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

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.6 by root, Thu Sep 14 22:34:06 2006 UTC vs.
Revision 1.100 by root, Wed Nov 14 23:24:27 2018 UTC

…		…
1	/*	1	/*
2	CrossFire, A Multiplayer game for X-windows	2	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
3		3	*
4	Copyright (C) 1992 Frank Tore Johansen	4	* Copyright (©) 2018 Marc Alexander Lehmann / the Deliantra team
5		5	* Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
6	This program is free software; you can redistribute it and/or modify	6	*
		7	* Deliantra is free software: you can redistribute it and/or modify it under
7	it under the terms of the GNU General Public License as published by	8	* the terms of the Affero GNU General Public License as published by the
8	the Free Software Foundation; either version 2 of the License, or	9	* Free Software Foundation, either version 3 of the License, or (at your
9	(at your option) any later version.	10	* option) any later version.
10		11	*
11	This program is distributed in the hope that it will be useful,	12	* This program is distributed in the hope that it will be useful,
12	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	GNU General Public License for more details.	15	* GNU General Public License for more details.
15		16	*
16	You should have received a copy of the GNU General Public License	17	* You should have received a copy of the Affero GNU General Public License
17	along with this program; if not, write to the Free Software	18	* and the GNU General Public License along with this program. If not, see
18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.	19	* <http://www.gnu.org/licenses/>.
19
20	The author can be reached via e-mail to mark@pyramid.com
21	*/
22
23	/**
24	* \file
25	* Low-level socket-related functions.
26	*	20	*
27	* \date 2003-12-02	21	* The authors can be reached via e-mail to <support@deliantra.net>
28	*
29	* Contains some base functions that both the client and server
30	* can use. As such, depending what we are being compiled for will
31	* determine what we can include. the client is designed have
32	* CFCLIENT defined as part of its compile flags.
33	*/	22	*/
34		23
35	using namespace std;	24	using namespace std;
36		25
37	#include <global.h>	26	#include <global.h>
38	#include <newclient.h>
39	#include <sproto.h>	27	#include <sproto.h>
		28	#include <cstdarg>
40		29
41	#ifdef __linux__	30	#if HAVE_TCP_INFO
42	# include <sys/types.h>	31	# include <sys/types.h>
43	# include <sys/socket.h>	32	# include <sys/socket.h>
44	# include <netinet/in.h>	33	# include <netinet/in.h>
45	# define TCP_HZ 1000 // sorry...
46	# include <netinet/tcp.h>	34	# include <netinet/tcp.h>
47	#endif	35	#endif
48		36
49	// use a really low timeout, as it doesn't cost any bandwidth, and you can	37	// force a packet when idle for more than this many seconds,
50	// easily die in 20 seconds...	38	// forcing an ack regularly.
51	#define SOCKET_TIMEOUT1 10	39	#define IDLE_PING 2.
52	#define SOCKET_TIMEOUT2 20
53		40
54	void	41	void
55	Socket_Flush (NewSocket * ns)	42	client::flush ()
56	{	43	{
57	#ifdef __linux__	44	if (destroyed ())
58	// check time of last ack, and, if too old, kill connection	45	return;
59	struct tcp_info tcpi;
60	socklen_t len = sizeof (tcpi);
61		46
62	if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))	47	/**
63	{	48	* Writes data to socket.
64	unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;	49	*
		50	* When the socket is clear to write, and we have backlogged data, this
		51	* is called to write it out.
		52	*/
65		53
66	if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s	54	// write a nop to the socket at least every IDLE_PING seconds.
67	&& SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s	55	if (!outputbuffer.len)
68	{	56	{
69	LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd,	57	if (last_send + IDLE_PING <= NOW && pl && pl->active)
70	(unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
71	ns->status = Ns_Dead;
72	}	58	{
		59	// this is a bit ugly, but map1a seems to be the only
		60	// nop'able command and it is quite small.
		61	packet sl ("map1a");
		62	send_packet (sl);
		63	}
		64	else
		65	return;
		66	}
		67
		68	if (socket_ev.poll () & EV_WRITE)
		69	return;
		70
		71	last_send = NOW;
		72	write_outputbuffer ();
		73	}
		74
		75	void
		76	client::write_outputbuffer ()
		77	{
		78	while (outputbuffer.len)
73	}	79	{
		80	int res = write (fd, outputbuffer.data + outputbuffer.start,
		81	min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
74		82
75	int val;	83	if (res > 0)
		84	{
		85	outputbuffer.start += res;
		86	/* wrap back to start of buffer */
		87	if (outputbuffer.start == SOCKETBUFSIZE)
		88	outputbuffer.start = 0;
76		89
77	val = 0;	90	outputbuffer.len -= res;
78	setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));	91	}
79	val = 1;	92	else if (res == 0)
80	setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));	93	{
81	#endif	94	LOG (llevError, "socket write failed, connection closed.\n");
82	}	95	destroy ();
		96	return;
		97	}
		98	else if (errno == EINTR)
		99	{
		100	// just retry
		101	}
		102	else if (errno == EAGAIN)
		103	{
		104	// delay till ready
		105	socket_ev.poll (socket_ev.poll () \| EV_WRITE);
		106	socket_ev.start ();
		107	return;
		108	}
		109	else
		110	{
		111	LOG (llevError, "socket write failed: %s\n", strerror (errno));
		112	destroy ();
		113	return;
		114	}
		115	}
83		116
		117	socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
		118	}
		119
		120	/******************************************************************************
		121	*
		122	* Start of read routines.
