Attempt to revert r11734

git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@11735 e03df62e-2008-0410-955e-edbf42e46eb7

1 files changed, 214 insertions, 0 deletions

diff --git a/src/commands/cmd_nick.cpp b/src/commands/cmd_nick.cpp
new file mode 100644
index 000000000..99b8348ab
--- /dev/null
+++ b/src/commands/cmd_nick.cpp
@@ -0,0 +1,214 @@
+/*       +------------------------------------+
+ *       | Inspire Internet Relay Chat Daemon |
+ *       +------------------------------------+
+ *
+ *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
+ * See: http://wiki.inspircd.org/Credits
+ *
+ * This program is free but copyrighted software; see
+ *            the file COPYING for details.
+ *
+ * ---------------------------------------------------
+ */
+
+#include "inspircd.h"
+#include "xline.h"
+
+/** Handle /NICK. These command handlers can be reloaded by the core,
+ * and handle basic RFC1459 commands. Commands within modules work
+ * the same way, however, they can be fully unloaded, where these
+ * may not.
+ */
+class CommandNick : public Command
+{
+ public:
+	/** Constructor for nick.
+	 */
+	CommandNick ( Module* parent) : Command(parent,"NICK", 1, 1) { works_before_reg = true; syntax = "<newnick>"; Penalty = 3; }
+	/** Handle command.
+	 * @param parameters The parameters to the comamnd
+	 * @param pcnt The number of parameters passed to teh command
+	 * @param user The user issuing the command
+	 * @return A value from CmdResult to indicate command success or failure.
+	 */
+	CmdResult Handle(const std::vector<std::string>& parameters, User *user);
+};
+
+/** Handle nick changes from users.
+ * NOTE: If you are used to ircds based on ircd2.8, and are looking
+ * for the client introduction code in here, youre in the wrong place.
+ * You need to look in the spanningtree module for this!
+ */
+CmdResult CommandNick::Handle (const std::vector<std::string>& parameters, User *user)
+{
+	std::string oldnick;
+
+	if (parameters[0].empty())
+	{
+		/* We cant put blanks in the parameters, so for this (extremely rare) issue we just put '*' here. */
+		user->WriteNumeric(432, "%s * :Erroneous Nickname", user->nick.empty() ? user->nick.c_str() : "*");
+		return CMD_FAILURE;
+	}
+
+	if (((!ServerInstance->IsNick(parameters[0].c_str(), ServerInstance->Config->Limits.NickMax))) && (IS_LOCAL(user)))
+	{
+		if (!User::NICKForced.get(user))
+		{
+			if (parameters[0] == "0")
+			{
+				// Special case, Fake a /nick UIDHERE. Useful for evading "ERR: NICK IN USE" on connect etc.
+				std::vector<std::string> p2;
+				p2.push_back(user->uuid);
+				User::NICKForced.set(user, 1);
+				this->Handle(p2, user);
+				User::NICKForced.set(user, 0);
+				return CMD_SUCCESS;
+			}
+
+			user->WriteNumeric(432, "%s %s :Erroneous Nickname", user->nick.c_str(),parameters[0].c_str());
+			return CMD_FAILURE;
+		}
+	}
+
+	if (assign(user->nick) == parameters[0])
+	{
+		/* If its exactly the same, even case, dont do anything. */
+		if (parameters[0] == user->nick)
+		{
+			return CMD_SUCCESS;
+		}
+
+		/* Its a change of case. People insisted that they should be
+		 * able to do silly things like this even though the RFC says
+		 * the nick AAA is the same as the nick aaa.
+		 */
+		oldnick.assign(user->nick, 0, IS_LOCAL(user) ? ServerInstance->Config->Limits.NickMax : MAXBUF);
+		ModResult MOD_RESULT;
+		FIRST_MOD_RESULT(ServerInstance, OnUserPreNick, MOD_RESULT, (user,parameters[0]));
+		if (MOD_RESULT == MOD_RES_DENY)
+			return CMD_FAILURE;
+		if (user->registered == REG_ALL)
+			user->WriteCommon("NICK %s",parameters[0].c_str());
+		user->nick.assign(parameters[0], 0, IS_LOCAL(user) ? ServerInstance->Config->Limits.NickMax : MAXBUF);
+		user->InvalidateCache();
+		FOREACH_MOD(I_OnUserPostNick,OnUserPostNick(user,oldnick));
+		return CMD_SUCCESS;
+	}
+	else
+	{
+		/*
+		 * Don't check Q:Lines if it's a server-enforced change, just on the off-chance some fucking *moron*
+		 * tries to Q:Line SIDs, also, this means we just get our way period, as it really should be.
