made bdecode not throw

include/libtorrent/bencode.hpp

@@ -394,14 +394,7 @@ namespace libtorrent
 		bool err = false;
 		detail::bdecode_recursive(start, end, e, err, 0);
 		TORRENT_ASSERT(e.m_type_queried == false);
-		if (err)
-		{
-#ifdef BOOST_NO_EXCEPTIONS
-			return entry();
-#else
-			throw invalid_encoding();
-#endif
-		}
+		if (err) return entry();
 		return e;
 	}
 
@@ -414,14 +407,7 @@ namespace libtorrent
 		detail::bdecode_recursive(start, end, e, err, 0);
 		len = std::distance(s, start);
 		TORRENT_ASSERT(len >= 0);
-		if (err)
-		{
-#ifdef BOOST_NO_EXCEPTIONS
-			return entry();
-#else
-			throw invalid_encoding();
-#endif
-		}
+		if (err) return entry();
 		return e;
 	}
 }

src/http_tracker_connection.cpp

@@ -226,13 +226,7 @@ namespace libtorrent
 		
 		// handle tracker response
 		entry e;
-#ifndef BOOST_NO_EXCEPTIONS
-		try {
-#endif
 		e = bdecode(data, data + size);
-#ifndef BOOST_NO_EXCEPTIONS
-		} catch (std::exception&) {}
-#endif
 
 		if (e.type() != entry::undefined_t)
 		{

src/kademlia/dht_tracker.cpp

@@ -444,6 +444,15 @@ namespace libtorrent { namespace dht
 			TORRENT_ASSERT(bytes_transferred > 0);
 
 			entry e = bdecode(buf, buf + bytes_transferred);
+			if (e.type() == entry::undefined_t)
+			{
+#ifdef TORRENT_DHT_VERBOSE_LOGGING
+				std::string msg(buf, buf + bytes_transferred);
+				TORRENT_LOG(dht_tracker) << "invalid incoming packet: "
+					<< e.what() << "\n" << msg << "\n";
+#endif
+				return;
+			}
 
 #ifdef TORRENT_DHT_VERBOSE_LOGGING
 			std::stringstream log_line;

src/ut_metadata.cpp

@@ -306,7 +306,7 @@ namespace libtorrent { namespace
 
 			if (length > 17 * 1024)
 			{
-				m_pc.disconnect("ut_metadata message larger than 17 kB");
+				m_pc.disconnect("ut_metadata message larger than 17 kB", 2);
 				return true;
 			}
 
@@ -314,6 +314,11 @@ namespace libtorrent { namespace
 
 			int len;
 			entry msg = bdecode(body.begin, body.end, len);
+			if (msg.type() == entry::undefined_t)
+			{
+				m_pc.disconnect("invalid bencoding in ut_metadata message", 2);
+				return true;
+			}
 
 			int type = msg["msg_type"].integer();
 			int piece = msg["piece"].integer();
@@ -364,7 +369,7 @@ namespace libtorrent { namespace
 				{
 					std::stringstream msg;
 					msg << "unknown ut_metadata extension message: " << type;
-					m_pc.disconnect(msg.str().c_str());
+					m_pc.disconnect(msg.str().c_str(), 2);
 				}
 			}
 			return true;

src/ut_pex.cpp

@@ -216,13 +216,18 @@ namespace libtorrent { namespace
 
 			if (length > 500 * 1024)
 			{
-				m_pc.disconnect("peer exchange message larger than 500 kB");
+				m_pc.disconnect("peer exchange message larger than 500 kB", 2);
 				return true;
 			}
 
 			if (body.left() < length) return true;
 
 			entry pex_msg = bdecode(body.begin, body.end);
+			if (pex_msg.type() == entry::undefined_t)
+			{
+				m_pc.disconnect("invalid bencoding in ut_metadata message", 2);
+				return true;
+			}
 
 			entry const* p = pex_msg.find_key("added");
 			entry const* pf = pex_msg.find_key("added.f");