[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 1.34 by pippijn, Thu Mar 1 12:28:17 2007 UTC

…		…
1
2	/*	1	/*
3	* static char *rcsid_sockets_c =	2	* CrossFire, A Multiplayer game for X-windows
4	* "$Id: lowlevel.C,v 1.1 2006/08/13 17:16:06 elmex Exp $";	3	*
		4	* Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team
		5	* Copyright (C) 1992 Frank Tore Johansen
		6	*
		7	* This program is free software; you can redistribute it and/or modify
		8	* it under the terms of the GNU General Public License as published by
		9	* the Free Software Foundation; either version 2 of the License, or
		10	* (at your option) any later version.
		11	*
		12	* This program is distributed in the hope that it will be useful,
		13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
		14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		15	* GNU General Public License for more details.
		16	*
		17	* You should have received a copy of the GNU General Public License
		18	* along with this program; if not, write to the Free Software
		19	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
		20	*
		21	* The author can be reached via e-mail to mark@pyramid.com
5	*/	22	*/
6		23
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	/**	24	/**
30	* \file	25	* \file
31	* Low-level socket-related functions.	26	* Low-level socket-related functions.
32	*	27	*
33	* \date 2003-12-02	28	* \date 2003-12-02
39	*/	34	*/
40		35
41	using namespace std;	36	using namespace std;
42		37
43	#include <global.h>	38	#include <global.h>
44	#include <newclient.h>
45	#include <sproto.h>	39	#include <sproto.h>
		40	#include <cstdarg>
46		41
47	#ifdef __linux__	42	#ifdef __linux__
48	# include <sys/types.h>	43	# include <sys/types.h>
49	# include <sys/socket.h>	44	# include <sys/socket.h>
50	# include <netinet/in.h>	45	# include <netinet/in.h>
51	# define TCP_HZ 1000 // sorry...
52	# include <netinet/tcp.h>	46	# include <netinet/tcp.h>
53	#endif	47	#endif
54		48
55	// use a really low timeout, as it doesn't cost any bandwidth, and you can	49	// use a really low timeout, as it doesn't cost any bandwidth, and you can
56	// easily die in 20 seconds...	50	// easily die in 20 seconds...
57	#define SOCKET_TIMEOUT1 10	51	#define SOCKET_TIMEOUT1 10 * 1000
58	#define SOCKET_TIMEOUT2 20	52	#define SOCKET_TIMEOUT2 20 * 1000
59		53
60	void Socket_Flush (NewSocket *ns)	54	void
		55	client::flush ()
61	{	56	{
		57	if (destroyed ())
		58	return;
		59
62	#ifdef __linux__	60	#ifdef __linux__
63	// check time of last ack, and, if too old, kill connection	61	// check time of last ack, and, if too old, kill connection
64	struct tcp_info tcpi;	62	struct tcp_info tcpi;
65	socklen_t len = sizeof (tcpi);	63	socklen_t len = sizeof (tcpi);
66		64
67	if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))	65	if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
68	{	66	{
69	unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;	67	unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
70		68
71	if (tcpi.tcpi_unacked	69	rtt = tcpi.tcpi_rtt;
		70	rttvar = tcpi.tcpi_rttvar;
		71
72	&& SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s	72	if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s
73	&& SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s	73	&& SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s
74	{	74	{
75	LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd,	75	LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
76	(unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);	76	(unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
77	ns->status = Ns_Dead;	77	destroy ();
78	}	78	}
79	}	79	}
80
81	int val;
82	val = 0; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
83	val = 1; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
84	#endif	80	#endif
85	}
86		81
		82	/**
		83	* Writes data to socket.
		84	*
		85	* When the socket is clear to write, and we have backlogged data, this
		86	* is called to write it out.
