add a max levin packet size by command type

contrib/epee/include/net/levin_protocol_handler_async.h

@@ -434,7 +434,7 @@ public:
               //async call scenario
               boost::shared_ptr<invoke_response_handler_base> response_handler = m_invoke_response_handlers.front();
               response_handler->reset_timer();
-              MDEBUG(m_connection_context << "LEVIN_PACKET partial msg received. len=" << cb);
+              MDEBUG(m_connection_context << "LEVIN_PACKET partial msg received. len=" << cb << ", current total " << m_cache_in_buffer.size() << "/" << m_current_head.m_cb << " (" << (100.0f * m_cache_in_buffer.size() / (m_current_head.m_cb ? m_current_head.m_cb : 1)) << "%)");
             }
           }
           break;
@@ -469,6 +469,14 @@ public:
             temp = std::move(m_fragment_buffer);
             m_fragment_buffer.clear();
             std::memcpy(std::addressof(m_current_head), std::addressof(temp[0]), sizeof(bucket_head2));
+            const size_t max_bytes = m_connection_context.get_max_bytes(m_current_head.m_command);
+            if(m_current_head.m_cb > std::min<size_t>(max_packet_size, max_bytes))
+            {
+              MERROR(m_connection_context << "Maximum packet size exceed!, m_max_packet_size = " << std::min<size_t>(max_packet_size, max_bytes)
+                << ", packet header received " << m_current_head.m_cb << ", command " << m_current_head.m_command
+                << ", connection will be closed.");
+              return false;
+            }
             buff_to_invoke = {reinterpret_cast<const uint8_t*>(temp.data()) + sizeof(bucket_head2), temp.size() - sizeof(bucket_head2)};
           }
 
@@ -584,10 +592,11 @@ public:
           m_cache_in_buffer.erase(sizeof(bucket_head2));
           m_state = stream_state_body;
           m_oponent_protocol_ver = m_current_head.m_protocol_version;
-          if(m_current_head.m_cb > max_packet_size)
+          const size_t max_bytes = m_connection_context.get_max_bytes(m_current_head.m_command);
+          if(m_current_head.m_cb > std::min<size_t>(max_packet_size, max_bytes))
           {
-            LOG_ERROR_CC(m_connection_context, "Maximum packet size exceed!, m_max_packet_size = " << max_packet_size
-              << ", packet header received " << m_current_head.m_cb 
+            LOG_ERROR_CC(m_connection_context, "Maximum packet size exceed!, m_max_packet_size = " << std::min<size_t>(max_packet_size, max_bytes)
+              << ", packet header received " << m_current_head.m_cb << ", command " << m_current_head.m_command
               << ", connection will be closed.");
             return false;
           }

src/cryptonote_basic/connection_context.h

@@ -31,6 +31,7 @@
 #pragma once
 #include <unordered_set>
 #include <atomic>
+#include <algorithm>
 #include <boost/date_time/posix_time/posix_time.hpp>
 #include "net/net_utils_base.h"
 #include "copyable_atomic.h"
@@ -57,6 +58,27 @@ namespace cryptonote
 
     bool handshake_complete() const noexcept { return m_state != state_before_handshake; }
 
+    void set_max_bytes(int command, size_t bytes) {
+      const auto i = std::lower_bound(m_max_bytes.begin(), m_max_bytes.end(), std::make_pair(command, bytes), [](const std::pair<int, size_t> &e0, const std::pair<int, size_t> &e1){
+        return e0.first < e1.first;
+      });
+      if (i == m_max_bytes.end())
+        m_max_bytes.push_back(std::make_pair(command, bytes));
+      else if (i->first == command)
+        i->second = bytes;
+      else
+        m_max_bytes.insert(i, std::make_pair(command, bytes));
+    }
+    size_t get_max_bytes(int command) const {
+      const auto i = std::lower_bound(m_max_bytes.begin(), m_max_bytes.end(), std::make_pair(command, 0), [](const std::pair<int, size_t> &e0, const std::pair<int, size_t> &e1){
+        return e0.first < e1.first;
+      });
+      if (i == m_max_bytes.end() || i->first != command)
+        return std::numeric_limits<size_t>::max();
+      else
+        return i->second;
+    }
+
     state m_state;
     std::vector<std::pair<crypto::hash, uint64_t>> m_needed_objects;
     std::unordered_set<crypto::hash> m_requested_objects;
@@ -73,6 +95,7 @@ namespace cryptonote
     int m_expect_response;
     uint64_t m_expect_height;
     size_t m_num_requested;
+    std::vector<std::pair<int, size_t>> m_max_bytes;
   };
 
   inline std::string get_protocol_state_string(cryptonote_connection_context::state s)

