X-Git-Url: https://arthur.barton.de/cgi-bin/gitweb.cgi?p=ngircd-alex.git;a=blobdiff_plain;f=src%2Fngircd%2Firc.c;h=37df06873bb30e99c78d91c360d23a09b9bbfec1;hp=8d7f6d37cb6c78f076c7afb9bfb33b215a9177ac;hb=d38d153f;hpb=bdaf53e799541bef5911f7793b901b2a5d56330a

diff --git a/src/ngircd/irc.c b/src/ngircd/irc.c
index 8d7f6d37..37df0687 100644
--- a/src/ngircd/irc.c
+++ b/src/ngircd/irc.c
@@ -1,20 +1,20 @@
 /*
  * ngIRCd -- The Next Generation IRC Daemon
- * Copyright (c)2001-2004 Alexander Barton <alex@barton.de>
+ * Copyright (c)2001-2012 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.
- *
- * IRC commands
  */
 
-
 #include "portab.h"
 
-static char UNUSED id[] = "$Id: irc.c,v 1.124 2004/02/28 02:18:16 alex Exp $";
+/**
+ * @file
+ * IRC commands
+ */
 
 #include "imp.h"
 #include <assert.h>
@@ -22,195 +22,241 @@ static char UNUSED id[] = "$Id: irc.c,v 1.124 2004/02/28 02:18:16 alex Exp $";
 #include <string.h>
 
 #include "ngircd.h"
-#include "conn.h"
-#include "resolve.h"
-#include "conf.h"
 #include "conn-func.h"
-#include "client.h"
+#include "conf.h"
 #include "channel.h"
+#include "conn-encoding.h"
 #include "defines.h"
 #include "irc-write.h"
 #include "log.h"
+#include "match.h"
 #include "messages.h"
 #include "parse.h"
+#include "tool.h"
 
 #include "exp.h"
 #include "irc.h"
 
 
-LOCAL CHAR *Option_String PARAMS(( CONN_ID Idx ));
+static char *Option_String PARAMS((CONN_ID Idx));
+static bool Send_Message PARAMS((CLIENT *Client, REQUEST *Req, int ForceType,
+				 bool SendErrors));
+static bool Send_Message_Mask PARAMS((CLIENT *from, char *command,
+				      char *targetMask, char *message,
+				      bool SendErrors));
+static bool Help PARAMS((CLIENT *Client, const char *Topic));
 
 
-GLOBAL BOOLEAN
+/**
+ * Check if a list limit is reached and inform client accordingly.
+ *
+ * @param From The client.
+ * @param Count Reply item count.
+ * @param Limit Reply limit.
+ * @param Name Name of the list.
+ * @return true if list limit has been reached; false otherwise.
+ */
+GLOBAL bool
+IRC_CheckListTooBig(CLIENT *From, const int Count, const int Limit,
+		    const char *Name)
+{
+	assert(From != NULL);
+	assert(Count >= 0);
+	assert(Limit > 0);
+	assert(Name != NULL);
+
+	if (Count < Limit)
+		return false;
+
+	(void)IRC_WriteStrClient(From,
+				 "NOTICE %s :%s list limit (%d) reached!",
+				 Client_ID(From), Name, Limit);
+	IRC_SetPenalty(From, 2);
+	return true;
+}
+
+
+GLOBAL bool
 IRC_ERROR( CLIENT *Client, REQUEST *Req )
 {
 	assert( Client != NULL );
 	assert( Req != NULL );
 