		123	*
		124	******************************************************************************/
		125
		126	int
		127	client::next_packet ()
		128	{
		129	if (inbuf_len >= 2)
		130	{
		131	int pkt_len = (inbuf [0] << 8) \| inbuf [1];
		132
		133	if (inbuf_len >= 2 + pkt_len)
		134	return 2 + pkt_len;
		135
		136	if (inbuf_len == sizeof (inbuf))
		137	{
		138	send_packet_printf ("msg %d log input buffer overflow - closing connection.", NDI_RED \| NDI_REPLY);
		139	destroy ();
		140	return -1;
		141	}
		142	}
		143
		144	return 0;
		145	}
		146
		147	void
		148	client::skip_packet (int len)
		149	{
		150	inbuf_len -= len;
		151	memmove (inbuf, inbuf + len, inbuf_len);
		152	}
		153
84	/***********************************************************************	154	/*****************************************************************************
85	*	155	* Start of command dispatch area.
86	* SockList functions/utilities	156	* The commands here are protocol commands.
87	*
88	**********************************************************************/	157	****************************************************************************/
89		158
90	void	159	// SocketCommand, PlayingCommand, should not exist with those ugly casts
91	SockList_Init (SockList * sl)	160	#define SC(cb) (void )static_cast<void ()(char , int, client )>(cb),
92	{	161	#define PC(cb) (void )static_cast<void ()(char , int, player )>(cb), PF_PLAYER \|
93	sl->len = 0;
94	sl->buf = NULL;
95	}
96		162
97	void	163	static void
98	SockList_AddInt (SockList * sl, uint32 data)	164	NopCmd (char , int, client )
99	{	165	{
100	sl->buf[sl->len++] = (data >> 24) & 0xff;	166	// do nothing
101	sl->buf[sl->len++] = (data >> 16) & 0xff;
102	sl->buf[sl->len++] = (data >> 8) & 0xff;
103	sl->buf[sl->len++] = data & 0xff;
104	}	167	}
105		168
106	void	169	/**
107	SockList_AddInt64 (SockList * sl, uint64 data)	170	* Dispatch table for the server.
108	{
109	sl->buf[sl->len++] = (char) ((data >> 56) & 0xff);
110	sl->buf[sl->len++] = (char) ((data >> 48) & 0xff);
111	sl->buf[sl->len++] = (char) ((data >> 40) & 0xff);
112	sl->buf[sl->len++] = (char) ((data >> 32) & 0xff);
113
114	sl->buf[sl->len++] = (char) ((data >> 24) & 0xff);
115	sl->buf[sl->len++] = (char) ((data >> 16) & 0xff);
116	sl->buf[sl->len++] = (char) ((data >> 8) & 0xff);
117	sl->buf[sl->len++] = (char) (data & 0xff);
118	}
119
120	/* Basically does the reverse of SockList_AddInt, but on
121	* strings instead. Same for the GetShort, but for 16 bits.
122	*/	171	*/
123	int	172	static struct packet_type packets[] = {
124	GetInt_String (unsigned char *data)	173	{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND },
125	{
126	return ((data[0] << 24) + (data[1] << 16) + (data[2] << 8) + data[3]);
127	}
128		174
129	short	175	{"examine", PC(ExamineCmd) PF_PLAYING },
130	GetShort_String (unsigned char *data)	176	{"ex", PC(ExCmd) PF_PLAYING },
131	{	177	{"apply", PC(ApplyCmd) PF_PLAYING },
132	return ((data[0] << 8) + data[1]);	178	{"lookat", PC(LookAt) PF_PLAYING },
133	}	179	{"lock", PC(LockItem) PF_PLAYING },
		180	{"mark", PC(MarkItem) PF_PLAYING },
		181	{"move", PC(MoveCmd) PF_PLAYING },
		182	{"ext", PC(ExtCmd) 0 }, // CF+/Deliantra
		183	{"mapredraw", PC(MapRedrawCmd) 0 },
		184	{"mapinfo", PC(MapInfoCmd) 0 }, // CF+/Deliantra
134		185
135	/******************************************************************************	186	{"reply", SC(ReplyCmd) 0 },
136	*	187	{"exti", SC(ExtiCmd) 0 }, // CF+/Deliantra
137	* Start of read routines.	188	{"addme", SC(AddMeCmd) 0 },
138	*	189	{"askface", SC(AskFaceCmd) 0 },
139	******************************************************************************/	190	{"requestinfo", SC(RequestInfo) 0 },
		191	{"setsound", SC(SetSound) 0 },
		192	{"setup", SC(SetUp) 0 },
		193	{"version", SC(VersionCmd) 0 },
140		194
141	/**	195	{"toggleextendedtext", SC(NopCmd) 0 }, // deliantra: disabled
142	* This reads from fd and puts the data in sl. We return true if we think	196	};
143	* we have a full packet, 0 if we have a partial packet. The only processing
144	* we do is remove the intial size value. len (As passed) is the size of the
145	* buffer allocated in the socklist. We make the assumption the buffer is
146	* at least 2 bytes long.
