server/socket/init.C

/*
    CrossFire, A Multiplayer game for X-windows

    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 <netdb.h>

#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif

#ifdef HAVE_ARPA_INET_H
# include <arpa/inet.h>
#endif
#include <newserver.h>

Socket_Info socket_info;
NewSocket *init_sockets;

/**
 * Initializes a connection. Really, it just sets up the data structure,
 * socket setup is handled elsewhere.  We do send a version to the
 * client.
 */
void
InitConnection (NewSocket *ns, const char *from_ip)
{
  int bufsize = 65535;          /*Supposed absolute upper limit */
  int oldbufsize;
  int buflen = sizeof (int);

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

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

  if (oldbufsize < bufsize)
    if (setsockopt (ns->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 (ns->fd, SOL_SOCKET, SO_SNDBUF, (char *) &oldbufsize, (socklen_t *) & buflen);
#ifdef ESRV_DEBUG
  LOG (llevDebug, "Socket buffer size now %d bytes\n", oldbufsize);
#endif

  ns->faceset = 0;
  ns->facecache = 0;
  ns->image2 = 0;
  ns->sound = 0;
  ns->exp64 = 0;
  ns->monitor_spells = 0;
  ns->mapmode = Map0Cmd;
  ns->darkness = 1;
  ns->status = Ns_Add;
  ns->mapx = 11;
  ns->mapy = 11;
  ns->newmapcmd = 0;
  ns->itemcmd = 1;              /* Default is version item1 command */
  ns->ext_mapinfos = 0;         /*extendedmapinfo datas */
  ns->EMI_smooth = 0;
  ns->look_position = 0;
  ns->update_look = 0;
  ns->has_readable_type = 0;
  ns->supported_readables = 0;
  ns->monitor_spells = 0;
  ns->mapinfocmd = 0;
  ns->extcmd = 0;
  ns->extmap = 0;

  /* we should really do some checking here - if total clients overflows
   * we need to do something more intelligent, because client id's will start
   * duplicating (not likely in normal cases, but malicous attacks that
   * just open and close connections could get this total up.
   */
  ns->inbuf_len = 0;

  /* Basic initialization. Needed because we do a check in
   * HandleClient for oldsocketmode without checking the
   * length of data.
   */
  memset (&ns->lastmap, 0, sizeof (struct Map));
  memset (ns->faces_sent, 0, ns->faces_sent_len * sizeof (*ns->faces_sent));
  memset (&ns->anims_sent, 0, sizeof (ns->anims_sent));
  memset (&ns->stats, 0, sizeof (struct statsinfo));
  /* 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.
   */
  ns->faces_sent[0] = NS_FACESENT_FACE;

  ns->outputbuffer.start = 0;
  ns->outputbuffer.len = 0;
  ns->can_write = 1;
  ns->password_fails = 0;

  ns->current_map = 0;
  ns->current_x = 0;
  ns->current_y = 0;
  ns->client[0] = 0;
  ns->buggy_mapscroll = 0;

  ns->sent_scroll = 0;
  ns->host = strdup_local (from_ip);

  {
    packet sl;

    sl.printf ("version %d %d %s\n", VERSION_CS, VERSION_SC, VERSION_INFO);
    Send_With_Handling (ns, &sl);
  }

#ifdef CS_LOGSTATS
  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
}


/** This sets up the socket and reads all the image information into memory. */
void
init_ericserver (void)
{
  struct sockaddr_in insock;
  struct protoent *protox;
  struct linger linger_opt;

  socket_info.max_filedescriptor = sysconf (_SC_OPEN_MAX);

  socket_info.timeout.tv_sec = 0;
  socket_info.timeout.tv_usec = 0;
  socket_info.nconns = 0;

#ifdef CS_LOGSTATS
  memset (&cst_tot, 0, sizeof (CS_Stats));
  memset (&cst_lst, 0, sizeof (CS_Stats));
  cst_tot.time_start = time (NULL);
  cst_lst.time_start = time (NULL);
#endif

