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root/svn/ircd-hybrid-8/include/client.h
Revision: 1358
Committed: Sun Apr 22 13:49:23 2012 UTC (11 years, 11 months ago) by michael
Content type: text/x-chdr
File size: 20898 byte(s)
Log Message:
- cleanup and rewrite whowas.c to use the dlink list manipulation routines
- increase NICKNAMEHISTORYLENGTH to 16384

File Contents

# Content
1 /*
2 * ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3 *
4 * Copyright (C) 2002 by the past and present ircd coders, and others.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
19 * USA
20 */
21
22 /*! \file client.h
23 * \brief Header including structures, macros and prototypes for client handling
24 * \version $Id$
25 */
26
27
28 #ifndef INCLUDED_client_h
29 #define INCLUDED_client_h
30
31 #include "list.h"
32 #include "fdlist.h"
33 #include "config.h"
34 #include "ircd_defs.h"
35 #include "dbuf.h"
36 #include "channel.h"
37
38 #define HOSTIPLEN 53 /* sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255.ipv6") */
39 #define PASSWDLEN 20
40 #define IDLEN 12 /* this is the maximum length, not the actual
41 generated length; DO NOT CHANGE! */
42
43 /*
44 * pre declare structs
45 */
46 struct AccessItem;
47 struct Listener;
48 struct Client;
49 struct LocalUser;
50
51
52
53 /*! \brief addr_mask_type enumeration */
54 enum addr_mask_type
55 {
56 HIDE_IP, /**< IP is hidden. Resolved hostname is shown instead */
57 SHOW_IP, /**< IP is shown. No parts of it are hidden or masked */
58 MASK_IP /**< IP is masked. 255.255.255.255 is shown instead */
59 };
60
61 /*! \brief Server structure */
62 struct Server
63 {
64 struct ConfItem *sconf; /**< ConfItem connect{} pointer for this server */
65 dlink_list server_list; /**< Servers on this server */
66 dlink_list client_list; /**< Clients on this server */
67 char by[NICKLEN]; /**< who activated this connection */
68 };
69
70 /*! \brief ListTask structure */
71 struct ListTask
72 {
73 dlink_list show_mask; /**< show these channels.. */
74 dlink_list hide_mask; /**< ..and hide these ones */
75
76 unsigned int hash_index; /**< the bucket we are currently in */
77 unsigned int users_min;
78 unsigned int users_max;
79 unsigned int created_min;
80 unsigned int created_max;
81 unsigned int topicts_min;
82 unsigned int topicts_max;
83 };
84
85 /*! \brief Client structure */
86 struct Client
87 {
88 dlink_node node;
89 dlink_node lnode; /**< Used for Server->servers/users */
90
91 struct LocalUser *localClient;
92 struct Client *hnext; /**< For client hash table lookups by name */
93 struct Client *idhnext; /**< For SID hash table lookups by sid */
94 struct Server *serv; /**< ...defined, if this is a server */
95 struct Client *servptr; /**< Points to server this Client is on */
96 struct Client *from; /**< == self, if Local Client, *NEVER* NULL! */
97 char *away; /**< Client's AWAY message. Can be set/unset via AWAY command */
98
99 time_t tsinfo; /**< TS on the nick, SVINFO on server */
100 time_t servicestamp; /**< Last time client has been identified for its nick */
101
102 unsigned int flags; /**< client flags */
103 unsigned int umodes; /**< opers, normal users subset */
104 unsigned int hopcount; /**< number of servers to this 0 = local */
105 unsigned int status; /**< Client type */
106 unsigned int handler; /**< Handler index */
107
108 dlink_list whowas;
109 dlink_list channel; /**< chain of channel pointer blocks */
110
111 char name[HOSTLEN + 1]; /**< unique name for a client nick or host */
112 char id[IDLEN + 1]; /**< client ID, unique ID per client */
113
114 /*
115 * client->username is the username from ident or the USER message,
116 * If the client is idented the USER message is ignored, otherwise
117 * the username part of the USER message is put here prefixed with a
118 * tilde depending on the auth{} block. Once a client has registered,
119 * this field should be considered read-only.