		87	*/
		88
		89	if (!outputbuffer.len \|\| socket_ev.poll () & PE_W)
		90	return;
		91
		92	write_outputbuffer ();
		93	}
		94
		95	void
		96	client::write_outputbuffer ()
		97	{
		98	while (outputbuffer.len)
		99	{
		100	int res = write (fd, outputbuffer.data + outputbuffer.start,
		101	min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
		102
		103	if (res > 0)
		104	{
		105	outputbuffer.start += res;
		106	/* wrap back to start of buffer */
		107	if (outputbuffer.start == SOCKETBUFSIZE)
		108	outputbuffer.start = 0;
		109
		110	outputbuffer.len -= res;
		111	#ifdef CS_LOGSTATS
		112	cst_tot.obytes += res;
		113	cst_lst.obytes += res;
		114	#endif
		115	}
		116	else if (res == 0)
		117	{
		118	LOG (llevError, "socket write failed, connection closed.\n");
		119	destroy ();
		120	return;
		121	}
		122	else if (errno == EINTR)
		123	{
		124	// just retry
		125	}
		126	else if (errno == EAGAIN)
		127	{
		128	// delay till ready
		129	socket_ev.poll (socket_ev.poll () \| PE_W);
		130	socket_ev.start ();
		131	return;
		132	}
		133	else
		134	{
		135	LOG (llevError, "socket write failed: %s\n", strerror (errno));
		136	destroy ();
		137	return;
		138	}
		139	}
		140
		141	socket_ev.poll (socket_ev.poll () & ~PE_W);
		142	}
		143
		144	/******************************************************************************
		145	*
		146	* Start of read routines.
		147	*
		148	******************************************************************************/
		149
		150	int
		151	client::next_packet ()
		152	{
		153	if (inbuf_len >= 2)
		154	{
		155	int pkt_len = (inbuf [0] << 8) \| inbuf [1];
		156
		157	if (inbuf_len >= 2 + pkt_len)
		158	return 2 + pkt_len;
		159
		160	if (inbuf_len == sizeof (inbuf))
		161	{
		162	send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED);
		163	destroy ();
		164	return -1;
		165	}
		166	}
		167
		168	return 0;
		169	}
		170
		171	void
		172	client::skip_packet (int len)
		173	{
		174	inbuf_len -= len;
		175	memmove (inbuf, inbuf + len, inbuf_len);
		176	}
		177
87	/***********************************************************************	178	/*****************************************************************************
88	*	179	* Start of command dispatch area.
89	* SockList functions/utilities	180	* The commands here are protocol commands.
90	*
91	**********************************************************************/	181	****************************************************************************/
92		182
93	void SockList_Init(SockList *sl)	183	// SocketCommand, PlayingCommand, should not exist with those ugly casts
94	{	184	#define SC(cb) (void )static_cast<void ()(char , int, client )>(cb),
95	sl->len=0;	185	#define PC(cb) (void )static_cast<void ()(char , int, player )>(cb), PF_PLAYER \|
96	sl->buf=NULL;
97	}
98		186
99	void SockList_AddChar(SockList *sl, char c)	187	/**
100	{	188	* Dispatch table for the server.
