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

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.3 by root, Tue Aug 29 08:01:38 2006 UTC vs.
Revision 1.44 by root, Sat Jun 9 22:54:28 2007 UTC

…		…
1
2	/*	1	/*
3	* static char *rcsid_sockets_c =	2	* This file is part of Crossfire TRT, the Multiplayer Online Role Playing Game.
4	* "$Id: lowlevel.C,v 1.3 2006/08/29 08:01:38 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 it
		8	* under the terms of the GNU General Public License as published by the Free
		9	* Software Foundation; either version 2 of the License, or (at your option)
		10	* any later version.
		11	*
		12	* This program is distributed in the hope that it will be useful, but
		13	* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
		14	* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
		15	* for more details.
		16	*
		17	* You should have received a copy of the GNU General Public License along
		18	* with Crossfire TRT; if not, write to the Free Software Foundation, Inc. 51
		19	* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
		20	*
		21	* The authors can be reached via e-mail to <crossfire@schmorp.de>
5	*/	22	*/
6
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		23
29	/**	24	/**
30	* \file	25	* \file
31	* Low-level socket-related functions.	26	* Low-level socket-related functions.
32	*	27	*
39	*/	34	*/
40		35
41	using namespace std;	36	using namespace std;
42		37
43	#include <global.h>	38	#include <global.h>
44	#include <newclient.h>
45	#include <sproto.h>	39	#include <sproto.h>
		40	#include <cstdarg>
46		41
47	#ifdef __linux__	42	#ifdef __linux__
48	# include <sys/types.h>	43	# include <sys/types.h>
49	# include <sys/socket.h>	44	# include <sys/socket.h>
50	# include <netinet/in.h>	45	# include <netinet/in.h>
51	# define TCP_HZ 1000 // sorry...
52	# include <netinet/tcp.h>	46	# include <netinet/tcp.h>
53	#endif	47	#endif
54		48
55	// use a really low timeout, as it doesn't cost any bandwidth, and you can	49	// disconnect a socket after this many seconds without an ack
56	// easily die in 20 seconds...
57	#define SOCKET_TIMEOUT1 10	50	#define SOCKET_TIMEOUT 8.
58	#define SOCKET_TIMEOUT2 20
59		51
60	void Socket_Flush (NewSocket *ns)	52	// force a packet when idle for more than this many seconds,
		53	// forcing an ack regularly.
		54	#define IDLE_PING 2.
		55
		56	void
		57	client::flush ()
61	{	58	{
62	#ifdef __linux__	59	if (destroyed ())
		60	return;
		61
		62	#ifdef __linux__ //TODO: this is available on bsds, too, use a configure test.
		63	// check about once per second, spread evenly over all clients
		64	if (!((pticks + fd) & 7))
		65	{
63	// check time of last ack, and, if too old, kill connection	66	// check time of last ack, and, if too old, kill connection
64	struct tcp_info tcpi;	67	struct tcp_info tcpi;
65	socklen_t len = sizeof (tcpi);	68	socklen_t len = sizeof (tcpi);
66		69
67	if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))	70	if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
68	{	71	{
69	unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;	72	rtt = tcpi.tcpi_rtt;
		73	rttvar = tcpi.tcpi_rttvar;
70		74
71	if (tcpi.tcpi_unacked	75	if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
72	&& SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s
73	&& SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s
74	{	76	{
		77	send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
		78	write_outputbuffer ();
		79
75	LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd,	80	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);	81	(unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
77	ns->status = Ns_Dead;	82	destroy ();
78	}	83	}
		84	}
79	}	85	}
80
81	int val;
82	val = 0; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
83	val = 1; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
84	#endif	86	#endif
85	}
86		87
		88	/**
		89	* Writes data to socket.
		90	*
		91	* When the socket is clear to write, and we have backlogged data, this
		92	* is called to write it out.
		93	*/
		94
		95	// write a nop to the socket at least every IDLE_NOP seconds.
		96	if (!outputbuffer.len)
		97	{
		98	if (last_send + IDLE_PING <= NOW)
		99	{
		100	// this is a bit ugly, but map1/map1a seem to be the only
		101	// nop'able commands and they are quite small.
