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

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.7 by root, Sun Nov 26 19:48:50 2006 UTC vs.
Revision 1.88 by root, Tue Nov 6 15:11:16 2012 UTC

…		…
1	/*	1	/*
2	CrossFire, A Multiplayer game for X-windows	2	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
3		3	*
4	Copyright (C) 1992 Frank Tore Johansen	4	* Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5		5	*
6	This program is free software; you can redistribute it and/or modify	6	* Deliantra is free software: you can redistribute it and/or modify it under
7	it under the terms of the GNU General Public License as published by	7	* the terms of the Affero GNU General Public License as published by the
8	the Free Software Foundation; either version 2 of the License, or	8	* Free Software Foundation, either version 3 of the License, or (at your
9	(at your option) any later version.	9	* option) any later version.
10		10	*
11	This program is distributed in the hope that it will be useful,	11	* This program is distributed in the hope that it will be useful,
12	but WITHOUT ANY WARRANTY; without even the implied warranty of	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	GNU General Public License for more details.	14	* GNU General Public License for more details.
15		15	*
16	You should have received a copy of the GNU General Public License	16	* You should have received a copy of the Affero GNU General Public License
17	along with this program; if not, write to the Free Software	17	* and the GNU General Public License along with this program. If not, see
18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.	18	* <http://www.gnu.org/licenses/>.
19
20	The author can be reached via e-mail to mark@pyramid.com
21	*/
22
23	/**
24	* \file
25	* Low-level socket-related functions.
26	*	19	*
27	* \date 2003-12-02	20	* The authors can be reached via e-mail to <support@deliantra.net>
28	*
29	* Contains some base functions that both the client and server
30	* can use. As such, depending what we are being compiled for will
31	* determine what we can include. the client is designed have
32	* CFCLIENT defined as part of its compile flags.
33	*/	21	*/
34		22
35	using namespace std;	23	using namespace std;
36		24
37	#include <global.h>	25	#include <global.h>
38	#include <newclient.h>
39	#include <sproto.h>	26	#include <sproto.h>
		27	#include <cstdarg>
40		28
41	#ifdef __linux__	29	#if HAVE_TCP_INFO
42	# include <sys/types.h>	30	# include <sys/types.h>
43	# include <sys/socket.h>	31	# include <sys/socket.h>
44	# include <netinet/in.h>	32	# include <netinet/in.h>
45	# define TCP_HZ 1000 // sorry...
46	# include <netinet/tcp.h>	33	# include <netinet/tcp.h>
47	#endif	34	#endif
48		35
49	// use a really low timeout, as it doesn't cost any bandwidth, and you can	36	// force a packet when idle for more than this many seconds,
50	// easily die in 20 seconds...	37	// forcing an ack regularly.
51	#define SOCKET_TIMEOUT1 10	38	#define IDLE_PING 2.
52	#define SOCKET_TIMEOUT2 20
53		39
54	void	40	void
55	Socket_Flush (NewSocket * ns)	41	client::flush ()
56	{	42	{
57	#ifdef __linux__	43	if (destroyed ())
58	// check time of last ack, and, if too old, kill connection	44	return;
59	struct tcp_info tcpi;
60	socklen_t len = sizeof (tcpi);
61		45
62	if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))	46	/**
63	{	47	* Writes data to socket.
64	unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;	48	*
		49	* When the socket is clear to write, and we have backlogged data, this
		50	* is called to write it out.
		51	*/
65		52
66	if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s	53	// write a nop to the socket at least every IDLE_NOP seconds.
67	&& SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s	54	if (!outputbuffer.len)
68	{	55	{
69	LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd,	56	if (last_send + IDLE_PING <= NOW && pl && pl->active)
70	(unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
71	ns->status = Ns_Dead;
72	}	57	{
		58	// this is a bit ugly, but map1a seems to be the only
		59	// nop'able command and it is quite small.
		60	packet sl ("map1a");
		61	send_packet (sl);
		62	}
		63	else
		64	return;
		65	}
		66
		67	if (socket_ev.poll () & EV_WRITE)
		68	return;
		69
		70	last_send = NOW;
		71	write_outputbuffer ();
		72	}
		73
		74	void
		75	client::write_outputbuffer ()
		76	{
		77	while (outputbuffer.len)
73	}	78	{
		79	int res = write (fd, outputbuffer.data + outputbuffer.start,
		80	min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
74		81
75	int val;	82	if (res > 0)
		83	{
		84	outputbuffer.start += res;
		85	/* wrap back to start of buffer */
		86	if (outputbuffer.start == SOCKETBUFSIZE)
		87	outputbuffer.start = 0;
76		88
77	val = 0;	89	outputbuffer.len -= res;
78	setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));	90	}
79	val = 1;	91	else if (res == 0)
80	setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));	92	{
81	#endif	93	LOG (llevError, "socket write failed, connection closed.\n");
82	}	94	destroy ();
		95	return;
		96	}
		97	else if (errno == EINTR)
		98	{
		99	// just retry
		100	}
		101	else if (errno == EAGAIN)
		102	{
		103	// delay till ready
		104	socket_ev.poll (socket_ev.poll () \| EV_WRITE);
		105	socket_ev.start ();
		106	return;
		107	}
		108	else
		109	{
		110	LOG (llevError, "socket write failed: %s\n", strerror (errno));
		111	destroy ();
		112	return;
		113	}
		114	}
83		115
		116	socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
		117	}
		118
		119	/******************************************************************************
		120	*
		121	* Start of read routines.
