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

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.4 by root, Wed Aug 30 16:30:37 2006 UTC vs.
Revision 1.54 by root, Sun Jul 29 02:24:34 2007 UTC

…		…
1
2	/*	1	/*
3	* static char *rcsid_sockets_c =	2	* This file is part of Crossfire TRT, the Roguelike Realtime MORPG.
4	* "$Id: lowlevel.C,v 1.4 2006/08/30 16:30:37 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
		8	* it under the terms of the GNU General Public License as published by
		9	* the Free Software Foundation, either version 3 of the License, or
		10	* (at your option) any later version.
		11	*
		12	* This program is distributed in the hope that it will be useful,
		13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
		14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		15	* GNU General Public License for more details.
		16	*
		17	* You should have received a copy of the GNU General Public License
		18	* along with this program. If not, see <http://www.gnu.org/licenses/>.
		19	*
		20	* The authors can be reached via e-mail to <crossfire@schmorp.de>
5	*/	21	*/
6		22
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;	23	using namespace std;
42		24
43	#include <global.h>	25	#include <global.h>
44	#include <newclient.h>
45	#include <sproto.h>	26	#include <sproto.h>
		27	#include <cstdarg>
46		28
47	#ifdef __linux__	29	#if HAVE_TCP_INFO
48	# include <sys/types.h>	30	# include <sys/types.h>
49	# include <sys/socket.h>	31	# include <sys/socket.h>
50	# include <netinet/in.h>	32	# include <netinet/in.h>
51	# define TCP_HZ 1000 // sorry...
52	# include <netinet/tcp.h>	33	# include <netinet/tcp.h>
53	#endif	34	#endif
54		35
55	// use a really low timeout, as it doesn't cost any bandwidth, and you can	36	// disconnect a socket after this many seconds without an ack
56	// easily die in 20 seconds...
57	#define SOCKET_TIMEOUT1 10	37	#define SOCKET_TIMEOUT 8.
58	#define SOCKET_TIMEOUT2 20
59		38
60	void Socket_Flush (NewSocket *ns)	39	// force a packet when idle for more than this many seconds,
		40	// forcing an ack regularly.
		41	#define IDLE_PING 2.
		42
		43	void
		44	client::flush ()
61	{	45	{
62	#ifdef __linux__	46	if (destroyed ())
		47	return;
		48
		49	#if HAVE_TCP_INFO
63	// check time of last ack, and, if too old, kill connection	50	// check time of last ack, and, if too old, kill connection
64	struct tcp_info tcpi;
65	socklen_t len = sizeof (tcpi);	51	socklen_t len = sizeof (tcpi);
66		52
67	if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))	53	if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
68	{	54	{
69	unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
70
71	if (tcpi.tcpi_unacked	55	if (tcpi.tcpi_snd_mss)
72	&& SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s	56	mss = tcpi.tcpi_snd_mss;
73	&& SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s	57
		58	#if 0
		59	fprintf (stderr, "uack %d ack %d lost %d ret %d fack %d sst %d cwnd %d mss %d pmtu %d advmss %d EXC %d\n",
		60	tcpi.tcpi_unacked,
		61	tcpi.tcpi_sacked,
		62	tcpi.tcpi_lost,
		63	tcpi.tcpi_retrans,
		64	tcpi.tcpi_fackets,
		65	tcpi.tcpi_snd_ssthresh, tcpi.tcpi_snd_cwnd, tcpi.tcpi_advmss, tcpi.tcpi_pmtu, tcpi.tcpi_advmss,
		66
		67	tcpi.tcpi_snd_cwnd - (tcpi.tcpi_unacked - tcpi.tcpi_sacked));
		68	#endif
		69
		70	// do this only when player is active
		71	if (pl && pl->active
		72	&& tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
74	{	73	{
		74	send_msg (NDI_RED \| NDI_REPLY, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
		75	write_outputbuffer ();
		76
75	LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd,	77	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);	78	(unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
77	ns->status = Ns_Dead;	79	destroy ();
78	}	80	}
79	}	81	}
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	82	#endif
85	}
86		83
87	/***********************************************************************	84	/**
88	*	85	* Writes data to socket.
89	* SockList functions/utilities	86	*
90	*	87	* When the socket is clear to write, and we have backlogged data, this
91	**********************************************************************/	88	* 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	*/	89	*/
123	int GetInt_String(unsigned char *data)
124	{
125	return ((data[0]<<24) + (data[1]<<16) + (data[2]<<8) + data[3]);
126	}
127		90
128	short GetShort_String(unsigned char *data) {	91	// write a nop to the socket at least every IDLE_NOP seconds.