147	*/
148		197
149	int	198	bool
150	SockList_ReadPacket (int fd, SockList * sl, int len)	199	client::may_execute (const packet_type *pkt) const
151	{	200	{
152	int stat, toread;	201	return (!(pkt->flags & PF_PLAYER) \|\| pl)
		202	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
		203	}
153		204
154	/* Sanity check - shouldn't happen */	205	// HACK: some commands currently should be executed
155	if (sl->len < 0)	206	// even when the player is frozen. this hack detects
156	{	207	// those commands. it should be folded into may_execute,
157	abort ();	208	// but kept seperate to emphasise the hack aspect, i.e.
		209	// do it better, then remove.
		210	static bool
		211	always_immediate (const client ns, const packet_type pkt, const char *data, int len)
		212	{
		213	if (!(pkt->flags & PF_COMMAND))
		214	return false;
		215
		216	if (!ns->pl \|\| !ns->pl->ob \|\| !ns->pl->ob->map)
		217	return false;
		218
		219	if (len > 4 && data [ 3] == ' ' && !strncmp (data, "say " , 4)) return true;
		220	if (len > 5 && data [ 4] == ' ' && !strncmp (data, "chat " , 5)) return true;
		221	if (len > 6 && data [ 5] == ' ' && !strncmp (data, "shout " , 6)) return true;
		222	if (len > 8 && data [ 7] == ' ' && !strncmp (data, "suicide " , 8)) return true;
		223	if (len > 18 && data [17] == ' ' && !strncmp (data, "accept-invitation ", 18)) return true;
		224
		225	if (len == 7 && !strcmp (data, "suicide")) return true;
		226
		227	return false;
		228	}
		229
		230	void
		231	client::execute (const packet_type pkt, char data, int datalen)
		232	{
		233	if (may_execute (pkt) \|\| always_immediate (this, pkt, data, datalen))
158	}	234	{
159	/* We already have a partial packet */	235	//TODO: only one format
160	if (sl->len < 2)	236	if (pkt->flags & PF_PLAYER)
161	{
162	#ifdef WIN32 /* **WIN32 SockList_ReadPacket: change read() to recv() /
163
164	stat = recv (fd, sl->buf + sl->len, 2 - sl->len, 0);
165
166	#else
167	do
168	{
169	stat = read (fd, sl->buf + sl->len, 2 - sl->len);
170	}	237	{
171	while ((stat == -1) && (errno == EINTR));	238	((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
172	#endif	239	pl->need_updated_stats ();
173	if (stat < 0)
174	{	240	}
175	/* In non blocking mode, EAGAIN is set when there is no	241	else
176	* data available.	242	((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
177	*/	243	}
178	#ifdef WIN32 /* **WIN32 SockList_ReadPacket: error handling for win32 /	244	else
179	if ((stat == -1) && WSAGetLastError () != WSAEWOULDBLOCK)	245	send_packet_printf ("msg %d log ERROR: you cannot execute '%s' now.", NDI_RED \| NDI_REPLY, pkt->name);
		246	}
		247
		248	bool
		249	client::handle_packet ()
		250	{
		251	int pkt_len = next_packet ();
		252
		253	if (!pkt_len)
		254	return false;
		255	else if (pkt_len < 0)
		256	{
		257	LOG (llevError, "read error on player %s\n",
		258	pl && pl->ob ? &pl->ob->name : "[anonymous]");
		259	destroy ();
		260	return false;
		261	}
		262
		263	uint8_t save_byte = inbuf [pkt_len]; // rather ugly
		264	inbuf [pkt_len] = 0; /* temporarily terminate buffer - useful for string data */
		265
		266	/* First, break out beginning word. There are at least
		267	* a few commands that do not have any paremeters. If
		268	* we get such a command, don't worry about trying
		269	* to break it up.
		270	*/
		271	int datalen;
		272	char data = strchr ((char )inbuf + 2, ' ');
		273
		274	if (data)
		275	{
		276	*data++ = 0;
		277	datalen = pkt_len - (data - (char *)inbuf);
		278	}
		279	else
		280	{
		281	data = (char *)inbuf + 2; // better read garbage than segfault
		282	datalen = 0;
		283	}
		284
		285	for (packet_type *pkt = packets; pkt < packets + array_length (packets); ++pkt)
		286	if (!strcmp ((char *)inbuf + 2, pkt->name))
		287	{
		288	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
		289	queue_command (pkt, data, datalen);
		290	else
		291	execute (pkt, data, datalen);
		292
		293	goto next_packet;
		294	}
		295
		296	// If we get here, we didn't find a valid command.
