X-Git-Url: https://arthur.barton.de/cgi-bin/gitweb.cgi?p=ngircd-alex.git;a=blobdiff_plain;f=src%2Fngircd%2Fclient.c;h=474ae4b6460c4be738b90e723065885ffa0a51ad;hp=41fedfae2ebe8563dede4d071219eef0972ed2b0;hb=001c00b27312289e40425db19ce9f7d957ffbbba;hpb=9067612941175a8e0d074eace961708c5c7aa655

diff --git a/src/ngircd/client.c b/src/ngircd/client.c
index 41fedfae..474ae4b6 100644
--- a/src/ngircd/client.c
+++ b/src/ngircd/client.c
@@ -1,73 +1,87 @@
 /*
  * ngIRCd -- The Next Generation IRC Daemon
- * Copyright (c)2001 by Alexander Barton (alex@barton.de)
+ * Copyright (c)2001-2005 by Alexander Barton (alex@barton.de)
  *
- * Dieses Programm ist freie Software. Sie koennen es unter den Bedingungen
- * der GNU General Public License (GPL), wie von der Free Software Foundation
- * herausgegeben, weitergeben und/oder modifizieren, entweder unter Version 2
- * der Lizenz oder (wenn Sie es wuenschen) jeder spaeteren Version.
- * Naehere Informationen entnehmen Sie bitter der Datei COPYING. Eine Liste
- * der an comBase beteiligten Autoren finden Sie in der Datei AUTHORS.
- *
- * $Id: client.c,v 1.6 2001/12/26 03:19:16 alex Exp $
- *
- * client.c: Management aller Clients
- *
- * Der Begriff "Client" ist in diesem Fall evtl. etwas verwirrend: Clients sind
- * alle Verbindungen, die im gesamten(!) IRC-Netzwerk bekannt sind. Das sind IRC-
- * Clients (User), andere Server und IRC-Services.
- * Ueber welchen IRC-Server die Verbindung nun tatsaechlich in das Netzwerk her-
- * gestellt wurde, muss der jeweiligen Struktur entnommen werden. Ist es dieser
- * Server gewesen, so existiert eine entsprechende CONNECTION-Struktur.
- *
- * $Log: client.c,v $
- * Revision 1.6  2001/12/26 03:19:16  alex
- * - neue Funktion Client_Name().
- *
- * Revision 1.5  2001/12/25 22:04:26  alex
- * - Aenderungen an den Debug- und Logging-Funktionen.
- *
- * Revision 1.4  2001/12/25 19:21:26  alex
- * - Client-Typ ("Status") besser unterteilt, My_Clients ist zudem nun global.
- *
- * Revision 1.3  2001/12/24 01:31:14  alex
- * - einige assert()'s eingestraeut.
- *
- * Revision 1.2  2001/12/23 22:04:37  alex
- * - einige neue Funktionen,
- * - CLIENT-Struktur erweitert.
- *
- * Revision 1.1  2001/12/14 08:13:43  alex
- * - neues Modul begonnen :-)
+ * 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.
+ * Please read the file COPYING, README and AUTHORS for more information.
  *
+ * Client management.
  */
 
 
-#include <portab.h>
-#include "global.h"
+#define __client_c__
 
-#include <imp.h>
+
+#include "portab.h"
+
+static char UNUSED id[] = "$Id: client.c,v 1.96 2007/10/25 11:01:19 fw Exp $";
+
+#include "imp.h"
 #include <assert.h>
 #include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
+#include <strings.h>
+#include <netdb.h>
 
-#include "channel.h"
+#include "defines.h"
 #include "conn.h"
+
+#include "exp.h"
+#include "client.h"
+
+#include <imp.h>
+#include "ngircd.h"
+#include "channel.h"
+#include "resolve.h"
+#include "conf.h"
+#include "hash.h"
+#include "irc-write.h"
 #include "log.h"
+#include "messages.h"
 
 #include <exp.h>
-#include "client.h"
 
 
-LOCAL CLIENT *New_Client_Struct( VOID );
+#define GETID_LEN (CLIENT_NICK_LEN-1) + 1 + (CLIENT_USER_LEN-1) + 1 + (CLIENT_HOST_LEN-1) + 1
+
+
+static CLIENT *This_Server, *My_Clients;
+static char GetID_Buffer[GETID_LEN];
+
+static WHOWAS My_Whowas[MAX_WHOWAS];
+static int Last_Whowas = -1;
+
+
+static unsigned long Count PARAMS(( CLIENT_TYPE Type ));
+static unsigned long MyCount PARAMS(( CLIENT_TYPE Type ));
+
+static CLIENT *New_Client_Struct PARAMS(( void ));
+static void Generate_MyToken PARAMS(( CLIENT *Client ));
+static void Adjust_Counters PARAMS(( CLIENT *Client ));
+
+static CLIENT *Init_New_Client PARAMS((CONN_ID Idx, CLIENT *Introducer,
+ CLIENT *TopServer, int Type, char *ID, char *User, char *Hostname,
+ char *Info, int Hops, int Token, char *Modes, bool Idented));
 
