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/*
* charybdis: A useful ircd.
* client.h: The ircd client header.
*
* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
* Copyright (C) 1996-2002 Hybrid Development Team
* Copyright (C) 2002-2004 ircd-ratbox development team
* Copyright (C) 2005 William Pitcock and Jilles Tjoelker
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
* $Id: client.h 3446 2007-05-14 22:21:16Z jilles $
*/
#ifndef INCLUDED_client_h
#define INCLUDED_client_h
#include "config.h"
#if !defined(CONFIG_RATBOX_LEVEL_1)
#error Incorrect config.h for this revision of ircd.
#endif
#include "ircd_defs.h"
#include "linebuf.h"
#include "channel.h"
#include "res.h"
#include "snomask.h"
#include "irc_string.h"
#include "sprintf_irc.h"
#include "ircd.h"
#include "commio.h"
/* other structs */
struct Blacklist;
/* we store ipv6 ips for remote clients, so this needs to be v6 always */
#define HOSTIPLEN 53 /* sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255.ipv6") */
#define PASSWDLEN 128
#define CIPHERKEYLEN 64 /* 512bit */
#define CLIENT_BUFSIZE 512 /* must be at least 512 bytes */
#define IDLEN 10
/*
* pre declare structs
*/
struct ConfItem;
struct Whowas;
struct DNSReply;
struct Listener;
struct Client;
struct User;
struct Server;
struct LocalUser;
struct AuthRequest;
struct PreClient;
struct ListClient;
struct scache_entry;
/*
* Atheme's coding standards require that we use BSD-style user-defined types
* for stuff. Fun! --nenolod
*/
typedef struct User user_t;
typedef struct Server server_t;
typedef struct Client client_t;
typedef struct LocalUser local_user_t;
typedef struct Listener listener_t;
typedef struct DNSReply dns_reply_t;
typedef struct Whowas whowas_entry_t;
typedef struct ConfItem conf_item_t;
typedef struct AuthRequest auth_request_t;
typedef struct PreClient pre_client_t;
typedef struct ListClient list_client_t;
/*
* Client structures
*/
struct User
{
dlink_list channel; /* chain of channel pointer blocks */
dlink_list invited; /* chain of invite pointer blocks */
char *away; /* pointer to away message */
int refcnt; /* Number of times this block is referenced */
char suser[NICKLEN+1];
};
struct Server
{
user_t *user; /* who activated this connection */
char by[NICKLEN];
dlink_list servers;
dlink_list users;
int caps; /* capabilities bit-field */
char *fullcaps;
struct scache_entry *nameinfo;
};
struct SlinkRpl
{
int command;
int datalen;
int gotdatalen;
int readdata;
unsigned char *data;
};
struct ZipStats
{
unsigned long in;
unsigned long in_wire;
unsigned long out;
unsigned long out_wire;
unsigned long inK;
unsigned long inK_wire;
unsigned long outK;
unsigned long outK_wire;
double in_ratio;
double out_ratio;
};
struct Client
{
dlink_node node;
dlink_node lnode;
user_t *user; /* ...defined, if this is a User */
server_t *serv; /* ...defined, if this is a server */
client_t *servptr; /* Points to server this Client is on */
client_t *from; /* == self, if Local Client, *NEVER* NULL! */
whowas_entry_t *whowas; /* Pointers to whowas structs */
time_t tsinfo; /* TS on the nick, SVINFO on server */
unsigned int umodes; /* opers, normal users subset */
unsigned int flags; /* client flags */
unsigned int flags2; /* ugh. overflow */
unsigned int snomask; /* server notice mask */
int hopcount; /* number of servers to this 0 = local */
unsigned short status; /* Client type */
unsigned char handler; /* Handler index */
unsigned long serial; /* used to enforce 1 send per nick */
/* client->name is the unique name for a client nick or host */
char name[HOSTLEN + 1];
/*
* client->username is the username from ident or the USER message,
* If the client is idented the USER message is ignored, otherwise
* the username part of the USER message is put here prefixed with a
* tilde depending on the I:line, Once a client has registered, this
* field should be considered read-only.