120 */
121 char username[USERLEN + 1]; /* client's username */
122
123 /*
124 * client->host contains the resolved name or ip address
125 * as a string for the user, it may be fiddled with for oper spoofing etc.
126 * once it's changed the *real* address goes away. This should be
127 * considered a read-only field after the client has registered.
128 */
129 char host[HOSTLEN + 1]; /* client's hostname */
130
131 /*
132 * client->info for unix clients will normally contain the info from the
133 * gcos field in /etc/passwd but anything can go here.
134 */
135 char info[REALLEN + 1]; /* Free form additional client info */
136
137 /*
138 * client->sockhost contains the ip address gotten from the socket as a
139 * string, this field should be considered read-only once the connection
140 * has been made. (set in s_bsd.c only)
141 */
142 char sockhost[HOSTIPLEN + 1]; /* This is the host name from the
143 socket ip address as string */
144 };
145
146 /*! \brief LocalUser structure
147 *
148 * Allocated only for local clients, that are directly connected
149 * to \b this server with a socket.
150 */
151 struct LocalUser
152 {
153 dlink_node lclient_node;
154
155 char client_host[HOSTLEN + 1];
156 char client_server[HOSTLEN + 1];
157
158 unsigned int registration;
159 unsigned int cap_client; /**< Client capabilities (from us) */
160 unsigned int cap_active; /**< Active capabilities (to us) */
161 unsigned int caps; /**< capabilities bit-field */
162
163 unsigned int operflags; /**< IRC Operator privilege flags */
164 unsigned int random_ping; /**< Holding a 32bit value used for PING cookies */
165
166 unsigned int serial; /**< used to enforce 1 send per nick */
167
168 time_t lasttime; /**< ...should be only LOCAL clients? --msa */
169 time_t firsttime; /**< time client was created */
170 time_t since; /**< last time we parsed something */
171 time_t last_knock; /**< time of last knock */
172 time_t last_away; /**< Away since... */
173 time_t last_join_time; /**< when this client last
174 joined a channel */
175 time_t last_leave_time; /**< when this client last
176 * left a channel */
177 int join_leave_count; /**< count of JOIN/LEAVE in less than
178 MIN_JOIN_LEAVE_TIME seconds */
179 int oper_warn_count_down; /**< warn opers of this possible
180 spambot every time this gets to 0 */
181 time_t reject_delay;
182 time_t last_caller_id_time;
183 time_t first_received_message_time;
184 time_t last_nick_change;
185 time_t last_privmsg; /**< Last time we got a PRIVMSG */
186
187 int received_number_of_privmsgs;
188 unsigned int number_of_nick_changes;
189
190 struct ListTask *list_task;
191
192 struct dbuf_queue buf_sendq;
193 struct dbuf_queue buf_recvq;
194
195 struct {
196 unsigned int messages; /**< Statistics: protocol messages sent/received */
197 uint64_t bytes; /**< Statistics: total bytes sent/received */
198 } recv, send;
199
200 struct AuthRequest *auth;
201 struct Listener *listener; /**< listener accepted from */
202 dlink_list acceptlist; /**< clients I'll allow to talk to me */
203 dlink_list watches; /**< chain of Watch pointer blocks */
204 dlink_list confs; /**< Configuration record associated */
205 dlink_list invited; /**< chain of invite pointer blocks */
206 struct irc_ssaddr ip;
207 int aftype; /**< Makes life easier for DNS res in IPV6 */
208
209 char *passwd;
210 fde_t fd;
211
212 /* Anti-flood stuff. We track how many messages were parsed and how
213 * many we were allowed in the current second, and apply a simple
214 * decay to avoid flooding.
215 * -- adrian
216 */
217 int allow_read; /**< how many we're allowed to read in this second */
218 int sent_parsed; /**< how many messages we've parsed in this second */
219
220 char* response; /**< expected response from client */
221 char* auth_oper; /**< Operator to become if they supply the response.*/
222 };
223
224 /*
225 * status macros.