 
-GLOBAL VOID Client_Init( VOID )
+long Max_Users = 0, My_Max_Users = 0;
+
+
+GLOBAL void
+Client_Init( void )
 {
+	struct hostent *h;
+	
 	This_Server = New_Client_Struct( );
 	if( ! This_Server )
 	{
 		Log( LOG_EMERG, "Can't allocate client structure for server! Going down." );
+		Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME );
 		exit( 1 );
 	}
 
@@ -76,139 +90,1057 @@ GLOBAL VOID Client_Init( VOID )
 	This_Server->type = CLIENT_SERVER;
 	This_Server->conn_id = NONE;
 	This_Server->introducer = This_Server;
+	This_Server->mytoken = 1;
+	This_Server->hops = 0;
+
 	gethostname( This_Server->host, CLIENT_HOST_LEN );
-	strcpy( This_Server->nick, This_Server->host );
+	if (!Conf_NoDNS) {
+		h = gethostbyname( This_Server->host );
+		if (h) strlcpy(This_Server->host, h->h_name, sizeof(This_Server->host));
+	}
+	Client_SetID( This_Server, Conf_ServerName );
+	Client_SetInfo( This_Server, Conf_ServerInfo );
 
 	My_Clients = This_Server;
+	
+	memset( &My_Whowas, 0, sizeof( My_Whowas ));
 } /* Client_Init */
 
 
-GLOBAL VOID Client_Exit( VOID )
+GLOBAL void
+Client_Exit( void )
 {
 	CLIENT *c, *next;
-	INT cnt;
+	int cnt;
 
-	Client_Destroy( This_Server );
+	if( NGIRCd_SignalRestart ) Client_Destroy( This_Server, "Server going down (restarting).", NULL, false );
+	else Client_Destroy( This_Server, "Server going down.", NULL, false );
 	
 	cnt = 0;
 	c = My_Clients;
 	while( c )
 	{
 		cnt++;
-		next = c->next;
+		next = (CLIENT *)c->next;
 		free( c );
 		c = next;
 	}
 	if( cnt ) Log( LOG_INFO, "Freed %d client structure%s.", cnt, cnt == 1 ? "" : "s" );
-} /* Client Exit */
+} /* Client_Exit */
 
 
-GLOBAL CLIENT *Client_New_Local( CONN_ID Idx, CHAR *Hostname )
+GLOBAL CLIENT *
+Client_ThisServer( void )
+{
+	return This_Server;
+} /* Client_ThisServer */
+
+
+/**
+ * Initialize new local client; wrapper function for Init_New_Client().
+ * @return New CLIENT structure.
+ */
+GLOBAL CLIENT *
+Client_NewLocal(CONN_ID Idx, char *Hostname, int Type, bool Idented)
+{
+	return Init_New_Client(Idx, This_Server, NULL, Type, NULL, NULL,
+		Hostname, NULL, 0, 0, NULL, Idented);
+} /* Client_NewLocal */
+
+
+/**
+ * Initialize new remote server; wrapper function for Init_New_Client().
+ * @return New CLIENT structure.
+ */
+GLOBAL CLIENT *
+Client_NewRemoteServer(CLIENT *Introducer, char *Hostname, CLIENT *TopServer,
+ int Hops, int Token, char *Info, bool Idented)
+{
+	return Init_New_Client(NONE, Introducer, TopServer, CLIENT_SERVER,
+		Hostname, NULL, Hostname, Info, Hops, Token, NULL, Idented);
+} /* Client_NewRemoteServer */
+
+
+/**
+ * Initialize new remote client; wrapper function for Init_New_Client().
+ * @return New CLIENT structure.
+ */
+GLOBAL CLIENT *
+Client_NewRemoteUser(CLIENT *Introducer, char *Nick, int Hops, char *User,
+ char *Hostname, int Token, char *Modes, char *Info, bool Idented)
+{
+	return Init_New_Client(NONE, Introducer, NULL, CLIENT_USER, Nick,
+		User, Hostname, Info, Hops, Token, Modes, Idented);
+} /* Client_NewRemoteUser */
+
+
+/**
+ * Initialize new client and set up the given parameters like client type,
+ * user name, host name, introducing server etc. ...
+ * @return New CLIENT structure.
+ */
+static CLIENT *
+Init_New_Client(CONN_ID Idx, CLIENT *Introducer, CLIENT *TopServer,
+ int Type, char *ID, char *User, char *Hostname, char *Info, int Hops,
+ int Token, char *Modes, bool Idented)
 {
-	/* Neuen lokalen Client erzeugen. */
-	
 	CLIENT *client;
 
-	assert( Idx >= 0 );
+	assert( Idx >= NONE );
+	assert( Introducer != NULL );
 	assert( Hostname != NULL );
-	
+
 	client = New_Client_Struct( );
 	if( ! client ) return NULL;
 
