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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
* Copyright (C) 2008 Dennis Friis <peavey@inspircd.org>
* Copyright (C) 2008 Craig Edwards <craigedwards@brainbox.cc>
*
* 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"
#include "commands.h"
#include "treeserver.h"
#include "treesocket.h"
/** FJOIN, almost identical to TS6 SJOIN, except for nicklist handling. */
CmdResult CommandFJoin::Handle(const std::vector<std::string>& params, User *srcuser)
{
SpanningTreeUtilities* Utils = ((ModuleSpanningTree*)(Module*)creator)->Utils;
/* 1.1+ FJOIN works as follows:
*
* Each FJOIN is sent along with a timestamp, and the side with the lowest
* timestamp 'wins'. From this point on we will refer to this side as the
* winner. The side with the higher timestamp loses, from this point on we
* will call this side the loser or losing side. This should be familiar to
* anyone who's dealt with dreamforge or TS6 before.
*
* When two sides of a split heal and this occurs, the following things
* will happen:
*
* If the timestamps are exactly equal, both sides merge their privilages
* and users, as in InspIRCd 1.0 and ircd2.8. The channels have not been
* re-created during a split, this is safe to do.
*
* If the timestamps are NOT equal, the losing side removes all of its
* modes from the channel, before introducing new users into the channel
* which are listed in the FJOIN command's parameters. The losing side then
* LOWERS its timestamp value of the channel to match that of the winning
* side, and the modes of the users of the winning side are merged in with
* the losing side.
*
* The winning side on the other hand will ignore all user modes from the
* losing side, so only its own modes get applied. Life is simple for those
* who succeed at internets. :-)
*
* Syntax:
* :<sid> FJOIN <chan> <TS> <modes> :[[modes,]<uuid> [[modes,]<uuid> ... ]]
* The last parameter is a list consisting of zero or more (modelist, uuid)
* pairs (permanent channels may have zero users). The mode list for each
* user is a concatenation of the mode letters the user has on the channel
* (e.g.: "ov" if the user is opped and voiced). The order of the mode letters
* are not important but if a server ecounters an unknown mode letter, it will
* drop the link to avoid desync.
*
* InspIRCd 2.0 and older required a comma before the uuid even if the user
* had no prefix modes on the channel, InspIRCd 2.2 and later does not require
* a comma in this case anymore.
*
*/
time_t TS = ConvToInt(params[1]);
if (!TS)
{
ServerInstance->Logs->Log("m_spanningtree", LOG_DEFAULT, "*** BUG? *** TS of 0 sent to FJOIN. Are some services authors smoking craq, or is it 1970 again?. Dropped.");
ServerInstance->SNO->WriteToSnoMask('d', "WARNING: The server %s is sending FJOIN with a TS of zero. Total craq. Command was dropped.", srcuser->server.c_str());
return CMD_INVALID;
}
const std::string& channel = params[0];
Channel* chan = ServerInstance->FindChan(channel);
bool apply_other_sides_modes = true;
if (!chan)
{
chan = new Channel(channel, TS);
}
else
{
time_t ourTS = chan->age;
if (TS != ourTS)
{
ServerInstance->SNO->WriteToSnoMask('d', "Merge FJOIN received for %s, ourTS: %lu, TS: %lu, difference: %lu",
chan->name.c_str(), (unsigned long)ourTS, (unsigned long)TS, (unsigned long)(ourTS - TS));
/* If our TS is less than theirs, we dont accept their modes */
if (ourTS < TS)
{
apply_other_sides_modes = false;
}
else if (ourTS > TS)
{
/* Our TS greater than theirs, clear all our modes from the channel, accept theirs. */
if (Utils->AnnounceTSChange)
chan->WriteChannelWithServ(ServerInstance->Config->ServerName, "NOTICE %s :TS for %s changed from %lu to %lu", chan->name.c_str(), channel.c_str(), (unsigned long) ourTS, (unsigned long) TS);
// while the name is equal in case-insensitive compare, it might differ in case; use the remote version
chan->name = channel;
chan->age = TS;
chan->ClearInvites();
CommandFJoin::RemoveStatus(chan);
// XXX: If the channel does not exist in the chan hash at this point, create it so the remote modes can be applied on it.
