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

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.3 by root, Tue Aug 29 08:01:38 2006 UTC vs.
Revision 1.102 by root, Wed Dec 5 19:03:27 2018 UTC

…		…
1
2	/*	1	/*
3	* static char *rcsid_sockets_c =	2	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
4	* "$Id: lowlevel.C,v 1.3 2006/08/29 08:01:38 root Exp $";	3	*
		4	* Copyright (©) 2018 Marc Alexander Lehmann / the Deliantra team
		5	* Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
		6	*
		7	* Deliantra is free software: you can redistribute it and/or modify it under
		8	* the terms of the Affero GNU General Public License as published by the
		9	* Free Software Foundation, either version 3 of the License, or (at your
		10	* 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 Affero GNU General Public License
		18	* and the GNU General Public License along with this program. If not, see
		19	* <http://www.gnu.org/licenses/>.
		20	*
		21	* The authors can be reached via e-mail to <support@deliantra.net>
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	/**
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;
42
43	#include <global.h>	24	#include <global.h>
44	#include <newclient.h>
45	#include <sproto.h>	25	#include <sproto.h>
		26	#include <cstdarg>
46		27
47	#ifdef __linux__	28	#if HAVE_TCP_INFO
48	# include <sys/types.h>	29	# include <sys/types.h>
49	# include <sys/socket.h>	30	# include <sys/socket.h>
50	# include <netinet/in.h>	31	# include <netinet/in.h>
51	# define TCP_HZ 1000 // sorry...
52	# include <netinet/tcp.h>	32	# include <netinet/tcp.h>
53	#endif	33	#endif
54		34
55	// use a really low timeout, as it doesn't cost any bandwidth, and you can	35	using namespace std;
56	// easily die in 20 seconds...
57	#define SOCKET_TIMEOUT1 10
58	#define SOCKET_TIMEOUT2 20
59		36
60	void Socket_Flush (NewSocket *ns)	37	// force a packet when idle for more than this many seconds,
61	{	38	// forcing an ack regularly.
62	#ifdef __linux__	39	#define IDLE_PING 2.
63	// check time of last ack, and, if too old, kill connection
64	struct tcp_info tcpi;
65	socklen_t len = sizeof (tcpi);
66		40
67	if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))	41	void
68	{	42	client::flush ()
69	unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;	43	{
		44	if (destroyed ())
		45	return;
70		46
71	if (tcpi.tcpi_unacked	47	/**
72	&& SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s	48	* Writes data to socket.
73	&& SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s	49	*
74	{	50	* When the socket is clear to write, and we have backlogged data, this
75	LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd,	51	* is called to write it out.
76	(unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);	52	*/
77	ns->status = Ns_Dead;	53
		54	// write a nop to the socket at least every IDLE_PING seconds.
		55	if (!outputbuffer.len)
		56	{
		57	if (last_send + IDLE_PING <= NOW && pl && pl->active)
78	}	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)
79	}	79	{
		80	int res = write (fd, outputbuffer.data + outputbuffer.start,
		81	min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
80		82
81	int val;	83	if (res > 0)
82	val = 0; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));	84	{
83	val = 1; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));	85	outputbuffer.start += res;
84	#endif	86	/* wrap back to start of buffer */
85	}	87	if (outputbuffer.start == SOCKETBUFSIZE)
		88	outputbuffer.start = 0;
86		89
		90	outputbuffer.len -= res;
		91	}
		92	else if (res == 0)
		93	{
		94	LOG (llevError, "socket write failed, connection closed.\n");
		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	}
		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
87	/***********************************************************************	154	/*****************************************************************************
88	*	155	* Start of command dispatch area.
89	* SockList functions/utilities	156	* The commands here are protocol commands.
