void OnBackgroundTimer(time_t curtime) override
{
timedbans expired;
for (timedbans::iterator i = TimedBanList.begin(); i != TimedBanList.end();)
{
if (curtime > i->expire)
{
expired.push_back(*i);
i = TimedBanList.erase(i);
}
else
++i;
}
for (timedbans::iterator i = expired.begin(); i != expired.end(); i++)
{
std::string mask = i->mask;
Channel* cr = i->chan;
{
const std::string expiry = "*** Timed ban on " + cr->name + " expired.";
// If halfop is loaded, send notice to halfops and above, otherwise send to ops and above
PrefixMode* mh = ServerInstance->Modes.FindPrefixMode('h');
char pfxchar = (mh && mh->name == "halfop") ? mh->GetPrefix() : '@';
ClientProtocol::Messages::Privmsg notice(ClientProtocol::Messages::Privmsg::nocopy, ServerInstance->FakeClient, cr, expiry, MSG_NOTICE);
cr->Write(ServerInstance->GetRFCEvents().privmsg, notice, pfxchar);
ServerInstance->PI->SendChannelNotice(cr, pfxchar, expiry);
Modes::ChangeList setban;
setban.push_remove(ServerInstance->Modes.FindMode('b', MODETYPE_CHANNEL), mask);
ServerInstance->Modes.Process(ServerInstance->FakeClient, cr, NULL, setban);
}
}
}
void DataKeeper::DoRestoreChans()
{
ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Restoring channel data");
Modes::ChangeList modechange;
for (std::vector<ChanData>::const_iterator i = chandatalist.begin(); i != chandatalist.end(); ++i)
{
const ChanData& chandata = *i;
Channel* const chan = ServerInstance->FindChan(chandata.owner);
if (!chan)
{
ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Channel %s not found", chandata.owner.c_str());
continue;
}
RestoreObj(chandata, chan, MODETYPE_CHANNEL, modechange);
// Process the mode change before applying any prefix modes
ServerInstance->Modes.Process(ServerInstance->FakeClient, chan, NULL, modechange, ModeParser::MODE_LOCALONLY);
modechange.clear();
// Restore all member data
RestoreMemberData(chan, chandata.memberdatalist, modechange);
ServerInstance->Modes.Process(ServerInstance->FakeClient, chan, NULL, modechange, ModeParser::MODE_LOCALONLY);
modechange.clear();
}
}
void ModuleSpanningTree::OnMode(User* source, User* u, Channel* c, const Modes::ChangeList& modes, ModeParser::ModeProcessFlag processflags)
{
if (processflags & ModeParser::MODE_LOCALONLY)
return;
if (u)
{
if (u->registered != REG_ALL)
return;
CmdBuilder params(source, "MODE");
params.push(u->uuid);
params.push(ClientProtocol::Messages::Mode::ToModeLetters(modes));
params.push_raw(Translate::ModeChangeListToParams(modes.getlist()));
params.Broadcast();
}
else
{
CmdBuilder params(source, "FMODE");
params.push(c->name);
params.push_int(c->age);
params.push(ClientProtocol::Messages::Mode::ToModeLetters(modes));
params.push_raw(Translate::ModeChangeListToParams(modes.getlist()));
params.Broadcast();
}
}
void SetOperPrefix(User* user, bool add)
{
Modes::ChangeList changelist;
changelist.push(&opm, add, user->nick);
for (User::ChanList::iterator v = user->chans.begin(); v != user->chans.end(); v++)
ServerInstance->Modes->Process(ServerInstance->FakeClient, (*v)->chan, NULL, changelist);
}
void User::UnOper()
{
if (!this->IsOper())
return;
/*
* unset their oper type (what IS_OPER checks).
