From c29272a157d09a8125788c1b860e89b63b4cb36c Mon Sep 17 00:00:00 2001
From: Hennadii Stepanov <32963518+hebasto@users.noreply.github.com>
Date: Sat, 12 Sep 2020 18:01:19 +0300
Subject: [PATCH] p2p: Add ReadAnchors()

---
 src/addrdb.cpp | 13 +++++++++++++
 src/addrdb.h   |  8 ++++++++
 2 files changed, 21 insertions(+)

diff --git a/src/addrdb.cpp b/src/addrdb.cpp
index ca2d66570bf..27f22826a9e 100644
--- a/src/addrdb.cpp
+++ b/src/addrdb.cpp
@@ -163,3 +163,16 @@ void DumpAnchors(const fs::path& anchors_db_path, const std::vector<CAddress>& a
     LOG_TIME_SECONDS(strprintf("Flush %d outbound block-relay-only peer addresses to anchors.dat", anchors.size()));
     SerializeFileDB("anchors", anchors_db_path, anchors);
 }
+
+std::vector<CAddress> ReadAnchors(const fs::path& anchors_db_path)
+{
+    std::vector<CAddress> anchors;
+    if (DeserializeFileDB(anchors_db_path, anchors)) {
+        LogPrintf("Loaded %i addresses from %s\n", anchors.size(), anchors_db_path.filename());
+    } else {
+        anchors.clear();
+    }
+
+    fs::remove(anchors_db_path);
+    return anchors;
+}
diff --git a/src/addrdb.h b/src/addrdb.h
index 614a0c20e30..4ac0e3e1b57 100644
--- a/src/addrdb.h
+++ b/src/addrdb.h
@@ -81,4 +81,12 @@ public:
  */
 void DumpAnchors(const fs::path& anchors_db_path, const std::vector<CAddress>& anchors);
 
+/**
+ * Read the anchor IP address database (anchors.dat)
+ *
+ * Deleting anchors.dat is intentional as it avoids renewed peering to anchors after
+ * an unclean shutdown and thus potential exploitation of the anchor peer policy.
+ */
+std::vector<CAddress> ReadAnchors(const fs::path& anchors_db_path);
+
 #endif // BITCOIN_ADDRDB_H