/* Charybdis IRCD functions
  *
  * (C) 2003-2022 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 "module.h"
 #include "modules/cs_mode.h"
 #include "modules/sasl.h"
 
 static Anope::string UplinkSID;
 
 static ServiceReference<IRCDProto> ratbox("IRCDProto", "ratbox");
 
 class ChannelModeLargeBan : public ChannelMode
 {
  public:
 	ChannelModeLargeBan(const Anope::string &mname, char modeChar) : ChannelMode(mname, modeChar) { }
 
 	bool CanSet(User *u) const anope_override
 	{
 		return u && u->HasMode("OPER");
 	}
 };
 
 
 class CharybdisProto : public IRCDProto
 {
  public:
 
 	CharybdisProto(Module *creator) : IRCDProto(creator, "Charybdis 3.4+")
 	{
 		DefaultPseudoclientModes = "+oiS";
 		CanCertFP = true;
 		CanSNLine = true;
 		CanSQLine = true;
 		CanSQLineChannel = true;
 		CanSZLine = true;
 		CanSVSNick = true;
 		CanSVSHold = true;
 		CanSetVHost = true;
 		RequiresID = true;
 		MaxModes = 4;
 	}
 
 	void SendSVSKillInternal(const MessageSource &source, User *targ, const Anope::string &reason) anope_override { ratbox->SendSVSKillInternal(source, targ, reason); }
 	void SendGlobalNotice(BotInfo *bi, const Server *dest, const Anope::string &msg) anope_override { ratbox->SendGlobalNotice(bi, dest, msg); }
 	void SendGlobalPrivmsg(BotInfo *bi, const Server *dest, const Anope::string &msg) anope_override { ratbox->SendGlobalPrivmsg(bi, dest, msg); }
 	void SendGlobopsInternal(const MessageSource &source, const Anope::string &buf) anope_override { ratbox->SendGlobopsInternal(source, buf); }
 	void SendSGLine(User *u, const XLine *x) anope_override { ratbox->SendSGLine(u, x); }
 	void SendSGLineDel(const XLine *x) anope_override { ratbox->SendSGLineDel(x); }
 	void SendAkill(User *u, XLine *x) anope_override { ratbox->SendAkill(u, x); }
 	void SendAkillDel(const XLine *x) anope_override { ratbox->SendAkillDel(x); }
 	void SendSQLine(User *u, const XLine *x) anope_override { ratbox->SendSQLine(u, x); }
 	void SendSQLineDel(const XLine *x) anope_override { ratbox->SendSQLineDel(x); }
 	void SendJoin(User *user, Channel *c, const ChannelStatus *status) anope_override { ratbox->SendJoin(user, c, status); }
 	void SendServer(const Server *server) anope_override { ratbox->SendServer(server); }
 	void SendChannel(Channel *c) anope_override { ratbox->SendChannel(c); }
 	void SendTopic(const MessageSource &source, Channel *c) anope_override { ratbox->SendTopic(source, c); }
 	bool IsIdentValid(const Anope::string &ident) anope_override { return ratbox->IsIdentValid(ident); }
 	void SendLogin(User *u, NickAlias *na) anope_override { ratbox->SendLogin(u, na); }
 	void SendLogout(User *u) anope_override { ratbox->SendLogout(u); }
 
 	void SendSASLMechanisms(std::vector<Anope::string> &mechanisms) anope_override
 	{
 		Anope::string mechlist;
 
 		for (unsigned i = 0; i < mechanisms.size(); ++i)
 		{
 			mechlist += "," + mechanisms[i];
 		}
 
 		UplinkSocket::Message(Me) << "ENCAP * MECHLIST :" << (mechanisms.empty() ? "" : mechlist.substr(1));
 	}
 