90	*
91	**********************************************************************/	157	****************************************************************************/
92		158
93	void SockList_Init(SockList *sl)	159	// SocketCommand, PlayingCommand, should not exist with those ugly casts
94	{	160	#define SC(cb) (void )static_cast<void ()(char , int, client )>(cb),
95	sl->len=0;	161	#define PC(cb) (void )static_cast<void ()(char , int, player )>(cb), PF_PLAYER \|
96	sl->buf=NULL;
97	}
98		162
99	void SockList_AddInt(SockList *sl, uint32 data)	163	static void
		164	NopCmd (char , int, client )
100	{	165	{
101	sl->buf[sl->len++]= (data>>24)&0xff;	166	// do nothing
102	sl->buf[sl->len++]= (data>>16)&0xff;
103	sl->buf[sl->len++]= (data>>8)&0xff;
104	sl->buf[sl->len++] = data & 0xff;
105	}	167	}
106		168
107	void SockList_AddInt64(SockList *sl, uint64 data)	169	/**
108	{	170	* Dispatch table for the server.
109	sl->buf[sl->len++]= ( char )( (data>>56)&0xff );
110	sl->buf[sl->len++]= ( char )( (data>>48)&0xff );
111	sl->buf[sl->len++]= ( char )( (data>>40)&0xff );
112	sl->buf[sl->len++]= ( char )( (data>>32)&0xff );
113
114	sl->buf[sl->len++]= ( char )( (data>>24)&0xff );
115	sl->buf[sl->len++]= ( char )( (data>>16)&0xff );
116	sl->buf[sl->len++]= ( char )( (data>>8)&0xff );
117	sl->buf[sl->len++] =( char )( data & 0xff );
118	}
119
120	/* Basically does the reverse of SockList_AddInt, but on
121	* strings instead. Same for the GetShort, but for 16 bits.
122	*/	171	*/
123	int GetInt_String(unsigned char *data)	172	static struct packet_type packets[] = {
124	{	173	{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND },
125	return ((data[0]<<24) + (data[1]<<16) + (data[2]<<8) + data[3]);
126	}
127		174
128	short GetShort_String(unsigned char *data) {	175	{"examine", PC(ExamineCmd) PF_PLAYING },
129	return ((data[0]<<8)+data[1]);	176	{"ex", PC(ExCmd) PF_PLAYING },
130	}	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
131		185
132	/******************************************************************************	186	{"reply", SC(ReplyCmd) 0 },
133	*	187	{"exti", SC(ExtiCmd) 0 }, // CF+/Deliantra
134	* Start of read routines.	188	{"addme", SC(AddMeCmd) 0 },
135	*	189	{"askface", SC(AskFaceCmd) 0 },
136	******************************************************************************/	190	{"requestinfo", SC(RequestInfo) 0 },
		191	{"setsound", SC(SetSound) 0 },
		192	{"setup", SC(SetUp) 0 },
		193	{"version", SC(VersionCmd) 0 },
137		194
138	/**	195	{"toggleextendedtext", SC(NopCmd) 0 }, // deliantra: disabled
139	* This reads from fd and puts the data in sl. We return true if we think	196	};
140	* we have a full packet, 0 if we have a partial packet. The only processing
141	* we do is remove the intial size value. len (As passed) is the size of the
142	* buffer allocated in the socklist. We make the assumption the buffer is
143	* at least 2 bytes long.
