90 lines
1.9 KiB
Diff
90 lines
1.9 KiB
Diff
--- /net/dnsconfig_unix.go 2016-08-20 08:14:05.763235602 -0400
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+++ /net/dnsconfig_unix.go 2016-08-20 08:14:05.763235602 -0400
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@@ -9,15 +9,58 @@
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package net
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import (
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+ "fmt"
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"os"
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+ "os/exec"
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+ "strings"
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"time"
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)
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var (
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- defaultNS = []string{"127.0.0.1:53", "[::1]:53"}
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+ currentNS []string
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getHostname = os.Hostname // variable for testing
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)
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+func getDefaultNS() []string {
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+ var servers []string
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+ for _, prop := range []string{"net.dns1", "net.dns2"} {
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+ cmd := exec.Command("getprop", prop)
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+ outputBytes, err := cmd.Output()
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+ if err != nil {
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+ continue
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+ }
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+ output := strings.Trim(string(outputBytes), "\n")
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+ if ParseIP(output) != nil {
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+ servers = append(servers, output + ":53")
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+ }
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+ }
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+
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+ if len(servers) == 0 {
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+ servers = []string{"8.8.8.8:53", "8.8.4.4:53", "4.2.2.1:53"}
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+ }
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+
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+ if !slicesEqual(currentNS, servers) {
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+ fmt.Println("Using DNS servers:", servers)
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+ currentNS = servers
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+ }
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+
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+ return currentNS
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+}
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+
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+func slicesEqual(a, b []string) bool {
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+ if len(a) != len(b) {
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+ return false
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+ }
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+
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+ for i := range a {
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+ if a[i] != b[i] {
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+ return false
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+ }
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+ }
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+
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+ return true
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+}
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+
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type dnsConfig struct {
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servers []string // server addresses (in host:port form) to use
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search []string // rooted suffixes to append to local name
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@@ -40,7 +83,7 @@
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}
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file, err := open(filename)
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if err != nil {
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- conf.servers = defaultNS
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+ conf.servers = getDefaultNS()
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conf.search = dnsDefaultSearch()
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conf.err = err
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return conf
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@@ -49,7 +92,7 @@
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if fi, err := file.file.Stat(); err == nil {
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conf.mtime = fi.ModTime()
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} else {
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- conf.servers = defaultNS
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+ conf.servers = getDefaultNS()
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conf.search = dnsDefaultSearch()
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conf.err = err
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return conf
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@@ -126,7 +169,7 @@
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}
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}
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if len(conf.servers) == 0 {
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- conf.servers = defaultNS
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+ conf.servers = getDefaultNS()
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}
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if len(conf.search) == 0 {
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conf.search = dnsDefaultSearch()
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