path: root/src/users.cpp

/* Routines to maintain a list of online users.
 *
 * (C) 2003-2011 Anope Team
 * Contact us at team@anope.org
 *
 * Please read COPYING and README for further details.
 *
 * Based on the original code of Epona by Lara.
 * Based on the original code of Services by Andy Church.
 */

#include "services.h"
#include "modules.h"

Anope::insensitive_map<User *> UserListByNick;
Anope::map<User *> UserListByUID;

int32 opcnt = 0;
uint32 usercnt = 0, maxusercnt = 0;
time_t maxusertime;

/*************************************************************************/
/*************************************************************************/

User::User(const Anope::string &snick, const Anope::string &sident, const Anope::string &shost, const Anope::string &suid) : modes(UserModeNameStrings)
{
	if (snick.empty() || sident.empty() || shost.empty())
		throw CoreException("Bad args passed to User::User");

	// XXX: we should also duplicate-check here.

	/* we used to do this by calloc, no more. */
	server = NULL;
	nc = NULL;
	invalid_pw_count = invalid_pw_time = lastmemosend = lastnickreg = lastmail = 0;
	OnAccess = false;
	timestamp = my_signon = Anope::CurTime;

	this->nick = snick;
	this->ident = sident;
	this->host = shost;
	this->uid = suid;
	this->SuperAdmin = false;

	UserListByNick[snick] = this;
	if (!suid.empty())
		UserListByUID[suid] = this;

	this->nc = NULL;

	++usercnt;

	if (usercnt > maxusercnt)
	{
		maxusercnt = usercnt;
		maxusertime = Anope::CurTime;
		Log(this, "maxusers") << "connected - new maximum user count: " << maxusercnt;
	}
}

void User::SetNewNick(const Anope::string &newnick)
{
	/* Sanity check to make sure we don't segfault */
	if (newnick.empty())
		throw CoreException("User::SetNewNick() got a bad argument");

	UserListByNick.erase(this->nick);

	this->nick = newnick;

	UserListByNick[this->nick] = this;

	OnAccess = false;
	NickAlias *na = findnick(this->nick);
	if (na)
		OnAccess = is_on_access(this, na->nc);
}

void User::SetDisplayedHost(const Anope::string &shost)
{
	if (shost.empty())
		throw CoreException("empty host? in MY services? it seems it's more likely than I thought.");

	this->vhost = shost;

	Log(this, "host") << "changed vhost to " << shost;

	this->UpdateHost();
}

/** Get the displayed vhost of a user record.
 * @return The displayed vhost of the user, where ircd-supported, or the user's real host.
 */
const Anope::string &User::GetDisplayedHost() const
{
	if (ircd->vhost && !this->vhost.empty())
		return this->vhost;
	else if (this->HasMode(UMODE_CLOAK) && !this->GetCloakedHost().empty())
		return this->GetCloakedHost();
	else
		return this->host;
}

/** Update the cloaked host of a user
 * @param host The cloaked host
 */
void User::SetCloakedHost(const Anope::string &newhost)
{
	if (newhost.empty())
		throw "empty host in User::SetCloakedHost";

	chost = newhost;

	Log(this, "host") << "changed cloaked host to " << newhost;

	this->UpdateHost();
}

/** Get the cloaked host of a user
 * @return The cloaked host
 */
const Anope::string &User::GetCloakedHost() const
{
	return chost;
}

const Anope::string &User::GetUID() const
{
	return this->uid;
}

void User::SetVIdent(const Anope::string &sident)
{
	this->vident = sident;

	Log(this, "ident") << "changed vident to " << sident;

	this->UpdateHost();
}

const Anope::string &User::GetVIdent() const
{
	if (this->HasMode(UMODE_CLOAK) || (ircd->vident && !this->vident.empty()))
		return this->vident;
	else
		return this->ident;
}

void User::SetIdent(const Anope::string &sident)
{
	this->ident = sident;

	Log(this, "ident") << "changed real ident to " << sident;

	this->UpdateHost();
}

const Anope::string &User::GetIdent() const
{
	return this->ident;
}

Anope::string User::GetMask() const
{
	return this->nick + "!" + this->ident + "@" + this->host;
}