		122	*
		123	******************************************************************************/
		124
		125	int
		126	client::next_packet ()
		127	{
		128	if (inbuf_len >= 2)
		129	{
		130	int pkt_len = (inbuf [0] << 8) \| inbuf [1];
		131
		132	if (inbuf_len >= 2 + pkt_len)
		133	return 2 + pkt_len;
		134
		135	if (inbuf_len == sizeof (inbuf))
		136	{
		137	send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED \| NDI_REPLY);
		138	destroy ();
		139	return -1;
		140	}
		141	}
		142
		143	return 0;
		144	}
		145
		146	void
		147	client::skip_packet (int len)
		148	{
		149	inbuf_len -= len;
		150	memmove (inbuf, inbuf + len, inbuf_len);
		151	}
		152
84	/***********************************************************************	153	/*****************************************************************************
85	*	154	* Start of command dispatch area.
86	* SockList functions/utilities	155	* The commands here are protocol commands.
87	*
88	**********************************************************************/	156	****************************************************************************/
89		157
90	void	158	// SocketCommand, PlayingCommand, should not exist with those ugly casts
91	SockList_Init (SockList * sl)	159	#define SC(cb) (void )static_cast<void ()(char , int, client )>(cb),
92	{	160	#define PC(cb) (void )static_cast<void ()(char , int, player )>(cb), PF_PLAYER \|
93	sl->len = 0;
94	sl->buf = NULL;
95	}
96		161
97	void	162	static void
98	SockList_AddInt (SockList * sl, uint32 data)	163	NopCmd (char , int, client )
99	{	164	{
100	sl->buf[sl->len++] = (data >> 24) & 0xff;	165	// do nothing
101	sl->buf[sl->len++] = (data >> 16) & 0xff;
102	sl->buf[sl->len++] = (data >> 8) & 0xff;
103	sl->buf[sl->len++] = data & 0xff;
104	}	166	}
105		167
106	void	168	/**
107	SockList_AddInt64 (SockList * sl, uint64 data)	169	* Dispatch table for the server.
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	*/	170	*/
123	int	171	static struct packet_type packets[] = {
124	GetInt_String (unsigned char *data)	172	{"ncom", PC(NewPlayerCmd) PF_PLAYING \| PF_COMMAND6 },
125	{	173	{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND0 },
126	return ((data[0] << 24) + (data[1] << 16) + (data[2] << 8) + data[3]);
127	}
128		174
129	short	175	{"examine", PC(ExamineCmd) PF_PLAYING },
130	GetShort_String (unsigned char *data)	176	{"ex", PC(ExCmd) PF_PLAYING },
131	{	177	{"apply", PC(ApplyCmd) PF_PLAYING },
132	return ((data[0] << 8) + data[1]);	178	{"lookat", PC(LookAt) PF_PLAYING },
133	}	179	{"lock", PC(LockItem) PF_PLAYING },
		180	{"mark", PC(MarkItem) PF_PLAYING },
		181	{"move", PC(MoveCmd) PF_PLAYING },
		182	{"ext", PC(ExtCmd) 0 }, // CF+/Deliantra
		183	{"mapredraw", PC(MapRedrawCmd) 0 },
		184	{"mapinfo", PC(MapInfoCmd) 0 }, // CF+/Deliantra
134		185
135	/******************************************************************************	186	{"reply", SC(ReplyCmd) 0 },
136	*	187	{"exti", SC(ExtiCmd) 0 }, // CF+/Deliantra
137	* Start of read routines.	188	{"addme", SC(AddMeCmd) 0 },
138	*	189	{"askface", SC(AskFaceCmd) 0 },
139	******************************************************************************/	190	{"requestinfo", SC(RequestInfo) 0 },
		191	{"setsound", SC(SetSound) 0 },
		192	{"setup", SC(SetUp) 0 },
		193	{"version", SC(VersionCmd) 0 },
140		194
141	/**	195	{"toggleextendedtext", SC(NopCmd) 0 }, // deliantra: disabled
142	* This reads from fd and puts the data in sl. We return true if we think	196	};
143	* we have a full packet, 0 if we have a partial packet. The only processing
144	* we do is remove the intial size value. len (As passed) is the size of the
145	* buffer allocated in the socklist. We make the assumption the buffer is
146	* at least 2 bytes long.