226 */
227 #define STAT_CONNECTING 0x01
228 #define STAT_HANDSHAKE 0x02
229 #define STAT_ME 0x04
230 #define STAT_UNKNOWN 0x08
231 #define STAT_SERVER 0x10
232 #define STAT_CLIENT 0x20
233
234 #define REG_NEED_USER 0x1
235 #define REG_NEED_NICK 0x2
236 #define REG_NEED_CAP 0x4
237 #define REG_INIT (REG_NEED_USER|REG_NEED_NICK)
238
239 #define HasID(x) ((x)->id[0] != '\0')
240 #define ID(x) (HasID(x) ? (x)->id : (x)->name)
241 #define ID_or_name(x,client_p) ((IsCapable(client_p, CAP_TS6) && HasID(x)) ? (x)->id : (x)->name)
242
243 #define IsRegistered(x) ((x)->status > STAT_UNKNOWN)
244 #define IsConnecting(x) ((x)->status == STAT_CONNECTING)
245 #define IsHandshake(x) ((x)->status == STAT_HANDSHAKE)
246 #define IsMe(x) ((x)->status == STAT_ME)
247 #define IsUnknown(x) ((x)->status == STAT_UNKNOWN)
248 #define IsServer(x) ((x)->status == STAT_SERVER)
249 #define IsClient(x) ((x)->status == STAT_CLIENT)
250
251 #define SetConnecting(x) {(x)->status = STAT_CONNECTING; \
252 (x)->handler = UNREGISTERED_HANDLER; }
253
254 #define SetHandshake(x) {(x)->status = STAT_HANDSHAKE; \
255 (x)->handler = UNREGISTERED_HANDLER; }
256
257 #define SetMe(x) {(x)->status = STAT_ME; \
258 (x)->handler = UNREGISTERED_HANDLER; }
259
260 #define SetUnknown(x) {(x)->status = STAT_UNKNOWN; \
261 (x)->handler = UNREGISTERED_HANDLER; }
262
263 #define SetServer(x) {(x)->status = STAT_SERVER; \
264 (x)->handler = SERVER_HANDLER; }
265
266 #define SetClient(x) {(x)->status = STAT_CLIENT; \
267 (x)->handler = HasUMode(x, UMODE_OPER) ? \
268 OPER_HANDLER : CLIENT_HANDLER; }
269
270 #define MyConnect(x) ((x)->localClient != NULL)
271 #define MyClient(x) (MyConnect(x) && IsClient(x))
272
273 /*
274 * ts stuff
275 */
276 #define TS_CURRENT 6 /**< current TS protocol version */
277 #define TS_MIN 5 /**< minimum supported TS protocol version */
278 #define TS_DOESTS 0x20000000
279 #define DoesTS(x) ((x)->tsinfo == TS_DOESTS)
280
281
282
283 #define CAP_MULTI_PREFIX 0x00000001
284
285 #define HasCap(x, y) ((x)->localClient->cap_active & (y))
286
287 /* housekeeping flags */
288 #define FLAGS_PINGSENT 0x00000001 /**< Unreplied ping sent */
289 #define FLAGS_DEADSOCKET 0x00000002 /**< Local socket is dead--Exiting soon */
290 #define FLAGS_KILLED 0x00000004 /**< Prevents "QUIT" from being sent for this */
291 #define FLAGS_CLOSING 0x00000008 /**< set when closing to suppress errors */
292 #define FLAGS_GOTID 0x00000010 /**< successful ident lookup achieved */
293 #define FLAGS_NEEDID 0x00000020 /**< auth{} block say must use ident return */
294 #define FLAGS_SENDQEX 0x00000040 /**< Sendq exceeded */
295 #define FLAGS_IPHASH 0x00000080 /**< iphashed this client */
296 #define FLAGS_MARK 0x00000100 /**< marked client */
297 #define FLAGS_CANFLOOD 0x00000200 /**< client has the ability to flood */
298 #define FLAGS_EXEMPTGLINE 0x00000400 /**< client can't be G-lined */
299 #define FLAGS_EXEMPTKLINE 0x00000800 /**< client is exempt from kline */
300 #define FLAGS_NOLIMIT 0x00001000 /**< client is exempt from limits */
301 #define FLAGS_PING_COOKIE 0x00002000 /**< PING Cookie */
