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

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.1 by elmex, Sun Aug 13 17:16:06 2006 UTC vs.
Revision 1.46 by root, Sun Jun 10 04:44:21 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 1.1 2006/08/13 17:16:06 elmex 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		23
7	/*
8	CrossFire, A Multiplayer game for X-windows
9
10	Copyright (C) 1992 Frank Tore Johansen
11
12	This program is free software; you can redistribute it and/or modify
13	it under the terms of the GNU General Public License as published by
14	the Free Software Foundation; either version 2 of the License, or
15	(at your option) any later version.
16
17	This program is distributed in the hope that it will be useful,
18	but WITHOUT ANY WARRANTY; without even the implied warranty of
19	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20	GNU General Public License for more details.
21
22	You should have received a copy of the GNU General Public License
23	along with this program; if not, write to the Free Software
24	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25
26	The author can be reached via e-mail to mark@pyramid.com
27	*/
28
29	/**
30	* \file
31	* Low-level socket-related functions.
32	*
33	* \date 2003-12-02
34	*
35	* Contains some base functions that both the client and server
36	* can use. As such, depending what we are being compiled for will
37	* determine what we can include. the client is designed have
38	* CFCLIENT defined as part of its compile flags.
39	*/
40
41	using namespace std;	24	using namespace std;
42		25
43	#include <global.h>	26	#include <global.h>
44	#include <newclient.h>
45	#include <sproto.h>	27	#include <sproto.h>
		28	#include <cstdarg>
46		29
47	#ifdef __linux__	30	#if HAVE_TCP_INFO
48	# include <sys/types.h>	31	# include <sys/types.h>
49	# include <sys/socket.h>	32	# include <sys/socket.h>
50	# include <netinet/in.h>	33	# include <netinet/in.h>
51	# define TCP_HZ 1000 // sorry...
52	# include <netinet/tcp.h>	34	# include <netinet/tcp.h>
53	#endif	35	#endif
54		36
55	// use a really low timeout, as it doesn't cost any bandwidth, and you can	37	// disconnect a socket after this many seconds without an ack
56	// easily die in 20 seconds...
57	#define SOCKET_TIMEOUT1 10	38	#define SOCKET_TIMEOUT 8.
58	#define SOCKET_TIMEOUT2 20
59		39
60	void Socket_Flush (NewSocket *ns)	40	// force a packet when idle for more than this many seconds,
		41	// forcing an ack regularly.
		42	#define IDLE_PING 2.
		43
		44	void
		45	client::flush ()
61	{	46	{
62	#ifdef __linux__	47	if (destroyed ())
		48	return;
		49
		50	#if HAVE_TCP_INFO
		51	// check about once per second, spread evenly over all clients
		52	if (!((pticks + fd) & 7))
		53	{
63	// check time of last ack, and, if too old, kill connection	54	// check time of last ack, and, if too old, kill connection
64	struct tcp_info tcpi;	55	struct tcp_info tcpi;
65	socklen_t len = sizeof (tcpi);	56	socklen_t len = sizeof (tcpi);
66		57
67	if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))	58	if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
68	{	59	{
69	unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;	60	if (tcpi.tcpi_snd_mss)
		61	mss = tcpi.tcpi_snd_mss;
70		62
71	if (tcpi.tcpi_unacked	63	rtt = tcpi.tcpi_rtt;
72	&& SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s	64	rttvar = tcpi.tcpi_rttvar;
73	&& SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s	65
		66	if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
74	{	67	{
		68	send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
		69	write_outputbuffer ();
		70
75	LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd,	71	LOG (llevDebug, "connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
76	(unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);	72	(unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
77	ns->status = Ns_Dead;	73	destroy ();
78	}	74	}
		75	}
79	}	76	}
80
81	int val;
82	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	77	#endif
85	}
86		78
87	/***********************************************************************	79	/**
88	*	80	* Writes data to socket.
89	* SockList functions/utilities	81	*
90	*	82	* When the socket is clear to write, and we have backlogged data, this
91	**********************************************************************/	83	* is called to write it out.