		297	send_packet_printf ("msg %d log ERROR: command '%s' not supported.", NDI_RED \| NDI_REPLY, (char *)inbuf + 2);
		298
		299	next_packet:
		300	inbuf [pkt_len] = save_byte; // rather ugly
		301	skip_packet (pkt_len);
		302
		303	// input buffer has space again
		304	socket_ev.poll (socket_ev.poll () \| EV_READ);
		305
		306	return true;
		307	}
		308
		309	void
		310	client::inbuf_handle ()
		311	{
		312	if (!handle_packet ())
		313	return;
		314
		315	while (handle_packet ())
		316	;
		317
		318	flush ();
		319	}
		320
		321	// callback called when socket is either readable or writable
		322	void
		323	client::socket_cb (iow &w, int revents)
		324	{
		325	//TODO remove when we have better socket cleanup logic
		326	if (destroyed ())
		327	{
		328	socket_ev.poll (0);
		329	return;
		330	}
		331
		332	if (revents & EV_WRITE)
		333	{
		334	write_outputbuffer ();
		335
		336	if (!outputbuffer.len)
		337	socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
		338	}
		339
		340	if (revents & EV_READ)
		341	{
		342	int amount;
		343	uint8 *rbuf;
		344
		345	if (ws_version)
		346	{
		347	if (ws_inbuf_len + 2048 > ws_inbuf_alloc)
		348	ws_inbuf = (uint8 *)realloc (ws_inbuf, ws_inbuf_alloc += 4096);
		349
		350	rbuf = ws_inbuf + ws_inbuf_len;
		351	amount = ws_inbuf_alloc - ws_inbuf_len;
		352	}
		353	else
		354	{
		355	rbuf = inbuf + inbuf_len;
		356	amount = sizeof (inbuf) - inbuf_len;
		357	}
		358
		359	if (!amount)
		360	{
		361	// input buffer full
		362	LOG (llevError, "input buffer overflow.");
		363	destroy ();
		364	return;
		365	}
		366
		367	amount = read (fd, rbuf, amount);
		368
		369	if (!amount)
		370	{
		371	destroy ();
		372	return;
		373	}
		374	else if (amount < 0)
		375	{
		376	if (errno != EAGAIN && errno != EINTR)
180	{	377	{
181	if (WSAGetLastError () == WSAECONNRESET)	378	LOG (llevError, "read error: %s\n", strerror (errno));
182	LOG (llevDebug, "Connection closed by client\n");	379	destroy ();
		380	return;
183	else	381	}
		382
		383	// should not be here, normally
		384	}
		385
		386	if (ws_version)
		387	{
		388	ws_inbuf_len += amount;
		389
		390	while (ws_inbuf_len)
		391	{
		392	if (ws_inbuf_len < 2 + 4) // 6 is minimum length: op, len, mask
		393	break;
		394
		395	int d = 2;
		396	int fin = ws_inbuf [0] & 0x80;
		397	int op = ws_inbuf [0] & 0x0f;
		398	int len = ws_inbuf [1] & 0x7f;
		399
		400	if (len == 126)
184	{	401	{
185	LOG (llevDebug, "ReadPacket got error %d, returning 0\n", WSAGetLastError ());	402	len = (ws_inbuf [2] << 8) \| ws_inbuf [3];
		403	d += 2;
186	}	404	}
187	return -1; /* kick this user! */	405	else if (len == 127)
		406	{
		407	if (ws_inbuf_len < 2 + 8)
		408	return;
		409
		410	// we don't do extra long frames, if a browser wants to send >2**32 bytes,
		411	// there are bigger issues to fix.
		412	len = (ws_inbuf [8] << 8) \| ws_inbuf [9];
		413	d += 8;
		414	}
		415
		416	// we only continue if we have a complete frame
		417	if (ws_inbuf_len < d + 4 + len)
		418	return;
		419
		420	switch (op)
		421	{
		422	case 0: op = ws_inbuf_type; break; // continuation
		423	case 1: ws_inbuf_type = 1; break; // utf-8
		424	case 2: ws_inbuf_type = 2; break; // binary
		425	}
		426
		427	if (len > sizeof (inbuf) - inbuf_len)
		428	{
		429	// input buffer full
		430	LOG (llevError, "input buffer overflow (ws).");
		431	destroy ();
		432	return;
		433	}
		434
		435	uint8 *buf = inbuf + inbuf_len + 2;
		436
		437	for (int i = 0; i < len; ++i)
		438	buf [i] = ws_inbuf [d + 4 + i] ^ ws_inbuf [d + (i & 3)];
		439
		440	// remove frame
		441	ws_inbuf_len -= d + 4 + len;
		442	memmove (ws_inbuf, ws_inbuf + d + 4 + len, ws_inbuf_len);
		443
		444	switch (op)
		445	{
		446	case 1: // utf-8
		447	// utf-8 encoded frames cannot have full length (MAXSOCKBUF) in all cases
		448	// but we assume that these extra-long packets will be rare.
