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

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.1 by elmex, Sun Aug 13 17:16:06 2006 UTC vs.
Revision 1.78 by root, Fri Apr 30 20:43:18 2010 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 1.1 2006/08/13 17:16:06 elmex Exp $";	3	*
		4	* Copyright (©) 2005,2006,2007,2008,2009,2010 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_NOP 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 map1/map1a seem to be the only
		59	// nop'able commands and they are quite small.
		60	packet sl (mapmode == Map1Cmd ? "map1" : "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 ("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
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_AddChar(SockList *sl, char c)	162	static void
		163	NopCmd (char , int, client )
100	{	164	{
101	sl->buf[sl->len]=c;	165	// do nothing
102	sl->len++;
103	}	166	}
104		167
105	void SockList_AddShort(SockList *sl, uint16 data)	168	/**
106	{	169	* Dispatch table for the server.
107	sl->buf[sl->len++]= (data>>8)&0xff;
108	sl->buf[sl->len++] = data & 0xff;
109	}
110
111
112	void SockList_AddInt(SockList *sl, uint32 data)
113	{
114	sl->buf[sl->len++]= (data>>24)&0xff;
115	sl->buf[sl->len++]= (data>>16)&0xff;
116	sl->buf[sl->len++]= (data>>8)&0xff;
117	sl->buf[sl->len++] = data & 0xff;
118	}
119
120	void SockList_AddInt64(SockList *sl, uint64 data)
121	{
122	sl->buf[sl->len++]= ( char )( (data>>56)&0xff );
123	sl->buf[sl->len++]= ( char )( (data>>48)&0xff );
124	sl->buf[sl->len++]= ( char )( (data>>40)&0xff );
125	sl->buf[sl->len++]= ( char )( (data>>32)&0xff );
126
127	sl->buf[sl->len++]= ( char )( (data>>24)&0xff );
128	sl->buf[sl->len++]= ( char )( (data>>16)&0xff );
129	sl->buf[sl->len++]= ( char )( (data>>8)&0xff );
130	sl->buf[sl->len++] =( char )( data & 0xff );
131	}
132
133	/* Basically does the reverse of SockList_AddInt, but on
134	* strings instead. Same for the GetShort, but for 16 bits.
135	*/	170	*/
136	int GetInt_String(unsigned char *data)	171	static struct packet_type packets[] = {
137	{	172	{"ncom", PC(NewPlayerCmd) PF_PLAYING \| PF_COMMAND6 },
138	return ((data[0]<<24) + (data[1]<<16) + (data[2]<<8) + data[3]);	173	{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND0 },
139	}
140		174
141	short GetShort_String(unsigned char *data) {	175	{"examine", PC(ExamineCmd) PF_PLAYING },
142	return ((data[0]<<8)+data[1]);	176	{"ex", PC(ExCmd) PF_PLAYING },
143	}	177	{"apply", PC(ApplyCmd) PF_PLAYING },
		178	{"lookat", PC(LookAt) PF_PLAYING },
		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
144		185
145	/******************************************************************************	186	{"reply", SC(ReplyCmd) 0 },
146	*	187	{"exti", SC(ExtiCmd) 0 }, // CF+/Deliantra
147	* Start of read routines.	188	{"addme", SC(AddMeCmd) 0 },
148	*	189	{"askface", SC(AskFaceCmd) 0 },
149	******************************************************************************/	190	{"requestinfo", SC(RequestInfo) 0 },
		191	{"setsound", SC(SetSound) 0 },
		192	{"setup", SC(SetUp) 0 },
		193	{"version", SC(VersionCmd) 0 },
150		194
151	/**	195	{"toggleextendedtext", SC(NopCmd) 0 }, // deliantra: disabled
152	* This reads from fd and puts the data in sl. We return true if we think	196	};
153	* we have a full packet, 0 if we have a partial packet. The only processing
154	* we do is remove the intial size value. len (As passed) is the size of the
155	* buffer allocated in the socklist. We make the assumption the buffer is
156	* at least 2 bytes long.