* note, order is important - this must come before modes as -o attempts
* to call UnOper. -- w00t
*/
oper = NULL;
/* Remove all oper only modes from the user when the deoper - Bug #466*/
Modes::ChangeList changelist;
const ModeParser::ModeHandlerMap& usermodes = ServerInstance->Modes->GetModes(MODETYPE_USER);
for (ModeParser::ModeHandlerMap::const_iterator i = usermodes.begin(); i != usermodes.end(); ++i)
{
ModeHandler* mh = i->second;
if (mh->NeedsOper())
changelist.push_remove(mh);
}
ServerInstance->Modes->Process(this, NULL, this, changelist);
// Remove the user from the oper list
stdalgo::vector::swaperase(ServerInstance->Users->all_opers, this);
ModeHandler* opermh = ServerInstance->Modes->FindMode('o', MODETYPE_USER);
this->SetMode(opermh, false);
}
CmdResult Handle(User* user, const Params& parameters) override
{
Channel* channel = ServerInstance->FindChan(parameters[0]);
if (!channel)
{
user->WriteNumeric(Numerics::NoSuchChannel(parameters[0]));
return CMD_FAILURE;
}
unsigned int cm = channel->GetPrefixValue(user);
if (cm < HALFOP_VALUE)
{
user->WriteNumeric(ERR_CHANOPRIVSNEEDED, channel->name, "You do not have permission to set bans on this channel");
return CMD_FAILURE;
}
TimedBan T;
unsigned long duration;
if (!InspIRCd::Duration(parameters[1], duration))
{
user->WriteNotice("Invalid ban time");
return CMD_FAILURE;
}
unsigned long expire = duration + ServerInstance->Time();
std::string mask = parameters[2];
bool isextban = ((mask.size() > 2) && (mask[1] == ':'));
if (!isextban && !InspIRCd::IsValidMask(mask))
mask.append("!*@*");
if (IsBanSet(channel, mask))
{
user->WriteNotice("Ban already set");
return CMD_FAILURE;
}
Modes::ChangeList setban;
setban.push_add(ServerInstance->Modes.FindMode('b', MODETYPE_CHANNEL), mask);
// Pass the user (instead of ServerInstance->FakeClient) to ModeHandler::Process() to
// make it so that the user sets the mode themselves
ServerInstance->Modes.Process(user, channel, NULL, setban);
if (ServerInstance->Modes.GetLastChangeList().empty())
{
user->WriteNotice("Invalid ban mask");
return CMD_FAILURE;
}
T.mask = mask;
T.expire = expire + (IS_REMOTE(user) ? 5 : 0);
T.chan = channel;
TimedBanList.push_back(T);
const std::string addban = user->nick + " added a timed ban on " + mask + " lasting for " + InspIRCd::DurationString(duration) + ".";
// If halfop is loaded, send notice to halfops and above, otherwise send to ops and above
PrefixMode* mh = ServerInstance->Modes.FindPrefixMode('h');
char pfxchar = (mh && mh->name == "halfop") ? mh->GetPrefix() : '@';
ClientProtocol::Messages::Privmsg notice(ServerInstance->FakeClient, channel, addban, MSG_NOTICE);
channel->Write(ServerInstance->GetRFCEvents().privmsg, notice, pfxchar);
ServerInstance->PI->SendChannelNotice(channel, pfxchar, addban);
return CMD_SUCCESS;
}
CmdResult Handle (const std::vector<std::string> ¶meters, User *user)
{
Channel* channel = ServerInstance->FindChan(parameters[0]);
if (!channel)
{
user->WriteNumeric(Numerics::NoSuchNick(parameters[0]));
return CMD_FAILURE;
}
int cm = channel->GetPrefixValue(user);
if (cm < HALFOP_VALUE)
{
user->WriteNumeric(ERR_CHANOPRIVSNEEDED, channel->name, "You do not have permission to set bans on this channel");
return CMD_FAILURE;
}
TimedBan T;
unsigned long duration = InspIRCd::Duration(parameters[1]);
unsigned long expire = duration + ServerInstance->Time();
if (duration < 1)
{
user->WriteNotice("Invalid ban time");
return CMD_FAILURE;
}
std::string mask = parameters[2];
bool isextban = ((mask.size() > 2) && (mask[1] == ':'));
if (!isextban && !InspIRCd::IsValidMask(mask))
mask.append("!*@*");
if (IsBanSet(channel, mask))
{
user->WriteNotice("Ban already set");
return CMD_FAILURE;
}
Modes::ChangeList setban;
setban.push_add(ServerInstance->Modes->FindMode('b', MODETYPE_CHANNEL), mask);
// Pass the user (instead of ServerInstance->FakeClient) to ModeHandler::Process() to
// make it so that the user sets the mode themselves
ServerInstance->Modes->Process(user, channel, NULL, setban);
if (ServerInstance->Modes->GetLastParse().empty())
{