*/
char username[USERLEN + 1]; /* client's username */
/*
* client->host contains the resolved name or ip address
* as a string for the user, it may be fiddled with for oper spoofing etc.
*/
char host[HOSTLEN + 1]; /* client's hostname */
char orighost[HOSTLEN + 1]; /* original hostname (before dynamic spoofing) */
char sockhost[HOSTIPLEN + 1]; /* clients ip */
char info[REALLEN + 1]; /* Free form additional client info */
char id[IDLEN]; /* UID/SID, unique on the network */
/* list of who has this client on their allow list, its counterpart
* is in LocalUser
*/
dlink_list on_allow_list;
local_user_t *localClient;
pre_client_t *preClient;
};
struct LocalUser
{
dlink_node tnode; /* This is the node for the local list type the client is on*/
/*
* The following fields are allocated only for local clients
* (directly connected to *this* server with a socket.
*/
/* Anti flooding part, all because of lamers... */
time_t last_join_time; /* when this client last
joined a channel */
time_t last_leave_time; /* when this client last
* left a channel */
int join_leave_count; /* count of JOIN/LEAVE in less than
MIN_JOIN_LEAVE_TIME seconds */
int oper_warn_count_down; /* warn opers of this possible
spambot every time this gets to 0 */
time_t last_caller_id_time;
time_t first_received_message_time;
int received_number_of_privmsgs;
int flood_noticed;
time_t lasttime; /* last time we parsed something */
time_t firsttime; /* time client was created */
/* Send and receive linebuf queues .. */
buf_head_t buf_sendq;
buf_head_t buf_recvq;
/*
* we want to use unsigned int here so the sizes have a better chance of
* staying the same on 64 bit machines. The current trend is to use
* I32LP64, (32 bit ints, 64 bit longs and pointers) and since ircd
* will NEVER run on an operating system where ints are less than 32 bits,
* it's a relatively safe bet to use ints. Since right shift operations are
* performed on these, it's not safe to allow them to become negative,
* which is possible for long running server connections. Unsigned values
* generally overflow gracefully. --Bleep
*/
unsigned int sendM; /* Statistics: protocol messages send */
unsigned int sendK; /* Statistics: total k-bytes send */
unsigned int receiveM; /* Statistics: protocol messages received */
unsigned int receiveK; /* Statistics: total k-bytes received */
unsigned short sendB; /* counters to count upto 1-k lots of bytes */
unsigned short receiveB; /* sent and received. */
listener_t *listener; /* listener accepted from */
conf_item_t *att_conf; /* attached conf */
struct server_conf *att_sconf;
struct irc_sockaddr_storage ip;
time_t last_nick_change;
int number_of_nick_changes;
/*
* XXX - there is no reason to save this, it should be checked when it's
* received and not stored, this is not used after registration
*
* agreed. lets get rid of it someday! --nenolod
*/
char *passwd;
char *opername; /* name of operator{} block being used or tried (challenge) */
char *challenge;
char *fullcaps;
int caps; /* capabilities bit-field */
fde_t *F; /* >= 0, for local clients */
/* time challenge response is valid for */
time_t chal_time;
int ctrlfd; /* For servers:
control fd used for sending commands
to servlink */
struct SlinkRpl slinkrpl; /* slink reply being parsed */
unsigned char *slinkq; /* sendq for control data */
int slinkq_ofs; /* ofset into slinkq */
int slinkq_len; /* length remaining after slinkq_ofs */
struct ZipStats zipstats;
time_t last_away; /* Away since... */
time_t last;
/* clients allowed to talk through +g */
dlink_list allow_list;
/* nicknames theyre monitoring */
dlink_list monitor_list;
/*
* Anti-flood stuff. We track how many messages were parsed and how
* many we were allowed in the current second, and apply a simple decay
* to avoid flooding.
