/*
* 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. :-)
*/
if (params.size() < 3)
return CMD_INVALID;
irc::modestacker modestack(true); /* Modes to apply from the users in the user list */
User* who = NULL; /* User we are currently checking */
std::string channel = params[0]; /* Channel name, as a string */
time_t TS = atoi(params[1].c_str()); /* Timestamp given to us for remote side */
irc::tokenstream users((params.size() > 3) ? params[params.size() - 1] : ""); /* users from the user list */
bool apply_other_sides_modes = true; /* True if we are accepting the other side's modes */
Channel* chan = ServerInstance->FindChan(channel); /* The channel we're sending joins to */
bool created = !chan; /* True if the channel doesnt exist here yet */
std::string item; /* One item in the list of nicks */
TreeSocket* src_socket = Utils->FindServer(srcuser->server)->GetRoute()->GetSocket();
if (!TS)
{
ServerInstance->Logs->Log("m_spanningtree",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;
}
if (created)
{
chan = new Channel(channel, TS);
ServerInstance->SNO->WriteToSnoMask('d', "Creation FJOIN received for %s, timestamp: %lu", chan->name.c_str(), (unsigned long)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)
{
ServerInstance->SNO->WriteToSnoMask('d', "NOT Applying modes from other side");
apply_other_sides_modes = false;
}
else if (ourTS > TS)
{
/* Our TS greater than theirs, clear all our modes from the channel, accept theirs. */
ServerInstance->SNO->WriteToSnoMask('d', "Removing our modes, accepting remote");
parameterlist param_list;
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();
param_list.push_back(channel);
this->RemoveStatus(ServerInstance->FakeClient, param_list);
}
// The silent case here is ourTS == TS, we don't need to remove modes here, just to merge them later on.
}
/* First up, apply their modes if they won the TS war */
if (apply_other_sides_modes)
{
unsigned int idx = 2;
std::vector<std::string> modelist;
// Mode parser needs to know what channel to act on.
modelist.push_back(params[0]);
/* Remember, params[params.size() - 1] is nicklist, and we don't want to apply *that* */
for (idx = 2; idx != (params.size() - 1); idx++)
{
modelist.push_back(params[idx]);
}
ServerInstance->SendMode(modelist, srcuser);
}
/* Now, process every 'modes,nick' pair */
while (users.GetToken(item))
{
const char* usr = item.c_str();
if (usr && *usr)
{
const char* unparsedmodes = usr;
std::string modes;
/* Iterate through all modes for this user and check they are valid. */
while ((*unparsedmodes) && (*unparsedmodes != ','))
{
ModeHandler *mh = ServerInstance->Modes->FindMode(*unparsedmodes, MODETYPE_CHANNEL);
if (!mh)
{
ServerInstance->Logs->Log("m_spanningtree", SPARSE, "Unrecognised mode %c, dropping link", *unparsedmodes);
return CMD_INVALID;
}
modes += *unparsedmodes;
usr++;
unparsedmodes++;
}
/* Advance past the comma, to the nick */
usr++;
/* Check the user actually exists */
who = ServerInstance->FindUUID(usr);
if (who)
{
/* Check that the user's 'direction' is correct */
TreeServer* route_back_again = Utils->BestRouteTo(who->server);
if ((!route_back_again) || (route_back_again->GetSocket() != src_socket))
continue;
/* Add any modes this user had to the mode stack */
for (std::string::iterator x = modes.begin(); x != modes.end(); ++x)
modestack.Push(*x, who->nick);
Channel::JoinUser(who, channel.c_str(), true, "", route_back_again->bursting, TS);
}
else
{
ServerInstance->Logs->Log("m_spanningtree",SPARSE, "Ignored nonexistant user %s in fjoin to %s (probably quit?)", usr, channel.c_str());
continue;
}
}
}
/* Flush mode stacker if we lost the FJOIN or had equal TS */
if (apply_other_sides_modes)
{
parameterlist stackresult;
stackresult.push_back(channel);
while (modestack.GetStackedLine(stackresult))
{
ServerInstance->SendMode(stackresult, srcuser);
stackresult.erase(stackresult.begin() + 1, stackresult.end());
}
}
return CMD_SUCCESS;
}
void CommandFJoin::RemoveStatus(User* srcuser, parameterlist ¶ms)
{
if (params.size() < 1)
return;
Channel* c = ServerInstance->FindChan(params[0]);
if (c)
{
irc::modestacker stack(false);
parameterlist stackresult;
stackresult.push_back(c->name);
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);
}
while (stack.GetStackedLine(stackresult))
{
ServerInstance->SendMode(stackresult, srcuser);
stackresult.erase(stackresult.begin() + 1, stackresult.end());
}
}
}