101	sl->buf[sl->len]=c;
102	sl->len++;
103	}
104
105	void SockList_AddShort(SockList *sl, uint16 data)
106	{
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	*/	189	*/
136	int GetInt_String(unsigned char *data)	190	static struct packet_type packets[] = {
137	{	191	{"ncom", PC(NewPlayerCmd) PF_PLAYING \| PF_COMMAND6 },
138	return ((data[0]<<24) + (data[1]<<16) + (data[2]<<8) + data[3]);	192	{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND0 },
139	}
140		193
141	short GetShort_String(unsigned char *data) {	194	{"examine", PC(ExamineCmd) PF_PLAYING },
142	return ((data[0]<<8)+data[1]);	195	{"apply", PC(ApplyCmd) PF_PLAYING },
143	}	196	{"lookat", PC(LookAt) PF_PLAYING },
		197	{"lock", PC(LockItem) PF_PLAYING },
		198	{"mark", PC(MarkItem) PF_PLAYING },
		199	{"move", PC(MoveCmd) PF_PLAYING },
		200	{"ext", PC(ExtCmd) 0 }, /* CF+ */
		201	{"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */
		202	{"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */
144		203
145	/******************************************************************************	204	{"reply", SC(ReplyCmd) 0 },
146	*	205	{"exti", SC(ExtiCmd) 0 }, /* CF+ */
147	* Start of read routines.	206	{"addme", SC(AddMeCmd) 0 },
148	*	207	{"askface", SC(SendFaceCmd) 0 }, /* Added: phil */
149	******************************************************************************/	208	{"requestinfo", SC(RequestInfo) 0 },
		209	{"setfacemode", SC(SetFaceMode) 0 },
		210	{"setsound", SC(SetSound) 0 },
		211	{"setup", SC(SetUp) 0 },
		212	{"version", SC(VersionCmd) 0 },
		213	{"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /Added: tchize /
		214	{"toggleextendedtext", SC(ToggleExtendedText) 0 }, /Added: tchize /
		215	{"asksmooth", SC(AskSmooth) 0 }, /Added: tchize (smoothing technologies) /
		216	};
150		217
151	/**	218	bool
152	* This reads from fd and puts the data in sl. We return true if we think	219	client::may_execute (const packet_type *pkt) const
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	{	220	{
161	int stat,toread;	221	return (!(pkt->flags & PF_PLAYER) \|\| pl)
		222	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
		223	}
162		224
163	/* Sanity check - shouldn't happen */	225	// HACK: some commands currently should be executed
164	if (sl->len < 0) {	226	// even when the player is frozen. this hack detects
165	abort();	227	// those commands. it should be folded into may_execute,
		228	// but kept seperate to emphasise the hack aspect, i.e.
		229	// do it better, then remove.
		230	static bool
		231	always_immediate (const client ns, const packet_type pkt, const char *data, int len)
		232	{
		233	if (!(pkt->flags & (PF_COMMAND0 \| PF_COMMAND6)))
		234	return false;
		235
		236	if (!ns->pl \|\| !ns->pl->ob \|\| !ns->pl->ob->map)
		237	return false;
		238
		239	if (pkt->flags & PF_COMMAND6)
166	}	240	{
167	/* We already have a partial packet */	241	data += 6;
168	if (sl->len<2) {	242	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	}	243	}
192	#else	244
193	if (errno != EAGAIN && errno !=EWOULDBLOCK) {	245	if (len > 4 && !strncmp (data, "say " , 4))
194	LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno));	246	return true;
		247	if (len > 5 && !strncmp (data, "chat ", 5))
		248	return true;
		249
		250	return false;
		251	}
		252
		253	void
		254	client::execute (const packet_type pkt, char data, int datalen)
		255	{
		256	if (may_execute (pkt) \|\| always_immediate (this, pkt, data, datalen))
		257	{
		258	//TODO: only one format
		259	if (pkt->flags & PF_PLAYER)
		260	((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
		261	else
		262	((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
195	}	263	}
196	#endif	264	else
197	return 0; /Error /	265	send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
198	}	266	}
199	if (stat==0) return -1;	267
200	sl->len += stat;	268	bool
201	#ifdef CS_LOGSTATS	269	client::handle_packet ()
202	cst_tot.ibytes += stat;	270	{
203	cst_lst.ibytes += stat;	271	int pkt_len = next_packet ();
204	#endif	272
205	if (stat<2) return 0; /* Still don't have a full packet */	273	if (!pkt_len)
		274	return false;
		275	else if (pkt_len < 0)
206	}	276	{
207	/* Figure out how much more data we need to read. Add 2 from the	277	LOG (llevError, "read error on player %s\n",
208	* end of this - size header information is not included.	278	pl && pl->ob ? &pl->ob->name : "[anonymous]");
209	*/	279	destroy ();
210	toread = 2+(sl->buf[0] << 8) + sl->buf[1] - sl->len;	280	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	}	281	}
247	#else	282
248	if (errno != EAGAIN && errno !=EWOULDBLOCK) {	283	inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
249	LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno));	284
		285	/* First, break out beginning word. There are at least
		286	* a few commands that do not have any paremeters. If
		287	* we get such a command, don't worry about trying
		288	* to break it up.