147	*/
148		197
149	int	198	bool
150	SockList_ReadPacket (int fd, SockList * sl, int len)	199	client::may_execute (const packet_type *pkt) const
151	{	200	{
152	int stat, toread;	201	return (!(pkt->flags & PF_PLAYER) \|\| pl)
		202	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
		203	}
153		204
154	/* Sanity check - shouldn't happen */	205	// HACK: some commands currently should be executed
155	if (sl->len < 0)	206	// even when the player is frozen. this hack detects
156	{	207	// those commands. it should be folded into may_execute,
157	abort ();	208	// but kept seperate to emphasise the hack aspect, i.e.
		209	// do it better, then remove.
		210	static bool
		211	always_immediate (const client ns, const packet_type pkt, const char *data, int len)
		212	{
		213	if (!(pkt->flags & (PF_COMMAND0 \| PF_COMMAND6)))
		214	return false;
		215
		216	if (!ns->pl \|\| !ns->pl->ob \|\| !ns->pl->ob->map)
		217	return false;
		218
		219	if (pkt->flags & PF_COMMAND6)
158	}	220	{
159	/* We already have a partial packet */	221	data += 6;
160	if (sl->len < 2)	222	len -= 6;
161	{	223	}
162	#ifdef WIN32 /* **WIN32 SockList_ReadPacket: change read() to recv() /
163		224
164	stat = recv (fd, sl->buf + sl->len, 2 - sl->len, 0);	225	if (len > 4 && data [ 3] == ' ' && !strncmp (data, "say " , 4)) return true;
		226	if (len > 5 && data [ 4] == ' ' && !strncmp (data, "chat " , 5)) return true;
		227	if (len > 6 && data [ 5] == ' ' && !strncmp (data, "shout " , 6)) return true;
		228	if (len > 8 && data [ 7] == ' ' && !strncmp (data, "suicide " , 8)) return true;
		229	if (len > 18 && data [17] == ' ' && !strncmp (data, "accept-invitation ", 18)) return true;
165		230
166	#else	231	if (len == 7 && !strcmp (data, "suicide")) return true;
167	do	232
168	{	233	return false;
169	stat = read (fd, sl->buf + sl->len, 2 - sl->len);	234	}
		235
		236	void
		237	client::execute (const packet_type pkt, char data, int datalen)
		238	{
		239	if (may_execute (pkt) \|\| always_immediate (this, pkt, data, datalen))
		240	{
		241	//TODO: only one format
		242	if (pkt->flags & PF_PLAYER)
170	}	243	{
171	while ((stat == -1) && (errno == EINTR));	244	((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
172	#endif	245	pl->need_updated_stats ();
173	if (stat < 0)
174	{	246	}
175	/* In non blocking mode, EAGAIN is set when there is no	247	else
176	* data available.	248	((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
177	*/	249	}
178	#ifdef WIN32 /* **WIN32 SockList_ReadPacket: error handling for win32 /	250	else
179	if ((stat == -1) && WSAGetLastError () != WSAEWOULDBLOCK)	251	send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED \| NDI_REPLY, pkt->name);
		252	}
		253
		254	bool
		255	client::handle_packet ()
		256	{
		257	int pkt_len = next_packet ();
		258
		259	if (!pkt_len)
		260	return false;
		261	else if (pkt_len < 0)
		262	{
		263	LOG (llevError, "read error on player %s\n",
		264	pl && pl->ob ? &pl->ob->name : "[anonymous]");
		265	destroy ();
		266	return false;
		267	}
		268
		269	uint8_t save_byte = inbuf [pkt_len]; // rather ugly
		270	inbuf [pkt_len] = 0; /* temporarily terminate buffer - useful for string data */
		271
		272	/* First, break out beginning word. There are at least
		273	* a few commands that do not have any paremeters. If
		274	* we get such a command, don't worry about trying
		275	* to break it up.
		276	*/
		277	int datalen;
		278	char data = strchr ((char )inbuf + 2, ' ');
		279
		280	if (data)
		281	{
		282	*data++ = 0;
		283	datalen = pkt_len - (data - (char *)inbuf);
		284	}
		285	else
		286	{
		287	data = (char *)inbuf + 2; // better read garbage than segfault
		288	datalen = 0;
		289	}
		290
		291	for (packet_type *pkt = packets; pkt < packets + array_length (packets); ++pkt)
		292	if (!strcmp ((char *)inbuf + 2, pkt->name))
		293	{
		294	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
		295	queue_command (pkt, data, datalen);
		296	else
		297	execute (pkt, data, datalen);
		298
		299	goto next_packet;
		300	}
		301
		302	// If we get here, we didn't find a valid command.
