Main Page | Namespace List | Class Hierarchy | Alphabetical List | Class List | Directories | File List | Namespace Members | Class Members | File Members

home » brain » inspircd-cvs » inspircd » src

channels.cpp

Go to the documentation of this file.

/*       +------------------------------------+
 *       | Inspire Internet Relay Chat Daemon |
 *       +------------------------------------+
 *
 *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
 * See: http://www.inspircd.org/wiki/index.php/Credits
 *
 * This program is free but copyrighted software; see
 *            the file COPYING for details.
 *
 * ---------------------------------------------------
 */

/* $Core */

#include "inspircd.h"
#include <cstdarg>
#include "mode.h"

Channel::Channel(InspIRCd* Instance, const std::string &cname, time_t ts) : ServerInstance(Instance)
{
        chan_hash::iterator findchan = ServerInstance->chanlist->find(cname);
        if (findchan != Instance->chanlist->end())
                throw CoreException("Cannot create duplicate channel " + cname);

        (*(ServerInstance->chanlist))[cname.c_str()] = this;
        this->name.assign(cname, 0, ServerInstance->Config->Limits.ChanMax);
        this->created = ts ? ts : ServerInstance->Time();
        this->age = this->created;

        maxbans = topicset = 0;
        modes.reset();
}

void Channel::SetMode(char mode,bool mode_on)
{
        modes[mode-65] = mode_on;
        if (!mode_on)
                this->SetModeParam(mode,"",false);
}


void Channel::SetModeParam(char mode,const char* parameter,bool mode_on)
{
        CustomModeList::iterator n = custom_mode_params.find(mode);

        if (mode_on)
        {
                if (n == custom_mode_params.end())
                        custom_mode_params[mode] = strdup(parameter);
        }
        else
        {
                if (n != custom_mode_params.end())
                {
                        free(n->second);
                        custom_mode_params.erase(n);
                }
        }
}

bool Channel::IsModeSet(char mode)
{
        return modes[mode-65];
}

std::string Channel::GetModeParameter(char mode)
{
        CustomModeList::iterator n = custom_mode_params.find(mode);
        if (n != custom_mode_params.end())
                return n->second;
        return "";
}

int Channel::SetTopic(User *u, std::string &ntopic, bool forceset)
{
        if (u && IS_LOCAL(u))
        {
                if(!forceset)
                {
                        int MOD_RESULT = 0;
                        /* 0: check status, 1: don't, -1: disallow change silently */

                        FOREACH_RESULT(I_OnLocalTopicChange,OnLocalTopicChange(u,this,ntopic));
                
                        if (MOD_RESULT == 1)
                                return CMD_FAILURE;
                        else if (MOD_RESULT == 0)
                        {
                                if (!this->HasUser(u))
                                {
                                        u->WriteNumeric(442, "%s %s :You're not on that channel!",u->nick.c_str(), this->name.c_str());
                                        return CMD_FAILURE;
                                }
                                if ((this->IsModeSet('t')) && (this->GetStatus(u) < STATUS_HOP))
                                {
                                        u->WriteNumeric(482, "%s %s :You must be at least a half-operator to change the topic on this channel", u->nick.c_str(), this->name.c_str());
                                        return CMD_FAILURE;
                                }
                        }
                }
        }

        this->topic.assign(ntopic, 0, ServerInstance->Config->Limits.MaxTopic);
        if (u)
        {
                this->setby.assign(ServerInstance->Config->FullHostInTopic ? u->GetFullHost() : u->nick, 0, 128);
                this->WriteChannel(u, "TOPIC %s :%s", this->name.c_str(), this->topic.c_str());
        }
        else
        {
                this->setby.assign(ServerInstance->Config->ServerName);
                this->WriteChannelWithServ(ServerInstance->Config->ServerName, "TOPIC %s :%s", this->name.c_str(), this->topic.c_str());
        }

        this->topicset = ServerInstance->Time();

