Limit the maximal read buffer space that is used for every socket

CSocket caches the data read from a socket and then looks for lines in there.
If there is no line end, this buffer can grow quite large. This patch now
closes sockets if they get a huge read buffer.


git-svn-id: https://znc.svn.sourceforge.net/svnroot/znc/trunk@1233 726aef4b-f618-498e-8847-2d620e286838

Client.h

@@ -75,6 +75,9 @@ public:
 		m_bNamesx = false;
 		m_bUHNames = false;
 		EnableReadLine();
+		// RFC says a line can have 512 chars max, but we are
+		// a little more gentle ;)
+		SetMaxBufferThreshold(1024);
 
 		StartLoginTimeout();
 	}
@@ -113,6 +116,7 @@ public:
 	virtual void Connected();
 	virtual void Disconnected();
 	virtual void ConnectionRefused();
+	virtual void ReachedMaxBuffer();
 
 	void SetNick(const CString& s);
 	CUser* GetUser() const { return m_pUser; }