src/cryptonote_protocol/cryptonote_protocol_handler.h

@@ -110,6 +110,7 @@ namespace cryptonote
     std::list<connection_info> get_connections();
     const block_queue &get_block_queue() const { return m_block_queue; }
     void stop();
+    void on_connection_new(cryptonote_connection_context &context);
     void on_connection_close(cryptonote_connection_context &context);
     void set_max_out_peers(unsigned int max) { m_max_out_peers = max; }
     bool no_sync() const { return m_no_sync; }

src/cryptonote_protocol/cryptonote_protocol_handler.inl

@@ -2873,6 +2873,25 @@ skip:
   }
   //------------------------------------------------------------------------------------------------------------------------
   template<class t_core>
+  void t_cryptonote_protocol_handler<t_core>::on_connection_new(cryptonote_connection_context &context)
+  {
+    context.set_max_bytes(nodetool::COMMAND_HANDSHAKE_T<cryptonote::CORE_SYNC_DATA>::ID, 65536);
+    context.set_max_bytes(nodetool::COMMAND_TIMED_SYNC_T<cryptonote::CORE_SYNC_DATA>::ID, 65536);
+    context.set_max_bytes(nodetool::COMMAND_PING::ID, 4096);
+    context.set_max_bytes(nodetool::COMMAND_REQUEST_SUPPORT_FLAGS::ID, 4096);
+
+    context.set_max_bytes(cryptonote::NOTIFY_NEW_BLOCK::ID, 1024 * 1024 * 128); // 128 MB (max packet is a bit less than 100 MB though)
+    context.set_max_bytes(cryptonote::NOTIFY_NEW_TRANSACTIONS::ID, 1024 * 1024 * 128); // 128 MB (max packet is a bit less than 100 MB though)
+    context.set_max_bytes(cryptonote::NOTIFY_REQUEST_GET_OBJECTS::ID, 1024 * 1024 * 2); // 2 MB
+    context.set_max_bytes(cryptonote::NOTIFY_RESPONSE_GET_OBJECTS::ID, 1024 * 1024 * 128); // 128 MB (max packet is a bit less than 100 MB though)
+    context.set_max_bytes(cryptonote::NOTIFY_REQUEST_CHAIN::ID, 512 * 1024); // 512 kB
+    context.set_max_bytes(cryptonote::NOTIFY_RESPONSE_CHAIN_ENTRY::ID, 1024 * 1024 * 4); // 4 MB
+    context.set_max_bytes(cryptonote::NOTIFY_NEW_FLUFFY_BLOCK::ID, 1024 * 1024 * 4); // 4 MB, but it does not includes transaction data
+    context.set_max_bytes(cryptonote::NOTIFY_REQUEST_FLUFFY_MISSING_TX::ID, 1024 * 1024); // 1 MB
+    context.set_max_bytes(cryptonote::NOTIFY_GET_TXPOOL_COMPLEMENT::ID, 1024 * 1024 * 4); // 4 MB
+  }
+  //------------------------------------------------------------------------------------------------------------------------
+  template<class t_core>
   void t_cryptonote_protocol_handler<t_core>::on_connection_close(cryptonote_connection_context &context)
   {
     uint64_t target = 0;

src/p2p/net_node.inl

@@ -2633,6 +2633,7 @@ namespace nodetool
   void node_server<t_payload_net_handler>::on_connection_new(p2p_connection_context& context)
   {
     MINFO("["<< epee::net_utils::print_connection_context(context) << "] NEW CONNECTION");
+    m_payload_handler.on_connection_new(context);
   }
   //-----------------------------------------------------------------------------------
   template<class t_payload_net_handler>

tests/fuzz/levin.cpp

@@ -54,6 +54,7 @@ namespace
   {
     static constexpr int handshake_command() noexcept { return 1001; }
     static constexpr bool handshake_complete() noexcept { return true; }
+    size_t get_max_bytes(int command) const { return LEVIN_DEFAULT_MAX_PACKET_SIZE; }
   };
 
   typedef epee::levin::async_protocol_handler_config<test_levin_connection_context> test_levin_protocol_handler_config;

tests/net_load_tests/net_load_tests.h

@@ -50,6 +50,7 @@ namespace net_load_tests
     test_connection_context(): epee::net_utils::connection_context_base(boost::uuids::nil_uuid(), {}, false, false), m_closed(false) {}
     static constexpr int handshake_command() noexcept { return 1001; }
     static constexpr bool handshake_complete() noexcept { return true; }
+    size_t get_max_bytes(int command) const { return LEVIN_DEFAULT_MAX_PACKET_SIZE; }
     volatile bool m_closed;
   };
 

tests/unit_tests/epee_levin_protocol_handler_async.cpp

@@ -45,6 +45,7 @@ namespace
   {
     static constexpr int handshake_command() noexcept { return 1001; }
     static constexpr bool handshake_complete() noexcept { return true; }
+    size_t get_max_bytes(int command) const { return LEVIN_DEFAULT_MAX_PACKET_SIZE; }
   };
 
   typedef epee::levin::async_protocol_handler_config<test_levin_connection_context> test_levin_protocol_handler_config;