129	return ((data[0]<<8)+data[1]);	92	if (!outputbuffer.len)
		93	{
		94	if (last_send + IDLE_PING <= NOW && pl && pl->active)
		95	{
		96	// this is a bit ugly, but map1/map1a seem to be the only
		97	// nop'able commands and they are quite small.
		98	packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
		99	send_packet (sl);
		100	}
		101	else
		102	return;
		103	}
		104
		105	if (socket_ev.poll () & PE_W)
		106	return;
		107
		108	last_send = NOW;
		109	write_outputbuffer ();
		110	}
		111
		112	void
		113	client::write_outputbuffer ()
		114	{
		115	while (outputbuffer.len)
		116	{
		117	int res = write (fd, outputbuffer.data + outputbuffer.start,
		118	min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
		119
		120	if (res > 0)
		121	{
		122	outputbuffer.start += res;
		123	/* wrap back to start of buffer */
		124	if (outputbuffer.start == SOCKETBUFSIZE)
		125	outputbuffer.start = 0;
		126
		127	outputbuffer.len -= res;
		128	}
		129	else if (res == 0)
		130	{
		131	LOG (llevError, "socket write failed, connection closed.\n");
		132	destroy ();
		133	return;
		134	}
		135	else if (errno == EINTR)
		136	{
		137	// just retry
		138	}
		139	else if (errno == EAGAIN)
		140	{
		141	// delay till ready
		142	socket_ev.poll (socket_ev.poll () \| PE_W);
		143	socket_ev.start ();
		144	return;
		145	}
		146	else
		147	{
		148	LOG (llevError, "socket write failed: %s\n", strerror (errno));
		149	destroy ();
		150	return;
		151	}
		152	}
		153
		154	socket_ev.poll (socket_ev.poll () & ~PE_W);
130	}	155	}
131		156
132	/******************************************************************************	157	/******************************************************************************
133	*	158	*
134	* Start of read routines.	159	* Start of read routines.
135	*	160	*
136	******************************************************************************/	161	******************************************************************************/
137		162
		163	int
		164	client::next_packet ()
		165	{
		166	if (inbuf_len >= 2)
		167	{
		168	int pkt_len = (inbuf [0] << 8) \| inbuf [1];
		169
		170	if (inbuf_len >= 2 + pkt_len)
		171	return 2 + pkt_len;
		172
		173	if (inbuf_len == sizeof (inbuf))
		174	{
		175	send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED \| NDI_REPLY);
		176	destroy ();
		177	return -1;
		178	}
		179	}
		180
		181	return 0;
		182	}
		183
		184	void
		185	client::skip_packet (int len)
		186	{
		187	inbuf_len -= len;
		188	memmove (inbuf, inbuf + len, inbuf_len);
		189	}
		190
		191	/*****************************************************************************
		192	* Start of command dispatch area.
		193	* The commands here are protocol commands.