* -- adrian
*/
int allow_read; /* how many we're allowed to read in this second */
int actually_read; /* how many we've actually read in this second */
int sent_parsed; /* how many messages we've parsed in this second */
time_t last_knock; /* time of last knock */
unsigned long random_ping;
auth_request_t *auth_request;
/* target change stuff */
void *targets[10]; /* targets were aware of */
unsigned int targinfo[2]; /* cyclic array, no in use */
time_t target_last; /* last time we cleared a slot */
list_client_t *safelist_data;
char *mangledhost; /* non-NULL if host mangling module loaded and
applicable to this client */
};
struct PreClient
{
char spoofnick[NICKLEN + 1];
char spoofuser[USERLEN + 1];
char spoofhost[HOSTLEN + 1];
char sasl_agent[IDLEN];
unsigned char sasl_out;
unsigned char sasl_complete;
dlink_list dnsbl_queries; /* list of struct BlacklistClient * */
struct Blacklist *dnsbl_listed; /* first dnsbl where it's listed */
};
struct ListClient
{
unsigned int hash_indice;
unsigned int users_min, users_max;
/* It would be nice to add other modifiers,
* but not for 1.1 --nenolod
*/
};
struct exit_client_hook
{
struct Client *client_p;
char exit_message[TOPICLEN];
};
/*
* status macros.
*/
#define STAT_CONNECTING 0x01
#define STAT_HANDSHAKE 0x02
#define STAT_ME 0x04
#define STAT_UNKNOWN 0x08
#define STAT_REJECT 0x10
#define STAT_SERVER 0x20
#define STAT_CLIENT 0x40
#define IsRegisteredUser(x) ((x)->status == STAT_CLIENT)
#define IsRegistered(x) (((x)->status > STAT_UNKNOWN) && ((x)->status != STAT_REJECT))
#define IsConnecting(x) ((x)->status == STAT_CONNECTING)
#define IsHandshake(x) ((x)->status == STAT_HANDSHAKE)
#define IsMe(x) ((x)->status == STAT_ME)
#define IsUnknown(x) ((x)->status == STAT_UNKNOWN)
#define IsServer(x) ((x)->status == STAT_SERVER)
#define IsClient(x) ((x)->status == STAT_CLIENT)
#define IsReject(x) ((x)->status == STAT_REJECT)
#define IsAnyServer(x) (IsServer(x) || IsHandshake(x) || IsConnecting(x))
#define IsOper(x) ((x)->umodes & UMODE_OPER)
#define IsAdmin(x) ((x)->umodes & UMODE_ADMIN)
#define SetReject(x) {(x)->status = STAT_REJECT; \
(x)->handler = UNREGISTERED_HANDLER; }
#define SetConnecting(x) {(x)->status = STAT_CONNECTING; \
(x)->handler = UNREGISTERED_HANDLER; }
#define SetHandshake(x) {(x)->status = STAT_HANDSHAKE; \
(x)->handler = UNREGISTERED_HANDLER; }
#define SetMe(x) {(x)->status = STAT_ME; \
(x)->handler = UNREGISTERED_HANDLER; }
#define SetUnknown(x) {(x)->status = STAT_UNKNOWN; \
(x)->handler = UNREGISTERED_HANDLER; }
#define SetServer(x) {(x)->status = STAT_SERVER; \
(x)->handler = SERVER_HANDLER; }
#define SetClient(x) {(x)->status = STAT_CLIENT; \
(x)->handler = IsOper((x)) ? \
OPER_HANDLER : CLIENT_HANDLER; }
#define SetRemoteClient(x) {(x)->status = STAT_CLIENT; \
(x)->handler = RCLIENT_HANDLER; }
#define STAT_CLIENT_PARSE (STAT_UNKNOWN | STAT_CLIENT)
#define STAT_SERVER_PARSE (STAT_CONNECTING | STAT_HANDSHAKE | STAT_SERVER)
#define PARSE_AS_CLIENT(x) ((x)->status & STAT_CLIENT_PARSE)
#define PARSE_AS_SERVER(x) ((x)->status & STAT_SERVER_PARSE)
/*
* ts stuff
*/
#define TS_CURRENT 6
#ifdef TS6_ONLY
#define TS_MIN 6
