server/include/client.h

/*
 * 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 (©) 2002,2007 Mark Wedel & Crossfire Development Team
 * 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>
 */

#ifndef CLIENT_H
#define CLIENT_H

#include <deque>
#include <bitset>
#include <tr1/unordered_set>

// (possibly) max. number of objects "per page" in the ground container
#define FLOORBOX_PAGESIZE 50

struct MapCell
{
  tag_t player;                 // this is, unfortunately, very wasteful of memory space, but pretty bandwidth-efficient
  int count;                   /* This is really darkness in the map1 command */
  faceidx faces[MAP_LAYERS];
  unsigned char stat_hp;       // health of something in this space, or 0
  unsigned char flags;
  uint8_t smooth[MAP_LAYERS];
};

#define MAX_CLIENT_X MAP_CLIENT_X
#define MAX_CLIENT_Y MAP_CLIENT_Y

struct Map
{
  struct MapCell cells[MAX_CLIENT_X][MAX_CLIENT_Y];
};

/* True max is 16383 given current map compaction method */
#define MAXANIMNUM  10000

struct statsinfo
{
  char *range, *title;
};

/* This contains basic information on the socket structure.  status is its
 * current state.  we set up our on buffers for sending/receiving, so we can
 * handle some higher level functions.  fd is the actual file descriptor we
 * are using.
 */

/* Only one map mode can actually be used, so lets make it a switch
 * instead of having a bunch of different fields that needed to
 * get toggled.
 */
enum { Map0Cmd = 0, Map1Cmd = 1, Map1aCmd = 2 };

// states the socket can be in
enum {
 ST_DEAD,     // socket is dead
 ST_SETUP,    // initial handshake / setup / login
 ST_PLAYING,  // logged in an playing
 ST_CUSTOM,   // waiting for custom reply

 ST_GET_PARTY_PASSWORD,
};

// a handler for a specific type of packet
enum {
  PF_PLAYER   = 0x01, // must have valid player / will by synchronised
  PF_PLAYING  = 0x02, // must be in playing state
  PF_COMMAND0 = 0x04, // command starts at offset 0
  PF_COMMAND6 = 0x08, // command starts at offset 6
};

struct packet_type
{
  const char *name;
  void *cb;
  int flags;
};

struct command
{
  tstamp stamp;
  const packet_type *handler;
  char *data;
  int datalen;

  ~command ()
  {
    sfree<char> (data, datalen + 1);
  }
};

/* how many times we are allowed to give the wrong password before being kicked. */
#define MAX_PASSWORD_FAILURES 5

INTERFACE_CLASS (client) // should become player when newsocket is a baseclass of player
struct client : zero_initialised, attachable
{
  int ACC (RW, fd);
  unsigned int inbuf_len;                 // number of bytes valid in inbuf
  statsinfo stats;
  object_vector_index ACC (RO, active);
  player_ptr ACC (RO, pl);

  /* The following is the setup for a ring buffer for storing output
   * data that the OS can't handle right away.
   */
  struct
  {
    char data[SOCKETBUFSIZE];
    int start;
    int len;
  } outputbuffer;

  char *ACC (RW, host);                   /* Which host it is connected from (ip address) */
  uint8 ACC (RW, state);                  /* Input state of the player (name, password, etc */

  sint8 ACC (RW, last_level);             /* Last level we sent to client */
  uint16 ACC (RW, last_flags);            /* fire/run on flags for last tick */
  float ACC (RW, last_weapon_sp);         /* if diff than weapon_sp, update client */
  sint32 ACC (RW, last_weight);           /* Last weight as sent to client; -1 means do not send weight */
  sint32 ACC (RW, last_weight_limit);     /* Last weight limit transmitted to client */
  uint32 ACC (RW, last_path_attuned);     /* Last spell attunment sent to client */
  uint32 ACC (RW, last_path_repelled);    /* Last spell repelled sent to client */
  uint32 ACC (RW, last_path_denied);      /* Last spell denied sent to client */
  living ACC (RO, last_stats);            /* Last stats as sent to client */
  float ACC (RW, last_speed);             /* Last speed as sent to client */
  sint16 ACC (RW, last_resist[NROFATTACKS]);/* last resist values sent to client */
  sint64 ACC (RW, last_skill_exp[NUM_SKILLS]);/* shadow register. if != exp. obj update client */

