620 lines
17 KiB
C
620 lines
17 KiB
C
/*
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* ngIRCd -- The Next Generation IRC Daemon
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* Copyright (c)2001-2012 Alexander Barton (alex@barton.de) and Contributors.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* Please read the file COPYING, README and AUTHORS for more information.
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*/
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#include "portab.h"
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/**
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* @file
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* IRC commands
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*/
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#include "imp.h"
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#include <assert.h>
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#include <stdio.h>
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#include <string.h>
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#include "ngircd.h"
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#include "conn-func.h"
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#include "conf.h"
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#include "channel.h"
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#include "defines.h"
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#include "irc-write.h"
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#include "log.h"
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#include "match.h"
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#include "messages.h"
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#include "parse.h"
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#include "tool.h"
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#include "exp.h"
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#include "irc.h"
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static char *Option_String PARAMS((CONN_ID Idx));
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static bool Send_Message PARAMS((CLIENT *Client, REQUEST *Req, int ForceType,
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bool SendErrors));
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static bool Send_Message_Mask PARAMS((CLIENT *from, char *command,
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char *targetMask, char *message,
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bool SendErrors));
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/**
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* Check if a list limit is reached and inform client accordingly.
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*
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* @param From The client.
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* @param Count Reply item count.
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* @param Limit Reply limit.
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* @param Name Name of the list.
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* @return true if list limit has been reached; false otherwise.
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*/
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GLOBAL bool
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IRC_CheckListTooBig(CLIENT *From, const int Count, const int Limit,
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const char *Name)
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{
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assert(From != NULL);
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assert(Count >= 0);
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assert(Limit > 0);
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assert(Name != NULL);
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if (Count < Limit)
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return false;
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(void)IRC_WriteStrClient(From,
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"NOTICE %s :%s list limit (%d) reached!",
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Client_ID(From), Name, Limit);
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IRC_SetPenalty(From, 2);
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return true;
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}
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GLOBAL bool
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IRC_ERROR( CLIENT *Client, REQUEST *Req )
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{
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assert( Client != NULL );
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assert( Req != NULL );
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if (Req->argc < 1)
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Log(LOG_NOTICE, "Got ERROR from \"%s\"!",
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Client_Mask(Client));
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else
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Log(LOG_NOTICE, "Got ERROR from \"%s\": \"%s\"!",
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Client_Mask(Client), Req->argv[0]);
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return CONNECTED;
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} /* IRC_ERROR */
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/**
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* Handler for the IRC "KILL" command.
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*
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* This function implements the IRC command "KILL" wich is used to selectively
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* disconnect clients. It can be used by IRC operators and servers, for example
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* to "solve" nick collisions after netsplits. See RFC 2812 section 3.7.1.
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*
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* Please note that this function is also called internally, without a real
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* KILL command being received over the network! Client is Client_ThisServer()
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* in this case, and the prefix in Req is NULL.
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*
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* @param Client The client from which this command has been received
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* or Client_ThisServer() when generated interanlly.
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* @param Req Request structure with prefix and all parameters.
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* @returns CONNECTED or DISCONNECTED.
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*/
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GLOBAL bool
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IRC_KILL( CLIENT *Client, REQUEST *Req )
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{
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CLIENT *prefix, *c;
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char reason[COMMAND_LEN], *msg;
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CONN_ID my_conn, conn;
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assert (Client != NULL);
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assert (Req != NULL);
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if (Client_Type(Client) != CLIENT_SERVER && !Client_OperByMe(Client))
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return IRC_WriteStrClient(Client, ERR_NOPRIVILEGES_MSG,
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Client_ID(Client));
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if (Req->argc != 2)
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return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
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Client_ID(Client), Req->command);
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/* Get prefix (origin); use the client if no prefix is given. */
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if (Req->prefix)
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prefix = Client_Search(Req->prefix);
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else
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prefix = Client;
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/* Log a warning message and use this server as origin when the
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* prefix (origin) is invalid. */
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if (!prefix) {
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Log(LOG_WARNING, "Got KILL with invalid prefix: \"%s\"!",
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Req->prefix );
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prefix = Client_ThisServer();