-	if( Req->argc < 1 ) Log( LOG_NOTICE, "Got ERROR from \"%s\"!", Client_Mask( Client ));
-	else Log( LOG_NOTICE, "Got ERROR from \"%s\": %s!", Client_Mask( Client ), Req->argv[0] );
+	if (Client_Type(Client) != CLIENT_GOTPASS
+	    && Client_Type(Client) != CLIENT_GOTPASS_2813
+	    && Client_Type(Client) != CLIENT_UNKNOWNSERVER
+	    && Client_Type(Client) != CLIENT_SERVER
+	    && Client_Type(Client) != CLIENT_SERVICE) {
+		LogDebug("Ignored ERROR command from \"%s\" ...",
+			 Client_Mask(Client));
+		IRC_SetPenalty(Client, 2);
+		return CONNECTED;
+	}
+
+	if (Req->argc < 1)
+		Log(LOG_NOTICE, "Got ERROR from \"%s\"!",
+		    Client_Mask(Client));
+	else
+		Log(LOG_NOTICE, "Got ERROR from \"%s\": \"%s\"!",
+		    Client_Mask(Client), Req->argv[0]);
 
 	return CONNECTED;
 } /* IRC_ERROR */
 
 
-GLOBAL BOOLEAN
+/**
+ * Handler for the IRC "KILL" command.
+ *
+ * This function implements the IRC command "KILL" wich is used to selectively
+ * disconnect clients. It can be used by IRC operators and servers, for example
+ * to "solve" nick collisions after netsplits. See RFC 2812 section 3.7.1.
+ *
+ * Please note that this function is also called internally, without a real
+ * KILL command being received over the network! Client is Client_ThisServer()
+ * in this case, and the prefix in Req is NULL.
+ *
+ * @param Client	The client from which this command has been received
+ *			or Client_ThisServer() when generated interanlly.
+ * @param Req		Request structure with prefix and all parameters.
+ * @returns		CONNECTED or DISCONNECTED.
+ */
+GLOBAL bool
 IRC_KILL( CLIENT *Client, REQUEST *Req )
 {
 	CLIENT *prefix, *c;
-	CHAR reason[COMMAND_LEN];
+	char reason[COMMAND_LEN], *msg;
 	CONN_ID my_conn, conn;
 
-	assert( Client != NULL );
-	assert( Req != NULL );
-
-	/* Is the user an IRC operator? */
-	if(( Client_Type( Client ) != CLIENT_SERVER ) && ( ! Client_OperByMe( Client ))) return IRC_WriteStrClient( Client, ERR_NOPRIVILEGES_MSG, Client_ID( Client ));
-
-	/* Bad number of parameters? */
-	if(( Req->argc != 2 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
-
-	if( Req->prefix ) prefix = Client_Search( Req->prefix );
-	else prefix = Client;
-	if( ! prefix )
-	{
-		Log( LOG_WARNING, "Got KILL with invalid prefix: \"%s\"!", Req->prefix );
-		prefix = Client_ThisServer( );
+	assert (Client != NULL);
+	assert (Req != NULL);
+
+	if (Client_Type(Client) != CLIENT_SERVER && !Client_OperByMe(Client))
+		return IRC_WriteStrClient(Client, ERR_NOPRIVILEGES_MSG,
+					  Client_ID(Client));
+
+	if (Req->argc != 2)
+		return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
+					  Client_ID(Client), Req->command);
+
+	/* Get prefix (origin); use the client if no prefix is given. */
+	if (Req->prefix)
+		prefix = Client_Search(Req->prefix);
+	else
+		prefix = Client;
+
+	/* Log a warning message and use this server as origin when the
+	 * prefix (origin) is invalid. */
+	if (!prefix) {
+		Log(LOG_WARNING, "Got KILL with invalid prefix: \"%s\"!",
+		    Req->prefix );
+		prefix = Client_ThisServer();
 	}
 
-	if( Client != Client_ThisServer( )) Log( LOG_NOTICE|LOG_snotice, "Got KILL command from \"%s\" for \"%s\": %s", Client_Mask( prefix ), Req->argv[0], Req->argv[1] );
+	if (Client != Client_ThisServer())
+		Log(LOG_NOTICE|LOG_snotice,
+		    "Got KILL command from \"%s\" for \"%s\": \"%s\".",
+		    Client_Mask(prefix), Req->argv[0], Req->argv[1]);
 