92
93	void SockList_Init(SockList *sl)
94	{
95	sl->len=0;
96	sl->buf=NULL;
97	}
98
99	void SockList_AddChar(SockList *sl, char c)
100	{
101	sl->buf[sl->len]=c;
102	sl->len++;
103	}
104
105	void SockList_AddShort(SockList *sl, uint16 data)
106	{
107	sl->buf[sl->len++]= (data>>8)&0xff;
108	sl->buf[sl->len++] = data & 0xff;
109	}
110
111
112	void SockList_AddInt(SockList *sl, uint32 data)
113	{
114	sl->buf[sl->len++]= (data>>24)&0xff;
115	sl->buf[sl->len++]= (data>>16)&0xff;
116	sl->buf[sl->len++]= (data>>8)&0xff;
117	sl->buf[sl->len++] = data & 0xff;
118	}
119
120	void SockList_AddInt64(SockList *sl, uint64 data)
121	{
122	sl->buf[sl->len++]= ( char )( (data>>56)&0xff );
123	sl->buf[sl->len++]= ( char )( (data>>48)&0xff );
124	sl->buf[sl->len++]= ( char )( (data>>40)&0xff );
125	sl->buf[sl->len++]= ( char )( (data>>32)&0xff );
126
127	sl->buf[sl->len++]= ( char )( (data>>24)&0xff );
128	sl->buf[sl->len++]= ( char )( (data>>16)&0xff );
129	sl->buf[sl->len++]= ( char )( (data>>8)&0xff );
130	sl->buf[sl->len++] =( char )( data & 0xff );
131	}
132
133	/* Basically does the reverse of SockList_AddInt, but on
134	* strings instead. Same for the GetShort, but for 16 bits.
135	*/	84	*/
136	int GetInt_String(unsigned char *data)
137	{
138	return ((data[0]<<24) + (data[1]<<16) + (data[2]<<8) + data[3]);
139	}
140		85
141	short GetShort_String(unsigned char *data) {	86	// write a nop to the socket at least every IDLE_NOP seconds.
142	return ((data[0]<<8)+data[1]);	87	if (!outputbuffer.len)
		88	{
		89	if (last_send + IDLE_PING <= NOW)
		90	{
		91	// this is a bit ugly, but map1/map1a seem to be the only
		92	// nop'able commands and they are quite small.
		93	packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
		94	send_packet (sl);
		95	}
		96	else
		97	return;
		98	}
		99
		100	if (socket_ev.poll () & PE_W)
		101	return;
		102
		103	last_send = NOW;
		104	write_outputbuffer ();
		105	}
		106
		107	void
		108	client::write_outputbuffer ()
		109	{
		110	while (outputbuffer.len)
		111	{
		112	int res = write (fd, outputbuffer.data + outputbuffer.start,
		113	min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
		114
		115	if (res > 0)
		116	{
		117	outputbuffer.start += res;
		118	/* wrap back to start of buffer */
		119	if (outputbuffer.start == SOCKETBUFSIZE)
		120	outputbuffer.start = 0;
		121
		122	outputbuffer.len -= res;
		123	}
		124	else if (res == 0)
		125	{
		126	LOG (llevError, "socket write failed, connection closed.\n");
		127	destroy ();
		128	return;
		129	}
		130	else if (errno == EINTR)
		131	{
		132	// just retry
		133	}
		134	else if (errno == EAGAIN)
		135	{
		136	// delay till ready
		137	socket_ev.poll (socket_ev.poll () \| PE_W);
		138	socket_ev.start ();
		139	return;
		140	}
		141	else
		142	{
		143	LOG (llevError, "socket write failed: %s\n", strerror (errno));
		144	destroy ();
		145	return;
		146	}
		147	}
		148
		149	socket_ev.poll (socket_ev.poll () & ~PE_W);
143	}	150	}
144		151
145	/******************************************************************************	152	/******************************************************************************
146	*	153	*
147	* Start of read routines.	154	* Start of read routines.
148	*	155	*
149	******************************************************************************/	156	******************************************************************************/
150		157
		158	int
		159	client::next_packet ()
		160	{
		161	if (inbuf_len >= 2)
		162	{
		163	int pkt_len = (inbuf [0] << 8) \| inbuf [1];
		164
		165	if (inbuf_len >= 2 + pkt_len)
		166	return 2 + pkt_len;
		167
		168	if (inbuf_len == sizeof (inbuf))
		169	{
		170	send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED);
		171	destroy ();
		172	return -1;
		173	}
		174	}
		175
		176	return 0;
		177	}
		178
		179	void
		180	client::skip_packet (int len)
		181	{
		182	inbuf_len -= len;
		183	memmove (inbuf, inbuf + len, inbuf_len);
		184	}
		185
		186	/*****************************************************************************
		187	* Start of command dispatch area.