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}
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if (Client != Client_ThisServer())
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Log(LOG_NOTICE|LOG_snotice,
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"Got KILL command from \"%s\" for \"%s\": %s",
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Client_Mask(prefix), Req->argv[0], Req->argv[1]);
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/* Build reason string: Prefix the "reason" if the originator is a
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* regular user, so users can't spoof KILLs of servers. */
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if (Client_Type(Client) == CLIENT_USER)
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snprintf(reason, sizeof(reason), "KILLed by %s: %s",
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Client_ID(Client), Req->argv[1]);
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else
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strlcpy(reason, Req->argv[1], sizeof(reason));
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/* Inform other servers */
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IRC_WriteStrServersPrefix(Client, prefix, "KILL %s :%s",
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Req->argv[0], reason);
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/* Save ID of this connection */
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my_conn = Client_Conn( Client );
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/* Do we host such a client? */
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c = Client_Search( Req->argv[0] );
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if( c )
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{
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if(( Client_Type( c ) != CLIENT_USER ) &&
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( Client_Type( c ) != CLIENT_GOTNICK ))
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{
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/* Target of this KILL is not a regular user, this is
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* invalid! So we ignore this case if we received a
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* regular KILL from the network and try to kill the
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* client/connection anyway (but log an error!) if the
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* origin is the local server. */
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if( Client != Client_ThisServer( ))
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{
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/* Invalid KILL received from remote */
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if( Client_Type( c ) == CLIENT_SERVER )
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msg = ERR_CANTKILLSERVER_MSG;
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else
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msg = ERR_NOPRIVILEGES_MSG;
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return IRC_WriteStrClient( Client, msg,
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Client_ID( Client ));
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}
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Log( LOG_ERR, "Got KILL for invalid client type: %d, \"%s\"!",
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Client_Type( c ), Req->argv[0] );
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}
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/* Kill the client NOW:
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* - Close the local connection (if there is one),
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* - Destroy the CLIENT structure for remote clients.
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* Note: Conn_Close() removes the CLIENT structure as well. */
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conn = Client_Conn( c );
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if(conn > NONE)
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Conn_Close(conn, NULL, reason, true);
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else
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Client_Destroy(c, NULL, reason, false);
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}
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else
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Log( LOG_NOTICE, "Client with nick \"%s\" is unknown here.", Req->argv[0] );
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/* Are we still connected or were we killed, too? */
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if(( my_conn > NONE ) && ( Conn_GetClient( my_conn )))
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return CONNECTED;
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else
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return DISCONNECTED;
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} /* IRC_KILL */
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/**
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* Handler for the IRC command NOTICE.
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*/
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GLOBAL bool
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IRC_NOTICE(CLIENT *Client, REQUEST *Req)
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{
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return Send_Message(Client, Req, CLIENT_USER, false);
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} /* IRC_NOTICE */
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/**
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* Handler for the IRC command PRIVMSG.
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*/
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GLOBAL bool
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IRC_PRIVMSG(CLIENT *Client, REQUEST *Req)
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{
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return Send_Message(Client, Req, CLIENT_USER, true);
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} /* IRC_PRIVMSG */
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/**
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* Handler for the IRC command SQUERY.
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*/
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GLOBAL bool
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IRC_SQUERY(CLIENT *Client, REQUEST *Req)
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{
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return Send_Message(Client, Req, CLIENT_SERVICE, true);
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} /* IRC_SQUERY */
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GLOBAL bool
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IRC_TRACE( CLIENT *Client, REQUEST *Req )
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{
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CLIENT *from, *target, *c;
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CONN_ID idx, idx2;
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char user[CLIENT_USER_LEN];
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assert( Client != NULL );
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assert( Req != NULL );
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/* Bad number of arguments? */
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if( Req->argc > 1 ) return IRC_WriteStrClient( Client, ERR_NORECIPIENT_MSG, Client_ID( Client ), Req->command );
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/* Search sender */
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if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
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else from = Client;
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if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
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/* Search target */
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if( Req->argc == 1 ) target = Client_Search( Req->argv[0] );
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else target = Client_ThisServer( );
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/* Forward command to other server? */
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if( target != Client_ThisServer( ))
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{
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if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER )) return IRC_WriteStrClient( from, ERR_NOSUCHSERVER_MSG, Client_ID( from ), Req->argv[0] );
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/* Send RPL_TRACELINK back to initiator */
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idx = Client_Conn( Client ); assert( idx > NONE );
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idx2 = Client_Conn( Client_NextHop( target )); assert( idx2 > NONE );
