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

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.8 by pippijn, Mon Dec 11 19:46:47 2006 UTC vs.
Revision 1.91 by root, Thu Nov 8 02:50:14 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_PING 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	do	224
163	{	225	if (len > 4 && data [ 3] == ' ' && !strncmp (data, "say " , 4)) return true;
164	stat = read (fd, sl->buf + sl->len, 2 - sl->len);	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;
		230
		231	if (len == 7 && !strcmp (data, "suicide")) return true;
		232
		233	return false;
		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)
165	}	243	{
166	while ((stat == -1) && (errno == EINTR));	244	((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
167		245	pl->need_updated_stats ();
168	if (stat < 0)
169	{	246	}
170	/* In non blocking mode, EAGAIN is set when there is no	247	else
171	* data available.	248	((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
172	*/	249	}
		250	else
		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	int amount;
		349	uint8 *rbuf;
		350
		351	if (ws_version)
		352	{
		353	if (ws_inbuf_len + 2048 > ws_inbuf_alloc)
		354	ws_inbuf = (uint8 *)realloc (ws_inbuf, ws_inbuf_alloc += 4096);
		355
		356	rbuf = ws_inbuf + ws_inbuf_len;
		357	amount = ws_inbuf_alloc - ws_inbuf_len;
		358	}
		359	else
		360	{
		361	rbuf = inbuf + inbuf_len;
		362	amount = sizeof (inbuf) - inbuf_len;
		363	}
		364
		365	if (!amount)
		366	{
		367	// input buffer full
		368	LOG (llevError, "input buffer overflow.");
		369	destroy ();
		370	return;
		371	}
		372
		373	amount = read (fd, rbuf, amount);
		374
		375	if (!amount)
		376	{
		377	destroy ();
		378	return;
		379	}
		380	else if (amount < 0)
		381	{
173	if (errno != EAGAIN && errno != EWOULDBLOCK)	382	if (errno != EAGAIN && errno != EINTR)
174	{	383	{
175	LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));	384	LOG (llevError, "read error: %s\n", strerror (errno));
		385	destroy ();
		386	return;
176	}	387	}
177	return 0; /Error /
178	}
179	if (stat == 0)
180	return -1;
181	sl->len += stat;
182	#ifdef CS_LOGSTATS
183	cst_tot.ibytes += stat;
184	cst_lst.ibytes += stat;
185	#endif
186	if (stat < 2)
187	return 0; /* Still don't have a full packet */
188	}
189	/* Figure out how much more data we need to read. Add 2 from the
190	* end of this - size header information is not included.
191	*/
192	toread = 2 + (sl->buf[0] << 8) + sl->buf[1] - sl->len;
193	if ((toread + sl->len) >= len)
194	{
195	LOG (llevError, "SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n", toread + sl->len, len);
196	/* Quick hack in case for 'oldsocketmode' input. If we are
197	* closing the socket anyways, then reading this extra 100 bytes
198	* shouldn't hurt.
199	*/
200	read (fd, sl->buf + 2, 100);
201		388
202	/* return error so the socket is closed */	389	// should not be here, normally
203	return -1;
204	}
205	do
206	{
207	do
208	{	390	}
209	stat = read (fd, sl->buf + sl->len, toread);	391
		392	if (ws_version)
210	}	393	{
211	while ((stat < 0) && (errno == EINTR));	394	ws_inbuf_len += amount;
212	if (stat < 0)
213	{
214		395
215	if (errno != EAGAIN && errno != EWOULDBLOCK)	396	while (ws_inbuf_len)
216	{	397	{
217	LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));	398	if (ws_inbuf_len < 2 + 4) // 6 is minimum length: op, len, mask
		399	break;
		400
		401	int d = 2;
		402	int fin = ws_inbuf [0] & 0x80;
		403	int op = ws_inbuf [0] & 0x0f;
		404	int len = ws_inbuf [1] & 0x7f;
		405
		406	if (len == 126)
		407	{
		408	len = (ws_inbuf [2] << 8) \| ws_inbuf [3];
		409	d += 2;
		410	}
		411	else if (len == 127)
		412	{
		413	if (ws_inbuf_len < 2 + 8)
		414	return;
		415
		416	// we don't do extra long frames, if a browser wants to send >2**32 bytes,
		417	// there are bigger issues to fix.
