/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2008-2009 Robin Burchell <robin+git@viroteck.net>
*
* 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"
/* $ModDesc: Provides support for channel mode +P to provide permanent channels */
// Not in a class due to circular dependancy hell.
static std::string permchannelsconf;
static bool WriteDatabase()
{
FILE *f;
if (permchannelsconf.empty())
{
// Fake success.
return true;
}
std::string tempname = permchannelsconf + ".tmp";
/*
* We need to perform an atomic write so as not to fuck things up.
* So, let's write to a temporary file, flush and sync the FD, then rename the file..
* -- w00t
*/
f = fopen(tempname.c_str(), "w");
if (!f)
{
ServerInstance->Logs->Log("m_permchannels",DEFAULT, "permchannels: Cannot create database! %s (%d)", strerror(errno), errno);
ServerInstance->SNO->WriteToSnoMask('a', "database: cannot create new db: %s (%d)", strerror(errno), errno);
return false;
}
fputs("# Permchannels DB\n# This file is autogenerated; any changes will be overwritten!\n<config format=\"compat\">\n", f);
// Now, let's write.
for (chan_hash::const_iterator i = ServerInstance->chanlist->begin(); i != ServerInstance->chanlist->end(); i++)
{
Channel* chan = i->second;
if (!chan->IsModeSet('P'))
continue;
char line[1024];
const char* items[] =
{
"<permchannels channel=",
chan->name.c_str(),
" topic=",
chan->topic.c_str(),
" modes=",
chan->ChanModes(true),
">\n"
};
int lpos = 0, item = 0, ipos = 0;
while (lpos < 1022 && item < 7)
{
char c = items[item][ipos++];
if (c == 0)
{
// end of this string; hop to next string, insert a quote
item++;
ipos = 0;
c = '"';
}
else if (c == '\\' || c == '"')
{
line[lpos++] = '\\';
}
line[lpos++] = c;
}
line[--lpos] = 0;
fputs(line, f);
}
int write_error = 0;
write_error = ferror(f);
write_error |= fclose(f);
if (write_error)
{
ServerInstance->Logs->Log("m_permchannels",DEFAULT, "permchannels: Cannot write to new database! %s (%d)", strerror(errno), errno);
ServerInstance->SNO->WriteToSnoMask('a', "database: cannot write to new db: %s (%d)", strerror(errno), errno);
return false;
}
#ifdef _WIN32
if (remove(permchannelsconf.c_str()))
{
ServerInstance->Logs->Log("m_permchannels",DEFAULT, "permchannels: Cannot remove old database! %s (%d)", strerror(errno), errno);
ServerInstance->SNO->WriteToSnoMask('a', "database: cannot remove old database: %s (%d)", strerror(errno), errno);
return false;
}
#endif
// Use rename to move temporary to new db - this is guarenteed not to fuck up, even in case of a crash.
if (rename(tempname.c_str(), permchannelsconf.c_str()) < 0)
{
ServerInstance->Logs->Log("m_permchannels",DEFAULT, "permchannels: Cannot move new to old database! %s (%d)", strerror(errno), errno);
ServerInstance->SNO->WriteToSnoMask('a', "database: cannot replace old with new db: %s (%d)", strerror(errno), errno);
return false;
}
return true;
}
/** Handles the +P channel mode
*/
class PermChannel : public ModeHandler
{
public:
PermChannel(Module* Creator) : ModeHandler(Creator, "permanent", 'P', PARAM_NONE, MODETYPE_CHANNEL) { oper = true; }
ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string ¶meter, bool adding)
{
if (adding)
{
if (!channel->IsModeSet('P'))
{
channel->SetMode('P',true);
return MODEACTION_ALLOW;
}
}
else
{
if (channel->IsModeSet('P'))
{
channel->SetMode(this,false);
if (channel->GetUserCounter() == 0)
{
channel->DelUser(ServerInstance->FakeClient);
}
return MODEACTION_ALLOW;
}
}
return MODEACTION_DENY;
}
};
class ModulePermanentChannels : public Module
{
PermChannel p;
bool dirty;
public:
ModulePermanentChannels() : p(this), dirty(false)
{
}
void init()
{
ServerInstance->Modules->AddService(p);
Implementation eventlist[] = { I_OnChannelPreDelete, I_OnPostTopicChange, I_OnRawMode, I_OnRehash, I_OnBackgroundTimer };
ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
OnRehash(NULL);
}
CullResult cull()
{
/*
* DelMode can't remove the +P mode on empty channels, or it will break
* merging modes with remote servers. Remove the empty channels now as
* we know this is not the case.
