X-Git-Url: https://arthur.barton.de/cgi-bin/gitweb.cgi?p=ngircd-alex.git;a=blobdiff_plain;f=src%2Fngircd%2Fclient.c;h=07d448fdbaf9a84873f32e22584636251e2d3fd5;hp=624ff1e17f4c965f85f1743a820ca0e447dbce60;hb=bf2eae3249cd7890c0189dfcf1a50b0e40e199b2;hpb=29ad5e0d9490f05de5b0e13542d9970330175597

diff --git a/src/ngircd/client.c b/src/ngircd/client.c
index 624ff1e1..07d448fd 100644
--- a/src/ngircd/client.c
+++ b/src/ngircd/client.c
@@ -1,80 +1,72 @@
 /*
  * ngIRCd -- The Next Generation IRC Daemon
- * Copyright (c)2001-2005 by Alexander Barton (alex@barton.de)
+ * Copyright (c)2001-2014 Alexander Barton (alex@barton.de) and Contributors.
  *
  * 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.
  */
 
-
 #define __client_c__
 
-
 #include "portab.h"
 
-static char UNUSED id[] = "$Id: client.c,v 1.87 2006/03/11 01:37:31 alex Exp $";
+/**
+ * @file
+ * Client management.
+ */
 
-#include "imp.h"
 #include <assert.h>
 #include <unistd.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <strings.h>
+#include <time.h>
 #include <netdb.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 "conn-func.h"
 #include "hash.h"
 #include "irc-write.h"
 #include "log.h"
+#include "match.h"
 #include "messages.h"
 
-#include <exp.h>
-
-
 #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 long Max_Users, My_Max_Users;
 
 
-static long Count PARAMS(( CLIENT_TYPE Type ));
-static long MyCount PARAMS(( CLIENT_TYPE Type ));
+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));
-
-#ifndef Client_DestroyNow
-GLOBAL void Client_DestroyNow PARAMS((CLIENT *Client ));
-#endif
+static void Free_Client PARAMS(( CLIENT **Client ));
 
+static CLIENT *Init_New_Client PARAMS((CONN_ID Idx, CLIENT *Introducer,
+				       CLIENT *TopServer, int Type, const char *ID,
+				       const char *User, const char *Hostname, const char *Info,
+				       int Hops, int Token, const char *Modes,
+				       bool Idented));
 
-long Max_Users = 0, My_Max_Users = 0;
+static void Destroy_UserOrService PARAMS((CLIENT *Client,const char *Txt, const char *FwdMsg,
+					bool SendQuit));
 
+static void cb_introduceClient PARAMS((CLIENT *Client, CLIENT *Prefix,
+				       void *i));
 
 GLOBAL void
 Client_Init( void )
@@ -89,7 +81,7 @@ Client_Init( void )
 		exit( 1 );
 	}
 
-	/* Client-Struktur dieses Servers */
+	/* Client structure for this server */
 	This_Server->next = NULL;
 	This_Server->type = CLIENT_SERVER;
 	This_Server->conn_id = NONE;
@@ -98,9 +90,10 @@ Client_Init( void )
 	This_Server->hops = 0;
 
 	gethostname( This_Server->host, CLIENT_HOST_LEN );
-	h = gethostbyname( This_Server->host );
-	if( h ) strlcpy( This_Server->host, h->h_name, sizeof( This_Server->host ));
-
+	if (Conf_DNS) {
+		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 );
 
@@ -121,14 +114,15 @@ Client_Exit( void )
 	
 	cnt = 0;
 	c = My_Clients;
-	while( c )
-	{
+	while(c) {
 		cnt++;
 		next = (CLIENT *)c->next;
-		free( c );
+		Free_Client(&c);
 		c = next;
 	}
-	if( cnt ) Log( LOG_INFO, "Freed %d client structure%s.", cnt, cnt == 1 ? "" : "s" );
+	if (cnt)
+		Log(LOG_INFO, "Freed %d client structure%s.",
+		    cnt, cnt == 1 ? "" : "s");
 } /* Client_Exit */
 
 
@@ -144,7 +138,7 @@ Client_ThisServer( void )
  * @return New CLIENT structure.
  */
 GLOBAL CLIENT *
-Client_NewLocal(CONN_ID Idx, char *Hostname, int Type, bool Idented)
+Client_NewLocal(CONN_ID Idx, const char *Hostname, int Type, bool Idented)
 {
 	return Init_New_Client(Idx, This_Server, NULL, Type, NULL, NULL,
 		Hostname, NULL, 0, 0, NULL, Idented);
@@ -156,8 +150,8 @@ Client_NewLocal(CONN_ID Idx, char *Hostname, int Type, bool Idented)
  * @return New CLIENT structure.
  */
 GLOBAL CLIENT *
-Client_NewRemoteServer(CLIENT *Introducer, char *Hostname, CLIENT *TopServer,
- int Hops, int Token, char *Info, bool Idented)
+Client_NewRemoteServer(CLIENT *Introducer, const char *Hostname, CLIENT *TopServer,
+ int Hops, int Token, const char *Info, bool Idented)
 {
 	return Init_New_Client(NONE, Introducer, TopServer, CLIENT_SERVER,
 		Hostname, NULL, Hostname, Info, Hops, Token, NULL, Idented);
@@ -169,8 +163,8 @@ Client_NewRemoteServer(CLIENT *Introducer, char *Hostname, CLIENT *TopServer,
  * @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)
+Client_NewRemoteUser(CLIENT *Introducer, const char *Nick, int Hops, const char *User,
+ const char *Hostname, int Token, const char *Modes, const char *Info, bool Idented)
 {
 	return Init_New_Client(NONE, Introducer, NULL, CLIENT_USER, Nick,
 		User, Hostname, Info, Hops, Token, Modes, Idented);
@@ -184,62 +178,68 @@ Client_NewRemoteUser(CLIENT *Introducer, char *Nick, int Hops, char *User,
  */
 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)
+  int Type, const char *ID, const char *User, const char *Hostname,
+  const char *Info, int Hops, int Token, const char *Modes, bool Idented)
 {
 	CLIENT *client;
 
-	assert( Idx >= NONE );
-	assert( Introducer != NULL );
-	assert( Hostname != NULL );
+	assert(Idx >= NONE);
+	assert(Introducer != NULL);
 