		102	packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
		103	send_packet (sl);
		104	}
		105	else
		106	return;
		107	}
		108
		109	if (socket_ev.poll () & PE_W)
		110	return;
		111
		112	last_send = NOW;
		113	write_outputbuffer ();
		114	}
		115
		116	void
		117	client::write_outputbuffer ()
		118	{
		119	while (outputbuffer.len)
		120	{
		121	int res = write (fd, outputbuffer.data + outputbuffer.start,
		122	min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
		123
		124	if (res > 0)
		125	{
		126	outputbuffer.start += res;
		127	/* wrap back to start of buffer */
		128	if (outputbuffer.start == SOCKETBUFSIZE)
		129	outputbuffer.start = 0;
		130
		131	outputbuffer.len -= res;
		132	}
		133	else if (res == 0)
		134	{
		135	LOG (llevError, "socket write failed, connection closed.\n");
		136	destroy ();
		137	return;
		138	}
		139	else if (errno == EINTR)
		140	{
		141	// just retry
		142	}
		143	else if (errno == EAGAIN)
		144	{
		145	// delay till ready
		146	socket_ev.poll (socket_ev.poll () \| PE_W);
		147	socket_ev.start ();
		148	return;
		149	}
		150	else
		151	{
		152	LOG (llevError, "socket write failed: %s\n", strerror (errno));
		153	destroy ();
		154	return;
		155	}
		156	}
		157
		158	socket_ev.poll (socket_ev.poll () & ~PE_W);
		159	}
		160
		161	/******************************************************************************
		162	*
		163	* Start of read routines.
		164	*
		165	******************************************************************************/
		166
		167	int
		168	client::next_packet ()
		169	{
		170	if (inbuf_len >= 2)
		171	{
		172	int pkt_len = (inbuf [0] << 8) \| inbuf [1];
		173
		174	if (inbuf_len >= 2 + pkt_len)
		175	return 2 + pkt_len;
		176
		177	if (inbuf_len == sizeof (inbuf))
		178	{
		179	send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED);
		180	destroy ();
		181	return -1;
		182	}
		183	}
		184
		185	return 0;
		186	}
		187
		188	void
		189	client::skip_packet (int len)
		190	{
		191	inbuf_len -= len;
		192	memmove (inbuf, inbuf + len, inbuf_len);
		193	}
		194
87	/***********************************************************************	195	/*****************************************************************************
88	*	196	* Start of command dispatch area.
89	* SockList functions/utilities	197	* The commands here are protocol commands.
90	*
91	**********************************************************************/	198	****************************************************************************/
92		199
93	void SockList_Init(SockList *sl)	200	// SocketCommand, PlayingCommand, should not exist with those ugly casts
94	{	201	#define SC(cb) (void )static_cast<void ()(char , int, client )>(cb),
95	sl->len=0;	202	#define PC(cb) (void )static_cast<void ()(char , int, player )>(cb), PF_PLAYER \|
96	sl->buf=NULL;
97	}
98		203
99	void SockList_AddInt(SockList *sl, uint32 data)	204	/**
100	{	205	* Dispatch table for the server.
101	sl->buf[sl->len++]= (data>>24)&0xff;
102	sl->buf[sl->len++]= (data>>16)&0xff;
103	sl->buf[sl->len++]= (data>>8)&0xff;
104	sl->buf[sl->len++] = data & 0xff;
105	}
106
107	void SockList_AddInt64(SockList *sl, uint64 data)
108	{
109	sl->buf[sl->len++]= ( char )( (data>>56)&0xff );
110	sl->buf[sl->len++]= ( char )( (data>>48)&0xff );
111	sl->buf[sl->len++]= ( char )( (data>>40)&0xff );
112	sl->buf[sl->len++]= ( char )( (data>>32)&0xff );
113
114	sl->buf[sl->len++]= ( char )( (data>>24)&0xff );
115	sl->buf[sl->len++]= ( char )( (data>>16)&0xff );
116	sl->buf[sl->len++]= ( char )( (data>>8)&0xff );
117	sl->buf[sl->len++] =( char )( data & 0xff );
118	}
119
120	/* Basically does the reverse of SockList_AddInt, but on
121	* strings instead. Same for the GetShort, but for 16 bits.
