[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 1.45 by root, Sun Jun 10 02:51:46 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		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	rtt = tcpi.tcpi_rtt;
		61	rttvar = tcpi.tcpi_rttvar;
70		62
71	if (tcpi.tcpi_unacked	63	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	{	64	{
		65	send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
		66	write_outputbuffer ();
		67
75	LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd,	68	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);	69	(unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
77	ns->status = Ns_Dead;	70	destroy ();
78	}	71	}
		72	}
79	}	73	}
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	74	#endif
85	}
86		75
87	/***********************************************************************	76	/**
88	*	77	* Writes data to socket.
89	* SockList functions/utilities	78	*
90	*	79	* When the socket is clear to write, and we have backlogged data, this
91	**********************************************************************/	80	* 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_AddInt(SockList *sl, uint32 data)
100	{
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	*/	81	*/
123	int GetInt_String(unsigned char *data)
124	{
125	return ((data[0]<<24) + (data[1]<<16) + (data[2]<<8) + data[3]);
126	}
127		82
128	short GetShort_String(unsigned char *data) {	83	// write a nop to the socket at least every IDLE_NOP seconds.
129	return ((data[0]<<8)+data[1]);	84	if (!outputbuffer.len)
		85	{
		86	if (last_send + IDLE_PING <= NOW)
		87	{
		88	// this is a bit ugly, but map1/map1a seem to be the only
		89	// nop'able commands and they are quite small.
		90	packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
		91	send_packet (sl);
		92	}
		93	else
		94	return;
		95	}
		96
		97	if (socket_ev.poll () & PE_W)
		98	return;
		99
		100	last_send = NOW;
		101	write_outputbuffer ();
		102	}
		103
		104	void
		105	client::write_outputbuffer ()
		106	{
		107	while (outputbuffer.len)
		108	{
		109	int res = write (fd, outputbuffer.data + outputbuffer.start,
		110	min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
		111
		112	if (res > 0)
		113	{
		114	outputbuffer.start += res;
		115	/* wrap back to start of buffer */
		116	if (outputbuffer.start == SOCKETBUFSIZE)
		117	outputbuffer.start = 0;
		118
		119	outputbuffer.len -= res;
		120	}
		121	else if (res == 0)
		122	{
		123	LOG (llevError, "socket write failed, connection closed.\n");
		124	destroy ();
		125	return;
		126	}
		127	else if (errno == EINTR)
		128	{
		129	// just retry
		130	}
		131	else if (errno == EAGAIN)
		132	{
		133	// delay till ready
		134	socket_ev.poll (socket_ev.poll () \| PE_W);
		135	socket_ev.start ();
		136	return;
		137	}
		138	else
		139	{
		140	LOG (llevError, "socket write failed: %s\n", strerror (errno));
		141	destroy ();
		142	return;
		143	}
		144	}
		145
		146	socket_ev.poll (socket_ev.poll () & ~PE_W);
130	}	147	}
131		148
132	/******************************************************************************	149	/******************************************************************************
133	*	150	*
134	* Start of read routines.	151	* Start of read routines.
135	*	152	*
136	******************************************************************************/	153	******************************************************************************/
137		154
		155	int
		156	client::next_packet ()
		157	{
		158	if (inbuf_len >= 2)
		159	{
		160	int pkt_len = (inbuf [0] << 8) \| inbuf [1];
		161
		162	if (inbuf_len >= 2 + pkt_len)
		163	return 2 + pkt_len;
		164
		165	if (inbuf_len == sizeof (inbuf))
		166	{
		167	send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED);
		168	destroy ();
		169	return -1;
		170	}
		171	}
		172
		173	return 0;
		174	}
		175
		176	void
		177	client::skip_packet (int len)
		178	{
		179	inbuf_len -= len;
		180	memmove (inbuf, inbuf + len, inbuf_len);
		181	}
		182
		183	/*****************************************************************************
		184	* Start of command dispatch area.
		185	* The commands here are protocol commands.
		186	****************************************************************************/
		187
		188	// SocketCommand, PlayingCommand, should not exist with those ugly casts
		189	#define SC(cb) (void )static_cast<void ()(char , int, client )>(cb),
		190	#define PC(cb) (void )static_cast<void ()(char , int, player )>(cb), PF_PLAYER \|
		191
138	/**	192	/**
139	* This reads from fd and puts the data in sl. We return true if we think	193	* Dispatch table for the server.