-	client = New_Client_Struct( );
-	if( ! client ) return NULL;
+	client = New_Client_Struct();
+	if (!client)
+		return NULL;
 
-	/* Initialisieren */
 	client->starttime = time(NULL);
 	client->conn_id = Idx;
 	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 );
+	if (ID)
+		Client_SetID(client, ID);
+	if (User) {
+		Client_SetUser(client, User, Idented);
+		Client_SetOrigUser(client, User);
+	}
+	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 (Modes)
+		Client_SetModes(client, Modes);
+	if (Type == CLIENT_SERVER)
+		Generate_MyToken(client);
 
-	/* ist der User away? */
-	if( strchr( client->modes, 'a' )) strlcpy( client->away, DEFAULT_AWAY_MSG, sizeof( client->away ));
+	if (Client_HasMode(client, 'a'))
+		client->away = strndup(DEFAULT_AWAY_MSG, CLIENT_AWAY_LEN - 1);
 
-	/* Verketten */
 	client->next = (POINTER *)My_Clients;
 	My_Clients = client;
 
-	/* Adjust counters */
-	Adjust_Counters( client );
+	Adjust_Counters(client);
 
 	return client;
 } /* Init_New_Client */
 
 
 GLOBAL void
-Client_Destroy( CLIENT *Client, char *LogMsg, char *FwdMsg, bool SendQuit )
+Client_Destroy( CLIENT *Client, const char *LogMsg, const char *FwdMsg, bool SendQuit )
 {
-	/* Client entfernen. */
+	/* remove a client */
 	
 	CLIENT *last, *c;
-	char msg[LINE_LEN], *txt;
+	char msg[COMMAND_LEN];
+	const char *txt;
 
 	assert( Client != NULL );
 
-	if( LogMsg ) txt = LogMsg;
-	else txt = FwdMsg;
-	if( ! txt ) txt = "Reason unknown.";
+	txt = LogMsg ? LogMsg : FwdMsg;
+	if (!txt)
+		txt = "Reason unknown";
 
-	/* Netz-Split-Nachricht vorbereiten (noch nicht optimal) */
+	/* netsplit message */
 	if( Client->type == CLIENT_SERVER ) {
 		strlcpy(msg, This_Server->id, sizeof (msg));
 		strlcat(msg, " ", sizeof (msg));
@@ -252,8 +252,16 @@ Client_Destroy( CLIENT *Client, char *LogMsg, char *FwdMsg, bool SendQuit )
 	{
 		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 */
+			/*
+			 * The client that is about to be removed is a server,
+			 * the client we are checking right now is a child of that
+			 * server and thus has to be removed, too.
+			 *
+			 * Call Client_Destroy() recursively with the server as the
+			 * new "object to be removed". This starts the cycle again, until
+			 * all servers that are linked via the original server have been
+			 * removed.
+			 */
 			Client_Destroy( c, NULL, msg, false );
 			last = NULL;
 			c = My_Clients;
@@ -261,54 +269,26 @@ Client_Destroy( CLIENT *Client, char *LogMsg, char *FwdMsg, bool SendQuit )
 		}
 		if( c == Client )
 		{
-			/* Wir haben den Client gefunden: entfernen */
+			/* found  the client: remove it */
 			if( last ) last->next = 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 );
-			}
+			if(c->type == CLIENT_USER || c->type == CLIENT_SERVICE)
+				Destroy_UserOrService(c, txt, FwdMsg, SendQuit);
 			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 );
+				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 */
+				/* inform other servers */
 				if( ! NGIRCd_SignalQuit )
 				{
 					if( FwdMsg ) IRC_WriteStrServersPrefix( Client_NextHop( c ), c, "SQUIT %s :%s", c->id, FwdMsg );
@@ -317,19 +297,23 @@ Client_Destroy( CLIENT *Client, char *LogMsg, char *FwdMsg, bool SendQuit )
 			}
 			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
-				{
-					if( c->id[0] ) Log( LOG_WARNING, "Unregistered unknown client \"%s\": %s", c->id, txt );
-					else Log( LOG_WARNING, "Unregistered unknown client: %s", c->id, txt );
+				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 );
+			Free_Client(&c);
 			break;
 		}
 		last = c;
@@ -338,137 +322,183 @@ Client_Destroy( CLIENT *Client, char *LogMsg, char *FwdMsg, bool SendQuit )
 } /* Client_Destroy */
 
 
+/**
+ * Set client hostname.
+ *
+ * If global hostname cloaking is in effect, don't set the real hostname
+ * but the configured one.
+ *
+ * @param Client The client of which the hostname should be set.
+ * @param Hostname The new hostname.
+ */
 GLOBAL void
-Client_DestroyNow( CLIENT *Client )
+Client_SetHostname( CLIENT *Client, const char *Hostname )
 {
-	/* Destroy client structure immediately. This function is only
-	 * intended for the connection layer to remove client structures
-	 * of connections that can't be established! */
+	assert(Client != NULL);
+	assert(Hostname != NULL);
 
-	CLIENT *last, *c;
+	if (Conf_CloakHost[0]) {
+		char cloak[GETID_LEN];
 
-	assert( Client != NULL );
+		strlcpy(cloak, Hostname, GETID_LEN);
+		strlcat(cloak, Conf_CloakHostSalt, GETID_LEN);
+		snprintf(cloak, GETID_LEN, Conf_CloakHost, Hash(cloak));
 
-	last = NULL;
-	c = My_Clients;
-	while( c )
-	{
-		if( c == Client )
-		{
-			/* Wir haben den Client gefunden: entfernen */
-			if( last ) last->next = c->next;
-			else My_Clients = (CLIENT *)c->next;
-			free( c );
-			break;
-		}
-		last = c;
-		c = (CLIENT *)c->next;
+		LogDebug("Updating hostname of \"%s\": \"%s\" -> \"%s\"",
+			Client_ID(Client), Client->host, cloak);
+		strlcpy(Client->host, cloak, sizeof(Client->host));
+	} else {
+		LogDebug("Updating hostname of \"%s\": \"%s\" -> \"%s\"",
+			 Client_ID(Client), Client->host, Hostname);
+		strlcpy(Client->host, Hostname, sizeof(Client->host));
 	}
-} /* Client_DestroyNow */
+} /* Client_SetHostname */
 
