server/socket/init.C

/*
 * CrossFire, A Multiplayer game for X-windows
 * 
 * Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team
 * Copyright (C) 2001 Mark Wedel
 * Copyright (C) 1992 Frank Tore Johansen
 * 
 * This program 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 2 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, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * The author 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>

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 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;

  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);

  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;
  flags = 0;

  static living zero_living;
  last_stats = zero_living;
}

/** This sets up the socket and reads all the image information into memory. */
void
init_ericserver (void)
{
  cst_tot.time_start = time (NULL);
  cst_lst.time_start = time (NULL);

  LOG (llevDebug, "Initialize new client/server data\n");
}


/*******************************************************************************
 *
 * Start of functions dealing with freeing of the data.
 *
 ******************************************************************************/

/** Free's all the memory that ericserver allocates. */
void
free_all_newserver (void)
{
  LOG (llevDebug, "Freeing all new client/server information.\n");
  free_socket_images ();
}

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:	1.44
Committed:	Fri Apr 27 02:43:04 2007 UTC (17 years ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.43:	+4 -5 lines
Log Message:	very very aggressive tcp keepalive - tghis might time out connections in 4 seconds
#	User	Rev	Content
1	elmex	1.1	/*
2	pippijn	1.36	* CrossFire, A Multiplayer game for X-windows
3			*
4			* Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team
5			* Copyright (C) 2001 Mark Wedel
6			* Copyright (C) 1992 Frank Tore Johansen
7			*
8			* This program 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 2 of the License, or
11			* (at your option) any later version.
12			*
13			* 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			*
18			* You should have received a copy of the GNU General Public License
19			* along with this program; if not, write to the Free Software
20			* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21			*
22			* The author can be reached via e-mail to <crossfire@schmorp.de>
23			*/
24	elmex	1.1
25			/**
26			* \file
27			* Socket general functions
28			*
29			* \date 2003-12-02
30			*
31			* Mainly deals with initialization and higher level socket
32			* maintenance (checking for lost connections and if data has arrived.)
33			* The reading of data is handled in ericserver.c
34			*/
35
36			#include <global.h>
37	root	1.11	#include <sproto.h>
38	pippijn	1.10	#include <sys/types.h>
39			#include <sys/time.h>
40			#include <sys/socket.h>
41			#include <netinet/in.h>
42	root	1.23	#include <netinet/tcp.h>
43			#include <netinet/ip.h>
44	pippijn	1.10	#include <netdb.h>
45	elmex	1.1
46	root	1.19	#include <unistd.h>
47			#include <arpa/inet.h>
48	elmex	1.1
49	root	1.31	#include <algorithm>
50
51	root	1.20	sockvec clients;
52	elmex	1.1
53			/**
54			* Initializes a connection. Really, it just sets up the data structure,
55			* socket setup is handled elsewhere. We do send a version to the
56			* client.
57			*/
58	root	1.20	client::client (int fd, const char *peername)
59	root	1.17	: fd (fd), host (strdup (peername)),
60	root	1.21	socket_ev (this, &client::socket_cb),
61	root	1.44	cmd_ev (this, &client::cmd_cb)
62	elmex	1.1	{
63	root	1.34	refcnt_inc (); // the socket is an external reference
64
65	root	1.43	mss = 1500 - 52; // 1500 typical ethernet frame, 66 typical tcp header overhead
66	root	1.42
67	root	1.16	{
68			struct linger linger_opt;
69
70	root	1.44	linger_opt.l_onoff = 0;
71	root	1.16	linger_opt.l_linger = 0;
72
73			if (setsockopt (fd, SOL_SOCKET, SO_LINGER, &linger_opt, sizeof (struct linger)))
74	root	1.23	LOG (llevError, "SO_LINGER: %s\n", strerror (errno));
75	root	1.16	}
76
77			{
78	root	1.42	int val;
79	root	1.23
80	root	1.42	#ifdef IP_TOS
81			val = IPTOS_LOWDELAY;
82	root	1.23	if (setsockopt (fd, IPPROTO_IP, IP_TOS, &val, sizeof (val)))
83			LOG (llevError, "IP_TOS: %s\n", strerror (errno));
84	root	1.42	#endif
85	root	1.23
86	root	1.42	#ifdef TCP_NODELAY
87			val = 1;
88	root	1.23	if (setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof (val)))
89			LOG (llevError, "TCP_NODELAY: %s\n", strerror (errno));
90	root	1.42	#endif
91
92			// set some very aggressive keepalive parameters
93			#ifdef TCP_KEEPIDLE
94	root	1.44	val = 1;
95	root	1.42	if (setsockopt (fd, IPPROTO_TCP, TCP_KEEPIDLE, &val, sizeof (val)))
96			LOG (llevError, "TCP_KEEPIDLE: %s\n", strerror (errno));
97			#endif
98
99			#ifdef TCP_KEEPCNT
100	root	1.44	val = 3;
101	root	1.42	if (setsockopt (fd, IPPROTO_TCP, TCP_KEEPCNT, &val, sizeof (val)))