user->WriteNotice("Invalid ban mask");
return CMD_FAILURE;
}
CUList tmp;
T.mask = mask;
T.expire = expire + (IS_REMOTE(user) ? 5 : 0);
T.chan = channel;
TimedBanList.push_back(T);
// If halfop is loaded, send notice to halfops and above, otherwise send to ops and above
ModeHandler* mh = ServerInstance->Modes->FindMode('h', MODETYPE_CHANNEL);
char pfxchar = (mh && mh->name == "halfop") ? '%' : '@';
channel->WriteAllExcept(ServerInstance->FakeClient, true, pfxchar, tmp, "NOTICE %s :%s added a timed ban on %s lasting for %ld seconds.", channel->name.c_str(), user->nick.c_str(), mask.c_str(), duration);
return CMD_SUCCESS;
}
void ModeHandler::RemoveMode(User* user)
{
// Remove the mode if it's set on the user
if (user->IsModeSet(this->GetModeChar()))
{
Modes::ChangeList changelist;
changelist.push_remove(this);
ServerInstance->Modes->Process(ServerInstance->FakeClient, NULL, user, changelist, ModeParser::MODE_LOCALONLY);
}
}
void ModeHandler::RemoveMode(Channel* channel, Modes::ChangeList& changelist)
{
if (channel->IsModeSet(this))
{
if (this->GetNumParams(false))
// Removing this mode requires a parameter
changelist.push_remove(this, channel->GetModeParameter(this));
else
changelist.push_remove(this);
}
}
void OnPostJoin(Membership* memb)
{
if ((!IS_LOCAL(memb->user)) || (!memb->user->IsOper()) || (memb->user->IsModeSet(hideopermode)))
return;
if (memb->HasMode(&opm))
return;
// The user was force joined and OnUserPreJoin() did not run. Set the operprefix now.
Modes::ChangeList changelist;
changelist.push_add(&opm, memb->user->nick);
ServerInstance->Modes.Process(ServerInstance->FakeClient, memb->chan, NULL, changelist);
}
void ModeParser::ModeParamsToChangeList(User* user, ModeType type, const std::vector<std::string>& parameters, Modes::ChangeList& changelist, unsigned int beginindex, unsigned int endindex)
{
if (endindex > parameters.size())
endindex = parameters.size();
const std::string& mode_sequence = parameters[beginindex];
bool adding = true;
unsigned int param_at = beginindex+1;
for (std::string::const_iterator letter = mode_sequence.begin(); letter != mode_sequence.end(); letter++)
{
unsigned char modechar = *letter;
if (modechar == '+' || modechar == '-')
{
adding = (modechar == '+');
continue;
}
ModeHandler *mh = this->FindMode(modechar, type);
if (!mh)
{
/* No mode handler? Unknown mode character then. */
user->WriteNumeric(type == MODETYPE_CHANNEL ? ERR_UNKNOWNMODE : ERR_UNKNOWNSNOMASK, "%c :is unknown mode char to me", modechar);
continue;
}
std::string parameter;
if (mh->GetNumParams(adding) && param_at < endindex)
parameter = parameters[param_at++];
changelist.push(mh, adding, parameter);
}
}
void DataKeeper::RestoreModes(const std::vector<InstanceData>& list, ModeType modetype, Modes::ChangeList& modechange)
{
for (std::vector<InstanceData>::const_iterator i = list.begin(); i != list.end(); ++i)
{
const InstanceData& id = *i;
modechange.push_add(handledmodes[modetype][id.index].mh, id.serialized);
}
}
void PrefixMode::RemoveMode(Channel* chan, Modes::ChangeList& changelist)
{
const Channel::MemberMap& userlist = chan->GetUsers();
for (Channel::MemberMap::const_iterator i = userlist.begin(); i != userlist.end(); ++i)
{
if (i->second->hasMode(this->GetModeChar()))
changelist.push_remove(this, i->first->nick);
}
}
void DataKeeper::DoRestoreUsers()
{
ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Restoring user data");
Modes::ChangeList modechange;
for (std::vector<UserData>::const_iterator i = userdatalist.begin(); i != userdatalist.end(); ++i)
{
const UserData& userdata = *i;
User* const user = ServerInstance->FindUUID(userdata.owner);
if (!user)
{
ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "User %s is gone", userdata.owner.c_str());
continue;
}
RestoreObj(userdata, user, MODETYPE_USER, modechange);
ServerInstance->Modes.Process(ServerInstance->FakeClient, NULL, user, modechange, ModeParser::MODE_LOCALONLY);
modechange.clear();
}
}
CmdResult HandleLocal(const std::vector<std::string>& parameters, LocalUser* user)
{
// Make sure the channel name is allowable.
