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

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.18 by root, Thu Dec 14 05:09:32 2006 UTC vs.
Revision 1.32 by pippijn, Sat Jan 20 13:47:17 2007 UTC

…		…
1	/*	1	/*
2	CrossFire, A Multiplayer game for X-windows	2	* CrossFire, A Multiplayer game for X-windows
3		3	*
		4	* Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team
4	Copyright (C) 1992 Frank Tore Johansen	5	* Copyright (C) 1992 Frank Tore Johansen
5		6	*
6	This program is free software; you can redistribute it and/or modify	7	* This program is free software; you can redistribute it and/or modify
7	it under the terms of the GNU General Public License as published by	8	* it under the terms of the GNU General Public License as published by
8	the Free Software Foundation; either version 2 of the License, or	9	* the Free Software Foundation; either version 2 of the License, or
9	(at your option) any later version.	10	* (at your option) any later version.
10		11	*
11	This program is distributed in the hope that it will be useful,	12	* This program is distributed in the hope that it will be useful,
12	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	GNU General Public License for more details.	15	* GNU General Public License for more details.
15		16	*
16	You should have received a copy of the GNU General Public License	17	* You should have received a copy of the GNU General Public License
17	along with this program; if not, write to the Free Software	18	* along with this program; if not, write to the Free Software
18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.	19	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19		20	*
20	The author can be reached via e-mail to mark@pyramid.com	21	* The author can be reached via e-mail to mark@pyramid.com
21	*/	22	*/
22		23
23	/**	24	/**
24	* \file	25	* \file
25	* Low-level socket-related functions.	26	* Low-level socket-related functions.
26	*	27	*
27	* \date 2003-12-02	28	* \date 2003-12-02
33	*/	34	*/
34		35
35	using namespace std;	36	using namespace std;
36		37
37	#include <global.h>	38	#include <global.h>
38	#include <newclient.h>
39	#include <sproto.h>	39	#include <sproto.h>
40	#include <cstdarg>	40	#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	/**
		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
		178	/*****************************************************************************
		179	* Start of command dispatch area.
		180	* The commands here are protocol commands.
		181	****************************************************************************/
		182
		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 },
		192	{"command", PC(PlayerCmd) PF_PLAYING },
		193
		194	{"examine", PC(ExamineCmd) PF_PLAYING },
		195	{"apply", PC(ApplyCmd) PF_PLAYING },
		196	{"lookat", PC(LookAt) PF_PLAYING },
		197	{"lock", PC(LockItem) PF_PLAYING },
		198	{"mark", PC(MarkItem) PF_PLAYING },
		199	{"move", PC(MoveCmd) PF_PLAYING },
		200	{"ext", PC(ExtCmd) 0 }, /* CF+ */
		201	{"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */
		202	{"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */
		203
		204	{"reply", SC(ReplyCmd) 0 },
		205	{"exti", SC(ExtiCmd) 0 }, /* CF+ */
		206	{"addme", SC(AddMeCmd) 0 },
		207	{"askface", SC(SendFaceCmd) 0 }, /* Added: phil */
		208	{"requestinfo", SC(RequestInfo) 0 },
		209	{"setfacemode", SC(SetFaceMode) 0 },
		210	{"setsound", SC(SetSound) 0 },
		211	{"setup", SC(SetUp) 0 },
		212	{"version", SC(VersionCmd) 0 },
		213	{"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /Added: tchize /
		214	{"toggleextendedtext", SC(ToggleExtendedText) 0 }, /Added: tchize /
		215	{"asksmooth", SC(AskSmooth) 0 }, /Added: tchize (smoothing technologies) /
		216	};
		217
		218	bool
		219	client::may_execute (const packet_type *pkt) const
		220	{
		221	return (!(pkt->flags & PF_PLAYER) \|\| pl)
		222	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
		223	}
		224
		225	void
		226	client::execute (const packet_type pkt, char data, int datalen)
		227	{
		228	if (may_execute (pkt))
		229	{
		230	//TODO: only one format
		231	if (pkt->flags & PF_PLAYER)
		232	((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
		233	else
		234	((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
		235	}
		236	else
		237	send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
		238	}
		239
		240	bool
		241	client::handle_packet ()
		242	{
		243	int pkt_len = next_packet ();
		244
		245	if (!pkt_len)
		246	return false;
		247	else if (pkt_len < 0)
		248	{
		249	LOG (llevError, "read error on player %s\n",
		250	pl && pl->ob ? &pl->ob->name : "[anonymous]");
		251	destroy ();
		252	return false;
		253	}
		254
		255	inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
		256
		257	/* First, break out beginning word. There are at least
		258	* a few commands that do not have any paremeters. If
		259	* we get such a command, don't worry about trying
		260	* to break it up.