144	*/
145
146	int SockList_ReadPacket(int fd, SockList *sl, int len)
147	{
148	int stat,toread;
149		197
150	/* Sanity check - shouldn't happen */	198	bool
151	if (sl->len < 0) {	199	client::may_execute (const packet_type *pkt) const
152	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_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))
153	}	234	{
154	/* We already have a partial packet */	235	//TODO: only one format
155	if (sl->len<2) {	236	if (pkt->flags & PF_PLAYER)
156	#ifdef WIN32 /* **WIN32 SockList_ReadPacket: change read() to recv() /
157
158	stat=recv(fd, sl->buf + sl->len, 2-sl->len,0);
159
160	#else
161	do {	237	{
162	stat=read(fd, sl->buf + sl->len, 2-sl->len);	238	((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
163	} while ((stat==-1) && (errno==EINTR));	239	pl->need_updated_stats ();
164	#endif	240	}
165	if (stat<0) {	241	else
166	/* In non blocking mode, EAGAIN is set when there is no	242	((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
167	* data available.	243	}
		244	else
		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 + ecb_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)
168	*/	377	{
169	#ifdef WIN32 /* **WIN32 SockList_ReadPacket: error handling for win32 /	378	LOG (llevError, "read error: %s\n", strerror (errno));
170	if ((stat==-1) && WSAGetLastError() !=WSAEWOULDBLOCK) {	379	destroy ();
171	if(WSAGetLastError() == WSAECONNRESET)	380	return;
172	LOG(llevDebug,"Connection closed by client\n");	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
173	else	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)
174	{	401	{
175	LOG(llevDebug,"ReadPacket got error %d, returning 0\n",WSAGetLastError());	402	len = (ws_inbuf [2] << 8) \| ws_inbuf [3];
		403	d += 2;
176	}	404	}
177	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	}
178	}	497	}
179	#else
180	if (errno != EAGAIN && errno !=EWOULDBLOCK) {
181	LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno));
182	}	498	}
183	#endif	499	else
184	return 0; /Error /
185	}	500	{
186	if (stat==0) return -1;	501	inbuf_len += amount;
187	sl->len += stat;	502	inbuf_handle ();
188	#ifdef CS_LOGSTATS
189	cst_tot.ibytes += stat;
190	cst_lst.ibytes += stat;
191	#endif
192	if (stat<2) return 0; /* Still don't have a full packet */
193	}
194	/* Figure out how much more data we need to read. Add 2 from the
195	* end of this - size header information is not included.
196	*/
197	toread = 2+(sl->buf[0] << 8) + sl->buf[1] - sl->len;
198	if ((toread + sl->len) >= len) {
199	LOG(llevError,"SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n",
200	toread + sl->len, len);
201	/* Quick hack in case for 'oldsocketmode' input. If we are
202	* closing the socket anyways, then reading this extra 100 bytes
203	* shouldn't hurt.
204	*/
205	#ifdef WIN32 /* **win32 SockList_ReadPacket: change read() to recv() /
206	recv(fd, sl->buf+2, 100, 0);
207	#else
208	read(fd, sl->buf+2, 100);
209	#endif /* end win32 */
210
211	/* return error so the socket is closed */
212	return -1;
213	}
214	do {
215	#ifdef WIN32 /* **win32 SockList_ReadPacket: change read() to recv() /
216	stat = recv(fd, sl->buf+ sl->len, toread, 0);
217	#else
218	do {
219	stat = read(fd, sl->buf+ sl->len, toread);
220	} while ((stat<0) && (errno==EINTR));
221	#endif
222	if (stat<0) {
223
224	#ifdef WIN32 /* **win32 SockList_ReadPacket: change error handling for win32 /
225	if ((stat==-1) && WSAGetLastError() !=WSAEWOULDBLOCK) {
226	if(WSAGetLastError() == WSAECONNRESET)
227	LOG(llevDebug,"Connection closed by client\n");
228	else
229	{
230	LOG(llevDebug,"ReadPacket got error %d, returning 0\n",WSAGetLastError());
231	}
232	return -1; /* kick this user! */
233	}	503	}
234	#else	504	}
235	if (errno != EAGAIN && errno !=EWOULDBLOCK) {
236	LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno));
237	}
238	#endif
239	return 0; /Error /
240	}
241	if (stat==0) return -1;
242	sl->len += stat;
243	#ifdef CS_LOGSTATS
244	cst_tot.ibytes += stat;
245	cst_lst.ibytes += stat;
246	#endif
247	toread -= stat;
248	if (toread==0) return 1;
249	if (toread < 0) {
250	LOG(llevError,"SockList_ReadPacket: Read more bytes than desired.\n");
251	return 1;
252	}
253	} while (toread>0);
254	return 0;
255	}	505	}
256		506
257	/*******************************************************************************	507	/*******************************************************************************
258	*	508	*
259	* Start of write related routines.	509	* Start of write related routines.