-	/* Initgialisieren */
+	/* Initialisieren */
+	client->starttime = time(NULL);
 	client->conn_id = Idx;
-	client->introducer = This_Server;
-	strncpy( client->host, Hostname, CLIENT_HOST_LEN );
-	client->host[CLIENT_HOST_LEN] = '\0';
+	client->introducer = Introducer;
+	client->topserver = TopServer;
+	client->type = Type;
+	if( ID ) Client_SetID( client, ID );
+	if( User ) Client_SetUser( client, User, Idented );
+	if( Hostname ) Client_SetHostname( client, Hostname );
+	if( Info ) Client_SetInfo( client, Info );
+	client->hops = Hops;
+	client->token = Token;
+	if( Modes ) Client_SetModes( client, Modes );
+	if( Type == CLIENT_SERVER ) Generate_MyToken( client );
+
+	if( strchr( client->modes, 'a' ))
+		strlcpy( client->away, DEFAULT_AWAY_MSG, sizeof( client->away ));
 
 	/* Verketten */
-	client->next = My_Clients;
+	client->next = (POINTER *)My_Clients;
 	My_Clients = client;
-	
+
+	/* Adjust counters */
+	Adjust_Counters( client );
+
 	return client;
-} /* Client_New_Local */
+} /* Init_New_Client */
 
 
-GLOBAL VOID Client_Destroy( CLIENT *Client )
+GLOBAL void
+Client_Destroy( CLIENT *Client, char *LogMsg, char *FwdMsg, bool SendQuit )
 {
 	/* Client entfernen. */
 	
 	CLIENT *last, *c;
+	char msg[LINE_LEN], *txt;
 
 	assert( Client != NULL );
-	
+
+	if( LogMsg ) txt = LogMsg;
+	else txt = FwdMsg;
+	if( ! txt ) txt = "Reason unknown.";
+
+	/* Netz-Split-Nachricht vorbereiten (noch nicht optimal) */
+	if( Client->type == CLIENT_SERVER ) {
+		strlcpy(msg, This_Server->id, sizeof (msg));
+		strlcat(msg, " ", sizeof (msg));
+		strlcat(msg, Client->id, sizeof (msg));
+	}
+
 	last = NULL;
 	c = My_Clients;
 	while( c )
 	{
+		if(( Client->type == CLIENT_SERVER ) && ( c->introducer == Client ) && ( c != Client ))
+		{
+			/* der Client, der geloescht wird ist ein Server. Der Client, den wir gerade
+			 * pruefen, ist ein Child von diesem und muss daher auch entfernt werden */
+			Client_Destroy( c, NULL, msg, false );
+			last = NULL;
+			c = My_Clients;
+			continue;
+		}
 		if( c == Client )
 		{
+			/* Wir haben den Client gefunden: entfernen */
 			if( last ) last->next = c->next;
-			else My_Clients = c->next;
+			else My_Clients = (CLIENT *)c->next;
+
+			if( c->type == CLIENT_USER )
+			{
+				if( c->conn_id != NONE )
+				{
+					/* Ein lokaler User */
+					Log( LOG_NOTICE, "User \"%s\" unregistered (connection %d): %s", Client_Mask( c ), c->conn_id, txt );
+
+					if( SendQuit )
+					{
+						/* Alle andere Server informieren! */
+						if( FwdMsg ) IRC_WriteStrServersPrefix( NULL, c, "QUIT :%s", FwdMsg );
+						else IRC_WriteStrServersPrefix( NULL, c, "QUIT :" );
+					}
+				}
+				else
+				{
+					/* Remote User */
+					Log( LOG_DEBUG, "User \"%s\" unregistered: %s", Client_Mask( c ), txt );
+
+					if( SendQuit )
+					{
+						/* Andere Server informieren, ausser denen, die "in
+						 * Richtung dem liegen", auf dem der User registriert
+						 * ist. Von denen haben wir das QUIT ja wohl bekommen. */
+						if( FwdMsg ) IRC_WriteStrServersPrefix( Client_NextHop( c ), c, "QUIT :%s", FwdMsg );
+						else IRC_WriteStrServersPrefix( Client_NextHop( c ), c, "QUIT :" );
+					}
+				}
+
+				/* Unregister client from channels */
+				Channel_Quit( c, FwdMsg ? FwdMsg : c->id );
+				
+				/* Register client in My_Whowas structure */
+				Client_RegisterWhowas( c );
+			}
+			else if( c->type == CLIENT_SERVER )
+			{
+				if( c != This_Server )
+				{
+					if( c->conn_id != NONE ) Log( LOG_NOTICE|LOG_snotice, "Server \"%s\" unregistered (connection %d): %s", c->id, c->conn_id, txt );
+					else Log( LOG_NOTICE|LOG_snotice, "Server \"%s\" unregistered: %s", c->id, txt );
+				}
+
+				/* andere Server informieren */
+				if( ! NGIRCd_SignalQuit )
+				{
+					if( FwdMsg ) IRC_WriteStrServersPrefix( Client_NextHop( c ), c, "SQUIT %s :%s", c->id, FwdMsg );
+					else IRC_WriteStrServersPrefix( Client_NextHop( c ), c, "SQUIT %s :", c->id );
+				}
+			}
+			else
+			{
+				if( c->conn_id != NONE )
+				{
+					if( c->id[0] ) Log( LOG_NOTICE, "Client \"%s\" unregistered (connection %d): %s", c->id, c->conn_id, txt );
+					else Log( LOG_NOTICE, "Client unregistered (connection %d): %s", c->conn_id, txt );
+				} else {
+					Log(LOG_WARNING, "Unregistered unknown client \"%s\": %s",
+								c->id[0] ? c->id : "(No Nick)", txt );
+				}
+			}
+
 			free( c );
 			break;
 		}
 		last = c;
-		c = c->next;
+		c = (CLIENT *)c->next;
 	}
 } /* Client_Destroy */
 