		289	*/
		290	int datalen;
		291	char data = strchr ((char )inbuf + 2, ' ');
		292
		293	if (data)
		294	{
		295	*data++ = 0;
		296	datalen = pkt_len - (data - (char *)inbuf);
250	}	297	}
251	#endif	298	else
252	return 0; /Error /	299	{
253	}	300	data = (char *)inbuf + 2; // better read garbage than segfault
254	if (stat==0) return -1;	301	datalen = 0;
255	sl->len += stat;	302	}
256	#ifdef CS_LOGSTATS	303
257	cst_tot.ibytes += stat;	304	for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
258	cst_lst.ibytes += stat;	305	if (!strcmp ((char *)inbuf + 2, pkt->name))
259	#endif	306	{
260	toread -= stat;	307	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
261	if (toread==0) return 1;	308	queue_command (pkt, data, datalen);
262	if (toread < 0) {	309	else
263	LOG(llevError,"SockList_ReadPacket: Read more bytes than desired.\n");	310	execute (pkt, data, datalen);
264	return 1;	311
265	}	312	goto next_packet;
266	} while (toread>0);	313	}
		314
		315	// If we get here, we didn't find a valid command.
		316	send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
		317	next_packet:
		318	skip_packet (pkt_len);
		319
		320	// input buffer has space again
		321	socket_ev.poll (socket_ev.poll () \| PE_R);
		322
		323	return true;
		324	}
		325
		326	// callback called when socket is either readable or writable
		327	void
		328	client::socket_cb (iow &w, int got)
		329	{
		330	//TODO remove when we have better socket cleanup logic
		331	if (destroyed ())
		332	{
		333	socket_ev.poll (0);
267	return 0;	334	return;
		335	}
		336
		337	if (got & PE_W)
		338	{
		339	write_outputbuffer ();
		340
		341	if (!outputbuffer.len)
		342	socket_ev.poll (socket_ev.poll () & ~PE_W);
		343	}
		344
		345	if (got & PE_R)
		346	{
		347	//TODO: rate-limit tcp connection in better ways, important
		348
		349	int amount = sizeof (inbuf) - inbuf_len;
		350
		351	if (!amount)
		352	{
		353	// input buffer full
		354	socket_ev.poll (socket_ev.poll () & ~PE_R);
		355	return;
		356	}
		357
		358	amount = read (fd, inbuf + inbuf_len, amount);
		359
		360	if (!amount)
		361	{
		362	destroy ();
		363	return;
		364	}
		365	else if (amount < 0)
		366	{
		367	if (errno != EAGAIN && errno != EINTR)
		368	{
		369	LOG (llevError, "read error: %s\n", strerror (errno));
		370	destroy ();
		371	return;
		372	}
		373
		374	// should not be here, normally
		375	}
		376	else
		377	{
		378	inbuf_len += amount;
		379
		380	cst_tot.ibytes += amount;
		381	cst_lst.ibytes += amount;
		382
		383	cmd_ev.start ();
		384	}
		385	}
		386	}
		387
		388	// called whenever we have additional commands to process
		389	void
		390	client::cmd_cb (iw &w)
		391	{
		392	if (handle_packet ())
		393	w.start ();
		394	else
		395	flush ();
268	}	396	}
269		397
270	/*******************************************************************************	398	/*******************************************************************************
271	*	399	*
272	* Start of write related routines.	400	* Start of write related routines.
…		…
277	* Adds data to a socket buffer for whatever reason.	405	* Adds data to a socket buffer for whatever reason.
278	*	406	*
279	* ns is the socket we are adding the data to, buf is the start of the	407	* 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.	408	* data, and len is the number of bytes to add.