		418	len = (ws_inbuf [8] << 8) \| ws_inbuf [9];
		419	d += 8;
		420	}
		421
		422	// we only continue if we have a complete frame
		423	if (ws_inbuf_len < d + 4 + len)
		424	return;
		425
		426	switch (op)
		427	{
		428	case 0: op = ws_inbuf_type; break; // continuation
		429	case 1: ws_inbuf_type = 1; break; // utf-8
		430	case 2: ws_inbuf_type = 2; break; // binary
		431	}
		432
		433	if (len > sizeof (inbuf) - inbuf_len)
		434	{
		435	// input buffer full
		436	LOG (llevError, "input buffer overflow (ws).");
		437	destroy ();
		438	return;
		439	}
		440
		441	uint8 *buf = inbuf + inbuf_len + 2;
		442
		443	for (int i = 0; i < len; ++i)
		444	buf [i] = ws_inbuf [d + 4 + i] ^ ws_inbuf [d + (i & 3)];
		445
		446	// remove frame
		447	ws_inbuf_len -= d + 4 + len;
		448	memmove (ws_inbuf, ws_inbuf + d + 4 + len, ws_inbuf_len);
		449
		450	switch (op)
		451	{
		452	case 1: // utf-8
		453	// utf-8 encoded frames cannot have full length (MAXSOCKBUF) in all cases
		454	// but we assume that these extra-long packets will be rare.
		455	{
		456	uint8 *a = buf;
		457	uint8 *b = a;
		458	uint8 *c = a + len;
		459
		460	for (; a < c; ++a, ++b)
		461	{
		462	b = a;
		463
		464	if (*a >= 0x80)
		465	*b = (a [0] & 0x1f) << 6 \| (a [1] & 0x3f), ++a;
		466	}
		467
		468	len -= a - b;
		469	}
		470	/* FALLTHROUGH */
		471	case 2: // binary
		472	inbuf_len += len;
		473
		474	if (fin)
		475	{
		476	inbuf [0] = inbuf_len >> 8;
		477	inbuf [1] = inbuf_len;
		478
		479	inbuf_len += 2;
		480
		481	inbuf_handle ();
		482	}
		483	break;
		484
		485	case 9: // ping
		486	{
		487	// send pong - we assume ping messages are <64k
		488	// as we can't handle >10k at the moment anyway.
		489	uint8 hdr [] = { 0x8a, 126, len >> 8, len };
		490	send (hdr, sizeof (hdr));
		491	send (inbuf + inbuf_len, len);
		492	}
		493	break;
		494
		495	case 10: // pong
		496	break;
		497
		498	case 8: // close
		499	default:
		500	destroy ();
		501	return;
		502	}
218	}	503	}
219	return 0; /Error /
220	}
221	if (stat == 0)
222	return -1;
223	sl->len += stat;
224	#ifdef CS_LOGSTATS
225	cst_tot.ibytes += stat;
226	cst_lst.ibytes += stat;
227	#endif
228	toread -= stat;
229	if (toread == 0)
230	return 1;
231	if (toread < 0)
232	{	504	}
233	LOG (llevError, "SockList_ReadPacket: Read more bytes than desired.\n");	505	else
234	return 1;
235	}	506	{
		507	inbuf_len += amount;
		508	inbuf_handle ();
		509	}
236	}	510	}
237	while (toread > 0);
238	return 0;
239	}	511	}
240		512
241	/*******************************************************************************	513	/*******************************************************************************
242	*	514	*
243	* Start of write related routines.	515	* Start of write related routines.
248	* Adds data to a socket buffer for whatever reason.	520	* Adds data to a socket buffer for whatever reason.
249	*	521	*
250	* ns is the socket we are adding the data to, buf is the start of the	522	* ns is the socket we are adding the data to, buf is the start of the
251	* data, and len is the number of bytes to add.	523	* data, and len is the number of bytes to add.
252	*/	524	*/
253		525	void
254	static void	526	client::send (void *buf_, int len)
255	add_to_buffer (NewSocket * ns, char *buf, int len)
256	{	527	{
		528	char buf = (char )buf_;
		529
		530	if (destroyed () \|\| !buf)
		531	return;
		532
		533	if (len + outputbuffer.len > SOCKETBUFSIZE)
		534	{
		535	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
		536	// shutdown the socket, this is safer than destroying it immediately
		537	// as lots of code in the callchain might still access the map etc.