 
-GLOBAL CLIENT *Client_GetFromConn( CONN_ID Idx )
+GLOBAL void
+Client_SetHostname( CLIENT *Client, char *Hostname )
 {
-	/* Client-Struktur, die zur lokalen Verbindung Idx gehoert
-	 * liefern. Wird keine gefunden, so wird NULL geliefert. */
+	/* Hostname eines Clients setzen */
+
+	assert( Client != NULL );
+	assert( Hostname != NULL );
+
+	strlcpy( Client->host, Hostname, sizeof( Client->host ));
+} /* Client_SetHostname */
 
-	CLIENT *c;
 
-	assert( Idx >= 0 );
+GLOBAL void
+Client_SetID( CLIENT *Client, char *ID )
+{
+	/* Hostname eines Clients setzen, Hash-Wert berechnen */
+
+	assert( Client != NULL );
+	assert( ID != NULL );
 	
+	strlcpy( Client->id, ID, sizeof( Client->id ));
+
+	/* Hash */
+	Client->hash = Hash( Client->id );
+} /* Client_SetID */
+
+
+GLOBAL void
+Client_SetUser( CLIENT *Client, char *User, bool Idented )
+{
+	/* Username eines Clients setzen */
+
+	assert( Client != NULL );
+	assert( User != NULL );
+
+	if( Idented ) strlcpy( Client->user, User, sizeof( Client->user ));
+	else
+	{
+		Client->user[0] = '~';
+		strlcpy( Client->user + 1, User, sizeof( Client->user ) - 1 );
+	}
+} /* Client_SetUser */
+
+
+GLOBAL void
+Client_SetInfo( CLIENT *Client, char *Info )
+{
+	/* Hostname eines Clients setzen */
+
+	assert( Client != NULL );
+	assert( Info != NULL );
+
+	strlcpy( Client->info, Info, sizeof( Client->info ));
+} /* Client_SetInfo */
+
+
+GLOBAL void
+Client_SetModes( CLIENT *Client, char *Modes )
+{
+	/* Modes eines Clients setzen */
+
+	assert( Client != NULL );
+	assert( Modes != NULL );
+
+	strlcpy( Client->modes, Modes, sizeof( Client->modes ));
+} /* Client_SetModes */
+
+
+GLOBAL void
+Client_SetFlags( CLIENT *Client, char *Flags )
+{
+	/* Flags eines Clients setzen */
+
+	assert( Client != NULL );
+	assert( Flags != NULL );
+
+	strlcpy( Client->flags, Flags, sizeof( Client->flags ));
+} /* Client_SetFlags */
+
+
+GLOBAL void
+Client_SetPassword( CLIENT *Client, char *Pwd )
+{
+	/* Von einem Client geliefertes Passwort */
+
+	assert( Client != NULL );
+	assert( Pwd != NULL );
+
+	strlcpy( Client->pwd, Pwd, sizeof( Client->pwd ));
+} /* Client_SetPassword */
+
+
+GLOBAL void
+Client_SetAway( CLIENT *Client, char *Txt )
+{
+	/* Set AWAY reason of client */
+
+	assert( Client != NULL );
+	assert( Txt != NULL );
+
+	strlcpy( Client->away, Txt, sizeof( Client->away ));
+	Log( LOG_DEBUG, "User \"%s\" is away: %s", Client_Mask( Client ), Txt );
+} /* Client_SetAway */
+
+
+GLOBAL void
+Client_SetType( CLIENT *Client, int Type )
+{
+	assert( Client != NULL );
+	Client->type = Type;
+	if( Type == CLIENT_SERVER ) Generate_MyToken( Client );
+	Adjust_Counters( Client );
+} /* Client_SetType */
+
+
+GLOBAL void
+Client_SetHops( CLIENT *Client, int Hops )
+{
+	assert( Client != NULL );
+	Client->hops = Hops;
+} /* Client_SetHops */
+
+
+GLOBAL void
+Client_SetToken( CLIENT *Client, int Token )
+{
+	assert( Client != NULL );
+	Client->token = Token;
+} /* Client_SetToken */
+
+
+GLOBAL void
+Client_SetIntroducer( CLIENT *Client, CLIENT *Introducer )
+{
+	assert( Client != NULL );
+	assert( Introducer != NULL );
+	Client->introducer = Introducer;
+} /* Client_SetIntroducer */
+
+
+GLOBAL void
+Client_SetOperByMe( CLIENT *Client, bool OperByMe )
+{
+	assert( Client != NULL );
+	Client->oper_by_me = OperByMe;
+} /* Client_SetOperByMe */
+
+
+GLOBAL bool
+Client_ModeAdd( CLIENT *Client, char Mode )
+{
+	/* Set Mode.
+	 * If Client already alread had Mode, return false.
+	 * If the Mode was newly set, return true.
+	 */
+
+	char x[2];
+
+	assert( Client != NULL );
+
+	x[0] = Mode; x[1] = '\0';
+	if( ! strchr( Client->modes, x[0] ))
+	{
+		/* Client hat den Mode noch nicht -> setzen */
+		strlcat( Client->modes, x, sizeof( Client->modes ));
+		return true;
+	}
+	else return false;
+} /* Client_ModeAdd */
+
+
+GLOBAL bool
+Client_ModeDel( CLIENT *Client, char Mode )
+{
+	/* Delete Mode.
+	 * If Mode was removed, return true.
+	 * If Client did not have Mode, return false.
+	 */
+
+	char x[2], *p;
+
+	assert( Client != NULL );
+
+	x[0] = Mode; x[1] = '\0';
+
+	p = strchr( Client->modes, x[0] );
+	if( ! p ) return false;
+
+	/* Client has Mode -> delete */
+	while( *p )
+	{
+		*p = *(p + 1);
+		p++;
+	}
+	return true;
+} /* Client_ModeDel */
+
+
+GLOBAL CLIENT *
+Client_Search( char *Nick )
+{
+	/* return Client-Structure that has the corresponding Nick.
+	 * If none is found, return NULL.
+	 */
+
+	char search_id[CLIENT_ID_LEN], *ptr;
+	CLIENT *c = NULL;
+	UINT32 search_hash;
+
+	assert( Nick != NULL );
+
+	/* copy Nick and truncate hostmask if necessary */
+	strlcpy( search_id, Nick, sizeof( search_id ));
+	ptr = strchr( search_id, '!' );
+	if( ptr ) *ptr = '\0';
+
+	search_hash = Hash( search_id );
+
+	c = My_Clients;
+	while( c )
+	{
+		if( c->hash == search_hash )
+		{
+			/* lt. Hash-Wert: Treffer! */
+			if( strcasecmp( c->id, search_id ) == 0 ) return c;
+		}
+		c = (CLIENT *)c->next;
+	}
+	return NULL;
+} /* Client_Search */
+
+
+GLOBAL CLIENT *
+Client_GetFromToken( CLIENT *Client, int Token )
+{
+	/* Client-Struktur, die den entsprechenden Introducer (=Client)
+	 * und das gegebene Token hat, liefern. Wird keine gefunden,
+	 * so wird NULL geliefert. */
+
+	CLIENT *c;
+
+	assert( Client != NULL );
+	assert( Token > 0 );
+
 	c = My_Clients;
 	while( c )
 	{
-		if( c->conn_id == Idx ) return c;
-		c = c->next;
+		if(( c->type == CLIENT_SERVER ) && ( c->introducer == Client ) && ( c->token == Token )) return c;
+		c = (CLIENT *)c->next;
 	}
 	return NULL;
-} /* Client_GetFromConn */
+} /* Client_GetFromToken */
+
+
+GLOBAL int
+Client_Type( CLIENT *Client )
+{
+	assert( Client != NULL );
+	return Client->type;
+} /* Client_Type */
+
+
+GLOBAL CONN_ID
+Client_Conn( CLIENT *Client )
+{
+	assert( Client != NULL );
+	return Client->conn_id;
+} /* Client_Conn */
 
 
-GLOBAL CHAR *Client_Name( CLIENT *Client )
+GLOBAL char *
+Client_ID( CLIENT *Client )
 {
 	assert( Client != NULL );
 
