server/socket/init.C

/*
 * This file is part of Crossfire TRT, the Roguelike Realtime MORPG.
 * 
 * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team
 * Copyright (©) 2001,2007 Mark Wedel
 * Copyright (©) 1992,2007 Frank Tore Johansen
 * 
 * Crossfire TRT is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 * 
 * The authors can be reached via e-mail to <crossfire@schmorp.de>
 */

/**
 * \file
 * Socket general functions
 *
 * \date 2003-12-02
 *
 * Mainly deals with initialization and higher level socket
 * maintenance (checking for lost connections and if data has arrived.)
 * The reading of data is handled in ericserver.c
 */

#include <global.h>
#include <sproto.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netinet/ip.h>
#include <netdb.h>

#include <unistd.h>
#include <arpa/inet.h>

#include <algorithm>

// use relatively small values, as we do not expect to receive much,
// and we do userspace write buffering
// 8kb limits throughput to roughly 66kb/s
#define SOCKET_RCVBUF  8192
#define SOCKET_SNDBUF 16384

sockvec clients;

/**
 * Initializes a connection. Really, it just sets up the data structure,
 * socket setup is handled elsewhere.  We do send a version to the
 * client.
 */
client::client (int fd, const char *peername)
: fd (fd), host (strdup (peername)),
  socket_ev (this, &client::socket_cb),
  cmd_ev    (this, &client::cmd_cb)
{
  refcnt_inc (); // the socket is an external reference

  mss = 1500 - 52; // 1500 typical ethernet frame, 66 typical tcp header overhead

  {
    struct linger linger_opt;

    linger_opt.l_onoff  = 0;
    linger_opt.l_linger = 0;

    if (setsockopt (fd, SOL_SOCKET, SO_LINGER, &linger_opt, sizeof (struct linger)))
      LOG (llevError, "SO_LINGER: %s\n", strerror (errno));
  }

  {
    int val;

#ifdef SO_RCVBUF
    val = SOCKET_RCVBUF;
    if (setsockopt (fd, SOL_SOCKET, SO_RCVBUF, &val, sizeof (val)))
      LOG (llevError, "SO_RCVBUF: %s\n", strerror (errno));
#endif

#ifdef SO_SNDBUF
    val = SOCKET_SNDBUF;
    if (setsockopt (fd, SOL_SOCKET, SO_SNDBUF, &val, sizeof (val)))
      LOG (llevError, "SO_SNDBUF: %s\n", strerror (errno));
#endif

#ifdef IP_TOS
    val = IPTOS_LOWDELAY;
    if (setsockopt (fd, IPPROTO_IP, IP_TOS, &val, sizeof (val)))
      LOG (llevError, "IP_TOS: %s\n", strerror (errno));
#endif

#ifdef TCP_NODELAY
    val = 1;
    if (setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof (val)))
      LOG (llevError, "TCP_NODELAY: %s\n", strerror (errno));
#endif

    // set some very aggressive keepalive parameters
#ifdef TCP_KEEPIDLE
    val = 1;
    if (setsockopt (fd, IPPROTO_TCP, TCP_KEEPIDLE, &val, sizeof (val)))
      LOG (llevError, "TCP_KEEPIDLE: %s\n", strerror (errno));
#endif

#ifdef TCP_KEEPCNT
    val = 3;
    if (setsockopt (fd, IPPROTO_TCP, TCP_KEEPCNT, &val, sizeof (val)))
      LOG (llevError, "TCP_KEEPCNT: %s\n", strerror (errno));
#endif

#ifdef TCP_KEEPINTVL
    val = 1;
    if (setsockopt (fd, IPPROTO_TCP, TCP_KEEPINTVL, &val, sizeof (val)))
      LOG (llevError, "TCP_KEEPINTVL: %s\n", strerror (errno));
#endif

    // try to find the mss value in use
#ifdef TCP_MAXSEG
    socklen_t sl = sizeof (val);
    if (!getsockopt (fd, IPPROTO_TCP, TCP_MAXSEG, &val, &sl) && sl == sizeof (val))
      mss = val;
#endif
  }

  {
    int bufsize = 65535;          /*Supposed absolute upper limit */
    int oldbufsize;
    int buflen = sizeof (int);

    if (fcntl (fd, F_SETFL, O_NONBLOCK) == -1)
      LOG (llevError, "InitConnection:  Error on fcntl.\n");

    if (getsockopt (fd, SOL_SOCKET, SO_SNDBUF, (char *) &oldbufsize, (socklen_t *) & buflen) == -1)
      oldbufsize = 0;

    if (oldbufsize < bufsize)
      if (setsockopt (fd, SOL_SOCKET, SO_SNDBUF, (char *) &bufsize, sizeof (&bufsize)))
        LOG (llevError, "InitConnection: setsockopt unable to set output buf size to %d\n", bufsize);

    buflen = sizeof (oldbufsize);
    getsockopt (fd, SOL_SOCKET, SO_SNDBUF, (char *) &oldbufsize, (socklen_t *) & buflen);
  }

  state = ST_SETUP;
  mapmode = Map0Cmd;
  darkness = 1;
  mapx = 11;
  mapy = 11;
  itemcmd = 1;              /* Default is version item1 command */
  max_rate = 100000 / (1000000 / MAX_TIME); // ~1mbit is assumed per default

