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

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.3 by root, Tue Aug 29 08:01:38 2006 UTC vs.
Revision 1.93 by root, Sat Nov 17 06:05:34 2012 UTC

…		…
1
2	/*	1	/*
3	* static char *rcsid_sockets_c =	2	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
4	* "$Id: lowlevel.C,v 1.3 2006/08/29 08:01:38 root Exp $";	3	*
		4	* Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
		5	*
		6	* Deliantra is free software: you can redistribute it and/or modify it under
		7	* the terms of the Affero GNU General Public License as published by the
		8	* Free Software Foundation, either version 3 of the License, or (at your
		9	* option) any later version.
		10	*
		11	* This program is distributed in the hope that it will be useful,
		12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
		13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		14	* GNU General Public License for more details.
		15	*
		16	* You should have received a copy of the Affero GNU General Public License
		17	* and the GNU General Public License along with this program. If not, see
		18	* <http://www.gnu.org/licenses/>.
		19	*
		20	* The authors can be reached via e-mail to <support@deliantra.net>
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	// force a packet when idle for more than this many seconds,
56	// easily die in 20 seconds...	37	// forcing an ack regularly.
57	#define SOCKET_TIMEOUT1 10	38	#define IDLE_PING 2.
58	#define SOCKET_TIMEOUT2 20
59		39
60	void Socket_Flush (NewSocket *ns)	40	void
		41	client::flush ()
61	{	42	{
62	#ifdef __linux__	43	if (destroyed ())
63	// check time of last ack, and, if too old, kill connection	44	return;
64	struct tcp_info tcpi;
65	socklen_t len = sizeof (tcpi);
66		45
67	if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))	46	/**
68	{	47	* Writes data to socket.
69	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	*/
70		52
71	if (tcpi.tcpi_unacked	53	// write a nop to the socket at least every IDLE_PING seconds.
72	&& SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s	54	if (!outputbuffer.len)
73	&& SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s	55	{
74	{	56	if (last_send + IDLE_PING <= NOW && pl && pl->active)
75	LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd,
76	(unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
77	ns->status = Ns_Dead;
78	}	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)
79	}	78	{
		79	int res = write (fd, outputbuffer.data + outputbuffer.start,
		80	min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
80		81
81	int val;	82	if (res > 0)
82	val = 0; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));	83	{
83	val = 1; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));	84	outputbuffer.start += res;
84	#endif	85	/* wrap back to start of buffer */
85	}	86	if (outputbuffer.start == SOCKETBUFSIZE)
		87	outputbuffer.start = 0;
86		88
		89	outputbuffer.len -= res;
		90	}
		91	else if (res == 0)
		92	{
		93	LOG (llevError, "socket write failed, connection closed.\n");
		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	}
		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 ("msg %d 0 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
87	/***********************************************************************	153	/*****************************************************************************
88	*	154	* Start of command dispatch area.
89	* SockList functions/utilities	155	* The commands here are protocol commands.
90	*
91	**********************************************************************/	156	****************************************************************************/
92		157
93	void SockList_Init(SockList *sl)	158	// SocketCommand, PlayingCommand, should not exist with those ugly casts
94	{	159	#define SC(cb) (void )static_cast<void ()(char , int, client )>(cb),
95	sl->len=0;	160	#define PC(cb) (void )static_cast<void ()(char , int, player )>(cb), PF_PLAYER \|
96	sl->buf=NULL;
97	}
98		161
99	void SockList_AddInt(SockList *sl, uint32 data)	162	static void
		163	NopCmd (char , int, client )
100	{	164	{
101	sl->buf[sl->len++]= (data>>24)&0xff;	165	// do nothing
102	sl->buf[sl->len++]= (data>>16)&0xff;
103	sl->buf[sl->len++]= (data>>8)&0xff;
104	sl->buf[sl->len++] = data & 0xff;
105	}	166	}
106		167
107	void SockList_AddInt64(SockList *sl, uint64 data)	168	/**
108	{	169	* Dispatch table for the server.
