From 0fbfd160c9940be59f8fdcfc3ecc7d26b8cb8ecf Mon Sep 17 00:00:00 2001
From: Cuong Manh Le <cuong@windscribe.com>
Date: Fri, 24 Jan 2025 01:39:17 +0700
Subject: [PATCH] cmd/cli: log interfaces state after dns set

The data will be useful for troubleshooting later.
---
 cmd/cli/dns_proxy.go |  1 +
 cmd/cli/prog.go      | 23 +++++++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/cmd/cli/dns_proxy.go b/cmd/cli/dns_proxy.go
index 5396642..d7eb28a 100644
--- a/cmd/cli/dns_proxy.go
+++ b/cmd/cli/dns_proxy.go
@@ -1251,6 +1251,7 @@ func (p *prog) reinitializeOSResolver() {
 		mainLog.Load().Debug().Msg("setting DNS configuration")
 		p.setDNS()
 		mainLog.Load().Debug().Msg("DNS configuration set successfully")
+		p.logInterfacesState()
 	}
 }
 
diff --git a/cmd/cli/prog.go b/cmd/cli/prog.go
index 46d4d18..331f42a 100644
--- a/cmd/cli/prog.go
+++ b/cmd/cli/prog.go
@@ -273,6 +273,7 @@ func (p *prog) postRun() {
 		p.setDNS()
 		p.csSetDnsDone <- struct{}{}
 		close(p.csSetDnsDone)
+		p.logInterfacesState()
 	}
 }
 
@@ -815,6 +816,28 @@ func (p *prog) resetDNS() {
 	}
 }
 
+func (p *prog) logInterfacesState() {
+	withEachPhysicalInterfaces("", "", func(i *net.Interface) error {
+		addrs, err := i.Addrs()
+		if err != nil {
+			mainLog.Load().Warn().Str("interface", i.Name).Err(err).Msg("failed to get addresses")
+		}
+		nss, err := currentStaticDNS(i)
+		if err != nil {
+			mainLog.Load().Warn().Str("interface", i.Name).Err(err).Msg("failed to get DNS")
+		}
+		if len(nss) == 0 {
+			nss = currentDNS(i)
+		}
+		mainLog.Load().Debug().
+			Any("addrs", addrs).
+			Strs("nameservers", nss).
+			Int("index", i.Index).
+			Msgf("interface state: %s", i.Name)
+		return nil
+	})
+}
+
 // findWorkingInterface looks for a network interface with a valid IP configuration
 func findWorkingInterface(currentIface string) string {
 	// Helper to check if IP is valid (not link-local)