if (!ServerInstance->IsChannel(parameters[0]))
{
user->WriteNotice("*** Invalid characters in channel name or name too long");
return CMD_FAILURE;
}
active = true;
// override is false because we want OnUserPreJoin to run
Channel* channel = Channel::JoinUser(user, parameters[0], false);
active = false;
if (channel)
{
ServerInstance->SNO->WriteGlobalSno('a', user->nick+" used OJOIN to join "+channel->name);
if (notice)
{
channel->WriteChannelWithServ(ServerInstance->Config->ServerName, "NOTICE %s :%s joined on official network business.",
parameters[0].c_str(), user->nick.c_str());
ServerInstance->PI->SendChannelNotice(channel, 0, user->nick + " joined on official network business.");
}
}
else
{
channel = ServerInstance->FindChan(parameters[0]);
if (!channel)
return CMD_FAILURE;
ServerInstance->SNO->WriteGlobalSno('a', user->nick+" used OJOIN in "+parameters[0]);
// they're already in the channel
Modes::ChangeList changelist;
changelist.push_add(npmh, user->nick);
if (op)
changelist.push_add(ServerInstance->Modes->FindMode('o', MODETYPE_CHANNEL), user->nick);
ServerInstance->Modes->Process(ServerInstance->FakeClient, channel, NULL, changelist);
}
return CMD_SUCCESS;
}
void ModeParser::Process(User* user, Channel* targetchannel, User* targetuser, Modes::ChangeList& changelist, ModeProcessFlag flags)
{
// Call ProcessSingle until the entire list is processed, but at least once to ensure
// LastParse and LastChangeList are cleared
unsigned int processed = 0;
do
{
unsigned int n = ProcessSingle(user, targetchannel, targetuser, changelist, flags, processed);
processed += n;
}
while (processed < changelist.size());
}
CmdResult HandleLocal(const std::vector<std::string>& parameters, LocalUser* src)
{
Channel* const chan = ServerInstance->FindChan(parameters[0]);
if (!chan)
{
src->WriteNumeric(Numerics::NoSuchNick(parameters[0]));
return CMD_FAILURE;
}
if (parameters.size() == 1)
{
DisplayList(src, chan);
return CMD_SUCCESS;
}
unsigned int i = 1;
Modes::ChangeList modes;
while (i < parameters.size())
{
std::string prop = parameters[i++];
if (prop.empty())
continue;
bool plus = prop[0] != '-';
if (prop[0] == '+' || prop[0] == '-')
prop.erase(prop.begin());
ModeHandler* mh = ServerInstance->Modes->FindMode(prop, MODETYPE_CHANNEL);
if (mh)
{
if (mh->NeedsParam(plus))
{
if (i != parameters.size())
modes.push(mh, plus, parameters[i++]);
}
else
modes.push(mh, plus);
}
}
ServerInstance->Modes->ProcessSingle(src, chan, NULL, modes, ModeParser::MODE_CHECKACCESS);
return CMD_SUCCESS;
}
ModResult OnUserPreMessage(User* user, const MessageTarget& target, MessageDetails& details) override
{
if (target.type != MessageTarget::TYPE_CHANNEL || !IS_LOCAL(user))
return MOD_RES_PASSTHRU;
Channel* chan = target.Get<Channel>();
ChannelSettings* settings = rm.ext.get(chan);
if (!settings)
return MOD_RES_PASSTHRU;
Membership* memb = chan->GetUser(user);
if (!memb)
return MOD_RES_PASSTHRU;
ModResult res = CheckExemption::Call(exemptionprov, user, chan, "repeat");
if (res == MOD_RES_ALLOW)
return MOD_RES_PASSTHRU;
if (rm.MatchLine(memb, settings, details.text))
{
if (settings->Action == ChannelSettings::ACT_BLOCK)
{