		449	{
		450	uint8 *a = buf;
		451	uint8 *b = a;
		452	uint8 *c = a + len;
		453
		454	for (; a < c; ++a, ++b)
		455	{
		456	b = a;
		457
		458	if (*a >= 0x80)
		459	*b = (a [0] & 0x1f) << 6 \| (a [1] & 0x3f), ++a;
		460	}
		461
		462	len -= a - b;
		463	}
		464	/* FALLTHROUGH */
		465	case 2: // binary
		466	inbuf_len += len;
		467
		468	if (fin)
		469	{
		470	inbuf [0] = inbuf_len >> 8;
		471	inbuf [1] = inbuf_len;
		472
		473	inbuf_len += 2;
		474
		475	inbuf_handle ();
		476	}
		477	break;
		478
		479	case 9: // ping
		480	{
		481	// send pong - we assume ping messages are <64k
		482	// as we can't handle >10k at the moment anyway.
		483	uint8 hdr [] = { 0x8a, 126, len >> 8, len };
		484	send (hdr, sizeof (hdr));
		485	send (inbuf + inbuf_len, len);
		486	}
		487	break;
		488
		489	case 10: // pong
		490	break;
		491
		492	case 8: // close
		493	default:
		494	destroy ();
		495	return;
		496	}
188	}	497	}
189	#else
190	if (errno != EAGAIN && errno != EWOULDBLOCK)
191	{
192	LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));
193	}
194	#endif
195	return 0; /Error /
196	}
197	if (stat == 0)
198	return -1;
199	sl->len += stat;
200	#ifdef CS_LOGSTATS
201	cst_tot.ibytes += stat;
202	cst_lst.ibytes += stat;
203	#endif
204	if (stat < 2)
205	return 0; /* Still don't have a full packet */
206	}
207	/* Figure out how much more data we need to read. Add 2 from the
208	* end of this - size header information is not included.
209	*/
210	toread = 2 + (sl->buf[0] << 8) + sl->buf[1] - sl->len;
211	if ((toread + sl->len) >= len)
212	{
213	LOG (llevError, "SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n", toread + sl->len, len);
214	/* Quick hack in case for 'oldsocketmode' input. If we are
215	* closing the socket anyways, then reading this extra 100 bytes
216	* shouldn't hurt.
217	*/
218	#ifdef WIN32 /* **win32 SockList_ReadPacket: change read() to recv() /
219	recv (fd, sl->buf + 2, 100, 0);
220	#else
221	read (fd, sl->buf + 2, 100);
222	#endif /* end win32 */
223
224	/* return error so the socket is closed */
225	return -1;
226	}
227	do
228	{
229	#ifdef WIN32 /* **win32 SockList_ReadPacket: change read() to recv() /
230	stat = recv (fd, sl->buf + sl->len, toread, 0);
231	#else
232	do
233	{	498	}
234	stat = read (fd, sl->buf + sl->len, toread);	499	else
235	}	500	{
236	while ((stat < 0) && (errno == EINTR));	501	inbuf_len += amount;
237	#endif	502	inbuf_handle ();
238	if (stat < 0)
239	{	503	}
240
241	#ifdef WIN32 /* **win32 SockList_ReadPacket: change error handling for win32 /
242	if ((stat == -1) && WSAGetLastError () != WSAEWOULDBLOCK)
243	{
244	if (WSAGetLastError () == WSAECONNRESET)
245	LOG (llevDebug, "Connection closed by client\n");
246	else
247	{
248	LOG (llevDebug, "ReadPacket got error %d, returning 0\n", WSAGetLastError ());
249	}
250	return -1; /* kick this user! */
251	}
252	#else
253	if (errno != EAGAIN && errno != EWOULDBLOCK)
254	{
255	LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));
256	}
257	#endif
258	return 0; /Error /
259	}
260	if (stat == 0)
261	return -1;
262	sl->len += stat;
263	#ifdef CS_LOGSTATS
264	cst_tot.ibytes += stat;
265	cst_lst.ibytes += stat;
266	#endif
267	toread -= stat;
268	if (toread == 0)
269	return 1;
270	if (toread < 0)
271	{
272	LOG (llevError, "SockList_ReadPacket: Read more bytes than desired.\n");
273	return 1;
274	}
275	}	504	}
276	while (toread > 0);
277	return 0;
278	}	505	}
279		506
280	/*******************************************************************************	507	/*******************************************************************************
281	*	508	*
282	* Start of write related routines.	509	* Start of write related routines.
287	* Adds data to a socket buffer for whatever reason.	514	* Adds data to a socket buffer for whatever reason.
288	*	515	*
289	* ns is the socket we are adding the data to, buf is the start of the	516	* ns is the socket we are adding the data to, buf is the start of the
290	* data, and len is the number of bytes to add.	517	* data, and len is the number of bytes to add.
291	*/	518	*/
292		519	void
293	static void	520	client::send (void *buf_, int len)
294	add_to_buffer (NewSocket * ns, char *buf, int len)
295	{	521	{
		522	char buf = (char )buf_;
		523
		524	if (destroyed () \|\| !buf)
		525	return;
		526
		527	if (len + outputbuffer.len > SOCKETBUFSIZE)
		528	{
		529	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
		530	// shutdown the socket, this is safer than destroying it immediately
		531	// as lots of code in the callchain might still access the map etc.