122	*/	206	*/
123	int GetInt_String(unsigned char *data)	207	static struct packet_type packets[] = {
124	{	208	{"ncom", PC(NewPlayerCmd) PF_PLAYING \| PF_COMMAND6 },
125	return ((data[0]<<24) + (data[1]<<16) + (data[2]<<8) + data[3]);	209	{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND0 },
126	}
127		210
128	short GetShort_String(unsigned char *data) {	211	{"examine", PC(ExamineCmd) PF_PLAYING },
129	return ((data[0]<<8)+data[1]);	212	{"ex", PC(ExCmd) PF_PLAYING },
130	}	213	{"apply", PC(ApplyCmd) PF_PLAYING },
		214	{"lookat", PC(LookAt) PF_PLAYING },
		215	{"lock", PC(LockItem) PF_PLAYING },
		216	{"mark", PC(MarkItem) PF_PLAYING },
		217	{"move", PC(MoveCmd) PF_PLAYING },
		218	{"ext", PC(ExtCmd) 0 }, // CF+
		219	{"mapredraw", PC(MapRedrawCmd) 0 },
		220	{"mapinfo", PC(MapInfoCmd) 0 }, // CF+
131		221
132	/******************************************************************************	222	{"reply", SC(ReplyCmd) 0 },
133	*	223	{"exti", SC(ExtiCmd) 0 }, // CF+
134	* Start of read routines.	224	{"addme", SC(AddMeCmd) 0 },
135	*	225	{"askface", SC(AskFaceCmd) 0 },
136	******************************************************************************/	226	{"requestinfo", SC(RequestInfo) 0 },
		227	{"setfacemode", SC(SetFaceMode) 0 },
		228	{"setsound", SC(SetSound) 0 },
		229	{"setup", SC(SetUp) 0 },
		230	{"version", SC(VersionCmd) 0 },
		231	{"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /Added: tchize /
		232	{"toggleextendedtext", SC(ToggleExtendedText) 0 }, /Added: tchize /
		233	{"asksmooth", SC(AskSmooth) 0 }, /Added: tchize (smoothing technologies) /
		234	};
137		235
138	/**	236	bool
139	* This reads from fd and puts the data in sl. We return true if we think	237	client::may_execute (const packet_type *pkt) const
140	* we have a full packet, 0 if we have a partial packet. The only processing	238	{
141	* we do is remove the intial size value. len (As passed) is the size of the	239	return (!(pkt->flags & PF_PLAYER) \|\| pl)
142	* buffer allocated in the socklist. We make the assumption the buffer is	240	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
143	* at least 2 bytes long.	241	}
		242
		243	// HACK: some commands currently should be executed
		244	// even when the player is frozen. this hack detects
		245	// those commands. it should be folded into may_execute,
		246	// but kept seperate to emphasise the hack aspect, i.e.
		247	// do it better, then remove.
		248	static bool
		249	always_immediate (const client ns, const packet_type pkt, const char *data, int len)
		250	{
		251	if (!(pkt->flags & (PF_COMMAND0 \| PF_COMMAND6)))
		252	return false;
		253
		254	if (!ns->pl \|\| !ns->pl->ob \|\| !ns->pl->ob->map)
		255	return false;
		256
		257	if (pkt->flags & PF_COMMAND6)
		258	{
		259	data += 6;
		260	len -= 6;
		261	}
		262
		263	if (len > 4 && !strncmp (data, "say " , 4))
		264	return true;
		265	if (len > 5 && !strncmp (data, "chat ", 5))
		266	return true;
		267
		268	return false;
		269	}
		270
		271	void
		272	client::execute (const packet_type pkt, char data, int datalen)
		273	{
		274	if (may_execute (pkt) \|\| always_immediate (this, pkt, data, datalen))
		275	{
		276	//TODO: only one format
		277	if (pkt->flags & PF_PLAYER)
		278	((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
		279	else
		280	((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
		281	}
		282	else
		283	send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
		284	}
		285
		286	bool
		287	client::handle_packet ()
		288	{
		289	int pkt_len = next_packet ();
		290
		291	if (!pkt_len)
		292	return false;
		293	else if (pkt_len < 0)
		294	{
		295	LOG (llevError, "read error on player %s\n",
		296	pl && pl->ob ? &pl->ob->name : "[anonymous]");
		297	destroy ();
		298	return false;
		299	}
		300
		301	inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
		302
		303	/* First, break out beginning word. There are at least
		304	* a few commands that do not have any paremeters. If
		305	* we get such a command, don't worry about trying
		306	* to break it up.
