Cache responses to addr requests

Prevents a spy from scraping victim's AddrMan by
reconnecting and re-requesting addrs.

1 files changed, 11 insertions, 0 deletions

diff --git a/src/net.cpp b/src/net.cpp
index 171358bb5f..bf29d928a1 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -2539,6 +2539,17 @@ std::vector<CAddress> CConnman::GetAddresses()
     return addresses;
 }
 
+std::vector<CAddress> CConnman::GetAddresses(Network requestor_network)
+{
+    const auto current_time = GetTime<std::chrono::microseconds>();
+    if (m_addr_response_caches.find(requestor_network) == m_addr_response_caches.end() ||
+        m_addr_response_caches[requestor_network].m_update_addr_response < current_time) {
+        m_addr_response_caches[requestor_network].m_addrs_response_cache = GetAddresses();
+        m_addr_response_caches[requestor_network].m_update_addr_response = current_time + std::chrono::hours(21) + GetRandMillis(std::chrono::hours(6));
+    }
+    return m_addr_response_caches[requestor_network].m_addrs_response_cache;
+}
+
 bool CConnman::AddNode(const std::string& strNode)
 {
     LOCK(cs_vAddedNodes);