user->WriteNotice("*** This line is too similar to one of your last lines.");
return MOD_RES_DENY;
}
if (settings->Action == ChannelSettings::ACT_BAN)
{
Modes::ChangeList changelist;
changelist.push_add(ServerInstance->Modes.FindMode('b', MODETYPE_CHANNEL), "*!*@" + user->GetDisplayedHost());
ServerInstance->Modes.Process(ServerInstance->FakeClient, chan, NULL, changelist);
}
memb->chan->KickUser(ServerInstance->FakeClient, user, "Repeat flood");
return MOD_RES_DENY;
}
return MOD_RES_PASSTHRU;
}
void DataKeeper::DoRestoreUsers()
{
ServerInstance->Logs.Log(MODNAME, LOG_DEBUG, "Restoring user data");
Modes::ChangeList modechange;
for (std::vector<UserData>::const_iterator i = userdatalist.begin(); i != userdatalist.end(); ++i)
{
const UserData& userdata = *i;
User* const user = ServerInstance->FindUUID(userdata.owner);
if (!user)
{
ServerInstance->Logs.Log(MODNAME, LOG_DEBUG, "User %s is gone", userdata.owner.c_str());
continue;
}
// Attempt to restore serializer first, if it fails it's a fatal error and RestoreSerializer() quits them
if (!RestoreSerializer(userdata.serializerindex, user))
continue;
RestoreObj(userdata, user, MODETYPE_USER, modechange);
ServerInstance->Modes.Process(ServerInstance->FakeClient, NULL, user, modechange, ModeParser::MODE_LOCALONLY);
modechange.clear();
}
}
void ValidateChans()
{
Modes::ChangeList removepermchan;
badchan = true;
const chan_hash& chans = ServerInstance->GetChans();
for (chan_hash::const_iterator i = chans.begin(); i != chans.end(); )
{
Channel* c = i->second;
// Move iterator before we begin kicking
++i;
if (ServerInstance->IsChannel(c->name))
continue; // The name of this channel is still valid
if (c->IsModeSet(permchannelmode) && c->GetUserCounter())
{
removepermchan.clear();
removepermchan.push_remove(*permchannelmode);
ServerInstance->Modes.Process(ServerInstance->FakeClient, c, NULL, removepermchan);
}
Channel::MemberMap& users = c->userlist;
for (Channel::MemberMap::iterator j = users.begin(); j != users.end(); )
{
if (IS_LOCAL(j->first))
{
// KickUser invalidates the iterator
Channel::MemberMap::iterator it = j++;
c->KickUser(ServerInstance->FakeClient, it, "Channel name no longer valid");
}
else
++j;
}
}
badchan = false;
}
CmdResult Handle(User* user, const Params& parameters) override
{
ModeHandler* mh;
Channel* chan = ServerInstance->FindChan(parameters[0]);
char modeletter = parameters[1][0];
if (chan == NULL)
{
user->WriteNotice("The channel " + parameters[0] + " does not exist.");
return CMD_FAILURE;
}
mh = ServerInstance->Modes.FindMode(modeletter, MODETYPE_CHANNEL);
if (mh == NULL || parameters[1].size() > 1)
{
user->WriteNotice(parameters[1] + " is not a valid channel mode.");
return CMD_FAILURE;
}
if (chan->GetPrefixValue(user) < mh->GetLevelRequired(false))
{
user->WriteNotice("You do not have access to unset " + ConvToStr(modeletter) + " on " + chan->name + ".");
return CMD_FAILURE;
}
std::string pattern = parameters.size() > 2 ? parameters[2] : "*";
PrefixMode* pm;
ListModeBase* lm;
ListModeBase::ModeList* ml;
Modes::ChangeList changelist;
if ((pm = mh->IsPrefixMode()))
{
// As user prefix modes don't have a GetList() method, let's iterate through the channel's users.