		532	shutdown (fd, SHUT_RDWR);
		533	return;
		534	}
		535
296	int avail, end;	536	int avail, end;
297
298	if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
299	{
300	LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
301	ns->status = Ns_Dead;
302	return;
303	}
304		537
305	/* data + end is where we start putting the new data. The last byte	538	/* data + end is where we start putting the new data. The last byte
306	* currently in use is actually data + end -1	539	* currently in use is actually data + end -1
307	*/	540	*/
308
309	end = ns->outputbuffer.start + ns->outputbuffer.len;	541	end = outputbuffer.start + outputbuffer.len;
310	/* The buffer is already in a wrapped state, so adjust end */	542	/* The buffer is already in a wrapped state, so adjust end */
311	if (end >= SOCKETBUFSIZE)	543	if (end >= SOCKETBUFSIZE)
312	end -= SOCKETBUFSIZE;	544	end -= SOCKETBUFSIZE;
		545
313	avail = SOCKETBUFSIZE - end;	546	avail = SOCKETBUFSIZE - end;
314		547
315	/* We can all fit it behind the current data without wrapping */	548	/* We can all fit it behind the current data without wrapping */
316	if (avail >= len)	549	if (avail >= len)
317	{
318	memcpy (ns->outputbuffer.data + end, buf, len);	550	memcpy (outputbuffer.data + end, buf, len);
319	}
320	else	551	else
321	{	552	{
322	memcpy (ns->outputbuffer.data + end, buf, avail);	553	memcpy (outputbuffer.data + end, buf, avail);
323	memcpy (ns->outputbuffer.data, buf + avail, len - avail);	554	memcpy (outputbuffer.data, buf + avail, len - avail);
324	}	555	}
		556
325	ns->outputbuffer.len += len;	557	outputbuffer.len += len;
326	#if 0
327	LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
328	#endif
329	}	558	}
330
331	/**
332	* Writes data to socket.
333	*
334	* When the socket is clear to write, and we have backlogged data, this
335	* is called to write it out.
336	*/
337	void
338	write_socket_buffer (NewSocket * ns)
339	{
340	int amt, max;
341
342	if (ns->outputbuffer.len == 0)
343	{
344	LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
345	return;
346	}
347
348	do
349	{
350	max = SOCKETBUFSIZE - ns->outputbuffer.start;
351	if (ns->outputbuffer.len < max)
352	max = ns->outputbuffer.len;
353
354	#ifdef WIN32 /* **win32 write_socket_buffer: change write() to send() /
355	amt = send (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max, 0);
356	#else
357	do
358	{
359	amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
360	}
361	while ((amt < 0) && (errno == EINTR));
362	#endif
363
364	if (amt < 0)
365	{ /* We got an error */
366
367	#ifdef WIN32 /* **win32 write_socket_buffer: change error handling /
368	if (amt == -1 && WSAGetLastError () != WSAEWOULDBLOCK)
369	{
370	LOG (llevError, "New socket write failed (wsb) (%d).\n", WSAGetLastError ());
371	#else
372	if (errno != EWOULDBLOCK)
373	{
374	LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
375	#endif
376	ns->status = Ns_Dead;
377	return;
378	}
379	else
380	{ /* EWOULDBLOCK */
381	/* can't write it, so store it away. */
382	ns->can_write = 0;
383	return;
384	}
385	}
386	ns->outputbuffer.start += amt;
387	/* wrap back to start of buffer */
388	if (ns->outputbuffer.start == SOCKETBUFSIZE)
389	ns->outputbuffer.start = 0;
390	ns->outputbuffer.len -= amt;
391	#ifdef CS_LOGSTATS
392	cst_tot.obytes += amt;
393	cst_lst.obytes += amt;
394	#endif
395	}
396	while (ns->outputbuffer.len > 0);
397	}
398
399	/**
400	* This writes data to the socket. - It is very low level -
401	* all we try and do is write out the data to the socket
402	* provided (ns). buf is the data to write, len is the number
403	* of bytes to write. IT doesn't return anything - rather, it
404	* updates the ns structure if we get an error.