 	void SendConnect() anope_override
 	{
 		UplinkSocket::Message() << "PASS " << Config->Uplinks[Anope::CurrentUplink].password << " TS 6 :" << Me->GetSID();
 		/*
 		 * Received: CAPAB :BAN CHW CLUSTER ENCAP EOPMOD EUID EX IE KLN
 		 *           KNOCK MLOCK QS RSFNC SAVE SERVICES TB UNKLN
 		 *
 		 * BAN      - Can do BAN message
 		 * CHW      - Can do channel wall @#
 		 * CLUSTER  - Supports umode +l, can send LOCOPS (encap only)
 		 * ENCAP    - Can do ENCAP message
 		 * EOPMOD   - Can do channel wall =# (for cmode +z)
 		 * EUID     - Can do EUID (its similar to UID but includes the ENCAP REALHOST and ENCAP LOGIN information)
 		 * EX       - Can do channel +e exemptions
 		 * GLN      - Can set G:Lines
 		 * IE       - Can do invite exceptions
 		 * KLN      - Can set K:Lines (encap only)
 		 * KNOCK    - Supports KNOCK
 		 * MLOCK    - Supports MLOCK
 		 * RSFNC    - Forces a nickname change and propagates it (encap only)
 		 * SERVICES - Support channel mode +r (only registered users may join)
 		 * SAVE     - Resolve a nick collision by changing a nickname to the UID.
 		 * TB       - Supports topic burst
 		 * UNKLN    - Can do UNKLINE (encap only)
 		 * QS       - Can handle quit storm removal
 		*/
 		UplinkSocket::Message() << "CAPAB :BAN CHW CLUSTER ENCAP EOPMOD EUID EX IE KLN KNOCK MLOCK QS RSFNC SERVICES TB UNKLN";
 
 		/* Make myself known to myself in the serverlist */
 		SendServer(Me);
 
 		/*
 		 * Received: SVINFO 6 6 0 :1353235537
 		 *  arg[0] = current TS version
 		 *  arg[1] = minimum required TS version
 		 *  arg[2] = '0'
 		 *  arg[3] = server's idea of UTC time
 		 */
 		UplinkSocket::Message() << "SVINFO 6 6 0 :" << Anope::CurTime;
 	}
 
 	void SendClientIntroduction(User *u) anope_override
 	{
 		Anope::string modes = "+" + u->GetModes();
 		UplinkSocket::Message(Me) << "EUID " << u->nick << " 1 " << u->timestamp << " " << modes << " " << u->GetIdent() << " " << u->host << " 0 " << u->GetUID() << " * * :" << u->realname;
 	}
 
 	void SendForceNickChange(User *u, const Anope::string &newnick, time_t when) anope_override
 	{
 		UplinkSocket::Message(Me) << "ENCAP " << u->server->GetName() << " RSFNC " << u->GetUID()
 						<< " " << newnick << " " << when << " " << u->timestamp;
 	}
 
 	void SendSVSHold(const Anope::string &nick, time_t delay) anope_override
 	{
 		UplinkSocket::Message(Me) << "ENCAP * NICKDELAY " << delay << " " << nick;
 	}
 
 	void SendSVSHoldDel(const Anope::string &nick) anope_override
 	{
 		UplinkSocket::Message(Me) << "ENCAP * NICKDELAY 0 " << nick;
 	}
 
 	void SendVhost(User *u, const Anope::string &ident, const Anope::string &host) anope_override
 	{
 		UplinkSocket::Message(Me) << "ENCAP * CHGHOST " << u->GetUID() << " :" << host;
 	}
 
 	void SendVhostDel(User *u) anope_override
 	{
 		this->SendVhost(u, "", u->host);
 	}
 
 	void SendSASLMessage(const SASL::Message &message) anope_override
 	{
 		Server *s = Server::Find(message.target.substr(0, 3));
 		UplinkSocket::Message(Me) << "ENCAP " << (s ? s->GetName() : message.target.substr(0, 3)) << " SASL " << message.source << " " << message.target << " " << message.type << " " << message.data << (message.ext.empty() ? "" : (" " + message.ext));
 	}
 
 	void SendSVSLogin(const Anope::string &uid, const Anope::string &acc, const Anope::string &vident, const Anope::string &vhost) anope_override
 	{
 		Server *s = Server::Find(uid.substr(0, 3));
 		UplinkSocket::Message(Me) << "ENCAP " << (s ? s->GetName() : uid.substr(0, 3)) << " SVSLOGIN " << uid << " * " << (!vident.empty() ? vident : '*') << " " << (!vhost.empty() ? vhost : '*') << " " << acc;
 	}
 };
 
