	/*	1	/*
2	CrossFire, A Multiplayer game for X-windows	2	* This file is part of Crossfire TRT, the Multiplayer Online Role Playing Game.
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 it
7	it under the terms of the GNU General Public License as published by	8	* under the terms of the GNU General Public License as published by the Free
8	the Free Software Foundation; either version 2 of the License, or	9	* Software Foundation; either version 2 of the License, or (at your option)
9	(at your option) any later version.	10	* 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, but
12	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14	GNU General Public License for more details.	15	* 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 along
17	along with this program; if not, write to the Free Software	18	* with Crossfire TRT; if not, write to the Free Software Foundation, Inc. 51
18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.	19	* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19		20	*
20	The author can be reached via e-mail to mark@pyramid.com	21	* The authors can be reached via e-mail to <crossfire@schmorp.de>
21	*/	22	*/
22		23
23	/**	24	/**
24	* \file	25	* \file
25	* Low-level socket-related functions.	26	* Low-level socket-related functions.
26	*	27	*
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	#include <cstdarg>
41		41
42	#ifdef __linux__	42	#ifdef __linux__
43	# include <sys/types.h>	43	# include <sys/types.h>
44	# include <sys/socket.h>	44	# include <sys/socket.h>
45	# include <netinet/in.h>	45	# include <netinet/in.h>
46	# define TCP_HZ 1000 // sorry...
47	# include <netinet/tcp.h>	46	# include <netinet/tcp.h>
48	#endif	47	#endif
49		48
50	// 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
51	// easily die in 20 seconds...	50	// easily die in 20 seconds...
52	#define SOCKET_TIMEOUT1 10	51	#define SOCKET_TIMEOUT1 10 * 1000
53	#define SOCKET_TIMEOUT2 20	52	#define SOCKET_TIMEOUT2 20 * 1000
54		53
55	void	54	void
56	Socket_Flush (client_socket * ns)	55	client::flush ()
57	{	56	{
		57	if (destroyed ())
		58	return;
		59
58	#ifdef __linux__	60	#ifdef __linux__
59	// check time of last ack, and, if too old, kill connection	61	// check time of last ack, and, if too old, kill connection
60	struct tcp_info tcpi;	62	struct tcp_info tcpi;
61	socklen_t len = sizeof (tcpi);	63	socklen_t len = sizeof (tcpi);
62		64
63	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))
64	{	66	{
65	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;
66		68
		69	rtt = tcpi.tcpi_rtt;
		70	rttvar = tcpi.tcpi_rttvar;
		71
67	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
68	&& 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
69	{	74	{
70	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,
71	(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);
72	ns->status = Ns_Dead;	77	destroy ();
73	}	78	}
74	}	79	}
75
76	int val;
77
78	val = 0; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
79	val = 1; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
80	#endif	80	#endif
81	}
82		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
83	/***********************************************************************	178	/*****************************************************************************
84	*	179	* Start of command dispatch area.
85	* packet functions/utilities	180	* The commands here are protocol commands.
86	*
87	**********************************************************************/	181	****************************************************************************/
88		182
89	packet &packet::operator <<(const data &v)	183	// SocketCommand, PlayingCommand, should not exist with those ugly casts
		184	#define SC(cb) (void )static_cast<void ()(char , int, client )>(cb),
		185	#define PC(cb) (void )static_cast<void ()(char , int, player )>(cb), PF_PLAYER \|
		186
		187	/**
		188	* Dispatch table for the server.