  LOG (llevDebug, "Initialize new client/server data\n");
  socket_info.nconns = 1;
  init_sockets = (NewSocket *) malloc (sizeof (NewSocket));
  init_sockets[0].faces_sent = NULL;    /* unused */
  socket_info.allocated_sockets = 1;

  protox = getprotobyname ("tcp");
  if (protox == NULL)
    {
      LOG (llevError, "init_ericserver: Error getting protox\n");
      return;
    }

  init_sockets[0].fd = socket (PF_INET, SOCK_STREAM, protox->p_proto);
  if (init_sockets[0].fd == -1)
    {
      LOG (llevError, "Cannot create socket: %s\n", strerror (errno));
      exit (-1);
    }

  insock.sin_family = AF_INET;
  insock.sin_port = htons (settings.csport);
  insock.sin_addr.s_addr = htonl (INADDR_ANY);

  linger_opt.l_onoff = 0;
  linger_opt.l_linger = 0;
  if (setsockopt (init_sockets[0].fd, SOL_SOCKET, SO_LINGER, (char *) &linger_opt, sizeof (struct linger)))
    LOG (llevError, "Cannot setsockopt(SO_LINGER): %s\n", strerror (errno));

  {
    int tmp = 1;

    if (setsockopt (init_sockets[0].fd, SOL_SOCKET, SO_REUSEADDR, &tmp, sizeof (tmp)))
      LOG (llevError, "Cannot setsockopt(SO_REUSEADDR): %s\n", strerror (errno));
  }

  if (bind (init_sockets[0].fd, (struct sockaddr *) &insock, sizeof (insock)) == (-1))
    {
      LOG (llevError, "Cannot bind socket to port %d: %s\n", ntohs (insock.sin_port), strerror (errno));
      close (init_sockets[0].fd);
      exit (-1);
    }

  if (listen (init_sockets[0].fd, 5) == (-1))
    {
      LOG (llevError, "Cannot listen on socket: %s\n", strerror (errno));
      close (init_sockets[0].fd);
      exit (-1);
    }

  init_sockets[0].status = Ns_Add;
  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 ();
  free (init_sockets);
}

/**
 * Frees a socket.
 * Basically, all we need to do here is free all data structures that
 * might be associated with the socket.  It is up to the caller to
 * update the list
 */

void
free_newsocket (NewSocket *ns)
{
  close (ns->fd);

  if (ns->stats.range)
    free (ns->stats.range);

  if (ns->stats.title)
    free (ns->stats.title);

  free (ns->host);
}

/** Sends the 'goodbye' command to the player, and closes connection. */
void
final_free_player (player *pl)
{
  pl->socket.send_packet ("goodbye");
  free_newsocket (&pl->socket);
  free_player (pl);
}