  bool ACC (RW, force_face0);             // client workaround for buggy checksum calculation in gcfclient
  bool ACC (RW, force_bad_checksum);      // client workaround for buggy checksum calculation in gcfclient
  bool ACC (RW, force_image_newmap);      // client workaround for client not redrawing map on image upload
  bool ACC (RW, enable_bg_scrub);         // client workaround, gcfclient becomes unusable if you send it images

  bool ACC (RW, afk);                     /* player is afk */
  bool ACC (RW, facecache);               /* If true, client is caching images */
  bool ACC (RW, sent_scroll);             
  bool ACC (RW, sound);                   /* does the client want sound */
  bool ACC (RW, newmapcmd);               /* Send newmap command when entering new map SMACFIGGEN */
  bool ACC (RW, plugincmd);               // extend the protocol through a plug-in */
  bool ACC (RW, mapinfocmd);              // return map info and send map change info
  bool ACC (RW, extcmd);                  // call into extensions/plugins
  bool ACC (RW, extmap);                  // extend map comamnd with extra data
  bool ACC (RW, buggy_mapscroll);         // client crashes on large mapscrolls
  bool ACC (RW, darkness);                /* True if client wants darkness information */
  bool ACC (RW, image2);                  /* Client wants image2/face2 commands */
  uint8_t ACC (RW, fxix);                 // client implements fx and ix (face|image extended) commands
  bool ACC (RW, update_look);             /* If true, we need to send the look window */
  bool ACC (RW, has_readable_type);       /* If true client accept additional text information */
                                          /* used to arrange text in books, scrolls, or scripted dialogs */
  bool ACC (RW, monitor_spells);          /* Client wishes to be informed when their spell list changes */
  bool ACC (RW, ext_mapinfos);            /* If true client accepts additional info on maps */
                                          /* Below are flags for extedend infos to pass to client 
                                           * with S->C mapextended command */
  bool ACC (RW, EMI_smooth);              /* Send smooth in extendmapinfos */
  bool ACC (RW, smoothing);               // trt-style smoothing
  bool ACC (RW, can_msg);                 // trt-style text messages

  bool ACC (RW, force_newmap);            // force a newmap before next map update
  uint32 ACC (RW, supported_readables);   /* each bit is a readable supported by client */
  uint32 ACC (RW, cs_version), ACC (RW, sc_version);        /* versions of the client */
  uint16 ACC (RW, look_position);         /* start of drawing of look window */
  uint16 ACC (RW, mss);                   // likely tcp maximum segment size
  uint8 ACC (RW, mapmode);                /* Type of map commands the client wants. */
  uint8 ACC (RW, mapx), ACC (RW, mapy);             /* How large a map the client wants */
  uint8 ACC (RW, itemcmd);                /* What version of the 'item' protocol command to use */

  maptile *ACC (RW, current_map);         // CF+ last/current player map
  region *ACC (RW, current_region);       // CF+ last/current player region
  int ACC (RW, current_x), ACC (RW, current_y);     // CF+ last/current map position
  shstr ACC (RW, version);                // CF+ client name/version
  uint8 ACC (RW, faceset);                // CF+ selected faceset

  tstamp ACC (RW, last_send);             // last data send on socket.

  int ACC (RW, rtt), ACC (RW, rttvar);    /* round-trip time and -variance, if known */

  int ACC (RW, rate_avail);               // current rate balance
  int ACC (RW, max_rate);                 // max. # of bytes to send per tick
  faceidx ACC (RW, scrub_idx);            // which face to send next
  int ACC (RW, bg_scrub);                 // how many ticks till the next background face send

  struct ixsend {
    int16_t pri; // unused
    faceidx idx;
    uint32_t ofs;  // if != 0, need to send remaining bytes of partial_face
  };
  std::vector<ixsend, slice_allocator<ixsend> > ixface; // which faces to send to the client using ix

  std::vector<faceidx, slice_allocator<faceidx> > fxface; // which faces to send using fx
  MTH void flush_fx (); // send fx if required

  void do_destroy ();
  void gather_callbacks (AV *&callbacks, event_type event) const;

  iow socket_ev; void socket_cb (iow &w, int got);
  iw  cmd_ev;    void cmd_cb (iw &w);

  std::deque< command, slice_allocator<command> > cmd_queue;

  // large structures at the end please
  struct Map lastmap;
  std::bitset<MAXANIMNUM> anims_sent;
  std::bitset<MAX_FACES> faces_sent;