 
+/**
+ * Set IP address to display for a client.
+ *
+ * @param Client The client.
+ * @param IPAText Textual representation of the IP address or NULL to unset.
+ */
 GLOBAL void
-Client_SetHostname( CLIENT *Client, char *Hostname )
+Client_SetIPAText(CLIENT *Client, const char *IPAText)
 {
-	/* Hostname eines Clients setzen */
-	
-	assert( Client != NULL );
-	assert( Hostname != NULL );
-	
-	strlcpy( Client->host, Hostname, sizeof( Client->host ));
-} /* Client_SetHostname */
+	assert(Client != NULL);
+
+	if (Client->ipa_text)
+		free(Client->ipa_text);
+
+	if (*IPAText)
+		Client->ipa_text = strndup(IPAText, CLIENT_HOST_LEN - 1);
+	else
+		Client->ipa_text = NULL;
+}
 
 
 GLOBAL void
-Client_SetID( CLIENT *Client, char *ID )
+Client_SetID( CLIENT *Client, const char *ID )
 {
-	/* Hostname eines Clients setzen, Hash-Wert berechnen */
-
 	assert( Client != NULL );
 	assert( ID != NULL );
 	
 	strlcpy( Client->id, ID, sizeof( Client->id ));
 
+	if (Conf_CloakUserToNick) {
+		strlcpy( Client->user, ID, sizeof( Client->user ));
+		strlcpy( Client->info, ID, sizeof( Client->info ));
+	}
+
 	/* Hash */
 	Client->hash = Hash( Client->id );
 } /* Client_SetID */
 
 
 GLOBAL void
-Client_SetUser( CLIENT *Client, char *User, bool Idented )
+Client_SetUser( CLIENT *Client, const char *User, bool Idented )
 {
-	/* Username eines Clients setzen */
+	/* set clients username */
 
 	assert( Client != NULL );
 	assert( User != NULL );
-	
-	if( Idented ) strlcpy( Client->user, User, sizeof( Client->user ));
-	else
-	{
+
+	if (Conf_CloakUserToNick) {
+		strlcpy(Client->user, Client->id, sizeof(Client->user));
+	} else if (Idented) {
+		strlcpy(Client->user, User, sizeof(Client->user));
+	} else {
 		Client->user[0] = '~';
-		strlcpy( Client->user + 1, User, sizeof( Client->user ) - 1 );
+		strlcpy(Client->user + 1, User, sizeof(Client->user) - 1);
 	}
 } /* Client_SetUser */
 
 
+/**
+ * Set "original" user name of a client.
+ * This function saves the "original" user name, the user name specified by
+ * the peer using the USER command, into the CLIENT structure. This user
+ * name may be used for authentication, for example.
+ * @param Client The client.
+ * @param User User name to set.
+ */
 GLOBAL void
-Client_SetInfo( CLIENT *Client, char *Info )
+Client_SetOrigUser(CLIENT UNUSED *Client, const char UNUSED *User)
 {
-	/* Hostname eines Clients setzen */
+	assert(Client != NULL);
+	assert(User != NULL);
+
+#if defined(PAM)
+	strlcpy(Client->orig_user, User, sizeof(Client->orig_user));
+#endif
+} /* Client_SetOrigUser */
+
+
+GLOBAL void
+Client_SetInfo( CLIENT *Client, const char *Info )
+{
+	/* set client hostname */
 
 	assert( Client != NULL );
 	assert( Info != NULL );
-	
-	strlcpy( Client->info, Info, sizeof( Client->info ));
+
+	if (Conf_CloakUserToNick)
+		strlcpy(Client->info, Client->id, sizeof(Client->info));
+	else
+		strlcpy(Client->info, Info, sizeof(Client->info));
 } /* Client_SetInfo */
 
 
 GLOBAL void
-Client_SetModes( CLIENT *Client, char *Modes )
+Client_SetModes( CLIENT *Client, const char *Modes )
 {
-	/* Modes eines Clients setzen */
-
 	assert( Client != NULL );
 	assert( Modes != NULL );
 
-	strlcpy( Client->modes, Modes, sizeof( Client->modes ));
+	strlcpy(Client->modes, Modes, sizeof( Client->modes ));
 } /* Client_SetModes */
 
 
 GLOBAL void
-Client_SetFlags( CLIENT *Client, char *Flags )
+Client_SetFlags( CLIENT *Client, const char *Flags )
 {
-	/* Flags eines Clients setzen */
-
 	assert( Client != NULL );
 	assert( Flags != NULL );
 
-	strlcpy( Client->flags, Flags, sizeof( Client->flags ));
+	strlcpy(Client->flags, Flags, sizeof(Client->flags));
 } /* Client_SetFlags */
 
 
 GLOBAL void
-Client_SetPassword( CLIENT *Client, char *Pwd )
+Client_SetAccountName(CLIENT *Client, const char *AccountName)
 {
-	/* Von einem Client geliefertes Passwort */
+	assert(Client != NULL);
 
-	assert( Client != NULL );
-	assert( Pwd != NULL );
-	
-	strlcpy( Client->pwd, Pwd, sizeof( Client->pwd ));
-} /* Client_SetPassword */
+	if (Client->account_name)
+		free(Client->account_name);
+
+	if (*AccountName)
+		Client->account_name = strndup(AccountName,
+					       CLIENT_NICK_LEN - 1);
+	else
+		Client->account_name = NULL;
+}
 
 
 GLOBAL void
-Client_SetAway( CLIENT *Client, char *Txt )
+Client_SetAway( CLIENT *Client, const 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 );
+	if (Client->away)
+		free(Client->away);
+
+	Client->away = strndup(Txt, CLIENT_AWAY_LEN - 1);
+
+	LogDebug("%s \"%s\" is away: %s", Client_TypeText(Client),
+		 Client_Mask(Client), Txt);
 } /* Client_SetAway */
 
 
@@ -507,30 +537,20 @@ Client_SetIntroducer( CLIENT *Client, CLIENT *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 Client already 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 */
+	if (!Client_HasMode(Client, x[0])) {
 		strlcat( Client->modes, x, sizeof( Client->modes ));
 		return true;
 	}
@@ -565,77 +585,88 @@ Client_ModeDel( CLIENT *Client, char Mode )
 } /* Client_ModeDel */
 