        if (u && IS_LOCAL(u))
        {
                FOREACH_MOD(I_OnPostLocalTopicChange,OnPostLocalTopicChange(u, this, this->topic));
        }

        return CMD_SUCCESS;
}

long Channel::GetUserCounter()
{
        return (this->internal_userlist.size());
}

void Channel::AddUser(User* user)
{
        internal_userlist[user] = user->nick;
}

unsigned long Channel::DelUser(User* user)
{
        CUListIter a = internal_userlist.find(user);

        if (a != internal_userlist.end())
        {
                internal_userlist.erase(a);
                /* And tidy any others... */
                DelOppedUser(user);
                DelHalfoppedUser(user);
                DelVoicedUser(user);
        }

        return internal_userlist.size();
}

bool Channel::HasUser(User* user)
{
        return (internal_userlist.find(user) != internal_userlist.end());
}

void Channel::AddOppedUser(User* user)
{
        internal_op_userlist[user] = user->nick;
}

void Channel::DelOppedUser(User* user)
{
        CUListIter a = internal_op_userlist.find(user);
        if (a != internal_op_userlist.end())
        {
                internal_op_userlist.erase(a);
                return;
        }
}

void Channel::AddHalfoppedUser(User* user)
{
        internal_halfop_userlist[user] = user->nick;
}

void Channel::DelHalfoppedUser(User* user)
{
        CUListIter a = internal_halfop_userlist.find(user);

        if (a != internal_halfop_userlist.end())
        {
                internal_halfop_userlist.erase(a);
        }
}

void Channel::AddVoicedUser(User* user)
{
        internal_voice_userlist[user] = user->nick;
}

void Channel::DelVoicedUser(User* user)
{
        CUListIter a = internal_voice_userlist.find(user);

        if (a != internal_voice_userlist.end())
        {
                internal_voice_userlist.erase(a);
        }
}

CUList* Channel::GetUsers()
{
        return &internal_userlist;
}

CUList* Channel::GetOppedUsers()
{
        return &internal_op_userlist;
}

CUList* Channel::GetHalfoppedUsers()
{
        return &internal_halfop_userlist;
}

CUList* Channel::GetVoicedUsers()
{
        return &internal_voice_userlist;
}

void Channel::SetDefaultModes()
{
        ServerInstance->Logs->Log("CHANNELS", DEBUG, "SetDefaultModes %s", ServerInstance->Config->DefaultModes);
        irc::spacesepstream list(ServerInstance->Config->DefaultModes);
        std::string modeseq;
        std::string parameter;

        list.GetToken(modeseq);

        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(parameter);
                        else
                                parameter.clear();

                        mode->OnModeChange(ServerInstance->FakeClient, ServerInstance->FakeClient, this, parameter, true);
                }
        }
}

/*
 * add a channel to a user, creating the record for it if needed and linking
 * it to the user record
 */
Channel* Channel::JoinUser(InspIRCd* Instance, User *user, const char* cn, bool override, const char* key, bool bursting, time_t TS)
{
        if (!user || !cn)
                return NULL;

        char cname[MAXBUF];
        int MOD_RESULT = 0;
        std::string privs;
        Channel *Ptr;

        /*
         * We don't restrict the number of channels that remote users or users that are override-joining may be in.
         * We restrict local users to MaxChans channels.
         * We restrict local operators to OperMaxChans channels.
         * This is a lot more logical than how it was formerly. -- w00t
         */
        if (IS_LOCAL(user) && !override)
        {
                // Checking MyClass exists because we *may* get here with NULL, not 100% sure.
                if (user->MyClass && user->MyClass->GetMaxChans())
                {
                        if (user->chans.size() >= user->MyClass->GetMaxChans())
                        {
                                user->WriteNumeric(ERR_TOOMANYCHANNELS, "%s %s :You are on too many channels",user->nick.c_str(), cn);
                                return NULL;
                        }
                }
                else
                {
                        if (IS_OPER(user))
                        {
                                if (user->chans.size() >= Instance->Config->OperMaxChans)
                                {
                                        user->WriteNumeric(ERR_TOOMANYCHANNELS, "%s %s :You are on too many channels",user->nick.c_str(), cn);
                                        return NULL;
                                }
                        }
                        else
                        {
                                if (user->chans.size() >= Instance->Config->MaxChans)
                                {
                                        user->WriteNumeric(ERR_TOOMANYCHANNELS, "%s %s :You are on too many channels",user->nick.c_str(), cn);
                                        return NULL;
                                }
                        }
                }
        }