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if( ! IRC_WriteStrClient( from, RPL_TRACELINK_MSG, Client_ID( from ), PACKAGE_NAME, PACKAGE_VERSION, Client_ID( target ), Client_ID( Client_NextHop( target )), Option_String( idx2 ), time( NULL ) - Conn_StartTime( idx2 ), Conn_SendQ( idx ), Conn_SendQ( idx2 ))) return DISCONNECTED;
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/* Forward command */
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IRC_WriteStrClientPrefix( target, from, "TRACE %s", Req->argv[0] );
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return CONNECTED;
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}
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/* Infos about all connected servers */
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c = Client_First( );
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while( c )
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{
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if( Client_Conn( c ) > NONE )
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{
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/* Local client */
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if( Client_Type( c ) == CLIENT_SERVER )
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{
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/* Server link */
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strlcpy( user, Client_User( c ), sizeof( user ));
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if( user[0] == '~' ) strlcpy( user, "unknown", sizeof( user ));
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if( ! IRC_WriteStrClient( from, RPL_TRACESERVER_MSG, Client_ID( from ), Client_ID( c ), user, Client_Hostname( c ), Client_Mask( Client_ThisServer( )), Option_String( Client_Conn( c )))) return DISCONNECTED;
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}
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if(( Client_Type( c ) == CLIENT_USER ) && ( strchr( Client_Modes( c ), 'o' )))
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{
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/* IRC Operator */
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if( ! IRC_WriteStrClient( from, RPL_TRACEOPERATOR_MSG, Client_ID( from ), Client_ID( c ))) return DISCONNECTED;
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}
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}
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c = Client_Next( c );
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}
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IRC_SetPenalty( Client, 3 );
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return IRC_WriteStrClient( from, RPL_TRACEEND_MSG, Client_ID( from ), Conf_ServerName, PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_DebugLevel );
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} /* IRC_TRACE */
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GLOBAL bool
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IRC_HELP( CLIENT *Client, REQUEST *Req )
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{
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COMMAND *cmd;
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assert( Client != NULL );
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assert( Req != NULL );
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/* Bad number of arguments? */
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if( Req->argc > 0 ) return IRC_WriteStrClient( Client, ERR_NORECIPIENT_MSG, Client_ID( Client ), Req->command );
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cmd = Parse_GetCommandStruct( );
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while( cmd->name )
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{
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if( ! IRC_WriteStrClient( Client, "NOTICE %s :%s", Client_ID( Client ), cmd->name )) return DISCONNECTED;
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cmd++;
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}
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IRC_SetPenalty( Client, 2 );
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return CONNECTED;
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} /* IRC_HELP */
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static char *
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#ifdef ZLIB
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Option_String(CONN_ID Idx)
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#else
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Option_String(UNUSED CONN_ID Idx)
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#endif
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{
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static char option_txt[8];
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#ifdef ZLIB
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UINT16 options;
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options = Conn_Options(Idx);
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#endif
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strcpy(option_txt, "F"); /* No idea what this means, but the
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* original ircd sends it ... */
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#ifdef ZLIB
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if(options & CONN_ZIP) /* zlib compression supported. */
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strcat(option_txt, "z");
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#endif
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return option_txt;
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} /* Option_String */
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static bool
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Send_Message(CLIENT * Client, REQUEST * Req, int ForceType, bool SendErrors)
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{
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CLIENT *cl, *from;
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CL2CHAN *cl2chan;
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CHANNEL *chan;
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char *currentTarget = Req->argv[0];
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char *lastCurrentTarget = NULL;
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assert(Client != NULL);
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assert(Req != NULL);
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if (Req->argc == 0) {
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if (!SendErrors)
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return CONNECTED;
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return IRC_WriteStrClient(Client, ERR_NORECIPIENT_MSG,
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Client_ID(Client), Req->command);
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}
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if (Req->argc == 1) {
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if (!SendErrors)
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return CONNECTED;
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return IRC_WriteStrClient(Client, ERR_NOTEXTTOSEND_MSG,
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Client_ID(Client));
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}
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if (Req->argc > 2) {
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if (!SendErrors)
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return CONNECTED;
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return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
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Client_ID(Client), Req->command);
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}
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if (Client_Type(Client) == CLIENT_SERVER)
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from = Client_Search(Req->prefix);
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else
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from = Client;
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if (!from)
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return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
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Client_ID(Client), Req->prefix);
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/* handle msgtarget = msgto *("," msgto) */
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currentTarget = strtok_r(currentTarget, ",", &lastCurrentTarget);
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ngt_UpperStr(Req->command);
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while (currentTarget) {
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/* Check for and handle valid <msgto> of form:
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* RFC 2812 2.3.1:
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* msgto = channel / ( user [ "%" host ] "@" servername )