 
+/**
+ * Search CLIENT structure of a given nick name.
+ *
+ * @return Pointer to CLIENT structure or NULL if not found.
+ */
 GLOBAL CLIENT *
-Client_GetFromConn( CONN_ID Idx )
+Client_Search( const char *Nick )
 {
-	/* return Client-Structure that belongs to the local Connection Idx gehoert.
-	 * If none is found, return NULL.
-	 */
+	char search_id[CLIENT_ID_LEN], *ptr;
+	CLIENT *c = NULL;
+	UINT32 search_hash;
 
-	CLIENT *c;
+	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);
 
-	assert( Idx >= 0 );
-	
 	c = My_Clients;
-	while( c )
-	{
-		if( c->conn_id == Idx ) return c;
+	while (c) {
+		if (c->hash == search_hash && strcasecmp(c->id, search_id) == 0)
+			return c;
 		c = (CLIENT *)c->next;
 	}
 	return NULL;
-} /* Client_GetFromConn */
+}
 
 
+/**
+ * Search first CLIENT structure matching a given mask of a server.
+ *
+ * The order of servers is arbitrary, but this function makes sure that the
+ * local server is always returned if the mask matches it.
+ *
+ * @return Pointer to CLIENT structure or NULL if no server could be found.
+ */
 GLOBAL CLIENT *
-Client_Search( char *Nick )
+Client_SearchServer(const char *Mask)
 {
-	/* 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;
+	CLIENT *c;
 
-	assert( Nick != NULL );
+	assert(Mask != 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 );
+	/* First check if mask matches the local server */
+	if (MatchCaseInsensitive(Mask, Client_ID(Client_ThisServer())))
+		return Client_ThisServer();
 
 	c = My_Clients;
-	while( c )
-	{
-		if( c->hash == search_hash )
-		{
-			/* lt. Hash-Wert: Treffer! */
-			if( strcasecmp( c->id, search_id ) == 0 ) return c;
+	while (c) {
+		if (Client_Type(c) == CLIENT_SERVER) {
+			/* This is a server: check if Mask matches */
+			if (MatchCaseInsensitive(Mask, c->id))
+				return c;
 		}
 		c = (CLIENT *)c->next;
 	}
 	return NULL;
-} /* Client_Search */
+}
 
 
+/**
+ * Get client structure ("introducer") identfied by a server token.
+ * @return CLIENT structure or NULL if none could be found.
+ */
 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 );
+
+	if (!Token)
+		return NULL;
 
 	c = My_Clients;
-	while( c )
-	{
-		if(( c->type == CLIENT_SERVER ) && ( c->introducer == Client ) && ( c->token == Token )) return c;
+	while (c) {
+		if ((c->type == CLIENT_SERVER) && (c->introducer == Client) &&
+			(c->token == Token))
+				return c;
 		c = (CLIENT *)c->next;
 	}
 	return NULL;
@@ -664,7 +695,8 @@ Client_ID( CLIENT *Client )
 	assert( Client != NULL );
 
 #ifdef DEBUG
-	if( Client->type == CLIENT_USER ) assert( strlen( Client->id ) < CLIENT_NICK_LEN );
+	if(Client->type == CLIENT_USER)
+		assert(strlen(Client->id) < Conf_MaxNickLength);
 #endif
 						   
 	if( Client->id[0] ) return Client->id;
@@ -684,26 +716,138 @@ GLOBAL char *
 Client_User( CLIENT *Client )
 {
 	assert( Client != NULL );
-	if( Client->user[0] ) return Client->user;
-	else return "~";
+	return Client->user[0] ? Client->user : "~";
 } /* Client_User */
 
 
+#ifdef PAM
+
+/**
+ * Get the "original" user name as supplied by the USER command.
+ * The user name as given by the client is used for authentication instead
+ * of the one detected using IDENT requests.
+ * @param Client The client.
+ * @return Original user name.
+ */
+GLOBAL char *
+Client_OrigUser(CLIENT *Client) {
+	return Client->orig_user;
+} /* Client_OrigUser */
+
+#endif
+
+/**
+ * Return the hostname of a client.
+ * @param Client Pointer to client structure
+ * @return Pointer to client hostname
+ */
 GLOBAL char *
-Client_Hostname( CLIENT *Client )
+Client_Hostname(CLIENT *Client)
 {
-	assert( Client != NULL );
+	assert (Client != NULL);
 	return Client->host;
-} /* Client_Hostname */
+}
 
+/**
+ * Return the cloaked hostname of a client, if set.
+ * @param Client Pointer to the client structure.
+ * @return Pointer to the cloaked hostname or NULL if not set.
+ */
+GLOBAL char *
+Client_HostnameCloaked(CLIENT *Client)
+{
+	assert(Client != NULL);
+	return Client->cloaked;
+}
 
+/**
+ * Get (potentially cloaked) hostname of a client to display it to other users.
+ *
+ * If the client has not enabled cloaking, the real hostname is used.
+ *
+ * @param Client Pointer to client structure
+ * @return Pointer to client hostname
+ */
 GLOBAL char *
-Client_Password( CLIENT *Client )
+Client_HostnameDisplayed(CLIENT *Client)
 {
-	assert( Client != NULL );
-	return Client->pwd;
-} /* Client_Password */
+	assert(Client != NULL);
+
+	/* Client isn't cloaked at all, return real hostname: */
+	if (!Client_HasMode(Client, 'x'))
+		return Client_Hostname(Client);
+
+	/* Use an already saved cloaked hostname, if there is one */
+	if (Client->cloaked)
+		return Client->cloaked;
+
+	Client_UpdateCloakedHostname(Client, NULL, NULL);
+	return Client->cloaked;
+}
+
+GLOBAL const char *
+Client_IPAText(CLIENT *Client)
+{
+	assert(Client != NULL);
+
+	/* Not a local client? */
+	if (Client_Conn(Client) <= NONE)
+		return "0.0.0.0";
+
+	if (!Client->ipa_text)
+		return Conn_GetIPAInfo(Client_Conn(Client));
+	else
+		return Client->ipa_text;
+}
 