#else
#define TS_MIN 3
#endif
#define TS_DOESTS 0x10000000
#define DoesTS(x) ((x)->tsinfo & TS_DOESTS)
#define has_id(source) ((source)->id[0] != '\0')
#define use_id(source) ((source)->id[0] != '\0' ? (source)->id : (source)->name)
/* if target is TS6, use id if it has one, else name */
#define get_id(source, target) ((IsServer(target->from) && has_id(target->from)) ? \
use_id(source) : (source)->name)
/* housekeeping flags */
#define FLAGS_PINGSENT 0x0001 /* Unreplied ping sent */
#define FLAGS_DEAD 0x0002 /* Local socket is dead--Exiting soon */
#define FLAGS_KILLED 0x0004 /* Prevents "QUIT" from being sent for this */
#define FLAGS_SENTUSER 0x0008 /* Client sent a USER command. */
#define FLAGS_CLICAP 0x0010 /* In CAP negotiation, wait for CAP END */
#define FLAGS_CLOSING 0x0020 /* set when closing to suppress errors */
#define FLAGS_PING_COOKIE 0x0040 /* has sent ping cookie */
#define FLAGS_GOTID 0x0080 /* successful ident lookup achieved */
#define FLAGS_FLOODDONE 0x0100 /* flood grace period over / reported */
#define FLAGS_NORMALEX 0x0400 /* Client exited normally */
#define FLAGS_SENDQEX 0x0800 /* Sendq exceeded */
#define FLAGS_SERVLINK 0x10000 /* servlink has servlink process */
#define FLAGS_MARK 0x20000 /* marked client */
#define FLAGS_HIDDEN 0x40000 /* hidden server */
#define FLAGS_EOB 0x80000 /* EOB */
#define FLAGS_MYCONNECT 0x100000 /* MyConnect */
#define FLAGS_IOERROR 0x200000 /* IO error */
#define FLAGS_SERVICE 0x400000 /* network service */
#define FLAGS_TGCHANGE 0x800000 /* we're allowed to clear something */
#define FLAGS_DYNSPOOF 0x1000000 /* dynamic spoof, only opers see ip */
#define FLAGS_EXUNKNOWN 0x2000000 /* too many unknowns exit.. */
/* umodes, settable flags */
/* lots of this moved to snomask -- jilles */
#define UMODE_SERVNOTICE 0x0001 /* server notices */
#define UMODE_WALLOP 0x0100 /* send wallops to them */
#define UMODE_OPERWALL 0x0200 /* Operwalls */
#define UMODE_INVISIBLE 0x0400 /* makes user invisible */
#define UMODE_CALLERID 0x2000 /* block unless caller id's */
#define UMODE_LOCOPS 0x8000 /* show locops */
#define UMODE_SERVICE 0x40000
#define UMODE_DEAF 0x80000
#define UMODE_NOFORWARD 0x400000 /* don't forward */
#define UMODE_REGONLYMSG 0x800000 /* only allow logged in users to msg */
/* user information flags, only settable by remote mode or local oper */
#define UMODE_OPER 0x100000 /* Operator */
#define UMODE_ADMIN 0x200000 /* Admin on server */
#define UMODE_ALL UMODE_SERVNOTICE
/* overflow flags */
/* EARLIER FLAGS ARE IN s_newconf.h */
#define FLAGS2_EXEMPTRESV 0x00400000
#define FLAGS2_EXEMPTGLINE 0x00800000
#define FLAGS2_EXEMPTKLINE 0x01000000
#define FLAGS2_EXEMPTFLOOD 0x02000000
#define FLAGS2_NOLIMIT 0x04000000
#define FLAGS2_IDLE_LINED 0x08000000
#define FLAGS2_IP_SPOOFING 0x10000000
#define FLAGS2_EXEMPTSPAMBOT 0x20000000
#define FLAGS2_EXEMPTSHIDE 0x40000000
#define FLAGS2_EXEMPTJUPE 0x80000000
#define DEFAULT_OPER_UMODES (UMODE_SERVNOTICE | UMODE_OPERWALL | \
UMODE_WALLOP | UMODE_LOCOPS)
#define DEFAULT_OPER_SNOMASK SNO_GENERAL
#define CLICAP_MULTI_PREFIX 0x0001
#define CLICAP_SASL 0x0002
/*
* flags macros.