-	if( Client->nick[0] ) return Client->nick;
+#ifdef DEBUG
+	if( Client->type == CLIENT_USER ) assert( strlen( Client->id ) < CLIENT_NICK_LEN );
+#endif
+						   
+	if( Client->id[0] ) return Client->id;
 	else return "*";
-} /* Client_Name */
+} /* Client_ID */
+
+
+GLOBAL char *
+Client_Info( CLIENT *Client )
+{
+	assert( Client != NULL );
+	return Client->info;
+} /* Client_Info */
+
+
+GLOBAL char *
+Client_User( CLIENT *Client )
+{
+	assert( Client != NULL );
+	return Client->user[0] ? Client->user : "~";
+} /* Client_User */
+
+
+GLOBAL char *
+Client_Hostname( CLIENT *Client )
+{
+	assert( Client != NULL );
+	return Client->host;
+} /* Client_Hostname */
+
+
+GLOBAL char *
+Client_Password( CLIENT *Client )
+{
+	assert( Client != NULL );
+	return Client->pwd;
+} /* Client_Password */
+
+
+GLOBAL char *
+Client_Modes( CLIENT *Client )
+{
+	assert( Client != NULL );
+	return Client->modes;
+} /* Client_Modes */
+
+
+GLOBAL char *
+Client_Flags( CLIENT *Client )
+{
+	assert( Client != NULL );
+	return Client->flags;
+} /* Client_Flags */
 