 
 struct IRCDMessageEncap : IRCDMessage
 {
 	IRCDMessageEncap(Module *creator) : IRCDMessage(creator, "ENCAP", 3)
 	{
 		SetFlag(IRCDMESSAGE_SOFT_LIMIT);
 	}
 
 	void Run(MessageSource &source, const std::vector<Anope::string> &params) anope_override
 	{
 		// In a burst, states that the source user is logged in as the account.
 		if (params[1] == "LOGIN" || params[1] == "SU")
 		{
 			User *u = source.GetUser();
 			NickCore *nc = NickCore::Find(params[2]);
 
 			if (!u || !nc)
 				return;
 
 			u->Login(nc);
 		}
 		// Received: :42XAAAAAE ENCAP * CERTFP :3f122a9cc7811dbad3566bf2cec3009007c0868f
 		else if (params[1] == "CERTFP")
 		{
 			User *u = source.GetUser();
 			if (!u)
 				return;
 
 			u->fingerprint = params[2];
 
 			FOREACH_MOD(OnFingerprint, (u));
 		}
 		/*
 		 * Received: :42X ENCAP * SASL 42XAAAAAH * S PLAIN
 		 * Received: :42X ENCAP * SASL 42XAAAAAC * D A
 		 *
 		 * Part of a SASL authentication exchange. The mode is 'C' to send some data
 		 * (base64 encoded), or 'S' to end the exchange (data indicates type of
 		 * termination: 'A' for abort, 'F' for authentication failure, 'S' for
 		 * authentication success).
 		 *
 		 * Charybdis only accepts messages from SASL agents; these must have umode +S
 		 */
 		else if (params[1] == "SASL" && SASL::sasl && params.size() >= 6)
 		{
 			SASL::Message m;
 			m.source = params[2];
 			m.target = params[3];
 			m.type = params[4];
 			m.data = params[5];
 			m.ext = params.size() > 6 ? params[6] : "";
 
 			SASL::sasl->ProcessMessage(m);
 		}
 	}
 };
 
 struct IRCDMessageEUID : IRCDMessage
 {
 	IRCDMessageEUID(Module *creator) : IRCDMessage(creator, "EUID", 11) { SetFlag(IRCDMESSAGE_REQUIRE_SERVER); }
 
 	/*
 	 * :42X EUID DukePyrolator 1 1353240577 +Zi ~jens erft-5d80b00b.pool.mediaWays.net 93.128.176.11 42XAAAAAD * * :jens
 	 * :<SID> EUID <NICK> <HOPS> <TS> +<UMODE> <USERNAME> <VHOST> <IP> <UID> <REALHOST> <ACCOUNT> :<GECOS>
 	 *               0      1     2      3         4         5     6     7       8         9         10
 	 *
 	 * Introduces a user. The hostname field is now always the visible host.
 	 * The realhost field is * if the real host is equal to the visible host.
 	 * The account field is * if the login is not set.
 	 * Note that even if both new fields are *, an EUID command still carries more
 	 * information than a UID command (namely that real host is visible host and the
 	 * user is not logged in with services). Hence a NICK or UID command received
 	 * from a remote server should not be sent in EUID form to other servers.
 	 */
 	void Run(MessageSource &source, const std::vector<Anope::string> &params) anope_override
 	{
 		NickAlias *na = NULL;
 		if (params[9] != "*")
 			na = NickAlias::Find(params[9]);
 
 		User::OnIntroduce(params[0], params[4], (params[8] != "*" ? params[8] : params[5]), params[5], params[6], source.GetServer(), params[10], params[2].is_pos_number_only() ? convertTo<time_t>(params[2]) : Anope::CurTime, params[3], params[7], na ? *na->nc : NULL);
 	}
 };
 
 // we can't use this function from ratbox because we set a local variable here
 struct IRCDMessageServer : IRCDMessage
 {
 	IRCDMessageServer(Module *creator) : IRCDMessage(creator, "SERVER", 3) { SetFlag(IRCDMESSAGE_REQUIRE_SERVER); }
 