157	*/
158
159	int SockList_ReadPacket(int fd, SockList *sl, int len)
160	{
161	int stat,toread;
162		197
163	/* Sanity check - shouldn't happen */	198	bool
164	if (sl->len < 0) {	199	client::may_execute (const packet_type *pkt) const
165	abort();	200	{
		201	return (!(pkt->flags & PF_PLAYER) \|\| pl)
		202	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
		203	}
		204
		205	// HACK: some commands currently should be executed
		206	// even when the player is frozen. this hack detects
		207	// those commands. it should be folded into may_execute,
		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)
166	}	220	{
167	/* We already have a partial packet */	221	data += 6;
168	if (sl->len<2) {	222	len -= 6;
169	#ifdef WIN32 /* **WIN32 SockList_ReadPacket: change read() to recv() /
170
171	stat=recv(fd, sl->buf + sl->len, 2-sl->len,0);
172
173	#else
174	do {
175	stat=read(fd, sl->buf + sl->len, 2-sl->len);
176	} while ((stat==-1) && (errno==EINTR));
177	#endif
178	if (stat<0) {
179	/* In non blocking mode, EAGAIN is set when there is no
180	* data available.
181	*/
182	#ifdef WIN32 /* **WIN32 SockList_ReadPacket: error handling for win32 /
183	if ((stat==-1) && WSAGetLastError() !=WSAEWOULDBLOCK) {
184	if(WSAGetLastError() == WSAECONNRESET)
185	LOG(llevDebug,"Connection closed by client\n");
186	else
187	{
188	LOG(llevDebug,"ReadPacket got error %d, returning 0\n",WSAGetLastError());
189	}
190	return -1; /* kick this user! */
191	}	223	}
192	#else	224
193	if (errno != EAGAIN && errno !=EWOULDBLOCK) {	225	if (len > 4 && data [ 3] == ' ' && !strncmp (data, "say " , 4)) return true;
194	LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno));	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)
		243	{
		244	((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
		245	pl->need_updated_stats ();
		246	}
		247	else
		248	((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
195	}	249	}
196	#endif	250	else
197	return 0; /Error /	251	send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED \| NDI_REPLY, pkt->name);
198	}	252	}
199	if (stat==0) return -1;	253
200	sl->len += stat;	254	bool
201	#ifdef CS_LOGSTATS	255	client::handle_packet ()
202	cst_tot.ibytes += stat;	256	{
203	cst_lst.ibytes += stat;	257	int pkt_len = next_packet ();
204	#endif	258
205	if (stat<2) return 0; /* Still don't have a full packet */	259	if (!pkt_len)
		260	return false;
		261	else if (pkt_len < 0)
206	}	262	{
207	/* Figure out how much more data we need to read. Add 2 from the	263	LOG (llevError, "read error on player %s\n",
208	* end of this - size header information is not included.	264	pl && pl->ob ? &pl->ob->name : "[anonymous]");
209	*/	265	destroy ();
210	toread = 2+(sl->buf[0] << 8) + sl->buf[1] - sl->len;	266	return false;
211	if ((toread + sl->len) >= len) {
212	LOG(llevError,"SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n",
213	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
224	/* return error so the socket is closed */
225	return -1;
226	}
227	do {
228	#ifdef WIN32 /* **win32 SockList_ReadPacket: change read() to recv() /
229	stat = recv(fd, sl->buf+ sl->len, toread, 0);
230	#else
231	do {
232	stat = read(fd, sl->buf+ sl->len, toread);
233	} while ((stat<0) && (errno==EINTR));
234	#endif
235	if (stat<0) {
236
237	#ifdef WIN32 /* **win32 SockList_ReadPacket: change error handling for win32 /
238	if ((stat==-1) && WSAGetLastError() !=WSAEWOULDBLOCK) {
239	if(WSAGetLastError() == WSAECONNRESET)
240	LOG(llevDebug,"Connection closed by client\n");
241	else
242	{
243	LOG(llevDebug,"ReadPacket got error %d, returning 0\n",WSAGetLastError());
244	}
245	return -1; /* kick this user! */
246	}	267	}
247	#else	268
248	if (errno != EAGAIN && errno !=EWOULDBLOCK) {	269	uint8_t save_byte = inbuf [pkt_len]; // rather ugly
249	LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno));	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);
250	}	284	}
251	#endif	285	else
252	return 0; /Error /	286	{
253	}	287	data = (char *)inbuf + 2; // better read garbage than segfault
254	if (stat==0) return -1;	288	datalen = 0;
255	sl->len += stat;	289	}
256	#ifdef CS_LOGSTATS	290
257	cst_tot.ibytes += stat;	291	for (packet_type *pkt = packets; pkt < packets + array_length (packets); ++pkt)
258	cst_lst.ibytes += stat;	292	if (!strcmp ((char *)inbuf + 2, pkt->name))
259	#endif	293	{
260	toread -= stat;	294	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
261	if (toread==0) return 1;	295	queue_command (pkt, data, datalen);