  // if we get an incomplete packet, this is used to hold the data.
  // we add 2 byte for the header, one for the trailing 0 byte
  uint8 inbuf[MAXSOCKBUF + 2 + 1];

  enum { MSG_BUF_SIZE = 80, MSG_BUF_COUNT = 10 };
  struct msg_buf
  {
    tick_t expire;
    int len;
    int count;
    char msg[MSG_BUF_SIZE];
  } msgbuf[MSG_BUF_COUNT];

  MTH bool msg_suppressed (const char *msg);

  bool may_execute (const packet_type *pkt) const;
  void execute (const packet_type *pkt, char *data, int datalen);

  void queue_command (packet_type *handler, char *data, int datalen);
  MTH bool handle_command ();
  // resets movement state
  MTH void reset_state ();
  // resets variable data used to send stat diffs
  MTH void reset_stats ();

  MTH bool handle_packet ();
  int next_packet ();                     // returns length of packet or 0
  void skip_packet (int len);             // we have processed the packet, skip it

  MTH void flush ();
  MTH void write_outputbuffer ();
  MTH int outputbuffer_len () const { return outputbuffer.len; }
  void send (void *buf_, int len);

  void send_packet (const char *buf);
  void send_packet (const char *buf, int len);
  void send_packet_printf (const char *format, ...);
  void send_packet (packet &sl);

  void send_drawinfo (const char *msg, int flags = NDI_BLACK);
  MTH void send_face (faceidx facenum);
  MTH void send_image (faceidx facenum);
  MTH void send_faces (object *ob);
  MTH void send_animation (short anim_num);
  void send_msg (int color, const char *type, const char *msg);

  // called when something under the player changes
  MTH void floorbox_update () { update_look = 1; }
  // called when the player has been moved
  MTH void floorbox_reset  () { look_position = 0; floorbox_update (); }

  MTH void tick (); // called every server tick to do housekeeping etc.

  MTH static client *create (int fd, const char *peername);

protected:
  client (int fd, const char *from_ip);
  ~client ();
};

#define CLIENT_SUPPORT_READABLES(__sockPtr,__type)\
        ( ((__type)>0) &&\
          ((__sockPtr)->has_readable_type) && \
          ((__sockPtr)->supported_readables & (1<<(__type))) )

/* Constants in the form EMI_ is for extended map infos.
 * Even if the client select the additionnal infos it wants
 * on the map, there may exist cases where this whole info
 * is not given in one buch but in separate bunches. This 
 * is done performance reasons (imagine some info related to
 * a visible object and another info related to a 4 square
 * width and height area). At the begin of an extended info packet
 * is a bit field. A bit is activated for each extended info
 * present in the data 
 */

/* Meanings:
 * EMI_NOREDRAW  Take extended infos into account but don't redraw,
 *               some additionnal datas will follow in a new packet
 * EMI_SMOOTH    Datas about smoothing  
 */
#define EMI_NOREDRAW        0x01
#define EMI_SMOOTH          0x02

/* this last one says the bitfield continue un next byte
 * There may be several on contiguous bytes. So there is 7
 * actual bits used per byte, and the number of bytes
 * is not fixed in protocol
 */
#define EMI_HASMOREBITS     0x80

#define FACE_TYPES  1
#define PNG_FACE_INDEX  0

#define VERSION_CS 1023        /* version >= 1023 understand setup cmd */
#define VERSION_SC 1026
//#define VERSION_SC 1027 // requestinfo image_info and image_sums, makes extending faces on the fly impossible
#define VERSION_INFO "Crossfire TRT Server"

typedef object_vector<client, &client::active> sockvec;

extern sockvec clients;

#define for_all_clients(var)                    \
  for (int _i = 0; _i < clients.size (); ++_i)  \
    statementvar (client *, var, clients [_i])

