Resolv.conf 修改破壞了 DNS

這是一個奇怪的問題，但我似乎無法解決它。

我正在創建一個視覺化使用者界面來修改 Debian Wheezy（以及其他偶然兼容的 debian 版本/衍生產品）上的網際網路設置。

我希望能夠根據使用者插入的內容修改 DNS。

   

按下“保存”後，將執行此程式碼：

void SaveDNSButton_event(object obj, ButtonPressEventArgs args)
   {
       //save dns settings
       string s1 = "";
       string s2 = "";

       string toWrite = s1 + s2;
       Console.WriteLine ("=============");
       Console.WriteLine ("Reading from resolv.conf before writing...");
       using (StreamReader confReader = File.OpenText ("/etc/resolv.conf")) {
           StringReader sr = new StringReader (confReader.ReadToEnd ());
           string line;
           toWrite = "";
           while (null != (line = sr.ReadLine ())) {
               if (line.Contains ("nameserver")) {
                   Console.WriteLine (line);
               } else {
                   toWrite += line + Environment.NewLine;
               }
           }
           confReader.Dispose ();
           confReader.Close ();
       }

       s1 = "nameserver " + DNSentry1.Text + ";" + Environment.NewLine;
       s2 = "nameserver " + DNSentry2.Text + ";" +  Environment.NewLine;


       Console.WriteLine ("=============");
       Console.WriteLine ("Writing to resolv.conf");
       Console.WriteLine ("To write: " + toWrite + s1 + s2);

       using (StreamWriter confWriter = new StreamWriter ("/etc/resolv.conf", false)) {
           Console.WriteLine ("Writing...");
           confWriter.Write (toWrite + s1 + s2);
           Console.WriteLine ("Closing file stream...");
           confWriter.Dispose ();
           confWriter.Close ();
       }


       Console.WriteLine ("=============");

       Console.WriteLine ("Opening conf to confirm if it worked");
       if (IsLinux) {
           Console.WriteLine ("Trying to open conf");
           StreamReader file = File.OpenText ("/etc/resolv.conf");
           string s = file.ReadToEnd ();
           Console.WriteLine(s);

           file.Dispose ();
           file.Close ();
       }
   }

相關部分是

using (StreamWriter confWriter = new StreamWriter ("/etc/resolv.conf", false)) {
           Console.WriteLine ("Writing...");
           confWriter.Write (toWrite + s1 + s2);
           Console.WriteLine ("Closing file stream...");
           confWriter.Dispose ();
           confWriter.Close ();
       }

resolv.conf其中我用填寫的 DNS 資訊覆蓋。對此的範例輸入將類似於第一個對話框中的“8.8.8.8”和第二個對話框中的“8.8.4.4”。輸出將是…

=============
Reading from resolv.conf before writing...
nameserver 192.168.2.101
nameserver 8.8.8.8
=============
Writing to resolv.conf
To write: # Generated by NetworkManager
domain trin-it.local
search trin-it.local
nameserver 8.8.8.8;
nameserver 8.8.4.4;

Writing...
Closing file stream...
=============
Opening conf to confirm if it worked
4
Trying to open conf
# Generated by NetworkManager
domain trin-it.local
search trin-it.local
nameserver 8.8.8.8;
nameserver 8.8.4.4;

如果我在此之後 ping google，它只會顯示：“未知主機 google”

但是，如果我手動去resolv.conf那裡更改名稱伺服器，它實際上解決得很好。那是怎麼回事？/etc/resolv.conf唯一的變化是，據我所知，我是通過程式碼而不是 nano來完成的。任何人都可以對此有所了解嗎？

TL; 博士

為什麼使用程式碼編輯 resolv.conf 而不是手動編輯它？不會是一樣的吧？

在我看來，您的程式碼在名稱伺服器行的末尾添加了一個分號；不要那樣做。

引用自：https://unix.stackexchange.com/questions/208711