405	*/
406	void
407	Write_To_Socket (NewSocket * ns, char *buf, int len)
408	{
409	int amt = 0;
410	char *pos = buf;
411
412	if (ns->status == Ns_Dead \|\| !buf)
413	{
414	LOG (llevDebug, "Write_To_Socket called with dead socket\n");
415	return;
416	}
417
418	#ifndef __GNU__ /* This caused problems on Hurd */
419	if (!ns->can_write)
420	{
421	add_to_buffer (ns, buf, len);
422	return;
423	}
424	#endif
425	/* If we manage to write more than we wanted, take it as a bonus */
426	while (len > 0)
427	{
428
429	#ifdef WIN32 /* **win32 Write_To_Socket: change write() to send() /
430	amt = send (ns->fd, pos, len, 0);
431	#else
432	do
433	{
434	amt = write (ns->fd, pos, len);
435	}
436	while ((amt < 0) && (errno == EINTR));
437	#endif
438
439	if (amt < 0)
440	{ /* We got an error */
441	#ifdef WIN32 /* **win32 Write_To_Socket: change error handling /
442	if (amt == -1 && WSAGetLastError () != WSAEWOULDBLOCK)
443	{
444	LOG (llevError, "New socket write failed WTS (%d).\n", WSAGetLastError ());
445	#else
446	if (errno != EWOULDBLOCK)
447	{
448	LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
449	errno, strerror (errno));
450	#endif
451	ns->status = Ns_Dead;
452	return;
453	}
454	else
455	{ /* EWOULDBLOCK */
456	/* can't write it, so store it away. */
457	add_to_buffer (ns, pos, len);
458	ns->can_write = 0;
459	return;
460	}
461	}
462	/* amt gets set to 0 above in blocking code, so we do this as
463	* an else if to make sure we don't reprocess it.
464	*/
465	else if (amt == 0)
466	{
467	LOG (llevError, "Write_To_Socket: No data written out.\n");
468	}
469	len -= amt;
470	pos += amt;
471	#ifdef CS_LOGSTATS
472	cst_tot.obytes += amt;
473	cst_lst.obytes += amt;
474	#endif
475	}
476	}
477
478		559
479	/**	560	/**
480	* Takes a string of data, and writes it out to the socket. A very handy	561	* Takes a string of data, and writes it out to the socket. A very handy
481	* shortcut function.	562	* shortcut function.
482	*/	563	*/
483	void	564	void
484	cs_write_string (NewSocket * ns, const char *buf, int len)	565	client::send_packet (packet &sl)
485	{	566	{
486	SockList sl;	567	if (destroyed ())
487
488	sl.len = len;
489	sl.buf = (unsigned char *) buf;
490	Send_With_Handling (ns, &sl);
491	}
492
493
494	/**
495	* Calls Write_To_Socket to send data to the client.
496	*
497	* The only difference in this function is that we take a SockList
498	*, and we prepend the length information.
499	*/
500	void
501	Send_With_Handling (NewSocket * ns, SockList * msg)
502	{
503	unsigned char sbuf[4];
504
505	if (ns->status == Ns_Dead \|\| !msg)
506	return;	568	return;
507		569
508	if (msg->len >= MAXSOCKBUF)	570	if (sl.length () > MAXSOCKBUF)
509	{	571	{
510	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len);	572	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
511	/* Almost certainly we've overflowed a buffer, so quite now to make	573	/* Almost certainly we've overflowed a buffer, so quit now to make
512	* it easier to debug.	574	* it easier to debug.
513	*/	575	*/
514	abort ();	576	abort ();
515	}	577	}
516	sbuf[0] = ((uint32) (msg->len) >> 8) & 0xFF;
517	sbuf[1] = ((uint32) (msg->len)) & 0xFF;
518	if (ns->status != Ns_Old)
519	Write_To_Socket (ns, (char *) sbuf, 2);
520	Write_To_Socket (ns, (char *) msg->buf, msg->len);
521	}
522		578
523	/**	579	if (!sl.length ())
524	* Takes a string of data, and writes it out to the socket. A very handy
525	* shortcut function.
526	*/
527	void
528	Write_String_To_Socket (NewSocket * ns, char *buf, int len)
529	{
530	SockList sl;
531
532	sl.len = len;
533	sl.buf = (unsigned char *) buf;
534	Send_With_Handling (ns, &sl);
535	}
536
537
538	/******************************************************************************
539	*
540	* statistics logging functions.
541	*
542	******************************************************************************/
543
544	#ifdef CS_LOGSTATS
545
546	/* cst_tot is for the life of the server, cst_last is for the last series of
547	* stats
548	*/
549	CS_Stats cst_tot, cst_lst;
550
551	/**
552	* Writes out the gathered stats. We clear cst_lst.