Anope::string User::GetDisplayedMask() const
{
	return this->nick + "!" + this->GetVIdent() + "@" + this->GetDisplayedHost();
}

void User::SetRealname(const Anope::string &srealname)
{
	if (srealname.empty())
		throw CoreException("realname empty in SetRealname");

	this->realname = srealname;
	NickAlias *na = findnick(this->nick);

	if (na && (this->IsIdentified(true) || this->IsRecognized()))
		na->last_realname = srealname;

	Log(this, "realname") << "changed realname to " << srealname;
}

User::~User()
{
	Log(LOG_DEBUG_2) << "User::~User() called";

	Log(this, "disconnect") << "(" << this->realname << ") " << "disconnected from the network (" << this->server->GetName() << ")";


	FOREACH_MOD(I_OnUserLogoff, OnUserLogoff(this));

	ModeManager::StackerDel(this);
	this->Logout();

	--usercnt;

	if (this->HasMode(UMODE_OPER))
		--opcnt;

	while (!this->chans.empty())
		this->chans.front()->chan->DeleteUser(this);

	UserListByNick.erase(this->nick);
	if (!this->uid.empty())
		UserListByUID.erase(this->uid);

	NickAlias *na = findnick(this->nick);
	if (na)
		na->OnCancel(this);

	Log(LOG_DEBUG_2) << "User::~User() done";
}

void User::SendMessage(BotInfo *source, const char *fmt, ...)
{
	va_list args;
	char buf[BUFSIZE] = "";

	if (fmt)
	{
		va_start(args, fmt);
		vsnprintf(buf, BUFSIZE - 1, fmt, args);

		this->SendMessage(source, Anope::string(buf));

		va_end(args);
	}
}

void User::SendMessage(BotInfo *source, Anope::string msg)
{
	const char *translated_message = translate(this, msg.c_str());

	/* Send privmsg instead of notice if:
	* - UsePrivmsg is enabled
	* - The user is not registered and NSDefMsg is enabled
	* - The user is registered and has set /ns set msg on
	*/
	sepstream sep(translated_message, '\n');
	Anope::string tok;
	while (sep.GetToken(tok))
	{
		if (Config->UsePrivmsg && ((!this->nc && Config->NSDefFlags.HasFlag(NI_MSG)) || (this->nc && this->nc->HasFlag(NI_MSG))))
			ircdproto->SendPrivmsg(source, this->nick, "%s", tok.c_str());
		else
			ircdproto->SendNotice(source, this->nick, "%s", tok.c_str());
	}
}