+/**
+ * Update (and generate, if necessary) the cloaked hostname of a client.
+ *
+ * The newly set cloaked hostname is announced in the network using METADATA
+ * commands to peers that support this feature.
+ *
+ * @param Client The client of which the cloaked hostname should be updated.
+ * @param Origin The originator of the hostname change, or NULL if this server.
+ * @param Hostname The new cloaked hostname, or NULL if it should be generated.
+ */
+GLOBAL void
+Client_UpdateCloakedHostname(CLIENT *Client, CLIENT *Origin,
+			     const char *Hostname)
+{
+	char Cloak_Buffer[CLIENT_HOST_LEN];
+
+	assert(Client != NULL);
+	if (!Origin)
+		Origin = Client_ThisServer();
+
+	if (!Client->cloaked) {
+		Client->cloaked = malloc(CLIENT_HOST_LEN);
+		if (!Client->cloaked)
+			return;
+	}
+
+	if (!Hostname) {
+		/* Generate new cloaked hostname */
+		if (*Conf_CloakHostModeX) {
+			strlcpy(Cloak_Buffer, Client->host,
+				sizeof(Cloak_Buffer));
+			strlcat(Cloak_Buffer, Conf_CloakHostSalt,
+				sizeof(Cloak_Buffer));
+			snprintf(Client->cloaked, CLIENT_HOST_LEN,
+				 Conf_CloakHostModeX, Hash(Cloak_Buffer));
+		} else
+			strlcpy(Client->cloaked, Client_ID(Client->introducer),
+				CLIENT_HOST_LEN);
+	} else
+		strlcpy(Client->cloaked, Hostname, CLIENT_HOST_LEN);
+	LogDebug("Cloaked hostname of \"%s\" updated to \"%s\"",
+		 Client_ID(Client), Client->cloaked);
+
+	/* Inform other servers in the network */
+	IRC_WriteStrServersPrefixFlag(Client_NextHop(Origin), Origin, 'M',
+				      "METADATA %s cloakhost :%s",
+				      Client_ID(Client), Client->cloaked);
+}
 
 GLOBAL char *
 Client_Modes( CLIENT *Client )
@@ -721,14 +865,6 @@ Client_Flags( CLIENT *Client )
 } /* Client_Flags */
 
 
-GLOBAL bool
-Client_OperByMe( CLIENT *Client )
-{
-	assert( Client != NULL );
-	return Client->oper_by_me;
-} /* Client_OperByMe */
-
-
 GLOBAL int
 Client_Hops( CLIENT *Client )
 {
@@ -757,30 +893,71 @@ 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;
+	while( c->introducer && ( c->introducer != c ) && ( c->introducer != This_Server ))
+		c = c->introducer;
+
 	return c;
 } /* Client_NextHop */
 
 
+/**
+ * Return ID of a client: "client!user@host"
+ * This client ID is used for IRC prefixes, for example.
+ * Please note that this function uses a global static buffer, so you can't
+ * nest invocations without overwriting earlier results!
+ * @param Client Pointer to client structure
+ * @return Pointer to global buffer containing the client ID
+ */
 GLOBAL char *
 Client_Mask( CLIENT *Client )
 {
-	/* Client-"ID" liefern, wie sie z.B. fuer
-	 * Prefixe benoetigt wird. */
+	static char Mask_Buffer[GETID_LEN];
 
-	assert( Client != NULL );
-	
-	if( Client->type == CLIENT_SERVER ) return Client->id;
+	assert (Client != NULL);
+
+	/* Servers: return name only, there is no "mask" */
+	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;
+	snprintf(Mask_Buffer, GETID_LEN, "%s!%s@%s",
+		 Client->id, Client->user, Client->host);
+	return Mask_Buffer;
 } /* Client_Mask */
 
 
+/**
+ * Return ID of a client with cloaked hostname: "client!user@server-name"
+ *
+ * This client ID is used for IRC prefixes, for example.
+ * Please note that this function uses a global static buffer, so you can't
+ * nest invocations without overwriting earlier results!
+ * If the client has not enabled cloaking, the real hostname is used.
+ *
+ * @param Client Pointer to client structure
+ * @return Pointer to global buffer containing the client ID
+ */
+GLOBAL char *
+Client_MaskCloaked(CLIENT *Client)
+{
+	static char Mask_Buffer[GETID_LEN];
+
+	assert (Client != NULL);
+
+	/* Is the client using cloaking at all? */
+	if (!Client_HasMode(Client, 'x'))
+		return Client_Mask(Client);
+
+	snprintf(Mask_Buffer, GETID_LEN, "%s!%s@%s", Client->id, Client->user,
+		 Client_HostnameDisplayed(Client));
+
+	return Mask_Buffer;
+} /* Client_MaskCloaked */
+
+
 GLOBAL CLIENT *
 Client_Introducer( CLIENT *Client )
 {
@@ -805,36 +982,71 @@ Client_HasMode( CLIENT *Client, char Mode )
 } /* Client_HasMode */
 
 
+GLOBAL bool
+Client_HasFlag( CLIENT *Client, char Flag )
+{
+	assert( Client != NULL );
+	return strchr( Client->flags, Flag ) != NULL;
+} /* Client_HasFlag */
+
+
 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 )
+GLOBAL char *
+Client_AccountName(CLIENT *Client)
 {
-	/* Nick ueberpruefen */
+	assert(Client != NULL);
+	return Client->account_name;
+}
 
-	assert( Client != NULL );
-	assert( Nick != NULL );
-	
-	/* Nick ungueltig? */
-	if( ! Client_IsValidNick( Nick ))
-	{
-		IRC_WriteStrClient( Client, ERR_ERRONEUSNICKNAME_MSG, Client_ID( Client ), Nick );
+
+/**
+ * Make sure that a given nickname is valid.
+ *
+ * If the nickname is not valid for the given client, this function sends back
+ * the appropriate error messages.
+ *
+ * @param	Client Client that wants to change the nickname.
+ * @param	Nick New nickname.
+ * @returns	true if nickname is valid, false otherwise.
+ */
+GLOBAL bool
+Client_CheckNick(CLIENT *Client, char *Nick)
+{
+	assert(Client != NULL);
+	assert(Nick != NULL);
+
+	if (!Client_IsValidNick(Nick)) {
+		if (strlen(Nick ) >= Conf_MaxNickLength)
+			IRC_WriteErrClient(Client, ERR_NICKNAMETOOLONG_MSG,
+					   Client_ID(Client), Nick,
+					   Conf_MaxNickLength - 1);
+		else
+			IRC_WriteErrClient(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 );
+	if (Client_Type(Client) != CLIENT_SERVER
+	    && Client_Type(Client) != CLIENT_SERVICE) {
+		/* Make sure that this isn't a restricted/forbidden nickname */
+		if (Conf_NickIsBlocked(Nick)) {
+			IRC_WriteErrClient(Client, ERR_FORBIDDENNICKNAME_MSG,
+					   Client_ID(Client), Nick);
+			return false;
+		}
+	}
+
+	/* Nickname already registered? */
+	if (Client_Search(Nick)) {
+		IRC_WriteErrClient(Client, ERR_NICKNAMEINUSE_MSG,
+			Client_ID(Client), Nick);
 		return false;
 	}
 