264	* Adds data to a socket buffer for whatever reason.	514	* Adds data to a socket buffer for whatever reason.
265	*	515	*
266	* 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
267	* data, and len is the number of bytes to add.	517	* data, and len is the number of bytes to add.
268	*/	518	*/
269		519	void
270	static void add_to_buffer(NewSocket ns, char buf, int len)	520	client::send (void *buf_, int len)
271	{	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
272	int avail, end;	536	int avail, end;
273		537
274	if ((len+ns->outputbuffer.len)>SOCKETBUFSIZE) {
275	LOG(llevDebug,"Socket on fd %d has overrun internal buffer - marking as dead\n",
276	ns->fd);
277	ns->status = Ns_Dead;
278	return;
279	}
280
281	/* data + end is where we start putting the new data. The last byte	538	/* data + end is where we start putting the new data. The last byte
282	* currently in use is actually data + end -1	539	* currently in use is actually data + end -1
283	*/	540	*/
284
285	end=ns->outputbuffer.start + ns->outputbuffer.len;	541	end = outputbuffer.start + outputbuffer.len;
286	/* The buffer is already in a wrapped state, so adjust end */	542	/* The buffer is already in a wrapped state, so adjust end */
287	if (end>=SOCKETBUFSIZE) end-=SOCKETBUFSIZE;	543	if (end >= SOCKETBUFSIZE)
		544	end -= SOCKETBUFSIZE;
		545
288	avail=SOCKETBUFSIZE - end;	546	avail = SOCKETBUFSIZE - end;
289		547
290	/* We can all fit it behind the current data without wrapping */	548	/* We can all fit it behind the current data without wrapping */
291	if (avail >=len ) {	549	if (avail >= len)
292	memcpy(ns->outputbuffer.data + end, buf, len);	550	memcpy (outputbuffer.data + end, buf, len);
		551	else
293	}	552	{
294	else {
295	memcpy(ns->outputbuffer.data + end, buf, avail);	553	memcpy (outputbuffer.data + end, buf, avail);
296	memcpy(ns->outputbuffer.data, buf+avail, len-avail);	554	memcpy (outputbuffer.data, buf + avail, len - avail);
297	}	555	}
		556
298	ns->outputbuffer.len += len;	557	outputbuffer.len += len;
299	#if 0
300	LOG(llevDebug,"Added %d to output buffer, total length now %d, start=%d\n", len,
301	ns->outputbuffer.len, ns->outputbuffer.start);
302	#endif
303	}	558	}
304
305	/**
306	* Writes data to socket.
307	*
308	* When the socket is clear to write, and we have backlogged data, this
309	* is called to write it out.