140	* we have a full packet, 0 if we have a partial packet. The only processing
141	* we do is remove the intial size value. len (As passed) is the size of the
142	* buffer allocated in the socklist. We make the assumption the buffer is
143	* at least 2 bytes long.
144	*/	194	*/
145		195	static struct packet_type packets[] = {
146	int SockList_ReadPacket(int fd, SockList *sl, int len)	196	{"ncom", PC(NewPlayerCmd) PF_PLAYING \| PF_COMMAND6 },
147	{	197	{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND0 },
148	int stat,toread;
149		198
150	/* Sanity check - shouldn't happen */	199	{"examine", PC(ExamineCmd) PF_PLAYING },
151	if (sl->len < 0) {	200	{"ex", PC(ExCmd) PF_PLAYING },
152	abort();	201	{"apply", PC(ApplyCmd) PF_PLAYING },
		202	{"lookat", PC(LookAt) PF_PLAYING },
		203	{"lock", PC(LockItem) PF_PLAYING },
		204	{"mark", PC(MarkItem) PF_PLAYING },
		205	{"move", PC(MoveCmd) PF_PLAYING },
		206	{"ext", PC(ExtCmd) 0 }, // CF+
		207	{"mapredraw", PC(MapRedrawCmd) 0 },
		208	{"mapinfo", PC(MapInfoCmd) 0 }, // CF+
		209
		210	{"reply", SC(ReplyCmd) 0 },
		211	{"exti", SC(ExtiCmd) 0 }, // CF+
		212	{"addme", SC(AddMeCmd) 0 },
		213	{"askface", SC(AskFaceCmd) 0 },
		214	{"requestinfo", SC(RequestInfo) 0 },
		215	{"setfacemode", SC(SetFaceMode) 0 },
		216	{"setsound", SC(SetSound) 0 },
		217	{"setup", SC(SetUp) 0 },
		218	{"version", SC(VersionCmd) 0 },
		219	{"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /Added: tchize /
		220	{"toggleextendedtext", SC(ToggleExtendedText) 0 }, /Added: tchize /
		221	{"asksmooth", SC(AskSmooth) 0 }, /Added: tchize (smoothing technologies) /
		222	};
		223
		224	bool
		225	client::may_execute (const packet_type *pkt) const
		226	{
		227	return (!(pkt->flags & PF_PLAYER) \|\| pl)
		228	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
		229	}
		230
		231	// HACK: some commands currently should be executed
		232	// even when the player is frozen. this hack detects
		233	// those commands. it should be folded into may_execute,
		234	// but kept seperate to emphasise the hack aspect, i.e.
		235	// do it better, then remove.
		236	static bool
		237	always_immediate (const client ns, const packet_type pkt, const char *data, int len)
		238	{
		239	if (!(pkt->flags & (PF_COMMAND0 \| PF_COMMAND6)))
		240	return false;
		241
		242	if (!ns->pl \|\| !ns->pl->ob \|\| !ns->pl->ob->map)
		243	return false;
		244
		245	if (pkt->flags & PF_COMMAND6)
		246	{
		247	data += 6;
		248	len -= 6;
		249	}
		250
		251	if (len > 4 && !strncmp (data, "say " , 4))
		252	return true;
		253	if (len > 5 && !strncmp (data, "chat ", 5))
		254	return true;
		255
		256	return false;
		257	}
		258
		259	void
		260	client::execute (const packet_type pkt, char data, int datalen)
		261	{
		262	if (may_execute (pkt) \|\| always_immediate (this, pkt, data, datalen))
		263	{
		264	//TODO: only one format
		265	if (pkt->flags & PF_PLAYER)
		266	((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
		267	else
		268	((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
		269	}
		270	else
		271	send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
		272	}
		273
		274	bool
		275	client::handle_packet ()
		276	{
		277	int pkt_len = next_packet ();
		278
		279	if (!pkt_len)
		280	return false;
		281	else if (pkt_len < 0)
		282	{
		283	LOG (llevError, "read error on player %s\n",
		284	pl && pl->ob ? &pl->ob->name : "[anonymous]");
		285	destroy ();
		286	return false;
		287	}
		288
		289	inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
		290
		291	/* First, break out beginning word. There are at least
		292	* a few commands that do not have any paremeters. If
		293	* we get such a command, don't worry about trying
		294	* to break it up.