		261	*/
		262	int datalen;
		263	char data = strchr ((char )inbuf + 2, ' ');
		264
		265	if (data)
		266	{
		267	*data++ = 0;
		268	datalen = pkt_len - (data - (char *)inbuf);
		269	}
		270	else
		271	{
		272	data = (char *)inbuf + 2; // better read garbage than segfault
		273	datalen = 0;
		274	}
		275
		276	for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
		277	if (!strcmp ((char *)inbuf + 2, pkt->name))
		278	{
		279	if (pkt->flags & PF_PLAYER)
		280	queue_command (pkt, data, datalen);
		281	else
		282	execute (pkt, data, datalen);
		283
		284	goto next_packet;
		285	}
		286
		287	// If we get here, we didn't find a valid command.
		288	send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
		289	next_packet:
		290	skip_packet (pkt_len);
		291
		292	// input buffer has space again
		293	socket_ev.poll (socket_ev.poll () \| PE_R);
		294
		295	return true;
		296	}
		297
		298	// callback called when socket is either readable or writable
		299	void
		300	client::socket_cb (iow &w, int got)
		301	{
		302	//TODO remove when we have better socket cleanup logic
		303	if (destroyed ())
		304	{
		305	socket_ev.poll (0);
		306	return;
		307	}
		308
		309	if (got & PE_W)
		310	{
		311	write_outputbuffer ();
		312
		313	if (!outputbuffer.len)
		314	socket_ev.poll (socket_ev.poll () & ~PE_W);
		315	}
		316
		317	if (got & PE_R)
		318	{
		319	//TODO: rate-limit tcp connection in better ways, important
		320
		321	int amount = sizeof (inbuf) - inbuf_len;
		322
		323	if (!amount)
		324	{
		325	// input buffer full
		326	socket_ev.poll (socket_ev.poll () & ~PE_R);
		327	return;
		328	}
		329
		330	amount = read (fd, inbuf + inbuf_len, amount);
		331
		332	if (!amount)
		333	{
		334	destroy ();
		335	return;
		336	}
		337	else if (amount < 0)
		338	{
		339	if (errno != EAGAIN && errno != EINTR)
		340	{
		341	LOG (llevError, "read error: %s\n", strerror (errno));
		342	destroy ();
		343	return;
		344	}
		345
		346	// should not be here, normally
		347	}
		348	else
		349	{
		350	inbuf_len += amount;
		351
		352	cst_tot.ibytes += amount;
		353	cst_lst.ibytes += amount;
		354
		355	cmd_ev.start ();
		356	}
		357	}
		358	}
		359
		360	// called whenever we have additional commands to process
		361	void
		362	client::cmd_cb (iw &w)
		363	{
		364	if (handle_packet ())
		365	w.start ();
		366	else
		367	flush ();
		368	}
		369
		370	/*******************************************************************************
		371	*
		372	* Start of write related routines.
		373	*
		374	******************************************************************************/
		375
		376	/**
		377	* Adds data to a socket buffer for whatever reason.