102			LOG (llevError, "TCP_KEEPCNT: %s\n", strerror (errno));
103			#endif
104	root	1.23
105	root	1.42	#ifdef TCP_KEEPINTVL
106			val = 1;
107			if (setsockopt (fd, IPPROTO_TCP, TCP_KEEPINTVL, &val, sizeof (val)))
108			LOG (llevError, "TCP_KEEPINTVL: %s\n", strerror (errno));
109			#endif
110	root	1.23
111	root	1.42	// try to find the mss value in use
112			#ifdef TCP_MAXSEG
113			socklen_t sl = sizeof (val);
114			if (!getsockopt (fd, IPPROTO_TCP, TCP_MAXSEG, &val, &sl) && sl == sizeof (val))
115			mss = val;
116			#endif
117	root	1.23	}
118
119			{
120	root	1.16	int bufsize = 65535; /Supposed absolute upper limit /
121			int oldbufsize;
122			int buflen = sizeof (int);
123
124			if (fcntl (fd, F_SETFL, O_NONBLOCK) == -1)
125			LOG (llevError, "InitConnection: Error on fcntl.\n");
126
127			if (getsockopt (fd, SOL_SOCKET, SO_SNDBUF, (char ) &oldbufsize, (socklen_t ) & buflen) == -1)
128			oldbufsize = 0;
129
130			if (oldbufsize < bufsize)
131			if (setsockopt (fd, SOL_SOCKET, SO_SNDBUF, (char *) &bufsize, sizeof (&bufsize)))
132			LOG (llevError, "InitConnection: setsockopt unable to set output buf size to %d\n", bufsize);
133
134			buflen = sizeof (oldbufsize);
135			getsockopt (fd, SOL_SOCKET, SO_SNDBUF, (char ) &oldbufsize, (socklen_t ) & buflen);
136			}
137	elmex	1.1
138	root	1.28	state = ST_SETUP;
139	root	1.15	mapmode = Map0Cmd;
140			darkness = 1;
141			mapx = 11;
142			mapy = 11;
143			itemcmd = 1; /* Default is version item1 command */
144	root	1.41	max_rate = 100000 / (1000000 / MAX_TIME); // ~1mbit is assumed per default
145	root	1.12
146	root	1.7	/* Do this so we don't send a face command for the client for
147			* this face. Face 0 is sent to the client to say clear
148			* face information.
149			*/
150	root	1.40	faces_sent[0] = true;
151	root	1.7
152	root	1.37	socket_ev.prio (PE_PRIO_NORMAL);
153	root	1.18	socket_ev.fd (fd);
154	root	1.21	socket_ev.poll (PE_R);
155
156	root	1.37	cmd_ev.prio (PE_PRIO_NORMAL);
157	root	1.15
158	root	1.16	// initialisation done, kick it!
159	root	1.21	send_packet_printf ("version %d %d %s\n", VERSION_CS, VERSION_SC, VERSION_INFO);
160			flush ();
161	root	1.13
162	root	1.35	reset_stats ();
163
164	root	1.34	clients.insert (this);
165	elmex	1.1	}
166
167	root	1.20	client::~client ()
168	root	1.16	{
169	root	1.34	clients.erase (this);
170	root	1.32
171	root	1.22	free (stats.range);
172			free (stats.title);
173			free (host);
174	root	1.21	}
175
176			void
177	root	1.31	client::do_destroy ()
178	root	1.21	{
179	root	1.31	attachable::do_destroy ();
180
181			if (pl)
182			pl->disconnect ();
183
184			if (fd >= 0)
185	root	1.34	{
186			send_packet ("goodbye");
187			flush ();
188
189			close (fd);
190			}
191	root	1.29
192	root	1.28	state = ST_DEAD;
193	root	1.27
194	root	1.21	socket_ev.suspend ();
195			cmd_ev.suspend ();
196	root	1.31
197	root	1.34	refcnt_dec (); // socket no longer open
198	root	1.16	}
199	elmex	1.1
200	root	1.35	void
201			client::reset_stats ()
202			{
203			/* we need to clear these to -1 and not zero - otherwise,
204			* if a player quits and starts a new character, we wont
205			* send new values to the client, as things like exp start
206			* at zero.
207			*/
208			for (int i = 0; i < NUM_SKILLS; i++)
209			last_skill_exp[i] = -1;
210
211			for (int i = 0; i < NROFATTACKS; i++)
212			last_resist[i] = -1;
213
214			last_weapon_sp = -1;
215			last_level = -1;
216			last_stats.exp = -1;
217			last_weight = (uint32) - 1;
218			last_flags = 0;
219			last_weight = 0;
220			last_weight_limit = 0;
221			last_path_attuned = 0;
222			last_path_repelled = 0;
223			last_path_denied = 0;
224			last_speed = 0;
225			flags = 0;
226
227			static living zero_living;
228			last_stats = zero_living;
229			}
230
231	elmex	1.1	/** This sets up the socket and reads all the image information into memory. */
232	root	1.7	void
233			init_ericserver (void)
234	elmex	1.1	{
235	root	1.7	cst_tot.time_start = time (NULL);
236			cst_lst.time_start = time (NULL);
237	elmex	1.1
238	root	1.7	LOG (llevDebug, "Initialize new client/server data\n");
239	elmex	1.1	}
240
241
242			/*******************************************************************************
243			*
244			* Start of functions dealing with freeing of the data.
245			*
246			******************************************************************************/
247
248			/** Free's all the memory that ericserver allocates. */
249	root	1.7	void
250			free_all_newserver (void)
251			{
252			LOG (llevDebug, "Freeing all new client/server information.\n");
253			free_socket_images ();
254	elmex	1.1	}
255
256	root	1.27	client *
257			client::create (int fd, const char *peername)
258	root	1.16	{
259	root	1.38	client *ns = new client (dup (fd), peername);
260			ns->instantiate (); // effectively a nop right now
261			INVOKE_CLIENT (CONNECT, ns);
262			return ns;
263	root	1.16	}
264