144	*/	307	*/
145		308	int datalen;
146	int SockList_ReadPacket(int fd, SockList *sl, int len)	309	char data = strchr ((char )inbuf + 2, ' ');
147	{
148	int stat,toread;
149		310
150	/* Sanity check - shouldn't happen */	311	if (data)
151	if (sl->len < 0) {	312	{
152	abort();	313	*data++ = 0;
		314	datalen = pkt_len - (data - (char *)inbuf);
		315	}
		316	else
		317	{
		318	data = (char *)inbuf + 2; // better read garbage than segfault
		319	datalen = 0;
		320	}
		321
		322	for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
		323	if (!strcmp ((char *)inbuf + 2, pkt->name))
		324	{
		325	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
		326	queue_command (pkt, data, datalen);
		327	else
		328	execute (pkt, data, datalen);
		329
		330	goto next_packet;
153	}	331	}
154	/* We already have a partial packet */
155	if (sl->len<2) {
156	#ifdef WIN32 /* **WIN32 SockList_ReadPacket: change read() to recv() /
157		332
158	stat=recv(fd, sl->buf + sl->len, 2-sl->len,0);	333	// If we get here, we didn't find a valid command.
		334	send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
		335	next_packet:
		336	skip_packet (pkt_len);
159		337
160	#else	338	// input buffer has space again
		339	socket_ev.poll (socket_ev.poll () \| PE_R);
		340
		341	return true;
		342	}
		343
		344	// callback called when socket is either readable or writable
		345	void
		346	client::socket_cb (iow &w, int got)
		347	{
		348	//TODO remove when we have better socket cleanup logic
		349	if (destroyed ())
		350	{
		351	socket_ev.poll (0);
		352	return;
		353	}
		354
		355	if (got & PE_W)
		356	{
		357	write_outputbuffer ();
		358
		359	if (!outputbuffer.len)
		360	socket_ev.poll (socket_ev.poll () & ~PE_W);
		361	}
		362
		363	if (got & PE_R)
		364	{
		365	//TODO: rate-limit tcp connection in better ways, important
		366
		367	int amount = sizeof (inbuf) - inbuf_len;
		368
		369	if (!amount)
161	do {	370	{
162	stat=read(fd, sl->buf + sl->len, 2-sl->len);	371	// input buffer full
163	} while ((stat==-1) && (errno==EINTR));	372	socket_ev.poll (socket_ev.poll () & ~PE_R);
164	#endif	373	return;
165	if (stat<0) {	374	}
166	/* In non blocking mode, EAGAIN is set when there is no	375
167	* data available.	376	amount = read (fd, inbuf + inbuf_len, amount);
168	*/	377
169	#ifdef WIN32 /* **WIN32 SockList_ReadPacket: error handling for win32 /	378	if (!amount)
170	if ((stat==-1) && WSAGetLastError() !=WSAEWOULDBLOCK) {	379	{
171	if(WSAGetLastError() == WSAECONNRESET)	380	destroy ();
172	LOG(llevDebug,"Connection closed by client\n");	381	return;
173	else	382	}
		383	else if (amount < 0)
		384	{
		385	if (errno != EAGAIN && errno != EINTR)
174	{	386	{
175	LOG(llevDebug,"ReadPacket got error %d, returning 0\n",WSAGetLastError());	387	LOG (llevError, "read error: %s\n", strerror (errno));
176	}	388	destroy ();
177	return -1; /* kick this user! */	389	return;
178	}	390	}
179	#else	391
180	if (errno != EAGAIN && errno !=EWOULDBLOCK) {	392	// should not be here, normally
181	LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno));
182	}	393	}
183	#endif	394	else
184	return 0; /Error /
185	}	395	{
186	if (stat==0) return -1;	396	inbuf_len += amount;
187	sl->len += stat;
188	#ifdef CS_LOGSTATS
189	cst_tot.ibytes += stat;
190	cst_lst.ibytes += stat;
191	#endif
192	if (stat<2) return 0; /* Still don't have a full packet */
193	}
194	/* Figure out how much more data we need to read. Add 2 from the
195	* end of this - size header information is not included.
196	*/
197	toread = 2+(sl->buf[0] << 8) + sl->buf[1] - sl->len;
198	if ((toread + sl->len) >= len) {
199	LOG(llevError,"SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n",
200	toread + sl->len, len);
201	/* Quick hack in case for 'oldsocketmode' input. If we are
202	* closing the socket anyways, then reading this extra 100 bytes
203	* shouldn't hurt.
