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)
{
  {
    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 are externally referenced by the socket
  refcnt_inc ();
  clients.push_back (this);

#if 0//TODO
  socket_info.nconns++;
  if (socket_info.nconns > cst_tot.max_conn) cst_tot.max_conn = socket_info.nconns;
  if (socket_info.nconns > cst_lst.max_conn) cst_lst.max_conn = socket_info.nconns;
#endif
}

client::~client ()
{
  sockvec::iterator i = find (clients.begin (), clients.end (), this);
  if (i != clients.end ())
    clients.erase (i);

  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)
    close (fd);

  state = ST_DEAD;

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

  // socket now longer references us
  refcnt_dec ();
}

/** 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:	1.33
Committed:	Sat Jan 6 14:42:31 2007 UTC (17 years, 5 months ago) by pippijn
Content type:	text/plain
Branch:	MAIN
Changes since 1.32:	+1 -0 lines
Log Message:	added some copyrights
#	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	1.16	{
65			struct linger linger_opt;
66
67			linger_opt.l_onoff = 0;
68			linger_opt.l_linger = 0;
69
70			if (setsockopt (fd, SOL_SOCKET, SO_LINGER, &linger_opt, sizeof (struct linger)))
71	root	1.23	LOG (llevError, "SO_LINGER: %s\n", strerror (errno));
72	root	1.16	}
73
74			{
75	root	1.23	int val = IPTOS_LOWDELAY;
76
77			if (setsockopt (fd, IPPROTO_IP, IP_TOS, &val, sizeof (val)))
78			LOG (llevError, "IP_TOS: %s\n", strerror (errno));
79			}
80
81			{
82			int val = 1;
83
84			if (setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof (val)))
85			LOG (llevError, "TCP_NODELAY: %s\n", strerror (errno));
86			}
87
88			#ifdef __linux__
89			{
90			int val;
91
92			// set some very aggressive keepalive parameters
93			val = 10;
94			if (setsockopt (fd, IPPROTO_TCP, TCP_KEEPIDLE, &val, sizeof (val)))
95			LOG (llevError, "TCP_KEEPIDLE: %s\n", strerror (errno));
96
97			val = 5;
98			if (setsockopt (fd, IPPROTO_TCP, TCP_KEEPCNT, &val, sizeof (val)))
99			LOG (llevError, "TCP_KEEPCNT: %s\n", strerror (errno));
100
101			val = 1;
102			if (setsockopt (fd, IPPROTO_TCP, TCP_KEEPINTVL, &val, sizeof (val)))
103			LOG (llevError, "TCP_KEEPINTVL: %s\n", strerror (errno));
104			}
105			#endif
106
107			{
108	root	1.16	int bufsize = 65535; /Supposed absolute upper limit /
109			int oldbufsize;
110			int buflen = sizeof (int);
111
112			if (fcntl (fd, F_SETFL, O_NONBLOCK) == -1)
113			LOG (llevError, "InitConnection: Error on fcntl.\n");
114
115			if (getsockopt (fd, SOL_SOCKET, SO_SNDBUF, (char ) &oldbufsize, (socklen_t ) & buflen) == -1)
116			oldbufsize = 0;
117
118			if (oldbufsize < bufsize)
119			if (setsockopt (fd, SOL_SOCKET, SO_SNDBUF, (char *) &bufsize, sizeof (&bufsize)))
120			LOG (llevError, "InitConnection: setsockopt unable to set output buf size to %d\n", bufsize);
121
122			buflen = sizeof (oldbufsize);
123			getsockopt (fd, SOL_SOCKET, SO_SNDBUF, (char ) &oldbufsize, (socklen_t ) & buflen);
124			}
125	elmex	1.1
126	root	1.28	state = ST_SETUP;
127	root	1.15	mapmode = Map0Cmd;
128			darkness = 1;
129			mapx = 11;
130			mapy = 11;
131			itemcmd = 1; /* Default is version item1 command */
132	root	1.12
133	root	1.27	faces_sent = salloc0<uint8> (nrofpixmaps);
134	root	1.16