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 GetInt_String(unsigned char *data)	171	static struct packet_type packets[] = {
124	{	172	{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND },
125	return ((data[0]<<24) + (data[1]<<16) + (data[2]<<8) + data[3]);
126	}
127		173
128	short GetShort_String(unsigned char *data) {	174	{"examine", PC(ExamineCmd) PF_PLAYING },
129	return ((data[0]<<8)+data[1]);	175	{"ex", PC(ExCmd) PF_PLAYING },
130	}	176	{"apply", PC(ApplyCmd) PF_PLAYING },
		177	{"lookat", PC(LookAt) PF_PLAYING },
		178	{"lock", PC(LockItem) PF_PLAYING },
		179	{"mark", PC(MarkItem) PF_PLAYING },
		180	{"move", PC(MoveCmd) PF_PLAYING },
		181	{"ext", PC(ExtCmd) 0 }, // CF+/Deliantra
		182	{"mapredraw", PC(MapRedrawCmd) 0 },
		183	{"mapinfo", PC(MapInfoCmd) 0 }, // CF+/Deliantra
131		184
132	/******************************************************************************	185	{"reply", SC(ReplyCmd) 0 },
133	*	186	{"exti", SC(ExtiCmd) 0 }, // CF+/Deliantra
134	* Start of read routines.	187	{"addme", SC(AddMeCmd) 0 },
135	*	188	{"askface", SC(AskFaceCmd) 0 },
136	******************************************************************************/	189	{"requestinfo", SC(RequestInfo) 0 },
		190	{"setsound", SC(SetSound) 0 },
		191	{"setup", SC(SetUp) 0 },
		192	{"version", SC(VersionCmd) 0 },
137		193
138	/**	194	{"toggleextendedtext", SC(NopCmd) 0 }, // deliantra: disabled
139	* This reads from fd and puts the data in sl. We return true if we think	195	};
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	*/
145
146	int SockList_ReadPacket(int fd, SockList *sl, int len)
147	{
148	int stat,toread;
149		196
150	/* Sanity check - shouldn't happen */	197	bool
151	if (sl->len < 0) {	198	client::may_execute (const packet_type *pkt) const
152	abort();	199	{
		200	return (!(pkt->flags & PF_PLAYER) \|\| pl)
		201	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
		202	}
		203
		204	// HACK: some commands currently should be executed
		205	// even when the player is frozen. this hack detects
		206	// those commands. it should be folded into may_execute,
		207	// but kept seperate to emphasise the hack aspect, i.e.
		208	// do it better, then remove.
		209	static bool
		210	always_immediate (const client ns, const packet_type pkt, const char *data, int len)
		211	{
		212	if (!(pkt->flags & PF_COMMAND))
		213	return false;
		214
		215	if (!ns->pl \|\| !ns->pl->ob \|\| !ns->pl->ob->map)
		216	return false;
		217
		218	if (len > 4 && data [ 3] == ' ' && !strncmp (data, "say " , 4)) return true;
		219	if (len > 5 && data [ 4] == ' ' && !strncmp (data, "chat " , 5)) return true;
		220	if (len > 6 && data [ 5] == ' ' && !strncmp (data, "shout " , 6)) return true;
		221	if (len > 8 && data [ 7] == ' ' && !strncmp (data, "suicide " , 8)) return true;
		222	if (len > 18 && data [17] == ' ' && !strncmp (data, "accept-invitation ", 18)) return true;
		223
		224	if (len == 7 && !strcmp (data, "suicide")) return true;
		225
		226	return false;
		227	}
		228
		229	void
		230	client::execute (const packet_type pkt, char data, int datalen)
		231	{
		232	if (may_execute (pkt) \|\| always_immediate (this, pkt, data, datalen))
153	}	233	{
154	/* We already have a partial packet */	234	//TODO: only one format
155	if (sl->len<2) {	235	if (pkt->flags & PF_PLAYER)