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* msgto =/ ( user "%" host ) / targetmask
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* msgto =/ nickname / ( nickname "!" user "@" host )
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*/
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if (strchr(currentTarget, '!') == NULL)
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/* nickname */
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cl = Client_Search(currentTarget);
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else
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cl = NULL;
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if (cl == NULL) {
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/* If currentTarget isn't a nickname check for:
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* user ["%" host] "@" servername
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* user "%" host
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* nickname "!" user "@" host
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*/
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char target[COMMAND_LEN];
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char * nick = NULL;
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char * user = NULL;
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char * host = NULL;
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char * server = NULL;
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strlcpy(target, currentTarget, COMMAND_LEN);
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server = strchr(target, '@');
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if (server) {
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*server = '\0';
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server++;
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}
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host = strchr(target, '%');
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if (host) {
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*host = '\0';
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host++;
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}
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user = strchr(target, '!');
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if (user) {
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/* msgto form: nick!user@host */
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*user = '\0';
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user++;
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nick = target;
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host = server; /* not "@server" but "@host" */
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} else {
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user = target;
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}
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for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
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if (Client_Type(cl) != CLIENT_USER &&
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Client_Type(cl) != CLIENT_SERVICE)
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continue;
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if (nick != NULL && host != NULL) {
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if (strcasecmp(nick, Client_ID(cl)) == 0 &&
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strcasecmp(user, Client_User(cl)) == 0 &&
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strcasecmp(host, Client_HostnameCloaked(cl)) == 0)
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break;
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else
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continue;
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}
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if (strcasecmp(user, Client_User(cl)) != 0)
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continue;
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if (host != NULL && strcasecmp(host,
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Client_HostnameCloaked(cl)) != 0)
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continue;
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if (server != NULL && strcasecmp(server,
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Client_ID(Client_Introducer(cl))) != 0)
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continue;
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break;
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}
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}
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if (cl) {
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/* Target is a user, enforce type */
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#ifndef STRICT_RFC
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if (Client_Type(cl) != ForceType &&
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!(ForceType == CLIENT_USER &&
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(Client_Type(cl) == CLIENT_USER ||
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Client_Type(cl) == CLIENT_SERVICE))) {
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#else
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if (Client_Type(cl) != ForceType) {
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#endif
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if (SendErrors && !IRC_WriteStrClient(
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from, ERR_NOSUCHNICK_MSG,Client_ID(from),
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currentTarget))
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return DISCONNECTED;
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goto send_next_target;
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}
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#ifndef STRICT_RFC
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if (ForceType == CLIENT_SERVICE &&
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(Conn_Options(Client_Conn(Client_NextHop(cl)))
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& CONN_RFC1459)) {
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/* SQUERY command but RFC 1459 link: convert
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* request to PRIVMSG command */
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Req->command = "PRIVMSG";
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}
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#endif
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if (Client_HasMode(cl, 'C')) {
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cl2chan = Channel_FirstChannelOf(cl);
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while (cl2chan) {
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chan = Channel_GetChannel(cl2chan);
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if (Channel_IsMemberOf(chan, from))
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break;
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cl2chan = Channel_NextChannelOf(cl, cl2chan);
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}
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if (!cl2chan) {
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if (SendErrors && !IRC_WriteStrClient(
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from, ERR_NOTONSAMECHANNEL_MSG,
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Client_ID(from), Client_ID(cl)))
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return DISCONNECTED;
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goto send_next_target;
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}
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}
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if (SendErrors && (Client_Type(Client) != CLIENT_SERVER)
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&& strchr(Client_Modes(cl), 'a')) {
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/* Target is away */
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if (!IRC_WriteStrClient(from, RPL_AWAY_MSG,
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Client_ID(from),
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Client_ID(cl),
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Client_Away(cl)))
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return DISCONNECTED;
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}
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if (Client_Conn(from) > NONE) {
|
|
Conn_UpdateIdle(Client_Conn(from));
|
|
}
|
|
if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
|
|
Req->command, Client_ID(cl),
|
|
Req->argv[1]))
|
|
return DISCONNECTED;
|
|
} else if (ForceType != CLIENT_SERVICE
|
|
&& (chan = Channel_Search(currentTarget))) {
|
|
if (!Channel_Write(chan, from, Client, Req->command,
|
|
SendErrors, Req->argv[1]))
|
|
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,
|
|
Req->argv[1], 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- */
|