553	*/
554	void
555	write_cs_stats (void)
556	{
557	time_t now = time (NULL);
558
559	/* If no connections recently, don't both to log anything */
560	if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
561	return;	580	return;
562		581
563	/* CSSTAT is put in so scripts can easily find the line */	582	if (ws_version == 8)
564	LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",	583	{
565	ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,	584	static uint8 buf [MAXSOCKBUF * 2 + 4];
566	now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);	585
567	cst_lst.ibytes = 0;	586	uint8 *b = buf + 4;
568	cst_lst.obytes = 0;	587	for (uint8 *a = sl.buf_ + sl.hdrlen; a < sl.cur; ++a)
569	cst_lst.max_conn = socket_info.nconns;	588	{
570	cst_lst.time_start = now;	589	if (*a < 0x80)
		590	b++ = a;
		591	else
		592	{
		593	b++ = 0xc0 \| ((a >> 6) & 0x1f);
		594	b++ = 0x80 \| ( a & 0x3f);
		595	}
		596	}
		597
		598	assert (b - buf < sizeof (buf));
		599
		600	int len = b - (buf + 4);
		601
		602	if (len < 126)
		603	{
		604	buf [2] = 0x81;
		605	buf [3] = len;
		606
		607	send (buf + 2, len + 2);
		608	}
		609	else
		610	{
		611	buf [0] = 0x81;
		612	buf [1] = 126;
		613	buf [2] = len >> 8;
		614	buf [3] = len;
		615
		616	send (buf, len + 4);
		617	}
		618	}
		619	else if (ws_version == 13)
		620	{
		621	int len = sl.length ();
		622
		623	if (len < 126)
		624	{
		625	uint8 hdr [] = { 0x82, len };
		626	send (hdr, sizeof (hdr));
		627	}
		628	else
		629	{
		630	uint8 hdr [] = { 0x82, 126, len >> 8, len };
		631	send (hdr, sizeof (hdr));
		632	}
		633
		634	send (sl.buf_ + sl.hdrlen, len);
		635	}
		636	else
		637	{
		638	assert (sl.hdrlen == 2);
		639
		640	sl.buf_ [0] = sl.length () >> 8;
		641	sl.buf_ [1] = sl.length () ;
		642
		643	send (sl.buf_, sl.length () + sl.hdrlen);
		644	}
571	}	645	}
572	#endif	646
		647	void
		648	client::send_packet (const char *buf, int len)
		649	{
		650	packet sl;
		651
		652	sl << data_n (buf, len);
		653	send_packet (sl);
		654	}
		655
		656	void
		657	client::send_packet (const char *buf)
		658	{
		659	send_packet (buf, strlen (buf));
		660	}
		661
		662	void
		663	client::send_packet_printf (const char *format, ...)
		664	{
		665	packet sl;
		666
		667	va_list ap;
		668	va_start (ap, format);
		669	sl.vprintf (format, ap);
		670	va_end (ap);
		671
		672	send_packet (sl);
		673	}
		674
		675	void
		676	client::send_msg (int color, const char type, const char msg)
		677	{
		678	if (!msg \|\| !type) // it can happen (for example, missing attack messages cause this)
		679	{
		680	LOG (logBacktrace \| llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
		681	return;
		682	}
		683
		684	int len = strlen (msg);
		685
		686	if (!(color & NDI_VERBATIM)
		687	&& (msg_is_special (msg)
		688	\|\| (type [0] == 'c' && type [1] == '/') \|\| len > (MAXSOCKBUF - 128)))
		689	cfperl_send_msg (this, color, type, msg);
		690	else
		691	send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
		692	}
		693
		694	/***********************************************************************
		695	*
		696	* packet functions/utilities
		697	*
		698	**********************************************************************/
		699
		700	packet::packet (const char *name)
		701	{
		702	reset ();
		703
		704	int len = strlen (name);
		705	memcpy (cur, name, len); cur += len;
		706	*cur++ = ' ';
		707	}
		708
		709	packet &packet::operator <<(const ber32 v)
		710	{
		711	enum { maxlen = 32 / 7 + 1 };
		712	uint8 buf[maxlen];
		713	uint8 *p = buf + maxlen;
		714	uint32 val = v.val;
		715
		716	*--p = val & 0x7F;
		717
		718	while (val > 0x7F)
		719	{
		720	val >>= 7;
		721	*--p = (val & 0x7F) \| 0x80;
		722	}
		723
		724	return *this << data_n (p, buf + maxlen - p);
		725	}
		726
		727	packet &packet::operator <<(const data_n &v)
		728	{
		729	if (room () < v.len)
		730	reset ();
		731	else
		732	{
		733	if (v.len)
		734	{
		735	memcpy (cur, v.ptr, v.len);
		736	cur += v.len;
		737	}
		738	}
		739
		740	return *this;
		741	}
		742
		743	packet &packet::operator <<(const data8 &v)
		744	{
		745	unsigned int len = min (v.len, 0x00FF);
		746	return *this << uint8 (len) << data_n (v.ptr, len);
		747	}
		748
		749	packet &packet::operator <<(const data16 &v)
		750	{
		751	unsigned int len = min (v.len, 0xFFFF);
		752	return *this << uint16 (len) << data_n (v.ptr, len);
		753	}
		754
		755	packet &packet::operator <<(const char *v)
		756	{
		757	return *this << data_n (v, v ? strlen (v) : 0);
		758	}
		759
		760	void
		761	packet::vprintf (const char *format, va_list ap)
		762	{
		763	int size = room ();
		764
		765	int len = vsnprintf ((char *)cur, size, format, ap);
		766
		767	if (len >= size)
		768	return reset ();
		769
		770	cur += len;
		771	}
		772

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Comparing deliantra/server/socket/lowlevel.C (file contents): Revision 1.6 by root, Thu Sep 14 22:34:06 2006 UTC vs. Revision 1.100 by root, Wed Nov 14 23:24:27 2018 UTC

Diff Legend

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.6 by root, Thu Sep 14 22:34:06 2006 UTC vs.
Revision 1.100 by root, Wed Nov 14 23:24:27 2018 UTC