156	#ifdef WIN32 /* **WIN32 SockList_ReadPacket: change read() to recv() /
157
158	stat=recv(fd, sl->buf + sl->len, 2-sl->len,0);
159
160	#else
161	do {	236	{
162	stat=read(fd, sl->buf + sl->len, 2-sl->len);	237	((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
163	} while ((stat==-1) && (errno==EINTR));	238	pl->need_updated_stats ();
164	#endif	239	}
165	if (stat<0) {	240	else
166	/* In non blocking mode, EAGAIN is set when there is no	241	((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
167	* data available.	242	}
		243	else
		244	send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED \| NDI_REPLY, pkt->name);
		245	}
		246
		247	bool
		248	client::handle_packet ()
		249	{
		250	int pkt_len = next_packet ();
		251
		252	if (!pkt_len)
		253	return false;
		254	else if (pkt_len < 0)
		255	{
		256	LOG (llevError, "read error on player %s\n",
		257	pl && pl->ob ? &pl->ob->name : "[anonymous]");
		258	destroy ();
		259	return false;
		260	}
		261
		262	uint8_t save_byte = inbuf [pkt_len]; // rather ugly
		263	inbuf [pkt_len] = 0; /* temporarily terminate buffer - useful for string data */
		264
		265	/* First, break out beginning word. There are at least
		266	* a few commands that do not have any paremeters. If
		267	* we get such a command, don't worry about trying
		268	* to break it up.
		269	*/
		270	int datalen;
		271	char data = strchr ((char )inbuf + 2, ' ');
		272
		273	if (data)
		274	{
		275	*data++ = 0;
		276	datalen = pkt_len - (data - (char *)inbuf);
		277	}
		278	else
		279	{
		280	data = (char *)inbuf + 2; // better read garbage than segfault
		281	datalen = 0;
		282	}
		283
		284	for (packet_type *pkt = packets; pkt < packets + array_length (packets); ++pkt)
		285	if (!strcmp ((char *)inbuf + 2, pkt->name))
		286	{
		287	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
		288	queue_command (pkt, data, datalen);
		289	else
		290	execute (pkt, data, datalen);
		291
		292	goto next_packet;
		293	}
		294
		295	// If we get here, we didn't find a valid command.
		296	send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED \| NDI_REPLY, (char *)inbuf + 2);
		297
		298	next_packet:
		299	inbuf [pkt_len] = save_byte; // rather ugly
		300	skip_packet (pkt_len);
		301
		302	// input buffer has space again
		303	socket_ev.poll (socket_ev.poll () \| EV_READ);
		304
		305	return true;
		306	}
		307
		308	void
		309	client::inbuf_handle ()
		310	{
		311	if (!handle_packet ())
		312	return;
		313
		314	while (handle_packet ())
		315	;
		316
		317	flush ();
		318	}
		319
		320	// callback called when socket is either readable or writable
		321	void
		322	client::socket_cb (iow &w, int revents)
		323	{
		324	//TODO remove when we have better socket cleanup logic
		325	if (destroyed ())
		326	{
		327	socket_ev.poll (0);
		328	return;
		329	}
		330
		331	if (revents & EV_WRITE)
		332	{
		333	write_outputbuffer ();
		334
		335	if (!outputbuffer.len)
		336	socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
		337	}
		338
		339	if (revents & EV_READ)
		340	{
		341	int amount;
		342	uint8 *rbuf;
		343
		344	if (ws_version)
		345	{
		346	if (ws_inbuf_len + 2048 > ws_inbuf_alloc)
		347	ws_inbuf = (uint8 *)realloc (ws_inbuf, ws_inbuf_alloc += 4096);
		348
		349	rbuf = ws_inbuf + ws_inbuf_len;
		350	amount = ws_inbuf_alloc - ws_inbuf_len;