  /* Do this so we don't send a face command for the client for
   * this face.  Face 0 is sent to the client to say clear
   * face information.
   */
  faces_sent[0] = true;
  fx_want [FT_FACE] = true; // all clients must support image faces

  socket_ev.prio (PE_PRIO_NORMAL);
  socket_ev.fd (fd);
  socket_ev.poll (PE_R);

  cmd_ev.prio (PE_PRIO_NORMAL);

  // initialisation done, kick it!
  send_packet_printf ("version %d %d %s\n", VERSION_CS, VERSION_SC, VERSION_INFO);
  flush ();

  reset_stats ();

  clients.insert (this);
}

client::~client ()
{
  clients.erase (this);

  mapinfo_queue_clear ();
  free (stats.range);
  free (stats.title);
  free (host);
}

void
client::do_destroy ()
{
  attachable::do_destroy ();

  if (pl)
    pl->disconnect ();

  if (fd >= 0)
    {
      send_packet ("goodbye");
      flush ();

      close (fd);
    }

  state = ST_DEAD;

  socket_ev.suspend ();
  cmd_ev.suspend ();

  refcnt_dec (); // socket no longer open
}

void
client::reset_stats ()
{
  /* we need to clear these to -1 and not zero - otherwise,
   * if a player quits and starts a new character, we wont
   * send new values to the client, as things like exp start
   * at zero.
   */
  for (int i = 0; i < NUM_SKILLS; i++)
    last_skill_exp[i] = -1;

  for (int i = 0; i < NROFATTACKS; i++)
    last_resist[i] = -1;

  last_weapon_sp = -1;
  last_level = -1;
  last_stats.exp = -1;
  last_weight = (uint32) - 1;
  last_flags = 0;
  last_weight = 0;
  last_weight_limit = 0;
  last_path_attuned = 0;
  last_path_repelled = 0;
  last_path_denied = 0;
  last_speed = 0;
  last_flags = 0;

  static living zero_living;
  last_stats = zero_living;
}

client *
client::create (int fd, const char *peername)
{
  client *ns = new client (dup (fd), peername);
  ns->instantiate (); // effectively a nop right now
  INVOKE_CLIENT (CONNECT, ns);
  return ns;
}