302 #define FLAGS_IP_SPOOFING 0x00004000 /**< client IP is spoofed */
303 #define FLAGS_FLOODDONE 0x00008000 /**< Flood grace period has been ended. */
304 #define FLAGS_EOB 0x00010000 /**< server has sent us an EOB */
305 #define FLAGS_HIDDEN 0x00020000 /**< a hidden server. not shown in /links */
306 #define FLAGS_BLOCKED 0x00040000 /**< must wait for COMM_SELECT_WRITE */
307 #define FLAGS_USERHOST 0x00080000 /**< client is in userhost hash */
308 #define FLAGS_BURSTED 0x00100000 /**< user was already bursted */
309 #define FLAGS_EXEMPTRESV 0x00200000 /**< client is exempt from RESV */
310 #define FLAGS_GOTUSER 0x00400000 /**< if we received a USER command */
311 #define FLAGS_PINGWARNING 0x00800000 /**< unreplied ping warning already sent */
312 #define FLAGS_FINISHED_AUTH 0x01000000 /**< Client has been released from auth */
313 #define FLAGS_FLOOD_NOTICED 0x02000000 /**< Notice to opers about this flooder has been sent */
314 #define FLAGS_SERVICE 0x04000000 /**< Client/server is a network service */
315
316 #define HasFlag(x, y) ((x)->flags & (y))
317 #define AddFlag(x, y) ((x)->flags |= (y))
318 #define DelFlag(x, y) ((x)->flags &= ~(y))
319
320
321
322 /* umodes, settable flags */
323 #define UMODE_SERVNOTICE 0x00000001 /**< server notices such as kill */
324 #define UMODE_CCONN 0x00000002 /**< Client Connections */
325 #define UMODE_REJ 0x00000004 /**< Bot Rejections */
326 #define UMODE_SKILL 0x00000008 /**< Server Killed */
327 #define UMODE_FULL 0x00000010 /**< Full messages */
328 #define UMODE_SPY 0x00000020 /**< see STATS / LINKS */
329 #define UMODE_DEBUG 0x00000040 /**< 'debugging' info */
330 #define UMODE_NCHANGE 0x00000080 /**< Nick change notice */
331 #define UMODE_WALLOP 0x00000100 /**< send wallops to them */
332 #define UMODE_OPERWALL 0x00000200 /**< Operwalls */
333 #define UMODE_INVISIBLE 0x00000400 /**< makes user invisible */
334 #define UMODE_BOTS 0x00000800 /**< shows bots */
335 #define UMODE_EXTERNAL 0x00001000 /**< show servers introduced and splitting */
336 #define UMODE_CALLERID 0x00002000 /**< block unless caller id's */
337 #define UMODE_SOFTCALLERID 0x00004000 /**< block unless on common channel */
338 #define UMODE_UNAUTH 0x00008000 /**< show unauth connects here */
339 #define UMODE_LOCOPS 0x00010000 /**< show locops */
340 #define UMODE_DEAF 0x00020000 /**< don't receive channel messages */
341 #define UMODE_CCONN_FULL 0x00040000 /**< add unused fields to connection monitoring */
342 #define UMODE_REGISTERED 0x00080000 /**< User has identified for that nick. */
343 #define UMODE_REGONLY 0x00100000 /**< Only registered nicks may PM */
344 #define UMODE_HIDDEN 0x00200000 /**< Operator status is hidden */
345 #define UMODE_OPER 0x00400000 /**< Operator */
346 #define UMODE_ADMIN 0x00800000 /**< Admin on server */
347
348 #define UMODE_ALL UMODE_SERVNOTICE
349
350 #define HasUMode(x, y) ((x)->umodes & (y))
351 #define AddUMode(x, y) ((x)->umodes |= (y))
352 #define DelUMode(x, y) ((x)->umodes &= ~(y))
353
354 #define SEND_UMODES (UMODE_INVISIBLE | UMODE_OPER | UMODE_WALLOP | \