 
-LOCAL CLIENT *New_Client_Struct( VOID )
+GLOBAL bool
+Client_OperByMe( CLIENT *Client )
+{
+	assert( Client != NULL );
+	return Client->oper_by_me;
+} /* Client_OperByMe */
+
+
+GLOBAL int
+Client_Hops( CLIENT *Client )
+{
+	assert( Client != NULL );
+	return Client->hops;
+} /* Client_Hops */
+
+
+GLOBAL int
+Client_Token( CLIENT *Client )
+{
+	assert( Client != NULL );
+	return Client->token;
+} /* Client_Token */
+
+
+GLOBAL int
+Client_MyToken( CLIENT *Client )
+{
+	assert( Client != NULL );
+	return Client->mytoken;
+} /* Client_MyToken */
+
+
+GLOBAL CLIENT *
+Client_NextHop( CLIENT *Client )
+{
+	CLIENT *c;
+
+	assert( Client != NULL );
+
+	c = Client;
+	while( c->introducer && ( c->introducer != c ) && ( c->introducer != This_Server ))
+		c = c->introducer;
+
+	return c;
+} /* Client_NextHop */
+
+
+GLOBAL char *
+Client_Mask( CLIENT *Client )
+{
+	/* Client-"ID" liefern, wie sie z.B. fuer
+	 * Prefixe benoetigt wird. */
+
+	assert( Client != NULL );
+
+	if( Client->type == CLIENT_SERVER ) return Client->id;
+
+	snprintf( GetID_Buffer, GETID_LEN, "%s!%s@%s", Client->id, Client->user, Client->host );
+	return GetID_Buffer;
+} /* Client_Mask */
+
+
+GLOBAL CLIENT *
+Client_Introducer( CLIENT *Client )
+{
+	assert( Client != NULL );
+	return Client->introducer;
+} /* Client_Introducer */
+
+
+GLOBAL CLIENT *
+Client_TopServer( CLIENT *Client )
+{
+	assert( Client != NULL );
+	return Client->topserver;
+} /* Client_TopServer */
+
+
+GLOBAL bool
+Client_HasMode( CLIENT *Client, char Mode )
+{
+	assert( Client != NULL );
+	return strchr( Client->modes, Mode ) != NULL;
+} /* Client_HasMode */
+
+
+GLOBAL char *
+Client_Away( CLIENT *Client )
+{
+	/* AWAY-Text liefern */
+
+	assert( Client != NULL );
+	return Client->away;
+} /* Client_Away */
+
+
+GLOBAL bool
+Client_CheckNick( CLIENT *Client, char *Nick )
+{
+	assert( Client != NULL );
+	assert( Nick != NULL );
+
+	if( ! Client_IsValidNick( Nick ))
+	{
+		IRC_WriteStrClient( Client, ERR_ERRONEUSNICKNAME_MSG, Client_ID( Client ), Nick );
+		return false;
+	}
+
+	/* Nick bereits vergeben? */
+	if( Client_Search( Nick ))
+	{
+		/* den Nick gibt es bereits */
+		IRC_WriteStrClient( Client, ERR_NICKNAMEINUSE_MSG, Client_ID( Client ), Nick );
+		return false;
+	}
+
+	return true;
+} /* Client_CheckNick */
+
+
+GLOBAL bool
+Client_CheckID( CLIENT *Client, char *ID )
+{
+	/* Nick ueberpruefen */
+
+	char str[COMMAND_LEN];
+	CLIENT *c;
+
+	assert( Client != NULL );
+	assert( Client->conn_id > NONE );
+	assert( ID != NULL );
+
+	/* Nick zu lang? */
+	if( strlen( ID ) > CLIENT_ID_LEN )
+	{
+		IRC_WriteStrClient( Client, ERR_ERRONEUSNICKNAME_MSG, Client_ID( Client ), ID );
+		return false;
+	}
+
+	/* ID bereits vergeben? */
+	c = My_Clients;
+	while( c )
+	{
+		if( strcasecmp( c->id, ID ) == 0 )
+		{
+			/* die Server-ID gibt es bereits */
+			snprintf( str, sizeof( str ), "ID \"%s\" already registered", ID );
+			if( Client->conn_id != c->conn_id ) Log( LOG_ERR, "%s (on connection %d)!", str, c->conn_id );
+			else Log( LOG_ERR, "%s (via network)!", str );
+			Conn_Close( Client->conn_id, str, str, true);
+			return false;
+		}
+		c = (CLIENT *)c->next;
+	}
+
+	return true;
+} /* Client_CheckID */
+
+
+GLOBAL CLIENT *
+Client_First( void )
+{
+	/* Ersten Client liefern. */
+
+	return My_Clients;
+} /* Client_First */
+
+
+GLOBAL CLIENT *
+Client_Next( CLIENT *c )
+{
+	/* Naechsten Client liefern. Existiert keiner,
+	 * so wird NULL geliefert. */
+
+	assert( c != NULL );
+	return (CLIENT *)c->next;
+} /* Client_Next */
+
+
+GLOBAL long