		188	* The commands here are protocol commands.
		189	****************************************************************************/
		190
		191	// SocketCommand, PlayingCommand, should not exist with those ugly casts
		192	#define SC(cb) (void )static_cast<void ()(char , int, client )>(cb),
		193	#define PC(cb) (void )static_cast<void ()(char , int, player )>(cb), PF_PLAYER \|
		194
151	/**	195	/**
152	* This reads from fd and puts the data in sl. We return true if we think	196	* Dispatch table for the server.
153	* we have a full packet, 0 if we have a partial packet. The only processing
154	* we do is remove the intial size value. len (As passed) is the size of the
155	* buffer allocated in the socklist. We make the assumption the buffer is
156	* at least 2 bytes long.
157	*/	197	*/
158		198	static struct packet_type packets[] = {
159	int SockList_ReadPacket(int fd, SockList *sl, int len)	199	{"ncom", PC(NewPlayerCmd) PF_PLAYING \| PF_COMMAND6 },
160	{	200	{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND0 },
161	int stat,toread;
162		201
163	/* Sanity check - shouldn't happen */	202	{"examine", PC(ExamineCmd) PF_PLAYING },
164	if (sl->len < 0) {	203	{"ex", PC(ExCmd) PF_PLAYING },
165	abort();	204	{"apply", PC(ApplyCmd) PF_PLAYING },
		205	{"lookat", PC(LookAt) PF_PLAYING },
		206	{"lock", PC(LockItem) PF_PLAYING },
		207	{"mark", PC(MarkItem) PF_PLAYING },
		208	{"move", PC(MoveCmd) PF_PLAYING },
		209	{"ext", PC(ExtCmd) 0 }, // CF+
		210	{"mapredraw", PC(MapRedrawCmd) 0 },
		211	{"mapinfo", PC(MapInfoCmd) 0 }, // CF+
		212
		213	{"reply", SC(ReplyCmd) 0 },
		214	{"exti", SC(ExtiCmd) 0 }, // CF+
		215	{"addme", SC(AddMeCmd) 0 },
		216	{"askface", SC(AskFaceCmd) 0 },
		217	{"requestinfo", SC(RequestInfo) 0 },
		218	{"setfacemode", SC(SetFaceMode) 0 },
		219	{"setsound", SC(SetSound) 0 },
		220	{"setup", SC(SetUp) 0 },
		221	{"version", SC(VersionCmd) 0 },
		222	{"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /Added: tchize /
		223	{"toggleextendedtext", SC(ToggleExtendedText) 0 }, /Added: tchize /
		224	{"asksmooth", SC(AskSmooth) 0 }, /Added: tchize (smoothing technologies) /
		225	};
		226
		227	bool
		228	client::may_execute (const packet_type *pkt) const
		229	{
		230	return (!(pkt->flags & PF_PLAYER) \|\| pl)
		231	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
		232	}
		233
		234	// HACK: some commands currently should be executed
		235	// even when the player is frozen. this hack detects
		236	// those commands. it should be folded into may_execute,
		237	// but kept seperate to emphasise the hack aspect, i.e.
		238	// do it better, then remove.
		239	static bool
		240	always_immediate (const client ns, const packet_type pkt, const char *data, int len)
		241	{
		242	if (!(pkt->flags & (PF_COMMAND0 \| PF_COMMAND6)))
		243	return false;
		244
		245	if (!ns->pl \|\| !ns->pl->ob \|\| !ns->pl->ob->map)
		246	return false;
		247
		248	if (pkt->flags & PF_COMMAND6)
166	}	249	{
167	/* We already have a partial packet */	250	data += 6;
168	if (sl->len<2) {	251	len -= 6;
169	#ifdef WIN32 /* **WIN32 SockList_ReadPacket: change read() to recv() /
170
171	stat=recv(fd, sl->buf + sl->len, 2-sl->len,0);
172
173	#else
174	do {
175	stat=read(fd, sl->buf + sl->len, 2-sl->len);
176	} while ((stat==-1) && (errno==EINTR));
177	#endif
178	if (stat<0) {
179	/* In non blocking mode, EAGAIN is set when there is no
180	* data available.