355 UMODE_REGISTERED | UMODE_ADMIN | UMODE_HIDDEN)
356
357
358
359 /* oper priv flags */
360 #define OPER_FLAG_GLOBAL_KILL 0x00000001 /**< Oper can global kill */
361 #define OPER_FLAG_REMOTE 0x00000002 /**> Oper can do squits/connects */
362 #define OPER_FLAG_UNKLINE 0x00000004 /**< Oper can use unkline */
363 #define OPER_FLAG_GLINE 0x00000008 /**< Oper can use gline */
364 #define OPER_FLAG_N 0x00000010 /**< Oper can umode n */
365 #define OPER_FLAG_K 0x00000020 /**< Oper can kill/kline */
366 #define OPER_FLAG_X 0x00000040 /**< Oper can xline */
367 #define OPER_FLAG_DIE 0x00000080 /**< Oper can die */
368 #define OPER_FLAG_REHASH 0x00000100 /**< Oper can rehash */
369 #define OPER_FLAG_ADMIN 0x00000200 /**< Oper can set umode +a */
370 #define OPER_FLAG_OPERWALL 0x00000400 /**< Oper can use OPERWALL command */
371 #define OPER_FLAG_OPER_SPY 0x00000800 /* */
372 #define OPER_FLAG_REMOTEBAN 0x00001000 /**< Oper can set remote bans */
373 #define OPER_FLAG_GLOBOPS 0x00002000 /**< Oper can use GLOBOPS command */
374 #define OPER_FLAG_MODULE 0x00004000 /**< Oper can use MODULE commands */
375 #define OPER_FLAG_RESTART 0x00008000 /**< Oper can use RESTART command */
376 #define OPER_FLAG_DLINE 0x00010000 /**< Oper can use DLINE command */
377 #define OPER_FLAG_UNDLINE 0x00020000 /**< Oper can use UNDLINE command */
378
379 #define HasOFlag(x, y) (MyConnect(x) ? (x)->localClient->operflags & (y) : 0)
380 #define AddOFlag(x, y) ((x)->localClient->operflags |= (y))
381 #define DelOFlag(x, y) ((x)->localClient->operflags &= ~(y))
382 #define ClrOFlag(x) ((x)->localClient->operflags = 0)
383
384
385
386 /* flags macros. */
387 #define IsAuthFinished(x) ((x)->flags & FLAGS_FINISHED_AUTH)
388 #define IsDead(x) ((x)->flags & FLAGS_DEADSOCKET)
389 #define SetDead(x) ((x)->flags |= FLAGS_DEADSOCKET)
390 #define IsClosing(x) ((x)->flags & FLAGS_CLOSING)
391 #define SetClosing(x) ((x)->flags |= FLAGS_CLOSING)
392 #define SetCanFlood(x) ((x)->flags |= FLAGS_CANFLOOD)
393 #define IsCanFlood(x) ((x)->flags & FLAGS_CANFLOOD)
394 #define IsDefunct(x) ((x)->flags & (FLAGS_DEADSOCKET|FLAGS_CLOSING| \
395 FLAGS_KILLED))
396
397 /* oper flags */
398 #define MyOper(x) (MyConnect(x) && HasUMode(x, UMODE_OPER))
399
400 #define SetOper(x) {(x)->umodes |= UMODE_OPER; \
401 if (!IsServer((x))) (x)->handler = OPER_HANDLER;}
402
403 #define ClearOper(x) {(x)->umodes &= ~(UMODE_OPER|UMODE_ADMIN); \
404 if (!HasUMode(x, UMODE_OPER) && !IsServer((x))) \
405 (x)->handler = CLIENT_HANDLER; }
406
407 #define SetSendQExceeded(x) ((x)->flags |= FLAGS_SENDQEX)
408 #define IsSendQExceeded(x) ((x)->flags & FLAGS_SENDQEX)
409
410 #define SetIpHash(x) ((x)->flags |= FLAGS_IPHASH)
411 #define ClearIpHash(x) ((x)->flags &= ~FLAGS_IPHASH)
412 #define IsIpHash(x) ((x)->flags & FLAGS_IPHASH)
413
414 #define SetUserHost(x) ((x)->flags |= FLAGS_USERHOST)
415 #define ClearUserHost(x) ((x)->flags &= ~FLAGS_USERHOST)
416 #define IsUserHostIp(x) ((x)->flags & FLAGS_USERHOST)
417
418 #define SetPingSent(x) ((x)->flags |= FLAGS_PINGSENT)
419 #define IsPingSent(x) ((x)->flags & FLAGS_PINGSENT)