-	/* Build reason string */
-	if( Client_Type( Client ) == CLIENT_USER ) snprintf( reason, sizeof( reason ), "KILLed by %s: %s", Client_ID( Client ), Req->argv[1] );
-	else strlcpy( reason, Req->argv[1], sizeof( reason ));
+	/* Build reason string: Prefix the "reason" if the originator is a
+	 * regular user, so users can't spoof KILLs of servers. */
+	if (Client_Type(Client) == CLIENT_USER)
+		snprintf(reason, sizeof(reason), "KILLed by %s: %s",
+			 Client_ID(Client), Req->argv[1]);
+	else
+		strlcpy(reason, Req->argv[1], sizeof(reason));
 
 	/* Inform other servers */
-	IRC_WriteStrServersPrefix( Client, prefix, "KILL %s :%s", Req->argv[0], reason );
+	IRC_WriteStrServersPrefix(Client, prefix, "KILL %s :%s",
+				  Req->argv[0], reason);
 
 	/* Save ID of this connection */
 	my_conn = Client_Conn( Client );
-	
+
 	/* Do we host such a client? */
 	c = Client_Search( Req->argv[0] );
 	if( c )
 	{
-		/* Yes, there is such a client -- but is it a valid user? */
-		if( Client_Type( c ) == CLIENT_SERVER )
+		if(( Client_Type( c ) != CLIENT_USER ) &&
+		   ( Client_Type( c ) != CLIENT_GOTNICK ))
 		{
-			if( Client != Client_ThisServer( )) IRC_WriteStrClient( Client, ERR_CANTKILLSERVER_MSG, Client_ID( Client ));
-			else
-			{
-				/* Oops, I should kill another server!? */
-				Log( LOG_ERR, "Can't KILL server \"%s\"!", Req->argv[0] );
-				conn = Client_Conn( Client_NextHop( c ));
-				assert( conn > NONE );
-				Conn_Close( conn, NULL, "Nick collision for server!?", TRUE );
-			}
-		}
-		else if( Client_Type( c ) != CLIENT_USER  )
-		{
-			if( Client != Client_ThisServer( )) IRC_WriteStrClient( Client, ERR_NOPRIVILEGES_MSG, Client_ID( Client ));
-			else
+			/* Target of this KILL is not a regular user, this is
+			 * invalid! So we ignore this case if we received a
+			 * regular KILL from the network and try to kill the
+			 * client/connection anyway (but log an error!) if the
+			 * origin is the local server. */
+
+			if( Client != Client_ThisServer( ))
 			{
-				/* Oops, what sould I close?? */
-				Log( LOG_ERR, "Can't KILL \"%s\": invalid client type!", Req->argv[0] );
-				conn = Client_Conn( Client_NextHop( c ));
-				assert( conn > NONE );
-				Conn_Close( conn, NULL, "Collision for invalid client type!?", TRUE );
+				/* Invalid KILL received from remote */
+				if( Client_Type( c ) == CLIENT_SERVER )
+					msg = ERR_CANTKILLSERVER_MSG;
+				else
+					msg = ERR_NOPRIVILEGES_MSG;
+				return IRC_WriteStrClient( Client, msg,
+					Client_ID( Client ));
 			}
+
+			Log( LOG_ERR, "Got KILL for invalid client type: %d, \"%s\"!",
+			     Client_Type( c ), Req->argv[0] );
 		}
+
+		/* Kill the client NOW:
+		 *  - Close the local connection (if there is one),
+		 *  - Destroy the CLIENT structure for remote clients.
+		 * Note: Conn_Close() removes the CLIENT structure as well. */
+		conn = Client_Conn( c );
+		if(conn > NONE)
+			Conn_Close(conn, NULL, reason, true);
 		else
-		{
-			/* Kill user NOW! */
-			conn = Client_Conn( c );
-			Client_Destroy( c, NULL, reason, FALSE );
-			if( conn != NONE ) Conn_Close( conn, NULL, reason, TRUE );
-		}
+			Client_Destroy(c, NULL, reason, false);
 	}
-	else Log( LOG_NOTICE, "Client with nick \"%s\" is unknown here.", Req->argv[0] );
+	else
+		Log( LOG_NOTICE, "Client with nick \"%s\" is unknown here.", Req->argv[0] );
 
