From dd2ace5916a8bb24801e74aa8b209d396e012d9b Mon Sep 17 00:00:00 2001
From: danieldg <danieldg@e03df62e-2008-0410-955e-edbf42e46eb7>
Date: Sat, 9 Jan 2010 17:29:28 +0000
Subject: Disallow adding prefix-mode when it is already set (fixes bug #935)

git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@12245 e03df62e-2008-0410-955e-edbf42e46eb7
---
 include/channels.h            |  3 ++-
 src/channels.cpp              |  9 +++++----
 src/mode.cpp                  | 17 ++++++++++-------
 src/modules/m_chanprotect.cpp |  9 ---------
 4 files changed, 17 insertions(+), 21 deletions(-)

diff --git a/include/channels.h b/include/channels.h
index 59f4d1cf3..591847407 100644
--- a/include/channels.h
+++ b/include/channels.h
@@ -362,8 +362,9 @@ class CoreExport Channel : public Extensible
 	 * @param user The user to associate the privilage with
 	 * @param prefix The prefix character to associate
 	 * @param adding True if adding the prefix, false when removing
+	 * @return True if a change was made
 	 */
-	void SetPrefix(User* user, char prefix, bool adding);
+	bool SetPrefix(User* user, char prefix, bool adding);
 
 	/** Check if a user is banned on this channel
 	 * @param user A user to check against the banlist
diff --git a/src/channels.cpp b/src/channels.cpp
index 31038484e..b0951c8cc 100644
--- a/src/channels.cpp
+++ b/src/channels.cpp
@@ -929,14 +929,14 @@ unsigned int Channel::GetPrefixValue(User* user)
 	return m->second->getRank();
 }
 
-void Channel::SetPrefix(User* user, char prefix, bool adding)
+bool Channel::SetPrefix(User* user, char prefix, bool adding)
 {
 	ModeHandler* delta_mh = ServerInstance->Modes->FindMode(prefix, MODETYPE_CHANNEL);
 	if (!delta_mh)
-		return;
+		return false;
 	UserMembIter m = userlist.find(user);
 	if (m == userlist.end())
-		return;
+		return false;
 	for(unsigned int i=0; i < m->second->modes.length(); i++)
 	{
 		char mchar = m->second->modes[i];
@@ -947,11 +947,12 @@ void Channel::SetPrefix(User* user, char prefix, bool adding)
 				m->second->modes.substr(0,i) +
 				(adding ? std::string(1, prefix) : "") +
 				m->second->modes.substr(mchar == prefix ? i+1 : i);
-			return;
+			return adding != (mchar == prefix);
 		}
 	}
 	if (adding)
 		m->second->modes += std::string(1, prefix);
+	return adding;
 }
 
 void Channel::RemoveAllPrefixes(User* user)
diff --git a/src/mode.cpp b/src/mode.cpp
index 7d99277df..28390d327 100644
--- a/src/mode.cpp
+++ b/src/mode.cpp
@@ -353,6 +353,15 @@ ModeAction ModeParser::TryMode(User* user, User* targetuser, Channel* chan, bool
 		return MODEACTION_DENY;
 	}
 
+	if (mh->GetPrefixRank() && chan)
+	{
+		User* user_to_prefix = ServerInstance->FindNick(parameter);
+		if (!user_to_prefix)
+			return MODEACTION_DENY;
+		if (!chan->SetPrefix(user_to_prefix, modechar, adding))
+			return MODEACTION_DENY;
+	}
+
 	/* Call the handler for the mode */
 	ModeAction ma = mh->OnModeChange(user, targetuser, chan, parameter, adding);
 
@@ -362,15 +371,9 @@ ModeAction ModeParser::TryMode(User* user, User* targetuser, Channel* chan, bool
 	if (ma != MODEACTION_ALLOW)
 		return ma;
 
+	// TODO this count may not be reliable
 	mh->ChangeCount(adding ? 1 : -1);
 
-	if (mh->GetPrefixRank() && chan)
-	{
-		User* user_to_prefix = ServerInstance->FindNick(parameter);
-		if (user_to_prefix)
-			chan->SetPrefix(user_to_prefix, modechar, adding);
-	}
-
 	for (ModeWatchIter watchers = modewatchers[handler_id].begin(); watchers != modewatchers[handler_id].end(); watchers++)
 		(*watchers)->AfterMode(user, targetuser, chan, parameter, adding, type);
 
diff --git a/src/modules/m_chanprotect.cpp b/src/modules/m_chanprotect.cpp
index 369703d2c..8a842b626 100644
--- a/src/modules/m_chanprotect.cpp
+++ b/src/modules/m_chanprotect.cpp
@@ -147,10 +147,6 @@ class ChanFounder : public ModeHandler, public FounderProtectBase
 
 	ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string &parameter, bool adding)
 	{
-		User* theuser = ServerInstance->FindNick(parameter);
-
-		if (!theuser)
-			return MODEACTION_DENY;
 		return MODEACTION_ALLOW;
 	}
 
@@ -218,11 +214,6 @@ class ChanProtect : public ModeHandler, public FounderProtectBase
 
 	ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string &parameter, bool adding)
 	{
-		User* theuser = ServerInstance->FindNick(parameter);
-
-		if (!theuser)
-			return MODEACTION_DENY;
-
 		return MODEACTION_ALLOW;
 	}
 
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