		189	*/
		190	static struct packet_type packets[] = {
		191	{"ncom", PC(NewPlayerCmd) PF_PLAYING \| PF_COMMAND6 },
		192	{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND0 },
		193
		194	{"examine", PC(ExamineCmd) PF_PLAYING },
		195	{"ex", PC(ExCmd) PF_PLAYING },
		196	{"apply", PC(ApplyCmd) PF_PLAYING },
		197	{"lookat", PC(LookAt) PF_PLAYING },
		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+
		204
		205	{"reply", SC(ReplyCmd) 0 },
		206	{"exti", SC(ExtiCmd) 0 }, // CF+
		207	{"addme", SC(AddMeCmd) 0 },
		208	{"askface", SC(AskFaceCmd) 0 },
		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	};
		218
		219	bool
		220	client::may_execute (const packet_type *pkt) const
90	{	221	{
91	if (room () < v.len)	222	return (!(pkt->flags & PF_PLAYER) \|\| pl)
92	reset ();	223	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
		224	}
		225
		226	// HACK: some commands currently should be executed
		227	// even when the player is frozen. this hack detects
		228	// those commands. it should be folded into may_execute,
		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)
		241	{
		242	data += 6;
		243	len -= 6;
		244	}
		245
		246	if (len > 4 && !strncmp (data, "say " , 4))
		247	return true;
		248	if (len > 5 && !strncmp (data, "chat ", 5))
		249	return true;
		250
		251	return false;
		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	}
93	else	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;
94	{	282	}
95	if (v.len)	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))
96	{	307	{
97	memcpy (cur, v.ptr, v.len);	308	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
98	cur += v.len;	309	queue_command (pkt, data, datalen);
		310	else
		311	execute (pkt, data, datalen);
		312
		313	goto next_packet;
99	}	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 ())
100	}	333	{
101		334	socket_ev.poll (0);
102	return *this;	335	return;
103	}
104
105	packet &packet::operator <<(const data8 &v)
106	{
107	unsigned int len = min (v.len, 0x00FF);
108	return *this << uint8 (len) << data (v.ptr, len);
109	}
110
111	packet &packet::operator <<(const data16 &v)
112	{
113	unsigned int len = min (v.len, 0xFFFF);
114	return *this << uint16 (len) << data (v.ptr, len);
115	}
116
117	packet &packet::operator <<(const char *v)
118	{
119	return *this << data (v, strlen (v ? v : 0));
120	}
121
122	void
123	packet::printf (const char *format, ...)
124	{
125	int size = room ();
126
127	va_list ap;
128	va_start (ap, format);
129	int len = vsnprintf ((char *)cur, size, format, ap);
130	va_end (ap);
131
132	if (len >= size)
133	return reset ();
134
135	cur += len;
136	}
137
138	/******************************************************************************
139	*
140	* Start of read routines.
141	*
142	******************************************************************************/
143
144	int
145	client_socket::read_packet ()
146	{
147	for (;;)
148	{	336	}
149	if (inbuf_len >= 2)
150	{
151	unsigned int pkt_len = (inbuf [0] << 8) \| inbuf [1];
152		337
153	if (inbuf_len >= 2 + pkt_len)	338	if (got & PE_W)
154	return pkt_len + 2;	339	{
155	}	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
156		349
157	int amount = sizeof (inbuf) - inbuf_len;	350	int amount = sizeof (inbuf) - inbuf_len;
158		351
159	if (amount <= 0)	352	if (!amount)
160	{	353	{
161	LOG (llevError, "packet too large");//TODO	354	// input buffer full
		355	socket_ev.poll (socket_ev.poll () & ~PE_R);
162	return -1;	356	return;
163	}	357	}
164		358
165	amount = read (fd, inbuf + inbuf_len, amount);	359	amount = read (fd, inbuf + inbuf_len, amount);
166		360
167	if (!amount)	361	if (!amount)
168	{	362	{
169	status = Ns_Dead;	363	destroy ();
170	return -1;	364	return;
171	}	365	}
172	else if (amount < 0)	366	else if (amount < 0)
173	{	367	{
174	if (errno != EAGAIN && errno != EINTR)	368	if (errno != EAGAIN && errno != EINTR)
175	{	369	{
176	LOG (llevError, "read error: %s", strerror (errno));	370	LOG (llevError, "read error: %s\n", strerror (errno));
		371	destroy ();
177	return -1;	372	return;
178	}	373	}
179		374
180	return 0;	375	// should not be here, normally
		376	}
		377	else
181	}	378	{
182
183	inbuf_len += amount;	379	inbuf_len += amount;
184		380
185	cst_tot.ibytes += amount;	381	cst_tot.ibytes += amount;
186	cst_lst.ibytes += amount;	382	cst_lst.ibytes += amount;
187	}
188	}
189		383
		384	cmd_ev.start ();
		385	}
		386	}
		387	}
		388
		389	// called whenever we have additional commands to process
190	void	390	void
191	client_socket::skip_packet (int len)	391	client::cmd_cb (iw &w)
192	{	392	{
193	inbuf_len -= len;	393	if (handle_packet ())
194	memmove (inbuf, inbuf + len, inbuf_len);	394	w.start ();
		395	else
		396	flush ();
195	}	397	}
196		398
197	/*******************************************************************************	399	/*******************************************************************************
198	*	400	*
199	* Start of write related routines.	401	* Start of write related routines.