 	/* Are we still connected or were we killed, too? */
-	if(( my_conn > NONE ) && ( Client_GetFromConn( my_conn ))) return CONNECTED;
-	else return DISCONNECTED;
+	if(( my_conn > NONE ) && ( Conn_GetClient( my_conn )))
+		return CONNECTED;
+	else
+		return DISCONNECTED;
 } /* IRC_KILL */
 
 
-GLOBAL BOOLEAN
-IRC_NOTICE( CLIENT *Client, REQUEST *Req )
+/**
+ * Handler for the IRC command NOTICE.
+ */
+GLOBAL bool
+IRC_NOTICE(CLIENT *Client, REQUEST *Req)
 {
-	CLIENT *to, *from;
-
-	assert( Client != NULL );
-	assert( Req != NULL );
-
-	if(( Client_Type( Client ) != CLIENT_USER ) && ( Client_Type( Client ) != CLIENT_SERVER )) return CONNECTED;
-
-	/* Falsche Anzahl Parameter? */
-	if( Req->argc != 2 ) return CONNECTED;
-
-	if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
-	else from = Client;
-	if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
-
-	to = Client_Search( Req->argv[0] );
-	if(( to ) && ( Client_Type( to ) == CLIENT_USER ))
-	{
-		/* Okay, Ziel ist ein User */
-		return IRC_WriteStrClientPrefix( to, from, "NOTICE %s :%s", Client_ID( to ), Req->argv[1] );
-	}
-	else return CONNECTED;
+	return Send_Message(Client, Req, CLIENT_USER, false);
 } /* IRC_NOTICE */
 
 
-GLOBAL BOOLEAN
-IRC_PRIVMSG( CLIENT *Client, REQUEST *Req )
+/**
+ * Handler for the IRC command PRIVMSG.
+ */
+GLOBAL bool
+IRC_PRIVMSG(CLIENT *Client, REQUEST *Req)
 {
-	CLIENT *cl, *from;
-	CHANNEL *chan;
-	
-	assert( Client != NULL );
-	assert( Req != NULL );
-
-	/* Falsche Anzahl Parameter? */
-	if( Req->argc == 0 ) return IRC_WriteStrClient( Client, ERR_NORECIPIENT_MSG, Client_ID( Client ), Req->command );
-	if( Req->argc == 1 ) return IRC_WriteStrClient( Client, ERR_NOTEXTTOSEND_MSG, Client_ID( Client ));
-	if( Req->argc > 2 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
-
-	if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
-	else from = Client;
-	if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
-
-	cl = Client_Search( Req->argv[0] );
-	if( cl )
-	{
-		/* Okay, Ziel ist ein Client. Aber ist es auch ein User? */
-		if( Client_Type( cl ) != CLIENT_USER ) return IRC_WriteStrClient( from, ERR_NOSUCHNICK_MSG, Client_ID( from ), Req->argv[0] );
-
-		/* Okay, Ziel ist ein User */
-		if(( Client_Type( Client ) != CLIENT_SERVER ) && ( strchr( Client_Modes( cl ), 'a' )))
-		{
-			/* Ziel-User ist AWAY: Meldung verschicken */
-			if( ! IRC_WriteStrClient( from, RPL_AWAY_MSG, Client_ID( from ), Client_ID( cl ), Client_Away( cl ))) return DISCONNECTED;
-		}
-
-		/* Text senden */
-		if( Client_Conn( from ) > NONE ) Conn_UpdateIdle( Client_Conn( from ));
-		return IRC_WriteStrClientPrefix( cl, from, "PRIVMSG %s :%s", Client_ID( cl ), Req->argv[1] );
-	}
+	return Send_Message(Client, Req, CLIENT_USER, true);
+} /* IRC_PRIVMSG */
 
-	chan = Channel_Search( Req->argv[0] );
-	if( chan ) return Channel_Write( chan, from, Client, Req->argv[1] );
 