/** Collides a nick.
 *
 * First, it marks the nick (if the user is on a registered nick, we don't use it without but it could be)
 * as COLLIDED, this is checked in NickAlias::OnCancel.
 *
 * Then it does one of two things.
 *
 * 1. This will force change the users nick to the guest nick. This gets processed by the IRCd and comes
 *    back to call do_nick. do_nick changes the nick of the use to the new one, then calls NickAlias::OnCancel
 *    with the users old nick's nickalias (if there is one).
 *
 * 2. Calls User::Kill, which will either delete the user immediatly or kill them, wait for the QUIT,
 *    then delete the user then. Users destructor then calls NickAlias::OnCancel
 *
 * NickAlias::OnCancel checks for NS_COLLIDED, it then does one of two things.
 *
 * 1. If supported, we send a SVSHold for the user. We are done here, the IRCds expires this at the time we give it.
 *
 * 2. We create a new client with SendClientIntroduction(). Note that is it important that this is called either after the
 *    user has been removed from our internal list of user or after the users nick has been updated completely internally.
 *    This is beacuse SendClientIntroduction will destroy any users we think are currently on the nickname (which causes a
 *    lot of problems, eg, deleting the user which recalls OnCancel), whether they really are or not. We then create a
 *    release timer for this new client that waits and later on sends a QUIT for the client. Release timers are never used
 *    for SVSHolds. Ever.
 *
 *
 *  Note that now for the timers we only store the users name, not the NickAlias* pointer. We never remove timers when
 *  a user changes nick or a nick is deleted, the timers must assume that either of these may have happend.
 *
 *  Storing NickAlias* pointers caused quite a problem, some of which are:
 *
 *  Having a valid timer alive that calls User::Collide would either:
 *
 *  1. Kill the user, causing users destructor to cancel all timers for the nick (as it should, it has no way of knowing
 *     if we are in a timer or not) which would delete the currently active timer while it was running, causing TimerManager
 *     to explode.
 *
 *  2. Force a user off of their nick, this would call NickAlias::Cancel before updating the user internally (to cancel the
 *     current nicks timers, granted we could have easially saved this and called it after) which could possibly try to
 *     introduce an enforcer nick. We would then check to see if the nick is already in use (it is, internally) and send
 *     a kill for that nick. That may in turn delete the user immediatly, calling users destructor, which would attempt to
 *     delete the timer, causing TimerManager to explode.
 *
 *     Additionally, if we marked the timer as "in use" so that calling the ClearTimer function wouldn't delete them, users
 *     destructor would then call NickAlias::OnCancel, which would (at this point, it was unsetting GUESTED after introducing
 *     the new client) introduce the same new client again, without actually deleting the originial user, causing an infinite
 *     loop.
 *
 *     This is why we remove NS_GUESTED first in NickAlias::OnCancel before introducing a new client, although this should
 *     not happen anymore. If I must emphasize this again, users need to be GONE from the internal list before calling
 *     NickAlias::OnCancel. NickAlias::OnCancel intentionally reffers to this->nick, not the user passed to it. They *can*
 *     (but not always) be different, depending if the user changed nicks or disconnected.
 *
 *
 *  Adam
 */
void User::Collide(NickAlias *na)
{
	BotInfo *bi = findbot(Config->NickServ);
	if (!bi)
		return;
	if (na)
		na->SetFlag(NS_COLLIDED);

	if (ircd->svsnick)
	{
		Anope::string guestnick;

		int i = 0;
		do
		{
			guestnick = Config->NSGuestNickPrefix + stringify(getrandom16());
		} while (finduser(guestnick) && i++ < 10);

		if (i == 11)
			this->Kill(Config->NickServ, "Services nickname-enforcer kill");
		else
		{
			this->SendMessage(bi, _("Your nickname is now being changed to \002%s\002"), guestnick.c_str());
			ircdproto->SendForceNickChange(this, guestnick, Anope::CurTime);
		}
	}
	else
		this->Kill(Config->NickServ, "Services nickname-enforcer kill");
}

/** Identify the user to the Nick
 * updates last_seen, logs the user in,
 * send messages, checks for mails, set vhost and more
 * @param the NickAlias
 */
void User::Identify(NickAlias *na)
{
	if (!na)
	{
		Log() << "User::Identify() called with NULL pointer";
		return;
	}

	if (this->nick.equals_ci(na->nick))
	{
		Anope::string last_usermask = this->GetIdent() + "@" + this->GetDisplayedHost();
		Anope::string last_realhost = this->GetIdent() + "@" + this->host;
		na->last_usermask = last_usermask;
		na->last_realhost = last_realhost;
		na->last_realname = this->realname;
		na->last_seen = Anope::CurTime;
	}

	this->Login(na->nc);
	ircdproto->SendLogin(this);
	if (!Config->NoNicknameOwnership && na->nc == this->Account() && na->nc->HasFlag(NI_UNCONFIRMED) == false)
		this->SetMode(findbot(Config->NickServ), UMODE_REGISTERED);

	FOREACH_MOD(I_OnNickIdentify, OnNickIdentify(this));

	if (this->IsServicesOper())
	{
		BotInfo *bi = findbot(Config->OperServ);
		if (!this->nc->o->ot->modes.empty())
		{
			this->SetModes(bi, "%s", this->nc->o->ot->modes.c_str());
			if (bi != NULL)
				this->SendMessage(bi, "Changing your usermodes to \002%s\002", this->nc->o->ot->modes.c_str());
		}
		if (ircd->vhost && !this->nc->o->vhost.empty())
		{
			if (bi != NULL)
				this->SendMessage(bi, "Changing your vhost to \002%s\002", this->nc->o->vhost.c_str());
 			this->SetDisplayedHost(this->nc->o->vhost);
			ircdproto->SendVhost(this, "", this->nc->o->vhost);
		}
	}
}