+Client_UserCount( void )
+{
+	return Count( CLIENT_USER );
+} /* Client_UserCount */
+
+
+GLOBAL long
+Client_ServiceCount( void )
+{
+	return Count( CLIENT_SERVICE );;
+} /* Client_ServiceCount */
+
+
+GLOBAL long
+Client_ServerCount( void )
+{
+	return Count( CLIENT_SERVER );
+} /* Client_ServerCount */
+
+
+GLOBAL long
+Client_MyUserCount( void )
+{
+	return MyCount( CLIENT_USER );
+} /* Client_MyUserCount */
+
+
+GLOBAL long
+Client_MyServiceCount( void )
+{
+	return MyCount( CLIENT_SERVICE );
+} /* Client_MyServiceCount */
+
+
+GLOBAL unsigned long
+Client_MyServerCount( void )
+{
+	CLIENT *c;
+	unsigned long cnt = 0;
+
+	c = My_Clients;
+	while( c )
+	{
+		if(( c->type == CLIENT_SERVER ) && ( c->hops == 1 )) cnt++;
+		c = (CLIENT *)c->next;
+	}
+	return cnt;
+} /* Client_MyServerCount */
+
+
+GLOBAL unsigned long
+Client_OperCount( void )
+{
+	CLIENT *c;
+	unsigned long cnt = 0;
+
+	c = My_Clients;
+	while( c )
+	{
+		if( c && ( c->type == CLIENT_USER ) && ( strchr( c->modes, 'o' ))) cnt++;
+		c = (CLIENT *)c->next;
+	}
+	return cnt;
+} /* Client_OperCount */
+
+
+GLOBAL unsigned long
+Client_UnknownCount( void )
+{
+	CLIENT *c;
+	unsigned long cnt = 0;
+
+	c = My_Clients;
+	while( c )
+	{
+		if( c && ( c->type != CLIENT_USER ) && ( c->type != CLIENT_SERVICE ) && ( c->type != CLIENT_SERVER )) cnt++;
+		c = (CLIENT *)c->next;
+	}
+
+	return cnt;
+} /* Client_UnknownCount */
+
+
+GLOBAL long
+Client_MaxUserCount( void )
+{
+	return Max_Users;
+} /* Client_MaxUserCount */
+
+
+GLOBAL long
+Client_MyMaxUserCount( void )
+{
+	return My_Max_Users;
+} /* Client_MyMaxUserCount */
+
+
+GLOBAL bool
+Client_IsValidNick( const char *Nick )
+{
+	const char *ptr;
+	static const char goodchars[] = ";0123456789-";
+
+	assert( Nick != NULL );
+
+	if( Nick[0] == '#' ) return false;
+	if( strchr( goodchars, Nick[0] )) return false;
+	if( strlen( Nick ) >= CLIENT_NICK_LEN ) return false;
+
+	ptr = Nick;
+	while( *ptr )
+	{
+		if (( *ptr < 'A' ) && ( ! strchr( goodchars, *ptr ))) return false;
+		if ( *ptr > '}' ) return false;
+		ptr++;
+	}
+
+	return true;
+} /* Client_IsValidNick */
+
+
+/**
+ * Return pointer to "My_Whowas" structure.
+ */
+GLOBAL WHOWAS *
+Client_GetWhowas( void )
+{
+	return My_Whowas;
+} /* Client_GetWhowas */
+
+/**
+ * Return the index of the last used WHOWAS entry.
+ */
+GLOBAL int
+Client_GetLastWhowasIndex( void )
+{
+	return Last_Whowas;
+} /* Client_GetLastWhowasIndex */
+
+
+/**
+ * Get the start time of this client.
+ * The result is the start time in seconds since 1970-01-01, as reported
+ * by the C function time(NULL).
+ */
+GLOBAL time_t
+Client_StartTime(CLIENT *Client)
+{
+	assert( Client != NULL );
+	return Client->starttime;
+} /* Client_Uptime */
+
+
+static unsigned long
+Count( CLIENT_TYPE Type )
+{
+	CLIENT *c;
+	unsigned long cnt = 0;
+
+	c = My_Clients;
+	while( c )
+	{
+		if( c->type == Type ) cnt++;
+		c = (CLIENT *)c->next;
+	}
+	return cnt;
+} /* Count */
+
+
+static unsigned long
+MyCount( CLIENT_TYPE Type )
+{
+	CLIENT *c;
+	unsigned long cnt = 0;
+
+	c = My_Clients;
+	while( c )
+	{
+		if(( c->introducer == This_Server ) && ( c->type == Type )) cnt++;
+		c = (CLIENT *)c->next;
+	}
+	return cnt;
+} /* MyCount */
+
+
+static CLIENT *
+New_Client_Struct( void )
 {
 	/* Neue CLIENT-Struktur pre-initialisieren */
-	
+
 	CLIENT *c;
-	INT i;
-	
-	c = malloc( sizeof( CLIENT ));
+
+	c = (CLIENT *)malloc( sizeof( CLIENT ));
 	if( ! c )
 	{
-		Log( LOG_EMERG, "Can't allocate memory!" );
+		Log( LOG_EMERG, "Can't allocate memory! [New_Client_Struct]" );
 		return NULL;
 	}
 
