+/*
+ * InspIRCd -- Internet Relay Chat Daemon
+ *
+ * Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
+ * Copyright (C) 2007, 2009 Robin Burchell <robin+git@viroteck.net>
+ * Copyright (C) 2008 Pippijn van Steenhoven <pip88nl@gmail.com>
+ * Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
+ * Copyright (C) 2007 Craig Edwards <craigedwards@brainbox.cc>
+ * Copyright (C) 2007 Oliver Lupton <oliverlupton@gmail.com>
+ *
+ * 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 "listmode.h"
+
+/* $ModDesc: Allows an extended ban (+b) syntax redirecting banned users to another channel */
+
+/* Originally written by Om, January 2009
+ */
+
+class BanRedirectEntry
+{
+ public:
+ std::string targetchan;
+ std::string banmask;
+
+ BanRedirectEntry(const std::string &target = "", const std::string &mask = "")
+ : targetchan(target), banmask(mask)
+ {
+ }
+};
+
+typedef std::vector<BanRedirectEntry> BanRedirectList;
+
+class BanRedirect : public ModeWatcher
+{
+ ModeReference ban;
+ public:
+ SimpleExtItem<BanRedirectList> extItem;
+ BanRedirect(Module* parent)
+ : ModeWatcher(parent, 'b', MODETYPE_CHANNEL)
+ , ban(parent, "ban")
+ , extItem("banredirect", parent)
+ {
+ }
+
+ bool BeforeMode(User* source, User* dest, Channel* channel, std::string ¶m, bool adding, ModeType type)
+ {
+ /* nick!ident@host -> nick!ident@host
+ * nick!ident@host#chan -> nick!ident@host#chan
+ * nick@host#chan -> nick!*@host#chan
+ * nick!ident#chan -> nick!ident@*#chan
+ * nick#chan -> nick!*@*#chan
+ */
+
+ if(channel && (type == MODETYPE_CHANNEL) && param.length())
+ {
+ BanRedirectList* redirects;
+
+ std::string mask[4];
+ enum { NICK, IDENT, HOST, CHAN } current = NICK;
+ std::string::iterator start_pos = param.begin();
+
+ if (param.length() >= 2 && param[1] == ':')
+ return true;
+
+ ListModeBase* banlm = static_cast<ListModeBase*>(*ban);
+ unsigned int maxbans = banlm->GetLimit(channel);
+ ListModeBase::ModeList* list = banlm->GetList(channel);
+ if ((list) && (adding) && (maxbans <= list->size()))
+ {
+ source->WriteNumeric(478, "%s %s :Channel ban list for %s is full (maximum entries for this channel is %u)", source->nick.c_str(), channel->name.c_str(), channel->name.c_str(), maxbans);
+ return false;
+ }
+
+ for(std::string::iterator curr = start_pos; curr != param.end(); curr++)
+ {
+ switch(*curr)
+ {
+ case '!':
+ mask[current].assign(start_pos, curr);
+ current = IDENT;
+ start_pos = curr+1;
+ break;
+ case '@':
+ mask[current].assign(start_pos, curr);
+ current = HOST;
+ start_pos = curr+1;
+ break;
+ case '#':
+ /* bug #921: don't barf when redirecting to ## channels */
+ if (current != CHAN)
+ {
+ mask[current].assign(start_pos, curr);
+ current = CHAN;
+ start_pos = curr;
+ }
+ break;
+ }
+ }
+
+ if(mask[current].empty())
+ {
+ mask[current].assign(start_pos, param.end());
+ }
+
+ /* nick@host wants to be changed to *!nick@host rather than nick!*@host... */
+ if(mask[NICK].length() && mask[HOST].length() && mask[IDENT].empty())
+ {
+ /* std::string::swap() is fast - it runs in constant time */
+ mask[NICK].swap(mask[IDENT]);
+ }
+
+ for(int i = 0; i < 3; i++)
+ {
+ if(mask[i].empty())
+ {
+ mask[i].assign("*");
+ }
+ }
+
+ param.assign(mask[NICK]).append(1, '!').append(mask[IDENT]).append(1, '@').append(mask[HOST]);
+
+ if(mask[CHAN].length())
+ {
+ if (adding && IS_LOCAL(source))
+ {
+ if (!ServerInstance->IsChannel(mask[CHAN].c_str(), ServerInstance->Config->Limits.ChanMax))
+ {
+ source->WriteNumeric(403, "%s %s :Invalid channel name in redirection (%s)", source->nick.c_str(), channel->name.c_str(), mask[CHAN].c_str());
+ return false;
+ }
+