		303	send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED \| NDI_REPLY, (char *)inbuf + 2);
		304
		305	next_packet:
		306	inbuf [pkt_len] = save_byte; // rather ugly
		307	skip_packet (pkt_len);
		308
		309	// input buffer has space again
		310	socket_ev.poll (socket_ev.poll () \| EV_READ);
		311
		312	return true;
		313	}
		314
		315	void
		316	client::inbuf_handle ()
		317	{
		318	if (!handle_packet ())
		319	return;
		320
		321	while (handle_packet ())
		322	;
		323
		324	flush ();
		325	}
		326
		327	// callback called when socket is either readable or writable
		328	void
		329	client::socket_cb (iow &w, int revents)
		330	{
		331	//TODO remove when we have better socket cleanup logic
		332	if (destroyed ())
		333	{
		334	socket_ev.poll (0);
		335	return;
		336	}
		337
		338	if (revents & EV_WRITE)
		339	{
		340	write_outputbuffer ();
		341
		342	if (!outputbuffer.len)
		343	socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
		344	}
		345
		346	if (revents & EV_READ)
		347	{
		348	//TODO: rate-limit tcp connection in better ways, important
		349
		350	int amount = sizeof (inbuf) - inbuf_len;
		351
		352	if (!amount)
		353	{
		354	// input buffer full
		355	LOG (llevError, "input buffer overflow.");
		356	destroy ();
		357	return;
		358	}
		359
		360	if (ws_version)
		361	{
		362	if (ws_inbuf_len + 2048 > ws_inbuf_alloc)
		363	ws_inbuf = (uint8 *)realloc (ws_inbuf, ws_inbuf_alloc += 4096);
		364
		365	int len = read (fd, ws_inbuf + ws_inbuf_len, ws_inbuf_alloc - ws_inbuf_len);
		366
		367	if (len > 0)
180	{	368	{
181	if (WSAGetLastError () == WSAECONNRESET)	369	ws_inbuf_len += len;
182	LOG (llevDebug, "Connection closed by client\n");	370
183	else	371	if (ws_inbuf_len < 2 + 4) // 6 is minimum length: op, len, mask
		372	return;
		373
		374	int d = 2;
		375	int o = ws_inbuf [0] & 15;
		376	int l = ws_inbuf [1] & 127;
		377
		378	if (l == 126)
184	{	379	{
185	LOG (llevDebug, "ReadPacket got error %d, returning 0\n", WSAGetLastError ());	380	l = (ws_inbuf [2] << 8) \| ws_inbuf [3];
		381	d += 2;
186	}	382	}
187	return -1; /* kick this user! */	383	else if (l == 127)
		384	{
		385	if (ws_inbuf_len < 2 + 8)
		386	return;
		387
		388	// we don't do extra long frames, if a browser wants to send >2**32 bytes,
		389	// there are bigger issues to fix.
		390	l = (ws_inbuf [6] << 24)
		391	\| (ws_inbuf [7] << 16)
		392	\| (ws_inbuf [8] << 8)
		393	\| ws_inbuf [9];
		394	d += 8;
		395	}
		396
		397	// we only continue if we have a complete frame
		398	if (ws_inbuf_len < d + 4 + l)
		399	return;
		400
		401	switch (o)
		402	{
		403	case 0: o = ws_inbuf_type; break; // continuation
		404	case 1: ws_inbuf_type = 1; break; // utf-8
		405	case 2: ws_inbuf_type = 2; break; // binary
		406	}
		407
		408	if (l > amount)
		409	{
		410	// input buffer full
		411	LOG (llevError, "input buffer overflow (ws).");
		412	destroy ();
		413	return;
		414	}
		415
		416	for (int i = 0; i < l; ++i)
		417	inbuf [inbuf_len + i] = ws_inbuf [d + 4 + i] ^ ws_inbuf [d + (i & 3)];
		418
		419	// remove frame
		420	ws_inbuf_len -= d + 4 + l;
		421	memmove (ws_inbuf, ws_inbuf + d + 4 + l, ws_inbuf_len);
		422
		423	switch (o)
		424	{
		425	case 1: // utf-8
		426	{
		427	uint8 *a = inbuf + inbuf_len;
		428	uint8 *b = a;
		429	uint8 *c = a + l;
		430
		431	for (; a < c; ++a, ++b)
		432	{
		433	b = a;
		434
		435	if (*a >= 0x80)
		436	*b = (a [0] & 0x1f) << 6 \| (a [1] & 0x3f), ++a;
		437	}
		438
		439	l -= a - b;
		440	}
		441	break;
		442	case 2: // binary
		443	break;
		444
		445	case 9: // ping
		446	{
		447	// send pong - we assume ping messages are <64k
		448	// as we can't handle >10k at the moment anyway.