204	*/
205	#ifdef WIN32 /* **win32 SockList_ReadPacket: change read() to recv() /
206	recv(fd, sl->buf+2, 100, 0);
207	#else
208	read(fd, sl->buf+2, 100);
209	#endif /* end win32 */
210		397
211	/* return error so the socket is closed */	398	cmd_ev.start ();
212	return -1;
213	}
214	do {
215	#ifdef WIN32 /* **win32 SockList_ReadPacket: change read() to recv() /
216	stat = recv(fd, sl->buf+ sl->len, toread, 0);
217	#else
218	do {
219	stat = read(fd, sl->buf+ sl->len, toread);
220	} while ((stat<0) && (errno==EINTR));
221	#endif
222	if (stat<0) {
223
224	#ifdef WIN32 /* **win32 SockList_ReadPacket: change error handling for win32 /
225	if ((stat==-1) && WSAGetLastError() !=WSAEWOULDBLOCK) {
226	if(WSAGetLastError() == WSAECONNRESET)
227	LOG(llevDebug,"Connection closed by client\n");
228	else
229	{
230	LOG(llevDebug,"ReadPacket got error %d, returning 0\n",WSAGetLastError());
231	}
232	return -1; /* kick this user! */
233	}	399	}
234	#else	400	}
235	if (errno != EAGAIN && errno !=EWOULDBLOCK) {	401	}
236	LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno));	402
237	}	403	// called whenever we have additional commands to process
238	#endif	404	void
239	return 0; /Error /	405	client::cmd_cb (iw &w)
240	}	406	{
241	if (stat==0) return -1;	407	if (handle_packet ())
242	sl->len += stat;	408	w.start ();
243	#ifdef CS_LOGSTATS	409	else
244	cst_tot.ibytes += stat;	410	flush ();
245	cst_lst.ibytes += stat;
246	#endif
247	toread -= stat;
248	if (toread==0) return 1;
249	if (toread < 0) {
250	LOG(llevError,"SockList_ReadPacket: Read more bytes than desired.\n");
251	return 1;
252	}
253	} while (toread>0);
254	return 0;
255	}	411	}
256		412
257	/*******************************************************************************	413	/*******************************************************************************
258	*	414	*
259	* Start of write related routines.	415	* Start of write related routines.
…		…
264	* Adds data to a socket buffer for whatever reason.	420	* Adds data to a socket buffer for whatever reason.
265	*	421	*
266	* ns is the socket we are adding the data to, buf is the start of the	422	* ns is the socket we are adding the data to, buf is the start of the
267	* data, and len is the number of bytes to add.	423	* data, and len is the number of bytes to add.
268	*/	424	*/
269		425	void
270	static void add_to_buffer(NewSocket ns, char buf, int len)	426	client::send (void *buf_, int len)
271	{	427	{
		428	char buf = (char )buf_;
		429
		430	if (destroyed () \|\| !buf)
		431	return;
		432
		433	if (len + outputbuffer.len > SOCKETBUFSIZE)
		434	{
		435	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
		436	// shutdown the socket, this is safer than destroying it immediately
		437	// as lots of code in the callchain might still access the map etc.
