updated readme and added logging

ameshkov · Sep 14, 2023 · 5de3b07 · 5de3b07
1 parent e04ab5e
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diff --git a/README.md b/README.md
@@ -103,6 +103,18 @@ sudo sniproxy \
     --drop-rule=example.net
 ```
 
+### Drop DNS queries
+
+You may want to emulate the situation when DNS queries to specific domains are
+dropped.  Use `--dns-drop-rule` option to do this:
+
+```shell
+sudo sniproxy \
+    --dns-redirect-ipv4-to=1.2.3.4 \
+    --dns-drop-rule=example.net \
+    --dns-drop-rule=example.com
+```
+
 ### Throttle connections
 
 If you need to emulate slow network, use `bandwidth-rate` to set the desired

diff --git a/internal/dnsproxy/dnsproxy.go b/internal/dnsproxy/dnsproxy.go
@@ -92,6 +92,7 @@ func (d *DNSProxy) requestHandler(p *proxy.Proxy, ctx *proxy.DNSContext) (err er
 	if filter.MatchWildcards(domainName, d.dropRules) {
 		// Return empty response, effectively "dropping" the query.
 		ctx.Res = nil
+		log.Info("dnsproxy: dropping DNS query for %s %s", dns.Type(qType), qName)
 
 		return nil
 	}