420 #define ClearPingSent(x) ((x)->flags &= ~FLAGS_PINGSENT)
421
422 #define SetPingWarning(x) ((x)->flags |= FLAGS_PINGWARNING)
423 #define IsPingWarning(x) ((x)->flags & FLAGS_PINGWARNING)
424 #define ClearPingWarning(x) ((x)->flags &= ~FLAGS_PINGWARNING)
425
426 #define SetNeedId(x) ((x)->flags |= FLAGS_NEEDID)
427 #define IsNeedId(x) ((x)->flags & FLAGS_NEEDID)
428
429 #define SetGotId(x) ((x)->flags |= FLAGS_GOTID)
430 #define IsGotId(x) ((x)->flags & FLAGS_GOTID)
431
432 #define IsExemptKline(x) ((x)->flags & FLAGS_EXEMPTKLINE)
433 #define SetExemptKline(x) ((x)->flags |= FLAGS_EXEMPTKLINE)
434 #define IsExemptLimits(x) ((x)->flags & FLAGS_NOLIMIT)
435 #define SetExemptLimits(x) ((x)->flags |= FLAGS_NOLIMIT)
436 #define IsExemptGline(x) ((x)->flags & FLAGS_EXEMPTGLINE)
437 #define SetExemptGline(x) ((x)->flags |= FLAGS_EXEMPTGLINE)
438 #define IsExemptResv(x) ((x)->flags & FLAGS_EXEMPTRESV)
439 #define SetExemptResv(x) ((x)->flags |= FLAGS_EXEMPTRESV)
440 #define SetIPSpoof(x) ((x)->flags |= FLAGS_IP_SPOOFING)
441 #define IsIPSpoof(x) ((x)->flags & FLAGS_IP_SPOOFING)
442
443 #define IsFloodDone(x) ((x)->flags & FLAGS_FLOODDONE)
444 #define SetFloodDone(x) ((x)->flags |= FLAGS_FLOODDONE)
445 #define HasPingCookie(x) ((x)->flags & FLAGS_PING_COOKIE)
446 #define SetPingCookie(x) ((x)->flags |= FLAGS_PING_COOKIE)
447 #define IsHidden(x) ((x)->flags & FLAGS_HIDDEN)
448 #define SetHidden(x) ((x)->flags |= FLAGS_HIDDEN)
449
450 #define IsSendqBlocked(x) ((x)->flags & FLAGS_BLOCKED)
451 #define SetSendqBlocked(x) ((x)->flags |= FLAGS_BLOCKED)
452 #define ClearSendqBlocked(x) ((x)->flags &= ~FLAGS_BLOCKED)
453
454 #define IsCaptured(x) ((x)->handler == DUMMY_HANDLER)
455 #define SetCaptured(x) ((x)->handler = DUMMY_HANDLER)
456 #define ClearCaptured(x) ((x)->handler = CLIENT_HANDLER)
457
458
459 extern struct Client me;
460 extern dlink_list listing_client_list;
461 extern dlink_list global_client_list;
462
463 extern int accept_message(struct Client *, struct Client *);
464 extern struct split_nuh_item *find_accept(const char *, const char *,
465 const char *, struct Client *, int);
466 extern void del_accept(struct split_nuh_item *, struct Client *);
467 extern void del_all_accepts(struct Client *);
468 extern void exit_client(struct Client *, struct Client *, const char *);
469 extern void check_conf_klines(void);
470 extern void init_client(void);
471 extern void dead_link_on_write(struct Client *, int);
472 extern void dead_link_on_read(struct Client *, int);
473 extern void exit_aborted_clients(void);
474 extern void free_exited_clients(void);
475 extern struct Client *make_client(struct Client *);
476 extern struct Client *find_chasing(struct Client *, struct Client *, const char *, int *);
477 extern struct Client *find_person(const struct Client *const, const char *);
478 extern const char *get_client_name(const struct Client *, enum addr_mask_type);
479
480 #endif /* INCLUDED_client_h */

Properties

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svn:eol-style native
svn:keywords Id Revision