181	*/
182	#ifdef WIN32 /* **WIN32 SockList_ReadPacket: error handling for win32 /
183	if ((stat==-1) && WSAGetLastError() !=WSAEWOULDBLOCK) {
184	if(WSAGetLastError() == WSAECONNRESET)
185	LOG(llevDebug,"Connection closed by client\n");
186	else
187	{
188	LOG(llevDebug,"ReadPacket got error %d, returning 0\n",WSAGetLastError());
189	}
190	return -1; /* kick this user! */
191	}	252	}
192	#else	253
193	if (errno != EAGAIN && errno !=EWOULDBLOCK) {	254	if (len > 4 && !strncmp (data, "say " , 4))
194	LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno));	255	return true;
		256	if (len > 5 && !strncmp (data, "chat ", 5))
		257	return true;
		258
		259	return false;
		260	}
		261
		262	void
		263	client::execute (const packet_type pkt, char data, int datalen)
		264	{
		265	if (may_execute (pkt) \|\| always_immediate (this, pkt, data, datalen))
		266	{
		267	//TODO: only one format
		268	if (pkt->flags & PF_PLAYER)
		269	((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
		270	else
		271	((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
195	}	272	}
196	#endif	273	else
197	return 0; /Error /	274	send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
198	}	275	}
199	if (stat==0) return -1;	276
200	sl->len += stat;	277	bool
201	#ifdef CS_LOGSTATS	278	client::handle_packet ()
202	cst_tot.ibytes += stat;	279	{
203	cst_lst.ibytes += stat;	280	int pkt_len = next_packet ();
204	#endif	281
205	if (stat<2) return 0; /* Still don't have a full packet */	282	if (!pkt_len)
		283	return false;
		284	else if (pkt_len < 0)
206	}	285	{
207	/* Figure out how much more data we need to read. Add 2 from the	286	LOG (llevError, "read error on player %s\n",
208	* end of this - size header information is not included.	287	pl && pl->ob ? &pl->ob->name : "[anonymous]");
209	*/	288	destroy ();
210	toread = 2+(sl->buf[0] << 8) + sl->buf[1] - sl->len;	289	return false;
211	if ((toread + sl->len) >= len) {
212	LOG(llevError,"SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n",
213	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
224	/* return error so the socket is closed */
225	return -1;
226	}
227	do {
228	#ifdef WIN32 /* **win32 SockList_ReadPacket: change read() to recv() /
229	stat = recv(fd, sl->buf+ sl->len, toread, 0);
230	#else
231	do {
232	stat = read(fd, sl->buf+ sl->len, toread);
233	} while ((stat<0) && (errno==EINTR));
234	#endif
235	if (stat<0) {
236
237	#ifdef WIN32 /* **win32 SockList_ReadPacket: change error handling for win32 /
238	if ((stat==-1) && WSAGetLastError() !=WSAEWOULDBLOCK) {
239	if(WSAGetLastError() == WSAECONNRESET)
240	LOG(llevDebug,"Connection closed by client\n");
241	else
242	{
243	LOG(llevDebug,"ReadPacket got error %d, returning 0\n",WSAGetLastError());
244	}
245	return -1; /* kick this user! */
246	}	290	}
247	#else	291
248	if (errno != EAGAIN && errno !=EWOULDBLOCK) {	292	inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
249	LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno));	293
		294	/* First, break out beginning word. There are at least
		295	* a few commands that do not have any paremeters. If
		296	* we get such a command, don't worry about trying
		297	* to break it up.
		298	*/
		299	int datalen;
		300	char data = strchr ((char )inbuf + 2, ' ');
		301
		302	if (data)
		303	{
		304	*data++ = 0;
		305	datalen = pkt_len - (data - (char *)inbuf);
250	}	306	}
251	#endif	307	else
252	return 0; /Error /	308	{
253	}	309	data = (char *)inbuf + 2; // better read garbage than segfault
254	if (stat==0) return -1;	310	datalen = 0;
255	sl->len += stat;	311	}
256	#ifdef CS_LOGSTATS	312
257	cst_tot.ibytes += stat;	313	for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
258	cst_lst.ibytes += stat;	314	if (!strcmp ((char *)inbuf + 2, pkt->name))
259	#endif	315	{
260	toread -= stat;	316	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
261	if (toread==0) return 1;	317	queue_command (pkt, data, datalen);
262	if (toread < 0) {	318	else
263	LOG(llevError,"SockList_ReadPacket: Read more bytes than desired.\n");	319	execute (pkt, data, datalen);
264	return 1;	320
265	}	321	goto next_packet;
266	} while (toread>0);	322	}
		323
		324	// If we get here, we didn't find a valid command.