-	return IRC_WriteStrClient( from, ERR_NOSUCHNICK_MSG, Client_ID( from ), Req->argv[0] );
-} /* IRC_PRIVMSG */
+/**
+ * Handler for the IRC command SQUERY.
+ */
+GLOBAL bool
+IRC_SQUERY(CLIENT *Client, REQUEST *Req)
+{
+	return Send_Message(Client, Req, CLIENT_SERVICE, true);
+} /* IRC_SQUERY */
 
 
-GLOBAL BOOLEAN
+GLOBAL bool
 IRC_TRACE( CLIENT *Client, REQUEST *Req )
 {
 	CLIENT *from, *target, *c;
 	CONN_ID idx, idx2;
-	CHAR user[CLIENT_USER_LEN];
+	char user[CLIENT_USER_LEN];
 
 	assert( Client != NULL );
 	assert( Req != NULL );
@@ -270,44 +316,423 @@ IRC_TRACE( CLIENT *Client, REQUEST *Req )
 } /* IRC_TRACE */
 
 
-GLOBAL BOOLEAN
-IRC_HELP( CLIENT *Client, REQUEST *Req )
+/**
+ * Handler for the IRC "HELP" command.
+ *
+ * @param Client The client from which this command has been received.
+ * @param Req Request structure with prefix and all parameters.
+ * @return CONNECTED or DISCONNECTED.
+ */
+GLOBAL bool
+IRC_HELP(CLIENT *Client, REQUEST *Req)
 {
 	COMMAND *cmd;
 
-	assert( Client != NULL );
-	assert( Req != NULL );
+	assert(Client != NULL);
+	assert(Req != NULL);
 
 	/* Bad number of arguments? */
-	if( Req->argc > 0 ) return IRC_WriteStrClient( Client, ERR_NORECIPIENT_MSG, Client_ID( Client ), Req->command );
+	if (Req->argc > 1)
+		return IRC_WriteStrClient(Client, ERR_NORECIPIENT_MSG,
+					  Client_ID(Client), Req->command);
 
-	cmd = Parse_GetCommandStruct( );
-	while( cmd->name )
-	{
-		if( ! IRC_WriteStrClient( Client, "NOTICE %s :%s", Client_ID( Client ), cmd->name )) return DISCONNECTED;
+	IRC_SetPenalty(Client, 2);
+
+	if ((Req->argc == 0 && array_bytes(&Conf_Helptext) > 0)
+	    || (Req->argc >= 1 && strcasecmp(Req->argv[0], "Commands") != 0)) {
+		/* Help text available and requested */
+		if (Req->argc >= 1)
+			return Help(Client, Req->argv[0]);
+
+		if (!Help(Client, "Intro"))
+			return DISCONNECTED;
+		return CONNECTED;
+	}
+
+	cmd = Parse_GetCommandStruct();
+	while(cmd->name) {
+		if (!IRC_WriteStrClient(Client, "NOTICE %s :%s",
+					Client_ID(Client), cmd->name))
+			return DISCONNECTED;
 		cmd++;
 	}
-	
-	IRC_SetPenalty( Client, 2 );
 	return CONNECTED;
 } /* IRC_HELP */
 