@@ -845,8 +1057,6 @@ Client_CheckNick( CLIENT *Client, char *Nick )
 GLOBAL bool
 Client_CheckID( CLIENT *Client, char *ID )
 {
-	/* Nick ueberpruefen */
-
 	char str[COMMAND_LEN];
 	CLIENT *c;
 
@@ -854,24 +1064,23 @@ Client_CheckID( CLIENT *Client, char *ID )
 	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 );
+	/* ID too long? */
+	if (strlen(ID) > CLIENT_ID_LEN) {
+		IRC_WriteErrClient(Client, ERR_ERRONEUSNICKNAME_MSG,
+				   Client_ID(Client), ID);
 		return false;
 	}
 
-	/* ID bereits vergeben? */
+	/* ID already in use? */
 	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);
+	while (c) {
+		if (strcasecmp(c->id, ID) == 0) {
+			snprintf(str, sizeof(str), "ID \"%s\" already registered", ID);
+			if (c->conn_id != NONE)
+				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;
@@ -884,8 +1093,6 @@ Client_CheckID( CLIENT *Client, char *ID )
 GLOBAL CLIENT *
 Client_First( void )
 {
-	/* Ersten Client liefern. */
-
 	return My_Clients;
 } /* Client_First */
 
@@ -893,9 +1100,6 @@ Client_First( void )
 GLOBAL CLIENT *
 Client_Next( CLIENT *c )
 {
-	/* Naechsten Client liefern. Existiert keiner,
-	 * so wird NULL geliefert. */
-
 	assert( c != NULL );
 	return (CLIENT *)c->next;
 } /* Client_Next */
@@ -936,13 +1140,12 @@ Client_MyServiceCount( void )
 } /* Client_MyServiceCount */
 
 
-GLOBAL long
+GLOBAL unsigned long
 Client_MyServerCount( void )
 {
 	CLIENT *c;
-	long cnt;
+	unsigned long cnt = 0;
 
-	cnt = 0;
 	c = My_Clients;
 	while( c )
 	{
@@ -953,36 +1156,36 @@ Client_MyServerCount( void )
 } /* Client_MyServerCount */
 
 
-GLOBAL long
+GLOBAL unsigned long
 Client_OperCount( void )
 {
 	CLIENT *c;
-	long cnt;
+	unsigned long cnt = 0;
 
-	cnt = 0;
 	c = My_Clients;
 	while( c )
 	{
-		if( c && ( c->type == CLIENT_USER ) && ( strchr( c->modes, 'o' ))) cnt++;
+		if (c && c->type == CLIENT_USER && Client_HasMode(c, 'o' ))
+			cnt++;
 		c = (CLIENT *)c->next;
 	}
 	return cnt;
 } /* Client_OperCount */
 
 
-GLOBAL long
+GLOBAL unsigned long
 Client_UnknownCount( void )
 {
 	CLIENT *c;
-	long cnt;
+	unsigned long cnt = 0;
 
-	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 */
 
@@ -1001,29 +1204,34 @@ Client_MyMaxUserCount( void )
 } /* Client_MyMaxUserCount */
 
 
+/**
+ * Check that a given nickname is valid.
+ *
+ * @param	Nick the nickname to check.
+ * @returns	true if nickname is valid, false otherwise.
+ */
 GLOBAL bool
-Client_IsValidNick( char *Nick )
+Client_IsValidNick(const char *Nick)
 {
-	/* Ist der Nick gueltig? */
-
-	char *ptr, goodchars[20];
-	
-	assert( Nick != NULL );
+	const char *ptr;
+	static const char goodchars[] = ";0123456789-";
 
-	strcpy( 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;
+	if (strchr(goodchars, Nick[0]))
+		return false;
+	if (strlen(Nick ) >= Conf_MaxNickLength)
+		return false;
 
 	ptr = Nick;
-	while( *ptr )
-	{
-		if(( *ptr < 'A' ) && ( ! strchr( goodchars, *ptr ))) return false;
-		if(( *ptr > '}' ) && ( ! strchr( goodchars, *ptr ))) return false;
+	while (*ptr) {
+		if (*ptr < 'A' && !strchr(goodchars, *ptr ))
+			return false;
+		if (*ptr > '}')
+			return false;
 		ptr++;
 	}
-	
+
 	return true;
 } /* Client_IsValidNick */
 