		325	send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
		326	next_packet:
		327	skip_packet (pkt_len);
		328
		329	// input buffer has space again
		330	socket_ev.poll (socket_ev.poll () \| PE_R);
		331
		332	return true;
		333	}
		334
		335	// callback called when socket is either readable or writable
		336	void
		337	client::socket_cb (iow &w, int got)
		338	{
		339	//TODO remove when we have better socket cleanup logic
		340	if (destroyed ())
		341	{
		342	socket_ev.poll (0);
267	return 0;	343	return;
		344	}
		345
		346	if (got & PE_W)
		347	{
		348	write_outputbuffer ();
		349
		350	if (!outputbuffer.len)
		351	socket_ev.poll (socket_ev.poll () & ~PE_W);
		352	}
		353
		354	if (got & PE_R)
		355	{
		356	//TODO: rate-limit tcp connection in better ways, important
		357
		358	int amount = sizeof (inbuf) - inbuf_len;
		359
		360	if (!amount)
		361	{
		362	// input buffer full
		363	socket_ev.poll (socket_ev.poll () & ~PE_R);
		364	return;
		365	}
		366
		367	amount = read (fd, inbuf + inbuf_len, amount);
		368
		369	if (!amount)
		370	{
		371	destroy ();
		372	return;
		373	}
		374	else if (amount < 0)
		375	{
		376	if (errno != EAGAIN && errno != EINTR)
		377	{
		378	LOG (llevError, "read error: %s\n", strerror (errno));
		379	destroy ();
		380	return;
		381	}
		382
		383	// should not be here, normally
		384	}
		385	else
		386	{
		387	inbuf_len += amount;
		388
		389	cmd_ev.start ();
		390	}
		391	}
		392	}
		393
		394	// called whenever we have additional commands to process
		395	void
		396	client::cmd_cb (iw &w)
		397	{
		398	if (handle_packet ())
		399	w.start ();
		400	else
		401	flush ();
268	}	402	}
269		403
270	/*******************************************************************************	404	/*******************************************************************************
271	*	405	*
272	* Start of write related routines.	406	* Start of write related routines.
277	* Adds data to a socket buffer for whatever reason.	411	* Adds data to a socket buffer for whatever reason.
278	*	412	*
279	* ns is the socket we are adding the data to, buf is the start of the	413	* ns is the socket we are adding the data to, buf is the start of the
280	* data, and len is the number of bytes to add.	414	* data, and len is the number of bytes to add.
281	*/	415	*/
282		416	void
283	static void add_to_buffer(NewSocket ns, char buf, int len)	417	client::send (void *buf_, int len)
284	{	418	{
		419	char buf = (char )buf_;
		420
		421	if (destroyed () \|\| !buf)
		422	return;
		423
		424	if (len + outputbuffer.len > SOCKETBUFSIZE)
		425	{
		426	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
		427	// shutdown the socket, this is safer than destroying it immediately
		428	// as lots of code in the callchain might still access the map etc.
		429	shutdown (fd, SHUT_RDWR);
		430	return;
		431	}
		432
285	int avail, end;	433	int avail, end;
286		434
287	if ((len+ns->outputbuffer.len)>SOCKETBUFSIZE) {
288	LOG(llevDebug,"Socket on fd %d has overrun internal buffer - marking as dead\n",
289	ns->fd);
290	ns->status = Ns_Dead;
291	return;
292	}
293
294	/* data + end is where we start putting the new data. The last byte	435	/* data + end is where we start putting the new data. The last byte
295	* currently in use is actually data + end -1	436	* currently in use is actually data + end -1
296	*/	437	*/
297
298	end=ns->outputbuffer.start + ns->outputbuffer.len;	438	end = outputbuffer.start + outputbuffer.len;
299	/* The buffer is already in a wrapped state, so adjust end */	439	/* The buffer is already in a wrapped state, so adjust end */
300	if (end>=SOCKETBUFSIZE) end-=SOCKETBUFSIZE;	440	if (end >= SOCKETBUFSIZE)
		441	end -= SOCKETBUFSIZE;
		442
301	avail=SOCKETBUFSIZE - end;	443	avail = SOCKETBUFSIZE - end;
302		444
303	/* We can all fit it behind the current data without wrapping */	445	/* We can all fit it behind the current data without wrapping */
304	if (avail >=len ) {	446	if (avail >= len)
305	memcpy(ns->outputbuffer.data + end, buf, len);	447	memcpy (outputbuffer.data + end, buf, len);
		448	else
306	}	449	{
307	else {
308	memcpy(ns->outputbuffer.data + end, buf, avail);	450	memcpy (outputbuffer.data + end, buf, avail);
309	memcpy(ns->outputbuffer.data, buf+avail, len-avail);	451	memcpy (outputbuffer.data, buf + avail, len - avail);
310	}
311	ns->outputbuffer.len += len;
312	#if 0
313	LOG(llevDebug,"Added %d to output buffer, total length now %d, start=%d\n", len,
314	ns->outputbuffer.len, ns->outputbuffer.start);
315	#endif
316	}
317
318	/**
319	* Writes data to socket.