/** Login the user to a NickCore
 * @param core The account the user is useing
 */
void User::Login(NickCore *core)
{
	this->Logout();
	this->nc = core;
	core->Users.push_back(this);

	this->UpdateHost();
}

/** Logout the user
 */
void User::Logout()
{
	if (!this->nc)
		return;

	std::list<User *>::iterator it = std::find(this->nc->Users.begin(), this->nc->Users.end(), this);
	if (it != this->nc->Users.end())
		this->nc->Users.erase(it);

	this->nc = NULL;
}

/** Get the account the user is logged in using
 * @reurn The account or NULL
 */
NickCore *User::Account()
{
	return this->nc;
}

/** Check if the user is identified for their nick
 * @param CheckNick True to check if the user is identified to the nickname they are on too
 * @return true or false
 */
bool User::IsIdentified(bool CheckNick)
{
	if (CheckNick && this->nc)
	{
		NickAlias *na = findnick(this->nc->display);

		if (na && na->nc == this->nc)
			return true;

		return false;
	}

	return this->nc ? true : false;
}

/** Check if the user is recognized for their nick (on the nicks access list)
 * @param CheckSecure Only returns true if the user has secure off
 * @return true or false
 */
bool User::IsRecognized(bool CheckSecure)
{
	if (CheckSecure && OnAccess)
	{
		NickAlias *na = findnick(this->nick);

		if (!na || na->nc->HasFlag(NI_SECURE))
			return false;
	}

	return OnAccess;
}

/** Check if the user is a services oper
 * @return true if they are an oper
 */
bool User::IsServicesOper()
{
	if (!this->nc || !this->nc->o)
		// No opertype.
		return false;
	else if (!this->nc->o->certfp.empty() && this->fingerprint != this->nc->o->certfp)
		// Certfp mismatch
		return false;
	else if (!this->nc->o->hosts.empty())
	{
		bool match = false;
		Anope::string match_host = this->GetIdent() + "@" + this->host;
		for (unsigned i = 0; i < this->nc->o->hosts.size(); ++i)
			if (Anope::Match(match_host, this->nc->o->hosts[i]))
				match = true;
		if (match == false)
			return false;
	}
	
	EventReturn MOD_RESULT;
	FOREACH_RESULT(I_IsServicesOper, IsServicesOper(this));
	if (MOD_RESULT == EVENT_STOP)
		return false;

	return true;
}

/** Check whether this user has access to run the given command string.
  * @param cmdstr The string to check, e.g. botserv/set/private.
  * @return True if this user may run the specified command, false otherwise.
  */
bool User::HasCommand(const Anope::string &command)
{
	if (this->IsServicesOper())
		return this->nc->o->ot->HasCommand(command);
	return false;
}

/** Check whether this user has access to the given special permission.
  * @param privstr The priv to check for, e.g. users/auspex.
  * @return True if this user has the specified priv, false otherwise.
  */
bool User::HasPriv(const Anope::string &priv)
{
	if (this->IsServicesOper())
		return this->nc->o->ot->HasPriv(priv);
	return false;
}

/** Update the last usermask stored for a user, and check to see if they are recognized
 */
void User::UpdateHost()
{
	if (this->host.empty())
		return;

	NickAlias *na = findnick(this->nick);
	OnAccess = false;
	if (na)
		OnAccess = is_on_access(this, na->nc);

	if (na && (this->IsIdentified(true) || this->IsRecognized()))
	{
		Anope::string last_usermask = this->GetIdent() + "@" + this->GetDisplayedHost();
		Anope::string last_realhost = this->GetIdent() + "@" + this->host;
		na->last_usermask = last_usermask;
		na->last_realhost = last_realhost;
	}
}

/** Check if the user has a mode
 * @param Name Mode name
 * @return true or false
 */
bool User::HasMode(UserModeName Name) const
{
	return this->modes.HasFlag(Name);
}

/** Set a mode internally on the user, the IRCd is not informed
 * @param um The user mode
 * @param Param The param, if there is one
 */
void User::SetModeInternal(UserMode *um, const Anope::string &Param)
{
	if (!um)
		return;

	this->modes.SetFlag(um->Name);
	if (!Param.empty())
		Params.insert(std::make_pair(um->Name, Param));