 
-LOCAL CHAR *
-Option_String( CONN_ID Idx )
+/**
+ * Send help for a given topic to the client.
+ *
+ * @param Client The client requesting help.
+ * @param Topoc The help topic requested.
+ * @return CONNECTED or DISCONNECTED.
+ */
+static bool
+Help(CLIENT *Client, const char *Topic)
+{
+	char *line;
+	size_t helptext_len, len_str, idx_start, lines = 0;
+	bool in_article = false;
+
+	assert(Client != NULL);
+	assert(Topic != NULL);
+
+	helptext_len = array_bytes(&Conf_Helptext);
+	line = array_start(&Conf_Helptext);
+	while (helptext_len > 0) {
+		len_str = strlen(line) + 1;
+		assert(helptext_len >= len_str);
+		helptext_len -= len_str;
+
+		if (in_article) {
+			/* The first character in each article text line must
+			 * be a TAB (ASCII 9) character which will be stripped
+			 * in the output. If it is not a TAB, the end of the
+			 * article has been reached. */
+			if (line[0] != '\t') {
+				if (lines > 0)
+					return CONNECTED;
+				else
+					break;
+			}
+
+			/* A single '.' character indicates an empty line */
+			if (line[1] == '.' && line[2] == '\0')
+				idx_start = 2;
+			else
+				idx_start = 1;
+
+			if (!IRC_WriteStrClient(Client, "NOTICE %s :%s",
+						Client_ID(Client),
+						&line[idx_start]))
+				return DISCONNECTED;
+			lines++;
+
+		} else {
+			if (line[0] == '-' && line[1] == ' '
+			    && strcasecmp(&line[2], Topic) == 0)
+				in_article = true;
+		}
+
+		line += len_str;
+	}
+
+	/* Help topic not found (or empty)! */
+	if (!IRC_WriteStrClient(Client, "NOTICE %s :No help for \"%s\" found!",
+				Client_ID(Client), Topic))
+		return DISCONNECTED;
+
+	return CONNECTED;
+}
+
+
+static char *
+#ifdef ZLIB
+Option_String(CONN_ID Idx)
+#else
+Option_String(UNUSED CONN_ID Idx)
+#endif
 {
-	STATIC CHAR option_txt[8];
-	INT options;
+	static char option_txt[8];
+#ifdef ZLIB
+	UINT16 options;
 
-	options = Conn_Options( Idx );
+	options = Conn_Options(Idx);
+#endif
 
-	strcpy( option_txt, "F" );	/* No idea what this means but the original ircd sends it ... */
+	strcpy(option_txt, "F");	/* No idea what this means, but the
+					 * original ircd sends it ... */
 #ifdef ZLIB
-	if( options & CONN_ZIP ) strcat( option_txt, "z" );
+	if(options & CONN_ZIP)		/* zlib compression supported. */
+		strcat(option_txt, "z");
 #endif
 