        strlcpy(cname, cn, Instance->Config->Limits.ChanMax);
        Ptr = Instance->FindChan(cname);

        if (!Ptr)
        {
                /*
                 * Fix: desync bug was here, don't set @ on remote users - spanningtree handles their permissions. bug #358. -- w00t
                 */
                if (!IS_LOCAL(user))
                {
                        if (!TS)
                                Instance->Logs->Log("CHANNEL",DEBUG,"*** BUG *** Channel::JoinUser called for REMOTE user '%s' on channel '%s' but no TS given!", user->nick.c_str(), cn);
                }
                else
                {
                        privs = "@";
                }

                if (IS_LOCAL(user) && override == false)
                {
                        MOD_RESULT = 0;
                        FOREACH_RESULT_I(Instance,I_OnUserPreJoin, OnUserPreJoin(user, NULL, cname, privs, key ? key : ""));
                        if (MOD_RESULT == 1)
                                return NULL;
                }

                Ptr = new Channel(Instance, cname, TS);
        }
        else
        {
                /* Already on the channel */
                if (Ptr->HasUser(user))
                        return NULL;

                /*
                 * remote users are allowed us to bypass channel modes
                 * and bans (used by servers)
                 */
                if (IS_LOCAL(user) && override == false)
                {
                        MOD_RESULT = 0;
                        FOREACH_RESULT_I(Instance,I_OnUserPreJoin, OnUserPreJoin(user, Ptr, cname, privs, key ? key : ""));
                        if (MOD_RESULT == 1)
                        {
                                return NULL;
                        }
                        else if (MOD_RESULT == 0)
                        {
                                std::string ckey = Ptr->GetModeParameter('k');
                                bool invited = user->IsInvited(Ptr->name.c_str());
                                bool can_bypass = Instance->Config->InvBypassModes && invited;

                                if (!ckey.empty())
                                {
                                        MOD_RESULT = 0;
                                        FOREACH_RESULT_I(Instance, I_OnCheckKey, OnCheckKey(user, Ptr, key ? key : ""));
                                        if (!MOD_RESULT)
                                        {
                                                // If no key provided, or key is not the right one, and can't bypass +k (not invited or option not enabled)
                                                if ((!key || ckey != key) && !can_bypass)
                                                {
                                                        user->WriteNumeric(ERR_BADCHANNELKEY, "%s %s :Cannot join channel (Incorrect channel key)",user->nick.c_str(), Ptr->name.c_str());
                                                        return NULL;
                                                }
                                        }
                                }

                                if (Ptr->IsModeSet('i'))
                                {
                                        MOD_RESULT = 0;
                                        FOREACH_RESULT_I(Instance,I_OnCheckInvite,OnCheckInvite(user, Ptr));
                                        if (!MOD_RESULT)
                                        {
                                                if (!invited)
                                                {
                                                        user->WriteNumeric(ERR_INVITEONLYCHAN, "%s %s :Cannot join channel (Invite only)",user->nick.c_str(), Ptr->name.c_str());
                                                        return NULL;
                                                }
                                        }
                                }