	FOREACH_MOD(I_OnUserModeSet, OnUserModeSet(this, um->Name));
}

/** Remove a mode internally on the user, the IRCd is not informed
 * @param um The user mode
 */
void User::RemoveModeInternal(UserMode *um)
{
	if (!um)
		return;

	this->modes.UnsetFlag(um->Name);
	std::map<UserModeName, Anope::string>::iterator it = Params.find(um->Name);
	if (it != Params.end())
		Params.erase(it);

	FOREACH_MOD(I_OnUserModeUnset, OnUserModeUnset(this, um->Name));
}

/** Set a mode on the user
 * @param bi The client setting the mode
 * @param um The user mode
 * @param Param Optional param for the mode
 */
void User::SetMode(BotInfo *bi, UserMode *um, const Anope::string &Param)
{
	if (!um || HasMode(um->Name))
		return;

	ModeManager::StackerAdd(bi, this, um, true, Param);
	SetModeInternal(um, Param);
}

/** Set a mode on the user
 * @param bi The client setting the mode
 * @param Name The mode name
 * @param param Optional param for the mode
 */
void User::SetMode(BotInfo *bi, UserModeName Name, const Anope::string &Param)
{
	SetMode(bi, ModeManager::FindUserModeByName(Name), Param);
}

/** Remove a mode on the user
 * @param bi The client setting the mode
 * @param um The user mode
 */
void User::RemoveMode(BotInfo *bi, UserMode *um)
{
	if (!um || !HasMode(um->Name))
		return;

	ModeManager::StackerAdd(bi, this, um, false);
	RemoveModeInternal(um);
}

/** Remove a mode from the user
 * @param bi The client setting the mode
 * @param Name The mode name
 */
void User::RemoveMode(BotInfo *bi, UserModeName Name)
{
	RemoveMode(bi, ModeManager::FindUserModeByName(Name));
}

/** Set a string of modes on a user
 * @param bi The client setting the mode
 * @param umodes The modes
 */
void User::SetModes(BotInfo *bi, const char *umodes, ...)
{
	char buf[BUFSIZE] = "";
	va_list args;
	Anope::string modebuf, sbuf;
	int add = -1;
	va_start(args, umodes);
	vsnprintf(buf, BUFSIZE - 1, umodes, args);
	va_end(args);

	spacesepstream sep(buf);
	sep.GetToken(modebuf);
	for (unsigned i = 0, end = modebuf.length(); i < end; ++i)
	{
		UserMode *um;

		switch (modebuf[i])
		{
			case '+':
				add = 1;
				continue;
			case '-':
				add = 0;
				continue;
			default:
				if (add == -1)
					continue;
				um = ModeManager::FindUserModeByChar(modebuf[i]);
				if (!um)
					continue;
		}

		if (add)
		{
			if (um->Type == MODE_PARAM && sep.GetToken(sbuf))
				this->SetMode(bi, um, sbuf);
			else
				this->SetMode(bi, um);
		}
		else
			this->RemoveMode(bi, um);
	}
}

void User::SetModesInternal(const char *umodes, ...)
{
	char buf[BUFSIZE] = "";
	va_list args;
	Anope::string modebuf, sbuf;
	int add = -1;
	va_start(args, umodes);
	vsnprintf(buf, BUFSIZE - 1, umodes, args);
	va_end(args);

	spacesepstream sep(buf);
	sep.GetToken(modebuf);
	for (unsigned i = 0, end = modebuf.length(); i < end; ++i)
	{
		UserMode *um;

		switch (modebuf[i])
		{
			case '+':
				add = 1;
				continue;
			case '-':
				add = 0;
				continue;
			default:
				if (add == -1)
					continue;
				um = ModeManager::FindUserModeByChar(modebuf[i]);
				if (!um)
					continue;
		}

		if (add)
		{
			if (um->Type == MODE_PARAM && sep.GetToken(sbuf))
				this->SetModeInternal(um, sbuf);
			else
				this->SetModeInternal(um);
		}
		else
			this->RemoveModeInternal(um);

		switch (um->Name)
		{
			case UMODE_OPER:
				if (add)
					++opcnt;
				else
					--opcnt;
				break;
			case UMODE_CLOAK:
			case UMODE_VHOST:
				if (!add && !this->vhost.empty())
					this->vhost.clear();
				this->UpdateHost();
			default:
				break;
		}
	}
}