262	if (toread < 0) {	296	else
263	LOG(llevError,"SockList_ReadPacket: Read more bytes than desired.\n");	297	execute (pkt, data, datalen);
264	return 1;	298
265	}	299	goto next_packet;
266	} while (toread>0);	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	// callback called when socket is either readable or writable
		316	void
		317	client::socket_cb (iow &w, int revents)
		318	{
		319	//TODO remove when we have better socket cleanup logic
		320	if (destroyed ())
		321	{
		322	socket_ev.poll (0);
267	return 0;	323	return;
		324	}
		325
		326	if (revents & EV_WRITE)
		327	{
		328	write_outputbuffer ();
		329
		330	if (!outputbuffer.len)
		331	socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
		332	}
		333
		334	if (revents & EV_READ)
		335	{
		336	//TODO: rate-limit tcp connection in better ways, important
		337
		338	int amount = sizeof (inbuf) - inbuf_len;
		339
		340	if (!amount)
		341	{
		342	// input buffer full
		343	socket_ev.poll (socket_ev.poll () & ~EV_READ);
		344	return;
		345	}
		346
		347	amount = read (fd, inbuf + inbuf_len, amount);
		348
		349	if (!amount)
		350	{
		351	destroy ();
		352	return;
		353	}
		354	else if (amount < 0)
		355	{
		356	if (errno != EAGAIN && errno != EINTR)
		357	{
		358	LOG (llevError, "read error: %s\n", strerror (errno));
		359	destroy ();
		360	return;
		361	}
		362
		363	// should not be here, normally
		364	}
		365	else
		366	{
		367	inbuf_len += amount;
		368
		369	if (handle_packet ())
		370	{
		371	while (handle_packet ())
		372	;
		373
		374	flush ();
		375	}
		376	}
		377	}
268	}	378	}
269		379
270	/*******************************************************************************	380	/*******************************************************************************
271	*	381	*
272	* Start of write related routines.	382	* Start of write related routines.
277	* Adds data to a socket buffer for whatever reason.	387	* Adds data to a socket buffer for whatever reason.
278	*	388	*
279	* ns is the socket we are adding the data to, buf is the start of the	389	* ns is the socket we are adding the data to, buf is the start of the
280	* data, and len is the number of bytes to add.	390	* data, and len is the number of bytes to add.
281	*/	391	*/
282		392	void
283	static void add_to_buffer(NewSocket ns, char buf, int len)	393	client::send (void *buf_, int len)
284	{	394	{
		395	char buf = (char )buf_;
		396
		397	if (destroyed () \|\| !buf)
		398	return;
		399
		400	if (len + outputbuffer.len > SOCKETBUFSIZE)
		401	{
		402	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
		403	// shutdown the socket, this is safer than destroying it immediately
		404	// as lots of code in the callchain might still access the map etc.
		405	shutdown (fd, SHUT_RDWR);
		406	return;
		407	}
		408
285	int avail, end;	409	int avail, end;
286		410
287	if ((len+ns->outputbuffer.len)>SOCKETBUFSIZE) {
288	LOG(llevDebug,"Socket on fd %d has overrun internal buffer - marking as dead\n",
289	ns->fd);
290	ns->status = Ns_Dead;
291	return;
292	}
293
294	/* data + end is where we start putting the new data. The last byte	411	/* data + end is where we start putting the new data. The last byte
295	* currently in use is actually data + end -1	412	* currently in use is actually data + end -1
296	*/	413	*/
297
298	end=ns->outputbuffer.start + ns->outputbuffer.len;	414	end = outputbuffer.start + outputbuffer.len;
299	/* The buffer is already in a wrapped state, so adjust end */	415	/* The buffer is already in a wrapped state, so adjust end */
300	if (end>=SOCKETBUFSIZE) end-=SOCKETBUFSIZE;	416	if (end >= SOCKETBUFSIZE)
		417	end -= SOCKETBUFSIZE;
		418
301	avail=SOCKETBUFSIZE - end;	419	avail = SOCKETBUFSIZE - end;
302		420
303	/* We can all fit it behind the current data without wrapping */	421	/* We can all fit it behind the current data without wrapping */
304	if (avail >=len ) {	422	if (avail >= len)
305	memcpy(ns->outputbuffer.data + end, buf, len);	423	memcpy (outputbuffer.data + end, buf, len);
		424	else
306	}	425	{
307	else {
308	memcpy(ns->outputbuffer.data + end, buf, avail);	426	memcpy (outputbuffer.data + end, buf, avail);
309	memcpy(ns->outputbuffer.data, buf+avail, len-avail);	427	memcpy (outputbuffer.data, buf + avail, len - avail);
310	}
311	ns->outputbuffer.len += len;
312	#if 0
313	LOG(llevDebug,"Added %d to output buffer, total length now %d, start=%d\n", len,
314	ns->outputbuffer.len, ns->outputbuffer.start);
315	#endif
316	}
317
318	/**
319	* Writes data to socket.