281	*/	409	*/
282		410	void
283	static void add_to_buffer(NewSocket ns, char buf, int len)	411	client::send (void *buf_, int len)
284	{	412	{
		413	char buf = (char )buf_;
		414
		415	if (destroyed () \|\| !buf)
		416	return;
		417
		418	if (len + outputbuffer.len > SOCKETBUFSIZE)
		419	{
		420	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
		421	destroy ();
		422	return;
		423	}
		424
285	int avail, end;	425	int avail, end;
286		426
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	427	/* data + end is where we start putting the new data. The last byte
295	* currently in use is actually data + end -1	428	* currently in use is actually data + end -1
296	*/	429	*/
297
298	end=ns->outputbuffer.start + ns->outputbuffer.len;	430	end = outputbuffer.start + outputbuffer.len;
299	/* The buffer is already in a wrapped state, so adjust end */	431	/* The buffer is already in a wrapped state, so adjust end */
300	if (end>=SOCKETBUFSIZE) end-=SOCKETBUFSIZE;	432	if (end >= SOCKETBUFSIZE)
		433	end -= SOCKETBUFSIZE;
		434
301	avail=SOCKETBUFSIZE - end;	435	avail = SOCKETBUFSIZE - end;
302		436
303	/* We can all fit it behind the current data without wrapping */	437	/* We can all fit it behind the current data without wrapping */
304	if (avail >=len ) {	438	if (avail >= len)
305	memcpy(ns->outputbuffer.data + end, buf, len);	439	memcpy (outputbuffer.data + end, buf, len);
		440	else
306	}	441	{
307	else {
308	memcpy(ns->outputbuffer.data + end, buf, avail);	442	memcpy (outputbuffer.data + end, buf, avail);
309	memcpy(ns->outputbuffer.data, buf+avail, len-avail);	443	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	}	444	}
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		445
376	/**	446	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	}	447	}
443
444		448
445	/**	449	/**
446	* Takes a string of data, and writes it out to the socket. A very handy	450	* Takes a string of data, and writes it out to the socket. A very handy
447	* shortcut function.	451	* shortcut function.
448	*/	452	*/
449	void cs_write_string(NewSocket ns, const char buf, int len)	453	void
		454	client::send_packet (packet &sl)
450	{	455	{
451	SockList sl;	456	if (destroyed ())
		457	return;
452		458
453	sl.len = len;
454	sl.buf = (unsigned char*)buf;
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) {	459	if (sl.length () >= MAXSOCKBUF)
		460	{
473	LOG(llevError,"Trying to send a buffer beyond properly size, len =%d\n",	461	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	462	/* Almost certainly we've overflowed a buffer, so quit now to make
476	* it easier to debug.	463	* it easier to debug.
477	*/	464	*/
478	abort();	465	abort ();
479	}	466	}
480	sbuf[0] = ((uint32)(msg->len) >> 8) & 0xFF;
481	sbuf[1] = ((uint32)(msg->len)) & 0xFF;
482	if (ns->status != Ns_Old)
483	Write_To_Socket(ns, (char *) sbuf, 2);
484	Write_To_Socket(ns, (char*)msg->buf, msg->len);
485	}
486		467
487	/**	468	if (!sl.length ())
488	* Takes a string of data, and writes it out to the socket. A very handy	469	return;
489	* shortcut function.	470
		471	assert (sl.hdrlen == 2);
		472
		473	sl.buf_ [0] = sl.length () >> 8;
		474	sl.buf_ [1] = sl.length () ;
		475
		476	send (sl.buf_, sl.length () + sl.hdrlen);
		477	}
		478
		479	void
		480	client::send_packet (const char *buf, int len)
		481	{
		482	packet sl;
		483
		484	sl << data (buf, len);
		485	send_packet (sl);
		486	}
		487
		488	void
		489	client::send_packet (const char *buf)
		490	{
		491	send_packet (buf, strlen (buf));
		492	}
		493
		494	void
		495	client::send_packet_printf (const char *format, ...)