		449	uint8 hdr [] = { 0x8a, 126, l >> 8, l };
		450	send (hdr, sizeof (hdr));
		451	send (inbuf + inbuf_len, l);
		452	}
		453	return;
		454
		455	case 10: // pong
		456	return;
		457
		458	case 8: // close
		459	default:
		460	destroy ();
		461	return;
		462	}
		463
		464	amount = l;
188	}	465	}
189	#else	466	else
		467	amount = -1;
		468	}
		469	else
		470	amount = read (fd, inbuf + inbuf_len, amount);
		471
		472	if (!amount)
		473	{
		474	destroy ();
		475	return;
		476	}
		477	else if (amount < 0)
		478	{
190	if (errno != EAGAIN && errno != EWOULDBLOCK)	479	if (errno != EAGAIN && errno != EINTR)
191	{	480	{
192	LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));	481	LOG (llevError, "read error: %s\n", strerror (errno));
		482	destroy ();
		483	return;
193	}	484	}
194	#endif
195	return 0; /Error /
196	}
197	if (stat == 0)
198	return -1;
199	sl->len += stat;
200	#ifdef CS_LOGSTATS
201	cst_tot.ibytes += stat;
202	cst_lst.ibytes += stat;
203	#endif
204	if (stat < 2)
205	return 0; /* Still don't have a full packet */
206	}
207	/* Figure out how much more data we need to read. Add 2 from the
208	* end of this - size header information is not included.
209	*/
210	toread = 2 + (sl->buf[0] << 8) + sl->buf[1] - sl->len;
211	if ((toread + sl->len) >= len)
212	{
213	LOG (llevError, "SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n", 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		485
224	/* return error so the socket is closed */	486	// should not be here, normally
225	return -1;
226	}
227	do
228	{
229	#ifdef WIN32 /* **win32 SockList_ReadPacket: change read() to recv() /
230	stat = recv (fd, sl->buf + sl->len, toread, 0);
231	#else
232	do
233	{	487	}
234	stat = read (fd, sl->buf + sl->len, toread);	488	else
235	}	489	{
236	while ((stat < 0) && (errno == EINTR));	490	inbuf_len += amount;
237	#endif	491	inbuf_handle ();
238	if (stat < 0)
239	{	492	}
240
241	#ifdef WIN32 /* **win32 SockList_ReadPacket: change error handling for win32 /
242	if ((stat == -1) && WSAGetLastError () != WSAEWOULDBLOCK)
243	{
244	if (WSAGetLastError () == WSAECONNRESET)
245	LOG (llevDebug, "Connection closed by client\n");
246	else
247	{
248	LOG (llevDebug, "ReadPacket got error %d, returning 0\n", WSAGetLastError ());
249	}
250	return -1; /* kick this user! */
251	}
252	#else
253	if (errno != EAGAIN && errno != EWOULDBLOCK)
254	{
255	LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));
256	}
257	#endif
258	return 0; /Error /
259	}
260	if (stat == 0)
261	return -1;
262	sl->len += stat;
263	#ifdef CS_LOGSTATS
264	cst_tot.ibytes += stat;
265	cst_lst.ibytes += stat;
266	#endif
267	toread -= stat;
268	if (toread == 0)
269	return 1;
270	if (toread < 0)
271	{
272	LOG (llevError, "SockList_ReadPacket: Read more bytes than desired.\n");
273	return 1;
274	}
275	}	493	}
276	while (toread > 0);
277	return 0;
278	}	494	}
279		495
280	/*******************************************************************************	496	/*******************************************************************************
281	*	497	*
282	* Start of write related routines.	498	* Start of write related routines.
287	* Adds data to a socket buffer for whatever reason.	503	* Adds data to a socket buffer for whatever reason.
288	*	504	*
289	* ns is the socket we are adding the data to, buf is the start of the	505	* ns is the socket we are adding the data to, buf is the start of the
290	* data, and len is the number of bytes to add.	506	* data, and len is the number of bytes to add.
291	*/	507	*/
292		508	void
293	static void	509	client::send (void *buf_, int len)
294	add_to_buffer (NewSocket * ns, char *buf, int len)
295	{	510	{
		511	char buf = (char )buf_;
		512
		513	if (destroyed () \|\| !buf)
		514	return;
		515
		516	if (len + outputbuffer.len > SOCKETBUFSIZE)
		517	{
		518	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
		519	// shutdown the socket, this is safer than destroying it immediately
		520	// as lots of code in the callchain might still access the map etc.