const Channel::MemberMap& users = chan->GetUsers();
for (Channel::MemberMap::const_iterator it = users.begin(); it != users.end(); ++it)
{
if (!InspIRCd::Match(it->first->nick, pattern))
continue;
if (it->second->HasMode(pm) && !((it->first == user) && (pm->GetPrefixRank() > VOICE_VALUE)))
changelist.push_remove(mh, it->first->nick);
}
}
else if ((lm = mh->IsListModeBase()) && ((ml = lm->GetList(chan)) != NULL))
{
for (ListModeBase::ModeList::iterator it = ml->begin(); it != ml->end(); ++it)
{
if (!InspIRCd::Match(it->mask, pattern))
continue;
changelist.push_remove(mh, it->mask);
}
}
else
{
if (chan->IsModeSet(mh))
changelist.push_remove(mh);
}
ServerInstance->Modes.Process(user, chan, NULL, changelist);
return CMD_SUCCESS;
}
unsigned int ModeParser::ProcessSingle(User* user, Channel* targetchannel, User* targetuser, Modes::ChangeList& changelist, ModeProcessFlag flags, unsigned int beginindex)
{
LastParse.clear();
LastChangeList.clear();
unsigned int modes_processed = 0;
std::string output_mode;
std::string output_parameters;
char output_pm = '\0'; // current output state, '+' or '-'
Modes::ChangeList::List& list = changelist.getlist();
for (Modes::ChangeList::List::iterator i = list.begin()+beginindex; i != list.end(); ++i)
{
modes_processed++;
Modes::Change& item = *i;
ModeHandler* mh = item.mh;
// If the mode is supposed to have a parameter then we first take a look at item.param
// and, if we were asked to, also handle mode merges now
if (mh->GetNumParams(item.adding))
{
// Skip the mode if the parameter does not pass basic validation
if (!IsModeParamValid(user, targetchannel, targetuser, item))
continue;
// If this is a merge and we won we don't apply this mode
if ((flags & MODE_MERGE) && (!ShouldApplyMergedMode(targetchannel, item)))
continue;
}
ModeAction ma = TryMode(user, targetuser, targetchannel, item, (!(flags & MODE_CHECKACCESS)));
if (ma != MODEACTION_ALLOW)
continue;
char needed_pm = item.adding ? '+' : '-';
if (needed_pm != output_pm)
{
output_pm = needed_pm;
output_mode.append(1, output_pm);
}
output_mode.push_back(mh->GetModeChar());
if (!item.param.empty())
{
output_parameters.push_back(' ');
output_parameters.append(item.param);
}
LastChangeList.push(mh, item.adding, item.param);
if ((output_mode.length() + output_parameters.length() > 450)
|| (output_mode.length() > 100)
|| (LastChangeList.size() >= ServerInstance->Config->Limits.MaxModes))
{
/* mode sequence is getting too long */
break;
}
}
if (!output_mode.empty())
{
LastParse = targetchannel ? targetchannel->name : targetuser->nick;
LastParse.append(" ");
LastParse.append(output_mode);
LastParse.append(output_parameters);
if (targetchannel)
targetchannel->WriteChannel(user, "MODE " + LastParse);
else
targetuser->WriteFrom(user, "MODE " + LastParse);
FOREACH_MOD(OnMode, (user, targetuser, targetchannel, LastChangeList, flags, output_mode));
}
return modes_processed;
}
/** FJOIN, almost identical to TS6 SJOIN, except for nicklist handling. */
CmdResult CommandFJoin::Handle(User* srcuser, Params& params)
{
/* 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. :-)
*
* Outside of netbursts, the winning side also resyncs the losing side if it
* detects that the other side recreated the channel.
*
* Syntax:
* :<sid> FJOIN <chan> <TS> <modes> :[<member> [<member> ...]]
* The last parameter is a list consisting of zero or more channel members
* (permanent channels may have zero users). Each entry on the list is in the
* following format:
* [[<modes>,]<uuid>[:<membid>]
* <modes> 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 3.0 and later does not require
* a comma in this case anymore.
*
* <membid> is a positive integer representing the id of the membership.
* If not present (in FJOINs coming from pre-1205 servers), 0 is assumed.
*
* Forwarding:
* FJOIN messages are forwarded with the new TS and modes. Prefix modes of
* members on the losing side are not forwarded.