		438	shutdown (fd, SHUT_RDWR);
		439	return;
		440	}
		441
272	int avail, end;	442	int avail, end;
273		443
274	if ((len+ns->outputbuffer.len)>SOCKETBUFSIZE) {
275	LOG(llevDebug,"Socket on fd %d has overrun internal buffer - marking as dead\n",
276	ns->fd);
277	ns->status = Ns_Dead;
278	return;
279	}
280
281	/* data + end is where we start putting the new data. The last byte	444	/* data + end is where we start putting the new data. The last byte
282	* currently in use is actually data + end -1	445	* currently in use is actually data + end -1
283	*/	446	*/
284
285	end=ns->outputbuffer.start + ns->outputbuffer.len;	447	end = outputbuffer.start + outputbuffer.len;
286	/* The buffer is already in a wrapped state, so adjust end */	448	/* The buffer is already in a wrapped state, so adjust end */
287	if (end>=SOCKETBUFSIZE) end-=SOCKETBUFSIZE;	449	if (end >= SOCKETBUFSIZE)
		450	end -= SOCKETBUFSIZE;
		451
288	avail=SOCKETBUFSIZE - end;	452	avail = SOCKETBUFSIZE - end;
289		453
290	/* We can all fit it behind the current data without wrapping */	454	/* We can all fit it behind the current data without wrapping */
291	if (avail >=len ) {	455	if (avail >= len)
292	memcpy(ns->outputbuffer.data + end, buf, len);	456	memcpy (outputbuffer.data + end, buf, len);
		457	else
293	}	458	{
294	else {
295	memcpy(ns->outputbuffer.data + end, buf, avail);	459	memcpy (outputbuffer.data + end, buf, avail);
296	memcpy(ns->outputbuffer.data, buf+avail, len-avail);	460	memcpy (outputbuffer.data, buf + avail, len - avail);
297	}	461	}
		462
298	ns->outputbuffer.len += len;	463	outputbuffer.len += len;
299	#if 0
300	LOG(llevDebug,"Added %d to output buffer, total length now %d, start=%d\n", len,
301	ns->outputbuffer.len, ns->outputbuffer.start);
302	#endif
303	}	464	}
304
305	/**
306	* Writes data to socket.
307	*
308	* When the socket is clear to write, and we have backlogged data, this
309	* is called to write it out.
310	*/
311	void write_socket_buffer(NewSocket *ns)
312	{
313	int amt, max;
314
315	if (ns->outputbuffer.len==0) {
316	LOG(llevDebug,"write_socket_buffer called when there is no data, fd=%d\n",
317	ns->fd);
318	return;
319	}
320
321	do {
322	max = SOCKETBUFSIZE - ns->outputbuffer.start;
323	if (ns->outputbuffer.len<max) max = ns->outputbuffer.len;
324
325	#ifdef WIN32 /* **win32 write_socket_buffer: change write() to send() /
326	amt=send(ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max,0);
327	#else
328	do {
329	amt=write(ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
330	} while ((amt<0) && (errno==EINTR));
331	#endif
332
333	if (amt < 0) { /* We got an error */
334
335	#ifdef WIN32 /* **win32 write_socket_buffer: change error handling /
336	if (amt == -1 && WSAGetLastError() !=WSAEWOULDBLOCK) {
337	LOG(llevError,"New socket write failed (wsb) (%d).\n", WSAGetLastError());
338	#else
339	if (errno !=EWOULDBLOCK) {
340	LOG(llevError,"New socket write failed (wsb) (%d: %s).\n",
341	errno, strerror_local(errno));
342	#endif
343	ns->status=Ns_Dead;
344	return;
345	}
346	else { /* EWOULDBLOCK */
347	/* can't write it, so store it away. */
348	ns->can_write=0;
349	return;
350	}
351	}
352	ns->outputbuffer.start += amt;
353	/* wrap back to start of buffer */
354	if (ns->outputbuffer.start==SOCKETBUFSIZE) ns->outputbuffer.start=0;
355	ns->outputbuffer.len -= amt;
356	#ifdef CS_LOGSTATS
357	cst_tot.obytes += amt;
358	cst_lst.obytes += amt;
359	#endif
360	} while (ns->outputbuffer.len>0);
361	}
362
363	/**
364	* This writes data to the socket. - It is very low level -
365	* all we try and do is write out the data to the socket
366	* provided (ns). buf is the data to write, len is the number
367	* of bytes to write. IT doesn't return anything - rather, it
368	* updates the ns structure if we get an error.