 	return option_txt;
 } /* Option_String */
 
 
+static bool
+Send_Message(CLIENT * Client, REQUEST * Req, int ForceType, bool SendErrors)
+{
+	CLIENT *cl, *from;
+	CL2CHAN *cl2chan;
+	CHANNEL *chan;
+	char *currentTarget = Req->argv[0];
+	char *lastCurrentTarget = NULL;
+	char *message = NULL;
+
+	assert(Client != NULL);
+	assert(Req != NULL);
+
+	if (Req->argc == 0) {
+		if (!SendErrors)
+			return CONNECTED;
+		return IRC_WriteStrClient(Client, ERR_NORECIPIENT_MSG,
+					  Client_ID(Client), Req->command);
+	}
+	if (Req->argc == 1) {
+		if (!SendErrors)
+			return CONNECTED;
+		return IRC_WriteStrClient(Client, ERR_NOTEXTTOSEND_MSG,
+					  Client_ID(Client));
+	}
+	if (Req->argc > 2) {
+		if (!SendErrors)
+			return CONNECTED;
+		return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
+					  Client_ID(Client), Req->command);
+	}
+
+	if (Client_Type(Client) == CLIENT_SERVER)
+		from = Client_Search(Req->prefix);
+	else
+		from = Client;
+	if (!from)
+		return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
+					  Client_ID(Client), Req->prefix);
+
+#ifdef ICONV
+	if (Client_Conn(Client) > NONE)
+		message = Conn_EncodingFrom(Client_Conn(Client), Req->argv[1]);
+	else
+#endif
+		message = Req->argv[1];
+
+	/* handle msgtarget = msgto *("," msgto) */
+	currentTarget = strtok_r(currentTarget, ",", &lastCurrentTarget);
+	ngt_UpperStr(Req->command);
+
+	while (currentTarget) {
+		/* Check for and handle valid <msgto> of form:
+		 * RFC 2812 2.3.1:
+		 *   msgto =  channel / ( user [ "%" host ] "@" servername )
+		 *   msgto =/ ( user "%" host ) / targetmask
+		 *   msgto =/ nickname / ( nickname "!" user "@" host )
+		 */
+		if (strchr(currentTarget, '!') == NULL)
+			/* nickname */
+			cl = Client_Search(currentTarget);
+		else
+			cl = NULL;
+
+		if (cl == NULL) {
+			/* If currentTarget isn't a nickname check for:
+			 * user ["%" host] "@" servername
+			 * user "%" host
+			 * nickname "!" user "@" host
+			 */
+			char target[COMMAND_LEN];
+			char * nick = NULL;
+			char * user = NULL;
+			char * host = NULL;
+			char * server = NULL;
+
+			strlcpy(target, currentTarget, COMMAND_LEN);
+			server = strchr(target, '@');
+			if (server) {
+				*server = '\0';
+				server++;
+			}
+			host = strchr(target, '%');
+			if (host) {
+				*host = '\0';
+				host++;
+			}
+			user = strchr(target, '!');
+			if (user) {
+				/* msgto form: nick!user@host */
+				*user = '\0';
+				user++;
+				nick = target;
+				host = server; /* not "@server" but "@host" */
+			} else {
+				user = target;
+			}
+
+			for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
+				if (Client_Type(cl) != CLIENT_USER &&
+				    Client_Type(cl) != CLIENT_SERVICE)
+					continue;
+				if (nick != NULL && host != NULL) {
+					if (strcasecmp(nick, Client_ID(cl)) == 0 &&
+					    strcasecmp(user, Client_User(cl)) == 0 &&
+					    strcasecmp(host, Client_HostnameDisplayed(cl)) == 0)
+						break;
+					else
+						continue;
+				}
+				if (strcasecmp(user, Client_User(cl)) != 0)
+					continue;
+				if (host != NULL && strcasecmp(host,
+						Client_HostnameDisplayed(cl)) != 0)
+					continue;
+				if (server != NULL && strcasecmp(server,
+						Client_ID(Client_Introducer(cl))) != 0)
+					continue;
+				break;
+			}
+		}
+
+		if (cl) {
+			/* Target is a user, enforce type */
+#ifndef STRICT_RFC
+			if (Client_Type(cl) != ForceType &&
+			    !(ForceType == CLIENT_USER &&
+			      (Client_Type(cl) == CLIENT_USER ||
+			       Client_Type(cl) == CLIENT_SERVICE))) {
+#else
+			if (Client_Type(cl) != ForceType) {
+#endif
+				if (SendErrors && !IRC_WriteStrClient(
+				    from, ERR_NOSUCHNICK_MSG,Client_ID(from),
+				    currentTarget))
+					return DISCONNECTED;
+				goto send_next_target;
+			}
+
+#ifndef STRICT_RFC
+			if (ForceType == CLIENT_SERVICE &&
+			    (Conn_Options(Client_Conn(Client_NextHop(cl)))
+			     & CONN_RFC1459)) {
+				/* SQUERY command but RFC 1459 link: convert
+				 * request to PRIVMSG command */
+				Req->command = "PRIVMSG";
+			}
+#endif