* This is required to only have one server on each side of the network who
* decides the fate of a channel during a network merge. Otherwise, if the
* clock of a server is slightly off it may make a different decision than
* the rest of the network and desync.
* The prefix modes are always forwarded as-is, or not at all.
* One incoming FJOIN may result in more than one FJOIN being generated
* and forwarded mainly due to compatibility reasons with non-InspIRCd
* servers that don't handle more than 512 char long lines.
*
* Forwarding examples:
* Existing channel #chan with TS 1000, modes +n.
* Incoming: :220 FJOIN #chan 1000 +t :o,220AAAAAB:0
* Forwarded: :220 FJOIN #chan 1000 +nt :o,220AAAAAB:0
* Merge modes and forward the result. Forward their prefix modes as well.
*
* Existing channel #chan with TS 1000, modes +nt.
* Incoming: :220 FJOIN #CHAN 2000 +i :ov,220AAAAAB:0 o,220AAAAAC:20
* Forwarded: :220 FJOIN #chan 1000 +nt :,220AAAAAB:0 ,220AAAAAC:20
* Drop their modes, forward our modes and TS, use our channel name
* capitalization. Don't forward prefix modes.
*
*/
time_t TS = ServerCommand::ExtractTS(params[1]);
const std::string& channel = params[0];
Channel* chan = ServerInstance->FindChan(channel);
bool apply_other_sides_modes = true;
TreeServer* const sourceserver = TreeServer::Get(srcuser);
if (!chan)
{
chan = new Channel(channel, TS);
}
else
{
time_t ourTS = chan->age;
if (TS != ourTS)
{
ServerInstance->Logs.Log(MODNAME, LOG_DEBUG, "Merge FJOIN received for %s, ourTS: %lu, TS: %lu, difference: %ld",
chan->name.c_str(), (unsigned long)ourTS, (unsigned long)TS, (long)(ourTS - TS));
/* If our TS is less than theirs, we dont accept their modes */
if (ourTS < TS)
{
// If the source server isn't bursting then this FJOIN is the result of them recreating the channel with a higher TS.
// This happens if the last user on the channel hops and before the PART propagates a user on another server joins. Fix it by doing a resync.
// Servers behind us won't react this way because the forwarded FJOIN will have the correct TS.
if (!sourceserver->IsBursting())
{
ServerInstance->Logs.Log(MODNAME, LOG_DEBUG, "Server %s recreated channel %s with higher TS, resyncing", sourceserver->GetName().c_str(), chan->name.c_str());
sourceserver->GetSocket()->SyncChannel(chan);
}
apply_other_sides_modes = false;
}
else if (ourTS > TS)
{
// Our TS is greater than theirs, remove all modes, extensions, etc. from the channel
LowerTS(chan, TS, channel);
// 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);
}
}
}
}
// Apply their channel modes if we have to
Modes::ChangeList modechangelist;
if (apply_other_sides_modes)
{
ServerInstance->Modes.ModeParamsToChangeList(srcuser, MODETYPE_CHANNEL, params, modechangelist, 2, params.size() - 1);
ServerInstance->Modes.Process(srcuser, chan, NULL, modechangelist, ModeParser::MODE_LOCALONLY | ModeParser::MODE_MERGE);
// Reuse for prefix modes
modechangelist.clear();
}
// Build a new FJOIN for forwarding. Put the correct TS in it and the current modes of the channel
// after applying theirs. If they lost, the prefix modes from their message are not forwarded.
FwdFJoinBuilder fwdfjoin(chan, sourceserver);
// Process every member in the message
irc::spacesepstream users(params.back());
std::string item;
Modes::ChangeList* modechangelistptr = (apply_other_sides_modes ? &modechangelist : NULL);
while (users.GetToken(item))
{
ProcessModeUUIDPair(item, sourceserver, chan, modechangelistptr, fwdfjoin);
}
fwdfjoin.finalize();
fwdfjoin.Forward(sourceserver->GetRoute());
// Set prefix modes on their users if we lost the FJOIN or had equal TS
if (apply_other_sides_modes)
ServerInstance->Modes.Process(srcuser, chan, NULL, modechangelist, ModeParser::MODE_LOCALONLY);
return CMD_SUCCESS;
}