Anope::string User::GetModes() const
{
	Anope::string ret;

	for (size_t i = UMODE_BEGIN + 1; i < UMODE_END; ++i)
		if (this->modes.HasFlag(static_cast<UserModeName>(i)))
		{
			UserMode *um = ModeManager::FindUserModeByName(static_cast<UserModeName>(i));
			if (um == NULL)
				continue;
			ret += um->ModeChar;
		}

	return ret;
}

/** Find the channel container for Channel c that the user is on
 * This is preferred over using FindUser in Channel, as there are usually more users in a channel
 * than channels a user is in
 * @param c The channel
 * @return The channel container, or NULL
 */
ChannelContainer *User::FindChannel(const Channel *c)
{
	for (UChannelList::const_iterator it = this->chans.begin(), it_end = this->chans.end(); it != it_end; ++it)
		if ((*it)->chan == c)
			return *it;
	return NULL;
}

/** Check if the user is protected from kicks and negative mode changes
 * @return true or false
 */
bool User::IsProtected() const
{
	if (this->HasMode(UMODE_PROTECTED) || this->HasMode(UMODE_GOD))
		return true;

	return false;
}

void User::Kill(const Anope::string &source, const Anope::string &reason)
{
	Anope::string real_source = source.empty() ? Config->ServerName : source;
	Anope::string real_reason = real_source + " (" + reason + ")";

	ircdproto->SendSVSKill(findbot(source), this, "%s", real_reason.c_str());

	if (!ircd->quitonkill)
		do_kill(this, real_reason);
}

User *finduser(const Anope::string &nick)
{
	if (isdigit(nick[0]) && ircd->ts6)
	{
		Anope::map<User *>::iterator it = UserListByUID.find(nick);
		if (it != UserListByUID.end())
			return it->second;
	}
	else
	{
		Anope::insensitive_map<User *>::iterator it = UserListByNick.find(nick);
		if (it != UserListByNick.end())
			return it->second;
	}

	return NULL;
}

/*************************************************************************/

/* Handle a server NICK command. */

User *do_nick(const Anope::string &source, const Anope::string &nick, const Anope::string &username, const Anope::string &host, const Anope::string &server, const Anope::string &realname, time_t ts, const Anope::string &ip, const Anope::string &vhost, const Anope::string &uid, const Anope::string &modes)
{
	if (source.empty())
	{
		Server *serv = Server::Find(server);
		if (serv == NULL)
		{
			Log() << "User " << nick << " introduced with nonexistant server " << server << "!";
			return NULL;
		}

		/* Allocate User structure and fill it in. */
		dynamic_reference<User> user = new User(nick, username, host, uid);
		user->server = serv;
		user->realname = realname;
		user->timestamp = ts;
		if (!vhost.empty())
			user->SetCloakedHost(vhost);
		user->SetVIdent(username);
		user->SetModesInternal(modes.c_str());

		if (!ip.empty())
		{
			try
			{
				if (ip.find(':') != Anope::string::npos)
					user->ip.pton(AF_INET6, ip);
				else
					user->ip.pton(AF_INET, ip);
			}
			catch (const SocketException &ex)
			{
				Log() << "Received an invalid IP for user " << user->nick << " (" << ip << ")";
				Log() << ex.GetReason();
			}
		}

		Log(user, "connect") << (!vhost.empty() ? Anope::string("(") + vhost + ")" : "") << " (" << user->realname << ") " << (user->ip() ? Anope::string("[") + user->ip.addr() + "] " : "") << "connected to the network (" << serv->GetName() << ")";

		bool exempt = false;
		if (user->server && user->server->IsULined())
			exempt = true;
		FOREACH_MOD(I_OnUserConnect, OnUserConnect(user, exempt));
		
		return user;
	}
	else
	{
		/* An old user changing nicks. */
		User *user = finduser(source);

		if (!user)
		{
			Log() << "user: NICK from nonexistent nick " << source;
			return NULL;
		}
		user->SuperAdmin = false;

