From 5019022e13ac1f807d818ab4c8d6aafc1bd7d66d Mon Sep 17 00:00:00 2001
From: Ivan Nardi <12729895+IvanNardi@users.noreply.github.com>
Date: Mon, 31 Jul 2023 07:44:43 +0200
Subject: DNS: extract geolocation information, if available (#2065)

The option NSID (RFC5001) is used by Google DNS to report the
airport code of the metro where the DNS query is handled.

This option is quite rare, but the added overhead in DNS code is pretty
much zero for "normal" DNS traffic
---
 example/ndpiReader.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'example/ndpiReader.c')

diff --git a/example/ndpiReader.c b/example/ndpiReader.c
index 260d956d5..7856ae1a0 100644
--- a/example/ndpiReader.c
+++ b/example/ndpiReader.c
@@ -1779,6 +1779,8 @@ static void printFlow(u_int32_t id, struct ndpi_flow_info *flow, u_int16_t threa
 
     if(flow->flow_extra_info[0] != '\0') fprintf(out, "[%s]", flow->flow_extra_info);
 
+    if(flow->dns.geolocation_iata_code[0] != '\0') fprintf(out, "[GeoLocation: %s]", flow->dns.geolocation_iata_code);
+
     if((flow->src2dst_packets+flow->dst2src_packets) > 5) {
       if(flow->iat_c_to_s && flow->iat_s_to_c) {
 	float data_ratio = ndpi_data_ratio(flow->src2dst_bytes, flow->dst2src_bytes);
-- 
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