+			if (Client_HasMode(cl, 'b') &&
+			    !Client_HasMode(from, 'R') &&
+			    !Client_HasMode(from, 'o') &&
+			    !(Client_Type(from) == CLIENT_SERVER) &&
+			    !(Client_Type(from) == CLIENT_SERVICE)) {
+				if (SendErrors && !IRC_WriteStrClient(from,
+						ERR_NONONREG_MSG,
+						Client_ID(from), Client_ID(cl)))
+					return DISCONNECTED;
+				goto send_next_target;
+			}
+
+			if (Client_HasMode(cl, 'C')) {
+				cl2chan = Channel_FirstChannelOf(cl);
+				while (cl2chan) {
+					chan = Channel_GetChannel(cl2chan);
+					if (Channel_IsMemberOf(chan, from))
+						break;
+					cl2chan = Channel_NextChannelOf(cl, cl2chan);
+				}
+				if (!cl2chan) {
+					if (SendErrors && !IRC_WriteStrClient(
+					    from, ERR_NOTONSAMECHANNEL_MSG,
+					    Client_ID(from), Client_ID(cl)))
+						return DISCONNECTED;
+					goto send_next_target;
+				}
+			}
+
+			if (SendErrors && (Client_Type(Client) != CLIENT_SERVER)
+			    && strchr(Client_Modes(cl), 'a')) {
+				/* Target is away */
+				if (!IRC_WriteStrClient(from, RPL_AWAY_MSG,
+							Client_ID(from),
+							Client_ID(cl),
+							Client_Away(cl)))
+					return DISCONNECTED;
+			}
+			if (Client_Conn(from) > NONE) {
+				Conn_UpdateIdle(Client_Conn(from));
+			}
+			if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
+						      Req->command, Client_ID(cl),
+						      message))
+				return DISCONNECTED;
+		} else if (ForceType != CLIENT_SERVICE
+			   && (chan = Channel_Search(currentTarget))) {
+			if (!Channel_Write(chan, from, Client, Req->command,
+					   SendErrors, message))
+					return DISCONNECTED;
+		} else if (ForceType != CLIENT_SERVICE
+			/* $#: server/target mask, RFC 2812, sec. 3.3.1 */
+			   && strchr("$#", currentTarget[0])
+			   && strchr(currentTarget, '.')) {
+			/* targetmask */
+			if (!Send_Message_Mask(from, Req->command, currentTarget,
+					       message, SendErrors))
+				return DISCONNECTED;
+		} else {
+			if (!SendErrors)
+				return CONNECTED;
+			if (!IRC_WriteStrClient(from, ERR_NOSUCHNICK_MSG,
+						Client_ID(from), currentTarget))
+				return DISCONNECTED;
+		}
+
+	send_next_target:
+		currentTarget = strtok_r(NULL, ",", &lastCurrentTarget);
+		if (currentTarget)
+			Conn_SetPenalty(Client_Conn(Client), 1);
+	}
+
+	return CONNECTED;
+} /* Send_Message */
+
+
+static bool
+Send_Message_Mask(CLIENT * from, char * command, char * targetMask,
+		  char * message, bool SendErrors)
+{
+	CLIENT *cl;
+	bool client_match;
+	char *mask = targetMask + 1;
+	const char *check_wildcards;
+
+	cl = NULL;
+
+	if (strchr(Client_Modes(from), 'o') == NULL) {
+		if (!SendErrors)
+			return true;
+		return IRC_WriteStrClient(from, ERR_NOPRIVILEGES_MSG,
+					  Client_ID(from));
+	}
+
+	/*
+	 * RFC 2812, sec. 3.3.1 requires that targetMask have at least one
+	 * dot (".") and no wildcards ("*", "?") following the last one.
+	 */
+	check_wildcards = strrchr(targetMask, '.');
+	assert(check_wildcards != NULL);
+	if (check_wildcards &&
+		check_wildcards[strcspn(check_wildcards, "*?")])
+	{
+		if (!SendErrors)
+			return true;
+		return IRC_WriteStrClient(from, ERR_WILDTOPLEVEL, targetMask);
+	}
+
+	/* #: hostmask, see RFC 2812, sec. 3.3.1 */
+	if (targetMask[0] == '#') {
+		for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
+			if (Client_Type(cl) != CLIENT_USER)
+				continue;
+			client_match = MatchCaseInsensitive(mask, Client_Hostname(cl));
+			if (client_match)
+				if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
+						command, Client_ID(cl), message))
+					return false;
+		}
+	} else {
+		assert(targetMask[0] == '$'); /* $: server mask, see RFC 2812, sec. 3.3.1 */
+		for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
+			if (Client_Type(cl) != CLIENT_USER)
+				continue;
+			client_match = MatchCaseInsensitive(mask,
+					Client_ID(Client_Introducer(cl)));
+			if (client_match)
+				if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
+						command, Client_ID(cl), message))
+					return false;
+		}
+	}
+	return CONNECTED;
+} /* Send_Message_Mask */
+
+
 /* -eof- */