*/
#define IsPerson(x) (IsClient(x) && (x)->user != NULL)
#define HasServlink(x) ((x)->flags & FLAGS_SERVLINK)
#define SetServlink(x) ((x)->flags |= FLAGS_SERVLINK)
#define MyConnect(x) ((x)->flags & FLAGS_MYCONNECT)
#define SetMyConnect(x) ((x)->flags |= FLAGS_MYCONNECT)
#define ClearMyConnect(x) ((x)->flags &= ~FLAGS_MYCONNECT)
#define MyClient(x) (MyConnect(x) && IsClient(x))
#define SetMark(x) ((x)->flags |= FLAGS_MARK)
#define ClearMark(x) ((x)->flags &= ~FLAGS_MARK)
#define IsMarked(x) ((x)->flags & FLAGS_MARK)
#define SetHidden(x) ((x)->flags |= FLAGS_HIDDEN)
#define ClearHidden(x) ((x)->flags &= ~FLAGS_HIDDEN)
#define IsHidden(x) ((x)->flags & FLAGS_HIDDEN)
#define ClearEob(x) ((x)->flags &= ~FLAGS_EOB)
#define SetEob(x) ((x)->flags |= FLAGS_EOB)
#define HasSentEob(x) ((x)->flags & FLAGS_EOB)
#define IsDead(x) ((x)->flags & FLAGS_DEAD)
#define SetDead(x) ((x)->flags |= FLAGS_DEAD)
#define IsClosing(x) ((x)->flags & FLAGS_CLOSING)
#define SetClosing(x) ((x)->flags |= FLAGS_CLOSING)
#define IsIOError(x) ((x)->flags & FLAGS_IOERROR)
#define SetIOError(x) ((x)->flags |= FLAGS_IOERROR)
#define IsAnyDead(x) (IsIOError(x) || IsDead(x) || IsClosing(x))
#define IsTGChange(x) ((x)->flags & FLAGS_TGCHANGE)
#define SetTGChange(x) ((x)->flags |= FLAGS_TGCHANGE)
#define ClearTGChange(x) ((x)->flags &= ~FLAGS_TGCHANGE)
#define IsDynSpoof(x) ((x)->flags & FLAGS_DYNSPOOF)
#define SetDynSpoof(x) ((x)->flags |= FLAGS_DYNSPOOF)
#define ClearDynSpoof(x) ((x)->flags &= ~FLAGS_DYNSPOOF)
#define IsExUnknown(x) ((x)->flags & FLAGS_EXUNKNOWN)
#define SetExUnknown(x) ((x)->flags |= FLAGS_EXUNKNOWN)
/* oper flags */
#define MyOper(x) (MyConnect(x) && IsOper(x))
#define SetOper(x) {(x)->umodes |= UMODE_OPER; \
if (MyClient((x))) (x)->handler = OPER_HANDLER;}
#define ClearOper(x) {(x)->umodes &= ~(UMODE_OPER|UMODE_ADMIN); \
if (MyClient((x)) && !IsOper((x)) && !IsServer((x))) \
(x)->handler = CLIENT_HANDLER; }
/* umode flags */
#define IsInvisible(x) ((x)->umodes & UMODE_INVISIBLE)
#define SetInvisible(x) ((x)->umodes |= UMODE_INVISIBLE)
#define ClearInvisible(x) ((x)->umodes &= ~UMODE_INVISIBLE)
#define SendWallops(x) ((x)->umodes & UMODE_WALLOP)
#define SendLocops(x) ((x)->umodes & UMODE_LOCOPS)
#define SendServNotice(x) ((x)->umodes & UMODE_SERVNOTICE)
#define SendOperwall(x) ((x)->umodes & UMODE_OPERWALL)
#define IsSetCallerId(x) ((x)->umodes & UMODE_CALLERID)
#define IsService(x) ((x)->umodes & UMODE_SERVICE)
#define IsDeaf(x) ((x)->umodes & UMODE_DEAF)
#define IsNoForward(x) ((x)->umodes & UMODE_NOFORWARD)
#define IsSetRegOnlyMsg(x) ((x)->umodes & UMODE_REGONLYMSG)
#define SetGotId(x) ((x)->flags |= FLAGS_GOTID)
#define IsGotId(x) (((x)->flags & FLAGS_GOTID) != 0)
/*
* flags2 macros.