		521	shutdown (fd, SHUT_RDWR);
		522	return;
		523	}
		524
296	int avail, end;	525	int avail, end;
297
298	if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
299	{
300	LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
301	ns->status = Ns_Dead;
302	return;
303	}
304		526
305	/* data + end is where we start putting the new data. The last byte	527	/* data + end is where we start putting the new data. The last byte
306	* currently in use is actually data + end -1	528	* currently in use is actually data + end -1
307	*/	529	*/
308
309	end = ns->outputbuffer.start + ns->outputbuffer.len;	530	end = outputbuffer.start + outputbuffer.len;
310	/* The buffer is already in a wrapped state, so adjust end */	531	/* The buffer is already in a wrapped state, so adjust end */
311	if (end >= SOCKETBUFSIZE)	532	if (end >= SOCKETBUFSIZE)
312	end -= SOCKETBUFSIZE;	533	end -= SOCKETBUFSIZE;
313		534
314	avail = SOCKETBUFSIZE - end;	535	avail = SOCKETBUFSIZE - end;
315		536
316	/* We can all fit it behind the current data without wrapping */	537	/* We can all fit it behind the current data without wrapping */
317	if (avail >= len)	538	if (avail >= len)
318	memcpy (ns->outputbuffer.data + end, buf, len);	539	memcpy (outputbuffer.data + end, buf, len);
319	else	540	else
320	{	541	{
321	memcpy (ns->outputbuffer.data + end, buf, avail);	542	memcpy (outputbuffer.data + end, buf, avail);
322	memcpy (ns->outputbuffer.data, buf + avail, len - avail);	543	memcpy (outputbuffer.data, buf + avail, len - avail);
323	}	544	}
324		545
325	ns->outputbuffer.len += len;	546	outputbuffer.len += len;
326	#if 0
327	LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
328	#endif
329	}	547	}
330
331	/**
332	* Writes data to socket.
333	*
334	* When the socket is clear to write, and we have backlogged data, this
335	* is called to write it out.
336	*/
337	void
338	write_socket_buffer (NewSocket * ns)
339	{
340	int amt, max;
341
342	if (ns->outputbuffer.len == 0)
343	{
344	LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
345	return;
346	}
347
348	do
349	{
350	max = SOCKETBUFSIZE - ns->outputbuffer.start;
351	if (ns->outputbuffer.len < max)
352	max = ns->outputbuffer.len;
353
354	#ifdef WIN32 /* **win32 write_socket_buffer: change write() to send() /
355	amt = send (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max, 0);
356	#else
357	do
358	{
359	amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
360	}
361	while ((amt < 0) && (errno == EINTR));
362	#endif
363
364	if (amt < 0)
365	{ /* We got an error */
366
367	#ifdef WIN32 /* **win32 write_socket_buffer: change error handling /
368	if (amt == -1 && WSAGetLastError () != WSAEWOULDBLOCK)
369	{
370	LOG (llevError, "New socket write failed (wsb) (%d).\n", WSAGetLastError ());
371	#else
372	if (errno != EWOULDBLOCK)
373	{
374	LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
375	#endif
376	ns->status = Ns_Dead;
377	return;
378	}
379	else
380	{ /* EWOULDBLOCK */
381	/* can't write it, so store it away. */
382	ns->can_write = 0;
383	return;
384	}
385	}
386	ns->outputbuffer.start += amt;
387	/* wrap back to start of buffer */
388	if (ns->outputbuffer.start == SOCKETBUFSIZE)
389	ns->outputbuffer.start = 0;
390	ns->outputbuffer.len -= amt;
391	#ifdef CS_LOGSTATS
392	cst_tot.obytes += amt;
393	cst_lst.obytes += amt;
394	#endif
395	}
396	while (ns->outputbuffer.len > 0);
397	}
398
399	/**
400	* This writes data to the socket. - It is very low level -
401	* all we try and do is write out the data to the socket
402	* provided (ns). buf is the data to write, len is the number
403	* of bytes to write. IT doesn't return anything - rather, it
404	* updates the ns structure if we get an error.
405	*/
406	void
407	Write_To_Socket (NewSocket * ns, char *buf, int len)
408	{
409	int amt = 0;
410	char *pos = buf;
411
412	if (ns->status == Ns_Dead \|\| !buf)
413	{
414	LOG (llevDebug, "Write_To_Socket called with dead socket\n");
415	return;
416	}
417
418	#ifndef __GNU__ /* This caused problems on Hurd */
419	if (!ns->can_write)
420	{
421	add_to_buffer (ns, buf, len);
422	return;
423	}
424	#endif
425	/* If we manage to write more than we wanted, take it as a bonus */
426	while (len > 0)
427	{
428
429	#ifdef WIN32 /* **win32 Write_To_Socket: change write() to send() /
430	amt = send (ns->fd, pos, len, 0);
431	#else
432	do
433	{
434	amt = write (ns->fd, pos, len);
435	}
436	while ((amt < 0) && (errno == EINTR));
437	#endif
438
439	if (amt < 0)
440	{ /* We got an error */
441	#ifdef WIN32 /* **win32 Write_To_Socket: change error handling /
442	if (amt == -1 && WSAGetLastError () != WSAEWOULDBLOCK)
443	{
444	LOG (llevError, "New socket write failed WTS (%d).\n", WSAGetLastError ());
445	#else
446	if (errno != EWOULDBLOCK)
447	{
448	LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
449	errno, strerror (errno));
450	#endif
451	ns->status = Ns_Dead;
452	return;
453	}
454	else
455	{ /* EWOULDBLOCK */
456	/* can't write it, so store it away. */
457	add_to_buffer (ns, pos, len);
458	ns->can_write = 0;
459	return;
460	}
461	}
462	/* amt gets set to 0 above in blocking code, so we do this as
463	* an else if to make sure we don't reprocess it.