#endif

Revision:	1.59
Committed:	Sun Jul 1 05:00:18 2007 UTC (16 years, 10 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.58:	+11 -12 lines
Log Message:	- upgrade crossfire trt to the GPL version 3 (hopefully correctly). - add a single file covered by the GNU Affero General Public License (which is not yet released, so I used the current draft, which is legally a bit wavy, but its likely better than nothing as it expresses direct intent by the authors, and we can upgrade as soon as it has been released). * this should ensure availability of source code for the server at least and hopefully also archetypes and maps even when modified versions are not being distributed, in accordance of section 13 of the agplv3.
#	Content
1	/*
2	* This file is part of Crossfire TRT, the Roguelike Realtime MORPG.
3	*
4	* Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team
5	* Copyright (©) 2002,2007 Mark Wedel & Crossfire Development Team
6	* Copyright (©) 1992,2007 Frank Tore Johansen
7	*
8	* 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	*
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, see <http://www.gnu.org/licenses/>.
20	*
21	* The authors can be reached via e-mail to <crossfire@schmorp.de>
22	*/
23
24	#ifndef CLIENT_H
25	#define CLIENT_H
26
27	#include <deque>
28	#include <bitset>
29	#include <tr1/unordered_set>
30
31	// (possibly) max. number of objects "per page" in the ground container
32	#define FLOORBOX_PAGESIZE 50
33
34	struct MapCell
35	{
36	tag_t player; // this is, unfortunately, very wasteful of memory space, but pretty bandwidth-efficient
37	int count; /* This is really darkness in the map1 command */
38	faceidx faces[MAP_LAYERS];
39	unsigned char stat_hp; // health of something in this space, or 0
40	unsigned char flags;
41	uint8_t smooth[MAP_LAYERS];
42	};
43
44	#define MAX_CLIENT_X MAP_CLIENT_X
45	#define MAX_CLIENT_Y MAP_CLIENT_Y
46
47	struct Map
48	{
49	struct MapCell cells[MAX_CLIENT_X][MAX_CLIENT_Y];
50	};
51
52	/* True max is 16383 given current map compaction method */
53	#define MAXANIMNUM 10000
54
55	struct statsinfo
56	{
57	char range, title;
58	};
59
60	/* This contains basic information on the socket structure. status is its
61	* current state. we set up our on buffers for sending/receiving, so we can
62	* handle some higher level functions. fd is the actual file descriptor we
63	* are using.
64	*/
65
66	/* Only one map mode can actually be used, so lets make it a switch
67	* instead of having a bunch of different fields that needed to
68	* get toggled.
69	*/
70	enum { Map0Cmd = 0, Map1Cmd = 1, Map1aCmd = 2 };
71
72	// states the socket can be in
73	enum {
74	ST_DEAD, // socket is dead
75	ST_SETUP, // initial handshake / setup / login
76	ST_PLAYING, // logged in an playing
77	ST_CUSTOM, // waiting for custom reply
78
79	ST_GET_PARTY_PASSWORD,
80	};
81
82	// a handler for a specific type of packet
83	enum {
84	PF_PLAYER = 0x01, // must have valid player / will by synchronised
85	PF_PLAYING = 0x02, // must be in playing state
86	PF_COMMAND0 = 0x04, // command starts at offset 0
87	PF_COMMAND6 = 0x08, // command starts at offset 6
88	};
89
90	struct packet_type
91	{
92	const char *name;
93	void *cb;
94	int flags;
95	};
96
97	struct command
98	{
99	tstamp stamp;
100	const packet_type *handler;
101	char *data;
102	int datalen;
103
104	~command ()
105	{
106	sfree<char> (data, datalen + 1);
107	}
108	};
109
110	/* how many times we are allowed to give the wrong password before being kicked. */
111	#define MAX_PASSWORD_FAILURES 5
112
113	INTERFACE_CLASS (client) // should become player when newsocket is a baseclass of player
114	struct client : zero_initialised, attachable
115	{
116	int ACC (RW, fd);
117	unsigned int inbuf_len; // number of bytes valid in inbuf
118	statsinfo stats;
119	object_vector_index ACC (RO, active);
120	player_ptr ACC (RO, pl);
121
122	/* The following is the setup for a ring buffer for storing output
123	* data that the OS can't handle right away.
124	*/
125	struct
126	{
127	char data[SOCKETBUFSIZE];
128	int start;
129	int len;
130	} outputbuffer;
131
132	char ACC (RW, host); / Which host it is connected from (ip address) */
133	uint8 ACC (RW, state); /* Input state of the player (name, password, etc */
134
135	sint8 ACC (RW, last_level); /* Last level we sent to client */
136	uint16 ACC (RW, last_flags); /* fire/run on flags for last tick */
