From 5935ef0d212c588547f10031192ddee3418dfe7b Mon Sep 17 00:00:00 2001
From: David Kalnischkies <david@kalnischkies.de>
Date: Fri, 11 May 2018 14:35:30 +0200
Subject: don't try SRV requests based on IP addresses

IP addresses are by definition not a domain so in the best case the
requests will just fail; we can do better than that on our own.
---
 apt-pkg/contrib/srvrec.cc | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/apt-pkg/contrib/srvrec.cc b/apt-pkg/contrib/srvrec.cc
index 930989bfc..a97d9c615 100644
--- a/apt-pkg/contrib/srvrec.cc
+++ b/apt-pkg/contrib/srvrec.cc
@@ -11,6 +11,7 @@
 #include <netdb.h>
 
 #include <arpa/nameser.h>
+#include <arpa/inet.h>
 #include <netinet/in.h>
 #include <resolv.h>
 #include <time.h>
@@ -32,6 +33,15 @@ bool SrvRec::operator==(SrvRec const &other) const
 
 bool GetSrvRecords(std::string host, int port, std::vector<SrvRec> &Result)
 {
+   // try SRV only for hostnames, not for IP addresses
+   {
+      struct in_addr addr4;
+      struct in6_addr addr6;
+      if (inet_pton(AF_INET, host.c_str(), &addr4) == 1 ||
+	  inet_pton(AF_INET6, host.c_str(), &addr6) == 1)
+	 return true;
+   }
+
    std::string target;
    int res;
    struct servent s_ent_buf;
-- 
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