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),
  cc_inv (this), cc_other (this)
{
  refcnt_inc (); // the socket is an external reference

  {
    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 = IPTOS_LOWDELAY;

    if (setsockopt (fd, IPPROTO_IP, IP_TOS, &val, sizeof (val)))
      LOG (llevError, "IP_TOS: %s\n", strerror (errno));
  }

  {
    int val = 1;

    if (setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof (val)))
      LOG (llevError, "TCP_NODELAY: %s\n", strerror (errno));
  }

#ifdef __linux__
  {
     int val;

     // set some very aggressive keepalive parameters
     val = 10;
     if (setsockopt (fd, IPPROTO_TCP, TCP_KEEPIDLE, &val, sizeof (val)))
       LOG (llevError, "TCP_KEEPIDLE: %s\n", strerror (errno));

     val = 5;
     if (setsockopt (fd, IPPROTO_TCP, TCP_KEEPCNT, &val, sizeof (val)))
       LOG (llevError, "TCP_KEEPCNT: %s\n", strerror (errno));

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

  faces_sent = salloc0<uint8> (nrofpixmaps);

  /* 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] = NS_FACESENT_FACE;

  // socket I/O is low priority
  // we prefer to have the server run instead of handling client requests
  socket_ev.prio (PE_PRIO_NORMAL + 1);
  socket_ev.fd (fd);
  socket_ev.poll (PE_R);

  // command handling is even lower priority
  // that way no client can monopolise the server
  cmd_ev.prio (PE_PRIO_NORMAL + 2);

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

  clients.insert (this);
}

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

  sfree<uint8> (faces_sent, nrofpixmaps);
  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
}

/** 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");

  read_client_images ();
}


/*******************************************************************************
 *
 * 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)
{
  if (checkbanned (NULL, peername))
    {
      LOG (llevInfo, "Banned host tried to connect: [%s]\n", peername);
      return 0;
    }
  else
    {
      client *ns = new client (dup (fd), peername);

      ns->instantiate (); // effectively a nop right now

      INVOKE_CLIENT (CONNECT, ns);