		295	*/
		296	int datalen;
		297	char data = strchr ((char )inbuf + 2, ' ');
		298
		299	if (data)
		300	{
		301	*data++ = 0;
		302	datalen = pkt_len - (data - (char *)inbuf);
		303	}
		304	else
		305	{
		306	data = (char *)inbuf + 2; // better read garbage than segfault
		307	datalen = 0;
		308	}
		309
		310	for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
		311	if (!strcmp ((char *)inbuf + 2, pkt->name))
		312	{
		313	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
		314	queue_command (pkt, data, datalen);
		315	else
		316	execute (pkt, data, datalen);
		317
		318	goto next_packet;
153	}	319	}
154	/* We already have a partial packet */
155	if (sl->len<2) {
156	#ifdef WIN32 /* **WIN32 SockList_ReadPacket: change read() to recv() /
157		320
158	stat=recv(fd, sl->buf + sl->len, 2-sl->len,0);	321	// If we get here, we didn't find a valid command.
		322	send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
		323	next_packet:
		324	skip_packet (pkt_len);
159		325
160	#else	326	// input buffer has space again
		327	socket_ev.poll (socket_ev.poll () \| PE_R);
		328
		329	return true;
		330	}
		331
		332	// callback called when socket is either readable or writable
		333	void
		334	client::socket_cb (iow &w, int got)
		335	{
		336	//TODO remove when we have better socket cleanup logic
		337	if (destroyed ())
		338	{
		339	socket_ev.poll (0);
		340	return;
		341	}
		342
		343	if (got & PE_W)
		344	{
		345	write_outputbuffer ();
		346
		347	if (!outputbuffer.len)
		348	socket_ev.poll (socket_ev.poll () & ~PE_W);
		349	}
		350
		351	if (got & PE_R)
		352	{
		353	//TODO: rate-limit tcp connection in better ways, important
		354
		355	int amount = sizeof (inbuf) - inbuf_len;
		356
		357	if (!amount)
161	do {	358	{
162	stat=read(fd, sl->buf + sl->len, 2-sl->len);	359	// input buffer full
163	} while ((stat==-1) && (errno==EINTR));	360	socket_ev.poll (socket_ev.poll () & ~PE_R);
164	#endif	361	return;
165	if (stat<0) {	362	}
166	/* In non blocking mode, EAGAIN is set when there is no	363
167	* data available.	364	amount = read (fd, inbuf + inbuf_len, amount);
168	*/	365
169	#ifdef WIN32 /* **WIN32 SockList_ReadPacket: error handling for win32 /	366	if (!amount)
170	if ((stat==-1) && WSAGetLastError() !=WSAEWOULDBLOCK) {	367	{
171	if(WSAGetLastError() == WSAECONNRESET)	368	destroy ();
172	LOG(llevDebug,"Connection closed by client\n");	369	return;
173	else	370	}
		371	else if (amount < 0)
		372	{
		373	if (errno != EAGAIN && errno != EINTR)
174	{	374	{
175	LOG(llevDebug,"ReadPacket got error %d, returning 0\n",WSAGetLastError());	375	LOG (llevError, "read error: %s\n", strerror (errno));
176	}	376	destroy ();
177	return -1; /* kick this user! */	377	return;
178	}	378	}
179	#else	379
180	if (errno != EAGAIN && errno !=EWOULDBLOCK) {	380	// should not be here, normally
181	LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno));
182	}	381	}
183	#endif	382	else
184	return 0; /Error /
185	}	383	{
186	if (stat==0) return -1;	384	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		385
211	/* return error so the socket is closed */	386	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	}	387	}
234	#else	388	}
235	if (errno != EAGAIN && errno !=EWOULDBLOCK) {	389	}
236	LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno));	390
237	}	391	// called whenever we have additional commands to process
238	#endif	392	void
239	return 0; /Error /	393	client::cmd_cb (iw &w)
240	}	394	{
241	if (stat==0) return -1;	395	if (handle_packet ())
242	sl->len += stat;	396	w.start ();
243	#ifdef CS_LOGSTATS	397	else
244	cst_tot.ibytes += stat;	398	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	}	399	}
256		400
257	/*******************************************************************************	401	/*******************************************************************************
258	*	402	*
259	* Start of write related routines.	403	* Start of write related routines.