		194	****************************************************************************/
		195
		196	// SocketCommand, PlayingCommand, should not exist with those ugly casts
		197	#define SC(cb) (void )static_cast<void ()(char , int, client )>(cb),
		198	#define PC(cb) (void )static_cast<void ()(char , int, player )>(cb), PF_PLAYER \|
		199
138	/**	200	/**
139	* This reads from fd and puts the data in sl. We return true if we think	201	* 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	*/	202	*/
145		203	static struct packet_type packets[] = {
146	int SockList_ReadPacket(int fd, SockList *sl, int len)	204	{"ncom", PC(NewPlayerCmd) PF_PLAYING \| PF_COMMAND6 },
147	{	205	{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND0 },
148	int stat,toread;
149		206
150	/* Sanity check - shouldn't happen */	207	{"examine", PC(ExamineCmd) PF_PLAYING },
151	if (sl->len < 0) {	208	{"ex", PC(ExCmd) PF_PLAYING },
152	abort();	209	{"apply", PC(ApplyCmd) PF_PLAYING },
		210	{"lookat", PC(LookAt) PF_PLAYING },
		211	{"lock", PC(LockItem) PF_PLAYING },
		212	{"mark", PC(MarkItem) PF_PLAYING },
		213	{"move", PC(MoveCmd) PF_PLAYING },
		214	{"ext", PC(ExtCmd) 0 }, // CF+
		215	{"mapredraw", PC(MapRedrawCmd) 0 },
		216	{"mapinfo", PC(MapInfoCmd) 0 }, // CF+
		217
		218	{"reply", SC(ReplyCmd) 0 },
		219	{"exti", SC(ExtiCmd) 0 }, // CF+
		220	{"addme", SC(AddMeCmd) 0 },
		221	{"askface", SC(AskFaceCmd) 0 },
		222	{"requestinfo", SC(RequestInfo) 0 },
		223	{"setfacemode", SC(SetFaceMode) 0 },
		224	{"setsound", SC(SetSound) 0 },
		225	{"setup", SC(SetUp) 0 },
		226	{"version", SC(VersionCmd) 0 },
		227	{"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /Added: tchize /
		228	{"toggleextendedtext", SC(ToggleExtendedText) 0 }, /Added: tchize /
		229	{"asksmooth", SC(AskSmooth) 0 }, /Added: tchize (smoothing technologies) /
		230	};
		231
		232	bool
		233	client::may_execute (const packet_type *pkt) const
		234	{
		235	return (!(pkt->flags & PF_PLAYER) \|\| pl)
		236	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
		237	}
		238
		239	// HACK: some commands currently should be executed
		240	// even when the player is frozen. this hack detects
		241	// those commands. it should be folded into may_execute,
		242	// but kept seperate to emphasise the hack aspect, i.e.
		243	// do it better, then remove.
		244	static bool
		245	always_immediate (const client ns, const packet_type pkt, const char *data, int len)
		246	{
		247	if (!(pkt->flags & (PF_COMMAND0 \| PF_COMMAND6)))
		248	return false;
		249
		250	if (!ns->pl \|\| !ns->pl->ob \|\| !ns->pl->ob->map)
		251	return false;
		252
		253	if (pkt->flags & PF_COMMAND6)
		254	{
		255	data += 6;
		256	len -= 6;
		257	}
		258
		259	if (len > 4 && !strncmp (data, "say " , 4))
		260	return true;
		261	if (len > 5 && !strncmp (data, "chat ", 5))
		262	return true;
		263
		264	return false;
		265	}
		266
		267	void
		268	client::execute (const packet_type pkt, char data, int datalen)
		269	{
		270	if (may_execute (pkt) \|\| always_immediate (this, pkt, data, datalen))
		271	{
		272	//TODO: only one format
		273	if (pkt->flags & PF_PLAYER)
		274	((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
		275	else
		276	((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
		277	}
		278	else
		279	send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED \| NDI_REPLY, pkt->name);
		280	}
		281
		282	bool
		283	client::handle_packet ()
		284	{
		285	int pkt_len = next_packet ();
		286
		287	if (!pkt_len)
		288	return false;
		289	else if (pkt_len < 0)
		290	{
		291	LOG (llevError, "read error on player %s\n",
		292	pl && pl->ob ? &pl->ob->name : "[anonymous]");
		293	destroy ();
		294	return false;
		295	}
		296
		297	inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
		298
		299	/* First, break out beginning word. There are at least
		300	* a few commands that do not have any paremeters. If
		301	* we get such a command, don't worry about trying
		302	* to break it up.
		303	*/
		304	int datalen;
		305	char data = strchr ((char )inbuf + 2, ' ');
		306
		307	if (data)
		308	{
		309	*data++ = 0;
		310	datalen = pkt_len - (data - (char *)inbuf);
		311	}
		312	else
		313	{
		314	data = (char *)inbuf + 2; // better read garbage than segfault
		315	datalen = 0;
		316	}
		317
		318	for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
		319	if (!strcmp ((char *)inbuf + 2, pkt->name))
		320	{
		321	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
		322	queue_command (pkt, data, datalen);
		323	else
		324	execute (pkt, data, datalen);
		325
		326	goto next_packet;
153	}	327	}
154	/* We already have a partial packet */
155	if (sl->len<2) {
156	#ifdef WIN32 /* **WIN32 SockList_ReadPacket: change read() to recv() /
157		328
158	stat=recv(fd, sl->buf + sl->len, 2-sl->len,0);	329	// If we get here, we didn't find a valid command.