		378	*
		379	* ns is the socket we are adding the data to, buf is the start of the
		380	* data, and len is the number of bytes to add.
		381	*/
		382	void
		383	client::send (void *buf_, int len)
		384	{
		385	char buf = (char )buf_;
		386	char *pos = buf;
		387	int amt = 0;
		388
		389	if (destroyed () \|\| !buf)
		390	return;
		391
		392	if (len + outputbuffer.len > SOCKETBUFSIZE)
		393	{
		394	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
		395	destroy ();
		396	return;
		397	}
		398
		399	int avail, end;
		400
		401	/* data + end is where we start putting the new data. The last byte
		402	* currently in use is actually data + end -1
		403	*/
		404	end = outputbuffer.start + outputbuffer.len;
		405	/* The buffer is already in a wrapped state, so adjust end */
		406	if (end >= SOCKETBUFSIZE)
		407	end -= SOCKETBUFSIZE;
		408
		409	avail = SOCKETBUFSIZE - end;
		410
		411	/* We can all fit it behind the current data without wrapping */
		412	if (avail >= len)
		413	memcpy (outputbuffer.data + end, buf, len);
		414	else
		415	{
		416	memcpy (outputbuffer.data + end, buf, avail);
		417	memcpy (outputbuffer.data, buf + avail, len - avail);
		418	}
		419
		420	outputbuffer.len += len;
		421	}
		422
		423	/**
		424	* Takes a string of data, and writes it out to the socket. A very handy
		425	* shortcut function.
		426	*/
		427	void
		428	client::send_packet (packet &sl)
		429	{
		430	if (destroyed ())
		431	return;
		432
		433	if (sl.length () >= MAXSOCKBUF)
		434	{
		435	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
		436	/* Almost certainly we've overflowed a buffer, so quit now to make
		437	* it easier to debug.
		438	*/
		439	abort ();
		440	}
		441
		442	if (!sl.length ())
		443	return;
		444
		445	assert (sl.hdrlen == 2);
		446
		447	sl.buf_ [0] = sl.length () >> 8;
		448	sl.buf_ [1] = sl.length () ;
		449
		450	send (sl.buf_, sl.length () + sl.hdrlen);
		451	}
		452
		453	void
		454	client::send_packet (const char *buf, int len)
		455	{
		456	packet sl;
		457
		458	sl << data (buf, len);
		459	send_packet (sl);
		460	}
		461
		462	void
		463	client::send_packet (const char *buf)
		464	{
		465	send_packet (buf, strlen (buf));
		466	}
		467
		468	void
		469	client::send_packet_printf (const char *format, ...)
		470	{
		471	packet sl;
		472
		473	va_list ap;
		474	va_start (ap, format);
		475	sl.vprintf (format, ap);
		476	va_end (ap);
		477
		478	send_packet (sl);
81	}	479	}
82		480
83	/***********************************************************************	481	/***********************************************************************
84	*	482	*
85	* packet functions/utilities	483	* packet functions/utilities
86	*	484	*
87	**********************************************************************/	485	**********************************************************************/
		486
		487	packet::packet (const char *name)
		488	{
		489	reset ();
		490
		491	int len = strlen (name);
		492	memcpy (cur, name, len); cur += len;
		493	*cur++ = ' ';
		494	}
88		495
89	packet &packet::operator <<(const data &v)	496	packet &packet::operator <<(const data &v)
90	{	497	{
91	if (room () < v.len)	498	if (room () < v.len)
92	reset ();	499	reset ();
…		…
118	{	525	{
119	return *this << data (v, strlen (v ? v : 0));	526	return *this << data (v, strlen (v ? v : 0));
120	}	527	}
121		528
122	void	529	void
123	packet::printf (const char *format, ...)	530	packet::vprintf (const char *format, va_list ap)
124	{	531	{
125	int size = room ();	532	int size = room ();
126		533
127	va_list ap;
128	va_start (ap, format);
129	int len = vsnprintf ((char *)cur, size, format, ap);	534	int len = vsnprintf ((char *)cur, size, format, ap);