+ Channel *c = ServerInstance->FindChan(mask[CHAN]);
+ if (!c)
+ {
+ source->WriteNumeric(690, "%s :Target channel %s must exist to be set as a redirect.",source->nick.c_str(),mask[CHAN].c_str());
+ return false;
+ }
+ else if (adding && c->GetPrefixValue(source) < OP_VALUE)
+ {
+ source->WriteNumeric(690, "%s :You must be opped on %s to set it as a redirect.",source->nick.c_str(), mask[CHAN].c_str());
+ return false;
+ }
+
+ if (assign(channel->name) == mask[CHAN])
+ {
+ source->WriteNumeric(690, "%s %s :You cannot set a ban redirection to the channel the ban is on", source->nick.c_str(), channel->name.c_str());
+ return false;
+ }
+ }
+
+ if(adding)
+ {
+ /* It's a properly valid redirecting ban, and we're adding it */
+ redirects = extItem.get(channel);
+ if (!redirects)
+ {
+ redirects = new BanRedirectList;
+ extItem.set(channel, redirects);
+ }
+
+ /* Here 'param' doesn't have the channel on it yet */
+ redirects->push_back(BanRedirectEntry(mask[CHAN], param));
+
+ /* Now it does */
+ param.append(mask[CHAN]);
+ }
+ else
+ {
+ /* Removing a ban, if there's no extensible there are no redirecting bans and we're fine. */
+ redirects = extItem.get(channel);
+ if (redirects)
+ {
+ /* But there were, so we need to remove the matching one if there is one */
+
+ for(BanRedirectList::iterator redir = redirects->begin(); redir != redirects->end(); redir++)
+ {
+ /* Ugly as fuck */
+ if((irc::string(redir->targetchan.c_str()) == irc::string(mask[CHAN].c_str())) && (irc::string(redir->banmask.c_str()) == irc::string(param.c_str())))
+ {
+ redirects->erase(redir);
+
+ if(redirects->empty())
+ {
+ extItem.unset(channel);
+ }
+
+ break;
+ }
+ }
+ }
+
+ /* Append the channel so the default +b handler can remove the entry too */
+ param.append(mask[CHAN]);
+ }
+ }
+ }
+
+ return true;
+ }
+};
+
+class ModuleBanRedirect : public Module
+{
+ BanRedirect re;
+ bool nofollow;
+
+ public:
+ ModuleBanRedirect()
+ : re(this)
+ {
+ nofollow = false;
+ }
+
+
+ void init()
+ {
+ if(!ServerInstance->Modes->AddModeWatcher(&re))
+ throw ModuleException("Could not add mode watcher");
+
+ ServerInstance->Modules->AddService(re.extItem);
+ Implementation list[] = { I_OnUserPreJoin };
+ ServerInstance->Modules->Attach(list, this, sizeof(list)/sizeof(Implementation));
+ }
+
+ virtual void OnCleanup(int target_type, void* item)
+ {
+ if(target_type == TYPE_CHANNEL)
+ {
+ Channel* chan = static_cast<Channel*>(item);
+ BanRedirectList* redirects = re.extItem.get(chan);
+
+ if(redirects)
+ {
+ irc::modestacker modestack(false);
+ std::vector<std::string> stackresult;
+ std::vector<std::string> mode_junk;
+ mode_junk.push_back(chan->name);
+
+ for(BanRedirectList::iterator i = redirects->begin(); i != redirects->end(); i++)
+ {
+ modestack.Push('b', i->targetchan.insert(0, i->banmask));
+ }
+
+ for(BanRedirectList::iterator i = redirects->begin(); i != redirects->end(); i++)
+ {
+ modestack.PushPlus();
+ modestack.Push('b', i->banmask);
+ }
+
+ while(modestack.GetStackedLine(stackresult))
+ {
+ mode_junk.insert(mode_junk.end(), stackresult.begin(), stackresult.end());
+ ServerInstance->SendMode(mode_junk, ServerInstance->FakeClient);
+ mode_junk.erase(mode_junk.begin() + 1, mode_junk.end());
+ }
+ }
+ }
+ }
+
+ virtual ModResult OnUserPreJoin(User* user, Channel* chan, const std::string& cname, std::string &privs, const std::string &keygiven)
+ {
+ if (chan)
+ {
+ BanRedirectList* redirects = re.extItem.get(chan);
+
+ if (redirects)
+ {
+ /* We actually had some ban redirects to check */
+
+ /* This was replaced with user->MakeHostIP() when I had a snprintf(), but MakeHostIP() doesn't seem to add the nick.