…		…
204	* Adds data to a socket buffer for whatever reason.	406	* Adds data to a socket buffer for whatever reason.
205	*	407	*
206	* 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
207	* data, and len is the number of bytes to add.	409	* data, and len is the number of bytes to add.
208	*/	410	*/
209		411	void
210	static void	412	client::send (void *buf_, int len)
211	add_to_buffer (client_socket ns, char buf, int len)
212	{	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
213	int avail, end;	428	int avail, end;
214
215	if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
216	{
217	LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
218	ns->status = Ns_Dead;
219	return;
220	}
221		429
222	/* 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
223	* currently in use is actually data + end -1	431	* currently in use is actually data + end -1
224	*/	432	*/
225
226	end = ns->outputbuffer.start + ns->outputbuffer.len;	433	end = outputbuffer.start + outputbuffer.len;
227	/* The buffer is already in a wrapped state, so adjust end */	434	/* The buffer is already in a wrapped state, so adjust end */
228	if (end >= SOCKETBUFSIZE)	435	if (end >= SOCKETBUFSIZE)
229	end -= SOCKETBUFSIZE;	436	end -= SOCKETBUFSIZE;
230		437
231	avail = SOCKETBUFSIZE - end;	438	avail = SOCKETBUFSIZE - end;
232		439
233	/* We can all fit it behind the current data without wrapping */	440	/* We can all fit it behind the current data without wrapping */
234	if (avail >= len)	441	if (avail >= len)
235	memcpy (ns->outputbuffer.data + end, buf, len);	442	memcpy (outputbuffer.data + end, buf, len);
236	else	443	else
237	{	444	{
238	memcpy (ns->outputbuffer.data + end, buf, avail);	445	memcpy (outputbuffer.data + end, buf, avail);
239	memcpy (ns->outputbuffer.data, buf + avail, len - avail);	446	memcpy (outputbuffer.data, buf + avail, len - avail);
240	}	447	}
241		448
242	ns->outputbuffer.len += len;	449	outputbuffer.len += len;
243	#if 0
244	LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
245	#endif
246	}
247
248	/**
249	* Writes data to socket.
250	*
251	* When the socket is clear to write, and we have backlogged data, this
252	* is called to write it out.
253	*/
254	void
255	write_socket_buffer (client_socket * ns)
256	{
257	int amt, max;
258
259	if (ns->outputbuffer.len == 0)
260	{
261	LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
262	return;
263	}
264
265	do
266	{
267	max = SOCKETBUFSIZE - ns->outputbuffer.start;
268	if (ns->outputbuffer.len < max)
269	max = ns->outputbuffer.len;
270
271	do
272	{
273	amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
274	}
275	while ((amt < 0) && (errno == EINTR));
276
277	if (amt < 0)
278	{ /* We got an error */
279
280	if (errno != EWOULDBLOCK)
281	{
282	LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
283	ns->status = Ns_Dead;
284	return;
285	}
286	else
287	{ /* EWOULDBLOCK */
288	/* can't write it, so store it away. */
289	ns->can_write = 0;
290	return;
291	}
292	}
293	ns->outputbuffer.start += amt;
294	/* wrap back to start of buffer */
295	if (ns->outputbuffer.start == SOCKETBUFSIZE)
296	ns->outputbuffer.start = 0;
297	ns->outputbuffer.len -= amt;
298	#ifdef CS_LOGSTATS
299	cst_tot.obytes += amt;
300	cst_lst.obytes += amt;
301	#endif
302	}
303	while (ns->outputbuffer.len > 0);
304	}
305
306	/**
307	* This writes data to the socket. - It is very low level -
308	* all we try and do is write out the data to the socket
309	* provided (ns). buf is the data to write, len is the number
310	* of bytes to write. IT doesn't return anything - rather, it
311	* updates the ns structure if we get an error.
