From c819f500c5eb9ad907e5e9a71c525afd2ccaee0c Mon Sep 17 00:00:00 2001
From: w00t <w00t@e03df62e-2008-0410-955e-edbf42e46eb7>
Date: Tue, 5 Aug 2008 19:12:21 +0000
Subject: Forward-port r10098 and r10099, fixing anope+inspircd=ftopic ddos.
 Thanks to Namegduf for all his help.

git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@10100 e03df62e-2008-0410-955e-edbf42e46eb7
---
 src/modules/m_spanningtree/ftopic.cpp | 34 +++++++++++++++++++++++-----------
 1 file changed, 23 insertions(+), 11 deletions(-)

(limited to 'src')

diff --git a/src/modules/m_spanningtree/ftopic.cpp b/src/modules/m_spanningtree/ftopic.cpp
index e18187087..663baa089 100644
--- a/src/modules/m_spanningtree/ftopic.cpp
+++ b/src/modules/m_spanningtree/ftopic.cpp
@@ -33,17 +33,12 @@ bool TreeSocket::ForceTopic(const std::string &source, std::deque<std::string> &
 	{
 		if ((ts >= c->topicset) || (c->topic.empty()))
 		{
-			std::string oldtopic = c->topic;
-			c->topic.assign(params[3], 0, Instance->Config->Limits.MaxTopic);
-			c->setby.assign(params[2], 0, 127);
-			c->topicset = ts;
-			/* if the topic text is the same as the current topic,
-			 * dont bother to send the TOPIC command out, just silently
-			 * update the set time and set nick.
-			 */
-			if (oldtopic != params[3])
+			User* user = this->Instance->FindNick(source);
+
+			if (c->topic != params[3])
 			{
-				User* user = this->Instance->FindNick(source);
+				// Update topic only when it differs from current topic
+				c->topic.assign(params[3], 0, Instance->Config->Limits.MaxTopic);
 				if (!user)
 				{
 					c->WriteChannelWithServ(Instance->Config->ServerName, "TOPIC %s :%s", c->name.c_str(), c->topic.c_str());
@@ -51,10 +46,27 @@ bool TreeSocket::ForceTopic(const std::string &source, std::deque<std::string> &
 				else
 				{
 					c->WriteChannel(user, "TOPIC %s :%s", c->name.c_str(), c->topic.c_str());
-					nsource = user->server;
 				}
 			}
 
+			// Always update setter and settime.
+			c->setby.assign(params[2], 0, 127);
+			c->topicset = ts;
+
+			/*
+			 * Take careful note of what happens here;
+			 * Above, we display the topic change to the server IF the topic incoming is different to the topic already set.
+			 * HERE, we find the server the user that sent this topic is on, so we *do not* send topics back to the link they just
+			 * came from. This *cannot* be easily merged with the above check!
+			 *
+			 * Thanks to Anope and Namegduf for finally helping me isolate this
+			 *			-- w00t (5th/aug/2008)
+			 */
+			if (user)
+			{
+				nsource = user->server;
+			}
+
 			/* all done, send it on its way */
 			params[3] = ":" + params[3];
 			User* u = Instance->FindNick(nsource);
-- 
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