264	* Adds data to a socket buffer for whatever reason.	408	* Adds data to a socket buffer for whatever reason.
265	*	409	*
266	* ns is the socket we are adding the data to, buf is the start of the	410	* 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.	411	* data, and len is the number of bytes to add.
268	*/	412	*/
269		413	void
270	static void add_to_buffer(NewSocket ns, char buf, int len)	414	client::send (void *buf_, int len)
271	{	415	{
		416	char buf = (char )buf_;
		417
		418	if (destroyed () \|\| !buf)
		419	return;
		420
		421	if (len + outputbuffer.len > SOCKETBUFSIZE)
		422	{
		423	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
		424	// shutdown the socket, this is safer than destroying it immediately
		425	// as lots of code in the callchain might still access the map etc.
		426	shutdown (fd, SHUT_RDWR);
		427	return;
		428	}
		429
272	int avail, end;	430	int avail, end;
273		431
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	432	/* data + end is where we start putting the new data. The last byte
282	* currently in use is actually data + end -1	433	* currently in use is actually data + end -1
283	*/	434	*/
284
285	end=ns->outputbuffer.start + ns->outputbuffer.len;	435	end = outputbuffer.start + outputbuffer.len;
286	/* The buffer is already in a wrapped state, so adjust end */	436	/* The buffer is already in a wrapped state, so adjust end */
287	if (end>=SOCKETBUFSIZE) end-=SOCKETBUFSIZE;	437	if (end >= SOCKETBUFSIZE)
		438	end -= SOCKETBUFSIZE;
		439
288	avail=SOCKETBUFSIZE - end;	440	avail = SOCKETBUFSIZE - end;
289		441
290	/* We can all fit it behind the current data without wrapping */	442	/* We can all fit it behind the current data without wrapping */
291	if (avail >=len ) {	443	if (avail >= len)
292	memcpy(ns->outputbuffer.data + end, buf, len);	444	memcpy (outputbuffer.data + end, buf, len);
		445	else
293	}	446	{
294	else {
295	memcpy(ns->outputbuffer.data + end, buf, avail);	447	memcpy (outputbuffer.data + end, buf, avail);
296	memcpy(ns->outputbuffer.data, buf+avail, len-avail);	448	memcpy (outputbuffer.data, buf + avail, len - avail);
297	}	449	}
		450
298	ns->outputbuffer.len += len;	451	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	}	452	}
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		453
432	/**	454	/**
433	* Takes a string of data, and writes it out to the socket. A very handy	455	* Takes a string of data, and writes it out to the socket. A very handy
434	* shortcut function.	456	* shortcut function.
435	*/	457	*/
436	void cs_write_string(NewSocket ns, const char buf, int len)	458	void
		459	client::send_packet (packet &sl)
437	{	460	{
438	SockList sl;	461	if (destroyed ())
		462	return;
439		463
440	sl.len = len;	464	if (sl.length () >= MAXSOCKBUF)
441	sl.buf = (unsigned char*)buf;	465	{
442	Send_With_Handling(ns, &sl);	466	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
443	}	467	/* Almost certainly we've overflowed a buffer, so quit now to make
		468	* it easier to debug.
		469	*/
		470	abort ();
		471	}
444		472
		473	if (!sl.length ())
		474	return;
445		475
446	/**	476	assert (sl.hdrlen == 2);
447	* Calls Write_To_Socket to send data to the client.	477
		478	sl.buf_ [0] = sl.length () >> 8;
		479	sl.buf_ [1] = sl.length () ;
		480
		481	send (sl.buf_, sl.length () + sl.hdrlen);
		482	}
		483
		484	void
		485	client::send_packet (const char *buf, int len)
		486	{
		487	packet sl;
		488
		489	sl << data (buf, len);
		490	send_packet (sl);
		491	}
		492
		493	void
		494	client::send_packet (const char *buf)
		495	{
		496	send_packet (buf, strlen (buf));
		497	}
		498
		499	void
		500	client::send_packet_printf (const char *format, ...)