Revision:	1.51
Committed:	Fri Aug 24 00:26:10 2007 UTC (16 years, 9 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-2_2
Changes since 1.50:	+1 -0 lines
Log Message:	major changes: - on_same_map and related functions now do not block on map loads, instead they pretend the map is not there. this ensures lag-free operation, but changes semantics considerably: running quickly over the worldmap often lets you bump into map borders until the map has been loaded. also, rabies takes longer to nuke a full continent now. - mapinfo (a major sync blocker) is now fully asynchronous, and works by quieing all mapinfo requests and retrying them on every tick until satisfed.
#	User	Rev	Content
1	elmex	1.1	/*
2	root	1.49	* This file is part of Crossfire TRT, the Roguelike Realtime MORPG.
3	pippijn	1.36	*
4	root	1.46	* Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team
5			* Copyright (©) 2001,2007 Mark Wedel
6			* Copyright (©) 1992,2007 Frank Tore Johansen
7	pippijn	1.36	*
8	root	1.49	* Crossfire TRT is free software: you can redistribute it and/or modify
9			* it under the terms of the GNU General Public License as published by
10			* the Free Software Foundation, either version 3 of the License, or
11			* (at your option) any later version.
12	pippijn	1.36	*
13	root	1.49	* This program is distributed in the hope that it will be useful,
14			* but WITHOUT ANY WARRANTY; without even the implied warranty of
15			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16			* GNU General Public License for more details.
17	pippijn	1.36	*
18	root	1.49	* You should have received a copy of the GNU General Public License
19			* along with this program. If not, see <http://www.gnu.org/licenses/>.
20	root	1.46	*
21			* The authors can be reached via e-mail to <crossfire@schmorp.de>
22	pippijn	1.36	*/
23	elmex	1.1
24			/**
25			* \file
26			* Socket general functions
27			*
28			* \date 2003-12-02
29			*
30			* Mainly deals with initialization and higher level socket
31			* maintenance (checking for lost connections and if data has arrived.)
32			* The reading of data is handled in ericserver.c
33			*/
34
35			#include <global.h>
36	root	1.11	#include <sproto.h>
37	pippijn	1.10	#include <sys/types.h>
38			#include <sys/time.h>
39			#include <sys/socket.h>
40			#include <netinet/in.h>
41	root	1.23	#include <netinet/tcp.h>
42			#include <netinet/ip.h>
43	pippijn	1.10	#include <netdb.h>
44	elmex	1.1
45	root	1.19	#include <unistd.h>
46			#include <arpa/inet.h>
47	elmex	1.1
48	root	1.31	#include <algorithm>
49
50	root	1.48	// use relatively small values, as we do not expect to receive much,
51			// and we do userspace write buffering
52			// 8kb limits throughput to roughly 66kb/s
53			#define SOCKET_RCVBUF 8192
54			#define SOCKET_SNDBUF 16384
55
56	root	1.20	sockvec clients;
57	elmex	1.1
58			/**
59			* Initializes a connection. Really, it just sets up the data structure,
60			* socket setup is handled elsewhere. We do send a version to the
61			* client.
62			*/
63	root	1.20	client::client (int fd, const char *peername)
64	root	1.17	: fd (fd), host (strdup (peername)),
65	root	1.21	socket_ev (this, &client::socket_cb),
66	root	1.44	cmd_ev (this, &client::cmd_cb)
67	elmex	1.1	{
68	root	1.34	refcnt_inc (); // the socket is an external reference
69
70	root	1.43	mss = 1500 - 52; // 1500 typical ethernet frame, 66 typical tcp header overhead
71	root	1.42
72	root	1.16	{
73			struct linger linger_opt;
74
75	root	1.44	linger_opt.l_onoff = 0;
76	root	1.16	linger_opt.l_linger = 0;
77
78			if (setsockopt (fd, SOL_SOCKET, SO_LINGER, &linger_opt, sizeof (struct linger)))
79	root	1.23	LOG (llevError, "SO_LINGER: %s\n", strerror (errno));
80	root	1.16	}
81
82			{
83	root	1.42	int val;
84	root	1.23
85	root	1.48	#ifdef SO_RCVBUF
86			val = SOCKET_RCVBUF;
87			if (setsockopt (fd, SOL_SOCKET, SO_RCVBUF, &val, sizeof (val)))
88			LOG (llevError, "SO_RCVBUF: %s\n", strerror (errno));
89			#endif
90
91			#ifdef SO_SNDBUF
92			val = SOCKET_SNDBUF;
93			if (setsockopt (fd, SOL_SOCKET, SO_SNDBUF, &val, sizeof (val)))
94			LOG (llevError, "SO_SNDBUF: %s\n", strerror (errno));
95			#endif
96
97	root	1.42	#ifdef IP_TOS
98			val = IPTOS_LOWDELAY;
99	root	1.23	if (setsockopt (fd, IPPROTO_IP, IP_TOS, &val, sizeof (val)))
100			LOG (llevError, "IP_TOS: %s\n", strerror (errno));
101	root	1.42	#endif
102	root	1.23
103	root	1.42	#ifdef TCP_NODELAY
104			val = 1;
105	root	1.23	if (setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof (val)))
106			LOG (llevError, "TCP_NODELAY: %s\n", strerror (errno));
107	root	1.42	#endif