320	*
321	* When the socket is clear to write, and we have backlogged data, this
322	* is called to write it out.
323	*/
324	void write_socket_buffer(NewSocket *ns)
325	{
326	int amt, max;
327
328	if (ns->outputbuffer.len==0) {
329	LOG(llevDebug,"write_socket_buffer called when there is no data, fd=%d\n",
330	ns->fd);
331	return;
332	}
333
334	do {
335	max = SOCKETBUFSIZE - ns->outputbuffer.start;
336	if (ns->outputbuffer.len<max) max = ns->outputbuffer.len;
337
338	#ifdef WIN32 /* **win32 write_socket_buffer: change write() to send() /
339	amt=send(ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max,0);
340	#else
341	do {
342	amt=write(ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
343	} while ((amt<0) && (errno==EINTR));
344	#endif
345
346	if (amt < 0) { /* We got an error */
347
348	#ifdef WIN32 /* **win32 write_socket_buffer: change error handling /
349	if (amt == -1 && WSAGetLastError() !=WSAEWOULDBLOCK) {
350	LOG(llevError,"New socket write failed (wsb) (%d).\n", WSAGetLastError());
351	#else
352	if (errno !=EWOULDBLOCK) {
353	LOG(llevError,"New socket write failed (wsb) (%d: %s).\n",
354	errno, strerror_local(errno));
355	#endif
356	ns->status=Ns_Dead;
357	return;
358	}	428	}
359	else { /* EWOULDBLOCK */
360	/* can't write it, so store it away. */
361	ns->can_write=0;
362	return;
363	}
364	}
365	ns->outputbuffer.start += amt;
366	/* wrap back to start of buffer */
367	if (ns->outputbuffer.start==SOCKETBUFSIZE) ns->outputbuffer.start=0;
368	ns->outputbuffer.len -= amt;
369	#ifdef CS_LOGSTATS
370	cst_tot.obytes += amt;
371	cst_lst.obytes += amt;
372	#endif
373	} while (ns->outputbuffer.len>0);
374	}
375		429
376	/**	430	outputbuffer.len += len;
377	* This writes data to the socket. - It is very low level -
378	* all we try and do is write out the data to the socket
379	* provided (ns). buf is the data to write, len is the number
380	* of bytes to write. IT doesn't return anything - rather, it
381	* updates the ns structure if we get an error.
382	*/
383	void Write_To_Socket(NewSocket ns, char buf, int len)
384	{
385	int amt=0;
386	char *pos=buf;
387
388	if (ns->status == Ns_Dead \|\| !buf) {
389	LOG(llevDebug,"Write_To_Socket called with dead socket\n");
390	return;
391	}
392
393	#ifndef __GNU__ /* This caused problems on Hurd */
394	if (!ns->can_write) {
395	add_to_buffer(ns, buf, len);
396	return;
397	}
398	#endif
399	/* If we manage to write more than we wanted, take it as a bonus */
400	while (len>0) {
401
402	#ifdef WIN32 /* **win32 Write_To_Socket: change write() to send() /
403	amt=send(ns->fd, pos, len,0);
404	#else
405	do {
406	amt=write(ns->fd, pos, len);
407	} while ((amt<0) && (errno==EINTR));
408	#endif
409
410	if (amt < 0) { /* We got an error */
411	#ifdef WIN32 /* **win32 Write_To_Socket: change error handling /
412	if (amt == -1 && WSAGetLastError() !=WSAEWOULDBLOCK) {
413	LOG(llevError,"New socket write failed WTS (%d).\n",WSAGetLastError());
414	#else
415	if (errno !=EWOULDBLOCK) {
416	LOG(llevError,"New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
417	errno, strerror_local(errno));
418	#endif
419	ns->status=Ns_Dead;
420	return;
421	}
422	else { /* EWOULDBLOCK */
423	/* can't write it, so store it away. */
424	add_to_buffer(ns, pos, len);
425	ns->can_write=0;
426	return;
427	}
428	}
429	/* amt gets set to 0 above in blocking code, so we do this as
430	* an else if to make sure we don't reprocess it.