// This happens to 0-user permanent channels on the losing side, because those are removed (from the chan hash, then
// deleted later) as soon as the permchan mode is removed from them.
if (ServerInstance->FindChan(channel) == NULL)
{
chan = new Channel(channel, TS);
}
}
}
}
/* First up, apply their channel modes if they won the TS war */
if (apply_other_sides_modes)
{
std::vector<std::string> modelist;
modelist.push_back(channel);
/* Remember, params[params.size() - 1] is userlist, and we don't want to apply *that* */
modelist.insert(modelist.end(), params.begin()+2, params.end()-1);
ServerInstance->SendMode(modelist, srcuser);
}
irc::modestacker modestack(true);
TreeSocket* src_socket = Utils->FindServer(srcuser->server)->GetRoute()->GetSocket();
/* Now, process every 'modes,uuid' pair */
irc::tokenstream users(*params.rbegin());
std::string item;
irc::modestacker* modestackptr = (apply_other_sides_modes ? &modestack : NULL);
while (users.GetToken(item))
{
if (!ProcessModeUUIDPair(item, src_socket, chan, modestackptr))
return CMD_INVALID;
}
/* Flush mode stacker if we lost the FJOIN or had equal TS */
if (apply_other_sides_modes)
CommandFJoin::ApplyModeStack(srcuser, chan, modestack);
return CMD_SUCCESS;
}
bool CommandFJoin::ProcessModeUUIDPair(const std::string& item, TreeSocket* src_socket, Channel* chan, irc::modestacker* modestack)
{
std::string::size_type comma = item.find(',');
// Comma not required anymore if the user has no modes
std::string uuid = ((comma == std::string::npos) ? item : item.substr(comma+1));
User* who = ServerInstance->FindUUID(uuid);
if (!who)
{
// Probably KILLed, ignore
return true;
}
/* Check that the user's 'direction' is correct */
SpanningTreeUtilities* Utils = ((ModuleSpanningTree*)(Module*)creator)->Utils;
TreeServer* route_back_again = Utils->BestRouteTo(who->server);
if ((!route_back_again) || (route_back_again->GetSocket() != src_socket))
{
return true;
}
/* Check if the user received at least one mode */
if ((modestack) && (comma > 0) && (comma != std::string::npos))
{
/* Iterate through the modes and see if they are valid here, if so, apply */
std::string::const_iterator commait = item.begin()+comma;
for (std::string::const_iterator i = item.begin(); i != commait; ++i)
{
if (!ServerInstance->Modes->FindMode(*i, MODETYPE_CHANNEL))
{
ServerInstance->SNO->WriteToSnoMask('d', "Unrecognised mode '%c' for a user in FJOIN, dropping link", *i);
return false;
}
/* Add any modes this user had to the mode stack */
modestack->Push(*i, who->nick);
}
}
chan->ForceJoin(who, NULL, route_back_again->bursting);
return true;
}
void CommandFJoin::RemoveStatus(Channel* c)
{
irc::modestacker stack(false);
for (char modeletter = 'A'; modeletter <= 'z'; ++modeletter)
{
ModeHandler* mh = ServerInstance->Modes->FindMode(modeletter, MODETYPE_CHANNEL);
/* Passing a pointer to a modestacker here causes the mode to be put onto the mode stack,
* rather than applied immediately. Module unloads require this to be done immediately,
* for this function we require tidyness instead. Fixes bug #493
*/
if (mh)
mh->RemoveMode(c, &stack);
}
ApplyModeStack(ServerInstance->FakeClient, c, stack);
}
void CommandFJoin::ApplyModeStack(User* srcuser, Channel* c, irc::modestacker& stack)
{
parameterlist stackresult;
stackresult.push_back(c->name);
while (stack.GetStackedLine(stackresult))
{
ServerInstance->SendMode(stackresult, srcuser);
stackresult.erase(stackresult.begin() + 1, stackresult.end());
}
}
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