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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2013, 2018 Sadie Powell <sadie@witchery.services>
* Copyright (C) 2012-2016 Attila Molnar <attilamolnar@hush.com>
* Copyright (C) 2012, 2019 Robby <robby@chatbelgie.be>
* Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2007-2008 Dennis Friis <peavey@inspircd.org>
* Copyright (C) 2006, 2010 Craig Edwards <brain@inspircd.org>
* Copyright (C) 2006 Oliver Lupton <om@inspircd.org>
*
* This file is part of InspIRCd. InspIRCd 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, version 2.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "inspircd.h"
enum BlockAction { IBLOCK_KILL, IBLOCK_KILLOPERS, IBLOCK_NOTICE, IBLOCK_NOTICEOPERS, IBLOCK_SILENT };
/* IBLOCK_NOTICE - Send a notice to the user informing them of what happened.
* IBLOCK_NOTICEOPERS - Send a notice to the user informing them and send an oper notice.
* IBLOCK_SILENT - Generate no output, silently drop messages.
* IBLOCK_KILL - Kill the user with the reason "Global message (/amsg or /ame) detected".
* IBLOCK_KILLOPERS - As above, but send an oper notice as well. This is the default.
*/
/** Holds a blocked message's details
*/
class BlockedMessage
{
public:
std::string message;
std::string target;
time_t sent;
BlockedMessage(const std::string& msg, const std::string& tgt, time_t when)
: message(msg), target(tgt), sent(when)
{
}
};
class ModuleBlockAmsg : public Module
{
unsigned int ForgetDelay;
BlockAction action;
SimpleExtItem<BlockedMessage> blockamsg;
public:
ModuleBlockAmsg()
: blockamsg("blockamsg", ExtensionItem::EXT_USER, this)
{
}
Version GetVersion() CXX11_OVERRIDE
{
return Version("Blocks mass messages sent using the /AME and /AMSG commands that exist in clients such as mIRC and HexChat.", VF_VENDOR);
}
void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
{
ConfigTag* tag = ServerInstance->Config->ConfValue("blockamsg");
ForgetDelay = tag->getDuration("delay", 3);
std::string act = tag->getString("action");
if (stdalgo::string::equalsci(act, "notice"))
action = IBLOCK_NOTICE;
else if (stdalgo::string::equalsci(act, "noticeopers"))
action = IBLOCK_NOTICEOPERS;
else if (stdalgo::string::equalsci(act, "silent"))
action = IBLOCK_SILENT;
else if (stdalgo::string::equalsci(act, "kill"))
action = IBLOCK_KILL;
else
action = IBLOCK_KILLOPERS;
}
ModResult OnPreCommand(std::string& command, CommandBase::Params& parameters, LocalUser* user, bool validated) CXX11_OVERRIDE
{
// Don't do anything with unregistered users
if (user->registered != REG_ALL)
return MOD_RES_PASSTHRU;
if ((validated) && (parameters.size() >= 2) && ((command == "PRIVMSG") || (command == "NOTICE")))
{
// parameters[0] is the target list, count how many channels are there
unsigned int targets = 0;
// Is the first target a channel?
if (*parameters[0].c_str() == '#')
targets = 1;
for (const char* c = parameters[0].c_str(); *c; c++)
{
if ((*c == ',') && (*(c+1) == '#'))
targets++;
}
/* targets should now contain the number of channel targets the msg/notice was pointed at.
* If the msg/notice was a PM there should be no channel targets and 'targets' should = 0.
* We don't want to block PMs so...
*/
if (targets == 0)
return MOD_RES_PASSTHRU;
// Check that this message wasn't already sent within a few seconds.
BlockedMessage* m = blockamsg.get(user);
// If the message is identical and within the time.
// We check the target is *not* identical, that'd straying into the realms of flood control. Which isn't what we're doing...
// OR
// The number of target channels is equal to the number of channels the sender is on..a little suspicious.
// Check it's more than 1 too, or else users on one channel would have fun.
if ((m && (m->message == parameters[1]) && (!irc::equals(m->target, parameters[0])) && ForgetDelay && (m->sent >= ServerInstance->Time()-ForgetDelay)) || ((targets > 1) && (targets == user->chans.size())))
{
// Block it...
if (action == IBLOCK_KILLOPERS || action == IBLOCK_NOTICEOPERS)
ServerInstance->SNO->WriteToSnoMask('a', "%s had an /amsg or /ame blocked", user->nick.c_str());
if (action == IBLOCK_KILL || action == IBLOCK_KILLOPERS)
ServerInstance->Users->QuitUser(user, "Attempted to global message (/amsg or /ame)");
else if (action == IBLOCK_NOTICE || action == IBLOCK_NOTICEOPERS)
user->WriteNotice("Global message (/amsg or /ame) blocked");
return MOD_RES_DENY;
}
if (m)
{
// If there's already a BlockedMessage allocated, use it.
m->message = parameters[1];
m->target = parameters[0];
m->sent = ServerInstance->Time();
}
else
{
m = new BlockedMessage(parameters[1], parameters[0], ServerInstance->Time());
blockamsg.set(user, m);
}
}
return MOD_RES_PASSTHRU;
}
};
MODULE_INIT(ModuleBlockAmsg)
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