-	c->next = NULL;
+	memset( c, 0, sizeof ( CLIENT ));
+
 	c->type = CLIENT_UNKNOWN;
 	c->conn_id = NONE;
-	c->introducer = NULL;
-	strcpy( c->nick, "" );
-	strcpy( c->pass, "" );
-	strcpy( c->host, "" );
-	strcpy( c->user, "" );
-	strcpy( c->name, "" );
-	for( i = 0; i < MAX_CHANNELS; c->channels[i++] = NULL );
+	c->oper_by_me = false;
+	c->hops = -1;
+	c->token = -1;
+	c->mytoken = -1;
 
 	return c;
 } /* New_Client */
 
 
+static void
+Generate_MyToken( CLIENT *Client )
+{
+	CLIENT *c;
+	int token;
+
+	c = My_Clients;
+	token = 2;
+	while( c )
+	{
+		if( c->mytoken == token )
+		{
+			/* Das Token wurde bereits vergeben */
+			token++;
+			c = My_Clients;
+			continue;
+		}
+		else c = (CLIENT *)c->next;
+	}
+	Client->mytoken = token;
+	Log( LOG_DEBUG, "Assigned token %d to server \"%s\".", token, Client->id );
+} /* Generate_MyToken */
+
+
+static void
+Adjust_Counters( CLIENT *Client )
+{
+	long count;
+
+	assert( Client != NULL );
+
+	if( Client->type != CLIENT_USER ) return;
+
+	if( Client->conn_id != NONE )
+	{
+		/* Local connection */
+		count = Client_MyUserCount( );
+		if( count > My_Max_Users ) My_Max_Users = count;
+	}
+	count = Client_UserCount( );
+	if( count > Max_Users ) Max_Users = count;
+} /* Adjust_Counters */
+
+
+/**
+ * Register client in My_Whowas structure for further recall by WHOWAS.
+ * Note: Only clients that have been connected at least 30 seconds will be
+ * registered to prevent automated IRC bots to "destroy" a nice server
+ * history database.
+ */
+GLOBAL void
+Client_RegisterWhowas( CLIENT *Client )
+{
+	int slot;
+	time_t now;
+
+	assert( Client != NULL );
+
+	now = time(NULL);
+	/* Don't register clients that were connected less than 30 seconds. */
+	if( now - Client->starttime < 30 )
+		return;
+
+	slot = Last_Whowas + 1;
+	if( slot >= MAX_WHOWAS || slot < 0 ) slot = 0;
+
+#ifdef DEBUG
+	Log( LOG_DEBUG, "Saving WHOWAS information to slot %d ...", slot );
+#endif
+
+	My_Whowas[slot].time = now;
+	strlcpy( My_Whowas[slot].id, Client_ID( Client ),
+		 sizeof( My_Whowas[slot].id ));
+	strlcpy( My_Whowas[slot].user, Client_User( Client ),
+		 sizeof( My_Whowas[slot].user ));
+	strlcpy( My_Whowas[slot].host, Client_Hostname( Client ),
+		 sizeof( My_Whowas[slot].host ));
+	strlcpy( My_Whowas[slot].info, Client_Info( Client ),
+		 sizeof( My_Whowas[slot].info ));
+	strlcpy( My_Whowas[slot].server, Client_ID( Client_Introducer( Client )),
+		 sizeof( My_Whowas[slot].server ));
+
+	Last_Whowas = slot;
+} /* Client_RegisterWhowas */
+
+
 /* -eof- */