135	root	1.7	/* Do this so we don't send a face command for the client for
136			* this face. Face 0 is sent to the client to say clear
137			* face information.
138			*/
139	root	1.15	faces_sent[0] = NS_FACESENT_FACE;
140	root	1.7
141	root	1.21	// socket I/O is low priority
142			// we prefer to have the server run instead of handling client requests
143			socket_ev.prio (PE_PRIO_NORMAL + 1);
144	root	1.18	socket_ev.fd (fd);
145	root	1.21	socket_ev.poll (PE_R);
146
147			// command handling is even lower priority
148			// that way no client can monopolise the server
149			cmd_ev.prio (PE_PRIO_NORMAL + 2);
150	root	1.15
151	root	1.16	// initialisation done, kick it!
152	root	1.21	send_packet_printf ("version %d %d %s\n", VERSION_CS, VERSION_SC, VERSION_INFO);
153			flush ();
154	root	1.13
155	root	1.31	// clients are externally referenced by the socket
156			refcnt_inc ();
157			clients.push_back (this);
158
159	root	1.16	#if 0//TODO
160			socket_info.nconns++;
161			if (socket_info.nconns > cst_tot.max_conn) cst_tot.max_conn = socket_info.nconns;
162			if (socket_info.nconns > cst_lst.max_conn) cst_lst.max_conn = socket_info.nconns;
163			#endif
164	elmex	1.1	}
165
166	root	1.20	client::~client ()
167	root	1.16	{
168	root	1.32	sockvec::iterator i = find (clients.begin (), clients.end (), this);
169			if (i != clients.end ())
170			clients.erase (i);
171
172	root	1.25	sfree<uint8> (faces_sent, nrofpixmaps);
173	root	1.22	free (stats.range);
174			free (stats.title);
175			free (host);
176	root	1.21	}
177
178			void
179	root	1.31	client::do_destroy ()
180	root	1.21	{
181	root	1.31	attachable::do_destroy ();
182
183			if (pl)
184			pl->disconnect ();
185
186			if (fd >= 0)
187			close (fd);
188	root	1.29
189	root	1.28	state = ST_DEAD;
190	root	1.27
191	root	1.21	socket_ev.suspend ();
192			cmd_ev.suspend ();
193	root	1.31
194			// socket now longer references us
195			refcnt_dec ();
196	root	1.16	}
197	elmex	1.1
198			/** This sets up the socket and reads all the image information into memory. */
199	root	1.7	void
200			init_ericserver (void)
201	elmex	1.1	{
202	root	1.7	cst_tot.time_start = time (NULL);
203			cst_lst.time_start = time (NULL);
204	elmex	1.1
205	root	1.7	LOG (llevDebug, "Initialize new client/server data\n");
206	root	1.11
207	root	1.7	read_client_images ();
208	elmex	1.1	}
209
210
211			/*******************************************************************************
212			*
213			* Start of functions dealing with freeing of the data.
214			*
215			******************************************************************************/
216
217			/** Free's all the memory that ericserver allocates. */
218	root	1.7	void
219			free_all_newserver (void)
220			{
221			LOG (llevDebug, "Freeing all new client/server information.\n");
222			free_socket_images ();
223	elmex	1.1	}
224
225	root	1.27	client *
226			client::create (int fd, const char *peername)
227	root	1.16	{
228			if (checkbanned (NULL, peername))
229			{
230			LOG (llevInfo, "Banned host tried to connect: [%s]\n", peername);
231	root	1.27	return 0;
232	root	1.16	}
233			else
234			{
235	root	1.20	client *ns = new client (dup (fd), peername);
236	root	1.27
237			ns->instantiate (); // effectively a nop right now
238
239			INVOKE_CLIENT (CONNECT, ns);
240
241			return ns;
242	root	1.16	}
243			}
244