464	*/
465	else if (amt == 0)
466	{
467	LOG (llevError, "Write_To_Socket: No data written out.\n");
468	}
469	len -= amt;
470	pos += amt;
471	#ifdef CS_LOGSTATS
472	cst_tot.obytes += amt;
473	cst_lst.obytes += amt;
474	#endif
475	}
476	}
477
478		548
479	/**	549	/**
480	* Takes a string of data, and writes it out to the socket. A very handy	550	* Takes a string of data, and writes it out to the socket. A very handy
481	* shortcut function.	551	* shortcut function.
482	*/	552	*/
483	void	553	void
484	cs_write_string (NewSocket * ns, const char *buf, int len)	554	client::send_packet (packet &sl)
485	{	555	{
486	SockList sl;	556	if (destroyed ())
487
488	sl.len = len;
489	sl.buf = (unsigned char *) buf;
490	Send_With_Handling (ns, &sl);
491	}
492
493
494	/**
495	* Calls Write_To_Socket to send data to the client.
496	*
497	* The only difference in this function is that we take a SockList
498	*, and we prepend the length information.
499	*/
500	void
501	Send_With_Handling (NewSocket * ns, SockList * msg)
502	{
503	unsigned char sbuf[4];
504
505	if (ns->status == Ns_Dead \|\| !msg)
506	return;	557	return;
507		558
508	if (msg->len >= MAXSOCKBUF)	559	if (sl.length () > MAXSOCKBUF)
509	{	560	{
510	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len);	561	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
511	/* Almost certainly we've overflowed a buffer, so quite now to make	562	/* Almost certainly we've overflowed a buffer, so quit now to make
512	* it easier to debug.	563	* it easier to debug.
513	*/	564	*/
514	abort ();	565	abort ();
515	}	566	}
516	sbuf[0] = ((uint32) (msg->len) >> 8) & 0xFF;
517	sbuf[1] = ((uint32) (msg->len)) & 0xFF;
518	if (ns->status != Ns_Old)
519	Write_To_Socket (ns, (char *) sbuf, 2);
520	Write_To_Socket (ns, (char *) msg->buf, msg->len);
521	}
522		567
523	/**	568	if (!sl.length ())
524	* Takes a string of data, and writes it out to the socket. A very handy
525	* shortcut function.
526	*/
527	void
528	Write_String_To_Socket (NewSocket * ns, char *buf, int len)
529	{
530	SockList sl;
531
532	sl.len = len;
533	sl.buf = (unsigned char *) buf;
534	Send_With_Handling (ns, &sl);
535	}
536
537
538	/******************************************************************************
539	*
540	* statistics logging functions.
541	*
542	******************************************************************************/
543
544	#ifdef CS_LOGSTATS
545
546	/* cst_tot is for the life of the server, cst_last is for the last series of
547	* stats
548	*/
549	CS_Stats cst_tot, cst_lst;
550
551	/**
552	* Writes out the gathered stats. We clear cst_lst.
553	*/
554	void
555	write_cs_stats (void)
556	{
557	time_t now = time (NULL);
558
559	/* If no connections recently, don't both to log anything */
560	if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
561	return;	569	return;
562		570
563	/* CSSTAT is put in so scripts can easily find the line */	571	if (ws_version == 8)
564	LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",	572	{
565	ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,	573	static uint8 buf [MAXSOCKBUF * 2 + 4];
566	now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);	574
567	cst_lst.ibytes = 0;	575	uint8 *b = buf + 4;
568	cst_lst.obytes = 0;	576	for (uint8 *a = sl.buf_ + sl.hdrlen; a < sl.cur; ++a)
569	cst_lst.max_conn = socket_info.nconns;	577	{
570	cst_lst.time_start = now;	578	if (*a < 0x80)
		579	b++ = a;
		580	else
		581	{
		582	b++ = 0xc0 \| ((a >> 6) & 0x1f);
		583	b++ = 0x80 \| ( a & 0x3f);
		584	}
		585	}
		586
		587	assert (b - buf < sizeof (buf));
		588
		589	int l = b - (buf + 4);
		590
		591	if (l < 126)
		592	{
		593	buf [2] = 0x81;
		594	buf [3] = l;
		595
		596	send (buf + 2, l + 2);
		597	}
		598	else
		599	{
		600	buf [0] = 0x81;
		601	buf [1] = 126;
		602	buf [2] = l >> 8;
		603	buf [3] = l;
		604
		605	send (buf, l + 4);
		606	}
		607	}
		608	else if (ws_version == 13)
		609	{
		610	int l = sl.length ();
		611
		612	if (l < 126)
		613	{
		614	uint8 hdr [] = { 0x82, 126, l >> 8, l };
		615	send (hdr, sizeof (hdr));
		616	}
		617	else
		618	{
		619	uint8 hdr [] = { 0x82, l };
		620	send (hdr, sizeof (hdr));
		621	}
		622
		623	send (sl.buf_ + sl.hdrlen, l);
		624	}
		625	else
		626	{
		627	assert (sl.hdrlen == 2);
		628
		629	sl.buf_ [0] = sl.length () >> 8;
		630	sl.buf_ [1] = sl.length () ;
		631
		632	send (sl.buf_, sl.length () + sl.hdrlen);
		633	}
571	}	634	}
572	#endif	635
		636	void
		637	client::send_packet (const char *buf, int len)
		638	{
		639	packet sl;
		640
		641	sl << data (buf, len);
		642	send_packet (sl);
		643	}
		644
		645	void
		646	client::send_packet (const char *buf)
		647	{
		648	send_packet (buf, strlen (buf));
		649	}
		650
		651	void
		652	client::send_packet_printf (const char *format, ...)