*/
chan_hash::iterator iter = ServerInstance->chanlist->begin();
while (iter != ServerInstance->chanlist->end())
{
Channel* c = iter->second;
if (c->GetUserCounter() == 0)
{
chan_hash::iterator at = iter;
iter++;
FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(c));
ServerInstance->chanlist->erase(at);
ServerInstance->GlobalCulls.AddItem(c);
}
else
iter++;
}
ServerInstance->Modes->DelMode(&p);
return Module::cull();
}
virtual void OnRehash(User *user)
{
/*
* Process config-defined list of permanent channels.
* -- w00t
*/
permchannelsconf = ServerInstance->Config->ConfValue("permchanneldb")->getString("filename");
ConfigTagList permchannels = ServerInstance->Config->ConfTags("permchannels");
for (ConfigIter i = permchannels.first; i != permchannels.second; ++i)
{
ConfigTag* tag = i->second;
std::string channel = tag->getString("channel");
std::string topic = tag->getString("topic");
std::string modes = tag->getString("modes");
if (channel.empty())
{
ServerInstance->Logs->Log("blah", DEBUG, "Malformed permchannels tag with empty channel name.");
continue;
}
Channel *c = ServerInstance->FindChan(channel);
if (!c)
{
c = new Channel(channel, ServerInstance->Time());
if (!topic.empty())
{
c->SetTopic(NULL, topic, true);
/*
* Due to the way protocol works in 1.2, we need to hack the topic TS in such a way that this
* topic will always win over others.
*
* This is scheduled for (proper) fixing in a later release, and can be removed at a later date.
*/
c->topicset = 42;
}
ServerInstance->Logs->Log("blah", DEBUG, "Added %s with topic %s", channel.c_str(), topic.c_str());
if (modes.empty())
continue;
irc::spacesepstream list(modes);
std::string modeseq;
std::string par;
list.GetToken(modeseq);
// XXX bleh, should we pass this to the mode parser instead? ugly. --w00t
for (std::string::iterator n = modeseq.begin(); n != modeseq.end(); ++n)
{
ModeHandler* mode = ServerInstance->Modes->FindMode(*n, MODETYPE_CHANNEL);
if (mode)
{
if (mode->GetNumParams(true))
list.GetToken(par);
else
par.clear();
mode->OnModeChange(ServerInstance->FakeClient, ServerInstance->FakeClient, c, par, true);
}
}
}
}
}
virtual ModResult OnRawMode(User* user, Channel* chan, const char mode, const std::string ¶m, bool adding, int pcnt)
{
if (chan && (chan->IsModeSet('P') || mode == 'P'))
dirty = true;
return MOD_RES_PASSTHRU;
}
virtual void OnPostTopicChange(User*, Channel *c, const std::string&)
{
if (c->IsModeSet('P'))
dirty = true;
}
void OnBackgroundTimer(time_t)
{
if (dirty)
WriteDatabase();
dirty = false;
}
virtual Version GetVersion()
{
return Version("Provides support for channel mode +P to provide permanent channels",VF_VENDOR);
}
virtual ModResult OnChannelPreDelete(Channel *c)
{
if (c->IsModeSet('P'))
return MOD_RES_DENY;
return MOD_RES_PASSTHRU;
}
};
MODULE_INIT(ModulePermanentChannels)
