net: Log to net category for exceptions in ProcessMessages

Remove the forest of special exceptions, and simply log a short
message to the NET logging category when an exception happens during
packet processing. It is not good to panick end users with errors
that any peer can generate (let alone writing to stderr).

Author: laanwj

src/net_processing.cpp

@@ -3333,32 +3333,10 @@ bool PeerLogicValidation::ProcessMessages(CNode* pfrom, std::atomic<bool>& inter
             return false;
         if (!pfrom->vRecvGetData.empty())
             fMoreWork = true;
-    }
-    catch (const std::ios_base::failure& e)
-    {
-        if (strstr(e.what(), "end of data")) {
-            // Allow exceptions from under-length message on vRecv
-            LogPrint(BCLog::NET, "%s(%s, %u bytes): Exception '%s' caught, normally caused by a message being shorter than its stated length\n", __func__, SanitizeString(strCommand), nMessageSize, e.what());
-        } else if (strstr(e.what(), "size too large")) {
-            // Allow exceptions from over-long size
-            LogPrint(BCLog::NET, "%s(%s, %u bytes): Exception '%s' caught\n", __func__, SanitizeString(strCommand), nMessageSize, e.what());
-        } else if (strstr(e.what(), "non-canonical ReadCompactSize()")) {
-            // Allow exceptions from non-canonical encoding
-            LogPrint(BCLog::NET, "%s(%s, %u bytes): Exception '%s' caught\n", __func__, SanitizeString(strCommand), nMessageSize, e.what());
-        } else if (strstr(e.what(), "Superfluous witness record")) {
-            // Allow exceptions from illegal witness encoding
-            LogPrint(BCLog::NET, "%s(%s, %u bytes): Exception '%s' caught\n", __func__, SanitizeString(strCommand), nMessageSize, e.what());
-        } else if (strstr(e.what(), "Unknown transaction optional data")) {
-            // Allow exceptions from unknown witness encoding
-            LogPrint(BCLog::NET, "%s(%s, %u bytes): Exception '%s' caught\n", __func__, SanitizeString(strCommand), nMessageSize, e.what());
-        } else {
-            PrintExceptionContinue(&e, "ProcessMessages()");
-        }
-    }
-    catch (const std::exception& e) {
-        PrintExceptionContinue(&e, "ProcessMessages()");
+    } catch (const std::exception& e) {
+        LogPrint(BCLog::NET, "%s(%s, %u bytes): Exception '%s' (%s) caught\n", __func__, SanitizeString(strCommand), nMessageSize, e.what(), typeid(e).name());
     } catch (...) {
-        PrintExceptionContinue(nullptr, "ProcessMessages()");
+        LogPrint(BCLog::NET, "%s(%s, %u bytes): Unknown exception caught\n", __func__, SanitizeString(strCommand), nMessageSize);
     }
 
     if (!fRet) {