369	*/
370	void Write_To_Socket(NewSocket ns, char buf, int len)
371	{
372	int amt=0;
373	char *pos=buf;
374
375	if (ns->status == Ns_Dead \|\| !buf) {
376	LOG(llevDebug,"Write_To_Socket called with dead socket\n");
377	return;
378	}
379
380	#ifndef __GNU__ /* This caused problems on Hurd */
381	if (!ns->can_write) {
382	add_to_buffer(ns, buf, len);
383	return;
384	}
385	#endif
386	/* If we manage to write more than we wanted, take it as a bonus */
387	while (len>0) {
388
389	#ifdef WIN32 /* **win32 Write_To_Socket: change write() to send() /
390	amt=send(ns->fd, pos, len,0);
391	#else
392	do {
393	amt=write(ns->fd, pos, len);
394	} while ((amt<0) && (errno==EINTR));
395	#endif
396
397	if (amt < 0) { /* We got an error */
398	#ifdef WIN32 /* **win32 Write_To_Socket: change error handling /
399	if (amt == -1 && WSAGetLastError() !=WSAEWOULDBLOCK) {
400	LOG(llevError,"New socket write failed WTS (%d).\n",WSAGetLastError());
401	#else
402	if (errno !=EWOULDBLOCK) {
403	LOG(llevError,"New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
404	errno, strerror_local(errno));
405	#endif
406	ns->status=Ns_Dead;
407	return;
408	}
409	else { /* EWOULDBLOCK */
410	/* can't write it, so store it away. */
411	add_to_buffer(ns, pos, len);
412	ns->can_write=0;
413	return;
414	}
415	}
416	/* amt gets set to 0 above in blocking code, so we do this as
417	* an else if to make sure we don't reprocess it.
418	*/
419	else if (amt==0) {
420	LOG(llevError,"Write_To_Socket: No data written out.\n");
421	}
422	len -= amt;
423	pos += amt;
424	#ifdef CS_LOGSTATS
425	cst_tot.obytes += amt;
426	cst_lst.obytes += amt;
427	#endif
428	}
429	}
430
431		465
432	/**	466	/**
433	* Takes a string of data, and writes it out to the socket. A very handy	467	* Takes a string of data, and writes it out to the socket. A very handy
434	* shortcut function.	468	* shortcut function.
435	*/	469	*/
436	void cs_write_string(NewSocket ns, const char buf, int len)	470	void
		471	client::send_packet (packet &sl)
437	{	472	{
438	SockList sl;	473	if (destroyed ())
439
440	sl.len = len;
441	sl.buf = (unsigned char*)buf;
442	Send_With_Handling(ns, &sl);
443	}
444
445
446	/**
447	* Calls Write_To_Socket to send data to the client.
448	*
449	* The only difference in this function is that we take a SockList
450	*, and we prepend the length information.
451	*/
452	void Send_With_Handling(NewSocket ns,SockList msg)
453	{
454	unsigned char sbuf[4];
455
456	if (ns->status == Ns_Dead \|\| !msg)
457	return;	474	return;
458		475
459	if (msg->len >= MAXSOCKBUF) {	476	if (sl.length () >= MAXSOCKBUF)
		477	{
460	LOG(llevError,"Trying to send a buffer beyond properly size, len =%d\n",	478	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
461	msg->len);
462	/* Almost certainly we've overflowed a buffer, so quite now to make	479	/* Almost certainly we've overflowed a buffer, so quit now to make
463	* it easier to debug.	480	* it easier to debug.
464	*/	481	*/
465	abort();	482	abort ();
		483	}
		484
		485	if (!sl.length ())
		486	return;
		487
		488	assert (sl.hdrlen == 2);
		489
		490	sl.buf_ [0] = sl.length () >> 8;
		491	sl.buf_ [1] = sl.length () ;
		492
		493	send (sl.buf_, sl.length () + sl.hdrlen);
		494	}
		495
		496	void
		497	client::send_packet (const char *buf, int len)
		498	{
		499	packet sl;
		500
		501	sl << data (buf, len);
		502	send_packet (sl);
		503	}
		504
		505	void
		506	client::send_packet (const char *buf)
		507	{
		508	send_packet (buf, strlen (buf));
		509	}
		510
		511	void
		512	client::send_packet_printf (const char *format, ...)
		513	{
		514	packet sl;
		515
		516	va_list ap;
		517	va_start (ap, format);
		518	sl.vprintf (format, ap);
		519	va_end (ap);
		520
		521	send_packet (sl);
		522	}
		523
		524	void
		525	client::send_drawinfo (const char *msg, int flags)
		526	{
		527	send_packet_printf ("drawinfo %d %s", flags, msg);
		528	}
		529
		530	void
		531	client::send_msg (int color, const char type, const char msg)
		532	{
		533	if (can_msg)
		534	send_packet_printf ("msg %d %s %s", color, type, msg);
		535	else if (color < 0)
		536	return; // client cannot handle this
		537	else if (strchr (msg, '<') \|\| strchr (msg, '&'))
466	}	538	{
467	sbuf[0] = ((uint32)(msg->len) >> 8) & 0xFF;	539	//TODO: should escape/modify to old syntax
468	sbuf[1] = ((uint32)(msg->len)) & 0xFF;	540	send_packet_printf ("drawinfo %d %s", color, msg);
469	if (ns->status != Ns_Old)	541	}
470	Write_To_Socket(ns, (char *) sbuf, 2);	542	else
471	Write_To_Socket(ns, (char*)msg->buf, msg->len);	543	send_packet_printf ("drawinfo %d %s", color, msg);
472	}	544	}
473		545
474	/**
475	* Takes a string of data, and writes it out to the socket. A very handy
476	* shortcut function.