		351	}
		352	else
		353	{
		354	rbuf = inbuf + inbuf_len;
		355	amount = sizeof (inbuf) - inbuf_len;
		356	}
		357
		358	if (!amount)
		359	{
		360	// input buffer full
		361	LOG (llevError, "input buffer overflow.");
		362	destroy ();
		363	return;
		364	}
		365
		366	amount = read (fd, rbuf, amount);
		367
		368	if (!amount)
		369	{
		370	destroy ();
		371	return;
		372	}
		373	else if (amount < 0)
		374	{
		375	if (errno != EAGAIN && errno != EINTR)
168	*/	376	{
169	#ifdef WIN32 /* **WIN32 SockList_ReadPacket: error handling for win32 /	377	LOG (llevError, "read error: %s\n", strerror (errno));
170	if ((stat==-1) && WSAGetLastError() !=WSAEWOULDBLOCK) {	378	destroy ();
171	if(WSAGetLastError() == WSAECONNRESET)	379	return;
172	LOG(llevDebug,"Connection closed by client\n");	380	}
		381
		382	// should not be here, normally
		383	}
		384
		385	if (ws_version)
		386	{
		387	ws_inbuf_len += amount;
		388
		389	while (ws_inbuf_len)
		390	{
		391	if (ws_inbuf_len < 2 + 4) // 6 is minimum length: op, len, mask
173	else	392	break;
		393
		394	int d = 2;
		395	int fin = ws_inbuf [0] & 0x80;
		396	int op = ws_inbuf [0] & 0x0f;
		397	int len = ws_inbuf [1] & 0x7f;
		398
		399	if (len == 126)
174	{	400	{
175	LOG(llevDebug,"ReadPacket got error %d, returning 0\n",WSAGetLastError());	401	len = (ws_inbuf [2] << 8) \| ws_inbuf [3];
		402	d += 2;
176	}	403	}
177	return -1; /* kick this user! */	404	else if (len == 127)
		405	{
		406	if (ws_inbuf_len < 2 + 8)
		407	return;
		408
		409	// we don't do extra long frames, if a browser wants to send >2**32 bytes,
		410	// there are bigger issues to fix.
		411	len = (ws_inbuf [8] << 8) \| ws_inbuf [9];
		412	d += 8;
		413	}
		414
		415	// we only continue if we have a complete frame
		416	if (ws_inbuf_len < d + 4 + len)
		417	return;
		418
		419	switch (op)
		420	{
		421	case 0: op = ws_inbuf_type; break; // continuation
		422	case 1: ws_inbuf_type = 1; break; // utf-8
		423	case 2: ws_inbuf_type = 2; break; // binary
		424	}
		425
		426	if (len > sizeof (inbuf) - inbuf_len)
		427	{
		428	// input buffer full
		429	LOG (llevError, "input buffer overflow (ws).");
		430	destroy ();
		431	return;
		432	}
		433
		434	uint8 *buf = inbuf + inbuf_len + 2;
		435
		436	for (int i = 0; i < len; ++i)
		437	buf [i] = ws_inbuf [d + 4 + i] ^ ws_inbuf [d + (i & 3)];
		438
		439	// remove frame
		440	ws_inbuf_len -= d + 4 + len;
		441	memmove (ws_inbuf, ws_inbuf + d + 4 + len, ws_inbuf_len);
		442
		443	switch (op)
		444	{
		445	case 1: // utf-8
		446	// utf-8 encoded frames cannot have full length (MAXSOCKBUF) in all cases
		447	// but we assume that these extra-long packets will be rare.
		448	{
		449	uint8 *a = buf;
		450	uint8 *b = a;
		451	uint8 *c = a + len;
		452
		453	for (; a < c; ++a, ++b)
		454	{
		455	b = a;
		456
		457	if (*a >= 0x80)
		458	*b = (a [0] & 0x1f) << 6 \| (a [1] & 0x3f), ++a;
		459	}
		460
		461	len -= a - b;
		462	}
		463	/* FALLTHROUGH */
		464	case 2: // binary
		465	inbuf_len += len;
		466
		467	if (fin)
		468	{
		469	inbuf [0] = inbuf_len >> 8;
		470	inbuf [1] = inbuf_len;
		471
		472	inbuf_len += 2;
		473
		474	inbuf_handle ();
		475	}
		476	break;
		477
		478	case 9: // ping
		479	{
		480	// send pong - we assume ping messages are <64k
		481	// as we can't handle >10k at the moment anyway.