                                std::string limit = Ptr->GetModeParameter('l');
                                if (!limit.empty())
                                {
                                        MOD_RESULT = 0;
                                        FOREACH_RESULT_I(Instance, I_OnCheckLimit, OnCheckLimit(user, Ptr));
                                        if (!MOD_RESULT)
                                        {
                                                long llimit = atol(limit.c_str());
                                                if (Ptr->GetUserCounter() >= llimit && !can_bypass)
                                                {
                                                        user->WriteNumeric(ERR_CHANNELISFULL, "%s %s :Cannot join channel (Channel is full)",user->nick.c_str(), Ptr->name.c_str());
                                                        return NULL;
                                                }
                                        }
                                }

                                if (Ptr->bans.size())
                                {
                                        if (Ptr->IsBanned(user) && !can_bypass)
                                        {
                                                user->WriteNumeric(ERR_BANNEDFROMCHAN, "%s %s :Cannot join channel (You're banned)",user->nick.c_str(), Ptr->name.c_str());
                                                return NULL;
                                        }
                                }

                                /*
                                 * If the user has invites for this channel, remove them now
                                 * after a successful join so they don't build up.
                                 */
                                if (invited)
                                {
                                        user->RemoveInvite(Ptr->name.c_str());
                                }
                        }
                }
        }

        /* As spotted by jilles, dont bother to set this on remote users */
        if (IS_LOCAL(user) && Ptr->GetUserCounter() == 0)
                Ptr->SetDefaultModes();

        return Channel::ForceChan(Instance, Ptr, user, privs, bursting);
}

Channel* Channel::ForceChan(InspIRCd* Instance, Channel* Ptr, User* user, const std::string &privs, bool bursting)
{       
        std::string nick = user->nick;
        bool silent = false;

        Ptr->AddUser(user);

        /* Just in case they have no permissions */
        user->chans[Ptr] = 0;

        for (std::string::const_iterator x = privs.begin(); x != privs.end(); x++)
        {
                const char status = *x;
                ModeHandler* mh = Instance->Modes->FindPrefix(status);
                if (mh)
                {
                        /* Set, and make sure that the mode handler knows this mode was now set */
                        Ptr->SetPrefix(user, status, mh->GetPrefixRank(), true);
                        mh->OnModeChange(Instance->FakeClient, Instance->FakeClient, Ptr, nick, true);

                        switch (mh->GetPrefix())
                        {
                                /* These logic ops are SAFE IN THIS CASE because if the entry doesnt exist,
                                 * addressing operator[] creates it. If they do exist, it points to it.
                                 * At all other times where we dont want to create an item if it doesnt exist, we
                                 * must stick to ::find().
                                 */
                                case '@':
                                        user->chans[Ptr] |= UCMODE_OP;
                                break;
                                case '%':
                                        user->chans[Ptr] |= UCMODE_HOP;
                                break;
                                case '+':
                                        user->chans[Ptr] |= UCMODE_VOICE;
                                break;
                        }
                }
        }

        FOREACH_MOD_I(Instance,I_OnUserJoin,OnUserJoin(user, Ptr, bursting, silent));

        if (!silent)
                Ptr->WriteChannel(user,"JOIN :%s",Ptr->name.c_str());

        /* Theyre not the first ones in here, make sure everyone else sees the modes we gave the user */
        std::string ms = Instance->Modes->ModeString(user, Ptr);
        if ((Ptr->GetUserCounter() > 1) && (ms.length()))
                Ptr->WriteAllExceptSender(user, true, 0, "MODE %s +%s", Ptr->name.c_str(), ms.c_str());