431	*/
432	else if (amt==0) {
433	LOG(llevError,"Write_To_Socket: No data written out.\n");
434	}
435	len -= amt;
436	pos += amt;
437	#ifdef CS_LOGSTATS
438	cst_tot.obytes += amt;
439	cst_lst.obytes += amt;
440	#endif
441	}
442	}	431	}
443
444		432
445	/**	433	/**
446	* Takes a string of data, and writes it out to the socket. A very handy	434	* Takes a string of data, and writes it out to the socket. A very handy
447	* shortcut function.	435	* shortcut function.
448	*/	436	*/
449	void cs_write_string(NewSocket ns, const char buf, int len)	437	void
		438	client::send_packet (packet &sl)
450	{	439	{
451	SockList sl;	440	if (destroyed ())
		441	return;
452		442
453	sl.len = len;	443	if (sl.length () > MAXSOCKBUF)
454	sl.buf = (unsigned char*)buf;	444	{
455	Send_With_Handling(ns, &sl);
456	}
457
458
459	/**
460	* Calls Write_To_Socket to send data to the client.
461	*
462	* The only difference in this function is that we take a SockList
463	*, and we prepend the length information.
464	*/
465	void Send_With_Handling(NewSocket ns,SockList msg)
466	{
467	unsigned char sbuf[4];
468
469	if (ns->status == Ns_Dead \|\| !msg)
470	return;
471
472	if (msg->len >= MAXSOCKBUF) {
473	LOG(llevError,"Trying to send a buffer beyond properly size, len =%d\n",	445	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
474	msg->len);
475	/* Almost certainly we've overflowed a buffer, so quite now to make	446	/* Almost certainly we've overflowed a buffer, so quit now to make
476	* it easier to debug.	447	* it easier to debug.
477	*/	448	*/
478	abort();	449	abort ();
		450	}
		451
		452	if (!sl.length ())
		453	return;
		454
		455	assert (sl.hdrlen == 2);
		456
		457	sl.buf_ [0] = sl.length () >> 8;
		458	sl.buf_ [1] = sl.length () ;
		459
		460	send (sl.buf_, sl.length () + sl.hdrlen);
		461	}
		462
		463	void
		464	client::send_packet (const char *buf, int len)
		465	{
		466	packet sl;
		467
		468	sl << data (buf, len);
		469	send_packet (sl);
		470	}
		471
		472	void
		473	client::send_packet (const char *buf)
		474	{
		475	send_packet (buf, strlen (buf));
		476	}
		477
		478	void
		479	client::send_packet_printf (const char *format, ...)
		480	{
		481	packet sl;
		482
		483	va_list ap;
		484	va_start (ap, format);
		485	sl.vprintf (format, ap);
		486	va_end (ap);
		487
		488	send_packet (sl);
		489	}
		490
		491	void
		492	client::send_msg (int color, const char type, const char msg)
		493	{
		494	if (!msg \|\| !type) // it can happen (for example, missing attack messages cause this)
479	}	495	{
480	sbuf[0] = ((uint32)(msg->len) >> 8) & 0xFF;	496	LOG (logBacktrace \| llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
481	sbuf[1] = ((uint32)(msg->len)) & 0xFF;	497	return;
482	if (ns->status != Ns_Old)	498	}
483	Write_To_Socket(ns, (char *) sbuf, 2);
484	Write_To_Socket(ns, (char*)msg->buf, msg->len);
485	}
486		499
487	/**	500	int len = strlen (msg);
488	* Takes a string of data, and writes it out to the socket. A very handy
489	* shortcut function.