		496	{
		497	packet sl;
		498
		499	va_list ap;
		500	va_start (ap, format);
		501	sl.vprintf (format, ap);
		502	va_end (ap);
		503
		504	send_packet (sl);
		505	}
		506
		507	/***********************************************************************
490	*/	508	*
491	void Write_String_To_Socket(NewSocket ns, char buf, int len)	509	* packet functions/utilities
492	{	510	*
493	SockList sl;	511	**********************************************************************/
494		512
495	sl.len = len;	513	packet::packet (const char *name)
496	sl.buf = (unsigned char*) buf;	514	{
497	Send_With_Handling(ns, &sl);	515	reset ();
498	}
499		516
		517	int len = strlen (name);
		518	memcpy (cur, name, len); cur += len;
		519	*cur++ = ' ';
		520	}
		521
		522	packet &packet::operator <<(const data &v)
		523	{
		524	if (room () < v.len)
		525	reset ();
		526	else
		527	{
		528	if (v.len)
		529	{
		530	memcpy (cur, v.ptr, v.len);
		531	cur += v.len;
		532	}
		533	}
		534
		535	return *this;
		536	}
		537
		538	packet &packet::operator <<(const data8 &v)
		539	{
		540	unsigned int len = min (v.len, 0x00FF);
		541	return *this << uint8 (len) << data (v.ptr, len);
		542	}
		543
		544	packet &packet::operator <<(const data16 &v)
		545	{
		546	unsigned int len = min (v.len, 0xFFFF);
		547	return *this << uint16 (len) << data (v.ptr, len);
		548	}
		549
		550	packet &packet::operator <<(const char *v)
		551	{
		552	return *this << data (v, strlen (v ? v : 0));
		553	}
		554
		555	void
		556	packet::vprintf (const char *format, va_list ap)
		557	{
		558	int size = room ();
		559
		560	int len = vsnprintf ((char *)cur, size, format, ap);
		561
		562	if (len >= size)
		563	return reset ();
		564
		565	cur += len;
		566	}
500		567
501	/******************************************************************************	568	/******************************************************************************
502	*	569	*
503	* statistics logging functions.	570	* statistics logging functions.
504	*	571	*
505	******************************************************************************/	572	******************************************************************************/
506		573
507	#ifdef CS_LOGSTATS	574	#ifdef CS_LOGSTATS
		575
508	/* cst_tot is for the life of the server, cst_last is for the last series of	576	/* cst_tot is for the life of the server, cst_last is for the last series of
509	* stats	577	* stats
510	*/	578	*/
511	CS_Stats cst_tot, cst_lst;	579	CS_Stats cst_tot, cst_lst;
512		580
513	/**	581	/**
514	* Writes out the gathered stats. We clear cst_lst.	582	* Writes out the gathered stats. We clear cst_lst.
515	*/	583	*/
		584	void
516	void write_cs_stats(void)	585	write_cs_stats (void)
517	{	586	{
518	time_t now=time(NULL);	587	time_t now = time (NULL);
519		588
520	/* If no connections recently, don't both to log anything */	589	/* If no connections recently, don't both to log anything */
521	if (cst_lst.ibytes==0 && cst_lst.obytes==0) return;	590	if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
		591	return;
522		592
523	/* CSSTAT is put in so scripts can easily find the line */	593	/* 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",	594	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,	595	ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
526	now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes,	596	now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
527	cst_lst.max_conn, now - cst_lst.time_start);
528	cst_lst.ibytes=0;	597	cst_lst.ibytes = 0;
529	cst_lst.obytes=0;	598	cst_lst.obytes = 0;
530	cst_lst.max_conn=socket_info.nconns;
531	cst_lst.time_start=now;	599	cst_lst.time_start = now;
532	}	600	}
533	#endif	601	#endif
		602

Diff Legend

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

Comparing deliantra/server/socket/lowlevel.C (file contents): Revision 1.1 by elmex, Sun Aug 13 17:16:06 2006 UTC vs. Revision 1.34 by pippijn, Thu Mar 1 12:28:17 2007 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 1.34 by pippijn, Thu Mar 1 12:28:17 2007 UTC