		482	uint8 hdr [] = { 0x8a, 126, len >> 8, len };
		483	send (hdr, sizeof (hdr));
		484	send (inbuf + inbuf_len, len);
		485	}
		486	break;
		487
		488	case 10: // pong
		489	break;
		490
		491	case 8: // close
		492	default:
		493	destroy ();
		494	return;
		495	}
178	}	496	}
179	#else
180	if (errno != EAGAIN && errno !=EWOULDBLOCK) {
181	LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno));
182	}	497	}
183	#endif	498	else
184	return 0; /Error /
185	}	499	{
186	if (stat==0) return -1;	500	inbuf_len += amount;
187	sl->len += stat;	501	inbuf_handle ();
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
211	/* return error so the socket is closed */
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	}	502	}
234	#else	503	}
235	if (errno != EAGAIN && errno !=EWOULDBLOCK) {
236	LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno));
237	}
238	#endif
239	return 0; /Error /
240	}
241	if (stat==0) return -1;
242	sl->len += stat;
243	#ifdef CS_LOGSTATS
244	cst_tot.ibytes += stat;
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	}	504	}
256		505
257	/*******************************************************************************	506	/*******************************************************************************
258	*	507	*
259	* Start of write related routines.	508	* Start of write related routines.
264	* Adds data to a socket buffer for whatever reason.	513	* Adds data to a socket buffer for whatever reason.
265	*	514	*
266	* ns is the socket we are adding the data to, buf is the start of the	515	* 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.	516	* data, and len is the number of bytes to add.
268	*/	517	*/
269		518	void
270	static void add_to_buffer(NewSocket ns, char buf, int len)	519	client::send (void *buf_, int len)
271	{	520	{
		521	char buf = (char )buf_;
		522
		523	if (destroyed () \|\| !buf)
		524	return;
		525
		526	if (len + outputbuffer.len > SOCKETBUFSIZE)
		527	{
		528	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
		529	// shutdown the socket, this is safer than destroying it immediately
		530	// as lots of code in the callchain might still access the map etc.
		531	shutdown (fd, SHUT_RDWR);
		532	return;
		533	}
		534
272	int avail, end;	535	int avail, end;
273		536
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	537	/* data + end is where we start putting the new data. The last byte
282	* currently in use is actually data + end -1	538	* currently in use is actually data + end -1
283	*/	539	*/
284
285	end=ns->outputbuffer.start + ns->outputbuffer.len;	540	end = outputbuffer.start + outputbuffer.len;
286	/* The buffer is already in a wrapped state, so adjust end */	541	/* The buffer is already in a wrapped state, so adjust end */
287	if (end>=SOCKETBUFSIZE) end-=SOCKETBUFSIZE;	542	if (end >= SOCKETBUFSIZE)
		543	end -= SOCKETBUFSIZE;
		544
288	avail=SOCKETBUFSIZE - end;	545	avail = SOCKETBUFSIZE - end;
289		546
290	/* We can all fit it behind the current data without wrapping */	547	/* We can all fit it behind the current data without wrapping */
291	if (avail >=len ) {	548	if (avail >= len)
292	memcpy(ns->outputbuffer.data + end, buf, len);	549	memcpy (outputbuffer.data + end, buf, len);
		550	else
293	}	551	{
294	else {
295	memcpy(ns->outputbuffer.data + end, buf, avail);	552	memcpy (outputbuffer.data + end, buf, avail);
296	memcpy(ns->outputbuffer.data, buf+avail, len-avail);	553	memcpy (outputbuffer.data, buf + avail, len - avail);
297	}	554	}
		555
298	ns->outputbuffer.len += len;	556	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	}	557	}
304
305	/**
306	* Writes data to socket.
307	*
308	* When the socket is clear to write, and we have backlogged data, this
309	* is called to write it out.