        /* Major improvement by Brain - we dont need to be calculating all this pointlessly for remote users */
        if (IS_LOCAL(user))
        {
                if (Ptr->topicset)
                {
                        user->WriteNumeric(RPL_TOPIC, "%s %s :%s", user->nick.c_str(), Ptr->name.c_str(), Ptr->topic.c_str());
                        user->WriteNumeric(RPL_TOPICTIME, "%s %s %s %lu", user->nick.c_str(), Ptr->name.c_str(), Ptr->setby.c_str(), (unsigned long)Ptr->topicset);
                }
                Ptr->UserList(user);
        }
        FOREACH_MOD_I(Instance,I_OnPostJoin,OnPostJoin(user, Ptr));
        return Ptr;
}

bool Channel::IsBanned(User* user)
{
        char mask[MAXBUF];
        int MOD_RESULT = 0;
        FOREACH_RESULT(I_OnCheckBan,OnCheckBan(user, this));

        if (MOD_RESULT == -1)
                return true;
        else if (MOD_RESULT == 0)
        {
                snprintf(mask, MAXBUF, "%s!%s@%s", user->nick.c_str(), user->ident.c_str(), user->GetIPString());
                for (BanList::iterator i = this->bans.begin(); i != this->bans.end(); i++)
                {
                        if ((InspIRCd::Match(user->GetFullHost(),i->data, NULL)) || // host
                                (InspIRCd::Match(user->GetFullRealHost(),i->data, NULL)) || // uncloaked host
                                (InspIRCd::MatchCIDR(mask, i->data, NULL))) // ip
                        {
                                return true;
                        }
                }
        }
        return false;
}

bool Channel::IsExtBanned(const std::string &str, char type)
{
        int MOD_RESULT = 0;
        FOREACH_RESULT(I_OnCheckStringExtBan, OnCheckStringExtBan(str, this, type));

        if (MOD_RESULT == -1)
                return true;
        else if (MOD_RESULT == 0)
        {
                for (BanList::iterator i = this->bans.begin(); i != this->bans.end(); i++)
                {
                        if (i->data[0] != type || i->data[1] != ':')
                                continue;

                        // Iterate past char and : to get to the mask without doing a data copy(!)
                        std::string maskptr = i->data.substr(2);
                        ServerInstance->Logs->Log("EXTBANS", DEBUG, "Checking %s against %s, type is %c", str.c_str(), maskptr.c_str(), type);

                        if (InspIRCd::Match(str, maskptr, NULL))
                                return true;
                }
        }

        return false;
}

bool Channel::IsExtBanned(User *user, char type)
{
        int MOD_RESULT = 0;
        FOREACH_RESULT(I_OnCheckExtBan, OnCheckExtBan(user, this, type));

        if (MOD_RESULT == -1)
                return true;
        else if (MOD_RESULT == 0)
        {
                char mask[MAXBUF];
                snprintf(mask, MAXBUF, "%s!%s@%s", user->nick.c_str(), user->ident.c_str(), user->GetIPString());

                // XXX: we should probably hook cloaked hosts in here somehow too..
                if (this->IsExtBanned(mask, type))
                        return true;

                if (this->IsExtBanned(user->GetFullHost(), type))
                        return true;

                if (this->IsExtBanned(user->GetFullRealHost(), type))
                        return true;
        }

        return false;
}

/* Channel::PartUser
 * remove a channel from a users record, and return the number of users left.
 * Therefore, if this function returns 0 the caller should delete the Channel.
 */
long Channel::PartUser(User *user, std::string &reason)
{
        bool silent = false;

        if (!user)
                return this->GetUserCounter();

        UCListIter i = user->chans.find(this);
        if (i != user->chans.end())
        {
                FOREACH_MOD(I_OnUserPart,OnUserPart(user, this, reason, silent));

                if (!silent)
                        this->WriteChannel(user, "PART %s%s%s", this->name.c_str(), reason.empty() ? "" : " :", reason.c_str());

                user->chans.erase(i);
                this->RemoveAllPrefixes(user);
        }

        if (!this->DelUser(user)) /* if there are no users left on the channel... */
        {
                chan_hash::iterator iter = ServerInstance->chanlist->find(this->name);
                /* kill the record */
                if (iter != ServerInstance->chanlist->end())
                {
                        int MOD_RESULT = 0;
                        FOREACH_RESULT_I(ServerInstance,I_OnChannelPreDelete, OnChannelPreDelete(this));
                        if (MOD_RESULT == 1)
                                return 1; // delete halted by module
                        FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(this));
                        ServerInstance->chanlist->erase(iter);
                }
                return 0;
        }