@@ -1060,13 +1268,85 @@ Client_StartTime(CLIENT *Client)
 } /* Client_Uptime */
 
 
-static long
+/**
+ * Reject a client when logging in.
+ *
+ * This function is called when a client isn't allowed to connect to this
+ * server. Possible reasons are bad server password, bad PAM password,
+ * or that the client is G/K-Line'd.
+ *
+ * After calling this function, the client isn't connected any more.
+ *
+ * @param Client The client to reject.
+ * @param Reason The reason why the client has been rejected.
+ * @param InformClient If true, send the exact reason to the client.
+ */
+GLOBAL void
+Client_Reject(CLIENT *Client, const char *Reason, bool InformClient)
+{
+	char info[COMMAND_LEN];
+
+	assert(Client != NULL);
+	assert(Reason != NULL);
+
+	if (InformClient)
+		snprintf(info, sizeof(info), "Access denied: %s", Reason);
+	else
+		strcpy(info, "Access denied: Bad password?");
+
+	Log(LOG_ERR,
+	    "User \"%s\" rejected (connection %d): %s!",
+	    Client_Mask(Client), Client_Conn(Client), Reason);
+	Conn_Close(Client_Conn(Client), Reason, info, true);
+}
+
+
+/**
+ * Introduce a new user or service client in the network.
+ *
+ * @param From Remote server introducing the client or NULL (local).
+ * @param Client New client.
+ * @param Type Type of the client (CLIENT_USER or CLIENT_SERVICE).
+ */
+GLOBAL void
+Client_Introduce(CLIENT *From, CLIENT *Client, int Type)
+{
+	/* Set client type (user or service) */
+	Client_SetType(Client, Type);
+
+	if (From) {
+		if (Conf_NickIsService(Conf_GetServer(Client_Conn(From)),
+				   Client_ID(Client)))
+			Client_SetType(Client, CLIENT_SERVICE);
+		LogDebug("%s \"%s\" (+%s) registered (via %s, on %s, %d hop%s).",
+			 Client_TypeText(Client), Client_Mask(Client),
+			 Client_Modes(Client), Client_ID(From),
+			 Client_ID(Client_Introducer(Client)),
+			 Client_Hops(Client), Client_Hops(Client) > 1 ? "s": "");
+	} else {
+		Log(LOG_NOTICE, "%s \"%s\" registered (connection %d).",
+		    Client_TypeText(Client), Client_Mask(Client),
+		    Client_Conn(Client));
+		Log_ServerNotice('c', "Client connecting: %s (%s@%s) [%s] - %s",
+			         Client_ID(Client), Client_User(Client),
+				 Client_Hostname(Client),
+				 Conn_IPA(Client_Conn(Client)),
+				 Client_TypeText(Client));
+	}
+
+	/* Inform other servers */
+	IRC_WriteStrServersPrefixFlag_CB(From,
+				From != NULL ? From : Client_ThisServer(),
+				'\0', cb_introduceClient, (void *)Client);
+} /* Client_Introduce */
+
+
+static unsigned long
 Count( CLIENT_TYPE Type )
 {
 	CLIENT *c;
-	long cnt;
+	unsigned long cnt = 0;
 
-	cnt = 0;
 	c = My_Clients;
 	while( c )
 	{
@@ -1077,13 +1357,12 @@ Count( CLIENT_TYPE Type )
 } /* Count */
 
 
-static long
+static unsigned long
 MyCount( CLIENT_TYPE Type )
 {
 	CLIENT *c;
-	long cnt;
+	unsigned long cnt = 0;
 
-	cnt = 0;
 	c = My_Clients;
 	while( c )
 	{
@@ -1094,13 +1373,16 @@ MyCount( CLIENT_TYPE Type )
 } /* MyCount */
 
 
+/**
+ * Allocate and initialize new CLIENT strcuture.
+ *
+ * @return Pointer to CLIENT structure or NULL on error.
+ */
 static CLIENT *
 New_Client_Struct( void )
 {
-	/* Neue CLIENT-Struktur pre-initialisieren */
-	
 	CLIENT *c;
-	
+
 	c = (CLIENT *)malloc( sizeof( CLIENT ));
 	if( ! c )
 	{
@@ -1112,14 +1394,34 @@ New_Client_Struct( void )
 
 	c->type = CLIENT_UNKNOWN;
 	c->conn_id = NONE;
-	c->oper_by_me = false;
 	c->hops = -1;
 	c->token = -1;
 	c->mytoken = -1;
 
 	return c;
-} /* New_Client */
+}
 
+/**
+ * Free a CLIENT structure and its member variables.
+ */
+static void
+Free_Client(CLIENT **Client)
+{
+	assert(Client != NULL);
+	assert(*Client != NULL);
+
+	if ((*Client)->account_name)
+		free((*Client)->account_name);
+	if ((*Client)->away)
+		free((*Client)->away);
+	if ((*Client)->cloaked)
+		free((*Client)->cloaked);
+	if ((*Client)->ipa_text)
+		free((*Client)->ipa_text);
+
+	free(*Client);
+	*Client = NULL;
+}
 
 static void
 Generate_MyToken( CLIENT *Client )
@@ -1133,7 +1435,7 @@ Generate_MyToken( CLIENT *Client )
 	{
 		if( c->mytoken == token )
 		{
-			/* Das Token wurde bereits vergeben */
+			/* The token is already in use */
 			token++;
 			c = My_Clients;
 			continue;
@@ -1141,7 +1443,7 @@ Generate_MyToken( CLIENT *Client )
 		else c = (CLIENT *)c->next;
 	}
 	Client->mytoken = token;
-	Log( LOG_DEBUG, "Assigned token %d to server \"%s\".", token, Client->id );
+	LogDebug("Assigned token %d to server \"%s\".", token, Client->id);
 } /* Generate_MyToken */
 
 
@@ -1153,7 +1455,7 @@ Adjust_Counters( CLIENT *Client )
 	assert( Client != NULL );
 
 	if( Client->type != CLIENT_USER ) return;
-	
+
 	if( Client->conn_id != NONE )
 	{
 		/* Local connection */
@@ -1175,11 +1477,17 @@ GLOBAL void
 Client_RegisterWhowas( CLIENT *Client )
 {
 	int slot;
-	
+	time_t now;
+
 	assert( Client != NULL );
 
+	/* Don't register WHOWAS information when "MorePrivacy" is enabled. */
+	if (Conf_MorePrivacy)
+		return;
+
+	now = time(NULL);
 	/* Don't register clients that were connected less than 30 seconds. */
-	if( time(NULL) - Client->starttime < 30 )
+	if( now - Client->starttime < 30 )
 		return;
 
 	slot = Last_Whowas + 1;
@@ -1188,21 +1496,220 @@ Client_RegisterWhowas( CLIENT *Client )
 #ifdef DEBUG
 	Log( LOG_DEBUG, "Saving WHOWAS information to slot %d ...", slot );
 #endif
-	
-	My_Whowas[slot].time = time( NULL );
+
+	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 ),
+	strlcpy( My_Whowas[slot].host, Client_HostnameDisplayed( 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 */
 