310	*/
311	void write_socket_buffer(NewSocket *ns)
312	{
313	int amt, max;
314
315	if (ns->outputbuffer.len==0) {
316	LOG(llevDebug,"write_socket_buffer called when there is no data, fd=%d\n",
317	ns->fd);
318	return;
319	}
320
321	do {
322	max = SOCKETBUFSIZE - ns->outputbuffer.start;
323	if (ns->outputbuffer.len<max) max = ns->outputbuffer.len;
324
325	#ifdef WIN32 /* **win32 write_socket_buffer: change write() to send() /
326	amt=send(ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max,0);
327	#else
328	do {
329	amt=write(ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
330	} while ((amt<0) && (errno==EINTR));
331	#endif
332
333	if (amt < 0) { /* We got an error */
334
335	#ifdef WIN32 /* **win32 write_socket_buffer: change error handling /
336	if (amt == -1 && WSAGetLastError() !=WSAEWOULDBLOCK) {
337	LOG(llevError,"New socket write failed (wsb) (%d).\n", WSAGetLastError());
338	#else
339	if (errno !=EWOULDBLOCK) {
340	LOG(llevError,"New socket write failed (wsb) (%d: %s).\n",
341	errno, strerror_local(errno));
342	#endif
343	ns->status=Ns_Dead;
344	return;
345	}
346	else { /* EWOULDBLOCK */
347	/* can't write it, so store it away. */
348	ns->can_write=0;
349	return;
350	}
351	}
352	ns->outputbuffer.start += amt;
353	/* wrap back to start of buffer */
354	if (ns->outputbuffer.start==SOCKETBUFSIZE) ns->outputbuffer.start=0;
355	ns->outputbuffer.len -= amt;
356	#ifdef CS_LOGSTATS
357	cst_tot.obytes += amt;
358	cst_lst.obytes += amt;
359	#endif
360	} while (ns->outputbuffer.len>0);
361	}
362
363	/**
364	* This writes data to the socket. - It is very low level -
365	* all we try and do is write out the data to the socket
366	* provided (ns). buf is the data to write, len is the number
367	* of bytes to write. IT doesn't return anything - rather, it
368	* updates the ns structure if we get an error.
369	*/
370	void Write_To_Socket(NewSocket ns, char buf, int len)
371	{
372	int amt=0;
373	char *pos=buf;
374
375	if (ns->status == Ns_Dead \|\| !buf) {
376	LOG(llevDebug,"Write_To_Socket called with dead socket\n");
377	return;
378	}
379
380	#ifndef __GNU__ /* This caused problems on Hurd */
381	if (!ns->can_write) {
382	add_to_buffer(ns, buf, len);
383	return;
384	}
385	#endif
386	/* If we manage to write more than we wanted, take it as a bonus */
387	while (len>0) {
388
389	#ifdef WIN32 /* **win32 Write_To_Socket: change write() to send() /
390	amt=send(ns->fd, pos, len,0);
391	#else
392	do {
393	amt=write(ns->fd, pos, len);
394	} while ((amt<0) && (errno==EINTR));
395	#endif
396
397	if (amt < 0) { /* We got an error */
398	#ifdef WIN32 /* **win32 Write_To_Socket: change error handling /
399	if (amt == -1 && WSAGetLastError() !=WSAEWOULDBLOCK) {
400	LOG(llevError,"New socket write failed WTS (%d).\n",WSAGetLastError());
401	#else
402	if (errno !=EWOULDBLOCK) {
403	LOG(llevError,"New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
404	errno, strerror_local(errno));
405	#endif
406	ns->status=Ns_Dead;
407	return;
408	}
409	else { /* EWOULDBLOCK */
410	/* can't write it, so store it away. */
411	add_to_buffer(ns, pos, len);
412	ns->can_write=0;
413	return;
414	}
415	}
416	/* amt gets set to 0 above in blocking code, so we do this as
417	* an else if to make sure we don't reprocess it.
418	*/
419	else if (amt==0) {
420	LOG(llevError,"Write_To_Socket: No data written out.\n");
421	}
422	len -= amt;
423	pos += amt;
424	#ifdef CS_LOGSTATS
425	cst_tot.obytes += amt;
426	cst_lst.obytes += amt;
427	#endif
428	}
429	}
430
431		559
432	/**	560	/**
433	* 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
434	* shortcut function.	562	* shortcut function.
435	*/	563	*/
436	void cs_write_string(NewSocket ns, const char buf, int len)	564	void
		565	client::send_packet (packet &sl)
437	{	566	{
438	SockList sl;	567	if (destroyed ())
439
440	sl.len = len;
441	sl.buf = (unsigned char*)buf;
442	Send_With_Handling(ns, &sl);
443	}
444
445
446	/**
447	* Calls Write_To_Socket to send data to the client.
448	*
449	* The only difference in this function is that we take a SockList
450	*, and we prepend the length information.