+		 * Thanks Kein for finding this. -- w00t
+		 *
+		 * Also don't check Q:Lines for remote nickchanges, they should have our Q:Lines anyway to enforce themselves.
+		 *		-- w00t
+		 */
+		if (!IS_LOCAL(user))
+		{
+			XLine* mq = ServerInstance->XLines->MatchesLine("Q",parameters[0]);
+			if (mq)
+			{
+				if (user->registered == REG_ALL)
+				{
+					ServerInstance->SNO->WriteGlobalSno('a', "Q-Lined nickname %s from %s!%s@%s: %s",
+						parameters[0].c_str(), user->nick.c_str(), user->ident.c_str(), user->host.c_str(), mq->reason.c_str());
+				}
+				user->WriteNumeric(432, "%s %s :Invalid nickname: %s",user->nick.c_str(), parameters[0].c_str(), mq->reason.c_str());
+				return CMD_FAILURE;
+			}
+
+			if (ServerInstance->Config->RestrictBannedUsers)
+			{
+				for (UCListIter i = user->chans.begin(); i != user->chans.end(); i++)
+				{
+					Channel *chan = *i;
+					if (chan->GetPrefixValue(user) < VOICE_VALUE && chan->IsBanned(user))
+					{
+						user->WriteNumeric(404, "%s %s :Cannot send to channel (you're banned)", user->nick.c_str(), chan->name.c_str());
+						return CMD_FAILURE;
+					}
+				}
+			}
+		}
+
+		/*
+		 * Uh oh.. if the nickname is in use, and it's not in use by the person using it (doh) --
+		 * then we have a potential collide. Check whether someone else is camping on the nick
+		 * (i.e. connect -> send NICK, don't send USER.) If they are camping, force-change the
+		 * camper to their UID, and allow the incoming nick change.
+		 *
+		 * If the guy using the nick is already using it, tell the incoming nick change to gtfo,
+		 * because the nick is already (rightfully) in use. -- w00t
+		 */
+		User* InUse = ServerInstance->FindNickOnly(parameters[0]);
+		if (InUse && (InUse != user))
+		{
+			if (InUse->registered != REG_ALL)
+			{
+				/* force the camper to their UUID, and ask them to re-send a NICK. */
+				InUse->WriteTo(InUse, "NICK %s", InUse->uuid.c_str());
+				InUse->WriteNumeric(433, "%s %s :Nickname overruled.", InUse->nick.c_str(), InUse->nick.c_str());
+				InUse->UpdateNickHash(InUse->uuid.c_str());
+				InUse->nick.assign(InUse->uuid, 0, IS_LOCAL(InUse) ? ServerInstance->Config->Limits.NickMax : MAXBUF);
+				InUse->InvalidateCache();
+				InUse->registered &= ~REG_NICK;
+			}
+			else
+			{
+				/* No camping, tell the incoming user  to stop trying to change nick ;p */
+				user->WriteNumeric(433, "%s %s :Nickname is already in use.", user->registered >= REG_NICK ? user->nick.c_str() : "*", parameters[0].c_str());
+				return CMD_FAILURE;
+			}
+		}
+	}
+
+
+	ModResult MOD_RESULT;
+	FIRST_MOD_RESULT(ServerInstance, OnUserPreNick, MOD_RESULT, (user, parameters[0]));
+	if (MOD_RESULT == MOD_RES_DENY)
+		// if a module returns true, the nick change is silently forbidden.
+		return CMD_FAILURE;
+
+	if (user->registered == REG_ALL)
+		user->WriteCommon("NICK %s", parameters[0].c_str());
+
+	oldnick.assign(user->nick, 0, IS_LOCAL(user) ? ServerInstance->Config->Limits.NickMax : MAXBUF);
+
+	/* change the nick of the user in the users_hash */
+	user = user->UpdateNickHash(parameters[0].c_str());
+
+	/* actually change the nick within the record */
+	if (!user)
+		return CMD_FAILURE;
+
+	user->nick.assign(parameters[0], 0, IS_LOCAL(user) ? ServerInstance->Config->Limits.NickMax : MAXBUF);
+	user->InvalidateCache();
+
+	if (user->registered < REG_NICKUSER)
+	{
+		user->registered = (user->registered | REG_NICK);
+		if (user->registered == REG_NICKUSER)
+		{
+			/* user is registered now, bit 0 = USER command, bit 1 = sent a NICK command */
+			FIRST_MOD_RESULT(ServerInstance, OnUserRegister, MOD_RESULT, (user));
+			if (MOD_RESULT == MOD_RES_DENY)
+				return CMD_FAILURE;
+
+			// return early to not penalize new users
+			return CMD_SUCCESS;
+		}
+	}
+
+	if (user->registered == REG_ALL)
+	{
+		user->IncreasePenalty(10);
+		FOREACH_MOD(I_OnUserPostNick,OnUserPostNick(user, oldnick));
+	}
+
+	return CMD_SUCCESS;
+
+}
+
+
+COMMAND_INIT(CommandNick)