From 27fff3b72a4e00f515c63168e03b3454f0d91d19 Mon Sep 17 00:00:00 2001
From: Torsten Dreyer <torsten@t3r.de>
Date: Wed, 9 Nov 2016 12:03:37 +0100
Subject: [PATCH] Sort DNS TXT entries and provide an attribute map

---
 simgear/io/DNSClient.cxx | 16 ++++++++++++++--
 simgear/io/DNSClient.hxx |  2 ++
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/simgear/io/DNSClient.cxx b/simgear/io/DNSClient.cxx
index 13f44b41..c1c7b25f 100644
--- a/simgear/io/DNSClient.cxx
+++ b/simgear/io/DNSClient.cxx
@@ -75,6 +75,13 @@ SRVRequest::SRVRequest( const std::string & dn ) :
     _type = DNS_T_SRV;
 }
 
+static bool sortSRV( const SRVRequest::SRV_ptr a, const SRVRequest::SRV_ptr b )
+{
+    if( a->priority > b->priority ) return false;
+    if( a->priority < b->priority ) return true;
+    return a->weight > b->weight;
+}
+
 static void dnscbSRV(struct dns_ctx *ctx, struct dns_rr_srv *result, void *data)
 {
     SRVRequest * r = static_cast<SRVRequest*>(data);
@@ -90,7 +97,7 @@ static void dnscbSRV(struct dns_ctx *ctx, struct dns_rr_srv *result, void *data)
             srv->port = result->dnssrv_srv[i].port;
             srv->target = result->dnssrv_srv[i].name;
         }
-//        std::sort( r->entries.begin(), r->entries.end(), sortNAPTR );
+        std::sort( r->entries.begin(), r->entries.end(), sortSRV );
         free(result);
     }
     r->setComplete();
@@ -120,7 +127,12 @@ static void dnscbTXT(struct dns_ctx *ctx, struct dns_rr_txt *result, void *data)
         r->ttl = result->dnstxt_ttl;
         for (int i = 0; i < result->dnstxt_nrr; i++) {
           //TODO: interprete the .len field of dnstxt_txt?
-          r->entries.push_back(string((char*)result->dnstxt_txt[i].txt));
+          string txt = string((char*)result->dnstxt_txt[i].txt);
+          r->entries.push_back( txt );
+          string_list tokens = simgear::strutils::split( txt, "=", 1 );
+          if( tokens.size() == 2 ) {
+            r->attributes[tokens[0]] = tokens[1];
+          }
         }
         free(result);
     }
diff --git a/simgear/io/DNSClient.hxx b/simgear/io/DNSClient.hxx
index 41fa6a17..2d2a4882 100644
--- a/simgear/io/DNSClient.hxx
+++ b/simgear/io/DNSClient.hxx
@@ -110,7 +110,9 @@ public:
     virtual void submit();
 
     typedef std::vector<string> TXT_list;
+    typedef std::map<std::string,std::string> TXT_Attribute_map;
     TXT_list entries;
+    TXT_Attribute_map attributes;
 };
 
 class Client