477	*/
478	void Write_String_To_Socket(NewSocket ns, char buf, int len)
479	{
480	SockList sl;
481
482	sl.len = len;
483	sl.buf = (unsigned char*) buf;
484	Send_With_Handling(ns, &sl);
485	}
486
487
488	/******************************************************************************	546	/***********************************************************************
489	*	547	*
490	* statistics logging functions.	548	* packet functions/utilities
491	*	549	*
492	******************************************************************************/	550	**********************************************************************/
493		551
494	#ifdef CS_LOGSTATS	552	packet::packet (const char *name)
495	/* cst_tot is for the life of the server, cst_last is for the last series of
496	* stats
497	*/
498	CS_Stats cst_tot, cst_lst;
499
500	/**
501	* Writes out the gathered stats. We clear cst_lst.
502	*/
503	void write_cs_stats(void)
504	{	553	{
505	time_t now=time(NULL);	554	reset ();
506		555
507	/* If no connections recently, don't both to log anything */	556	int len = strlen (name);
508	if (cst_lst.ibytes==0 && cst_lst.obytes==0) return;	557	memcpy (cur, name, len); cur += len;
509		558	*cur++ = ' ';
510	/* CSSTAT is put in so scripts can easily find the line */
511	LOG(llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
512	ctime(&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
513	now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes,
514	cst_lst.max_conn, now - cst_lst.time_start);
515	cst_lst.ibytes=0;
516	cst_lst.obytes=0;
517	cst_lst.max_conn=socket_info.nconns;
518	cst_lst.time_start=now;
519	}	559	}
520	#endif	560
		561	packet &packet::operator <<(const ber32 v)
		562	{
		563	enum { maxlen = 32 / 7 + 1};
		564	uint8 buf[maxlen];
		565	uint8 *p = buf + maxlen;
		566	uint32 val = v.val;
		567
		568	*--p = val & 0x7F;
		569
		570	while (val > 0x7F)
		571	{
		572	val >>= 7;
		573	*--p = (val & 0x7F) \| 0x80;
		574	}
		575
		576	return *this << data (p, buf + maxlen - p);
		577	}
		578
		579	packet &packet::operator <<(const data &v)
		580	{
		581	if (room () < v.len)
		582	reset ();
		583	else
		584	{
		585	if (v.len)
		586	{
		587	memcpy (cur, v.ptr, v.len);
		588	cur += v.len;
		589	}
		590	}
		591
		592	return *this;
		593	}
		594
		595	packet &packet::operator <<(const data8 &v)
		596	{
		597	unsigned int len = min (v.len, 0x00FF);
		598	return *this << uint8 (len) << data (v.ptr, len);
		599	}
		600
		601	packet &packet::operator <<(const data16 &v)
		602	{
		603	unsigned int len = min (v.len, 0xFFFF);
		604	return *this << uint16 (len) << data (v.ptr, len);
		605	}
		606
		607	packet &packet::operator <<(const char *v)
		608	{
		609	return *this << data (v, strlen (v ? v : 0));
		610	}
		611
		612	void
		613	packet::vprintf (const char *format, va_list ap)
		614	{
		615	int size = room ();
		616
		617	int len = vsnprintf ((char *)cur, size, format, ap);
		618
		619	if (len >= size)
		620	return reset ();
		621
		622	cur += len;
		623	}
		624

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Comparing deliantra/server/socket/lowlevel.C (file contents): Revision 1.3 by root, Tue Aug 29 08:01:38 2006 UTC vs. Revision 1.44 by root, Sat Jun 9 22:54:28 2007 UTC

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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.3 by root, Tue Aug 29 08:01:38 2006 UTC vs.
Revision 1.44 by root, Sat Jun 9 22:54:28 2007 UTC