490	*/
491	void Write_String_To_Socket(NewSocket ns, char buf, int len)
492	{
493	SockList sl;
494		501
495	sl.len = len;	502	if (!(color & NDI_VERBATIM)
496	sl.buf = (unsigned char*) buf;	503	&& (msg_is_special (msg)
497	Send_With_Handling(ns, &sl);	504	\|\| (type [0] == 'c' && type [1] == '/') \|\| len > (MAXSOCKBUF - 128)))
		505	cfperl_send_msg (this, color, type, msg);
		506	else
		507	send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
498	}	508	}
499		509
		510	void
		511	client::send_drawinfo (const char *msg, int flags)
		512	{
		513	send_msg (flags, "log", msg);
		514	}
500		515
501	/******************************************************************************	516	/***********************************************************************
502	*	517	*
503	* statistics logging functions.	518	* packet functions/utilities
504	*	519	*
505	******************************************************************************/	520	**********************************************************************/
506		521
507	#ifdef CS_LOGSTATS	522	packet::packet (const char *name)
508	/* cst_tot is for the life of the server, cst_last is for the last series of
509	* stats
510	*/
511	CS_Stats cst_tot, cst_lst;
512
513	/**
514	* Writes out the gathered stats. We clear cst_lst.
515	*/
516	void write_cs_stats(void)
517	{	523	{
518	time_t now=time(NULL);	524	reset ();
519		525
520	/* If no connections recently, don't both to log anything */	526	int len = strlen (name);
521	if (cst_lst.ibytes==0 && cst_lst.obytes==0) return;	527	memcpy (cur, name, len); cur += len;
522		528	*cur++ = ' ';
523	/* CSSTAT is put in so scripts can easily find the line */
524	LOG(llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
525	ctime(&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
526	now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes,
527	cst_lst.max_conn, now - cst_lst.time_start);
528	cst_lst.ibytes=0;
529	cst_lst.obytes=0;
530	cst_lst.max_conn=socket_info.nconns;
531	cst_lst.time_start=now;
532	}	529	}
533	#endif	530
		531	packet &packet::operator <<(const ber32 v)
		532	{
		533	enum { maxlen = 32 / 7 + 1};
		534	uint8 buf[maxlen];
		535	uint8 *p = buf + maxlen;
		536	uint32 val = v.val;
		537
		538	*--p = val & 0x7F;
		539
		540	while (val > 0x7F)
		541	{
		542	val >>= 7;
		543	*--p = (val & 0x7F) \| 0x80;
		544	}
		545
		546	return *this << data (p, buf + maxlen - p);
		547	}
		548
		549	packet &packet::operator <<(const data &v)
		550	{
		551	if (room () < v.len)
		552	reset ();
		553	else
		554	{
		555	if (v.len)
		556	{
		557	memcpy (cur, v.ptr, v.len);
		558	cur += v.len;
		559	}
		560	}
		561
		562	return *this;
		563	}
		564
		565	packet &packet::operator <<(const data8 &v)
		566	{
		567	unsigned int len = min (v.len, 0x00FF);
		568	return *this << uint8 (len) << data (v.ptr, len);
		569	}
		570
		571	packet &packet::operator <<(const data16 &v)
		572	{
		573	unsigned int len = min (v.len, 0xFFFF);
		574	return *this << uint16 (len) << data (v.ptr, len);
		575	}
		576
		577	packet &packet::operator <<(const char *v)
		578	{
		579	return *this << data (v, strlen (v ? v : 0));
		580	}
		581
		582	void
		583	packet::vprintf (const char *format, va_list ap)
		584	{
		585	int size = room ();
		586
		587	int len = vsnprintf ((char *)cur, size, format, ap);
		588
		589	if (len >= size)
		590	return reset ();
		591
		592	cur += len;
		593	}
		594

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Comparing deliantra/server/socket/lowlevel.C (file contents): Revision 1.1 by elmex, Sun Aug 13 17:16:06 2006 UTC vs. Revision 1.78 by root, Fri Apr 30 20:43:18 2010 UTC

Diff Legend

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.1 by elmex, Sun Aug 13 17:16:06 2006 UTC vs.
Revision 1.78 by root, Fri Apr 30 20:43:18 2010 UTC