320	*
321	* When the socket is clear to write, and we have backlogged data, this
322	* is called to write it out.
323	*/
324	void write_socket_buffer(NewSocket *ns)
325	{
326	int amt, max;
327
328	if (ns->outputbuffer.len==0) {
329	LOG(llevDebug,"write_socket_buffer called when there is no data, fd=%d\n",
330	ns->fd);
331	return;
332	}
333
334	do {
335	max = SOCKETBUFSIZE - ns->outputbuffer.start;
336	if (ns->outputbuffer.len<max) max = ns->outputbuffer.len;
337
338	#ifdef WIN32 /* **win32 write_socket_buffer: change write() to send() /
339	amt=send(ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max,0);
340	#else
341	do {
342	amt=write(ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
343	} while ((amt<0) && (errno==EINTR));
344	#endif
345
346	if (amt < 0) { /* We got an error */
347
348	#ifdef WIN32 /* **win32 write_socket_buffer: change error handling /
349	if (amt == -1 && WSAGetLastError() !=WSAEWOULDBLOCK) {
350	LOG(llevError,"New socket write failed (wsb) (%d).\n", WSAGetLastError());
351	#else
352	if (errno !=EWOULDBLOCK) {
353	LOG(llevError,"New socket write failed (wsb) (%d: %s).\n",
354	errno, strerror_local(errno));
355	#endif
356	ns->status=Ns_Dead;
357	return;
358	}	452	}
359	else { /* EWOULDBLOCK */
360	/* can't write it, so store it away. */
361	ns->can_write=0;
362	return;
363	}
364	}
365	ns->outputbuffer.start += amt;
366	/* wrap back to start of buffer */
367	if (ns->outputbuffer.start==SOCKETBUFSIZE) ns->outputbuffer.start=0;
368	ns->outputbuffer.len -= amt;
369	#ifdef CS_LOGSTATS
370	cst_tot.obytes += amt;
371	cst_lst.obytes += amt;
372	#endif
373	} while (ns->outputbuffer.len>0);
374	}
375		453
376	/**	454	outputbuffer.len += len;
377	* This writes data to the socket. - It is very low level -
378	* all we try and do is write out the data to the socket
379	* provided (ns). buf is the data to write, len is the number
380	* of bytes to write. IT doesn't return anything - rather, it
381	* updates the ns structure if we get an error.
382	*/
383	void Write_To_Socket(NewSocket ns, char buf, int len)
384	{
385	int amt=0;
386	char *pos=buf;
387
388	if (ns->status == Ns_Dead \|\| !buf) {
389	LOG(llevDebug,"Write_To_Socket called with dead socket\n");
390	return;
391	}
392
393	#ifndef __GNU__ /* This caused problems on Hurd */
394	if (!ns->can_write) {
395	add_to_buffer(ns, buf, len);
396	return;
397	}
398	#endif
399	/* If we manage to write more than we wanted, take it as a bonus */
400	while (len>0) {
401
402	#ifdef WIN32 /* **win32 Write_To_Socket: change write() to send() /
403	amt=send(ns->fd, pos, len,0);
404	#else
405	do {
406	amt=write(ns->fd, pos, len);
407	} while ((amt<0) && (errno==EINTR));
408	#endif
409
410	if (amt < 0) { /* We got an error */
411	#ifdef WIN32 /* **win32 Write_To_Socket: change error handling /
412	if (amt == -1 && WSAGetLastError() !=WSAEWOULDBLOCK) {
413	LOG(llevError,"New socket write failed WTS (%d).\n",WSAGetLastError());
414	#else
415	if (errno !=EWOULDBLOCK) {
416	LOG(llevError,"New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
417	errno, strerror_local(errno));
418	#endif
419	ns->status=Ns_Dead;
420	return;
421	}
422	else { /* EWOULDBLOCK */
423	/* can't write it, so store it away. */
424	add_to_buffer(ns, pos, len);
425	ns->can_write=0;
426	return;
427	}
428	}
429	/* amt gets set to 0 above in blocking code, so we do this as
430	* an else if to make sure we don't reprocess it.