        return this->GetUserCounter();
}

long Channel::ServerKickUser(User* user, const char* reason, bool triggerevents, const char* servername)
{
        bool silent = false;

        if (!user || !reason)
                return this->GetUserCounter();

        if (IS_LOCAL(user))
        {
                if (!this->HasUser(user))
                {
                        /* Not on channel */
                        return this->GetUserCounter();
                }
        }

        if (servername == NULL || *ServerInstance->Config->HideWhoisServer)
                servername = ServerInstance->Config->ServerName;

        if (triggerevents)
        {
                FOREACH_MOD(I_OnUserKick,OnUserKick(NULL, user, this, reason, silent));
        }

        UCListIter i = user->chans.find(this);
        if (i != user->chans.end())
        {
                if (!silent)
                        this->WriteChannelWithServ(servername, "KICK %s %s :%s", this->name.c_str(), user->nick.c_str(), reason);

                user->chans.erase(i);
                this->RemoveAllPrefixes(user);
        }

        if (!this->DelUser(user))
        {
                chan_hash::iterator iter = ServerInstance->chanlist->find(this->name);
                /* kill the record */
                if (iter != ServerInstance->chanlist->end())
                {
                        int MOD_RESULT = 0;
                        FOREACH_RESULT_I(ServerInstance,I_OnChannelPreDelete, OnChannelPreDelete(this));
                        if (MOD_RESULT == 1)
                                return 1; // delete halted by module
                        FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(this));
                        ServerInstance->chanlist->erase(iter);
                }
                return 0;
        }

        return this->GetUserCounter();
}

long Channel::KickUser(User *src, User *user, const char* reason)
{
        bool silent = false;

        if (!src || !user || !reason)
                return this->GetUserCounter();

        if (IS_LOCAL(src))
        {
                if (!this->HasUser(user))
                {
                        src->WriteNumeric(ERR_USERNOTINCHANNEL, "%s %s %s :They are not on that channel",src->nick.c_str(), user->nick.c_str(), this->name.c_str());
                        return this->GetUserCounter();
                }
                if ((ServerInstance->ULine(user->server)) && (!ServerInstance->ULine(src->server)))
                {
                        src->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s %s :Only a u-line may kick a u-line from a channel.",src->nick.c_str(), this->name.c_str());
                        return this->GetUserCounter();
                }
                int MOD_RESULT = 0;

                if (!ServerInstance->ULine(src->server))
                {
                        MOD_RESULT = 0;
                        FOREACH_RESULT(I_OnUserPreKick,OnUserPreKick(src,user,this,reason));
                        if (MOD_RESULT == 1)
                                return this->GetUserCounter();
                }
                /* Set to -1 by OnUserPreKick if explicit allow was set */
                if (MOD_RESULT != -1)
                {
                        FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(src,user,this,AC_KICK));
                        if ((MOD_RESULT == ACR_DENY) && (!ServerInstance->ULine(src->server)))
                                return this->GetUserCounter();

                        if ((MOD_RESULT == ACR_DEFAULT) || (!ServerInstance->ULine(src->server)))
                        {
                                int them = this->GetStatus(src);
                                int us = this->GetStatus(user);
                                if ((them < STATUS_HOP) || (them < us))
                                {
                                        src->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s %s :You must be a channel %soperator",src->nick.c_str(), this->name.c_str(), them == STATUS_HOP ? "" : "half-");
                                        return this->GetUserCounter();
                                }
                        }
                }
        }

        FOREACH_MOD(I_OnUserKick,OnUserKick(src, user, this, reason, silent));

