code: private void
  findResolvConf(String file) {
  	InputStream in = null;
  	try {
  		in = new FileInputStream(file);
  	}
  	catch (FileNotFoundException e) {
  		return;
  	}
  	InputStreamReader isr = new InputStreamReader(in);
  	BufferedReader br = new BufferedReader(isr);
  	List lserver = new ArrayList(0);
  	List lsearch = new ArrayList(0);
  	try {
  		String line;
  		while ((line = br.readLine()) != null) {
  			if (line.startsWith("nameserver")) {
  				StringTokenizer st = new StringTokenizer(line);
  				st.nextToken(); /* skip nameserver */
  				addServer(st.nextToken(), lserver);
  			}
  			else if (line.startsWith("domain")) {
  				StringTokenizer st = new StringTokenizer(line);
  				st.nextToken(); /* skip domain */
  				if (!st.hasMoreTokens())
  					continue;
  				if (lsearch.isEmpty())
  					addSearch(st.nextToken(), lsearch);
  			}
  			else if (line.startsWith("search")) {
  				if (!lsearch.isEmpty())
  					lsearch.clear();
  				StringTokenizer st = new StringTokenizer(line);
  				st.nextToken(); /* skip search */
  				while (st.hasMoreTokens())
  					addSearch(st.nextToken(), lsearch);
  			}
  		}
  		br.close();
  	}
  	catch (IOException e) {
  	}
  
  	configureFromLists(lserver, lsearch);
  }
docs: Looks in /etc/resolv.conf to find servers and a search path.
  "nameserver" lines specify servers.  "domain" and "search" lines
  define the search path.