		653	{
		654	packet sl;
		655
		656	va_list ap;
		657	va_start (ap, format);
		658	sl.vprintf (format, ap);
		659	va_end (ap);
		660
		661	send_packet (sl);
		662	}
		663
		664	void
		665	client::send_msg (int color, const char type, const char msg)
		666	{
		667	if (!msg \|\| !type) // it can happen (for example, missing attack messages cause this)
		668	{
		669	LOG (logBacktrace \| llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
		670	return;
		671	}
		672
		673	int len = strlen (msg);
		674
		675	if (!(color & NDI_VERBATIM)
		676	&& (msg_is_special (msg)
		677	\|\| (type [0] == 'c' && type [1] == '/') \|\| len > (MAXSOCKBUF - 128)))
		678	cfperl_send_msg (this, color, type, msg);
		679	else
		680	send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
		681	}
		682
		683	void
		684	client::send_drawinfo (const char *msg, int flags)
		685	{
		686	send_msg (flags, "log", msg);
		687	}
		688
		689	/***********************************************************************
		690	*
		691	* packet functions/utilities
		692	*
		693	**********************************************************************/
		694
		695	packet::packet (const char *name)
		696	{
		697	reset ();
		698
		699	int len = strlen (name);
		700	memcpy (cur, name, len); cur += len;
		701	*cur++ = ' ';
		702	}
		703
		704	packet &packet::operator <<(const ber32 v)
		705	{
		706	enum { maxlen = 32 / 7 + 1 };
		707	uint8 buf[maxlen];
		708	uint8 *p = buf + maxlen;
		709	uint32 val = v.val;
		710
		711	*--p = val & 0x7F;
		712
		713	while (val > 0x7F)
		714	{
		715	val >>= 7;
		716	*--p = (val & 0x7F) \| 0x80;
		717	}
		718
		719	return *this << data (p, buf + maxlen - p);
		720	}
		721
		722	packet &packet::operator <<(const data &v)
		723	{
		724	if (room () < v.len)
		725	reset ();
		726	else
		727	{
		728	if (v.len)
		729	{
		730	memcpy (cur, v.ptr, v.len);
		731	cur += v.len;
		732	}
		733	}
		734
		735	return *this;
		736	}
		737
		738	packet &packet::operator <<(const data8 &v)
		739	{
		740	unsigned int len = min (v.len, 0x00FF);
		741	return *this << uint8 (len) << data (v.ptr, len);
		742	}
		743
		744	packet &packet::operator <<(const data16 &v)
		745	{
		746	unsigned int len = min (v.len, 0xFFFF);
		747	return *this << uint16 (len) << data (v.ptr, len);
		748	}
		749
		750	packet &packet::operator <<(const char *v)
		751	{
		752	return *this << data (v, strlen (v ? v : 0));
		753	}
		754
		755	void
		756	packet::vprintf (const char *format, va_list ap)
		757	{
		758	int size = room ();
		759
		760	int len = vsnprintf ((char *)cur, size, format, ap);
		761
		762	if (len >= size)
		763	return reset ();
		764
		765	cur += len;
		766	}
		767

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Comparing deliantra/server/socket/lowlevel.C (file contents): Revision 1.7 by root, Sun Nov 26 19:48:50 2006 UTC vs. Revision 1.88 by root, Tue Nov 6 15:11:16 2012 UTC

Diff Legend

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.7 by root, Sun Nov 26 19:48:50 2006 UTC vs.
Revision 1.88 by root, Tue Nov 6 15:11:16 2012 UTC