310	*/
311	void write_socket_buffer(NewSocket *ns)
312	{
313	int amt, max;
314
315	if (ns->outputbuffer.len==0) {
316	LOG(llevDebug,"write_socket_buffer called when there is no data, fd=%d\n",
317	ns->fd);
318	return;
319	}
320
321	do {
322	max = SOCKETBUFSIZE - ns->outputbuffer.start;
323	if (ns->outputbuffer.len<max) max = ns->outputbuffer.len;
324
325	#ifdef WIN32 /* **win32 write_socket_buffer: change write() to send() /
326	amt=send(ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max,0);
327	#else
328	do {
329	amt=write(ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
330	} while ((amt<0) && (errno==EINTR));
331	#endif
332
333	if (amt < 0) { /* We got an error */
334
335	#ifdef WIN32 /* **win32 write_socket_buffer: change error handling /
336	if (amt == -1 && WSAGetLastError() !=WSAEWOULDBLOCK) {
337	LOG(llevError,"New socket write failed (wsb) (%d).\n", WSAGetLastError());
338	#else
339	if (errno !=EWOULDBLOCK) {
340	LOG(llevError,"New socket write failed (wsb) (%d: %s).\n",
341	errno, strerror_local(errno));
342	#endif
343	ns->status=Ns_Dead;
344	return;
345	}
346	else { /* EWOULDBLOCK */
347	/* can't write it, so store it away. */
348	ns->can_write=0;
349	return;
350	}
351	}
352	ns->outputbuffer.start += amt;
353	/* wrap back to start of buffer */
354	if (ns->outputbuffer.start==SOCKETBUFSIZE) ns->outputbuffer.start=0;
355	ns->outputbuffer.len -= amt;
356	#ifdef CS_LOGSTATS
357	cst_tot.obytes += amt;
358	cst_lst.obytes += amt;
359	#endif
360	} while (ns->outputbuffer.len>0);
361	}
362
363	/**
364	* This writes data to the socket. - It is very low level -
365	* all we try and do is write out the data to the socket
366	* provided (ns). buf is the data to write, len is the number
367	* of bytes to write. IT doesn't return anything - rather, it
368	* updates the ns structure if we get an error.
369	*/
370	void Write_To_Socket(NewSocket ns, char buf, int len)
371	{
372	int amt=0;
373	char *pos=buf;
374
375	if (ns->status == Ns_Dead \|\| !buf) {
376	LOG(llevDebug,"Write_To_Socket called with dead socket\n");
377	return;
378	}
379
380	#ifndef __GNU__ /* This caused problems on Hurd */
381	if (!ns->can_write) {
382	add_to_buffer(ns, buf, len);
383	return;
384	}
385	#endif
386	/* If we manage to write more than we wanted, take it as a bonus */
387	while (len>0) {
388
389	#ifdef WIN32 /* **win32 Write_To_Socket: change write() to send() /
390	amt=send(ns->fd, pos, len,0);
391	#else
392	do {
393	amt=write(ns->fd, pos, len);
394	} while ((amt<0) && (errno==EINTR));
395	#endif
396
397	if (amt < 0) { /* We got an error */
398	#ifdef WIN32 /* **win32 Write_To_Socket: change error handling /
399	if (amt == -1 && WSAGetLastError() !=WSAEWOULDBLOCK) {
400	LOG(llevError,"New socket write failed WTS (%d).\n",WSAGetLastError());
401	#else
402	if (errno !=EWOULDBLOCK) {
403	LOG(llevError,"New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
404	errno, strerror_local(errno));
405	#endif
406	ns->status=Ns_Dead;
407	return;
408	}
409	else { /* EWOULDBLOCK */
410	/* can't write it, so store it away. */
411	add_to_buffer(ns, pos, len);
412	ns->can_write=0;
413	return;
414	}
415	}
416	/* amt gets set to 0 above in blocking code, so we do this as
417	* an else if to make sure we don't reprocess it.
