chore: change defaultNS of SystemDns and add log for reading system dns error

cmd/run.go

@@ -30,6 +30,7 @@ import (
 	"github.com/daeuniverse/dae/cmd/internal"
 	"github.com/daeuniverse/dae/common"
 	"github.com/daeuniverse/dae/common/consts"
+	"github.com/daeuniverse/dae/common/netutils"
 	"github.com/daeuniverse/dae/common/subscription"
 	"github.com/daeuniverse/dae/config"
 	"github.com/daeuniverse/dae/control"
@@ -249,6 +250,7 @@ loop:
 			logger.SetLogger(logrus.StandardLogger(), newConf.Global.LogLevel, disableTimestamp, nil)
 			log.SetOutput(oldLogOutput) // FIXME: THIS IS A HACK.
 			logrus.SetOutput(oldLogOutput)
+			netutils.SetLogger(log)
 
 			// New control plane.
 			obj := c.EjectBpf()

common/netutils/dns.go

@@ -59,6 +59,9 @@ func tryUpdateSystemDnsElapse(k time.Duration) (err error) {
 
 func tryUpdateSystemDns() (err error) {
 	dnsConf := dnsReadConfig("/etc/resolv.conf")
+	if dnsConf.err != nil {
+		logger.WithError(err).Warnln("dnsReadConfig(\"/etc/resolv.conf\")")
+	}
 	systemDns = netip.AddrPort{}
 	for _, s := range dnsConf.servers {
 		ipPort := netip.MustParseAddrPort(s)

common/netutils/dnsconfig_unix.go

@@ -17,6 +17,7 @@ package netutils
 
 import (
 	"bufio"
+	"fmt"
 	"net"
 	"net/netip"
 	"os"
@@ -27,7 +28,7 @@ import (
 )
 
 var (
-	defaultNS   = []string{"127.0.0.1:53", "[::1]:53"}
+	defaultNS   = []string{"119.29.29.29:53", "[2400:3200::1, 2400:3200:baba::1]:53"}
 	getHostname = os.Hostname // variable for testing
 )
 
@@ -159,6 +160,7 @@ func dnsReadConfig(filename string) *dnsConfig {
 	}
 	if len(conf.servers) == 0 {
 		conf.servers = defaultNS
+		conf.err = fmt.Errorf("no servers read")
 	}
 	if len(conf.search) == 0 {
 		conf.search = dnsDefaultSearch()

common/netutils/ip46.go

@@ -14,7 +14,6 @@ import (
 
 	"github.com/daeuniverse/outbound/netproxy"
 	dnsmessage "github.com/miekg/dns"
-	"github.com/sirupsen/logrus"
 )
 
 type Ip46 struct {
@@ -23,17 +22,13 @@ type Ip46 struct {
 }
 
 func ResolveIp46(ctx context.Context, dialer netproxy.Dialer, dns netip.AddrPort, host string, network string, race bool) (ipv46 *Ip46, err error) {
-	var log *logrus.Logger
-	if _log := ctx.Value("logger"); _log != nil {
-		log = _log.(*logrus.Logger)
-		defer func() {
-			if err == nil {
-				log.Tracef("ResolveIp46 %v using %v: A(%v) AAAA(%v)", host, systemDns, ipv46.Ip4, ipv46.Ip6)
-			} else {
-				log.Tracef("ResolveIp46 %v using %v: %v", host, systemDns, err)
-			}
-		}()
-	}
+	defer func() {
+		if err == nil {
+			logger.Tracef("ResolveIp46 %v using %v: A(%v) AAAA(%v)", host, systemDns, ipv46.Ip4, ipv46.Ip6)
+		} else {
+			logger.Tracef("ResolveIp46 %v using %v: %v", host, systemDns, err)
+		}
+	}()
 	var wg sync.WaitGroup
 	wg.Add(2)
 	var err4, err6 error

common/netutils/netutils.go

@@ -0,0 +1,16 @@
+/*
+ * SPDX-License-Identifier: AGPL-3.0-only
+ * Copyright (c) 2022-2025, daeuniverse Organization <[email protected]>
+ */
+
+package netutils
+
+import "github.com/sirupsen/logrus"
+
+var (
+	logger = logrus.StandardLogger()
+)
+
+func SetLogger(l *logrus.Logger) {
+	logger = l
+}

component/outbound/dialer/connectivity_check.go

@@ -232,7 +232,6 @@ func (c *TcpCheckOptionRaw) Option() (opt *TcpCheckOption, err error) {
 	if c.opt == nil {
 		ctx, cancel := context.WithTimeout(context.TODO(), Timeout)
 		defer cancel()
-		ctx = context.WithValue(ctx, "logger", c.Log)
 		tcpCheckOption, err := ParseTcpCheckOption(ctx, c.Raw, c.Method, c.ResolverNetwork)
 		if err != nil {
 			return nil, fmt.Errorf("failed to parse tcp_check_url: %w", err)