137	float ACC (RW, last_weapon_sp); /* if diff than weapon_sp, update client */
138	sint32 ACC (RW, last_weight); /* Last weight as sent to client; -1 means do not send weight */
139	sint32 ACC (RW, last_weight_limit); /* Last weight limit transmitted to client */
140	uint32 ACC (RW, last_path_attuned); /* Last spell attunment sent to client */
141	uint32 ACC (RW, last_path_repelled); /* Last spell repelled sent to client */
142	uint32 ACC (RW, last_path_denied); /* Last spell denied sent to client */
143	living ACC (RO, last_stats); /* Last stats as sent to client */
144	float ACC (RW, last_speed); /* Last speed as sent to client */
145	sint16 ACC (RW, last_resist[NROFATTACKS]);/* last resist values sent to client */
146	sint64 ACC (RW, last_skill_exp[NUM_SKILLS]);/* shadow register. if != exp. obj update client */
147
148	bool ACC (RW, force_face0); // client workaround for buggy checksum calculation in gcfclient
149	bool ACC (RW, force_bad_checksum); // client workaround for buggy checksum calculation in gcfclient
150	bool ACC (RW, force_image_newmap); // client workaround for client not redrawing map on image upload
151	bool ACC (RW, enable_bg_scrub); // client workaround, gcfclient becomes unusable if you send it images
152
153	bool ACC (RW, afk); /* player is afk */
154	bool ACC (RW, facecache); /* If true, client is caching images */
155	bool ACC (RW, sent_scroll);
156	bool ACC (RW, sound); /* does the client want sound */
157	bool ACC (RW, newmapcmd); /* Send newmap command when entering new map SMACFIGGEN */
158	bool ACC (RW, plugincmd); // extend the protocol through a plug-in */
159	bool ACC (RW, mapinfocmd); // return map info and send map change info
160	bool ACC (RW, extcmd); // call into extensions/plugins
161	bool ACC (RW, extmap); // extend map comamnd with extra data
162	bool ACC (RW, buggy_mapscroll); // client crashes on large mapscrolls
163	bool ACC (RW, darkness); /* True if client wants darkness information */
164	bool ACC (RW, image2); /* Client wants image2/face2 commands */
165	uint8_t ACC (RW, fxix); // client implements fx and ix (face\|image extended) commands
166	bool ACC (RW, update_look); /* If true, we need to send the look window */
167	bool ACC (RW, has_readable_type); /* If true client accept additional text information */
168	/* used to arrange text in books, scrolls, or scripted dialogs */
169	bool ACC (RW, monitor_spells); /* Client wishes to be informed when their spell list changes */
170	bool ACC (RW, ext_mapinfos); /* If true client accepts additional info on maps */
171	/* Below are flags for extedend infos to pass to client
172	* with S->C mapextended command */
173	bool ACC (RW, EMI_smooth); /* Send smooth in extendmapinfos */
174	bool ACC (RW, smoothing); // trt-style smoothing
175	bool ACC (RW, can_msg); // trt-style text messages
176
177	bool ACC (RW, force_newmap); // force a newmap before next map update
178	uint32 ACC (RW, supported_readables); /* each bit is a readable supported by client */
179	uint32 ACC (RW, cs_version), ACC (RW, sc_version); /* versions of the client */
180	uint16 ACC (RW, look_position); /* start of drawing of look window */
181	uint16 ACC (RW, mss); // likely tcp maximum segment size
182	uint8 ACC (RW, mapmode); /* Type of map commands the client wants. */
183	uint8 ACC (RW, mapx), ACC (RW, mapy); /* How large a map the client wants */
184	uint8 ACC (RW, itemcmd); /* What version of the 'item' protocol command to use */
185
186	maptile *ACC (RW, current_map); // CF+ last/current player map
187	region *ACC (RW, current_region); // CF+ last/current player region
188	int ACC (RW, current_x), ACC (RW, current_y); // CF+ last/current map position
189	shstr ACC (RW, version); // CF+ client name/version
190	uint8 ACC (RW, faceset); // CF+ selected faceset
191
192	tstamp ACC (RW, last_send); // last data send on socket.
193
194	int ACC (RW, rtt), ACC (RW, rttvar); /* round-trip time and -variance, if known */
195
196	int ACC (RW, rate_avail); // current rate balance
197	int ACC (RW, max_rate); // max. # of bytes to send per tick
198	faceidx ACC (RW, scrub_idx); // which face to send next
199	int ACC (RW, bg_scrub); // how many ticks till the next background face send
200
201	struct ixsend {
202	int16_t pri; // unused
203	faceidx idx;
204	uint32_t ofs; // if != 0, need to send remaining bytes of partial_face
205	};
206	std::vector<ixsend, slice_allocator<ixsend> > ixface; // which faces to send to the client using ix