        UCListIter i = user->chans.find(this);
        if (i != user->chans.end())
        {
                /* zap it from the channel list of the user */
                if (!silent)
                        this->WriteChannel(src, "KICK %s %s :%s", this->name.c_str(), user->nick.c_str(), reason);

                user->chans.erase(i);
                this->RemoveAllPrefixes(user);
        }

        if (!this->DelUser(user))
        /* if there are no users left on the channel */
        {
                chan_hash::iterator iter = ServerInstance->chanlist->find(this->name.c_str());

                /* kill the record */
                if (iter != ServerInstance->chanlist->end())
                {
                        int MOD_RESULT = 0;
                        FOREACH_RESULT_I(ServerInstance,I_OnChannelPreDelete, OnChannelPreDelete(this));
                        if (MOD_RESULT == 1)
                                return 1; // delete halted by module
                        FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(this));
                        ServerInstance->chanlist->erase(iter);
                }
                return 0;
        }

        return this->GetUserCounter();
}

void Channel::WriteChannel(User* user, const char* text, ...)
{
        char textbuffer[MAXBUF];
        va_list argsPtr;

        if (!user || !text)
                return;

        va_start(argsPtr, text);
        vsnprintf(textbuffer, MAXBUF, text, argsPtr);
        va_end(argsPtr);

        this->WriteChannel(user, std::string(textbuffer));
}

void Channel::WriteChannel(User* user, const std::string &text)
{
        CUList *ulist = this->GetUsers();
        char tb[MAXBUF];

        if (!user)
                return;

        snprintf(tb,MAXBUF,":%s %s", user->GetFullHost().c_str(), text.c_str());
        std::string out = tb;

        for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
        {
                if (IS_LOCAL(i->first))
                        i->first->Write(out);
        }
}

void Channel::WriteChannelWithServ(const char* ServName, const char* text, ...)
{
        char textbuffer[MAXBUF];
        va_list argsPtr;

        if (!text)
                return;

        va_start(argsPtr, text);
        vsnprintf(textbuffer, MAXBUF, text, argsPtr);
        va_end(argsPtr);

        this->WriteChannelWithServ(ServName, std::string(textbuffer));
}

void Channel::WriteChannelWithServ(const char* ServName, const std::string &text)
{
        CUList *ulist = this->GetUsers();
        char tb[MAXBUF];

        snprintf(tb,MAXBUF,":%s %s", ServName ? ServName : ServerInstance->Config->ServerName, text.c_str());
        std::string out = tb;

        for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
        {
                if (IS_LOCAL(i->first))
                        i->first->Write(out);
        }
}

/* write formatted text from a source user to all users on a channel except
 * for the sender (for privmsg etc) */
void Channel::WriteAllExceptSender(User* user, bool serversource, char status, const char* text, ...)
{
        char textbuffer[MAXBUF];
        va_list argsPtr;

        if (!text)
                return;

        va_start(argsPtr, text);
        vsnprintf(textbuffer, MAXBUF, text, argsPtr);
        va_end(argsPtr);

        this->WriteAllExceptSender(user, serversource, status, std::string(textbuffer));
}

void Channel::WriteAllExcept(User* user, bool serversource, char status, CUList &except_list, const char* text, ...)
{
        char textbuffer[MAXBUF];
        va_list argsPtr;

        if (!text)
                return;

        va_start(argsPtr, text);
        vsnprintf(textbuffer, MAXBUF, text, argsPtr);
        va_end(argsPtr);

        this->WriteAllExcept(user, serversource, status, except_list, std::string(textbuffer));
}

void Channel::WriteAllExcept(User* user, bool serversource, char status, CUList &except_list, const std::string &text)
{
        CUList *ulist = this->GetUsers();
        char tb[MAXBUF];

        snprintf(tb,MAXBUF,":%s %s", user->GetFullHost().c_str(), text.c_str());
        std::string out = tb;

        for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
        {
                if ((IS_LOCAL(i->first)) && (except_list.find(i->first) == except_list.end()))
                {
                        /* User doesnt have the status we're after */
                        if (status && !strchr(this->GetAllPrefixChars(i->first), status))
                                continue;