312	*/
313	void
314	client_socket::send (void *buf_, int len)
315	{
316	char buf = (char )buf_;
317	char *pos = buf;
318	int amt = 0;
319
320	if (status == Ns_Dead \|\| !buf)
321	{
322	LOG (llevDebug, "Write_To_Socket called with dead socket\n");
323	return;
324	}
325
326	#ifndef __GNU__ /* This caused problems on Hurd */
327	if (!can_write)
328	{
329	add_to_buffer (this, buf, len);
330	return;
331	}
332	#endif
333
334	/* If we manage to write more than we wanted, take it as a bonus */
335	while (len > 0)
336	{
337	do
338	{
339	amt = write (fd, pos, len);
340	}
341	while ((amt < 0) && (errno == EINTR));
342
343	if (amt < 0)
344	{ /* We got an error */
345	if (errno != EWOULDBLOCK)
346	{
347	LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
348	errno, strerror (errno));
349	status = Ns_Dead;
350	return;
351	}
352	else
353	{ /* EWOULDBLOCK */
354	/* can't write it, so store it away. */
355	add_to_buffer (this, pos, len);
356	can_write = 0;
357	return;
358	}
359	}
360	/* amt gets set to 0 above in blocking code, so we do this as
361	* an else if to make sure we don't reprocess it.
362	*/
363	else if (amt == 0)
364	LOG (llevError, "Write_To_Socket: No data written out.\n");
365
366	len -= amt;
367	pos += amt;
368	#ifdef CS_LOGSTATS
369	cst_tot.obytes += amt;
370	cst_lst.obytes += amt;
371	#endif
372	}
373	}	450	}
374		451
375	/**	452	/**
376	* 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
377	* shortcut function.	454	* shortcut function.
378	*/	455	*/
379
380	void	456	void
381	client_socket::send_packet (packet &sl)	457	client::send_packet (packet &sl)
382	{	458	{
383	Send_With_Handling (this, &sl);	459	if (destroyed ())
384	}
385
386	void
387	client_socket::send_packet (const char *buf, int len)
388	{
389	packet sl;
390
391	sl << data (buf, len);
392	send_packet (sl);
393	}
394
395	void
396	client_socket::send_packet (const char *buf)
397	{
398	send_packet (buf, strlen (buf));
399	}
400
401	/**
402	* Calls Write_To_Socket to send data to the client.
403	*
404	* The only difference in this function is that we take a packet
405	*, and we prepend the length information.
406	*/
407	void
408	Send_With_Handling (client_socket ns, packet msg)
409	{
410	unsigned char sbuf[4];
411
412	if (ns->status == Ns_Dead \|\| !msg)
413	return;	460	return;
414		461
415	if (msg->length () >= MAXSOCKBUF)	462	if (sl.length () >= MAXSOCKBUF)
416	{	463	{
417	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->length ());	464	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
418	/* 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
419	* it easier to debug.	466	* it easier to debug.
420	*/	467	*/
421	abort ();	468	abort ();
422	}	469	}
423		470
424	sbuf[0] = ((uint32) (msg->length ()) >> 8);	471	if (!sl.length ())
425	sbuf[1] = ((uint32) (msg->length ()) );	472	return;
426		473
427	if (ns->status != Ns_Old)	474	assert (sl.hdrlen == 2);
428	ns->send (sbuf, 2);
429		475
430	ns->send (msg->buf, msg->length ());	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	/***********************************************************************
		533	*
		534	* packet functions/utilities
		535	*
		536	**********************************************************************/
		537
		538	packet::packet (const char *name)
		539	{
		540	reset ();
		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;
431	}	609	}
432		610
433	/******************************************************************************	611	/******************************************************************************
434	*	612	*
435	* statistics logging functions.	613	* statistics logging functions.

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Comparing deliantra/server/socket/lowlevel.C (file contents): Revision 1.17 by root, Thu Dec 14 04:30:33 2006 UTC vs. Revision 1.42 by root, Mon May 28 21:22:26 2007 UTC

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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.17 by root, Thu Dec 14 04:30:33 2006 UTC vs.
Revision 1.42 by root, Mon May 28 21:22:26 2007 UTC