207
208	std::vector<faceidx, slice_allocator<faceidx> > fxface; // which faces to send using fx
209	MTH void flush_fx (); // send fx if required
210
211	void do_destroy ();
212	void gather_callbacks (AV *&callbacks, event_type event) const;
213
214	iow socket_ev; void socket_cb (iow &w, int got);
215	iw cmd_ev; void cmd_cb (iw &w);
216
217	std::deque< command, slice_allocator<command> > cmd_queue;
218
219	// large structures at the end please
220	struct Map lastmap;
221	std::bitset<MAXANIMNUM> anims_sent;
222	std::bitset<MAX_FACES> faces_sent;
223
224	// if we get an incomplete packet, this is used to hold the data.
225	// we add 2 byte for the header, one for the trailing 0 byte
226	uint8 inbuf[MAXSOCKBUF + 2 + 1];
227
228	enum { MSG_BUF_SIZE = 80, MSG_BUF_COUNT = 10 };
229	struct msg_buf
230	{
231	tick_t expire;
232	int len;
233	int count;
234	char msg[MSG_BUF_SIZE];
235	} msgbuf[MSG_BUF_COUNT];
236
237	MTH bool msg_suppressed (const char *msg);
238
239	bool may_execute (const packet_type *pkt) const;
240	void execute (const packet_type pkt, char data, int datalen);
241
242	void queue_command (packet_type handler, char data, int datalen);
243	MTH bool handle_command ();
244	// resets movement state
245	MTH void reset_state ();
246	// resets variable data used to send stat diffs
247	MTH void reset_stats ();
248
249	MTH bool handle_packet ();
250	int next_packet (); // returns length of packet or 0
251	void skip_packet (int len); // we have processed the packet, skip it
252
253	MTH void flush ();
254	MTH void write_outputbuffer ();
255	MTH int outputbuffer_len () const { return outputbuffer.len; }
256	void send (void *buf_, int len);
257
258	void send_packet (const char *buf);
259	void send_packet (const char *buf, int len);
260	void send_packet_printf (const char *format, ...);
261	void send_packet (packet &sl);
262
263	void send_drawinfo (const char *msg, int flags = NDI_BLACK);
264	MTH void send_face (faceidx facenum);
265	MTH void send_image (faceidx facenum);
266	MTH void send_faces (object *ob);
267	MTH void send_animation (short anim_num);
268	void send_msg (int color, const char type, const char msg);
269
270	// called when something under the player changes
271	MTH void floorbox_update () { update_look = 1; }
272	// called when the player has been moved
273	MTH void floorbox_reset () { look_position = 0; floorbox_update (); }
274
275	MTH void tick (); // called every server tick to do housekeeping etc.
276
277	MTH static client create (int fd, const char peername);
278
279	protected:
280	client (int fd, const char *from_ip);
281	~client ();
282	};
283
284	#define CLIENT_SUPPORT_READABLES(__sockPtr,__type)\
285	( ((__type)>0) &&\
286	((__sockPtr)->has_readable_type) && \
287	((__sockPtr)->supported_readables & (1<<(__type))) )
288
289	/* Constants in the form EMI_ is for extended map infos.
290	* Even if the client select the additionnal infos it wants
291	* on the map, there may exist cases where this whole info
292	* is not given in one buch but in separate bunches. This
293	* is done performance reasons (imagine some info related to
294	* a visible object and another info related to a 4 square
295	* width and height area). At the begin of an extended info packet
296	* is a bit field. A bit is activated for each extended info
297	* present in the data
298	*/
299
300	/* Meanings:
301	* EMI_NOREDRAW Take extended infos into account but don't redraw,
302	* some additionnal datas will follow in a new packet
303	* EMI_SMOOTH Datas about smoothing
304	*/
305	#define EMI_NOREDRAW 0x01
306	#define EMI_SMOOTH 0x02
307
308	/* this last one says the bitfield continue un next byte
309	* There may be several on contiguous bytes. So there is 7
310	* actual bits used per byte, and the number of bytes
311	* is not fixed in protocol
312	*/
313	#define EMI_HASMOREBITS 0x80
314
315	#define FACE_TYPES 1
316	#define PNG_FACE_INDEX 0
317
318	#define VERSION_CS 1023 /* version >= 1023 understand setup cmd */
319	#define VERSION_SC 1026
320	//#define VERSION_SC 1027 // requestinfo image_info and image_sums, makes extending faces on the fly impossible
321	#define VERSION_INFO "Crossfire TRT Server"
322
323	typedef object_vector<client, &client::active> sockvec;
324
325	extern sockvec clients;
326
327	#define for_all_clients(var) \
328	for (int _i = 0; _i < clients.size (); ++_i) \
329	statementvar (client *, var, clients [_i])
330
331	#endif
332