431	*/
432	else if (amt==0) {
433	LOG(llevError,"Write_To_Socket: No data written out.\n");
434	}
435	len -= amt;
436	pos += amt;
437	#ifdef CS_LOGSTATS
438	cst_tot.obytes += amt;
439	cst_lst.obytes += amt;
440	#endif
441	}
442	}	455	}
443
444		456
445	/**	457	/**
446	* Takes a string of data, and writes it out to the socket. A very handy	458	* Takes a string of data, and writes it out to the socket. A very handy
447	* shortcut function.	459	* shortcut function.
448	*/	460	*/
449	void cs_write_string(NewSocket ns, const char buf, int len)	461	void
		462	client::send_packet (packet &sl)
450	{	463	{
451	SockList sl;	464	if (destroyed ())
		465	return;
452		466
453	sl.len = len;	467	if (sl.length () >= MAXSOCKBUF)
454	sl.buf = (unsigned char*)buf;	468	{
455	Send_With_Handling(ns, &sl);	469	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
456	}	470	/* Almost certainly we've overflowed a buffer, so quit now to make
		471	* it easier to debug.
		472	*/
		473	abort ();
		474	}
457		475
		476	if (!sl.length ())
		477	return;
458		478
459	/**	479	assert (sl.hdrlen == 2);
460	* Calls Write_To_Socket to send data to the client.	480
		481	sl.buf_ [0] = sl.length () >> 8;
		482	sl.buf_ [1] = sl.length () ;
		483
		484	send (sl.buf_, sl.length () + sl.hdrlen);
		485	}
		486
		487	void
		488	client::send_packet (const char *buf, int len)
		489	{
		490	packet sl;
		491
		492	sl << data (buf, len);
		493	send_packet (sl);
		494	}
		495
		496	void
		497	client::send_packet (const char *buf)
		498	{
		499	send_packet (buf, strlen (buf));
		500	}
		501
		502	void
		503	client::send_packet_printf (const char *format, ...)
		504	{
		505	packet sl;
		506
		507	va_list ap;
		508	va_start (ap, format);
		509	sl.vprintf (format, ap);
		510	va_end (ap);
		511
		512	send_packet (sl);
		513	}
		514
		515	void
		516	client::send_drawinfo (const char *msg, int flags)
		517	{
		518	send_packet_printf ("drawinfo %d %s", flags, msg);
		519	}
		520
		521	void
		522	client::send_msg (int color, const char type, const char msg)
		523	{
		524	if (can_msg)
		525	send_packet_printf ("msg %d %s %s", color, type, msg);
		526	else if (color < 0)
		527	return; // client cannot handle this
		528	else if (strchr (msg, '<') \|\| strchr (msg, '&'))
		529	{
		530	//TODO: should escape/modify to old syntax
		531	send_packet_printf ("drawinfo %d %s", color, msg);
		532	}
		533	else
		534	send_packet_printf ("drawinfo %d %s", color, msg);
		535	}
		536
		537	/***********************************************************************
461	*	538	*
462	* The only difference in this function is that we take a SockList	539	* packet functions/utilities
463	*, and we prepend the length information.
464	*/
465	void Send_With_Handling(NewSocket ns,SockList msg)
466	{
467	unsigned char sbuf[4];
468
469	if (ns->status == Ns_Dead \|\| !msg)
470	return;
471
472	if (msg->len >= MAXSOCKBUF) {
473	LOG(llevError,"Trying to send a buffer beyond properly size, len =%d\n",
474	msg->len);
475	/* Almost certainly we've overflowed a buffer, so quite now to make
476	* it easier to debug.