418	*/
419	else if (amt==0) {
420	LOG(llevError,"Write_To_Socket: No data written out.\n");
421	}
422	len -= amt;
423	pos += amt;
424	#ifdef CS_LOGSTATS
425	cst_tot.obytes += amt;
426	cst_lst.obytes += amt;
427	#endif
428	}
429	}
430
431		558
432	/**	559	/**
433	* Takes a string of data, and writes it out to the socket. A very handy	560	* Takes a string of data, and writes it out to the socket. A very handy
434	* shortcut function.	561	* shortcut function.
435	*/	562	*/
436	void cs_write_string(NewSocket ns, const char buf, int len)	563	void
		564	client::send_packet (packet &sl)
437	{	565	{
438	SockList sl;	566	if (destroyed ())
439
440	sl.len = len;
441	sl.buf = (unsigned char*)buf;
442	Send_With_Handling(ns, &sl);
443	}
444
445
446	/**
447	* Calls Write_To_Socket to send data to the client.
448	*
449	* The only difference in this function is that we take a SockList
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;	567	return;
458		568
459	if (msg->len >= MAXSOCKBUF) {	569	if (sl.length () > MAXSOCKBUF)
		570	{
460	LOG(llevError,"Trying to send a buffer beyond properly size, len =%d\n",	571	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
461	msg->len);
462	/* Almost certainly we've overflowed a buffer, so quite now to make	572	/* Almost certainly we've overflowed a buffer, so quit now to make
463	* it easier to debug.	573	* it easier to debug.
464	*/	574	*/
465	abort();	575	abort ();
		576	}
		577
		578	if (!sl.length ())
		579	return;
		580
		581	if (ws_version == 8)
466	}	582	{
467	sbuf[0] = ((uint32)(msg->len) >> 8) & 0xFF;	583	static uint8 buf [MAXSOCKBUF * 2 + 4];
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		584
474	/**	585	uint8 *b = buf + 4;
475	* Takes a string of data, and writes it out to the socket. A very handy	586	for (uint8 *a = sl.buf_ + sl.hdrlen; a < sl.cur; ++a)
476	* shortcut function.	587	{
477	*/	588	if (*a < 0x80)
478	void Write_String_To_Socket(NewSocket ns, char buf, int len)	589	b++ = a;
479	{	590	else
480	SockList sl;	591	{
		592	b++ = 0xc0 \| ((a >> 6) & 0x1f);
		593	b++ = 0x80 \| ( a & 0x3f);
		594	}
		595	}
481		596
482	sl.len = len;	597	assert (b - buf < sizeof (buf));
483	sl.buf = (unsigned char*) buf;
484	Send_With_Handling(ns, &sl);
485	}
486		598
		599	int len = b - (buf + 4);
487		600
		601	if (len < 126)
		602	{
		603	buf [2] = 0x81;
		604	buf [3] = len;
		605
		606	send (buf + 2, len + 2);
		607	}
		608	else
		609	{
		610	buf [0] = 0x81;
		611	buf [1] = 126;
		612	buf [2] = len >> 8;
		613	buf [3] = len;
		614
		615	send (buf, len + 4);
		616	}
		617	}
		618	else if (ws_version == 13)
		619	{
		620	int len = sl.length ();
		621
		622	if (len < 126)
		623	{
		624	uint8 hdr [] = { 0x82, len };
		625	send (hdr, sizeof (hdr));
		626	}
		627	else
		628	{
		629	uint8 hdr [] = { 0x82, 126, len >> 8, len };
		630	send (hdr, sizeof (hdr));
		631	}
		632
		633	send (sl.buf_ + sl.hdrlen, len);
		634	}
		635	else
		636	{
		637	assert (sl.hdrlen == 2);
		638
		639	sl.buf_ [0] = sl.length () >> 8;
		640	sl.buf_ [1] = sl.length () ;
		641
		642	send (sl.buf_, sl.length () + sl.hdrlen);
		643	}
		644	}
		645
		646	void
		647	client::send_packet (const char *buf, int len)
		648	{
		649	packet sl;
		650
		651	sl << data (buf, len);
		652	send_packet (sl);
		653	}
		654
		655	void
		656	client::send_packet (const char *buf)
		657	{
		658	send_packet (buf, strlen (buf));
		659	}
		660
		661	void
		662	client::send_packet_printf (const char *format, ...)
