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

Modules.h

@@ -139,6 +139,9 @@ public:
 	using Csock::Connect;
 	using Csock::Listen;
 
+	// This defaults to closing the socket, feel free to override
+	virtual void ReachedMaxBuffer();
+
 	bool Connect(const CString& sHostname, unsigned short uPort, bool bSSL = false, unsigned int uTimeout = 60);
 	bool Listen(unsigned short uPort, bool bSSL = false, unsigned int uTimeout = 0);
 	virtual bool PutIRC(const CString& sLine);