		Log(user, "nick") << "(" << user->realname << ") changed nick to " << nick;

		user->timestamp = ts;

		if (user->nick.equals_ci(nick))
			/* No need to redo things */
			user->SetNewNick(nick);
		else
		{
			/* Update this only if nicks aren't the same */
			user->my_signon = Anope::CurTime;

			NickAlias *old_na = findnick(user->nick);
			if (old_na && (old_na->nc == user->Account() || user->IsRecognized()))
				old_na->last_seen = Anope::CurTime;

			Anope::string oldnick = user->nick;
			user->SetNewNick(nick);
			FOREACH_MOD(I_OnUserNickChange, OnUserNickChange(user, oldnick));

			if (old_na)
				old_na->OnCancel(user);

			NickAlias *na = findnick(user->nick);
			if (na && na->nc == user->Account())
			{
				na->last_seen = Anope::CurTime;
				user->UpdateHost();
			}
		}

		return user;
	}
}

/*************************************************************************/

void do_umode(const Anope::string &user, const Anope::string &modes)
{
	User *u = finduser(user);
	if (!u)
	{
		Log() << "user: MODE "<< modes << " for nonexistent nick "<< user;
		return;
	}

	Log(u, "mode") << "changes modes to " << modes;

	u->SetModesInternal(modes.c_str());
}

/*************************************************************************/


/* Handle a KILL command.
 * @param user the user being killed
 * @param msg why
 */
void do_kill(User *user, const Anope::string &msg)
{
	Log(user, "killed") << "was killed (Reason: " << msg << ")";

	NickAlias *na = findnick(user->nick);
	if (na && !na->nc->HasFlag(NI_SUSPENDED) && (user->IsRecognized() || user->IsIdentified(true)))
	{
		na->last_seen = Anope::CurTime;
		na->last_quit = msg;
	}
	delete user;
}

/*************************************************************************/
/*************************************************************************/

bool matches_list(Channel *c, User *user, ChannelModeName mode)
{
	if (!c || !c->HasMode(mode))
		return false;


	std::pair<Channel::ModeList::iterator, Channel::ModeList::iterator> modes = c->GetModeList(mode);
	for (; modes.first != modes.second; ++modes.first)
	{
		Entry e(mode, modes.first->second);
		if (e.Matches(user))
			return true;
	}

	return false;
}

/*************************************************************************/

/* Given a user, return a mask that will most likely match any address the
 * user will have from that location.  For IP addresses, wildcards the
 * appropriate subnet mask (e.g. 35.1.1.1 -> 35.*; 128.2.1.1 -> 128.2.*);
 * for named addresses, wildcards the leftmost part of the name unless the
 * name only contains two parts.  If the username begins with a ~, delete
 * it.
 */

Anope::string create_mask(User *u)
{
	Anope::string mask;
	Anope::string mident = u->GetIdent();
	Anope::string mhost = u->GetDisplayedHost();

	/* Get us a buffer the size of the username plus hostname.  The result
	 * will never be longer than this (and will often be shorter), thus we
	 * can use strcpy() and sprintf() safely.
	 */
	if (mident[0] == '~')
		mask = "*" + mident + "@";
	else
		mask = mident + "@";

	size_t dot;
	/* To make sure this is an IP, make sure the host contains only numbers and dots, and check to make sure it only contains 3 dots */
	if (mhost.find_first_not_of("0123456789.") == Anope::string::npos && (dot = mhost.find('.')) != Anope::string::npos && (dot = mhost.find('.', dot + 1)) != Anope::string::npos && (dot = mhost.find('.', dot + 1)) != Anope::string::npos && mhost.find('.', dot + 1) == Anope::string::npos)
	{ /* IP addr */
		dot = mhost.find('.');
		mask += mhost.substr(0, dot) + ".*";
	}
	else
	{
		if ((dot = mhost.find('.')) != Anope::string::npos && mhost.find('.', dot + 1) != Anope::string::npos)
			mask += "*" + mhost.substr(dot);
		else
			mask += mhost;
	}
	return mask;
}