451	*/
452	void Send_With_Handling(NewSocket ns,SockList msg)
453	{
454	unsigned char sbuf[4];
455
456	if (ns->status == Ns_Dead \|\| !msg)
457	return;	568	return;
458		569
459	if (msg->len >= MAXSOCKBUF) {	570	if (sl.length () > MAXSOCKBUF)
		571	{
460	LOG(llevError,"Trying to send a buffer beyond properly size, len =%d\n",	572	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
461	msg->len);
462	/* Almost certainly we've overflowed a buffer, so quite now to make	573	/* Almost certainly we've overflowed a buffer, so quit now to make
463	* it easier to debug.	574	* it easier to debug.
464	*/	575	*/
465	abort();	576	abort ();
		577	}
		578
		579	if (!sl.length ())
		580	return;
		581
		582	if (ws_version == 8)
466	}	583	{
467	sbuf[0] = ((uint32)(msg->len) >> 8) & 0xFF;	584	static uint8 buf [MAXSOCKBUF * 2 + 4];
468	sbuf[1] = ((uint32)(msg->len)) & 0xFF;
469	if (ns->status != Ns_Old)
470	Write_To_Socket(ns, (char *) sbuf, 2);
471	Write_To_Socket(ns, (char*)msg->buf, msg->len);
472	}
473		585
474	/**	586	uint8 *b = buf + 4;
475	* Takes a string of data, and writes it out to the socket. A very handy	587	for (uint8 *a = sl.buf_ + sl.hdrlen; a < sl.cur; ++a)
476	* shortcut function.	588	{
477	*/	589	if (*a < 0x80)
478	void Write_String_To_Socket(NewSocket ns, char buf, int len)	590	b++ = a;
479	{	591	else
480	SockList sl;	592	{
		593	b++ = 0xc0 \| ((a >> 6) & 0x1f);
		594	b++ = 0x80 \| ( a & 0x3f);
		595	}
		596	}
481		597
482	sl.len = len;	598	assert (b - buf < sizeof (buf));
483	sl.buf = (unsigned char*) buf;
484	Send_With_Handling(ns, &sl);
485	}
486		599
		600	int len = b - (buf + 4);
487		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	}
		645	}
		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
488	/******************************************************************************	694	/***********************************************************************
489	*	695	*
490	* statistics logging functions.	696	* packet functions/utilities
491	*	697	*
492	******************************************************************************/	698	**********************************************************************/
493		699
494	#ifdef CS_LOGSTATS	700	packet::packet (const char *name)
495	/* cst_tot is for the life of the server, cst_last is for the last series of
496	* stats
497	*/
498	CS_Stats cst_tot, cst_lst;
499
500	/**
501	* Writes out the gathered stats. We clear cst_lst.
502	*/
503	void write_cs_stats(void)
504	{	701	{
505	time_t now=time(NULL);	702	reset ();
506		703
507	/* If no connections recently, don't both to log anything */	704	int len = strlen (name);
508	if (cst_lst.ibytes==0 && cst_lst.obytes==0) return;	705	memcpy (cur, name, len); cur += len;
509		706	*cur++ = ' ';
510	/* CSSTAT is put in so scripts can easily find the line */
511	LOG(llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
512	ctime(&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
513	now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes,
514	cst_lst.max_conn, now - cst_lst.time_start);
515	cst_lst.ibytes=0;
516	cst_lst.obytes=0;
517	cst_lst.max_conn=socket_info.nconns;
518	cst_lst.time_start=now;
519	}	707	}
520	#endif	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

Diff Legend

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

Comparing deliantra/server/socket/lowlevel.C (file contents): Revision 1.3 by root, Tue Aug 29 08:01:38 2006 UTC vs. Revision 1.102 by root, Wed Dec 5 19:03:27 2018 UTC

Diff Legend

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.3 by root, Tue Aug 29 08:01:38 2006 UTC vs.
Revision 1.102 by root, Wed Dec 5 19:03:27 2018 UTC