*/
#define IsExemptKline(x) ((x)->flags2 & FLAGS2_EXEMPTKLINE)
#define SetExemptKline(x) ((x)->flags2 |= FLAGS2_EXEMPTKLINE)
#define IsExemptLimits(x) ((x)->flags2 & FLAGS2_NOLIMIT)
#define SetExemptLimits(x) ((x)->flags2 |= FLAGS2_NOLIMIT)
#define IsExemptGline(x) ((x)->flags2 & FLAGS2_EXEMPTGLINE)
#define SetExemptGline(x) ((x)->flags2 |= FLAGS2_EXEMPTGLINE)
#define IsExemptFlood(x) ((x)->flags2 & FLAGS2_EXEMPTFLOOD)
#define SetExemptFlood(x) ((x)->flags2 |= FLAGS2_EXEMPTFLOOD)
#define IsExemptSpambot(x) ((x)->flags2 & FLAGS2_EXEMPTSPAMBOT)
#define SetExemptSpambot(x) ((x)->flags2 |= FLAGS2_EXEMPTSPAMBOT)
#define IsExemptShide(x) ((x)->flags2 & FLAGS2_EXEMPTSHIDE)
#define SetExemptShide(x) ((x)->flags2 |= FLAGS2_EXEMPTSHIDE)
#define IsExemptJupe(x) ((x)->flags2 & FLAGS2_EXEMPTJUPE)
#define SetExemptJupe(x) ((x)->flags2 |= FLAGS2_EXEMPTJUPE)
#define IsExemptResv(x) ((x)->flags2 & FLAGS2_EXEMPTRESV)
#define SetExemptResv(x) ((x)->flags2 |= FLAGS2_EXEMPTRESV)
#define IsIPSpoof(x) ((x)->flags2 & FLAGS2_IP_SPOOFING)
#define SetIPSpoof(x) ((x)->flags2 |= FLAGS2_IP_SPOOFING)
#define SetIdlelined(x) ((x)->flags2 |= FLAGS2_IDLE_LINED)
#define IsIdlelined(x) ((x)->flags2 & FLAGS2_IDLE_LINED)
/* for local users: flood grace period is over
* for servers: mentioned in networknotice.c notice
*/
#define IsFloodDone(x) ((x)->flags & FLAGS_FLOODDONE)
#define SetFloodDone(x) ((x)->flags |= FLAGS_FLOODDONE)
/*
* definitions for get_client_name
*/
#define HIDE_IP 0
#define SHOW_IP 1
#define MASK_IP 2
extern void check_banned_lines(void);
extern void check_klines_event(void *unused);
extern void check_klines(void);
extern void check_glines(void);
extern void check_dlines(void);
extern void check_xlines(void);
extern const char *get_client_name(struct Client *client, int show_ip);
extern const char *get_server_name(struct Client *client, int show_ip);
extern const char *log_client_name(struct Client *, int);
extern int is_remote_connect(struct Client *);
extern void init_client(void);
extern client_t *make_client(struct Client *from);
extern void free_pre_client(struct Client *client);
extern void free_client(struct Client *client);
extern int exit_client(struct Client *, struct Client *, struct Client *, const char *);
extern void error_exit_client(struct Client *, int);
extern void count_local_client_memory(size_t * count, size_t * memory);
extern void count_remote_client_memory(size_t * count, size_t * memory);
extern client_t *find_chasing(struct Client *, const char *, int *);
extern client_t *find_person(const char *);
extern client_t *find_named_person(const char *);
extern client_t *next_client(struct Client *, const char *);
#define accept_message(s, t) ((s) == (t) || (dlinkFind((s), &((t)->localClient->allow_list))))
extern void del_all_accepts(struct Client *client_p);
extern void dead_link(struct Client *client_p);
extern int show_ip(struct Client *source_p, struct Client *target_p);
extern int show_ip_conf(struct ConfItem *aconf, struct Client *target_p);
extern void initUser(void);
extern void free_user(struct User *, struct Client *);
extern user_t *make_user(struct Client *);
extern server_t *make_server(struct Client *);
extern void close_connection(struct Client *);
extern void init_uid(void);
extern char *generate_uid(void);
#endif /* INCLUDED_client_h */
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