 
+GLOBAL const char *
+Client_TypeText(CLIENT *Client)
+{
+	assert(Client != NULL);
+	switch (Client_Type(Client)) {
+		case CLIENT_USER:
+			return "User";
+			break;
+		case CLIENT_SERVICE:
+			return "Service";
+			break;
+		case CLIENT_SERVER:
+			return "Server";
+			break;
+		default:
+			return "Client";
+	}
+} /* Client_TypeText */
+
+
+/**
+ * Destroy user or service client.
+ */
+static void
+Destroy_UserOrService(CLIENT *Client, const char *Txt, const char *FwdMsg, bool SendQuit)
+{
+	if(Client->conn_id != NONE) {
+		/* Local (directly connected) client */
+		Log(LOG_NOTICE,
+		    "%s \"%s\" unregistered (connection %d): %s.",
+		    Client_TypeText(Client), Client_Mask(Client),
+		    Client->conn_id, Txt);
+		Log_ServerNotice('c', "Client exiting: %s (%s@%s) [%s]",
+			         Client_ID(Client), Client_User(Client),
+				 Client_Hostname(Client), Txt);
+
+		if (SendQuit) {
+			/* Inforam all the other servers */
+			if (FwdMsg)
+				IRC_WriteStrServersPrefix(NULL,
+						Client, "QUIT :%s", FwdMsg );
+			else
+				IRC_WriteStrServersPrefix(NULL,
+						Client, "QUIT :");
+		}
+	} else {
+		/* Remote client */
+		LogDebug("%s \"%s\" unregistered: %s.",
+			 Client_TypeText(Client), Client_Mask(Client), Txt);
+
+		if(SendQuit) {
+			/* Inform all the other servers, but the ones in the
+			 * direction we got the QUIT from */
+			if(FwdMsg)
+				IRC_WriteStrServersPrefix(Client_NextHop(Client),
+						Client, "QUIT :%s", FwdMsg );
+			else
+				IRC_WriteStrServersPrefix(Client_NextHop(Client),
+						Client, "QUIT :" );
+		}
+	}
+
+	/* Unregister client from channels */
+	Channel_Quit(Client, FwdMsg ? FwdMsg : Client->id);
+
+	/* Register client in My_Whowas structure */
+	Client_RegisterWhowas(Client);
+} /* Destroy_UserOrService */
+
+
+/**
+ * Introduce a new user or service client to a remote server.
+ *
+ * @param To		The remote server to inform.
+ * @param Prefix	Prefix for the generated commands.
+ * @param data		CLIENT structure of the new client.
+ */
+static void
+cb_introduceClient(CLIENT *To, CLIENT *Prefix, void *data)
+{
+	CLIENT *c = (CLIENT *)data;
+
+	(void)Client_Announce(To, Prefix, c);
+
+} /* cb_introduceClient */
+
+
+/**
+ * Announce an user or service to a server.
+ *
+ * This function differentiates between RFC1459 and RFC2813 server links and
+ * generates the appropriate commands to register the user or service.
+ *
+ * @param Client	Server
+ * @param Prefix	Prefix for the generated commands
+ * @param User		User to announce
+ */
+GLOBAL bool
+Client_Announce(CLIENT * Client, CLIENT * Prefix, CLIENT * User)
+{
+	CONN_ID conn;
+	char *modes, *user, *host;
+
+	modes = Client_Modes(User);
+	user = Client_User(User) ? Client_User(User) : "-";
+	host = Client_Hostname(User) ? Client_Hostname(User) : "-";
+
+	conn = Client_Conn(Client);
+	if (Conn_Options(conn) & CONN_RFC1459) {
+		/* RFC 1459 mode: separate NICK and USER commands */
+		if (! Conn_WriteStr(conn, "NICK %s :%d",
+				    Client_ID(User), Client_Hops(User) + 1))
+			return DISCONNECTED;
+		if (! Conn_WriteStr(conn, ":%s USER %s %s %s :%s",
+				     Client_ID(User), user, host,
+				     Client_ID(Client_Introducer(User)),
+				     Client_Info(User)))
+			return DISCONNECTED;
+		if (modes[0]) {
+			if (! Conn_WriteStr(conn, ":%s MODE %s +%s",
+				     Client_ID(User), Client_ID(User),
+				     modes))
+				return DISCONNECTED;
+		}
+	} else {
+		/* RFC 2813 mode: one combined NICK or SERVICE command */
+		if (Client_Type(User) == CLIENT_SERVICE
+		    && Client_HasFlag(Client, 'S')) {
+			if (!IRC_WriteStrClientPrefix(Client, Prefix,
+					"SERVICE %s %d * +%s %d :%s",
+					Client_Mask(User),
+					Client_MyToken(Client_Introducer(User)),
+					modes, Client_Hops(User) + 1,
+					Client_Info(User)))
+				return DISCONNECTED;
+		} else {
+			if (!IRC_WriteStrClientPrefix(Client, Prefix,
+					"NICK %s %d %s %s %d +%s :%s",
+					Client_ID(User), Client_Hops(User) + 1,
+					user, host,
+					Client_MyToken(Client_Introducer(User)),
+					modes, Client_Info(User)))
+				return DISCONNECTED;
+		}
+	}
+
+	if (Client_HasFlag(Client, 'M')) {
+		/* Synchronize metadata */
+		if (Client_HostnameCloaked(User)) {
+			if (!IRC_WriteStrClientPrefix(Client, Prefix,
+					"METADATA %s cloakhost :%s",
+					Client_ID(User),
+					Client_HostnameCloaked(User)))
+				return DISCONNECTED;
+		}
+
+		if (Client_AccountName(User)) {
+			if (!IRC_WriteStrClientPrefix(Client, Prefix,
+					"METADATA %s accountname :%s",
+					Client_ID(User),
+					Client_AccountName(User)))
+				return DISCONNECTED;
+		}
+
+		if (Conn_GetCertFp(Client_Conn(User))) {
+			if (!IRC_WriteStrClientPrefix(Client, Prefix,
+					"METADATA %s certfp :%s",
+					Client_ID(User),
+					Conn_GetCertFp(Client_Conn(User))))
+				return DISCONNECTED;
+		}
+	}
+
+	return CONNECTED;
+} /* Client_Announce */
+
+
+#ifdef DEBUG
+
+GLOBAL void
+Client_DebugDump(void)
+{
+	CLIENT *c;
+
+	Log(LOG_DEBUG, "Client status:");
+	c = My_Clients;
+	while (c) {
+		Log(LOG_DEBUG,
+		    " - %s: type=%d, host=%s, user=%s, conn=%d, start=%ld, flags=%s",
+                   Client_ID(c), Client_Type(c), Client_Hostname(c),
+                   Client_User(c), Client_Conn(c), Client_StartTime(c),
+                   Client_Flags(c));
+		c = (CLIENT *)c->next;
+	}
+} /* Client_DumpClients */
+
+#endif
+
+
 /* -eof- */