		330	send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED \| NDI_REPLY, (char *)inbuf + 2);
		331	next_packet:
		332	skip_packet (pkt_len);
159		333
160	#else	334	// input buffer has space again
		335	socket_ev.poll (socket_ev.poll () \| PE_R);
		336
		337	return true;
		338	}
		339
		340	// callback called when socket is either readable or writable
		341	void
		342	client::socket_cb (iow &w, int got)
		343	{
		344	//TODO remove when we have better socket cleanup logic
		345	if (destroyed ())
		346	{
		347	socket_ev.poll (0);
		348	return;
		349	}
		350
		351	if (got & PE_W)
		352	{
		353	write_outputbuffer ();
		354
		355	if (!outputbuffer.len)
		356	socket_ev.poll (socket_ev.poll () & ~PE_W);
		357	}
		358
		359	if (got & PE_R)
		360	{
		361	//TODO: rate-limit tcp connection in better ways, important
		362
		363	int amount = sizeof (inbuf) - inbuf_len;
		364
		365	if (!amount)
161	do {	366	{
162	stat=read(fd, sl->buf + sl->len, 2-sl->len);	367	// input buffer full
163	} while ((stat==-1) && (errno==EINTR));	368	socket_ev.poll (socket_ev.poll () & ~PE_R);
164	#endif	369	return;
165	if (stat<0) {	370	}
166	/* In non blocking mode, EAGAIN is set when there is no	371
167	* data available.	372	amount = read (fd, inbuf + inbuf_len, amount);
168	*/	373
169	#ifdef WIN32 /* **WIN32 SockList_ReadPacket: error handling for win32 /	374	if (!amount)
170	if ((stat==-1) && WSAGetLastError() !=WSAEWOULDBLOCK) {	375	{
171	if(WSAGetLastError() == WSAECONNRESET)	376	destroy ();
172	LOG(llevDebug,"Connection closed by client\n");	377	return;
173	else	378	}
		379	else if (amount < 0)
		380	{
		381	if (errno != EAGAIN && errno != EINTR)
174	{	382	{
175	LOG(llevDebug,"ReadPacket got error %d, returning 0\n",WSAGetLastError());	383	LOG (llevError, "read error: %s\n", strerror (errno));
176	}	384	destroy ();
177	return -1; /* kick this user! */	385	return;
178	}	386	}
179	#else	387
180	if (errno != EAGAIN && errno !=EWOULDBLOCK) {	388	// should not be here, normally
181	LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror(errno));
182	}	389	}
183	#endif	390	else
184	return 0; /Error /
185	}	391	{
186	if (stat==0) return -1;	392	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		393
211	/* return error so the socket is closed */	394	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	}	395	}
234	#else	396	}
235	if (errno != EAGAIN && errno !=EWOULDBLOCK) {	397	}
236	LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror(errno));	398
237	}	399	// called whenever we have additional commands to process
238	#endif	400	void
239	return 0; /Error /	401	client::cmd_cb (iw &w)
240	}	402	{
241	if (stat==0) return -1;	403	if (handle_packet ())
242	sl->len += stat;	404	w.start ();
243	#ifdef CS_LOGSTATS	405	else
244	cst_tot.ibytes += stat;	406	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	}	407	}
256		408
257	/*******************************************************************************	409	/*******************************************************************************
258	*	410	*
259	* Start of write related routines.	411	* Start of write related routines.
264	* Adds data to a socket buffer for whatever reason.	416	* Adds data to a socket buffer for whatever reason.
265	*	417	*
266	* ns is the socket we are adding the data to, buf is the start of the	418	* 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.	419	* data, and len is the number of bytes to add.
268	*/	420	*/
269		421	void
270	static void add_to_buffer(NewSocket ns, char buf, int len)	422	client::send (void *buf_, int len)
271	{	423	{
		424	char buf = (char )buf_;
		425
		426	if (destroyed () \|\| !buf)
		427	return;
		428
		429	if (len + outputbuffer.len > SOCKETBUFSIZE)
		430	{
		431	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
		432	// shutdown the socket, this is safer than destroying it immediately
		433	// as lots of code in the callchain might still access the map etc.