		538	shutdown (fd, SHUT_RDWR);
		539	return;
		540	}
		541
257	int avail, end;	542	int avail, end;
258
259	if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
260	{
261	LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
262	ns->status = Ns_Dead;
263	return;
264	}
265		543
266	/* data + end is where we start putting the new data. The last byte	544	/* data + end is where we start putting the new data. The last byte
267	* currently in use is actually data + end -1	545	* currently in use is actually data + end -1
268	*/	546	*/
269
270	end = ns->outputbuffer.start + ns->outputbuffer.len;	547	end = outputbuffer.start + outputbuffer.len;
271	/* The buffer is already in a wrapped state, so adjust end */	548	/* The buffer is already in a wrapped state, so adjust end */
272	if (end >= SOCKETBUFSIZE)	549	if (end >= SOCKETBUFSIZE)
273	end -= SOCKETBUFSIZE;	550	end -= SOCKETBUFSIZE;
274		551
275	avail = SOCKETBUFSIZE - end;	552	avail = SOCKETBUFSIZE - end;
276		553
277	/* We can all fit it behind the current data without wrapping */	554	/* We can all fit it behind the current data without wrapping */
278	if (avail >= len)	555	if (avail >= len)
279	memcpy (ns->outputbuffer.data + end, buf, len);	556	memcpy (outputbuffer.data + end, buf, len);
280	else	557	else
281	{	558	{
282	memcpy (ns->outputbuffer.data + end, buf, avail);	559	memcpy (outputbuffer.data + end, buf, avail);
283	memcpy (ns->outputbuffer.data, buf + avail, len - avail);	560	memcpy (outputbuffer.data, buf + avail, len - avail);
284	}	561	}
285		562
286	ns->outputbuffer.len += len;	563	outputbuffer.len += len;
287	#if 0
288	LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
289	#endif
290	}	564	}
291
292	/**
293	* Writes data to socket.
294	*
295	* When the socket is clear to write, and we have backlogged data, this
296	* is called to write it out.
297	*/
298	void
299	write_socket_buffer (NewSocket * ns)
300	{
301	int amt, max;
302
303	if (ns->outputbuffer.len == 0)
304	{
305	LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
306	return;
307	}
308
309	do
310	{
311	max = SOCKETBUFSIZE - ns->outputbuffer.start;
312	if (ns->outputbuffer.len < max)
313	max = ns->outputbuffer.len;
314
315	do
316	{
317	amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
318	}
319	while ((amt < 0) && (errno == EINTR));
320
321	if (amt < 0)
322	{ /* We got an error */
323
324	if (errno != EWOULDBLOCK)
325	{
326	LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
327	ns->status = Ns_Dead;
328	return;
329	}
330	else
331	{ /* EWOULDBLOCK */
332	/* can't write it, so store it away. */
333	ns->can_write = 0;
334	return;
335	}
336	}
337	ns->outputbuffer.start += amt;
338	/* wrap back to start of buffer */
339	if (ns->outputbuffer.start == SOCKETBUFSIZE)
340	ns->outputbuffer.start = 0;
341	ns->outputbuffer.len -= amt;
342	#ifdef CS_LOGSTATS
343	cst_tot.obytes += amt;
344	cst_lst.obytes += amt;
345	#endif
346	}
347	while (ns->outputbuffer.len > 0);
348	}
349
350	/**
351	* This writes data to the socket. - It is very low level -
352	* all we try and do is write out the data to the socket
353	* provided (ns). buf is the data to write, len is the number
354	* of bytes to write. IT doesn't return anything - rather, it
355	* updates the ns structure if we get an error.
356	*/
357	void
358	Write_To_Socket (NewSocket * ns, char *buf, int len)
359	{
360	int amt = 0;
361	char *pos = buf;
362
363	if (ns->status == Ns_Dead \|\| !buf)
364	{
365	LOG (llevDebug, "Write_To_Socket called with dead socket\n");
366	return;
367	}
368
369	#ifndef __GNU__ /* This caused problems on Hurd */
370	if (!ns->can_write)
371	{
372	add_to_buffer (ns, buf, len);
373	return;
374	}
375	#endif
376	/* If we manage to write more than we wanted, take it as a bonus */
377	while (len > 0)
378	{
379
380	do
381	{
382	amt = write (ns->fd, pos, len);
383	}
384	while ((amt < 0) && (errno == EINTR));
385
386	if (amt < 0)
387	{ /* We got an error */
388	if (errno != EWOULDBLOCK)
389	{
390	LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
391	errno, strerror (errno));
392	ns->status = Ns_Dead;
393	return;
394	}
395	else
396	{ /* EWOULDBLOCK */
397	/* can't write it, so store it away. */
398	add_to_buffer (ns, pos, len);
399	ns->can_write = 0;
400	return;
401	}
402	}
403	/* amt gets set to 0 above in blocking code, so we do this as
404	* an else if to make sure we don't reprocess it.