		501	{
		502	packet sl;
		503
		504	va_list ap;
		505	va_start (ap, format);
		506	sl.vprintf (format, ap);
		507	va_end (ap);
		508
		509	send_packet (sl);
		510	}
		511
		512	void
		513	client::send_drawinfo (const char *msg, int flags)
		514	{
		515	send_packet_printf ("drawinfo %d %s", flags, msg);
		516	}
		517
		518	void
		519	client::send_msg (int color, const char type, const char msg)
		520	{
		521	if (can_msg)
		522	send_packet_printf ("msg %d %s %s", color, type, msg);
		523	else if (color < 0)
		524	return; // client cannot handle this
		525	else if (strchr (msg, '<') \|\| strchr (msg, '&'))
		526	{
		527	//TODO: should escape/modify to old syntax
		528	send_packet_printf ("drawinfo %d %s", color, msg);
		529	}
		530	else
		531	send_packet_printf ("drawinfo %d %s", color, msg);
		532	}
		533
		534	/***********************************************************************
448	*	535	*
449	* The only difference in this function is that we take a SockList	536	* packet functions/utilities
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;
458
459	if (msg->len >= MAXSOCKBUF) {
460	LOG(llevError,"Trying to send a buffer beyond properly size, len =%d\n",
461	msg->len);
462	/* Almost certainly we've overflowed a buffer, so quite now to make
463	* it easier to debug.
464	*/
465	abort();
466	}
467	sbuf[0] = ((uint32)(msg->len) >> 8) & 0xFF;
468	sbuf[1] = ((uint32)(msg->len)) & 0xFF;
469	if (ns->status != Ns_Old)
470	Write_To_Socket(ns, (char *) sbuf, 2);
471	Write_To_Socket(ns, (char*)msg->buf, msg->len);
472	}
473
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	/******************************************************************************
489	*	537	*
490	* statistics logging functions.
491	*
492	******************************************************************************/	538	**********************************************************************/
493		539
494	#ifdef CS_LOGSTATS	540	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	{	541	{
505	time_t now=time(NULL);	542	reset ();
506		543
507	/* If no connections recently, don't both to log anything */	544	int len = strlen (name);
508	if (cst_lst.ibytes==0 && cst_lst.obytes==0) return;	545	memcpy (cur, name, len); cur += len;
509		546	*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	}	547	}
520	#endif	548
		549	packet &packet::operator <<(const ber32 v)
		550	{
		551	enum { maxlen = 32 / 7 + 1};
		552	uint8 buf[maxlen];
		553	uint8 *p = buf + maxlen;
		554	uint32 val = v.val;
		555
		556	*--p = val & 0x7F;
		557
		558	while (val > 0x7F)
		559	{
		560	val >>= 7;
		561	*--p = (val & 0x7F) \| 0x80;
		562	}
		563
		564	return *this << data (p, buf + maxlen - p);
		565	}
		566
		567	packet &packet::operator <<(const data &v)
		568	{
		569	if (room () < v.len)
		570	reset ();
		571	else
		572	{
		573	if (v.len)
		574	{
		575	memcpy (cur, v.ptr, v.len);
		576	cur += v.len;
		577	}
		578	}
		579
		580	return *this;
		581	}
		582
		583	packet &packet::operator <<(const data8 &v)
		584	{
		585	unsigned int len = min (v.len, 0x00FF);
		586	return *this << uint8 (len) << data (v.ptr, len);
		587	}
		588
		589	packet &packet::operator <<(const data16 &v)
		590	{
		591	unsigned int len = min (v.len, 0xFFFF);
		592	return *this << uint16 (len) << data (v.ptr, len);
		593	}
		594
		595	packet &packet::operator <<(const char *v)
		596	{
		597	return *this << data (v, strlen (v ? v : 0));
		598	}
		599
		600	void
		601	packet::vprintf (const char *format, va_list ap)
		602	{
		603	int size = room ();
		604
		605	int len = vsnprintf ((char *)cur, size, format, ap);
		606
		607	if (len >= size)
		608	return reset ();
		609
		610	cur += len;
		611	}
		612

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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 1.45 by root, Sun Jun 10 02:51:46 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 1.45 by root, Sun Jun 10 02:51:46 2007 UTC