Revision:	1.14
Committed:	Thu Dec 14 01:21:58 2006 UTC (17 years, 5 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.13:	+1 -2 lines
Log Message:	moar rewrite
#	Content
1	/*
2	CrossFire, A Multiplayer game for X-windows
3
4	Copyright (C) 2001 Mark Wedel
5	Copyright (C) 1992 Frank Tore Johansen
6
7	This program is free software; you can redistribute it and/or modify
8	it under the terms of the GNU General Public License as published by
9	the Free Software Foundation; either version 2 of the License, or
10	(at your 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 GNU General Public License
18	along with this program; if not, write to the Free Software
19	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20
21	The author can be reached via e-mail to <crossfire@schmorp.de>
22	*/
23
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
36	#include <global.h>
37	#include <sproto.h>
38	#include <sys/types.h>
39	#include <sys/time.h>
40	#include <sys/socket.h>
41	#include <netinet/in.h>
42	#include <netdb.h>
43
44	#ifdef HAVE_UNISTD_H
45	# include <unistd.h>
46	#endif
47
48	#ifdef HAVE_ARPA_INET_H
49	# include <arpa/inet.h>
50	#endif
51	#include <newserver.h>
52
53	Socket_Info socket_info;
54	NewSocket *init_sockets;
55
56	/**
57	* Initializes a connection. Really, it just sets up the data structure,
58	* socket setup is handled elsewhere. We do send a version to the
59	* client.
60	*/
61	void
62	InitConnection (NewSocket ns, const char from_ip)
63	{
64	int bufsize = 65535; /Supposed absolute upper limit /
65	int oldbufsize;
66	int buflen = sizeof (int);
67
68	if (fcntl (ns->fd, F_SETFL, O_NONBLOCK) == -1)
69	LOG (llevError, "InitConnection: Error on fcntl.\n");
70
71	if (getsockopt (ns->fd, SOL_SOCKET, SO_SNDBUF, (char ) &oldbufsize, (socklen_t ) & buflen) == -1)
72	oldbufsize = 0;
73
74	if (oldbufsize < bufsize)
75	if (setsockopt (ns->fd, SOL_SOCKET, SO_SNDBUF, (char *) &bufsize, sizeof (&bufsize)))
76	LOG (llevError, "InitConnection: setsockopt unable to set output buf size to %d\n", bufsize);
77
78	buflen = sizeof (oldbufsize);
79	getsockopt (ns->fd, SOL_SOCKET, SO_SNDBUF, (char ) &oldbufsize, (socklen_t ) & buflen);
80	#ifdef ESRV_DEBUG
81	LOG (llevDebug, "Socket buffer size now %d bytes\n", oldbufsize);
82	#endif
83
84	ns->faceset = 0;
85	ns->facecache = 0;
86	ns->image2 = 0;
87	ns->sound = 0;
88	ns->exp64 = 0;
89	ns->monitor_spells = 0;
90	ns->mapmode = Map0Cmd;
91	ns->darkness = 1;
92	ns->status = Ns_Add;
93	ns->mapx = 11;
94	ns->mapy = 11;
95	ns->newmapcmd = 0;
96	ns->itemcmd = 1; /* Default is version item1 command */
97	ns->ext_mapinfos = 0; /extendedmapinfo datas /
98	ns->EMI_smooth = 0;
99	ns->look_position = 0;
100	ns->update_look = 0;
101	ns->has_readable_type = 0;
102	ns->supported_readables = 0;
103	ns->monitor_spells = 0;
104	ns->mapinfocmd = 0;
105	ns->extcmd = 0;
106	ns->extmap = 0;
107
108	/* we should really do some checking here - if total clients overflows
109	* we need to do something more intelligent, because client id's will start
110	* duplicating (not likely in normal cases, but malicous attacks that
111	* just open and close connections could get this total up.
112	*/
113	ns->inbuf_len = 0;
114
115	/* Basic initialization. Needed because we do a check in
116	* HandleClient for oldsocketmode without checking the
117	* length of data.
118	*/
119	memset (&ns->lastmap, 0, sizeof (struct Map));
120	memset (ns->faces_sent, 0, ns->faces_sent_len * sizeof (*ns->faces_sent));
121	memset (&ns->anims_sent, 0, sizeof (ns->anims_sent));
122	memset (&ns->stats, 0, sizeof (struct statsinfo));
123	/* Do this so we don't send a face command for the client for
124	* this face. Face 0 is sent to the client to say clear
125	* face information.
126	*/
127	ns->faces_sent[0] = NS_FACESENT_FACE;
128
129	ns->outputbuffer.start = 0;
130	ns->outputbuffer.len = 0;
131	ns->can_write = 1;
132	ns->password_fails = 0;
133
134	ns->current_map = 0;
135	ns->current_x = 0;