+ * Maybe we should have a GetFullIPHost() or something to match GetFullHost() and GetFullRealHost?
+ */
+
+ ModResult result;
+ FIRST_MOD_RESULT(OnCheckChannelBan, result, (user, chan));
+ if (result == MOD_RES_ALLOW)
+ {
+ // they have a ban exception
+ return MOD_RES_PASSTHRU;
+ }
+
+ std::string ipmask(user->nick);
+ ipmask.append(1, '!').append(user->MakeHostIP());
+
+ for(BanRedirectList::iterator redir = redirects->begin(); redir != redirects->end(); redir++)
+ {
+ if(InspIRCd::Match(user->GetFullRealHost(), redir->banmask) || InspIRCd::Match(user->GetFullHost(), redir->banmask) || InspIRCd::MatchCIDR(ipmask, redir->banmask))
+ {
+ /* This prevents recursion when a user sets multiple ban redirects in a chain
+ * (thanks Potter)
+ *
+ * If we're here and nofollow is true then we're already redirecting this user
+ * and there's a redirecting ban set on this channel that matches him, too.
+ * Deny both joins.
+ */
+ if (nofollow)
+ return MOD_RES_DENY;
+
+ /* tell them they're banned and are being transferred */
+ Channel* destchan = ServerInstance->FindChan(redir->targetchan);
+ std::string destlimit;
+
+ if (destchan)
+ destlimit = destchan->GetModeParameter('l');
+
+ if(destchan && ServerInstance->Modules->Find("m_redirect.so") && destchan->IsModeSet('L') && !destlimit.empty() && (destchan->GetUserCounter() >= atoi(destlimit.c_str())))
+ {
+ user->WriteNumeric(474, "%s %s :Cannot join channel (You are banned)", user->nick.c_str(), chan->name.c_str());
+ return MOD_RES_DENY;
+ }
+ else
+ {
+ user->WriteNumeric(474, "%s %s :Cannot join channel (You are banned)", user->nick.c_str(), chan->name.c_str());
+ user->WriteNumeric(470, "%s %s %s :You are banned from this channel, so you are automatically transfered to the redirected channel.", user->nick.c_str(), chan->name.c_str(), redir->targetchan.c_str());
+ nofollow = true;
+ Channel::JoinUser(user, redir->targetchan, false, "", false, ServerInstance->Time());
+ nofollow = false;
+ return MOD_RES_DENY;
+ }
+ }
+ }
+ }
+ }
+ return MOD_RES_PASSTHRU;
+ }
+
+ virtual ~ModuleBanRedirect()
+ {
+ /* XXX is this the best place to do this? */
+ if (!ServerInstance->Modes->DelModeWatcher(&re))
+ ServerInstance->Logs->Log("m_banredirect.so", LOG_DEBUG, "Failed to delete modewatcher!");
+ }
+
+ virtual Version GetVersion()
+ {
+ return Version("Allows an extended ban (+b) syntax redirecting banned users to another channel", VF_COMMON|VF_VENDOR);
+ }
+};
+
+MODULE_INIT(ModuleBanRedirect)