108
109			// set some very aggressive keepalive parameters
110			#ifdef TCP_KEEPIDLE
111	root	1.44	val = 1;
112	root	1.42	if (setsockopt (fd, IPPROTO_TCP, TCP_KEEPIDLE, &val, sizeof (val)))
113			LOG (llevError, "TCP_KEEPIDLE: %s\n", strerror (errno));
114			#endif
115
116			#ifdef TCP_KEEPCNT
117	root	1.44	val = 3;
118	root	1.42	if (setsockopt (fd, IPPROTO_TCP, TCP_KEEPCNT, &val, sizeof (val)))
119			LOG (llevError, "TCP_KEEPCNT: %s\n", strerror (errno));
120			#endif
121	root	1.23
122	root	1.42	#ifdef TCP_KEEPINTVL
123			val = 1;
124			if (setsockopt (fd, IPPROTO_TCP, TCP_KEEPINTVL, &val, sizeof (val)))
125			LOG (llevError, "TCP_KEEPINTVL: %s\n", strerror (errno));
126			#endif
127	root	1.23
128	root	1.42	// try to find the mss value in use
129			#ifdef TCP_MAXSEG
130			socklen_t sl = sizeof (val);
131			if (!getsockopt (fd, IPPROTO_TCP, TCP_MAXSEG, &val, &sl) && sl == sizeof (val))
132			mss = val;
133			#endif
134	root	1.23	}
135
136			{
137	root	1.16	int bufsize = 65535; /Supposed absolute upper limit /
138			int oldbufsize;
139			int buflen = sizeof (int);
140
141			if (fcntl (fd, F_SETFL, O_NONBLOCK) == -1)
142			LOG (llevError, "InitConnection: Error on fcntl.\n");
143
144			if (getsockopt (fd, SOL_SOCKET, SO_SNDBUF, (char ) &oldbufsize, (socklen_t ) & buflen) == -1)
145			oldbufsize = 0;
146
147			if (oldbufsize < bufsize)
148			if (setsockopt (fd, SOL_SOCKET, SO_SNDBUF, (char *) &bufsize, sizeof (&bufsize)))
149			LOG (llevError, "InitConnection: setsockopt unable to set output buf size to %d\n", bufsize);
150
151			buflen = sizeof (oldbufsize);
152			getsockopt (fd, SOL_SOCKET, SO_SNDBUF, (char ) &oldbufsize, (socklen_t ) & buflen);
153			}
154	elmex	1.1
155	root	1.28	state = ST_SETUP;
156	root	1.15	mapmode = Map0Cmd;
157			darkness = 1;
158			mapx = 11;
159			mapy = 11;
160			itemcmd = 1; /* Default is version item1 command */
161	root	1.41	max_rate = 100000 / (1000000 / MAX_TIME); // ~1mbit is assumed per default
162	root	1.12
163	root	1.7	/* Do this so we don't send a face command for the client for
164			* this face. Face 0 is sent to the client to say clear
165			* face information.
166			*/
167	root	1.40	faces_sent[0] = true;
168	root	1.50	fx_want [FT_FACE] = true; // all clients must support image faces
169	root	1.7
170	root	1.37	socket_ev.prio (PE_PRIO_NORMAL);
171	root	1.18	socket_ev.fd (fd);
172	root	1.21	socket_ev.poll (PE_R);
173
174	root	1.37	cmd_ev.prio (PE_PRIO_NORMAL);
175	root	1.15
176	root	1.16	// initialisation done, kick it!
177	root	1.21	send_packet_printf ("version %d %d %s\n", VERSION_CS, VERSION_SC, VERSION_INFO);
178			flush ();
179	root	1.13
180	root	1.35	reset_stats ();
181
182	root	1.34	clients.insert (this);
183	elmex	1.1	}
184
185	root	1.20	client::~client ()
186	root	1.16	{
187	root	1.34	clients.erase (this);
188	root	1.32
189	root	1.51	mapinfo_queue_clear ();
190	root	1.22	free (stats.range);
191			free (stats.title);
192			free (host);
193	root	1.21	}
194
195			void
196	root	1.31	client::do_destroy ()
197	root	1.21	{
198	root	1.31	attachable::do_destroy ();
199
200			if (pl)
201			pl->disconnect ();
202
203			if (fd >= 0)
204	root	1.34	{
205			send_packet ("goodbye");
206			flush ();
207
208			close (fd);
209			}
210	root	1.29
211	root	1.28	state = ST_DEAD;
212	root	1.27
213	root	1.21	socket_ev.suspend ();
214			cmd_ev.suspend ();
215	root	1.31
216	root	1.34	refcnt_dec (); // socket no longer open
217	root	1.16	}
218	elmex	1.1
219	root	1.35	void
220			client::reset_stats ()
221			{
222			/* we need to clear these to -1 and not zero - otherwise,
223			* if a player quits and starts a new character, we wont
224			* send new values to the client, as things like exp start
225			* at zero.
226			*/
227			for (int i = 0; i < NUM_SKILLS; i++)
228			last_skill_exp[i] = -1;
229
230			for (int i = 0; i < NROFATTACKS; i++)
231			last_resist[i] = -1;
232
233			last_weapon_sp = -1;
234			last_level = -1;
235			last_stats.exp = -1;
236			last_weight = (uint32) - 1;
237			last_flags = 0;
238			last_weight = 0;
239			last_weight_limit = 0;
240			last_path_attuned = 0;
241			last_path_repelled = 0;
242			last_path_denied = 0;
243			last_speed = 0;
244	root	1.45	last_flags = 0;
245	root	1.35
246			static living zero_living;
247			last_stats = zero_living;
248			}
249
250	root	1.27	client *
251			client::create (int fd, const char *peername)
252	root	1.16	{
253	root	1.38	client *ns = new client (dup (fd), peername);
254			ns->instantiate (); // effectively a nop right now
255			INVOKE_CLIENT (CONNECT, ns);
256			return ns;
257	root	1.16	}
258