From 65c40049633f0c5db3c24af8716bb683520f368c Mon Sep 17 00:00:00 2001
From: moneromooo-monero <moneromooo-monero@users.noreply.github.com>
Date: Fri, 29 Mar 2019 10:47:53 +0000
Subject: allow blocking whole subnets

---
 src/p2p/net_node.inl | 104 +++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 96 insertions(+), 8 deletions(-)

(limited to 'src/p2p/net_node.inl')

diff --git a/src/p2p/net_node.inl b/src/p2p/net_node.inl
index 37a3f393d..f8011ec0e 100644
--- a/src/p2p/net_node.inl
+++ b/src/p2p/net_node.inl
@@ -155,19 +155,55 @@ namespace nodetool
   }
   //-----------------------------------------------------------------------------------
   template<class t_payload_net_handler>
-  bool node_server<t_payload_net_handler>::is_remote_host_allowed(const epee::net_utils::network_address &address)
+  bool node_server<t_payload_net_handler>::is_remote_host_allowed(const epee::net_utils::network_address &address, time_t *t)
   {
     CRITICAL_REGION_LOCAL(m_blocked_hosts_lock);
+
+    const time_t now = time(nullptr);
+
+    // look in the hosts list
     auto it = m_blocked_hosts.find(address);
-    if(it == m_blocked_hosts.end())
-      return true;
-    if(time(nullptr) >= it->second)
+    if (it != m_blocked_hosts.end())
     {
-      m_blocked_hosts.erase(it);
-      MCLOG_CYAN(el::Level::Info, "global", "Host " << address.host_str() << " unblocked.");
-      return true;
+      if (now >= it->second)
+      {
+        m_blocked_hosts.erase(it);
+        MCLOG_CYAN(el::Level::Info, "global", "Host " << address.host_str() << " unblocked.");
+        it = m_blocked_hosts.end();
+      }
+      else
+      {
+        if (t)
+          *t = it->second - now;
+        return false;
+      }
     }
-    return false;
+
+    // manually loop in subnets
+    if (address.get_type_id() == epee::net_utils::address_type::ipv4)
+    {
+      auto ipv4_address = address.template as<epee::net_utils::ipv4_network_address>();
+      std::map<epee::net_utils::ipv4_network_subnet, time_t>::iterator it;
+      for (it = m_blocked_subnets.begin(); it != m_blocked_subnets.end(); )
+      {
+        if (now >= it->second)
+        {
+          it = m_blocked_subnets.erase(it);
+          MCLOG_CYAN(el::Level::Info, "global", "Subnet " << it->first.host_str() << " unblocked.");
+          continue;
+        }
+        if (it->first.matches(ipv4_address))
+        {
+          if (t)
+            *t = it->second - now;
+          return false;
+        }
+        ++it;
+      }
+    }
+
+    // not found in hosts or subnets, allowed
+    return true;
   }
   //-----------------------------------------------------------------------------------
   template<class t_payload_net_handler>
@@ -223,6 +259,58 @@ namespace nodetool
   }
   //-----------------------------------------------------------------------------------
   template<class t_payload_net_handler>
+  bool node_server<t_payload_net_handler>::block_subnet(const epee::net_utils::ipv4_network_subnet &subnet, time_t seconds)
+  {
+    const time_t now = time(nullptr);
+
+    CRITICAL_REGION_LOCAL(m_blocked_hosts_lock);
+    time_t limit;
+    if (now > std::numeric_limits<time_t>::max() - seconds)
+      limit = std::numeric_limits<time_t>::max();
+    else
+      limit = now + seconds;
+    m_blocked_subnets[subnet] = limit;
+
+    // drop any connection to that subnet. This should only have to look into
+    // the zone related to the connection, but really make sure everything is
+    // swept ...
+    std::vector<boost::uuids::uuid> conns;
+    for(auto& zone : m_network_zones)
+    {
+      zone.second.m_net_server.get_config_object().foreach_connection([&](const p2p_connection_context& cntxt)
+      {
+        if (cntxt.m_remote_address.get_type_id() != epee::net_utils::ipv4_network_address::get_type_id())
+          return true;
+        auto ipv4_address = cntxt.m_remote_address.template as<epee::net_utils::ipv4_network_address>();
+        if (subnet.matches(ipv4_address))
+        {
+          conns.push_back(cntxt.m_connection_id);
+        }
+        return true;
+      });
+      for (const auto &c: conns)
+        zone.second.m_net_server.get_config_object().close(c);
+
+      conns.clear();
+    }
+
+    MCLOG_CYAN(el::Level::Info, "global", "Subnet " << subnet.host_str() << " blocked.");
+    return true;
+  }
+  //-----------------------------------------------------------------------------------
+  template<class t_payload_net_handler>
+  bool node_server<t_payload_net_handler>::unblock_subnet(const epee::net_utils::ipv4_network_subnet &subnet)
+  {
+    CRITICAL_REGION_LOCAL(m_blocked_hosts_lock);
+    auto i = m_blocked_subnets.find(subnet);
+    if (i == m_blocked_subnets.end())
+      return false;
+    m_blocked_subnets.erase(i);
+    MCLOG_CYAN(el::Level::Info, "global", "Subnet " << subnet.host_str() << " unblocked.");
+    return true;
+  }
+  //-----------------------------------------------------------------------------------
+  template<class t_payload_net_handler>
   bool node_server<t_payload_net_handler>::add_host_fail(const epee::net_utils::network_address &address)
   {
     if(!address.is_blockable())
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