		663	{
		664	packet sl;
		665
		666	va_list ap;
		667	va_start (ap, format);
		668	sl.vprintf (format, ap);
		669	va_end (ap);
		670
		671	send_packet (sl);
		672	}
		673
		674	void
		675	client::send_msg (int color, const char type, const char msg)
		676	{
		677	if (!msg \|\| !type) // it can happen (for example, missing attack messages cause this)
		678	{
		679	LOG (logBacktrace \| llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
		680	return;
		681	}
		682
		683	int len = strlen (msg);
		684
		685	if (!(color & NDI_VERBATIM)
		686	&& (msg_is_special (msg)
		687	\|\| (type [0] == 'c' && type [1] == '/') \|\| len > (MAXSOCKBUF - 128)))
		688	cfperl_send_msg (this, color, type, msg);
		689	else
		690	send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
		691	}
		692
		693	void
		694	client::send_drawinfo (const char *msg, int flags)
		695	{
		696	send_msg (flags, "log", msg);
		697	}
		698
488	/******************************************************************************	699	/***********************************************************************
489	*	700	*
490	* statistics logging functions.	701	* packet functions/utilities
491	*	702	*
492	******************************************************************************/	703	**********************************************************************/
493		704
494	#ifdef CS_LOGSTATS	705	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	{	706	{
505	time_t now=time(NULL);	707	reset ();
506		708
507	/* If no connections recently, don't both to log anything */	709	int len = strlen (name);
508	if (cst_lst.ibytes==0 && cst_lst.obytes==0) return;	710	memcpy (cur, name, len); cur += len;
509		711	*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	}	712	}
520	#endif	713
		714	packet &packet::operator <<(const ber32 v)
		715	{
		716	enum { maxlen = 32 / 7 + 1 };
		717	uint8 buf[maxlen];
		718	uint8 *p = buf + maxlen;
		719	uint32 val = v.val;
		720
		721	*--p = val & 0x7F;
		722
		723	while (val > 0x7F)
		724	{
		725	val >>= 7;
		726	*--p = (val & 0x7F) \| 0x80;
		727	}
		728
		729	return *this << data (p, buf + maxlen - p);
		730	}
		731
		732	packet &packet::operator <<(const data &v)
		733	{
		734	if (room () < v.len)
		735	reset ();
		736	else
		737	{
		738	if (v.len)
		739	{
		740	memcpy (cur, v.ptr, v.len);
		741	cur += v.len;
		742	}
		743	}
		744
		745	return *this;
		746	}
		747
		748	packet &packet::operator <<(const data8 &v)
		749	{
		750	unsigned int len = min (v.len, 0x00FF);
		751	return *this << uint8 (len) << data (v.ptr, len);
		752	}
		753
		754	packet &packet::operator <<(const data16 &v)
		755	{
		756	unsigned int len = min (v.len, 0xFFFF);
		757	return *this << uint16 (len) << data (v.ptr, len);
		758	}
		759
		760	packet &packet::operator <<(const char *v)
		761	{
		762	return *this << data (v, strlen (v ? v : 0));
		763	}
		764
		765	void
		766	packet::vprintf (const char *format, va_list ap)
		767	{
		768	int size = room ();
		769
		770	int len = vsnprintf ((char *)cur, size, format, ap);
		771
		772	if (len >= size)
		773	return reset ();
		774
		775	cur += len;
		776	}
		777

Diff Legend

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

Comparing deliantra/server/socket/lowlevel.C (file contents): Revision 1.3 by root, Tue Aug 29 08:01:38 2006 UTC vs. Revision 1.93 by root, Sat Nov 17 06:05:34 2012 UTC

Diff Legend

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.3 by root, Tue Aug 29 08:01:38 2006 UTC vs.
Revision 1.93 by root, Sat Nov 17 06:05:34 2012 UTC