477	*/
478	abort();
479	}
480	sbuf[0] = ((uint32)(msg->len) >> 8) & 0xFF;
481	sbuf[1] = ((uint32)(msg->len)) & 0xFF;
482	if (ns->status != Ns_Old)
483	Write_To_Socket(ns, (char *) sbuf, 2);
484	Write_To_Socket(ns, (char*)msg->buf, msg->len);
485	}
486
487	/**
488	* Takes a string of data, and writes it out to the socket. A very handy
489	* shortcut function.
490	*/
491	void Write_String_To_Socket(NewSocket ns, char buf, int len)
492	{
493	SockList sl;
494
495	sl.len = len;
496	sl.buf = (unsigned char*) buf;
497	Send_With_Handling(ns, &sl);
498	}
499
500
501	/******************************************************************************
502	*	540	*
503	* statistics logging functions.
504	*
505	******************************************************************************/	541	**********************************************************************/
506		542
507	#ifdef CS_LOGSTATS	543	packet::packet (const char *name)
508	/* cst_tot is for the life of the server, cst_last is for the last series of
509	* stats
510	*/
511	CS_Stats cst_tot, cst_lst;
512
513	/**
514	* Writes out the gathered stats. We clear cst_lst.
515	*/
516	void write_cs_stats(void)
517	{	544	{
518	time_t now=time(NULL);	545	reset ();
519		546
520	/* If no connections recently, don't both to log anything */	547	int len = strlen (name);
521	if (cst_lst.ibytes==0 && cst_lst.obytes==0) return;	548	memcpy (cur, name, len); cur += len;
522		549	*cur++ = ' ';
523	/* CSSTAT is put in so scripts can easily find the line */
524	LOG(llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
525	ctime(&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
526	now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes,
527	cst_lst.max_conn, now - cst_lst.time_start);
528	cst_lst.ibytes=0;
529	cst_lst.obytes=0;
530	cst_lst.max_conn=socket_info.nconns;
531	cst_lst.time_start=now;
532	}	550	}
533	#endif	551
		552	packet &packet::operator <<(const ber32 v)
		553	{
		554	enum { maxlen = 32 / 7 + 1};
		555	uint8 buf[maxlen];
		556	uint8 *p = buf + maxlen;
		557	uint32 val = v.val;
		558
		559	*--p = val & 0x7F;
		560
		561	while (val > 0x7F)
		562	{
		563	val >>= 7;
		564	*--p = (val & 0x7F) \| 0x80;
		565	}
		566
		567	return *this << data (p, buf + maxlen - p);
		568	}
		569
		570	packet &packet::operator <<(const data &v)
		571	{
		572	if (room () < v.len)
		573	reset ();
		574	else
		575	{
		576	if (v.len)
		577	{
		578	memcpy (cur, v.ptr, v.len);
		579	cur += v.len;
		580	}
		581	}
		582
		583	return *this;
		584	}
		585
		586	packet &packet::operator <<(const data8 &v)
		587	{
		588	unsigned int len = min (v.len, 0x00FF);
		589	return *this << uint8 (len) << data (v.ptr, len);
		590	}
		591
		592	packet &packet::operator <<(const data16 &v)
		593	{
		594	unsigned int len = min (v.len, 0xFFFF);
		595	return *this << uint16 (len) << data (v.ptr, len);
		596	}
		597
		598	packet &packet::operator <<(const char *v)
		599	{
		600	return *this << data (v, strlen (v ? v : 0));
		601	}
		602
		603	void
		604	packet::vprintf (const char *format, va_list ap)
		605	{
		606	int size = room ();
		607
		608	int len = vsnprintf ((char *)cur, size, format, ap);
		609
		610	if (len >= size)
		611	return reset ();
		612
		613	cur += len;
		614	}
		615

Diff Legend

-–
+Removed lines
-+
+Added lines
-<
+Changed lines
->
+Changed lines

Comparing deliantra/server/socket/lowlevel.C (file contents): Revision 1.1 by elmex, Sun Aug 13 17:16:06 2006 UTC vs. Revision 1.46 by root, Sun Jun 10 04:44:21 2007 UTC

Diff Legend

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.1 by elmex, Sun Aug 13 17:16:06 2006 UTC vs.
Revision 1.46 by root, Sun Jun 10 04:44:21 2007 UTC