		434	shutdown (fd, SHUT_RDWR);
		435	return;
		436	}
		437
272	int avail, end;	438	int avail, end;
273		439
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	440	/* data + end is where we start putting the new data. The last byte
282	* currently in use is actually data + end -1	441	* currently in use is actually data + end -1
283	*/	442	*/
284
285	end=ns->outputbuffer.start + ns->outputbuffer.len;	443	end = outputbuffer.start + outputbuffer.len;
286	/* The buffer is already in a wrapped state, so adjust end */	444	/* The buffer is already in a wrapped state, so adjust end */
287	if (end>=SOCKETBUFSIZE) end-=SOCKETBUFSIZE;	445	if (end >= SOCKETBUFSIZE)
		446	end -= SOCKETBUFSIZE;
		447
288	avail=SOCKETBUFSIZE - end;	448	avail = SOCKETBUFSIZE - end;
289		449
290	/* We can all fit it behind the current data without wrapping */	450	/* We can all fit it behind the current data without wrapping */
291	if (avail >=len ) {	451	if (avail >= len)
292	memcpy(ns->outputbuffer.data + end, buf, len);	452	memcpy (outputbuffer.data + end, buf, len);
		453	else
293	}	454	{
294	else {
295	memcpy(ns->outputbuffer.data + end, buf, avail);	455	memcpy (outputbuffer.data + end, buf, avail);
296	memcpy(ns->outputbuffer.data, buf+avail, len-avail);	456	memcpy (outputbuffer.data, buf + avail, len - avail);
297	}	457	}
		458
298	ns->outputbuffer.len += len;	459	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	}	460	}
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(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(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		461
432	/**	462	/**
433	* Takes a string of data, and writes it out to the socket. A very handy	463	* Takes a string of data, and writes it out to the socket. A very handy
434	* shortcut function.	464	* shortcut function.
435	*/	465	*/
436	void cs_write_string(NewSocket ns, const char buf, int len)	466	void
		467	client::send_packet (packet &sl)
437	{	468	{
438	SockList sl;	469	if (destroyed ())
		470	return;
439		471
440	sl.len = len;	472	if (sl.length () >= MAXSOCKBUF)
441	sl.buf = (unsigned char*)buf;	473	{
442	Send_With_Handling(ns, &sl);	474	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
443	}	475	/* Almost certainly we've overflowed a buffer, so quit now to make
		476	* it easier to debug.
		477	*/
		478	abort ();
		479	}
444		480
		481	if (!sl.length ())
		482	return;
445		483
446	/**	484	assert (sl.hdrlen == 2);
447	* Calls Write_To_Socket to send data to the client.	485
		486	sl.buf_ [0] = sl.length () >> 8;
		487	sl.buf_ [1] = sl.length () ;
		488
		489	send (sl.buf_, sl.length () + sl.hdrlen);
		490	}
		491
		492	void
		493	client::send_packet (const char *buf, int len)
		494	{
		495	packet sl;
		496
		497	sl << data (buf, len);
		498	send_packet (sl);
		499	}
		500
		501	void
		502	client::send_packet (const char *buf)
		503	{
		504	send_packet (buf, strlen (buf));
		505	}
		506
		507	void
		508	client::send_packet_printf (const char *format, ...)
		509	{
		510	packet sl;
		511
		512	va_list ap;
		513	va_start (ap, format);
		514	sl.vprintf (format, ap);
		515	va_end (ap);
		516
		517	send_packet (sl);
		518	}
		519
		520	// returns true when the message needs special (read: perl) treatment
		521	static bool
		522	msg_is_special (const char *msg)
		523	{
		524	return msg [strcspn (msg, "<[&\n")];
		525	}
		526
		527	void
		528	client::send_msg (int color, const char type, const char msg)
		529	{
		530	if (msg_is_special (msg))
		531	cfperl_send_msg (this, color, type, msg);
		532	else if (can_msg)
		533	send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
		534	else if (color < 0)
		535	return; // client cannot handle this
		536	else
		537	send_packet_printf ("drawinfo %d %s", color & NDI_COLOR_MASK, msg);
		538	}
		539
		540	void
		541	client::send_drawinfo (const char *msg, int flags)
		542	{
		543	send_msg (flags, "log", msg);
		544	}
		545
		546	/***********************************************************************
448	*	547	*
449	* The only difference in this function is that we take a SockList	548	* 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	*	549	*
490	* statistics logging functions.
491	*
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 1.4 by root, Wed Aug 30 16:30:37 2006 UTC vs. Revision 1.54 by root, Sun Jul 29 02:24:34 2007 UTC

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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.4 by root, Wed Aug 30 16:30:37 2006 UTC vs.
Revision 1.54 by root, Sun Jul 29 02:24:34 2007 UTC