 	// SERVER dev.anope.de 1 :charybdis test server
 	void Run(MessageSource &source, const std::vector<Anope::string> &params) anope_override
 	{
 		// Servers other then our immediate uplink are introduced via SID
 		if (params[1] != "1")
 			return;
 		new Server(source.GetServer() == NULL ? Me : source.GetServer(), params[0], 1, params[2], UplinkSID);
 		IRCD->SendPing(Me->GetName(), params[0]);
 	}
 };
 
 // we can't use this function from ratbox because we set a local variable here
 struct IRCDMessagePass : IRCDMessage
 {
 	IRCDMessagePass(Module *creator) : IRCDMessage(creator, "PASS", 4) { SetFlag(IRCDMESSAGE_REQUIRE_SERVER); }
 
 	void Run(MessageSource &source, const std::vector<Anope::string> &params) anope_override
 	{
 		// UplinkSID is used in IRCDMessageServer
 		UplinkSID = params[3];
 	}
 };
 
 class ProtoCharybdis : public Module
 {
 	Module *m_ratbox;
 
 	CharybdisProto ircd_proto;
 
 	/* Core message handlers */
 	Message::Away message_away;
 	Message::Capab message_capab;
 	Message::Error message_error;
 	Message::Invite message_invite;
 	Message::Kick message_kick;
 	Message::Kill message_kill;
 	Message::Mode message_mode;
 	Message::MOTD message_motd;
 	Message::Notice message_notice;
 	Message::Part message_part;
 	Message::Ping message_ping;
 	Message::Privmsg message_privmsg;
 	Message::Quit message_quit;
 	Message::SQuit message_squit;
 	Message::Stats message_stats;
 	Message::Time message_time;
 	Message::Topic message_topic;
 	Message::Version message_version;
 	Message::Whois message_whois;
 
 	/* Ratbox Message Handlers */
 	ServiceAlias message_bmask, message_join, message_nick, message_pong, message_sid, message_sjoin,
 		message_tb, message_tmode, message_uid;
 
 	/* Our message handlers */
 	IRCDMessageEncap message_encap;
 	IRCDMessageEUID message_euid;
 	IRCDMessagePass message_pass;
 	IRCDMessageServer message_server;
 
 	bool use_server_side_mlock;
 
 	void AddModes()
 	{
 		/* Add user modes */
 		ModeManager::AddUserMode(new UserMode("NOFORWARD", 'Q'));
 		ModeManager::AddUserMode(new UserMode("REGPRIV", 'R'));
 		ModeManager::AddUserMode(new UserModeOperOnly("OPERWALLS", 'z'));
 		ModeManager::AddUserMode(new UserModeNoone("SSL", 'Z'));
 
 		/* b/e/I */
 		ModeManager::AddChannelMode(new ChannelModeList("QUIET", 'q'));
 
 		/* Add channel modes */
 		ModeManager::AddChannelMode(new ChannelMode("BLOCKCOLOR", 'c'));
 		ModeManager::AddChannelMode(new ChannelMode("NOCTCP", 'C'));
 		ModeManager::AddChannelMode(new ChannelModeParam("REDIRECT", 'f'));
 		ModeManager::AddChannelMode(new ChannelMode("ALLOWFORWARD", 'F'));
 		ModeManager::AddChannelMode(new ChannelMode("ALLINVITE", 'g'));
 		ModeManager::AddChannelMode(new ChannelModeParam("JOINFLOOD", 'j'));
 		ModeManager::AddChannelMode(new ChannelModeLargeBan("LBAN", 'L'));
 		ModeManager::AddChannelMode(new ChannelMode("PERM", 'P'));
 		ModeManager::AddChannelMode(new ChannelMode("NOFORWARD", 'Q'));
 		ModeManager::AddChannelMode(new ChannelMode("OPMODERATED", 'z'));
 	}
 
  public:
 	ProtoCharybdis(const Anope::string &modname, const Anope::string &creator) : Module(modname, creator, PROTOCOL | VENDOR),
 		ircd_proto(this),
 		message_away(this), message_capab(this), message_error(this), message_invite(this), message_kick(this),
 		message_kill(this), message_mode(this), message_motd(this), message_notice(this), message_part(this),
 		message_ping(this), message_privmsg(this), message_quit(this), message_squit(this), message_stats(this),
 		message_time(this), message_topic(this), message_version(this), message_whois(this),
 