405	*/
406	else if (amt == 0)
407	{
408	LOG (llevError, "Write_To_Socket: No data written out.\n");
409	}
410	len -= amt;
411	pos += amt;
412	#ifdef CS_LOGSTATS
413	cst_tot.obytes += amt;
414	cst_lst.obytes += amt;
415	#endif
416	}
417	}
418
419		565
420	/**	566	/**
421	* Takes a string of data, and writes it out to the socket. A very handy	567	* Takes a string of data, and writes it out to the socket. A very handy
422	* shortcut function.	568	* shortcut function.
423	*/	569	*/
424	void	570	void
425	cs_write_string (NewSocket * ns, const char *buf, int len)	571	client::send_packet (packet &sl)
426	{	572	{
427	SockList sl;	573	if (destroyed ())
428
429	sl.len = len;
430	sl.buf = (unsigned char *) buf;
431	Send_With_Handling (ns, &sl);
432	}
433
434
435	/**
436	* Calls Write_To_Socket to send data to the client.
437	*
438	* The only difference in this function is that we take a SockList
439	*, and we prepend the length information.
440	*/
441	void
442	Send_With_Handling (NewSocket * ns, SockList * msg)
443	{
444	unsigned char sbuf[4];
445
446	if (ns->status == Ns_Dead \|\| !msg)
447	return;	574	return;
448		575
449	if (msg->len >= MAXSOCKBUF)	576	if (sl.length () > MAXSOCKBUF)
450	{	577	{
451	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len);	578	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
452	/* Almost certainly we've overflowed a buffer, so quite now to make	579	/* Almost certainly we've overflowed a buffer, so quit now to make
453	* it easier to debug.	580	* it easier to debug.
454	*/	581	*/
455	abort ();	582	abort ();
456	}	583	}
457	sbuf[0] = ((uint32) (msg->len) >> 8) & 0xFF;
458	sbuf[1] = ((uint32) (msg->len)) & 0xFF;
459	if (ns->status != Ns_Old)
460	Write_To_Socket (ns, (char *) sbuf, 2);
461	Write_To_Socket (ns, (char *) msg->buf, msg->len);
462	}
463		584
464	/**	585	if (!sl.length ())
465	* Takes a string of data, and writes it out to the socket. A very handy
466	* shortcut function.
467	*/
468	void
469	Write_String_To_Socket (NewSocket * ns, char *buf, int len)
470	{
471	SockList sl;
472
473	sl.len = len;
474	sl.buf = (unsigned char *) buf;
475	Send_With_Handling (ns, &sl);
476	}
477
478
479	/******************************************************************************
480	*
481	* statistics logging functions.
482	*
483	******************************************************************************/
484
485	#ifdef CS_LOGSTATS
486
487	/* cst_tot is for the life of the server, cst_last is for the last series of
488	* stats
489	*/
490	CS_Stats cst_tot, cst_lst;
491
492	/**
493	* Writes out the gathered stats. We clear cst_lst.
494	*/
495	void
496	write_cs_stats (void)
497	{
498	time_t now = time (NULL);
499
500	/* If no connections recently, don't both to log anything */
501	if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
502	return;	586	return;
503		587
504	/* CSSTAT is put in so scripts can easily find the line */	588	if (ws_version == 8)
505	LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",	589	{
506	ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,	590	static uint8 buf [MAXSOCKBUF * 2 + 4];
507	now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);	591
508	cst_lst.ibytes = 0;	592	uint8 *b = buf + 4;
509	cst_lst.obytes = 0;	593	for (uint8 *a = sl.buf_ + sl.hdrlen; a < sl.cur; ++a)
510	cst_lst.max_conn = socket_info.nconns;	594	{
511	cst_lst.time_start = now;	595	if (*a < 0x80)
		596	b++ = a;
		597	else
		598	{
		599	b++ = 0xc0 \| ((a >> 6) & 0x1f);
		600	b++ = 0x80 \| ( a & 0x3f);
		601	}
		602	}
		603
		604	assert (b - buf < sizeof (buf));
		605
		606	int len = b - (buf + 4);
		607
		608	if (len < 126)
		609	{
		610	buf [2] = 0x81;
		611	buf [3] = len;
		612
		613	send (buf + 2, len + 2);
		614	}
		615	else
		616	{
		617	buf [0] = 0x81;
		618	buf [1] = 126;
		619	buf [2] = len >> 8;
		620	buf [3] = len;
		621
		622	send (buf, len + 4);
		623	}
		624	}
		625	else if (ws_version == 13)
		626	{
		627	int len = sl.length ();
		628
		629	if (len < 126)
		630	{
		631	uint8 hdr [] = { 0x82, len };
		632	send (hdr, sizeof (hdr));
		633	}
		634	else
		635	{
		636	uint8 hdr [] = { 0x82, 126, len >> 8, len };
		637	send (hdr, sizeof (hdr));
		638	}
		639
		640	send (sl.buf_ + sl.hdrlen, len);
		641	}
		642	else
		643	{
		644	assert (sl.hdrlen == 2);
		645
		646	sl.buf_ [0] = sl.length () >> 8;
		647	sl.buf_ [1] = sl.length () ;
		648
		649	send (sl.buf_, sl.length () + sl.hdrlen);
		650	}
512	}	651	}
513	#endif	652
		653	void
		654	client::send_packet (const char *buf, int len)
		655	{
		656	packet sl;
		657
		658	sl << data (buf, len);
		659	send_packet (sl);
		660	}
		661
		662	void
		663	client::send_packet (const char *buf)
		664	{
		665	send_packet (buf, strlen (buf));
		666	}
		667
		668	void
		669	client::send_packet_printf (const char *format, ...)
