From 09645ebbda4c20937055edd481c8f5394ea2297f Mon Sep 17 00:00:00 2001
From: bert hubert <bert.hubert@netherlabs.nl>
Date: Wed, 2 Mar 2016 13:01:30 +0100
Subject: [PATCH] teach recursor packet cache to dump itself too for dump-cache

---
 pdns/recpacketcache.cc | 25 +++++++++++++++++++++++++
 pdns/recpacketcache.hh |  1 +
 2 files changed, 26 insertions(+)

diff --git a/pdns/recpacketcache.cc b/pdns/recpacketcache.cc
index 9478af2c6..68a4f3640 100644
--- a/pdns/recpacketcache.cc
+++ b/pdns/recpacketcache.cc
@@ -6,6 +6,7 @@
 #include "recpacketcache.hh"
 #include "cachecleaner.hh"
 #include "dns.hh"
+#include "dnsparser.hh"
 #include "namespaces.hh"
 #include "lock.hh"
 #include "dnswriter.hh"
@@ -165,3 +166,27 @@ void RecursorPacketCache::doPruneTo(unsigned int maxCached)
   pruneCollection(d_packetCache, maxCached);
 }
 
+uint64_t RecursorPacketCache::doDump(int fd)
+{
+  FILE* fp=fdopen(dup(fd), "w");
+  if(!fp) { // dup probably failed
+    return 0;
+  }
+  fprintf(fp, "; main packet cache dump from thread follows\n;\n");
+  const auto& sidx=d_packetCache.get<1>();
+
+  uint64_t count=0;
+  time_t now=time(0);
+  for(auto i=sidx.cbegin(); i != sidx.cend(); ++i) {
+    count++;
+    try {
+      fprintf(fp, "%s %d %s  ; tag %d\n", i->d_name.toString().c_str(), (int32_t)(i->d_ttd - now), DNSRecordContent::NumberToType(i->d_type).c_str(), i->d_tag);
+    }
+    catch(...) {
+      fprintf(fp, "; error printing '%s'\n", i->d_name.empty() ? "EMPTY" : i->d_name.toString().c_str());
+    }
+  }
+  fclose(fp);
+  return count;
+
+}
diff --git a/pdns/recpacketcache.hh b/pdns/recpacketcache.hh
index 0d6c1fb34..8cf7dd2d2 100644
--- a/pdns/recpacketcache.hh
+++ b/pdns/recpacketcache.hh
@@ -27,6 +27,7 @@ public:
   bool getResponsePacket(unsigned int tag, const std::string& queryPacket, time_t now, std::string* responsePacket, uint32_t* age);
   void insertResponsePacket(unsigned int tag, const DNSName& qname, uint16_t qtype, const std::string& queryPacket, const std::string& responsePacket, time_t now, uint32_t ttd);
   void doPruneTo(unsigned int maxSize=250000);
+  uint64_t doDump(int fd);
   int doWipePacketCache(const DNSName& name, uint16_t qtype=0xffff, bool subtree=false);
   
   void prune();
-- 
2.49.0