 		message_bmask("IRCDMessage", "charybdis/bmask", "ratbox/bmask"),
 		message_join("IRCDMessage", "charybdis/join", "ratbox/join"),
 		message_nick("IRCDMessage", "charybdis/nick", "ratbox/nick"),
 		message_pong("IRCDMessage", "charybdis/pong", "ratbox/pong"),
 		message_sid("IRCDMessage", "charybdis/sid", "ratbox/sid"),
 		message_sjoin("IRCDMessage", "charybdis/sjoin", "ratbox/sjoin"),
 		message_tb("IRCDMessage", "charybdis/tb", "ratbox/tb"),
 		message_tmode("IRCDMessage", "charybdis/tmode", "ratbox/tmode"),
 		message_uid("IRCDMessage", "charybdis/uid", "ratbox/uid"),
 
 		message_encap(this), message_euid(this), message_pass(this), message_server(this)
 
 	{
 
 
 		if (ModuleManager::LoadModule("ratbox", User::Find(creator)) != MOD_ERR_OK)
 			throw ModuleException("Unable to load ratbox");
 		m_ratbox = ModuleManager::FindModule("ratbox");
 		if (!m_ratbox)
 			throw ModuleException("Unable to find ratbox");
 		if (!ratbox)
 			throw ModuleException("No protocol interface for ratbox");
 
 		this->AddModes();
 	}
 
 	~ProtoCharybdis()
 	{
 		m_ratbox = ModuleManager::FindModule("ratbox");
 		ModuleManager::UnloadModule(m_ratbox, NULL);
 	}
 
 	void OnReload(Configuration::Conf *conf) anope_override
 	{
 		use_server_side_mlock = conf->GetModule(this)->Get<bool>("use_server_side_mlock");
 	}
 
 	void OnChannelSync(Channel *c) anope_override
 	{
 		if (!c->ci)
 			return;
 
 		ModeLocks *modelocks = c->ci->GetExt<ModeLocks>("modelocks");
 		if (use_server_side_mlock && modelocks && Servers::Capab.count("MLOCK") > 0)
 		{
 			Anope::string modes = modelocks->GetMLockAsString(false).replace_all_cs("+", "").replace_all_cs("-", "");
 			UplinkSocket::Message(Me) << "MLOCK " << static_cast<long>(c->creation_time) << " " << c->ci->name << " " << modes;
 		}
 	}
 
 	EventReturn OnMLock(ChannelInfo *ci, ModeLock *lock) anope_override
 	{
 		ModeLocks *modelocks = ci->GetExt<ModeLocks>("modelocks");
 		ChannelMode *cm = ModeManager::FindChannelModeByName(lock->name);
 		if (use_server_side_mlock && cm && ci->c && modelocks && (cm->type == MODE_REGULAR || cm->type == MODE_PARAM) && Servers::Capab.count("MLOCK") > 0)
 		{
 			Anope::string modes = modelocks->GetMLockAsString(false).replace_all_cs("+", "").replace_all_cs("-", "") + cm->mchar;
 			UplinkSocket::Message(Me) << "MLOCK " << static_cast<long>(ci->c->creation_time) << " " << ci->name << " " << modes;
 		}
 
 		return EVENT_CONTINUE;
 	}
 
 	EventReturn OnUnMLock(ChannelInfo *ci, ModeLock *lock) anope_override
 	{
 		ModeLocks *modelocks = ci->GetExt<ModeLocks>("modelocks");
 		ChannelMode *cm = ModeManager::FindChannelModeByName(lock->name);
 		if (use_server_side_mlock && cm && modelocks && ci->c && (cm->type == MODE_REGULAR || cm->type == MODE_PARAM) && Servers::Capab.count("MLOCK") > 0)
 		{
 			Anope::string modes = modelocks->GetMLockAsString(false).replace_all_cs("+", "").replace_all_cs("-", "").replace_all_cs(cm->mchar, "");
 			UplinkSocket::Message(Me) << "MLOCK " << static_cast<long>(ci->c->creation_time) << " " << ci->name << " " << modes;
 		}
 
 		return EVENT_CONTINUE;
 	}
 };
 
 MODULE_INIT(ProtoCharybdis)

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