136	ns->current_y = 0;
137	ns->client[0] = 0;
138	ns->buggy_mapscroll = 0;
139
140	ns->sent_scroll = 0;
141	ns->host = strdup_local (from_ip);
142
143	{
144	packet sl;
145
146	sl.printf ("version %d %d %s\n", VERSION_CS, VERSION_SC, VERSION_INFO);
147	Send_With_Handling (ns, &sl);
148	}
149
150	#ifdef CS_LOGSTATS
151	if (socket_info.nconns > cst_tot.max_conn)
152	cst_tot.max_conn = socket_info.nconns;
153	if (socket_info.nconns > cst_lst.max_conn)
154	cst_lst.max_conn = socket_info.nconns;
155	#endif
156	}
157
158
159	/** This sets up the socket and reads all the image information into memory. */
160	void
161	init_ericserver (void)
162	{
163	struct sockaddr_in insock;
164	struct protoent *protox;
165	struct linger linger_opt;
166
167	socket_info.max_filedescriptor = sysconf (_SC_OPEN_MAX);
168
169	socket_info.timeout.tv_sec = 0;
170	socket_info.timeout.tv_usec = 0;
171	socket_info.nconns = 0;
172
173	#ifdef CS_LOGSTATS
174	memset (&cst_tot, 0, sizeof (CS_Stats));
175	memset (&cst_lst, 0, sizeof (CS_Stats));
176	cst_tot.time_start = time (NULL);
177	cst_lst.time_start = time (NULL);
178	#endif
179
180	LOG (llevDebug, "Initialize new client/server data\n");
181	socket_info.nconns = 1;
182	init_sockets = (NewSocket *) malloc (sizeof (NewSocket));
183	init_sockets[0].faces_sent = NULL; /* unused */
184	socket_info.allocated_sockets = 1;
185
186	protox = getprotobyname ("tcp");
187	if (protox == NULL)
188	{
189	LOG (llevError, "init_ericserver: Error getting protox\n");
190	return;
191	}
192
193	init_sockets[0].fd = socket (PF_INET, SOCK_STREAM, protox->p_proto);
194	if (init_sockets[0].fd == -1)
195	{
196	LOG (llevError, "Cannot create socket: %s\n", strerror (errno));
197	exit (-1);
198	}
199
200	insock.sin_family = AF_INET;
201	insock.sin_port = htons (settings.csport);
202	insock.sin_addr.s_addr = htonl (INADDR_ANY);
203
204	linger_opt.l_onoff = 0;
205	linger_opt.l_linger = 0;
206	if (setsockopt (init_sockets[0].fd, SOL_SOCKET, SO_LINGER, (char *) &linger_opt, sizeof (struct linger)))
207	LOG (llevError, "Cannot setsockopt(SO_LINGER): %s\n", strerror (errno));
208
209	{
210	int tmp = 1;
211
212	if (setsockopt (init_sockets[0].fd, SOL_SOCKET, SO_REUSEADDR, &tmp, sizeof (tmp)))
213	LOG (llevError, "Cannot setsockopt(SO_REUSEADDR): %s\n", strerror (errno));
214	}
215
216	if (bind (init_sockets[0].fd, (struct sockaddr *) &insock, sizeof (insock)) == (-1))
217	{
218	LOG (llevError, "Cannot bind socket to port %d: %s\n", ntohs (insock.sin_port), strerror (errno));
219	close (init_sockets[0].fd);
220	exit (-1);
221	}
222
223	if (listen (init_sockets[0].fd, 5) == (-1))
224	{
225	LOG (llevError, "Cannot listen on socket: %s\n", strerror (errno));
226	close (init_sockets[0].fd);
227	exit (-1);
228	}
229
230	init_sockets[0].status = Ns_Add;
231	read_client_images ();
232	}
233
234
235	/*******************************************************************************
236	*
237	* Start of functions dealing with freeing of the data.
238	*
239	******************************************************************************/
240
241	/** Free's all the memory that ericserver allocates. */
242	void
243	free_all_newserver (void)
244	{
245	LOG (llevDebug, "Freeing all new client/server information.\n");
246	free_socket_images ();
247	free (init_sockets);
248	}
249
250	/**
251	* Frees a socket.
252	* Basically, all we need to do here is free all data structures that
253	* might be associated with the socket. It is up to the caller to
254	* update the list
255	*/
256
257	void
258	free_newsocket (NewSocket *ns)
259	{
260	close (ns->fd);
261
262	if (ns->stats.range)
263	free (ns->stats.range);
264
265	if (ns->stats.title)
266	free (ns->stats.title);
267
268	free (ns->host);
269	}
270
271	/** Sends the 'goodbye' command to the player, and closes connection. */
272	void
273	final_free_player (player *pl)
274	{
275	pl->socket.send_packet ("goodbye");
276	free_newsocket (&pl->socket);
277	free_player (pl);
278	}
279