		670	{
		671	packet sl;
		672
		673	va_list ap;
		674	va_start (ap, format);
		675	sl.vprintf (format, ap);
		676	va_end (ap);
		677
		678	send_packet (sl);
		679	}
		680
		681	void
		682	client::send_msg (int color, const char type, const char msg)
		683	{
		684	if (!msg \|\| !type) // it can happen (for example, missing attack messages cause this)
		685	{
		686	LOG (logBacktrace \| llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
		687	return;
		688	}
		689
		690	int len = strlen (msg);
		691
		692	if (!(color & NDI_VERBATIM)
		693	&& (msg_is_special (msg)
		694	\|\| (type [0] == 'c' && type [1] == '/') \|\| len > (MAXSOCKBUF - 128)))
		695	cfperl_send_msg (this, color, type, msg);
		696	else
		697	send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
		698	}
		699
		700	void
		701	client::send_drawinfo (const char *msg, int flags)
		702	{
		703	send_msg (flags, "log", msg);
		704	}
		705
		706	/***********************************************************************
		707	*
		708	* packet functions/utilities
		709	*
		710	**********************************************************************/
		711
		712	packet::packet (const char *name)
		713	{
		714	reset ();
		715
		716	int len = strlen (name);
		717	memcpy (cur, name, len); cur += len;
		718	*cur++ = ' ';
		719	}
		720
		721	packet &packet::operator <<(const ber32 v)
		722	{
		723	enum { maxlen = 32 / 7 + 1 };
		724	uint8 buf[maxlen];
		725	uint8 *p = buf + maxlen;
		726	uint32 val = v.val;
		727
		728	*--p = val & 0x7F;
		729
		730	while (val > 0x7F)
		731	{
		732	val >>= 7;
		733	*--p = (val & 0x7F) \| 0x80;
		734	}
		735
		736	return *this << data (p, buf + maxlen - p);
		737	}
		738
		739	packet &packet::operator <<(const data &v)
		740	{
		741	if (room () < v.len)
		742	reset ();
		743	else
		744	{
		745	if (v.len)
		746	{
		747	memcpy (cur, v.ptr, v.len);
		748	cur += v.len;
		749	}
		750	}
		751
		752	return *this;
		753	}
		754
		755	packet &packet::operator <<(const data8 &v)
		756	{
		757	unsigned int len = min (v.len, 0x00FF);
		758	return *this << uint8 (len) << data (v.ptr, len);
		759	}
		760
		761	packet &packet::operator <<(const data16 &v)
		762	{
		763	unsigned int len = min (v.len, 0xFFFF);
		764	return *this << uint16 (len) << data (v.ptr, len);
		765	}
		766
		767	packet &packet::operator <<(const char *v)
		768	{
		769	return *this << data (v, strlen (v ? v : 0));
		770	}
		771
		772	void
		773	packet::vprintf (const char *format, va_list ap)
		774	{
		775	int size = room ();
		776
		777	int len = vsnprintf ((char *)cur, size, format, ap);
		778
		779	if (len >= size)
		780	return reset ();
		781
		782	cur += len;
		783	}
		784

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Comparing deliantra/server/socket/lowlevel.C (file contents): Revision 1.8 by pippijn, Mon Dec 11 19:46:47 2006 UTC vs. Revision 1.91 by root, Thu Nov 8 02:50:14 2012 UTC

Diff Legend

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.8 by pippijn, Mon Dec 11 19:46:47 2006 UTC vs.
Revision 1.91 by root, Thu Nov 8 02:50:14 2012 UTC