      return ns;
    }
}

Revision:	1.34
Committed:	Sun Jan 7 02:39:15 2007 UTC (17 years, 5 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.33:	+11 -15 lines
Log Message:	""
#	User	Rev	Content
1	elmex	1.1	/*
2			CrossFire, A Multiplayer game for X-windows
3
4	pippijn	1.33	Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team
5	elmex	1.1	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	root	1.8	The author can be reached via e-mail to <crossfire@schmorp.de>
23	elmex	1.1	*/
24
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	1.26	cmd_ev (this, &client::cmd_cb),
62			cc_inv (this), cc_other (this)
63	elmex	1.1	{
64	root	1.34	refcnt_inc (); // the socket is an external reference
65
66	root	1.16	{
67			struct linger linger_opt;
68
69			linger_opt.l_onoff = 0;
70			linger_opt.l_linger = 0;
71
72			if (setsockopt (fd, SOL_SOCKET, SO_LINGER, &linger_opt, sizeof (struct linger)))
73	root	1.23	LOG (llevError, "SO_LINGER: %s\n", strerror (errno));
74	root	1.16	}
75
76			{
77	root	1.23	int val = IPTOS_LOWDELAY;
78
79			if (setsockopt (fd, IPPROTO_IP, IP_TOS, &val, sizeof (val)))
80			LOG (llevError, "IP_TOS: %s\n", strerror (errno));
81			}
82
83			{
84			int val = 1;
85
86			if (setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof (val)))
87			LOG (llevError, "TCP_NODELAY: %s\n", strerror (errno));
88			}
89
90			#ifdef __linux__
91			{
92			int val;
93
94			// set some very aggressive keepalive parameters
95			val = 10;
96			if (setsockopt (fd, IPPROTO_TCP, TCP_KEEPIDLE, &val, sizeof (val)))
97			LOG (llevError, "TCP_KEEPIDLE: %s\n", strerror (errno));
98
99			val = 5;
100			if (setsockopt (fd, IPPROTO_TCP, TCP_KEEPCNT, &val, sizeof (val)))
101			LOG (llevError, "TCP_KEEPCNT: %s\n", strerror (errno));
102
103			val = 1;
104			if (setsockopt (fd, IPPROTO_TCP, TCP_KEEPINTVL, &val, sizeof (val)))
105			LOG (llevError, "TCP_KEEPINTVL: %s\n", strerror (errno));
106			}
107			#endif
108
109			{
110	root	1.16	int bufsize = 65535; /Supposed absolute upper limit /
111			int oldbufsize;
112			int buflen = sizeof (int);
113
114			if (fcntl (fd, F_SETFL, O_NONBLOCK) == -1)
115			LOG (llevError, "InitConnection: Error on fcntl.\n");
116
117			if (getsockopt (fd, SOL_SOCKET, SO_SNDBUF, (char ) &oldbufsize, (socklen_t ) & buflen) == -1)
118			oldbufsize = 0;
119
120			if (oldbufsize < bufsize)
121			if (setsockopt (fd, SOL_SOCKET, SO_SNDBUF, (char *) &bufsize, sizeof (&bufsize)))
122			LOG (llevError, "InitConnection: setsockopt unable to set output buf size to %d\n", bufsize);
123
124			buflen = sizeof (oldbufsize);
125			getsockopt (fd, SOL_SOCKET, SO_SNDBUF, (char ) &oldbufsize, (socklen_t ) & buflen);
126			}
127	elmex	1.1
128	root	1.28	state = ST_SETUP;
129	root	1.15	mapmode = Map0Cmd;
130			darkness = 1;
131			mapx = 11;
132			mapy = 11;
133			itemcmd = 1; /* Default is version item1 command */
134	root	1.12
135	root	1.27	faces_sent = salloc0<uint8> (nrofpixmaps);
136	root	1.16
137	root	1.7	/* Do this so we don't send a face command for the client for
138			* this face. Face 0 is sent to the client to say clear
139			* face information.
140			*/
141	root	1.15	faces_sent[0] = NS_FACESENT_FACE;
142	root	1.7
143	root	1.21	// socket I/O is low priority
144			// we prefer to have the server run instead of handling client requests
145			socket_ev.prio (PE_PRIO_NORMAL + 1);
146	root	1.18	socket_ev.fd (fd);
147	root	1.21	socket_ev.poll (PE_R);
148
149			// command handling is even lower priority
150			// that way no client can monopolise the server
151			cmd_ev.prio (PE_PRIO_NORMAL + 2);
152	root	1.15
153	root	1.16	// initialisation done, kick it!
154	root	1.21	send_packet_printf ("version %d %d %s\n", VERSION_CS, VERSION_SC, VERSION_INFO);
155			flush ();
156	root	1.13
157	root	1.34	clients.insert (this);
158	elmex	1.1	}
159
160	root	1.20	client::~client ()
161	root	1.16	{
162	root	1.34	clients.erase (this);
163	root	1.32
164	root	1.25	sfree<uint8> (faces_sent, nrofpixmaps);
165	root	1.22	free (stats.range);
166			free (stats.title);
167			free (host);
168	root	1.21	}
169
170			void
171	root	1.31	client::do_destroy ()
172	root	1.21	{
173	root	1.31	attachable::do_destroy ();
174
175			if (pl)
176			pl->disconnect ();
177
178			if (fd >= 0)
179	root	1.34	{
180			send_packet ("goodbye");
181			flush ();
182
183			close (fd);
184			}
185	root	1.29
186	root	1.28	state = ST_DEAD;
187	root	1.27
188	root	1.21	socket_ev.suspend ();
189			cmd_ev.suspend ();
190	root	1.31
191	root	1.34	refcnt_dec (); // socket no longer open
192	root	1.16	}
193	elmex	1.1
194			/** This sets up the socket and reads all the image information into memory. */
195	root	1.7	void
196			init_ericserver (void)
197	elmex	1.1	{
198	root	1.7	cst_tot.time_start = time (NULL);
199			cst_lst.time_start = time (NULL);
200	elmex	1.1
201	root	1.7	LOG (llevDebug, "Initialize new client/server data\n");
202	root	1.11
203	root	1.7	read_client_images ();
204	elmex	1.1	}
205
206
207			/*******************************************************************************
208			*
209			* Start of functions dealing with freeing of the data.
210			*
211			******************************************************************************/
212
213			/** Free's all the memory that ericserver allocates. */
214	root	1.7	void
215			free_all_newserver (void)
216			{
217			LOG (llevDebug, "Freeing all new client/server information.\n");
218			free_socket_images ();
219	elmex	1.1	}
220
221	root	1.27	client *
222			client::create (int fd, const char *peername)
223	root	1.16	{
224			if (checkbanned (NULL, peername))
225			{
226			LOG (llevInfo, "Banned host tried to connect: [%s]\n", peername);
227	root	1.27	return 0;
228	root	1.16	}
229			else
230			{
231	root	1.20	client *ns = new client (dup (fd), peername);
232	root	1.27
233			ns->instantiate (); // effectively a nop right now
234
235			INVOKE_CLIENT (CONNECT, ns);
236
237			return ns;
238	root	1.16	}
239			}
240