                        if (serversource)
                                i->first->WriteServ(text);
                        else
                                i->first->Write(out);
                }
        }
}

void Channel::WriteAllExceptSender(User* user, bool serversource, char status, const std::string& text)
{
        CUList except_list;
        except_list[user] = user->nick;
        this->WriteAllExcept(user, serversource, status, except_list, std::string(text));
}

/*
 * return a count of the users on a specific channel accounting for
 * invisible users who won't increase the count. e.g. for /LIST
 */
int Channel::CountInvisible()
{
        int count = 0;
        CUList *ulist= this->GetUsers();
        for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
        {
                if (!(i->first->IsModeSet('i')))
                        count++;
        }

        return count;
}

char* Channel::ChanModes(bool showkey)
{
        static char scratch[MAXBUF];
        static char sparam[MAXBUF];
        char* offset = scratch;
        std::string extparam;

        *scratch = '\0';
        *sparam = '\0';

        /* This was still iterating up to 190, Channel::modes is only 64 elements -- Om */
        for(int n = 0; n < 64; n++)
        {
                if(this->modes[n])
                {
                        *offset++ = n + 65;
                        extparam.clear();
                        switch (n)
                        {
                                case CM_KEY:
                                        // Unfortunately this must be special-cased, as we definitely don't want to always display key.
                                        if (showkey)
                                        {
                                                extparam = this->GetModeParameter('k');
                                        }
                                        else
                                        {
                                                extparam = "<key>";
                                        }
                                        break;
                                case CM_NOEXTERNAL:
                                case CM_TOPICLOCK:
                                case CM_INVITEONLY:
                                case CM_MODERATED:
                                case CM_SECRET:
                                case CM_PRIVATE:
                                        /* We know these have no parameters */
                                break;
                                default:
                                        extparam = this->GetModeParameter(n + 65);
                                break;
                        }
                        if (!extparam.empty())
                        {
                                charlcat(sparam,' ',MAXBUF);
                                strlcat(sparam,extparam.c_str(),MAXBUF);
                        }
                }
        }

        /* Null terminate scratch */
        *offset = '\0';
        strlcat(scratch,sparam,MAXBUF);
        return scratch;
}

/* compile a userlist of a channel into a string, each nick seperated by
 * spaces and op, voice etc status shown as @ and +, and send it to 'user'
 */
void Channel::UserList(User *user, CUList *ulist)
{
        char list[MAXBUF];
        size_t dlen, curlen;
        int MOD_RESULT = 0;
        bool call_modules = true;

        if (!IS_LOCAL(user))
                return;

        FOREACH_RESULT(I_OnUserList,OnUserList(user, this, ulist));
        if (MOD_RESULT == 1)
                call_modules = false;

        if (MOD_RESULT != -1)
        {
                if ((this->IsModeSet('s')) && (!this->HasUser(user)))
                {
                        user->WriteNumeric(ERR_NOSUCHNICK, "%s %s :No such nick/channel",user->nick.c_str(), this->name.c_str());
                        return;
                }
        }

        dlen = curlen = snprintf(list,MAXBUF,"%s %c %s :", user->nick.c_str(), this->IsModeSet('s') ? '@' : this->IsModeSet('p') ? '*' : '=',  this->name.c_str());

        int numusers = 0;
        char* ptr = list + dlen;

        if (!ulist)
                ulist = this->GetUsers();

        /* Improvement by Brain - this doesnt change in value, so why was it inside
         * the loop?
         */
        bool has_user = this->HasUser(user);

        for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
        {
                if ((!has_user) && (i->first->IsModeSet('i')))
                {
                        /*
                         * user is +i, and source not on the channel, does not show
                         * nick in NAMES list