130	va_end (ap);
131		535
132	if (len >= size)	536	if (len >= size)
133	return reset ();	537	return reset ();
134		538
135	cur += len;	539	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	{
149	if (inbuf_len >= 2)
150	{
151	unsigned int pkt_len = (inbuf [0] << 8) \| inbuf [1];
152
153	if (inbuf_len >= 2 + pkt_len)
154	return pkt_len + 2;
155	}
156
157	int amount = sizeof (inbuf) - inbuf_len;
158
159	if (amount <= 0)
160	{
161	LOG (llevError, "packet too large");//TODO
162	return -1;
163	}
164
165	amount = read (fd, inbuf + inbuf_len, amount);
166
167	if (!amount)
168	{
169	status = Ns_Dead;
170	return -1;
171	}
172	else if (amount < 0)
173	{
174	if (errno != EAGAIN && errno != EINTR)
175	{
176	LOG (llevError, "read error: %s", strerror (errno));
177	return -1;
178	}
179
180	return 0;
181	}
182
183	inbuf_len += amount;
184
185	cst_tot.ibytes += amount;
186	cst_lst.ibytes += amount;
187	}
188	}
189
190	void
191	client_socket::skip_packet (int len)
192	{
193	inbuf_len -= len;
194	memmove (inbuf, inbuf + len, inbuf_len);
195	}
196
197	/*******************************************************************************
198	*
199	* Start of write related routines.
200	*
201	******************************************************************************/
202
203	/**
204	* Adds data to a socket buffer for whatever reason.
205	*
206	* 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.
208	*/
209
210	static void
211	add_to_buffer (client_socket ns, char buf, int len)
212	{
213	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
222	/* data + end is where we start putting the new data. The last byte
223	* currently in use is actually data + end -1
224	*/
225
226	end = ns->outputbuffer.start + ns->outputbuffer.len;
227	/* The buffer is already in a wrapped state, so adjust end */
228	if (end >= SOCKETBUFSIZE)
229	end -= SOCKETBUFSIZE;
230
231	avail = SOCKETBUFSIZE - end;
232
233	/* We can all fit it behind the current data without wrapping */
234	if (avail >= len)
235	memcpy (ns->outputbuffer.data + end, buf, len);
236	else
237	{
238	memcpy (ns->outputbuffer.data + end, buf, avail);
239	memcpy (ns->outputbuffer.data, buf + avail, len - avail);
240	}
241
242	ns->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	}
374
375	/**
376	* Takes a string of data, and writes it out to the socket. A very handy
377	* shortcut function.
378	*/
379
380	void
381	client_socket::send_packet (packet &sl)
382	{
383	Send_With_Handling (this, &sl);
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;
414
415	if (msg->length () >= MAXSOCKBUF)
416	{
417	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->length ());
418	/* Almost certainly we've overflowed a buffer, so quite now to make
419	* it easier to debug.
420	*/
421	abort ();
422	}
423
424	sbuf[0] = ((uint32) (msg->length ()) >> 8);
425	sbuf[1] = ((uint32) (msg->length ()) );
426
427	//TODO: single write, or writev
428	ns->send (sbuf, 2);
429	ns->send (msg->buf, msg->length ());
430	}	540	}
431		541
432	/******************************************************************************	542	/******************************************************************************
433	*	543	*
434	* statistics logging functions.	544	* statistics logging functions.

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Comparing deliantra/server/socket/lowlevel.C (file contents): Revision 1.18 by root, Thu Dec 14 05:09:32 2006 UTC vs. Revision 1.32 by pippijn, Sat Jan 20 13:47:17 2007 UTC

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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.18 by root, Thu Dec 14 05:09:32 2006 UTC vs.
Revision 1.32 by pippijn, Sat Jan 20 13:47:17 2007 UTC